阅读说明：本技术 一种空调器及空调过热度调节方法、装置 (Air conditioner and air conditioner superheat degree adjusting method and device ) 是由 秦中海 于 2020-05-12 设计创作，主要内容包括：本发明提供了一种空调器及空调过热度调节方法、装置,所述空调器,包括依次连通的蒸发器、四通阀、压缩机和冷凝器,其还包括电子膨胀阀组件,所述电子膨胀阀组件一端与所述压缩机的排气管连通,另一端与所述压缩机的回气管连通。这样,在吸气过热度过高或过低时,打开电子膨胀阀组件,对回气管内的吸气过热度进行调节,将其调节回适宜状态,从而避免出现吸气过热度过高或过低的情况,保证空调器的正常运行；另外,通过对吸气过热度的调节,还可以避免吸气过热度过高或过低导致的压缩机的可靠性降低的情形。(The invention provides an air conditioner and a method and a device for adjusting the superheat degree of the air conditioner. Therefore, when the suction superheat degree is too high or too low, the electronic expansion valve assembly is opened, the suction superheat degree in the return pipe is adjusted, and the return pipe is adjusted to be in a proper state, so that the condition that the suction superheat degree is too high or too low is avoided, and the normal operation of the air conditioner is ensured; in addition, the condition that the reliability of the compressor is reduced due to overhigh or overlow suction superheat degree can be avoided by adjusting the suction superheat degree.)

1. The air conditioner comprises an evaporator, a four-way valve (2), a compressor (3) and a condenser (4) which are sequentially communicated, and is characterized by further comprising an electronic expansion valve assembly (5), wherein one end of the electronic expansion valve assembly (5) is communicated with an exhaust pipe (31) of the compressor (3), and the other end of the electronic expansion valve assembly is communicated with an air return pipe (32) of the compressor (3).

2. The air conditioner as claimed in claim 1, wherein the air return pipe (32) is provided with a pressure sensor and a temperature sensor for detecting a pressure and a temperature of the refrigerant flowing in the air return pipe (32).

3. The air conditioner according to claim 1 or 2, wherein the electronic expansion valve assembly (5) includes an electronic expansion valve body (51) and a filter (52), and the exhaust pipe (31) communicates with the electronic expansion valve body (51) via the filter (52).

4. The air conditioner according to claim 3, wherein the electronic expansion valve assembly (5) further comprises a first capillary tube (53), and the filter (52) communicates with the electronic expansion valve body (51) through the first capillary tube (53).

5. The air conditioner according to claim 4, further comprising a needle valve (6), wherein the needle valve (6) is respectively communicated with the electronic expansion valve body (51) and the first capillary tube (53) through a three-way joint (7).

6. The air conditioner as claimed in claim 3, wherein the electronic expansion valve assembly (5) further comprises a second capillary tube (54), and the electronic expansion valve body (51), the second capillary tube (54) and the air return pipe (32) are sequentially communicated with each other in a refrigerant flowing direction.

7. The air conditioner according to claim 6, wherein the air return pipe (32) is provided with a hole (33), and one end of the second capillary tube (54) is inserted into the hole (33) and fixedly connected with the air return pipe (32).

8. The air conditioner according to claim 7, wherein the second capillary tube (54) is fixed to the muffler (32) by welding.

9. The air conditioner according to claim 7, wherein the end of the second capillary tube (54) inserted into the air return tube (32) exceeds the inner wall of the air return tube (32).

10. The air conditioner according to claim 3, wherein the filter (52) communicates with the exhaust duct (31) through a third capillary tube or L-tube (8).

11. An air conditioner superheat degree adjusting method for controlling an air conditioner as claimed in any one of claims 1 to 10, comprising:

detecting a suction pressure and a suction temperature of the compressor (3);

determining the suction superheat degree of the air conditioner according to the suction pressure and the suction temperature;

if the suction superheat is less than or equal to a first temperature threshold or greater than a fourth temperature threshold, opening the electronic expansion valve assembly (5), wherein the first temperature threshold is less than the fourth temperature threshold.

12. An air conditioner superheat degree adjusting method according to claim 11, wherein the opening of the electronic expansion valve assembly (5) if the suction superheat degree is equal to or less than a first temperature threshold value or greater than a fourth temperature threshold value comprises:

if the suction superheat degree is less than or equal to the first temperature threshold, opening the electronic expansion valve assembly (5) and controlling the opening degree of the electronic expansion valve assembly (5) to keep a large opening degree;

and if the suction superheat degree is larger than the fourth temperature threshold value, opening the electronic expansion valve assembly (5) and controlling the opening degree of the electronic expansion valve assembly (5) to keep a small opening degree.

13. An air conditioner superheat degree adjusting method as claimed in claim 11, wherein said determining a suction superheat degree of said air conditioner based on said suction pressure and said suction temperature comprises:

determining the evaporation temperature of the evaporator according to the suction pressure;

and determining the suction superheat degree of the air conditioner according to the suction temperature and the evaporation temperature.

14. An air conditioner superheat degree adjusting method as claimed in any one of claims 11 to 13, further comprising, after determining the suction superheat degree of the air conditioner based on the suction pressure and the suction temperature:

closing the electronic expansion valve assembly (5) if the suction superheat is greater than a second temperature threshold and less than or equal to a third temperature threshold, wherein the first temperature threshold is less than the second temperature threshold and the third temperature threshold is less than the fourth temperature threshold.

15. An air conditioner superheat degree adjusting method as claimed in claim 14, further comprising, after determining the suction superheat degree of the air conditioner based on the suction pressure and the suction temperature:

and if the suction superheat degree is larger than the first temperature threshold value and smaller than or equal to the second temperature threshold value, controlling the electronic expansion valve assembly (5) to keep the operation state at the previous moment.

16. An air conditioner superheat degree adjusting method as claimed in claim 14, further comprising, after determining the suction superheat degree of the air conditioner based on the suction pressure and the suction temperature:

and if the suction superheat degree is larger than the third temperature threshold value and smaller than or equal to the fourth temperature threshold value, controlling the electronic expansion valve assembly (5) to keep the operation state at the previous moment.

17. An air conditioner superheat degree adjusting device is characterized by comprising:

a detection unit (11) for detecting a suction pressure and a suction temperature of the compressor (3);

a determination unit (12) for determining a suction superheat of the air conditioner based on the suction pressure and the suction temperature;

a control unit (13) for opening the electronic expansion valve assembly (5) if the suction superheat is less than or equal to a first temperature threshold or greater than a fourth temperature threshold, wherein the first temperature threshold is less than the fourth temperature threshold.

18. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when read and executed by a processor, implements the air conditioner superheat degree adjustment method according to any one of claims 11 to 16.

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioner and a method and a device for adjusting the superheat degree of the air conditioner.

Background

The conventional household constant-frequency air conditioner adopts a refrigeration capillary throttling mode, and the throttling mode can save the cost to a great extent; but at the same time brings about the disadvantage of a fixed throttle situation.

The throttling state is fixed, namely the throttling capacity of the capillary tube to the flowing refrigerant cannot be changed, so that the air-conditioner has different suction superheat degrees when running in different environments, and the condition of overhigh suction superheat degree or no suction superheat degree can occur.

Disclosure of Invention

The invention solves the problem that the existing throttling mode can not adjust the degree of superheat of the air suction.

In order to solve the above problems, the present invention firstly provides an air conditioner, which comprises an evaporator, a four-way valve, a compressor, a condenser and an electronic expansion valve assembly, wherein the evaporator, the four-way valve, the compressor and the condenser are sequentially communicated, one end of the electronic expansion valve assembly is communicated with an exhaust pipe of the compressor, and the other end of the electronic expansion valve assembly is communicated with a return pipe of the compressor.

Therefore, when the suction superheat degree is too high or too low, the electronic expansion valve assembly is opened, the suction superheat degree in the return pipe is adjusted, and the return pipe is adjusted to be in a proper state, so that the condition that the suction superheat degree is too high or too low is avoided, and the normal operation of the air conditioner is ensured. In addition, the condition that the reliability of the compressor is reduced due to overhigh or overlow suction superheat degree can be avoided by adjusting the suction superheat degree.

Optionally, the air return pipe is provided with a pressure sensor and a temperature sensor to detect the pressure and temperature of the refrigerant flowing in the air return pipe.

Therefore, the pressure of the refrigerant in the return pipe can be detected through the pressure sensor, and the temperature of the refrigerant in the return pipe is detected through the temperature sensor, so that the suction superheat degree of the refrigerant in the return pipe is determined.

Optionally, the electronic expansion valve assembly includes an electronic expansion valve body and a filter, and the exhaust pipe is communicated with the electronic expansion valve body via the filter.

Through setting up the filter, can flow into the electronic expansion valve body after filtering the refrigerant in the blast pipe again, prevent impurity etc. in the filter from blockking up the passageway in the electronic expansion valve body to ensure electronic expansion valve's normal use.

Optionally, the electronic expansion valve assembly further includes a first capillary tube, and the filter is communicated with the electronic expansion valve body through the first capillary tube.

In this way, the first capillary tube increases the throttling capacity of the electronic expansion valve body, so that the limitation of the throttling capacity of the electronic expansion valve body is reduced, the types and the number of the applicable electronic expansion valve bodies are increased, and the applicable cost is reduced.

Optionally, the air conditioner further comprises a needle valve, and the needle valve is communicated with the electronic expansion valve body and the first capillary tube through a three-way interface respectively.

Thus, through the needle valve, external lubricating oil and the like can be added into the first capillary tube and the passage of the electronic expansion valve body, so that oil return is carried out when the refrigerant enters the compressor; in addition, the air conditioner can be maintained by adding refrigerant through the needle valve when the air conditioner does not work.

Optionally, the electronic expansion valve assembly further includes a second capillary tube, and the electronic expansion valve body, the second capillary tube, and the air return pipe are sequentially communicated along a refrigerant flowing direction.

Therefore, the valve body of the electronic expansion valve is communicated with the air return pipe through the second capillary tube, so that on one hand, the throttling capacity of the whole electronic expansion valve assembly can be further increased, and the requirement on the valve body of the electronic expansion valve is reduced; on the other hand, the second capillary tube can also prevent the refrigerant in the return tube from generating a small-range backflow condition, so that the backflow is prevented from polluting the valve body of the electronic expansion valve.

Optionally, a hole is formed in the air return pipe, and one end of the second capillary is inserted into the hole and is fixedly connected with the air return pipe.

Therefore, the second capillary tube is inserted into the air return tube, so that the refrigerant only passes through the inner wall of the second capillary tube when flowing at the joint of the second capillary tube and the air return tube, and the flowing smoothness of the refrigerant is ensured.

Optionally, the second capillary is fixed to the muffler by welding. Therefore, the second capillary tube and the air return pipe can be fixed more stably by welding; and the second capillary tube is inserted into the muffler, so that the channel for refrigerant circulation is not affected during welding.

Optionally, the end of the second capillary inserted into the return air pipe exceeds the inner wall of the return air pipe. Therefore, the inserting part of the second capillary tube exceeds the inner wall of the air return pipe, and the fixing mode of the second capillary tube and the air return pipe is more stable.

Optionally, the filter is in communication with the exhaust pipe via a third capillary or L-tube.

Therefore, the L pipes are communicated, the strength of the L pipes is high, and the connection stability can be improved; the throttling capacity of the entire electronic expansion valve assembly can be further increased by the third capillary tube.

Secondly, an air conditioner superheat degree adjusting method is provided for controlling the air conditioner, and comprises the following steps:

detecting a suction pressure and a suction temperature of the compressor;

determining the suction superheat degree of the air conditioner according to the suction pressure and the suction temperature;

and if the suction superheat degree is less than or equal to a first temperature threshold value or greater than a fourth temperature threshold value, opening the electronic expansion valve assembly, wherein the first temperature threshold value is less than the fourth temperature threshold value.

Therefore, when the suction superheat degree is too high or too low, the electronic expansion valve assembly is opened, the suction superheat degree in the return pipe is adjusted, and the return pipe is adjusted to be in a proper state, so that the condition that the suction superheat degree is too high or too low is avoided, and the normal operation of the air conditioner is ensured. In addition, the condition that the reliability of the compressor is reduced due to overhigh or overlow suction superheat degree can be avoided by adjusting the suction superheat degree.

Optionally, if the suction superheat degree is less than or equal to the first temperature threshold or greater than a fourth temperature threshold, the opening the electronic expansion valve assembly includes:

if the suction superheat degree is less than or equal to the first temperature threshold, opening the electronic expansion valve assembly and controlling the opening degree of the electronic expansion valve assembly to keep a large opening degree;

and if the suction superheat degree is larger than the fourth temperature threshold, opening the electronic expansion valve assembly and controlling the opening degree of the electronic expansion valve assembly to keep a small opening degree.

