CN113432353B - Compression ratio adjusting method, compression ratio adjusting device, compression ratio adjusting equipment and storage medium - Google Patents
Compression ratio adjusting method, compression ratio adjusting device, compression ratio adjusting equipment and storage medium Download PDFInfo
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- CN113432353B CN113432353B CN202110663655.7A CN202110663655A CN113432353B CN 113432353 B CN113432353 B CN 113432353B CN 202110663655 A CN202110663655 A CN 202110663655A CN 113432353 B CN113432353 B CN 113432353B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The embodiment of the invention discloses a compression ratio adjusting method, a compression ratio adjusting device, compression ratio adjusting equipment and a storage medium, wherein the compression ratio of a compressor and the duration time of the compression ratio are continuously obtained, when the compression ratio is continuously smaller than a first threshold value within first preset time, the step number of an electronic expansion valve is reduced, and the frequency of the compressor is increased until the compression ratio is larger than the first threshold value; when the compression ratio is continuously greater than the first threshold value and less than the second threshold value within a second preset time, reducing the step number of the electronic expansion valve, and increasing the frequency of the compressor until the compression ratio is greater than the second threshold value; and when the compression ratio is continuously greater than the second threshold value within the third preset time, adjusting the frequency of the compressor and the step number of the electronic expansion valve until the running state or the running mode of the compressor is changed. According to the embodiment of the invention, the step number of the electronic expansion valve and the frequency of the compressor are adjusted differently according to different compression ratios, so that the compression ratio is operated in a safe range, and the smooth oil return of the compressor is realized.
Description
Technical Field
The embodiment of the application relates to the field of compressors, in particular to a compression ratio adjusting method, a compression ratio adjusting device, compression ratio adjusting equipment and a storage medium.
Background
The compression ratio is the ratio of the discharge pressure and the suction pressure of the compressor, the discharge pressure and the suction pressure are determined by the operation condition of the refrigeration system, and the lower the evaporation temperature is, the lower the corresponding evaporation pressure is, and the lower the suction pressure of the compressor is; the higher the condensing temperature, the higher the corresponding condensing pressure, and the higher the discharge pressure of the compressor. In a refrigeration system, due to the reasons of limitation of operation conditions, mode switching, frequency control and the like, the conditions of low compression ratio often occur, namely, the condensation temperature is low and the evaporation temperature is high, and when the compression ratio of the refrigeration system is lower than a certain critical value, the compressor can generate obstacles in the oil return process, so that the internal structural components of the compressor are mechanically abraded, and even the compressor is damaged.
Disclosure of Invention
The embodiment of the invention provides a compression ratio adjusting method, a compression ratio adjusting device, compression ratio adjusting equipment and a storage medium, and solves the technical problem that in the prior art, when the compression ratio of a refrigerating system is lower than a certain critical value, a compressor generates obstacles in an oil return process, so that internal structural members of the compressor generate mechanical wear.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a compression ratio adjusting method, including the following steps:
continuously acquiring the compression ratio of the compressor and the duration of the compression ratio;
when the compression ratio is continuously smaller than a first threshold value within a first preset time, reducing the step number of the electronic expansion valve, and increasing the frequency of the compressor until the compression ratio is larger than the first threshold value;
when the compression ratio is continuously greater than the first threshold value and less than a second threshold value within a second preset time, reducing the step number of the electronic expansion valve, and increasing the frequency of the compressor until the compression ratio is greater than the second threshold value;
and when the compression ratio is continuously larger than the second threshold value within a third preset time, adjusting the frequency of the compressor and the step number of the electronic expansion valve until the running state or the running mode of the compressor is changed.
Preferably, the specific process of decreasing the number of steps of the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is greater than the first threshold value is as follows:
and reducing the step number of the electronic expansion valve at a first preset speed, and increasing the frequency of the compressor at a second preset speed until the compression ratio is greater than the first threshold value.
Preferably, the specific process of decreasing the number of steps of the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is greater than the second threshold value is as follows:
decreasing the number of steps of the electronic expansion valve at a third preset speed, and increasing the frequency of the compressor at a fourth preset speed until the compression ratio is greater than the second threshold value.
