CN110186150B

CN110186150B - Operation control method, control device, air conditioner, and computer-readable storage medium

Info

Publication number: CN110186150B
Application number: CN201910472140.1A
Authority: CN
Inventors: 徐振坤; 杜顺开; 蔡志昇; 朱兴丹
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2021-06-29
Anticipated expiration: 2039-05-31
Also published as: CN110186150A

Abstract

The invention provides an operation control method, an operation control device, an air conditioner and a computer readable storage medium, wherein the operation control method comprises the following steps: acquiring working parameters of a heat exchanger, and judging whether the air conditioner works abnormally according to the working parameters; if the air conditioner is judged to be abnormal, controlling to increase the opening degree of the throttling device so as to increase the refrigerant flow according to a first speed; the opening degree of the throttling device is increased to a first opening degree, and whether the air conditioner still works abnormally is judged; and if the air conditioner still works abnormally, continuously controlling the throttling device to adjust between the first opening degree and the second opening degree so as to increase the refrigerant flow according to a second speed until the heat exchanger is detected to be recovered to be normal. By the technical scheme of the invention, the preparation cost is not increased, and the normal use of the air conditioner by a user is not influenced.

Description

Operation control method, control device, air conditioner, and computer-readable storage medium

Technical Field

The invention relates to the technical field of air conditioners, in particular to an operation control method, an operation control device, an air conditioner and a computer readable storage medium.

Background

When the air conditioner is in operation, many abnormal phenomena may occur, such as high load, low load and frosting, for example, in the case of a heat exchanger, although there are corresponding solutions, the above solutions usually require bypass unloading or direct down-conversion shutdown, resulting in the following disadvantages:

(1) bypass unloading can result in increased manufacturing costs;

(2) the shutdown affects the cooling or heating effect of the air conditioner.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

To this end, it is an object of the present invention to provide an operation control method.

Another object of the present invention is to provide an air conditioner.

It is another object of the present invention to provide a computer-readable storage medium.

In order to achieve the above object, a technical solution of a first aspect of the present invention provides an operation control method, which is applied to an air conditioner, and includes: acquiring working parameters of a heat exchanger, and judging whether the air conditioner works abnormally according to the working parameters; if the air conditioner is judged to be abnormal, controlling to increase the opening degree of the throttling device so as to increase the refrigerant flow according to a first speed; the opening degree of the throttling device is increased to a first opening degree, and whether the air conditioner still works abnormally is judged; and if the air conditioner still works abnormally, continuing to control the throttling device to adjust between the first opening and the second opening so as to enable the refrigerant flow to increase according to a second rate until the heat exchanger is detected to be recovered to be normal, wherein the second rate is greater than the first rate, and the ratio of the refrigerant flow corresponding to the second opening to the refrigerant flow corresponding to the first opening is greater than or equal to 3.34 and less than or equal to 100.

In the scheme, whether the air conditioner is abnormal in the operation process is determined by obtaining the working parameters of the heat exchanger, on one hand, the abnormal phenomenon in the operation process of the air conditioner is easily and reliably monitored, on the other hand, after the abnormal operation of the air conditioner is determined, the abnormal phenomenon is eliminated or relieved by controlling and adjusting the opening degree of the throttling device, wherein the opening degree before the abnormal operation of the air conditioner is detected is determined as an initial opening degree, namely, the opening degree is adjusted from the initial opening degree, the opening degree adjustment of the throttling device at least comprises two stages, the first stage is from the initial opening degree to the first opening degree, the second stage is from the first opening degree to the second opening degree, the flow rate of the refrigerant in the first stage is increased at a first speed, the flow rate of the refrigerant in the second stage is increased at a second speed, the second speed is greater than the first speed, and the ratio between the flow rate corresponding to the second opening degree and the flow rate corresponding to the first opening degree is [3.34, 100, on the one hand, when the current abnormal problem cannot be solved or alleviated after the refrigerant flow rate is increased at the first rate, the abnormal problem can be solved or alleviated by further adjusting the opening degree of the throttling device at the second rate, on the other hand, compared with the solution of the related art, a bypass for performing the unloading operation does not need to be separately provided, so that the manufacturing cost is not increased, and on the other hand, compared with the solution of the related art, the shutdown operation does not need to be performed, so that the normal use of the user is not affected.

Wherein, as can be understood by those skilled in the art, when the opening degree of the throttling device is adjusted to increase the refrigerant flow rate at the first rate and the second rate respectively, the throttling device with a specified structure can be precisely controlled, for example, the flow area of the throttling device takes the first opening degree as a critical point, and the flow area of the refrigerant in the throttling device is continuously increased at the third rate corresponding to the first rate before reaching the first opening degree, so as to increase the refrigerant flow rate flowing through the throttling device, thereby reducing the pressure drop before and after the throttling device, and the sudden change occurs at the first opening degree, and the flow area of the refrigerant in the throttling device is continuously increased at the fourth rate corresponding to the second rate, thereby increasing the refrigerant flow rate flowing through the throttling device, further reducing the pressure drop before and after the throttling device, and improving the control mode of the opening degree step number, for example, when the first opening degree is reached, the amplitude of each opening degree is increased to realize the sudden change of the refrigerant flow rate increase.

It will also be appreciated by those skilled in the art that after defining the first rate and the second rate, an adjustment rate greater than the second rate may be further defined to further shorten the adjustment time of the restriction device.

In addition, the throttling device may be a throttling valve.

In the foregoing technical solution, optionally, a ratio between a refrigerant flow rate corresponding to the second opening degree and a refrigerant flow rate corresponding to the first opening degree is greater than or equal to 3.35 and less than or equal to 30.

In this embodiment, on the basis of limiting the ratio between the refrigerant flow rate corresponding to the second opening degree and the refrigerant flow rate corresponding to the first opening degree, the range to which the ratio belongs is further reduced, on one hand, the accuracy of control can be improved by increasing the lower threshold (from 3.34 to 3.35), and on the other hand, the difficulty of control is reduced by reducing the upper threshold (from 100 to 30).

In the foregoing technical solution, optionally, the air conditioner is further provided with a compressor respectively connected to the first heat exchanger and the second heat exchanger, and if it is determined that the air conditioner is abnormal in operation, the operation control method further includes: controlling the compressor to perform a down-conversion operation.

In the scheme, when the working abnormality of the air conditioner is judged and the throttling device is adjusted, the frequency reduction operation is performed on the compressor to reduce the heat exchange quantity of the heat exchanger, the frequency reduction operation is performed on the compressor, specifically, the rotating speed of the compressor during operation is adjusted, the flow change is realized through the rotating speed adjustment, the effect of adjusting the load is achieved, and therefore the abnormal phenomenon detected based on the working parameters of the heat exchanger can be eliminated or relieved by combining the opening adjustment operation of the throttling device and the throttling device through the load adjustment.

In the foregoing technical solution, optionally, before obtaining the working parameters of the heat exchanger and determining whether the air conditioner works abnormally according to the working parameters, the method further includes: and acquiring the opening degree of the throttling device, and determining the opening degree as an initial opening degree, wherein the initial opening degree is smaller than the first opening degree, the first opening degree is larger than or equal to 150 steps and smaller than or equal to 400 steps, so that the flow rate of the refrigerant is increased between the initial opening degree and the first opening degree according to the first speed, and the flow rate of the refrigerant is smaller than or equal to 8L/min under the initial opening degree.

