CN112361685A - Two-stage compressor control method, two-stage compressor refrigeration system and refrigeration equipment - Google Patents
Two-stage compressor control method, two-stage compressor refrigeration system and refrigeration equipment Download PDFInfo
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- CN112361685A CN112361685A CN202011467466.4A CN202011467466A CN112361685A CN 112361685 A CN112361685 A CN 112361685A CN 202011467466 A CN202011467466 A CN 202011467466A CN 112361685 A CN112361685 A CN 112361685A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 239000013589 supplement Substances 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 17
- 230000009977 dual effect Effects 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 230000008014 freezing Effects 0.000 description 7
- 238000007710 freezing Methods 0.000 description 7
- 239000003507 refrigerant Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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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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- 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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0253—Compressor control by controlling speed with variable speed
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
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- Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a control method of a two-stage compressor, a refrigeration system of the two-stage compressor and refrigeration equipment, wherein the control method of the two-stage compressor comprises the following steps: obtaining working parameters of a refrigerating system where the two-stage compressor is located, and determining the pressure requirement of the two-stage compressor according to the working parameters; detecting the actual pressure of the two-stage compressor; and judging whether the actual pressure meets the pressure requirement, and regulating the rotating speed of a low-pressure stage compressor and/or the rotating speed of a high-pressure stage compressor of the double-stage compressor according to the judgment result until the actual pressure meets the pressure requirement. The invention can accurately regulate and control the rotating speed of the high-pressure stage compressor and the low-pressure stage compressor of the two-stage compressor, and can meet the requirement that a refrigerating system can stably operate under different refrigerating requirements and working conditions.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a double-stage compressor control method for adjusting the rotating speed of a compressor, a double-stage compressor refrigeration system and refrigeration equipment.
Background
Refrigeration equipment is widely used in daily life, a refrigerator is the most common refrigeration equipment, most refrigerators with deep freezing functions in the market are single systems at present, the cold quantity requirements of a refrigerating chamber and a freezing chamber are met by controlling the frequency of a switch of an air door and a single-stage compressor, and the problems of insufficient deep freezing capacity, high energy consumption value, cold leakage of compartments and the like are often caused.
In the prior art, a two-stage compression refrigerator with a deep freezing function has appeared, the demand of the deep freezing function is achieved by regulating and controlling the air supply opening of a two-stage compressor or the on-off of the two-stage compressor, the pressure factor of the compressor is not considered in the regulation and control mode, uneven refrigerant flow distribution is easily caused by the pressure unbalance of each port of the two-stage compressor, and the operation reliability of the two-stage compressor is influenced.
Therefore, how to design a control method capable of ensuring the operation stability of the two-stage compressor in the regulation process is a technical problem to be solved urgently in the industry.
Disclosure of Invention
In order to overcome the defects of the regulation and control scheme of the conventional two-stage compression refrigerator, the invention provides a two-stage compressor control method, a two-stage compressor refrigeration system and refrigeration equipment.
The technical scheme adopted by the invention is that the control method for designing the two-stage compressor comprises the following steps:
obtaining working parameters of a refrigerating system where the two-stage compressor is located, and determining the pressure requirement of the two-stage compressor according to the working parameters;
detecting the actual pressure of the two-stage compressor;
and judging whether the actual pressure meets the pressure requirement, and regulating the rotating speed of a low-pressure stage compressor and/or the rotating speed of a high-pressure stage compressor of the double-stage compressor according to the judgment result until the actual pressure meets the pressure requirement.
Wherein, the working parameters include: at least one of a target temperature parameter reflecting a refrigeration demand and an actual temperature parameter reflecting an operating condition.
