CN112984856A - Electronic valve control system suitable for modular water machine and control method thereof - Google Patents
Electronic valve control system suitable for modular water machine and control method thereof Download PDFInfo
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- CN112984856A CN112984856A CN202110348842.6A CN202110348842A CN112984856A CN 112984856 A CN112984856 A CN 112984856A CN 202110348842 A CN202110348842 A CN 202110348842A CN 112984856 A CN112984856 A CN 112984856A
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
Abstract
The invention discloses an electronic valve control system suitable for a modular water machine and a control method thereof, which respectively enter step A1 or step A2 according to a refrigeration mode or a heating mode; A1. the method comprises the steps that during the operation of a system in a cooling mode, the opening degree of an electronic expansion valve is dynamically adjusted based on the difference between the refrigerating return air superheat degree SH1 and a preset refrigerating target superheat degree N1, A2. during the operation of the system in a heating mode, the opening degree of the electronic expansion valve is dynamically adjusted based on the difference between the heating return air superheat degree SH3 and a preset heating target superheat degree N2, the method has the advantages of high adjusting speed, relatively accurate control and wide adjusting range, can adapt to various different environmental working conditions and water temperatures, and enables the performance of the system to be maintained at a high level.
Description
Technical Field
The invention relates to the technical field of modular water machines, in particular to an electronic valve control system suitable for a modular water machine and a control method thereof.
Background
At present, the market share of the central air conditioner is rapidly increased, and meanwhile, a control system of a module unit is slightly changed along with the time and the technical progress. The valve is controlled by a capillary tube and a thermal expansion valve which are rough at first more than ten years ago; then, the electronic expansion valve is used for setting different opening degrees according to the water temperature and the environment temperature range for control; and the control is performed by utilizing the superheat degree commonly at present. The control mode of the module water machine is developed more and more perfectly, and the control precision is higher and higher.
However, even though the conventional method of adjusting and distributing the refrigerant flow of the system by controlling the superheat degree through the electronic expansion valve has high control precision, the reliability and the safety of the system under certain severe working conditions still cannot be guaranteed. The reason is that the superheat degree of the module water machine is generally judged and controlled only by using the superheat degree of one end of the low-pressure side or the high-pressure side. The control mode has the defect that under the working conditions that the water temperature is too low or too high and the environment temperature is extreme, the control superheat degree and the actual superheat degree of the system have larger deviation, so that the conditions that the unit generates liquid return or air exhaust, the pressure is too high and the like to damage the press can be caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an electronic valve control system suitable for a modular water machine and a control method thereof.
In order to achieve the purpose, the electronic valve control system suitable for the module water machine comprises a compressor, a four-way valve, an outdoor heat exchanger, a hydraulic evaporator and an electronic expansion valve, wherein four interfaces of the four-way valve are respectively connected with an exhaust end of the compressor, an air return end of the compressor, the outdoor heat exchanger and the hydraulic evaporator, and two ends of the electronic expansion valve are respectively connected with the outdoor heat exchanger and the hydraulic evaporator; the system also comprises an exhaust temperature probe arranged at the exhaust end of the compressor, an air return temperature probe arranged at the air return end of the compressor, an outlet temperature probe arranged at the outlet position of the outdoor heat exchanger and an inlet temperature probe arranged at the refrigerant inlet position of the hydraulic evaporator, wherein the opening degree of the electronic expansion valve is dynamically adjusted based on the refrigerating air return superheat SH1 during the normal operation period of the system in a refrigeration mode; during the normal operation period of the system in the heating mode, the opening degree of the electronic expansion valve is dynamically connected based on the heating return air superheat degree SH3, wherein the refrigerating return air superheat degree SH1 is the difference value between the return air temperature TH obtained by monitoring a return air temperature probe and the inlet temperature T5 obtained by monitoring an inlet temperature probe; and the heating return air superheat SH3 is the difference value between the return air temperature probe TH and the outlet temperature T3 obtained by monitoring the outlet temperature probe.
