CN1204030A - Apparatus and method for preventing evaporator for air conditioning system from freezing - Google Patents
Apparatus and method for preventing evaporator for air conditioning system from freezing Download PDFInfo
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- CN1204030A CN1204030A CN 98102971 CN98102971A CN1204030A CN 1204030 A CN1204030 A CN 1204030A CN 98102971 CN98102971 CN 98102971 CN 98102971 A CN98102971 A CN 98102971A CN 1204030 A CN1204030 A CN 1204030A
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Abstract
A method for preventing an evaporator of an air conditioner from freezing comprises the steps of detecting an outdoor temperature; determining whether or not the outdoor temperature is 20 DEG C; determining whether or not the outdoor temperature is in a first temperature range; determining whether or not the outdoor temperature is in a second temperature range; varying an R.P.M. of the motor assembly based on the outdoor temperature detected; detecting a surface temperature of a condenser and determining whether or not the surface temperature of the condenser is in a third temperature range; repeating above steps if the surface temperature of the condenser is higher than the third temperature range; and rotating the motor assembly at a low speed if the surface temperature of the condenser is lower than the third temperature range. The apparatus is advantageous in that the apparatus constantly maintains the internal pressure of the evaporator by varying the R.P.M. of the motor assembly according to the outdoor temperature and surface temperature of the condenser, thereby preventing the evaporator of the air-conditioning system from freezing.
Description
The present invention relates to a kind of air-conditioning system, or rather, relate to a kind of apparatus and method that prevent that evaporimeter freezes in the air-conditioning system.
Air-conditioning system is a kind of device that comes cool room inside by the air that cooled dose heat of evaporation cooling is provided.
Usually, air-conditioning system have a compressor, one at high temperature and high pressure lower compression cold-producing medium by cooling the condenser, one of high-temperature high-pressure gas refrigerant liquefaction are used at the liquid refrigerant divided gas flow cold-producing medium that infeeds from condenser in case infeed the receiving tank of expansion valve and one be used to evaporate through expansion valve and make its pressure reduce and produce thus the evaporimeter of the spraying liquid cold-producing medium of cold air.
In this air-conditioning system, when this system is powered, compressor operating, so cold-producing medium is compressed into high-temperature high-pressure state.Then this high-temperature high-pressure refrigerant is supplied with condenser, and this cold-producing medium is blown over next air cooling by fan.The cold-producing medium that is liquefied in condenser expands by expansion valve, and the atomizing cold-producing medium that expands is inhaled into evaporimeter.Be inhaled into the cold-producing medium evaporation of evaporimeter, and evaporator surface is cooled off by air.Because evaporimeter absorbs its heat on every side by the heat of evaporation of cold-producing medium, therefore the cooling aciculiform fin that forms in evaporator external is cooled.At this moment, extraneous air is cooled off by evaporimeter through passing through fan, infeeds in the room then.
Yet, be lower than 0 ℃ or when externally having the bigger temperature difference between air and the inner air, evaporator surface is easy to frosting on the surface of evaporimeter.In addition, in No. the 4531378th, United States Patent (USP), disclose the device that the device surface that avoids evaporating freezes, a choke valve has been housed in this device, be used to control the evaporimeter pressure inside, so that the device surface that avoids evaporating is icing.
Fig. 1 is the structural representation of traditional air-conditioning system, and Fig. 2 is mounted in the sectional view of the choke valve in the traditional air-conditioning system.As shown in the figure, this air-conditioning system has a cam 105 that is used for giving air-conditioning system with the energy that the motor (not shown) transmits or blocks energy, one links to each other with cam 105 and to be used for cold-producing medium being compressed into high temperature and high pressure gas and having the compressor 110 of a displacement variation device by piston, a condenser 120 that is used for condensation from the high temperature and high pressure gaseous refrigerant of compressor 110, isolate gas in the liquid refrigerant of an always self cooling condenser 120 and this liquid refrigerant is offered the receiving tank 140 of expansion valve 150, one is used to evaporate atomizing cold-producing medium from receiving tank 140 so that absorb the evaporimeter 160 of ambient heat, and one be installed in and be used to control refrigerant pressure so that the choke valve 170 that the surface of the device 160 that avoids evaporating freezes between evaporimeter 160 and the compressor 110.
When the internal pressure of evaporimeter 160 raise or reduce, choke valve 170 maintained the internal pressure of evaporimeter 160 on the predetermined pressure, so that device 160 surfaces that avoid evaporating freeze.
The inlet 173 of choke valve 170 links to each other with evaporimeter 160, and the outlet 175 of choke valve 170 links to each other with compressor 110.Choke valve 170 has 172, one diaphragms 174 of spring that are installed in its internal upper part branch and links to each other with an end of spring 172, and valve body 176 links to each other with an end of diaphragm 174.
