CN112797725A - Direct-cooling single-cycle refrigerator frequency conversion control method - Google Patents
Direct-cooling single-cycle refrigerator frequency conversion control method Download PDFInfo
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- CN112797725A CN112797725A CN202011623042.2A CN202011623042A CN112797725A CN 112797725 A CN112797725 A CN 112797725A CN 202011623042 A CN202011623042 A CN 202011623042A CN 112797725 A CN112797725 A CN 112797725A
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- compressor
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- variable frequency
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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
Abstract
The invention discloses a direct-cooling single-cycle refrigerator frequency conversion control method, and relates to the technical field of refrigerator frequency conversion control. The method comprises the steps that a refrigerator control board controls an ambient temperature TH obtained from an ambient temperature sensor, a refrigerating temperature TC obtained from a refrigerating temperature sensor and a freezing temperature TD obtained from a freezing temperature sensor; the refrigerator control board judges whether the compressor is required to be started for refrigeration or not according to the refrigerating temperature TC and the freezing temperature TD. The refrigeration capacity and the freezing capacity of the single-cycle direct cooling system refrigerator under different heat load requirements are adjusted by utilizing different rotating speeds of the variable frequency compressors and different temperatures of the provided refrigeration evaporators; on one hand, different requirements of users on refrigeration and freezing temperatures are met, and meanwhile, more energy is saved; on the other hand, the problem that the refrigerating and freezing temperature ratio of different boxes is greatly different due to production process errors is solved.
Description
Technical Field
The invention belongs to the technical field of refrigerator frequency conversion control, and particularly relates to a direct-cooling single-cycle refrigerator frequency conversion control method.
Background
The refrigerator frequency conversion technology is widely applied to the field of refrigerators at present, and is particularly widely applied to air-cooled refrigerators. Because of the higher price of the frequency conversion, the direct-cooling refrigerator is less applied, in particular to the refrigerator with two doors and single circulation and the freezing evaporator of a winding pipe type structure. When the frequency conversion is applied to a two-door single-cycle direct-cooling refrigerator, and a freezing evaporator is a refrigerator with a winding pipe type structure, on one hand, the winding pipe is wound on a freezing lining, the lining is made of ABS or HIPS materials, the heat conduction resistance of the freezing lining is relatively large, and meanwhile, the heat conduction resistance of an evaporator pipeline to a freezing compartment is aggravated due to possible inconsistency of a winding pipe process, so that the refrigerating and freezing temperature configuration difference among different refrigerators is large; on the other hand, in order to improve the heat exchange efficiency of the coiled pipe, most of the current manufacturers adopt D-shaped pipes, and the flattening height of the D-shaped pipes is influenced by the process, so that the difference of the distribution of the refrigerant of the single circulation system in the refrigerating and freezing chamber is caused by process errors, and the refrigerating and freezing temperature configuration difference of different refrigerators is further aggravated.
Except for the difference of the process and the distribution of the refrigerant state, the difference of the use state of a user is large, the door opening frequency of freezing and refrigerating is different, the door opening time is different, and the requirements on the cold quantity are different.
The invention discloses a direct-cooling frequency conversion refrigerator and a rotating speed control method thereof, aiming at a frequency conversion direct-cooling refrigerator control method, and the patent publication No. CN201810765032.9 provides the direct-cooling refrigerator frequency conversion control method aiming at the current frequency conversion problem, and simultaneously controls the compression rotating speed according to the compartment temperature and the ambient temperature. The control method only provides a control method for the direct-cooling frequency conversion refrigerator, the control of the wire tube type or plate tube type evaporator of which the freezing chamber evaporator is arranged in the freezing chamber is more effective, and the problems of the wound tube type evaporator cannot be solved or partially solved.
In order to solve the problems, the invention provides a direct cooling single-cycle refrigerator frequency conversion control method.
