CN115978885A - Control method of variable frequency fan of refrigerator - Google Patents
Control method of variable frequency fan of refrigerator Download PDFInfo
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- CN115978885A CN115978885A CN202211534131.9A CN202211534131A CN115978885A CN 115978885 A CN115978885 A CN 115978885A CN 202211534131 A CN202211534131 A CN 202211534131A CN 115978885 A CN115978885 A CN 115978885A
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- evaporator
- rotating speed
- refrigerator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Devices That Are Associated With Refrigeration Equipment (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
Abstract
The invention discloses a control method of a variable frequency fan of a refrigerator, wherein the fan is used for promoting the release of cold energy of an evaporator of the refrigerator and controlling the rotating speed of the fan according to the temperature difference between an inlet and an outlet of the evaporator. The invention controls the rotating speed of the fan by the temperature difference value of the inlet and the outlet of the evaporator, reflects the state of a refrigerant in the evaporator, namely the invention controls the cold output of the evaporator according to the state of the refrigerant in the evaporator, and undoubtedly enables the evaporator to maintain the optimal heat exchange effect under various environment temperatures.
Description
Technical Field
The invention relates to a household refrigerator, in particular to a control method of a variable frequency fan of a refrigerator.
Background
In the prior art, in a control system of a variable frequency refrigerator, the control rule of a fan is that the rotating speed of the fan is controlled according to the frequency of a compressor or by the control rule the same as that of the compressor, and the gears of the fan correspond to the gears of the compressor one to one.
The fan is arranged above the evaporator and used for promoting the cold energy of the evaporator to be released into the box, and the heat exchange efficiency of the evaporator is influenced by the fast and slow rotating speed of the fan.
Disclosure of Invention
In order to avoid the defects of the prior art, the invention aims to provide a control method of a variable frequency fan of a refrigerator, so that the heat exchange efficiency of an evaporator can achieve the optimal matching effect under different environment temperatures.
The purpose of the invention is realized by the following technical scheme: a control method of a variable frequency fan of a refrigerator is used for promoting the release of the cold energy of an evaporator of the refrigerator, and is characterized in that the rotating speed of the fan is controlled according to the temperature difference between an inlet and an outlet of the evaporator.
The temperature difference between the inlet and the outlet of the evaporator reflects the state of the refrigerant in the evaporator, and the invention directly controls the cold output of the evaporator (realized by controlling the rotating speed of the fan) according to the state of the refrigerant in the evaporator, thereby undoubtedly enabling the evaporator to maintain the optimal heat exchange effect under various environment temperatures.
If the fan continuously operates at the same rotating speed for a period of designated time and the compressor of the refrigerator stops, the fan is controlled to operate at a lower first-gear rotating speed, and the step can avoid frequent short-time starting of the compressor and is beneficial to prolonging the service life of the compressor.
The control method further comprises the following steps: and controlling the rotating speed of the fan according to the condensing pressure of the condenser of the refrigerator.
The condensing pressure reflects the flow of the refrigerant, the condensing pressure increases, the flow of the refrigerant entering the evaporator increases, the corresponding fan speed should also increase, and conversely, the fan speed decreases. The present invention adds this step to the purpose of making it possible to more quickly respond to changes in ambient temperature, changes in the internal temperature of the tank, etc., which are more sensitively reflected in the condensing pressure.
When the compressor is powered on for the first time, the fan is controlled to run at the maximum gear rotating speed.
The specific way of controlling the rotating speed of the fan according to the temperature difference value of the inlet and the outlet of the evaporator is as follows:
the inlet temperature of the evaporator is T1, the outlet temperature of the evaporator is T2, the temperature difference delta T = T2-T1 at two positions, whether the delta T is smaller than a first preset value A or not is judged, and if yes, the rotating speed of the fan is increased by 1 gear;
judging whether the delta T is larger than a second preset value B or not, if so, reducing the rotating speed of the fan by 1 gear;
b is greater than A, and the thresholds A and B are used for controlling the state of the refrigerant in the evaporator and preventing incomplete evaporation or conversion of the refrigerant into a superheated gaseous state.
The specific way of controlling the rotation speed of the fan according to the condensing pressure of the condenser of the refrigerator is as follows:
judging whether P is smaller than a third preset value C, if so, reducing the rotating speed of the fan by 1 gear;
judging whether P is larger than a fourth preset value D, if so, increasing the rotating speed of the fan by 1 gear;
d is greater than C.