In this scheme, the initial opening degree is the opening degree of the throttle valve for controlling the normal operation of the air conditioner in the related art, that is, the initial opening degree in the adjusting method of the throttle valve in the present application, satisfies the normal operation of the air conditioner by limiting the range of the initial opening degree, further, by limiting the range of the first opening degree between steps [150, 400], a sufficient adjusting space can be provided for the adjusting process of the first stage (i.e., increasing the refrigerant flow at the first rate), and if the working abnormality of the air conditioner can be eliminated when the first opening degree is reached, the subsequent adjusting operation may not be performed.

The opening value between the first opening degree and the initial opening degree is preferably a value in the middle of the above range.

Specifically, the throttle device can be adjusted at a first rate between the initial opening degree and the first opening degree by limiting the initial opening degree, the first opening degree and the second opening degree, and the throttle device can be adjusted at a second rate between the first opening degree and the second opening degree, wherein the initial opening degree can be understood as the minimum opening degree of the throttle device during operation to correspond to the minimum refrigerant flow rate, and further, the operation control scheme defined in the application can be applied to a situation (low-cost one-to-one) that the shut-down (for example, one-to-many) and the minimum opening degree have a certain flow rate.

The initial opening degree is smaller than the first opening degree, and the range of the initial opening degree may be specifically greater than 0 and smaller than 150 steps. During the normal operation of the air conditioner, the initial opening may be greater than 0 and less than or equal to 100 steps, so as to correspond to a refrigerant flow rate less than or equal to 8L/min. In the foregoing technical solution, optionally, if the air conditioner is still abnormal in operation, the controlling the throttle device to adjust between the first opening degree and the second opening degree includes: and continuously controlling the throttling device to adjust between the first opening degree and the second opening degree according to a preset amplification range, wherein the preset amplification range is greater than or equal to 50 steps and less than or equal to 350 steps.

In the scheme, if the refrigerant flow is controlled to be increased at the second speed, the range of the opening degree of the corresponding control throttling device is between [50 and 350], on one hand, the abnormal phenomenon of the air conditioner can be eliminated or relieved by adjusting the throttling device in the range, and on the other hand, the negative influence on the performance of the air conditioner caused by the overlarge opening degree of the throttling device is also prevented.

In the foregoing technical solution, optionally, if the air conditioner is still abnormal in operation, the controlling the throttling device to adjust between the first opening degree and the second opening degree continuously to increase the refrigerant flow rate according to a second rate specifically includes: and increasing the refrigerant flow to be less than or equal to a target flow according to the second speed, wherein the target flow is the refrigerant flow corresponding to the second opening degree, and the target flow is determined according to the rated heat exchange quantity of the air conditioner.

In the scheme, the normal operation of the air conditioner can be ensured by limiting the upper limit value of the flow of the refrigerant under the second opening degree, and the requirement for solving the abnormal working condition of the air conditioner can be met by limiting the target flow under the premise that the flow of the refrigerant is less than or equal to the target flow under the normal condition, wherein the target flow is determined according to the rated heat exchange quantity of the air conditioner, so that the normal operation of indoor refrigeration or heating operation is ensured while the problem of the abnormal working condition of the air conditioner is solved, and the comfort level of a user for using the air conditioner can be further ensured.

The different air conditioner models have different heat exchange capacities, and the heat exchange capacity can be represented by a rated heat exchange amount, for example, the air conditioner is 35-grade, and the rated refrigerating capacity of the air conditioner is 3500W, which can also be called as 1.5 HP.

Specifically, in the cooling mode, the rated heat exchange amount is the rated cooling amount, for example, the rated cooling amount is 4500W or lower than 4500W, the corresponding target flow rate is 70L/min, and if the rated cooling amount is 4500W to 14000W, the corresponding target flow rate is 80L/min.

In the foregoing technical solution, optionally, the obtaining of the working parameter of the heat exchanger and determining whether the air conditioner works abnormally according to the working parameter specifically include: acquiring the temperature of a coil of the heat exchanger to judge whether the air conditioner works abnormally according to the temperature of the coil; and/or acquiring the working pressure of the heat exchanger to judge whether the air conditioner works abnormally according to the working pressure.

In the foregoing technical solution, optionally, the obtaining of the coil temperature of the heat exchanger to determine whether the air conditioner works abnormally according to the coil temperature specifically includes: respectively acquiring a first coil temperature of the first heat exchanger and a second coil temperature of the second heat exchanger; if the first heat exchanger is determined to be in the pressure abnormal state according to the temperature of the first coil, determining that the first heat exchanger works abnormally; and if the second heat exchanger is determined to be in the abnormal pressure state according to the temperature of the second coil, determining that the second heat exchanger works abnormally.

In this scheme, as an expression mode of the air conditioner system operation anomaly, the heat exchanger can have a pressure anomaly phenomenon, for example, if the temperature of the heat exchanger tube temperature is too high, the pressure in the heat exchanger can be caused to be too high, the pressure in the heat exchanger is too high, not only can the normal operation of the air conditioner be influenced, but also the normal service life of the heat exchanger can be influenced, therefore, the heat exchanger generates a high-pressure phenomenon to determine that the air conditioner has an abnormal work, in addition, if the amount of refrigerant in the heat exchanger is insufficient, the heat exchanger generates a low-pressure phenomenon, at the moment, the temperature of the heat exchanger tube can be caused to be too low, and.

In the above technical solution, optionally, the first heat exchanger is an indoor heat exchanger, the second heat exchanger is an outdoor heat exchanger, the coil temperature of the heat exchanger is obtained, so as to determine whether the air conditioner works abnormally according to the coil temperature, and the method specifically includes: the air conditioner is in a heating mode, the temperature of a coil of the second heat exchanger is obtained, if the temperature of the coil of the second heat exchanger is smaller than or equal to the freezing point temperature, it is judged that the second heat exchanger has a frosting risk, and the second heat exchanger is determined to work abnormally.

In the scheme, in the heating mode of the air conditioner, if the frosting risk of the outdoor heat exchanger is detected, the abnormal operation of the air conditioner system can be determined, the frosting phenomenon is relieved by adjusting the opening degree of the throttling device, the air conditioner is restored to a normal state by combining the defrosting operation, and the defrosting function at low cost is further realized.

In the foregoing technical solution, optionally, if the air conditioner is still abnormal in operation, the method further includes, if the air conditioner is still abnormal, continuously controlling the throttling device to adjust between the first opening degree and the second opening degree, so that the refrigerant flow rate is increased according to a second rate until it is detected that the heat exchanger is recovered to be normal: and after the refrigerant flow is increased according to the second rate, controlling to start defrosting operation until the heat exchanger is detected to be recovered to be normal.

In the scheme, if the defrosting risk is detected, the opening degree of the throttling device is increased under control, and meanwhile the defrosting operation is controlled to be started, so that the simple and reliable control process of the defrosting operation is realized.

In the foregoing technical solution, optionally, the air conditioner further includes a four-way valve for adjusting a flow direction of a refrigerant, and if it is determined that the air conditioner is abnormal in operation, the method includes controlling to increase an opening degree of the throttling device so as to increase a flow rate of the refrigerant according to a first rate, and specifically includes: if the second heat exchanger is determined to have the frosting risk, acquiring outdoor humidity, outdoor temperature, indoor temperature and air conditioner operation time; determining a frosting metric value according to the outdoor humidity, the outdoor temperature, the indoor temperature and the operation duration; judging the relation between the frosting metric value and the frosting threshold value; and if the frosting metric value is larger than the frosting threshold value, controlling the four-way valve to adjust the flow direction of the refrigerant, and controlling to increase the opening degree of the throttling device so as to increase the flow rate of the refrigerant according to the first speed to execute reversing defrosting operation.

