CN112065703A - Segmented control method and device for operating frequency of compressor - Google Patents
Segmented control method and device for operating frequency of compressor Download PDFInfo
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- CN112065703A CN112065703A CN202011049636.7A CN202011049636A CN112065703A CN 112065703 A CN112065703 A CN 112065703A CN 202011049636 A CN202011049636 A CN 202011049636A CN 112065703 A CN112065703 A CN 112065703A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The embodiment of the application discloses a sectional control method and device for the running frequency of a compressor. According to the technical scheme, the critical values of the plurality of environmental temperatures are preset, the environmental temperature ranges are determined according to the critical values, and the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the minimum high-temperature safe operation frequency of the compressor unit corresponding to different environmental temperature ranges are preset. And then, detecting the environmental temperature in real time, and correspondingly controlling the compressor unit to operate at a minimum low-temperature safe operation frequency, a minimum high-temperature safe operation frequency, a maximum safe operation frequency, a range between the minimum low-temperature safe operation frequency and the maximum safe operation frequency, and a range between the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on a comparison result of the critical value and the environmental temperature. By adopting the technical means, the safe operation frequency of the compressor unit is controlled in a segmented mode, and the operation safety of the compressor unit is guaranteed.
Description
Technical Field
The embodiment of the application relates to the technical field of compressors, in particular to a sectional control method and device for the operating frequency of a compressor.
Background
When the frequency of the traditional variable frequency compressor is adjusted at high or low ring temperature, the safety risk of the whole machine operation can be caused due to the conditions of over standard temperature of an electric appliance, sudden change of system pressure and the like. To avoid this, an experimental test is usually adopted to measure the corresponding safe operating frequency of the unit at high and low loop temperatures. When the loop temperature of the unit reaches the preset critical temperature value, the frequency is directly reduced to the safe operation frequency for operation. Thereby avoiding the operation safety risk of the down-conversion compressor under the condition of high ring temperature or low ring temperature.
However, although the safe operation requirement of the compressor is met to a certain extent through the direct frequency reduction control, part of capacity of the unit is sacrificed at the same time, so that the operation energy efficiency of the unit at the environment temperature is difficult to meet the requirement of a user. In addition, when the compressor runs at a high ambient temperature, the temperature rises due to continuous heating of the electrical appliance, and the safety risk of the electric control module and even the whole compressor is easily caused. And the adoption of the frequency reduction to control the temperature rise of the compressor makes the running current of the compressor larger, and the safe running of the unit is difficult to ensure.
Disclosure of Invention
The embodiment of the application provides a sectional control method and device for the running frequency of a compressor, which can guarantee the running safety through the regulation of the running frequency of the compressor, improve the running energy efficiency and avoid the running safety risk of the compressor under the condition of high or low ring temperature.
In a first aspect, an embodiment of the present application provides a method for controlling an operating frequency of a compressor in a segmented manner, including:
presetting a plurality of critical values of environment temperature, determining each environment temperature range according to the critical values, and presetting the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the minimum high-temperature safe operation frequency of the compressor unit corresponding to different environment temperature ranges;
detecting the environmental temperature in real time, and correspondingly controlling the compressor unit to operate between the minimum low-temperature safe operation frequency, the minimum high-temperature safe operation frequency, the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the maximum safe operation frequency, and between the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on the comparison result of the critical value and the environmental temperature.
Further, the critical value includes a first environment temperature value, a second environment temperature value, a third environment temperature value and a fourth environment temperature value which are sequentially increased;
correspondingly, detecting the environmental temperature in real time, and correspondingly controlling the compressor unit to operate between the minimum low-temperature safe operation frequency, the minimum high-temperature safe operation frequency, the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the maximum safe operation frequency, and the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on the comparison result between the critical value and the environmental temperature, including:
if the environment temperature is less than or equal to the first environment temperature value, controlling the compressor unit to operate at the minimum low-temperature safe operation frequency;
if the environment temperature is higher than the first environment temperature value and lower than or equal to the second environment temperature value, controlling the compressor unit to operate between the minimum low-temperature safe operation frequency and the maximum safe operation frequency;
if the environment temperature is higher than the second environment temperature value and lower than or equal to the third environment temperature value, controlling the compressor unit to operate at the maximum safe operation frequency;
if the environment temperature is higher than the third environment temperature value and lower than or equal to the fourth environment temperature value, controlling the compressor unit to operate between the maximum safe operation frequency and the minimum high-temperature safe operation frequency;
and if the environment temperature is higher than the fourth environment temperature value, controlling the compressor unit to operate at the minimum high-temperature safe operation frequency.
