CN101464033A - Antifreeze method and system for indoor unit of air conditioner - Google Patents

Abstract

The invention relates to an antifreeze method for an indoor unit of an air conditioner. The method includes: detecting the inlet temperature of the evaporator of the indoor unit, and if the detected temperature is lower than the first set temperature and the duration exceeds the first set time, command the air conditioner to enter the antifreeze In the protection mode, until the detected temperature is higher than the second set temperature and lasts for the second set time, the air conditioner is instructed to exit the antifreeze mode. The method further includes: if the detected temperature is lower than a third set temperature and lasts longer than a third set time, instructing the air conditioner to enter an antifreeze protection mode. In the present invention, if the air conditioning system is composed of an outdoor unit and an indoor unit, the antifreeze protection mode is to close the outdoor unit; if the air conditioning system is composed of an outdoor unit and at least two indoor units, some of the indoor units need antifreeze protection, and the antifreeze protection mode is Close the electronic expansion valves of some of the above indoor units. The invention can effectively solve the problem of freezing and water leakage of the indoor unit of the air conditioner in the cooling mode.

Description

Antifreeze method and antifreeze system for air conditioner indoor unit

technical field

The invention relates to the field of air conditioners, in particular to an antifreeze method and an antifreeze system for an air conditioner indoor unit.

Background technique

An air conditioner is one of our most commonly used household appliances. It uses a compressor to compress a refrigerant, and uses the refrigerant to absorb and release heat to achieve cooling and heating functions. Referring to Fig. 1, when the air conditioner is in cooling mode, the compressor 11 sucks low-temperature and low-pressure gas refrigerant, and after compression, the refrigerant becomes high-temperature and high-pressure saturated gas, which is sent to the condenser 12; the high-temperature and high-pressure saturated gas is in the condenser 12 After cooling, the pressure is kept constant, and heat is released to the outside, thereby condensing into a low-temperature and high-pressure liquid; the refrigerant is discharged from the condenser 12, and when it passes through the electronic expansion valve 13, the pressure drops due to obstruction, causing part of the refrigerant liquid to become a gas. At the same time, it absorbs the latent heat of vaporization to lower its own temperature and becomes low-temperature and low-pressure wet steam; it enters the indoor unit evaporator 14, and in the indoor unit evaporator 14, the refrigerant liquid absorbs the moisture in the air under the condition of constant pressure. The heat makes the surrounding air cool, and at the same time, the fan blows the cold air into the room to achieve the cooling effect.

During the cooling process of the indoor unit, the evaporation temperature of the refrigerant in the group coil of the indoor unit evaporator 14 is too low, which may easily cause the refrigerant liquid to freeze in the fins of the evaporator and the water receiving tray, causing problems such as freezing and water leakage of the indoor unit. In the current prior art, a temperature sensor is installed on the coil of the evaporator 14 of the indoor unit. When the temperature detected by the sensor is lower than the set temperature, the operation of the compressor 11 is automatically stopped or the electronic expansion valve 13 is closed to enter the anti-freeze protection. mode, the temperature of the refrigerant in the group coil of the indoor unit evaporator 14 rises to prevent the refrigerant liquid from freezing in the fins of the evaporator and the water receiving pan. When the temperature detected by the sensor temperature is higher than the set temperature, start the compressor 11 or open the electronic expansion valve 13 to resume the normal cooling mode.

In the prior art, when it is detected that the coil temperature of the evaporator 14 of the indoor unit is lower than the set temperature, it enters the antifreeze protection mode. If the set temperature is too high, the air conditioner will frequently enter the antifreeze protection mode, which will affect the cooling effect; If the set temperature is too low, the indoor unit will freeze and leak, but the air conditioner has not yet entered the antifreeze protection mode, which will have a bad influence on the user. Therefore, the existing antifreeze method for the indoor unit of an air conditioner has relatively single judgment conditions, and it is difficult to control the air conditioner to enter the antifreeze protection mode at an appropriate time, and cannot effectively solve the problem of water leakage caused by freezing of the indoor unit in the cooling mode.

Contents of the invention

The technical problem to be solved by the present invention is to provide an anti-freezing method for an air-conditioning indoor unit, which can effectively solve the problem of freezing and water leakage of the air-conditioning indoor unit in cooling mode.

Another object of the present invention is to provide an antifreeze system for an indoor unit of an air conditioner, which can effectively solve the problem of freezing and water leakage of the indoor unit of the air conditioner in cooling mode.