Thus, different opening degrees of the valve body of the electronic expansion valve are set according to different suction superheat degrees, so that a refrigerant with a lower temperature flows into the refrigerant with an overhigh suction superheat degree, and the superheat degree of the refrigerant in a gas return pipe is reduced; the superheat degree of the refrigerant in the muffler is increased aiming at the refrigerant with the lower suction superheat degree and higher temperature flowing in; and the suction superheat degree is kept in a proper range, so that the reliability of the compressor is improved, and the air conditioner keeps high heating/cooling performance.

Optionally, the determining the suction superheat of the air conditioner according to the suction pressure and the suction temperature comprises:

determining the evaporation temperature of the evaporator according to the suction pressure;

and determining the suction superheat degree of the air conditioner according to the suction temperature and the evaporation temperature.

Therefore, the suction superheat degree can be directly calculated through a table look-up or a calculation formula, and the accuracy of the suction superheat degree can be ensured; thus, the measuring speed and the measuring accuracy are improved.

Optionally, after determining the suction superheat of the air conditioner according to the suction pressure and the suction temperature, the method further comprises:

closing the electronic expansion valve assembly if the suction superheat is greater than a second temperature threshold and less than or equal to a third temperature threshold, wherein the first temperature threshold is less than the second temperature threshold and the third temperature threshold is less than the fourth temperature threshold.

Therefore, when the suction superheat degree enters the proper temperature, the adjustment is stopped, so that the suction superheat degree can be kept in the proper temperature range, on one hand, the phenomenon that the reliability of the compressor is damaged by the excessively high or excessively low suction superheat degree is avoided, and on the other hand, the working performance of the air conditioner can be kept in the maximum range.

Optionally, after determining the suction superheat of the air conditioner according to the suction pressure and the suction temperature, the method further comprises:

and if the suction superheat degree is larger than the first temperature threshold value and smaller than or equal to the second temperature threshold value, controlling the electronic expansion valve assembly to keep the operation state at the previous moment.

The area between the first temperature threshold and the second temperature threshold is set to be the buffer area, so that the repeated starting and stopping conditions of the electronic expansion valve assembly caused by temperature fluctuation can be avoided, the smooth proceeding of air suction superheat degree adjustment is ensured, and the possibility that the service life is influenced by frequent starting and stopping is eliminated.

Optionally, after determining the suction superheat of the air conditioner according to the suction pressure and the suction temperature, the method further comprises:

and if the suction superheat degree is larger than the third temperature threshold value and smaller than or equal to the fourth temperature threshold value, controlling the electronic expansion valve assembly to keep the operation state at the previous moment.

The area between the third temperature threshold and the fourth temperature threshold is set to be the buffer area, so that the repeated starting and stopping conditions of the electronic expansion valve assembly caused by temperature fluctuation can be avoided, the smooth proceeding of air suction superheat degree adjustment is ensured, and the possibility that the service life is influenced by frequent starting and stopping is eliminated.

There is provided again an air conditioner superheat degree adjusting device, including:

a detection unit for detecting a suction pressure and a suction temperature of the compressor;

a determination unit for determining a suction superheat of the air conditioner based on the suction pressure and the suction temperature;

a control unit for opening the electronic expansion valve assembly if the suction superheat is less than or equal to a first temperature threshold or greater than a fourth temperature threshold, wherein the first temperature threshold is less than the fourth temperature threshold.

Therefore, when the suction superheat degree is too high or too low, the electronic expansion valve assembly is opened, the suction superheat degree in the return pipe is adjusted, and the return pipe is adjusted to be in a proper state, so that the condition that the suction superheat degree is too high or too low is avoided, and the normal operation of the air conditioner is ensured. In addition, the condition that the reliability of the compressor is reduced due to overhigh or overlow suction superheat degree can be avoided by adjusting the suction superheat degree.

Finally, a computer-readable storage medium is provided, which stores a computer program, and when the computer program is read and executed by a processor, the method for adjusting the superheat degree of the air conditioner is realized.

Therefore, when the suction superheat degree is too high or too low, the electronic expansion valve assembly is opened, the suction superheat degree in the return pipe is adjusted, and the return pipe is adjusted to be in a proper state, so that the condition that the suction superheat degree is too high or too low is avoided, and the normal operation of the air conditioner is ensured. In addition, the condition that the reliability of the compressor is reduced due to overhigh or overlow suction superheat degree can be avoided by adjusting the suction superheat degree.

Drawings

Fig. 1 is a schematic structural view of an air conditioner according to an embodiment of the present invention;

FIG. 2 is a schematic communication diagram of an electronic expansion valve assembly according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of an electronic expansion valve assembly according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an air return interface according to an embodiment of the invention;

FIG. 5 is a flow chart of a method for adjusting the degree of superheat of an air conditioner according to an embodiment of the present invention;

FIG. 6 is a flowchart of steps 300 of an air conditioner superheat degree adjustment method according to an embodiment of the invention;

FIG. 7 is a flowchart of steps 200 of an air conditioner superheat degree adjustment method according to an embodiment of the invention;

FIG. 8 is a flow chart of a method for adjusting the degree of superheat of an air conditioner according to another embodiment of the present invention;

FIG. 9 is a flow chart of a method for adjusting the degree of superheat of an air conditioner according to still another embodiment of the present invention;

FIG. 10 is a flow chart of a method for adjusting the degree of superheat of an air conditioner according to a further embodiment of the present invention;

fig. 11 is a block diagram showing the structure of an air conditioner superheat degree adjusting device according to an embodiment of the present invention.

Description of reference numerals:

11-detection unit, 12-determination unit, 13-control unit, 2-four-way valve, 3-compressor, 31-exhaust pipe, 32-muffler, 33-hole, 4-condenser, 5-electronic expansion valve assembly, 51-electronic expansion valve body, 52-filter, 53-first capillary pipe, 54-second capillary pipe, 6-needle valve, 7-three-way interface and 8-L pipe.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

For easy understanding, in the present invention, technical problems therein need to be elaborated.

The conventional household constant-frequency air conditioner adopts a refrigeration capillary throttling mode, and the throttling mode can save the cost to a great extent; but at the same time brings about the disadvantage of a fixed throttle situation.

