CN111407123A - Control method for reducing temperature fluctuation, temperature control device and display cabinet - Google Patents
Control method for reducing temperature fluctuation, temperature control device and display cabinet Download PDFInfo
- Publication number
- CN111407123A CN111407123A CN202010335410.7A CN202010335410A CN111407123A CN 111407123 A CN111407123 A CN 111407123A CN 202010335410 A CN202010335410 A CN 202010335410A CN 111407123 A CN111407123 A CN 111407123A
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- Prior art keywords
- temperature
- opening degree
- preset
- throttling device
- evaporator
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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
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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
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a control method for reducing temperature fluctuation, a temperature control device and a display cabinet, which comprise the following steps: when the temperature of the heat exchange chamber is smaller than or equal to a preset inflection point temperature corresponding to the target temperature, judging whether the temperature difference value of the inlet and the outlet of the evaporator is larger than or equal to a second preset temperature difference, if so, controlling the throttling device to keep the opening at the preset opening; if not, controlling the throttling device to reduce the opening degree step by step to operate. The invention sets the preset inflection point temperature according to the target temperature to divide the temperature in the cabinet into intervals, controls different conditions of a throttling device, namely an electronic expansion valve in each temperature interval, controls the flow of the throttling device by considering the superheat degree of an inlet and an outlet of an evaporator, synchronously sets the lowest throttling opening degree of the throttling device, and when a logic program is operated to the lowest throttling opening degree, the throttling device operates at the lowest throttling opening degree, so that the temperature fluctuation in each display cabinet is stable.
Description
Technical Field
The invention relates to the field of refrigeration control, in particular to a control method for reducing temperature fluctuation, a temperature control device and a display cabinet.
Background
The showcase belongs to light commercial products, and merchants generally use the showcase to display commodities needing refrigeration and the like. At present, most manufacturers design the showcase, the temperature range can meet the national standard, the integrity of the temperature control of the product is not considered, the use of a throttling device is limited by the influences of type selection, environment, working conditions and the like, the control precision of the thermostatic expansion valve is low, the temperature fluctuation in the showcase is large in the operation process, the temperature in the showcase cannot be kept in the ideal temperature range, more abnormity occurs, the power consumption is large, energy is not saved, and even the economic loss of users is caused.
Disclosure of Invention
The invention provides a control method for reducing temperature fluctuation, a temperature control device and a display cabinet, aiming at solving the technical problem of large temperature fluctuation of the display cabinet in the prior art.
The technical scheme adopted by the invention is as follows:
the invention provides a control method for reducing temperature fluctuation, which comprises the following steps:
when the temperature of the heat exchange chamber is smaller than or equal to a preset inflection point temperature corresponding to the target temperature, judging whether the temperature difference value of the inlet and the outlet of the evaporator is larger than or equal to a second preset temperature difference, if so, controlling the throttling device to keep the opening at the preset opening; if not, controlling the throttling device to reduce the opening degree step by step to operate.
Further, the throttle device gradually reduces the opening degree according to a second preset time period, and when the opening degree is reduced to a preset minimum opening degree, the throttle device is kept to operate at the preset minimum opening degree.
When the temperature of the heat exchange chamber is higher than the preset inflection point temperature corresponding to the target temperature, judging whether the temperature difference of an inlet and an outlet of the evaporator is higher than or equal to a first preset temperature difference, and if so, controlling the throttling device to operate at the maximum preset opening; if not, controlling the throttling device to reduce the opening degree step by step according to a first preset time period to operate.
Furthermore, when the throttle device gradually reduces the opening degree to the preset opening degree, the throttle device is kept running at the preset opening degree.
Preferably, the second preset time period is greater than the first preset time period.
The invention also provides a temperature control device, and the fluctuation of the temperature heat exchange chamber of the temperature control device is reduced by using the control method for reducing the temperature fluctuation.
The temperature control device comprises: the system comprises an evaporator, an inlet temperature sensing bulb for detecting the inlet temperature of the evaporator, an outlet temperature sensing bulb for detecting the outlet temperature of the evaporator, a heat exchange chamber temperature sensing bulb for detecting the temperature of a heat exchange chamber and a throttling device.
Preferably, the throttling device is an electronic expansion valve.
The invention also provides a display cabinet which comprises the temperature control device, and the temperature of the heat exchange chamber is the temperature in the cabinet.