An electronic valve control method suitable for a modular water machine comprises the following steps:
when the system is in an initial starting refrigeration mode or a heating mode, the initial opening degree of the electronic expansion valve is correspondingly determined according to the starting ambient temperature T4, and after the system continuously operates for a period of time at the initial opening degree, the system respectively enters the step A1 or the step A2 according to the refrigeration mode or the heating mode;
A1. during the operation of the system in a refrigeration mode, dynamically adjusting the opening degree of the electronic expansion valve based on the difference between the refrigeration return air superheat degree SH1 and a preset refrigeration target superheat degree N1, wherein the refrigeration return air superheat degree SH1 is the difference between the return air temperature TH obtained by monitoring a return air temperature probe and the inlet temperature T5 obtained by monitoring an inlet temperature probe;
A2. during the operation of the system in the heating mode, the opening degree of the electronic expansion valve is dynamically adjusted based on the difference between the heating return air superheat degree SH3 and a preset heating target superheat degree N2, wherein the heating return air superheat degree SH3 is the difference between the return air temperature probe TH and the outlet temperature T3 obtained by monitoring of the outlet temperature probe.
Further, during the system runs in a refrigeration mode under an extreme working condition, the opening degree of the electronic expansion valve is correspondingly determined based on the refrigeration exhaust superheat SH2, wherein the refrigeration exhaust superheat SH2 is the difference value between the exhaust temperature TP obtained by monitoring the exhaust temperature probe and the outlet temperature T3 obtained by monitoring the outlet temperature probe.
Further, during the system runs in the heating mode under the extreme working condition, the opening degree of the electronic expansion valve is correspondingly determined based on the heating exhaust superheat SH4, wherein the heating exhaust superheat SH4 is the difference value between the exhaust temperature TP acquired by monitoring of the exhaust temperature probe and the inlet temperature T5 acquired by monitoring of the inlet temperature probe.
Further, during the operation of step a1, the difference between the refrigerating return air superheat SH1 and the preset target refrigerating superheat N1 is obtained by calculation every 40s, and the opening degree of the electronic expansion valve is adjusted correspondingly based on the difference.
Further, five stages of refrigeration return air adjusting intervals are divided according to the difference value of the refrigeration return air superheat degree SH1 and the refrigeration target superheat degree N1, wherein the first stage of refrigeration return air adjusting interval is more than or equal to-1 and less than or equal to SH1-N1 and less than or equal to 1, and the opening degree of the electronic expansion valve is correspondingly kept unchanged; the second-stage refrigeration air return regulation interval is more than or equal to 1 and less than or equal to SH1-N1 and less than or equal to 3, and the opening of the electronic expansion valve is 8P; the third-stage refrigeration return air regulation interval is more than or equal to-3 and less than or equal to-1 of SH1-N1, and the opening degree of the electronic expansion valve is reduced by 8P; the fourth-stage refrigeration air return regulation interval is not less than 3 and is SH1-N1, and the opening of the electronic expansion valve is 16P larger; the fifth stage refrigeration return air regulation interval is SH1-N1 is less than or equal to-3, and the opening degree of the electronic expansion valve is reduced by 8P.
Further, during the operation of the step A2, the difference between the heating return air superheat degree SH3 and the heating target superheat degree N2 is obtained by calculation every 40s, and the opening degree of the electronic expansion valve is correspondingly adjusted based on the difference.
Further, five stages of heating return air adjusting intervals are divided according to the difference value between the heating return air superheat SH3 and the heating target superheat N2, wherein the first stage of heating return air adjusting interval is-1 or more and SH1 or N1 or less and 1, and the opening degree of the electronic expansion valve is correspondingly kept unchanged; the second-stage heating air return regulation interval is more than or equal to 1 and less than or equal to SH1-N1 and less than or equal to 3, and the opening of the electronic expansion valve is 8P; the third-stage heating air return regulation interval is more than or equal to-3 and less than or equal to-1 of SH1-N1, and the opening degree of the electronic expansion valve is reduced by 8P; the fourth-stage heating return air regulating interval is not less than 3 and is SH1-N1, and the opening of the electronic expansion valve is 16P; the fifth stage heating return air adjusting interval is SH1-N1 is less than or equal to-3, and the opening degree of the electronic expansion valve is reduced by 8P.
