CN104567160B - Load adjusting system and method of water chilling unit, water chilling unit and central air conditioner - Google Patents
Load adjusting system and method of water chilling unit, water chilling unit and central air conditioner Download PDFInfo
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- CN104567160B CN104567160B CN201410833410.4A CN201410833410A CN104567160B CN 104567160 B CN104567160 B CN 104567160B CN 201410833410 A CN201410833410 A CN 201410833410A CN 104567160 B CN104567160 B CN 104567160B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000008859 change Effects 0.000 claims abstract description 54
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 239000006200 vaporizer Substances 0.000 claims description 44
- 230000033228 biological regulation Effects 0.000 claims description 14
- 238000004378 air conditioning Methods 0.000 claims description 11
- 230000008014 freezing Effects 0.000 claims description 9
- 238000007710 freezing Methods 0.000 claims description 9
- 230000000052 comparative effect Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 2
- 239000000498 cooling water Substances 0.000 abstract 1
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004899 motility Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- 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 load adjusting system and method of a water chilling unit, the water chilling unit and a central air conditioner. This load governing system of cooling water set includes: the detection unit is connected to the water chilling unit and detects the change rate of the heat load of the user; and the controller (5) is connected to the detection unit and controls the load of the water chilling unit according to the change rate of the heat load of the user detected by the detection unit. According to the load adjusting system, the proper load of the water chilling unit can be selected according to the thermal load change rate of a user, and the reliability and the stability of the operation of the water chilling unit are improved.
Description
Technical field
The present invention relates to handpiece Water Chilling Units Load Regulation technical field, cold in particular to one
The load control system of water unit and method, handpiece Water Chilling Units and central air-conditioning.
Background technology
In Large Central Air Conditioning System water system, when user's thermic load is suddenly or in week regular hour
When producing significant change in the phase, the regulative mode according to central air conditioning water system is different, can cause
Freezing temperature or the change of chilled-water flow, thus it requires refrigeration unit can be done rapidly according to change
Go out corresponding regulation.
At present for common centrifugal refrigerating machines, owing to centrifugal compressor is velocity profile
Compressor, its Load Regulation relies solely on wicket gate control, is difficult to quickly regulate according to working conditions change
Unit load.Comparatively speaking, for frequency conversion centrifugal compressor, owing to its rotating speed is scalable
, unit operation wider range, therefore can be according to freezing temperature when working conditions change is slower
Change regulation unit load, it is achieved even running.But, although this compressor can meet
The situation that working conditions change is the mildest, but the in the case of of suddenling change for user's thermic load, particularly exist
User's thermic load is by when reducing greatly, and compressor is difficult to the most significantly unload from heavy-duty service state
Carry, often lead to unit and still operate in bigger load condition when user reduces workload demand,
Thus ideal case occurs.This results in actual motion along with the reduction of user's thermic load is made
The problem becoming unit frequent start-stop, yet there are no effective solution.
The patent of Patent No. CN200520119652.3 discloses a kind of sky with discharge mechanism
Adjusting system, but this patent is only the means that the unloading of usual air conditioning system load is conventional, not for
The situation of sudden load change proposes effective solution, and therefore this air conditioning system cannot make compressor
The most significantly unload to meet sudden load change.
Summary of the invention
The embodiment of the present invention provides load control system and method, the cold water of a kind of handpiece Water Chilling Units
Unit and central air-conditioning, it is possible to control the load of handpiece Water Chilling Units according to user's thermic load rate of change,
Improve handpiece Water Chilling Units reliability of operation and stability.
For solving above-mentioned technical problem, the embodiment of the present invention provides the load of a kind of handpiece Water Chilling Units to adjust
Joint system, handpiece Water Chilling Units includes compressor, condenser, choke valve and vaporizer, Load Regulation
System includes: detector unit, is connected to handpiece Water Chilling Units, and detects user's thermic load rate of change；
Controller, is connected to detector unit, the user's thermic load change speed detected according to detector unit
Rate controls the load of handpiece Water Chilling Units.
As preferably, controller is connected to compressor, and according to user's thermic load rate of change control
The loading that compressor unloading processed is different.
