WO2023207222A1 - Air conditioner and control method therefor - Google Patents

Abstract

The present invention belongs to the technical field of air conditioners. Specifically provided are an air conditioner and a control method therefor. The present invention aims to solve the problem of a relatively low heat exchange efficiency of an existing air conditioner in some working conditions due to a fixed operation mode of an evaporator of the existing air conditioner. To this end, the air conditioner in the present invention comprises a refrigerant circulation loop, and a variable-frequency compressor, a condenser, a throttling component and an evaporator, which are arranged in the refrigerant circulation loop, wherein the evaporator comprises a plurality of evaporation sections, which are arranged in parallel, indoor fans are correspondingly arranged in the vicinity of the evaporation sections, and the plurality of evaporation sections are configured to be capable of selectively being connected to the refrigerant circulation loop respectively. The control method in the present invention comprises: when an air conditioner operates in a refrigeration working condition, acquiring an outdoor environment temperature; and according to the outdoor environment temperature, controlling the conditions in which a plurality of evaporation sections are connected to a refrigerant circulation loop. By means of the present invention, a heat exchange capacity of the evaporator can better match the actual heat exchange requirements, thereby effectively improving the evaporation efficiency of the evaporator, and thus effectively improving the heat exchange efficiency of the whole air conditioner.

Description

Air conditioner and control method thereof

This application claims priority to Chinese patent application CN202210460053.6, which was submitted on April 24, 2022 and has an invention title of "Air conditioner and control method thereof". The entire content of the above-mentioned Chinese patent application is incorporated into this application by reference.

Technical field

The invention belongs to the technical field of air conditioning, and specifically provides an air conditioner and a control method thereof.

Background technique

In order to maintain a comfortable ambient temperature, air conditioners have become an indispensable heat exchange device in people's lives. At the same time, with the continuous development of air conditioning technology, users have also put forward higher and higher requirements for the comprehensive performance of air conditioners. Especially for the heat exchange efficiency of air conditioners, this is an aspect that most users are concerned about. Specifically, air conditioners require a refrigerant circulation loop to achieve heat exchange, and the compressor, throttling member, evaporator and condenser, as the four major components set on the refrigerant circulation loop, have a critical impact on the normal operation of the air conditioner and its Heat exchange efficiency plays a vital role; among them, the heat exchange efficiency of the evaporator determines the heat exchange efficiency of the entire air conditioner to a large extent. However, the operation of the existing evaporator is almost fixed. Based on the integral structure of the existing evaporator, regardless of the circulation demand and circulation speed of the refrigerant, the refrigerant needs to flow through the entire evaporator for heat exchange. When the indoor temperature is not much different from the target temperature or the user's heat exchange demand is small, the flow rate of the refrigerant is usually low. In this case, after the refrigerant flows through the entire evaporator, the pressure loss is large, resulting in the failure of the evaporator. Insufficient utilization leads to the problem of energy waste.

Accordingly, this field needs a new air conditioner and its control method to solve the above problems.

Contents of the invention

The present invention aims to solve the above technical problem, that is, to solve the problem that the operating mode of the evaporator of the existing air conditioner is fixed, resulting in low heat exchange efficiency under some operating conditions.

In a first aspect, the present invention provides a control method for an air conditioner. The air conditioner includes a refrigerant circulation loop and a variable frequency compressor, a condenser, a throttling member and an evaporator arranged on the refrigerant circulation loop. The evaporator includes a plurality of evaporation sections arranged in parallel, an indoor fan is provided near the evaporation section, and the plurality of evaporation sections are arranged to be selectively connected to the refrigerant circulation loop, and the control Methods include:

When the air conditioner is operating in cooling mode, obtain the outdoor ambient temperature;

According to the outdoor ambient temperature, the access of multiple evaporation sections to the refrigerant circulation loop is controlled.