Further, the following section ranges are divided based on the refrigerating exhaust superheat SH 2: when the superheat SH2 of the refrigeration exhaust is less than 40K, the electronic expansion valve is prohibited from being opened continuously; when the refrigerating exhaust superheat SH2 is larger than 50K, prohibiting the electronic expansion valve from being continuously closed; when the refrigerating exhaust superheat SH2 is more than 40 and less than 50, the electronic expansion valve is adjusted through the refrigerating return superheat SH1, and the refrigerating exhaust superheat SH2 does not participate in adjustment control at the moment.
Further, the following section ranges are divided based on the heating exhaust superheat SH 4: when the superheat SH4 of the heating exhaust is less than 40K, the electronic expansion valve is prohibited from being opened continuously; when the superheat SH4 of the heating exhaust is larger than 50K, the electronic expansion valve is forbidden to be continuously closed; when the heating exhaust superheat SH4 is less than 40 and less than 50, the electronic expansion valve is adjusted through the heating return superheat SH3, and the heating exhaust superheat SH4 does not participate in adjustment control at the moment.
The invention adopts the scheme, and has the beneficial effects that:
1) the electronic expansion valve of the system is mainly regulated according to the refrigerating return air superheat degree and the heating return air superheat degree, the regulation speed is high, the control is accurate, the regulation range is wide, the electronic expansion valve can adapt to various different environmental working conditions and water temperatures, and the performance of the system can be maintained at a high level.
2) The opening degree adjustment of the electronic expansion valve is limited to a certain extent by introducing a heating exhaust superheat degree and a refrigerating exhaust superheat degree, wherein when the heating exhaust superheat degree or the refrigerating exhaust superheat degree is low, the exhaust temperature can be increased, and the liquid return condition of the system is ensured not to be generated; when the exhaust superheat degree of heating or the exhaust superheat degree of refrigerating is too high, the exhaust temperature is reduced, and the condition that the system is unfavorable for the operation of the compressor, such as too high exhaust or too high pressure, is prevented. The system can run in a safer range under extreme working conditions by controlling the heating exhaust superheat degree or the refrigerating exhaust superheat degree, so that the reliability of the system is greatly improved; meanwhile, under the non-extremely severe working condition, the electronic expansion valve is not involved in control, and the performance of the system is not influenced.
Drawings
Fig. 1 is a schematic connection diagram of a control system.
Fig. 2 is a flow chart of the control method.
The system comprises a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a hydraulic evaporator 4, an electronic expansion valve 5, an exhaust temperature probe 6, an air return temperature probe 7, an outlet temperature probe 8 and an inlet temperature probe 9.
Detailed Description
To facilitate an understanding of the invention, the invention is described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, in the present embodiment, an electronic valve control system suitable for a modular water machine includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a hydraulic evaporator 4, and an electronic expansion valve 5, wherein four ports of the four-way valve 2 are respectively connected to an exhaust end of the compressor 1, an air return end of the compressor 1, the outdoor heat exchanger 3, and the hydraulic evaporator 4, and two ends of the electronic expansion valve 5 are respectively connected to the outdoor heat exchanger 3 and the hydraulic evaporator 4.
In this embodiment, the system further includes an exhaust temperature probe 6 disposed at the exhaust end of the compressor 1, an air-return temperature probe 7 disposed at the air-return end of the compressor 1, an outlet temperature probe 8 disposed at the outlet of the outdoor heat exchanger 3, and an inlet temperature probe 9 disposed at the refrigerant inlet of the hydraulic evaporator 4, where the exhaust temperature probe 6TP is used for monitoring and acquiring the exhaust temperature TP, the air-return temperature probe 7 is used for monitoring and acquiring the air-return temperature TH, the outlet temperature probe 8 is used for monitoring and acquiring the outlet temperature T3, and the inlet temperature probe 9 is used for monitoring and acquiring the inlet temperature T5.