In the scheme, the outdoor humidity, the outdoor temperature and the indoor temperature are further acquired, the frosting metric value is determined based on the outdoor humidity, the outdoor temperature and the indoor temperature, the frosting metric value is used for measuring the frosting degree, and the specific defrosting mode is determined by combining the preset frosting threshold value so as to obtain a good defrosting effect.

Specifically, the larger the outdoor humidity is, the lower the outdoor temperature is, and the smaller the temperature difference between the indoor temperature and the outdoor temperature is, the larger the settlement amount is, and the further comparison with the preset frosting threshold is performed to determine the specific defrosting mode, so as to ensure that a better defrosting effect is obtained, and further, the normal use of the air conditioner by the user can not be influenced.

In the foregoing technical solution, optionally, the method further includes: and if the frosting metric value is smaller than or equal to the frosting threshold value, maintaining the current refrigerant flow direction, and controlling the opening degree of the throttling device to be increased to be larger than or equal to the first opening degree and smaller than or equal to the second opening degree so as to execute the defrosting operation.

In the scheme, if the frosting metric value is smaller than or equal to the frosting threshold value, the current frosting degree is relatively low, and the heating mode can be continuously operated at the moment, so that the indoor heating operation can be ensured not to be interrupted, and further, the opening degree of the throttling device is firstly adjusted to the first opening degree, so that the opening degree is further controlled to be increased on the basis of the first opening degree, and the defrosting requirement is met.

In the foregoing technical solution, optionally, the throttling device includes a valve seat and a valve needle that is controlled to reciprocate by excitation, the valve seat is provided with an orifice that is engaged with the valve needle to define a refrigerant flow area by the valve needle and the orifice, wherein the opening degree of the throttling device is controlled to increase to a first opening degree, the flow area increases according to a third rate, from the first opening degree, the flow area increases according to a fourth rate, and a ratio between the flow area corresponding to the second opening degree and the flow area corresponding to the first opening degree is the same as a ratio between a refrigerant flow rate corresponding to the second opening degree and a refrigerant flow rate corresponding to the first opening degree.

The third rate is an increase rate of a refrigerant flow area corresponding to the first rate, and the fourth rate is an increase rate of a refrigerant flow area corresponding to the second rate.

In this aspect, in order to realize that the refrigerant flow rate increases at the first rate when the throttle device is adjusted between the first opening degree and the first opening degree, and the refrigerant flow rate increases at the second rate when the throttle device is adjusted at or above the first opening degree, the flow area of the refrigerant defined between the throttle hole and the needle may be limited, that is, the flow area may increase at the third rate when the throttle device is adjusted between the first opening degree and the first opening degree, and the flow area may increase at the fourth rate when the throttle device is continuously adjusted based on the first opening degree, and the fourth rate/the third rate may be equal to the second rate/the first rate, and the refrigerant flow rate may be adjusted at different rates by adjusting the flow area.

In the above technical solution, optionally, the free end of the valve needle includes any one of a cone structure, a circular truncated cone structure and a convex arc surface structure; the structure of with free end connection is the round platform structure, the round platform structure is one or more, the generating line of round platform structure is constructed for sharp and/or pitch arc, the tapering of free end is greater than the tapering of round platform structure, wherein, if throttling arrangement's aperture increases to first aperture, then free end with the round platform structure is connected the face with the orifice is injectd flow area.

In this scheme, the needle that can realize above-mentioned speed regulation has multiple structural style, through the injecing to the needle structure, realizes the regulation to flow area when adjusting the aperture to satisfy the refrigerant flow and adjust through the regulation rate of difference when throttling arrangement is in different regulation intervals, and then can solve the unusual problem of air conditioner operation high-efficiently.

In the foregoing technical solution, optionally, if the air conditioner is still abnormal in operation, the controlling the throttle device to adjust between the first opening degree and the second opening degree includes: if the refrigerant flows in along the direction of the valve needle and flows out along the direction vertical to the valve needle, continuously controlling the excitation speed of the throttling device regulated between the first opening degree and the second opening degree to be less than or equal to 90 pps; and if the refrigerant flows in the direction vertical to the valve needle and flows out in the direction of the valve needle, continuously controlling the excitation speed of the throttling device regulated between the first opening degree and the second opening degree to be greater than or equal to 30 pps.

In the scheme, when the refrigerant is in different flow directions, the control requirement of the throttling device is met by controlling the excitation speed to be within a limited range.

A second aspect of the present invention provides an operation control device for an air conditioner, including: a processor capable of, when executing a computer program: acquiring working parameters of a heat exchanger, and judging whether the air conditioner works abnormally according to the working parameters; if the air conditioner is judged to be abnormal, controlling to increase the opening degree of the throttling device so as to increase the refrigerant flow according to a first speed; the opening degree of the throttling device is increased to a first opening degree, and whether the air conditioner still works abnormally is judged; and if the air conditioner still works abnormally, continuing to control the throttling device to adjust between the first opening and the second opening so as to enable the refrigerant flow to increase according to a second rate until the heat exchanger is detected to be recovered to be normal, wherein the second rate is greater than the first rate, and the ratio of the refrigerant flow corresponding to the second opening to the refrigerant flow corresponding to the first opening is greater than or equal to 3.34 and less than or equal to 100.

In addition, the throttling device may be a throttling valve.

In the above technical solution, optionally, the air conditioner is further provided with a compressor respectively connected to the first heat exchanger and the second heat exchanger, and the processor is specifically configured to: controlling the compressor to perform a down-conversion operation.

The initial opening degree is smaller than the first opening degree, and the range of the initial opening degree may be specifically greater than 0 and smaller than 150 steps. During the normal operation of the air conditioner, the initial opening may be greater than 0 and less than or equal to 100 steps, so as to correspond to a refrigerant flow rate less than or equal to 8L/min.

In the foregoing technical solution, optionally, the processor is specifically configured to: and continuously controlling the throttling device to adjust between the first opening degree and the second opening degree according to a preset amplification range, wherein the preset amplification range is greater than or equal to 50 steps and less than or equal to 350 steps.

In the foregoing technical solution, optionally, the processor is specifically configured to: and increasing the refrigerant flow to be less than or equal to a target flow according to the second speed, wherein the target flow is the refrigerant flow corresponding to the second opening degree, and the target flow is determined according to the rated heat exchange quantity of the air conditioner.

In the foregoing technical solution, optionally, the processor is specifically configured to: acquiring the temperature of a coil of the heat exchanger to judge whether the air conditioner works abnormally according to the temperature of the coil; and/or acquiring the working pressure of the heat exchanger to judge whether the air conditioner works abnormally according to the working pressure.

In the foregoing technical solution, optionally, the processor is specifically configured to: respectively acquiring a first coil temperature of the first heat exchanger and a second coil temperature of the second heat exchanger; if the first heat exchanger is determined to be in the pressure abnormal state according to the temperature of the first coil, determining that the first heat exchanger works abnormally; and if the second heat exchanger is determined to be in the abnormal pressure state according to the temperature of the second coil, determining that the second heat exchanger works abnormally.

In the above technical solution, optionally, the first heat exchanger is an indoor heat exchanger, the second heat exchanger is an outdoor heat exchanger, and the processor is specifically configured to: the air conditioner is in a heating mode, the temperature of a coil of the second heat exchanger is obtained, if the temperature of the coil of the second heat exchanger is smaller than or equal to the freezing point temperature, it is judged that the second heat exchanger has a frosting risk, and the second heat exchanger is determined to work abnormally.

