CN116136342A - Electronic expansion valve opening degree adjusting method and device, controller and heat pump host - Google Patents
Electronic expansion valve opening degree adjusting method and device, controller and heat pump host Download PDFInfo
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- CN116136342A CN116136342A CN202310168768.9A CN202310168768A CN116136342A CN 116136342 A CN116136342 A CN 116136342A CN 202310168768 A CN202310168768 A CN 202310168768A CN 116136342 A CN116136342 A CN 116136342A
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- 238000000034 method Methods 0.000 title claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 45
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 5
- 239000003507 refrigerant Substances 0.000 description 10
- 230000003247 decreasing effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/26—Disposition of valves, e.g. of on-off valves or flow control valves of fluid flow reversing valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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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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- Fluid Mechanics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a method and a device for adjusting the opening of an electronic expansion valve, a controller and a heat pump host. The invention discloses an electronic expansion valve opening degree adjusting method, which comprises the following steps: s1: after the heat pump unit stably operates, acquiring initial output capacity Q1 of the heat pump unit; s2: acquiring the adjusting direction and the adjusting quantity of the electronic expansion valve, and adjusting the opening of the electronic expansion valve according to the adjusting direction and the adjusting quantity; s3: after the heat pump unit stably operates, acquiring the real-time output capacity Q2 of the heat pump unit; s4: comparing the output capacity change of the heat pump unit before and after the adjustment, and repeating the steps S2-S3 until the output capacity after the adjustment is not more than the output capacity before the adjustment if the output capacity after the adjustment is more than the output capacity before the adjustment. The opening degree adjusting method of the electronic expansion valve can reduce the output range of the heat pump unit during stable operation, and further achieve the optimal output capacity of the heat pump unit.
Description
Technical Field
The invention relates to the technical field of heat pump systems, in particular to an electronic expansion valve opening degree adjusting method, an electronic expansion valve opening degree adjusting device, a controller and a heat pump host.
Background
The heat pump system forms an indispensable part of modern life, and the demands in important civil engineering such as refrigeration, heating, domestic hot water supply and the like are continuously increasing. However, in the conventional heat pump system, the output capacity of the heat pump unit is a certain range and is almost entirely determined by the refrigerant circulation flow rate of the unit under the condition that key parts thereof are confirmed. The circulation flow of the refrigerant is controlled by an electronic expansion valve in the unit, and the conventional control method can only enable the heat pump unit to fluctuate within a certain output range, so that the optimal output capacity value of the unit can not be reached.
Disclosure of Invention
Accordingly, the invention aims to provide a method and a device for adjusting the opening of an electronic expansion valve, a controller and a heat pump host, which can reduce the output range of a heat pump unit during stable operation and further achieve the optimal output capacity of the heat pump unit.
According to a first aspect of some embodiments of the present application, there is provided an electronic expansion valve opening degree adjustment method, including the steps of:
s1: after the heat pump unit stably operates, acquiring initial output capacity Q1 of the heat pump unit;
s2: acquiring the adjusting direction and the adjusting quantity of the electronic expansion valve, and adjusting the opening of the electronic expansion valve according to the adjusting direction and the adjusting quantity;
s3: after the heat pump unit stably operates, acquiring the real-time output capacity Q2 of the heat pump unit;
s4: comparing the output capacity change of the heat pump unit before and after the adjustment, and repeating the steps S2-S3 until the output capacity after the adjustment is not more than the output capacity before the adjustment if the output capacity after the adjustment is more than the output capacity before the adjustment.
Further, in step S4, after repeating steps S2 to S3, if the output capacity after adjustment is smaller than the output capacity before adjustment, the electronic expansion valve is controlled to operate at the opening degree before adjustment.
Further, in step S4, the output capacity change of the heat pump unit before and after the adjustment is compared, and if the adjusted output capacity is smaller than the output capacity before the adjustment, the method further includes the steps of:
s6: adjusting the opening value of the electronic expansion valve according to the opposite direction of the adjusting direction and the adjusting amount;
s7: after the heat pump unit stably operates, acquiring the real-time output capacity Q3 of the heat pump unit;
s8: comparing the output capacity change of the heat pump unit before and after the adjustment, and repeating the steps S6-S7 until the output capacity after the adjustment is not more than the output capacity before the adjustment if the output capacity after the adjustment is more than the output capacity before the adjustment.
