CN113340031B - CO (carbon monoxide) 2 Control method for heat pump system, control system for heat pump system, and storage medium - Google Patents
CO (carbon monoxide) 2 Control method for heat pump system, control system for heat pump system, and storage medium Download PDFInfo
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- CN113340031B CN113340031B CN202110582136.8A CN202110582136A CN113340031B CN 113340031 B CN113340031 B CN 113340031B CN 202110582136 A CN202110582136 A CN 202110582136A CN 113340031 B CN113340031 B CN 113340031B
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- 238000000034 method Methods 0.000 title claims abstract description 41
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 title claims description 6
- 230000006835 compression Effects 0.000 claims abstract description 63
- 238000007906 compression Methods 0.000 claims abstract description 63
- 238000004590 computer program Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a CO 2 A method of controlling a heat pump system, comprising the steps of: presetting pressure thresholds for obtaining different adjusting modes of the electronic expansion valve by comparing with the pressure difference; obtaining a first stage of compressionThe exhaust pressure value and the second-stage compression exhaust pressure value; calculating a pressure difference value delta P between the second-stage compression exhaust pressure value and the first-stage compression exhaust pressure value; comparing said pressure difference Δ Ρ to a pressure threshold; and judging whether to send a signal for adjusting the opening degree of the electronic expansion valve according to the comparison result so as to adjust or keep the opening degree of the electronic expansion valve unchanged. The technology compares the difference value of the exhaust pressure values of the two compressors with a set pressure threshold value, and then flexibly adjusts the opening of the electronic expansion valve according to the difference of comparison results, thereby avoiding the second-stage compression failure of the two-stage rotor compressor in advance, preventing the second-stage compression failure of the rotor compressor and causing accidents in the working process, and ensuring the working reliability.
Description
Technical Field
The invention relates to the technical field of heat pump system control, in particular to CO 2 Provided are a heat pump system control method, a heat pump system control system, and a storage medium.
Background
The mature available CO2 compressors on the market today are not many, mostly of the piston and rotor type. The capacity of the compressor to produce hot water at high temperatures at low ring temperatures is greatly diminished due to the reduced volumetric efficiency and increased seal leakage of the piston compressor at low temperatures.
And the sealing clearance of the rotor compressor is small, especially the compression ratio of each stage of the two-stage rotor compressor is reduced through two-stage compression, the leakage amount is effectively reduced, and the capacity and the energy efficiency at low ring temperature are higher. However, the sealing sliding vane of the compression chamber of the two-stage rotor compressor is pressed by the exhaust back pressure to maintain the sealing, and if the sliding vane, particularly the sliding vane of the second-stage compression, frequently jumps due to insufficient exhaust back pressure, the compression failure can be caused. This phenomenon is often seen in "higher low pressure, lower high pressure" applications. At present, a common solution is to adopt various remedial measures to improve exhaust back pressure and restore sealing again after secondary compression failure occurs, however, the mode can cause great fluctuation of the compressed exhaust pressure, thereby causing triggering high-pressure protection or current overload, and limiting popularization and application of the two-stage rotor compressor.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a CO 2 The control method of the heat pump system ensures the reliability of preventing the second-stage compression work of the rotor type compressor.
In order to achieve the purpose, the invention adopts the following technical scheme:
CO (carbon monoxide) 2 A method of controlling a heat pump system, comprising the steps of:
presetting pressure thresholds for obtaining different adjusting modes of the electronic expansion valve by comparing with the pressure difference;
acquiring a first-stage compression exhaust pressure value and a second-stage compression exhaust pressure value;
calculating a pressure difference value delta P between the second-stage compression exhaust pressure value and the first-stage compression exhaust pressure value;
comparing said pressure difference Δ Ρ to a pressure threshold;
and judging whether to send a signal for adjusting the opening degree of the electronic expansion valve according to the comparison result so as to adjust or keep the opening degree of the electronic expansion valve unchanged.
