WO2018108117A1

WO2018108117A1 - Refrigerator for improving stability of linear compressor, and control method therefor

Info

Publication number: WO2018108117A1
Application number: PCT/CN2017/116032
Authority: WO
Inventors: 姬立胜; 戚斐斐; 陶海波; 聂圣源; 刘建如
Original assignee: 青岛海尔股份有限公司
Priority date: 2016-12-14
Filing date: 2017-12-14
Publication date: 2018-06-21
Also published as: CN106524663A

Abstract

A method for controlling a refrigerator using a linear compressor (30), the method comprising: controlling the linear compressor (30) to run, when initially powered on, for a preset period of time (T1) at a preset input power, the preset input power being greater than a normal startup input power matching the linear compressor (30) and being less than or equal to the maximum input power of the linear compressor (30); and, when a startup mode begins, turning off part of a refrigerant loop, such that the pressure drop of the linear compressor (30) at the exhaust side is smooth at the beginning of the startup, thereby protecting the compressor.

Description

Refrigerator for improving linear compressor stability and control method thereof

This application claims the priority of the Chinese patent application filed on Dec. 14, 2016, the application number is 201611153003.4, the name of the invention is "the refrigerator for improving the stability of the linear compressor and its control method", the entire contents of which are incorporated by reference. In this application.

Technical field

The invention relates to the technical field of refrigerator control, in particular to a refrigerator using a linear compressor and a control method thereof.

Background technique

When the refrigerator with a linear compressor is first powered on, it will enter the high load control mode in order to cool down as quickly as possible. At this time, the linear compressor quickly reaches its maximum operating frequency at the first time, the piston stroke changes rapidly, and there is no long-term intersection between the vibration of the compressor itself and the resonance zone of the refrigerator, and the high-frequency noise at the initial stage of the refrigerator can be eliminated. However, the compressor is in the worst working condition, the pressure is reduced instantaneously, the displacement of the piston is the largest, the suspension spring at both ends of the compressor is at the maximum amplitude, and the connecting rod connecting the piston and the motor works in the limit state, which reduces the reliability of the compressor. Sex.

Summary of the invention

The object of the present invention is to solve the problem that the working condition of the linear compressor changes sharply at the moment of starting the refrigerator.

In order to achieve the above object, the present invention provides a refrigerator control method using a linear compressor, comprising:

Determining whether the refrigerator enters a startup state from a stopped state;

If yes, determine whether the compartment is higher than the preset temperature;

If yes, the startup mode is invoked, and the linear compressor is controlled to run at a preset input power for a first preset time, wherein

The preset input power is greater than a normal starting input power matched to the linear compressor, less than or equal to a maximum input power of the linear compressor; and

At the beginning of the startup mode, the refrigerant circuit is at least partially blocked.

As a further improvement of an embodiment of the present invention, the method further includes:

After the refrigerant circuit at least partially blocks the second predetermined time, the refrigerant circuit is resumed, wherein the second preset time is less than the first preset time.

As a further improvement of an embodiment of the present invention, the method further comprises: after the first predetermined time of operation of the linear compressor, exiting the startup mode, and controlling the linear compressor operation according to the indoor temperature of the refrigerator and the external ambient temperature.

As a further improvement of an embodiment of the invention, at the beginning of the start mode, the valve of the refrigerant circuit is closed to block the circuit.

As a further improvement of an embodiment of the present invention, the first preset time is at least one minute.

As a further improvement of an embodiment of the present invention, the second preset time is at least 5 seconds.

Another aspect of the present invention also provides a refrigerator using a linear compressor, including a refrigerant circuit and a computer board.

The computer board is used to determine whether the refrigerator enters the startup state from the stopped state, and controls the working mode of the linear compressor;

If the refrigerator enters the startup state from the stop state and the compartment is higher than the preset temperature, the startup mode is invoked, and the linear compressor is controlled to run at the preset input power for a first preset time, wherein

As a further improvement of an embodiment of the present invention, the refrigerator further includes a valve located in the refrigerant circuit, the computer board control valve is closed for a second preset time at the start of the startup mode, and the second preset time is less than the first preset time.

As a further improvement of an embodiment of the present invention, the refrigerator further includes a single chip microcomputer to time the first preset time and the second preset time.

Another aspect of the present invention also provides a refrigeration apparatus using a linear compressor, including a refrigerant circuit and a computer board.

The computer board is configured to determine whether the cooling device enters a startup state from a stopped state, and controls an operation mode of the linear compressor;

If the cooling device enters the startup state from the stop state and the compartment is higher than the preset temperature, the startup mode is invoked, and the linear compressor is controlled to run at the preset input power for a first preset time, wherein

Controlling the refrigerant circuit to at least partially block the second predetermined time at the beginning of the startup mode;

The second preset time is less than the first preset time.

Compared with the prior art, the present invention makes the linear compressor adopt the largest possible power to quickly cool down when the refrigerator enters the starting state from the stop state, and at the same time, the pressure drop of the exhaust side of the linear compressor is smoothed at the instant of energization, thereby improving the linear compression. The purpose of machine reliability.