If the cooling load of evaporimeter 160 is lower, the internal pressure of evaporimeter 160 is also lower.Therefore the refrigerant pressure that flows into choke valve 170 is lower.So the elastic force of choke valve 170 springs 172 is greater than the pressure that flows through the cold-producing medium that comes from evaporimeter, so valve body 176 moves down.Thereby valve body 176 blocks the pipeline 177 that flows into cold-producing medium, flows into compressor 110 so that prevent cold-producing medium.Therefore, evaporimeter 160 internal pressures raise, and evaporimeter 160 pressure inside are maintained on the pressure of being scheduled to.Therefore, choke valve 170 avoids the temperature of evaporimeter 160 to drop to below 0 ℃, has prevented freezing of air-conditioning system evaporimeter thus.
On the other hand, if the cooling load of evaporimeter 160 rises, the internal pressure of evaporimeter 160 also rises.Like this, the pressure that flows into the cold-producing medium of choke valve 170 also rises.Therefore, the elastic force of the spring 172 of choke valve 170 is less than the pressure of the cold-producing medium that flows out from evaporimeter 160, so valve body 176 moves up.So pipeline is opened, and cold-producing medium is inhaled in the compressor 110.Therefore, evaporimeter 160 pressure inside are maintained on the pressure of being scheduled to.Therefore, choke valve 170 avoids the temperature of evaporimeter 160 to drop to below 0 ℃, freezes so that prevent air-conditioning system evaporimeter 160.
On the other hand, be provided with a sensor that is used to detect choke valve 170 valve body positions.This sensor 180 detects valve body 176 motion up and down, and sends signal to control section 145.Control section 145 links to each other with a displacement variation device 190 of compressor 110.These control section 145 receptions are used for the displacement variation device 190 of drive compression machine 110 from the signal of sensor 180.Therefore, compressor 110 is controlled compression volume according to the cooling load of evaporimeter 160, freezes so that prevent air-conditioning system evaporimeter 160.
Yet, because the device that the air-conditioning system evaporimeter freezes from being to prevent to freeze from the pressure that evaporimeter flows into the cold-producing medium of compressor by detection in traditional preventing, therefore, regulate because the cooling load that temperature difference causes between room air and the outdoor air is difficult.
The present invention is devoted to address the above problem.In general, when the temperature of evaporator surface was lower than 0 ℃, the surface of evaporimeter froze.Therefore the purpose of this invention is to provide the apparatus and method that a kind of device that avoids evaporating freezes, wherein this device according to outdoor temperature with variable speed drive fan, drive condenser and keep the internal pressure of evaporimeter consistently, freeze so that prevent the air-conditioning system evaporimeter.
In order to achieve the above object, the invention provides a kind of device that prevents that the air-conditioning system evaporimeter from freezing, this device comprises:
A fan that is used for blowing air that is positioned at the condenser front to condenser;
First temperature sensor that is used to detect outdoor temperature and produces one first signal;
One is used to second temperature sensor that detects the condenser surface temperature and produce a secondary signal;
One receives first and second signals from first and second temperature sensors, and produce the control section that a control signal changes the rotating speed (R.P.M.) of motor assembly according to first and second signals, described motor assembly links to each other with fan, is used to rotate this fan; And
One is used for receiving control signal from control section, and adjust the frequency that power supply is supplied with according to this control signal, so that provide a frequency converter through adjusted frequency to motor assembly, wherein, when outdoor temperature is higher than first predetermined temperature, control section produces first control signal, with the high speed rotary fan, when outdoor temperature was lower than first predetermined temperature, control section produced second control signal, with the middling speed rotary fan, and when the surface temperature of condenser is lower than second predetermined temperature, control section produces one the 3rd control signal, with the low speed rotation fan, keeps the condenser pressure inside thus consistently.
According to the present invention, control section determines whether outdoor temperature is 20 ℃, and the speed rotary fan that control section can be variable, therefore keeps the internal pressure of condenser consistently.When outdoor temperature surpassed 20 ℃, control section determined that outdoor temperature is whether in first temperature range.In the time of in outdoor temperature is in first temperature range, control section is with normal speed drive motors assembly.And when outdoor temperature surpassed first temperature range, control section was with the high-speed driving motor assembly.
When outdoor temperature was lower than 20 ℃, control section determined whether outdoor temperature is in second temperature range.In the time of in outdoor temperature is in second temperature range, control section is with middling speed drive motors assembly.And when outdoor temperature was lower than second temperature range, control section was with the driven at low speed motor assembly.
When the surface temperature of condenser surpassed 50 ℃, control section was with normal speed drive motor assembly, and when the temperature of condenser surface was lower than 50 ℃, control section was with the driven at low speed motor assembly.First temperature range is 20-40 ℃, and second temperature range is 15-20 ℃.In addition, first and second temperature sensors are a kind of resistance-type temperature detection sensors.
Another object of the present invention provides a kind of method that prevents that the air-conditioning system evaporimeter from freezing, and this method comprises the steps:
(1) in normal speed drive motors assembly, detects outdoor temperature with first temperature sensor;
(2) determine whether outdoor temperature is 20 ℃;
(3), determine that then outdoor temperature is whether in first temperature range if detected outdoor temperature is higher than 20 ℃ in (2) step;
(4), determine that then outdoor temperature is whether in second temperature range if detected outdoor temperature is lower than 20 ℃ in (2) step;
(5) according to the R.P.M of the outdoor temperature that in (3) and (4) step, detects change motor assembly;
(6) whether the surface temperature that detects the surface temperature of condenser and determine condenser is in the 3rd temperature range;
(7) if the surface temperature of condenser is higher than the 3rd temperature range, repeating step (1) is to (6);
(8) if the surface temperature of condenser is lower than the 3rd temperature range, with the low speed rotation motor assembly.