Preferably, the specific process of decreasing the number of steps of the electronic expansion valve at the first preset speed and increasing the frequency of the compressor at the second preset speed is as follows:
and reducing the step number N of the electronic expansion valve every time T, and increasing the frequency Mhz of the compressor every time T.
Preferably, the specific process of decreasing the number of steps of the electronic expansion valve at the third preset speed and increasing the frequency of the compressor at the fourth preset speed is as follows:
and reducing the step number N/2 of the electronic expansion valve every time T/2, and increasing the frequency M/2hz of the compressor every time T/2.
Preferably, before adjusting the frequency of the compressor when the compression ratio is continuously greater than the second threshold value within the third preset time, the method further includes the following steps:
and recording the first step number of the electronic expansion valve and the first frequency of the compressor at the moment.
Preferably, the specific process of adjusting the frequency of the compressor and adjusting the number of steps of the electronic expansion valve until the operating state or the operating mode of the compressor changes includes:
and adjusting the frequency of the compressor according to the actual energy requirement and the first step number, and adjusting the step number of the electronic expansion valve according to the return air superheat degree and the first frequency until the running state or running mode of the compressor is changed.
In a second aspect, an embodiment of the present invention further provides a compression ratio adjusting apparatus, including:
the data acquisition module is used for continuously acquiring the compression ratio of the compressor and the duration of the compression ratio;
the first control operation module is used for reducing the step number of the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is larger than a first threshold value when the compression ratio is continuously smaller than the first threshold value within a first preset time;
the second control operation module is used for reducing the step number of the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is larger than the second threshold value when the compression ratio is continuously larger than the first threshold value and smaller than the second threshold value within a second preset time;
and the third control operation module is used for adjusting the frequency of the compressor and adjusting the step number of the electronic expansion valve when the compression ratio is continuously larger than the second threshold value within a third preset time until the running state or the running mode of the compressor changes.
Preferably, the first control operation module is used for reducing the number of steps of the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is greater than the first threshold value by the specific process of: the method is used for reducing the step number of the electronic expansion valve at a first preset speed and increasing the frequency of the compressor at a second preset speed until the compression ratio is larger than a first threshold value.
Preferably, the second control operation module is used for reducing the number of steps of the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is greater than the second threshold value by the specific processes of: and the frequency of the compressor is increased at a fourth preset speed until the compression ratio is larger than a second threshold value.
Preferably, the first control operation module is specifically configured to decrease the number of steps of the electronic expansion valve at a first preset speed, and the specific process of increasing the frequency of the compressor at a second preset speed is as follows: and the frequency Mhz of the compressor is increased every time period T by reducing the step number N of the electronic expansion valve every time period T.
Preferably, the second control operation module is specifically configured to decrease the number of steps of the electronic expansion valve at a third preset speed, and the specific process of increasing the frequency of the compressor at a fourth preset speed is as follows: and the frequency M/2hz of the compressor is increased every time period T/2 by reducing the step number N/2 of the electronic expansion valve every time period T/2.
Preferably, the third control operation module further includes a recording sub-module, and the recording sub-module is configured to record the first step number of the electronic expansion valve and the first frequency of the compressor at this time before adjusting the frequency of the compressor when the compression ratio is continuously greater than the second threshold value within a third preset time.
Preferably, the third control operation module is configured to adjust the frequency of the compressor and adjust the number of steps of the electronic expansion valve until the operating state or the operating mode of the compressor changes in a specific process that: the frequency of the compressor is adjusted according to the actual energy requirement and the first frequency, and the step number of the electronic expansion valve is adjusted according to the return air superheat degree and the first frequency until the running state or the running mode of the compressor changes.
In a third aspect, an embodiment of the present invention further provides a compression ratio adjusting apparatus, including: one or more processors; storage means for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement the compression ratio adjustment method according to the first aspect.