Further, in step S8, after repeating steps S6 to S7, if the output capacity after adjustment is smaller than the output capacity before adjustment, the electronic expansion valve is controlled to operate at the opening degree before adjustment.
Further, in step S2, the step of obtaining the adjustment direction of the electronic expansion valve includes:
acquiring the exhaust temperature and the outlet water temperature of the heat pump unit;
calculating a difference between the exhaust temperature and the outlet water temperature;
when the difference value is larger than a set threshold value, the direction in which the opening of the electronic expansion valve is increased is taken as the adjusting direction;
and when the difference value is smaller than a set threshold value, taking the direction in which the opening of the electronic expansion valve is reduced as the adjusting direction.
Further, the output capacity Q of the heat pump unit is calculated based on the following formula:
Q＝L*(T1-T2)*f
wherein L is the real-time water flow of the heat pump unit, T1 is the water inlet temperature of the heat pump unit, T2 is the water outlet temperature of the heat pump unit, and f is the regulating factor;
the adjustment coefficient f is 1.1-1.2.
Further, acquiring the operation parameters of the heat pump unit, and judging that the heat pump unit stably operates when the operation parameters are stable;
wherein the operating parameters include at least one of:
the operation frequency of the heat pump unit, the rotating speed of the fan and the opening of the electronic expansion valve.
According to a second aspect of some embodiments of the present application, there is provided an electronic expansion valve opening degree adjustment device, including:
the initial capacity acquisition module is used for acquiring initial output capacity Q1 of the heat pump unit after the heat pump unit stably operates;
the adjusting opening determining module is used for obtaining the adjusting direction and the adjusting quantity of the electronic expansion valve and adjusting the opening of the electronic expansion valve according to the adjusting direction and the adjusting quantity;
the real-time capacity acquisition module is used for acquiring the real-time output capacity Q2 of the heat pump unit after the heat pump unit stably operates;
and the capacity change comparison module is used for comparing the output capacity change of the heat pump unit before and after adjustment, and if the output capacity after adjustment is larger than the output capacity before adjustment, the adjustment steps of the adjustment opening determining module and the real-time capacity obtaining module are repeatedly executed until the output capacity after adjustment is not larger than the output capacity before adjustment.
According to a third aspect of some embodiments of the present application, there is provided a controller comprising:
at least one memory and at least one processor;
the memory is used for storing one or more programs;
when the one or more programs are executed by the at least one processor, the at least one processor is caused to implement the steps of a method for controlling a heat pump unit according to any one of the first aspects.
According to a fourth aspect of some embodiments of the present application, there is provided a heat pump host comprising a controller as described in the third aspect above.
According to the electronic expansion valve opening adjusting method, the electronic expansion valve opening adjusting device, the controller and the heat pump host, after the heat pump system stably operates, accurate adjustment of the electronic expansion valve is performed, output capacity changes before and after adjustment are compared, and adjustment is repeated until the optimal output capacity of the heat pump unit is obtained and stable output is kept. According to the method and the device, the adjustment direction of the heat pump unit is primarily judged by comparing the difference between the exhaust temperature and the water outlet temperature, so that the optimal output capacity of the heat pump unit can be quickly obtained, and stable output is maintained. In addition, when the operation parameters of the heat pump unit and external conditions are changed, the method can start the readjustment of the opening degree to adapt to the change, and has flexibility.
For a better understanding and implementation, the present invention is described in detail below with reference to the drawings.
Drawings
Fig. 1 is a schematic step diagram of a method for adjusting an opening of an electronic expansion valve according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for adjusting the opening of an electronic expansion valve according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for adjusting the opening of an electronic expansion valve according to an embodiment of the present invention;
fig. 4 is a schematic block diagram of an electronic expansion valve opening adjusting device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a heat pump host according to an embodiment of the present invention.
