CN115962592A - Start control method for cascade refrigeration system of storage box - Google Patents
Start control method for cascade refrigeration system of storage box Download PDFInfo
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Abstract
The application provides a start control method of a cascade refrigeration system of a preservation box, which comprises the following steps: step S10, the storage box is powered on, and a high-temperature compressor of the cascade refrigeration system is started at a first set frequency RH 0; s11, determining the target time of the operation of the high-temperature compressor so as to achieve the starting condition of the low-temperature compressor; s12, determining the target frequency of full-load operation of the high-temperature compressor and the low-temperature compressor of the cascade refrigeration system; s13, determining a frequency increasing and decreasing mode, and controlling the high-temperature compressor to increase and decrease the frequency to the target frequency; step S14, the running time of the high-temperature compressor reaches the target time, and the low-temperature compressor is started at a second set frequency RL 0; s15, determining a frequency increasing and decreasing mode, and controlling the frequency increasing and decreasing of the low-temperature compressor to the target frequency; and a step S16, the compartment actual temperature Td reaches the compartment set temperature Ts.
Description
Technical Field
The application relates to the technical field of refrigeration, in particular to a starting control method of a cascade refrigeration system of a preservation box.
Background
In the refrigeration technology field, in order to obtain low temperature, a cascade refrigeration system is often used, and a high-temperature working medium is used as a low-temperature working medium for cooling. However, the low-temperature compressor has over-high exhaust pressure which exceeds the operation condition of the compressor, and the exhaust pressure is too low, the refrigerant flow is reduced, and the temperature pulling speed of the storage box is slow. Therefore, real-time regulation of the compressor rotation speed is required. In the related art variable-frequency low-temperature product, the rotation speed of the compressor is controlled mainly by a preset gear and a temperature feedback mechanism of a sensor in a compartment, and the change of the rotation speed of the compressor is realized through a control program. However, when the compressor is operated at a certain rotation speed, if the temperature reduction speed of the compartment is slow, the cooling time is too long at the rotation speed, and the actual cooling effect is not ideal, the actual use effect and the power consumption of a user are adversely affected. Therefore, the compressor needs to be reasonably frequency-modulated, and normal refrigeration and rapid temperature rise of the compartment are realized on the premise of ensuring reliable operation of the compressor.
Disclosure of Invention
The application aims to provide a starting control method of a cascade refrigeration system of a storage box, and aims to realize normal refrigeration and quick temperature rise of a storage box chamber.
The application provides a start control method of a cascade refrigeration system of a preservation box, which comprises the following steps:
step S10, the storage box is powered on, and a high-temperature compressor of the cascade refrigeration system is started at a first set frequency RH 0;
step S11, determining the target time of the high-temperature compressor to reach the starting condition of the low-temperature compressor;
step S12, determining target frequency of full load operation of the high-temperature compressor and a low-temperature compressor of the cascade refrigeration system;
s13, determining a frequency raising and reducing mode, and controlling the frequency raising and reducing of the high-temperature compressor to the target frequency;
step S14, when the running time of the high-temperature compressor reaches the target time, the low-temperature compressor is started at a second set frequency RL 0;
s15, determining a frequency raising and reducing mode, and controlling the frequency raising and reducing of the low-temperature compressor to the target frequency;
and S16, enabling the compartment actual temperature Td to reach a compartment set temperature Ts.
In the start-up control method of some embodiments,
in the step S10, the high temperature compressor of the cascade refrigeration system is started at a first set frequency RH0 according to the actual compartment temperature Td and the set compartment temperature Ts of the compartment of the storage box;
in the step S11, determining a target time for operating the high-temperature compressor according to an ambient temperature Ta and the actual compartment temperature Td so as to achieve a starting condition of the low-temperature compressor;
in the step S12, determining target frequencies of full-load operation of the high-temperature compressor and the low-temperature compressor of the cascade refrigeration system according to the ambient temperature Ta and the compartment set temperature Ts;
in the step S13, a frequency raising and reducing manner is determined according to the suction pressure, the discharge pressure, or the suction-discharge pressure difference of the high-temperature compressor, and the high-temperature compressor is controlled to raise and lower the frequency to a target frequency;
in the step S15, a frequency up-down mode is determined according to the suction pressure, the discharge pressure, or the suction-discharge pressure difference of the low-temperature compressor, and the low-temperature compressor is controlled to be frequency up-down to the target frequency.