In one embodiment, the pressure requirements of the dual stage compressor include: the air suction pressure requirement of the low-pressure stage compressor, the exhaust pressure requirement of the high-pressure stage compressor and the air supply pressure requirement; the suction pressure requirement is that the actual suction pressure of the low-pressure stage compressor is lower than the upper limit value of the low pressure; the discharge pressure requirement is that the actual discharge pressure of the high-pressure stage compressor is lower than the high-pressure upper limit value; the air supply pressure requirement is that the actual air supply pressure of the high-pressure stage compressor reaches a preset value. The actual pressures of the two-stage compressor include: actual suction pressure of the low pressure stage compressor, actual discharge pressure of the high pressure stage compressor, and actual make-up pressure.
In this embodiment, determining the pressure requirement of the dual stage compressor based on the operating parameter comprises:
acquiring a corresponding low-pressure upper limit value, a corresponding high-pressure upper limit value and a corresponding preset value from a preset comparison relation between the working parameters and the pressure values according to the working parameters;
and respectively determining the suction pressure requirement, the exhaust pressure requirement and the air supply pressure requirement according to the acquired low-pressure upper limit value, high-pressure upper limit value and preset value.
In this embodiment, adjusting the low-pressure stage compressor speed and/or the high-pressure stage compressor speed of the two-stage compressor according to the determination result includes:
when the actual suction pressure does not meet the suction pressure requirement, the rotating speed of the low-pressure stage compressor is increased;
when the actual exhaust pressure does not meet the exhaust pressure requirement, reducing the rotating speed of the high-pressure stage compressor;
and when the actual air supplement pressure does not meet the air supplement pressure requirement, if the actual air supplement pressure is higher than a preset value, increasing the rotating speed of the high-pressure stage compressor and/or decreasing the rotating speed of the low-pressure stage compressor, and if the actual air supplement pressure is lower than the preset value, decreasing the rotating speed of the high-pressure stage compressor and/or increasing the rotating speed of the low-pressure stage compressor.
Preferably, the judging whether the actual pressure satisfies the pressure requirement includes:
firstly, judging whether the actual suction pressure meets the suction pressure requirement, and adjusting the rotating speed of the low-pressure stage compressor according to the judgment result until the actual suction pressure meets the suction pressure requirement;
judging whether the actual exhaust pressure meets the exhaust pressure requirement, and regulating the rotating speed of the high-pressure stage compressor according to the judgment result until the actual exhaust pressure meets the exhaust pressure requirement;
and finally, judging whether the actual air supply pressure meets the air supply pressure requirement or not, and regulating the rotating speed of the high-pressure stage compressor and/or the low-pressure stage compressor according to the judgment result until the actual air supply pressure meets the air supply pressure requirement.
Preferably, when the actual make-up pressure does not meet the make-up pressure requirement, the judgment of whether the actual pressure meets the pressure requirement is restarted after the rotating speed of the high-pressure stage compressor and/or the low-pressure stage compressor is adjusted.
The invention also proposes a two-stage compressor refrigeration system comprising: the system comprises a refrigeration loop with a two-stage compressor, a control module for controlling the working state of the two-stage compressor, and a detection module for detecting the actual pressure of the two-stage compressor, wherein the two-stage compressor consists of a low-pressure stage compressor and a high-pressure stage compressor; the control module obtains working parameters of a refrigeration system where the control module is located, determines pressure requirements of the two-stage compressor, and adjusts the rotating speed of the low-pressure stage compressor and/or the rotating speed of the high-pressure stage compressor according to the pressure requirements until actual pressure meets the pressure requirements.
Wherein, the detection module includes: the system comprises a first detection device for detecting the actual suction pressure of the low-pressure stage compressor, a second detection device for detecting the actual exhaust pressure of the high-pressure stage compressor, and a third detection device for detecting the actual air supplement pressure of the high-pressure stage compressor.
The invention also provides refrigeration equipment adopting the double-stage compressor refrigeration system, and the refrigeration equipment can be a refrigerator.