Further, during the normal operation of the system in the cooling mode, the opening degree of the electronic expansion valve 5 is dynamically adjusted based on the superheat degree SH1 of cooling return air; the opening degree of the electronic expansion valve 5 is dynamically tapped based on the superheat SH3 of the heating return air during the normal operation of the system in the heating mode. Specifically, the refrigerating return air superheat degree SH1 is the difference between the return air temperature TH obtained by monitoring by the return air temperature probe 7 and the inlet temperature T5 obtained by monitoring by the inlet temperature probe 9 (i.e., SH1= TH-T5). The heating return air superheat SH3 is the difference between the outlet temperature T3 monitored by the return air temperature probe 7TH and the outlet temperature probe 8 (i.e., SH3= TH-T3).
Referring to fig. 2, in the present embodiment, further explanation is made based on the above-described system and control method. The control method comprises the following steps: when the system is in an initial starting refrigeration mode or a heating mode, the initial opening degree of the electronic expansion valve 5 is correspondingly determined according to the starting ambient temperature T4, and after the system is continuously operated for a period of time (preferably 3 min) at the initial opening degree, the system respectively enters the step A1 or the step A2 according to the refrigeration mode or the heating mode;
A1. during the operation of the system in a refrigeration mode, dynamically adjusting the opening degree of the electronic expansion valve 5 based on the difference between the refrigeration return air superheat SH1 and a preset refrigeration target superheat N1, wherein the refrigeration return air superheat SH1 is the difference between the return air temperature TH obtained by monitoring a return air temperature probe 7 and the inlet temperature T5 obtained by monitoring an inlet temperature probe 9;
A2. during the operation of the system in the heating mode, the opening degree of the electronic expansion valve 5 is dynamically adjusted based on the difference between the heating return air superheat degree SH3 and a preset heating target superheat degree N2, wherein the heating return air superheat degree SH3 is the difference between the outlet temperature T3 monitored and obtained by the return air temperature probe 7TH and the outlet temperature probe 8.
Specifically, during the operation of step a1, the difference between the refrigerating return air superheat SH1 and the preset target refrigerating superheat N1 is calculated and obtained every 40s, and the opening degree of the electronic expansion valve 5 is correspondingly adjusted based on the difference, that is, the monitoring judgment is performed every 40s and the electronic expansion valve 5 is correspondingly adjusted.
Further, five stages of refrigeration return air adjusting intervals are divided according to the difference value between the refrigeration return air superheat degree SH1 and the refrigeration target superheat degree N1, wherein the first stage of refrigeration return air adjusting interval is more than or equal to-1 and less than or equal to SH1-N1 and less than or equal to 1, and the opening degree of the electronic expansion valve 5 is correspondingly kept unchanged; the second-stage refrigeration air return regulation interval is more than or equal to 1 and less than or equal to SH1-N1 and less than or equal to 3, and the opening of the electronic expansion valve 5 is 8P; the third-stage refrigeration return air regulation interval is more than or equal to-3 and less than or equal to-1 of SH1-N1, and the opening degree of the electronic expansion valve 5 is reduced by 8P; the fourth-stage refrigeration air return regulation interval is not less than 3 and is SH1-N1, and the opening of the electronic expansion valve 5 is 16P; the fifth stage refrigeration return air regulation interval is SH1-N1 is less than or equal to-3, and the opening degree of the electronic expansion valve 5 is reduced by 8P.
