CN112167891A - Integrated control method, device and equipment for display cabinet - Google Patents
Integrated control method, device and equipment for display cabinet Download PDFInfo
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- CN112167891A CN112167891A CN202011024908.8A CN202011024908A CN112167891A CN 112167891 A CN112167891 A CN 112167891A CN 202011024908 A CN202011024908 A CN 202011024908A CN 112167891 A CN112167891 A CN 112167891A
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- temperature
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
- A47F3/00—Show cases or show cabinets
- A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
- A47F3/0478—Control or safety arrangements
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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
- F25B49/022—Compressor control arrangements
Abstract
The invention discloses an integrated control method, device and equipment for a display cabinet. Wherein, the method comprises the following steps: after the unit enters a refrigerating operation, calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet; wherein the unit is connected with a plurality of showcases; and determining the maximum temperature difference in the temperature differences of all the display cabinets, and adjusting the frequency of the compressor according to the maximum temperature difference. According to the invention, the compressor is controlled to modulate frequency according to the maximum temperature difference requirement of a plurality of display cabinets, the distribution of cold energy according to the requirement is realized, the load requirement of the plurality of display cabinets is timely met, and the effects of rapidly lowering the temperature in the cabinet and reducing the energy consumption can be achieved, so that the energy consumption of the display cabinets of convenience stores is reduced, the energy is saved and reliable, the perfect matching of an inner machine and an outer machine is realized, and the customer requirement is met.
Description
Technical Field
The invention relates to the technical field of units, in particular to an integrated control method, device and equipment for a display cabinet.
Background
With the development of society and the increase of the economic level of people, showcases having a display effect are increasingly used, and a refrigeration cycle system of the existing showcase generally includes a compressor, an evaporator and a condenser which are sequentially connected through pipes and form a loop cycle. Personnel can maintain the interior of the cabinet within a constant temperature range by adjusting the set temperature. Due to the different needs of convenience stores, the display cabinets have various forms and sizes, such as a six-foot air curtain cabinet, a three-foot air curtain cabinet, a double-door glass cabinet, a horizontal cabinet and the like, and the condensing units are required to be matched with the display cabinets with different sizes.
When the number of the display cabinets in the convenience store is large, an integrated control mode that one condensing unit (comprising a compressor, a condenser and the like) is connected with a plurality of display cabinets is adopted, and the integrated control has the advantages of simple equipment, easiness in control, wide adjustment range, capability of being controlled independently and the like.
The existing integrated control technology is mainly applied to multi-split air conditioning units, and as the showcase and the outdoor unit condensing unit are matched and selected by multiple manufacturers on the market, the existing market does not have the integrated control of matching the indoor unit and the outdoor unit, and the problems of complex control, complex parameters, poor reliability and the like can be caused by the non-targeted matching.
Aiming at the problems that the prior art that the outdoor unit and the showcase cannot be pertinently matched, the control parameters are complex and the cold quantity distribution is unreasonable, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides an integrated control method, device and equipment for a display cabinet, and aims to solve the problems that an outdoor unit and the display cabinet cannot be matched in a targeted mode in the prior art, so that control parameters are complex and cold distribution is unreasonable.
In order to solve the above technical problem, the present invention provides an integrated control method for a showcase, wherein the method comprises: after the unit enters a refrigerating operation, calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet; wherein the unit is connected with a plurality of showcases; and determining the maximum temperature difference in the temperature differences of all the display cabinets, and adjusting the frequency of the compressor according to the maximum temperature difference.
Further, it is determined that the unit enters cooling operation by: monitoring the actual temperature of each display cabinet; if the actual temperature of any one display cabinet meets the refrigeration condition, the unit enters refrigeration operation; wherein the refrigeration condition is that the temperature difference between the actual temperature and the preset temperature exceeds a preset value.
Further, calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet comprises the following steps: the actual temperature of each display cabinet is periodically or real-timely monitored through a temperature sensing bulb arranged on each display cabinet; and calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet.
