CN112178978B - Protection control method for overhigh exhaust temperature of variable frequency heat pump - Google Patents
Protection control method for overhigh exhaust temperature of variable frequency heat pump Download PDFInfo
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- CN112178978B CN112178978B CN202011104934.1A CN202011104934A CN112178978B CN 112178978 B CN112178978 B CN 112178978B CN 202011104934 A CN202011104934 A CN 202011104934A CN 112178978 B CN112178978 B CN 112178978B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000000630 rising effect Effects 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 abstract description 7
- 230000007423 decrease Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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- 238000005192 partition Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
Abstract
The invention discloses a protection control method for overhigh exhaust temperature of a variable frequency heat pump, which is used for the variable frequency heat pump unit, wherein when the exhaust temperature is detected to be in a temperature section of a frequency slow-rise region, if the frequency modulation control of a compressor is in a frequency rise, the frequency rise rate is 1HZ raised every 30S; if the compressor is in the frequency reduction or stable frequency, the frequency is kept unchanged; when the exhaust temperature is lower than the temperature section of the frequency gradual rising area, the frequency control rate of the compressor is recovered to the normal rate; when the exhaust temperature is detected to be in a stable frequency reduction zone temperature section, detecting the exhaust temperature once every 30S, and if the exhaust temperature rises to be more than or equal to 2 ℃ every 30S, reducing the frequency; if the exhaust temperature rises to be less than 2 ℃ every 30S or the exhaust temperature does not rise, the frequency is unchanged; and when the exhaust temperature is detected to be in the temperature section of the rapid frequency reduction zone, frequency reduction is carried out. The invention adopts the sectional control of the exhaust temperature, and simultaneously controls the frequency regulation of the compressor and the regulation of the electronic expansion valve, thereby quickly controlling the exhaust temperature in a safe range and ensuring the pressure balance of the system.
Description
Technical Field
The patent belongs to the field of heat pump control, and relates to a protection control method for overhigh exhaust temperature of a variable frequency heat pump.
Background
When the exhaust temperature is higher than the safe temperature, the traditional heat pump control carries out protection by frequency reduction or stopping, the frequency is repeatedly shaped, the pressure change of the system is large, the control stability is poor, the energy efficiency is poor, and the risks of protection lag and damage of a compressor are easy to occur; the traditional technology does not carry out frequency partition control according to different exhaust temperature ranges, when the exhaust temperature is high, the frequency is quickly reduced, the exhaust temperature is quickly reduced, after the exhaust frequency reduction is quitted, the exhaust temperature is quickly increased, the frequency and the exhaust temperature continuously fluctuate, the system stability is poor, and the energy efficiency is poor; in the prior art, when the exhaust temperature is high, the electronic expansion valve is periodically opened until the exhaust temperature is reduced to a certain range, the stable exhaust temperature of the system cannot be maintained according to the system load requirement, the control of the electronic expansion valve and the control of the frequency of the compressor are not coordinated, and the system pressure is unstable.
The present invention has been made to solve the above problems.
Disclosure of Invention
The invention aims to provide a protection control method for overhigh exhaust temperature of a variable frequency heat pump.
The purpose of the invention is realized by the following technical scheme:
a protection control method for overhigh exhaust temperature of a variable frequency heat pump comprises the following steps: s1, collecting the exhaust temperature of the compressor when the variable frequency heat pump unit is in the running state, and turning to S2;
s2, judging whether the exhaust temperature is in the temperature section of the frequency gradual rising area, if so, turning to S3, and if not, turning to S6;
s3, judging whether the frequency modulation control of the compressor is in the frequency increasing state, if so, turning to S4, if not, turning to S5;
s4, reducing the frequency increasing rate to increase 1HZ every 30S;
s5, keeping the original frequency reduction or stable frequency unchanged;
s6, judging whether the exhaust temperature is lower than the temperature section of the frequency gradual rising area, if so, turning to S8, and if not, turning to S7;
s7, judging whether the exhaust temperature is lower than the temperature section of the stable frequency reduction zone, if so, turning to S9, and if not, turning to S15;
s8, restoring the frequency control rate of the compressor to the normal rate;
s9, detecting the exhaust temperature once every 30S, and turning to S10;
s10, judging whether the exhaust temperature is equal to the lowest temperature of the temperature section of the stable frequency reduction zone minus 5 ℃, if so, turning to S13, and if not, turning to S11;
s11, judging whether the exhaust temperature rises to 2 ℃ or more every 30S, if so, turning to S12, and if not, turning to S14;
s12, reducing the frequency of the compressor to 2HZ, and turning to S9;
s13, exiting the exhaust stabilization frequency reduction control;
s14, keeping the frequency of the compressor unchanged, and turning to S9;
s15, judging whether the exhaust temperature is in the temperature section of the rapid frequency reduction zone, if so, turning to S16, and if not, turning to S17;
s16, the compressor reduces the frequency by 5HZ, and then the S18 is carried out;
s17, quitting the fast frequency reduction;
s18, detecting the exhaust temperature once every 30S, and turning to S15;
s19, judging whether the exhaust temperature is higher than 120 ℃, if so, turning to S20;
and S20, shutdown protection.
