CN113280540A - Opening control method and device of electronic expansion valve and refrigeration display cabinet - Google Patents
Opening control method and device of electronic expansion valve and refrigeration display cabinet Download PDFInfo
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- CN113280540A CN113280540A CN202110651299.7A CN202110651299A CN113280540A CN 113280540 A CN113280540 A CN 113280540A CN 202110651299 A CN202110651299 A CN 202110651299A CN 113280540 A CN113280540 A CN 113280540A
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
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Abstract
The invention discloses an opening control method and device of an electronic expansion valve and a refrigeration display cabinet. Wherein, the method comprises the following steps: detecting the environmental temperature before starting the system and determining the initial opening degree of the electronic expansion valve according to the environmental temperature; and detecting the ambient temperature before each operation period of the system, and determining the opening degree adjusting frequency of the electronic expansion valve in the operation period of the system according to the ambient temperature. According to the invention, the initial opening degree of the electronic expansion valve is determined according to the environmental temperature before the system is started to operate, and the opening degree adjusting frequency of the electronic expansion valve in the operation period is determined before the operation period. Therefore, the system operation efficiency and the system reliability are improved, and the adaptability of the refrigeration display cabinet in different application scenes is enhanced.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a method and a device for controlling the opening degree of an electronic expansion valve and a refrigeration display cabinet.
Background
The electronic expansion valve is used as a common throttling device in refrigeration equipment, and can rapidly adjust the flow of a refrigerant according to the operating environment. When the external environment temperature changes, the suction superheat degree changes, and for a system with an electronic expansion valve adopted by a throttling device, superheat degree information can be obtained by collecting the temperature of a refrigerant at an inlet and an outlet of an evaporator through a temperature sensing bulb, and the superheat degree information is fed back to a control module in real time, so that the opening degree of the electronic expansion valve is adjusted.
At present, the control logic of an electronic expansion valve is generally a preset initial opening degree B0, when a system starts to operate, the existing electronic expansion valve adjusting method mainly performs PID adjustment on the opening degree of the electronic expansion valve according to the suction superheat degree, when the superheat degree of the system is less than a set superheat degree, the opening degree of the electronic expansion valve is decreased, and when the superheat degree of the system is greater than the set superheat degree, the opening degree of the electronic expansion valve is increased.
Because a standard test environment is usually adopted in the process of testing the showcase, and the environmental parameters are not changed, the control strategy is biased to optimize the control parameters in the test environment, and in actual use, the external environment temperature fluctuates frequently and the amplitude is large and small, and the current opening control strategy cannot meet the use scene of the showcase with frequent fluctuation of the external temperature.
Aiming at the problem that in the prior art, the opening control effect of an electronic expansion valve is not ideal under the scene of frequent fluctuation of the external environment temperature, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides an opening control method and device of an electronic expansion valve and a refrigeration display cabinet, and aims to solve the problem that in the prior art, the opening control effect of the electronic expansion valve is not ideal under the scene of frequent fluctuation of the external environment temperature.
In order to solve the above technical problem, the present invention provides a method for controlling an opening degree of an electronic expansion valve, wherein the method comprises: detecting the environmental temperature before starting the system and determining the initial opening degree of the electronic expansion valve according to the environmental temperature; and detecting the ambient temperature before each operation period of the system, and determining the opening degree adjusting frequency of the electronic expansion valve in the operation period of the system according to the ambient temperature.
Further, determining an initial opening degree of the electronic expansion valve according to the ambient temperature includes: judging whether the environment temperature is in a temperature interval (preset temperature-delta T)Lower partPreset temperature +. DELTA.TOn the upper part](ii) a If the ambient temperature is greater than the preset temperature +. DELTA.TOn the upper partDetermining that the initial opening degree of the electronic expansion valve is equal to a preset initial opening degree plus a first increment; if the ambient temperature is less than a predetermined temperature-DeltaTLower partDetermining that the initial opening degree of the electronic expansion valve is equal to a preset initial opening degree-a first reduction amount; and if the environment temperature is in the temperature interval, determining that the initial opening degree of the electronic expansion valve is equal to a preset initial opening degree.