Preferably, the pressure threshold includes a first preset pressure threshold and a second preset pressure threshold, and the first preset pressure threshold is smaller than the second preset pressure threshold; comparing the pressure difference value delta P with a first preset pressure threshold of the pressure threshold, and if the pressure difference value delta P is smaller than the first preset pressure threshold, sending a signal for forcibly closing the electronic expansion valve; and if the pressure difference value delta P is larger than or equal to a first preset pressure threshold value, comparing the pressure difference value delta P with a second preset pressure threshold value.
Preferably, if the pressure difference Δ P is smaller than a first preset pressure threshold, a signal for forcibly closing the electronic expansion valve is sent.
Preferably, no signal is sent to adjust the electronic expansion valve if said pressure difference Δ P is greater than or equal to a preset first pressure threshold.
As a preference, the first and second liquid crystal compositions are,
if the pressure difference value delta P is greater than or equal to a preset first pressure threshold value and less than or equal to a second preset pressure threshold value, a signal for adjusting the electronic expansion valve is not sent, and the opening degree of the electronic expansion valve is kept unchanged;
and if the pressure difference value delta P is larger than a second preset pressure threshold value, a signal for adjusting the electronic expansion valve is not sent, and the opening of the electronic expansion valve is adjusted according to other logic control methods.
Preferably, the first preset pressure threshold is 5 to 8Bar.
Preferably, the second pressure threshold is 9 to 12Bar.
CO (carbon monoxide) 2 A control device for a heat pump system, comprising:
the system comprises a presetting module, a control module and a control module, wherein the presetting module is used for presetting a first preset pressure threshold and a second preset pressure threshold;
the acquisition module is used for acquiring a first-stage compression exhaust pressure value and a second-stage compression exhaust pressure value;
the calculating module is used for calculating the difference value delta P between the second-stage compression exhaust pressure value and the first-stage compression exhaust pressure value;
the comparison module is used for comparing the pressure difference value delta P with a first preset pressure threshold value and a second preset pressure threshold value;
and the judging module is used for judging whether to send a signal for adjusting the opening of the electronic expansion valve so as to adjust or keep the opening of the electronic expansion valve unchanged.
A control terminal comprises a first pressure sensor, a second pressure sensor, a processor and a memory;
the first pressure sensor is arranged at the CO 2 The first-stage compression exhaust outlet of the two-stage rotor compressor is provided with the second pressure sensor arranged at the CO 2 A second stage compression exhaust outlet of the two-stage rotor compressor;
the memory for storing a computer program;
the processor is used for executing the computer program and realizing the CO2 heat pump system control method for preventing the second-stage compression failure of the rotor type compressor when the computer program is executed.
A computer readable storage medium storing a computer program which, when executed by a processor, causes the processor to implement a CO2 heat pump system control method of preventing a second stage compression failure of a rotary compressor as described.
The beneficial effects of the invention are as follows:
by the method and the system, the occurrence of the second-stage compression failure of the rotor compressor can be pre-judged and prevented in advance, accidents in the working process caused by the second-stage compression failure of the rotor compressor are prevented, and the working reliability is ensured. The technology compares the difference value of the exhaust pressure values of the two compressors with a set pressure threshold value, and then flexibly adjusts the opening of the electronic expansion valve according to the difference of comparison results, thereby avoiding the failure of the second-stage compression of the two-stage rotor compressor in advance, avoiding the major defects of the compressor of the type, improving the stability of the system and greatly expanding the application range of the whole machine.
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The invention is explained in more detail below with reference to the figures and examples.
FIG. 1 is a CO according to the invention 2 A flow chart of a method of controlling a heat pump system.
FIG. 2 is a CO according to the present invention 2 The pressure difference value delta P in the control method of the heat pump system is compared with a preset pressure threshold value.
FIG. 3 is a CO according to the present invention 2 Schematic diagram of a heat pump system.
