CN112249057A - Operation control method for refrigeration mode of subway air conditioner at low temperature - Google Patents
Operation control method for refrigeration mode of subway air conditioner at low temperature Download PDFInfo
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- CN112249057A CN112249057A CN202011163945.7A CN202011163945A CN112249057A CN 112249057 A CN112249057 A CN 112249057A CN 202011163945 A CN202011163945 A CN 202011163945A CN 112249057 A CN112249057 A CN 112249057A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D27/00—Heating, cooling, ventilating, or air-conditioning
- B61D27/0072—Means for cooling only
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Abstract
The invention discloses a method for controlling the operation of a subway air conditioner in a refrigeration mode at low temperature, which belongs to the technical field of air conditioner control of railway vehicles and comprises the following steps: step A, detecting the external temperature in real time, executing step B if the external temperature is detected to be lower than 10 ℃ and the air conditioner is in a refrigeration mode, and otherwise controlling the air conditioner unit to operate according to a normal control mode; and step B, closing one constant-speed condensing fan or two-speed condensing fan of the two constant-speed condensing fans to operate at a low speed, and closing one constant-frequency compressor or variable-frequency compressor of the two constant-frequency compressors to operate at a low frequency. The method of the invention is adopted to carry out on-off control and allocation on the operation of the compressor and the condensing fan in time according to the change of the system pressure on the basis of not increasing components and auxiliary equipment; the system has the advantages of ensuring safe and reliable operation of the system, not damaging a refrigerating system and parts, and meeting the refrigerating requirement of comfort.
Description
Technical Field
The invention belongs to the technical field of air conditioner control of railway vehicles, and particularly relates to an operation control method of a subway air conditioner in a refrigeration mode at low temperature.
Background
According to the normal operation range of the air conditioning system, under the condition that the external temperature is higher, the air conditioning system operates and refrigerates to control the internal temperature at a certain comfortable refrigerating temperature. However, although the outside temperature is sometimes low, because many passengers are in the vehicle cabin, the heat dissipation capacity of the passengers is large, and the air conditioner is still needed to cool the interior of the vehicle, so that the comfort of the passengers in the vehicle cabin is ensured.
When the external temperature is low, the suction temperature is reduced, and if refrigeration is carried out, the evaporator is easy to freeze, the system pressure is too low, and the compressor can be damaged. Therefore, in many cases, when the external temperature of the air conditioner is low, all fresh air is usually started to make the external cold air enter the vehicle so as to achieve the purpose of cooling. However, this method is limited by the fresh air inlet and the fresh air volume, the air volume is reduced, the cooling rate is slow, and sometimes a satisfactory cooling effect cannot be achieved.
Disclosure of Invention
The invention aims to solve the problems of poor cooling effect caused by freezing of an evaporator and low system pressure when the external temperature is low in the prior art, and provides an operation control method of a low-temperature refrigeration mode of a subway air conditioner.
In order to solve the technical problems, the invention adopts the technical scheme that:
the operation control method of the low-temperature refrigeration mode of the subway air conditioner is based on an air conditioning unit with two constant-speed condensing fans or a double-speed condensing fan, two constant-frequency compressors or a variable-frequency compressor, and is characterized by comprising the following steps of:
step A, detecting the external temperature in real time, executing step B if the external temperature is detected to be lower than 10 ℃ and the air conditioning unit is in a refrigeration mode, and otherwise controlling the air conditioning unit to operate according to a non-low-temperature refrigeration mode;
and step B, closing one constant-speed condensing fan of the two constant-speed condensing fans or controlling the two-speed condensing fan to run at a low speed, and closing one constant-frequency compressor of the two constant-frequency compressors or controlling the variable-frequency compressor to run at a low frequency.
The method of the invention can be used for controlling and allocating the operation of the compressor and the condensing fan on and off in time according to the change of the system pressure on the basis of not increasing components and auxiliary equipment. The system has the advantages of ensuring safe and reliable operation of the system, not damaging a refrigerating system and parts, and meeting the refrigerating requirement of comfort.
The present invention will be described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural view of an air conditioning unit adopting the operation control method of the subway air conditioner in the low-temperature refrigeration mode of the invention.
In the drawings: 1 is a fixed-frequency compressor, 2 is a condenser, 3 is a fixed-speed condensing fan, 4 is a high-pressure sensor, 5 is an air suction pressure sensor, 6 is an evaporator, 7 is an evaporating fan, and 8 is an adjusting electromagnetic valve.