In some embodiments of the start-up control method, in the step S10, after the storage box is powered on for a first time period, the actual temperature Td of the compartment is detected, and if the actual temperature Td of the compartment is higher than the set temperature Ts of the compartment by a predetermined temperature value Δ T, that is, td ≧ Ts + Δt, the high-temperature compressor is started at the first set frequency RH 0.
In the start-up control method of some embodiments,
the first time period is 3-15 min; and/or
The predetermined temperature value Δ T is 3 ℃.
In the start-up control method of some embodiments, in the step S11, the target time for the high temperature compressor to operate is determined according to a temperature range in which the ambient temperature Ta is located and a temperature range in which the compartment actual temperature Td is located.
In the start-up control method of some embodiments, the lower the ambient temperature Ta and the compartment actual temperature Td, the shorter the target time for the high-temperature compressor to operate, and the higher the ambient temperature Ta and the compartment actual temperature Td, the longer the target time for the high-temperature compressor to operate.
In the start-up control method according to some embodiments, in step S12, the target frequencies of the full-load operation of the high-temperature compressor and the low-temperature compressor are determined according to the temperature range in which the ambient temperature Ta is located and the temperature range in which the compartment set temperature Ts is located.
In the start-up control method of some embodiments, the lower the ambient temperature Ta and the higher the compartment set temperature Ts, the lower the target frequency at the time of full-load operation of the high-temperature compressor and the low-temperature compressor, and the higher the ambient temperature Ta and the lower the compartment set temperature Ts, the higher the target frequency at the time of full-load operation of the high-temperature compressor and the low-temperature compressor.
In the start-up control method of some embodiments, in the step S13,
determining the lifting frequency of the high-temperature compressor according to the pressure range where the exhaust pressure of the high-temperature compressor is located; and/or
And adjusting the lifting frequency of the high-temperature compressor by detecting the exhaust pressure of the high-temperature compressor in real time.
In the start-up control method of some embodiments, the higher the discharge pressure of the high temperature compressor, the lower the up-conversion rate, and the higher the down-conversion rate, the lower the discharge pressure of the high temperature compressor, the higher the up-conversion rate, and the lower the down-conversion rate.
In the start-up control method of some embodiments,
the first set frequency RH0 is 30-40 Hz; and/or
The second set frequency RL0 is 25-35 Hz.
In the start-up control method of some embodiments, in said step S15,
determining the lifting frequency of the low-temperature compressor according to the pressure range of the exhaust pressure of the low-temperature compressor; and/or
And adjusting the lifting frequency of the low-temperature compressor by detecting the exhaust pressure of the low-temperature compressor in real time.
In the start-up control method of some embodiments, the higher the discharge pressure of the low-temperature compressor, the lower the up-conversion rate, and the higher the down-conversion rate, the lower the discharge pressure of the low-temperature compressor, the higher the up-conversion rate, and the lower the down-conversion rate.
The starting control method of the cascade refrigeration system based on the storage box can reasonably adjust the working frequency of the high-temperature compressor and the working frequency of the low-temperature compressor, control the rotating speed of the high-temperature compressor and the rotating speed of the low-temperature compressor and achieve normal refrigeration and rapid temperature rise of the compartment.
Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic diagram of a cascade refrigeration system.
Fig. 2 is a flowchart illustrating a control method of the cascade refrigeration system according to an embodiment of the present application.