In the preferred technical solution of the control method of the above-mentioned air conditioner, the step of "controlling the access of multiple evaporation sections to the refrigerant circulation loop according to the outdoor ambient temperature" specifically includes:

If the outdoor ambient temperature is greater than or equal to the first preset outdoor ambient temperature, further obtain the indoor ambient temperature;

According to the indoor ambient temperature, the access of multiple evaporation sections to the refrigerant circulation loop is controlled.

In the preferred technical solution of the above control method of the air conditioner, the step of "controlling the access of multiple evaporation sections to the refrigerant circulation loop according to the indoor ambient temperature" specifically includes:

If the indoor ambient temperature is greater than the first preset indoor ambient temperature, control all of the plurality of evaporation sections to be connected to the refrigerant circulation loop;

If the indoor ambient temperature is less than or equal to the first preset indoor ambient temperature and greater than or equal to the second preset indoor ambient temperature, control the first preset evaporation section to be connected to the refrigerant circulation loop;

If the indoor ambient temperature is less than the second preset indoor ambient temperature, control the second preset evaporation section to be connected to the refrigerant circulation loop;

Wherein, the first preset number is more than the second preset number.

In a preferred technical solution of the above control method of the air conditioner, when the air conditioner is operating in cooling mode and the outdoor ambient temperature is greater than or equal to the first preset outdoor ambient temperature, the control method further includes:

According to the indoor ambient temperature, the operating frequency of the variable frequency compressor and/or the rotation speed of a plurality of indoor fans are controlled.

In the preferred technical solution of the control method of the above-mentioned air conditioner, the step of "controlling the access of multiple evaporation sections to the refrigerant circulation loop according to the outdoor ambient temperature" specifically includes:

If the outdoor ambient temperature is lower than the first preset outdoor ambient temperature, a part of the plurality of evaporation sections is controlled to be connected to the refrigerant circulation loop.

In a preferred technical solution of the above control method of the air conditioner, when the air conditioner is operating in cooling mode and the outdoor ambient temperature is less than the first preset outdoor ambient temperature, the control method further includes:

Control the variable frequency compressor to operate at a preset frequency; and/or

The indoor fans corresponding to a part of the plurality of evaporation sections connected to the refrigerant circulation loop are controlled to run at a preset speed.

In the preferred technical solution of the above control method of the air conditioner, the control method further includes:

When the air conditioner is operating in the heating mode, all the plurality of evaporation sections are controlled to be connected to the refrigerant circulation loop.

In the preferred technical solution of the above control method of the air conditioner, when the air conditioner is operating in the heating mode, the control method further includes:

Get the indoor ambient temperature;

According to the indoor ambient temperature, the operating parameters of the air conditioner are controlled.

In the preferred technical solution of the above air conditioner control method, the step of "controlling the operating parameters of the air conditioner according to the indoor ambient temperature" specifically includes:

According to the indoor ambient temperature, the operating frequency of the variable frequency compressor and/or the rotational speeds of the plurality of indoor fans are controlled.

In a second aspect, the present invention also provides an air conditioner, which includes a controller capable of executing the control method described in any of the above preferred technical solutions.

When the above technical solution is adopted, the air conditioner of the present invention includes a refrigerant circulation circuit and a variable frequency compressor, a condenser, a throttling member and an evaporator arranged on the refrigerant circulation circuit. The evaporator includes a plurality of parallel An evaporation section is provided, an indoor fan is provided near the evaporation section, and a plurality of the evaporation sections are arranged to be selectively connected to the refrigerant circulation loop respectively. The control method of the present invention includes: When the air conditioner is operating in a cooling mode, the outdoor ambient temperature is obtained; and based on the outdoor ambient temperature, the access of multiple evaporation sections to the refrigerant circulation loop is controlled. First, the present invention divides the heat exchange coil of the evaporator into a plurality of evaporation sections arranged in parallel, so that the plurality of evaporation sections can be selectively connected to the air conditioner according to the heat exchange requirements of the air conditioner. In the refrigerant circulation loop; further, the present invention can also control the access of multiple evaporation sections to the refrigerant circulation loop according to the outdoor ambient temperature when the air conditioner is running in refrigeration mode, so that the evaporator The heat exchange capacity can better match the actual heat exchange demand, thereby effectively improving the evaporation efficiency of the evaporator, thereby effectively improving the heat exchange efficiency of the entire air conditioner.