In a fourth aspect, embodiments of the present invention also provide a storage medium storing computer-executable instructions, which when executed by a computer processor, are configured to perform the compression ratio adjustment method according to the first aspect.
In the embodiment of the invention, firstly, the compression ratio of the compressor and the duration time of the compression ratio are continuously acquired, and then, when the compression ratio is continuously smaller than a first threshold value within a first preset time, the step number of the electronic expansion valve is reduced, and the frequency of the compressor is increased until the compression ratio is larger than the first threshold value; when the compression ratio is continuously greater than the first threshold value and less than the second threshold value within a second preset time, reducing the step number of the electronic expansion valve, and increasing the frequency of the compressor until the compression ratio is greater than the second threshold value; and when the compression ratio is continuously greater than the second threshold value within the third preset time, adjusting the frequency of the compressor and the step number of the electronic expansion valve until the running state or the running mode of the compressor is changed. According to the embodiment of the invention, different control operations are executed according to different compression ratios, the compression ratio is enabled to operate in a relatively safe range by adjusting the step number of the electronic expansion valve and the frequency of the compressor, so that smooth oil return of the compressor is realized, mechanical abrasion of internal structural members of the compressor is avoided, and the safe operation and the service life of the compressor are ensured.
Drawings
Fig. 1 is a flowchart of a method for adjusting a compression ratio according to an embodiment of the present invention.
Fig. 2 is a flowchart of another method for adjusting compression ratio according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a compression ratio adjusting device according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a compression ratio adjusting apparatus according to an embodiment of the present invention.
Detailed Description
The following description and the annexed drawings set forth in detail certain illustrative embodiments of the application so as to enable those skilled in the art to practice them. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the present application includes the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the structures, products and the like disclosed in the embodiments, the description is simple because the structures, the products and the like correspond to the parts disclosed in the embodiments, and the relevant parts can be referred to the description of the method part.
The compression ratio adjusting method provided in the embodiment of the present application may be performed by a compression ratio adjusting apparatus, which may be implemented in a software and/or hardware manner, and the compression ratio adjusting apparatus may be formed by two or more physical entities, or may be formed by one physical entity.
Example one
Fig. 1 is a flowchart of a compression ratio adjustment method according to an embodiment of the present invention, where the embodiment is applicable to adjusting a compression ratio, and the method may be executed by a computing device, and specifically includes the following steps:
In the present embodiment, the compression ratio adjusting apparatus obtains the compression ratio of the compressor and the duration of each compression ratio without interruption, for example, if the compression ratio of the compressor is obtained to be 2, the duration of obtaining the compression ratio to be 2 is obtained. In this embodiment, the manner of obtaining the compression ratio and the duration of the compression ratio may be set according to actual needs, for example, a high pressure sensor and a low pressure sensor are installed on the compressor, the pressure value on the high pressure side of the compressor and the pressure value on the low pressure side of the compressor are respectively collected by the high pressure sensor and the low pressure sensor, and the compression ratio adjusting device calculates the compression ratio and the duration of the compression ratio of the compressor in real time by obtaining the pressure values collected by the high pressure sensor and the low pressure sensor.
And 102, when the compression ratio is continuously smaller than a first threshold value within a first preset time, reducing the number of steps of the electronic expansion valve, and increasing the frequency of the compressor until the compression ratio is larger than the first threshold value.
In this embodiment, the setting mode of the first threshold may be set according to actual needs, and in one embodiment, the critical value of the lowest compression ratio is set as the first threshold; in another embodiment, a target compression ratio and a return difference value are set in the compression ratio adjustment apparatus in advance, the target compression ratio being in the range of 1.8 to 2.5, and the return difference value being in the range of 0.1 to 0.5, and after the target compression ratio and the return difference value are determined, the difference between the target compression ratio and the return difference value is taken as the first threshold value.
In this embodiment, the first preset time may be set according to actual needs. Illustratively, the first preset time is set to 1 minute. In this embodiment, when the compression ratio continues to be smaller than the first threshold value within the first preset time, it is indicated that the compression ratio of the compressor is not operated within the safe range at this time, and it is necessary to increase the compression ratio of the compressor, therefore, the number of steps of the electronic expansion valve is decreased, so that the opening degree of the electronic expansion valve is decreased, and at the same time, the frequency of the compressor is increased, so that the compression ratio of the compressor is increased.