According to this method, if outdoor temperature is higher than first temperature range, (3) step has a substep with the high-speed rotary motor assembly, if outdoor temperature is in first temperature range, will return step (1).In step (4), if outdoor temperature is in second temperature range, with middling speed electric rotating machine assembly.
In step (4), if outdoor temperature is lower than second temperature range, with the low speed rotation motor assembly.
This first temperature range is 20-40 ℃, and second temperature range is 15-20 ℃, and the 3rd temperature range is 50-52 ℃.
Another purpose of the present invention provides a kind of method that prevents that the air-conditioning system evaporimeter from freezing, and this method comprises the following steps:
(1) in the drive motors assembly, detects outdoor temperature with first temperature sensor;
(2) determine whether outdoor temperature is in first predetermined temperature;
(3) if the outdoor temperature that detects in step (2) is higher than first predetermined temperature, with normal speed electric rotating machine assembly;
(4) if the outdoor temperature that detects is lower than first predetermined temperature, stop the operation of motor assembly in step (2);
(5) surface temperature of detection condenser;
(6) whether the surface temperature of determining condenser is second predetermined temperature;
(7) if the surface temperature of the condenser that detects in step (6) is higher than second predetermined temperature, with normal speed electric rotating machine assembly; And
(8) if the surface temperature of the condenser that detects is lower than second predetermined temperature, stop the operation of motor assembly in step (6).
First predetermined temperature is 20 ℃, and second predetermined temperature is 50 ℃.
This prevents that the advantage of the device that the air-conditioning system evaporimeter freezes is that this device keeps the internal pressure of evaporimeter consistently, it is constant that the R.P.M that it changes motor assembly by the surface temperature according to outdoor temperature and condenser keeps the internal pressure of evaporimeter, and prevent that thus the air-conditioning system evaporimeter from freezing.
Above-mentioned purpose of the present invention and advantage will describe preferred embodiment in detail and clearer by the reference accompanying drawing, wherein:
Fig. 1 is the structural representation of traditional air-conditioning system;
Fig. 2 is mounted in the sectional view of the choke valve in the traditional air-conditioning system;
Fig. 3 is the structural plan figure of air-conditioning system of the present invention;
Fig. 4 is the block diagram of first embodiment of air-conditioning system anti-icing equipment of the present invention;
Fig. 5 is the flow chart of first embodiment of air-conditioning system anti-icing equipment of the present invention;
Fig. 6 is the block diagram of second embodiment of air-conditioning system anti-icing equipment of the present invention;
Fig. 7 is the flow chart of second embodiment of air-conditioning system anti-icing equipment of the present invention.
Explain the preferred embodiments of the present invention below with reference to accompanying drawings in detail.
Fig. 3 is the sectional view of the structure of air-conditioning system 300.As shown in Figure 3, air-conditioning system 300 is separated by casing 302 and outside.This air-conditioning system 300 comprises: a motor assembly 335 that has first and second blower fan 330 and 340 at bilateral; A compressor 305 that is used for cold-producing medium is compressed into HTHP; A condenser 310 that is used for cooling down high-temperature high-pressure gaseous refrigerant and this cold-producing medium that liquefies; First temperature sensor 315 that is used to detect outdoor temperature and produces first signal; Thereby a liquid refrigerant that is used to aspirate from condenser 310 makes it absorb the evaporimeter that heat on every side also cools off air thus by low pressure refrigerant that receiving tank and expansion valve also evaporate atomizing; Second temperature sensor 325 that links to each other and be used to detect the surface temperature of condenser and produce secondary signal with an end of condenser 310; And one be used to receive by first and second temperature sensors 315 and 325 first and second signals that produce so that with the control section (not shown) of variable speed electric rotating machine assembly 335.
Fig. 4 is the block diagram according to the device of first embodiment of the invention.As shown in the figure, control section 345 links to each other with second temperature sensor 325 with first temperature sensor 315, wherein first temperature sensor detects outdoor temperature, and send first signal to control section 345, and second temperature sensor detects the surface temperature of condenser 310, and sends secondary signal to control section 345.This control section 345 receives by first and second temperature sensors 315 and 325 first and second signals that produce, and this control section 345 transmits control signals to frequency converter 355, so as according to around temperature with variable speed electric rotating machine assembly.The control signal that this frequency converter 355 produces according to control section 345 is adjusted by power supply and is applied to frequency on the motor assembly 335.
Therefore, control section 345 is according to coming electric rotating machine assembly 335 changeably by first and second temperature sensors 315 and 325 outdoor temperature or the evaporator surface temperature that detect.
When air-conditioning system 300 was connected power supply, control section 345 sent control signal to frequency converter 355, and frequency converter 355 applies the frequency of adjusting and motor assembly 335 again.In addition, control section 345 receives the outdoor temperature that is detected by first temperature sensor 315, and whether definite outdoor temperature is 20 ℃.
