WO2020098332A1

WO2020098332A1 - Compressor oil return method for compression refrigeration or heating device

Info

Publication number: WO2020098332A1
Application number: PCT/CN2019/103098
Authority: WO
Inventors: 张飞; 陆建松; 孙龙; 姚永祥; 张立智
Original assignee: 青岛海尔空调器有限总公司; 海尔智家股份有限公司
Priority date: 2018-11-13
Filing date: 2019-08-28
Publication date: 2020-05-22
Also published as: CN109539630B; CN109539630A

Abstract

A compressor oil return method for a compression refrigeration or heating device, comprising: Step S100, measuring the ambient temperature tao to which a compressor is exposed; Step S102, determining, according to the ambient temperature tao, a retention time y for which the compressor is to retain at a first oil return frequency; and Step S104, enabling the compressor to run at the first oil return frequency for the retention time y. Said oil return method improves the running of the compressor oil return, improves the rapid refrigeration and heating effect, and ensures sufficient oil return of the compressor.

Description

Compressor oil return method for compression refrigeration or heating device

Technical field

The invention relates to the field of refrigeration and heating, in particular to a compressor oil return method for a compression refrigeration or heating device.

Background technique

During the operation of the air conditioner, when the refrigerant flows through the compressor, the lubricant in the compressor will be taken away. When the air conditioner is operated at a low frequency, the pressure in the refrigerant channel decreases, which reduces the flow rate of the lubricant and refrigerant, resulting in the compressor Failure due to insufficient lubricant. The oil return of the existing air conditioner is generally carried out in a fixed frequency and running for a fixed time. Generally, two oil return platforms are set up, and the long running time of the first oil return platform affects the effect of rapid cooling and heating. In addition, the frequency of the second oil return platform is generally higher, and it will not be achieved every time it runs, but regardless of whether the target frequency is greater or less than the first oil return platform, the compressor must be forced to reach the first oil return platform when the compressor starts to run, so the first return The oil platform has a greater influence on the cooling and heating effect.

Summary of the invention

The present invention aims to overcome at least one defect of the oil return of the existing air conditioner compressor, provide a compressor oil return method for a compression refrigeration or heating device, improve the compressor oil return operation, and improve the rapid cooling and heating effect, And ensure that the compressor returns oil adequately.

To this end, the present invention proposes a compressor oil return method for a compression refrigeration or heating device, which includes:

Detecting the ambient temperature t _ao where the compressor is located;

Determine the residence time y of the compressor at the first oil return frequency according to the ambient temperature t _ao ;

The compressor is operated to the first oil return frequency, and the residence time y is operated.

Preferably, the relationship between the residence time y and the ambient temperature t _ao is:

y = ab * INT [t _ao / c]; and

a is a fixed time constant; b is a regional distinction constant; c is a weight parameter;

When y <0, take y = 0.

Preferably, the value range of a is 10-120; the value range of b is 2-12; and the value range of c is 1-10.

Preferably, the compressor oil return method further includes:

Determine a target frequency for subsequent operation of the compressor according to a subsequent preset program of the compression refrigeration or heating device;

If the target frequency is greater than the first oil return frequency and greater than the second oil return frequency, the compressor is operated to the second oil return frequency for a preset time; the second oil return The frequency is greater than the first oil return frequency;

After the preset time, the compressor is operated to the target frequency.

Preferably, after the compressor is started, the compressor is operated from 0 Hz to the first oil return frequency, and the residence time y is operated.

Preferably, a is preferably 60; b is preferably 6 or 8; c is preferably 4;

The compression refrigeration or heating device is an air conditioner.

The inventors of the present invention have found that it is more difficult for the compressor to return oil in a lower temperature state, so the longer the oil return operation is required, and the higher the ambient temperature, the lower the viscosity of the lubricating oil and the oil return The more sufficient, therefore, in the compressor oil return method for compression refrigeration or heating devices proposed by the present invention, a program that relates the compressor oil return to the ambient temperature is designed, so that the compressor only needs a short time oil return during cooling It can be operated to high frequency, which improves the rapid cooling effect and improves the user experience. That is, the compressor oil return method for a compression refrigeration or heating device of the present invention improves the oil return operation of the compressor, improves the effect of rapid cooling and heating, and ensures that the compressor returns oil sufficiently.

According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will understand more the above and other objects, advantages, and features of the present invention.

BRIEF DESCRIPTION

Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary but non-limiting manner with reference to the drawings. The same reference numerals in the drawings indicate the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

FIG. 1 is a schematic flowchart of a compressor oil return method according to an embodiment of the present invention.

detailed description

FIG. 1 is a schematic flowchart of a compressor oil return method according to an embodiment of the present invention. As shown in FIG. 1, an embodiment of the present invention provides a compressor oil return method for a compression refrigeration or heating device. The compressor oil return method may include the following steps:

In step S100, the ambient temperature t _ao where the compressor is located is detected. That is, the ambient temperature of the compression refrigeration or heating device is detected to control the return oil of the compressor according to the ambient temperature.

In step S102, the residence time y of the compressor staying at the first oil return frequency is determined according to the ambient temperature t _ao .

In step S104, the compressor is operated to the first oil return frequency, and the operation residence time y.