Further, if the ambient temperature is greater than the first ambient temperature value and less than or equal to the second ambient temperature value, the compressor unit is controlled to operate between the minimum low-temperature safe operation frequency and the maximum safe operation frequency, including:
determining a first slope for up-scaling between the minimum low temperature safe operating frequency and the maximum safe operating frequency based on the first ambient temperature value and the second ambient temperature value;
and calculating and adjusting the real-time running frequency of the compressor unit according to the environment temperature and the first slope.
Further, if the ambient temperature is greater than the third ambient temperature value and less than or equal to the fourth ambient temperature value, controlling the compressor unit to operate between the maximum safe operating frequency and the minimum high-temperature safe operating frequency, including:
determining a second slope of down regulation between the maximum safe operating frequency and the minimum high temperature safe operating frequency based on the third ambient temperature value and the fourth ambient temperature value;
and calculating and adjusting the real-time running frequency of the compressor unit according to the environment temperature and the second slope.
Further, the frequency values of the minimum low-temperature safe operation frequency, the minimum high-temperature safe operation frequency and the maximum safe operation frequency are sequentially increased.
Further, when detecting the ambient temperature in real time, and correspondingly controlling the compressor unit to operate between the minimum low-temperature safe operation frequency, the minimum high-temperature safe operation frequency, the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the maximum safe operation frequency, and the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on the comparison result between the critical value and the ambient temperature, the method further includes:
presetting sequentially increasing frequency limiting current, frequency reducing current and shutdown current of a compressor unit;
and detecting the running current of the compressor unit in real time, and correspondingly adjusting the running frequency of the compressor unit or performing shutdown protection on the compressor unit based on the result of the comparison between the running current and the frequency limiting current, the frequency reducing current or the shutdown current.
Further, adjusting the operating frequency of the compressor unit or performing shutdown protection on the compressor unit based on the result of the ratio of the operating current to the frequency limiting current, the frequency reducing current or the shutdown current comprises:
limiting the frequency increasing adjustment of the running frequency of the compressor unit if the running current reaches the frequency limiting current;
if the operating current reaches the frequency reduction current, continuously performing frequency reduction adjustment on the operating frequency of the compressor unit until the operating current reaches the frequency limiting current;
and if the running current reaches the shutdown current, performing shutdown protection on the compressor unit.
Further, the frequency limiting current, the frequency reducing current and the shutdown current are sequentially increased.
Further, the relationship formula between the frequency limiting current and the down-conversion current is as follows: a2 ═ a1 +. DELTA.a 1; the relation formula of the down-conversion current and the shutdown current is as follows: a3 ═ a2 +. DELTA.a 2;
a1 is the frequency limiting current, A2 is the down-conversion current, A3 is the stop current, and Δ A1 and Δ A2 are preset return current values.
In a second aspect, an embodiment of the present application provides a device for controlling an operating frequency of a compressor in stages, including:
the system comprises a setting module, a control module and a control module, wherein the setting module is used for presetting critical values of a plurality of environmental temperatures, determining each environmental temperature range according to the critical values, and presetting the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the minimum high-temperature safe operation frequency of a compressor unit corresponding to different environmental temperature ranges;
and the control module is used for detecting the ambient temperature in real time and correspondingly controlling the compressor unit to operate between the minimum low-temperature safe operation frequency, the minimum high-temperature safe operation frequency, the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the maximum safe operation frequency and between the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on the comparison result of the critical value and the ambient temperature.
In a third aspect, an embodiment of the present application provides an electronic device, including:
a memory and one or more processors;
the memory for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method of segmented control of the operating frequency of a compressor according to the first aspect.
In a fourth aspect, embodiments of the present application provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform the method for controlling the operating frequency of a compressor according to the first aspect in a stepwise manner.
According to the embodiment of the application, the critical values of a plurality of environmental temperatures are preset, each environmental temperature range is determined according to the critical values, and the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the minimum high-temperature safe operation frequency of the compressor unit corresponding to different environmental temperature ranges are preset. And then, detecting the environmental temperature in real time, and correspondingly controlling the compressor unit to operate at a minimum low-temperature safe operation frequency, a minimum high-temperature safe operation frequency, a maximum safe operation frequency, a range between the minimum low-temperature safe operation frequency and the maximum safe operation frequency, and a range between the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on a comparison result of the critical value and the environmental temperature. By adopting the technical means, the compressor unit is controlled to operate at the set maximum or minimum safe operation frequency in a segmented mode, so that the operation safety of the compressor unit is guaranteed, the operation energy efficiency is improved, and the operation safety risk of the compressor under the condition of high ring temperature or low ring temperature is avoided.