Compared with the prior art, the invention sets the preset inflection point temperature according to the target temperature to divide the temperature in the cabinet into a quick cooling interval and a low-speed cooling interval, different condition control of the throttling device, namely an electronic expansion valve, is carried out in each temperature interval, when the real-time temperature in the cabinet is monitored to be below the preset inflection point temperature, the throttling device slowly regulates and controls the opening degree at the moment of reaching the preset inflection point temperature to approach the target temperature Ttarget, the flow of the throttling device is controlled by considering the superheat degree of an inlet and an outlet of an evaporator, the lowest throttling opening degree of the throttling device is synchronously set, and when a logic program runs to the lowest throttling opening degree, the throttling device runs at the lowest opening degree, so that the temperature fluctuation in each display cabinet is stable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a line graph of a specific control in an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
The invention provides a control method for reducing temperature fluctuation, wherein a temperature control device is a display cabinet, the temperature of a heat exchange chamber is the temperature in the display cabinet, and the control method comprises the following steps: setting a target temperature, when the temperature in the cabinet is less than or equal to a preset inflection point temperature corresponding to the target temperature, indicating that a rapid cooling stage has passed, judging whether the temperature difference value of an inlet and an outlet of the evaporator is greater than or equal to a second preset temperature difference value, if so, controlling the throttling device to keep the opening of the throttling device at a preset opening, otherwise, controlling the throttling device to gradually reduce the opening to operate, and when the throttling device gradually reduces the opening to a preset minimum opening, keeping the throttling device to operate at a preset minimum opening. The invention sets a preset inflection point temperature according to a target temperature to divide the temperature in the cabinet into a quick cooling interval and a low cooling interval, different condition control of a throttling device, namely an electronic expansion valve, is carried out in each temperature interval, when the real-time temperature in the cabinet is monitored to be below the preset inflection point temperature, the throttling device slowly regulates and controls the opening degree at the moment of reaching the preset inflection point temperature, mainly approaches the target temperature Ttarget, controls the flow of the throttling device by considering the superheat degree of an inlet and an outlet of an evaporator, synchronously sets the minimum throttling opening degree of the throttling device, and when a logic program runs to the minimum throttling opening degree, the throttling device runs at the minimum opening degree, so that the temperature fluctuation in each display cabinet is stable.
When the temperature in the cabinet is higher than the preset inflection point temperature corresponding to the target temperature, the cabinet is in a rapid cooling stage, whether the temperature difference of an inlet and an outlet of the evaporator is higher than or equal to a first preset temperature difference is judged, if yes, the throttling device is controlled to operate at the maximum preset opening degree, if not, the throttling device is controlled to operate at the opening degree reduced step by step, and when the throttling device reduces the opening degree step by step to the preset opening degree, the throttling device is kept to operate at the preset opening degree. The throttling device operates at the maximum preset opening degree or the preset opening degree in the rapid cooling stage so as to achieve the effect of rapid cooling.
As shown in fig. 1, the specific embodiment is as follows:
kmax, the preset maximum opening of the electronic expansion valve; kmin-the preset minimum opening of the electronic expansion valve;
kk is the preset opening degree of the electronic expansion valve at the inflection point K; ttarget-target temperature set for the display case, ° C; tk target — preset inflection temperature, deg.c;
the temperature control precision of the display cabinet is DEG C; t inflection point-preset inflection temperature, deg.c;
tin-evaporator inlet temperature, deg.C; tout-evaporator outlet temperature, deg.C;
△ T-the current inlet and outlet temperature difference of the evaporator, DEG C;
△ T1-the first predetermined temperature differential, DEG C, △ T2-the second predetermined temperature differential, DEG C.
When the display cabinet meets the requirement of starting operation, the inlet temperature Tin of the evaporator, the outlet temperature Tout of the evaporator and the temperature T cabinet in the cabinet are synchronously detected and collected, the relative relation between △ T and △ T1 and △ T2 and the relative relation between the T cabinet and a T inflection point are synchronously detected according to logic, and the operation step interval of the electronic expansion valve is controlled according to the relative relation and a control mode, so that the requirement of temperature control is met.