In fig. 1, the respective reference numerals denote:
a1, a high-temperature compressor;
AC. An anti-condensation pipe;
C. a condenser;
d1, a first filter;
j1, a first capillary;
GL, gas-liquid separator;
EC. An evaporative condenser;
a2, a low-temperature compressor;
o, an oil separator;
d2, a second filter;
j2, a second capillary;
E. an evaporator;
1. an oil return line.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. 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 application.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it should be understood that the terms "first", "second", etc. are used to define the components, and are used only for the convenience of distinguishing the corresponding components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present application.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
In the embodiment of the present application, the compartment is a storage space of the storage box, and is also a refrigerating space of the cascade refrigerating system.
The embodiment of the application provides a starting control method of a cascade refrigeration system of a preservation box, which comprises the following steps:
step S10, the storage box is powered on, and a high-temperature compressor A1 of the cascade refrigeration system is started at a first set frequency RH 0;
step S11, determining the target time for the operation of the high-temperature compressor A1 to achieve the starting condition of the low-temperature compressor A2;
s12, determining target frequency of full-load operation of a high-temperature compressor A1 and a low-temperature compressor A2 of the cascade refrigeration system;
s13, determining a frequency raising and reducing mode, and controlling the frequency raising and reducing of the high-temperature compressor A1 to the target frequency;
step S14, the running time of the high-temperature compressor A1 reaches the target time, and the low-temperature compressor A2 is started at a second set frequency RL 0;
s15, determining a frequency increasing and decreasing mode, and controlling the frequency increasing and decreasing of the low-temperature compressor A2 to the target frequency;
in step S16, the compartment actual temperature Td reaches the compartment set temperature Ts.
The starting control method of the cascade refrigeration system based on the storage box can reasonably adjust the working frequency of the high-temperature compressor A1 and the working frequency of the low-temperature compressor A2, control the rotating speed of the high-temperature compressor A1 and the rotating speed of the low-temperature compressor A2, and achieve normal refrigeration and rapid temperature rise of a compartment.
In the start-up control method of some embodiments,
in step S10, according to the actual compartment temperature Td and the set compartment temperature Ts of the compartment of the storage box, the high-temperature compressor A1 of the cascade refrigeration system is started at the first set frequency RH 0; and/or
In step S11, determining a target time for the operation of the high temperature compressor A1 to achieve a starting condition of the low temperature compressor A2 according to the ambient temperature Ta and the compartment actual temperature Td; and/or
In the step S12, according to the ambient temperature Ta and the compartment set temperature Ts, the target frequency of full-load operation of the high-temperature compressor A1 and the low-temperature compressor A2 of the cascade refrigeration system is determined; and/or
In the step S13, a frequency raising and reducing mode is determined according to the suction pressure, the discharge pressure or the suction and discharge pressure difference of the high-temperature compressor A1, and the frequency raising and reducing of the high-temperature compressor A1 is controlled to reach the target frequency; and/or
In step S15, a frequency up-down mode is determined according to the suction pressure, the discharge pressure, or the suction-discharge pressure difference of the low-temperature compressor A2, and the low-temperature compressor A2 is controlled to increase the frequency up-down to its target frequency.
In some embodiments of the start-up control method, in step S10, after the power-on of the storage box for a first period of time, the actual compartment temperature Td is detected, and if the actual compartment temperature Td is higher than the set compartment temperature Ts by a predetermined temperature value Δ T, i.e., td is greater than or equal to Ts + Δt, the high-temperature compressor A1 is started at the first set frequency RH 0.
In the start-up control method of some embodiments,
the first time period is 3-15 min; and/or
The predetermined temperature value Δ T is 3 ℃.
In the start-up control method of some embodiments, in step S11, the target time for the operation of the high temperature compressor A1 is determined according to the temperature range in which the ambient temperature Ta is located and the temperature range in which the compartment actual temperature Td is located.
In the start-up control method of some embodiments, the lower the ambient temperature Ta and the compartment actual temperature Td, the shorter the target time for the high-temperature compressor A1 to operate, and the higher the ambient temperature Ta and the compartment actual temperature Td, the longer the target time for the high-temperature compressor A1 to operate.