The throttling state is fixed, namely the throttling capacity of the capillary tube to the flowing refrigerant cannot be changed. When the air conditioner is in operation, the degree of superheat of the air sucked by the air conditioner varies according to the operating environment and requirements.

The suction superheat degree of the air conditioner is the temperature difference between the suction temperature and the evaporation temperature of the compressor; it should be noted that the evaporation temperature is a temperature at which the liquid refrigerant is evaporated to the gaseous refrigerant in the evaporator, that is, a saturation temperature of the refrigerant at the current pressure.

The saturation temperature (saturation temperature) is a temperature at which the liquid and the vapor are in a dynamic equilibrium state, i.e., a saturated state. In the saturated state, the temperatures of the liquid and vapor are equal. When the saturation temperature is constant, the saturation pressure is also constant; conversely, the saturation temperature is constant when the saturation pressure is constant. The pressure increases and a new dynamic equilibrium state is formed at the new temperature. A certain saturation temperature of the substance must correspond to a certain saturation pressure.

The suction superheat degree cannot be too high or too low for the whole air conditioner; if the suction superheat degree is too high, the suction temperature under the same pressure is high, the exhaust temperature of the compressor is further high, the performance and the service life of lubricating oil are influenced, and finally the reliability of the compressor is influenced; if the suction superheat of the air conditioner is too low or is a negative value, the refrigerant entering the compressor contains liquid refrigerant, and if no gas-liquid separator is arranged, the liquid refrigerant flows back to the compressor, so that the liquid impact of the compressor is caused, and the reliability of the compressor is influenced.

Therefore, the adjustment and control of the superheat degree of the air conditioner are important for the compressor.

An embodiment of the present disclosure provides an air conditioner, as shown in fig. 1, which is a schematic structural diagram of an air conditioner according to an embodiment of the present disclosure; the air conditioner comprises an evaporator (not shown in the figure), a four-way valve 2, a compressor 3 and a condenser 4 which are sequentially communicated, and is characterized by further comprising an electronic expansion valve assembly 5, wherein one end of the electronic expansion valve assembly 5 is communicated with an exhaust pipe 31 of the compressor 3, and the other end of the electronic expansion valve assembly 5 is communicated with an air return pipe 32 of the compressor 3.

As shown in fig. 1, point a is a connection point of the discharge pipe 31 of the compressor 3 and the electronic expansion valve assembly 5, point B is a connection point of the return pipe 32 of the compressor 3 and the electronic expansion valve assembly 5, and point a and point B form a passage through the electronic expansion valve assembly 5.

Thus, in the normal operation of the air conditioner, the electronic expansion valve assembly 5 keeps a closed state, the channel between the point a and the point B keeps an open circuit, at this time, the operation state of the air conditioner is a normal operation state, the suction superheat degree of the refrigerant in the return pipe 32 of the compressor 3 is an appropriate state, and the operation of the whole air conditioner is not influenced by the electronic expansion valve assembly 5; the return pipe 32 of the compressor 3 is filled with a low-temperature and low-pressure gaseous refrigerant, and after passing through the compressor 3, the discharge pipe 31 of the compressor 3 is filled with a high-temperature and high-pressure gaseous refrigerant.

If the suction superheat degree of the refrigerant in the return pipe 32 changes, such as too high or too low, at this time, the electronic expansion valve assembly 5 is opened to conduct the passage between the point a and the point B, so that the high-temperature and high-pressure gaseous refrigerant in the exhaust pipe 31 enters the return pipe 32 through the electronic expansion valve assembly 5, the temperature and the pressure of the gaseous refrigerant in the return pipe 32 are adjusted, and the suction superheat degree of the refrigerant in the return pipe 32 is adjusted to be in a proper state.

Therefore, when the suction superheat degree is too high or too low, the electronic expansion valve assembly 5 is opened to adjust the suction superheat degree in the return air pipe 32 to return the suction superheat degree to a proper state, so that the condition that the suction superheat degree is too high or too low is avoided, and the normal operation of the air conditioner is ensured. In addition, by adjusting the degree of suction superheat, it is possible to avoid a decrease in reliability of the compressor 3 due to an excessively high or excessively low degree of suction superheat.

Here, it should be noted that the smaller the cross section of the passage from the exhaust pipe 31 to the muffler 32, the larger the flow resistance (the larger the pressure difference between the refrigerant flowing into the passage and the refrigerant flowing out of the passage), the larger the pressure drop after the passage (the larger the pressure difference between the refrigerant flowing into the passage and the refrigerant flowing out of the passage), and the larger the temperature difference between the refrigerant flowing into the passage and the refrigerant flowing out of the passage; that is, by adjusting the cross section of the passage from the discharge pipe 31 to the muffler 32, the pressure and temperature of the refrigerant flowing out of the passage can be controlled, and the refrigerant is mixed with the refrigerant in the muffler 32 to adjust the degree of superheat of the suction gas.

The opening of the electronic expansion valve is a small opening (the diameter of the electronic expansion valve is reduced), the resistance of the refrigerant passing through the electronic expansion valve is increased, the flow rate of the refrigerant passing through the electronic expansion valve in unit time is reduced, the pressure of the refrigerant passing through the electronic expansion valve is greatly reduced, the temperature of the refrigerant is correspondingly reduced, and the temperature of the refrigerant is lower than that of the refrigerant in the air return pipe 32; when the suction superheat degree of the unit is too high, the air conditioner control panel feeds back an instruction for adjusting the electronic expansion valve to control the electronic expansion valve to be opened, and the superheat degree of the low-temperature refrigerant is reduced.

The opening of the electronic expansion valve is adjusted to be large (the aperture of the electronic expansion valve is increased), the resistance of the refrigerant passing through the electronic expansion valve is reduced, the flow rate of the refrigerant passing through the electronic expansion valve in unit time is increased, the pressure of the refrigerant passing through the electronic expansion valve is relatively high (the pressure is reduced little), and the corresponding temperature of the refrigerant is high (lower than the temperature of the refrigerant in the exhaust pipe 31 and higher than the temperature of the refrigerant in the return pipe 32); when the unit has no suction superheat (or the suction superheat is a negative value), the air-conditioning control panel feeds back an instruction for adjusting the electronic expansion valve to control the electronic expansion valve to be opened, and the superheat is improved by a high-temperature refrigerant.

