CN101650064A - Low-temperature refrigeration air conditioner and wind speed control method thereof - Google Patents
Low-temperature refrigeration air conditioner and wind speed control method thereof Download PDFInfo
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- CN101650064A CN101650064A CN 200810147066 CN200810147066A CN101650064A CN 101650064 A CN101650064 A CN 101650064A CN 200810147066 CN200810147066 CN 200810147066 CN 200810147066 A CN200810147066 A CN 200810147066A CN 101650064 A CN101650064 A CN 101650064A
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Abstract
The invention discloses a low-temperature refrigeration air conditioner and a wind speed control method thereof. The low-temperature refrigeration air conditioner comprises a wind speed control deviceof an outdoor unit fan. The wind speed fan control device comprises a temperature detection unit, a fan control unit and the outdoor unit fan, wherein the temperature detection unit detects the temperature of a condenser of the air conditioner so as to obtain a simulated condensation temperature; the fan control unit generates control signals of the rotation speed change and on-off of the fan according to the simulated condensation temperature; and the outdoor unit fan responds to the control signals of the fan control unit and generates corresponding outdoor unit wind speed. The method for controlling the wind speed of the low-temperature refrigeration air conditioner controls the rotation speed change and on-off of the fan by simulating the condensation temperature of the condenser so as to provide different wind speeds for an outdoor unit. Because of simulating a pressure signal by detecting a temperature signal, the air conditioner and the method avoid direct contact between a wind speed control system and a refrigerant system so as to avoid leakage.
Description
Technical field
The present invention relates to a kind of low-temperature refrigeration air conditioner and wind speed control method thereof.
Background technology
Along with the raising of people's living standard, the R410A convertible frequency air-conditioner of energy-conserving and environment-protective has demand widely in countries such as Europe, and especially some countries of Northern Europe require air-conditioning except common refrigeration, heat-production functions, can also realize the cryogenic refrigeration requirement.
For realizing the cryogenic refrigeration function, generally adopt the wind speed controller, the wind speed controller is connected with the refrigerant system, controls the outdoor fan wind speed by the operating pressure of detection system, thereby guarantees that machine moves under suitable condensation temperature.
In the process of implementing technical solution of the present invention, the inventor finds that the subject matter that prior art exists is: the wind speed controller is installed in the refrigerant pipeline, because variations in temperature is easy to generate leakage.
For the less relatively off-premises station of volume, the space that the wind speed controller is installed is little in addition, and maintenance is inconvenient, and simultaneously owing to the output voltage that has changed by the wind speed controller to motor, motor is easy to generate heating and damages.
And cooling and warming is generally same rotating speed, owing to outdoorly when heating have condensed water to condense, windage is strengthened, and outer machine rotating ratio refrigeration reduces, thereby has weakened outdoor heat exchange, and heating effect is reduced.
Summary of the invention
The object of the present invention is to provide a kind of low-temperature refrigeration air conditioner and wind speed control method thereof, with system's secondary refrigerant leakage problem of avoiding using the wind speed controller to bring.
For reaching this purpose, one aspect of the present invention provides a kind of low-temperature refrigeration air conditioner, comprises the wind speed control device of off-premises station, and this wind speed control device comprises: temperature detecting unit, carry out temperature detection to the condenser of air-conditioning, to obtain the simulation condensation temperature; The blower fan control module according to the simulation condensation temperature, produces the control signal of rotation speed of fan variation and start-stop; And the off-premises station blower fan, the control signal of response blower fan control module produces corresponding off-premises station wind speed.
Wherein, temperature detecting unit is the temperature sensor of sampling condenser middle part temperature.
The present invention provides a kind of wind speed control method of low-temperature refrigeration air conditioner on the other hand, utilizes temperature detecting unit, and the condenser of described low-temperature refrigeration air conditioner is carried out temperature detection, to obtain the simulation condensation temperature; Utilize the blower fan control module,, produce the control signal of rotation speed of fan variation and start-stop according to detected simulation condensation temperature; Utilize the off-premises station blower fan, the control signal of response blower fan control module produces corresponding off-premises station wind speed.
According to a preferred embodiment of the invention, adopt dc fan, by the temperature T cm at sampling condenser middle part, the condensation temperature of simulation condenser by the rotating speed of the outer blower fan of simulation condensation temperature Tcm control, realizes the rotation speed change and the start-stop of dc fan.Reasonably working under the condensation temperature to guarantee machine.To realize the cryogenic refrigeration function.Owing to come the simulated pressure signal by the detected temperatures signal, avoid wind speed control system directly to contact with the refrigerant system, avoided the possibility of leaking.
The wind speed differentiation that the while wind speed control method of low-temperature refrigeration air conditioner of the present invention has been realized refrigeration, heated is not fully exerted efficiency of motor, has improved the performance of low-temperature heating.Because the performance of blower fan is relevant with serviceability temperature, along with the rising of environment temperature, the heat radiation of blower fan self descends, because the restriction of wind scale temperature rise, so the environment for use temperature is high more, the maximum speed that dc fan can reach is low more.And when heating because outdoor environment temperature is lower, so the good heat dissipation effect of blower fan, blower fan is corresponding can to arrive high rotational speed.Maximum speed can improve than the maximum speed of refrigeration, and according to this characteristic, by E2 and program setting, with refrigeration and the high wind speed that heats separately, a unified like this motor can freeze, all perform to when heating optimum state.Thereby effectively raise the heating effect of machine.