Preferably, the temperature section of the frequency gradual rising zone is 90-100 ℃; the temperature section of the stable frequency reduction zone is 100-110 ℃; the temperature section of the rapid frequency reduction zone is 110-118 ℃.
Further, the control method of the electronic expansion valve comprises the following steps: when the exhaust temperature is more than or equal to 105 ℃, the opening of the electronic expansion valve is increased by delta P1Step (2); starting timing, detecting the exhaust temperature every 15S, and judging the change value delta T of the exhaust temperature; when the exhaust temperature is less than or equal to 100 ℃, the electronic expansion valve recovers normal control.
Preferably, if the delta T is less than-1 ℃, the electronic expansion valve is opened by a large delta P2And reducing the exhaust temperature detection period to be detected every 5S.
Preferably, if the temperature is between 1 and 0 ℃ and the delta T is less than 0 ℃, the opening of the electronic expansion valve is larger by delta P3And reducing the exhaust temperature detection period to be detected every 10S.
Preferably, if the temperature is more than or equal to 0 and less than or equal to delta T and less than 1 ℃, the opening of the electronic expansion valve is larger than delta P4And (5) carrying out the steps.
Preferably, if the temperature is more than or equal to 1 and less than or equal to 2 ℃, the opening of the electronic expansion valve is more than or equal to delta P5And (5) carrying out the steps.
Preferably, if Δ T > 2 ℃, the electronic expansion valve opening remains unchanged.
Preferably,. DELTA.P1Is 16, Δ P2Is 16, Δ P3Is 12, Δ P4Is 8, Δ P5Is 4.
The invention has the beneficial effects that:
1. the invention carries out frequency zone control according to different exhaust temperature ranges, when exhaust enters a high-temperature stage, the exhaust slowly increases the frequency in a segmented manner, slowly decreases the frequency and rapidly decreases the frequency, can well solve the problem of reaction lag of the exhaust temperature of the system, and maintains the exhaust temperature and the frequency stability of the compressor according to the operation condition and the load requirement of the system.
2. According to the invention, the opening and the regulation period of the electronic expansion valve are dynamically controlled according to the dual dimensions of the exhaust temperature and the exhaust temperature rising rate, the exhaust temperature is stabilized in a proper range according to the system load, the frequency regulation of the electronic expansion valve and the compressor is coordinated, the system pressure is stable, and the energy efficiency is high.
3. The exhaust temperature is controlled in a segmented mode, the frequency of the compressor is adjusted, the electronic expansion valve is adjusted and controlled simultaneously, the exhaust temperature can be controlled within a safety range well, the exhaust temperature can be guaranteed to be stable within a range required by energy efficiency, the system is guaranteed to control pressure balance, and the system is safe, stable and high in energy efficiency.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of a protection control method for the exhaust temperature of the variable frequency heat pump of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A protection control method for overhigh exhaust temperature of a variable-frequency heat pump is used for the variable-frequency heat pump unit, the variable-frequency heat pump unit comprises a compressor, and the control method comprises the following steps: when the variable frequency heat pump unit is in an operating state, collecting the exhaust temperature of a compressor; when the exhaust temperature of the heat pump unit is too high in operation, the exhaust temperature is stabilized in a proper range by carrying out compressor frequency adjustment and electronic expansion valve adjustment through temperature division, so that the safety of the heat pump unit is ensured, and the heat pump unit has higher energy efficiency; in the control process, the frequency adjustment of the compressor and the adjustment and control of the electronic expansion valve are carried out simultaneously without mutual interference.
