CN101865551B - Suction valve pulse width modulation control based on pressure of evaporator or condenser - Google Patents
Suction valve pulse width modulation control based on pressure of evaporator or condenser Download PDFInfo
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- CN101865551B CN101865551B CN2009101368715A CN200910136871A CN101865551B CN 101865551 B CN101865551 B CN 101865551B CN 2009101368715 A CN2009101368715 A CN 2009101368715A CN 200910136871 A CN200910136871 A CN 200910136871A CN 101865551 B CN101865551 B CN 101865551B
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- pressure
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Abstract
The invention relates to suction valve pulse width modulation control based on pressure of an evaporator or a condenser, which is used for a refrigerating system. The system comprises a suction pulse width modulation valve and pulse width modulation control for controlling the valve. System pressure of the pressure of the evaporator, the condenser and the like is monitored. The measured system pressure is kept in a region with an acceptable upper limit and an acceptable lower limit. When the pulse width modulation control enables the valve to circulate, refrigerant in the evaporator and the condenser tends to fluctuate. The control ensures the fluctuation to be within the limits by controlling the working cycle of the valve.
Description
Technical field
The application relates to a kind of pulse width modulation controlled that is used to suck pulse width modulated valve, and this pulse width modulated valve allows refrigeration system that continuous capacity or accurate stepwise capacity is provided, and wherein system pressure is monitored to confirm to be used for the optimum operation cycle of pulsewidth modulation.
Background technology
Refrigeration system is applied to such as in the plurality of applications of regulating environment.Air-conditioning and heat pump are used to cool off and/or heat the air that gets into environment.Cooling on this environment or heating load can change along with ambient conditions, and when the desired temperature of environment holder and/or humidity level change, change.Obviously, fully these variations of reflection of the operation of refrigeration system and control are with the domestic stable temperature and humidity condition of retaining ring.
A kind of method that is used to assist regulate the capacity of refrigeration system known in the prior art is to use pulse width modulation controlled.Known in the prior artly be, utilize pulse width modulation controlled to be used to control the valve that cold-producing medium flows through refrigeration system with circulation promptly, thus and pondage.Through the refrigerant flow of this system of restricted passage, this capacity can be reduced under the full capacity of system's operation.
A challenge by using pulse width modulation controlled to cause in the prior art is; Although this technology provides better controlled to capacity really, the system pressure on the refrigeration system possibly have the great fluctuation process of not expecting between the On/Off position that sucks pulse width modulated valve.If valve opens in the long time period or cuts out, for example the pressure on condenser and the evaporimeter possibly fluctuate very big.This pressure oscillation do not expect, possibly make the operation that is difficult to control expansion valve possibly make the steady temperature that keeps in the environment to be cooled become more difficult, and the total system operation more poor efficiency that possibly become.
On the other hand, if valve circulates to reduce pressure oscillation too continually, exist so and be in the enable possition from valve and change relevant extraneoas loss to valve system in the closed position.In addition, the probability of defective valve will increase owing to a large amount of circulations.
In the control of another suggestion that is used for the HVAC system, through element being separated and making the element of separation return to the pulse width modulation controlled that contacts the pulsewidth modulation that is provided for rolling element each other with the mode of pulsewidth modulation.This control will be monitored the pressure and temperature on suction (low pressure) side, and regulate the operation cycle of pulsewidth modulation.Yet this disclosed control does not seek to make fluctuation to minimize especially, and control sucks pulse width modulated valve, and does not have the state on discharge (high pressure) side of monitoring system yet.
Summary of the invention
In disclosed embodiment of the present invention, pulse width modulation controlled is provided, be used for optionally changing refrigerant flow from the downward flows of evaporimeter to compressor.Through sucking the refrigerant flow of pulse width modulated valve, can change the capacity that provides by refrigeration system through control.The signal of this at least one system pressure of control monitoring indication, and guarantee the pressure overshoot boundary that do not fluctuate.Can select to suck the operation cycle of pulse width modulated valve, remain in these boundaries to guarantee pressure oscillation.In disclosed embodiment, at condenser or evaporimeter place or at condenser and evaporimeter place monitoring system pressure.If pressure oscillation is near boundary, the cycling rate that will suck pulse width modulated valve so is adjusted to and remains in the regulation boundary.On the other hand, as long as pressure oscillation in boundary, then can not need the cycling rate of control valve.One of effective method that is used to reduce pressure oscillation is the cycling rate that increases valve.Yet, can change other parameters, such as the opening and closing time of for example valve, to realize the result of expectation.