In addition, the running current of the compressor unit is controlled in a regulating and controlling process of the running frequency of the compressor unit, so that the situation that the running current is higher is avoided, and the safe running of the compressor is further guaranteed.
Drawings
FIG. 1 is a flow chart of a method for controlling the operating frequency of a compressor in stages according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of the adjustment between the minimum low-temperature safe operation frequency and the maximum safe operation frequency in the first embodiment of the present application;
FIG. 3 is a schematic diagram of a first slope according to an embodiment of the present disclosure;
FIG. 4 is a flowchart illustrating the adjustment between the maximum safe operating frequency and the minimum safe operating frequency at high temperature according to an embodiment of the present application;
FIG. 5 is a diagram illustrating a second slope according to a first embodiment of the present disclosure;
FIG. 6 is a flow chart of the operation current-based regulation according to the first embodiment of the present application;
fig. 7 is a schematic structural diagram of a sectional control device for an operating frequency of a compressor according to a second embodiment of the present application;
fig. 8 is a schematic structural diagram of an electronic device according to a third embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, specific embodiments of the present application will be described in detail with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some but not all of the relevant portions of the present application are shown in the drawings. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
The sectional control method for the running frequency of the compressor aims to ensure the safe running of the compressor by presetting the safe running frequency corresponding to different environmental temperature ranges of the compressor unit and subsequently determining the corresponding safe running frequency according to real-time environmental temperature comparison to perform sectional control and adjustment on the running frequency of the compressor unit. Compared with the traditional compressor, the air conditioning system has the advantages that the operation safety of the unit at high ambient temperature or low ambient temperature is guaranteed. The safe operating frequency of the compressor unit at high and low ambient temperatures is typically predetermined. And then, when the environment temperature of the unit is detected to reach a preset critical temperature value, the unit operation frequency is directly adjusted to the safe operation frequency for operation. The operation energy efficiency of the compressor is wasted to a certain extent due to the adjusting mode, so that the operation of the compressor at the environment temperature is difficult to meet the requirement of a user. Therefore, the sectional control method for the running frequency of the compressor provided by the embodiment of the application can improve the running energy efficiency of the compressor unit on the premise of ensuring the safe running of the compressor.
The first embodiment is as follows:
fig. 1 is a flowchart of a method for controlling an operating frequency of a compressor in stages according to an embodiment of the present invention, where the method for controlling an operating frequency of a compressor in stages provided in this embodiment may be implemented by a device for controlling an operating frequency of a compressor in stages, the device for controlling an operating frequency of a compressor in stages may be implemented by software and/or hardware, and the device for controlling an operating frequency of a compressor in stages may be formed by two or more physical entities or may be formed by one physical entity. Generally, the segmented control device of the compressor operation frequency can be a controller of the compressor, and the like.
The following description will be made taking a sectional control apparatus of the operating frequency of the compressor as an example of a main body of a sectional control method for performing the operating frequency of the compressor. Referring to fig. 1, the method for controlling the operating frequency of the compressor in sections specifically includes:
s110, presetting a plurality of critical values of the environmental temperature, determining each environmental temperature range according to the critical values, and presetting the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the minimum high-temperature safe operation frequency of the compressor unit corresponding to different environmental temperature ranges.
Specifically, based on a preset critical value of the environmental temperature, an experimental test of the safe operation frequency of the compressor unit is performed. The safe operation frequency of the compressor is detected in an environment temperature range formed by various environment temperature critical values, and then the maximum safe operation frequency H3 of the compressor unit operating at the proper environment temperature, the minimum low-temperature safe operation frequency H1 of the compressor unit operating in the low-temperature environment and the minimum high-temperature safe operation frequency H2 of the compressor unit operating in the high-temperature environment are determined. The minimum low-temperature safe operation frequency H1 is the minimum operation frequency of the compressor unit in the low-temperature environment; the minimum high-temperature safe operation frequency H2 is the minimum operation frequency of the compressor unit in the high-temperature environment; the maximum safe operation frequency H3 is the maximum safe operation frequency of the compressor at the optimum temperature. It should be noted that the suitable ambient temperature, the low-temperature environment and the high-temperature environment set the corresponding temperature ranges according to the actual operation requirements. The specific temperature range is not fixedly limited in the embodiments of the present application, and details are not repeated herein.