Further, determining the maximum temperature difference among the temperature differences of all the display cases includes: counting the average value of the temperature difference calculated by each display cabinet within the preset time; the maximum temperature difference is taken as the maximum value among the average values of the temperature differences of all the showcases.
Further, adjusting the frequency of the compressor according to the maximum temperature difference comprises: determining frequency adjustment quantity based on a PID (proportion integration differentiation) adjustment method according to the maximum temperature difference calculated at this time and the maximum temperature differences calculated at the previous two times; and adjusting the frequency of the compressor according to the frequency adjustment amount.
Further, after adjusting the frequency of the compressor according to the maximum temperature difference, the method further includes: and continuously monitoring the actual temperature of each display cabinet to confirm whether the unit enters into the refrigeration operation.
The present invention also provides an integrated control apparatus of a showcase, wherein the apparatus includes: the calculating module is used for calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet after the unit enters the refrigeration operation; wherein the unit is connected with a plurality of showcases; the temperature difference determining module is used for determining the maximum temperature difference in the temperature differences of all the display cabinets; and the frequency adjusting module adjusts the frequency of the compressor according to the maximum temperature difference.
Further, the calculation module is specifically used for periodically or real-timely monitoring the actual temperature of each display cabinet through the temperature sensing bulb arranged on each display cabinet; and calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet.
Further, the temperature difference determining module is specifically configured to count an average value of the temperature differences calculated by each display cabinet within a preset time period; the maximum temperature difference is taken as the maximum value among the average values of the temperature differences of all the showcases.
Further, the frequency adjusting module is specifically configured to determine a frequency adjusting amount based on a PID adjusting method according to the maximum temperature difference calculated this time and the maximum temperature difference calculated in the previous two times; and adjusting the frequency of the compressor according to the frequency adjustment amount.
The invention also provides a display case integrated control device, wherein the display case integrated control device comprises the display case integrated control device.
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 compressor is controlled to modulate the frequency according to the maximum temperature difference requirement of a plurality of display cabinets, the distribution of cooling capacity according to the requirement is realized, the load requirement of the plurality of display cabinets is timely met, the effects of rapidly lowering the temperature in the cabinets and reducing the energy consumption can be achieved, so that the energy consumption of the display cabinets of convenience stores is reduced, the energy is saved and reliable, the perfect matching of an inner machine and an outer machine is realized, and the customer requirements are met.
Drawings
Fig. 1 is a flowchart of an integrated control method of a showcase according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a condensing unit according to an embodiment of the present invention connected to a plurality of showcases;
FIG. 3 is an integrated control flow diagram for a convenience store according to an embodiment of the present invention;
fig. 4 is a block diagram showing the construction of an integrated control apparatus of a showcase 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 integrated control method of a showcase according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
step S101, calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet after the unit enters the refrigeration operation; wherein, the unit is connected with a plurality of show cases;
and step S102, determining the maximum temperature difference in the temperature differences of all the display cabinets, and adjusting the frequency of the compressor according to the maximum temperature difference.
The compressor is controlled to modulate according to the maximum temperature difference requirement of a plurality of display cabinets, the cold quantity is distributed according to the requirement, the load requirements of the plurality of display cabinets are timely met, the effects of rapidly lowering the temperature in the cabinet and reducing the energy consumption can be achieved, the energy consumption of the display cabinets of convenience stores is reduced, the energy is saved, the reliability is realized, the perfect matching of an inner machine and an outer machine is realized, and the customer requirements are met.
Whether the unit can enter the refrigeration operation or not can be realized through the following preferred embodiments: monitoring the actual temperature of each display cabinet; if the actual temperature of any one display cabinet meets the refrigeration condition, the unit enters refrigeration operation; wherein, the refrigeration condition is that the temperature difference between the actual temperature and the preset temperature exceeds the preset value.
