CN106288567B - Central air-conditioning starts control method - Google Patents
Central air-conditioning starts control method Download PDFInfo
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- CN106288567B CN106288567B CN201510290330.3A CN201510290330A CN106288567B CN 106288567 B CN106288567 B CN 106288567B CN 201510290330 A CN201510290330 A CN 201510290330A CN 106288567 B CN106288567 B CN 106288567B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The present invention provides a kind of central air-conditioning starting control method, comprising: determines suction draught head and normal suction draught head according to compressor and refrigerant；The practical pressure of inspiration(Pi) and actual exhaust air pressure of compressor are measured, and calculates the difference of the practical pressure of inspiration(Pi) and the actual exhaust air pressure；Compare difference and suction draught head.Central air-conditioning provided by the invention starts control method, it is controlled respectively by regulating time, drop of suction pressure rate and freezing inflow temperature three, circulation pressure difference can be quickly established in the compressor start stage, long-time pressure difference is prevented to be unsatisfactory for, cause compressor operation operating condition abnormal, the problem of complete machine refrigeration or heating effect difference.
Description
Technical field
The invention belongs to air-conditioning equipment control fields more particularly to a kind of central air-conditioning to start control method.
Background technique
Currently, central air-conditioning is due to it has the advantage that low energy consumption and temperature control can be strong in operation of air conditioning systems
Approval and use by the majority of consumers.And in the hot summer or cold winter, it is realized after power-on of air conditioner booting indoor
The down or up speed speed of temperature will have a direct impact on refrigeration or heating comfort level, so the speed of booting refrigerating/heating is
Measure one of the important indicator of air-conditioning products temperature control energy.
But general central air-conditioning all controls the control of expansion valve using suction superheat substantially, but in press
Startup stage, suction draught head is smaller, is easy the report too low failure of pressure difference, causes the fault alarm of mistake, and then influence central hollow
The workability energy and working efficiency of tune.
Summary of the invention
Therefore, the present invention, which provides one kind, quickly to execute control to expansion valve, quickly establish the central hollow regulating the qi flowing in the channels of pressure difference
Flowing control method.
A kind of central air-conditioning starting control method, comprising:
Suction and discharge pressure difference and normal suction and discharge pressure difference are determined according to the parameter of compressor and refrigerant parameter；
The practical pressure of inspiration(Pi) and actual exhaust air pressure of the compressor are measured, and calculates the practical pressure of inspiration(Pi) and institute
State the difference of actual exhaust air pressure；
Compare difference and the suction and discharge pressure difference；
If difference is less than the suction and discharge pressure difference, pass through the evaporating pressure variable expansion valve aperture of air-conditioning, until
When the difference is greater than normal suction draught head, pass through refrigerant degree of superheat variable expansion valve aperture；
If difference is not less than the suction and discharge pressure difference, pass through refrigerant degree of superheat variable expansion valve aperture.
The process that the evaporating pressure by air-conditioning adjusts the expansion valve opening includes at least the comparison of following one
Process: the time compares, drop of suction pressure rate compares and freezes inflow temperature range and compares；The time compares prior to institute
It states drop of suction pressure rate and compares and compare prior to the freezing inflow temperature range.
The time relatively includes:
The setting regulating time of the expansion valve is set, and measures the practical adjustments time for adjusting the expansion valve, if institute
The practical adjustments time is stated greater than the setting regulating time, then passes through refrigerant degree of superheat variable expansion valve.
The drop of suction pressure rate relatively includes:
The first setting value and the second setting value of drop of suction pressure rate are set, second setting value is greater than described the
One setting value；
Set the opening angle and closing angle of each expansion valve；
When the practical adjustments time being less than the setting regulating time, to the practical drop of suction pressure rate and
First setting value and the second setting value are compared respectively；
If the practical drop of suction pressure rate is less than first setting value, inflow temperature tune is freezed by air-conditioning
Save expansion valve opening；
If the practical drop of suction pressure rate is greater than second setting value, it is opened into according to the opening angle
A few expansion valve, and iterate through air-conditioning evaporating pressure variable expansion valve aperture；
It is swollen if the practical drop of suction pressure rate is between first setting value and second setting value
Swollen valve opening remains unchanged, and passes through air-conditioning evaporating pressure variable expansion valve aperture.