Further, the threshold values include a first ambient temperature value T1, a second ambient temperature value T2, a third ambient temperature value T3, and a fourth ambient temperature value T4, which are sequentially increased, i.e., T1 < T2 < T3 < T4. The four ambient temperature values are used for controlling the operating frequency of the compressor unit, and the ambient temperature ranges are different based on the four ambient temperature values, namely the ambient temperature range corresponding to the segmented control of the operating frequency of the compressor unit in the embodiment of the application.
And S120, detecting the ambient temperature in real time, and correspondingly controlling the compressor unit to operate between the minimum low-temperature safe operation frequency, the minimum high-temperature safe operation frequency, the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the maximum safe operation frequency, and the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on the comparison result of the critical value and the ambient temperature.
Further, after the critical value and each safe operation frequency are determined, the embodiment of the application compares the environmental temperature with the preset critical value by detecting the environmental temperature in real time, and then adjusts the operation frequency of the compressor based on the comparison result.
If the environment temperature is less than or equal to the first environment temperature value, controlling the compressor unit to operate at the minimum low-temperature safe operation frequency; if the environment temperature is higher than the first environment temperature value and lower than or equal to the second environment temperature value, controlling the compressor unit to operate between the minimum low-temperature safe operation frequency and the maximum safe operation frequency; if the environment temperature is higher than the second environment temperature value and lower than or equal to the third environment temperature value, controlling the compressor unit to operate at the maximum safe operation frequency; if the environment temperature is higher than the third environment temperature value and lower than or equal to the fourth environment temperature value, controlling the compressor unit to operate between the maximum safe operation frequency and the minimum high-temperature safe operation frequency; and if the environment temperature is higher than the fourth environment temperature value, controlling the compressor unit to operate at the minimum high-temperature safe operation frequency.
Specifically, the environment temperature detected in real time is defined as T0, when T0 is not more than T1, the current compressor unit is considered to be in low environment temperature operation, and the unit operation frequency is adjusted to maintain the operation at the minimum low-temperature safe operation frequency H1, so that the operation safety risk of the unit is avoided; when T1 is more than T0 and is not more than T2, the compressor is considered to operate between the low-temperature environment and the critical point of the proper temperature range, the compressor unit is controlled to operate between the minimum low-temperature safe operation frequency H1 and the maximum safe operation frequency H3, and the corresponding operation frequency is selected to operate in the operation frequency range according to different values of T0; when T2 is more than T0 and less than or equal to T3, the current compressor unit is considered to be in the suitable temperature range to operate, and the compressor unit is controlled to operate at the maximum safe operation frequency H3; when T3 is more than T0 and is not more than T4, the compressor is considered to operate between the critical point of the suitable temperature range and the high-temperature environment, and the compressor unit is controlled to operate between the maximum safe operation frequency H3 and the minimum high-temperature safe operation frequency H2; when T0 is greater than T4, the current compressor unit is considered to be in high ambient temperature operation, and the operation frequency of the unit is adjusted to maintain the minimum high-temperature safe operation frequency H2. It can be understood that, according to the different values of the ambient temperature T0, the compressor operation frequency is not directly adjusted to the corresponding safe operation frequency, but the compressor operation frequency is gradually adjusted according to the change of the temperature, so that the safe operation risk caused by the sudden change of the compressor operation frequency can be avoided. Thereby ensuring that the compressor operation frequency can be stably transited between H1 and H3 or between H2 and H3 at the safe operation frequency. As the temperature gradually increases from T0 to T4, the compressor operating frequency gradually increases from the minimum low temperature safe operating frequency H1 to the maximum safe operating frequency H3, and as the temperature further increases, the compressor operating frequency gradually decreases from the maximum safe operating frequency H3 to the minimum high temperature safe operating frequency H2, and the compressor is maintained to operate at the minimum high temperature safe operating frequency H2 when the compressor is operating at the predefined high ambient temperature (i.e., T4).
In the embodiment of the application, the frequency values of the minimum low-temperature safe operation frequency, the minimum high-temperature safe operation frequency and the maximum safe operation frequency are sequentially increased. Namely, the magnitude relation of the three safe operation frequencies is H3> H2> H1. By setting three safe operation frequencies, the compensation function of the environment temperature to the operation frequency of the compressor can be realized, and the output of the operation energy efficiency of the unit can be met to the greatest extent.
Specifically, referring to fig. 2, the adjustment process between the minimum low-temperature safe operation frequency and the maximum safe operation frequency includes:
s1201, determining a first slope for performing frequency-up adjustment between the minimum low-temperature safe operation frequency and the maximum safe operation frequency based on the first environment temperature value and the second environment temperature value;
and S1202, calculating and adjusting the real-time running frequency of the compressor unit according to the environment temperature and the first slope.
