CN107664368B - Air conditioning system and control method and device of electronic expansion valve of air conditioning system - Google Patents
Air conditioning system and control method and device of electronic expansion valve of air conditioning system Download PDFInfo
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- CN107664368B CN107664368B CN201710890446.XA CN201710890446A CN107664368B CN 107664368 B CN107664368 B CN 107664368B CN 201710890446 A CN201710890446 A CN 201710890446A CN 107664368 B CN107664368 B CN 107664368B
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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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- 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
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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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Abstract
The invention discloses an air conditioning system and a control method and a device of an electronic expansion valve thereof, wherein the method comprises the following steps: acquiring the temperature of an exhaust port of a compressor in an air conditioning system, acquiring the return air superheat degree of the compressor and acquiring a target superheat degree interval; correcting the target superheat degree interval according to the temperature of the exhaust port, and acquiring the relationship between the return air superheat degree and the corrected target superheat degree interval; acquiring the opening degree regulation requirement of the electronic expansion valve according to the relationship between the return air superheat degree and the corrected target superheat degree interval, and judging whether the opening degree of the electronic expansion valve needs to be regulated or not according to the opening degree regulation requirement of the electronic expansion valve; if so, adjusting the opening degree of the electronic expansion valve once every preset time until the opening degree of the electronic expansion valve reaches a preset maximum opening degree or a preset minimum opening degree. The control method of the invention can ensure the reliability of the system, prolong the service life of the compressor and improve the use comfort of users.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of an electronic expansion valve in an air conditioning system, a control device of the electronic expansion valve in the air conditioning system and the air conditioning system with the control device.
Background
At present, air-conditioning products such as one-by-one air conditioners, multi-split air conditioners, unit machines, roof machines, air source heat pump water heaters and the like are generally applied to various large-scale office buildings, hospitals, factories, villas and the like, and along with the improvement of the living standard of people, more and more air-conditioning products enter the lives of people.
Capillary tubes, throttle valve spools, electronic expansion valves, thermostatic expansion valves, etc. are the most widely used throttling components for air conditioning systems, each of which has advantages and disadvantages. The electronic expansion valve has flow adjustability, can meet the flow adjustment requirements under different loads under all working conditions of the system, and ensures the reliability and the use comfort of a user of the system, so that the electronic expansion valve is widely applied to an air conditioning system, and how to more intelligently control the electronic expansion valve becomes a topic of interest in the industry.
Disclosure of Invention
The present invention is directed to solving at least one of the problems in the art to some extent. Therefore, a first objective of the present invention is to provide a control method for an electronic expansion valve in an air conditioning system, which adjusts the opening degree of the electronic expansion valve by monitoring the changes of the superheat degree of the return air and the exhaust temperature in real time, so as to ensure the reliability of the system, prolong the service life of the compressor, effectively avoid the occurrence of large system fluctuation by adjusting the valve body in real time, and improve the use comfort of users.
A second object of the invention is to propose a non-transitory computer-readable storage medium.
A third object of the present invention is to provide a control device for an electronic expansion valve in an air conditioning system.
A fourth object of the present invention is to provide an air conditioning system.
In order to achieve the above object, an embodiment of the first aspect of the present invention provides a method for controlling an electronic expansion valve in an air conditioning system, including the steps of: acquiring the temperature of an exhaust port of a compressor in the air conditioning system, acquiring the return air superheat degree of the compressor and acquiring a target superheat degree interval; correcting the target superheat degree interval according to the temperature of the exhaust port, and acquiring the relationship between the return air superheat degree and the corrected target superheat degree interval; acquiring the opening degree regulation requirement of the electronic expansion valve according to the relationship between the return air superheat degree and the corrected target superheat degree interval, and judging whether the opening degree of the electronic expansion valve needs to be regulated or not according to the opening degree regulation requirement of the electronic expansion valve; and if the opening degree of the electronic expansion valve needs to be adjusted, adjusting the opening degree of the electronic expansion valve once every preset time until the opening degree of the electronic expansion valve reaches a preset maximum opening degree or a preset minimum opening degree.
According to the control method of the electronic expansion valve in the air conditioning system, firstly, the temperature of the exhaust port of the compressor in the air conditioning system is obtained, the return air superheat degree of the compressor is obtained, a target superheat degree interval is obtained, then the target superheat degree interval is corrected according to the temperature of the exhaust port, the relationship between the return air superheat degree and the corrected target superheat degree interval is obtained, then the opening degree regulation requirement of the electronic expansion valve is obtained according to the relationship between the return air superheat degree and the corrected target superheat degree interval, and judges whether the opening of the electronic expansion valve needs to be adjusted according to the opening adjusting requirement of the electronic expansion valve, if the opening degree of the electronic expansion valve needs to be adjusted, the opening degree of the electronic expansion valve is adjusted once every preset time until the opening degree of the electronic expansion valve reaches a preset maximum opening degree or a preset minimum opening degree. Therefore, the method adjusts the opening degree of the electronic expansion valve by monitoring the change of the return air superheat degree and the exhaust temperature in real time, thereby ensuring the reliability of the system, prolonging the service life of the compressor, effectively avoiding the occurrence of large system fluctuation by adjusting the valve body in real time, and improving the use comfort of users.