In the foregoing technical solution, optionally, the processor is specifically configured to: and after the refrigerant flow is increased according to the second rate, controlling to start defrosting operation until the heat exchanger is detected to be recovered to be normal.

In the above technical solution, optionally, the air conditioner further includes a four-way valve for adjusting a flow direction of the refrigerant, and the processor is specifically configured to: if the second heat exchanger is determined to have the frosting risk, acquiring outdoor humidity, outdoor temperature, indoor temperature and air conditioner operation time; determining a frosting metric value according to the outdoor humidity, the outdoor temperature, the indoor temperature and the operation duration; judging the relation between the frosting metric value and the frosting threshold value; and if the frosting metric value is larger than the frosting threshold value, controlling the four-way valve to adjust the flow direction of the refrigerant, and controlling to increase the opening degree of the throttling device so as to increase the flow rate of the refrigerant according to the first speed to execute reversing defrosting operation.

In the foregoing technical solution, optionally, the processor is specifically configured to: and if the frosting metric value is smaller than or equal to the frosting threshold value, maintaining the current refrigerant flow direction, and controlling the opening degree of the throttling device to be increased to be larger than or equal to the first opening degree and smaller than or equal to the second opening degree so as to execute the defrosting operation.

In the foregoing technical solution, optionally, the processor is specifically configured to: if the refrigerant flows in along the direction of the valve needle and flows out along the direction vertical to the valve needle, continuously controlling the excitation speed of the throttling device regulated between the first opening degree and the second opening degree to be less than or equal to 90 pps; and if the refrigerant flows in the direction vertical to the valve needle and flows out in the direction of the valve needle, continuously controlling the excitation speed of the throttling device regulated between the first opening degree and the second opening degree to be greater than or equal to 30 pps.

A third aspect of the present invention provides an air conditioner, including: the technical solution of the second aspect provides an operation control device.

The air conditioner can be a split air conditioner or an integral air conditioner.

An embodiment of the fourth aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed, the computer program implements the steps of the operation control method according to any one of the above technical solutions.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 shows a schematic flow diagram of an operation control method according to an embodiment of the invention;

FIG. 2 is a diagram illustrating a refrigerant flow characteristic according to an embodiment of the present invention;

FIG. 3 shows a schematic flow diagram of an operation control method according to another embodiment of the invention;

FIG. 4 shows a schematic flow diagram of an operation control method according to yet another embodiment of the present invention;

FIG. 5 shows a schematic flow diagram of an operation control method according to yet another embodiment of the present invention;

FIG. 6 shows a schematic view of a flow area of a restriction device according to an embodiment of the invention;

FIG. 7 shows a schematic view of a throttle device according to an embodiment of the present invention;

fig. 8 shows a schematic configuration of a throttle device according to another embodiment of the present invention;

fig. 9 shows a schematic construction of a throttle device according to a further embodiment of the invention;

fig. 10 is a schematic flow diagram of a refrigerant flowing in a throttling device according to an embodiment of the invention;

FIG. 11 shows a schematic block diagram of an operation control device according to an embodiment of the present invention;

fig. 12 is a schematic structural view illustrating an air conditioner according to an embodiment of the present invention;

fig. 13 is a schematic structural view showing an air conditioner according to another embodiment of the present invention

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

As shown in fig. 1, an operation control method according to an embodiment of the present invention is applied to an air conditioner, and includes:

step 102: acquiring working parameters of a heat exchanger, and judging whether the air conditioner works abnormally according to the working parameters;

104, if the air conditioner is judged to be abnormal, controlling to increase the opening degree of the throttling device so as to increase the refrigerant flow according to a first speed;

step 106, increasing the opening degree of the throttling device to a first opening degree, and judging whether the air conditioner still works abnormally;

and 108, if the air conditioner still works abnormally, continuing to control the throttling device to adjust between the first opening and the second opening so as to enable the refrigerant flow to increase according to a second rate until the heat exchanger is detected to be recovered to be normal, wherein the second rate is greater than the first rate, and the ratio of the refrigerant flow corresponding to the second opening to the refrigerant flow corresponding to the first opening is greater than or equal to 3.34 and less than or equal to 100.

In this embodiment, whether an abnormality occurs in the operation of the air conditioner is determined by obtaining operating parameters of the heat exchanger, on one hand, it is beneficial to simply and reliably monitor the abnormality occurring in the operation of the air conditioner, and on the other hand, after it is determined that the abnormality occurs in the air conditioner, the abnormality is eliminated or alleviated by controlling and adjusting the opening degree of the throttling device, wherein the opening degree before the abnormality occurs in the operation of the air conditioner is determined as an initial opening degree, that is, the opening degree is adjusted from the initial opening degree, and the adjustment of the opening degree of the throttling device at least includes two stages, a first stage from the initial opening degree to a first opening degree, a second stage from the first opening degree to a second opening degree, a first stage refrigerant flow rate increases, a second stage refrigerant flow rate increases at a second rate, the second refrigerant rate is greater than the first rate, and a ratio between the flow rate corresponding to the second opening degree and the flow rate corresponding to the first opening degree is [3.34, 100, on the one hand, when the current abnormal problem cannot be solved or alleviated after the refrigerant flow rate is increased at the first rate, the abnormal problem can be solved or alleviated by further adjusting the opening degree of the throttling device at the second rate, on the other hand, compared with the solution of the related art, a bypass for performing the unloading operation does not need to be separately provided, so that the manufacturing cost is not increased, and on the other hand, compared with the solution of the related art, the shutdown operation does not need to be performed, so that the normal use of the user is not affected.

In addition, the throttling device may be a throttling valve.

In the above embodiment, optionally, a ratio between the refrigerant flow rate corresponding to the second opening degree and the refrigerant flow rate corresponding to the first opening degree is greater than or equal to 3.35 and less than or equal to 30.

In this embodiment, after the ratio between the refrigerant flow rate corresponding to the second opening degree and the refrigerant flow rate corresponding to the first opening degree is defined, the range of the ratio is further reduced, on one hand, the accuracy of the control can be improved by increasing the lower threshold (from 3.34 to 3.35), and on the other hand, the difficulty of the control is reduced by reducing the upper threshold (from 100 to 30).

In the foregoing embodiment, optionally, the air conditioner is further provided with a compressor respectively connected to the first heat exchanger and the second heat exchanger, and if it is determined that the air conditioner is abnormal in operation, the operation control method further includes: controlling the compressor to perform a down-conversion operation.

In this embodiment, when the air conditioner is determined to be abnormal in operation and the throttling device is adjusted, the frequency reduction operation is performed on the compressor to reduce the heat exchange amount of the heat exchanger, the frequency reduction operation is performed on the compressor, specifically, the rotating speed of the compressor during operation is adjusted, the flow change is realized through the rotating speed adjustment, the effect of adjusting the load is achieved, and therefore, the abnormal phenomenon detected based on the working parameters of the heat exchanger due to the abnormality is eliminated or relieved by combining the throttling device and the opening adjustment operation of the throttling device through the load adjustment.

In the above embodiment, optionally, before obtaining the operating parameter of the heat exchanger and determining whether the air conditioner is abnormal according to the operating parameter, the method further includes: and acquiring the opening degree of the throttling device, and determining the opening degree as an initial opening degree, wherein the initial opening degree is smaller than the first opening degree, the first opening degree is larger than or equal to 150 steps and smaller than or equal to 400 steps, so that the flow rate of the refrigerant is increased between the initial opening degree and the first opening degree according to the first speed, and the flow rate of the refrigerant is smaller than or equal to 8L/min under the initial opening degree.