It can be understood that the ambient temperature of the compressor unit gradually increases from low temperature to a suitable temperature during the temperature increase from T1 to T2, and therefore, the operating frequency of the compressor is gradually increased during the process in order to improve the energy efficiency of the compressor as much as possible. Referring to fig. 3, when T1 and T2 are less than 0, and the temperature is increased from T1 to T2, the operation frequency of the compressor needs to be increased from the minimum low-temperature safe operation frequency H1 to the maximum safe operation frequency H3. Then based on the adjustment requirement, the slope K1 between the minimum low-temperature safe operation frequency H1 and the maximum safe operation frequency H3 corresponding to T1 and T2 at the moment is measured, and the slope is defined as a first slope K1. And when T1 is more than T0 and less than or equal to T2, multiplying the value of T0 by the first slope K1 to obtain the value of the running frequency of the compressor.
On the other hand, referring to fig. 4, the adjustment flow between the maximum safe operation frequency and the minimum high temperature safe operation frequency includes:
s1203, determining a second slope for performing frequency reduction adjustment between the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on the third environment temperature value and the fourth environment temperature value;
and S1204, calculating and adjusting the real-time running frequency of the compressor unit according to the environment temperature and the second slope.
Similarly, during the temperature ramp from T3 to T4, the compressor package is subjected to an ambient temperature ramp from a suitable temperature to a high temperature. Therefore, in this process, in order to improve the energy efficiency of the compressor as much as possible while avoiding the risk of safe operation of the compressor, the operating frequency of the compressor is gradually reduced. Referring to fig. 5, in the process of increasing the temperature from T3 to T4, the operation frequency of the compressor is gradually decreased from the maximum safe operation frequency H3 to the minimum high-temperature safe operation frequency H2. Then based on the adjustment requirement, the slope K2 between the maximum safe operation frequency H3 and the minimum high-temperature safe operation frequency H2 corresponding to T3 and T4 at the moment is measured, and the slope is defined as a second slope K2. And when T3 is more than T0 and less than or equal to T4, multiplying the value of T0 by the second slope K2 to obtain the value of the running frequency of the compressor.
It can be understood that, in the embodiment of the present application, by setting a plurality of temperature critical values and adaptively setting the safe operating frequency of the compressor corresponding to the temperature range formed by each temperature critical value, the operating frequency of the compressor can be adjusted and controlled in a segmented manner according to the change of the ambient temperature. The minimum safe operation frequency is set in a high-temperature or low-temperature environment, the maximum safe operation frequency is set in a proper temperature environment, the safe operation of the compressor can be guaranteed, the operation energy efficiency of the compressor can be ensured, and the phenomenon that the operation frequency of the compressor is too low to influence the output of the energy efficiency of the compressor is avoided. And calculating the slope of the slip frequency rising or frequency reduction according to the safety frequency preset corresponding to the two critical temperature values, and outputting the frequency value of the unit operation at the corresponding environmental temperature according to the current environmental temperature and the corresponding slope relation, so that the reliability and stability of frequency regulation can be ensured. And the running frequency of the compressor at different ring temperatures is accurately controlled, so that the unit can accurately adjust the running frequency of the compressor at each environment temperature, and the energy efficiency output required by a user is met while the safe running of the unit is ensured.
In addition, when the operation frequency of the compressor is adjusted, the frequency is adjusted by combining the real-time operation current of the compressor. Referring to fig. 6, the operation current-based adjustment process includes:
s121, presetting sequentially increasing frequency limiting current, frequency reducing current and stopping current of the compressor unit;
and S122, detecting the running current of the compressor unit in real time, and correspondingly adjusting the running frequency of the compressor unit or performing shutdown protection on the compressor unit based on the result of the ratio of the running current to the frequency limiting current, the frequency reducing current or the shutdown current.
Specifically, when the operating frequency of the compressor is adjusted, based on experimental tests, the frequency limiting current A1, the frequency reducing current A2 and the shutdown current A3 of the compressor unit are preset, and the operating current of the compressor unit is detected in real time, so that the unit is controlled to be increased or decreased in frequency or shutdown protection in combination with the adjustment of the unit frequency.
If the running current reaches the frequency limiting current, limiting the frequency increasing adjustment of the running frequency of the compressor unit; if the operating current reaches the frequency reduction current, continuously performing frequency reduction adjustment on the operating frequency of the compressor unit until the operating current reaches the frequency limiting current; and if the running current reaches the shutdown current, performing shutdown protection on the compressor unit.