After the unit enters a refrigerating operation, monitoring the actual temperature of each display cabinet periodically (for example, at an interval of 1s) or in real time through a temperature sensing bulb (used for monitoring the temperature in each display cabinet) arranged on each display cabinet; and calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet. Then, the maximum value of the temperature difference of all the showcases can be used as the maximum temperature difference, or the average value of the temperature differences calculated by each showcase in a preset time (for example, 5s) can be counted, and the maximum value of the average value of the temperature differences of all the showcases can be used as the maximum temperature difference. The concept of setting the preset duration in this embodiment is because the program calculation has a delay, and the value cannot be fed back immediately every second, and the average value in a period of time is calculated, so the result is more accurate.
For the setting of the preset time period, it cannot be too short or too long, because the temperature difference amplitude in the short time (e.g. 5s) is not too large, and the temperature difference amplitude in the long time is large, which has a large influence on the final result. The show case with the largest temperature difference shows that the show case needs the largest refrigerating capacity, so that the unit provides the refrigerating capacity to a plurality of cabinets according to the largest refrigerating capacity, and the refrigerating capacity needed by each cabinet can be met.
After the maximum temperature difference is determined, a frequency regulating quantity is determined based on a PID regulating method according to the maximum temperature difference calculated at the time and the maximum temperature differences calculated at the previous two times, and the frequency of the compressor is regulated according to the frequency regulating quantity. In particular, this can be achieved according to the following formula:
frequency adjustment amount Δ F (n) ═ F (n) — F (n-1) ═ Kp (Δ Tmax \ u \) of compressorn－ΔTmax_n－1)+Ki*ΔTmax_+Kd/(ΔTmax_－2ΔTmax_n－1+ΔTmax_n－2)。F(n)＝F(n－1)+ΔF(n)。
Kp, Ki and Kd are preset parameters, F (n) is the adjusted frequency, F (n-1) is the frequency before adjustment, and delta Tmax (u)nIs the maximum temperature difference calculated at this time, delta Tmax (u)n－1Δ Tmax (u) \ the maximum temperature difference calculated for the previous timen－2The maximum temperature difference calculated for the previous time.
The frequency regulating quantity of the compressor can be calculated through the formula, and the adjusted frequency can be obtained by adding the frequency regulating quantity to the current frequency. The frequency conversion regulation of the compressor is realized by combining the actual demand and the actual load of the showcase.
After the frequency of the compressor is adjusted according to the maximum temperature difference, the actual temperature of each display cabinet is continuously monitored to determine whether the unit enters refrigeration operation or not, so that a control cycle is entered, and the integrated control method is executed in a cycle mode all the time as long as the unit is not powered off.
Example 2
Fig. 2 is a schematic view of a condenser unit according to an embodiment of the present invention connected to a plurality of showcases, and as shown in fig. 2, the condenser unit is connected to two (or more) showcases through a tee/branch pipe to provide cooling for the two showcases. The values in fig. 2 represent tube diameters, e.g. Φ 9.52 represents a tube diameter of 9.52 mm.
When the condensing unit is connected with a plurality of showcases, because the plurality of showcases have different loads, namely different requirements on cooling capacity, each showcase can meet the requirement on the cooling capacity, and the frequency of the compressor is modulated according to the showcase with the largest load (the largest difference between the actual temperature in the showcase and the set temperature in the showcase). Fig. 3 is a flow chart of integrated control of a convenience store according to an embodiment of the present invention, as shown in fig. 3, the flow chart including:
in step S301, the showcase is powered on.
In step S302, the controller obtains a preset temperature set by the user, and calculates a temperature difference Δ T between the actual temperature of the display cabinet and the preset temperature as the actual temperature Tk — the preset temperature Ts.
And step S303, judging whether the refrigerating condition is met according to the calculated temperature difference delta T. If yes, step S304 is executed, otherwise, step S302 is executed.
If the actual temperature of any one display cabinet meets the refrigeration condition, the unit enters refrigeration operation; wherein, the refrigeration condition is that the temperature difference between the actual temperature and the preset temperature exceeds the preset value.