As preferably, detector unit include being connected to vaporizer freezing inflow temperature sensor,
Chilled water flow quantity sensor or evaporator pressure sensor, connect between detector unit and controller
It is connected to A/D analog converter.
As preferably, detector unit includes evaporator pressure sensor, and load control system also wraps
Including comparator, comparator is connected between evaporator pressure sensor and controller, in comparator
Being equipped with speed and preset device, speed is preset device and is included first rate preset value and the second speed preset value,
Comparator is fast with first respectively for the pressure drop rate detected by evaporator pressure sensor
Rate preset value and the second speed preset value compare, and comparative result is delivered to controller.
As preferably, detector unit also includes period setting unit, and detector unit set according to the cycle
The pressure drop rate of the computation of Period vaporizer that cell sets.
As preferably, on the ball valve of the relief valve that evaporator pressure sensor is arranged on vaporizer.
According to a further aspect in the invention, it is provided that the load adjusting method of a kind of handpiece Water Chilling Units,
Handpiece Water Chilling Units includes compressor, condenser, choke valve and vaporizer, and load adjusting method includes:
Step S1: detection user's thermic load rate of change；Step S2: according to user's thermic load change speed
Rate controls the load of handpiece Water Chilling Units.
As preferably, step S2 includes: according to user's thermic load rate of change to compressor unloading
Different loading.
As preferably, step S1 includes: step S11: the vaporizer in detection predetermined period t
Interior pressure initial value P1 and pressure end value P2；Step S12: according to the vaporizer detected
Interior force value determines the pressure drop rate Ve in vaporizer.
As preferably, step S2 includes: step S21: by pressure drop rate Ve respectively with
First rate preset value V1 and the second speed preset value V2 compares: step S22: work as Ve
During≤V1, compressor load reduces X1；As V1≤Ve≤V2, compressor load reduces
X2；As Ve >=V2, compressor load reduces X3；Wherein, X1 ＜ X2 ＜ X3.
In accordance with a further aspect of the present invention, it is provided that a kind of handpiece Water Chilling Units, including compressor, cold
Condenser, choke valve and vaporizer, also include the load control system of above-mentioned handpiece Water Chilling Units.
In accordance with a further aspect of the present invention, it is provided that a kind of central air-conditioning, including compressor, cold
Condenser, choke valve and vaporizer, also include the load control system of above-mentioned handpiece Water Chilling Units.
Application technical scheme, the load control system of handpiece Water Chilling Units includes: detection is single
Unit, is connected to handpiece Water Chilling Units, and detects user's thermic load rate of change；Controller, is connected to
Detector unit, controls according to user's thermic load rate of change that described detector unit detects
The load of handpiece Water Chilling Units.During handpiece Water Chilling Units works, can become according to user's thermic load
Change speed and select suitable handpiece Water Chilling Units Load Regulation amount so that handpiece Water Chilling Units can be according to difference
User's thermic load rate of change select suitable load, make the load of handpiece Water Chilling Units and user's heat
Load keeps consistent, improves handpiece Water Chilling Units reliability of operation and stability.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of the load control system of the handpiece Water Chilling Units of the embodiment of the present invention；
Fig. 2 is the control structure figure of the load control system of the handpiece Water Chilling Units of the embodiment of the present invention；；
Fig. 3 is the control principle drawing of the load adjusting method of the handpiece Water Chilling Units of the embodiment of the present invention；
Fig. 4 is the workflow diagram of the load adjusting method of the handpiece Water Chilling Units of the embodiment of the present invention.
Description of reference numerals:
1, compressor；2, condenser；3, choke valve；4, vaporizer；5, controller；6、
Evaporator pressure sensor；7, A/D analog converter；8, comparator.
Detailed description of the invention
With specific embodiment, the present invention is described in further detail below in conjunction with the accompanying drawings, but does not makees
For limitation of the invention.
Seeing shown in Fig. 1 to Fig. 4, according to embodiments of the invention, handpiece Water Chilling Units includes compression
Machine 1, condenser 2, choke valve 3 and vaporizer 4, the load control system of handpiece Water Chilling Units includes:
Detector unit, is connected to handpiece Water Chilling Units, and detects user's thermic load rate of change；Controller 5,
It is connected to detector unit, controls cold according to user's thermic load rate of change that detector unit detects
The load of water unit.