The drop of suction pressure rate compares further include:
When the practical drop of suction pressure rate is greater than second setting value, and opened according to the opening angle rate
After opening expansion valve, and the practical adjustments time be less than the setting regulating time when, again to the practical pressure of inspiration(Pi)
Fall off rate is compared with first setting value and the second setting value carry out respectively；
If the practical drop of suction pressure rate is not less than first setting value, opened according to the opening angle
Expansion valve at least once, and iterate through air-conditioning evaporating pressure variable expansion valve aperture.
When opening expansion valve according to the opening angle, continuously open three times.
Freezing inflow temperature range relatively includes:
When freezing inflow temperature variable expansion valve aperture by air-conditioning:
Setting freezing inflow temperature range and maximum inspiratory pressure corresponding with the freezing inflow temperature range and minimum
Pressure of inspiration(Pi)；
The practical freezing inflow temperature of measurement, and determine the freezing inflow temperature model locating for practical freezing inflow temperature
It encloses；
The practical pressure of inspiration(Pi) is compared respectively with the maximum inspiratory pressure and minimal inspiratory pressure；
If practical pressure of inspiration(Pi) is greater than the maximum inspiratory pressure, expanded at least once according to closing angle closing
Valve, and iterate through air-conditioning evaporating pressure variable expansion valve aperture；
If practical pressure of inspiration(Pi) is less than the minimal inspiratory pressure, expanded at least once according to opening angle unlatching
Valve, and iterate through air-conditioning evaporating pressure variable expansion valve aperture；
If practical pressure of inspiration(Pi) is between the minimal inspiratory pressure and maximum inspiratory pressure, expansion valve is kept to open
Degree.
When opening expansion valve according to the opening angle, continuously open five times；It is swollen when being closed according to the closing angle
It is continuous to close five times when swollen valve.
The practical freezing inflow temperature is to freeze inflow temperature for the first time.
The suction and discharge pressure differential range is 0.1Mpa to 1.9Mpa.
The range of first setting value of the drop of suction pressure rate is the central air-conditioning low pressure alarming value
1/107-1/75。
The range of second setting value of the drop of suction pressure rate is the central air-conditioning low pressure alarming value
1/80-1/50。
" drop of suction pressure rate " mentioned in the present invention refers to the changing value of pressure of inspiration(Pi) within a certain period of time
With the ratio before variation.
Central air-conditioning provided by the invention starts control method, respectively by regulating time, drop of suction pressure rate and
Freezing inflow temperature three controls, and can quickly establish circulation pressure difference in the compressor start stage, prevent from pressing for a long time
Difference is unsatisfactory for, and causes compressor operation operating condition abnormal, the problem of complete machine refrigeration or heating effect difference.
Figure of description
Fig. 1 is the flow chart of central air-conditioning starting control method provided by the invention；
Fig. 2 is the flow chart of the embodiment of central air-conditioning starting control method provided by the invention.
Specific embodiment
Below by specific embodiment and in conjunction with attached drawing, the present invention will be described in detail.
Central air-conditioning as shown in Figure 1 starts control method, comprising:
Suction and discharge pressure difference and normal suction and discharge pressure difference are determined according to the parameter of compressor and refrigerant parameter；
The practical pressure of inspiration(Pi) and actual exhaust air pressure of the compressor are measured, and calculates the practical pressure of inspiration(Pi) and institute
State the difference of actual exhaust air pressure；
Compare difference and the suction and discharge pressure difference；
If difference is less than the suction and discharge pressure difference, pass through the evaporating pressure variable expansion valve aperture of air-conditioning, until
When the difference is greater than normal suction draught head, pass through refrigerant degree of superheat variable expansion valve aperture；
If difference is not less than the suction and discharge pressure difference, pass through refrigerant degree of superheat variable expansion valve aperture.
The process that the evaporating pressure by air-conditioning adjusts the expansion valve opening includes at least the comparison of following one
Process: the time compares, drop of suction pressure rate compares and freezes inflow temperature range and compares；The time compares prior to institute
It states drop of suction pressure rate and compares and compare prior to the freezing inflow temperature range.