Disclosure of Invention
The invention aims to provide a direct-cooling single-cycle refrigerator frequency conversion control method which is used for solving the technical problems in the background technology.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a direct-cooling single-cycle refrigerator frequency conversion control method, which comprises the following processes:
a00: powering on the refrigerator for initialization;
a01: the refrigerator control board controls the ambient temperature TH obtained from an ambient temperature sensor, the refrigerating temperature TC obtained from a refrigerating temperature sensor and the freezing temperature TD obtained from a freezing temperature sensor;
a02: the refrigerator control board judges whether the compressor is required to start refrigeration or not according to the refrigerating temperature TC and the freezing temperature TD; if not, executing A01; if yes, A03 is executed;
a03: the refrigerator control board determines an initial rotating speed according to the ambient temperature TH and the gear rotating speed rule;
wherein the gear speed rule comprises the following steps:
dividing the speed gear of the variable frequency compressor into S1-S2 gears:
when TH is less than T1, the initial gear of the variable frequency compressor is S2;
when TH is more than or equal to T1 and is less than T2, the initial gear of the variable frequency compressor is S5;
when TH is more than or equal to T2 and is less than T3, the initial gear of the variable frequency compressor is S7;
when TH is more than or equal to T3 and is less than T4, the initial gear of the variable frequency compressor is S9;
when TH is more than T4, the initial gear of the variable frequency compressor is S11;
a04: the refrigerator control board adjusts the rotating speed according to the running time N of the compressor, the refrigerating temperature difference delta Tc and the freezing temperature difference delta Td;
wherein, the delta Tc is Tc-Tcoff, and the delta Td is Td-Tdoff; tcoff is the refrigeration stop point, Tdoff is the freezing stop point; tc is the refrigeration real-time temperature, Td is the freezing real-time temperature;
a05: the refrigerator control panel judges whether the shutdown condition is met: tc reaches the refrigeration stop point Tcoff and Td reaches the freezing stop point Tdoff at the same time, and the rotating speed SN1 of the variable frequency compressor is recorded; if yes, A08 is executed; if not, executing A06;
a06: the refrigerator control board judges whether Tc reaches a refrigeration stop point Tcoff or not; if so, controlling the gear of the rotating speed of the variable frequency compressor to be lifted by 2 steps by the refrigerator control board, recording the rotating speed SN2 of the variable frequency compressor and executing A08; if not, executing A07;
a07: the refrigerator control board judges whether Td reaches a freezing shutdown point Tdoff or not; if so, controlling the rotating speed gear of the variable frequency compressor to reduce by 2 gears by the refrigerator control board, recording the rotating speed SN2 of the variable frequency compressor and executing A08; if not, executing A04;
a08: judging whether door opening or gear adjustment exists before starting up the machine next time; if yes, A04 is executed; if not, the refrigerator control board controls and keeps the running of the rotating speed SN1 or SN2 after the last startup adjustment.
As a preferred embodiment, a03 has T1 ═ 16 ℃, T2 ═ 25 ℃, T3 ═ 32 ℃, T4 ═ 38 ℃;
in addition, S1 is 1200rpm, S2 is 1500rpm, S3 is 1800rpm, S4 is 2100rpm, S5 is 2400rpm, S6 is 2700rpm, S7 is 3000rpm, S8 is 3300rpm, S9 is 3600rpm, S10 is 3720rpm, S11 is 3900rpm, and S12 is 4120 rpm.
As a preferable technical solution, after the variable frequency compressor is started in a03, the refrigerator control board records the compressor running time N.