When the outdoor temperature that detects when first temperature sensor 315 surpassed 20 ℃, control section 345 determined that outdoor temperatures are whether between 20-40 ℃.
When outdoor temperature was between 20-40 ℃, because the cooling load of chamber adjusting system 300 is in normal load condition, therefore, control section 345 transmitted signal and gives frequency converter 355, with normal speed electric rotating machine assembly 335.Therefore, the air that is blown by fan 330 (Fig. 3) has cooled off the surface of evaporimeter 310, thereby by cooling evaporimeter 310, the internal pressure of evaporimeter 310 is maintained on the predetermined pressure.Evaporimeter 320 is applied predetermined pressure, and the internal pressure of evaporimeter 320 maintains also on this predetermined pressure, the surface temperature of evaporimeter 320 maintains more than 0 ℃ like this, has avoided the air-conditioning system evaporimeter to freeze thus.
When outdoor temperature surpassed 20-40 ℃, because the cooling load of air-conditioning system 300 is in the state of excess load, the output of compressor 305 increased, and was under the HTHP by the cold-producing medium that compressor 305 offers condenser 310.In addition, because condenser 310 pressure inside should be maintained under the predetermined pressure, control section 345 is with high-speed rotary motor assembly 335.Control section 345 sends control signal to frequency converter 335, so that with high-speed rotary motor assembly 335.Frequency converter 355 imposes on motor assembly 335 with the frequency of 120Hz, with the high-speed rotary motor assembly.Therefore, condenser 310 is cooled with predetermined temperature, and is maintained under the predetermined pressure by the high-temperature high-pressure refrigerant of condenser 310 inside.Cold-producing medium is circulated to evaporimeter 320, and the internal pressure of evaporimeter 320 is maintained on the predetermined pressure.Like this, the surface temperature of evaporimeter 320 maintains more than 0 ℃, has prevented that thus the air-conditioning system evaporimeter from freezing.
When outdoor temperature was lower than 20 ℃, control section 345 determined that outdoor temperatures are whether between 15-20 ℃.
When outdoor temperature was in 15-20 ℃, air-conditioning system was in the low load condition lower than normal condition.The output of compressor 305 is lowered with respect to overload state.The cold-producing medium of supplying with condenser 310 from compressor 305 is low-temperature condition with respect to overload state.Therefore, control section 345 sends control signal to frequency converter 355, so that with middling speed electric rotating machine assembly.Frequency converter 355 imposes on motor assembly 335 with the frequency of 40-50Hz again, with middling speed electric rotating machine assembly 335.Control section 345 is with middling speed electric rotating machine assembly 335, and therefore, the cold-producing medium by condenser 310 inside is maintained on the predetermined pressure.This cold-producing medium is circulated to evaporimeter 320, and the internal pressure of evaporimeter 320 also maintains on the predetermined pressure, so the surface temperature of evaporimeter 320 maintains more than 0 ℃, has prevented that thus the air-conditioning system evaporimeter from freezing.
When outdoor temperature was lower than 15-20 ℃, the load of air-conditioning system was lower than the load of outdoor temperature in the time of 15-20 ℃.Therefore, the output of compressor 305 is lower than the 15-20 ℃ of output under the situation, and the temperature that is offered the cold-producing medium of condenser 310 by compressor 305 is compared low with lower load condition.Control section 345 transmits control signal so that with the low speed rotation motor assembly.Frequency converter 355 provides the frequency of 30Hz to motor assembly 335, so that with low speed rotation motor assembly 335.Control section 345 is with the low speed rotation motor assembly, and feasible cold-producing medium by condenser 310 inside maintains on the predetermined pressure.Cold-producing medium is recycled to evaporimeter 320, and the internal pressure of evaporimeter 320 maintains under the predetermined pressure, and the surface temperature of evaporimeter 320 maintains more than 0 ℃ like this, has avoided the air-conditioning system evaporimeter to freeze thus.
On the other hand, control section 345 receives the surface temperature of condenser by second temperature sensor 325, so that change the R.P.M. of motor assembly 335.Condenser 310 is most effective in the time of 50 ℃.
When the surperficial Continuous Contact of air that blows out from fan 330 and condenser 310, the surface temperature of condenser 310 rises or descends.
Like this, control section 345 should maintain the surface temperature of condenser 310 50 ℃.So control section 345 determines whether the surface temperature of condenser 310 is 50 ℃.When the surface temperature of condenser 310 rises and during greater than 50 ℃, control section 345 is with normal speed electric rotating machine assembly 330, the result makes the surface temperature of condenser 310 maintain 50 ℃.Yet when the surface temperature of condenser 310 was lower than 50 ℃, control section 345 was with low speed rotation motor assembly 330, and the result makes the surface temperature of condenser 310 maintain 50 ℃.
3 and 5 the method that prevents among first embodiment that the air-conditioning system evaporimeter from freezing is described in more detail below with reference to accompanying drawings.
Fig. 3 is the plane of an evaporation structure of the present invention, and Fig. 5 is the flow chart of the method that prevents that the air-conditioning system evaporimeter from freezing.