The time relatively includes:
The setting regulating time of the expansion valve is set, and measures the practical adjustments time for adjusting the expansion valve, if institute
The practical adjustments time is stated greater than the setting regulating time, then passes through refrigerant degree of superheat variable expansion valve.
The drop of suction pressure rate relatively includes:
The first setting value and the second setting value of drop of suction pressure rate are set, second setting value is greater than described the
One setting value；
Set the opening angle and closing angle of each expansion valve；
When the practical adjustments time being less than the setting regulating time, to the practical drop of suction pressure rate and
First setting value and the second setting value are compared respectively；
If the practical drop of suction pressure rate is less than first setting value, inflow temperature tune is freezed by air-conditioning
Save expansion valve opening；
If the practical drop of suction pressure rate is greater than second setting value, it is opened into according to the opening angle
A few expansion valve, and iterate through air-conditioning evaporating pressure variable expansion valve aperture；
It is swollen if the practical drop of suction pressure rate is between first setting value and second setting value
Swollen valve opening remains unchanged, and passes through air-conditioning evaporating pressure variable expansion valve aperture.
The drop of suction pressure rate compares further include:
When the practical drop of suction pressure rate is greater than second setting value, and opened according to the opening angle rate
After opening expansion valve, and the practical adjustments time be less than the setting regulating time when, again to the practical pressure of inspiration(Pi)
Fall off rate is compared with first setting value and the second setting value carry out respectively；
If the practical drop of suction pressure rate is not less than first setting value, opened according to the opening angle
Expansion valve at least once, and iterate through air-conditioning evaporating pressure variable expansion valve aperture.
When opening expansion valve according to the opening angle, continuously open three times.
Freezing inflow temperature range relatively includes:
When freezing inflow temperature variable expansion valve aperture by air-conditioning:
Setting freezing inflow temperature range and maximum inspiratory pressure corresponding with the freezing inflow temperature range and minimum
Pressure of inspiration(Pi)；
The practical freezing inflow temperature of measurement, and determine the freezing inflow temperature model locating for practical freezing inflow temperature
It encloses；
The practical pressure of inspiration(Pi) is compared respectively with the maximum inspiratory pressure and minimal inspiratory pressure；
If practical pressure of inspiration(Pi) is greater than the maximum inspiratory pressure, expanded at least once according to closing angle closing
Valve, and iterate through air-conditioning evaporating pressure variable expansion valve aperture；
If practical pressure of inspiration(Pi) is less than the minimal inspiratory pressure, expanded at least once according to opening angle unlatching
Valve, and iterate through air-conditioning evaporating pressure variable expansion valve aperture；
If practical pressure of inspiration(Pi) is between the minimal inspiratory pressure and maximum inspiratory pressure, expansion valve is kept to open
Degree.
When opening expansion valve according to the opening angle, continuously open five times；It is swollen when being closed according to the closing angle
When swollen valve, continuously open five times.
The practical freezing inflow temperature is to freeze inflow temperature for the first time.
The suction and discharge pressure differential range is 0.1Mpa to 1.9Mpa.
The range of first setting value of the drop of suction pressure rate is the central air-conditioning low pressure alarming value
1/107-1/75。
The range of second setting value of the drop of suction pressure rate is the central air-conditioning low pressure alarming value
1/80-1/50
Embodiment
It is as shown in Figure 2: to select R22 refrigerant and have a grade helical-lobe compressor；
Then according to refrigerant and compressor, suction draught head is set as 0.4Mpa, normal suction draught head is 0.43Mpa；
Set the expansion valve set regulating time as 5 minutes；
The first setting value is set as x1=0.003Mpa/s, the second setting value are x2=0.004Mpa/s；
Setting freezing inflow temperature t range be respectively 10 DEG C of t <, 10 DEG C≤t≤12 DEG C, 12 DEG C of t≤14 DEG C < and t be greater than
14 DEG C, and maximum inspiratory pressure and minimal inspiratory pressure corresponding to each freezing inflow temperature range are set, it is as follows:
Wherein, electric expansion valve pressure controls stage low pressure alarming value when selecting R22 refrigerant are as follows: 0.32Mpa.