And step S304, the unit enters refrigeration operation, and the compressor normally operates according to logic.
And step S305, the controller monitors the temperature difference between the actual temperature and the preset temperature of all the display cabinets at intervals of 1S and outputs the maximum temperature difference delta Tmax.
And S306, carrying out PID adjustment according to the output maximum temperature difference delta Tmax, and carrying out frequency conversion of the compressor according to the PID adjustment.
Frequency adjustment amount Δ F (n) ═ F (n) — F (n-1) ═ Kp (Δ Tmax \ u \) of compressorn－ΔTmax_n－1)+Ki*ΔTmax_+Kd/(ΔTmax_－2ΔTmax_n－1+ΔTmax_n－2)。F(n)＝F(n－1)+ΔF(n)。
Kp, Ki and Kd are preset parameters, F (n) is the adjusted frequency, F (n-1) is the frequency before adjustment, and delta Tmax (u)nIs the maximum temperature difference calculated at this time, delta Tmax (u)n－1Δ Tmax (u) \ the maximum temperature difference calculated for the previous timen－2The maximum temperature difference calculated for the previous time.
The frequency regulating quantity of the compressor can be calculated through the formula, and the adjusted frequency can be obtained by adding the frequency regulating quantity to the current frequency. The frequency conversion regulation of the compressor is realized by combining the actual demand and the actual load of the showcase.
And step S307, the controller monitors the temperature difference of each display cabinet every 1S, calculates the average value of the temperature difference of each display cabinet in the first 5S, and determines the maximum average value of the temperature difference as the maximum temperature difference.
And S308, regulating and controlling the refrigerating capacity in the cabinet according to the frequency conversion of the compressor, and reducing the temperature difference between the actual temperature and the preset temperature by the unit to finish the refrigerating cycle.
When the method is applied specifically, the operating frequency range of the compressor is 20-90 Hz, the refrigerating capacity of the unit is increased by increasing the frequency of the compressor, and the refrigerating capacity of the unit is decreased by reducing the frequency of the compressor. If all the showcases are shut down, the frequency of the compressors is reduced to 0Hz, and the unit is synchronously shut down at the moment. If one unit is connected with a display cabinet, the temperature in the display cabinet can be kept to float within the range of 1-10 ℃ in a refrigeration startup mode when the frequency of a compressor of the unit is about 55-70 Hz.
After completing a refrigeration cycle, judging whether the refrigeration condition is met according to the temperature difference, judging the actual temperature and the preset temperature in the display cabinet by the controller, and when T is reachedFeeling in cabinet＞TPreset ofAnd (3) when the temperature actually detected by the thermal bulb in the cabinet is higher than the set target temperature, the refrigerating condition is met, and the unit continues to refrigerate and cool. On the contrary, when TFeeling in cabinet＜TPreset ofAnd if the temperature actually detected by the temperature sensing bulb in the cabinet is lower than the set target temperature, the refrigeration shutdown mode is met, and the unit enters a standby state. The cycle is completed again, and so on.
The problem in the present centralized control is solved from the compressor frequency conversion of supporting formula integrated control outer machine to this embodiment. The outer machine can control the transmission of the refrigerating capacity according to the requirement of the display cabinet, can realize the perfect matching of the inner machine and the outer machine, is reliable and energy-saving, and meets the requirement of customers.
Example 3
In correspondence to the integrated control method of the showcase described in fig. 1, the present embodiment provides an integrated control apparatus of a showcase, as shown in a block diagram of the structure of the integrated control apparatus of the showcase shown in fig. 4, the apparatus including:
the calculating module 10 is used for calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet after the unit enters the refrigeration operation; wherein, the unit is connected with a plurality of show cases;
a temperature difference determination module 20 connected to the calculation module 10 for determining the maximum temperature difference among the temperature differences of all the display cases;
and a frequency adjusting module 30 connected to the temperature difference determining module 20 for adjusting the frequency of the compressor according to the maximum temperature difference.