Further, the first increase amount is (ambient temperature-preset temperature) · Δ a; the first decrement is (preset temperature-ambient temperature) · Δ a; wherein Δ a is an opening degree adjustment coefficient.
Further, determining the opening degree adjusting frequency of the electronic expansion valve in the operation period of the system according to the environment temperature comprises the following steps: judging whether the environment temperature is in a temperature interval (preset temperature-delta T)Lower partPreset temperature +. DELTA.TOn the upper part](ii) a If the ambient temperature is greater than the preset temperature +. DELTA.TOn the upper partDetermining that the opening degree adjusting frequency of the electronic expansion valve is equal to a preset initial frequency plus a second increment; if the ambient temperature is less than a predetermined temperature-DeltaTLower partDetermining that the opening degree adjusting frequency of the electronic expansion valve is equal to a preset initial frequency and a second reduction amount; and if the environment temperature is in the temperature interval, determining that the opening degree adjusting frequency of the electronic expansion valve is equal to a preset initial frequency.
Further, the second increase amount is (ambient temperature-preset temperature) · Δ B; the second decrement is (preset temperature-ambient temperature) · Δ B; where Δ B is a frequency adjustment coefficient.
Further, after determining the opening degree adjustment frequency of the electronic expansion valve in the operation cycle of the system according to the ambient temperature, the method further comprises: if the determined opening degree adjusting frequency exceeds a preset highest frequency, finally determining the opening degree adjusting frequency as the preset highest frequency; and finally determining the opening degree adjusting frequency to be the preset lowest frequency if the determined opening degree adjusting frequency is lower than the preset lowest frequency.
Further, after determining the opening degree adjustment frequency of the electronic expansion valve in the operation cycle of the system according to the ambient temperature, the method further comprises: detecting an ambient temperature during an operating cycle of the system; and adjusting the opening adjusting frequency of the electronic expansion valve in real time according to the environment temperature.
Further, adjusting the opening degree adjusting frequency of the electronic expansion valve in real time according to the environment temperature includes: judging whether the environment temperature is in a temperature interval (preset temperature-delta T)Lower partPreset temperature +. DELTA.TOn the upper part](ii) a If the ambient temperature is greater than the preset temperature +. DELTA.TOn the upper partAdjusting the opening degree adjusting frequency of the electronic expansion valve to be equal to a preset initial frequency plus a second increment; if the ambient temperature is less than a predetermined temperature-DeltaTLower partAdjusting the opening degree adjusting frequency of the electronic expansion valve to be a preset initial frequency-a second reduction amount; and if the environment temperature is in the temperature interval, adjusting the opening degree adjusting frequency of the electronic expansion valve to be a preset initial frequency.
Further, the method further comprises: monitoring the superheat degree of the system in the operation period of the system; adjusting the opening degree of the electronic expansion valve according to the superheat degree; and adjusting the opening degree of the electronic expansion valve according to the opening degree adjusting frequency in the operation period of the system.
Further, adjusting the opening degree of the electronic expansion valve according to the superheat degree includes: if the superheat degree exceeds the maximum value of a preset range, the opening degree of the electronic expansion valve is increased; if the superheat degree is lower than the minimum value of a preset range, the opening degree of the electronic expansion valve is reduced; and if the superheat degree is in the preset range, the opening degree of the electronic expansion valve does not need to be adjusted.
The invention also provides an opening control device of the electronic expansion valve, wherein the device comprises: the temperature detection module is used for detecting the ambient temperature before the system is started to operate and detecting the ambient temperature before the operation period of the system; the first processing module is used for determining the initial opening degree of the electronic expansion valve according to the detected ambient temperature before the system is started to operate; and the second processing module is used for determining the opening degree adjusting frequency of the electronic expansion valve in each operation period of the system according to the detected environment temperature before each operation period of the system.