Reference numerals:
1. a compressor; 2. a plate heat exchanger; 3. an electronic expansion valve; 4. a fin heat exchanger; 5. a four-way reversing valve; 6. a water outlet temperature sensor; 7. a water inlet temperature sensor; 8. a water flow meter; 9. an exhaust gas temperature sensor.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the following detailed description of the embodiments of the present application will be given with reference to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the embodiments of the present application, are within the scope of the embodiments of the present application.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims. In the description of this application, it should be understood that the terms "first," "second," "third," and the like are used merely to distinguish between similar objects and are not necessarily used to describe a particular order or sequence, nor should they be construed to indicate or imply relative importance. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
Furthermore, in the description of the present application, unless otherwise indicated, "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
Aiming at the technical problems mentioned in the background art, the conventional control method is generally controlled by fixed-point opening, or by exhaust superheat degree or return superheat degree, but is only a relatively extensive control method, and the electronic expansion valve opening adjusting method provided by the embodiment of the application can realize accurate adjustment of the opening of the electronic expansion valve, so that the heat pump unit achieves an optimal output capacity value and keeps stable output.
The electronic expansion valve opening degree adjusting method provided by the embodiment of the application can be executed by electronic expansion valve opening degree adjusting equipment in the heat pump unit, wherein the electronic expansion valve opening degree adjusting equipment can be a controller of the heat pump unit, and the electronic expansion valve can be an electromagnetic electronic expansion valve or an electric electronic expansion valve.
As shown in fig. 1, fig. 1 is a schematic step diagram of an electronic expansion valve opening adjusting method according to an embodiment of the present application, where the method includes the following steps:
s1: after the heat pump unit stably operates, the initial output capacity Q1 of the heat pump unit is obtained.
The stable operation of the heat pump unit means that the operation parameters of all operation components in the heat pump unit reach a stable operation state, such as fixed operation frequency of the heat pump unit, stable rotation speed of a fan, fixed opening degree of an electronic expansion valve and the like, when one or more operation parameters are detected to meet the requirements, the stable operation of the heat pump unit can be considered, at the moment, the output capacity can be considered to be a stable value, the initial output capacity Q1 of the heat pump unit is acquired, and the heat pump unit is required to reach the stable operation state when the output capacity of the heat pump unit is acquired each time.
Specifically, before step S1, ensuring stable operation of the heat pump unit, further includes:
and acquiring the operation parameters of the heat pump unit, and judging that the heat pump unit stably operates when the operation parameters are stable.
S2: and acquiring the adjusting direction and the adjusting quantity of the electronic expansion valve, and adjusting the opening of the electronic expansion valve according to the adjusting direction and the adjusting quantity.
The adjusting direction of the electronic expansion valve refers to the direction of increasing or decreasing the opening of the electronic expansion valve through adjustment, so that the flow rate of the refrigerant in the refrigerant pipeline is changed, and when the direction of increasing the opening of the electronic expansion valve is taken as the adjusting direction, the flow rate of the refrigerant in the refrigerant pipeline is increased; when the opening degree reducing direction of the electronic expansion valve is taken as the adjusting direction, the refrigerant flow in the refrigerant pipeline is reduced.
The adjustment amount is a change value of the opening of the electronic expansion valve after adjustment compared with the opening of the electronic expansion valve before adjustment, and the electronic expansion valve is adjusted in the adjustment direction of the electronic expansion valve based on the change value.
Optionally, when the electronic expansion valve is an electric electronic expansion valve, the electric electronic expansion valve changes the opening of the valve body according to the number of steps of controlling the stepping motor, so that the opening of the electronic expansion valve can be finely adjusted by taking N steps as adjusting amplitude, wherein N is a positive number constant; when the electronic expansion valve is an electromagnetic electronic expansion valve, the electromagnetic electronic expansion valve changes the opening of the valve body according to the received control signal, so that the opening of the valve body can be changed by changing the voltage or current applied to an electromagnetic coil in the electronic expansion valve to cause the electromagnetic force applied to a plunger made of a magnetic material to change.
In other examples, the adjustment amount may be a variable amount, for example, a variable value set according to the opening degree of the electronic expansion valve, or when the output capacity is changed relatively large, the adjustment amount is increased, and the change is decreased accordingly, or as the adjustment number increases, the adjustment amount of the electronic expansion valve is decreased, so that the output capacity of the heat pump unit is closer to the optimal output capacity.