When the exhaust temperature is detected to be in the temperature section of the frequency gradual rising area, if the frequency modulation control of the compressor is in the frequency rising, the compressor is controlled to slowly rise the frequency, and the frequency rising rate is increased by 5HZ from every 30S and is reduced to 1HZ from every 30S; if the compressor is in the frequency reduction or stable frequency, the frequency is kept unchanged; when the exhaust temperature is lower than the temperature section of the frequency gradual rising area, the frequency control speed of the compressor is recovered to the normal speed.
When the exhaust temperature is detected to be in a stable frequency reduction zone temperature section, the compressor is controlled to perform stable frequency reduction, the exhaust temperature is detected every 30 seconds, and if the exhaust temperature rises to be more than or equal to 2 ℃ every 30 seconds, the compressor is controlled to reduce the frequency by 2 HZ; if the exhaust temperature rises to be less than 2 ℃ every 30 seconds or the exhaust temperature does not rise, keeping the frequency unchanged; and when the exhaust temperature is reduced to the temperature which is 5 ℃ lower than the lowest temperature of the temperature section of the stable frequency reduction region, the exhaust stable frequency reduction control is quitted.
When the exhaust temperature is detected to be in the temperature section of the rapid frequency reduction zone, the compressor performs rapid frequency reduction control, the frequency is immediately reduced by 5HZ, the exhaust temperature is detected once every 30S, if the exhaust temperature is in the temperature section of the rapid frequency reduction zone, the frequency is reduced by 5HZ, and the rapid frequency reduction is stopped until the exhaust temperature exits the temperature section of the rapid frequency reduction zone.
The invention carries out frequency zone control according to different exhaust temperature ranges, when exhaust enters a high-temperature stage, the exhaust slowly increases the frequency in a segmented manner, slowly decreases the frequency and rapidly decreases the frequency, can well solve the problem of reaction lag of the exhaust temperature of the system, and maintains the exhaust temperature and the frequency stability of the compressor according to the operation condition and the load requirement of the system.
Referring to fig. 1, the specific control steps are as follows:
s1, collecting the exhaust temperature of the compressor when the variable frequency heat pump unit is in the running state, and turning to S2;
s2, judging whether the exhaust temperature is in the temperature section of the frequency gradual rising area, if so, turning to S3, and if not, turning to S6;
s3, judging whether the frequency modulation control of the compressor is in the frequency increasing state, if so, turning to S4, if not, turning to S5;
s4, reducing the frequency increasing rate to increase 1HZ every 30S;
s5, keeping the original frequency reduction or stable frequency unchanged;
s6, judging whether the exhaust temperature is lower than the temperature section of the frequency gradual rising area, if so, turning to S8, and if not, turning to S7;
s7, judging whether the exhaust temperature is lower than the temperature section of the stable frequency reduction zone, if so, turning to S9, and if not, turning to S15;
s8, restoring the frequency control rate of the compressor to the normal rate;
s9, detecting the exhaust temperature once every 30S, and turning to S10;
s10, judging whether the exhaust temperature is equal to the lowest temperature of the temperature section of the stable frequency reduction zone minus 5 ℃, if so, turning to S13, and if not, turning to S11;
s11, judging whether the exhaust temperature rises to 2 ℃ or more every 30S, if so, turning to S12, and if not, turning to S14;
s12, reducing the frequency of the compressor to 2HZ, and turning to S9;
s13, exiting the exhaust stabilization frequency reduction control;
s14, keeping the frequency of the compressor unchanged, and turning to S9;
s15, judging whether the exhaust temperature is in the temperature section of the rapid frequency reduction zone, if so, turning to S16, and if not, turning to S17;
s16, the compressor reduces the frequency by 5HZ, and then the S18 is carried out;
s17, quitting the fast frequency reduction;
s18, detecting the exhaust temperature once every 30S, and turning to S15;
s19, judging whether the exhaust temperature is higher than 120 ℃, if so, turning to S20;
and S20, shutdown protection.