Cycling rate can be regulated based on following factor: the degree that the temperature and humidity parameter in the operating condition, environment to be cooled is kept, the reliability restriction of magnetic valve, efficiency goal, system's thermal inertia, stability factor or the like.Perhaps, can use some Self Adaptive Control, wherein the variation in the pressure that will how to cause being detected of the variation in this control " study " operation cycle.It will be appreciated by those skilled in the art that how this control is provided.
Can understand these and further feature of the present invention better through description and accompanying drawing, wherein, attached drawings is a brief description.
Description of drawings
Fig. 1 is the sketch map that combines refrigeration system of the present invention.
Fig. 2 is the chart of the time VS pressure of pulse width modulation controlled, comprising the system pressure along with the time.
The specific embodiment
The pressure relevant (detecting) and all be sent to controller 35 with evaporimeter 30 relevant pressure (detecting) by sensor 32 by sensor 26 with condenser 24.Controller 35 is able to programme to realize following advantage.
As shown in Figure 2, suck pulse width modulated valve 34 and control by pulsewidth modulation.When sucking pulse width modulated valve 34 circulation opening and closing, pulse width modulation controlled will cause crest P and trough V.In disclosed embodiment, sucking pulse width modulated valve 34 is the magnetic valves that can circulate rapidly.The present invention changes the time that operation cycle or crest P and trough V exist.
Fig. 2 also illustrates system pressure, and this system pressure can be the pressure of being monitored by sensor 26 or pressure sensor 32.In disclosed embodiment, can monitor two pressure, therefore following disclosed control can be used for both.Capping U
LWith lower limit L
LPressure is remained in the border that is set by these two boundaries.At the downside place (sensor 32) probably located to be different from high side (sensor 26) in this border.Therefore, controller 35 monitor force and guarantee that pressure is between this boundary.As long as pressure is between boundary, then valve is with slower rate loop, and still realizes the capacity of expectation.When pressure oscillation near boundary, suck pulse width modulated valve 34 with higher rate loop, this will reduce pressure oscillation.
Will be understood that from Fig. 2 in the regional X on the system pressure chart, one in the pressure near boundary U
LAnd L
LOperation cycle or longer with the time of trough V existence at opening of valves crest P when closing.Yet when controller 35 detected pressure oscillation and becomes excessive (shown in regional X top), operation cycle reduced, and makes the shorter time period of crest and trough maintenance.Through shortening opening of valves and the time period of closing, pressure oscillation diminishes, shown in the downstream of regional X.Therefore, the present invention has realized having the suction pulse width modulated valve control of pulsewidth modulation, and has solved the problem of above-mentioned pressure oscillation.In addition, the present invention's pressure or cold-producing medium of also monitoring high side is being compressed the pressure of position.Prior art is mostly just paid close attention to suction pressure, therefore control ability of the present invention can not be provided.
In another characteristic, control can be Self Adaptive Control, variation in its " memory " operation cycle that the past provided and the variation that in system pressure, causes.Therefore, this control can " be learnt " with controlled pressure fluctuation better, and obtains to be in the system pressure on the aspiration level.Through attempting different cycling rates to confirm that which will produce best result in the constraint that applies (the for example largest loop rate of valve), this control can also seek optimal path so that the pulse width modulated valve circulation.
In addition, it must be noted that the inlet valve of pulsewidth modulation can have and full open position and complete corresponding opening in closed position and closed condition, this provides extra flexibility in system's control and operation.
Pulse width modulation controlled is known, and the valve of being operated by pulse-width signal also is known.The present invention utilizes these known technology to realize above-mentioned target and advantage with unique mode.
Although disclose the preferred embodiments of the present invention, those skilled in the art will recognize that some improvement will belong in the scope of the present invention.Therefore, should study claim to confirm true scope of the present invention and content.
Claims (10)
1. refrigeration system, it comprises:
Compressor is positioned at the condenser in said compressor downstream, is positioned at the expansion gear in said condenser downstream, and the evaporimeter that is positioned at said expansion gear downstream;
Suck pulse width modulated valve, it is between said evaporimeter and said compressor; And
Controller; It is used for optionally operating said suction pulse width modulated valve cold-producing medium is sent to said compressor; Said controller can be operated to utilize pulse-width signal to operate the suction pulse width modulated valve; And the operation cycle of said pulse-width signal is controlled to control the fluctuation on the system pressure that is detected
Wherein, Be said system pressure capping and lower limit; The said system pressure of controller monitoring remains in the said upper limit and the said lower limit to guarantee said system pressure; Said controller is regulated the said operation cycle of said suction pulse width modulated valve, remains between the said upper limit and the said lower limit to guarantee said system pressure
Wherein, if said system pressure then changes said operation cycle, so that said valve is held open and cuts out near one in the said upper limit and the said lower limit in the shorter time period.