The present invention is an antifreeze method for an indoor unit of an air conditioner. The method includes: detecting the inlet temperature of the evaporator of the indoor unit. If the detected temperature is lower than the first set temperature and the duration exceeds the first set time, the air conditioner is instructed to enter antifreeze protection. mode, until the detected temperature is higher than the second set temperature and lasts for the second set time, command the air conditioner to exit the antifreeze mode.

Preferably, the method further includes: if the detected temperature is lower than the third set temperature and lasts longer than the third set time, instructing the air conditioner to enter the antifreeze protection mode.

Preferably, the method further includes: if the air conditioning system is composed of an outdoor unit and an indoor unit, the antifreeze protection mode is to turn off the outdoor unit.

Preferably, the method further includes: if the air conditioning system is composed of an outdoor unit and at least two indoor units, some of the indoor units need antifreeze protection, and the antifreeze protection mode is to close the electronic expansion valves of the above-mentioned part of the indoor units.

Preferably, the range of the first set temperature is minus 10 degrees to 0 degrees; the range of the first set time is 3 minutes to 15 minutes.

Preferably, the range of the second set temperature is 1 degree to 15 degrees; the range of the second set time is 5 minutes to 25 minutes.

Preferably, the range of the third set temperature is 0°C to 5°C; the range of the second set time is 20 minutes to 90 minutes.

The present invention also provides an antifreeze system for an indoor unit of an air conditioner, including a temperature sensor, a unit for entering the antifreeze mode, and a unit for exiting the antifreeze mode: the temperature sensor is arranged at the entrance of the evaporator of the indoor unit, and the detected temperature value sent to the first antifreeze protection unit entering and exiting the antifreeze protection unit; the first antifreeze protection unit for entering is used when the received temperature value is lower than the first set temperature and the duration exceeds the first set time , instructing the air conditioner to enter the antifreeze protection mode; the exit antifreeze mode unit is used to instruct the air conditioner to exit the antifreeze mode when the received temperature value is higher than the second set temperature in the antifreeze protection mode and lasts for the second set time.

Preferably, it also includes a second antifreeze protection unit, which receives the temperature value transmitted by the temperature sensor, and if the temperature value is lower than the third set temperature and lasts for the third set time, instructs the air conditioner to enter the antifreeze protection mode .

Preferably, if the air conditioning system is composed of an outdoor unit and an indoor unit, the antifreeze protection mode is to close the outdoor unit; if the air conditioning system is composed of an outdoor unit and at least two indoor units, some of the indoor units need antifreeze protection, and the antifreeze protection mode To close the electronic expansion valves of some of the indoor units mentioned above.

Compared with the prior art, the present invention has the following advantages:

The invention detects the inlet temperature of the indoor evaporator, and if the detected temperature is lower than the first set temperature and lasts longer than the first set time, the air conditioner is instructed to enter the antifreeze mode. Only when the internal temperature of the indoor unit evaporator is lower than a certain value and lasts for a certain period of time can the refrigerant liquid freeze in the evaporator fins and the water receiving pan. According to the operating power and operating environment of the air conditioner, the present invention reasonably adjusts the first set temperature and the first set time. Compared with the prior art, simply setting a fixed temperature will affect the performance of the air conditioner because the set temperature is too high or too low. Cooling effect and user use, the present invention can control the air conditioner to enter the antifreeze protection mode at a more appropriate time, effectively solving the problem of freezing and water leakage of the indoor unit of the air conditioner.

When the detected temperature is higher than the second set temperature and lasts for the second set time, the present invention instructs the air conditioner to exit the antifreeze mode, so as to avoid affecting the cooling effect due to the long time in the antifreeze mode of the air conditioner.

Description of drawings

Fig. 1 structural schematic diagram of existing air conditioner;

Fig. 2 is the schematic diagram of the air conditioning system of the present invention;

Fig. 3 is a flow chart of the antifreezing method for the air conditioner indoor unit provided by the first embodiment of the present invention;

Fig. 4 is a flow chart of the antifreezing method for the air conditioner indoor unit provided by the second embodiment of the present invention;

Fig. 5 is the schematic diagram of the air conditioning system of the present invention;

Fig. 6 is a schematic diagram of the antifreeze system of the air conditioner indoor unit provided by the first embodiment of the present invention;

Fig. 7 is a schematic diagram of the antifreeze system of the air conditioner indoor unit provided by the second embodiment of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to FIG. 2 , it is a schematic diagram of the air conditioning system of the present invention, including a compressor 11 , an outdoor unit 12 , an electronic expansion valve 13 , an indoor unit evaporator 14 , and a temperature sensor 15 . The temperature sensor 15 is arranged at the inlet of the indoor unit evaporator 14 to detect the intake air temperature of the indoor unit evaporator 14 .