The present invention prevents that the method that the air-conditioning system evaporimeter freezes from may further comprise the steps:
(1) in normal speed drive motors assembly, detects outdoor temperature with first temperature sensor;
(2) determine whether outdoor temperature is 20 ℃;
(3), determine that outdoor temperature is whether in first temperature range if the outdoor temperature that detects is higher than 20 ℃ in step (2);
(4), determine that outdoor temperature is whether in second temperature range if the outdoor temperature that detects is lower than 20 ℃ in step (2);
(5) according to the R.P.M. of the outdoor temperature that in step (3) and (4), records change motor assembly;
(6) whether the surface temperature that detects the surface temperature of condenser and determine condenser is in the 3rd temperature range;
(7) if the surface temperature of condenser is higher than the 3rd temperature range, repeating step (1)-(6);
(8) if the surface temperature of condenser is lower than the 3rd temperature range, with the low speed rotation motor assembly.
Normal speed refers to the R.P.M. of the motor assembly when the frequency of power supply is 60Hz, middling speed refers to the R.P.M. of the motor assembly of supply frequency when being 40-50Hz, low speed refers to the R.P.M. of the motor assembly of supply frequency when being 30Hz, refers to the motor assembly R.P.M. of supply frequency when being 120Hz at a high speed.
In step (1) S510, when connecting power supply for air-conditioning system 300, control section 345 sends signal to frequency converter 355, so that electric rotating machine assembly 335.Frequency converter 355 is adjusted to 60Hz with frequency, and the frequency of 60Hz is imposed on motor assembly 335, so that with normal speed electric rotating machine assembly.In addition, control section 345 receives the outdoor temperature that is detected by first temperature sensor.
In step (2) S520, control section 345 receives first signal that is detected by first temperature sensor 315, and control section 345 determines that whether outdoor temperature is at 20 ℃.
In step (3) S530, when outdoor temperature was 20-40 ℃, because cooling load is in the normal duty state, control section 345 sent signal to frequency converter 355, so that with normal speed electric rotating machine assembly 335.Frequency converter 355 is adjusted to normal 60Hz by the signal that control section 345 produces with frequency, and the 60Hz frequency is imposed on motor assembly 335, so that with normal speed electric rotating machine assembly 335.Therefore, the air that blows out from fan 330 is with the surface of predetermined temperature cooling evaporimeter, and the cooling of the internal pressure of condenser 310 by condenser 310 maintains more than the predetermined pressure.Apply predetermined pressure for evaporimeter 320, the internal pressure of evaporimeter 320 is maintained on this predetermined pressure, so the surface temperature of evaporimeter 320 thus, has prevented that the air-conditioning system evaporimeter from freezing greater than 0 ℃.
In step (4) S540, when outdoor temperature was lower than 20 ℃, control section 345 determined that outdoor temperatures are whether between 15-20 ℃.
In step (5) S550, when outdoor temperature was higher than 20-40 ℃, because the cooling load of air-conditioning system 300 is in overload state, the output of compressor 305 increased, and the cold-producing medium of supplying with condenser 310 by compressor 305 is in high-temperature high-pressure state.Therefore, owing to condenser 310 internal pressures should maintain on the predetermined pressure, so control section 345 passes through with predetermined pressure cooler condenser 310, with high-speed rotary motor assembly 335.Control section 345 carries control signal for frequency converter 355, so that with high-speed rotary motor assembly 335.Frequency converter 355 applies the frequency of 120Hz to motor assembly 335, with high-speed rotary motor assembly 335.Therefore, condenser 310 is cooled with predetermined temperature, and the high-temperature high-pressure refrigerant by condenser 310 inside is maintained on the predetermined pressure.Cold-producing medium is circulated to evaporimeter 320, and the internal pressure of evaporimeter 320 maintains on the predetermined pressure.Thereby the surface temperature of evaporimeter 320 is maintained at more than 0 ℃, has prevented that thus the air-conditioning system evaporimeter from freezing.
When outdoor temperature was 15-20 ℃, air-conditioning system was in low load condition.Therefore, lower with respect to the output of overload state compressor 305, the cold-producing medium of giving condenser 310 with respect to overload state compressor 305 is a low-temperature condition.Therefore control section 345 transmits control signal to frequency converter 355, and motor assembly is rotated with middling speed.Frequency converter 355 applies the frequency of 40-50Hz to motor assembly 335, with middling speed electric rotating machine assembly 335.Control section 345 is with middling speed electric rotating machine assembly 335, and the cold-producing medium by condenser 310 inside is maintained at predetermined pressure like this.Cold-producing medium is recycled to evaporimeter 320, and the internal pressure of evaporimeter 320 is maintained on the predetermined pressure, the surface temperature of evaporimeter 320 is maintained at more than 0 ℃ like this, has prevented that thus the air-conditioning system evaporimeter from freezing.