Further, the apparatus further comprises: the third processing module is used for monitoring the superheat degree of the system in the operation period of the system; adjusting the opening degree of the electronic expansion valve according to the superheat degree; and adjusting the opening degree of the electronic expansion valve according to the opening degree adjusting frequency in a system operation period.
The invention also provides a refrigeration display cabinet, which comprises the opening control device of the electronic expansion valve.
The invention also provides a computer-readable storage medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the method as described above.
By applying the technical scheme of the invention, the initial opening degree of the electronic expansion valve is determined according to the ambient temperature before the system is started to operate, and the opening degree adjusting frequency of the electronic expansion valve is determined according to the ambient temperature before the system operates periodically. Therefore, the system operation efficiency is improved, the system reliability is improved, the refrigeration effect of the system is ensured, and the adaptability of the refrigeration showcase under different application scenes is enhanced.
Drawings
Fig. 1 is a flowchart of an opening degree control method of an electronic expansion valve according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating an initial opening adjustment of an electronic expansion valve according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an upper adjustment limit and a lower adjustment limit of an opening degree adjustment frequency of an electronic expansion valve according to an embodiment of the invention;
fig. 4 is a block diagram illustrating an arrangement of an opening degree control apparatus of an electronic expansion valve according to an embodiment of the present invention;
fig. 5 is a schematic view of the refrigeration system of the refrigerated display case according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the control logic of the control module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention 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, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
Fig. 1 is a flowchart of an opening degree control method of an electronic expansion valve according to an embodiment of the present invention, as shown in fig. 1, the method comprising the steps of:
step S101, detecting the environmental temperature before the system is started to operate, and determining the initial opening degree of the electronic expansion valve according to the environmental temperature;
and S102, detecting the ambient temperature before each operation period of the system, and determining the opening degree adjusting frequency of the electronic expansion valve in the operation period of the system according to the ambient temperature.
According to the method and the device, the initial opening of the electronic expansion valve is adjusted in a self-adaptive mode when the system is started up according to the change of the ambient temperature of the space where the refrigeration display cabinet is located, and the opening adjusting frequency in each operation period can be determined, so that the operation efficiency of the system is improved, the reliability of the system is improved, and the adaptability of the refrigeration display cabinet in different application scenes is enhanced.
This embodiment can be implemented by the following preferred embodiments when determining the initial opening degree of the electronic expansion valve according to the ambient temperature: judging whether the environment temperature is in the temperature interval (preset temperature-delta T)Lower partPreset temperature +. DELTA.TOn the upper part](ii) a If the ambient temperature is greater than the preset temperature +. DELTA.TOn the upper partDetermining the initial opening degree of the electronic expansion valve as a preset initial opening degree plus a first increment, wherein the first increment is (environment temperature-preset temperature) · delta A, and the delta A is an opening degree adjusting coefficient and is a preset parameter of a system operation programAnd (4) counting. If the ambient temperature is less than the predetermined temperature-Delta TLower partThen, the initial opening degree of the electronic expansion valve is determined to be the preset initial opening degree-a first reduction amount, and the first reduction amount is determined to be (preset temperature-ambient temperature) · Δ a. And if the environment temperature is in the temperature interval, determining that the initial opening degree of the electronic expansion valve is equal to a preset initial opening degree. Based on this, can guarantee the refrigeration effect, can guarantee the reliable operation of system again.
This embodiment sets two deviation values DeltaTOn the upper partAnd Δ TLower partThe method aims to enhance the adaptability of the system in different application scenes.