In the cooling mode, the refrigerant is in a low-temperature liquid state and absorbs heat in the indoor unit evaporator 14 for cooling, and the temperature detected by the temperature sensor 15 at the inlet of the indoor unit evaporator 14 is generally relatively low. The temperature sensor 15 transmits the detected temperature to the processor. If the detected temperature is lower than the first set temperature and lasts longer than the first set time, the processor instructs the air conditioner to enter the antifreeze protection mode until the detected temperature If the temperature is higher than the second set temperature and lasts for the second set time, the processor instructs the air conditioner to exit the antifreeze protection mode.

The range of the first set temperature is minus 10 degrees to 0 degrees, preferably minus 3 degrees, and the range of the first set time is 3 minutes to 15 minutes, preferably 8 minutes. The range of the second set temperature is positive 1°C to 15°C, preferably 5°C, and the range of the second set time is 5 minutes to 25 minutes, preferably 15 minutes.

Now take a Haier air conditioner as an example to illustrate the above-mentioned technical solution of the present invention. Referring to Figure 3, the specific steps are as follows.

Step 301 , preset a first set temperature, a first set time, a second set temperature, and a second set time in a processor of the air conditioner. The first set temperature is minus 10 degrees, the first set time is 3 minutes, the second set temperature is plus 1 degree, and the second set time is 25 minutes.

Step 302, setting the temperature sensor 15 at the inlet of the evaporator of the indoor unit 14, detecting the inlet temperature of the evaporator 14 of the indoor unit, and sending the temperature value to the processor.

Step 303, the processor compares the received temperature with the first set temperature, if the detected temperature is higher than minus 3 degrees, the processor does not process; if the detected temperature is lower than minus 3 degrees, the processor starts timing, if If the detected temperature is lower than minus 3° for less than 8 minutes, the processor clears the timer; if the detected temperature is lower than minus 3° for more than 8 minutes, the processor generates a control command to make the air conditioner enter the antifreeze protection mode.

Step 304, in the antifreeze protection mode, the processor compares the received detected temperature with the second set temperature, if the detected temperature is lower than 1 degree, the processor does not process; if the detected temperature is higher than 1 degree, The processor starts timing. If the detected temperature is higher than 1 degree and lasts for no more than 25 minutes, the processor clears the timer; if the detected temperature is higher than 1 degree and lasts for more than 25 minutes, the processor generates a control command to make the air conditioner exit the antifreeze protection model.

Only when the internal temperature of the indoor unit evaporator 14 is lower than a certain value and lasts for a certain period of time, the refrigerant liquid may freeze in the evaporator fins and the water receiving tray. According to the operating power and operating environment of the air conditioner, the present invention reasonably adjusts the first set temperature and the first set time, so that the air conditioner can enter the antifreeze protection mode at a more appropriate time, and effectively solves the problem of icing and water leakage of the indoor unit of the air conditioner. When the detected temperature is higher than the second set temperature and lasts for the second set time, the present invention instructs the air conditioner to exit the antifreeze mode, so as to avoid affecting the cooling effect due to the long time in the antifreeze mode of the air conditioner.

The present invention can also set more conditions for the air conditioner to enter the antifreeze protection mode according to actual application conditions, so as to more effectively prevent the indoor unit of the air conditioner from freezing and water leakage. The present invention can add the 3rd set temperature and the 3rd set time, the scope of the 3rd set temperature is zero degree to 5 degrees, preferably 1 degree, the scope of the 3rd set time is 20 minutes to 90 minutes, preferably for 50 minutes. When the inlet temperature of the indoor unit evaporator 14 is lower than the third set temperature for more than the third set time, or lower than the first set temperature for more than the first set time, the air conditioner will enter the antifreeze protection mode. . Referring to Figure 4, the specific steps are as follows.

Step 401, preset a first set temperature, a first set time, a second set temperature, a second set time, a third set temperature, and a third set time in a processor of the air conditioner. The first set temperature is minus 3 degrees, the first set time is 8 minutes, the second set temperature is plus 5 degrees, the second set time is 15 minutes, the third set temperature is 1°, the third set The set time is 50 minutes.

