CN114413497B - Double-stage compressor, control method and device, control equipment and refrigeration equipment - Google Patents
Double-stage compressor, control method and device, control equipment and refrigeration equipment Download PDFInfo
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- CN114413497B CN114413497B CN202210010416.6A CN202210010416A CN114413497B CN 114413497 B CN114413497 B CN 114413497B CN 202210010416 A CN202210010416 A CN 202210010416A CN 114413497 B CN114413497 B CN 114413497B
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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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
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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 invention discloses a two-stage compressor, a control method and a control device, control equipment and refrigeration equipment, wherein the method comprises the steps of obtaining the intermediate pressure and the intermediate temperature of the two-stage compressor; determining a degree of subcooling based on the intermediate pressure and the intermediate temperature; and controlling the running state of the two-stage compressor according to the supercooling degree and the intermediate temperature. By applying the scheme of the invention, the intermediate pressure of the two-stage compressor is monitored through the pressure sensor, the intermediate temperature of the two-stage compressor is monitored through the temperature sensor, and then the supercooling degree is determined, the supercooling degree is used for reflecting the degree to which the refrigerating capacity of the high-temperature-stage compressor reaches, and when the low-temperature-stage compressor meets the starting condition, the low-temperature-stage compressor is started and runs under the working condition to meet the refrigerating requirement. And, by monitoring more factors related to the operation of the two-stage compressor, the reliability and stability of the operation of the two-stage compressor are also realized. Therefore, the scheme of the invention improves the running stability and reliability of the two-stage compressor and improves the product competitiveness of the two-stage compressor.
Description
Technical Field
The invention relates to the technical field of compressor control, in particular to a two-stage compressor, a control method and device, control equipment and refrigeration equipment.
Background
A two-stage compressor is a compressor with two stages of compression, and each stage has one or a plurality of cylinders. When the evaporating temperature of the refrigerating system is required to be controlled below minus 30 ℃ to minus 40 ℃, the compression ratio and the pressure difference of the single-stage compressor are limited to a certain extent. After the two-stage compressor and the low-temperature refrigerant are adopted, the evaporating temperature of minus 65 ℃ to minus 75 ℃ can be obtained. Thus, the dual stage compressor can be used in a low temperature cabinet and other low temperature devices.
In the current control of a two-stage compressor, the running state of the compressor is generally reflected based on the set temperature, the temperature in the tank and the time, and the control method of the two-stage compressor is an empirical mode obtained through long-term research and development, so that when a system running for a long time is changed, the current stability is broken, the reliability of the compressor cannot be completely ensured at the moment, and therefore, a scheme is needed to be proposed to improve the running reliability and stability of the two-stage compressor.
Disclosure of Invention
The invention aims to solve the technical problems that: the problem of the prior art is poor in operation reliability and unstable in operation when the control of the two-stage compressor is carried out through an empirical mode is solved.
In order to solve the technical problems, the invention provides a control method of a two-stage compressor, comprising the following steps:
acquiring the intermediate pressure and the intermediate temperature of the two-stage compressor;
determining a degree of subcooling based on the intermediate pressure and the intermediate temperature;
and controlling the operation state of the two-stage compressor according to the supercooling degree and the intermediate temperature.
Optionally, before the step of obtaining the intermediate pressure and the intermediate temperature of the two-stage compressor, the method further comprises:
acquiring the internal temperature of the refrigeration equipment;
judging whether the internal temperature reaches a first set temperature;
judging whether the shutdown time of the high-temperature-stage compressor reaches a first preset time period or not in response to the internal temperature reaching the first set temperature;
and responding to the stop time of the high-temperature-stage compressor reaching a first preset time, and starting the high-temperature-stage compressor to operate.
Optionally, said controlling the operating state of said two-stage compressor according to said degree of supercooling and said intermediate temperature comprises:
judging whether the intermediate temperature is less than or equal to a second set temperature;
and controlling an operation frequency of the high-temperature-stage compressor to be reduced based on the supercooling degree in response to the intermediate temperature being less than or equal to the second set temperature.
Optionally, the controlling the operation frequency reduction of the high temperature stage compressor based on the supercooling degree includes:
in response to the subcooling degree being greater than or equal to a first set value and less than a second set value, reducing the operating frequency of the high temperature stage compressor at a first set frequency reduction rate;
in response to the subcooling degree being less than a first set point, reducing the operating frequency of the high temperature stage compressor at a second set frequency reduction rate;
the first set frequency-reducing speed is smaller than the second set frequency-reducing speed.
Optionally, said controlling the operating state of said two-stage compressor according to said degree of supercooling and said intermediate temperature comprises:
judging whether the intermediate temperature is higher than a second set temperature;
and controlling an increase in the operating frequency of the high-temperature-stage compressor based on the supercooling degree in response to the intermediate temperature being greater than a second set temperature.
Optionally, the controlling the operation frequency of the high-temperature-stage compressor to increase based on the supercooling degree includes:
in response to the subcooling degree being greater than or equal to a third set value and less than a fourth set value, increasing the operating frequency of the high temperature stage compressor at a first set boost rate;
in response to the subcooling degree being greater than or equal to a fourth set value, increasing the operating frequency of the high temperature stage compressor at a second set boost rate;
Wherein the first set up-conversion speed is greater than the second set up-conversion speed.