FIG. 2 is a schematic diagram illustrating an initial opening adjustment of an electronic expansion valve according to an embodiment of the present invention, as shown in FIG. 2, with a preset temperature interval [ preset temperature T ]0-△TLower partAt a predetermined temperature T0+△TOn the upper part]The temperature interval corresponds to a preset initial opening degree B0, that is, when the ambient temperature is in the temperature interval, the operation is performed according to the preset initial opening degree, the opening degree does not need to be adjusted, and the delta TOn the upper partAnd Δ TLower partTemperature deviations are characterized. And before the system starts to operate, detecting the ambient temperature Tn in real time, and judging whether the ambient temperature Tn is in a temperature interval.
When the ambient temperature T0-△TLower part≤Tn≤T0+△TOn the upper partAt this time, the preset initial opening degree B0 of the electronic expansion valve is relatively appropriate, and the initial opening degree Bn of the electronic expansion valve is B0.
When the ambient temperature Tn > T0+△TOn the upper partAt this time, it is explained that the preset initial opening B0 of the electronic expansion valve is relatively small, the refrigerant flow rate is relatively small, the time for the temperature in the refrigeration display cabinet to reach the set temperature value increases, the refrigeration effect becomes poor, and the suction superheat degree is too high, resulting in an increase in the exhaust temperature. According to the control logic, the initial opening degree Bn of the electronic expansion valve is B0+ (Tn-T)0) Δ A. Thereby improving the refrigeration effect and reducing the suction superheat degree.
When the ambient temperature Tn is less than T0-△TLower partAt this time, the preset initial opening B0 of the electronic expansion valve is relatively larger, and the refrigerant flow rate is larger, which will result in the decrease of the suction superheat degreeThe starting and stopping frequency of the compressor is improved, and the system efficiency is reduced. When the ambient temperature Tn is too low, air absorption and liquid entrainment are caused, and the operation of an external machine is adversely affected. At this time, the initial opening degree Bn of the electronic expansion valve is B0- (T)0-Tn) · Δ A. Therefore, the starting and stopping frequency of the system is reduced, and the operation reliability of the system is improved.
The system may be operated for one or more operating cycles from start-up operation until shutdown, with the current ambient temperature being sensed prior to each operating cycle, and the frequency of opening adjustment of the electronic expansion valve in subsequent operating cycles being determined based on the ambient temperature. Therefore, the opening degree adjusting frequency of the electronic expansion valve in each operation period can be adjusted timely along with the change of the environmental temperature, and the moderate opening degree adjusting frequency is ensured.
This embodiment can be implemented by the following preferred embodiments when determining the opening degree adjustment frequency of the electronic expansion valve in the operation cycle of the system according to the ambient temperature: judging whether the environment temperature is in the temperature interval (preset temperature-delta T)Lower partPreset temperature +. DELTA.TOn the upper part](ii) a If the ambient temperature is greater than the preset temperature +. DELTA.TOn the upper partDetermining the opening degree adjusting frequency of the electronic expansion valve as a preset initial frequency plus a second increment, wherein the second increment is (environmental temperature-preset temperature) · Δ B, and the Δ B is a frequency adjusting coefficient and is a preset parameter of a system operation program. If the ambient temperature is less than the predetermined temperature-Delta TLower partThen, the opening degree adjustment frequency of the electronic expansion valve is determined to be the preset initial frequency-the second reduction amount, and the second reduction amount is determined to be (the preset temperature-the ambient temperature) · Δ B. And if the environment temperature is in the temperature interval, determining that the opening degree adjusting frequency of the electronic expansion valve is equal to a preset initial frequency. Based on this, when ambient temperature is higher, alleviate the influence that the interior temperature fluctuation of cabinet frequently caused the storage commodity through improving aperture regulation frequency, when ambient temperature is lower, reduce aperture regulation frequency, avoid frequent regulation, realize energy-conservation and extension equipment life's purpose.