When outdoor temperature is lower than 15-20 ℃, to compare with the situation of outdoor temperature between 15-20 ℃, air-conditioning system is in lower load condition.Therefore, compare with low load condition, the output of compressor 305 is lower, compares with low load condition, and the cold-producing medium of supplying with condenser 310 from compressor 305 also is in lower temperature.Therefore, control section 345 is carried control signal, so that with the low speed rotation motor assembly.Frequency converter 355 applies the frequency of 30Hz to motor assembly 335, with low speed rotation motor assembly 335.Control section 345 is with low speed rotation motor assembly 335, and the cold-producing medium by condenser 310 inside is maintained on the predetermined pressure like this.Cold-producing medium is recycled to evaporimeter 320, and the internal pressure of evaporimeter 320 is also maintained on the predetermined pressure, the result maintains more than 0 ℃ the surface temperature of evaporimeter 320, has prevented that thus the air-conditioning system evaporimeter from freezing.
In step (6) S560, second temperature sensor 325 detects the surface temperature of condenser 310, so that transmit secondary signal to control section 345.Control section 345 receives secondary signal, and whether the surface temperature of definite condenser is 50 ℃.
In step (7) S570, when the surface temperature of condenser 310 was higher than 50 ℃, control section 345 turned back to first step S510.That is to say that control section 345 transmits signal to frequency converter 355, so that with normal speed electric rotating machine assembly 335.Frequency converter 355 is adjusted to 60Hz with frequency, and with normal speed electric rotating machine assembly 335.Like this, surface temperature is maintained at 50 ℃.
In step (8) S580, when the surface temperature of condenser 310 was lower than 50 ℃, control section 345 transmitted signal to frequency converter 355, so that with low speed rotation motor assembly 335.Frequency converter 355 is adjusted to 30Hz with frequency, the frequency of this 30Hz is imposed on motor assembly 335, so that with low speed rotation motor assembly 335.
6 and 7 describe the apparatus and method that the device that avoids evaporating among second embodiment freezes in detail below with reference to accompanying drawings.
As shown in the figure, control section 645 with detect outdoor temperature and produce first temperature sensor 615 of first signal and second temperature sensor 625 that detects condenser 610 surface temperatures and produce secondary signal links to each other.Control section 645 receives from first and second temperature sensors 615 and 625 first and second signals that receive, and control section 645 transmits control signals to switch 630, so as according to around temperature with variable speed electric rotating machine assembly 635.By the control signal that is produced by control section 645, switch 630 is connected the power supply of motor assembly 635.
As mentioned above, control section 645 receives the surface temperature of outdoor temperature or condenser 610 from first and second temperature sensors 625 and 625, so that control the R.P.M. of motor assembly 635.
When connecting the power supply of air-conditioning system 600, control section 645 electric rotating machine assemblies 635, and by first temperature sensor, 615 detection outdoor temperatures.Control section 645 determines that whether outdoor temperature is at 20 ℃.
When outdoor temperature was higher than 20 ℃, control section 645 transmitted signal to switch 630, so that connect the power supply of motor assembly 635, and motor assembly operation like this.
When outdoor temperature was lower than 20 ℃, control section 645 transmitted signal to switch 630, the motor assembly 635 that stops the rotation, and the surface temperature of detection condenser 610.And when the surface temperature of condenser 610 was lower than 50 ℃, control section 645 kept motor assembly 635 halted states.When the surface temperature of condenser 610 is higher than 50 ℃, control section 645 electric rotating machine assemblies 635.
Fig. 7 is the flow chart that prevents the method that the air-conditioning system evaporimeter freezes in the second embodiment of the invention.
This method that prevents that the air-conditioning system evaporimeter from freezing may further comprise the steps: (1) is in the drive motors assembly, detect outdoor temperature with first temperature sensor, (2) determine whether outdoor temperature is first predetermined temperature, (3) if the outdoor temperature that detects in step (2) is higher than first predetermined temperature, with normal speed electric rotating machine assembly, (4) if the outdoor temperature that detects in step (2) is lower than first predetermined temperature, stop the operation of motor assembly, (5) surface temperature of detection condenser, (6) whether the surface temperature of determining condenser is second predetermined temperature, (7) if the surface temperature of the condenser that detects in step (6) is higher than second predetermined temperature, with normal speed electric rotating machine assembly, and (8) keep the halted state of motor assembly if the condenser surface temperature that detects is lower than second predetermined temperature in step (6).
In step (1) S610, when giving when preventing that device that the air-conditioning system evaporimeter freezes from connecting power supply, control section 645 transmits signals to switch 630, so that electric rotating machine assembly 635.And the signal rotation motor assembly 635 that switch 630 produces according to control section 645.In addition, control section 645 is by the outer temperature signal of first temperature sensor, 615 receiving chambers.
In step (2) S620, control section 645 receives first signal that first temperature sensor 615 produces, and whether definite outdoor temperature is 20 ℃.
In step (3) S630, when outdoor temperature was higher than 20 ℃, control section 645 transmitted signal to switch 630, so that make motor assembly 635 connect power supply, the electric rotating machine assembly 635 thus.Therefore, the air-cooled condenser surface that fan blows out, and the internal pressure of condenser 610 is maintained on the predetermined pressure by this cooling.This predetermined pressure is offered evaporimeter 620, and the internal pressure of evaporimeter 620 is maintained on this predetermined pressure, evaporator surface temperature rises to more than 0 ℃ like this, has prevented that thus the air-conditioning system evaporimeter from freezing.