Optionally, said controlling the operating state of said two-stage compressor according to said degree of supercooling and said intermediate temperature comprises:
judging whether the internal temperature of the refrigeration equipment is higher than the first set temperature or not in the running process of the high-temperature-stage compressor;
judging whether the operation time length of the high-temperature-stage compressor reaches a second preset time length or not in response to the internal temperature being greater than the first set temperature;
judging whether the supercooling degree is greater than or equal to a fifth set value or not in response to the operation time of the high-temperature-stage compressor reaching a second preset time;
and in response to whether the supercooling degree is greater than or equal to a fifth set value, starting the low temperature stage compressor.
Optionally, the controlling the operation state of the two-stage compressor according to the supercooling degree and the intermediate temperature further includes:
judging whether the internal temperature is higher than a third set temperature and lower than or equal to a fourth set temperature in the running process of the low-temperature-stage compressor;
in response to the internal temperature being greater than the third set temperature and less than or equal to the fourth set temperature, the low temperature stage compressor is operated at a current operating frequency.
Optionally, the controlling the operation state of the two-stage compressor according to the supercooling degree and the intermediate temperature further includes:
reducing the operating frequency of the low temperature stage compressor at a third set down-conversion rate in response to the internal temperature being less than or equal to the third set temperature;
and responsive to the internal temperature being greater than the fourth set temperature, increasing the operating frequency of the low temperature stage compressor at a fourth set ramp rate.
Optionally, the controlling the operation state of the two-stage compressor according to the supercooling degree and the intermediate temperature further includes:
judging whether the operation time of the low-temperature-stage compressor reaches a second set time;
and stopping the low-temperature-stage compressor and the high-temperature-stage compressor in response to the operation time of the low-temperature-stage compressor reaching a second set time.
In order to solve the above technical problems, the present invention provides a control device for a two-stage compressor, comprising:
the parameter acquisition module is used for acquiring the intermediate pressure and the intermediate temperature of the two-stage compressor;
a supercooling degree determination module for determining a supercooling degree based on the intermediate pressure and the intermediate temperature;
and the running state control module is used for controlling the running state of the two-stage compressor according to the supercooling degree and the intermediate temperature.
Optionally, the parameter obtaining module is further configured to obtain an internal temperature of the refrigeration device;
the running state control module is used for:
judging whether the internal temperature reaches a first set temperature; judging whether the shutdown time of the high-temperature-stage compressor reaches a first preset time period or not in response to the internal temperature reaching the first set temperature; and responding to the stop time of the high-temperature-stage compressor reaching a first preset time, and starting the high-temperature-stage compressor to operate.
Optionally, the operation state control module is configured to:
judging whether the intermediate temperature is less than or equal to a second set temperature;
and controlling an operation frequency of the high-temperature-stage compressor to be reduced based on the supercooling degree in response to the intermediate temperature being less than or equal to the second set temperature.
Optionally, the operation state control module is specifically configured to:
in response to the subcooling degree being greater than or equal to a first set value and less than a second set value, reducing the operating frequency of the high temperature stage compressor at a first set frequency reduction rate;
in response to the subcooling degree being less than a first set point, reducing the operating frequency of the high temperature stage compressor at a second set frequency reduction rate;
The first set frequency-reducing speed is smaller than the second set frequency-reducing speed.
Optionally, the operation state control module is specifically configured to:
judging whether the intermediate temperature is higher than a second set temperature;
and controlling an increase in the operating frequency of the high-temperature-stage compressor based on the supercooling degree in response to the intermediate temperature being greater than a second set temperature.
Optionally, the operation state control module is specifically configured to:
in response to the subcooling degree being greater than or equal to a third set value and less than a fourth set value, increasing the operating frequency of the high temperature stage compressor at a first set boost rate;
in response to the subcooling degree being greater than or equal to a fourth set value, increasing the operating frequency of the high temperature stage compressor at a second set boost rate;
wherein the first set up-conversion speed is greater than the second set up-conversion speed.
Optionally, the operation state control module is specifically configured to:
judging whether the internal temperature of the refrigeration equipment is higher than the first set temperature or not in the running process of the high-temperature-stage compressor;
judging whether the operation time length of the high-temperature-stage compressor reaches a second preset time length or not in response to the internal temperature being greater than the first set temperature;
Judging whether the supercooling degree is greater than or equal to a fifth set value or not in response to the operation time of the high-temperature-stage compressor reaching a second preset time;
and in response to whether the supercooling degree is greater than or equal to a fifth set value, starting the low temperature stage compressor.
Optionally, the operation state control module is specifically configured to:
judging whether the internal temperature is higher than a third set temperature and lower than or equal to a fourth set temperature in the running process of the low-temperature-stage compressor;
in response to the internal temperature being greater than the third set temperature and less than or equal to the fourth set temperature, the low temperature stage compressor is operated at a current operating frequency.
Optionally, the operation state control module is specifically configured to:
reducing the operating frequency of the low temperature stage compressor at a third set down-conversion rate in response to the internal temperature being less than or equal to the third set temperature;
and responsive to the internal temperature being greater than the fourth set temperature, increasing the operating frequency of the low temperature stage compressor at a fourth set ramp rate.
