Refrigeration control method of refrigeration equipment and refrigeration equipment

Abstract

The invention particularly relates to a refrigeration control method of refrigeration equipment and the refrigeration equipment. The refrigeration control method of the refrigeration equipment comprises the steps that the set temperature Ta of a refrigeration chamber of the refrigeration equipment, the actual temperature T1 of a refrigeration area in the refrigeration chamber and the actual temperature T2 of a preservation area in the refrigeration chamber are obtained, and whether Ta is larger than or equal to T1, and Ta is larger than or equal to T2 or not is judged; when Ta, T1 and T2 satisfy Ta > = T1 > = T2 or Ta > = T2 > = T1, setting the refrigeration cold supply loop to be disconnected; when Ta, T1 and T2 meet the condition that T1 is larger than Ta and smaller than or equal to T2 or T2 is larger than Ta and smaller than or equal to T1, the refrigeration and cold supply loop is communicated, and the opening degree K of the throttling valve is determined according to the formula T1-T2; and when Ta, T1 and T2 meet the condition that Ta is larger than or equal to T1 and smaller than T2 or Ta is larger than or equal to T1 and smaller than T2, whether the refrigeration and cold supply loop is communicated or not is determined according to the numerical value of the vertical line T1-T2, and the opening degree K of the throttling valve is determined according to the vertical line T1-T2. The temperature in the fresh-keeping area is controlled by additionally arranging the throttling valve, and the fresh-keeping device has the advantages of being low in cost, easy to implement, convenient to control and good in fresh-keeping effect.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, in particular to a refrigeration control method and refrigeration equipment. Background Art

[0002] At present, dual-system refrigerators are quite popular. When using refrigerators, a separate fresh-keeping area is often set up in the refrigerator compartment. The fresh-keeping effect of this area is usually better than that outside the area. The method of achieving the fresh-keeping effect in the fresh-keeping area is generally to control humidity and oxygen content.

[0003] Generally, one way manufacturers control the fresh-keeping area to maintain freshness is to increase the sealing of the structure and control the humidity and temperature stability of the fresh-keeping area. If only the sealing of the fresh-keeping area is enhanced, the fresh-keeping performance is more dependent on the temperature and humidity of the entire refrigerator, which is relatively passive. When the user sets the refrigeration area to a higher gear, the overall temperature of the refrigeration area will rise, and the fresh-keeping effect will decrease. If the temperature of the fresh-keeping area fluctuates greatly, it may cause the moisture content in the food to decrease, and in severe cases, it may cause water droplets or frost to form on the surface of the food, accelerating the decay of the food.

[0004] Another way to control the fresh-keeping area to maintain freshness is to add a vacuum pump to the fresh-keeping area, which reduces the oxygen concentration in the fresh-keeping area to slow down the oxidation rate of food, thereby enhancing the fresh-keeping performance. Although the solution of setting up a vacuum pump for the fresh-keeping area can improve the fresh-keeping effect, it cannot control the temperature in the fresh-keeping area, and the vacuum pump is noisy, which affects the user experience.

[0005] Therefore, it is necessary to study a refrigeration control method of a refrigeration device and a refrigeration device to solve the above problems. Summary of the invention

[0006] The present invention aims to provide a refrigeration control method for a refrigeration device which is easy to implement and control.

[0007] In order to achieve the above objectives, an embodiment of the present invention provides a refrigeration control method for a refrigeration device, comprising:

[0008] Obtain the set temperature Ta of the cold storage room of the refrigeration equipment, the actual temperature T1 of the cold storage area in the cold storage room, and the actual temperature T2 of the fresh-keeping area in the cold storage room, and determine whether Ta, T1, and T2 satisfy Ta≥T1 and Ta≥T2;

[0009] When Ta, T1, and T2 satisfy Ta≥T1≥T2 or Ta≥T2≥T1, the refrigeration cooling circuit set to provide cooling for the refrigerated compartment is disconnected;

[0010] When Ta, T1, and T2 satisfy Ta < T1 ≤ T2 or Ta < T2 ≤ T1, connect the refrigerated cooling circuit, and determine the opening degree K of the throttle valve of the refrigerated cooling circuit according to the absolute value 丨T1 - T2丨 of the temperature difference between the refrigerated area and the fresh-keeping area. The refrigerated cooling circuit includes a compressor, a condenser, a refrigerated capillary tube, a throttle valve, and a refrigerated evaporator;

[0011] When Ta, T1, and T2 satisfy T1 ≤ Ta < T2 or T1 ≤ Ta < T2, determine whether to connect the refrigerated cooling circuit according to the value of 丨T1 - T2丨, and determine the opening degree K of the throttle valve according to 丨T1 - T2丨.