DRAWINGS

1 is a schematic flow chart of a method for controlling a refrigerator according to an embodiment of the present invention;

2 is a schematic flow chart of a method for controlling a refrigerator in still another embodiment of the present invention;

3 is a schematic flow chart of a method for controlling a refrigerator in still another embodiment of the present invention;

4 is a schematic view of a refrigeration system of a refrigerator in an embodiment of the present invention.

detailed description

The invention will be described in detail below in conjunction with the specific embodiments shown in the drawings. However, the embodiments are not intended to limit the invention, and the structural, method, or functional changes made by those skilled in the art in accordance with the embodiments are included in the scope of the present invention.

In the embodiment of the present invention, the startup control method of the present invention is specifically explained by taking a refrigerator as an example, but it should be noted that the technical spirit involved in the following embodiments may alternatively be utilized for other forms of refrigeration. On the device, for example, a freezer. The invention inputs a linear compressor at the start-up stage with as much power as possible to quickly pass through the resonance band of the compressor to reduce the generation of noise while avoiding a sharp pressure drop at the instant of energization of the compressor. Referring to FIG. 1, the startup control method of the present invention includes:

If yes, the startup mode is invoked to enable the linear compressor to operate for a preset time T1 at a preset input power; the preset input power is greater than a normal startup input power matched to the linear compressor, less than or equal to the maximum input of the linear compressor The power, and, at the beginning of the start mode, that is, while the compressor is energized, partially or completely blocks the refrigeration system for a short preset time T2.

If the refrigerator is not started by the stop state when it is started, for example, after the pause is started, the normal control mode is entered.

Specifically, the stop state refers to the state of the refrigerator when there is no current flowing through the electronic device in the refrigerator. For example, before the refrigerator is first powered on, or before power is turned off for a long time, or before the user is powered on for the first time.

It can be understood that, in the stopped state, the temperature of the refrigerator compartment and the freezing compartment are the same, and the temperature of the refrigerator compartment may be the same as or similar to the room temperature.

In the conventional control mode of linear compressor, the starting input power is generally 8-10 times of the stable operating input power. For example, the linear compressor has a stable input power of 10w, then the linear compressor matches normally. The startup input power can reach 80w to 100w. The preset input power in this embodiment can be greater than 100W. Of course, it can also be directly set to the maximum input power, for example, 160w.

Generally, most types of linear compressors enter a stable working state one minute after power-on, so the preset time T1 in this embodiment is at least one minute. Of course, it is not excluded that a few types of linear compressors can enter a stable working state within one minute of power-on, and the preset time T1 can also be set to less than one minute.

When the refrigerator enters the starting state from the stopped state, the linear compressor is supplied with the normal starting input power that matches it, the piston stroke of the compressor is increased faster, and the pressure inside the casing is rapidly decreased. In order to avoid the process of rapid pressure drop of the compressor affecting the stability of the component, the compressor discharge side is slowed down by partially or completely blocking the refrigeration system circuit while the compressor is energized, and the compressor components are more moderate. The dynamic balance is achieved during the process. The blocking time T2 is shorter than the time T1 during which the compressor operates in the aforementioned preset input power in the startup mode, so that the compressor can still operate at the preset input power after the refrigeration cycle system is restored, and the cooling is fast. At this time, although the compressor maintains a relatively high power, damage to the components is small because the dynamic balance has been reached in the compressor.

Referring to Fig. 1, in an embodiment of the invention, while the compressor is energized, the fan is turned off to reduce the rate at which the refrigeration system delivers cold to the compartment, and after 5 seconds, the fan is turned on to resume air supply.

Referring to FIG. 2, in another embodiment of the present invention, while the compressor is energized, the solenoid valve disposed upstream of the capillary in the refrigerant circuit is closed to shut off the refrigerant passage, and the valve is opened after 5 seconds, and the refrigerant is restored. The evaporator flows.

Referring to Fig. 3, in another embodiment of the present invention, the damper of the air duct is closed to prevent cold air from flowing to the compartment, and the damper is opened after 5 seconds to realize the patency of the refrigeration circuit.

Further, before calling the startup mode, it is determined whether the compartment is higher than the preset temperature, and if so, the startup mode is invoked, and if not, the normal control mode is entered. Preferably, the compartment is a freezer compartment. The preset temperature is, for example, -5 °C. In this way, when the compartment is consistent with the environment and is at a low temperature, for example, in the winter at a high latitude, the mobilization start mode can be avoided, the loss of the compressor can be reduced, and energy can be saved.

After the linear compressor runs for a preset time T1, it exits the start mode and controls the linear compressor operation according to the indoor temperature of the refrigerator and the external ambient temperature.