Optionally, the operation state control module is specifically configured to:
judging whether the operation time of the low-temperature-stage compressor reaches a second set time;
And stopping the low-temperature-stage compressor and the high-temperature-stage compressor in response to the operation time of the low-temperature-stage compressor reaching a second set time.
To solve the above technical problem, the present invention provides a control device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the above method when executing the computer program.
In order to solve the technical problems, the invention provides a two-stage compressor, which comprises the control equipment, a pressure sensor arranged at a condensing outlet of a condensing evaporator and a temperature sensor arranged at the condensing outlet of the condensing evaporator.
In order to solve the technical problems, the invention provides refrigeration equipment which comprises the two-stage compressor.
To solve the above technical problem, the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above method.
One or more embodiments of the above-described solution may have the following advantages or benefits compared to the prior art:
the two-stage compressor, the control method and the control device, the control equipment and the refrigeration equipment are applied to obtain the intermediate pressure and the intermediate temperature of the two-stage compressor; determining a degree of subcooling based on the intermediate pressure and the intermediate temperature; and controlling the operation state of the two-stage compressor according to the supercooling degree and the intermediate temperature. Because the starting performance and the running state of the two-stage compressor are closely related to the intermediate pressure and the intermediate temperature, the intermediate pressure of the two-stage compressor is monitored through the pressure sensor, the intermediate temperature of the two-stage compressor is monitored through the temperature sensor, and then the supercooling degree is determined, the supercooling degree is used for reflecting the degree to which the refrigerating capacity of the high-temperature-stage compressor reaches, and when the low-temperature-stage compressor meets the starting condition, the low-temperature-stage compressor is started and runs under the working condition to meet the refrigerating requirement. And, by monitoring more factors related to the operation of the two-stage compressor, the reliability and stability of the operation of the two-stage compressor are also realized. Therefore, the scheme of the invention improves the running stability and reliability of the two-stage compressor and improves the product competitiveness of the two-stage compressor.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a first flow chart of a control method for a dual stage compressor according to an embodiment of the present invention;
FIG. 2 is a second flow chart of a control method for a dual stage compressor according to an embodiment of the present invention;
FIG. 3 is a third flow chart of a control method for a dual stage compressor according to an embodiment of the present invention;
FIG. 4 is a fourth flow chart of a dual stage compressor control method according to an embodiment of the present invention;
FIG. 5 is a fifth flow chart of a control method for a dual stage compressor according to an embodiment of the present invention;
FIG. 6 is a block diagram of a dual stage compressor control device according to an embodiment of the present invention;
fig. 7 is a block diagram of a control apparatus provided by the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to solve the problems of poor operation reliability and unstable operation when the control of the two-stage compressor is performed in an empirical mode in the prior art, the embodiment of the invention provides a two-stage compressor, a control method and device, a control device and refrigeration equipment.
The control method of the two-stage compressor provided by the embodiment of the invention is described below.
Example 1
As shown in fig. 1, a first flowchart of a control method of a two-stage compressor according to an embodiment of the present invention may include the following steps:
step S101: the intermediate pressure and intermediate temperature of the two-stage compressor are obtained.
Step S102: a degree of subcooling is determined based on the intermediate pressure and the intermediate temperature.
In one implementation, when the intermediate pressure is in different intervals, different expressions are adopted to calculate the corresponding supercooling degree, and the supercooling degree can be determined according to the following expressions:
wherein P is x Is an intermediate pressure, T x Is an intermediate temperature.
In practical applications, the above expression may be obtained by fitting historical data of intermediate pressure, intermediate temperature and supercooling degree, and may be different for different refrigeration devices or different two-stage compressor expressions.
Step S103: and controlling the operation state of the two-stage compressor according to the supercooling degree and the intermediate temperature.
By applying the two-stage compressor and the control method, as the starting performance and the running state of the two-stage compressor are closely related to the intermediate pressure and the intermediate temperature, the intermediate pressure of the two-stage compressor is monitored through the pressure sensor, the intermediate temperature of the two-stage compressor is monitored through the temperature sensor, the supercooling degree is further determined, the supercooling degree is used for reflecting the degree to which the refrigerating capacity of the high-temperature-stage compressor reaches, and when the low-temperature-stage compressor meets the starting condition, the two-stage compressor is started and runs under the working condition to meet the refrigerating requirement. The scheme of the invention improves the running stability and reliability of the two-stage compressor and improves the product competitiveness of the two-stage compressor.
Example two
As shown in fig. 2, a second flowchart of a control method of a two-stage compressor according to an embodiment of the present invention may include the following steps:
step S201: the internal temperature of the refrigeration appliance is obtained.
Step S202: and judging whether the internal temperature reaches a first set temperature.
Step S203: and responding to the internal temperature reaching the first set temperature, and judging whether the shutdown time of the high-temperature-stage compressor reaches a first preset time.