Detailed Description
The invention provides an operation control method of a subway air conditioner in a low-temperature refrigeration mode, which is based on an air conditioning unit with two constant-speed condensing fans or a double-speed condensing fan, two constant-frequency compressors or a variable-frequency compressor. The air conditioning unit can be any one of four air conditioning units comprising two constant-speed condensing fans and two constant-frequency compressors, two constant-speed condensing fans and one variable-frequency compressor, one double-speed condensing fan and two constant-frequency compressors, and one double-speed condensing fan and one variable-frequency compressor.
The method of the invention comprises the following steps:
step A, detecting the external temperature in real time, executing step B if the external temperature is detected to be lower than 10 ℃ and the air conditioning unit is in a refrigeration mode, and otherwise controlling the air conditioning unit to operate according to a non-low-temperature refrigeration mode;
and step B, closing one constant-speed condensing fan of the two constant-speed condensing fans or controlling the two-speed condensing fan to run at a low speed, and closing one constant-frequency compressor of the two constant-frequency compressors or controlling the variable-frequency compressor to run at a low frequency.
Detecting the suction pressure of the compressor in real time when executing the step B, opening the regulating electromagnetic valve (increasing the evaporation area and increasing the evaporation pressure) when detecting that the suction pressure is lower than the gauge pressure a (at which the evaporator can not frost or even freeze for the evaporation temperature higher than 0 ℃) and lasting for more than 1 minute; when the suction pressure is detected to be higher than the gauge pressure b (on the basis of the pressure value of the gauge pressure a, a safety margin is considered, and damage caused by frequent starting and stopping of the adjusting electromagnetic valve is avoided), the adjusting electromagnetic valve is immediately closed (evaporation area is reduced, refrigerating capacity is reduced, and excessive indoor temperature reduction is prevented), and when the suction pressure is detected to be between the pressure a and the pressure b, the adjusting electromagnetic valve is kept in an original state (namely, the adjusting electromagnetic valve is kept in an open state originally and kept in a closed state originally). Wherein a < b and a is any value of 0.3-0.4Mpag, b is any value of 0.35-0.45 Mpag, and the regulating electromagnetic valve for regulating the refrigerating capacity and the evaporating temperature is arranged on the liquid pipe branch of the air conditioning unit.
Detecting the high-pressure of the compressor in real time when the step B is executed, and when the high-pressure is reduced to gauge pressure d (considering the compression ratio of the compressor in operation and the low-pressure operation of the compressor at the moment is above the freezing point), stopping the operation of one constant-speed condensing fan or two-speed condensing fan in low-speed operation, and operating one constant-speed compressor or adopting the low-frequency operation of a variable-frequency compressor; when the high pressure returns to be higher than the gauge pressure e (after the condensing fan is closed, the high pressure rises, and the safe high pressure value is used for preventing the compressor from being stopped due to the action of the pressure protection switch when the high pressure rises), the constant-speed condensing fan is operated again or the double-speed condensing fan returns to be operated at a low speed, and the operation mode of the compressor is kept unchanged. Wherein d is any one of 1.3-1.4 Mpag, and e is any one of 2.5-2.6 Mpag.
The two steps of detecting the suction pressure and the high pressure of the compressor in real time are independently controlled, and do not influence each other.
The technical measure is a first-stage anti-frosting mode, and if the anti-frosting mode fails, a second-stage anti-frosting mode is executed, namely: if the suction pressure of the compressor lasts for 5 minutes simultaneously between the gauge pressure c and the gauge pressure a, the running compressor is stopped for 10 minutes, the regulating electromagnetic valve is closed, the ventilator runs in a ventilation state, one of the two fixed-frequency compressors returns to run or the inverter compressor returns to run at low frequency and counts again, and if the suction pressure of the compressor is detected to last for 5 minutes simultaneously between the gauge pressure c and the gauge pressure a again, the operation is repeated until the suction pressure of the compressor rises to the gauge pressure b; if the suction pressure of the compressor is lower than the gauge pressure c, the compressor is stopped, the ventilator runs in a ventilation state, only after the air conditioning system is restarted, the compressor can judge whether to be restarted or not according to the current situation, after the compressor is restarted, if the suction pressure is increased to the gauge pressure b, the regulating electromagnetic valve is closed, one constant-speed condensing fan of the two constant-speed condensing fans runs or the two-speed condensing fan runs at a low speed, one constant-frequency compressor of the two constant-frequency compressors runs or the variable-frequency compressor runs at a low frequency. Wherein c < a, c is any one of 0.15-0.25 Mpag.
When the air conditioning unit is controlled to operate according to a non-low-temperature refrigeration mode, according to the comparison between the indoor and outdoor temperature and the indoor required temperature, the two fixed-frequency condensing fans or the two-speed condensing fans and the ventilator work at normal frequency, and one or two fixed-frequency compressors or the variable-frequency compressor operates to regulate the frequency.
In the present invention, the values of a, b, c, d, and e can be arbitrarily selected within respective ranges according to the system conditions.