Description of the drawings

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings, in which:

Figure 1 is a schematic diagram of the overall structure of the evaporator of the present invention;

Figure 2 is a flow chart of the main steps of the control method of the present invention;

Figure 3 is a specific step flow chart of the first preferred embodiment of the present invention;

Figure 4 is a specific step flow chart of the second preferred embodiment of the present invention;

Reference signs: 11. First evaporation section; 12. Second evaporation section; 13. Third evaporation section; 14. First indoor fan; 15. Second indoor fan; 16. Third indoor fan; 17. First Stop valve; 18. Second stop valve; 19. Third stop valve.

Detailed ways

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application situations. For example, the air conditioner of the present invention can be a household air conditioner or a commercial air conditioner; such changes in specific application locations do not deviate from the basic principles of the present invention and belong to the protection scope of the present invention.

It should be noted that in the description of this preferred embodiment, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the direction or positional relationship based on the terms attached. The directions or positional relationships shown in the figures are only for convenience of description and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, in the description of the present invention, unless otherwise clearly stated and limited, the term "connected" should be understood in a broad sense. For example, it can be an electrical connection or a mechanical connection; it can be a direct connection or through an intermediate medium. An indirect connection can also be an internal connection between two components.

In addition, in the description of this preferred embodiment, the terms "first", "second", "third", "fourth", "fifth", "sixth" and "seventh" are only used for description. purpose and should not be construed as indicating or implying relative importance. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Although the various steps of the control method of the present invention are described in a specific order in this application, these orders are not limiting, and those skilled in the art can perform them in different orders without departing from the basic principles of the present invention. described steps.

Specifically, the air conditioner of the present invention includes an indoor unit and an outdoor unit. A refrigerant circulation loop is provided between the indoor unit and the outdoor unit. The refrigerant circulation loop circulates refrigerant for heat exchange between indoors and outdoors. , the refrigerant circulation loop is provided with an evaporator, a variable frequency compressor, a four-way valve, a condenser and an electronic expansion valve; wherein the evaporator is provided in the indoor unit, and the condenser is provided in the outdoor unit. In the machine, the refrigerant circulates continuously between the evaporator and the condenser through the refrigerant circulation loop to achieve heat exchange. When the four-way valve is reversed, the reverse circulation of the refrigerant in the refrigerant circulation loop can be controlled. , so that the air conditioner can switch between cooling and heating conditions. It should be noted that the present invention does not place any restrictions on the specific structure of the air conditioner, and those skilled in the art can set it themselves according to actual needs.

Next, refer to Figure 1, which is a schematic diagram of the overall structure of the evaporator of the present invention. As shown in Figure 1, further, the evaporator of the present invention includes three evaporation sections arranged in parallel, which are a first evaporation section 11, a second evaporation section 12 and a third evaporation section 13 arranged in sequence from top to bottom. Moreover, a first indoor fan 14, a second indoor fan 15, and a third indoor fan 16 are respectively provided near the first evaporation section 11, the second evaporation section 12, and the third evaporation section 13 to effectively assist these three evaporations. section for heat exchange. It should be noted that although the evaporator described in this preferred embodiment is only provided with three evaporation sections, this is only a preferred arrangement in order to take into account both manufacturing cost and heat exchange efficiency, and is not limiting. Those skilled in the art can set the specific number of evaporation sections according to actual usage requirements; for example, it can also be two or more. Such changes in the specific number of evaporation sections do not deviate from the basic principles of the present invention and belong to the protection scope of the present invention.