Has the advantages that:
1) The invention controls the rotating speed of the fan by the temperature difference value of the inlet and the outlet of the evaporator, reflects the state of a refrigerant in the evaporator, namely the invention controls the cold output of the evaporator according to the state of the refrigerant in the evaporator, and undoubtedly enables the evaporator to maintain the optimal heat exchange effect under various environment temperatures.
2) The invention adds the step of controlling the rotating speed of the fan according to the condensing pressure of the condenser of the refrigerator, thereby leading the control method of the invention to react more quickly to the change of the environmental temperature, the change of the temperature in the refrigerator and the like (the changes can react on the condensing pressure more sensitively).
Drawings
Fig. 1 is a flow chart diagram of a control method of the preferred embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The refrigerator in the embodiment is configured as follows, and comprises at least one refrigerating chamber or one freezing chamber, at least one temperature sensor arranged in a compartment (the compartment is the refrigerating chamber and the freezing chamber in a general term), at least two temperature sensors arranged on an evaporator, at least one ambient temperature sensor, at least one pressure sensor, at least one variable frequency fan, at least one compressor and at least one condenser. The variable frequency fan is arranged above the evaporator and used for releasing the cold energy of the evaporator into the compartment. The compartment temperature sensor is used for acquiring the current temperature of the compartment; the evaporator temperature sensor is used for acquiring the current temperature of an inlet and an outlet of the evaporator; the environment temperature sensor is used for acquiring the current environment temperature; the condenser pressure sensor is used for acquiring the current condensing pressure.
Generally, a compressor is started when the refrigerator starts to be powered on, or after the temperature of the refrigerator exceeds a set temperature range after the compressor stops operating for a certain time, the refrigerator automatically controls the compressor to start operating, thereby starting the compressor.
In this embodiment, the rotation speed of the variable frequency fan is divided into 7 stages, and the rotation speed difference between different stages is 100rpm. In the running process of the compressor, the temperature difference between the inlet and the outlet of the evaporator is obtained through the evaporator temperature sensor, the condensing pressure is obtained through the condenser pressure sensor, and then the fan is controlled to run at a corresponding rotating speed according to the temperature difference between the inlet and the outlet of the evaporator and the condensing pressure. And if the fan continuously operates at the same rotating speed for a specified time and the compressor stops, controlling the variable frequency fan to operate at a lower first-gear rotating speed.
As shown in fig. 1, which is a schematic flow chart of a control method of a variable frequency fan of a refrigerator in this embodiment, it can be seen that the control method includes the following steps:
1) Starting a compressor;
2) Judging whether the power is firstly powered on:
if so, the fan runs at a preset rotating speed and is usually set to be at a maximum gear;
if not, entering the next step;
3) Judging whether the last running time of the compressor is longer than a preset time, such as 5min;
if yes, the fan operates at the rotating speed when the fan is stopped for the last time, and the next step is carried out;
if not, the rotating speed of the fan is reduced by one gear when the fan is stopped for the last time, and the next step is carried out;
4) Acquiring the inlet temperature T1 of an evaporator, the outlet temperature T2 of the evaporator and the pressure P of a condenser every time the fan operates for a preset time, such as 1min, and calculating the temperature difference delta T = T2-T1 between the two positions;
5) Judging whether the delta T is smaller than a first preset value A or not, if so, increasing the rotating speed of the fan by 1 gear, and returning to the step 4);
judging whether the delta T is larger than a second preset value B or not, if so, reducing the rotating speed of the fan by 1 gear, and returning to the step 4);
judging whether P is smaller than a third preset value C, if so, reducing the rotating speed of the fan by 1 gear, and returning to the step 4);
and (4) judging whether P is greater than a fourth preset value D, if so, increasing the rotating speed of the fan by 1 gear, and returning to the step 4).
And step 3) is used for avoiding the frequent short-time starting of the compressor, and is beneficial to prolonging the service life of the compressor.
In the step 5), B is larger than A, and D is larger than C.