The control method of the present invention will be described in detail with reference to specific examples.
Referring to the drawings, the air conditioning unit of the embodiment has two constant-speed condensing fans 3, two constant-frequency compressors 1 and two condensers 2, two evaporators 6 and one evaporating fan 7 which are matched with the constant-speed condensing fans. A regulating electromagnetic valve 8 (regulating refrigerating capacity and evaporating temperature) is arranged on a branch pipeline of a liquid pipe of the system; a high-pressure sensor 4 and a suction pressure sensor 5 are respectively arranged at the exhaust pipe and the suction pipe of the compressor and used for collecting pressure values; the refrigerant is R407C (for other refrigerant systems, appropriate pressure values are defined depending on the corresponding refrigerant freezing point temperature).
And when the air conditioning unit operates, if the detected external temperature is lower than 10 ℃ and the air conditioning unit is in a refrigeration mode, executing two-stage anti-frosting technical measures, otherwise, controlling the air conditioning unit to operate according to a non-low-temperature refrigeration mode.
The first-level anti-frosting technical measures are as follows:
and closing one constant-speed condensing fan 3 of the two constant-speed condensing fans and closing one constant-frequency compressor 1 of the two constant-frequency compressors.
Detecting the suction pressure of the compressor in real time, and opening the regulating electromagnetic valve 8 when the suction pressure is detected to be lower than the gauge pressure a (taking 0.3 Mpag) and lasts for more than 1 minute, so as to increase the evaporation area, increase the evaporation temperature and prevent the evaporator 6 from frosting or even freezing; when the suction pressure is detected to be higher than the gauge pressure b (taking 0.4 Mpag), the regulating electromagnetic valve 8 is immediately closed, the evaporation area is reduced, the refrigerating capacity is reduced, and the indoor temperature reduction is prevented from being too fast.
Detecting the high pressure of the compressor in real time, and when the high pressure is reduced to gauge pressure d (1.4 Mpag), stopping the operation of one constant-speed condensing fan 3 in operation and stopping the operation of one constant-frequency compressor 1 in operation; when the high pressure returns to a value higher than the gauge pressure e (2.6 Mpag), a constant-speed condensing fan 3 is operated again.
The two steps of detecting the suction pressure and the high pressure of the compressor in real time are controlled independently and do not influence each other.
The technical measure is a first-stage anti-frosting mode, and if the anti-frosting mode fails, a second-stage anti-frosting mode is executed, namely: if the suction pressure of the compressor is between the gauge pressure c (0.2 MPag) and the gauge pressure a and continues for 5 minutes, the running compressor is stopped for 10 minutes and the regulating electromagnetic valve 8 is closed, the ventilator operates in a ventilation state, then the compressor continues to operate, the timer is restarted, if the suction pressure of the compressor is between the gauge pressure c and the gauge pressure a and continues for 5 minutes, the compressor is stopped for 10 minutes again, and the process is repeated (the ventilator is operated all the time in the process); if the suction pressure of the compressor is lower than the gauge pressure c, the compressor is stopped, the ventilator runs in a ventilation state, and the compressor can judge whether to be started again according to the current situation only after the air conditioner is restarted. After the compressor is restarted, if the suction pressure is increased to the gauge pressure b, the regulating electromagnetic valve 8 is closed, one fixed-speed condensing fan 3 of the two fixed-speed condensing fans operates, and one fixed-frequency compressor 1 of the two fixed-frequency compressors operates.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (5)
1. The operation control method of the low-temperature refrigeration mode of the subway air conditioner is based on an air conditioning unit with two constant-speed condensing fans or a double-speed condensing fan, two constant-frequency compressors or a variable-frequency compressor, and is characterized by comprising the following steps of:
step A, detecting the external temperature in real time, executing step B if the external temperature is detected to be lower than 10 ℃ and the air conditioning unit is in a refrigeration mode, and otherwise controlling the air conditioning unit to operate according to a non-low-temperature refrigeration mode;
and step B, closing one constant-speed condensing fan of the two constant-speed condensing fans or controlling the two-speed condensing fan to run at a low speed, and closing one constant-frequency compressor of the two constant-frequency compressors or controlling the variable-frequency compressor to run at a low frequency.
2. A method of controlling an operation of a cooling mode at a low temperature of a subway air conditioner according to claim 1, wherein a suction pressure of the compressor is detected in real time while performing the step B, and the adjusting solenoid valve is turned on when the suction pressure is detected to be lower than the gauge pressure a and continued for 1 minute or more; when the suction pressure is detected to be higher than the gauge pressure b, the regulating electromagnetic valve is immediately closed, when the suction pressure is detected to be between a and b, the regulating electromagnetic valve is kept in the original state, wherein a < b and a is any value of 0.3-0.4Mpag, and b is any value of 0.35-0.45 Mpag, and the regulating electromagnetic valve is arranged on a liquid pipe branch line of the air conditioning unit.
