阅读说明：本技术 压缩机过负荷保护的方法、装置和计算机可读存储介质 (Method, apparatus and computer readable storage medium for compressor overload protection ) 是由 陈翔 张峰 刘冰如 于 2020-04-25 设计创作，主要内容包括：本发明提出一种压缩机过负荷保护的方法,装置和计算机可读存储介质。所述方法包括：检测实时温度,将检测的实时温度与多个预设的温度阈值形成的温度区间进行比较；当实时温度位于A1区间时,控制压缩机按照预设的主控程序运行；当实时温度位于A2区间时,控制压缩机按照预设的主控程序的降频指令运行降频调节；当实时温度位于A3区间时,控制压缩机以预设的频率调整值进行降频调节；当实时温度位于A4区间时,控制压缩机停机,基于不同的温度划分温度区间对压缩机进行降频控制,通过调节来使压缩机跳出过负荷运行状态,减少直接停机的次数,以延长压缩机的正常使用时间。(The invention provides a method, a device and a computer readable storage medium for overload protection of a compressor. The method comprises the following steps: detecting real-time temperature, and comparing the detected real-time temperature with a temperature interval formed by a plurality of preset temperature thresholds; when the real-time temperature is in the A1 interval, controlling the compressor to operate according to a preset main control program; when the real-time temperature is in the interval A2, controlling the compressor to operate the frequency reduction regulation according to the frequency reduction instruction of the preset main control program; when the real-time temperature is in the interval A3, controlling the compressor to perform down-conversion adjustment at a preset frequency adjustment value; when the real-time temperature is in the A4 interval, the compressor is controlled to stop, the compressor is subjected to down-conversion control based on different temperature division temperature intervals, the compressor is enabled to jump out of an overload running state through adjustment, the number of times of direct stop is reduced, and the normal service time of the compressor is prolonged.)

1. A method of compressor overload protection, the method comprising:

detecting the real-time temperature of the condenser, and comparing the detected real-time temperature with a temperature interval formed by a plurality of preset temperature thresholds;

when the real-time temperature is in the A1 interval, controlling the compressor to operate according to a preset main control program;

when the real-time temperature is in the interval A2, controlling the compressor to operate the frequency reduction regulation according to the frequency reduction instruction of the preset main control program;

when the real-time temperature is in the interval A3, controlling the compressor to perform down-conversion adjustment at a preset frequency adjustment value;

and when the real-time temperature is in the A4 interval, controlling the compressor to stop.

2. The method of claim 1, wherein the step of controlling the compressor to perform the down-regulation at the preset frequency adjustment value when the real-time temperature is within the interval of a3 comprises:

and when the real-time temperature is in the interval A31, controlling the compressor to perform down-regulation at the first frequency regulation value.

3. The method of claim 2, wherein the step of controlling the compressor to perform the down-regulation at the preset frequency adjustment value when the real-time temperature is within the interval of a3 further comprises:

and when the real-time temperature is in the interval A32, controlling the compressor to perform down-conversion adjustment by a second frequency adjustment value, wherein the second frequency adjustment value is greater than the first frequency adjustment value.

4. The method of compressor overload protection according to claim 2, wherein the first frequency is a drop Δ H1 cycles per Δ a time.

5. The method of claim 3, wherein said second frequency is a drop of Δ H2 cycles per Δ A time, Δ H1 < ΔH 2.

6. A compressor control apparatus, characterized in that the compressor control apparatus comprises the control method of compressor overload protection according to any one of the preceding claims 1 to 5.

7. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.

Technical Field

The invention relates to the technical field of heating ventilation, in particular to a method and a device for overload protection of a variable frequency compressor and a computer readable storage medium.

Background

With the rapid development of modern cities, the high-efficiency energy utilization plays an important role in the sustainable development of the cities and the reduction of carbon emission. Air conditioners and heat pumps are reasonable high-efficiency energy modes, and multiple portions of heat energy can be obtained by using only one portion of electric energy by utilizing the Carnot cycle principle. The core of the air conditioner and the heat pump is a compressor, the service life of the air conditioner and the service life of the heat pump are directly influenced by the service life of the compressor, the conventional protection control of the compressor is mainly realized by directly stopping the compressor when the running current reaches the maximum value so as to protect the compressor to enable the compressor to jump out of an overload running state, the motor is frequently stopped when the current reaches the maximum value, and the compressor is greatly damaged.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a control method, apparatus and computer readable storage medium for compressor overload protection, which can prevent the compressor from overload and ensure the compressor not to stop frequently.