And 103, when the compression ratio is continuously greater than the first threshold value and less than the second threshold value within a second preset time, reducing the step number of the electronic expansion valve, and increasing the frequency of the compressor until the compression ratio is greater than the second threshold value.
In this embodiment, the setting manner of the second threshold may be set according to actual needs. For example, the target compression ratio and the return difference value are set in the compression ratio adjustment apparatus in advance, and the sum of the target compression ratio and the return difference value is taken as the second threshold value. In one embodiment, the time length of the first preset time and the time length of the second preset time may be set to be equal, for example, if the first preset time is set to 1 minute, the second preset time is also set to 1 minute.
In this embodiment, when the compression ratio is continuously greater than the first threshold value and less than the second threshold value within the second preset time, the number of steps of the electronic expansion valve is decreased, so that the opening degree of the electronic expansion valve is decreased, and at the same time, the frequency of the compressor is increased, so that the compression ratio of the compressor continues to be increased, and when the compression ratio is increased to be greater than the second threshold value, the adjustment of the compression ratio is stopped.
And 104, when the compression ratio is continuously greater than the second threshold value within the third preset time, adjusting the frequency of the compressor and the step number of the electronic expansion valve until the running state or the running mode of the compressor changes.
In one embodiment, the time length of the first preset time, the time length of the second preset time and the time length of the third preset time may be set to be equal, for example, if the first preset time is set to be 1 minute, the second preset time and the third preset time are also set to be 1 minute.
In this embodiment, when the compression ratio continues to be greater than the second threshold value for the third preset time, the frequency of the compressor is adjusted, and the number of steps of the electronic expansion valve is adjusted until the operating state or the operating mode of the compressor changes. In one embodiment, the operation state of the compressor comprises an operation environment temperature, an operation water temperature and an exhaust temperature, the frequency of the compressor is adjusted through a third control operation, the step number of the electronic expansion valve is adjusted, and the adjustment of the compression ratio is stopped until the operation environment temperature changes to +/-T1 (1-10) DEG C, the operation water temperature changes to +/-T2 (1-10) DEG C, the exhaust temperature changes to +/-T3 (1-10) DEG C or the operation mode changes.
Firstly, continuously acquiring the compression ratio of the compressor and the duration of the compression ratio, and then reducing the step number of the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is greater than a first threshold value when the compression ratio is continuously smaller than the first threshold value within a first preset time; when the compression ratio is continuously greater than the first threshold value and less than the second threshold value within a second preset time, reducing the step number of the electronic expansion valve, and increasing the frequency of the compressor until the compression ratio is greater than the second threshold value; and when the compression ratio is continuously greater than the second threshold value within the third preset time, adjusting the frequency of the compressor and the step number of the electronic expansion valve until the running state or the running mode of the compressor is changed. According to the embodiment of the invention, different control operations are executed according to different compression ratios, the compression ratio is enabled to operate in a relatively safe range by adjusting the step number of the electronic expansion valve and the frequency of the compressor, so that smooth oil return of the compressor is realized, mechanical abrasion of internal structural members of the compressor is avoided, and the safe operation and the service life of the compressor are ensured.
Example two
Fig. 2 is a flowchart of another compression ratio adjusting method according to an embodiment of the present invention, which specifically includes the following steps:
And 202, when the compression ratio is continuously smaller than a first threshold value within a first preset time, reducing the step number of the electronic expansion valve at a first preset speed, and increasing the frequency of the compressor at a second preset speed until the compression ratio is larger than the first threshold value.