In addition, the two ends of these three evaporation sections are connected to the main liquid pipe and the main gas pipe respectively, and the first end of the first evaporation section 11 close to the main liquid pipe is also provided with a first stop valve 17, and the second evaporation section 11 is also provided with a first stop valve 17. A second stop valve 18 is also provided at one end of section 12 close to the main liquid pipe. A third stop valve 19 is also provided at one end of the third evaporation section 13 close to the main liquid pipe. The stop valve can control the corresponding The on-off state of the pipeline, thereby controlling the access of the corresponding evaporation section to the refrigerant circulation loop, that is, through the setting of three stop valves, the first evaporation section 11, the second evaporation section 12 and the third evaporation section 13 It can be selectively connected to the refrigerant circulation loop. Of course, this setting method is not restrictive. Those skilled in the art can also set and control the first evaporation section 11, the second evaporation section 12 and the third evaporation section 13 to selectively access the refrigerant according to actual needs. The specific method in the circulation loop, for example, by using a three-way valve, etc., is not limiting, as long as the first evaporation section 11, the second evaporation section 12 and the third evaporation section 13 can respectively selectively access the In the refrigerant circulation loop.

In addition, the air conditioner of the present invention also includes an outdoor environment temperature sensor, an indoor environment temperature sensor and a controller. The outdoor environment temperature sensor can detect the outdoor environment temperature, the indoor environment temperature sensor can detect the indoor environment temperature, and the controller The detection data of the outdoor environment temperature sensor and the indoor environment temperature sensor can be obtained, and the controller can also control the operating status of the air conditioner, for example, control the connection status of the four-way valve, control the stop valve The opening and closing state, controlling the frequency of the variable frequency compressor, controlling the rotation speed of the indoor fan, etc. Those skilled in the art can understand that the present invention does not place any restrictions on the specific structure and specific model of the controller, and the controller can be the original controller of the air conditioner, or it can be a controller for executing the present invention. The control method of the invention provides a separate controller, and those skilled in the art can set the structure and model of the controller according to actual needs.

Next, refer to Figure 2, which is a flow chart of the main steps of the control method of the present invention. As shown in Figure 2, the control method of the present invention mainly includes the following steps:

S1: Obtain the outdoor ambient temperature when the air conditioner is running in cooling mode;

S2: Control the connection of multiple evaporation sections to the refrigerant circulation loop according to the outdoor ambient temperature.

Further, in step S1, when the air conditioner is operating in cooling mode, the controller can obtain the outdoor ambient temperature through the outdoor ambient temperature sensor. Of course, the present invention does not make any specific acquisition method of the outdoor ambient temperature. Limitations can be set by those skilled in the art according to actual usage requirements. Next, in step S2, the controller can correspondingly control the access of multiple evaporation sections to the refrigerant circulation loop according to the obtained outdoor ambient temperature. It should be noted that the present invention does not place any restrictions on the specific control method. Those skilled in the art can set it by themselves according to actual use needs, as long as multiple evaporation sections are controlled to be connected to the refrigerant circulation loop according to the outdoor ambient temperature. The situation falls within the protection scope of the present invention.

Next, refer to Figure 3, which is a specific step flow chart of the first preferred embodiment of the present invention. As shown in Figure 3, based on the air conditioner described in the above preferred embodiment, the first preferred embodiment of the control method of the present invention specifically includes the following steps:

S101: Obtain the outdoor ambient temperature when the air conditioner is running in cooling mode;

S102: Determine whether the outdoor ambient temperature is greater than or equal to the first preset outdoor ambient temperature; if yes, execute step S105; if not, execute step S103;

S103: Control the first evaporation section and the second evaporation section to be connected to the refrigerant circulation loop;

S104: Control the variable frequency compressor to run at the first preset frequency, and control the first indoor fan and the second indoor fan to run at the first preset speed;

S105: Further obtain the indoor ambient temperature;