In addition, the control method of the electronic expansion valve in the air conditioning system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, correcting the target superheat section based on the exhaust port temperature includes: judging whether the temperature of the exhaust port is greater than or equal to a second preset temperature and less than a first preset temperature or not; if the temperature of the exhaust port is greater than or equal to a second preset temperature and less than a first preset temperature, keeping the target superheat degree interval unchanged; if the temperature of the exhaust port is lower than a second preset temperature, increasing the lower limit value of the target superheat degree interval by a first superheat degree threshold value, and increasing the upper limit value of the target superheat degree interval by a first superheat degree threshold value; and if the temperature of the exhaust port is greater than or equal to a first preset temperature, reducing the lower limit value of the target superheat degree interval by a second superheat degree threshold value, and reducing the upper limit value of the target superheat degree interval by the second superheat degree threshold value.
According to one embodiment of the invention, acquiring the opening degree adjustment requirement of the electronic expansion valve according to the relationship between the return air superheat degree and the corrected target superheat degree interval comprises the following steps: when the return air superheat degree is larger than the upper limit value of the corrected target superheat degree interval, k1 (delta T-b) is determined according to the formula delta Q2Calculating the opening degree adjustment requirement, wherein Δ Q is the opening degree adjustment requirement, k1 is a first opening degree adjustment coefficient, and k1>0, delta T is the return air superheat degree, and b is the upper limit value of the corrected target superheat degree interval; when the return air superheat degree is larger than the lower limit value of the corrected target superheat degree interval and is smaller than or equal to the upper limit value of the corrected target superheat degree interval, the opening degree adjustment requirement delta Q is 0; when the return air superheat degree is less than or equal to the lower limit value of the corrected target superheat degree interval, k2 (delta T-a) is determined according to the formula delta Q2Calculating the opening degree adjustment demand, wherein k2 is a second opening degree adjustment coefficient, and k2<0 and a are lower limit values of the corrected target superheat degree interval.
According to an embodiment of the present invention, the first opening degree adjustment coefficient and the second opening degree adjustment coefficient are both in positive correlation with the preset time.
In order to achieve the above object, a second aspect of the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, and the program, when executed by a processor, implements the control method of the electronic expansion valve in the air conditioning system.
The non-transitory computer readable storage medium of the embodiment of the invention can ensure the reliability of the system, prolong the service life of the compressor and simultaneously improve the use comfort of users by executing the control method of the electronic expansion valve in the air conditioning system.
In order to achieve the above object, a third aspect of the present invention provides a control device for an electronic expansion valve in an air conditioning system, comprising: the first acquisition module is used for acquiring the temperature of an exhaust port of a compressor in the air conditioning system; the second acquisition module is used for acquiring the return air superheat degree of the compressor; the third acquisition module is used for acquiring a target superheat degree interval; the correction module is used for correcting the target superheat degree interval according to the temperature of the exhaust port; the fourth acquisition module is used for acquiring the relationship between the return air superheat degree and the corrected target superheat degree interval; and the control module is used for acquiring the opening degree adjusting requirement of the electronic expansion valve according to the relation between the return air superheat degree and the corrected target superheat degree interval, judging whether the opening degree of the electronic expansion valve needs to be adjusted or not according to the opening degree adjusting requirement of the electronic expansion valve, and adjusting the opening degree of the electronic expansion valve once every preset time when the opening degree of the electronic expansion valve needs to be adjusted until the opening degree of the electronic expansion valve reaches the preset maximum opening degree or the preset minimum opening degree.
According to the control device of the electronic expansion valve in the air conditioning system, firstly, the temperature of the exhaust port of the compressor in the air conditioning system is obtained through the first obtaining module, the return air superheat degree of the compressor is obtained through the second obtaining module, the target superheat degree interval is obtained through the third obtaining module, then the target superheat degree interval is corrected through the correcting module according to the temperature of the exhaust port, then the relation between the return air superheat degree and the corrected target superheat degree interval is obtained through the fourth obtaining module, finally, the control module obtains the opening degree adjusting requirement of the electronic expansion valve according to the relation between the return air superheat degree and the corrected target superheat degree interval, judges whether the opening degree of the electronic expansion valve needs to be adjusted according to the opening degree adjusting requirement of the electronic expansion valve, and adjusts the opening degree of the electronic expansion valve once every preset time when the opening degree of the electronic expansion valve needs to be adjusted, until the opening degree of the electronic expansion valve reaches a preset maximum opening degree or a preset minimum opening degree. Therefore, the device adjusts the opening degree of the electronic expansion valve by monitoring the change of the return air superheat degree and the exhaust temperature in real time, thereby ensuring the reliability of the system, prolonging the service life of the compressor, effectively avoiding the occurrence of large fluctuation of the system by adjusting the valve body in real time, and improving the use comfort of users.