In this embodiment, the first preset speed and the second preset speed are preset, and then the number of steps of the electronic expansion valve is decreased at the first preset speed, and the frequency of the compressor is increased at the second preset speed. It can be understood that in the present embodiment, the first preset speed and the second preset speed can be set according to actual needs, for example, in one embodiment, the first preset speed is set to decrease the number of steps of the electronic expansion valve by 1 step within 1 second, the second preset speed is set to increase the frequency of the compressor by 1hz within 1 second, after the setting is completed, when the compression ratio is adjusted, the number of steps of the electronic expansion valve is decreased by 1 step every 1 second, and the frequency of the compressor is increased by 1hz, so that the compression ratio is increased.
And 203, when the compression ratio is continuously greater than the first threshold value and less than the second threshold value within the second preset time, reducing the step number of the electronic expansion valve at a third preset speed, and increasing the frequency of the compressor at a fourth preset speed until the compression ratio is greater than the second threshold value.
In this embodiment, the third preset speed and the fourth preset speed are preset, and then the number of steps of the electronic expansion valve is decreased by the third preset speed, and the frequency of the compressor is increased by the fourth preset speed. It is understood that, in the present embodiment, the third preset speed and the fourth preset speed can be set according to actual requirements.
In one embodiment, the step number of the electronic expansion valve is decreased at a first preset speed, and the specific process of increasing the frequency of the compressor at a second preset speed is as follows: reducing the step number N of the electronic expansion valve every time T, and increasing the frequency Mhz of the compressor every time T; the specific process of reducing the step number of the electronic expansion valve at the third preset speed and increasing the frequency of the compressor at the fourth preset speed is as follows: and reducing the step number N/2 steps of the electronic expansion valve every time T/2, and increasing the frequency M/2hz of the compressor every time T/2. In one embodiment, T is in the range of (1S-60S), N is in the range of (1-20), and M is in the range of (1-10); illustratively, the number of steps of the electronic expansion valve is decreased by 6 steps every 30S and the frequency of the compressor is increased by 2hz every 30S during the execution of the first control operation, and the number of steps of the electronic expansion valve is decreased by 3 steps every 15S and the frequency of the compressor is increased by 1hz every 15S during the execution of the second control operation.
And 204, when the compression ratio is continuously larger than the second threshold value within the third preset time, recording the first step number of the electronic expansion valve and the first frequency of the compressor at the moment, adjusting the frequency of the compressor according to the actual energy requirement and the first step number, and adjusting the step number of the electronic expansion valve according to the return air superheat degree and the first frequency until the running state or the running mode of the compressor changes.
In this embodiment, when the compression ratio is continuously greater than the second threshold within the third preset time, the first step number of the electronic expansion valve and the first frequency of the compressor at this time need to be recorded, and the first step number and the first frequency are used as a step number protection value and a frequency protection value, in the subsequent compression ratio adjustment process, the frequency of the compressor must not be lower than the frequency protection value, and the step number of the electronic expansion valve must not be greater than the step number protection value. It can be understood that when the operation state or the operation mode of the compressor is changed, the step number protection value and the frequency protection value need to be readjusted to generate a new step number protection value and a new frequency protection value.
In this embodiment, the specific process of adjusting the frequency of the compressor according to the actual energy requirement and the first step number is as follows:
the method comprises the steps of obtaining the current inlet water temperature and the target inlet water temperature of the refrigeration system, calculating the absolute value of the difference value of the current inlet water temperature and the target inlet water temperature, adjusting the frequency of a compressor according to the absolute value, and limiting the frequency by a frequency protection value in the process of adjusting the frequency, wherein the frequency of the compressor is not lower than the frequency protection value, namely the first frequency. In the refrigeration system, | the current water inlet temperature of the system-the target water inlet temperature | is T, T and energy need to have a corresponding relation, and meanwhile, the magnitude of the frequency of the compressor can be determined by the magnitude of T, namely, the magnitude of T determines the frequency of the compressor, and on the basis, the frequency of the compressor can be adjusted according to T.
In this embodiment, the specific process of adjusting the number of steps of the electronic expansion valve according to the superheat degree of the returned air and the first frequency is as follows:
when the return air superheat degree is less than [ return air target superheat degree (1-10 ℃) to return difference value (1-5 ℃) ], the electronic expansion valve is turned off by M (1-30) steps at intervals of T (1-30 s) until the return air superheat degree is more than [ return air target superheat degree (1-10 ℃) to return difference value (1-5 ℃).