Detailed Description
In order to make the technical problems solved, technical solutions adopted, and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention are described in further detail below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to FIGS. 1 and 2, the CO of the present invention 2 A method of controlling a heat pump system, comprising,
the method comprises the following steps:
presetting pressure thresholds which are used for obtaining different adjusting modes of the electronic expansion valve by comparing with the pressure difference, wherein the pressure thresholds comprise a first preset pressure threshold and a second preset pressure threshold; the second pressure threshold is greater than the first pressure threshold, specifically, the first preset pressure threshold is 5-8 Bar, and the second pressure threshold is 9-12 Bar.
Acquiring a first-stage compression exhaust pressure value and a second-stage compression exhaust pressure value; and acquiring a first-stage compression exhaust pressure value and a second-stage compression exhaust pressure value through a pressure sensor. The pressure sensor can be a capacitance type pressure sensor, a variable magnetic resistance type pressure sensor, a Hall type pressure sensor, an optical fiber type pressure sensor, a resonant type pressure sensor and the like. And a pressure acquisition circuit can be configured to acquire the pressure value according to the actual situation.
Calculating the difference value delta P between the second-stage compression exhaust pressure value and the first-stage compression exhaust pressure value;
comparing the pressure difference value delta P with a first preset pressure threshold value and a second preset pressure threshold value;
according to the comparison result, whether a signal for adjusting the opening degree of the electronic expansion valve is sent is judged so that the opening degree of the electronic expansion valve is adjusted or kept unchanged, and the method specifically comprises the following steps:
if the pressure difference value delta P is smaller than a first preset pressure threshold value, sending an adjusting signal, and adjusting the electronic expansion valve to forcibly close the valve; at this time, the second stage compression of the compressor is about to fail, namely, a signal for forcibly closing the electronic expansion valve is sent, so that the electronic expansion valve forcibly performs a valve closing action, and the difference between the first stage compression exhaust pressure and the second stage compression exhaust pressure is increased to avoid failure. In order to ensure that the electronic expansion valve can be adjusted in time when the pressure difference value delta P is smaller than a first preset pressure threshold value, a mistake-proofing node is added, which specifically comprises: and when the pressure difference value delta P is smaller than a first preset pressure threshold value, a signal is sent to the alarm system besides the adjustment of the electronic expansion valve, and the alarm system can realize alarm at the moment, and the matching alarm system can be matched with a remote terminal to realize alarm prompt. Through the warning suggestion, the staff can recheck, and whether electronic expansion valve has carried out the regulation of aperture, if do not, can carry out the manual work and intervene, guarantee electronic expansion valve's smooth work.
If the pressure difference value delta P is greater than or equal to a first preset pressure threshold value and less than or equal to a second preset pressure threshold value, a signal for adjusting the electronic expansion valve is not sent, and the opening degree of the electronic expansion valve is kept unchanged; at the moment, the second stage of compression of the compressor only risks failure, and the opening degree of the electronic expansion valve is kept unchanged.
And if the pressure difference value delta P is larger than a second preset pressure threshold value, a signal for adjusting the electronic expansion valve is not sent, and the opening of the electronic expansion valve is adjusted according to other logic control methods. At this time, the second stage of compression of the compressor is far away from the failure risk, and the opening degree of the electronic expansion valve is adjusted according to other logic control methods. Other logic control methods comprise an exhaust pressure method, an exhaust temperature method, an overfire degree method and the like, and the electronic expansion valve can be controlled by adopting other methods according to actual requirements so as to be continuously operated according to reasonable arrangement.
Through the steps, the electronic expansion valve is adjusted, and the normal use of the electronic expansion valve is ensured. To react with CO 2 Long-term guarantee of heat pump system, CO 2 After the two-stage rotor compressor is started, the method needs to be executed circularly.