Can on the 3P machine case, improve according to air-conditioning of the present invention, in order to realize modularization and standardization such as motor, computer plate, press, realizing by dial-up that the outer machine wind speed of 3P, 4P is distinguished (the 3P refrigeration, heats high wind speed and is respectively 5 grades, 6 grades, 4P refrigeration, the high wind speed that heats are respectively 6 grades, 7 grades), thus the standardization level of off-premises station improved.
Be noted that the description and the following detailed description all are exemplary, are intended for the requested to provide further explanation of the invention.
Except purpose described above, feature and advantage, the present invention also has other purpose, feature and advantage, below with reference to figure, other purpose, feature and effect of the present invention is described in further detail.
Description of drawings
Constitute this specification a part, be used for further understanding structural representation of the present invention and illustrate preferred embodiment and be used for illustrating principle of the present invention with explanation.Among the figure:
Fig. 1 shows the structural representation of existing low-temperature refrigeration air conditioner;
Fig. 2 is the partial enlarged drawing of low-temperature refrigeration air conditioner shown in Figure 1;
Fig. 3 shows the structural representation figure of low-temperature refrigeration air conditioner according to the preferred embodiment of the invention;
Fig. 4 is the partial enlarged drawing of low-temperature refrigeration air conditioner shown in Figure 3;
Fig. 5 shows the structured flowchart according to the wind speed control device of off-premises station of the present invention;
Fig. 6 shows the flow chart according to the wind speed control method of low-temperature refrigeration air conditioner of the present invention; And
Fig. 7 shows the wind speed adjustment process under the cryogenic refrigeration condition of the wind speed control method according to the present invention.
The specific embodiment
The present invention is described in detail below in conjunction with accompanying drawing and preferred embodiment.
Fig. 1 shows the structural representation of existing low-temperature refrigeration air conditioner, and Fig. 2 shows the partial enlarged drawing of low-temperature refrigeration air conditioner shown in Figure 1.As shown in the figure, existing air-conditioning adopts AC blower fan and wind speed controller, the wind speed controller is connected with the refrigerant system, by detecting pressure at expulsion, pressure signal is converted into the signal of telecommunication, regulate the voltage that is input on the motor, thereby realize regulating rotation speed of fan and blower fan start-stop, realize cryogenic refrigeration to guarantee condensing pressure.
Fig. 3 shows the structural representation of low-temperature refrigeration air conditioner according to the preferred embodiment of the invention, and Fig. 4 shows the partial enlarged drawing of low-temperature refrigeration air conditioner shown in Figure 3.As shown in the figure, low-temperature refrigeration air conditioner of the present invention mainly comprises: compressor, dc fan, exhaust sensor Td, high-pressure switch, cross valve, vapour liquid separator, gas side three-way cut-off valve, evaporimeter, liquid side three-way cut-off valve, filter, electric expansion valve, condenser, defrosting sensor (detecting the temperature T e of condenser), condenser middle part sensor (detecting the temperature T cm of condenser), ring temperature sensor (testing environment temperature T ao).As shown in the figure, in the present embodiment, detect and simulate condensation temperature with condenser middle part sensor.
Fig. 5 shows the wind speed control device of off-premises station according to invention, and as shown in the figure, this wind speed control device comprises: temperature detecting unit 10, carry out temperature detection to the condenser of air-conditioning, to obtain the simulation condensation temperature; Blower fan control module 20 according to the simulation condensation temperature, produces the control signal of rotation speed of fan variation and start-stop; And off-premises station blower fan 30, the control signal of response blower fan control module produces corresponding off-premises station wind speed.Preferably, the off-premises station blower fan certainly, also can be driven by alternating current generator by direct current generator or private clothes motor-driven.The blower fan control module can comprise that single-chip microcomputer or Programmable Logic Controller realize, in the present invention, is realized by the air-conditioner controller that hardware such as computer plate are formed.
Fig. 6 shows the wind speed control method according to low-temperature refrigeration air conditioner of the present invention.This method comprises: step S10 obtains simulating condensation temperature by temperature detecting unit to the detection of condenser; Step S20 blower fan control module is controlled rotation speed of fan according to the simulation condensation temperature and is changed and start-stop; And, step S30 off-premises station blower fan, the control signal of response blower fan control module produces corresponding off-premises station wind speed.
In a preferred embodiment, the simulation condensation temperature obtains the detection of condenser by sensor Tcm in the middle part of the condenser that contacts with condenser that is fixed on the condenser middle part.Because the heat exchange existence can make the temperature of this sensor and the condensation temperature of condenser reach unanimity, and the resistance of sensor Tcm is along with variations in temperature, because variations in temperature, can cause the resistance of Tcm to change, when the resistance difference that detects Tcm, the computer board chip will send different control instructions, and the blower fan wind speed is changed or start-stop.
