CN108775741A - Air conditioner defrosting control method - Google Patents

Abstract

The invention belongs to the technical field of air conditioners, and in particular relates to an air conditioner defrosting control method. In order to prevent the room temperature from fluctuating too much during defrosting, the air conditioner defrosting control method proposed by the present invention includes the following steps: During the heating operation of the air conditioner, it is judged whether the air conditioner meets the defrosting conditions; Before the compressor enters the defrosting mode, obtain the indoor ambient temperature; compare the indoor ambient temperature with the preset temperature, and selectively control the operating frequency of the compressor, the opening degree of the throttle valve, or the indoor unit and/or outdoor unit according to the comparison result fan speed. The present invention selectively controls the operating frequency of the compressor, the opening of the throttle valve or the fan speed of the indoor unit and/or the outdoor unit based on the difference between the preset temperature and the indoor ambient temperature to store a part of the energy, during the defrosting process of the air conditioner During the defrosting process, this part of energy is replenished to the room, thus effectively preventing the room temperature from fluctuating too much during defrosting.

Description

Air conditioner defrosting control method

technical field

The invention belongs to the technical field of air conditioners, and in particular relates to an air conditioner defrosting control method.

Background technique

As a device that can adjust the indoor ambient temperature, the air conditioner works on the principle that the indoor ambient temperature is reduced or increased by the refrigerant passing through the circulation pipeline through high-pressure/low-pressure/gas/liquid state transitions, that is, from From the perspective of the indoor unit, the air conditioner is in cooling or heating mode. When the air conditioner is in heating operation, if the temperature of the outdoor coil is too low under certain humidity conditions, it will cause frosting, and the frosting of the outdoor coil will reduce the heat exchange efficiency of the outdoor heat exchanger and affect the cooling performance of the air conditioner. The thermal effect reduces the comfort of the indoor environment and affects the user experience. Therefore, when the air conditioner is in a heating condition, timely and effective defrosting of the outdoor coil of the air conditioner is required.

Existing household air conditioners will judge whether the air conditioner is in the frosting state through various methods during the heating process, for example, use the running time + outdoor coil temperature to judge whether to enter the defrosting state. When it is judged that the air conditioner is in a frosting state, the air conditioner is put into a defrosting mode, but this mode easily causes large fluctuations in the indoor temperature.

Therefore, the present invention proposes a new defrosting control method to reduce the impact on the indoor temperature during the defrosting process.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, in order to prevent the room temperature from fluctuating too much during defrosting, the present invention proposes a defrosting control method for an air conditioner. The defrosting control method includes the following steps: During the process, it is judged whether the air conditioner meets the defrosting conditions; if so, before the air conditioner enters the defrosting mode, the indoor ambient temperature is obtained; the indoor ambient temperature is compared with the preset temperature, and selectively controlled according to the comparison result The operating frequency of the compressor, the opening of the throttle valve or the fan speed of the indoor unit and/or outdoor unit.

In a preferred implementation of the above air conditioner defrosting control method, "compare the indoor ambient temperature with the preset temperature, and selectively control the operating frequency of the compressor, the opening of the throttle valve or the indoor unit and/or outdoor unit according to the comparison result. The steps of calculating the difference pn = preset temperature - indoor ambient temperature; if pn ≥ set value, increase the operating frequency of the compressor; if pn < set value, maintain the operation of the compressor Keep the frequency unchanged, and reduce the throttle valve opening, and/or reduce the fan speed of the indoor unit and/or outdoor unit.

In a preferred implementation of the above air conditioner defrosting control method, if pn≥set value, then the operating frequency of the compressor is increased by 10-15 Hz.

In a preferred implementation of the above air conditioner defrosting control method, if pn<set value, then reduce the opening degree of the throttle valve by 20-40 steps.

In a preferred implementation of the method for controlling the defrosting of the air conditioner, if pn<the set value, the fan speed of the indoor unit and/or the outdoor unit is reduced by 40-60rpm.

In a preferred implementation of the method for controlling the defrosting of the air conditioner, if pn<the set value, then reduce the fan speed of the indoor unit and/or the outdoor unit by 50rpm.

In a preferred implementation of the above air conditioner defrosting control method, the set value is any value between 0-2.

In a preferred implementation of the above air conditioner defrosting control method, the set value is 1.

In a preferred implementation of the above air conditioner defrosting control method, the preset temperature can be selected within the range of 16-30°C.

Through the technical solution of the present invention, before the air conditioner enters the defrosting mode, the operating frequency of the compressor, the opening degree of the throttle valve, or the indoor unit and/or the outdoor unit are selectively controlled based on the difference between the preset temperature and the indoor ambient temperature During the defrosting process of the air conditioner, this part of energy is replenished to the room, thus effectively preventing the room temperature from fluctuating too much during defrosting. Those skilled in the art can understand that, taking the difference between the preset temperature and the indoor ambient temperature as a reference value, the corresponding energy storage method can be accurately selected, thereby minimizing fluctuations in room temperature during defrosting.

Description of drawings

Fig. 1 is a schematic flow chart of the main process of the air conditioner defrosting control method of the present invention.

Detailed ways

In order to make the embodiments, technical solutions and advantages of the present invention more obvious, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Example. 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 protection scope of the present invention.