The invention has the following beneficial effects:
the refrigeration capacity and the freezing capacity of the single-cycle direct cooling system refrigerator under different heat load requirements are adjusted by utilizing different rotating speeds of the variable frequency compressors and different temperatures of the provided refrigeration evaporators; on one hand, different requirements of users on refrigeration and freezing temperatures are met, and meanwhile, more energy is saved; on the other hand, the problem that the refrigerating and freezing temperature ratio of different boxes is greatly different due to production process errors is solved.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced 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 that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a direct cooling single cycle refrigerator frequency conversion control method of the present invention;
FIG. 2 is a schematic view of a conventional two-door refrigerator according to the present invention;
FIG. 3 is a schematic diagram of a conventional direct-cooling two-door refrigerator refrigeration system according to the present invention;
fig. 4 is a schematic structural diagram of a direct cooling single cycle refrigerator frequency conversion control system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
For clearly understanding the technical solution of the present invention, as shown in fig. 2, it is a schematic structural diagram of a conventional refrigerating two-door refrigerator, which includes a freezing compartment 1, a refrigerating compartment 2, and a refrigerating evaporator 4 located at the back of the refrigerating compartment 2 and is a plate-and-tube evaporator; the freezing evaporator 7 is wound on the inner liner of the freezing liner, and the refrigerating evaporator 4 and the freezing evaporator 7 respectively provide cold energy for the refrigerating chamber 2 and the freezing chamber 1;
referring to fig. 3, a schematic diagram of a conventional direct-cooling two-door refrigerator refrigeration system is shown, in which the refrigeration system is sequentially connected to a compressor, an anti-condensation pipe, a condenser, a filter, a capillary tube, a freezing evaporator, a refrigerating evaporator and a compressor to form a complete cycle. The compressor compresses the refrigerant into high-temperature high-pressure gas, the high-temperature high-pressure gas enters the anti-condensation pipe-condenser for heat dissipation, the high-temperature high-pressure gas is throttled by the capillary tube to form low-temperature low-pressure liquid, the low-temperature low-pressure liquid firstly enters the freezing evaporator and then enters the refrigerating evaporator for evaporation and heat absorption, the temperature of the refrigerating chamber and the freezing chamber of the refrigerator is respectively reduced, the low-temperature low-pressure gas obtained after the refrigerant is evaporated and absorbs heat is reheated and enters the compressor for recomp. In the cold quantity matching design process, the areas of the refrigeration evaporator and the refrigeration evaporator are matched according to the heat leakage load of the refrigeration chamber and the heat leakage load of the freezing chamber at a certain or several external environment temperatures of the refrigerator, so that cold quantity matching in different states is realized. From the refrigeration principle, it can be clearly known that the refrigeration evaporator and the freezing evaporator are throttled by the same capillary tube, and the temperatures of the evaporators are the same and cannot be independently adjusted. A series of drawbacks in the technical background arise.
In fact, the rotation speed of the inverter compressor is increased, and the temperatures of the refrigerating evaporator and the freezing evaporator are simultaneously reduced, so that the temperature difference Δ t between the indoor hot air and the evaporator is increased, the cooling capacity Qc ═ Ac ═ Δ tc and Qd ═ Ad ═ Δ td supplied to each compartment by the evaporator are relatively high, and therefore, the difference between the refrigerating compartment air temperature and the refrigerating evaporator temperature is large, namely, Δ tc is far larger than Δ td.
If the rotation speed of the inverter compressor is not changed, assuming that the rotation speed is Δ tc1 and Δ td1, the evaporator temperature is-18 ℃, the refrigerating air temperature is 5 ℃, and the freezing air temperature is-17 ℃, Δ tc1 is 23 ℃ and Δ td1 is 1 ℃. When the rotating speed of the compressor is increased, the corresponding refrigerating evaporator temperature and the freezing evaporator temperature are equally decreased by-20 ℃, and the obtained delta tc2 is 25 and delta td2 is 3 again, at this time, the heat transfer efficiency of the freezing chamber is obviously increased due to the decrease of the evaporator temperature, and the influence on the refrigeration is small. In this case, if the freezer compartment is hot, the condition of the freezer compartment being hot can be adjusted. And vice versa. If according to prior art compressor frequency conversion control, utilize ambient temperature and longest boot time alone to carry out rotational speed control to frequency conversion compressor, can't realize cold-stored and freezing temperature demand matching under the different ring temperatures again, often can appear freezing too low, or cold-stored problem on the low side. For example, at 16℃, the refrigeration setting is 4℃ and the freezing setting is-18℃, and due to the above process reasons, some refrigerators may be operated to refrigerate at 3℃ and freeze at-18℃ and some may be operated to freeze at 5℃ and freeze at-20℃. The best match of refrigeration and freezing cannot be met;