S3: after the heat pump unit stably operates, acquiring the real-time output capacity Q2 of the heat pump unit;
s4: comparing the output capacity change of the heat pump unit before and after the adjustment, and repeating the steps S2-S3 until the output capacity after the adjustment is not more than the output capacity before the adjustment if the output capacity after the adjustment is more than the output capacity before the adjustment.
When the heat pump unit reaches a stable state, the electronic expansion valve is controlled to conduct opening adjustment according to the initially judged adjustment direction and the determined adjustment quantity, when the adjusted heat pump unit reaches the stable state again, the initial output capacity Q1 and the real-time output capacity Q2 are compared, if the adjusted real-time output capacity Q2 is larger than the initial output capacity Q1 before adjustment, the heat pump unit is judged to not reach the optimal output capacity, and the opening of the electronic expansion valve is adjusted according to the adjustment direction, so that the heat pump unit can achieve better output.
Based on this, the steps S2-S3 are repeated to realize the homodromous adjustment of the electronic expansion valve until the output capacity after adjustment is not greater than the output capacity before adjustment, that is, the output capacity after adjustment is less than or equal to the output capacity before adjustment, and it is understood that continuing to perform the homodromous adjustment may result in a decrease in the output capacity of the heat pump unit, and therefore, it is necessary to stop performing the homodromous adjustment of the electronic expansion valve.
In one example, when the above-mentioned equidirectional adjustment of the electronic expansion valve is performed until the adjusted output capacity is not greater than the output capacity before adjustment, the method further includes:
in step S4, after repeating steps S2-S3, if the output capacity after adjustment is smaller than the output capacity before adjustment, the electronic expansion valve is controlled to operate at the opening degree before adjustment.
When the output capacity after adjustment is equal to the output capacity before adjustment, since the adjustment amount is a fixed value in this embodiment, when other conditions are not changed, it may be determined that the output capacities corresponding to the two openings of the electronic expansion valve are identical, and the electronic expansion valve may not be readjusted. However, when the output capacity after adjustment is smaller than the output capacity before adjustment, the electronic expansion valve is controlled to operate at the opening before adjustment, namely, the opening of the electronic expansion valve is adjusted by an adjustment amount in the opposite direction of the adjustment direction, and the opening of the electronic expansion valve is locked, so that the heat pump unit operates at a better output capacity and keeps stable output.
In one example, when the initially determined adjustment direction of the heat pump unit is such that the real-time output capacity Q2 is smaller than the initial output capacity Q1, that is, in step S4, the output capacity change of the heat pump unit before and after adjustment is compared, and if the adjusted output capacity is smaller than the output capacity before adjustment, the method further includes the steps of:
s6: adjusting the opening value of the electronic expansion valve according to the opposite direction of the adjusting direction and the adjusting amount;
s7: after the heat pump unit stably operates, acquiring the real-time output capacity Q3 of the heat pump unit;
s8: comparing the output capacity change of the heat pump unit before and after the adjustment, and repeating the steps S6-S7 until the output capacity after the adjustment is not more than the output capacity before the adjustment if the output capacity after the adjustment is more than the output capacity before the adjustment.
When the initially determined adjustment direction of the heat pump unit makes the real-time output capacity Q2 smaller than the initial output capacity Q1, it may be determined that the initially determined adjustment direction is a direction that causes deterioration of the heat pump output capacity, and the heat pump output capacity may be increased only by adjusting the adjustment direction in the opposite direction.
In one example, when the electronic expansion valve is reversely adjusted until the adjusted output capacity is not greater than the output capacity before adjustment, the method further includes:
in step S8, after repeating steps S6 to S7, if the output capacity after adjustment is smaller than the output capacity before adjustment, the electronic expansion valve is controlled to operate at the opening degree before adjustment.
In one example, in step S2, the acquiring the adjustment direction of the electronic expansion valve includes:
acquiring the exhaust temperature and the outlet water temperature of the heat pump unit;
calculating a difference between the exhaust temperature and the outlet water temperature;
when the difference value is larger than a set threshold value, the direction in which the opening of the electronic expansion valve is increased is taken as the adjusting direction;
and when the difference value is smaller than a set threshold value, taking the direction in which the opening of the electronic expansion valve is reduced as the adjusting direction.