Compared with the prior art, the invention has the following technical effects:
1. the rotating speeds of the high-pressure stage compressor and the low-pressure stage compressor can be automatically controlled according to the pressure requirement, and the continuous and stable operation of a refrigerating system is guaranteed;
2. the rotating speeds of the high-pressure stage compressor and the low-pressure stage compressor are controlled to balance the pressure of each port of the two-stage compressor, so that the phenomenon of air suction and liquid carrying of the compressor can be prevented on the premise of sufficient air supplement, and the running reliability of the compressor is guaranteed.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic diagram of the connection of a two-stage compressor refrigeration system according to the present invention;
fig. 2 is a schematic diagram of the determination process in the preferred embodiment of the present invention.
Detailed Description
As shown in fig. 1, the two-stage compressor refrigeration system provided by the present invention is suitable for a refrigeration device, and includes a refrigeration loop, a detection module and a control module, the refrigeration loop is formed by sequentially connecting a two-stage compressor, a condenser 3, a one-stage throttling element 6, a first evaporator 7, a flash tank 8, a second evaporator 11 and a liquid storage tank 13, a refrigerant circulates in the refrigeration loop, the two-stage compressor is composed of a low-pressure stage compressor 2 and a high-pressure stage compressor 3, the low-pressure stage compressor 2 and the high-pressure stage compressor 3 employ a reciprocating compressor, an outlet of the first evaporator 7 is connected to an inlet of the flash tank 8, the one-stage throttling element 6 is disposed at an inlet of the first evaporator, an outlet of the flash tank 8 is connected to an air supplement port of the two-stage compressor, an inlet of the second evaporator 11 is connected to a liquid outlet of the flash tank 8 via, and an air outlet of the flash tank 8 is used for supplying air to the double-stage compressor.
The detection module is used for detecting the actual pressure of the double-stage compressor, the control module obtains the working parameters of the refrigerating system where the control module is located and determines the pressure requirement of the double-stage compressor, the received actual pressure is compared with the pressure requirement, and the rotating speed of the low-pressure-stage compressor and/or the rotating speed of the high-pressure-stage compressor are/is adjusted according to the comparison result until the actual pressure meets the pressure requirement, so that the continuous and stable operation of the refrigerating system is guaranteed. In a preferred embodiment provided by the present invention, the detection module comprises: the device comprises a first detection device 13 for detecting the actual suction pressure of the low-pressure stage compressor 1, a second detection device 14 for detecting the actual discharge pressure of the high-pressure stage compressor 2, and a third detection device 9 for detecting the actual air supply pressure of the high-pressure stage compressor, wherein the detection devices can adopt pressure valves.
Specifically, the control module performs the following control method.
The working parameters comprise at least one of target temperature parameters reflecting refrigeration requirements and actual temperature parameters reflecting working conditions, wherein the target temperature parameters refer to the target temperature of a compartment where an evaporator in the refrigeration circuit is located, and the actual temperature parameters refer to condensation temperature, evaporation temperature, suction temperature, exhaust temperature and the like of the refrigeration circuit. The pressure requirement changes along with the change of the working parameters, taking the working parameters as target temperature parameters reflecting the refrigeration requirement as an example, when the target temperature parameters change, the pressure requirement should be adjusted to be matched with the changed target temperature parameters so as to ensure the reliability of the double-stage compressor in the regulation and control process of the refrigeration loop.
And 2, detecting the actual pressure of the double-stage compressor.
And 3, judging whether the actual pressure meets the pressure requirement, and regulating the rotating speed of the low-pressure stage compressor 2 and/or the rotating speed of the high-pressure stage compressor 3 of the double-stage compressor according to the judgment result until the actual pressure meets the pressure requirement.
In the preferred embodiment provided by the present invention, the pressure requirement includes a suction pressure requirement of the low-pressure stage compressor 1, a discharge pressure requirement of the high-pressure stage compressor 2, and a pressure compensation pressure requirement, the suction pressure requirement is that an actual suction pressure of the low-pressure stage compressor 1 is lower than a low upper limit value, the discharge pressure requirement is that an actual discharge pressure of the high-pressure stage compressor 2 is lower than a high upper limit value, the pressure compensation requirement is that an actual pressure compensation of the high-pressure stage compressor 2 reaches a preset value, and the actual pressure of the two-stage compressor includes an actual suction pressure of the low-pressure stage compressor 1, an actual discharge pressure of the high-pressure stage compressor.