In this embodiment, the initial opening degree is the opening degree of the throttle valve that controls the normal operation of the air conditioner in the related art, that is, the initial opening degree in the adjusting method of the throttle valve in the present application, and satisfies the normal operation of the air conditioner by limiting the range of the initial opening degree, and further, by limiting the range of the first opening degree between steps [150, 400], a sufficient adjusting space can be provided for the first stage of the adjusting process (i.e., increasing the refrigerant flow rate at the first rate), and if the operational abnormality of the air conditioner can be eliminated when the first opening degree is reached, the subsequent adjusting operation may not be performed.

In the foregoing embodiment, optionally, if the air conditioner is still abnormally operated, the controlling the throttle device to adjust between the first opening degree and the second opening degree further includes: and continuously controlling the throttling device to adjust between the first opening degree and the second opening degree according to a preset amplification range, wherein the preset amplification range is greater than or equal to 50 steps and less than or equal to 350 steps.

In this embodiment, if the refrigerant flow rate is controlled to increase at the second rate, the range of the increase in the opening degree of the throttle device is controlled to be between [50 and 350], so that, on the one hand, it is possible to ensure that the abnormal phenomenon of the air conditioner can be eliminated or alleviated by adjusting the throttle device within the range, and on the other hand, it is also possible to prevent the performance of the air conditioner from being adversely affected by an excessively large increase in the opening degree of the throttle device.

In the above embodiment, optionally, if the air conditioner is still abnormally operated, the continuously controlling the throttling device to adjust between the first opening degree and the second opening degree to increase the refrigerant flow rate according to a second rate specifically includes: and increasing the refrigerant flow to be less than or equal to a target flow according to the second speed, wherein the target flow is the refrigerant flow corresponding to the second opening degree, and the target flow is determined according to the rated heat exchange quantity of the air conditioner.

In this embodiment, by limiting the upper limit value of the flow rate of the refrigerant at the second opening, normal operation of the air conditioner can be ensured, and by limiting the target flow rate, under a normal condition, on the premise that the flow rate of the refrigerant is less than or equal to the target flow rate, the requirement for solving the abnormal operation of the air conditioner can be met, wherein the target flow rate is determined according to the rated heat exchange capacity of the air conditioner, so that the problem of the abnormal operation of the air conditioner is solved, normal operation of indoor cooling or heating operation is ensured, and further, the comfort level of using the air conditioner by a user can be ensured.

In the foregoing embodiment, optionally, the obtaining of the working parameter of the heat exchanger and determining whether the air conditioner works abnormally according to the working parameter specifically include: acquiring the temperature of a coil of the heat exchanger to judge whether the air conditioner works abnormally according to the temperature of the coil; and/or acquiring the working pressure of the heat exchanger to judge whether the air conditioner works abnormally according to the working pressure.

Fig. 2 shows a flow characteristic having two or more segments, and the average rate of flow change between exv 0-exv 1 (i.e., the first rate) is less than the average rate of flow change between exv 1-exv 2 (i.e., the second rate).

Wherein exv0 is an initial opening degree, exv1 is a first opening degree, exv2 is a second opening degree, and when a ratio of a refrigerant flow rate corresponding to the second opening degree to a refrigerant flow rate corresponding to the first opening degree is k, Q2 is k × Q1, and k has a value in a range of 3.34 to 100, preferably 3.35 to 30.

In addition, the flow rate of the refrigerant passing through the throttling device under 0.1MPa needs to meet the following requirements: q0 is more than or equal to 0L/min and less than or equal to 8L/min, and in addition, the refrigerating capacity is divided according to the rated refrigerating capacity of the room air conditioner: q2 below 4500W is more than or equal to 70L/min; q2 of 4500-14000W is more than or equal to 80L/min

Preferably, the flow rate takes a selected intermediate value.

Further, the following relationship exists between the refrigerant flow rate and the opening degree:

step 0 is not less than exv0 is not more than 100; 150 steps are less than or equal to exv1 steps are less than or equal to 400 steps; and (3) not less than exv2-exv1 not less than 350 steps.

In the above embodiment, optionally, the obtaining of the coil temperature of the heat exchanger to determine whether the air conditioner works abnormally according to the coil temperature specifically includes: respectively acquiring a first coil temperature of the first heat exchanger and a second coil temperature of the second heat exchanger; if the first heat exchanger is determined to be in the pressure abnormal state according to the temperature of the first coil, determining that the first heat exchanger works abnormally; and if the second heat exchanger is determined to be in the abnormal pressure state according to the temperature of the second coil, determining that the second heat exchanger works abnormally.

In this embodiment, as an expression of the abnormal operation of the air conditioner system, the heat exchanger may have an abnormal pressure phenomenon, for example, if the temperature of the heat exchanger tube is too high, the pressure in the heat exchanger may be too high, and the pressure in the heat exchanger may not only affect the normal operation of the air conditioner, but also affect the normal service life of the heat exchanger, so that the heat exchanger may generate a high pressure phenomenon to determine that the air conditioner has an abnormal operation.

As shown in fig. 3, the operation control method in the present application is described by taking a high-pressure abnormality or a low-pressure abnormality of a heat exchanger as an example, and includes:

step 302, starting up and running;

step 304, detecting the coil temperature of the outdoor heat exchanger and/or the coil temperature of the indoor heat exchanger to judge whether the heat exchanger has high-pressure abnormity or low-pressure abnormity;

step 306, if the high-pressure abnormity or the low-pressure abnormity is detected, controlling the compressor to reduce the frequency, adjusting the opening degree of the throttling device from the initial opening degree to a first opening degree, and further judging whether the high-pressure abnormity or the low-pressure abnormity still exists;

and 308, if the high-pressure abnormity or the low-pressure abnormity still exists, further increasing the opening degree on the basis of the first opening degree, and further judging whether the high-pressure abnormity or the low-pressure abnormity still exists.

In the above embodiment, optionally, the first heat exchanger is an indoor heat exchanger, the second heat exchanger is an outdoor heat exchanger, the obtaining of the coil temperature of the heat exchanger is performed to determine whether the air conditioner works abnormally according to the coil temperature, and specifically includes: the air conditioner is in a heating mode, the temperature of a coil of the second heat exchanger is obtained, if the temperature of the coil of the second heat exchanger is smaller than or equal to the freezing point temperature, it is judged that the second heat exchanger has a frosting risk, and the second heat exchanger is determined to work abnormally.

In this embodiment, in the heating mode of the air conditioner, if it is detected that the outdoor heat exchanger has a risk of frosting, it may also be determined that the air conditioner system is abnormal in operation, and at this time, the opening degree of the throttling device is adjusted to relieve the frosting phenomenon, and the air conditioner is restored to a normal state by combining the defrosting operation, so that the defrosting function at low cost is realized.

In the above embodiment, optionally, if the air conditioner is still abnormal in operation, the controlling the throttling device to adjust between the first opening degree and the second opening degree continuously to increase the refrigerant flow according to a second rate until the heat exchanger is detected to be normal further includes: and after the refrigerant flow is increased according to the second rate, controlling to start defrosting operation until the heat exchanger is detected to be recovered to be normal.