Actual measurement obtains:
The practical pressure of inspiration(Pi) of compressor is 0.50Mpa and actual exhaust air pressure is 0.64Mpa, and difference is 0.14Mpa <
0.4Mpa, then entry time comparison phase；
Regulating time was 2 minutes less than 5 minutes, into drop of suction pressure rate adaptation；
Practical drop of suction pressure rate is 0.006Mpa/s for the first time, is greater than x2=0.004Mpa/s, then according to expansion
It is primary that valve opening angle opens expansion valve；
After primary according to expansion valve opening angle unlatching expansion valve, second of practical drop of suction pressure rate is
0.0035Mpa/s is greater than x1=0.003Mpa/s is less than x2=0.004Mpa/s is opened again according to expansion valve opening angle
Expansion valve is primary；
Again according to expansion valve opening angle open expansion valve it is primary after, the practical drop of suction pressure rate of third time is
0.002Mpa/s is less than x1=0.003Mpa/s then enters freezing inflow temperature control；
Measuring freezing inflow temperature is 13 DEG C, then selecting freezing inflow temperature range is 12 DEG C of t≤14 DEG C <, compares air-breathing
Pressure is 0.5Mpa, is less than p50.53Mpa, be greater than p60.47Mpa, then again measure compressor pressure of inspiration(Pi) and exhaust
Pressure；
It is 0.5Mpa that measurement, which obtains second of pressure of inspiration(Pi), and second of pressure at expulsion is 1.64Mpa, difference 1.14Mpa
> 0.43Mpa then enters refrigerant degree of superheat variable expansion valve aperture, that is, shows that the central air conditioner system starts completely, complete
At adjustment process.
Only the preferred embodiments of the present invention have been described above, it is noted that for the ordinary skill of the art
For personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (12)
1. a kind of central air-conditioning starts control method, it is characterised in that: include:
Suction and discharge pressure difference and normal suction and discharge pressure difference are determined according to the parameter of compressor and refrigerant parameter；
The practical pressure of inspiration(Pi) and actual exhaust air pressure of the compressor are measured, and calculates the practical pressure of inspiration(Pi) and the reality
The difference of border pressure at expulsion；
Compare difference and the suction and discharge pressure difference；
If difference is less than the suction and discharge pressure difference, pass through the evaporating pressure variable expansion valve aperture of air-conditioning, until described
When difference is greater than normal suction draught head, pass through refrigerant degree of superheat variable expansion valve aperture；
If difference is not less than the suction and discharge pressure difference, pass through refrigerant degree of superheat variable expansion valve aperture.
2. central air-conditioning according to claim 1 starts control method, it is characterised in that: described
The comparison procedure of following one: time is included at least by the process that the evaporating pressure of air-conditioning adjusts the expansion valve opening
Comparison, drop of suction pressure rate compare and freeze inflow temperature range and compare；The time compares prior to the pressure of inspiration(Pi)
Power fall off rate compares；The drop of suction pressure rate compares to be compared prior to the freezing inflow temperature range.
3. central air-conditioning according to claim 2 starts control method, it is characterised in that: the time relatively includes:
The setting regulating time of the expansion valve is set, and measures the practical adjustments time for adjusting the expansion valve, if the reality
Border regulating time is greater than the setting regulating time, then passes through refrigerant degree of superheat variable expansion valve.
4. central air-conditioning according to claim 3 starts control method, it is characterised in that: the drop of suction pressure rate
Compare and includes:
The first setting value and the second setting value of drop of suction pressure rate are set, second setting value is greater than described first and sets
Definite value；
Set the opening angle and closing angle of each expansion valve；
When the practical adjustments time be less than the setting regulating time when, to the practical drop of suction pressure rate with it is described
First setting value and the second setting value are compared respectively；
If the practical drop of suction pressure rate is less than first setting value, it is swollen that inflow temperature adjusting is freezed by air-conditioning
Swollen valve opening；
If the practical drop of suction pressure rate is greater than second setting value, at least one is opened according to the opening angle
Secondary expansion valve, and iterate through air-conditioning evaporating pressure variable expansion valve aperture；If the practical drop of suction pressure rate is in
When between first setting value and second setting value, expansion valve opening is remained unchanged, and passes through air-conditioning evaporating pressure tune
Save expansion valve opening.