This embodiment sets two deviation values DeltaTOn the upper partAnd Δ TLower partTo avoid frequent adjustment of the opening of the electronic expansion valve of the showcase when the fluctuation of the ambient temperature is small。
After the opening degree adjusting frequency of the electronic expansion valve in the operation period of the system is determined according to the environment temperature, in order to avoid frequent adjustment caused by overhigh determined opening degree adjusting frequency or incapability of ensuring the refrigeration effect of the refrigeration showcase due to overlow opening degree adjusting frequency, the preset highest frequency and the preset lowest frequency for the opening degree adjusting frequency are preset in the embodiment, and if the determined opening degree adjusting frequency exceeds the preset highest frequency, the opening degree adjusting frequency is finally determined to be the preset highest frequency; and finally determining the opening degree adjusting frequency to be the preset lowest frequency if the determined opening degree adjusting frequency is lower than the preset lowest frequency.
Fig. 3 is a schematic diagram of an upper adjustment limit and a lower adjustment limit of an opening degree adjustment frequency of an electronic expansion valve according to an embodiment of the present invention, and as shown in fig. 3, the opening degree adjustment frequency t of the electronic expansion valve in an operation cycle of the system is determined according to an ambient temperature, where t is t0+(Tn-T0) Δ T, default preset temperature T0Corresponding opening degree regulating frequency is t0And Δ t is a coefficient. When the ambient temperature is great, alleviate the influence that the interior temperature fluctuation of refrigeration display cabinet frequently caused commodity through improving aperture regulation frequency, when ambient temperature is less, reduce aperture regulation frequency to avoid frequent regulation. The embodiment is preset with a preset highest frequency tmax and a preset lowest frequency tmin, if t is less than tmin, the actual input value t is tmin; if t is greater than tmax, the actual input value t is tmax; if tmin is less than or equal to t and less than or equal to tmax, the actual input value is t.
In addition to determining the opening degree adjustment frequency of the electronic expansion valve in the next operation period according to the environmental temperature before each operation period, the embodiment continuously detects the environmental temperature during the operation period of the system, and adjusts the opening degree adjustment frequency of the electronic expansion valve in real time according to the environmental temperature. The specific adjustment strategy is as follows:
judging whether the environment temperature is in the temperature interval (preset temperature-delta T)Lower partPreset temperature +. DELTA.TOn the upper part](ii) a If the ambient temperature is greater than the preset temperature +. DELTA.TOn the upper partAdjusting the opening degree adjusting frequency of the electronic expansion valve to be the preset initial frequency + the second frequencyAnd a second increment, wherein the second increment is (ambient temperature-preset temperature) · Δ B, and the Δ B is a frequency adjustment coefficient and is a preset parameter of a system operation program. If the ambient temperature is less than the predetermined temperature-Delta TLower partAnd adjusting the opening degree adjusting frequency of the electronic expansion valve to be the preset initial frequency-a second reduction amount, wherein the second reduction amount is (preset temperature-environment temperature) · Δ B. And if the ambient temperature is in the temperature range, adjusting the opening degree adjusting frequency of the electronic expansion valve to be a preset initial frequency. In the adjustment strategy, if the adjusted opening degree adjustment frequency exceeds the preset highest frequency, the opening degree adjustment frequency is finally determined to be the preset highest frequency; and finally determining the opening degree adjusting frequency to be the preset lowest frequency if the adjusted opening degree adjusting frequency is lower than the preset lowest frequency.
Based on this, when ambient temperature is higher, alleviate the influence that the interior temperature fluctuation of cabinet frequently caused the storage commodity of cabinet through improving aperture regulation frequency, when ambient temperature is lower, reduce aperture regulation frequency, avoid frequent regulation, realize energy-conservation and extension equipment life's purpose.