In step (4) S640, when outdoor temperature was lower than 20 ℃, control section 645 transmitted signal to switch 630, so that cut off the power supply that imposes on motor assembly 635.Like this, be stopped operation by this signal motor assembly 635.
In step (5) S650, control section receives the surface temperature of the condenser that is detected by second temperature sensor 625.In step (6) S660, control section determines whether the surface temperature of condenser is 50 ℃.
In step (7) S680, when the surface temperature of condenser 610 was higher than 50 ℃, control section 645 transmitted control signal to switch 630, and switch 630 makes motor assembly 635 connect power supply.By 635 rotations of control signal motor assembly, the surface temperature of condenser 610 is maintained at 50 ℃ like this.
In step (8) S670, when outdoor temperature was lower than 50 ℃, control section 645 transmitted control signal to switch 630, so that continuous cutting-off is supplied with the power supply of motor assembly 635.Owing to maintain state out of service by control signal motor assembly 635, the surface temperature of condenser 610 is maintained at 50 ℃.
As above-mentioned embodiment was described, when evaporator surface temperature was lower than 0 ℃, evaporator surface froze.When evaporator surface was frozen, refrigerating efficiency reduced.Therefore the temperature that need keep evaporator surface is higher than 0 ℃, freezes to prevent its surface.
The advantage that prevents the device that the air-conditioning system evaporimeter freezes is: this device changes the R.P.M. of motor assembly according to the surface temperature of outdoor temperature and condenser, can keep the internal pressure of evaporimeter consistently, the internal pressure of evaporimeter is constant like this, has prevented that thus the air-conditioning system evaporimeter from freezing.
Illustrate especially and describe the while of the present invention at the reference most preferred embodiment, be construed as in the spirit and scope of the present invention that do not exceed claim and limited, those of ordinary skill in the art can do various variations.
Claims (14)
1. device that prevents that A/C evaporator from freezing, this device comprises:
A fan that is used for blowing air that is positioned at the condenser front to condenser;
First temperature sensor that is used to detect outdoor temperature and produces one first signal;
One is used to second temperature sensor that detects the condenser surface temperature and produce a secondary signal;
One receives first and second signals from first and second temperature sensors, and produces the control section that a control signal changes the rotating speed of motor assembly according to first and second signals, and described motor assembly links to each other with fan, is used to rotate this fan; And
One is used for receiving control signal from control section, and adjust the frequency that power supply is supplied with according to this control signal, so that provide a frequency converter through adjusted frequency to motor assembly, wherein, when outdoor temperature is higher than first predetermined temperature, control section produces first control signal, with the high speed rotary fan, when outdoor temperature was lower than first predetermined temperature, control section produced second control signal, with the middling speed rotary fan, and when the surface temperature of condenser is lower than second predetermined temperature, control section produces one the 3rd control signal, with the low speed rotation fan, keeps the condenser pressure inside thus consistently.
2. device as claimed in claim 1, wherein, when outdoor temperature was higher than 20 ℃, control section produced first control signal, and when outdoor temperature was lower than 20 ℃, control section produced second control signal.
3. device as claimed in claim 2, wherein, when outdoor temperature is higher than 20 ℃, control section determines that outdoor temperature is whether in first temperature range, in the time of in outdoor temperature is in first temperature range, with normal speed rotary fan, when outdoor temperature is higher than first temperature range, with the high speed rotary fan.
4. device as claimed in claim 3, wherein, when outdoor temperature is lower than 20 ℃, control section determines that outdoor temperature is whether in second temperature range, in the time of in outdoor temperature is in second temperature range, with the middling speed rotary fan, when outdoor temperature is lower than second temperature range, with the low speed rotation fan.
5. device as claimed in claim 4, wherein first temperature range is 20～40 ℃, second temperature range is 15～20 ℃.
6. device as claimed in claim 1, wherein, when the surface temperature of condenser was lower than 50 ℃, control section produced the 3rd control signal, and when the condenser surface temperature was higher than 50 ℃, control section produced the 4th control signal, with normal speed rotary fan.
7. device as claimed in claim 1, wherein first and second temperature sensors comprise the resistor-type temperature sensor.
8. method that prevents that A/C evaporator from freezing, this method comprises the steps:
(1) in normal speed drive motors assembly, detects outdoor temperature with first temperature sensor;
(2) determine whether outdoor temperature is 20 ℃;
(3), determine that outdoor temperature is whether in first temperature range if the outdoor temperature that detects is higher than 20 ℃ in step (2);
(4), determine that outdoor temperature is whether in second temperature range if the outdoor temperature that detects is lower than 20 ℃ in step (2);
(5) outdoor temperature of basis detection in step (3) and (4) changes the R.P.M of motor assembly;
(6) surface temperature of detection condenser, and whether the surface temperature of definite condenser is in the 3rd temperature range;
(7) if the surface temperature of condenser is higher than the 3rd temperature range, repeating step (1) is to (6); And
(8) if the surface temperature of condenser is lower than the 3rd temperature range, with the low speed rotation motor assembly.