When the power switch of the two-stage compressor is turned on, the high-temperature-stage compressor and the low-temperature-stage compressor are in a stop state; typically, the condensing fan is started after the power switch is turned on for a certain time, such as 1 min. Further, the temperature pulling stage is entered to judge the internal temperature T of the refrigeration equipment (such as a low-temperature preservation box) d And a first set temperature T s When T is the size of d ＜T s When the high-temperature-stage compressor and the low-temperature-stage compressor are in a stop state; when T is d ≥T s And judging the shutdown time of the high-temperature compressor, if the shutdown time is more than or equal to a first preset time, such as 3min, starting the high-temperature-stage compressor at an initial frequency f (f=33 Hz, for example), otherwise, maintaining shutdown.
Step S204: and responding to the stop time of the high-temperature-stage compressor reaching a first preset time, and starting the high-temperature-stage compressor to operate.
Step S205: the intermediate pressure and intermediate temperature of the two-stage compressor are obtained.
Step S206: a degree of subcooling is determined based on the intermediate pressure and the intermediate temperature.
Step S207: and controlling the operation state of the two-stage compressor according to the supercooling degree and the intermediate temperature.
Under the condition that the high-temperature-level compressor and the low-temperature-level compressor are in an operating state, judging whether the operating time of the low-temperature-level compressor reaches a second set time; and stopping the low-temperature-stage compressor and the high-temperature-stage compressor in response to the operation time of the low-temperature-stage compressor reaching a second set time. For example, if the internal temperature T during operation of the low-temperature stage compressor d ≤T s -a), the low-temperature stage compressor frequency is maintained unchanged, and when the low-temperature compressor is operated continuously for a period of time longer than a second set period of time T 2 (e.g., 5 minutes) at which time the low temperature stage compressor is shut down and the high temperature stage compressor is shut down.
It should be noted that the method embodiment shown in fig. 2 has all the advantages of the method embodiment shown in fig. 1, and in addition, in the method embodiment shown in fig. 2, whether to start the high-temperature-stage compressor is determined by the numerical relationship between the internal temperature of the refrigeration equipment and the first set temperature, so that the control of the high-temperature-stage compressor is optimized. Further, by judging whether the stop time of the high-temperature-stage compressor reaches a set value or not, the starting performance of the low-temperature-stage compressor can be ensured, the low-temperature-stage compressor is prevented from being started and stopped frequently, and the service life of the compressor is prolonged.
Example III
As shown in fig. 3, a third flowchart of a control method of a two-stage compressor according to an embodiment of the present invention may include, based on the method embodiment shown in fig. 2, the following steps:
step S301: the internal temperature of the refrigeration appliance is obtained.
Step S302: and judging whether the internal temperature reaches a first set temperature.
Step S303: and responding to the internal temperature reaching the first set temperature, and judging whether the shutdown time of the high-temperature-stage compressor reaches a first preset time.
Step S304: and responding to the stop time of the high-temperature-stage compressor reaching a first preset time, and starting the high-temperature-stage compressor to operate.
Step S305: the intermediate pressure and intermediate temperature of the two-stage compressor are obtained.
Step S306: a degree of subcooling is determined based on the intermediate pressure and the intermediate temperature.
It should be noted that, steps S301 to S306 in the method embodiment shown in fig. 3 are similar to steps S201 to S206 in the method embodiment shown in fig. 2, and are not repeated here.
Step S307: and judging whether the intermediate temperature is less than or equal to a second set temperature.
Step S308: and controlling an operation frequency of the high-temperature-stage compressor to be reduced based on the supercooling degree in response to the intermediate temperature being less than or equal to the second set temperature.
In one case, in response to the degree of subcooling being greater than or equal to a first set value and less than a second set value, reducing the operating frequency of the high temperature stage compressor at a first set frequency reduction rate; in response to the subcooling degree being less than a first set point, reducing the operating frequency of the high temperature stage compressor at a second set frequency reduction rate; in the case that the supercooling degree is greater than a second set value, the high-temperature-stage compressor is operated at a current frequency; the first set frequency-reducing speed is smaller than the second set frequency-reducing speed. Specifically, for a second set temperature of-35, an intermediate temperature T is obtained x When T x Judging the action of the high-temperature compressor according to the supercooling degree when the temperature is less than or equal to-35; if the supercooling degree is less than 1, and the running frequency of the high-temperature-stage compressor is greater than the target frequency, controlling the high-temperature-stage compressor to continuously reduce the frequency, wherein the reducing speed can be 1/30s Hz; if the supercooling degree is less than or equal to 1 and less than 5, and the running frequency of the high-temperature-stage compressor is greater than the target frequency, the high-temperature-stage compressor is controlled to continuously reduce the frequency, and the frequency reducing speed can be 1/60s Hz; otherwise, the compressor maintains the current frequency operation.
It should be noted that, in addition to all the advantages of the method embodiment shown in fig. 2, in the method embodiment shown in fig. 3, it is further provided that when the intermediate temperature is less than or equal to the second set temperature, the operating frequency of the high-temperature-stage compressor may be reduced according to the determined supercooling degree.
Example IV
As shown in fig. 4, a fourth flowchart of a control method of a two-stage compressor according to an embodiment of the present invention, based on the method embodiment shown in fig. 2, may include the following steps:
step S401: the internal temperature of the refrigeration appliance is obtained.