At this moment, the real-time temperature in the cabinet is greatly different from the target temperature, the temperature needs to be quickly reduced so as to respond to quick cooling of the food in the display cabinet and ensure the quality of the food, and the control strategy is as follows:
when the T cabinet is more than the T inflection point and △ T is more than △ T1, the temperature in the cabinet is higher, the electronic expansion valve operates at the maximum opening Kmax, the flow of the unit is increased, the temperature in the cabinet is quickly reduced, and the real-time monitoring and the quick response are synchronously performed according to the regulation period;
when the T cabinet is greater than the T inflection point and △ T is approximately equal to △ T1, the temperature in the cabinet is continuously reduced, the temperature difference of the inlet and the outlet of the heat exchanger is close to the target temperature difference, and the electronic expansion valve maintains the current opening degree for regulation and control;
when the T cabinet is greater than the T inflection point, △ T is less than △ T1, after the showcase runs for a period of time at the maximum opening Kmax, when the electronic expansion valve is adjusted, the program monitors the size of the inlet-outlet temperature difference and the target temperature difference T1 of the evaporator in real time, at the moment, △ T is less than △ T1, the opening of the electronic expansion valve is reduced step by step in a first preset time period, namely, the opening is reduced once every first preset time, so that the inlet-outlet temperature difference is in a controllable range, and at the moment, the step number of the electronic expansion valve is adjusted at a preset value Kmax-Kk.
The showcase further operates to the temperature inflection point Tk, when the Ttarget + is less than the Ttarget and the Ttarget is less than the Ttarget, the difference between the real-time temperature and the target temperature in the showcase is within +/-DEG C, the temperature in the showcase is close to the target temperature, the control strategy takes the stability of the temperature in the showcase as a main control point, the control strategy changes, the approach of the target temperature is taken as a main control strategy, and the control strategy at the stage is as follows:
when the T cabinet is less than or equal to the T inflection point and △ T is more than △ T2, the display cabinet further operates, the real-time temperature difference △ T between the inlet and the outlet of the evaporator needs to be controlled according to the target temperature △ T2, the control period is increased, the control is carried out in a second preset time period, namely, the opening degree is reduced once every second preset time, the opening degree response of the electronic expansion valve is slowed, the current opening degree is maintained for a long time, and the control opening degree at the moment is continuously kept at Kk for regulation and control.
When the T cabinet is not more than the T inflection point and △ T is approximately equal to △ T2, the temperature in the cabinet continuously approaches the target temperature, the temperature difference between the inlet and the outlet of the heat exchanger approaches the target temperature difference △ T2, and the electronic expansion valve maintains the current opening degree for regulation and control;
when the T cabinet is less than or equal to the T inflection point and △ T is less than △ T2, the opening of the display cabinet is continuously reduced when △ T is less than △ T2, and when the opening of the electronic expansion valve is reduced to Kmin, the electronic expansion valve is continuously operated at the lowest opening to approach the target temperature.
The showcase control logic is divided into two control intervals according to the temperature in the showcase monitored by the system in real time, and when the temperature difference is larger in the early stage, the opening degree of the electronic expansion valve is controlled by the superheat degree of an inlet and an outlet of the evaporator, so that the temperature is quickly reduced; when the subsequent cabinet internal temperature Ttarget is more than or equal to Tcabinet and less than Ttarget, the approach target temperature is taken as a control strategy, and the lowest opening degree is set for avoiding the too low opening degree, so that the temperature in the cabinet is always kept at the required optimal temperature. The control method is characterized in that different conditions and different opening degree control modes of the electronic expansion valve in different temperature intervals are adopted when the electronic expansion valve is controlled, so that the problem of impact of flow on the electronic expansion valve is reduced, and the temperature control device is more energy-saving and stable in operation.
According to the control, the system can run more stably and energy-saving, the temperature of the display cabinet is kept in the stable optimal temperature, the food in the cabinet reaches the optimal storage temperature, and the control balance can be quickly restored even if the temperature balance is broken.
As shown in fig. 1, the present invention further provides a temperature control device, which reduces temperature fluctuation by using the above control method, including: the refrigerator comprises an evaporator 1, an inlet temperature sensing bulb 11 for detecting the inlet temperature of the evaporator, an outlet temperature sensing bulb 12 for detecting the outlet temperature of the evaporator, a cabinet temperature sensing bulb 13 for detecting the cabinet temperature, a throttling device 2, and other common parts for a refrigeration system, such as a filter 3, an electromagnetic valve 4 and an outdoor unit 5 with a condenser.
The invention also provides a display cabinet comprising the temperature control device.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A control method for reducing temperature fluctuations, comprising the steps of:
when the temperature of the heat exchange chamber is smaller than or equal to a preset inflection point temperature corresponding to the target temperature, judging whether the temperature difference value of the inlet and the outlet of the evaporator is larger than or equal to a second preset temperature difference, if so, controlling the throttling device to keep the opening at the preset opening; if not, controlling the throttling device to reduce the opening degree step by step to operate.