The mode of determining the pressure requirement of the double-stage compressor according to the working parameters in the step 1 is as follows: and acquiring a corresponding low-pressure upper limit value, a corresponding high-pressure upper limit value and a corresponding preset value from a preset comparison relation between the working parameters and the pressure values, taking the acquired low-pressure upper limit value as a low-pressure upper limit value in the suction pressure requirement to determine the suction pressure requirement, taking the acquired high-pressure upper limit value as a high-pressure upper limit value in the exhaust pressure requirement to determine the exhaust pressure requirement, and taking the acquired preset value as a preset value in the air supplement pressure requirement to determine the air supplement pressure requirement. The design mode of the comparison relationship between the working parameters and the pressure values is various, and can be selected according to the actual condition of the refrigeration system, taking the working parameters as target temperature parameters reflecting refrigeration requirements as an example, the low-pressure upper limit value, the high-pressure upper limit value and the preset value corresponding to different target temperature parameters are obtained through multiple times of experimental sampling, the comparison relationship between the target temperature parameters and the pressure values is obtained through statistics of multiple groups of sampling data, the comparison relationship can be a functional relation obtained through fitting of multiple sampling points, and can also be a comparison table obtained through dividing the target temperature parameters into intervals and designing the corresponding pressure values according to the intervals.
In the step 3, the rotating speed of the low-pressure stage compressor and/or the rotating speed of the high-pressure stage compressor of the two-stage compressor are/is adjusted according to the judgment result in the following modes:
when the actual suction pressure does not meet the suction pressure requirement, the rotating speed of the low-pressure stage compressor 1 is increased, the adjustment has the effect of preventing the suction pressure from being overhigh, when the rotating speed of the low-pressure stage compressor 1 is overlow, most of refrigerants can enter the high-pressure stage compressor 2 from the air supplementing port, the superheat degree of an evaporator is overlarge, the suction pressure is correspondingly increased, and the system pressure is unbalanced;
when the actual exhaust pressure does not meet the exhaust pressure requirement, the rotating speed of the high-pressure stage compressor 2 is reduced, and the regulation has the function of preventing the high-pressure stage compressor 2 from rotating at an overhigh rotating speed, the exhaust pressure is overlarge and further the suction pressure is overlow, so that most of the refrigerant enters the high-pressure stage compressor 2 from the air supplementing port to cause the system pressure unbalance;
when the actual air supply pressure does not meet the air supply pressure requirement, if the actual air supply pressure is higher than a preset value, the rotating speed of the high-pressure stage compressor 2 is increased and/or the rotating speed of the low-pressure stage compressor 1 is reduced, and if the actual air supply pressure is lower than the preset value, the rotating speed of the high-pressure stage compressor 2 is reduced and/or the rotating speed of the low-pressure stage compressor 1 is increased.
It should be noted that the adjustment mode of the rotation speed may be adjusted by using a fixed rotation speed difference, that is, the set rotation speed is increased or decreased each time, for example, the current rotation speed of the compressor is 1500rpm, when the rotation speed needs to be increased, the set rotation speed is increased each time by 500rpm until the pressure meets the corresponding requirement, and then the rotation speed is stored to operate, and of course, other existing modes may also be used to adjust the rotation speed, which is not limited in the present invention.