The threshold values A and B are set for controlling the outlet temperature of the evaporator to be consistent with the inlet temperature of the evaporator, so that the optimal heat exchange effect of the evaporator is maintained. In this example, a = -1, b = -1. The outlet temperature is lower than the inlet temperature, which indicates that the refrigerant is not completely evaporated and needs to be enhanced for heat exchange; the outlet temperature of the evaporator is higher than the inlet temperature by more than 1 ℃, a part of refrigerant in the evaporator is converted into superheated gas, the specific volume of the refrigerant under the superheated gas is increased rapidly, the heat exchange area of the evaporator is occupied, the heat exchange effect is reduced, and the heat exchange of the evaporator needs to be reduced.
When the condensing pressure P increases, the flow rate of the refrigerant entering the evaporator increases, and the corresponding fan speed also increases, whereas the fan speed decreases. The threshold values C and D are set so that the rotating speed of the fan can be optimally matched with the flow rate of the refrigerant.
The invention adjusts the rotating speed of the fan by the cooperation of the delta T and the P, although the change of the pressure of the condenser can affect the flow of the refrigerant, the feedback of the temperature difference delta T of the inlet and the outlet of the evaporator has certain hysteresis, the feedback can react in advance by matching with the setting of the P value, and then the control is carried out by the setting of the delta T, so that the heat exchange condition of the evaporator can be controlled more accurately.
When setting the third preset value C and the fourth preset value D, the loop temperature Tam and the type of the refrigerant should be considered. Taking R600a refrigerant as an example, C, D suggest the following configuration: c =0.1758 (Tam + 20) 2 +0.65*(Tam+20)+207.09，D＝0.1758*(Tam+24) 2 +0.65*(Tam+24)+207.09。
The invention adjusts the rotating speed of the fan through the temperature of the inlet and the outlet of the evaporator and the pressure of the condenser, so that the heat exchange efficiency of the evaporator can achieve the optimal matching effect under different environment temperatures.
The present invention is not limited to the above embodiments, and various other equivalent modifications, substitutions and alterations can be made without departing from the basic technical concept of the invention as described above, according to the common technical knowledge and conventional means in the field.
Claims (6)
1. A control method of a variable frequency fan of a refrigerator, wherein the fan is used for promoting the release of cold energy of an evaporator of the refrigerator, and is characterized in that the rotating speed of the fan is controlled according to the temperature difference between an inlet and an outlet of the evaporator.
2. The control method as set forth in claim 1, wherein if the compressor of the refrigerator is stopped while the fan is continuously operated at the same rotation speed for a designated time, the fan is controlled to be operated at a lower first gear rotation speed.
3. The control method according to claim 1 or 2, characterized by further comprising the steps of: and controlling the rotating speed of the fan according to the condensing pressure of the condenser of the refrigerator.
4. A control method according to claim 3, characterised in that the fan is controlled to run at maximum gear speed when the compressor is first powered up.
5. The control method according to claim 3, wherein the rotation speed of the fan is controlled according to the temperature difference between the inlet and the outlet of the evaporator by:
the inlet temperature of the evaporator is T1, the outlet temperature of the evaporator is T2, the temperature difference delta T = T2-T1 at two positions, whether the delta T is smaller than a first preset value A or not is judged, and if yes, the rotating speed of the fan is increased by 1 gear;
judging whether the delta T is larger than a second preset value B or not, if so, reducing the rotating speed of the fan by 1 gear;
b is greater than A, and the thresholds A and B are used for controlling the state of the refrigerant in the evaporator and preventing incomplete evaporation or conversion of the refrigerant into a superheated gaseous state.
6. The control method according to claim 3, wherein the rotation speed of the fan is controlled according to the condensing pressure of the condenser of the refrigerator by:
judging whether P is smaller than a third preset value C, if so, reducing the rotating speed of the fan by 1 gear;
judging whether P is larger than a fourth preset value D, if so, increasing the rotating speed of the fan by 1 gear;
d is greater than C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211534131.9A CN115978885A (en) | 2022-12-02 | 2022-12-02 | Control method of variable frequency fan of refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211534131.9A CN115978885A (en) | 2022-12-02 | 2022-12-02 | Control method of variable frequency fan of refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115978885A true CN115978885A (en) | 2023-04-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211534131.9A Pending CN115978885A (en) | 2022-12-02 | 2022-12-02 | Control method of variable frequency fan of refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115978885A (en) |
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2022
- 2022-12-02 CN CN202211534131.9A patent/CN115978885A/en active Pending
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