And when the [ target superheat degree of return gas (1-10 ℃) minus the return difference value (1-5 ℃) ] is less than or equal to the return superheat degree [ target superheat degree of return gas (1-10 ℃) plus the return difference value (1-5 ℃) ], the electronic expansion valve maintains the current step number without adjustment.
When the degree of superheat of the returned air is > [ the target degree of superheat (1-10 ℃) of the returned air + the return difference value (1-5 ℃) ], the electronic expansion valve is opened M (1-30) steps at intervals of time T (1-30 s) until the degree of superheat of the returned air is < [ the target degree of superheat (1-10 ℃) of the returned air + the return difference value (1-5 ℃) ].
It should be further noted that, when the number of steps of the electronic expansion valve is adjusted according to the degree of superheat of the return air, the number of steps of the electronic expansion valve cannot be greater than the number of steps protection value, i.e., the first number of steps, due to the limitation of the number of steps protection value.
Firstly, continuously acquiring the compression ratio of the compressor and the duration of the compression ratio, and then reducing the step number of the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is greater than a first threshold value when the compression ratio is continuously smaller than the first threshold value within a first preset time; when the compression ratio is continuously greater than the first threshold value and less than the second threshold value within a second preset time, reducing the step number of the electronic expansion valve, and increasing the frequency of the compressor until the compression ratio is greater than the second threshold value; and when the compression ratio is continuously greater than the second threshold value within the third preset time, adjusting the frequency of the compressor and the step number of the electronic expansion valve until the running state or the running mode of the compressor is changed. According to the embodiment of the invention, different control operations are executed according to different compression ratios, the compression ratio is enabled to operate in a relatively safe range by adjusting the step number of the electronic expansion valve and the frequency of the compressor, so that smooth oil return of the compressor is realized, mechanical abrasion of internal structural members of the compressor is avoided, and the safe operation and the service life of the compressor are ensured.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a compression ratio adjusting device according to an embodiment of the present invention, in this embodiment, the compression ratio adjusting device includes:
a data acquisition module 301, configured to continuously acquire a compression ratio of the compressor and a duration of the compression ratio;
and the first control operation module 302 is used for reducing the step number of the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is larger than the first threshold value when the compression ratio is continuously smaller than the first threshold value within the first preset time.
And a second control operation module 303, configured to decrease the number of steps of the electronic expansion valve and increase the frequency of the compressor until the compression ratio is greater than the second threshold when the compression ratio is continuously greater than the first threshold and less than the second threshold within a second preset time.
And a third control operation module 304, configured to adjust the frequency of the compressor and adjust the number of steps of the electronic expansion valve until the operation state or the operation mode of the compressor changes when the compression ratio is continuously greater than the second threshold value within a third preset time.
On the basis of the above embodiment, the specific process of the first control operation module 302 for decreasing the number of steps of the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is greater than the first threshold value is as follows: the frequency of the compressor is increased at a second preset speed until the compression ratio is larger than a first threshold value.
On the basis of the above embodiment, the specific process of the second control operation module 303 for decreasing the number of steps of the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is greater than the second threshold value is as follows: and the frequency of the compressor is increased at a fourth preset speed until the compression ratio is greater than a second threshold value.
On the basis of the above embodiment, the first control operation module 302 is specifically configured to decrease the number of steps of the electronic expansion valve at a first preset speed, and the specific process of increasing the frequency of the compressor at a second preset speed is as follows: and the frequency Mhz of the compressor is increased every time period T by reducing the step number N of the electronic expansion valve every time period T.
On the basis of the above embodiment, the second control operation module 303 is specifically configured to decrease the number of steps of the electronic expansion valve at the third preset speed, and the specific process of increasing the frequency of the compressor at the fourth preset speed is as follows: and the frequency M/2hz of the compressor is increased every time period T/2 by reducing the step number N/2 of the electronic expansion valve every time period T/2.