In this embodiment, the general operating condition of the electronic expansion valve 5 of the system operates the refrigeration mode mainly according to the superheat degree of returned cooling air, but the problem that the operation reliability of the unit is affected by the excessive liquid return or pressure discharge may occur when the system operates the refrigeration mode under the extreme operating condition, so that to avoid this problem, the opening degree of the electronic expansion valve 5 needs to be correspondingly determined according to the preset superheat degree of discharged cooling air SH 2. Specifically, during the refrigeration mode of the system under the extreme working condition, the opening degree of the electronic expansion valve 5 is correspondingly determined based on the refrigeration exhaust superheat SH2, wherein the refrigeration exhaust superheat SH2 is the difference between the exhaust temperature TP monitored by the exhaust temperature probe 6 and the outlet temperature T3 monitored by the outlet temperature probe 8 (i.e., SH2= TP-T3).
Further, during the operation of the system, the control of the refrigerating exhaust superheat SH2 in the range of 40-50K is considered to be reliable, so that the following interval ranges are divided based on the refrigerating exhaust superheat SH 2: when the refrigerating exhaust superheat SH2 is less than 40K, the electronic expansion valve 5 is prohibited from being opened continuously; when the refrigerating exhaust superheat SH2 is larger than 50K, prohibiting the electronic expansion valve 5 from being continuously closed; when the refrigerating exhaust superheat SH2 is more than 40 and less than 50, the electronic expansion valve 5 is adjusted through the refrigerating return superheat SH1, and the refrigerating exhaust superheat SH2 does not participate in adjustment control at the moment.
In the present embodiment, during the operation of step a2, the difference between the heating return air superheat SH3 and the heating target superheat N2 is obtained every 40s, and the opening degree of the electronic expansion valve 5 is adjusted accordingly based on the difference. Dividing five heating return air adjusting intervals according to the difference value of the heating return air superheat SH3 and the heating target superheat N2, wherein the first heating return air adjusting interval is-1 or more and SH1 or N1 or less and 1, and the opening degree of the electronic expansion valve 5 is correspondingly kept unchanged; the second-stage heating air-return regulating interval is more than or equal to 1 and less than or equal to SH1-N1 and less than or equal to 3, and the opening of the electronic expansion valve 5 is 8P; the third-stage heating air return regulation interval is more than or equal to-3 and less than or equal to-1 of SH1-N1, and the opening degree of the electronic expansion valve 5 is reduced by 8P; the fourth-stage heating return air regulating interval is not less than 3 and is SH1-N1, and the opening of the electronic expansion valve 5 is 16P; the fifth stage heating return air adjusting interval is SH1-N1 is less than or equal to-3, and the opening degree of the electronic expansion valve 5 is reduced by 8P.
In this embodiment, the general operating mode and the heating mode of the electronic expansion valve 5 of the system are mainly adjusted according to the superheat degree of heating return air, but when the electronic expansion valve 5 operates in the heating mode under the extreme operating condition, some problems that the operation reliability of the unit is affected, such as liquid return or too low exhaust pressure, may occur, and therefore, during the system operates in the heating mode under the extreme operating condition, the opening degree of the electronic expansion valve 5 is correspondingly determined based on the superheat degree of heating exhaust air SH4, where the superheat degree of heating exhaust air SH4 is the difference between the exhaust air temperature TP monitored by the exhaust air temperature probe 6 and the inlet temperature T5 monitored by the inlet air temperature probe 9 (i.e., SH4= TP-T5). Specifically, the following range of intervals is divided based on the heating exhaust superheat SH 4: when the superheat SH4 of the heating exhaust is less than 40K, the electronic expansion valve 5 is prohibited from being opened continuously; when the superheat SH4 of the heating exhaust is larger than 50K, the electronic expansion valve 5 is forbidden to be continuously closed; when the heating exhaust superheat SH4 is less than 40 and less than 50, the electronic expansion valve 5 is adjusted through the heating return superheat SH3, and the heating exhaust superheat SH4 does not participate in adjustment control at the moment.
In addition, in either the heating mode or the cooling mode, when the exhaust temperature TP > 105 ℃ is monitored in real time, the electronic expansion valve 5 is forcibly opened to the maximum opening degree.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent changes made according to the spirit of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.