In addition, the control device for an electronic expansion valve in an air conditioning system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the correction module is further configured to determine whether the exhaust outlet temperature is greater than or equal to a second preset temperature and less than a first preset temperature; if the temperature of the exhaust port is greater than or equal to a second preset temperature and less than a first preset temperature, keeping the target superheat degree interval unchanged; if the temperature of the exhaust port is lower than a second preset temperature, increasing the lower limit value of the target superheat degree interval by a first superheat degree threshold value, and increasing the upper limit value of the target superheat degree interval by a first superheat degree threshold value; and if the temperature of the exhaust port is greater than or equal to a first preset temperature, reducing the lower limit value of the target superheat degree interval by a second superheat degree threshold value, and reducing the upper limit value of the target superheat degree interval by the second superheat degree threshold value.
According to an embodiment of the present invention, the control module is further configured to, when the return air superheat degree is greater than the upper limit value of the corrected target superheat degree interval, change k1(Δ T-b) according to a formula Δ Q2Calculating the opening degree adjustment requirement, wherein Δ Q is the opening degree adjustment requirement, k1 is a first opening degree adjustment coefficient, and k1>0, delta T is the return air superheat degree, and b is the upper limit value of the corrected target superheat degree interval; when the return air superheat degree is larger than the lower limit value of the corrected target superheat degree interval and is smaller than or equal to the upper limit value of the corrected target superheat degree interval, the opening degree adjustment requirement delta Q is 0; when the return air superheat degree is less than or equal to the lower limit value of the corrected target superheat degree interval, k2 (delta T-a) is determined according to the formula delta Q2Calculating the opening degree adjustment demand, wherein k2 is a second opening degree adjustment coefficient, and k2<0 and a are lower limit values of the corrected target superheat degree interval.
According to an embodiment of the present invention, the first opening degree adjustment coefficient and the second opening degree adjustment coefficient are both in positive correlation with the preset time.
In order to achieve the above object, a fourth aspect of the present invention provides an air conditioning system, which includes the above control device for an electronic expansion valve in the air conditioning system.
According to the air conditioning system provided by the embodiment of the invention, the reliability of the system can be ensured through the control device of the electronic expansion valve in the air conditioning system, the service life of the compressor is prolonged, the large fluctuation of the system is effectively avoided through the real-time adjustment of the valve body, and the use comfort level of a user is improved.
Drawings
FIG. 1 is a schematic diagram of an air conditioning system according to one embodiment of the present invention;
fig. 2 is a flowchart of a control method of an electronic expansion valve in an air conditioning system according to an embodiment of the present invention;
FIG. 3 is a logic diagram of a method of controlling an electronic expansion valve in an air conditioning system according to one embodiment of the present invention; and
fig. 4 is a block diagram illustrating an apparatus for controlling an electronic expansion valve in an air conditioning system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A control method of an electronic expansion valve in an air conditioning system, a control device of an electronic expansion valve in an air conditioning system, and an air conditioning system having the control device according to an embodiment of the present invention will be described with reference to the accompanying drawings.
In an embodiment of the present invention, as shown in fig. 1, the air conditioning system may include an outdoor unit 100 and an indoor heat exchanging device 200, wherein the outdoor unit 100 may include a compressor 110, a four-way valve 120, an outdoor heat exchanger 130, an electronic expansion valve 140, a temperature sensor 150 disposed at a discharge outlet of the compressor 110, a temperature sensor 160 disposed at a return outlet of the compressor 110, and a temperature sensor 170 disposed at a central portion of the outdoor heat exchanger 130.
When the air conditioning system operates in a cooling mode, a high-temperature and high-pressure refrigerant discharged from the compressor 110 enters the outdoor heat exchanger 130 through the four-way valve 120 to be condensed, is throttled by the electronic expansion valve 140, enters the indoor heat exchange device 200 (or other heat exchange equipment needing cooling) to exchange heat and evaporate, and then returns to the compressor 110. When the air conditioning system operates in a heating mode, a high-temperature and high-pressure refrigerant discharged from the compressor 110 directly enters the indoor heat exchange device 200 (a water tank or other heat exchange equipment requiring heating) to be condensed, is throttled by the electronic expansion valve 140, returns to the outdoor heat exchanger 130 to absorb heat and be evaporated, and returns to the compressor 110 through the four-way valve 120, and the circulation is performed in such a way to meet the cooling and heating requirements of users.
The electronic expansion valve 140 has flow adjustability, and can meet the flow adjustment requirements under different loads under all working conditions, so how to adjust the electronic expansion valve more intelligently to ensure the reliability of the system and the use moderation of users becomes the topic of most concern to the industry.
In the related art, air conditioning systems using electronic expansion valves for throttling, air source heat pump water heaters and other systems generally adopt a superheat degree adjusting mode, and are divided into a plurality of different sections according to the superheat degree, and the opening degree is fixed for adjustment. However, the system may have large fluctuation due to this method, which affects user experience, and the control method is not intelligent enough and cannot be adjusted in real time according to load changes.
In order to solve the problems, the invention provides a control method of an electronic expansion valve in an air conditioning system, which can ensure the reliability of the system, prolong the service life of a compressor, effectively avoid the occurrence of larger fluctuation of the system by adjusting a valve body in real time and improve the use comfort of a user.