Optionally, a pressure sensor (not shown) and a temperature sensor (not shown) are disposed on the air return pipe 32 to detect the pressure and the temperature of the refrigerant flowing in the air return pipe 32.

In this way, the pressure of the refrigerant in the muffler 32 can be detected by the pressure sensor, and the temperature of the refrigerant in the muffler 32 can be detected by the temperature sensor, thereby determining the suction superheat degree of the refrigerant in the muffler 32.

Once the suction superheat is determined, it is determined whether the suction superheat is maintained in a favorable condition and the adjustment is made by opening the electronic expansion valve assembly 5 when the suction superheat is too high or too low.

Alternatively, as shown in fig. 2, the electronic expansion valve assembly 5 includes an electronic expansion valve body 51 and a filter 52, and the exhaust pipe 31 communicates with the electronic expansion valve body 51 via the filter 52.

By providing the filter 52, the refrigerant in the exhaust pipe 31 can be filtered and then flows into the electronic expansion valve body 51, so that the passage in the electronic expansion valve body 51 is prevented from being blocked by impurities and the like in the filter 52, and the normal use of the electronic expansion valve is ensured.

It should be noted that, because two ends of the electronic expansion valve assembly 5 are respectively communicated with the exhaust pipe 31 and the air return pipe 32, high-temperature and high-pressure gas is in the exhaust pipe 31, and low-temperature and low-pressure gas is in the air return pipe 32; when the electronic expansion valve assembly 5 is opened due to the pressure difference, the refrigerant flows only from the exhaust pipe 31 to the return pipe 32, and does not flow in the opposite direction.

Optionally, the filter 52 is additionally installed at both ends of the valve body 51 of the electronic expansion valve, so that even if a small-range local backflow condition exists in the whole channel, the refrigerant passing through the valve body 51 of the electronic expansion valve can be ensured not to contain impurities.

Optionally, as shown in fig. 2 and 3, the electronic expansion valve assembly 5 further includes a first capillary tube 53, and the filter 52 is in communication with the electronic expansion valve body 51 through the first capillary tube 53.

Here, the arrangement is such that the filter 52, the first capillary tube 53, and the electronic expansion valve body 51 communicate in this order in the refrigerant flow direction; in this way, the restriction of the throttling capacity of the electronic expansion valve body 51 is reduced by increasing the throttling capacity of the electronic expansion valve body 51 through the first capillary tube 53, and the type and number of the electronic expansion valve bodies 51 to be applied are increased, thereby reducing the application cost.

It should be noted that one end of the electronic expansion valve assembly 5 is a high-temperature high-pressure gas refrigerant, and the other end is a low-temperature low-pressure gas refrigerant, so that in order to ensure that the suction superheat degree of the refrigerant in the return air pipe 32 can be adjusted through the electronic expansion valve assembly 5, the electronic expansion valve assembly 5 is required to have a large-range throttling capability adjusting function, if an independent electronic expansion valve body 51 is used to realize the large-range throttling capability adjustment, the requirement on the electronic expansion valve body 51 is high, only a small part of large-size electronic expansion valve body 51 can be suitable, and the cost of the large-size electronic expansion valve body 51 is generally high; by arranging the first capillary tube 53, the first capillary tube 53 shares part of throttling function, thereby greatly reducing the requirement on the throttling capacity of the electronic expansion valve body 51, expanding the applicable scope of the electronic expansion valve body 51 and greatly reducing the cost of the electronic expansion valve body 51.

Optionally, as shown in fig. 2, the electronic expansion valve assembly 5 further includes a second capillary tube 54, and the electronic expansion valve body 51, the second capillary tube 54, and the air return pipe 32 are sequentially communicated in a refrigerant flowing direction.

Therefore, the electronic expansion valve body 51 is communicated with the air return pipe 32 through the second capillary tube 54, on one hand, the throttling capacity of the whole electronic expansion valve assembly 5 can be further increased, and the requirement on the electronic expansion valve body 51 is reduced; on the other hand, the second capillary tube 54 can prevent the refrigerant in the return pipe 32 from flowing back to a small extent, and the return flow can be prevented from contaminating the electronic expansion valve body 51.

Optionally, as shown in fig. 2 and 3, the air conditioner further includes a needle valve 6, and the needle valve 6 is respectively communicated with the electronic expansion valve body 51 and the first capillary 53 through a three-way interface 7.

Thus, by the needle valve 6, the lubricating oil and the like from the outside can be added into the passage between the first capillary 53 and the electronic expansion valve body 51, so as to return oil along with the refrigerant entering the compressor 3; in addition, the inspection may be performed by introducing a refrigerant through the needle valve 6 when the air conditioner is not in operation.

Alternatively, as shown in fig. 2, the filter 52 is connected to the exhaust pipe 31 through a third capillary (not shown) or an L-shaped pipe 8.

The filter 52 and the exhaust pipe 31 may be connected by a third capillary tube, or may be connected to the exhaust pipe 31 by an L-shaped tube 8 (i.e., an L-shaped tube). Therefore, the L pipes 8 are communicated, and the strength of the L pipes 8 is high, so that the connection stability can be improved; by means of the third capillary tube, the throttling capacity of the entire electronic expansion valve assembly 5 can be further increased.

Optionally, as shown in fig. 4, a hole 33 is provided on the air return pipe 32, and one end of the second capillary 54 is inserted into the hole 33 and is fixedly connected to the air return pipe 32.

In this way, by inserting the second capillary tube 54 into the muffler 32, the refrigerant can only pass through the inner wall of the second capillary tube 54 when flowing at the joint between the second capillary tube 54 and the muffler 32, thereby ensuring smooth flow of the refrigerant.

Optionally, the second capillary 54 is fixed to the muffler 32 by welding. Thus, the second capillary tube 54 can be fixed to the muffler 32 more firmly by welding; and the second capillary tube 54 is inserted into the muffler 32 so that the passage through which the refrigerant flows is not affected during welding.

Alternatively, as shown in fig. 4, the end of the second capillary tube 54 inserted into the muffler 32 extends beyond the inner wall of the muffler 32.

Thus, the fixing manner of the second capillary 54 and the muffler 32 can be more stable if the inserted portion of the second capillary 54 exceeds the inner wall of the muffler 32 (if the inserted portion does not exceed the muffler 32, it means that the inserted portion is too short, the second capillary 54 is easily deviated after being subjected to a force perpendicular to the axial direction, and further a crack is generated at the joint, which affects the fixing of the inserted portion and the muffler 32).