In other optional embodiment, the simulation condensation temperature can also realize by the temperature T e (temperature of the sensor that promptly defrosts) that detection enters the temperature T ci of condenser and goes out condenser, be about to enter the condensation temperature Tc of the mean value of the temperature T ci of condenser and the temperature T e that goes out condenser, promptly simulate condensation temperature Tc=(Tci+Te)/2 as the simulation condenser.By the rotating speed of the outer blower fan of simulation condensation temperature Tc control, realize the rotation speed change and the start-stop of dc fan, reasonably working under the condensation temperature to guarantee machine.
Below the wind speed adjustment process is described.
At first, set the control progression of dc fan for 0 to 7 grade, each controls the corresponding blower fan revolution of progression as shown in Table 1:
In compressor start 8 minutes, come controlled wind speed according to environment temperature, as shown in Table 2:
| Environment temperature | ??～15 | ??15～25 | ??25～ |
| Refrigeration, dehumidifying | 1 grade | 4 grades | 6 grades |
| Heat | 7 grades | 4 grades | 2 grades |
The compressor start when the cryogenic refrigeration function, was controlled the rotating speed of off-premises station blower fan after 8 minutes according to simulation condensation temperature Tcm.Control content: A, guarantee high heat exchange efficiency as far as possible; B, limit minimum condensing pressure value (compressor requirement).Control parameter: condenser middle part sensor temperature Tcm.Wherein:
Concrete control procedure as shown in Figure 7, if environment temperature Tao＞30 ℃ or Tcm＞43 ℃ (E), the refrigeration wind speed is output as 6 grades.If environment temperature Tao in other scope, then controls according to simulation condensation temperature Tcm.
When 35 ℃ of (E)≤Tcm≤40 ℃ (E), wind speed keeps.As Tcm＜35 ℃ (E), then one-level falls in the wind speed of off-premises station blower fan, and Tcm＞40 ℃ (E), then the wind speed of off-premises station blower fan rises one-level, and rotation speed of fan is minimum in the time of each grade stop to be 30 seconds.
After Tcm＜25 ℃ (E) continues 30 minutes, (after press is opened 8 minutes, begin to judge timing), then shut down, restart after 3 minutes, do not report to the police.
The press start when heat-production functions, was adjusted according to environment temperature and press frequency after 8 minutes, as shown in Table 3:
More than be that example describes with 4P (AU362AHERA), in whole operation process (remove manually adjust wind speed in specified, the forced process after), for 4P, the high wind speed that freezes is 6 grades, heating high wind speed is 7 grades.For 3P (AU282AHERA), the high wind speed that freezes is 5 grades, heats the high wind speed of 3P and be 6 grades (are frequency greater than 45HZ, requiring wind speed is 7 grades, actual output wind speed is 6 grades).In addition, above-mentioned each temperature value is just in order to illustrate, in concrete application scenario, this temperature value can be revised.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. low-temperature refrigeration air conditioner comprises it is characterized in that the wind speed control device of off-premises station,
Described wind speed control device comprises:
Temperature detecting unit carries out temperature detection to condenser, to obtain the simulation condensation temperature;
The blower fan control module according to the simulation condensation temperature, produces the control signal of rotation speed of fan variation and start-stop; And
The off-premises station blower fan, the control signal of response blower fan control module produces corresponding off-premises station wind speed.
2. low-temperature refrigeration air conditioner according to claim 1 is characterized in that,
Described temperature detecting unit is the temperature sensor of sampling condenser middle part temperature.
3. low-temperature refrigeration air conditioner according to claim 1 is characterized in that,
Described blower fan control module is an air-conditioner controller.
4. according to each described low-temperature refrigeration air conditioner in the claim 1 to 3, it is characterized in that,
Described off-premises station blower fan is the direct current drive blower fan.
5. the wind speed control method of a low-temperature refrigeration air conditioner is characterized in that,
Utilize temperature detecting unit that the condenser of described low-temperature refrigeration air conditioner is carried out temperature detection, to obtain the simulation condensation temperature;
Utilize the blower fan control module,, produce the control signal of rotation speed of fan variation and start-stop according to detected simulation condensation temperature;
Utilize the off-premises station blower fan, the control signal of response blower fan control module produces corresponding off-premises station wind speed.
6. wind speed control method according to claim 5 is characterized in that,
Described temperature detecting unit is simulated the condensation temperature of condenser by the temperature at sampling condenser middle part.
7. wind speed control method according to claim 5 is characterized in that,
Described temperature detecting unit enters condenser temperature and goes out condenser temperature by detection, enters condenser temperature and the described mean value that goes out condenser temperature obtains to simulate condensation temperature with described.
8. according to each described wind speed control method in the claim 5 to 7, it is characterized in that,
The wind speed of described off-premises station blower fan is set at some progression from low to high.
9. wind speed control method according to claim 8 is characterized in that,
Make described off-premises station blower fan when refrigeration high wind speed correspondence progression less than the progression of high wind speed correspondence when heating.
10. wind speed control method according to claim 8 is characterized in that,
Make the wind speed progression of described off-premises station blower fan come optionally to determine according to the condensation temperature or the environment temperature of simulation condenser.
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