The operation current is defined as A0, namely when A0 reaches A1, the operation frequency of the compressor unit is limited through the control of the frequency conversion plate, so that the compressor unit cannot continuously increase the frequency, and the safe operation risk of the compressor is avoided; when A0 reaches A2, the frequency conversion board controls the compressor to start to reduce the frequency until the unit operating current is A1; when A0 reaches A3, the frequency conversion board controls the forced shutdown protection of the compressor. The magnitude relation among the frequency limiting current A1, the down-conversion current A2 and the shutdown current A3 is A1< A2< A3. Wherein A2-A1 +. DELTA.A 1, A3-A2 +. DELTA.A 2; Δ a1 and Δ a2 are set return current values. By detecting the running current of the unit, combining with the frequency adjustment of the unit, the lifting frequency of the unit is controlled or the unit is shut down to protect, so that the safe running of the unit can be guaranteed while the capacity of the unit is realized to the maximum extent.
In the above, by presetting critical values of a plurality of ambient temperatures, each ambient temperature range is determined according to the critical values, and the maximum safe operating frequency, the minimum low-temperature safe operating frequency and the minimum high-temperature safe operating frequency of the compressor unit corresponding to different ambient temperature ranges are preset. And then, detecting the environmental temperature in real time, and correspondingly controlling the compressor unit to operate at a minimum low-temperature safe operation frequency, a minimum high-temperature safe operation frequency, a maximum safe operation frequency, a range between the minimum low-temperature safe operation frequency and the maximum safe operation frequency, and a range between the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on a comparison result of the critical value and the environmental temperature. By adopting the technical means, the compressor unit is controlled to operate at the set maximum or minimum safe operation frequency in a segmented mode, so that the operation safety of the compressor unit is guaranteed, the operation energy efficiency is improved, and the operation safety risk of the compressor under the condition of high ring temperature or low ring temperature is avoided. In addition, the running current of the compressor unit is controlled in a regulating and controlling process of the running frequency of the compressor unit, so that the situation that the running current is higher is avoided, and the safe running of the compressor is further guaranteed.
Example two:
on the basis of the above embodiments, fig. 7 is a schematic structural diagram of a sectional control device for an operating frequency of a compressor according to a second embodiment of the present application. Referring to fig. 7, the sectional control device for the operating frequency of the compressor provided in this embodiment specifically includes: a setting module 21 and a control module 22.
The setting module 21 is configured to preset threshold values of a plurality of environmental temperatures, determine each environmental temperature range according to the threshold values, and preset a maximum safe operating frequency, a minimum low-temperature safe operating frequency, and a minimum high-temperature safe operating frequency of the compressor unit corresponding to different environmental temperature ranges;
the control module 22 is configured to detect an ambient temperature in real time, and correspondingly control the compressor unit to operate between the minimum low-temperature safe operation frequency, the minimum high-temperature safe operation frequency, the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the maximum safe operation frequency, and between the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on a comparison result between the critical value and the ambient temperature.
In the above, by presetting critical values of a plurality of ambient temperatures, each ambient temperature range is determined according to the critical values, and the maximum safe operating frequency, the minimum low-temperature safe operating frequency and the minimum high-temperature safe operating frequency of the compressor unit corresponding to different ambient temperature ranges are preset. And then, detecting the environmental temperature in real time, and correspondingly controlling the compressor unit to operate at a minimum low-temperature safe operation frequency, a minimum high-temperature safe operation frequency, a maximum safe operation frequency, a range between the minimum low-temperature safe operation frequency and the maximum safe operation frequency, and a range between the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on a comparison result of the critical value and the environmental temperature. By adopting the technical means, the compressor unit is controlled to operate at the set maximum or minimum safe operation frequency in a segmented mode, so that the operation safety of the compressor unit is guaranteed, the operation energy efficiency is improved, and the operation safety risk of the compressor under the condition of high ring temperature or low ring temperature is avoided.
The sectional control device for the operating frequency of the compressor provided by the second embodiment of the present application can be used for executing the sectional control method for the operating frequency of the compressor provided by the first embodiment of the present application, and has corresponding functions and beneficial effects.
Example three:
an embodiment of the present application provides an electronic device, and with reference to fig. 8, the electronic device includes: a processor 31, a memory 32, a communication module 33, an input device 34, and an output device 35. The number of processors in the electronic device may be one or more, and the number of memories in the electronic device may be one or more. The processor, memory, communication module, input device, and output device of the electronic device may be connected by a bus or other means.