Optionally, the end of the second capillary 54 inserted into the air return pipe 32 exceeds the inner wall of the air return pipe 32 by less than or equal to 2 mm. In this way, it is avoided that the inserted excess portion affects the normal flow of the refrigerant in the return air pipe 32.

Optionally, the first capillary 53/the second capillary 54/the third capillary/the L pipe 8/the exhaust pipe 31/the muffler 32 are metal pipes, so that the structure strength is high, and the welding and fixing are easy.

Optionally, the first capillary 53, the second capillary 54, the third capillary, the L pipe 8, the exhaust pipe 31, and the muffler 32 are copper pipes, so that the strength is high, the heat conductivity is good, and the maintenance is easy.

It should be noted that if the aperture of the second capillary 54 is different from the size of the hole 33 of the muffler 32, the second capillary 54 with a thick end and a thin end can be formed by thickening the insertion end of the second capillary 54.

The connection method of the exhaust pipe 31 and the third capillary or the L pipe 8 is also the same as the connection method of the second capillary 54 and the muffler 32.

The embodiment of the disclosure provides an air conditioner superheat degree adjusting method, which is used for controlling the air conditioner and can be executed by an air conditioner superheat degree adjusting device, and the air conditioner superheat degree adjusting device can be integrated in electronic equipment such as an air conditioner, an air conditioner and the like. Fig. 5 is a flow chart of an air conditioner superheat degree adjusting method according to an embodiment of the invention; the air conditioner superheat degree adjusting method comprises the following steps:

step 100, detecting the suction pressure and the suction temperature of the compressor 3;

wherein the suction pressure can be detected by a pressure sensor disposed in the air return pipe 32, and the suction temperature can be detected by a temperature sensor disposed in the air return pipe 32.

Step 200, determining the suction superheat degree of the air conditioner according to the suction pressure and the suction temperature;

step 300, if the suction superheat degree is less than or equal to a first temperature threshold value or greater than a fourth temperature threshold value, opening the electronic expansion valve assembly 5, wherein the first temperature threshold value is less than the fourth temperature threshold value.

The suction superheat degree is less than or equal to a first temperature threshold, which means that the suction superheat degree is too low, the refrigerant in the return pipe 32 is a gaseous refrigerant and a liquid refrigerant which are interwoven and coexist, the refrigerant entering the compressor 3 contains a liquid refrigerant, and the liquid refrigerant flowing back to the compressor 3 causes liquid slugging of the compressor 3; the fact that the suction superheat degree is larger than the fourth temperature threshold means that the suction superheat degree is too high, and the suction temperature is too high under the same suction pressure, so that the exhaust temperature of the compressor 3 is too high, the performance and the service life of lubricating oil are affected, and the reliability of the compressor 3 is affected finally.

Thus, the electronic expansion valve assembly 5 is opened to communicate the high-temperature and high-pressure refrigerant in the exhaust pipe 31 with the low-temperature and low-pressure refrigerant in the return pipe 32, and the refrigerant flows from the exhaust pipe 31 to the return pipe 32, so that the suction superheat degree of the refrigerant in the return pipe 32 is influenced, the suction superheat degree is adjusted to be in a proper state, and the normal use of the air conditioner is ensured.

Here, it should be noted that the smaller the cross section of the passage from the exhaust pipe 31 to the muffler 32, the larger the flow resistance (the larger the pressure difference between the refrigerant flowing into the passage and the refrigerant flowing out of the passage), the larger the pressure drop after the passage (the larger the pressure difference between the refrigerant flowing into the passage and the refrigerant flowing out of the passage), and the larger the temperature difference between the refrigerant flowing into the passage and the refrigerant flowing out of the passage; that is, by adjusting the cross section of the passage from the discharge pipe 31 to the muffler 32, the pressure and temperature of the refrigerant flowing out of the passage can be controlled, and the refrigerant is mixed with the refrigerant in the muffler 32 to adjust the degree of superheat of the suction gas.

The opening of the electronic expansion valve is a small opening (the diameter of the electronic expansion valve is reduced), the resistance of the refrigerant passing through the electronic expansion valve is increased, the flow rate of the refrigerant passing through the electronic expansion valve in unit time is reduced, the pressure of the refrigerant passing through the electronic expansion valve is greatly reduced, the temperature of the refrigerant is correspondingly reduced, and the temperature of the refrigerant is lower than that of the refrigerant in the air return pipe 32; when the suction superheat degree of the unit is too high, the air conditioner control panel feeds back an instruction for adjusting the electronic expansion valve to control the electronic expansion valve to be opened, and the superheat degree of the low-temperature refrigerant is reduced.

The opening of the electronic expansion valve is adjusted to be large (the aperture of the electronic expansion valve is increased), the resistance of the refrigerant passing through the electronic expansion valve is reduced, the flow rate of the refrigerant passing through the electronic expansion valve in unit time is increased, the pressure of the refrigerant passing through the electronic expansion valve is relatively high (the pressure is reduced little), and the corresponding temperature of the refrigerant is high (lower than the temperature of the refrigerant in the exhaust pipe 31 and higher than the temperature of the refrigerant in the return pipe 32); when the unit has no suction superheat (or the suction superheat is a negative value), the air-conditioning control panel feeds back an instruction for adjusting the electronic expansion valve to control the electronic expansion valve to be opened, and the superheat is improved by a high-temperature refrigerant.

Therefore, when the suction superheat degree is too high or too low, the electronic expansion valve assembly 5 is opened to adjust the suction superheat degree in the return air pipe 32 to return the suction superheat degree to a proper state, so that the condition that the suction superheat degree is too high or too low is avoided, and the normal operation of the air conditioner is ensured. In addition, by adjusting the degree of suction superheat, it is possible to avoid a decrease in reliability of the compressor 3 due to an excessively high or excessively low degree of suction superheat.

Optionally, as shown in fig. 6, the step 300, if the suction superheat degree is less than or equal to the first temperature threshold or greater than the fourth temperature threshold, opening the electronic expansion valve assembly 5 includes:

step 310, if the suction superheat degree is less than or equal to the first temperature threshold, opening the electronic expansion valve assembly 5 and controlling the opening degree of the electronic expansion valve assembly 5 to keep a large opening degree;

the large opening degree is that the opening degree can make the temperature of the refrigerant flowing through the passage of the electronic expansion valve assembly 5 be higher than the temperature of the refrigerant in the muffler 32; the specific value of the opening degree can be obtained through experiments.