Fig. 2 is a flowchart of a control method of an electronic expansion valve in an air conditioning system according to an embodiment of the present invention.
As shown in fig. 2, a method for controlling an electronic expansion valve in an air conditioning system according to an embodiment of the present invention may include the steps of:
and S1, acquiring the temperature of an exhaust port of a compressor in the air conditioning system, acquiring the return air superheat degree of the compressor and acquiring a target superheat degree interval.
Wherein, can acquire the gas vent temperature Tp of compressor through the temperature sensor who sets up in compressor discharge gate department earlier.
The air-conditioning system comprises a compressor, a temperature sensor, an outdoor heat exchanger, a temperature sensor and a temperature sensor, wherein the temperature sensor is arranged at the air return port of the compressor, the temperature sensor is used for acquiring the temperature of the middle part of the outdoor heat exchanger, and the temperature sensor is used for acquiring the temperature of the middle part of the outdoor heat exchanger T3. It is understood that, for a system in which a low-pressure sensor is provided at a return port of a compressor, the return air superheat degree Δ T of the compressor is Th — Te, where Te is a saturation temperature corresponding to a low-pressure, and the air conditioning system is operated in a heating mode or a cooling mode, the formula (Δ T — Th — Te) applies.
The target superheat interval may be (a, b), a < b, e.g., the target superheat interval may be (1, 3).
And S2, correcting the target superheat degree interval according to the temperature of the exhaust port, and acquiring the relationship between the return air superheat degree and the corrected target superheat degree interval.
According to one embodiment of the present invention, correcting the target superheat section based on the exhaust port temperature includes: and judging whether the temperature of the exhaust port is greater than or equal to a second preset temperature and less than a first preset temperature, if the temperature of the exhaust port is greater than or equal to the second preset temperature and less than the first preset temperature, keeping the target superheat degree interval unchanged, if the temperature of the exhaust port is less than the second preset temperature, increasing the lower limit value of the target superheat degree interval by a first superheat degree threshold value, increasing the upper limit value of the target superheat degree interval by a first superheat degree threshold value, and if the temperature of the exhaust port is greater than or equal to the first preset temperature, reducing the lower limit value of the target superheat degree interval by a second superheat degree threshold value, and reducing the upper limit value of the target superheat degree interval by a second superheat degree threshold value. The first preset temperature, the second preset temperature, the first superheat threshold value and the second superheat threshold value may be calibrated according to actual conditions, for example, the first superheat threshold value n may be 1, and the second superheat threshold value m may be 2.
Specifically, the exhaust port temperature Tp of the compressor is acquired in real time, and the target superheat interval is corrected according to the size of Tp. If the second preset temperature Tp2 is less than or equal to Tp and less than the first preset temperature Tp1, the current target superheat interval is kept unchanged, namely the target superheat interval does not change to (a, b), if Tp is less than Tp2, the exhaust port temperature of the current compressor is too low, the target superheat interval needs to be properly corrected, for example, the lower limit value and the upper limit value of the target superheat interval are both increased by a first superheat threshold value n, namely the corrected target superheat interval is (a + n, b + n), so that flow regulation is optimized, and reliability of the system is guaranteed, if Tp is more than or equal to Tp1, the exhaust port temperature of the current compressor is too high, the target superheat interval needs to be properly corrected, for example, the lower limit value and the upper limit value of the target superheat interval are both decreased by a second superheat threshold value m, namely the corrected target superheat interval is (a-m, b-m ], to optimize flow regulation and ensure system reliability.
And S3, acquiring the opening degree adjustment requirement of the electronic expansion valve according to the relationship between the return air superheat degree and the corrected target superheat degree interval, and judging whether the opening degree of the electronic expansion valve needs to be adjusted or not according to the opening degree adjustment requirement of the electronic expansion valve.
And S4, if the opening degree of the electronic expansion valve needs to be adjusted, the opening degree of the electronic expansion valve is adjusted once every preset time until the opening degree of the electronic expansion valve reaches a preset maximum opening degree or a preset minimum opening degree. The preset time can be calibrated according to actual conditions, and the preset maximum opening and the preset minimum opening are the maximum opening and the minimum opening of the electronic expansion valve allowed when the system stably operates.
According to one embodiment of the invention, acquiring the opening degree adjustment requirement of the electronic expansion valve according to the relationship between the return air superheat degree and the corrected target superheat degree interval comprises the following steps: when the return air superheat degree is larger than the upper limit value of the corrected target superheat degree interval, k1 (delta T-b) is determined according to the formula delta Q2Calculating an opening degree adjustment demand, wherein Δ Q is the opening degree adjustment demand, k1 is a first opening degree adjustment coefficient, and k1>0, delta T is return air superheat degree, b is corrected target superheat degreeUpper limit of the interval. When the return air superheat degree is greater than the lower limit value of the corrected target superheat degree interval and is less than or equal to the upper limit value of the corrected target superheat degree interval, the opening degree adjustment demand Δ Q is 0. When the return air superheat degree is less than or equal to the lower limit value of the corrected target superheat degree interval, k2 (delta T-a) is determined according to the formula delta Q2Calculating an opening degree adjustment requirement, wherein k2 is a second opening degree adjustment coefficient, and k2<0 and a are lower limit values of the corrected target superheat degree interval.