In the start-up control method of some embodiments, in step S12, the target frequencies of the full-load operation of the high-temperature compressor A1 and the low-temperature compressor A2 are determined in accordance with the temperature range in which the ambient temperature Ta is located and the temperature range in which the compartment set temperature Ts is located.
In the start-up control method of some embodiments, the lower the ambient temperature Ta and the higher the compartment set temperature Ts, the lower the target frequency at the time of full-load operation of the high-temperature compressor A1 and the low-temperature compressor A2, the higher the ambient temperature Ta and the lower the compartment set temperature Ts, and the higher the target frequency at the time of full-load operation of the high-temperature compressor A1 and the low-temperature compressor A2.
In the start-up control method of some embodiments, in step S13,
determining the lifting frequency of the high-temperature compressor A1 according to the pressure range of the exhaust pressure of the high-temperature compressor A1; and/or
And adjusting the lifting frequency of the high-temperature compressor A1 by detecting the exhaust pressure of the high-temperature compressor A1 in real time.
In the start-up control method of some embodiments, the higher the discharge pressure of the high-temperature compressor A1, the lower the frequency-up rate, and the higher the frequency-down rate, the lower the discharge pressure of the high-temperature compressor A1, the higher the frequency-up rate, and the lower the frequency-down rate.
In the start-up control method of some embodiments,
the first set frequency RH0 is 30-40 Hz; and/or
The second set frequency RL0 is 25-35 Hz.
In the startup control method of some embodiments, in step S15,
determining the lifting frequency of the low-temperature compressor A2 according to the pressure range of the exhaust pressure of the low-temperature compressor A2; and/or
And adjusting the lifting frequency of the low-temperature compressor A2 by detecting the exhaust pressure of the low-temperature compressor A2 in real time.
In the start-up control method of some embodiments, the higher the discharge pressure of the low temperature compressor A2, the lower the up-conversion rate, and the higher the down-conversion rate, the lower the discharge pressure of the low temperature compressor A2, the higher the up-conversion rate, and the lower the down-conversion rate.
Embodiments of the present disclosure are described in more detail below with reference to fig. 1-2.
FIG. 1 is a schematic diagram of a cascade refrigeration system. As shown in fig. 1, the cascade refrigeration system is used for a holding tank, and includes two parts, a high temperature stage and a low temperature stage. The high-temperature stage refrigerant flow path is sequentially provided with a high-temperature compressor A1, an anti-condensation pipe AC, a condenser C, a first filter D1, a first capillary tube J1 and a gas-liquid separator GL. The condensation-preventing pipe AC is packaged at the door seal of the storage box, and has the functions of heating the door seal and reducing frosting. The gas-liquid separator stores the liquid refrigerant at the outlet of the evaporator, so that wet compression is avoided, liquid impact on the compressor is avoided, and the service life of the compressor is shortened. The low-temperature-stage refrigerant flow path is sequentially provided with a low-temperature compressor A2, an oil separator O, a second filter D2, a second capillary tube J2 and an evaporator E, the exhaust gas of the low-temperature compressor A2 is pre-cooled by a condenser C and then flows through the oil separator O, and the lubricating oil accumulated in the oil separator O flows back to the low-temperature compressor A2 through an oil return line 1. An oil return pipeline 1 is arranged between the low-temperature compressor A2 and the oil separator O. The heat exchange between the high-temperature stage and the low-temperature stage is performed by the evaporative condenser EC. The second capillary J2 is formed by connecting two sections of capillaries with different inner diameters in series, the refrigerant inlet is a small pipe diameter, the refrigerant outlet is a large pipe diameter so as to reduce the probability of oil blockage of lubricating oil in the throttling process of the capillary, and the inner diameter and the length of the pipe diameter are determined by the throttling temperature. Pressure sensors are respectively arranged on air outlet pipelines of the high-temperature compressor A1 and the low-temperature compressor A2, and the exhaust pressure of the high-temperature compressor A1 and the exhaust pressure of the low-temperature compressor A2 are detected in real time through the pressure sensors.