During handpiece Water Chilling Units works, can select to close according to user's thermic load rate of change
The Load Regulation amount of suitable handpiece Water Chilling Units so that handpiece Water Chilling Units can be born according to different user's heat
Lotus rate of change selects suitable load, makes the load of handpiece Water Chilling Units keep one with user's thermic load
Cause, improve handpiece Water Chilling Units reliability of operation and stability.
Controller 5 is connected to compressor 1, and controls compressor according to user's thermic load rate of change
The loading that 1 unloading is different.In the present embodiment, controller 5 is MCU microprogram control unit.
When user's thermic load changes, according to the difference of central air conditioning water system, can be from vaporizer
Side freezing inflow temperature (i.e. from the return water temperature of user side) or chilled-water flow embody and shadow
Ring to unit.When user's thermic load is suddenly or in certain period of time by when reducing greatly, and freezing is intake
Temperature or chilled-water flow reduce accordingly, and the pressure in unit vaporizer 4 is to this change more
Sensitivity, response time is short, the most quickly decreases.Based on above-mentioned analysis, determining user
During thermic load rate of change, vaporizer side freezing inflow temperature rate of change, freezing can be passed through
Pressure drop rate in discharge rate of change or vaporizer 4 embodies user's thermic load
Rate of change.
Therefore, detector unit can include being connected to vaporizer 4 freezing inflow temperature sensor,
Chilled water flow quantity sensor or evaporator pressure sensor 6, between detector unit and controller 5
Connect and have A/D analog converter 7, transmit after digital signal can be converted analog signals into
To controller 5, then according to the data that sensor detects, controller determines that user's thermic load changes
Speed, and according to user's thermic load rate of change, the load of handpiece Water Chilling Units is adjusted.
In the present embodiment, detector unit includes evaporator pressure sensor 6, load control system
Also include that comparator 8, comparator 8 are connected between evaporator pressure sensor 6 and controller 5,
Comparator 8 is built-in with speed and presets device, and speed is preset device and included first rate preset value and second
Speed preset value, comparator 8 declines for the pressure detected by evaporator pressure sensor 6
Speed Ve compares with first rate preset value V1 and the second speed preset value V2 respectively,
And comparative result is delivered to controller 5, controller 5 can be according to the different choice of comparative result
Different compressor load discharging quantities, better adapts to working conditions change.
Detector unit can also include period setting unit, and detector unit is according to period setting unit
The pressure drop rate of the computation of Period vaporizer 4 set.Staff can be by this cycle
Setup unit sets the pressure detecting cycle of vaporizer 4.Certainly, detector unit can not also set
Determine the pressure detecting cycle in vaporizer 4, but set a pressure change difference, and steaming
When sending out the pressure change difference that the change of the pressure in device 4 reaches to set, calculating reaches this pressure and becomes
Change the time of difference, and calculate the pressure drop rate in vaporizer 4 accordingly.
Preferably, on the ball valve of the relief valve that evaporator pressure sensor 6 is arranged on vaporizer 4,
More real-time the force value in vaporizer 4 can be detected.Evaporator pressure passes
Sensor 6 can also be arranged on other positions being connected with vaporizer 4.At evaporator pressure
While sensor 6 detects the pressure in vaporizer 4, these detection data can be sent to
MCU microprogram control unit, and the memory RAM stored to MCU microprogram control unit,
Then MCU microprogram control unit can be by the real-time change speed of the pressure in contrast vaporizer 4
Rate regulation compressor load.
In conjunction with seeing shown in Fig. 3 and Fig. 4, handpiece Water Chilling Units includes compressor 1, condenser 2, joint
Stream valve 3 and vaporizer 4, the load adjusting method of handpiece Water Chilling Units includes: step S1: detection is used
Family thermic load rate of change；Step S2: control handpiece Water Chilling Units according to user's thermic load rate of change
Load.
By different user's thermic load rate of changes is selected suitable handpiece Water Chilling Units load, can
So that user's thermic load quickly keeps consistent with the load of handpiece Water Chilling Units, improve handpiece Water Chilling Units and run
Reliability and stability.