S106: If the indoor ambient temperature is greater than the first preset indoor ambient temperature, control all three evaporation sections to be connected to the refrigerant circulation loop;

S107: If the indoor ambient temperature is less than or equal to the first preset indoor ambient temperature and greater than or equal to the second preset indoor ambient temperature, control the first evaporation section and the second evaporation section to be connected to the refrigerant circulation loop;

S108: If the indoor ambient temperature is lower than the second preset indoor ambient temperature, control the first evaporation section to be connected to the refrigerant circulation loop;

S109: Control the variable frequency compressor to run at the second preset frequency, and control all indoor fans to run at the second preset speed;

S110: Control the variable frequency compressor to run at the third preset frequency, and control the first indoor fan and the second indoor fan to run at the third preset speed;

S111: Control the variable frequency compressor to run at the fourth preset frequency, and control the first indoor fan to run at the fourth preset speed.

Further, in step S101, when the air conditioner is operating in cooling mode, the controller can obtain the outdoor ambient temperature through the outdoor ambient temperature sensor. Of course, the present invention does not make any specific acquisition method of the outdoor ambient temperature. Limitations, those skilled in the art can set them according to actual usage requirements, so as to correspondingly control the access of multiple evaporation sections to the refrigerant circulation loop according to the obtained outdoor ambient temperature. It should be noted that the present invention does not place any restrictions on the specific control method. Those skilled in the art can set it by themselves according to actual use needs, as long as multiple evaporation sections are controlled to be connected to the refrigerant circulation loop according to the outdoor ambient temperature. The situation falls within the protection scope of the present invention.

Further, based on the determination in step S102, the controller can determine the pressure that the outdoor ambient temperature brings to the heat exchange of the air conditioner, so as to selectively execute different steps and improve the determination efficiency.

Based on the judgment result of step S102, if the outdoor ambient temperature is less than the first preset outdoor ambient temperature, steps S103 and S104 are executed, that is, the first evaporation section 11 and the second evaporation section 12 are controlled to be connected to the In the refrigerant circulation loop, in order to effectively ensure the heat exchange efficiency of the evaporator; and, control the variable frequency compressor to operate at the first preset frequency, and control the first indoor fan 14 and the second indoor fan 15 to operate at the above preset frequency. Run at the first preset speed. It should be noted that the present invention does not place any restrictions on the specific value of the first preset outdoor ambient temperature, and those skilled in the art can set it according to actual usage needs; preferably, the first preset outdoor ambient temperature is 30℃.

Based on the determination result of step S102, if the outdoor ambient temperature is greater than or equal to the first preset outdoor ambient temperature, step S105 is executed, that is, the indoor ambient temperature is further obtained in order to effectively determine the cooling demand of the heat exchange environment, so as to Correspondingly, the connection of the three evaporation sections to the refrigerant circulation loop is controlled.

Further, in step S106, if the indoor ambient temperature is greater than the first preset indoor ambient temperature, it means that the heat exchange environment has a large cooling demand at this time. In this case, three of the evaporation All segments are connected to the refrigerant circulation loop to effectively ensure the refrigeration speed; and step S109 is performed, that is, controlling the variable frequency compressor to operate at the second preset frequency, and controlling all indoor fans to operate at the second preset frequency. It operates at two preset speeds to ensure the cooling rate to the greatest extent.

Further, in step S107, if the indoor ambient temperature is less than or equal to the first preset indoor ambient temperature and greater than or equal to the second preset indoor ambient temperature, it means that the cooling demand of the heat exchange environment is moderate at this time. In this case, the first evaporation section 11 and the second evaporation section 12 are controlled to be connected to the refrigerant circulation loop, and the third evaporation section 13 does not need to be connected, so as to effectively improve the refrigeration efficiency; and, perform step S110, that is, control The variable frequency compressor runs at the third preset frequency, and the first indoor fan 14 and the second indoor fan 15 are controlled to run at the third preset speed. The third indoor fan 16 does not need to run, so as to maximize the Improve cooling efficiency.