The exhaust temperature of the heat pump unit is the exhaust temperature of a compressor in the heat pump unit, the outlet temperature is the outlet pipeline temperature of a plate heat exchanger in the heat pump unit, and the adjustment direction of the electronic expansion valve is primarily judged by detecting the difference between the exhaust temperature and the outlet temperature. When the difference value is larger than a set threshold value, taking the direction of increasing the opening of the electronic expansion valve as an initial adjusting direction; and when the difference value is smaller than the set threshold value, taking the direction of reducing the opening of the electronic expansion valve as the initial adjusting direction.
After determining the adjusting direction of the electronic expansion valve, executing the adjusting method of the steps S1-S4, and when the real-time output capacity Q2 is larger than the initial output capacity Q1, primarily judging that the adjusting direction is the adjusting direction capable of optimizing the output capacity of the heat pump unit; when the real-time output capacity Q2 is smaller than the initial output capacity Q1, the adjustment direction is determined to be wrong preliminarily, and the adjustment direction is an adjustment direction capable of deteriorating the output capacity of the heat pump unit, and the adjustment method of steps S6 to S8 is required to be executed to perform the opposite adjustment of the adjustment direction.
In a specific example, the output capacity Q of the heat pump unit is calculated based on the following formula:
Q＝L*(T1-T2)*f
wherein L is the real-time water flow of the heat pump unit, T1 is the water inlet temperature of the heat pump unit, T2 is the water outlet temperature of the heat pump unit, and f is the regulating factor; the adjustment coefficient f is 1.1-1.2.
In addition, even if the heat pump unit has completed the opening adjustment of the electronic expansion valve, the opening of the electronic expansion valve is locked, and after the heat pump unit is stably operated at the current opening, when the external condition of the heat pump unit is changed, the performance of the heat pump system is also changed, so that the locking of the electronic expansion valve needs to be released, and after the heat pump unit is stabilized again, the adjustment step of the electronic expansion valve is restarted, so that the opening of the electronic expansion valve is redetermined to adapt to the current external condition. The external conditions can include ambient temperature, whether the external conditions change can be directly judged by detecting the ambient temperature, and whether the external conditions change can be indirectly judged by detecting operation parameters of the heat pump unit, such as operation frequency of the heat pump unit, rotation speed of a fan, opening degree of an electronic expansion valve, water inlet and outlet temperature and the like.
In a specific application scenario, as shown in fig. 1 and 2, in the method for adjusting the opening of the electronic expansion valve, after confirming that the heat pump unit enters a stable state, initial output capacity Q1 of the heat pump unit is obtained; then preliminarily judging the adjusting direction through the exhaust temperature and the water outlet temperature, and adjusting the opening of the electronic expansion valve by taking the adjusting quantity N as a reference after determining the adjusting direction; after the heat pump unit stably operates, the real-time output capacity Q2 of the heat pump unit is obtained, and the change of the output capacities of the heat pump unit before and after adjustment is compared.
When Q2 is larger than Q1, the primarily judged adjusting direction is the direction for increasing the output capacity of the heat pump unit, and the same-direction adjustment taking the adjusting quantity N as a reference is continuously carried out until the output capacity after adjustment is not larger than the output capacity before adjustment, and the electronic expansion valve is controlled to operate at the opening before adjustment, namely, the opening of the electronic expansion valve is adjusted by taking the opposite direction of the adjusting direction and one adjusting quantity N as a reference. At this time, the heat pump unit reaches the optimal output capacity, and the opening of the electronic expansion valve is increased and decreased in the direction of decreasing the output capacity of the heat pump unit.
As shown in fig. 3, when Q2 is smaller than Q1, the initially determined adjustment direction is a direction for reducing the output capacity of the heat pump unit, then the opening of the electronic expansion valve is adjusted based on the opposite direction of the adjustment direction and the adjustment amount N, when the heat pump unit stably operates, the real-time output capacity Q3 of the heat pump unit is obtained, and the reverse adjustment based on the adjustment amount N is continuously performed until the adjusted output capacity is not greater than the output capacity before adjustment, at this time, the electronic expansion valve is controlled to operate at the opening before adjustment, at this time, the heat pump unit reaches the optimal output capacity, and the directions for increasing and decreasing the opening of the electronic expansion valve are both directions for reducing the output capacity of the heat pump unit.