The step of the load of described handpiece Water Chilling Units is controlled, specifically according to user's thermic load rate of change
Show as, according to user's thermic load rate of change, compressor 1 is unloaded different loading.
Step S1 includes: step S11: the pressure in vaporizer 4 in detection predetermined period t
Initial value P1 and pressure end value P2；Step S12: according to the pressure in the vaporizer 4 detected
Force value determines the pressure drop rate Ve in vaporizer 4.Wherein pressure drop rate Ve=
(P2-P1)/t。
Step S2 includes: step S21: by pressure drop rate Ve respectively with set in advance
First rate preset value V1 and the second speed preset value V2 compares: step S22: work as Ve
During≤V1, the load of compressor 1 reduces X1；As V1≤Ve≤V2, compressor 1
Load reduces X2；As Ve >=V2, the load of compressor 1 reduces X3；Wherein, X1 ＜
X2 ＜ X3.Section is more compared, each ratio it is of course also possible to divide according to the actual needs
Relatively section is corresponding to different speed preset value such that it is able to unloads the load of compressor 1 and is loaded into
Row is the trickleest to be adjusted accurately.
After above-mentioned control triggers, priority is more than the normal regulating of compressor 1, therefore when cold
When the thermic load of water unit is undergone mutation, after entering Load Regulation control, controller 5 is permissible
Compressor 1 forced unloading life in various degree is given according to the pressure drop rate in vaporizer 4
Order, thus the load of mandatory down low compression machine 1.When pressure drop rate Ve is bigger, i.e. steam
Sending out the pressure of device 4 when declining quickly, compressor 1 can be to reduce load by a relatively large margin, with suitable
Answer working conditions change；When pressure drop rate Ve is less, compressor 1 can be to subtract more by a small margin
Smaller load.Pressure drop rate Ve is the biggest, and the amplitude of the Load Regulation of compressor 1 is the biggest,
Therefore can change according to the thermic load of handpiece Water Chilling Units and select suitable discharging quantity, have preferably
Motility, can more efficiently ensure the reliable and stable work of compressor 1.
According to embodiments of the invention, it is provided that a kind of handpiece Water Chilling Units, including compressor 1, condensation
Device 2, choke valve 3 and vaporizer 4, also include the load control system of above-mentioned handpiece Water Chilling Units.
According to embodiments of the invention, it is provided that a kind of central air-conditioning, including compressor 1, cold
Condenser 2, choke valve 3 and vaporizer 4, also include the load control system of above-mentioned handpiece Water Chilling Units.
It can be seen from the above description that the invention have the advantages that
1. centrifugal refrigerating machines can be made to be automatically adjusted cold water according to working conditions change in engineer applied
Unit operation situation, improves handpiece Water Chilling Units and automatically controls ability；
2., when user's thermic load reduces suddenly, corresponding regulation can be made rapidly and become with adaptation condition
Change, improve the reliability of handpiece Water Chilling Units, it is to avoid the problem of frequent start-stop, make handpiece Water Chilling Units
Can equal even running in full working scope range of operation.
Certainly, it is above the preferred embodiment of the present invention.It should be pointed out that, and this technology is led
For the those of ordinary skill in territory, on the premise of without departing from its general principles, it is also possible to
Making some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a load control system for handpiece Water Chilling Units, described handpiece Water Chilling Units include compressor (1),
Condenser (2), choke valve (3) and vaporizer (4), it is characterised in that described Load Regulation
System includes:
Detector unit, is connected to described handpiece Water Chilling Units, and detects user's thermic load rate of change；
Controller (5), is connected to described detector unit, detects according to described detector unit
Described user's thermic load rate of change controls the load of described handpiece Water Chilling Units,
Wherein, described detector unit includes described evaporator pressure sensor (6), described load
Regulation system also includes that comparator (8), described comparator (8) are connected to described evaporator pressure
Between sensor (6) and described controller (5), it is pre-that described comparator (8) is built-in with speed
If device, described speed is preset device and is included first rate preset value and the second speed preset value, described
Comparator (8) is reduction of speed under the pressure described evaporator pressure sensor (6) detected
Rate compares with described first rate preset value and the second speed preset value respectively, and by comparative result
It is delivered to described controller (5).