referring to fig. 1, to solve the above problem, the present invention provides a direct cooling single cycle refrigerator frequency conversion control method, which includes the following steps:
in order to ensure the normal application of the control method, please refer to fig. 4, which also provides a direct-cooling single-cycle refrigerator frequency conversion control system, including an ambient temperature sensor 3 installed on the top of the refrigerator for ambient temperature TH, a refrigerating temperature sensor 5 installed inside the refrigerating chamber 2 for detecting refrigerating temperature TC, and a freezing temperature sensor 6 installed inside the freezing chamber 1 for detecting freezing temperature TD; the refrigerator also comprises a variable frequency compressor and a refrigerator control board 8; the refrigerator control panel is respectively connected with the environment temperature sensor 3, the refrigerating temperature sensor 5, the freezing temperature sensor 6 and the variable frequency compressor through electric signals;
a00: powering on the refrigerator for initialization;
a01: the refrigerator control board controls the ambient temperature TH obtained from an ambient temperature sensor, the refrigerating temperature TC obtained from a refrigerating temperature sensor and the freezing temperature TD obtained from a freezing temperature sensor;
a02: the refrigerator control board judges whether the compressor is required to start refrigeration or not according to the refrigerating temperature TC and the freezing temperature TD; if not, executing A01; if yes, A03 is executed;
a03: the refrigerator control board determines an initial rotating speed according to the ambient temperature TH and the gear rotating speed rule;
wherein, gear rotational speed rule includes as follows:
dividing the speed gear of the variable frequency compressor into S1-S2 gears:
when TH is less than T1, the initial gear of the variable frequency compressor is S2;
when TH is more than or equal to T1 and is less than T2, the initial gear of the variable frequency compressor is S5;
when TH is more than or equal to T2 and is less than T3, the initial gear of the variable frequency compressor is S7;
when TH is more than or equal to T3 and is less than T4, the initial gear of the variable frequency compressor is S9;
when TH is more than T4, the initial gear of the variable frequency compressor is S11;
T1＝16℃，T2＝25℃，T3＝32℃，T4＝38℃；S1＝1200rpm，S2＝1500rpm，S3＝1800rpm，S4＝2100rpm，S5＝2400rpm，S6＝2700rpm，S7＝3000rpm，S8＝3300rpm，S9＝3600rpm，S10＝3720rpm，S11＝3900rpm，S12＝4120rpm；
a04: the refrigerator control board adjusts the rotating speed according to the running time N of the compressor, the refrigerating temperature difference delta Tc and the freezing temperature difference delta Td; in fact, after the inverter compressor is started, the refrigerator control board records the compressor running time N;
wherein, the delta Tc is Tc-Tcoff, and the delta Td is Td-Tdoff; tcoff is the refrigeration stop point, Tdoff is the freezing stop point; tc is the refrigeration real-time temperature, Td is the freezing real-time temperature;
a05: the refrigerator control panel judges whether the shutdown condition is met: tc reaches the refrigeration stop point Tcoff and Td reaches the freezing stop point Tdoff at the same time, and the rotating speed SN1 of the variable frequency compressor is recorded; if yes, A08 is executed; if not, executing A06;
a06: the refrigerator control board judges whether Tc reaches a refrigeration stop point Tcoff or not; if so, controlling the gear of the rotating speed of the variable frequency compressor to be lifted by 2 steps by the refrigerator control board, recording the rotating speed SN2 of the variable frequency compressor and executing A08; if not, executing A07;
a07: the refrigerator control board judges whether Td reaches a freezing shutdown point Tdoff or not; if so, controlling the rotating speed gear of the variable frequency compressor to reduce by 2 gears by the refrigerator control board, recording the rotating speed SN2 of the variable frequency compressor and executing A08; if not, executing A04;
a08: judging whether door opening or gear adjustment exists before starting up the machine next time; if yes, A04 is executed; if not, the refrigerator control board controls and keeps the running of the rotating speed SN1 or SN2 after the last startup adjustment.
When the refrigerating system is actually used, the refrigerating cold quantity and the freezing cold quantity of the single-cycle direct cooling system refrigerator under different heat load requirements are adjusted by utilizing different rotating speeds of the variable frequency compressors and different temperatures of the provided refrigerating evaporators; on one hand, different requirements of users on refrigeration and freezing temperatures are met, and meanwhile, more energy is saved; on the other hand, the problem that the refrigerating and freezing temperature ratio of different boxes is greatly different due to production process errors is solved.