[0012] As a further improvement of an embodiment of the present invention, when Ta, T1, and T2 satisfy Ta < T1 ≤ T2 or Ta < T2 ≤ T1, obtain the value of 丨T1 - T2丨, and determine whether 丨T1 - T2丨 satisfies 丨T1 - T2丨 ≤ T 预设1 , T 预设1 is defined as the preset lower limit value of the temperature difference between the refrigerated area and the fresh-keeping area;

[0013] When 丨T1 - T2丨 satisfies 丨T1 - T2丨 ≤ T 预设1 , set K to be negatively correlated with the value of 丨T1 - T2丨;

[0014] When 丨T1 - T2丨 satisfies 丨T1 - T2丨 > T 预设1 , set K to be positively correlated with the value of 丨T1 - T2丨, where the maximum value of K is 100%.

[0015] As a further improvement of an embodiment of the present invention, when 丨T1 - T2丨 satisfies 丨T1 - T2丨 ≤ T 预设1 , set K = K 初始 - Δ K , where K 初始 is defined as the initial preset value of the throttle valve, and Δ K is positively correlated with the value of 丨T1 - T2丨;

[0016] When 丨T1 - T2丨 satisfies 丨T1 - T2丨 > T 预设1 , set K = K 初始 + Δ K .

[0017] As a further improvement of an embodiment of the present invention, when Ta, T1, and T2 satisfy T1 ≤ Ta < T2 or T1 ≤ Ta < T2, obtain the value of 丨T1 - T2丨, and determine whether 丨T1 - T2丨 satisfies 丨T1 - T2丨 ≤ T 预设1 , T 预设1 is defined as the preset lower limit value of the temperature difference between the refrigerated area and the fresh-keeping area;

[0018] When |T1 - T2| satisfies |T1 - T2| ≤ T 预设1 the refrigeration cooling circuit is set to be disconnected;

[0019] When |T1 - T2| satisfies |T1 - T2| > T 预设1 the refrigeration cooling circuit is connected, and it is set that K is positively correlated with the value of |T1 - T2|, where the maximum value of K is 100%.

[0020] As a further improvement of an embodiment of the present invention, when |T1 - T2| satisfies |T1 - T2| > T 预设1 it is set that K = K 初始 + Δ K where Δ K is positively correlated with the value of |T1 - T2|.

[0021] As a further improvement of an embodiment of the present invention, the aforementioned Δ K = λ|T1 - T2|, where λ is defined as the median value of the percentage by which the pressure value corresponding to the refrigerant decreases when the temperature of the refrigerant flowing in the refrigeration cooling circuit decreases by 1°C.

[0022] As a further improvement of an embodiment of the present invention, the refrigerant flowing in the refrigeration cooling circuit is R600a and λ is 5%.

[0023] As a further improvement of an embodiment of the present invention, T 预设1 is 0.5°C and K 初始 is 50%.

[0024] To solve the above problems, the present invention also provides a refrigeration device with low cost, easy to implement, convenient to control, and good fresh-keeping effect.

[0025] A refrigeration device includes a control unit, and the control unit includes a memory and a processor. The memory stores a computer program that can run on the processor, and when the processor executes the computer program, it implements the refrigeration control method of the refrigeration device as described above.

[0026] As a further improvement of an embodiment of the present invention, the refrigeration device includes a box body and a refrigeration system arranged in the box body. The box body defines a refrigerated compartment and a frozen compartment. The refrigeration system includes a refrigeration cooling circuit formed by a compressor, a condenser, a freezing capillary tube, and a freezing evaporator connected through pipelines,

[0027] the refrigeration system further includes a refrigeration cooling branch connected in parallel with the freezing capillary tube. The refrigeration cooling branch includes a refrigeration capillary tube, a throttle valve, and a refrigeration evaporator connected in series through pipelines. When the refrigeration cooling branch is connected between the condenser and the freezing evaporator, the aforementioned refrigeration cooling circuit is connected;

[0028] The freezing evaporator is used to provide cooling for the freezing compartment; the refrigerating evaporator is used to provide cooling for the refrigerating compartment;

[0029] The refrigerated compartment includes a refrigerated area and a fresh-keeping area other than the refrigerated area.