In the cascade refrigeration system, the high-temperature compressor A1 firstly operates at an increased frequency for a period of time, and then the low-temperature compressor A2 is started and increased frequency is carried out to heat the storage box. For this reason, it is necessary to control the operating frequencies of the high-temperature compressor A1 and the low-temperature compressor A2 and the start timing of the low-temperature compressor A2.
Fig. 2 is a flowchart illustrating a control method of the cascade refrigeration system according to an embodiment of the present application. Referring to fig. 2, the start control method of the present embodiment mainly includes the following steps S10 to S16.
Step S10: the storage box is powered on, and the high-temperature compressor A1 is started at a first set frequency RH0 according to the actual compartment temperature Td and the set compartment temperature Ts.
In this embodiment, after the storage box is powered on for the first time period, the actual temperature Td of the compartment is detected to provide an initial starting condition for the automatic starting of the high temperature compressor A1. If the actual compartment temperature Td is higher than the set compartment temperature Ts by a predetermined temperature value DeltaT, i.e., td is greater than or equal to Ts + DeltaT, the high temperature compressor A1 is started at the first set frequency RH 0. In this example, RH0=33Hz. The first time period is 3min and the predetermined temperature value DeltaT is 3 ℃.
Step S11: the target time for the operation of the high temperature compressor A1 is determined according to the ambient temperature Ta and the compartment actual temperature Td.
The high temperature compressor A1 is operated, and in order to determine the start timing of the low temperature compressor A2, a target time for the high temperature compressor A1 to be operated is determined according to a temperature range in which the ambient temperature Ta is located and a temperature range in which the compartment actual temperature Td is located. Under the conditions of a lower ambient temperature Ta and an actual compartment temperature Td, the conditions required for starting the low-temperature compressor A2 can be achieved by operating the high-temperature compressor A1 for a short time. On the contrary, the ambient temperature Ta and the compartment actual temperature Td are high, and the high temperature compressor A1 must be operated for a long time to satisfy the starting condition of the low temperature compressor A2. The ambient temperature Ta and the compartment actual temperature Td are divided into sections, wherein the target time for the high-temperature compressor A1 to operate in each of the divided sections is shown in the following table:
step S12: and determining the target frequency of the full-load operation of the high-temperature compressor A1 and the low-temperature compressor A2 according to the ambient temperature Ta and the compartment set temperature Ts.
The high-temperature compressor A1 is started at a first set frequency RH0 and is gradually increased in frequency, and because the cold quantity required by the compartment is closely related to the ambient temperature Ta and the compartment set temperature Ts, when the high-temperature compressor A1 and the low-temperature compressor A2 run at full load, the target frequencies FHq and FLq of different partition areas can be different. In the case of a lower ambient temperature Ta and a higher compartment set temperature Ts, the target frequency at which the high-temperature compressor A1 and the low-temperature compressor A2 operate at full load will be lower. Conversely, when the ambient temperature Ta is high and the compartment set temperature Ts is low, the target frequency at the time of full load operation of the high temperature compressor A1 and the low temperature compressor A2 is high. The target frequencies of the full-load operation of the high-temperature compressor A1 and the low-temperature compressor A2 are shown in the following table:
step S13: and determining a frequency raising and reducing mode according to the exhaust pressure of the high-temperature compressor A1, and controlling the frequency raising and reducing of the high-temperature compressor A1 to a target frequency.
