CN115307353B - Control method and system for improving operation reliability of jet compressor - Google Patents
Control method and system for improving operation reliability of jet compressor Download PDFInfo
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- CN115307353B CN115307353B CN202211024067.XA CN202211024067A CN115307353B CN 115307353 B CN115307353 B CN 115307353B CN 202211024067 A CN202211024067 A CN 202211024067A CN 115307353 B CN115307353 B CN 115307353B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004781 supercooling Methods 0.000 claims abstract description 58
- 238000002347 injection Methods 0.000 claims abstract description 21
- 239000007924 injection Substances 0.000 claims abstract description 21
- 238000012937 correction Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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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
-
- 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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- 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
-
- 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
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method and a control system for improving the operation reliability of a jet compressor, which belong to the technical field of compressor control and aim to solve the problems that the operation reliability of the compressor is affected and liquid return is easy to occur due to inadequate switching time of a supercooling electromagnetic valve of the compressor in the prior art. The method comprises the steps of calculating the middle pressure of a compressor, comparing the middle pressure with the air injection pressure of the compressor, and adjusting the working state of a supercooling electromagnetic valve; calculating the superheat degree of the economizer, comparing the superheat degree with a preset value, and adjusting the working state of the supercooling electronic expansion valve; the invention is suitable for controlling the compressor, and controls the switch of the supercooling electromagnetic valve, so that the switch time of the supercooling electromagnetic valve is proper; the opening degree of the supercooling electronic expansion valve is adjusted, so that the supercooling effect of the economizer can be ensured, jet liquid can be avoided, the load of the compressor can be effectively reduced, and the operation reliability of the compressor is improved.
Description
Technical Field
The invention relates to a control method and a control system for improving the operation reliability of a jet compressor, and belongs to the technical field of compressor control.
Background
With the development of the current society, the air conditioning unit is more and more widely applied to the living scenes of people. For public places (such as markets, hospitals and exhibition halls), large-scale central air-conditioning air pipe units are often used, and for large-scale units, vortex jet compressors are often used, so that the efficiency of the vortex jet compressors is high, the heating capacity can be effectively improved in a low-temperature environment, the air return quantity can be improved in the running process, and the enthalpy increasing purpose is achieved.
The air jet of the existing vortex air jet compressor is positioned at the middle position, the air jet pressure requirement is high, the switching time of the supercooling electromagnetic valve is not proper enough, the operation reliability of the compressor is affected, liquid return is easy to exist, and the load of the compressor is increased or the compressor is damaged easily.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a control method and a control system for improving the operation reliability of a jet compressor, and solves the problems that the switching time of a supercooling electromagnetic valve of the conventional vortex jet compressor is not proper enough, the operation reliability of the compressor is affected and liquid return is easy to occur.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides a control method for improving operation reliability of a jet compressor, comprising: acquiring the current system high pressure, system low pressure, jet maximum pressure value and jet pressure of the compressor;
calculating the middle pressure of the compressor according to the current system high pressure, system low pressure, jet maximum pressure value and jet pressure of the compressor;
comparing the air injection pressure of the compressor with the middle pressure, and adjusting the working state of the supercooling electromagnetic valve according to the comparison result;
acquiring the current outlet temperature and the current inlet temperature of the economizer;
calculating the superheat degree of the economizer according to the current outlet temperature and the current inlet temperature of the economizer;
and comparing the superheat degree of the economizer with a preset value, and adjusting the working state of the supercooling electronic expansion valve according to the comparison result.
Further, the middle pressure of the compressor is obtained by the following formula:
wherein: p (P) 0 Is the middle pressure of the compressor; p (P) d The current system high pressure of the compressor; p (P) s The current system low pressure for the compressor; k is a correction coefficient.
Further, the modification coefficient includes:
acquiring a current ambient temperature, wherein:
if TH is the 0 <At 30 ℃, k is 0.8;
if the temperature is less than or equal to 30 ℃ TH 0 K is 0.9 when the temperature is less than or equal to 40 ℃;
if TH is the 0 >At 40 ℃, k is 0.95;
wherein: TH (TH) 0 Is ambient temperature.
Further, comparing the air injection pressure of the compressor with the middle pressure, and adjusting the working state of the supercooling electromagnetic valve according to the comparison result comprises:
if P t <P 0 The supercooling electromagnetic valve is in an open state;
if P 0 <P t <P k The supercooling electromagnetic valve is in a closed state;
if P t >P k The supercooling electromagnetic valve is in an open state;
wherein: p (P) k Maximum pressure value of jet air for compressor; p (P) t Is the gas injection pressure of the compressor.
Further, the superheat of the economizer is calculated and obtained by adopting the following formula:
SH 1 ＝TH 2 -TH 1
wherein: SH 1 Is the superheat degree of the economizer; TH (TH) 2 Is the outlet temperature of the economizer; TH (TH) 1 Is the inlet temperature of the economizer.