On the basis of the above embodiment, the third control operation module 304 further includes a recording sub-module, and the recording sub-module is configured to record the first step number of the electronic expansion valve and the first frequency of the compressor at this time before adjusting the frequency of the compressor when the compression ratio is continuously greater than the second threshold value within the third preset time.
On the basis of the above embodiment, the third control operation module 304 is configured to adjust the frequency of the compressor and adjust the number of steps of the electronic expansion valve until the operating state or the operating mode of the compressor changes, and the specific process includes: the frequency of the compressor is adjusted according to the actual energy requirement and the first frequency, and the step number of the electronic expansion valve is adjusted according to the return air superheat degree and the first frequency until the running state or the running mode of the compressor changes.
Example four
Fig. 4 is a schematic structural diagram of a compression ratio adjusting apparatus according to an embodiment of the present invention, as shown in fig. 4, the apparatus includes a processor 401, a memory 402, an input device 403, and an output device 404; the number of the processors 401 in the device may be one or more, and one processor 401 is taken as an example in fig. 4; the processor 401, the memory 402, the input device 403 and the output device 404 in the apparatus may be connected by a bus or other means, which is exemplified in fig. 4. The memory 402 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the compression ratio adjustment method in the embodiment of the present invention. The processor 401 executes various functional applications of the device and data processing by executing software programs, instructions and modules stored in the memory 402, that is, implements the compression ratio adjustment method described above. The input device 403 may be used to receive input numeric or character information and generate key signal inputs relating to user settings and function control of the apparatus. The output device 404 may include a display device such as a display screen.
EXAMPLE five
Embodiments of the present invention also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a compression ratio adjustment method, the method including:
continuously acquiring the compression ratio of the compressor and the duration of the compression ratio;
when the compression ratio is continuously smaller than a first threshold value within a first preset time, reducing the step number of the electronic expansion valve, and increasing the frequency of the compressor until the compression ratio is larger than the first threshold value;
when the compression ratio is continuously greater than the first threshold value and less than the second threshold value within a second preset time, reducing the step number of the electronic expansion valve, and increasing the frequency of the compressor until the compression ratio is greater than the second threshold value;
and when the compression ratio is continuously greater than the second threshold value within the third preset time, adjusting the frequency of the compressor and the step number of the electronic expansion valve until the running state or the running mode of the compressor is changed.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will appreciate that the embodiments of the present invention are not limited to the specific embodiments described herein, and that various obvious changes, adaptations, and substitutions are possible, without departing from the scope of the embodiments of the present invention. Therefore, although the embodiments of the present invention have been described in more detail through the above embodiments, the embodiments of the present invention are not limited to the above embodiments, and many other equivalent embodiments may be included without departing from the concept of the embodiments of the present invention, and the scope of the embodiments of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A method of adjusting a compression ratio, comprising the steps of:
continuously acquiring the compression ratio of the compressor and the duration of the compression ratio;
when the compression ratio is continuously smaller than a first threshold value within a first preset time, reducing the step number of the electronic expansion valve, and increasing the frequency of the compressor until the compression ratio is larger than the first threshold value;
when the compression ratio is continuously larger than the first threshold value and smaller than a second threshold value within a second preset time, reducing the step number of the electronic expansion valve, and increasing the frequency of the compressor until the compression ratio is larger than the second threshold value;
when the compression ratio is continuously larger than the second threshold value within a third preset time, adjusting the frequency of the compressor, and adjusting the step number of the electronic expansion valve until the running state or the running mode of the compressor changes;
when the compression ratio is continuously greater than the second threshold value within the third preset time, before adjusting the frequency of the compressor, the method further comprises the following steps:
recording the first step number of the electronic expansion valve and the first frequency of the compressor at the moment;
the specific process of adjusting the frequency of the compressor and the step number of the electronic expansion valve until the running state or the running mode of the compressor changes is as follows:
and adjusting the frequency of the compressor according to the actual energy requirement and the first step number, and adjusting the step number of the electronic expansion valve according to the return air superheat degree and the first frequency until the running state or the running mode of the compressor changes.