Corresponding to the above-mentioned method for adjusting the opening of the electronic expansion valve, the present application further provides an electronic expansion valve opening adjusting device, as shown in fig. 4, fig. 4 is a schematic block diagram of the electronic expansion valve opening adjusting device provided by the present invention, where the device 400 includes:
an initial capacity obtaining module 401, configured to obtain an initial output capacity Q1 of a heat pump unit after the heat pump unit stably operates;
an adjustment opening determining module 402, configured to obtain an adjustment direction and an adjustment amount of the electronic expansion valve, and adjust an opening of the electronic expansion valve according to the adjustment direction and the adjustment amount;
a real-time capability obtaining module 403, configured to obtain a real-time output capability Q2 of the heat pump unit after the heat pump unit stably operates;
and the capacity change comparing module 404 is configured to compare the output capacity change of the heat pump unit before and after the adjustment, and if the adjusted output capacity is greater than the output capacity before the adjustment, repeatedly execute the adjustment steps of the adjustment opening determining module and the real-time capacity obtaining module until the adjusted output capacity is not greater than the output capacity before the adjustment.
In an alternative embodiment, the capability change comparison module 404 of the apparatus further includes:
and the control operation unit is used for repeatedly executing the adjusting steps of the opening degree adjusting determining module and the real-time capacity acquiring module, and controlling the electronic expansion valve to operate at the opening degree before the adjustment if the output capacity after the adjustment is smaller than the output capacity before the adjustment.
In an alternative embodiment, the capability change comparison module 404 of the apparatus further includes:
a reverse adjustment unit for adjusting the opening value of the electronic expansion valve in a direction opposite to the adjustment direction and the adjustment amount;
the real-time capacity acquisition unit is used for acquiring the real-time output capacity Q3 of the heat pump unit after the heat pump unit stably operates;
and the second capacity comparison unit is used for comparing the output capacity change of the heat pump unit before and after the regulation, and if the regulated output capacity is larger than the output capacity before the regulation, the regulation steps of the reverse regulation unit and the real-time capacity acquisition unit are repeatedly executed until the regulated output capacity is not larger than the output capacity before the regulation.
In an alternative embodiment, the capability change comparison module 404 of the apparatus further includes:
and the second control operation unit is used for controlling the electronic expansion valve to operate at the opening before the adjustment if the output capacity after the adjustment is smaller than the output capacity before the adjustment after the adjustment steps of the reverse adjustment unit and the real-time capacity acquisition unit are repeatedly executed.
In an alternative embodiment, the adjusting opening determining module 402 of the apparatus further includes:
the temperature acquisition unit is used for acquiring the exhaust temperature and the outlet water temperature of the heat pump unit;
a difference calculating unit for calculating a difference between the exhaust temperature and the outlet water temperature;
an adjustment direction confirmation unit configured to, when the difference is greater than a set threshold, take a direction in which the opening of the electronic expansion valve increases as the adjustment direction; the method comprises the steps of,
and when the difference value is smaller than a set threshold value, taking the direction in which the opening of the electronic expansion valve is reduced as the adjusting direction.
In an alternative embodiment, the apparatus 400 further comprises:
the output capacity calculating module is used for calculating the output capacity Q of the heat pump unit based on the following formula:
Q＝L*(T1-T2)*f
wherein L is the real-time water flow of the heat pump unit, T1 is the water inlet temperature of the heat pump unit, T2 is the water outlet temperature of the heat pump unit, and f is the regulating factor;
the adjustment coefficient f is 1.1-1.2.
In an alternative embodiment, the apparatus 400 further comprises:
the operation parameter acquisition module is used for acquiring the operation parameters of the heat pump unit and judging that the heat pump unit stably operates when the operation parameters are stable;
wherein the operating parameters include at least one of:
the operation frequency of the heat pump unit, the rotating speed of the fan and the opening of the electronic expansion valve.
For the device embodiments, reference is made to the description of the method embodiments for the relevant points, since they essentially correspond to the method embodiments. The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements. It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
Corresponding to the above-mentioned method for adjusting the opening of the electronic expansion valve, the embodiment of the application further provides a controller for adjusting the opening of the electronic expansion valve, which includes:
at least one memory and at least one processor;
the memory is used for storing one or more programs;
the one or more programs, when executed by the at least one processor, cause the at least one processor to implement the steps of a method for electronic expansion valve opening adjustment as described in any of the embodiments above.