In this embodiment, if the existence of the risk of defrosting is detected, the opening of the throttling device is controlled to be increased, and meanwhile, the defrosting operation is controlled to be started, so that the control process that the defrosting operation is simple and reliable is realized.

As shown in fig. 4, an operation control method in the present application will be described by taking frosting of a heat exchanger as an example, and includes:

step 402, starting up to run a heating mode;

if not, detecting 404 the temperature of the coil pipe of the outdoor heat exchanger to judge whether the outdoor heat exchanger frosts;

step 406, if frosting is detected, rapidly adjusting the opening degree of the throttling device from the initial opening degree to a first opening degree, and further collecting the temperature of a coil pipe of the outdoor heat exchanger to detect whether frosting is relieved;

and step 408, if no release of frosting is detected, gradually increasing the opening degree on the basis of the first opening degree, and entering a defrosting mode.

In the foregoing embodiment, optionally, the air conditioner further includes a four-way valve for adjusting a flow direction of a refrigerant, and if it is determined that the air conditioner is abnormal in operation, the method includes the step of controlling to increase an opening degree of the throttling device so as to increase a refrigerant flow rate according to a first rate, and specifically includes: if the second heat exchanger is determined to have the frosting risk, acquiring outdoor humidity, outdoor temperature, indoor temperature and air conditioner operation time; determining a frosting metric value according to the outdoor humidity, the outdoor temperature, the indoor temperature and the operation duration; judging the relation between the frosting metric value and the frosting threshold value; and if the frosting metric value is larger than the frosting threshold value, controlling the four-way valve to adjust the flow direction of the refrigerant, and controlling to increase the opening degree of the throttling device so as to increase the flow rate of the refrigerant according to the first speed to execute reversing defrosting operation.

In this embodiment, by further obtaining the outdoor humidity, the outdoor temperature and the indoor temperature, a frosting metric value is determined based on the outdoor humidity, the outdoor temperature and the indoor temperature, the frosting metric value is used for measuring the frosting degree, and a specific defrosting mode is determined by combining a preset frosting threshold value so as to obtain a good defrosting effect.

In the above embodiment, optionally, the method further includes: and if the frosting metric value is smaller than or equal to the frosting threshold value, maintaining the current refrigerant flow direction, and controlling the opening degree of the throttling device to be increased to be larger than or equal to the first opening degree and smaller than or equal to the second opening degree so as to execute the defrosting operation.

In this embodiment, if the frosting metric value is less than or equal to the frosting threshold value, indicating that the current frosting degree is relatively low, the operation in the heating mode may be continued, so as to ensure that the indoor heating operation is not interrupted, and further, the opening degree of the throttling device is first adjusted to the first opening degree, so as to further control the increase of the opening degree on the basis of the first opening degree, so as to complete the defrosting requirement.

As shown in fig. 5, another operation control method in the present application will be described by taking frosting of a heat exchanger as an example, and includes:

step 502, starting up to run a heating mode;

step 504, detecting the temperature of a coil of the outdoor heat exchanger to judge whether the outdoor heat exchanger frosts;

step 506, if frosting is detected, further judging the frosting degree by combining the outdoor temperature, the outdoor humidity, the indoor temperature and the operation time, and selecting a frosting mode according to the frosting degree;

and step 508, if the reversing defrosting is started, adjusting the opening degree of the throttling device to be less than or equal to a first opening degree, and if the reversing defrosting is not started, adjusting the opening degree of the throttling device to be more than the first opening degree.

In the above embodiment, optionally, the throttle device includes a valve seat and a valve needle controlled by excitation to reciprocate, the valve seat is provided with an orifice cooperating with the valve needle to define a refrigerant flow area, the valve needle and the orifice define the refrigerant flow area, wherein the opening degree of the throttle device is controlled to increase to a first opening degree, the flow area increases according to a third rate, the flow area increases according to a fourth rate from the first opening degree, and a ratio between the refrigerant flow corresponding to the second opening degree and the refrigerant flow corresponding to the first opening degree is the same as a ratio between the refrigerant flow corresponding to the second opening degree and the refrigerant flow corresponding to the first opening degree.

In this embodiment, in order to realize that the refrigerant flow rate increases at the first rate when the throttle device is adjusted between the first opening degree and the first opening degree, and the refrigerant flow rate increases at the second rate when the throttle device is adjusted at or above the first opening degree, the flow area of the refrigerant defined between the throttle hole and the needle is limited, that is, the flow area increases at the third rate when the throttle device is adjusted between the first opening degree and the first opening degree, and the flow area increases at the fourth rate when the throttle device is continuously adjusted based on the first opening degree, and the fourth rate/the third rate is equal to the second rate/the first rate, and the refrigerant flow rate is adjusted at different rates by adjusting the flow area.

As shown in fig. 6, if the first opening degree corresponds to the flow area of S1 and the second opening degree corresponds to the flow area of S1+ S2, (S1+ S2)/S1 is k.

In the above embodiment, optionally, the free end portion of the valve needle includes any one of a cone structure, a circular truncated cone structure and a convex arc surface structure; the structure of with free end connection is the round platform structure, the round platform structure is one or more, the generating line of round platform structure is constructed for sharp and/or pitch arc, the tapering of free end is greater than the tapering of round platform structure, wherein, if throttling arrangement's aperture increases to first aperture, then free end with the round platform structure is connected the face with the orifice is injectd flow area.

In this embodiment, the needle that can realize above-mentioned speed regulation has multiple structural style, through the injecing to the needle structure, realizes the regulation to flow area when adjusting the aperture to satisfy the refrigerant flow and adjust through different regulation rate when throttling arrangement is in different regulation intervals, and then can solve the unusual problem of air conditioner operation high-efficiently.

As shown in fig. 7 to 9, the throttle device is embodied as a throttle valve, and includes the following structure: spring 702, stator coil 704, rotor magnet 706, needle rotation sleeve 708, positioning ring 710, inlet and outlet copper tube 712, needle 714, valve body 716, and orifice 718. in order to accommodate different adjustment speeds, the needle may be implemented in a variety of ways.

As shown in fig. 7, the cone structure 722 and the circular truncated cone structure 720 are included, wherein the generatrix of the circular truncated cone is a straight line.

As shown in fig. 8, the circular truncated cone comprises a convex arc surface structure 726 and a circular truncated cone structure 724, wherein a generatrix of the circular truncated cone is a straight line.

As shown in fig. 9, it includes a cone structure 730 and a circular truncated cone structure 728, wherein the generatrix of the circular truncated cone is an arc.

As shown in fig. 10, in the foregoing embodiment, optionally, if the air conditioner is still abnormally operated, the continuously controlling the throttle device to adjust between the first opening degree and the second opening degree specifically includes: if the refrigerant flows in along the direction of the valve needle and flows out along the direction vertical to the valve needle, namely flows from the end A to the end B, the excitation speed of the throttling device regulated between the first opening degree and the second opening degree is continuously controlled to be less than or equal to 90 pps; and if the refrigerant flows in the direction vertical to the valve needle, namely flows from the end B to the end A and flows out in the direction of the valve needle, continuously controlling the excitation speed of the throttling device regulated between the first opening degree and the second opening degree to be greater than or equal to 30 pps.

In the embodiment, when the refrigerant is in different flow directions, the control requirement of the throttling device is met by controlling the excitation speed to be within a limited range.