The compressor is controlled to modulate according to the maximum temperature difference requirement of a plurality of display cabinets, the cold quantity is distributed according to the requirement, the load requirements of the plurality of display cabinets are timely met, the effects of rapidly lowering the temperature in the cabinet and reducing the energy consumption can be achieved, the energy consumption of the display cabinets of convenience stores is reduced, the energy is saved, the reliability is realized, the perfect matching of an inner machine and an outer machine is realized, and the customer requirements are met.
The above-mentioned device still includes: the calculating module is specifically used for monitoring the actual temperature of each display cabinet periodically or in real time through the temperature sensing bulb arranged on each display cabinet; and calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet. The temperature difference determining module is specifically used for counting the average value of the temperature difference calculated by each display cabinet within the preset time length; the maximum temperature difference is taken as the maximum value of the average value of the temperature differences of all the showcases. The concept of setting the preset duration in this embodiment is because the program calculation has a delay, and the value cannot be fed back immediately every second, and the average value in a period of time is calculated, so the result is more accurate.
The above-mentioned device still includes: the frequency adjusting module is specifically used for determining a frequency adjusting quantity based on a PID adjusting method according to the maximum temperature difference calculated at this time and the maximum temperature differences calculated at the previous two times; the frequency of the compressor is adjusted according to the frequency adjustment amount. In particular, this can be achieved according to the following formula:
frequency adjustment amount Δ F (n) ═ F (n) — F (n-1) ═ Kp (Δ Tmax \ u \) of compressorn－ΔTmax_n－1)+Ki*ΔTmax_+Kd/(ΔTmax_－2ΔTmax_n－1+ΔTmax_n－2)。F(n)＝F(n－1)+ΔF(n)。
Kp, Ki and Kd are preset parameters, F (n) is the adjusted frequency, F (n-1) is the frequency before adjustment, and delta Tmax (u)nIs the maximum temperature difference calculated at this time, delta Tmax (u)n－1Δ Tmax (u) \ the maximum temperature difference calculated for the previous timen－2The maximum temperature difference calculated for the previous time.
The frequency regulating quantity of the compressor can be calculated through the formula, and the adjusted frequency can be obtained by adding the frequency regulating quantity to the current frequency. The frequency conversion regulation of the compressor is realized by combining the actual demand and the actual load of the showcase.
After the frequency of the compressor is adjusted according to the maximum temperature difference, the actual temperature of each display cabinet is continuously monitored to determine whether the unit enters refrigeration operation or not, so that a control cycle is entered, and the integrated control method is executed in a cycle mode all the time as long as the unit is not powered off.
The embodiment also provides a showcase integrated control apparatus which comprises the showcase integrated control device.
Example 4
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 a computer-executable instruction is stored, and the computer-executable instruction may execute the method for integrated control of a showcase 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.
As can be seen from the above description, the present invention is directed to solving the problem of distribution of the outdoor unit in the refrigerant circulation amount, and solving various problems of complicated control, complicated parameters, poor reliability, etc. caused by the failure of targeted matching between the showcase and the outdoor unit. The scheme for controlling the frequency conversion of the compressor in the display cabinet integrated control system is provided, so that the cooling capacity of the outer unit is adjusted according to the requirements of the display cabinets, the load requirements of a plurality of display cabinets are met timely, the effects of rapidly lowering the temperature in the cabinets and reducing the energy consumption can be achieved, the energy consumption of the display cabinets in convenience stores is reduced, and the energy-saving effect is reliable.
The integrated control scheme of the invention adopts the compressor to modulate the frequency according to the maximum temperature difference requirement of a plurality of show cases, realizes the distribution of the cooling capacity according to the requirement, and can meet the requirements of show cases with different sizes on the cooling capacity, the large-size show cases have more requirements on the cooling capacity, and the small-size show cases have less requirements on the cooling capacity; or the requirements of show cases with different loads on cooling capacity are different, the show case with large load has more requirements on cooling capacity, and the show case with small load has less requirements on cooling capacity. The invention has the technical effects of simple equipment, easy control, wide adjusting range, independent control and perfect matching of an internal machine and an external machine.