Further, as shown in fig. 2, in order to improve the efficiency of adjusting the rotation speed of the compressor and enable the actual pressure to quickly reach the pressure requirement, the determining whether the actual pressure meets the pressure requirement includes:
step 3.1, firstly, judging whether the actual suction pressure meets the suction pressure requirement, namely judging whether the actual suction pressure is lower than the upper limit value of the low pressure, if not, executing step 3.2, and if so, executing step 3.3;
step 3.2, increasing the rotating speed of the low-pressure stage compressor 1, and returning to the step 3.1;
3.3, judging whether the actual exhaust pressure meets the exhaust pressure requirement, namely judging whether the actual exhaust pressure is lower than a high-pressure upper limit value, if not, executing the step 3.4, and if so, executing the step 3.5;
step 3.4, reducing the rotating speed of the high-pressure stage compressor 2, and returning to the step 3.3;
step 3.5, judging whether the actual air supplement pressure meets the air supplement pressure requirement, namely judging whether the actual air supplement pressure reaches a preset value, if so, keeping the current rotating speed of the high-pressure stage compressor 2 and the low-pressure stage compressor 1, and if not, comparing the actual air supplement pressure with the preset value, executing the step 3.6 when the actual air supplement pressure is higher than the preset value, and executing the step 3.7 when the actual air supplement pressure is lower than the preset value;
step 3.6, increasing the rotating speed of the high-pressure stage compressor 2 or reducing the rotating speed of the low-pressure stage compressor 1, and returning to the step 3.1;
and 3.7, reducing the rotating speed of the high-pressure stage compressor 2 or increasing the rotating speed of the low-pressure stage compressor 1, and returning to the step 3.1.
As shown in fig. 1, the present invention also provides a refrigeration device using the above two-stage compressor refrigeration system, when the refrigeration device is a refrigerator, the first evaporator is a refrigerating chamber evaporator, the compartment where the first evaporator 7 is located is a refrigerating chamber, and the second evaporator 11 is a freezing chamber evaporator. The compartment in which the second evaporator 11 is located is a freezing compartment. The outlet of the condenser 3 is connected with a drying filter which is mainly used for absorbing moisture and dust in the refrigeration loop, ensuring the cleanness and dryness of the refrigeration loop and prolonging the service life of the refrigeration system. The export of condenser 3 and establish ties between drier-filter 5 and have prevent congealing tub 4, because refrigerator door edge temperature is lower, can appear the drop of water in humid weather, consequently prevent congealing tub 4 at refrigerator door edge design, prevent congealing tub 4 and link to each other with condenser 3, at refrigerator refrigeration in-process, the highly compressed liquid refrigerant of medium temperature can flow through from preventing congealing tub 4, prevent congealing tub 4 and generate heat and appear the drop of water of condensation in order to prevent refrigerator door edge, play the dew prevention effect. A drying filter 5 is connected in series between the condensation preventing pipe 4 and the inlet of the primary throttling element 6, and is mainly used for absorbing moisture and dust in the refrigeration loop, ensuring cleanness and dryness of the refrigeration loop and prolonging the service life of the refrigeration system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (11)
1. A method of controlling a two-stage compressor, comprising the steps of:
obtaining working parameters of a refrigerating system where a two-stage compressor is located, and determining the pressure requirement of the two-stage compressor according to the working parameters;
detecting an actual pressure of the two-stage compressor;
and judging whether the actual pressure meets the pressure requirement, and regulating the rotating speed of a low-pressure stage compressor and/or the rotating speed of a high-pressure stage compressor of the double-stage compressor according to a judgment result until the actual pressure meets the pressure requirement.
2. The dual stage compressor control method of claim 1, wherein the operating parameters include: at least one of a target temperature parameter reflecting a refrigeration demand and an actual temperature parameter reflecting an operating condition.
3. The dual stage compressor control method of claim 1, wherein the pressure requirements of the dual stage compressor comprise: the air suction pressure requirement of the low-pressure stage compressor, the exhaust pressure requirement of the high-pressure stage compressor and the air supply pressure requirement;
the suction pressure requirement is that the actual suction pressure of the low-pressure stage compressor is lower than a low-pressure upper limit value;
the discharge pressure requirement is that the actual discharge pressure of the high pressure stage compressor is lower than a high pressure upper limit value;
the air supply pressure requirement is that the actual air supply pressure of the high-pressure stage compressor reaches a preset value.