Further, in step S108, if the indoor ambient temperature is lower than the second preset indoor ambient temperature, it means that the cooling demand of the heat exchange environment is small at this time. In this case, only the first evaporation stage is controlled. 11 is connected to the refrigerant circulation loop, and the second evaporation section 12 and the third evaporation section 13 do not need to be connected in order to maximize the refrigeration efficiency; and, perform step S111, that is, control the variable frequency compressor to operate as described The fourth preset frequency is run, and the first indoor fan 14 is controlled to run at the fourth preset speed. The second indoor fan 15 and the third indoor fan 16 do not need to run, so as to maximize the cooling efficiency.

It should be noted that the present invention does not place any restrictions on the specific values of the first preset indoor ambient temperature and the second preset indoor ambient temperature. Those skilled in the art can set them by themselves according to actual use needs; preferably , the first preset indoor ambient temperature is set to 30°C, and the second preset indoor ambient temperature is set to 26°C, in order to maximize the accuracy of control.

In addition, it should be noted that the present invention does not place any restrictions on the specific values of the first preset frequency, the second preset frequency, the third preset frequency and the fourth preset frequency. Those skilled in the art can set it by themselves according to actual usage requirements, as long as the second preset frequency is greater than the third preset frequency and is greater than the fourth preset frequency. The first preset frequency Set between the third preset frequency and the fourth preset frequency; as a preferred setting method, under refrigeration conditions, set the reference frequency of the variable frequency compressor to 80Hz, then the The first preset frequency is 0.6 times the base frequency, the second preset frequency is 1 times the base frequency, the third preset frequency is 0.7 times the base frequency, and the fourth preset frequency is 0.4 times the reference frequency in order to maximize the accuracy of control; of course, those skilled in the art can also set the specific value of the reference frequency according to actual needs.

In addition, it should be noted that the present invention does not place any restrictions on the specific values of the first preset rotation speed, the second preset rotation speed, the third preset rotation speed and the fourth preset rotation speed. , those skilled in the art can set it by themselves according to actual usage requirements, as long as the second preset speed is greater than the third preset speed and is greater than the fourth preset speed. The first preset speed The rotation speed is set between the third preset rotation speed and the fourth preset rotation speed; as a preferred setting method, under cooling conditions, the reference rotation speed of the indoor fan is set to 1100r/s, then the The first preset rotation speed is 0.5 times the base rotation speed, the second preset rotation speed is 1 times the base rotation speed, the third preset rotation speed is 0.7 times the base rotation speed, and the fourth preset rotation speed is 0.4 times the reference speed in order to maximize the accuracy of control and ensure the stable improvement of refrigeration efficiency; of course, those skilled in the art can also set the specific value of the reference speed according to actual needs.

Refer to Figure 4 below, which is a specific step flow chart of the second preferred embodiment of the present invention. As shown in Figure 4, based on the air conditioner described in the above preferred embodiment, the second preferred embodiment of the control method of the present invention specifically includes the following steps:

S201: When the air conditioner is running in heating mode, control all evaporation sections to be connected to the refrigerant circulation loop;

S202: Get the indoor ambient temperature;

S203: If the indoor ambient temperature is lower than the third preset indoor ambient temperature, control the variable frequency compressor to run at the fifth preset frequency, and control all indoor fans to run at the fifth preset speed;

S204: If the indoor ambient temperature is greater than or equal to the third preset indoor ambient temperature and less than or equal to the fourth preset indoor ambient temperature, control the variable frequency compressor to run at the sixth preset frequency, and control the first indoor fan and the second indoor fan to The sixth preset speed runs, and the third indoor fan runs at the seventh preset speed;

S205: If the indoor ambient temperature is greater than the fourth preset indoor ambient temperature, control the variable frequency compressor to run at the seventh preset frequency, and control all indoor fans to run at the seventh preset speed.