In the embodiment of the invention, the first opening degree regulating coefficient and the second opening degree regulating coefficient are in positive correlation with the preset time. That is, the longer the preset time, the larger the values of k1 and k2, and the shorter the preset time, the smaller the values of k1 and k 2.
Specifically, the corrected target superheat interval is obtained according to the exhaust port temperature Tp of the compressor, and when Tp2 is more than or equal to Tp < Tp1, the target superheat interval is still (a, b)]Then, the degree of superheat is divided into a target degree of superheat section (a, b) according to the degree of superheat Δ T of the returned air]Acquiring an opening degree adjustment demand delta Q of the electronic expansion valve, wherein the delta Q is larger than 0 to indicate that the opening degree of the electronic expansion valve needs to be adjusted to be larger, the delta Q is 0 to indicate that the current opening degree of the electronic expansion valve is kept unchanged, and the delta Q is smaller than 0 to indicate that the opening degree of the electronic expansion valve needs to be adjusted to be smaller. When Δ T > b, the opening degree adjustment demand Δ Q ═ k1(Δ T-b)2(k1 > 0), namely Δ Q > 0, indicating that the opening degree of the electronic expansion valve needs to be adjusted to be larger, and adjusting the opening degree of the electronic expansion valve once every preset time t until the opening degree is increased to a preset maximum opening degree. When a is more than delta T and less than or equal to b, delta Q is 0, which indicates that the opening degree of the electronic expansion valve is not required to be adjusted, and the current opening degree is kept. When the delta T is less than or equal to a, the opening degree adjusting demand delta Q is k2 (delta T-a)2(k2<0) That is, Δ Q is less than 0, it indicates that the opening degree of the electronic expansion valve needs to be decreased and controlled, and the opening degree of the electronic expansion valve is decreased once every preset time t until the opening degree is decreased to a preset minimum opening degree.
When Tp < Tp2, the target superheat interval is corrected to (a + n, b + n)]Then, the degree of superheat is calculated according to the degree of superheat Δ T of the returned air and the corrected target degree of superheat interval (a + n, b + n)]And acquiring the opening degree regulation demand delta Q of the electronic expansion valve. Wherein, when the delta T is more than b + n, the opening degree needs to be adjustedCalculating delta Q as k1 (delta T-b-n)2(k1 > 0), namely delta Q > 0, and the opening degree of the electronic expansion valve is adjusted to be larger once every preset time t until the opening degree is increased to the preset maximum opening degree. When a + n is less than delta T and less than or equal to b + n, delta Q is equal to 0, and the current opening is kept unchanged. When the delta T is less than or equal to a + n, the opening degree regulation demand delta Q is k2 (delta T-a-n)2(k2<0) And regulating the opening degree of the electronic expansion valve once every preset time t until the opening degree is regulated to the preset minimum opening degree, wherein delta Q is less than 0.
When Tp is more than or equal to Tp1, the target superheat interval is corrected to (a-m, b-m)]Then according to the return air superheat degree delta T and the corrected target superheat degree interval (a-m, b-m)]And acquiring the opening degree regulation demand delta Q of the electronic expansion valve. Wherein, when the delta T is larger than the b-m, the opening degree regulation demand delta Q is k1 (delta T-b + m)2(k1 > 0), namely delta Q > 0, and the opening degree of the electronic expansion valve is adjusted to be larger once every preset time t until the opening degree is increased to the preset maximum opening degree. When a-m is more than delta T and less than or equal to b-m, delta Q is 0, and the current opening is kept unchanged. When the delta T is less than or equal to a-m, the opening degree regulation demand delta Q is k2 (delta T-a + m)2(k2<0) And regulating the opening degree of the electronic expansion valve once every preset time t until the opening degree is regulated to the preset minimum opening degree, wherein delta Q is less than 0.
In the above embodiment, when calculating the opening degree adjustment demand of the electronic expansion valve, if the obtained opening degree adjustment demand Δ Q is not an integer, the adjustment is rounded up.
Further, fig. 3 is a logic diagram of a control method of an electronic expansion valve in an air conditioning system according to an embodiment of the present invention. As shown in fig. 3, after the air conditioning system is started, the discharge port temperature Tp of the compressor, the return port temperature Th of the compressor, the middle temperature T3 of the outdoor heat exchanger, and the target superheat interval (a, b) are obtained]And calculating the return air superheat degree delta T of the compressor (wherein the delta T is the return air superheat degree of the compressor during the heating operation of the air conditioning system) (Th-T3). When Tp < the second preset temperature Tp2, the following control logic is executed: when Δ T > b + n, the opening degree adjustment demand Δ Q of the electronic expansion valve becomes k1(Δ T-b-n)2K1 is more than 0, and the electronic expansion valve is enlarged once every preset time t; when a + n < Δ T ≦ b + n, Δ Q ≦ 0, holding electronsThe current opening degree of the expansion valve is unchanged; when Δ T ≦ a + n, Δ Q ═ k2(Δ T-a-n)2And k2 is less than 0, and the electronic expansion valve is reduced once every preset time t.