According to different exhaust temperature ranges and the frequency regulation logic of the compressor, the exhaust temperature range is divided into a frequency slow-rise area temperature section, a stable frequency reduction area temperature section and a rapid frequency reduction area temperature section; the temperature section of the frequency slow-rising area is 90-100 ℃; the temperature section of the stable frequency reduction zone is 100-110 ℃; the temperature section of the rapid frequency reduction zone is 110 ℃ and 118 ℃, and the person skilled in the art can adjust the temperature according to the model.
Example 2
Further, the control method of the electronic expansion valve comprises the following steps: when the exhaust temperature is more than or equal to 105 ℃, the electronic expansion valve enters high exhaust control logic, and the opening of the electronic expansion valve is increased by delta P1Step (2); start timing, detect one every 15SSecondary exhaust temperature, and judging the change value delta T of the exhaust temperature; when the exhaust temperature is less than or equal to 100 ℃, the control of the high-exhaust electronic expansion valve is quitted, and the electronic expansion valve is recovered to be in normal control; Δ T is the last exhaust temperature — the current exhaust temperature.
If the delta T is less than-1 ℃, the opening of the electronic expansion valve is larger by delta P2Step, the exhaust temperature detection period is reduced to once every 5S; if delta T is more than or equal to-1 and less than 0 ℃, the opening of the electronic expansion valve is large delta P3Step, the exhaust temperature detection period is reduced to once every 10S; if delta T is more than or equal to 0 and less than 1 ℃, the opening of the electronic expansion valve is large delta P4Step (2); if delta T is more than or equal to 1 and less than or equal to 2 ℃, the opening of the electronic expansion valve is large delta P5Step (2); if the delta T is more than 2 ℃, the opening of the electronic expansion valve is kept unchanged.
Specifically,. DELTA.P1Is 16, Δ P2Is 16, Δ P3Is 12, Δ P4Is 8, Δ P5Is 4.
Through adopting exhaust temperature segmentation control, compressor frequency regulation and electronic expansion valve regulation simultaneous control, can be fine with exhaust temperature rapid control in the safety range to guarantee that exhaust temperature can be stabilized in the efficiency requires the within range, guarantee system control pressure balance, safety and stability, the efficiency is high.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The method for protecting and controlling the exhaust temperature of the variable frequency heat pump from being too high is characterized by comprising the following steps of: s1, collecting the exhaust temperature of the compressor when the variable frequency heat pump unit is in the running state, and turning to S2;
s2, judging whether the exhaust temperature is in the temperature section of the frequency gradual rising area, if so, turning to S3, and if not, turning to S6;
s3, judging whether the frequency modulation control of the compressor is in the frequency increasing state, if so, turning to S4, if not, turning to S5;
s4, reducing the frequency increasing rate to increase 1HZ every 30S;
s5, keeping the original frequency reduction or stable frequency unchanged;
s6, judging whether the exhaust temperature is lower than the temperature section of the frequency gradual rising area, if so, turning to S8, and if not, turning to S7;
s7, judging whether the exhaust temperature is lower than the temperature section of the stable frequency reduction zone, if so, turning to S9, and if not, turning to S15;
s8, restoring the frequency control rate of the compressor to the normal rate;
s9, detecting the exhaust temperature once every 30S, and turning to S10;
s10, judging whether the exhaust temperature is equal to the lowest temperature of the temperature section of the stable frequency reduction zone minus 5 ℃, if so, turning to S13, and if not, turning to S11;
s11, judging whether the exhaust temperature rises to 2 ℃ or more every 30S, if so, turning to S12, and if not, turning to S14;
s12, reducing the frequency of the compressor to 2HZ, and turning to S9;
s13, exiting the exhaust stabilization frequency reduction control;
s14, keeping the frequency of the compressor unchanged, and turning to S9;
s15, judging whether the exhaust temperature is in the temperature section of the rapid frequency reduction zone, if so, turning to S16, and if not, turning to S17;
s16, the compressor reduces the frequency by 5HZ, and then the S18 is carried out;
s17, quitting the fast frequency reduction;
s18, detecting the exhaust temperature once every 30S, and turning to S15;
s19, judging whether the exhaust temperature is higher than 120 ℃, if so, turning to S20;
and S20, shutdown protection.