[0030] As a further improvement of an embodiment of the present invention, the refrigeration system further includes a three-way solenoid valve connected to the outlet pipeline of the condenser, the three-way solenoid valve having one inlet and two outlets;

[0031] Wherein, the inlet of the three-way solenoid valve is connected to the pipeline at the outlet end of the condenser;

[0032] One outlet of the three-way solenoid valve is connected to a freezing capillary;

[0033] The other outlet of the three-way solenoid valve is connected to the refrigeration cooling branch.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows: the refrigeration control method and refrigeration equipment provided by the present invention preliminarily determine whether the cold storage room needs refrigeration according to the size relationship between Ta, T, and T, and then determine whether to connect the cold storage cold supply circuit to supply cold to the cold storage room according to the absolute value of the temperature difference between the cold storage area and the fresh-keeping area |T1-T2|, accurately control the connection of the cold storage cold supply circuit to achieve energy-saving effects, and determine the opening K of the throttle valve of the cold storage cold supply circuit according to |T1-T2|, so that the evaporation temperature of the cold storage evaporator is increased or decreased. By adjusting the cold storage evaporation temperature, the temperature fluctuation of the fresh-keeping area during the refrigeration process can be reduced. The temperature of the fresh-keeping area is kept stable as soon as possible. By adding a throttle valve and increasing the control logic with the throttle valve, the fresh-keeping effect of the cold storage room can be improved, and the temperature in the fresh-keeping area can be controlled, which has the advantages of reducing costs, being easy to implement, being easy to control, and having good fresh-keeping effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structural composition of the refrigeration system of the refrigeration equipment of the present invention;

[0036] Figure 2 It is a flow chart of the refrigeration control method of the refrigeration equipment of the present invention when Ta≥T1≥T2 or Ta≥T2≥T1;

[0037] Figure 3 It is a flow chart of the refrigeration control method of the refrigeration equipment of the present invention when Ta<T1≤T2 or Ta<T2≤T1;

[0038] Figure 4 It is a flow chart of the refrigeration control method of the refrigeration equipment of the present invention when T1≤Ta<T2 or T1≤Ta<T2.

[0039] In the figure: 11, compressor; 12, condenser; 13, refrigerating capillary tube; 14, throttle valve; 15, refrigerating evaporator; 16, freezing capillary tube; 17, freezing evaporator; 18, three-way solenoid valve. Specific embodiments

[0040] The following elaborates on the preferred embodiments of the present invention in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making the scope of protection of the present invention more clearly defined.

[0041] The terms "comprising" and "having" and any variations thereof in the present invention are intended to cover non-exclusive inclusion. The mention of "embodiment" in this article means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0042] Combined with Figures 1 to 4 As shown, the present invention mainly relates to: a refrigeration control method for a refrigeration device, including:

[0043] Obtain the set temperature Ta of the refrigerating compartment of the refrigeration device, the actual temperature T1 of the refrigerating area in the refrigerating compartment, and the actual temperature T2 of the fresh-keeping area in the refrigerating compartment, and determine whether Ta, T1, and T2 satisfy Ta≥T1 and Ta≥T2;

[0044] Referring to Figure 2 As shown, when Ta, T1, and T2 satisfy Ta≥T1≥T2 or Ta≥T2≥T1, disconnect the refrigerating supply circuit that provides cold for the refrigerating compartment.

[0045] Referring to Figure 3 As shown, when Ta, T1, and T2 satisfy Ta<T1≤T2 or Ta<T2≤T1, connect the refrigerating supply circuit, and determine the opening degree K of the throttle valve of the refrigerating supply circuit according to the absolute value |T1 - T2| of the temperature difference between the refrigerating area and the fresh-keeping area, where the refrigerating supply circuit includes a compressor, a condenser, a refrigerating capillary tube, a throttle valve, and a refrigerating evaporator.

[0046] Referring to Figure 4 As shown, when Ta, T1, and T2 satisfy T1≤Ta<T2 or T1≤Ta<T2, determine whether to connect the refrigerating supply circuit according to the value of |T1 - T2|, and determine the opening degree K of the throttle valve according to |T1 - T2|.

[0047] Specifically, the refrigeration device includes a box body, a refrigeration system arranged in the box body, and a refrigeration compartment is defined in the box body. The refrigeration compartment includes a refrigeration area and a fresh-keeping area. In this embodiment, the fresh-keeping area is the area of ​​the refrigeration compartment other than the refrigeration area. The refrigeration device includes a first temperature sensor arranged in the refrigeration area for obtaining an actual temperature T1 of the refrigeration area, and a second temperature sensor arranged in the fresh-keeping area for obtaining an actual temperature T2 of the fresh-keeping area.