When Tp2 is more than or equal to Tp < the first preset temperature Tp1, the following control logic is executed: when Δ T > b, the opening degree adjustment demand Δ Q of the electronic expansion valve becomes k1(Δ T-b)2K1 is more than 0, and the electronic expansion valve is enlarged once every preset time t; when a is more than delta T and less than or equal to b, delta Q is 0, and the current opening degree of the electronic expansion valve is kept unchanged; when Δ T ≦ a, Δ Q ═ k2(Δ T-a)2And k2 is less than 0, and the electronic expansion valve is reduced once every preset time t.
When Tp is not less than Tp1, the following control logic is executed: when the delta T is larger than the b-m, the opening degree regulation demand delta Q of the electronic expansion valve is k1 (delta T-b + m)2K1 is more than 0, and the electronic expansion valve is enlarged once every preset time t; when the a-m is more than the delta T and less than or equal to the b-m, the delta Q is 0, and the current opening degree of the electronic expansion valve is kept unchanged; when Δ T is less than or equal to a-m, Δ Q is k2(Δ T-a + m)2And k2 is less than 0, and the electronic expansion valve is reduced once every preset time t.
In summary, according to the control method of the electronic expansion valve in the air conditioning system of the embodiment of the invention, firstly, the temperature of the exhaust port of the compressor in the air conditioning system is obtained, the return air superheat degree of the compressor is obtained, and the target superheat degree interval is obtained, then the target superheat degree interval is corrected according to the temperature of the exhaust port, the relationship between the return air superheat degree and the corrected target superheat degree interval is obtained, then the opening degree regulation requirement of the electronic expansion valve is obtained according to the relationship between the return air superheat degree and the corrected target superheat degree interval, and judges whether the opening of the electronic expansion valve needs to be adjusted according to the opening adjusting requirement of the electronic expansion valve, if the opening degree of the electronic expansion valve needs to be adjusted, the opening degree of the electronic expansion valve is adjusted once every preset time until the opening degree of the electronic expansion valve reaches a preset maximum opening degree or a preset minimum opening degree. Therefore, the method adjusts the opening degree of the electronic expansion valve by monitoring the change of the return air superheat degree and the exhaust temperature in real time, thereby ensuring the reliability of the system, prolonging the service life of the compressor, effectively avoiding the occurrence of large system fluctuation by adjusting the valve body in real time, and improving the use comfort of users.
Fig. 4 is a block diagram illustrating an apparatus for controlling an electronic expansion valve in an air conditioning system according to an embodiment of the present invention. As shown in fig. 4, the control device for an electronic expansion valve in an air conditioning system according to an embodiment of the present invention may include: a first obtaining module 10, a second obtaining module 20, a third obtaining module 30, a correction module 40, a fourth obtaining module 50 and a control module 60.
The first obtaining module 10 is configured to obtain a temperature of an air outlet of a compressor in an air conditioning system. The second obtaining module 20 is used for obtaining the return air superheat degree of the compressor. The third obtaining module 30 is used for obtaining a target superheat interval. The correction module 40 is configured to correct the target superheat interval based on the exhaust port temperature. The fourth obtaining module 50 is configured to obtain a relationship between the return air superheat degree and the corrected target superheat degree interval. The control module 60 is configured to obtain an opening degree adjustment requirement of the electronic expansion valve according to a relationship between the return air superheat degree and the corrected target superheat degree interval, judge whether the opening degree of the electronic expansion valve needs to be adjusted according to the opening degree adjustment requirement of the electronic expansion valve, and adjust the opening degree of the electronic expansion valve once every preset time when the opening degree of the electronic expansion valve needs to be adjusted until the opening degree of the electronic expansion valve reaches a preset maximum opening degree or a preset minimum opening degree.
According to an embodiment of the present invention, the correcting module 40 is further configured to determine whether the temperature of the exhaust port is greater than or equal to a second preset temperature and less than a first preset temperature, keep the target superheat interval unchanged if the temperature of the exhaust port is greater than or equal to the second preset temperature and less than the first preset temperature, increase a lower limit of the target superheat interval by a first superheat threshold and increase an upper limit of the target superheat interval by the first superheat threshold if the temperature of the exhaust port is less than the second preset temperature, decrease the lower limit of the target superheat interval by a second superheat threshold and decrease the upper limit of the target superheat interval by the second superheat threshold if the temperature of the exhaust port is greater than or equal to the first preset temperature.