Step 402, setting the temperature sensor 15 at the inlet of the indoor unit evaporator 14, detecting the inlet temperature of the indoor unit evaporator 14, and sending the temperature value to the processor.

Step 403, the processor compares the received temperature with the first set temperature, if the detected temperature is higher than negative 3 degrees, the processor further judges whether the temperature is higher than 1 degree, if yes, the processor does not process; if not, The processor starts timing. If the detected temperature is lower than 1 degree and the duration does not exceed 50 minutes, the processor clears the timing; if the detected temperature is lower than minus 1 degree and lasts for more than 50 minutes, the processor generates a control command to make the air conditioner enter antifreeze protection model;

If the detected temperature is lower than minus 3 degrees, the processor starts timing. If the detected temperature is lower than minus 3 degrees for less than 8 minutes, the processor clears the timer; if the detected temperature is lower than minus 3 degrees for more than 8 minutes , the processor generates a control command, so that the air conditioner enters the antifreeze protection mode.

Step 404, in the antifreeze protection mode, the processor compares the received detected temperature with the second set temperature, if the detected temperature is lower than 5 degrees, the processor does not process; if the detected temperature is higher than 5 degrees, The processor starts counting. If the detected temperature is higher than 5 degrees and the duration does not exceed 15 minutes, the processor clears the timing; if the detected temperature is higher than 1 degree and lasts for more than 15 minutes, the processor generates a control command to make the air conditioner exit the antifreeze protection model.

In the same way, the present invention can set more conditions for entering the anti-freezing protection mode according to actual needs. As long as the air-conditioning system meets any of the conditions during cooling operation, the air-conditioning system will be instructed to automatically enter the anti-freezing protection mode, which can further ensure that the air-conditioning system can be in the anti-freezing protection mode. It enters the antifreeze protection mode before freezing and water leakage occurs to ensure the normal operation of the air conditioning system.

The antifreeze mode of the present invention can be differentiated because of the different configurations of the air conditioning system. If the air conditioner system is an outdoor unit equipped with an indoor unit mode, the antifreeze mode is to close the outdoor unit, and the indoor unit continues to run. If the air conditioning system is in the mode of one outdoor unit with multiple indoor units, some of the indoor units need antifreeze protection, and the antifreeze protection mode is to close the electronic expansion valves of the above-mentioned part of the indoor units.

Referring to Fig. 5 , it is a structural diagram of the antifreeze system for the indoor unit of the air conditioner of the present invention, including a compressor 11, an outdoor unit 12, an electronic expansion valve 13A, an indoor unit evaporator 14A, a temperature sensor 15A, an electronic expansion valve 13B, an indoor unit evaporator 14B, And temperature sensor 15B. The temperature sensor 15A is set at the entrance of the indoor unit evaporator 14A to detect the intake air temperature of the indoor unit evaporator 14A, and the temperature sensor 15B is set at the entrance of the indoor unit evaporator 14B to detect the intake air temperature of the indoor unit evaporator 14B.

For example, according to the temperature detected by the temperature sensor 15A, the processor judges that it needs to enter the antifreeze protection mode, and the processor sends a control instruction to the electronic expansion valve 13A, instructing the electronic expansion valve 13A to close, while the electronic expansion valve 13B is opened as usual, and the indoor unit evaporator 14B is running normally.

In the air conditioning system, one outdoor unit is equipped with multiple indoor unit modes. When entering the antifreeze protection mode, only the electronic expansion valve of the indoor unit that needs to enter the antifreeze protection mode is closed, without affecting the work of other indoor units, ensuring the entire air conditioning system as much as possible. Cooling effect.

Based on the antifreezing method for the air conditioner indoor unit, the present invention also provides an antifreeze system for the air conditioner indoor unit, which can effectively solve the problem of icing and water leakage of the air conditioner indoor unit. Referring to FIG. 6 , it includes a temperature sensor 15 , a first antifreeze protection unit 16 , and an exit antifreeze protection unit 17 . The temperature sensor 15 is arranged at the entrance of the evaporator of the indoor unit, and sends the detected temperature value to the first entering antifreeze protection unit 16 and exiting antifreeze mode unit 17 .