As shown in fig. 11, an operation control device 110 according to an embodiment of the present invention includes: a memory 1104 and a processor 1102; a memory 1104 for storing program code; a processor 1102 for invoking program code to perform: acquiring working parameters of a heat exchanger, and judging whether the air conditioner works abnormally according to the working parameters; if the air conditioner is judged to be abnormal, controlling to increase the opening degree of the throttling device so as to increase the refrigerant flow according to a first speed; the opening degree of the throttling device is increased to a first opening degree, and whether the air conditioner still works abnormally is judged; and if the air conditioner still works abnormally, continuing to control the throttling device to adjust between the first opening and the second opening so as to enable the refrigerant flow to increase according to a second rate until the heat exchanger is detected to be recovered to be normal, wherein the second rate is greater than the first rate, and the ratio of the refrigerant flow corresponding to the second opening to the refrigerant flow corresponding to the first opening is greater than or equal to 3.34 and less than or equal to 100.

In addition, the throttling device may be a throttling valve.

In the foregoing embodiment, optionally, the air conditioner is further provided with a compressor respectively connected to the first heat exchanger and the second heat exchanger, and the processor 1102 is specifically configured to: controlling the compressor to perform a down-conversion operation.

In the foregoing embodiment, optionally, the processor 1102 is specifically configured to: and continuously controlling the throttling device to adjust between the first opening degree and the second opening degree according to a preset amplification range, wherein the preset amplification range is greater than or equal to 50 steps and less than or equal to 350 steps.

In the foregoing embodiment, optionally, the processor 1102 is specifically configured to: and increasing the refrigerant flow to be less than or equal to a target flow according to the second speed, wherein the refrigerant flow is less than or equal to 8L/min under the initial opening degree, the target flow is the refrigerant flow corresponding to the second opening degree, and the target flow is determined according to the rated heat exchange quantity of the air conditioner.

In the foregoing technical solution, optionally, the processor 1102 is specifically configured to: acquiring the temperature of a coil of the heat exchanger to judge whether the air conditioner works abnormally according to the temperature of the coil; and/or acquiring the working pressure of the heat exchanger to judge whether the air conditioner works abnormally according to the working pressure.

In the foregoing embodiment, optionally, the processor 1102 is specifically configured to: respectively acquiring a first coil temperature of the first heat exchanger and a second coil temperature of the second heat exchanger; if the first heat exchanger is determined to be in the pressure abnormal state according to the temperature of the first coil, determining that the first heat exchanger works abnormally; and if the second heat exchanger is determined to be in the abnormal pressure state according to the temperature of the second coil, determining that the second heat exchanger works abnormally.

In the foregoing embodiment, optionally, the first heat exchanger is an indoor heat exchanger, the second heat exchanger is an outdoor heat exchanger, and the processor 1102 is specifically configured to: the air conditioner is in a heating mode, the temperature of a coil of the second heat exchanger is obtained, if the temperature of the coil of the second heat exchanger is smaller than or equal to the freezing point temperature, it is judged that the second heat exchanger has a frosting risk, and the second heat exchanger is determined to work abnormally.

In the foregoing embodiment, optionally, the processor 1102 is specifically configured to: and after the refrigerant flow is increased according to the second rate, controlling to start defrosting operation until the heat exchanger is detected to be recovered to be normal.

In the above embodiment, optionally, the air conditioner further includes a four-way valve for adjusting a flow direction of a refrigerant, and the processor 1102 is specifically configured to: if the second heat exchanger is determined to have the frosting risk, acquiring outdoor humidity, outdoor temperature, indoor temperature and air conditioner operation time; determining a frosting metric value according to the outdoor humidity, the outdoor temperature, the indoor temperature and the operation duration; judging the relation between the frosting metric value and the frosting threshold value; and if the frosting metric value is larger than the frosting threshold value, controlling the four-way valve to adjust the flow direction of the refrigerant, and controlling to increase the opening degree of the throttling device so as to increase the flow rate of the refrigerant according to the first speed to execute reversing defrosting operation.

In the foregoing embodiment, optionally, the processor 1102 is specifically configured to: and if the frosting metric value is smaller than or equal to the frosting threshold value, maintaining the current refrigerant flow direction, and controlling the opening degree of the throttling device to be increased to be larger than or equal to the first opening degree and smaller than or equal to the second opening degree so as to execute the defrosting operation.

In the foregoing embodiment, optionally, the processor 1102 is specifically configured to: if the refrigerant flows in along the direction of the valve needle and flows out along the direction vertical to the valve needle, continuously controlling the excitation speed of the throttling device regulated between the first opening degree and the second opening degree to be less than or equal to 90 pps; and if the refrigerant flows in the direction vertical to the valve needle and flows out in the direction of the valve needle, continuously controlling the excitation speed of the throttling device regulated between the first opening degree and the second opening degree to be greater than or equal to 30 pps.

An air conditioner according to an embodiment of the present invention includes: the above embodiment provides the operation control device 110.

As shown in fig. 12, the air conditioner further includes a compressor 1202, a four-way valve 1204, an outdoor fan 1206, an outdoor heat exchanger 1208, an indoor heat exchanger 1210, an indoor fan 1212, and a throttling device 1214, wherein the throttling device may be any one of the structures shown in fig. 7 to 9, but is not limited to the above structure.

As shown in fig. 13, the air conditioner may further include an auxiliary heating device 1216 in an indoor unit of the air conditioner to turn on auxiliary heating for room heating when a defrosting operation is performed, in addition to the compressor 1202, the four-way valve 1204, the outdoor fan 1206, the outdoor heat exchanger 1208, the indoor heat exchanger 1210, the indoor fan 1212, and the throttling device 1214.

A computer-readable storage medium according to an embodiment of the present invention, has a computer program stored thereon, which, when executed, implements the steps of the operation control method described in any one of the above.

In summary, the present invention provides an operation control method, an operation control device, an air conditioner and a computer readable storage medium, wherein the opening degree of the throttling device is specifically limited, that is, the opening degree is adjusted from an initial opening degree, and the adjustment of the opening degree of the throttling device comprises at least two stages, wherein the stage from the initial opening degree to a first opening degree is a first stage, the stage from the first opening degree to a second opening degree is a second stage, the refrigerant flow rate in the first stage increases at a first rate, the refrigerant flow rate in the second stage increases at a second rate, the second rate is greater than the first rate, and the ratio between the refrigerant flow rate corresponding to the second opening degree and the refrigerant flow rate corresponding to the first opening degree is between [3.34 and 100], on one hand, when the current abnormal problem cannot be solved or alleviated after the refrigerant flow rate is increased at the first rate, the abnormal problem can be solved or alleviated by further adjusting the opening degree of the throttling device at the second rate, on the other hand, compared with the related art solution, there is no need to separately provide a bypass for performing the unloading operation, and thus the manufacturing cost is not increased, and on the other hand, compared with the related art solution, there is no need to perform the shutdown operation, and thus the normal use of the user is not affected.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention as defined in the appended claims and their equivalents, and it is intended that the invention encompass such changes and modifications as well.

Claims

1. An operation control method is suitable for an air conditioner, the air conditioner comprises a first heat exchanger and a second heat exchanger, a throttling device is arranged on a flow path for communicating the first heat exchanger with the second heat exchanger, and the operation control method is characterized by comprising the following steps:

acquiring working parameters of a heat exchanger, and judging whether the air conditioner works abnormally according to the working parameters;

if the air conditioner is judged to be abnormal, controlling to increase the opening degree of the throttling device so as to increase the refrigerant flow according to a first speed;

the opening degree of the throttling device is increased to a first opening degree, and whether the air conditioner still works abnormally is judged;

if the air conditioner still works abnormally, the throttling device is continuously controlled to be adjusted between the first opening degree and the second opening degree, so that the refrigerant flow is increased according to a second rate until the heat exchanger is detected to be recovered to be normal, and the second rate is greater than the first rate;

the ratio of the refrigerant flow corresponding to the second opening degree to the refrigerant flow corresponding to the first opening degree is greater than or equal to 3.34 and less than or equal to 100.