According to an embodiment of the present invention, the control module 60 is further configured to determine that the return air superheat is greater than the upper limit of the corrected target superheat interval according to a formula Δ Q k1(Δ T-b)2And calculating an opening degree adjusting requirement, wherein delta Q is the opening degree adjusting requirement, k1 is a first opening degree adjusting coefficient, k1 is greater than 0, delta T is the return air superheat degree, and b is the upper limit value of the corrected target superheat degree interval. When the return air superheat degree is greater than the lower limit value of the corrected target superheat degree interval and is less than or equal to the upper limit value of the corrected target superheat degree interval, the opening degree adjustment demand Δ Q is 0. When the return air superheat degree is less than or equal to the lower limit value of the corrected target superheat degree interval, k2 (delta T-a) is determined according to the formula delta Q2And calculating an opening degree adjustment requirement, wherein k2 is a second opening degree adjustment coefficient, k1 is less than 0, and a is a lower limit value of the corrected target superheat degree interval.
According to one embodiment of the invention, the first opening degree adjustment coefficient and the second opening degree adjustment coefficient are positively correlated with the preset time.
It should be noted that, details that are not disclosed in the control device of the electronic expansion valve in the air conditioning system according to the embodiment of the present invention are referred to details that are disclosed in the control method of the electronic expansion valve in the air conditioning system according to the embodiment of the present invention, and detailed description thereof is omitted here for brevity.
According to the control device of the electronic expansion valve in the air conditioning system, firstly, the temperature of the exhaust port of the compressor in the air conditioning system is obtained through the first obtaining module, the return air superheat degree of the compressor is obtained through the second obtaining module, the target superheat degree interval is obtained through the third obtaining module, then the target superheat degree interval is corrected through the correcting module according to the temperature of the exhaust port, then the relation between the return air superheat degree and the corrected target superheat degree interval is obtained through the fourth obtaining module, finally, the control module obtains the opening degree adjusting requirement of the electronic expansion valve according to the relation between the return air superheat degree and the corrected target superheat degree interval, judges whether the opening degree of the electronic expansion valve needs to be adjusted according to the opening degree adjusting requirement of the electronic expansion valve, and adjusts the opening degree of the electronic expansion valve once every preset time when the opening degree of the electronic expansion valve needs to be adjusted, until the opening degree of the electronic expansion valve reaches a preset maximum opening degree or a preset minimum opening degree. Therefore, the device adjusts the opening degree of the electronic expansion valve by monitoring the change of the return air superheat degree and the exhaust temperature in real time, thereby ensuring the reliability of the system, prolonging the service life of the compressor, effectively avoiding the occurrence of large fluctuation of the system by adjusting the valve body in real time, and improving the use comfort of users.
In addition, an embodiment of the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the control method of the electronic expansion valve in the air conditioning system described above.
The non-transitory computer readable storage medium of the embodiment of the invention can ensure the reliability of the system, prolong the service life of the compressor and simultaneously improve the use comfort of users by executing the control method of the electronic expansion valve in the air conditioning system.
In addition, an embodiment of the present invention further provides an air conditioning system, which includes the control device for an electronic expansion valve in the air conditioning system.
According to the air conditioning system provided by the embodiment of the invention, the reliability of the system can be ensured through the control device of the electronic expansion valve in the air conditioning system, the service life of the compressor is prolonged, the large fluctuation of the system is effectively avoided through the real-time adjustment of the valve body, and the use comfort level of a user is improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A control method of an electronic expansion valve in an air conditioning system is characterized by comprising the following steps:
acquiring the temperature of an exhaust port of a compressor in the air conditioning system, acquiring the return air superheat degree of the compressor and acquiring a target superheat degree interval;
correcting the target superheat degree interval according to the temperature of the exhaust port, and acquiring the relationship between the return air superheat degree and the corrected target superheat degree interval, wherein the correcting the target superheat degree interval according to the temperature of the exhaust port comprises:
judging whether the temperature of the exhaust port is greater than or equal to a second preset temperature and less than a first preset temperature or not;
if the temperature of the exhaust port is greater than or equal to a second preset temperature and less than a first preset temperature, keeping the target superheat degree interval unchanged;
if the temperature of the exhaust port is lower than a second preset temperature, increasing the lower limit value of the target superheat degree interval by a first superheat degree threshold value, and increasing the upper limit value of the target superheat degree interval by a first superheat degree threshold value;
if the temperature of the exhaust port is greater than or equal to a first preset temperature, reducing the lower limit value of the target superheat degree interval by a second superheat degree threshold value, and reducing the upper limit value of the target superheat degree interval by the second superheat degree threshold value;
acquiring the opening degree regulation requirement of the electronic expansion valve according to the relationship between the return air superheat degree and the corrected target superheat degree interval, and judging whether the opening degree of the electronic expansion valve needs to be regulated or not according to the opening degree regulation requirement of the electronic expansion valve;
and if the opening degree of the electronic expansion valve needs to be adjusted, adjusting the opening degree of the electronic expansion valve once every preset time until the opening degree of the electronic expansion valve reaches a preset maximum opening degree or a preset minimum opening degree.