The memory 32 is a computer readable storage medium for storing software programs, computer executable programs, and modules, such as program instructions/modules corresponding to the method for controlling the operation frequency of the compressor according to any embodiment of the present application (for example, a setting module and a control module in the device for controlling the operation frequency of the compressor by stages). The memory can mainly comprise a program storage area and a data storage area, wherein the program storage area can store an operating system and an application program required by at least one function; the storage data area may store data created according to use of the device, and the like. Further, the memory may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory may further include memory located remotely from the processor, and these remote memories may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The communication module 33 is used for data transmission.
The processor 31 executes various functional applications of the device and data processing by executing software programs, instructions and modules stored in the memory, that is, implements the above-described sectional control method of the operating frequency of the compressor.
The input device 34 may be used to receive entered numeric or character information and to generate key signal inputs relating to user settings and function controls of the apparatus. The output device 35 may include a display device such as a display screen.
The electronic device provided above can be used to execute the method for controlling the operating frequency of the compressor in sections provided in the first embodiment above, and has corresponding functions and advantages.
Example four:
embodiments of the present application also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, perform a method for controlling an operating frequency of a compressor in stages, the method comprising: presetting a plurality of critical values of environment temperature, determining each environment temperature range according to the critical values, and presetting the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the minimum high-temperature safe operation frequency of the compressor unit corresponding to different environment temperature ranges; detecting the environmental temperature in real time, and correspondingly controlling the compressor unit to operate between the minimum low-temperature safe operation frequency, the minimum high-temperature safe operation frequency, the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the maximum safe operation frequency, and between the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on the comparison result of the critical value and the environmental temperature.
Storage medium-any of various types of memory devices or storage devices. The term "storage medium" is intended to include: mounting media such as CD-ROM, floppy disk, or tape devices; computer system memory or random access memory such as DRAM, DDR RAM, SRAM, EDO RAM, Lanbas (Rambus) RAM, etc.; non-volatile memory such as flash memory, magnetic media (e.g., hard disk or optical storage); registers or other similar types of memory elements, etc. The storage medium may also include other types of memory or combinations thereof. In addition, the storage medium may be located in a first computer system in which the program is executed, or may be located in a different second computer system connected to the first computer system through a network (such as the internet). The second computer system may provide program instructions to the first computer for execution. The term "storage medium" may include two or more storage media residing in different locations, e.g., in different computer systems connected by a network. The storage medium may store program instructions (e.g., embodied as a computer program) that are executable by one or more processors.
Of course, the storage medium provided in the embodiments of the present application contains computer-executable instructions, and the computer-executable instructions are not limited to the method for controlling the operating frequency of the compressor in stages as described above, and may also perform related operations in the method for controlling the operating frequency of the compressor in stages as provided in any of the embodiments of the present application.
The sectional control device, the storage medium and the electronic device for the operating frequency of the compressor provided in the above embodiments may perform the sectional control method for the operating frequency of the compressor provided in any embodiment of the present application, and refer to the sectional control method for the operating frequency of the compressor provided in any embodiment of the present application without detailed technical details described in the above embodiments.
The foregoing is considered as illustrative of the preferred embodiments of the invention and the technical principles employed. The present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the claims.
Claims (10)
1. A method for controlling an operating frequency of a compressor in stages, comprising:
presetting a plurality of critical values of environment temperature, determining each environment temperature range according to the critical values, and presetting the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the minimum high-temperature safe operation frequency of the compressor unit corresponding to different environment temperature ranges;
detecting the environmental temperature in real time, and correspondingly controlling the compressor unit to operate between the minimum low-temperature safe operation frequency, the minimum high-temperature safe operation frequency, the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the maximum safe operation frequency, and between the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on the comparison result of the critical value and the environmental temperature.
2. The sectional control method of an operating frequency of a compressor according to claim 1, wherein the critical value includes a first ambient temperature value, a second ambient temperature value, a third ambient temperature value, and a fourth ambient temperature value which are sequentially increased;
correspondingly, detecting the environmental temperature in real time, and correspondingly controlling the compressor unit to operate between the minimum low-temperature safe operation frequency, the minimum high-temperature safe operation frequency, the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the maximum safe operation frequency, and the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on the comparison result between the critical value and the environmental temperature, including:
if the environment temperature is less than or equal to the first environment temperature value, controlling the compressor unit to operate at the minimum low-temperature safe operation frequency;
if the environment temperature is higher than the first environment temperature value and lower than or equal to the second environment temperature value, controlling the compressor unit to operate between the minimum low-temperature safe operation frequency and the maximum safe operation frequency;
if the environment temperature is higher than the second environment temperature value and lower than or equal to the third environment temperature value, controlling the compressor unit to operate at the maximum safe operation frequency;
if the environment temperature is higher than the third environment temperature value and lower than or equal to the fourth environment temperature value, controlling the compressor unit to operate between the maximum safe operation frequency and the minimum high-temperature safe operation frequency;
and if the environment temperature is higher than the fourth environment temperature value, controlling the compressor unit to operate at the minimum high-temperature safe operation frequency.