Referring to Fig. 4, the refrigerator refrigeration system includes an evaporator, a capillary tube, a solenoid valve 10, a condenser 20, and a linear compressor 30 which are sequentially connected to form a circuit, in which the refrigerant circulates. The evaporator includes a refrigerating evaporator 41 and a refrigerating evaporator 43, and the capillary includes a refrigerating capillary 51 and a freezing capillary 53. Refrigerated evaporator 41 and refrigerated capillary The tubes 51 are connected, and the freezing evaporator 43 and the freezing capillary 53 are connected, and the two are connected in parallel. The solenoid valve 10 diverts the refrigerant to the refrigerating capillary 51 and/or the freezing capillary 53 to achieve the required cooling amount distribution of the refrigerating/freezing chamber. Further, the solenoid valve 10 is a three-way valve that can control the refrigeration or refrigeration system to separately or cooperatively cool.

The refrigerator includes at least a refrigerating compartment and a freezing compartment, both of which are arranged in a vertical direction. The refrigerating evaporator 41 is connected to the refrigerating duct 61, the duct 61 leads to the refrigerating compartment; the refrigerating evaporator 43 is connected to the freezing duct 63, and the duct 63 leads to the freezing compartment, so that the refrigerating evaporator 41 cools only the refrigerating compartment, and freezes The evaporator 43 cools only the freezer compartment. The

ducts

61, 63 are passages enclosed by a plurality of walls for introducing the air cooled by the

evaporators

41, 43 into the respective compartments. Each of the refrigerating duct 61 and the freezing duct 63 is provided with a refrigerating fan 81 and a refrigerating fan 83 to improve the cooling efficiency. A damper (not shown) may be provided between the

ducts

61, 63, and the damper may be controlled to open to allow the freezing evaporator 43 to exchange air with the refrigerating evaporator 41.

The refrigerator further includes a computer board for judging whether the refrigerator enters a startup state from a stopped state, and controls an operation mode of the linear compressor.

If yes, the startup mode is invoked to control the linear compressor to operate for a preset time T1 at a preset input power.

Among them, the preset time is measured by the single chip microcomputer. The preset input power is greater than a normal starting input power matched to the linear compressor, and is less than or equal to a maximum input power of the linear compressor.

The computer board also controls the refrigeration cycle system to at least partially block the preset time T2 at the beginning of the startup mode. T2 < T1.

Specifically, the computer board can control the fans 81 and/or 83 to be turned off for 5 seconds while the compressor is energized, and then turned on.

It is also possible to control the solenoid valve 10 in the refrigerant circuit to be closed for 5 seconds and then to open; or to control the damper to close after 5 seconds.

Further, after the preset time T1 is run, the startup mode is exited, and the linear compressor operation is controlled according to the indoor temperature of the refrigerator and the external ambient temperature.

Specifically, the indoor temperature of the refrigerator can be used to control the start and stop of the linear compressor. The external ambient temperature can be divided into a plurality of continuous temperature intervals, and the operating parameters of the linear compressor are set corresponding to each temperature interval. When the indoor temperature in the refrigerator is greater than the target temperature and the temperature difference from the target temperature is greater than the preset temperature difference, the linear compressor is correspondingly Run the parameter to run.

The above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that Modify the technical solutions described, or equate some of the technical features The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

A refrigerator control method using a linear compressor, comprising:

Determining whether the refrigerator enters a startup state from a stopped state;

If yes, determine whether the compartment is higher than the preset temperature;

If yes, the startup mode is invoked, and the linear compressor is controlled to run at a preset input power for a first preset time, wherein

The preset input power is greater than a normal starting input power matched to the linear compressor, less than or equal to a maximum input power of the linear compressor; and

At the beginning of the startup mode, the refrigerant circuit is at least partially blocked.
The method of controlling a refrigerator using a linear compressor according to claim 1, wherein the method further comprises:

After the refrigerant circuit at least partially blocks the second predetermined time, the refrigerant circuit is resumed, wherein the second preset time is less than the first preset time.
The method of controlling a refrigerator using a linear compressor according to claim 2, wherein the method further comprises:

After the first predetermined time of operation, the linear compressor exits the startup mode, and controls the linear compressor operation according to the indoor temperature of the refrigerator and the external environment temperature.
A refrigerator control method using a linear compressor according to claim 1, wherein at the start of the start mode, the valve of the refrigerant circuit is closed to block the refrigerant circuit.
The refrigerator control method using a linear compressor according to claim 2, wherein the second preset time is at least five seconds.
The refrigerator control method using a linear compressor according to claim 1, wherein the first preset time is at least one minute.
A refrigerator using a linear compressor, comprising: a refrigerant circuit and a computer board,

The computer board is configured to determine whether the refrigerator enters a startup state from a stopped state, and controls an operation mode of the linear compressor;

If the refrigerator enters the startup state from the stop state and the compartment is higher than the preset temperature, the startup mode is invoked, and the linear compressor is controlled to run at the preset input power for a first preset time, wherein

The preset input power is greater than a normal starting input power matched to the linear compressor, less than or equal to The maximum input power of the linear compressor; and,

At the beginning of the startup mode, the refrigerant circuit is at least partially blocked.
A refrigerator using a linear compressor according to claim 7, further comprising a valve located in the refrigerant circuit, the computer board controlling the valve to be closed for a second predetermined time at the start of the startup mode, and the second The preset time is less than the first preset time.
The refrigerator using a linear compressor according to claim 8, further comprising a single chip microcomputer to time the first preset time and the second preset time.