In coordination with the above method, as shown in FIG. 3, the present invention also provides a CO 2 A control device for a heat pump system, comprising:
the system comprises a presetting module, a control module and a control module, wherein the presetting module is used for presetting a first preset pressure threshold and a second preset pressure threshold;
the acquisition module is used for acquiring a first-stage compression exhaust pressure value and a second-stage compression exhaust pressure value;
the calculating module is used for calculating the difference value delta P between the second-stage compression exhaust pressure value and the first-stage compression exhaust pressure value;
the comparison module is used for comparing the pressure difference value delta P with a first preset pressure threshold value and a second preset pressure threshold value;
and the judging module is used for judging whether to send a signal for adjusting the opening of the electronic expansion valve so as to adjust or keep the opening of the electronic expansion valve unchanged.
In order to realize the method, CO is required 2 The first pressure sensor is arranged at the first-stage compression exhaust outlet of the two-stage rotor compressor, and CO is arranged at the first-stage compression exhaust outlet 2 And a second pressure sensor is arranged at a second-stage compression exhaust outlet of the two-stage rotor compressor. The first-stage compression exhaust pressure value is acquired through the first pressure sensor, the second-stage compression exhaust pressure value is acquired through the second pressure sensor, so that the pressure value is monitored, and then the opening degree of the electronic expansion valve is adjusted.
The invention provides a CO sensor which is provided with a first pressure sensor and a second pressure sensor in a matching way 2 The control system of the heat pump system comprises a first pressure sensor, a second pressure sensor, a processor and a memory;
the first pressure sensor is arranged at the CO 2 The first-stage compression exhaust outlet of the two-stage rotor compressor is provided with a second pressure sensor arranged at the CO 2 A second stage compression exhaust outlet of the two-stage rotor compressor;
a memory for storing a computer program;
and the processor is used for executing the computer program and realizing the control method of the CO2 heat pump system for preventing the second-stage compression failure of the rotor type compressor when the computer program is executed.
The processor may be a central processing unit, other general purpose processor, a digital signal processor, an application specific integrated circuit, etc.
The memory may be used to store the programs and/or modules, and the processor may perform various functions by operating or executing the programs and/or modules stored in the memory and calling data stored in the memory.
The terminal device integrated module/unit, if implemented in the form of a software functional unit and sold or used as a separate product, may be stored in a computer-readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a program, which may be stored in a readable storage medium and executed by a processor, to implement the steps of the above-described method embodiments.
A computer readable storage medium according to the present invention stores a computer program which, when executed by a processor, causes the processor to implement the CO2 heat pump system control method for preventing a second stage compression failure of a rotary compressor as described above.
The storage medium may be a magnetic disk, an optical disk, a Read Only Memory (ROM) or a Random Access Memory (RAM) hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The terms "comprises" and "comprising," as well as any variations thereof, referred to in the description herein, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, article, or apparatus. The terms "first" and "second" herein are used merely for descriptive purposes and are not intended to have a particular meaning.
Furthermore, it should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it will be understood by those skilled in the art that the specification as a whole and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be taken in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (6)
1. CO (carbon monoxide) 2 A control method of a heat pump system, characterized by comprising the steps of:
presetting pressure thresholds which are used for obtaining different adjusting modes of the electronic expansion valve by comparing with a pressure difference value, wherein the pressure thresholds comprise a first preset pressure threshold and a second preset pressure threshold, and the first preset pressure threshold is smaller than the second preset pressure threshold;
acquiring a first-stage compression exhaust pressure value and a second-stage compression exhaust pressure value;
calculating a pressure difference value delta P between the second-stage compression exhaust pressure value and the first-stage compression exhaust pressure value;
comparing the pressure difference value delta P with a pressure threshold value first preset pressure threshold value;
if the pressure difference value delta P is smaller than a first preset pressure threshold value, a signal for forcibly closing the electronic expansion valve is sent; if the pressure difference value delta P is larger than or equal to a first preset pressure threshold value, comparing the pressure difference value delta P with a second preset pressure threshold value; if the pressure difference value delta P is greater than or equal to a preset first pressure threshold value and less than or equal to a second preset pressure threshold value, a signal for adjusting the electronic expansion valve is not sent, and the opening degree of the electronic expansion valve is kept unchanged;
and if the pressure difference value delta P is larger than a second preset pressure threshold value, a signal for adjusting the electronic expansion valve is not sent, and the opening of the electronic expansion valve is adjusted according to other logic control methods.