3. The method of claim 2, wherein if the ambient temperature is greater than the first ambient temperature value and less than or equal to the second ambient temperature value, controlling the compressor unit to operate between the minimum low-temperature safe operation frequency and the maximum safe operation frequency comprises:
determining a first slope for up-scaling between the minimum low temperature safe operating frequency and the maximum safe operating frequency based on the first ambient temperature value and the second ambient temperature value;
and calculating and adjusting the real-time running frequency of the compressor unit according to the environment temperature and the first slope.
4. The method of claim 2, wherein if the ambient temperature is greater than the third ambient temperature value and less than or equal to the fourth ambient temperature value, controlling the compressor unit to operate between the maximum safe operating frequency and the minimum high-temperature safe operating frequency comprises:
determining a second slope of down regulation between the maximum safe operating frequency and the minimum high temperature safe operating frequency based on the third ambient temperature value and the fourth ambient temperature value;
and calculating and adjusting the real-time running frequency of the compressor unit according to the environment temperature and the second slope.
5. The method of controlling an operating frequency of a compressor in stages as claimed in claim 1, wherein frequency values of the minimum low temperature safe operating frequency, the minimum high temperature safe operating frequency and the maximum safe operating frequency are sequentially increased.
6. The sectional control method for the operating frequency of the compressor according to claim 1, wherein when detecting an ambient temperature in real time and correspondingly controlling the compressor unit to operate between the minimum low-temperature safe operating frequency, the minimum high-temperature safe operating frequency, the maximum safe operating frequency, the minimum low-temperature safe operating frequency and the maximum safe operating frequency, and the maximum safe operating frequency and the minimum high-temperature safe operating frequency based on a comparison result between the critical value and the ambient temperature, the method further comprises:
presetting sequentially increasing frequency limiting current, frequency reducing current and shutdown current of a compressor unit;
and detecting the running current of the compressor unit in real time, and correspondingly adjusting the running frequency of the compressor unit or performing shutdown protection on the compressor unit based on the result of the comparison between the running current and the frequency limiting current, the frequency reducing current or the shutdown current.
7. The method for controlling the operation frequency of the compressor according to claim 6, wherein the step of correspondingly adjusting the operation frequency of the compressor unit or performing shutdown protection on the compressor unit based on the ratio of the operation current to the frequency limiting current, the frequency reducing current or the shutdown current comprises:
limiting the frequency increasing adjustment of the running frequency of the compressor unit if the running current reaches the frequency limiting current;
if the operating current reaches the frequency reduction current, continuously performing frequency reduction adjustment on the operating frequency of the compressor unit until the operating current reaches the frequency limiting current;
and if the running current reaches the shutdown current, performing shutdown protection on the compressor unit.
8. The method of controlling an operating frequency of a compressor according to claim 6, wherein the frequency limiting current, the down-converting current and the stop current are sequentially increased.
9. The sectional control method for the operation frequency of the compressor according to claim 8, wherein the relation formula of the frequency limiting current and the frequency reducing current is: a2 ═ a1 +. DELTA.a 1; the relation formula of the down-conversion current and the shutdown current is as follows: a3 ═ a2 +. DELTA.a 2;
a1 is the frequency limiting current, A2 is the down-conversion current, A3 is the stop current, and Δ A1 and Δ A2 are preset return current values.
10. A device for controlling the operating frequency of a compressor in stages, comprising:
the system comprises a setting module, a control module and a control module, wherein the setting module is used for presetting critical values of a plurality of environmental temperatures, determining each environmental temperature range according to the critical values, and presetting the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the minimum high-temperature safe operation frequency of a compressor unit corresponding to different environmental temperature ranges;
and the control module is used for detecting the ambient temperature in real time and correspondingly controlling the compressor unit to operate between the minimum low-temperature safe operation frequency, the minimum high-temperature safe operation frequency, the maximum safe operation frequency, the minimum low-temperature safe operation frequency and the maximum safe operation frequency and between the maximum safe operation frequency and the minimum high-temperature safe operation frequency based on the comparison result of the critical value and the ambient temperature.
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