[0048] It is understandable that other storage compartments may be defined in the box, including a freezing compartment and / or a temperature-changing compartment.

[0049] Reference Figure 1 As shown, the refrigeration system includes a compressor 11, a condenser 12, a refrigeration capillary 13, a throttle valve 14, and a refrigeration evaporator 15 connected by pipelines. The compressor 11, the condenser 12, the refrigeration capillary 13, the throttle valve 14, and the refrigeration evaporator 15 are connected in sequence to form a refrigeration cooling circuit. The refrigeration evaporator 15 is used to provide cooling for the refrigeration compartment.

[0050] The refrigerant is compressed by the compressor 11 and enters the condenser 12, where it is condensed into a gas-liquid two-phase refrigerant. After exiting the condenser 12, the refrigerant enters the refrigeration capillary 13 and the throttle valve 14 for throttling, so that the temperature and pressure of the refrigerant are reduced to the required evaporation temperature, and then enters the refrigeration evaporator 15 for evaporation, and performs heat exchange with the load. The refrigerant at the outlet of the refrigeration evaporator is in a superheated gas state. At this time, the refrigerant in the superheated gas state eventually returns to the compressor 11, so as to achieve the purpose of cooling the refrigerated compartment.

[0051] When Ta≥T1≥T2 or Ta≥T2≥T1, that is, the actual temperature of the refrigerated area and the fresh-keeping area are lower than the set temperature of the refrigerated compartment, there is no need to provide cooling for the refrigerated compartment. The refrigerated cooling circuit is set to be disconnected to achieve energy saving.

[0052] When Ta<T1≤T2 or Ta<T2≤T1, that is, the set temperature of the refrigerated compartment is lower than the actual temperature of the refrigerated area and the fresh-keeping area. At this time, in order to make the refrigerated area or the fresh-keeping area reach the set temperature of the refrigerated compartment, the refrigerated cooling circuit needs to be connected, and the refrigerated evaporator 15 is used to provide cooling for the refrigerated compartment.

[0053] In order to ensure the temperature stability of the fresh-keeping area, the opening degree K of the throttle valve 14 of the refrigeration cooling circuit is determined according to the absolute value of the temperature difference between the refrigerated area and the fresh-keeping area |T1-T2|. Since the flow rate is inversely proportional to the pressure, the throttle valve 14 can change the pressure of the refrigerant in the refrigeration system by changing the flow rate of the medium.

[0054] When |T1 - T2| is small, it indicates that the temperature difference between the refrigerated area and the fresh-keeping area is small. When the opening degree K of the throttle valve 14 is reduced and the throttle valve 14 reduces the cross-sectional area of the pipeline, the resistance increases, the flow rate of the liquid or gas slows down, the flow rate becomes smaller, and the refrigerant pressure of the refrigeration system increases. The evaporation temperature of the refrigerated evaporator 15 increases; by adjusting the refrigerated evaporation temperature in this way, the temperature fluctuation in the fresh-keeping area during the refrigeration process can be reduced.

[0055] When |T1 - T2| is large, it indicates that the temperature difference between the refrigerated area and the fresh-keeping area is large. The opening degree K of the throttle valve 14 is increased, the cross-sectional area of the pipeline of the throttle valve 14 is enlarged, the refrigerant flow rate speeds up, the flow rate increases, and the refrigerant pressure of the system decreases. In order to quickly reduce the refrigerant temperature and pressure to the required evaporation temperature, the evaporation temperature of the refrigerated evaporator 15 decreases. To quickly ensure the temperature stability of the fresh-keeping area.

[0056] When T1 ≤ Ta < T2 or T1 ≤ Ta < T2, that is to say, the set temperature of the refrigerated compartment is between the actual temperature of the refrigerated area and the actual temperature of the fresh-keeping area. Determine whether to connect the refrigerated cooling circuit according to the value of |T1 - T2|, and determine the opening degree K of the throttle valve 14 according to |T1 - T2|.

[0057] When |T1 - T2| is small, at this time, there is no need to connect the refrigerated cooling circuit. The refrigerated area and the fresh-keeping area can reach the set temperature of the refrigerated compartment respectively through the heat transfer between the refrigerated area and the fresh-keeping area, avoiding the connection of the refrigerated cooling circuit, reducing the start-stop frequency of the compressor 11, and having the advantages of energy saving and high efficiency.