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 (12)
1. An integrated control method for a showcase, comprising:
after the unit enters a refrigerating operation, calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet; wherein the unit is connected with a plurality of showcases;
and determining the maximum temperature difference in the temperature differences of all the display cabinets, and adjusting the frequency of the compressor according to the maximum temperature difference.
2. The method of claim 1, wherein the unit is determined to enter cooling operation by:
monitoring the actual temperature of each display cabinet;
if the actual temperature of any one display cabinet meets the refrigeration condition, the unit enters refrigeration operation; wherein the refrigeration condition is that the temperature difference between the actual temperature and the preset temperature exceeds a preset value.
3. The method of claim 1, wherein calculating the temperature difference between the actual temperature and the preset temperature of each display case comprises:
the actual temperature of each display cabinet is periodically or real-timely monitored through a temperature sensing bulb arranged on each display cabinet;
and calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet.
4. The method of claim 3, wherein determining a maximum temperature differential of the temperature differentials for all of the display cases comprises:
counting the average value of the temperature difference calculated by each display cabinet within the preset time;
the maximum temperature difference is taken as the maximum value among the average values of the temperature differences of all the showcases.
5. The method of claim 1, wherein adjusting the frequency of the compressor based on the maximum temperature differential comprises:
determining frequency adjustment quantity based on a PID (proportion integration differentiation) adjustment method according to the maximum temperature difference calculated at this time and the maximum temperature differences calculated at the previous two times;
and adjusting the frequency of the compressor according to the frequency adjustment amount.
6. The method of claim 1, wherein after adjusting the frequency of the compressor based on the maximum temperature differential, the method further comprises:
and continuously monitoring the actual temperature of each display cabinet to confirm whether the unit enters into the refrigeration operation.
7. An integrated control apparatus for a display case, the apparatus comprising:
the calculating module is used for calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet after the unit enters the refrigeration operation; wherein the unit is connected with a plurality of showcases;
the temperature difference determining module is used for determining the maximum temperature difference in the temperature differences of all the display cabinets;
and the frequency adjusting module adjusts the frequency of the compressor according to the maximum temperature difference.
8. The apparatus of claim 7,
the calculating module is specifically used for monitoring the actual temperature of each display cabinet periodically or in real time through the temperature sensing bulb arranged on each display cabinet; and calculating the temperature difference between the actual temperature and the preset temperature of each display cabinet.
9. The apparatus of claim 8,
the temperature difference determining module is specifically used for counting the average value of the temperature difference calculated by each display cabinet within the preset time; the maximum temperature difference is taken as the maximum value among the average values of the temperature differences of all the showcases.
10. The apparatus of claim 7,
the frequency adjusting module is specifically used for determining a frequency adjusting quantity based on a PID adjusting method according to the maximum temperature difference calculated at this time and the maximum temperature differences calculated at the previous two times; and adjusting the frequency of the compressor according to the frequency adjustment amount.
11. A showcase integrated-control apparatus characterized in that it comprises the integrated-control device of the showcase according to any one of claims 7 to 10.
12. 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 6.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112413973A (en) * | 2020-11-25 | 2021-02-26 | 珠海格力电器股份有限公司 | Control method of refrigerated cabinet and refrigerating system |
| CN113693403A (en) * | 2021-08-24 | 2021-11-26 | 珠海格力电器股份有限公司 | Closed refrigeration display cabinet control method and device and closed refrigeration display cabinet |
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| CN112413973B (en) * | 2020-11-25 | 2021-10-08 | 珠海格力电器股份有限公司 | Control method of refrigerated cabinet and refrigerating system |
| CN113693403A (en) * | 2021-08-24 | 2021-11-26 | 珠海格力电器股份有限公司 | Closed refrigeration display cabinet control method and device and closed refrigeration display cabinet |
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