2. The method for protecting and controlling the exhaust temperature of the variable-frequency heat pump to be overhigh according to the claim 1, characterized in that the temperature section of the frequency gradual rising zone is 90-100 ℃; the temperature section of the stable frequency reduction zone is 100-110 ℃; the temperature section of the rapid frequency reduction zone is 110-118 ℃.
3. The method for protecting and controlling the exhaust temperature of the inverter heat pump from being too high according to claim 1, further comprising an electronic expansion valve control method, wherein the electronic expansion valve control method comprises the following steps: when the exhaust temperature is more than or equal to 105 ℃, the opening of the electronic expansion valve is increased by delta P1Step (2); starting timing, detecting the exhaust temperature every 15S, and judging the change value delta T of the exhaust temperature; when the exhaust temperature is less than or equal to 100 ℃, the electronic expansion valve recovers normal control.
4. The method for protecting and controlling the exhaust temperature of the inverter heat pump from being too high according to claim 3,
if the delta T is less than-1 ℃, the opening of the electronic expansion valve is larger by delta P2And reducing the exhaust temperature detection period to be detected every 5S.
5. The method for protecting and controlling the exhaust temperature of the inverter heat pump from being too high according to claim 3,
if delta T is more than or equal to-1 and less than 0 ℃, the opening of the electronic expansion valve is large delta P3And reducing the exhaust temperature detection period to be detected every 10S.
6. The variable frequency heat pump discharge temperature of claim 3The over-high protection control method is characterized in that if delta T is more than or equal to 0 and less than 1 ℃, the opening of the electronic expansion valve is larger by delta P4And (5) carrying out the steps.
7. The method for protecting and controlling the exhaust temperature of the variable-frequency heat pump from being too high as claimed in claim 3, wherein if Δ T is greater than or equal to 1 and less than or equal to 2 ℃, the opening of the electronic expansion valve is greater than Δ P5And (5) carrying out the steps.
8. The method for protecting and controlling the exhaust temperature of the variable-frequency heat pump from being too high according to claim 3, wherein if Δ T is greater than 2 ℃, the opening degree of the electronic expansion valve is kept unchanged.
9. The method for protecting and controlling the exhaust temperature of the inverter heat pump from being too high as claimed in claim 5, wherein Δ P is1Is 16, Δ P2Is 16, Δ P3Is 12, Δ P4Is 8, Δ P5Is 4.
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| CN113218114B (en) * | 2021-06-04 | 2022-03-15 | 江苏拓米洛环境试验设备有限公司 | Control method of electronic expansion valve |
| CN113758048B (en) * | 2021-08-12 | 2024-04-19 | 深圳市派沃新能源科技股份有限公司 | Air source heat pump low temperature protection system |
| CN113654226B (en) * | 2021-08-13 | 2023-02-17 | 青岛海尔空调器有限总公司 | Method and device for controlling frequency stability of air conditioner compressor and electronic equipment |
| CN113639453B (en) * | 2021-08-13 | 2023-02-17 | 青岛海尔空调器有限总公司 | Method and device for controlling frequency stability of air conditioner compressor and electronic equipment |
| CN113757903B (en) * | 2021-08-24 | 2023-02-10 | 宁波奥克斯电气股份有限公司 | Air conditioner starting control method, air conditioner starting control device and air conditioner |
| CN115978750A (en) * | 2021-10-15 | 2023-04-18 | 广东美的制冷设备有限公司 | Air conditioner, control method thereof, and computer-readable storage medium |
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| JP2004347148A (en) * | 2003-05-20 | 2004-12-09 | Matsushita Electric Ind Co Ltd | Heat pump hot water supply device |
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| JP6037794B2 (en) * | 2012-11-21 | 2016-12-07 | 三菱重工業株式会社 | Refrigeration / air conditioner and control method of refrigeration / air conditioner |
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