In the embodiment, the initial opening degree of the electronic expansion valve is determined according to the ambient temperature before the system operates, and the superheat degree of the system is monitored in the operation period of the system after the system starts to operate; adjusting the opening degree of the electronic expansion valve according to the superheat degree, specifically, if the superheat degree exceeds the maximum value of a preset range, increasing the opening degree of the electronic expansion valve; if the superheat degree is lower than the minimum value of the preset range, the opening degree of the electronic expansion valve is reduced; if the degree of superheat is within the preset range, the opening degree of the electronic expansion valve does not need to be adjusted. Of course, the opening degree of the electronic expansion valve needs to be adjusted in compliance with the above opening degree adjustment frequency during the operation cycle of the system. Based on this, can guarantee the normal steady operation in system operation period, guarantee the refrigeration effect of system.
Example 2
In correspondence with the method for controlling the opening degree of an electronic expansion valve described in fig. 1, the present embodiment provides an opening degree control device for an electronic expansion valve, such as the block diagram of the opening degree control device for an electronic expansion valve shown in fig. 4, the device comprising:
the temperature detection module 10 is used for detecting the ambient temperature before the system is started to operate and detecting the ambient temperature before the operation period of the system;
the first processing module 20 is connected to the temperature detection module 10, and is used for determining an initial opening degree of the electronic expansion valve according to the ambient temperature detected before the system is started to operate; and the number of the first and second groups,
and the second processing module 30 is connected to the temperature detection module 10 and is used for determining the opening degree adjusting frequency of the electronic expansion valve in each operation period of the system according to the ambient temperature detected before each operation period of the system.
According to the change of the environmental temperature, the initial opening degree of the electronic expansion valve during the starting operation of the system is adjusted in a self-adaptive mode, and the opening degree adjusting frequency in the operation period can be determined, so that the operation efficiency of the system is improved, the reliability of the system is improved, and the adaptability of the refrigeration display cabinet under different application scenes is enhanced.
The above-mentioned device still includes: the third processing module is used for monitoring the superheat degree of the system in the operation period of the system; adjusting the opening degree of the electronic expansion valve according to the superheat degree; and adjusting the opening degree of the electronic expansion valve according to the opening degree adjusting frequency in the system operation period. Therefore, the normal and stable operation of the system during the operation period can be ensured, and the refrigeration effect of the system is ensured.
For specific control logics of the first processing module, the second processing module, and the third processing module, detailed descriptions have been already provided in the above embodiments, and are not repeated here.
The embodiment also provides a refrigeration display cabinet which comprises the opening control device of the electronic expansion valve.
Fig. 5 is a schematic structural diagram of a refrigeration system of a refrigeration showcase according to an embodiment of the present invention, as shown in fig. 5, a control module 1 can implement control logics of the first processing module, the second processing module, and the third processing module, an environmental temperature sensing bulb 2 is connected to the control module 1, the environmental temperature sensing bulb 2 tests an environmental temperature after the compressor 3 is stopped, and feeds the environmental temperature back to the control module 1, and the control module 1 can adjust an initial opening degree and an opening degree adjustment frequency of the electronic expansion valve 4 according to the environmental temperature detected by the environmental temperature sensing bulb 2. An inlet temperature sensing bulb 6 is arranged at the inlet of the evaporator 5, an outlet temperature sensing bulb 7 is arranged at the outlet of the evaporator 5, and the degree of superheat of the system can be determined according to the inlet temperature and the outlet temperature of the evaporator 5.
The operation process of the refrigeration system is as follows: the condensing unit provides high-pressure refrigerant, the high-pressure refrigerant enters the display cabinet through a liquid pipe, is throttled and cooled through the electronic expansion valve 4, then is evaporated and absorbs heat in the evaporator 5, the refrigerant is changed into gaseous state after absorbing heat, enters the condensing unit through an air pipe and is sucked by the compressor 3, and a filter 8 and an electromagnetic valve 9 are arranged between the compressor 3 and the electronic expansion valve 4. The electronic expansion valve 4 controls system parameters such as the flow rate and the degree of superheat of the refrigerant by adjusting the opening degree. The opening of the electronic expansion valve 4 is controlled by the suction superheat and the ambient temperature.