The invention provides a method for overload protection of a compressor, which comprises the following steps: detecting the real-time temperature of the condenser, and comparing the detected real-time temperature with a temperature interval formed by a plurality of preset temperature thresholds; when the real-time temperature is in the A1 interval, controlling the compressor to operate according to a preset main control program; when the real-time temperature is in the interval A2, controlling the compressor to operate the frequency reduction regulation according to the frequency reduction instruction of the preset main control program; when the real-time temperature is in the interval A3, controlling the compressor to perform down-conversion adjustment at a preset frequency adjustment value; and when the real-time temperature is in the A4 interval, controlling the compressor to stop.

Preferably, when the real-time temperature is within the interval a3, the step of controlling the compressor to perform down-regulation at the preset frequency adjustment value includes: and when the real-time temperature is in the interval A31, controlling the compressor to perform down-regulation at the first frequency regulation value.

Preferably, the step of controlling the compressor to perform down-conversion regulation at the preset frequency regulation value when the real-time temperature is within the interval of a3 further includes: and when the real-time temperature is in the interval A32, controlling the compressor to perform down-conversion adjustment by a second frequency adjustment value, wherein the second frequency adjustment value is greater than the first frequency adjustment value.

Preferably, the first frequency is a fall Δ H1 cycles per Δ a time.

Preferably, the second frequency is a fall of Δ H2 cycles per Δ a time, Δ H1 < Δh 2.

The invention also provides a compressor control device comprising the compressor control method as claimed in the above claims.

The invention also provides a computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to the preceding claims.

Compared with the scheme in the prior art, the invention has the advantages that: the invention provides a method and a device for overload protection of a compressor and a computer readable storage medium, which can effectively judge the overload running state of the compressor, reduce the frequency of the compressor in stages, reduce the load in time, prevent the compressor from frequently stopping, reduce the loss of the compressor and achieve the purpose of prolonging the service life.

Drawings

The invention is further described with reference to the following figures and examples:

fig. 1 is a schematic flow chart illustrating a control method for overload protection of a compressor according to an embodiment of the present invention.

Fig. 2 is a schematic flow chart illustrating a control method for overload protection of a compressor according to another embodiment of the present invention.

Fig. 3 is a schematic diagram of a temperature range according to an embodiment of the invention.

Detailed Description

The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present invention. The conditions employed in the examples may be further adjusted as determined by the particular manufacturer, and the conditions not specified are typically those used in routine experimentation.

The present application proposes a method of overload protection of a compressor (also called a control method of overload protection of a compressor), the method comprising: detecting real-time temperature, and comparing the detected real-time temperature with a temperature interval formed by a plurality of preset temperature thresholds; when the real-time temperature is in the A1 interval, controlling the compressor to operate according to a preset main control program; when the real-time temperature is in the interval A2, controlling the compressor to operate the frequency reduction regulation according to the frequency reduction instruction of the preset main control program; when the real-time temperature is in the interval A3, controlling the compressor to perform down-conversion adjustment at a preset frequency adjustment value; when the real-time temperature is in the A4 interval, the compressor is controlled to stop, the compressor is subjected to down-conversion control based on different temperature division temperature intervals, the compressor is enabled to jump out of an overload running state through adjustment, the number of times of direct stop is reduced, and the normal service time of the compressor is prolonged.

Referring to fig. 1, the present invention provides a control method for overload protection of a compressor, which includes the following steps:

s10, detecting the real-time temperature, and comparing the detected real-time temperature with a temperature interval formed by a plurality of preset temperature thresholds; the condenser of the compressor is provided with the temperature sensor, and the temperature sensor is used for measuring the temperature value Tc in real time. A plurality of different temperature thresholds are preset in a program of the controller, a plurality of temperature intervals are formed by the temperature thresholds, and the controller judges the temperature interval to which the temperature Ac measured in real time belongs.

And S20, controlling the compressor to operate according to a preset main control program when the real-time temperature is in the A1 interval.

And S30, when the real-time temperature is in the A2 interval, controlling the compressor to operate the frequency reduction regulation according to the frequency reduction instruction of the preset main control program.

And S40, controlling the compressor to perform down-regulation at a preset frequency regulation value when the real-time temperature is in the A3 interval.

And S50, when the real-time temperature is in the A4 interval, controlling the compressor to stop.