3. A method of controlling an operation of a cooling mode of a subway air conditioner at a low temperature according to claim 2, wherein if the suction pressure of the compressor is maintained between the gage pressure c and the gage pressure a for 5 minutes at the same time when the step B is performed, the compressor being operated is stopped for 10 minutes and the adjusting solenoid valve is turned off, the ventilating fan is operated in a ventilating state, and then one of the two fixed frequency compressors is resumed to be operated or the inverter compressor resumes to be operated at a low frequency and is restarted, and if it is detected again that the suction pressure of the compressor is maintained between the gage pressure c and the gage pressure a for 5 minutes at the same time, the above operation is repeated until the suction pressure of the compressor is increased to the gage pressure B; the compressor is stopped if the suction pressure of the compressor is below the gauge pressure c and the ventilator is operated in a ventilation state wherein c < a, c is any one of 0.15-0.25 Mpag.
4. A method for controlling the operation of a cooling mode of a subway air conditioner at a low temperature as claimed in claim 1, wherein a high pressure of the compressor is detected in real time when the step B is performed, and when the high pressure is reduced to a gage pressure d, one constant speed condensing fan or a two-speed condensing fan operating at a low speed in operation is stopped, and one constant speed compressor or a variable frequency compressor is operated at a low frequency; when the high pressure returns to be higher than the gauge pressure e, a constant speed condensing fan is operated again or a two-speed condensing fan returns to be operated at a low speed, and the operation mode of the compressor is kept unchanged, wherein d is any value from 1.3 to 1.4Mpag, and e is any value from 2.5 to 2.6 Mpag.
5. A method for controlling the operation of an air conditioning unit in a low-temperature refrigeration mode according to any one of claims 1 to 4, wherein when the air conditioning unit is controlled to operate in a non-low-temperature refrigeration mode, the two constant-frequency or two-speed condensing fans and the ventilator operate at normal frequencies, and the two constant-frequency compressors operate at one or both or the variable-frequency compressors operate at a frequency adjusted operation, according to the comparison between the indoor and outdoor temperatures and the indoor required temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011163945.7A CN112249057B (en) | 2020-10-27 | 2020-10-27 | Operation control method for refrigeration mode of subway air conditioner at low temperature |
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| CN202011163945.7A CN112249057B (en) | 2020-10-27 | 2020-10-27 | Operation control method for refrigeration mode of subway air conditioner at low temperature |
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| CN112249057B CN112249057B (en) | 2021-10-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112984713A (en) * | 2021-03-03 | 2021-06-18 | 青岛海信电子设备股份有限公司 | Multi-compressor control method and air conditioning unit |
| CN113357785A (en) * | 2021-06-10 | 2021-09-07 | 威海广泰空港设备股份有限公司 | Low-temperature operation control method for aircraft ground air-conditioning refrigeration system |
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| JP2020073854A (en) * | 2020-02-06 | 2020-05-14 | 三菱電機株式会社 | Refrigeration cycle device |
| CN111219840A (en) * | 2019-11-27 | 2020-06-02 | 珠海格力电器股份有限公司 | Ultralow-temperature refrigeration control method and device and air conditioning equipment |
| CN111780333A (en) * | 2020-07-14 | 2020-10-16 | 珠海格力电器股份有限公司 | Control method and device of air conditioner and air conditioner equipment |
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2020
- 2020-10-27 CN CN202011163945.7A patent/CN112249057B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010078272A (en) * | 2008-09-29 | 2010-04-08 | Sanyo Electric Co Ltd | Air-conditioning and refrigerating system |
| CN103115417A (en) * | 2013-03-19 | 2013-05-22 | 海尔集团公司 | Refrigeration method of low temperature environment air conditioner |
| CN105627496A (en) * | 2014-10-29 | 2016-06-01 | 青岛海尔空调器有限总公司 | Low-temperature refrigerating control method of air conditioner and air conditioner |
| CN111219840A (en) * | 2019-11-27 | 2020-06-02 | 珠海格力电器股份有限公司 | Ultralow-temperature refrigeration control method and device and air conditioning equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112984713A (en) * | 2021-03-03 | 2021-06-18 | 青岛海信电子设备股份有限公司 | Multi-compressor control method and air conditioning unit |
| CN113357785A (en) * | 2021-06-10 | 2021-09-07 | 威海广泰空港设备股份有限公司 | Low-temperature operation control method for aircraft ground air-conditioning refrigeration system |
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| CN112249057B (en) | 2021-10-22 |
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