As shown in Figure 1, the defrosting control method of the present invention includes the following steps: S110, in the process of air conditioner heating operation, judge whether the air conditioner satisfies the defrosting condition; S120, if so, then enter the defrosting Before the mode, obtain the indoor ambient temperature; S130, compare the indoor ambient temperature with the preset temperature, and selectively control the operating frequency of the compressor, the opening of the throttle valve, or the fan speed of the indoor unit and/or the outdoor unit according to the comparison result. Wherein, the preset temperature can be customized by the user, and usually the preset temperature can be set to a temperature between 16-30°C. Through steps S110-S130, based on the indoor ambient temperature and the preset temperature, the operating frequency of the compressor, the opening of the throttle valve, or the fan speed of the indoor unit and/or the outdoor unit are selectively controlled, so that before the air conditioner performs defrosting Store a part of energy. In this way, during the defrosting process, the stored energy can be supplemented to the indoor heating capacity, which reduces the influence of the air conditioner on the indoor temperature during the defrosting process to a certain extent, thus It can effectively prevent the room temperature from fluctuating too much during defrosting.

In step S110, when judging whether the air conditioner satisfies the defrosting conditions, those skilled in the art can choose any known judging method, and the present invention does not limit the specific defrosting conditions here.

In step S130, calculate the difference pn=preset temperature-indoor ambient temperature; if pn≥set value, increase the operating frequency of the compressor; if pn<set value, maintain the compressor operating frequency unchanged, And reduce the opening degree of the throttle valve, and/or reduce the fan speed of the indoor unit and/or outdoor unit. Wherein, the set value can be any value between 0-2, and in this embodiment, the set value is 1.

As an example, when pn≥1, the operating frequency of the compressor is increased by 10-15 Hz. Those skilled in the art can understand that during the defrosting process of the air conditioner, the indoor heating capacity will decrease, and if the frequency of the compressor is increased before entering the defrosting, and a part of energy is stored in the compressor, then the air conditioner will defrost. During the defrosting process, this part of energy is replenished to the room, thus effectively preventing the room temperature from fluctuating too much during defrosting.

As an example, when pn<1, reduce the opening of the throttle valve by 20-40 steps; or reduce the fan speed of the indoor unit and/or outdoor unit by 40-60rpm, preferably the indoor unit and/or outdoor unit The fan speed is reduced by 50rpm. In this way, a part of energy can be stored before defrosting, and then this part of energy can be replenished indoors during the defrosting process of the air conditioner, thereby effectively preventing excessive room temperature fluctuations during defrosting.

To sum up, through the technical solution of the present invention, before the air conditioner enters the defrosting mode, the operating frequency of the compressor, the opening of the throttle valve or the indoor unit can be selectively controlled based on the difference between the preset temperature and the indoor ambient temperature. And/or the fan speed of the outdoor unit to store a part of energy, and this part of energy is replenished indoors during the defrosting process of the air conditioner, thereby effectively preventing excessive room temperature fluctuations during defrosting. Those skilled in the art can understand that, taking the difference between the preset temperature and the indoor ambient temperature as a reference value, the corresponding energy storage method can be accurately selected, thereby minimizing fluctuations in room temperature during defrosting.

So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings, but those skilled in the art will 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 the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims (9)

1. An air conditioner defrosting control method is characterized in that, said defrosting control method comprises the following steps: During the heating operation of the air conditioner, judge whether the air conditioner meets the defrosting conditions; If yes, before the air conditioner enters the defrosting mode, obtain the indoor ambient temperature; Comparing the indoor ambient temperature with the preset temperature, and selectively controlling the operating frequency of the compressor, the opening degree of the throttle valve or the fan speed of the indoor unit and/or the outdoor unit according to the comparison result. 2. The air conditioner defrosting control method according to claim 1, characterized in that, "comparing the indoor ambient temperature with the preset temperature, and selectively controlling the operating frequency of the compressor, the opening of the throttle valve or Indoor unit and/or outdoor unit fan speed" steps include: Calculated difference pn = preset temperature - indoor ambient temperature; If pn≥set value, increase the operating frequency of the compressor; If pn<the set value, then maintain the operating frequency of the compressor unchanged, reduce the opening of the throttle valve, and/or reduce the fan speed of the indoor unit and/or the outdoor unit. 3. The air conditioner defrosting control method according to claim 2, characterized in that, if pn≥set value, the operating frequency of the compressor is increased by 10-15hz. 4. The air conditioner defrosting control method according to claim 2, characterized in that, if pn<set value, then reduce the opening degree of the throttle valve by 20-40 steps. 5. The air conditioner defrosting control method according to claim 2, characterized in that if pn<set value, then reduce the fan speed of the indoor unit and/or outdoor unit by 40-60rpm. 6. The air conditioner defrosting control method according to claim 5, characterized in that, if pn<set value, then reduce the fan speed of the indoor unit and/or outdoor unit by 50rpm. 7. The air conditioner defrosting control method according to any one of claims 2-6, characterized in that the set value is any value between 0-2. 8. The air conditioner defrosting control method according to claim 7, wherein the set value is 1. 9. The air conditioner defrosting control method according to any one of claims 1 to 6, characterized in that the preset temperature can be selected within the range of 16-30°C.