4. The dual stage compressor control method of claim 3, wherein determining the pressure requirement of the dual stage compressor from the operating parameter comprises:
acquiring a corresponding low-pressure upper limit value, a corresponding high-pressure upper limit value and a corresponding preset value from a preset comparison relation between working parameters and pressure values according to the working parameters;
and respectively determining the suction pressure requirement, the exhaust pressure requirement and the air supply pressure requirement according to the acquired low-pressure upper limit value, high-pressure upper limit value and preset value.
5. The two-stage compressor control method according to claim 3 or 4, wherein the actual pressure of the two-stage compressor comprises: actual suction pressure of the low-pressure stage compressor, actual discharge pressure of the high-pressure stage compressor and actual make-up pressure;
adjusting the low-pressure stage compressor rotation speed and/or the high-pressure stage compressor rotation speed of the two-stage compressor according to the judgment result comprises:
increasing the speed of the low pressure stage compressor when the actual suction pressure does not meet the suction pressure requirement;
reducing a speed of the high pressure stage compressor when the actual discharge pressure does not meet the discharge pressure requirement;
and when the actual air supplement pressure does not meet the air supplement pressure requirement, if the actual air supplement pressure is higher than a preset value, increasing the rotating speed of the high-pressure stage compressor and/or decreasing the rotating speed of the low-pressure stage compressor, and if the actual air supplement pressure is lower than the preset value, decreasing the rotating speed of the high-pressure stage compressor and/or increasing the rotating speed of the low-pressure stage compressor.
6. The dual-stage compressor control method of claim 5, wherein determining whether the actual pressure meets the pressure requirement comprises:
firstly, judging whether the actual suction pressure meets the suction pressure requirement, and adjusting the rotating speed of the low-pressure stage compressor according to a judgment result until the actual suction pressure meets the suction pressure requirement;
judging whether the actual exhaust pressure meets the exhaust pressure requirement, and regulating the rotating speed of the high-pressure stage compressor according to a judgment result until the actual exhaust pressure meets the exhaust pressure requirement;
and finally, judging whether the actual air supplement pressure meets the air supplement pressure requirement or not, and adjusting the rotating speed of the high-pressure stage compressor and/or the low-pressure stage compressor according to a judgment result until the actual air supplement pressure meets the air supplement pressure requirement.
7. The dual-stage compressor control method of claim 6, wherein when the actual boost pressure does not meet the boost pressure requirement, the determination of whether the actual pressure meets the pressure requirement is restarted after adjusting the rotation speed of the high-pressure stage compressor and/or the low-pressure stage compressor.
8. A dual stage compressor refrigeration system comprising: the double-stage compressor comprises a refrigeration loop with a double-stage compressor and a control module for controlling the working state of the double-stage compressor, wherein the double-stage compressor consists of a low-pressure stage compressor and a high-pressure stage compressor, and is characterized by also comprising a detection module for detecting the actual pressure of the double-stage compressor; the control module obtains working parameters of a refrigeration system where the control module is located, determines pressure requirements of the two-stage compressor, and adjusts the rotating speed of the low-pressure stage compressor and/or the rotating speed of the high-pressure stage compressor according to the pressure requirements until the actual pressure meets the pressure requirements.
9. The dual stage compressor refrigeration system of claim 8, wherein the detection module comprises: the system comprises a first detection device for detecting the actual suction pressure of the low-pressure stage compressor, a second detection device for detecting the actual exhaust pressure of the high-pressure stage compressor, and a third detection device for detecting the actual air supply pressure of the high-pressure stage compressor.
10. Refrigeration plant characterized in that it uses a two-stage compressor refrigeration system according to claim 8 or 9.
11. The refrigeration appliance of claim 10 wherein the refrigeration appliance is a refrigerator.
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| CN202011467466.4A CN112361685B (en) | 2020-12-14 | 2020-12-14 | Two-stage compressor control method, two-stage compressor refrigeration system and refrigeration equipment |
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| JP2016090143A (en) * | 2014-11-05 | 2016-05-23 | 三菱重工業株式会社 | Two-stage compression type refrigeration cycle, and its control device and control method |
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