In order to avoid overhigh exhaust pressure of the compressor and realize quick temperature rise, the lifting frequency of the compressor is set according to the exhaust pressure, and the lifting frequency of the high-temperature compressor A1 is adjusted by detecting the exhaust pressure of the high-temperature compressor A1 in real time. Wherein, if the pressure is higher, the frequency increasing rate is decreased, and the frequency decreasing rate is increased. Conversely, a lower pressure increases the up rate and decreases the down rate. The current operating frequency of the high temperature compressor A1 is decreased when it is higher than the target frequency of the full load operation of the high temperature compressor A1, and is increased when the current operating frequency of the high temperature compressor A1 is lower (not higher) than the target frequency of the full load operation of the high temperature compressor A1. The lifting frequency rule of the high-temperature compressor A1 is as follows:
| exhaust pressure Ph (bar) | 20＜Ph≤30 | 10＜Ph≤20 | Ph≤10 |
| Rate of rise Hz/s | RH1 | RH2 | RH3 |
| Down-conversion rate Hzs | RH4 | RH5 | RH6 |
Step S14: the running time of the high-temperature compressor A1 reaches the target time, and the low-temperature compressor A2 is started at a second set frequency.
The start of the low temperature compressor A2 is determined by the operating time of the high temperature compressor A1 reaching the target time. The running time of the high temperature compressor A1 reaches the target time, indicating that the surface temperature of the intermediate heat exchanger has decreased, reaching the starting condition of the low temperature compressor A2. At this time, the low temperature compressor A2 is started at the second set frequency RL 0. In this example, RL0=33Hz.
Step S15: and determining a frequency raising and reducing mode according to the exhaust pressure of the low-temperature compressor A2, and controlling the frequency raising and reducing of the low-temperature compressor A2 to a target frequency.
The low-temperature compressor A2 is started, the temperature of the storage box starts to be raised, in order to match the refrigerating capacity and avoid the exhaust pressure from exceeding the running working condition of the compressor, the lifting frequency of the low-temperature compressor A2 is set according to the exhaust pressure, and the lifting frequency of the compressor is adjusted by detecting the exhaust pressure of the low-temperature compressor A2 in real time. Wherein, if the pressure is higher, the frequency increasing rate is decreased, and the frequency decreasing rate is increased. Conversely, a lower pressure increases the up rate and decreases the down rate. The current operating frequency of the cryogenic compressor A2 is down-converted when it is higher than the target frequency of the full load operation of the cryogenic compressor A2, and the current operating frequency of the cryogenic compressor A2 is up-converted when it is lower (not higher) than the target frequency of the full load operation of the cryogenic compressor A2. The regulation of the lifting frequency of the low-temperature compressor A2 is as follows:
| exhaust pressure P L (bar) | 20＜P L ≤30 | 10＜P L ≤20 | P L ≤10 |
| Rate of rise Hz/s | RL1 | RL2 | RL3 |
| Frequency reduction rate Hz/s | RL4 | RL5 | RL6 |
Step S16: the compartment actual temperature Td reaches the compartment set temperature Ts.
The high-temperature compressor A1 and the low-temperature compressor A2 operate at a target frequency, the evaporator continuously absorbs compartment heat and transmits the compartment heat to the condenser C through the intermediate heat exchanger, compartment cooling is achieved, when the actual compartment temperature Td reaches the set compartment temperature Ts, the temperature pulling stage is finished, stable operation is started, and the start-stop state is started.
According to the starting control method provided by the embodiment of the application, on the premise that the high-temperature compressor A1 and the low-temperature compressor A2 are reliably started, the working frequencies of the high-temperature compressor A1 and the low-temperature compressor A2 are reasonably adjusted according to the ambient temperature Ta, the actual temperature Td of the compartment before the high-temperature compressor A1 is started and the set temperature Ts of the compartment, the rotating speeds of the high-temperature compressor A1 and the low-temperature compressor A2 are controlled, and normal refrigeration and rapid temperature rise of the compartment are realized.