Step S402: and judging whether the internal temperature reaches a first set temperature.
Step S403: and responding to the internal temperature reaching the first set temperature, and judging whether the shutdown time of the high-temperature-stage compressor reaches a first preset time.
Step S404: and responding to the stop time of the high-temperature-stage compressor reaching a first preset time, and starting the high-temperature-stage compressor to operate.
Step S405: the intermediate pressure and intermediate temperature of the two-stage compressor are obtained.
Step S406: a degree of subcooling is determined based on the intermediate pressure and the intermediate temperature.
It should be noted that, steps S401 to S406 in the method embodiment shown in fig. 4 are similar to steps S201 to S206 in the method embodiment shown in fig. 2, and are not repeated here.
Step S407: and judging whether the intermediate temperature is higher than a second set temperature.
Step S408: and controlling an increase in the operating frequency of the high-temperature-stage compressor based on the supercooling degree in response to the intermediate temperature being greater than a second set temperature.
In one case, in response to the degree of supercooling being greater than or equal to a third set value and less than a fourth set value, increasing the operating frequency of the high temperature stage compressor at a first set rate of rise; in response to the subcooling degree being greater than or equal to a fourth set value, increasing the operating frequency of the high temperature stage compressor at a second set boost rate; in case that the supercooling degree is less than a third set value, the high temperature stage compressor is operated at a current frequency; wherein the first set up-conversion speed is greater than the second set up-conversion speed. In particular, the method comprises the steps of, Taking the second set temperature as-35, obtaining the intermediate temperature T x When T x Judging the action of the high-temperature compressor according to the supercooling degree when the temperature is > -35; when the supercooling degree is less than 1, the running frequency of the high-temperature-stage compressor is less than the target frequency, and the high-temperature-stage compressor is controlled to continuously raise the frequency, wherein the raising frequency speed can be 3/30s Hz; when the supercooling degree is less than or equal to 1 and less than 5, the running frequency of the high-temperature-stage compressor is less than the target frequency, and the continuous frequency rising of the high-temperature-stage compressor is controlled, wherein the frequency rising speed can be 1/60s Hz; when the supercooling degree is more than or equal to 5, the running frequency of the high-temperature-stage compressor is smaller than the target frequency, and the continuous frequency rising of the high-temperature-stage compressor is controlled, wherein the frequency rising speed is 1/60s Hz.
The third setting value in the fourth embodiment may be the same as or different from the first setting value in the third embodiment, and similarly, the fourth setting value in the fourth embodiment may be the same as or different from the second setting value in the third embodiment, where "first", "second", "third" and "fourth" are used only to distinguish physical quantities in different embodiments, and are not used to limit the numerical value of a specific physical quantity.
It should be noted that, in addition to all the advantages of the method embodiment shown in fig. 2, in the method embodiment shown in fig. 4, it is further provided that when the intermediate temperature is greater than the second set temperature, the operating frequency of the high-temperature-stage compressor may be reduced according to the determined supercooling degree.
Example five
As shown in fig. 5, a fifth flowchart of a control method of a two-stage compressor according to an embodiment of the present invention, based on the method embodiment shown in fig. 2, may include the following steps:
step S501: the internal temperature of the refrigeration appliance is obtained.
Step S502: and judging whether the internal temperature reaches a first set temperature.
Step S503: and responding to the internal temperature reaching the first set temperature, and judging whether the shutdown time of the high-temperature-stage compressor reaches a first preset time.
Step S504: and responding to the stop time of the high-temperature-stage compressor reaching a first preset time, and starting the high-temperature-stage compressor to operate.
Step S505: the intermediate pressure and intermediate temperature of the two-stage compressor are obtained.
Step S506: a degree of subcooling is determined based on the intermediate pressure and the intermediate temperature.
It should be noted that, steps S501 to S506 in the method embodiment shown in fig. 5 are similar to steps S201 to S206 in the method embodiment shown in fig. 2, and are not repeated here.
Step S507: and judging whether the internal temperature of the refrigeration equipment is higher than the first set temperature in the operation process of the high-temperature-stage compressor.
Step S508: and judging whether the operation duration of the high-temperature-stage compressor reaches a second preset duration or not in response to the internal temperature being greater than the first set temperature.
Step S509: and judging whether the supercooling degree is greater than or equal to a fifth set value or not in response to the operation time of the high-temperature-stage compressor reaching a second preset time.
Step S510: and in response to whether the supercooling degree is greater than or equal to a fifth set value, starting the low temperature stage compressor.