Further, comparing the superheat degree of the economizer with a preset value, and adjusting the working state of the supercooling electronic expansion valve according to the comparison result comprises:
if SH 1 <TSH 1 The opening degree of the supercooling electronic expansion valve is reduced;
if SH 1 ＝TSH 1 The opening degree of the supercooling electronic expansion valve is kept unchanged;
if SH 1 >TSH 1 The opening degree of the supercooling electronic expansion valve is increased;
wherein: TSH (TSH) 1 Is a preset value.
Further, the preset value includes:
obtaining the outlet temperature of a condenser of a current outdoor unit, wherein:
if TH is the 3 <TSH at 20 °c 1 6;
if the temperature is less than or equal to 20 ℃ TH 3 TSH at 30℃or lower 1 10;
if TH is the 3 >30 ℃, TSH 1 Is 15；
Wherein: TH (TH) 3 The outlet temperature of the condenser of the external machine.
In a second aspect, the present invention provides a control system for improving the operational reliability of a jet compressor, comprising: the first acquisition module: the method is used for acquiring the current system high pressure, system low pressure, jet maximum pressure value and jet pressure of the compressor;
a first calculation module: the method is used for calculating the middle pressure of the compressor according to the current system high pressure, system low pressure, jet maximum pressure value and jet pressure of the compressor;
a first control module: the working state of the supercooling electromagnetic valve is adjusted according to the comparison result;
the second acquisition module: the method is used for acquiring the current outlet temperature and the current inlet temperature of the economizer;
a second calculation module: the method is used for calculating the superheat degree of the economizer according to the current outlet temperature and the current inlet temperature of the economizer;
and a second control module: and the super-cooling electronic expansion valve is used for comparing the superheat degree of the economizer with a preset value and adjusting the working state of the super-cooling electronic expansion valve according to the comparison result.
Further, the first acquisition module comprises a high pressure sensor, a low pressure sensor and an air injection pressure sensor, wherein the high pressure sensor is used for detecting the high pressure of the system, the low pressure sensor is used for detecting the low pressure of the system, and the air injection pressure sensor is used for detecting the air injection pressure.
Further, the second acquisition module includes an economizer inlet temperature sensor for detecting an inlet temperature of the economizer and an economizer outlet temperature sensor for detecting an outlet temperature of the economizer.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the air injection pressure is compared with the middle pressure, so that the switching of the supercooling electromagnetic valve is controlled, the switching time of the supercooling electromagnetic valve is proper, and the running reliability of the compressor is ensured; the superheat degree of the economizer is compared with the preset value, so that the opening degree of the supercooling electronic expansion valve is adjusted, the supercooling effect of the economizer can be ensured, the air injection liquid carrying can be avoided, the load of the compressor can be effectively reduced, and the operation reliability of the compressor is improved.
Drawings
FIG. 1 is a flow chart of a control method for improving the operational reliability of a jet compressor according to an embodiment of the present invention;
fig. 2 is a schematic system configuration diagram of a control system for improving operation reliability of a jet compressor according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
Embodiment one:
as shown in fig. 1, the present invention provides a control method for improving operation reliability of a jet compressor, comprising: acquiring the current system high pressure, system low pressure, jet maximum pressure value and jet pressure of the compressor;
calculating the middle pressure of the compressor according to the current system high pressure, system low pressure, jet maximum pressure value and jet pressure of the compressor;
the middle pressure of the compressor is obtained by adopting the following formula:
wherein: p (P) 0 Is the middle pressure of the compressor; p (P) d The current system high pressure of the compressor; p (P) s The current system low pressure for the compressor; k is a correction coefficient.
The correction coefficient comprises the following values:
acquiring a current ambient temperature, wherein:
if TH is the 0 <At 30 ℃, k is 0.8;
if the temperature is less than or equal to 30 ℃ TH 0 K is 0.9 when the temperature is less than or equal to 40 ℃;
if TH is the 0 >At 40 ℃, k is 0.95;
wherein: TH (TH) 0 Is ambient temperature.
Comparing the air injection pressure of the compressor with the middle pressure, and adjusting the working state of the supercooling electromagnetic valve according to the comparison result;
wherein, compare the jet pressure of compressor with middle part pressure, adjust the operating condition of subcooling solenoid valve according to the comparison result includes:
if P t <P 0 The supercooling electromagnetic valve is in an open state, and the compressor does not jet air at the moment;
if P 0 <P t <P k The supercooling electromagnetic valve is in a closed state;
if P t >P k The supercooling electromagnetic valve is in an open state, supercooling refrigerant flows back to the gas separation container, and high-pressure air injection is prevented from directly entering the compressor, so that the reliability of the compressor is prevented from being influenced;
wherein: p (P) k Maximum pressure value of jet air for compressor; p (P) t Is the gas injection pressure of the compressor; according to the invention, the middle pressure of the compressor is calculated through the high pressure and the low pressure of the system, and the air injection pressure is compared with the middle pressure, so that the switching of the supercooling electromagnetic valve is controlled, the switching time of the supercooling electromagnetic valve is proper, and the running reliability of the compressor is ensured.