The inventors of the present invention have found that it is more difficult for the compressor to return oil in a lower temperature state, so the longer the oil return operation is required, and the higher the ambient temperature, the lower the viscosity of the lubricating oil and the oil return The more sufficient, therefore, in the compressor oil return method for compression refrigeration or heating devices proposed by the present invention, a program that relates the compressor oil return to the ambient temperature is designed, so that the compressor only needs a short time oil return during cooling It can be operated to high frequency, which improves the rapid cooling effect and improves the user experience. That is, the compressor oil return method for a compression refrigeration or heating device of the present invention improves the oil return operation of the compressor, improves the effect of rapid cooling and heating, and ensures that the compressor returns oil sufficiently. It can be matched with the system for protection and control to match the changes in the environment, which is convenient for rapid cooling and heating, while fully guaranteeing the lubrication performance of the compressor.

In some embodiments of the present invention, the relationship between the residence time y and the ambient temperature t _ao is:

y = ab * INT [t _ao / c]; and a is a fixed time constant; b is a region distinguishing constant; c is a weight parameter; when y <0, y = 0 is taken. The unit of y is seconds, and the unit of t _ao is degrees Celsius. In the calculation process of the above relationship, only the numerical values are used for calculation, not included in the unit. INT is a function that rounds a number down to the nearest integer.

Further, the value range of a is 10-120, preferably 60. The value range of b is 2-12, preferably 6, 8, etc., 6 in normal areas and 8 in cold areas. The value range of c is 1-10, preferably 4. The compression refrigeration or heating device is an air conditioner. Further, after the compressor is started, the compressor is operated from 0 Hz to the first oil return frequency, and the operating residence time is y, so that the compressor returns oil.

In some embodiments of the present invention, the compressor oil return method further includes: determining a target frequency for subsequent operation of the compressor according to a subsequent preset program of the compression refrigeration or heating device. If the target frequency is greater than the first oil return frequency and greater than the second oil return frequency, the compressor is operated to the second oil return frequency for a preset time; the second oil return frequency is greater than the first oil return frequency. After a preset time, the compressor is run to the target frequency. If the target frequency is other conditions, just run the compressor to the target frequency.

In this embodiment, the compressor starts from 0HZ after receiving the start signal, the frequency increase reaches the first oil return platform, that is, the first oil return frequency, and then stays on the first oil return platform for a stable operation time y (the above stop Time y), after the operation of the first oil return platform is completed, the frequency is determined to increase, maintain, or decrease according to environmental parameters, etc. When the rising conditions are met, the frequency continues to increase to reach the second oil return platform (ie, the second oil return frequency) and maintain For a certain period of time, the frequency of the second oil return platform is generally high, and it will not be achieved every time it runs. However, regardless of whether the target frequency is greater or less than the first oil return platform, the compressor must reach the first oil return platform and stay for the time when the compressor starts to run y.

In some specific embodiments of the present invention, if performed according to a general region, a = 60, b = 6, and c = 4. then

Ambient temperature t _ao = 25 ° C, then y = 60-6 * INT [25/4] = 60-36 = 24s;

Ambient temperature t _ao = 38 ℃, then y = 60-6 * INT [38/4] = 60-54 = 6s;

Ambient temperature t _ao = 53 ° C, then y = 60-6 * INT [53/4] = 60-78 = -18s <0, then y = 0s;

Ambient temperature t _ao = -2 ° C, then y = 60-6 * INT [-2/4] = 60-(-6) = 66s;

Ambient temperature t _ao = -10 ° C, then y = 60-6 * INT [-10/4] = 60-(-18) = 78s. From these specific examples, it can be seen that as the ambient temperature increases during cooling, the shorter the oil return time, the faster the cooling speed; conversely, the heating return with the ambient temperature decreases, the more the oil return time The longer the oil return, the less the protective wear of compression and the longer the service life.

At this point, those skilled in the art should realize that although a number of exemplary embodiments of the present invention have been shown and described in detail herein, they can still be The content directly determines or derives many other variations or modifications that conform to the principles of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all these other variations or modifications.

Claims

A compressor oil return method for compression refrigeration or heating devices, including:

Detecting the ambient temperature t ao where the compressor is located;

Determine the residence time y of the compressor at the first oil return frequency according to the ambient temperature t ao ;

The compressor is operated to the first oil return frequency, and the residence time y is operated.
The compressor oil return method according to claim 1, wherein

The relationship between the residence time y and the ambient temperature t ao is:

y = ab * INT [t ao / c]; and

a is a fixed time constant; b is a regional distinction constant; c is a weight parameter;

When y <0, take y = 0.
The oil return method of a compressor according to claim 2, wherein:

The value range of a is 10-120; the value range of b is 2-12; the value range of c is 1-10.
The oil return method of a compressor according to claim 1, further comprising:

Determine a target frequency for subsequent operation of the compressor according to a subsequent preset program of the compression refrigeration or heating device;

If the target frequency is greater than the first oil return frequency and greater than the second oil return frequency, the compressor is operated to the second oil return frequency for a preset time; the second oil return The frequency is greater than the first oil return frequency;

After the preset time, the compressor is operated to the target frequency.
The compressor oil return method according to claim 1, wherein

After the compressor is started, the compressor is operated from 0 Hz to the first oil return frequency, and the residence time y is operated.
The oil return method of a compressor according to claim 3, wherein

a is preferably 60; b is preferably 6 or 8; c is preferably 4;

The compression refrigeration or heating device is an air conditioner.