Corresponding to the above-mentioned method for adjusting the opening of the electronic expansion valve, the embodiment of the present application further provides a heat pump host, which includes a controller as described in the above-mentioned embodiment.
Specifically, as shown in fig. 5, the heat pump host further comprises a compressor 1, a plate heat exchanger 2, an electronic expansion valve 3 and a fin heat exchanger 4 which are sequentially connected through refrigerant pipelines, and a four-way reversing valve 5 is arranged between the compressor 1 and the plate heat exchanger 2 and between the compressor 1 and the fin heat exchanger 4, so that the circulation direction of a refrigerant in the pipelines can be changed by changing the communication direction of the four-way reversing valve 5, and the heat pump unit can be switched among refrigeration, dehumidification and heating modes.
The heat pump host also comprises a water outlet temperature sensor 6, a water inlet temperature sensor 7, a water flowmeter 8, an exhaust temperature sensor 9 and an environment temperature sensor, wherein the water outlet temperature sensor 6 and the water flowmeter 8 are arranged on a water outlet pipeline of the plate heat exchanger and are used for respectively detecting real-time water outlet temperature and real-time water flow; the water inlet temperature sensor 7 is arranged on a water inlet pipeline of the plate heat exchanger and is used for detecting the real-time water inlet temperature; the discharge temperature sensor 9 is provided on the discharge line between the compressor 1 and the four-way selector valve 5, and detects the discharge temperature of the compressor 1.
In one example, a controller of the heat pump host receives a startup signal, controls the compressor to start working, and drives the condensing agent to operate in a closed loop system formed by the compressor, the plate heat exchanger, the electronic expansion valve and the fin heat exchanger in the condensing pipeline, so that the heat pump can refrigerate or heat. In the refrigerating or heating process of the heat pump unit, the real-time water outlet temperature and the real-time water inlet temperature are detected through the water outlet temperature sensor and the water inlet temperature sensor, the real-time water flow is detected through the water flow meter, the exhaust temperature of the compressor is detected through the exhaust temperature, and the environment temperature of the heat pump unit during operation is detected through the environment temperature sensor. The controller judges whether the heat pump unit is in a stable state or whether external conditions change or not by acquiring the data and acquiring the operating parameters such as the operating frequency of the heat pump unit, the rotating speed of the fan, the opening degree of the electronic expansion valve and the like, and executes the step of the opening degree adjusting method of the electronic expansion valve.
According to the electronic expansion valve opening adjusting method, the electronic expansion valve opening adjusting device, the controller and the heat pump host, after the heat pump system stably operates, accurate adjustment of the electronic expansion valve is performed, output capacity changes before and after adjustment are compared, and adjustment is repeated until the optimal output capacity of the heat pump unit is obtained and stable output is kept. According to the method and the device, the adjustment direction of the heat pump unit is primarily judged by comparing the difference between the exhaust temperature and the water outlet temperature, so that the optimal output capacity of the heat pump unit can be quickly obtained, and stable output is maintained. In addition, when the operation parameters of the heat pump unit and external conditions are changed, the method can start the readjustment of the opening degree to adapt to the change, and has flexibility.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (10)
1. The opening degree adjusting method of the electronic expansion valve is characterized by comprising the following steps of:
s1: after the heat pump unit stably operates, acquiring initial output capacity Q1 of the heat pump unit;
s2: acquiring the adjusting direction and the adjusting quantity of the electronic expansion valve, and adjusting the opening of the electronic expansion valve according to the adjusting direction and the adjusting quantity;
s3: after the heat pump unit stably operates, acquiring the real-time output capacity Q2 of the heat pump unit;
s4: comparing the output capacity change of the heat pump unit before and after the adjustment, and repeating the steps S2-S3 until the output capacity after the adjustment is not more than the output capacity before the adjustment if the output capacity after the adjustment is more than the output capacity before the adjustment.
2. The electronic expansion valve opening degree adjustment method according to claim 1, characterized in that:
in step S4, after repeating steps S2-S3, if the output capacity after adjustment is smaller than the output capacity before adjustment, the electronic expansion valve is controlled to operate at the opening degree before adjustment.