Claims (10)
1. An electronic valve control system suitable for a modular water machine comprises a compressor (1), a four-way valve (2), an outdoor heat exchanger (3), a hydraulic evaporator (4) and an electronic expansion valve (5), wherein four interfaces of the four-way valve (2) are respectively connected with an exhaust end of the compressor (1), a gas return end of the compressor (1), the outdoor heat exchanger (3) and the hydraulic evaporator (4), and two ends of the electronic expansion valve (5) are respectively connected with the outdoor heat exchanger (3) and the hydraulic evaporator (4); the method is characterized in that: the system also comprises an exhaust temperature probe (6) arranged at the exhaust end of the compressor (1), an air return temperature probe (7) arranged at the air return end of the compressor (1), an outlet temperature probe (8) arranged at the outlet position of the outdoor heat exchanger (3) and an inlet temperature probe (9) arranged at the refrigerant inlet position of the hydraulic evaporator (4), wherein the opening degree of the electronic expansion valve (5) is dynamically adjusted based on the refrigerating air return superheat degree SH1 during the normal operation period of the system in a refrigeration mode; during the normal operation of the system in the heating mode, the opening degree of the electronic expansion valve (5) is dynamically connected on the basis of the heating return air superheat SH3, wherein the refrigerating return air superheat SH1 is the difference value between the return air temperature TH obtained by monitoring a return air temperature probe (7) and the inlet temperature T5 obtained by monitoring an inlet temperature probe (9); and the heating return air superheat SH3 is the difference value of the outlet temperature T3 obtained by monitoring the return air temperature probe (7) TH and the outlet temperature probe (8).
2. An electronic valve control method for a modular water machine as claimed in claim 1, characterized in that: the method comprises the following steps:
when the system is in an initial starting refrigeration mode or a heating mode, the initial opening degree of the electronic expansion valve (5) is correspondingly determined according to the starting ambient temperature T4, and after the system continuously operates for a period of time at the initial opening degree, the system respectively enters the step A1 or the step A2 according to the refrigeration mode or the heating mode;
A1. during the operation of the system in a refrigeration mode, dynamically adjusting the opening degree of an electronic expansion valve (5) based on the difference between a refrigeration return air superheat degree SH1 and a preset refrigeration target superheat degree N1, wherein the refrigeration return air superheat degree SH1 is the difference between a return air temperature TH obtained by monitoring a return air temperature probe (7) and an inlet temperature T5 obtained by monitoring an inlet temperature probe (9);
A2. during the operation of the system in a heating mode, the opening degree of the electronic expansion valve (5) is dynamically adjusted based on the difference between the heating return air superheat degree SH3 and a preset heating target superheat degree N2, wherein the heating return air superheat degree SH3 is the difference between the return air temperature probe (7) TH and the outlet temperature probe (8) monitored and obtained outlet temperature T3.
3. The electronic valve control method for the modular water machine as claimed in claim 2, wherein: during the operation of the system in a refrigeration mode under an extreme working condition, the opening degree of the electronic expansion valve (5) is correspondingly determined based on the refrigeration exhaust superheat SH2, wherein the refrigeration exhaust superheat SH2 is the difference value between the exhaust temperature TP obtained by monitoring of the exhaust temperature probe (6) and the outlet temperature T3 obtained by monitoring of the outlet temperature probe (8).
4. The electronic valve control method for the modular water machine as claimed in claim 2, wherein: during the operation of the system in a heating mode under an extreme working condition, the opening degree of the electronic expansion valve (5) is correspondingly determined based on the superheat SH4 of heating exhaust gas, wherein the superheat SH4 of the heating exhaust gas is the difference between the exhaust gas temperature TP obtained by monitoring of the exhaust gas temperature probe (6) and the inlet temperature T5 obtained by monitoring of the inlet temperature probe (9).
5. The electronic valve control method for the modular water machine as claimed in claim 2, wherein: during the operation of the step A1, the difference between the refrigerating return air superheat SH1 and the preset target refrigerating superheat N1 is obtained by calculation every 40s, and the opening degree of the electronic expansion valve (5) is correspondingly adjusted based on the difference.