The load control system of handpiece Water Chilling Units the most according to claim 1, it is characterised in that
Described controller (5) is connected to described compressor (1), and changes according to described user's thermic load
Compressor described in rate controlled (1) unloads different loading.
Load control system the most according to claim 2, it is characterised in that described detection list
Unit includes being connected to the freezing inflow temperature sensor of described vaporizer (4), chilled-water flow passes
Sensor or evaporator pressure sensor (6), described detector unit and described controller (5) it
Between connect have A/D analog converter (7).
Load control system the most according to claim 1, it is characterised in that described detection list
Unit also includes that period setting unit, described detector unit set according to described period setting unit
The pressure drop rate of vaporizer described in computation of Period (4).
Load control system the most according to claim 1, it is characterised in that described vaporizer
On the ball valve of the relief valve that pressure transducer (6) is arranged on described vaporizer (4).
6. a load adjusting method for handpiece Water Chilling Units, described handpiece Water Chilling Units include compressor (1),
Condenser (2), choke valve (3) and vaporizer (4), it is characterised in that described Load Regulation
Method includes:
Step S1: detection user's thermic load rate of change；
Step S2: control the load of described handpiece Water Chilling Units according to user's thermic load rate of change, its
In, described step S2 includes:
Step S21: by pressure drop rate Ve respectively with first rate preset value V1 and second
Speed preset value V2 compares:
Step S22:
As Ve≤V1, compressor (1) load reduces X1；
As V1≤Ve≤V2, compressor (1) load reduces X2；
As Ve >=V2, compressor (1) load reduces X3；
Wherein, X1 ＜ X2 ＜ X3.
Load adjusting method the most according to claim 6, it is characterised in that described step
S2 includes: according to user's thermic load rate of change, compressor (1) is unloaded different loading.
Load adjusting method the most according to claim 7, it is characterised in that described step
S1 includes:
Step S11: detection predetermined period t in vaporizer (4) in pressure initial value P1 and
Pressure end value P2；
Step S12: determine vaporizer (4) according to the force value in the vaporizer (4) detected
Interior pressure drop rate Ve.
9. a handpiece Water Chilling Units, including compressor (1), condenser (2), choke valve (3) and
Vaporizer (4), it is characterised in that also include according to any one of claim 1 to 5 is cold
The load control system of water unit.
10. a central air-conditioning, including compressor (1), condenser (2), choke valve (3)
With vaporizer (4), it is characterised in that also include according to any one of claim 1 to 5
The load control system of handpiece Water Chilling Units.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410833410.4A CN104567160B (en) | 2014-12-26 | 2014-12-26 | Load adjusting system and method of water chilling unit, water chilling unit and central air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410833410.4A CN104567160B (en) | 2014-12-26 | 2014-12-26 | Load adjusting system and method of water chilling unit, water chilling unit and central air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104567160A CN104567160A (en) | 2015-04-29 |
| CN104567160B true CN104567160B (en) | 2017-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410833410.4A Active CN104567160B (en) | 2014-12-26 | 2014-12-26 | Load adjusting system and method of water chilling unit, water chilling unit and central air conditioner |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4506517A (en) * | 1982-08-09 | 1985-03-26 | General Motors Corporation | Air conditioning compressor unloading control system |
| CN1534259A (en) * | 2003-03-31 | 2004-10-06 | 上海百富勤空调设备有限公司 | Fuzzy control method of screw refrygerating compressor energy |
| JP2011089714A (en) * | 2009-10-23 | 2011-05-06 | Hitachi Appliances Inc | Refrigerating device |
| KR20140091794A (en) * | 2013-01-07 | 2014-07-23 | 삼성전자주식회사 | Air conditioner and method for controlling the same |
| CN204555466U (en) * | 2014-12-26 | 2015-08-12 | 珠海格力电器股份有限公司 | Load adjusting system of water chilling unit, water chilling unit and central air conditioner |
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2014
- 2014-12-26 CN CN201410833410.4A patent/CN104567160B/en active Active
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