3. The method according to claim 1, wherein in step S4, the output capacity change of the heat pump unit before and after the adjustment is compared, and if the adjusted output capacity is smaller than the output capacity before the adjustment, the method further comprises the steps of:
s6: adjusting the opening value of the electronic expansion valve according to the opposite direction of the adjusting direction and the adjusting amount;
s7: after the heat pump unit stably operates, acquiring the real-time output capacity Q3 of the heat pump unit;
s8: comparing the output capacity change of the heat pump unit before and after the adjustment, and repeating the steps S6-S7 until the output capacity after the adjustment is not more than the output capacity before the adjustment if the output capacity after the adjustment is more than the output capacity before the adjustment.
4. The electronic expansion valve opening degree adjustment method according to claim 3, characterized in that:
in step S8, after repeating steps S6 to S7, if the output capacity after adjustment is smaller than the output capacity before adjustment, the electronic expansion valve is controlled to operate at the opening degree before adjustment.
5. The method for adjusting the opening degree of an electronic expansion valve according to claim 1, wherein in step S2, the step of obtaining the adjustment direction of the electronic expansion valve includes:
acquiring the exhaust temperature and the outlet water temperature of the heat pump unit;
calculating a difference between the exhaust temperature and the outlet water temperature;
when the difference value is larger than a set threshold value, the direction in which the opening of the electronic expansion valve is increased is taken as the adjusting direction;
and when the difference value is smaller than a set threshold value, taking the direction in which the opening of the electronic expansion valve is reduced as the adjusting direction.
6. The electronic expansion valve opening degree adjustment method according to claim 1, characterized in that:
the output capacity Q of the heat pump unit is calculated based on the following formula:
Q＝L*(T1-T2)*f
wherein L is the real-time water flow of the heat pump unit, T1 is the water inlet temperature of the heat pump unit, T2 is the water outlet temperature of the heat pump unit, and f is the regulating factor;
the adjustment coefficient f is 1.1-1.2.
7. The method for adjusting the opening degree of an electronic expansion valve according to claim 1, further comprising, before step S1:
acquiring the operation parameters of the heat pump unit, and judging that the heat pump unit stably operates when the operation parameters are stable;
wherein the operating parameters include at least one of:
the operation frequency of the heat pump unit, the rotating speed of the fan and the opening of the electronic expansion valve.
8. An electronic expansion valve opening degree adjusting device, characterized by comprising:
the initial capacity acquisition module is used for acquiring initial output capacity Q1 of the heat pump unit after the heat pump unit stably operates;
the adjusting opening determining module is used for obtaining the adjusting direction and the adjusting quantity of the electronic expansion valve and adjusting the opening of the electronic expansion valve according to the adjusting direction and the adjusting quantity;
the real-time capacity acquisition module is used for acquiring the real-time output capacity Q2 of the heat pump unit after the heat pump unit stably operates;
and the capacity change comparison module is used for comparing the output capacity change of the heat pump unit before and after adjustment, and if the output capacity after adjustment is larger than the output capacity before adjustment, the adjustment steps of the adjustment opening determining module and the real-time capacity obtaining module are repeatedly executed until the output capacity after adjustment is not larger than the output capacity before adjustment.
9. A controller, comprising:
at least one memory and at least one processor;
the memory is used for storing one or more programs;
when the one or more programs are executed by the at least one processor, the at least one processor is caused to implement the steps of a method of controlling a heat pump unit according to any one of claims 1 to 7.
10. A heat pump host, characterized by:
comprising a controller as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310168768.9A CN116136342A (en) | 2023-02-24 | 2023-02-24 | Electronic expansion valve opening degree adjusting method and device, controller and heat pump host |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310168768.9A CN116136342A (en) | 2023-02-24 | 2023-02-24 | Electronic expansion valve opening degree adjusting method and device, controller and heat pump host |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116136342A true CN116136342A (en) | 2023-05-19 |
Family
ID=86333510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310168768.9A Pending CN116136342A (en) | 2023-02-24 | 2023-02-24 | Electronic expansion valve opening degree adjusting method and device, controller and heat pump host |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116136342A (en) |
-
2023
- 2023-02-24 CN CN202310168768.9A patent/CN116136342A/en active Pending
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