2. The control method for reducing temperature fluctuation according to claim 1, wherein the throttle means decreases the opening degree stepwise according to a second preset time period, and when the opening degree decreases to a preset minimum opening degree, the operation is maintained at the preset minimum opening degree.
3. The control method for reducing temperature fluctuation according to claim 2, wherein when the temperature of the heat exchange chamber is higher than a predetermined inflection point temperature corresponding to the target temperature, it is determined whether the difference between the inlet and outlet temperatures of the evaporator is greater than or equal to a first predetermined temperature difference, and if so, the throttling device is controlled to operate at a maximum predetermined opening.
4. The control method for reducing temperature fluctuation according to claim 3, wherein if not, the throttling means is controlled to operate by gradually reducing the opening degree according to a first preset time period.
5. The control method for reducing temperature fluctuation according to claim 4, wherein the throttle means is kept operating at the preset opening degree while gradually reducing the opening degree to the preset opening degree.
6. The control method for reducing temperature fluctuations of claim 4, in which the second predetermined period of time is greater than the first predetermined period of time.
7. A temperature control device, characterized in that the temperature fluctuation of a heat exchange chamber of the temperature control device is reduced by using the control method for reducing temperature fluctuation according to any one of claims 1 to 6.
8. The temperature control device of claim 7, comprising: the system comprises an evaporator, an inlet temperature sensing bulb for detecting the inlet temperature of the evaporator, an outlet temperature sensing bulb for detecting the outlet temperature of the evaporator, a heat exchange chamber temperature sensing bulb for detecting the temperature of a heat exchange chamber and a throttling device.
9. The temperature control device of claim 8, wherein the throttling device is an electronic expansion valve.
10. A display case comprising the temperature control apparatus of any one of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010335410.7A CN111407123A (en) | 2020-04-24 | 2020-04-24 | Control method for reducing temperature fluctuation, temperature control device and display cabinet |
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| CN202010335410.7A CN111407123A (en) | 2020-04-24 | 2020-04-24 | Control method for reducing temperature fluctuation, temperature control device and display cabinet |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112167891A (en) * | 2020-09-25 | 2021-01-05 | 珠海格力电器股份有限公司 | Integrated control method, device and equipment for display cabinet |
| CN112665249A (en) * | 2020-12-28 | 2021-04-16 | 江苏拓米洛环境试验设备有限公司 | Multi-chamber control method and device for refrigeration system and refrigeration system |
| CN113280541A (en) * | 2021-06-29 | 2021-08-20 | 江苏拓米洛环境试验设备有限公司 | Control method and device for multi-chamber electronic expansion valve of refrigeration system and refrigeration system |
| CN114165979A (en) * | 2021-09-30 | 2022-03-11 | 海信家电集团股份有限公司 | Refrigerator and operation control method for unfreezing function of refrigerator |
| CN114992943A (en) * | 2022-05-30 | 2022-09-02 | 海信（山东）冰箱有限公司 | Refrigerator and refrigeration system control method |
| CN115200274A (en) * | 2022-07-21 | 2022-10-18 | 西安交通大学 | Refrigerator refrigerating capacity adjusting method |
| CN115289753A (en) * | 2022-07-19 | 2022-11-04 | 中山市凯腾电器有限公司 | Control method, device, equipment and medium for multi-temperature-zone refrigerator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112167891A (en) * | 2020-09-25 | 2021-01-05 | 珠海格力电器股份有限公司 | Integrated control method, device and equipment for display cabinet |
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| CN115289753A (en) * | 2022-07-19 | 2022-11-04 | 中山市凯腾电器有限公司 | Control method, device, equipment and medium for multi-temperature-zone refrigerator |
| CN115289753B (en) * | 2022-07-19 | 2023-05-05 | 中山市凯腾电器有限公司 | Control method, device, equipment and medium for multi-temperature-zone refrigerator |
| CN115200274A (en) * | 2022-07-21 | 2022-10-18 | 西安交通大学 | Refrigerator refrigerating capacity adjusting method |
| CN115200274B (en) * | 2022-07-21 | 2023-07-18 | 西安交通大学 | Refrigerator refrigerating capacity adjusting method |
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Application publication date: 20200714 |