In order to realize reliable starting and quick temperature rise of the high-temperature compressor A1 and the low-temperature compressor A2, the operation target time of the high-temperature compressor A1 and the target frequency of the high-temperature compressor A1 and the low-temperature compressor A2 are determined according to the ambient temperature Ta, the actual temperature Td of a front chamber of the high-temperature compressor A1 and the set temperature Ts of a chamber in a box, the lifting frequency mode is determined according to the exhaust pressure of the high-temperature compressor A1 and the low-temperature compressor A2, the lifting frequency of the high-temperature compressor A1 and the low-temperature compressor A2 is controlled, the frequency conversion stage of the high-temperature compressor A1 and the low-temperature compressor A2 is subdivided, the high-temperature compressor A1 and the low-temperature compressor A2 are suitable for the starting environment of multiple working conditions, the frequency modulation of the compressor is reasonable, the quick temperature rise and the energy conservation are realized.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solutions of the present application and not to limit them; although the present application has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will understand that: modifications to the embodiments of the present application or equivalent replacements of some technical features may still be made, which shall be covered by the scope of the technical solution claimed in the present application.
Claims (13)
1. A method for controlling the start-up of a cascade refrigeration system of a holding tank, comprising:
step S10, the storage box is powered on, and a high-temperature compressor (A1) of the cascade refrigeration system is started at a first set frequency RH 0;
step S11, determining the target time for the operation of the high-temperature compressor (A1) to reach the starting condition of the low-temperature compressor (A2);
step S12, determining target frequencies of full-load operation of the high-temperature compressor (A1) and the low-temperature compressor (A2) of the cascade refrigeration system;
s13, determining a frequency increasing and decreasing mode, and controlling the frequency increasing and decreasing of the high-temperature compressor (A1) to the target frequency;
step S14, the running time of the high-temperature compressor (A1) reaches the target time, and the low-temperature compressor (A2) is started at a second set frequency RL 0;
step S15, determining a frequency raising and reducing mode, and controlling the low-temperature compressor (A2) to raise and lower the frequency to the target frequency;
and S16, enabling the compartment actual temperature Td to reach the compartment set temperature Ts.
2. The startup control method according to claim 1,
in the step S10, the high-temperature compressor (A1) of the cascade refrigeration system is started at a first set frequency RH0 according to the actual compartment temperature Td and the set compartment temperature Ts of the compartment of the storage box; and/or
In the step S11, a target time for operating the high-temperature compressor (A1) is determined according to an ambient temperature Ta and the actual compartment temperature Td so as to achieve a starting condition of the low-temperature compressor (A2); and/or
In the step S12, determining a target frequency of a full load operation of the high-temperature compressor (A1) and the low-temperature compressor (A2) of the cascade refrigeration system according to the ambient temperature Ta and the compartment set temperature Ts; and/or
In the step S13, a frequency up-down mode is determined according to the suction pressure, the discharge pressure, or the suction-discharge pressure difference of the high-temperature compressor (A1), and the frequency up-down of the high-temperature compressor (A1) is controlled to the target frequency; and/or
In the step S15, a frequency up-down mode is determined according to the suction pressure, the discharge pressure, or the suction-discharge pressure difference of the low-temperature compressor (A2), and the low-temperature compressor (A2) is controlled to be frequency up-down to the target frequency.
3. The start-up control method as claimed in claim 2, wherein in step S10, after the power-on of the storage box for a first time period, the actual compartment temperature Td is detected, and if the actual compartment temperature Td is higher than the set compartment temperature Ts by a predetermined temperature value Δ T, that is, td ≧ Ts + Δt, the high-temperature compressor (A1) is started at the first set frequency RH 0.
4. The startup control method according to claim 3,
the first time period is 3-15 min; and/or
The predetermined temperature value Δ T is 3 ℃.
5. The start-up control method as set forth in claim 2, wherein in said step S11, a target time for operating the high temperature compressor (A1) is determined depending on a temperature range in which the ambient temperature Ta is located and a temperature range in which the compartment actual temperature Td is located.
6. The start-up control method according to claim 5, characterized in that the lower the ambient temperature Ta and the compartment actual temperature Td, the shorter the target time for which the high-temperature compressor (A1) is operated, and the higher the ambient temperature Ta and the compartment actual temperature Td, the longer the target time for which the high-temperature compressor (A1) is operated.