In one embodiment of the present invention, referring to fig. 2, in step S40, when the real-time temperature is within the interval A3, the step of controlling the compressor to perform the down-regulation with the preset frequency adjustment value includes:

in step S41, when the real-time temperature is within the interval a31, the compressor is controlled to perform down-regulation with the first frequency adjustment value.

And step S42, when the real-time temperature is in the A32 interval, controlling the compressor to perform down-regulation by the second frequency regulation value. Wherein the second frequency adjustment value is greater than the first frequency adjustment value.

In the above embodiment, when the real-time temperature is in the interval a3, the compressor is controlled to perform the down-conversion adjustment step by step according to the preset first frequency adjustment value and the preset second frequency adjustment value, so as to prevent the compressor from being in an overload state, and ensure that the compressor does not stop frequently. In one embodiment of the present invention, when the real-time temperature is within the interval a3, a plurality of frequency adjustment values such as a third frequency adjustment value and a fourth frequency adjustment value may be further included, where the third frequency adjustment value is greater than the second frequency adjustment value, and the fourth frequency adjustment value is greater than the third frequency adjustment value, and the compressor is controlled to perform down-conversion adjustment according to the first frequency adjustment value, the second frequency adjustment value, the third frequency adjustment value, and the fourth frequency adjustment value, respectively, so as to prevent overload of the compressor and ensure that the compressor does not stop frequently.

In the following detailed description of the above embodiments, in one embodiment of the present invention, the controller is preset with a plurality of different temperature thresholds, such as T1, T2, T3, and T4, and the four temperatures are divided into 5 temperature intervals, as shown in fig. 3, the temperature is in an a1 interval when Tc is not greater than T4, in an a2 interval when T4 < Tc not greater than T3, in an A3 interval when T3 < Tc not greater than T2, in an a4 interval when T2 < Tc not greater than T1, and in an a5 interval when Tc > T1.

In the running process of the compressor, the controller compares the temperature Tc acquired in real time with the four temperature thresholds, confirms the temperature interval of the current compressor, and adjusts the temperature intervals as follows:

and when Tc is less than or equal to T4, judging that the current temperature Tc is in an A1 interval, and controlling the compressor to operate according to a main control program preset in the controller.

When T4 is more than Tc and less than or equal to T3, the current temperature Tc is judged to be in an A2 interval, the compressor is controlled to operate according to a main control program preset in the controller, but only the frequency reduction command is received in the A2 interval to carry out frequency reduction adjustment, and the frequency increase adjustment can be carried out without receiving the frequency increase command.

And when the T3 is more than Tc and less than or equal to T2, judging that the current temperature Tc is in an A3 interval, and controlling the compressor to perform down-frequency regulation according to a preset first frequency regulation value, wherein the preset first frequency regulation value is the frequency of delta H1 reduction every delta T time.

And when T2 is more than or equal to T1, judging that the current temperature Tc is in an A4 interval, and controlling the compressor to perform frequency reduction adjustment according to a preset second frequency adjustment value, wherein the preset second frequency adjustment value is the frequency of reducing delta H2 every delta T time, and is larger than the preset first frequency adjustment value, namely delta H1 is less than delta H2.

When Tc is more than T1, the current temperature Tc is judged to be in the A5 interval, and the compressor is controlled to stop immediately.

The invention relates to a control method for overload protection of a compressor, which detects real-time temperature through a temperature sensor, judges a temperature interval where the real-time temperature is located, and adopts different control modes according to different temperature intervals, wherein when the temperature is located in an A1 interval, the compressor is controlled to operate according to a preset main program, when the temperature is located in an A2 interval, the compressor is controlled to perform frequency reduction regulation according to a frequency reduction instruction of the preset main program, when the temperature is located in an A3 interval, the compressor is controlled to perform step-by-step frequency reduction regulation according to a preset frequency regulation value, when the real-time temperature is located in an A4 interval, the compressor is controlled to stop, the overload operation state of the compressor can be effectively judged, the compressor is subjected to frequency reduction in a step mode, the load is timely reduced, the compressor is prevented from being frequently stopped, the loss of the compressor.

The invention also provides a compressor control device which is used for executing the compressor control method comprising the above embodiments.

The present invention also provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the compressor control method described in the above embodiments.

The temperature sensor is arranged on the condenser, the compressor is subjected to frequency reduction control based on different temperature division temperature intervals according to a preset program, the compressor is enabled to jump out of an overload running state through adjustment, the number of times of direct shutdown is reduced, and the normal service time of the compressor is prolonged.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.