When the electronic expansion valve is specifically used, the opening degree corresponding to each air suction superheat degree is preset in the air conditioner, when the electronic expansion valve is opened at the air suction superheat degree, the corresponding opening degree is determined by inquiring (in the step, the opening degree is large), and then the electronic expansion valve is opened after the opening degree is set as the target opening degree of the electronic expansion valve body 51.

Thus, the refrigerant of a relatively high temperature flows in by the large opening degree, and the degree of superheat of the refrigerant in the muffler 32 is increased.

And 320, if the suction superheat degree is greater than the fourth temperature threshold value, opening the electronic expansion valve assembly 5 and controlling the opening degree of the electronic expansion valve assembly 5 to keep a small opening degree.

The small opening degree is that the opening degree can make the temperature of the refrigerant after flowing through the passage of the electronic expansion valve assembly 5 smaller than the temperature of the refrigerant in the muffler 32; the specific value of the opening degree can be obtained through experiments.

When the electronic expansion valve is specifically used, the opening degree corresponding to each air suction superheat degree is preset in the air conditioner, when the electronic expansion valve is opened at the air suction superheat degree, the corresponding opening degree (the small opening degree in the step) is determined by inquiring, and then the electronic expansion valve is opened after the opening degree is set as the target opening degree of the electronic expansion valve body 51.

Thus, the refrigerant having a relatively low temperature flows through the small opening, and the superheat of the refrigerant in the muffler 32 is reduced.

Thus, different opening degrees of the valve body 51 of the electronic expansion valve are set according to different suction superheat degrees, so that the superheat degree of the refrigerant in the air return pipe 32 is reduced by flowing the refrigerant with lower temperature aiming at the overhigh suction superheat degree; the superheat degree of the refrigerant in the muffler 32 is raised for the refrigerant with the lower suction superheat degree and the higher temperature; and the suction superheat degree is kept in a proper range, so that the reliability of the compressor 3 is improved, and the air conditioner keeps high heating/cooling performance.

Alternatively, as shown in fig. 7, the step 200 of determining the suction superheat of the air conditioner according to the suction pressure and the suction temperature includes:

step 210, determining the evaporation temperature of the evaporator according to the suction pressure;

wherein the evaporation temperature is the temperature at which the liquid refrigerant evaporates in the evaporator to gaseous refrigerant, i.e. the saturation temperature of the refrigerant at the current pressure. Therefore, in the case where the suction pressure is known, the corresponding evaporation temperature can be obtained by a table or a calculation formula preset in the air conditioner.

And 220, determining the suction superheat degree of the air conditioner according to the suction temperature and the evaporation temperature.

Wherein the suction superheat is a temperature difference between the suction temperature and the evaporation temperature.

Therefore, the suction superheat degree can be directly calculated through a table look-up or a calculation formula, and the accuracy of the suction superheat degree can be ensured; thus, the measuring speed and the measuring accuracy are improved.

Optionally, as shown in fig. 8, after determining the suction superheat of the air conditioner according to the suction pressure and the suction temperature, the step 200 further includes:

step 400, if the suction superheat degree is greater than a second temperature threshold and less than or equal to a third temperature threshold, closing the electronic expansion valve assembly 5, wherein the first temperature threshold is less than the second temperature threshold, and the third temperature threshold is less than the fourth temperature threshold.

The temperature greater than the second temperature threshold and less than or equal to the third temperature threshold means that the suction superheat degree of the refrigerant in the muffler 32 is maintained in a suitable state, and at this time, the electronic expansion valve assembly 5 is closed and is not adjusted. Therefore, when the suction superheat degree enters the proper temperature, the adjustment is stopped, so that the suction superheat degree can be kept in the proper temperature range, on one hand, the phenomenon that the reliability of the compressor 3 is damaged by the excessively high or excessively low suction superheat degree is avoided, and on the other hand, the working performance of the air conditioner can be kept in the maximum range.

It should be noted that the compressor 3 has the highest performance when the suction superheat is 0 ℃, so that the suction superheat is maintained in an appropriate temperature range, and the compressor 3 and the air conditioner can maintain the highest performance to the maximum.

Optionally, as shown in fig. 9, after determining the suction superheat of the air conditioner according to the suction pressure and the suction temperature, the step 200 further includes:

and 500, if the suction superheat degree is greater than the first temperature threshold and less than or equal to the second temperature threshold, controlling the electronic expansion valve assembly 5 to keep the operation state at the previous moment.

If the suction superheat is less than the first temperature threshold, the electronic expansion valve assembly 5 is in a large-opening operation state, so that the suction superheat is continuously increased; if the suction superheat degree is larger than the second temperature threshold value, the temperature is already in the proper temperature range, and the electronic expansion valve assembly 5 is in a closed state;

the above-mentioned control of the electronic expansion valve assembly 5 maintains the operation state at the previous time, that is, if the suction superheat degree is greater than the second temperature threshold and continuously decreases, and then it decreases to be less than the second temperature threshold, the electronic expansion valve assembly 5 still maintains the closing state until the suction superheat degree decreases to be less than the first temperature threshold (after that, the operation state of the electronic expansion valve assembly 5 is executed according to the setting); if the suction superheat is lower than the first temperature threshold and is continuously increased, the suction superheat is increased to be higher than the first temperature threshold, and the electronic expansion valve assembly 5 is still in a large-opening operation state until the suction superheat is increased to be higher than the second temperature threshold (after that, the operation state of the electronic expansion valve assembly 5 is performed according to the setting).

The adjustment of the electronic expansion valve assembly 5 is determined based on the suction superheat degree under the current condition, the suction superheat degree after adjustment is influenced to change, and the changed suction superheat degree determines a new adjustment state of the electronic expansion valve again, so that the mechanism for adjusting through feedback has certain unpredictability, the situation of repeated fluctuation at adjacent temperatures of different adjustments is easily caused, further frequent start and stop operations of the adjustment of the electronic expansion valve assembly 5 are caused, the adjustment of the suction superheat degree is influenced, and the service life and the reliability of the electronic expansion valve are seriously influenced.