Acquiring the current outlet temperature and the current inlet temperature of the economizer;
calculating the superheat degree of the economizer according to the current outlet temperature and the current inlet temperature of the economizer;
wherein, the superheat degree of the economizer is calculated and obtained by adopting the following formula:
SH 1 ＝TH 2 -TH 1
wherein: SH 1 Is the superheat degree of the economizer; TH (TH) 2 Is the outlet temperature of the economizer; TH (TH) 1 Is the inlet temperature of the economizer.
And comparing the superheat degree of the economizer with a preset value, and adjusting the working state of the supercooling electronic expansion valve according to the comparison result.
Wherein, compare the superheat degree of economizer with the default, adjust the operating condition of subcooling electronic expansion valve according to the comparison result and include:
if SH 1 <TSH 1 The opening degree of the supercooling electronic expansion valve is reduced;
if SH 1 ＝TSH 1 The opening degree of the supercooling electronic expansion valve is kept unchanged;
if SH 1 >TSH 1 The opening degree of the supercooling electronic expansion valve is increased;
wherein: TSH (TSH) 1 Is a preset value.
Wherein, the value of the preset value comprises:
obtaining the outlet temperature of a condenser of a current outdoor unit, wherein:
if TH is the 3 <TSH at 20 °c 1 6;
if the temperature is less than or equal to 20 ℃ TH 3 TSH at 30℃or lower 1 10;
if TH is the 3 >30 ℃, TSH 1 15;
wherein: TH (TH) 3 The outlet temperature of the condenser of the external machine.
According to the invention, the degree of superheat of the economizer is compared with the preset value, so that the opening of the supercooling electronic expansion valve is adjusted, the supercooling effect of the economizer can be ensured, the liquid-carrying of air injection can be avoided, the load of the compressor can be effectively reduced, and the operation reliability of the compressor can be improved.
In summary, the invention controls the switch of the supercooling electromagnetic valve through the comparison and judgment of the middle pressure and the jet pressure, and simultaneously adjusts the opening of the supercooling electronic expansion valve through the comparison and judgment of the superheat degree of the economizer and the preset value, on the premise of ensuring that the use of the economizer has supercooling effect, the switch of the jet of the compressor is influenced and the jet refrigerant is ensured to be in a gaseous state, thereby improving the reliability of the compressor.
Embodiment two:
as shown in fig. 2, the present invention provides a control system for improving operation reliability of a jet compressor, comprising: the first acquisition module: the method is used for acquiring the current system high pressure, system low pressure, jet maximum pressure value and jet pressure of the compressor;
a first calculation module: the method is used for calculating the middle pressure of the compressor according to the current system high pressure, system low pressure, jet maximum pressure value and jet pressure of the compressor;
a first control module: the working state of the supercooling electromagnetic valve is adjusted according to the comparison result;
the second acquisition module: the method is used for acquiring the current outlet temperature and the current inlet temperature of the economizer;
a second calculation module: the method is used for calculating the superheat degree of the economizer according to the current outlet temperature and the current inlet temperature of the economizer;
and a second control module: and the super-cooling electronic expansion valve is used for comparing the superheat degree of the economizer with a preset value and adjusting the working state of the super-cooling electronic expansion valve according to the comparison result.