The refrigerating system can be used for refrigerating display cabinets and other refrigerating devices. Such as an air curtain cabinet.
Fig. 6 is a schematic control logic diagram of a control module according to an embodiment of the present invention, and as shown in fig. 6, the control module obtains an outlet temperature detected by an outlet bulb of an evaporator, an inlet temperature detected by an inlet bulb of the evaporator, and an ambient temperature detected by an ambient bulb, and then determines an initial opening degree of an electronic expansion valve according to the ambient temperature, and an opening degree adjustment frequency of an operation cycle. The control module can also determine the degree of superheat according to the outlet temperature and the inlet temperature, and the opening degree adjustment in the system operation period is realized according to the degree of superheat.
When the ambient temperature rises, the refrigeration load rises, the flow of the refrigerant at the initial stage of the operation of the system is low, the reduction speed of the cabinet temperature is reduced, the refrigeration effect is deteriorated, the suction superheat degree is increased, and the exhaust temperature rises. The control module controls and improves the initial opening of the electronic expansion valve and the opening adjusting frequency, thereby ensuring the refrigerating speed of the system and reducing the exhaust temperature.
When the ambient temperature is reduced, the refrigeration load is reduced, the refrigerant flow at the initial stage of system operation is higher, the shutdown condition can be reached in a short time, the system is frequently started and shut down, the operation efficiency is reduced, the suction superheat degree is reduced, the liquid operation risk is caused, and the liquid impact hidden danger is caused to an outdoor unit without air separation. The control module reduces the initial opening of the electronic expansion valve, reduces the opening adjusting frequency, reduces the system starting and stopping frequency, improves the operation efficiency, and improves the suction superheat degree and the system reliability. The adaptability of the refrigeration display cabinet in different application scenes is enhanced.
Example 3
The embodiment of the present invention provides software for implementing the technical solutions described in the above embodiments and preferred embodiments.
Embodiments of the present invention provide a non-volatile computer storage medium, where the computer storage medium stores computer-executable instructions, and the computer-executable instructions may execute the method for controlling the opening degree of an electronic expansion valve in any of the above method embodiments.
The storage medium stores the software, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (14)
1. A method for controlling an opening degree of an electronic expansion valve, the method comprising:
detecting the environmental temperature before starting the system and determining the initial opening degree of the electronic expansion valve according to the environmental temperature;
and detecting the ambient temperature before each operation period of the system, and determining the opening degree adjusting frequency of the electronic expansion valve in the operation period of the system according to the ambient temperature.
2. The method of claim 1, wherein determining an initial opening degree of the electronic expansion valve based on the ambient temperature comprises:
judging whether the environment temperature is in a temperature interval (preset temperature-delta T)Lower partPreset temperature +. DELTA.TOn the upper part]；
If the ambient temperature is greater than the preset temperature +. DELTA.TOn the upper partDetermining that the initial opening degree of the electronic expansion valve is equal to a preset initial opening degree plus a first increment;
if the ambient temperature is less than a predetermined temperature-DeltaTLower partDetermining that the initial opening degree of the electronic expansion valve is equal to a preset initial opening degree-a first reduction amount;
and if the environment temperature is in the temperature interval, determining that the initial opening degree of the electronic expansion valve is equal to a preset initial opening degree.
3. The method of claim 2,
the first increase is (ambient temperature-preset temperature) · Δ a;
the first decrement is (preset temperature-ambient temperature) · Δ a; wherein Δ a is an opening degree adjustment coefficient.