Further, in step S201, when the air conditioner is operating in the heating mode, the controller controls all evaporation sections to be connected to the refrigerant circulation loop to ensure the condensation capacity of the evaporator to the greatest extent. Next, in step S202, the controller can obtain the indoor ambient temperature through the indoor ambient temperature sensor, so as to control the operating parameters of the air conditioner according to the indoor ambient temperature, thereby effectively ensuring the heating efficiency of the air conditioner. .

As a preferred setting method, the operating parameters of the air conditioner include the operating frequency of the compressor and the rotational speed of the indoor fan. Specifically, in step S203, if the indoor ambient temperature is lower than the third preset indoor ambient temperature, it means that the heat exchange environment has a large heating demand at this time. In this case, the frequency conversion is controlled. The compressor operates at the fifth preset frequency, and all indoor fans are controlled to operate at the fifth preset speed, thereby ensuring the heating rate to the greatest extent.

Further, in step S204, if the indoor ambient temperature is greater than or equal to the third preset indoor ambient temperature and less than or equal to the fourth preset indoor ambient temperature, it means that the heating of the heat exchange environment at this time is The demand is moderate. In this case, the variable frequency compressor is controlled to run at the sixth preset frequency, and the first indoor fan 14 and the second indoor fan 15 are controlled to run at the sixth preset speed, and the second indoor fan 14 is controlled to run at the sixth preset speed. The three-indoor fan 16 operates at the seventh preset rotation speed to effectively improve heating efficiency.

Further, in step S205, if the indoor ambient temperature is greater than the fourth preset indoor ambient temperature, it means that the heating demand of the heat exchange environment is small at this time. In this case, the variable frequency compression is controlled. The machine runs at the seventh preset frequency, and all indoor fans are controlled to run at the eighth preset speed to maximize heating efficiency.

It should be noted that the present invention does not place any restrictions on the specific values of the third preset indoor ambient temperature and the fourth preset indoor ambient temperature. Those skilled in the art can set them by themselves according to actual use needs; preferably , the third preset indoor ambient temperature is set to 19°C, and the fourth preset indoor ambient temperature is set to 24°C, in order to maximize the accuracy of control.

In addition, it should be noted that the present invention does not place any restrictions on the specific values of the fifth preset frequency, the sixth preset frequency and the seventh preset frequency. Those skilled in the art can determine the specific values according to actual use. Need to set by yourself, as long as the fifth preset frequency is greater than the sixth preset frequency and is greater than the seventh preset frequency; as a preferred setting method, under heating conditions, Set the reference frequency of the variable frequency compressor to 90Hz, then the fifth preset frequency is 1 times the reference frequency, the sixth preset frequency is 0.6 times the reference frequency, and the seventh preset frequency is 0.4 times the reference frequency in order to maximize the accuracy of control; of course, those skilled in the art can also set the specific value of the reference frequency according to actual needs.

In addition, it should be noted that the present invention does not place any restrictions on the specific values of the fifth preset rotation speed, the sixth preset rotation speed, the seventh preset rotation speed and the eighth preset rotation speed. , those skilled in the art can set it themselves according to actual usage requirements, as long as the set fifth preset speed is greater than the sixth preset speed, is greater than the seventh preset speed, is greater than the eighth preset speed, that is, Yes; as a preferred setting method, under heating conditions, the reference speed of the indoor fan is set to 1100r/s, then the fifth preset speed is 1 times the reference speed, and the sixth preset speed is The preset speed is 0.7 times the base speed, the seventh preset speed is 0.5 times the base speed, and the eighth preset speed is 0.3 times the base speed, in order to maximize the accuracy of control and ensure refrigeration. Stable improvement of efficiency; of course, those skilled in the art can also set the specific value of the reference speed according to actual needs.