2. The operation control method according to claim 1,

the ratio of the refrigerant flow corresponding to the second opening degree to the refrigerant flow corresponding to the first opening degree is greater than or equal to 3.35 and less than or equal to 30.

3. The operation control method according to claim 1, wherein the air conditioner is further provided with a compressor connected to the first heat exchanger and the second heat exchanger, respectively, and if it is determined that the air conditioner is abnormal in operation, the operation control method further comprises:

controlling the compressor to perform a down-conversion operation.

4. The operation control method according to claim 2, wherein before obtaining the operating parameter of the heat exchanger and determining whether the air conditioner is abnormal according to the operating parameter, the method further comprises:

acquiring the opening degree of the throttling device, determining the opening degree as an initial opening degree, wherein the initial opening degree is smaller than the first opening degree, the first opening degree is larger than or equal to 150 steps and smaller than or equal to 400 steps, so that the flow rate of the refrigerant is increased between the initial opening degree and the first opening degree according to the first speed,

and under the initial opening degree, the refrigerant flow is less than or equal to 8L/min.

5. The operation control method according to claim 4, wherein if the air conditioner is still abnormally operated, the step of continuously controlling the throttle device to adjust between the first opening degree and the second opening degree includes:

and continuously controlling the throttling device to adjust between the first opening degree and the second opening degree according to a preset amplification range, wherein the preset amplification range is greater than or equal to 50 steps and less than or equal to 350 steps.

6. The operation control method according to claim 5, wherein if the air conditioner is still abnormally operated, the step of continuously controlling the throttling device to adjust between the first opening degree and the second opening degree so as to increase the refrigerant flow rate according to a second rate includes:

the refrigerant flow rate is increased to be less than or equal to a target flow rate according to the second rate,

and the target flow is the refrigerant flow corresponding to the second opening degree, and is determined according to the rated heat exchange quantity of the air conditioner.

7. The operation control method according to any one of claims 1 to 6, wherein the obtaining of the operating parameter of the heat exchanger and the determining of whether the air conditioner is operating abnormally according to the operating parameter specifically include:

acquiring the temperature of a coil of the heat exchanger to judge whether the air conditioner works abnormally according to the temperature of the coil; and/or

And acquiring the working pressure of the heat exchanger so as to judge whether the air conditioner works abnormally according to the working pressure.

8. The operation control method according to claim 7, wherein the obtaining of the coil temperature of the heat exchanger to determine whether the air conditioner is abnormal according to the coil temperature specifically comprises:

respectively acquiring a first coil temperature of the first heat exchanger and a second coil temperature of the second heat exchanger;

if the first heat exchanger is determined to be in the pressure abnormal state according to the temperature of the first coil, determining that the first heat exchanger works abnormally;

and if the second heat exchanger is determined to be in the abnormal pressure state according to the temperature of the second coil, determining that the second heat exchanger works abnormally.

9. The operation control method according to claim 7, wherein the first heat exchanger is an indoor heat exchanger, the second heat exchanger is an outdoor heat exchanger, the obtaining of the operating parameter of the heat exchanger and the determining of whether the air conditioner is operating abnormally according to the operating parameter specifically include:

the air conditioner is in a heating mode, the temperature of a coil of the second heat exchanger is obtained, if the temperature of the coil of the second heat exchanger is smaller than or equal to the freezing point temperature, it is judged that the second heat exchanger has a frosting risk, and the second heat exchanger is determined to work abnormally.

10. The operation control method according to claim 9, wherein if the air conditioner is still abnormally operated, the throttling device is continuously controlled to be adjusted between the first opening degree and the second opening degree so that the refrigerant flow rate is increased according to a second rate until the heat exchanger is detected to be restored to the normal state, specifically, the method further comprises:

and after the refrigerant flow is increased according to the second rate, controlling to start defrosting operation until the heat exchanger is detected to be recovered to be normal.

11. The operation control method according to claim 9, wherein the air conditioner further includes a four-way valve for adjusting a flow direction of the refrigerant, and the controlling of increasing the opening degree of the throttle device to increase the flow rate of the refrigerant at a first rate when it is determined that the air conditioner is abnormally operated includes:

if the second heat exchanger is determined to have the frosting risk, acquiring outdoor humidity, outdoor temperature, indoor temperature and air conditioner operation time;

determining a frosting metric value according to the outdoor humidity, the outdoor temperature, the indoor temperature and the operation duration;

judging the relation between the frosting metric value and the frosting threshold value;

and if the frosting metric value is larger than the frosting threshold value, controlling the four-way valve to adjust the flow direction of the refrigerant, and controlling to increase the opening degree of the throttling device so as to increase the flow rate of the refrigerant according to the first speed to execute reversing defrosting operation.

12. The operation control method according to claim 11, characterized by further comprising:

and if the frosting metric value is smaller than or equal to the frosting threshold value, maintaining the current refrigerant flow direction, and controlling the opening degree of the throttling device to be increased to be larger than or equal to the first opening degree and smaller than or equal to the second opening degree so as to execute the defrosting operation.

13. The operation control method according to any one of claims 1 to 6, wherein the throttle device includes a valve seat and a needle that reciprocates by excitation control, an orifice hole that engages with the needle is opened in the valve seat to define a refrigerant flow area by the needle and the orifice hole,

the opening degree of the throttling device is controlled to be increased to a first opening degree, the flow area is increased according to a third rate, the flow area is increased according to a fourth rate from the first opening degree, and the ratio of the flow area corresponding to the second opening degree to the flow area corresponding to the first opening degree is the same as the ratio of the refrigerant flow corresponding to the second opening degree to the refrigerant flow corresponding to the first opening degree.

14. The operation control method according to claim 13,

the free end part of the valve needle comprises any one of a cone structure, a circular truncated cone structure and a convex cambered surface structure;

the structure connected with the free end part is a circular truncated cone structure, the number of the circular truncated cone structures is one or more, the generatrix of the circular truncated cone structure is constructed into a straight line and/or an arc line, the taper of the free end part is greater than that of the circular truncated cone structure,

and if the opening degree of the throttling device is increased to the first opening degree, the free end part, the circular truncated cone structure connecting surface and the throttling hole limit the flow area.

15. The operation control method according to claim 14, wherein if the air conditioner is still abnormally operated, the step of continuously controlling the throttle device to adjust between the first opening degree and the second opening degree includes:

if the refrigerant flows in along the direction of the valve needle and flows out along the direction vertical to the valve needle, continuously controlling the excitation speed of the throttling device regulated between the first opening degree and the second opening degree to be less than or equal to 90 pps;

and if the refrigerant flows in the direction vertical to the valve needle and flows out in the direction of the valve needle, continuously controlling the excitation speed of the throttling device regulated between the first opening degree and the second opening degree to be greater than or equal to 30 pps.

16. An operation control device adapted for an air conditioner, comprising: a processor capable of implementing the steps defined by the operation control method of any one of claims 1 to 15 when executing the computer program.

17. An air conditioner, comprising:

the operation control device according to claim 16.

18. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed, implements the steps of the operation control method according to any one of claims 1 to 15.