7. The start-up control method according to claim 2, characterized in that in step S12, the target frequencies of full-load operation of the high-temperature compressor (A1) and the low-temperature compressor (A2) are determined in accordance with the temperature range in which the ambient temperature Ta is located and the temperature range in which the compartment set temperature Ts is located.
8. The start-up control method according to claim 7, characterized in that the lower the ambient temperature Ta and the higher the compartment set temperature Ts, the lower the target frequency at full operation of the high-temperature compressor (A1) and the low-temperature compressor (A2), and the higher the ambient temperature Ta and the lower the compartment set temperature Ts, the higher the target frequency at full operation of the high-temperature compressor (A1) and the low-temperature compressor (A2).
9. The startup control method according to claim 2, characterized in that, in step S13,
determining the lifting frequency of the high-temperature compressor (A1) according to the pressure range of the discharge pressure of the high-temperature compressor (A1); and/or
And adjusting the lifting frequency of the high-temperature compressor (A1) by detecting the exhaust pressure of the high-temperature compressor (A1) in real time.
10. The start-up control method as set forth in claim 9, wherein the higher the discharge pressure of said high temperature compressor (A1), the lower the up-conversion rate and the higher the down-conversion rate, and the lower the discharge pressure of said high temperature compressor (A1), the higher the up-conversion rate and the lower the down-conversion rate.
11. The startup control method according to claim 1,
the first set frequency RH0 is 30-40 Hz; and/or
The second set frequency RL0 is 25-35 Hz.
12. The startup control method according to claim 2, characterized in that, in said step S15,
determining the lifting frequency of the low-temperature compressor (A2) according to the pressure range of the discharge pressure of the low-temperature compressor (A2); and/or
Adjusting the lifting frequency of the low-temperature compressor (A2) by detecting the discharge pressure of the low-temperature compressor (A2) in real time.
13. The start-up control method as set forth in claim 12, wherein the higher the discharge pressure of the cryogenic compressor (A2), the lower the up-conversion rate, and the higher the down-conversion rate, and the lower the discharge pressure of the cryogenic compressor (A2), the higher the up-conversion rate, and the lower the down-conversion rate.
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| CN202310122905.5A CN115962592A (en) | 2023-02-16 | 2023-02-16 | Start control method for cascade refrigeration system of storage box |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117404870A (en) * | 2023-12-13 | 2024-01-16 | 珠海格力电器股份有限公司 | Refrigerator control method and device, electronic equipment and storage medium |
| CN117433194A (en) * | 2023-12-20 | 2024-01-23 | 珠海格力电器股份有限公司 | Control method and device of refrigeration system, refrigeration system and storage medium |
| CN117469871A (en) * | 2023-12-26 | 2024-01-30 | 珠海格力电器股份有限公司 | Control method and device of refrigeration system, refrigeration system and storage medium |
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2023
- 2023-02-16 CN CN202310122905.5A patent/CN115962592A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117404870A (en) * | 2023-12-13 | 2024-01-16 | 珠海格力电器股份有限公司 | Refrigerator control method and device, electronic equipment and storage medium |
| CN117433194A (en) * | 2023-12-20 | 2024-01-23 | 珠海格力电器股份有限公司 | Control method and device of refrigeration system, refrigeration system and storage medium |
| CN117433194B (en) * | 2023-12-20 | 2024-04-05 | 珠海格力电器股份有限公司 | Control method and device of refrigeration system, refrigeration system and storage medium |
| CN117469871A (en) * | 2023-12-26 | 2024-01-30 | 珠海格力电器股份有限公司 | Control method and device of refrigeration system, refrigeration system and storage medium |
| CN117469871B (en) * | 2023-12-26 | 2024-04-05 | 珠海格力电器股份有限公司 | Control method and device of refrigeration system, refrigeration system and storage medium |
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