5. central air-conditioning according to claim 4 starts control method, it is characterised in that: the drop of suction pressure rate
Compare further include:
When the practical drop of suction pressure rate be greater than second setting value, and according to the opening angle open expansion valve
Later, when and the practical adjustments time is less than the setting regulating time, again to the practical drop of suction pressure rate
Compared with first setting value and the second setting value carry out respectively；
If the practical drop of suction pressure rate is not less than first setting value, opened at least according to the opening angle
Expansion valve, and iterate through air-conditioning evaporating pressure variable expansion valve aperture.
6. central air-conditioning according to claim 5 starts control method, it is characterised in that: opened when according to the opening angle
When opening expansion valve, continuously open three times.
7. central air-conditioning according to claim 4 starts control method, it is characterised in that: freezing inflow temperature range compares
Include:
When freezing inflow temperature variable expansion valve aperture by air-conditioning:
Setting freezing inflow temperature range and maximum inspiratory pressure corresponding with the freezing inflow temperature range and minimum air-breathing
Pressure；
The practical freezing inflow temperature of measurement, and determine the freezing inflow temperature range locating for practical freezing inflow temperature；
The practical pressure of inspiration(Pi) is compared respectively with the maximum inspiratory pressure and minimal inspiratory pressure；
If practical pressure of inspiration(Pi) is greater than the maximum inspiratory pressure, expansion valve at least once is closed according to the closing angle,
And iterate through air-conditioning evaporating pressure variable expansion valve aperture；
If practical pressure of inspiration(Pi) is less than the minimal inspiratory pressure, expansion valve at least once is opened according to the opening angle,
And iterate through air-conditioning evaporating pressure variable expansion valve aperture；
If practical pressure of inspiration(Pi) is between the minimal inspiratory pressure and maximum inspiratory pressure, expansion valve opening is kept.
8. central air-conditioning according to claim 7 starts control method, it is characterised in that: opened when according to the opening angle
When opening expansion valve, continuously open five times；It is continuous to close five times when closing expansion valve according to the closing angle.
9. central air-conditioning according to claim 7 starts control method, it is characterised in that: the practical freezing inflow temperature
For the freezing inflow temperature of first time measurement.
10. central air-conditioning according to claim 1 starts control method, it is characterised in that: the suction and discharge pressure differential range
For 0.1Mpa to 1.9Mpa.
11. central air-conditioning according to claim 2 starts control method, it is characterised in that: the drop of suction pressure speed
The range of first setting value of rate is the 1/107-1/75 of the central air-conditioning low pressure alarming value.
12. central air-conditioning according to claim 2 starts control method, it is characterised in that: the drop of suction pressure speed
The range of second setting value of rate is the 1/80-1/50 of the central air-conditioning low pressure alarming value.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107631431A (en) * | 2017-09-25 | 2018-01-26 | 珠海格力电器股份有限公司 | Air conditioning control method and device |
| CN110160293B (en) * | 2018-02-06 | 2021-02-09 | 中山深宝电器制造有限公司 | Control method for EEV electronic expansion valve of low-temperature heating machine |
| CN108954714B (en) * | 2018-07-25 | 2020-12-15 | 广东美的暖通设备有限公司 | Air conditioner and starting control method thereof |
| CN112019030B (en) * | 2019-05-31 | 2021-11-19 | 广东美的制冷设备有限公司 | Operation control method, device, circuit, household appliance and computer storage medium |
| CN113883744B (en) * | 2021-09-28 | 2023-05-26 | 青岛海尔中央空调有限公司 | Control method for water chilling unit |
| CN114279113B (en) * | 2021-12-29 | 2024-01-30 | 中山市爱美泰电器有限公司 | Control method for quickly positioning opening of electronic expansion valve after defrosting of heat pump system |
| CN116294341B (en) * | 2023-05-12 | 2023-09-05 | 海杰亚（北京）医疗器械有限公司 | Control method for stabilizing pressure source of refrigeration system and refrigeration system |
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