Therefore, the area between the first temperature threshold and the second temperature threshold is set as the buffer area, so that the repeated starting and stopping conditions of the electronic expansion valve assembly 5 caused by temperature fluctuation can be avoided, the smooth adjustment of the suction superheat degree is ensured, and the possibility that the service life is influenced by frequent starting and stopping is eliminated.

Optionally, as shown in fig. 10, after determining the suction superheat of the air conditioner according to the suction pressure and the suction temperature, the step 200 further includes:

and 600, if the suction superheat degree is greater than the third temperature threshold and less than or equal to the fourth temperature threshold, controlling the electronic expansion valve assembly 5 to keep the operation state at the previous moment.

If the suction superheat degree is greater than the fourth temperature threshold, the electronic expansion valve assembly 5 is in a small-opening operation state, so that the suction superheat degree is continuously reduced; if the suction superheat degree is less than the third temperature threshold value, the suction superheat degree is already in a proper temperature range, and the electronic expansion valve assembly 5 is in a closed state;

the above-mentioned control of the electronic expansion valve assembly 5 maintains the operation state at the previous time, that is, if the suction superheat is greater than the fourth temperature threshold and continuously decreases, and then it decreases to be less than the fourth temperature threshold, the electronic expansion valve assembly 5 is still in the operation state of small opening degree until the suction superheat decreases to be less than the third temperature threshold (after that, the operation state of the electronic expansion valve assembly 5 is executed according to the setting); if the suction superheat is less than the third temperature threshold and is increasing, then when it increases above the third temperature threshold, the electronic expansion valve assembly 5 remains closed until the suction superheat increases above the fourth temperature threshold (after which the operating state of the electronic expansion valve assembly 5 is performed according to the aforementioned setting).

Therefore, the area between the third temperature threshold and the fourth temperature threshold is set as the buffer area, so that the repeated starting and stopping conditions of the electronic expansion valve assembly 5 caused by temperature fluctuation can be avoided, the smooth adjustment of the suction superheat degree is ensured, and the possibility that the service life is influenced by frequent starting and stopping is eliminated.

Optionally, the first temperature threshold is in a range of-0.8 ° - (-0.3 ℃), and preferably-0.5 ℃. The existing compressor 3 is provided with a gas-liquid separator, so that the normal working state can be kept under the condition of slightly low suction superheat; meanwhile, the setting can also make the air conditioner work for a longer time within the optimal range of performance and reliability (0.5-0 ℃ can also be considered as the optimal range).

Optionally, the value range of the second temperature threshold is-0.2 ℃ to 0.2 ℃, and preferably 0 ℃. When the suction superheat degree is 0 ℃, the performance and the reliability of the air conditioner are optimal, so the threshold value is set, and the air conditioner can work in the range of optimal performance and reliability.

Optionally, the value range of the third temperature threshold is 1.8 ℃ to 2.2 ℃, and preferably 2 ℃. The threshold value is set, so that the air conditioner can work in a range with better performance and reliability.

Optionally, the value range of the fourth temperature threshold is 2.3 ℃ to 2.7 ℃, and is preferably 2.5 ℃. The threshold value is set, so that the air conditioner can execute adjustment measures in time after exceeding the range, and the work is ensured to be in a range with better performance and reliability.

The embodiment of the disclosure provides an air conditioner superheat degree adjusting device, which is used for executing the air conditioner superheat degree adjusting method in the invention, and the air conditioner superheat degree adjusting device is described in detail below.

As shown in fig. 11, the air conditioner superheat degree adjusting device includes:

a detection unit 11 for detecting a suction pressure and a suction temperature of the compressor 3;

a determination unit 12 for determining a suction superheat of the air conditioner based on the suction pressure and the suction temperature;

a control unit 13, configured to open the electronic expansion valve assembly 5 if the suction superheat degree is less than or equal to a first temperature threshold or greater than a fourth temperature threshold, where the first temperature threshold is less than the fourth temperature threshold.

Therefore, when the suction superheat degree is too high or too low, the electronic expansion valve assembly 5 is opened to adjust the suction superheat degree in the return air pipe 32 to return the suction superheat degree to a proper state, so that the condition that the suction superheat degree is too high or too low is avoided, and the normal operation of the air conditioner is ensured. In addition, by adjusting the degree of suction superheat, it is possible to avoid a decrease in reliability of the compressor 3 due to an excessively high or excessively low degree of suction superheat.

Optionally, the control unit 13 is further configured to: if the suction superheat degree is less than or equal to the first temperature threshold, opening the electronic expansion valve assembly 5 and controlling the opening degree of the electronic expansion valve assembly 5 to keep a large opening degree; and if the suction superheat degree is greater than the fourth temperature threshold value, opening the electronic expansion valve assembly 5 and controlling the opening degree of the electronic expansion valve assembly 5 to keep a small opening degree.

Optionally, the determining unit 12 is further configured to: determining the evaporation temperature of the evaporator according to the suction pressure; and determining the suction superheat degree of the air conditioner according to the suction temperature and the evaporation temperature.

Optionally, the control unit 13 is further configured to: and if the suction superheat degree is greater than a second temperature threshold and less than or equal to a third temperature threshold, closing the electronic expansion valve assembly 5, wherein the first temperature threshold is less than the second temperature threshold, and the third temperature threshold is less than the fourth temperature threshold.

Optionally, the control unit 13 is further configured to: and if the suction superheat degree is greater than the first temperature threshold value and less than or equal to the second temperature threshold value, controlling the electronic expansion valve assembly 5 to keep the operation state at the previous moment.

Optionally, the control unit 13 is further configured to: and if the suction superheat degree is greater than the third temperature threshold value and less than or equal to the fourth temperature threshold value, controlling the electronic expansion valve assembly 5 to keep the operation state at the previous moment.

The embodiment of the disclosure also provides a computer-readable storage medium, which stores instructions, and when the instructions are loaded and executed by a processor, the method for adjusting the superheat degree of the air conditioner can be implemented.

The technical solution of the embodiment of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be an air conditioner, a refrigeration device, a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the method of the embodiment of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

Therefore, when the suction superheat degree is too high or too low, the electronic expansion valve assembly 5 is opened to adjust the suction superheat degree in the return air pipe 32 to return the suction superheat degree to a proper state, so that the condition that the suction superheat degree is too high or too low is avoided, and the normal operation of the air conditioner is ensured. In addition, by adjusting the degree of suction superheat, it is possible to avoid a decrease in reliability of the compressor 3 due to an excessively high or excessively low degree of suction superheat.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.