In one aspect, the controlling the operation state of the two-stage compressor according to the supercooling degree and the intermediate temperature further includes:
judging whether the internal temperature is higher than a third set temperature and lower than or equal to a fourth set temperature in the running process of the low-temperature-stage compressor; in response to the internal temperature being greater than the third set temperature and less than or equal to the fourth set temperature, the low temperature stage compressor is operated at a current operating frequency. Further, in response to the internal temperature being less than or equal to the third set temperature, reducing the operating frequency of the low temperature stage compressor at a third set down-conversion rate; and responsive to the internal temperature being greater than the fourth set temperature, increasing the operating frequency of the low temperature stage compressor at a fourth set ramp rate. For example, when the internal temperature T d ＜T s High temperature step pressureWhen the starting running time of the compressor is more than or equal to 30s and the current supercooling degree is more than or equal to 1, the low-temperature-stage compressor is started at the initial frequency f, otherwise, the low-temperature-stage compressor is kept in a stop state. During operation of the low-temperature-stage compressor, the internal temperature T d And a set temperature T s Judging the operation of the compressor if the internal temperature T d > third set temperature T s When the running frequency of the low-temperature-stage compressor is smaller than the target frequency, the low-temperature-stage compressor is controlled to continuously raise the frequency, and the raising speed is 3/30s Hz; if T d ≤T s -2, when the running frequency of the low-temperature-stage compressor is larger than the target frequency, controlling the low-temperature-stage compressor to continuously reduce the frequency, wherein the reducing speed is 1/30s hertz; otherwise, the compressor maintains the current frequency operation.
It should be noted that, the method embodiment shown in fig. 5 has all the beneficial effects of the method embodiment shown in fig. 2, in addition, a control strategy for starting the low-temperature-stage compressor is provided in the method embodiment shown in fig. 5, and the judgment of the running state of the low-temperature-stage compressor and the control process of the running state of the high-temperature-stage compressor are performed synchronously, in the running process of the high-temperature-stage compressor, whether to start the low-temperature-stage compressor is judged in real time, and in addition, the running state, such as the running time, of the high-temperature-stage compressor is combined when the low-temperature-stage compressor is started, so that the control strategy for the two-stage compressor is more consistent with the actual running situation, and the control is more accurate.
The following describes a control device for a two-stage compressor according to an embodiment of the present invention.
Example six
As shown in fig. 6, a block diagram of a control device for a two-stage compressor according to an embodiment of the present invention includes:
a parameter acquisition module 610 for acquiring an intermediate pressure and an intermediate temperature of the two-stage compressor;
a supercooling degree determination module 620 for determining a supercooling degree based on the intermediate pressure and the intermediate temperature;
an operating state control module 630 for controlling an operating state of the dual-stage compressor according to the supercooling degree and the intermediate temperature.
In one case, the parameter obtaining module 610 is further configured to obtain an internal temperature of the refrigeration device;
the running state control module 630 is configured to determine whether the internal temperature reaches a first set temperature; judging whether the shutdown time of the high-temperature-stage compressor reaches a first preset time period or not in response to the internal temperature reaching the first set temperature; and responding to the stop time of the high-temperature-stage compressor reaching a first preset time, and starting the high-temperature-stage compressor to operate.
Optionally, the running state control module 630 is configured to determine whether the intermediate temperature is less than or equal to a second set temperature; and controlling an operation frequency of the high-temperature-stage compressor to be reduced based on the supercooling degree in response to the intermediate temperature being less than or equal to the second set temperature.
Optionally, the operation state control module 630 is specifically configured to reduce the operation frequency of the high-temperature-stage compressor at a first set frequency-reducing speed in response to the supercooling degree being greater than or equal to a first set value and less than a second set value; in response to the subcooling degree being less than a first set point, reducing the operating frequency of the high temperature stage compressor at a second set frequency reduction rate; in the case that the supercooling degree is greater than a second set value, the high-temperature-stage compressor is operated at a current frequency; the first set frequency-reducing speed is smaller than the second set frequency-reducing speed.
Optionally, the running state control module 630 is specifically configured to determine whether the intermediate temperature is greater than a second set temperature; and controlling an increase in the operating frequency of the high-temperature-stage compressor based on the supercooling degree in response to the intermediate temperature being greater than a second set temperature.
Optionally, the operation state control module 630 is specifically configured to increase the operation frequency of the high-temperature-stage compressor at a first set frequency increasing speed in response to the supercooling degree being greater than or equal to a third set value and less than a fourth set value; in response to the subcooling degree being greater than or equal to a fourth set value, increasing the operating frequency of the high temperature stage compressor at a second set boost rate; in case that the supercooling degree is less than a third set value, the high temperature stage compressor is operated at a current frequency; wherein the first set up-conversion speed is greater than the second set up-conversion speed.
Optionally, the operation state control module 630 is specifically configured to determine, during operation of the high-temperature-stage compressor, whether the internal temperature of the refrigeration device is greater than the first set temperature; judging whether the operation time length of the high-temperature-stage compressor reaches a second preset time length or not in response to the internal temperature being greater than the first set temperature; judging whether the supercooling degree is greater than or equal to a fifth set value or not in response to the operation time of the high-temperature-stage compressor reaching a second preset time; and in response to whether the supercooling degree is greater than or equal to a fifth set value, starting the low temperature stage compressor.
Optionally, the operation state control module 630 is specifically configured to determine, during operation of the low-temperature stage compressor, whether the internal temperature is greater than a third set temperature and less than or equal to a fourth set temperature; in response to the internal temperature being greater than the third set temperature and less than or equal to the fourth set temperature, the low temperature stage compressor is operated at a current operating frequency.
