CN112460910A

CN112460910A - Control method of refrigerator compressor and refrigerator

Info

Publication number: CN112460910A
Application number: CN202011419819.3A
Authority: CN
Inventors: 刘�东
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-03-09
Anticipated expiration: 2040-12-07
Also published as: CN112460910B

Abstract

The invention provides a control method of a refrigerator compressor and a refrigerator_{Sign board}Calculating the actual thermal leakage load q according to the off-time of the compressor_{Sign board}If q is_{Fruit of Chinese wolfberry}≥q_{Sign board}At a predetermined speed V of the compressor_{Is provided with}Operation if q_{Fruit of Chinese wolfberry}＜q_{Sign board}At a predetermined speed V of the compressor_{Is provided with}+ a predetermined rotational speed increment, the predetermined rotational speed increment = (q)_{Sign board}‑q_{Fruit of Chinese wolfberry}) Energy efficiency ratio cop of compressor; the compressor operation load is increased after the door opening is detected or after the defrosting operation. Compared with the prior art, the invention can ensure that the running load of the compressor can provide enough refrigerating capacity, does not need to frequently adjust the running frequency of the compressor, and has good performanceAnd (4) energy saving effect.

Description

Control method of refrigerator compressor and refrigerator

Technical Field

The invention relates to air treatment equipment, in particular to a control method of a refrigerator compressor and a refrigerator.

Background

The refrigerator is a refrigeration device which keeps constant low temperature, is a common electric appliance for preserving food or other articles at low temperature in life, and is widely applied to the fields of life and industry. At present, the on-off of the compressor of the refrigerator is realized by sensing whether the temperature reaches the on-off point through a temperature sensor inside the refrigerator, however, for the frequency conversion compressor, the reasonable rotating speed for starting the compressor needs to be determined to ensure that enough cold energy is provided, in order to determine a reasonable rotation speed, the prior art generally measures the internal temperature change of the motor, further, the rotation speed of the compressor is continuously changed, so that the change range of the compression rotation speed is too frequent, which is not beneficial to energy saving, in addition, different temperature change conditions can occur in different temperature areas of the refrigerator, for a single system refrigerator, the working speed of the compressor can be determined only according to the change condition of one temperature zone, other temperature zones cannot be considered, so that the rotating speed of the compressor cannot be reasonably adjusted in the prior art, the variation range of the compressor is too frequent, which is not beneficial to energy saving, and the temperature requirements of each greenhouse of the refrigerator can not be well considered.

Disclosure of Invention

The invention provides a control method of a refrigerator compressor and a refrigerator, and solves the technical problem that the working rotating speed of the compressor is unreasonable to adjust in the prior art.

The technical scheme adopted by the invention is as follows: a control method of refrigerator compressor is characterized by that when the compressor is switched on again after being switched off, the operation load of compressor can be defined according to the external temperature of refrigerator and the switching-off time of compressor.

Further, a preset heat leakage load q is obtained through calculation according to the outside temperature of the refrigerator_{Sign board}Calculating to obtain the actual heat leakage load q according to the off-time of the compressor_{Fruit of Chinese wolfberry}Comparing the preset heat leakage load q_{Sign board}And the actual heat leak load q_{Fruit of Chinese wolfberry}The operating load of the compressor is determined.

Further, if the thermal leakage load q is preset_{Sign board}Not less than the actual thermal leakage load q_{Fruit of Chinese wolfberry}The compressor starts to operate at a preset rotational speed.

Further, if the thermal leakage load q is preset_{Sign board}< actual Heat Exposure load q_{Fruit of Chinese wolfberry}The compressor begins to operate at the preset speed + the preset speed increment.

Further, the preset rotation speed increment = (actual thermal leakage load q)_{Fruit of Chinese wolfberry}-a preset heat leak load q_{Sign board}) Energy efficiency ratio cop of compressor.

Further, the preset rotation speed is a preset heat leakage load q_{Sign board}Energy efficiency ratio cop of compressor 1.25.

Further, when the temperature in the refrigerator drops to a first preset temperature T₁When the temperature in the refrigerator rises to a second preset temperature T, the compressor is stopped₂When so, the compressor is turned on.

Further, the actual thermal leakage load q_{Fruit of Chinese wolfberry}= (second preset temperature T)₂-a first preset temperature T₁) Refrigerator volume 1020 compressor off time.

A refrigerator includes a controller that controls a compressor operation load according to the control method.

Compared with the prior art, the running load of the compressor is determined by the temperature outside the refrigerator and the off-time of the compressor, so that the running load when the compressor is started is accurately regulated and controlled, the starting rotating speed of the compressor is reasonably regulated, the running load of the compressor can be ensured to provide enough refrigerating capacity, the running frequency of the compressor does not need to be frequently regulated, and the energy-saving effect is good.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a flow chart illustrating a method for controlling a compressor of a refrigerator according to the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The refrigerator comprises a controller, wherein the controller controls the starting and stopping or the operating frequency of the compressor according to the temperature of the refrigerating chamber or the freezing chamber of the refrigerator, and each chamber in the refrigerator is kept in a reasonable temperature range.

As shown in fig. 1, the control method of a refrigerator compressor proposed in the present application includes:

monitoring the temperature of the refrigerating chamber (also can be a freezing chamber) in real time, and when the monitored room temperature of the refrigerating chamber is lower than a first preset temperature T₁When the temperature of the refrigerating chamber is too low, the food materials in the refrigerating chamber are frozen, and the controller controls the compressor to be turned off to avoid the continuous reduction of the temperature in the refrigerating chamber; when the compressor is in a closed state, the room temperature in the refrigerating chamber can continuously rise, the room temperature of the refrigerating chamber can be maintained by controlling the air volume introduced into the refrigerating chamber of the freezing chamber, and when the room temperature in the freezing chamber rises to a second preset temperature T when being monitored₂At this time, the controller controls the compressor to be turned on to prevent the room temperature in the refrigerating chamber from continuously rising and reduce the temperature in the refrigerating chamber.