2. CO according to claim 1 2 Method for controlling a heat pump system, characterized in that the first presetThe pressure threshold value is 5-8 Bar.
3. CO according to claim 1 2 The control method of the heat pump system is characterized in that the second preset pressure threshold value is 9-12 Bar.
4. CO (carbon monoxide) 2 A control device for a heat pump system, comprising:
the device comprises a presetting module, a control module and a control module, wherein the presetting module is used for presetting a first preset pressure threshold and a second preset pressure threshold;
the acquisition module is used for acquiring a first-stage compression exhaust pressure value and a second-stage compression exhaust pressure value;
the calculation module is used for calculating a pressure difference value delta P between a second-stage compression exhaust pressure value and a first-stage compression exhaust pressure value;
the comparison module is used for comparing the pressure difference value delta P with a first preset pressure threshold value and a second preset pressure threshold value;
and the judging module is used for judging whether to send a signal for adjusting the opening of the electronic expansion valve so as to adjust or keep the opening of the electronic expansion valve unchanged.
5. A control terminal is characterized by comprising a first pressure sensor, a second pressure sensor, a processor and a memory;
the first pressure sensor is arranged at the CO 2 The first-stage compression exhaust outlet of the two-stage rotor compressor is provided with the second pressure sensor arranged at the CO 2 A second stage compression exhaust outlet of the two-stage rotor compressor;
the memory for storing a computer program;
the processor for executing the computer program and when executing the computer program enabling the CO of any of claims 1 to 3 to prevent failure of the second stage compression of a rotary compressor 2 A control method of a heat pump system.
6. A computer-readable storage medium characterized byThe computer readable storage medium storing a computer program which, when executed by a processor, causes the processor to implement the CO of any of claims 1 to 3 for preventing a second stage compression failure of a rotary compressor 2 A control method of a heat pump system.
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| JP2812022B2 (en) * | 1991-11-12 | 1998-10-15 | 松下電器産業株式会社 | Multi-stage gas compressor with bypass valve device |
| JP3370026B2 (en) * | 1999-09-09 | 2003-01-27 | 三洋電機株式会社 | 2-stage compression type rotary compressor |
| WO2011055444A1 (en) * | 2009-11-06 | 2011-05-12 | 三菱電機株式会社 | Heat pump device, two-stage compressor, and method of operating heat pump device |
| CN201772684U (en) * | 2010-05-24 | 2011-03-23 | 上海日立电器有限公司 | Two-stage rotary compressor and heat pump cycle system with pressure relief and defrost |
| CN201772685U (en) * | 2010-05-24 | 2011-03-23 | 上海日立电器有限公司 | Two-stage rotary compressor and heat pump circulation system with variable capacity defrosting |
| JP2017044454A (en) * | 2015-08-28 | 2017-03-02 | 三菱重工業株式会社 | Refrigeration cycle device and control method for the same |
| CN105371548B (en) * | 2015-12-11 | 2017-11-21 | 珠海格力电器股份有限公司 | Air-supplementing enthalpy-increasing control method, equipment and device for two-stage compressor |
| CN105545742B (en) * | 2016-02-24 | 2017-10-31 | 珠海格力节能环保制冷技术研究中心有限公司 | Multi-cylinder twin-stage positive displacement compressor system and its control method of operational mode switching |
| US20180031282A1 (en) * | 2016-07-26 | 2018-02-01 | Lg Electronics Inc. | Supercritical refrigeration cycle apparatus and method for controlling supercritical refrigeration cycle apparatus |
| CN207433194U (en) * | 2017-10-24 | 2018-06-01 | 珠海格力电器股份有限公司 | Double-stage enthalpy-increasing air conditioning system for vehicle |
| CN110260569B (en) * | 2019-06-12 | 2020-06-16 | 珠海格力电器股份有限公司 | Heat pump unit, air conditioning system and regulation and control method thereof |
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