Optionally, the operation state control module 630 is specifically configured to reduce the operation frequency of the low-temperature-stage compressor at a third set frequency-reducing speed in response to the internal temperature being less than or equal to the third set temperature; and responsive to the internal temperature being greater than the fourth set temperature, increasing the operating frequency of the low temperature stage compressor at a fourth set ramp rate.
Optionally, the operation state control module 630 is specifically configured to determine whether the operation duration of the low-temperature stage compressor reaches a second set duration; and stopping the low-temperature-stage compressor and the high-temperature-stage compressor in response to the operation time of the low-temperature-stage compressor reaching a second set time.
The control device of the two-stage compressor is applied to obtain the intermediate pressure and the intermediate temperature of the two-stage compressor; determining a degree of subcooling based on the intermediate pressure and the intermediate temperature; and controlling the operation state of the two-stage compressor according to the supercooling degree and the intermediate temperature. Because the starting performance and the running state of the two-stage compressor are closely related to the intermediate pressure and the intermediate temperature, the intermediate pressure of the two-stage compressor is monitored through the pressure sensor, the intermediate temperature of the two-stage compressor is monitored through the temperature sensor, and then the supercooling degree is determined, the supercooling degree is used for reflecting the degree to which the refrigerating capacity of the high-temperature-stage compressor reaches, and when the low-temperature-stage compressor meets the starting condition, the low-temperature-stage compressor is started and runs under the working condition to meet the refrigerating requirement. And, by monitoring more factors related to the operation of the two-stage compressor, the reliability and stability of the operation of the two-stage compressor are also realized. Therefore, the scheme of the invention improves the running stability and reliability of the two-stage compressor and improves the product competitiveness of the two-stage compressor.
Example seven
To solve the above technical problem, the present invention provides a control device, as shown in fig. 7, including a memory 710, a processor 720, and a computer program stored on the memory and executable on the processor, wherein the processor implements the method as described above when executing the computer program.
The control device can be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server and the like. The control device may include, but is not limited to, a processor 720, a memory 710. It will be appreciated by those skilled in the art that fig. 7 is merely an example of a control device and is not limiting of the control device, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the control device may also include an input-output device, a network access device, a bus, etc.
The processor 720 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 710 may be an internal storage unit of the control device, such as a hard disk or a memory of the control device. The memory 710 may also be an external storage device of the control device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the control device. Further, the memory 710 may also include both an internal storage unit and an external storage device of the control device. The memory 710 is used to store the computer program as well as other programs and data required by the control device. The memory 710 may also be used to temporarily store data that has been output or is to be output.
Example eight
In order to solve the technical problems, the invention provides a two-stage compressor, which comprises control equipment shown in fig. 7, a pressure sensor arranged at a condensing outlet of a condensing evaporator and a temperature sensor arranged at the condensing outlet of the condensing evaporator.
Further, the present invention provides a refrigeration apparatus comprising a dual stage compressor as described in embodiment eight. In practice, the refrigeration device may be, but is not limited to, a cryopreservation tank.
According to the two-stage compressor and the refrigeration equipment, the intermediate pressure of the two-stage compressor is monitored through the pressure sensor, the intermediate temperature of the two-stage compressor is monitored through the temperature sensor, so that the supercooling degree is determined, the supercooling degree is used for reflecting the degree to which the refrigerating capacity of the high-temperature-stage compressor reaches, and when the low-temperature-stage compressor meets the starting condition, the low-temperature-stage compressor is started and runs under the working condition to meet the refrigerating requirement. And, by monitoring more factors related to the operation of the two-stage compressor, the reliability and stability of the operation of the two-stage compressor are also realized. Therefore, the scheme of the invention improves the running stability and reliability of the two-stage compressor and improves the product competitiveness of the two-stage compressor and refrigeration equipment.
Example nine
The present application also provides a computer-readable storage medium, which may be a computer-readable storage medium contained in the memory in the above embodiments; or may be a computer readable storage medium alone that is not incorporated into the control device. The computer readable storage medium stores one or more computer programs which when executed by a processor implement the methods described above.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each method embodiment described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory 710, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier wave signal, a telecommunication signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
For system or apparatus embodiments, the description is relatively simple as it is substantially similar to method embodiments, with reference to the description of method embodiments in part.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
It is to be understood that the terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in this specification and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a condition or event is determined" or "if a condition or event is detected" may be interpreted in the context to mean "upon determination" or "in response to determination" or "upon detection of a condition or event, or" in response to detection of a condition or event.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (13)
1. A two-stage compressor control method, comprising:
acquiring the intermediate pressure and the intermediate temperature of the two-stage compressor;
Determining a degree of subcooling based on the intermediate pressure and the intermediate temperature;
controlling an operating state of the dual-stage compressor according to the supercooling degree and the intermediate temperature, comprising:
judging whether the intermediate temperature is less than or equal to a second set temperature;
controlling an operating frequency of the high-temperature-stage compressor to be reduced based on the supercooling degree in response to the intermediate temperature being less than or equal to the second set temperature;
the controlling of the operation frequency reduction of the high temperature stage compressor based on the supercooling degree includes:
in response to the subcooling degree being greater than or equal to a first set value and less than a second set value, reducing the operating frequency of the high temperature stage compressor at a first set frequency reduction rate;
in response to the subcooling degree being less than a first set point, reducing the operating frequency of the high temperature stage compressor at a second set frequency reduction rate;
the first set frequency-reducing speed is smaller than the second set frequency-reducing speed.