The application is based on a load determination scheme of a compressor when the compressor is restarted, and specifically comprises the following steps: firstly, when the compressor meets the starting condition, the controller firstly detects the outdoor temperature of the refrigerating chamber, and the preset heat leakage load q of the compressor is calculated according to the temperature difference value between the outdoor temperature and the indoor temperature of the refrigerating chamber, the external dimension of the refrigerator and the thickness of the heat insulating layer of the refrigerator_{Sign board}(ii) a Then, according to the time of the compressor off, the volume of the refrigerator, the first preset temperature T₁And a second preset temperature T₂Calculating the temperature difference value to obtain the actual heat leakage load q_{Fruit of Chinese wolfberry}。

Further, a heat leakage load q is preset_{Sign board}=q₁+q₂(ii) a Wherein, the refrigerator thermal insulation layer heat leakage load q₁=K*A*ΔT， K=1（1/α₁+δ/λ+1/α₂) K is the heat transfer coefficient, A is the heat transfer area, Δ T is the heat transfer temperature difference, i.e., the temperature difference between the inside and outside of the refrigerator, α₁、α₂The heat convection coefficient inside and outside the refrigerator; delta is the thickness of the heat insulation layer, lambda is the heat conductivity coefficient of the box body material, and q is obtained after simplification₁=A*ΔT*（λ/δ）；q₂For thermal leakage load at the door seal, q₂Take 0.15 q₁To 0.3 q₁。

Further, the actual heat leakage load q_{Fruit of Chinese wolfberry}= (second preset temperature T)₂-a first preset temperature T₁) Volume of refrigerator 1020 time compressor off.

Step two, determining the starting operation load of the compressor by comparing a preset thermal leakage load q standard with an actual thermal leakage load q real, specifically: when the preset heat leakage load q is set_{Sign board}Not less than the actual thermal leakage load q_{Real time}The compressor is operated at a preset rotating speed; when the preset heat leakage load q mark is smaller than the actual heat leakage load q in real time, the compressor rotates at the preset rotating speed V_{Is provided with}The operation is performed by increasing the preset rotational speed increment.

Preferably, the preset rotation speed of the compressor is a preset thermal leakage load q_{Sign board}Energy efficiency ratio cop of compressor 1.25.

Further, the preset rotation speed increment is (q)_{Sign board}-q_{Fruit of Chinese wolfberry}) The cop is the energy efficiency ratio of the compressor, and the cold requirement of the refrigerator can be well ensured by ensuring the operation load of the compressor.

In the running process of the refrigerator, the rotating speed of the compressor can be influenced by other factors, for example, when the refrigerator is defrosted, the rotating speed of the compressor is increased by a certain amount on the basis of the preset rotating speed when the compressor is started again, and the increment of the running rotating speed of the compressor can be determined by the actual temperature of the refrigerator and the second preset temperature T₂The difference is obtained, or the compressor is directly operated at the highest rotation speed to rapidly increase the temperature in the refrigerator chamber; when the refrigerator has the over-opening door action in the period, the controller can also be based on the door opening timeThe length of the interval is given by an incremental value of the compressor speed, and the speed at which the compressor is operated again is increased by the incremental value to ensure quick temperature return of the refrigerator.

According to the control method provided by the application, the operation rate of the compressor reaches more than 80%, and the operation rate is the sum of the on-time and the off-time of the compressor in one period of the on-time ratio of the compressor.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A control method of a compressor of a refrigerator is characterized in that when the compressor is switched on again after being switched off, the operation load of the compressor is determined according to the outside temperature of the refrigerator and the switching-off time of the compressor.

2. The control method according to claim 1, wherein a preset heat leakage load q is calculated from the refrigerator outside temperature_{Sign board}Calculating to obtain the actual heat leakage load q according to the off-time of the compressor_{Fruit of Chinese wolfberry}Comparing the preset heat leakage load q_{Sign board}And the actual heat leak load q_{Fruit of Chinese wolfberry}The operating load of the compressor is determined.

3. The control method according to claim 2, wherein the load q is set if the thermal leakage load q is predetermined_{Sign board}Not less than the actual thermal leakage load q_{Fruit of Chinese wolfberry}At a predetermined speed V of the compressor_{Is provided with}The operation is started.

4. A control method according to claim 3, characterized in that if the thermal leakage load q is preset_{Sign board}< actual Heat Exposure load q_{Fruit of Chinese wolfberry}At a predetermined speed V of the compressor_{Is provided with}The + preset rpm increment starts operation.

5. The control method according to claim 4, characterized in thatIn that the preset rotation speed increment = (actual thermal leakage load q)_{Fruit of Chinese wolfberry}-a preset heat leak load q_{Sign board}) Energy efficiency ratio cop of compressor.

6. The control method according to claim 3, wherein the preset rotation speed is a preset thermal leakage load q_{Sign board}Energy efficiency ratio cop of compressor 1.25.

7. The control method as set forth in claim 2, wherein when the temperature in the refrigerator falls to a first preset temperature T₁When the temperature in the refrigerator rises to a second preset temperature T, the compressor is stopped₂When so, the compressor is turned on.

8. Control method according to claim 7, characterized in that the actual thermal leakage load q_{Fruit of Chinese wolfberry}= (second preset temperature T)₂-a first preset temperature T₁) Refrigerator volume 1020 compressor off time.

9. A refrigerator comprising a controller, characterized in that the controller controls a compressor operation load according to the control method of any one of claims 1 to 8.