2. refrigeration system according to claim 1 is characterized in that, said system pressure is relevant with said compressor.
3. refrigeration system according to claim 2 is characterized in that, said system pressure is also relevant with said evaporimeter.
4. refrigeration system according to claim 1 is characterized in that, said system pressure is relevant with said evaporimeter.
5. refrigeration system according to claim 1 is characterized in that, said suction pulse width modulated valve can be in full open position and opened between the closing position fully, and is movable to the centre position.
6. method of controlling refrigeration system, it comprises step:
Compressor is provided, at the condenser in said compressor downstream, at the expansion gear in said condenser downstream, in the evaporimeter and the suction pulse width modulated valve between said evaporimeter and said compressor in said expansion gear downstream; With
Optionally operate said suction pulse width modulated valve; Cold-producing medium is sent to said compressor; Through utilizing pulse-width signal operating said suction pulse width modulated valve, and combine, control the operation cycle of said pulse-width signal with the system pressure that is detected; To guarantee that the said system pressure that is detected does not exceed fluctuation margin
Wherein, Be said system pressure capping and lower limit; Monitoring said system pressure remains in the said upper limit and the said lower limit to guarantee said system pressure; And carry out the said operation cycle of the said suction pulse width modulated valve of said adjusting, remain between the said upper limit and the said lower limit to guarantee said system pressure
Wherein, if said system pressure near one in the said boundary, then said operation cycle reduces, and makes said valve in the shorter time period, be held open and close.
7. method according to claim 6 is characterized in that, said system pressure is relevant with said condenser.
8. method according to claim 7 is characterized in that, said system pressure is also relevant with said evaporimeter.
9. method according to claim 6 is characterized in that, said system pressure is relevant with said evaporimeter.
10. refrigeration system according to claim 6 is characterized in that, said suction pulse width modulated valve can be in full open position and opened between the closed position fully, and is movable to the centre position.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101368715A CN101865551B (en) | 2009-04-14 | 2009-04-14 | Suction valve pulse width modulation control based on pressure of evaporator or condenser |
| HK11103940.2A HK1149793A1 (en) | 2009-04-14 | 2011-04-19 | Suction valve pulse width modulation control based on evaporator or condenser pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101368715A CN101865551B (en) | 2009-04-14 | 2009-04-14 | Suction valve pulse width modulation control based on pressure of evaporator or condenser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101865551A CN101865551A (en) | 2010-10-20 |
| CN101865551B true CN101865551B (en) | 2012-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101368715A Active CN101865551B (en) | 2009-04-14 | 2009-04-14 | Suction valve pulse width modulation control based on pressure of evaporator or condenser |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101865551B (en) |
| HK (1) | HK1149793A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104457074B (en) * | 2014-11-24 | 2017-01-11 | 广东芬尼克兹节能设备有限公司 | Heat pump control method based on interval management |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6393852B2 (en) * | 1995-06-07 | 2002-05-28 | Copeland Corporation | Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor |
| CN1375640A (en) * | 2002-04-17 | 2002-10-23 | 浙江大学 | Pressure-reducing and flow rate-increasing swtich liquid pressure source with oil returning back pressure |
| EP1515047A2 (en) * | 1998-08-25 | 2005-03-16 | Copeland Corporation | Compressor capacity modulation |
-
2009
- 2009-04-14 CN CN2009101368715A patent/CN101865551B/en active Active
-
2011
- 2011-04-19 HK HK11103940.2A patent/HK1149793A1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6393852B2 (en) * | 1995-06-07 | 2002-05-28 | Copeland Corporation | Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor |
| EP1515047A2 (en) * | 1998-08-25 | 2005-03-16 | Copeland Corporation | Compressor capacity modulation |
| CN1375640A (en) * | 2002-04-17 | 2002-10-23 | 浙江大学 | Pressure-reducing and flow rate-increasing swtich liquid pressure source with oil returning back pressure |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平11-270916A 1999.10.05 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101865551A (en) | 2010-10-20 |
| HK1149793A1 (en) | 2011-10-14 |
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