2. The two-stage compressor control method of claim 1, further comprising, prior to the acquiring the intermediate pressure and the intermediate temperature of the two-stage compressor:
acquiring the internal temperature of the refrigeration equipment;
judging whether the internal temperature reaches a first set temperature;
Judging whether the shutdown time of the high-temperature-stage compressor reaches a first preset time period or not in response to the internal temperature reaching the first set temperature;
and responding to the stop time of the high-temperature-stage compressor reaching a first preset time, and starting the high-temperature-stage compressor to operate.
3. The two-stage compressor control method according to claim 1, wherein the controlling the operating state of the two-stage compressor according to the supercooling degree and the intermediate temperature further comprises:
judging whether the intermediate temperature is higher than a second set temperature;
and controlling an increase in the operating frequency of the high-temperature-stage compressor based on the supercooling degree in response to the intermediate temperature being greater than a second set temperature.
4. The two-stage compressor control method according to claim 3, wherein the controlling the increase in the operating frequency of the high-temperature stage compressor based on the supercooling degree comprises:
in response to the subcooling degree being greater than or equal to a third set value and less than a fourth set value, increasing the operating frequency of the high temperature stage compressor at a first set boost rate;
in response to the subcooling degree being greater than or equal to a fourth set value, increasing the operating frequency of the high temperature stage compressor at a second set boost rate;
Wherein the first set up-conversion speed is greater than the second set up-conversion speed.
5. The two-stage compressor control method according to claim 2, wherein the controlling the operating state of the two-stage compressor according to the supercooling degree and the intermediate temperature includes:
judging whether the internal temperature of the refrigeration equipment is higher than the first set temperature or not in the running process of the high-temperature-stage compressor;
judging whether the operation time length of the high-temperature-stage compressor reaches a second preset time length or not in response to the internal temperature being greater than the first set temperature;
judging whether the supercooling degree is greater than or equal to a fifth set value or not in response to the operation time of the high-temperature-stage compressor reaching a second preset time;
and in response to whether the supercooling degree is greater than or equal to a fifth set value, starting the low temperature stage compressor.
6. The two-stage compressor control method according to claim 5, wherein the controlling the operating state of the two-stage compressor according to the supercooling degree and the intermediate temperature further comprises:
judging whether the internal temperature is higher than a third set temperature and lower than or equal to a fourth set temperature in the running process of the low-temperature-stage compressor;
In response to the internal temperature being greater than the third set temperature and less than or equal to the fourth set temperature, the low temperature stage compressor is operated at a current operating frequency.
7. The two-stage compressor control method according to claim 6, wherein the controlling the operating state of the two-stage compressor according to the supercooling degree and the intermediate temperature further comprises:
reducing the operating frequency of the low temperature stage compressor at a third set down-conversion rate in response to the internal temperature being less than or equal to the third set temperature;
and responsive to the internal temperature being greater than the fourth set temperature, increasing the operating frequency of the low temperature stage compressor at a fourth set ramp rate.
8. The two-stage compressor control method according to claim 6 or 7, characterized in that the controlling the operating state of the two-stage compressor according to the supercooling degree and the intermediate temperature further comprises:
judging whether the operation time of the low-temperature-stage compressor reaches a second set time;
and stopping the low-temperature-stage compressor and the high-temperature-stage compressor in response to the operation time of the low-temperature-stage compressor reaching a second set time.
9. A two-stage compressor control device, comprising:
The parameter acquisition module is used for acquiring the intermediate pressure and the intermediate temperature of the two-stage compressor;
a supercooling degree determination module for determining a supercooling degree based on the intermediate pressure and the intermediate temperature;
the running state control module is used for controlling the running state of the two-stage compressor according to the supercooling degree and the intermediate temperature;
the running state control module is used for:
judging whether the intermediate temperature is less than or equal to a second set temperature;
controlling an operating frequency of the high-temperature-stage compressor to be reduced based on the supercooling degree in response to the intermediate temperature being less than or equal to the second set temperature;
the running state control module is specifically configured to:
in response to the subcooling degree being greater than or equal to a first set value and less than a second set value, reducing the operating frequency of the high temperature stage compressor at a first set frequency reduction rate;
in response to the subcooling degree being less than a first set point, reducing the operating frequency of the high temperature stage compressor at a second set frequency reduction rate;
the first set frequency-reducing speed is smaller than the second set frequency-reducing speed.
10. A control device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method according to any one of claims 1 to 8 when executing the computer program.
11. A two-stage compressor comprising the control apparatus of claim 10, and a pressure sensor disposed at the condensing outlet of the condensing evaporator, and a temperature sensor disposed at the condensing outlet of the condensing evaporator.
12. A refrigeration apparatus comprising the dual stage compressor of claim 11.
13. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any one of claims 1 to 8.
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| JP6545448B2 (en) * | 2014-11-05 | 2019-07-17 | 三菱重工サーマルシステムズ株式会社 | Two-stage compression type refrigeration cycle apparatus, control apparatus and control method therefor |
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