2. A compression ratio adjustment method according to claim 1, characterized in that the steps of reducing the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is greater than the first threshold value are carried out by:
and reducing the step number of the electronic expansion valve at a first preset speed, and increasing the frequency of the compressor at a second preset speed until the compression ratio is greater than the first threshold value.
3. A compression ratio adjustment method according to claim 1, characterized in that the steps of reducing the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is greater than the second threshold value are as follows:
decreasing the number of steps of the electronic expansion valve at a third preset speed, and increasing the frequency of the compressor at a fourth preset speed until the compression ratio is greater than the second threshold value.
4. A compression ratio adjustment method according to claim 2, characterized in that said step of reducing the electronic expansion valve at a first preset speed and said step of increasing the frequency of the compressor at a second preset speed are carried out by:
and reducing the step number N of the electronic expansion valve every time T, and increasing the frequency Mhz of the compressor every time T.
5. A compression ratio adjustment method according to claim 3, wherein said decreasing the number of steps of said electronic expansion valve at a third preset speed and increasing the frequency of said compressor at a fourth preset speed comprises:
and reducing the step number N/2 of the electronic expansion valve every time T/2, and increasing the frequency M/2hz of the compressor every time T/2.
6. A compression ratio adjustment apparatus, comprising:
the data acquisition module is used for continuously acquiring the compression ratio of the compressor and the duration of the compression ratio;
the first control operation module is used for reducing the step number of the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is larger than a first threshold value when the compression ratio is continuously smaller than the first threshold value within a first preset time;
the second control operation module is used for reducing the step number of the electronic expansion valve and increasing the frequency of the compressor until the compression ratio is larger than the second threshold value when the compression ratio is continuously larger than the first threshold value and smaller than the second threshold value within a second preset time;
the third control operation module is used for adjusting the frequency of the compressor and adjusting the step number of the electronic expansion valve when the compression ratio is continuously larger than the second threshold value within a third preset time until the running state or the running mode of the compressor changes;
the third control operation module further comprises a recording submodule, and the recording submodule is used for recording the first step number of the electronic expansion valve and the first frequency of the compressor at the moment before the frequency of the compressor is adjusted when the compression ratio is continuously larger than the second threshold value within the third preset time;
the third control operation module is used for adjusting the frequency of the compressor and adjusting the step number of the electronic expansion valve until the running state or running mode of the compressor changes, and the specific process comprises the following steps:
the frequency of the compressor is adjusted according to the actual energy demand and the first frequency, and the step number of the electronic expansion valve is adjusted according to the return air superheat degree and the first frequency until the running state or the running mode of the compressor changes.
7. A compression ratio adjustment apparatus, characterized in that the apparatus comprises: one or more processors; storage means for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to carry out the compression ratio adjustment method according to any one of claims 1 to 5.
8. A storage medium storing computer executable instructions for performing the method of adjusting a compression ratio according to any one of claims 1 to 5 when executed by a computer processor.
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| CN108224849B (en) * | 2017-12-28 | 2020-08-07 | 青岛海尔空调电子有限公司 | Oil return control method for air conditioner |
| CN108397375B (en) * | 2018-02-07 | 2019-12-20 | 广东美的暖通设备有限公司 | Compressor control method, air conditioner and storage medium |
| CN109945562A (en) * | 2019-01-30 | 2019-06-28 | 广东芬尼能源技术有限公司 | A kind of heat pump unit and its delivery temperature control method, device |
| CN110631234A (en) * | 2019-09-30 | 2019-12-31 | 广东美的暖通设备有限公司 | Control method of air conditioner operation frequency, air conditioner and computer readable storage medium |
| CN112664455B (en) * | 2019-10-15 | 2023-02-21 | 广东芬尼克兹节能设备有限公司 | Lubrication adjusting method and device for compressor, electronic equipment and storage medium |
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| JP2001074319A (en) * | 1999-09-01 | 2001-03-23 | Daikin Ind Ltd | Refrigerating system |
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