2. The method for controlling an electronic expansion valve in an air conditioning system according to claim 1, wherein obtaining an opening degree adjustment demand of the electronic expansion valve based on a relationship between the return air superheat degree and the corrected target superheat degree interval comprises:
when the return air superheat degree is larger than the upper limit value of the corrected target superheat degree interval, k1 (delta T-b) is determined according to the formula delta Q2Calculating the opening degree adjustment requirement, wherein Δ Q is the opening degree adjustment requirement, k1 is a first opening degree adjustment coefficient, and k1>0, delta T is the return air superheat degree, and b is the upper limit value of the corrected target superheat degree interval;
when the return air superheat degree is larger than the lower limit value of the corrected target superheat degree interval and is smaller than or equal to the upper limit value of the corrected target superheat degree interval, the opening degree adjustment requirement delta Q is 0;
when the return air superheat degree is less than or equal to the lower limit value of the corrected target superheat degree interval, k2 (delta T-a) is determined according to the formula delta Q2Calculating the opening degree adjustment demand, wherein k2 is a second opening degree adjustment coefficient, and k2<0 and a are lower limit values of the corrected target superheat degree interval.
3. The method for controlling an electronic expansion valve in an air conditioning system according to claim 2, wherein the first opening degree adjustment coefficient and the second opening degree adjustment coefficient are each in a positive correlation with the preset time.
4. A non-transitory computer-readable storage medium having stored thereon a computer program, wherein the program, when executed by a processor, implements a method of controlling an electronic expansion valve in an air conditioning system according to any one of claims 1 to 3.
5. A control device for an electronic expansion valve in an air conditioning system, comprising:
the first acquisition module is used for acquiring the temperature of an exhaust port of a compressor in the air conditioning system;
the second acquisition module is used for acquiring the return air superheat degree of the compressor;
the third acquisition module is used for acquiring a target superheat degree interval;
a correction module to correct the target superheat interval based on the exhaust port temperature, wherein the correction module is further to,
judging whether the temperature of the exhaust port is greater than or equal to a second preset temperature and less than a first preset temperature or not;
if the temperature of the exhaust port is greater than or equal to a second preset temperature and less than a first preset temperature, keeping the target superheat degree interval unchanged;
if the temperature of the exhaust port is lower than a second preset temperature, increasing the lower limit value of the target superheat degree interval by a first superheat degree threshold value, and increasing the upper limit value of the target superheat degree interval by a first superheat degree threshold value;
if the temperature of the exhaust port is greater than or equal to a first preset temperature, reducing the lower limit value of the target superheat degree interval by a second superheat degree threshold value, and reducing the upper limit value of the target superheat degree interval by the second superheat degree threshold value;
the fourth acquisition module is used for acquiring the relationship between the return air superheat degree and the corrected target superheat degree interval;
and the control module is used for acquiring the opening degree adjusting requirement of the electronic expansion valve according to the relation between the return air superheat degree and the corrected target superheat degree interval, judging whether the opening degree of the electronic expansion valve needs to be adjusted or not according to the opening degree adjusting requirement of the electronic expansion valve, and adjusting the opening degree of the electronic expansion valve once every preset time when the opening degree of the electronic expansion valve needs to be adjusted until the opening degree of the electronic expansion valve reaches the preset maximum opening degree or the preset minimum opening degree.
6. The apparatus of claim 5, wherein the control module is further configured to,
when the return air superheat degree is larger than the upper limit value of the corrected target superheat degree interval, k1 (delta T-b) is determined according to the formula delta Q2Calculating the opening degree adjustment requirement, wherein Δ Q is the opening degree adjustment requirement, k1 is a first opening degree adjustment coefficient, and k1>0, delta T is the return air superheat degree, and b is the upper limit value of the corrected target superheat degree interval;
when the return air superheat degree is larger than the lower limit value of the corrected target superheat degree interval and is smaller than or equal to the upper limit value of the corrected target superheat degree interval, the opening degree adjustment requirement delta Q is 0;
when the return air superheat degree is less than or equal to the lower limit value of the corrected target superheat degree interval, k2 (delta T-a) is determined according to the formula delta Q2Calculating the opening degree adjustment demand, wherein k2 is a second opening degree adjustment coefficient, and k2<0 and a are lower limit values of the corrected target superheat degree interval.
7. The apparatus for controlling an electronic expansion valve in an air conditioning system as claimed in claim 6, wherein the first opening degree adjustment coefficient and the second opening degree adjustment coefficient are both in a positive correlation with the preset time.
8. An air conditioning system comprising a control device for an electronic expansion valve in an air conditioning system as claimed in any of claims 5 to 7.
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| CN110848903B (en) * | 2019-11-20 | 2021-05-18 | 宁波奥克斯电气股份有限公司 | Air conditioner exhaust fluctuation control method and device, air conditioner and storage medium |
| CN110906516B (en) * | 2019-12-02 | 2021-06-29 | 四川长虹空调有限公司 | Variable frequency air conditioner expansion valve initial opening control method and variable frequency air conditioner |
| CN114136032B (en) * | 2021-11-24 | 2023-03-31 | 广东纽恩泰新能源科技发展有限公司 | Electronic expansion valve control method and device, computer equipment and storage medium |
| CN114688689B (en) * | 2022-03-31 | 2023-08-11 | 安徽奥克斯智能电气有限公司 | Opening degree adjusting method and device of electronic expansion valve and multi-connected air conditioner |
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