It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
In addition, it is understood by those skilled in the art that all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing associated hardware, and the corresponding program may be stored in a computer-readable storage medium.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (3)
1. A direct cooling single cycle refrigerator frequency conversion control method is characterized by comprising the following processes:
a00: powering on the refrigerator for initialization;
a01: the refrigerator control board controls the ambient temperature TH obtained from an ambient temperature sensor, the refrigerating temperature TC obtained from a refrigerating temperature sensor and the freezing temperature TD obtained from a freezing temperature sensor;
a02: the refrigerator control board judges whether the compressor is required to start refrigeration or not according to the refrigerating temperature TC and the freezing temperature TD; if not, executing A01; if yes, A03 is executed;
a03: the refrigerator control board determines an initial rotating speed according to the ambient temperature TH and the gear rotating speed rule;
wherein the gear speed rule comprises the following steps:
dividing the speed gear of the variable frequency compressor into S1-S2 gears:
when TH is less than T1, the initial gear of the variable frequency compressor is S2;
when TH is more than or equal to T1 and is less than T2, the initial gear of the variable frequency compressor is S5;
when TH is more than or equal to T2 and is less than T3, the initial gear of the variable frequency compressor is S7;
when TH is more than or equal to T3 and is less than T4, the initial gear of the variable frequency compressor is S9;
when TH is more than T4, the initial gear of the variable frequency compressor is S11;
a04: the refrigerator control board adjusts the rotating speed according to the running time N of the compressor, the refrigerating temperature difference delta Tc and the freezing temperature difference delta Td;
wherein, the delta Tc is Tc-Tcoff, and the delta Td is Td-Tdoff; tcoff is the refrigeration stop point, Tdoff is the freezing stop point; tc is the refrigeration real-time temperature, Td is the freezing real-time temperature;
a05: the refrigerator control panel judges whether the shutdown condition is met: tc reaches the refrigeration stop point Tcoff and Td reaches the freezing stop point Tdoff at the same time, and the rotating speed SN1 of the variable frequency compressor is recorded; if yes, A08 is executed; if not, executing A06;
a06: the refrigerator control board judges whether Tc reaches a refrigeration stop point Tcoff or not; if so, controlling the gear of the rotating speed of the variable frequency compressor to be lifted by 2 steps by the refrigerator control board, recording the rotating speed SN2 of the variable frequency compressor and executing A08; if not, executing A07;
a07: the refrigerator control board judges whether Td reaches a freezing shutdown point Tdoff or not; if so, controlling the rotating speed gear of the variable frequency compressor to reduce by 2 gears by the refrigerator control board, recording the rotating speed SN2 of the variable frequency compressor and executing A08; if not, executing A04;
a08: judging whether door opening or gear adjustment exists before starting up the machine next time; if yes, A04 is executed; if not, the refrigerator control board controls and keeps the running of the rotating speed SN1 or SN2 after the last startup adjustment.
2. The frequency conversion control method for the direct cooling single-cycle refrigerator according to claim 1, wherein T1 ═ 16 ℃, T2 ═ 25 ℃, T3 ═ 32 ℃, T4 ═ 38 ℃ in A03;
in addition, S1 is 1200rpm, S2 is 1500rpm, S3 is 1800rpm, S4 is 2100rpm, S5 is 2400rpm, S6 is 2700rpm, S7 is 3000rpm, S8 is 3300rpm, S9 is 3600rpm, S10 is 3720rpm, S11 is 3900rpm, and S12 is 4120 rpm.
3. The frequency conversion control method for direct-cooling single-cycle refrigerator according to claim 1 or 2, wherein after the frequency conversion compressor is started in A03, the refrigerator control board records the running time N of the compressor.
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| CN115096041A (en) * | 2022-06-29 | 2022-09-23 | 创维电器股份有限公司 | Method for controlling starting operation of compressor of inverter refrigerator |
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| CN112797725B (en) | 2022-05-10 |
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