9. method as claimed in claim 8, wherein step (3) comprises if outdoor temperature is higher than first temperature range with the high-speed rotary motor assembly, and if outdoor temperature be in first temperature range then return the substep of step (1).
10. method as claimed in claim 8, wherein, in step (4), if outdoor temperature is in second temperature range, then with middling speed electric rotating machine assembly.
11. method as claimed in claim 8, wherein, in step (4), if outdoor temperature is lower than second temperature range, then with the low speed rotation motor assembly.
12. method as claimed in claim 8, wherein first temperature range is 20～40 ℃, and second temperature range is 15～20 ℃, and the 3rd temperature range is 50～52 ℃.
13. prevent the method that A/C evaporator freezes, this method comprises the steps:
(1) in the drive motors assembly, detects outdoor temperature with first temperature sensor;
(2) detect outdoor temperature and whether be in first predetermined temperature;
(3) if the outdoor temperature that detects in step (2) is higher than first predetermined temperature, with normal speed electric rotating machine assembly;
(4) if the outdoor temperature that detects is lower than first predetermined temperature, stop the operation of motor assembly in step (2);
(5) surface temperature of detection condenser;
(6) whether the surface temperature of determining condenser is second predetermined temperature;
(7) if the surface temperature of the condenser that detects in step (6) is higher than second predetermined temperature, with normal speed electric rotating machine assembly; And
(8) if the surface temperature of the condenser that detects in step (6) is lower than second predetermined temperature, make motor assembly maintain stopped status.
14. method as claimed in claim 13, wherein first predetermined temperature is 20 ℃, and second predetermined temperature is 50 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98102971 CN1204030A (en) | 1997-06-28 | 1998-06-28 | Apparatus and method for preventing evaporator for air conditioning system from freezing |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR28559/97 | 1997-06-28 | ||
| KR28557/97 | 1997-06-28 | ||
| CN 98102971 CN1204030A (en) | 1997-06-28 | 1998-06-28 | Apparatus and method for preventing evaporator for air conditioning system from freezing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1204030A true CN1204030A (en) | 1999-01-06 |
Family
ID=5217662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98102971 Pending CN1204030A (en) | 1997-06-28 | 1998-06-28 | Apparatus and method for preventing evaporator for air conditioning system from freezing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1204030A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7579794B2 (en) | 2006-03-22 | 2009-08-25 | Asustek Computer Inc. | Fan system with hysteresis character and method thereof |
| CN1888646B (en) * | 2005-06-27 | 2010-05-12 | 乐金电子(天津)电器有限公司 | Variable frequency air conditioner and controlling method thereof |
| CN101213415B (en) * | 2005-02-02 | 2012-05-23 | 开利公司 | Heat Exchange systems |
| CN102865645A (en) * | 2011-07-08 | 2013-01-09 | 中国钢铁股份有限公司 | High-temperature air-cooled air conditioner and operation control method thereof |
| CN106052031A (en) * | 2016-06-21 | 2016-10-26 | 东莞市升微机电设备科技有限公司 | Frequency conversion control system and method for constant temperature and humidity device |
| CN109084429A (en) * | 2018-08-17 | 2018-12-25 | Tcl空调器(中山)有限公司 | Control method, air conditioner and the readable storage medium storing program for executing of air conditioner |
| CN109210699A (en) * | 2018-09-10 | 2019-01-15 | 青岛海尔空调器有限总公司 | The control method of air-conditioning anti-freeze protection |
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- 1998-06-28 CN CN 98102971 patent/CN1204030A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101213415B (en) * | 2005-02-02 | 2012-05-23 | 开利公司 | Heat Exchange systems |
| CN1888646B (en) * | 2005-06-27 | 2010-05-12 | 乐金电子(天津)电器有限公司 | Variable frequency air conditioner and controlling method thereof |
| US7579794B2 (en) | 2006-03-22 | 2009-08-25 | Asustek Computer Inc. | Fan system with hysteresis character and method thereof |
| CN102865645A (en) * | 2011-07-08 | 2013-01-09 | 中国钢铁股份有限公司 | High-temperature air-cooled air conditioner and operation control method thereof |
| CN102865645B (en) * | 2011-07-08 | 2014-08-20 | 中国钢铁股份有限公司 | High-temperature air-cooled air conditioner and operation control method thereof |
| CN106052031A (en) * | 2016-06-21 | 2016-10-26 | 东莞市升微机电设备科技有限公司 | Frequency conversion control system and method for constant temperature and humidity device |
| CN106052031B (en) * | 2016-06-21 | 2019-04-12 | 东莞市升微机电设备科技有限公司 | The frequency-changing control system and its method of the outdoor unit of thermostatic constant wet equipment |
| CN109084429A (en) * | 2018-08-17 | 2018-12-25 | Tcl空调器(中山)有限公司 | Control method, air conditioner and the readable storage medium storing program for executing of air conditioner |
| CN109210699A (en) * | 2018-09-10 | 2019-01-15 | 青岛海尔空调器有限总公司 | The control method of air-conditioning anti-freeze protection |
| CN109210699B (en) * | 2018-09-10 | 2020-11-27 | 青岛海尔空调器有限总公司 | Control method for anti-freezing protection of air conditioner |
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