So far, the technical solution of the present invention has been described with reference to the preferred embodiments shown in the drawings. However, those skilled in the art can easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to relevant technical features, and technical solutions after these modifications or substitutions will fall within the protection scope of the present invention.

Claims (10)

1. A control method for an air conditioner. The air conditioner includes a refrigerant circulation circuit and a variable frequency compressor, a condenser, a throttling member and an evaporator arranged on the refrigerant circulation circuit. The air conditioner is characterized in that the evaporator includes a plurality of An evaporation section is arranged in parallel, an indoor fan is provided near the evaporation section, and a plurality of the evaporation sections are arranged to be selectively connected to the refrigerant circulation loop respectively. The control method includes:

   When the air conditioner is operating in cooling mode, obtain the outdoor ambient temperature;

   According to the outdoor ambient temperature, the access of multiple evaporation sections to the refrigerant circulation loop is controlled.
2. The control method according to claim 1, characterized in that the step of "controlling the access of multiple evaporation sections to the refrigerant circulation loop according to the outdoor ambient temperature" specifically includes:

   If the outdoor ambient temperature is greater than or equal to the first preset outdoor ambient temperature, further obtain the indoor ambient temperature;

   According to the indoor ambient temperature, the access of multiple evaporation sections to the refrigerant circulation loop is controlled.
3. The control method according to claim 2, characterized in that the step of "controlling the access of multiple evaporation sections to the refrigerant circulation loop according to the indoor ambient temperature" specifically includes:

   If the indoor ambient temperature is greater than the first preset indoor ambient temperature, control all of the plurality of evaporation sections to be connected to the refrigerant circulation loop;

   If the indoor ambient temperature is less than or equal to the first preset indoor ambient temperature and greater than or equal to the second preset indoor ambient temperature, control the first preset evaporation section to be connected to the refrigerant circulation loop;

   If the indoor ambient temperature is less than the second preset indoor ambient temperature, control the second preset evaporation section to be connected to the refrigerant circulation loop;

   Wherein, the first preset number is more than the second preset number.
4. The control method according to claim 2, characterized in that when the air conditioner is operating in cooling mode and the outdoor ambient temperature is greater than or equal to the first preset outdoor ambient temperature, the control method further includes :

   According to the indoor ambient temperature, the operating frequency of the variable frequency compressor and/or the rotational speeds of the plurality of indoor fans are controlled.
5. The control method according to claim 2, characterized in that the step of "controlling the access of multiple evaporation sections to the refrigerant circulation loop according to the outdoor ambient temperature" specifically includes:

   If the outdoor ambient temperature is lower than the first preset outdoor ambient temperature, a part of the plurality of evaporation sections is controlled to be connected to the refrigerant circulation loop.
6. The control method according to claim 5, characterized in that when the air conditioner is operating in cooling mode and the outdoor ambient temperature is less than the first preset outdoor ambient temperature, the control method further includes:

   Control the variable frequency compressor to operate at a preset frequency; and/or

   The indoor fans corresponding to a part of the plurality of evaporation sections connected to the refrigerant circulation loop are controlled to run at a preset speed.
7. The control method according to any one of claims 1 to 6, characterized in that the control method further includes:

   When the air conditioner is operating in the heating mode, all the plurality of evaporation sections are controlled to be connected to the refrigerant circulation loop.
8. The control method according to claim 7, characterized in that when the air conditioner is operating in heating mode, the control method further includes:

   Get the indoor ambient temperature;

   According to the indoor ambient temperature, the operating parameters of the air conditioner are controlled.
9. The control method according to claim 8, characterized in that the step of "controlling the operating parameters of the air conditioner according to the indoor ambient temperature" specifically includes:

   According to the indoor ambient temperature, the operating frequency of the variable frequency compressor and/or the rotational speeds of the plurality of indoor fans are controlled.
10. An air conditioner, characterized in that the air conditioner includes a controller capable of executing the control method described in any one of claims 1 to 9.

Images