The first antifreeze protection unit 16 instructs the air conditioner to enter the antifreeze protection mode when the received temperature value is lower than the first set temperature and lasts longer than the first set time. If the air conditioning system consists of one outdoor unit and one indoor unit, the antifreeze protection mode is to turn off the outdoor unit; if the air conditioning system consists of one outdoor unit and at least two indoor units, some of the indoor units need antifreeze protection, and the antifreeze protection mode is to turn off the above Electronic expansion valves of some indoor units.

Exiting the anti-freezing protection unit 17 commands the air conditioner to exit the anti-freezing mode when the received temperature value is higher than the second set temperature and lasts for the second set time.

Referring to FIG. 7 , it includes a temperature sensor 15 , a first entering antifreeze protection unit 16 , an exiting antifreeze protection unit 17 , and a second antifreeze protection unit 18 . The second antifreeze protection unit 18 receives the temperature value transmitted by the temperature sensor 15, and if the temperature value is lower than the third set temperature and lasts longer than the third set time, the air conditioner is instructed to enter the antifreeze protection mode.

The antifreeze method and antifreeze system of an air-conditioning indoor unit provided by the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for helping Understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification is not It should be understood as a limitation of the present invention.

Claims (10)

1, a kind of means to prevent freezing of indoor apparatus of air conditioner is characterized in that, this method comprises:

Detect the inlet temperature of indoor machine evaporation, be lower than first design temperature, and the duration surpasses first setting-up time as detected temperatures; the instruction air-conditioning enters anti-freezing protection mode; be higher than second design temperature until detected temperatures, and continue second setting-up time, the instruction air-conditioning withdraws from antifreeze pattern.

2, means to prevent freezing as claimed in claim 1 is characterized in that, this method also comprises:

Detected temperatures is lower than the 3rd design temperature as described, and the duration surpass the 3rd setting-up time, the instruction air-conditioning enters anti-freezing protection mode.

3, means to prevent freezing as claimed in claim 1 is characterized in that, this method also comprises:

Be made of an off-premises station and an indoor set as air-conditioning system, anti-freezing protection mode is for closing off-premises station.

4, means to prevent freezing as claimed in claim 1 is characterized in that, this method also comprises:

Be made of an off-premises station and at least two indoor sets as air-conditioning system, wherein the part indoor set needs anti-frost protection, and anti-freezing protection mode is the electric expansion valve of closing above-mentioned part indoor set.

As each described means to prevent freezing of claim 1 to 4, it is characterized in that 5, the scope of first design temperature is to bear 10 to spend to 0 degree; The scope of first setting-up time is 3 minutes to 15 minutes.

6, as each described means to prevent freezing of claim 1 to 4, it is characterized in that, the scope of second design temperature be 1 spend to 15 the degree; The scope of second setting-up time is 5 minutes to 25 minutes.

7, as each described means to prevent freezing of claim 1 to 4, it is characterized in that, the scope of the 3rd design temperature be 0 spend to 5 the degree; The scope of second setting-up time is 20 minutes to 90 minutes.

8, a kind of winterization system of indoor apparatus of air conditioner is characterized in that, comprises that temperature sensor, first enters antifreeze mode unit and withdraws from antifreeze mode unit:

Described temperature sensor is arranged on the porch of indoor machine evaporation, detected temperature value is sent to described first enter the anti-frost protection unit and withdraw from the anti-frost protection unit;

Described first enters the anti-frost protection unit, be used for being lower than first design temperature at the temperature value that receives, and duration when surpassing first setting-up time, the instruction air-conditioning enters anti-freezing protection mode;

Describedly withdraw from antifreeze mode unit, be used under anti-freezing protection mode, the temperature value that receives is higher than second design temperature, and continues second setting-up time, and the instruction air-conditioning withdraws from antifreeze pattern.

9, system as claimed in claim 8 is characterized in that, also comprises; the second anti-frost protection unit is received in the temperature value that described temperature sensor transmits, and is lower than the 3rd design temperature as this temperature value; and duration the 3rd setting-up time, the instruction air-conditioning enters anti-freezing protection mode.

10, system as claimed in claim 8 or 9 is characterized in that be made of an off-premises station and an indoor set as air-conditioning system, anti-freezing protection mode is for closing off-premises station; Be made of an off-premises station and at least two indoor sets as air-conditioning system, wherein the part indoor set needs anti-frost protection, and anti-freezing protection mode is the electric expansion valve of closing above-mentioned part indoor set.

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