6. The electronic valve control method for the modular water machine as claimed in claim 5, wherein: dividing a five-stage refrigeration return air regulation interval according to the difference value of the refrigeration return air superheat SH1 and a refrigeration target superheat degree N1, wherein the first-stage refrigeration return air regulation interval is more than or equal to SH1 and less than or equal to N1 and is less than or equal to 1, and the opening degree of the electronic expansion valve (5) is correspondingly kept unchanged; the second-stage refrigeration air return regulation interval is more than or equal to 1 and less than or equal to SH1-N1 and less than or equal to 3, and the opening of the electronic expansion valve (5) is 8P larger; the third-stage refrigeration return air regulation interval is more than or equal to-3 and less than or equal to-1 of SH1-N1, and the opening degree of the electronic expansion valve (5) is reduced by 8P; the fourth-stage refrigeration air return regulation interval is more than or equal to 3 and is SH1-N1, and the opening of the electronic expansion valve (5) is 16P larger; the fifth stage refrigeration return air regulation interval is SH1-N1 is less than or equal to-3, and the opening degree of the electronic expansion valve (5) is reduced by 8P.
7. The electronic valve control method for the modular water machine as claimed in claim 2, wherein: during the operation of the step A2, the difference between the superheat SH3 of the returned air for heating and the target superheat N2 for heating is obtained by calculation every 40s, and the opening degree of the electronic expansion valve (5) is correspondingly adjusted based on the difference.
8. The electronic valve control method for the modular water machine as claimed in claim 7, wherein: dividing five heating return air adjusting intervals according to the difference value of the heating return air superheat SH3 and the heating target superheat N2, wherein the first heating return air adjusting interval is-1 or more and SH1 or N1 or less and 1, and the opening degree of the electronic expansion valve (5) is correspondingly kept unchanged; the second-stage heating air return regulation interval is more than or equal to 1 and less than or equal to SH1-N1 and less than or equal to 3, and the opening of the electronic expansion valve (5) is 8P larger; the third-stage heating air return regulation interval is more than or equal to-3 and less than or equal to-1 of SH1-N1, and the opening degree of the electronic expansion valve (5) is reduced by 8P; the fourth-stage heating return air adjusting interval is more than or equal to 3 and is SH1-N1, and the opening of the electronic expansion valve (5) is 16P larger; the fifth stage heating return air adjusting interval is SH1-N1 is less than or equal to-3, and the opening degree of the electronic expansion valve (5) is reduced by 8P.
9. The electronic valve control method for the modular water machine as claimed in claim 3, wherein: the following interval ranges are divided based on the refrigerating exhaust superheat SH 2: when the refrigerating exhaust superheat SH2 is less than 40K, the electronic expansion valve (5) is prohibited from being opened continuously; when the refrigerating exhaust superheat SH2 is larger than 50K, prohibiting the electronic expansion valve (5) from being continuously closed; when the refrigerating exhaust superheat SH2 is more than 40 and less than 50, the electronic expansion valve (5) is adjusted through the refrigerating return superheat SH1, and the refrigerating exhaust superheat SH2 does not participate in adjustment control at the moment.
10. The electronic valve control method for the modular water machine as claimed in claim 4, wherein: the following section ranges are divided based on the heating exhaust superheat SH 4: when the superheat SH4 of the heating exhaust is less than 40K, the electronic expansion valve (5) is prohibited from being opened continuously; when the superheat SH4 of the heating exhaust is larger than 50K, the electronic expansion valve (5) is forbidden to be closed continuously; when the heating exhaust superheat SH4 is less than 40 and less than 50, the electronic expansion valve (5) is adjusted through the heating return superheat SH3, and the heating exhaust superheat SH4 does not participate in adjustment control at the moment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113686065A (en) * | 2021-07-21 | 2021-11-23 | 广东芬尼克兹节能设备有限公司 | Method and device for adjusting opening of electronic expansion valve |
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