4. The method of claim 1, wherein determining a frequency of opening adjustment of the electronic expansion valve during an operating cycle of the system based on the ambient temperature comprises:
judging whether the environment temperature is in a temperature interval (preset temperature-delta T)Lower partPreset temperature +. DELTA.TOn the upper part]；
If the ambient temperature is greater than the preset temperature +. DELTA.TOn the upper partDetermining that the opening degree adjusting frequency of the electronic expansion valve is equal to a preset initial frequency plus a second increment;
if the ambient temperature is less than a predetermined temperature-DeltaTLower partDetermining that the opening degree adjusting frequency of the electronic expansion valve is equal to a preset initial frequency and a second reduction amount;
and if the environment temperature is in the temperature interval, determining that the opening degree adjusting frequency of the electronic expansion valve is equal to a preset initial frequency.
5. The method of claim 4,
the second increase is (ambient temperature-preset temperature) · Δ B;
the second decrement is (preset temperature-ambient temperature) · Δ B; where Δ B is a frequency adjustment coefficient.
6. The method of claim 1, wherein after determining a frequency of opening adjustment of the electronic expansion valve during an operating cycle of the system based on the ambient temperature, the method further comprises:
if the determined opening degree adjusting frequency exceeds a preset highest frequency, finally determining the opening degree adjusting frequency as the preset highest frequency;
and finally determining the opening degree adjusting frequency to be the preset lowest frequency if the determined opening degree adjusting frequency is lower than the preset lowest frequency.
7. The method of claim 1, wherein after determining a frequency of opening adjustment of the electronic expansion valve during an operating cycle of the system based on the ambient temperature, the method further comprises:
detecting an ambient temperature during an operating cycle of the system;
and adjusting the opening adjusting frequency of the electronic expansion valve in real time according to the environment temperature.
8. The method of claim 7, wherein adjusting the opening degree adjustment frequency of the electronic expansion valve in real time according to the ambient temperature comprises:
judging whether the environment temperature is in a temperature interval (preset temperature-delta T)Lower partPreset temperature +. DELTA.TOn the upper part]；
If the ambient temperature is greater than the preset temperature +. DELTA.TOn the upper partAdjusting the opening degree adjusting frequency of the electronic expansion valve to be equal to a preset initial frequency plus a second increment;
if the ambient temperature is less than a predetermined temperature-DeltaTLower partAdjusting the opening degree adjusting frequency of the electronic expansion valve to be a preset initial frequency-a second reduction amount;
and if the environment temperature is in the temperature interval, adjusting the opening degree adjusting frequency of the electronic expansion valve to be a preset initial frequency.
9. The method according to any one of claims 1 to 8, further comprising:
monitoring the superheat degree of the system in the operation period of the system;
adjusting the opening degree of the electronic expansion valve according to the superheat degree; and adjusting the opening degree of the electronic expansion valve according to the opening degree adjusting frequency in the operation period of the system.
10. The method of claim 9, wherein adjusting the opening degree of the electronic expansion valve based on the degree of superheat comprises:
if the superheat degree exceeds the maximum value of a preset range, the opening degree of the electronic expansion valve is increased;
if the superheat degree is lower than the minimum value of a preset range, the opening degree of the electronic expansion valve is reduced;
and if the superheat degree is in the preset range, the opening degree of the electronic expansion valve does not need to be adjusted.
11. An opening degree control device of an electronic expansion valve, characterized by comprising:
the temperature detection module is used for detecting the ambient temperature before the system is started to operate and detecting the ambient temperature before the operation period of the system;
the first processing module is used for determining the initial opening degree of the electronic expansion valve according to the detected ambient temperature before the system is started to operate;
and the second processing module is used for determining the opening degree adjusting frequency of the electronic expansion valve in the operation period of the system according to the environment temperature detected before each operation period of the system.
12. The apparatus of claim 11, further comprising:
the third processing module is used for monitoring the superheat degree of the system in the operation period of the system; adjusting the opening degree of the electronic expansion valve according to the superheat degree; and adjusting the opening degree of the electronic expansion valve according to the opening degree adjusting frequency in a system operation period.
13. A refrigeration showcase characterized by comprising an opening degree control means of the electronic expansion valve according to claim 11 or 12.
14. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 10.
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