The first acquisition module comprises a high pressure sensor, a low pressure sensor and an air injection pressure sensor, wherein the high pressure sensor is used for detecting high pressure of the system, the low pressure sensor is used for detecting low pressure of the system, the air injection pressure sensor is used for detecting air injection pressure, the second acquisition module comprises an economizer inlet temperature sensor and an economizer outlet temperature sensor, the economizer inlet temperature sensor is used for detecting inlet temperature of the economizer, the economizer outlet temperature sensor is used for detecting outlet temperature of the economizer, the high pressure sensor is connected with an oil separator, the low pressure sensor is connected with a gas separator, the air injection pressure sensor is connected with a compressor, and the economizer inlet temperature sensor and the economizer outlet temperature sensor are respectively located at two ends of the economizer.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (7)
1. A control method for improving operational reliability of a jet compressor, comprising:
acquiring the current system high pressure, system low pressure, jet maximum pressure value and jet pressure of the compressor;
calculating the middle pressure of the compressor according to the current system high pressure, system low pressure, jet maximum pressure value and jet pressure of the compressor;
comparing the air injection pressure of the compressor with the middle pressure, and adjusting the working state of the supercooling electromagnetic valve according to the comparison result;
acquiring the current outlet temperature and the current inlet temperature of the economizer;
calculating the superheat degree of the economizer according to the current outlet temperature and the current inlet temperature of the economizer;
comparing the superheat degree of the economizer with a preset value, and adjusting the working state of the supercooling electronic expansion valve according to the comparison result;
the middle pressure of the compressor is calculated and obtained by adopting the following formula:
wherein: p (P) 0 Is the middle pressure of the compressor; p (P) d The current system high pressure of the compressor; p (P) s The current system low pressure for the compressor; k is a correction coefficient;
the correction coefficient comprises the following values:
acquiring a current ambient temperature, wherein:
if TH is the 0 <At 30 ℃, k is 0.8;
if the temperature is less than or equal to 30 ℃ TH 0 K is 0.9 when the temperature is less than or equal to 40 ℃;
if TH is the 0 >At 40 ℃, k is 0.95;
wherein: TH (TH) 0 Is ambient temperature;
comparing the air injection pressure of the compressor with the middle pressure, and adjusting the working state of the supercooling electromagnetic valve according to the comparison result comprises the following steps:
if P t <P 0 The supercooling electromagnetic valve is in an open state;
if P 0 <P t <P k The supercooling electromagnetic valve is in a closed state;
if P t >P k The supercooling electromagnetic valve is in an open state;
wherein: p (P) k Maximum pressure value of jet air for compressor; p (P) t For the gas injection pressure of the compressor。
2. The control method for improving the operation reliability of a jet compressor according to claim 1, wherein the superheat degree of the economizer is calculated by the following formula:
SH 1 ＝TH 2 -TH 1
wherein: SH 1 Is the superheat degree of the economizer; TH (TH) 2 Is the outlet temperature of the economizer; TH (TH) 1 Is the inlet temperature of the economizer.
3. The control method for improving the operation reliability of a jet compressor according to claim 2, wherein comparing the superheat degree of the economizer with a preset value, and adjusting the operation state of the supercooling electronic expansion valve according to the comparison result comprises:
if SH 1 <TSH 1 The opening degree of the supercooling electronic expansion valve is reduced;
if SH 1 ＝TSH 1 The opening degree of the supercooling electronic expansion valve is kept unchanged;
if SH 1 >TSH 1 The opening degree of the supercooling electronic expansion valve is increased;
wherein: TSH (TSH) 1 Is a preset value.
4. A control method for improving the operational reliability of a jet compressor according to claim 3, wherein the predetermined value comprises:
obtaining the outlet temperature of a condenser of a current outdoor unit, wherein:
if TH is the 3 <TSH at 20 °c 1 6;
if the temperature is less than or equal to 20 ℃ TH 3 TSH at 30℃or lower 1 10;
if TH is the 3 >30 ℃, TSH 1 15;
wherein: TH (TH) 3 The outlet temperature of the condenser of the external machine.
5. A control system for improving operational reliability of a jet compressor for implementing a control method for improving operational reliability of a jet compressor as set forth in claim 1, comprising:
the first acquisition module: the method is used for acquiring the current system high pressure, system low pressure, jet maximum pressure value and jet pressure of the compressor;
a first calculation module: the method is used for calculating the middle pressure of the compressor according to the current system high pressure, system low pressure, jet maximum pressure value and jet pressure of the compressor;
a first control module: the working state of the supercooling electromagnetic valve is adjusted according to the comparison result;
the second acquisition module: the method is used for acquiring the current outlet temperature and the current inlet temperature of the economizer;
a second calculation module: the method is used for calculating the superheat degree of the economizer according to the current outlet temperature and the current inlet temperature of the economizer;
and a second control module: and the super-cooling electronic expansion valve is used for comparing the superheat degree of the economizer with a preset value and adjusting the working state of the super-cooling electronic expansion valve according to the comparison result.
6. The control system for improving operational reliability of a jet compressor of claim 5, wherein said first acquisition module comprises a high pressure sensor for detecting system high pressure, a low pressure sensor for detecting system low pressure, and a jet pressure sensor for detecting jet pressure.
7. The control system for increasing reliability of operation of a jet compressor of claim 5 wherein said second acquisition module comprises an economizer inlet temperature sensor for detecting an inlet temperature of said economizer and an economizer outlet temperature sensor for detecting an outlet temperature of said economizer.
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| CN114294715A (en) * | 2021-12-29 | 2022-04-08 | 郑州之铂智能科技有限公司 | Multi-split air-supplementing enthalpy-increasing system with economizer and control method thereof |
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2022
- 2022-08-24 CN CN202211024067.XA patent/CN115307353B/en active Active
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