[0058] When |T1 - T2| is large, it indicates that the temperature difference between the refrigerated area and the fresh-keeping area is large. The opening degree K of the throttle valve 14 is increased, the cross-sectional area of the pipeline of the throttle valve 14 is enlarged, the flow rate speeds up, the flow rate increases, and the refrigerant pressure of the system decreases. In order to quickly reduce the refrigerant temperature and pressure to the required evaporation temperature, the evaporation temperature of the refrigerated evaporator 15 decreases, so as to quickly keep the temperature of the fresh-keeping area stable.

[0059] Refer to Figure 3 As shown, further, the refrigeration control method of the refrigeration equipment includes:

[0060] When Ta, T1, and T2 satisfy Ta < T1 ≤ T2 or Ta < T2 ≤ T1, obtain the value of |T1 - T2|, and judge whether |T1 - T2| satisfies |T1 - T2| ≤ T 预设1 T 预设1 is defined as the preset lower limit value of the temperature difference between the refrigerated area and the fresh-keeping area;

[0061] When |T1 - T2| satisfies |T1 - T2| ≤ T 预设1 Set K to be negatively correlated with the value of |T1 - T2|.

[0062] When |T1 - T2| satisfies |T1 - T2| > T 预设1 At this time, it is set that K is positively correlated with the value of |T1 - T2|, where the maximum value of K is 100%.

[0063] Specifically, in order to facilitate the standardized judgment of |T1 - T2|, T is set 预设1 . T 预设1 The value of T is set according to the requirements of the temperature stability of the fresh-keeping area. It has the advantages of being easy to judge and easy to implement.

[0064] When |T1 - T2| ≤ T 预设1 At this time, the range of |T1 - T2| is between 0 and T 预设1 The temperature difference between the refrigerating area and the fresh-keeping area is small. At this time, the method of reducing the opening degree K of the throttle valve 14 needs to be adopted, and the evaporation temperature of the refrigerating evaporator 15 increases. Therefore, the larger |T1 - T2| is, the smaller |T1 - T2| is.

[0065] |T1 - T2| > T 预设1 At this time, it means that the temperature difference between the refrigerating area and the fresh-keeping area is large. At this time, the method of increasing the opening degree K of the throttle valve 14 needs to be adopted, and the evaporation temperature of the refrigerating evaporator 15 decreases; therefore, the larger |T1 - T2| is, the larger |T1 - T2| is.

[0066] Refer to Figure 3 As shown in the figure, further, the refrigeration control method of the refrigeration equipment includes:

[0067] When |T1 - T2| satisfies |T1 - T2| ≤ T 预设1 At this time, it is set that K = K 初始 -Δ K , where K 初始 is defined as the initial preset value of the throttle valve 14, and Δ K is positively correlated with the value of |T1 - T2|;

[0068] When |T1 - T2| satisfies |T1 - T2| > T 预设1 At this time, it is set that K = K 初始 +Δ K .

[0069] Specifically, K 初始 is defined as the initial standard value of the throttle valve 14 set when the refrigeration equipment leaves the factory or is powered on for the first time. The initial standard value is set according to the requirement of satisfying the refrigeration and fresh-keeping of the refrigerated compartment in most cases.

[0070] Preferably, when Ta ≥ T1 ≥ T2 or Ta ≥ T2 ≥ T1, the opening degree K of the throttle valve 14 is set to K 初 beginning.

[0071] When |T1 - T2| ≤ T 预设1 at this time, set K to be K minus Δ 初始 on the basis of K to achieve the purpose of reducing the opening degree K of the throttle valve 14. The evaporation temperature of the refrigerated evaporator 15 increases; by adjusting the refrigerated evaporation temperature in this way, the temperature fluctuation in the fresh-keeping area during the refrigeration process can be reduced.

[0072] When |T1 - T2| > T 预设1 at this time, set K to be K plus Δ 初始 on the basis of K to achieve the purpose of increasing the opening degree K of the throttle valve 14. As soon as possible, make the refrigerant temperature and pressure drop to the required evaporation temperature, and the evaporation temperature of the refrigerated evaporator 15 decreases, so as to make the temperature in the fresh-keeping area stable as soon as possible.

[0073] Preferably, Δ K is directly proportional to the value of |T1 - T2|.

[0074] Furthermore, when |T1 - T2| > T 预设1 when |T1 - T2| reaches a value T 峰值 at this time, K reaches 100%, and when |T1 - T2| > T 峰值 at this time, K is also 100%.

[0075] Referring to Figure 4 as shown, furthermore, the refrigeration control method of the refrigeration equipment includes:

[0076] When Ta, T1, and T2 satisfy T1 ≤ Ta < T2 or T1 ≤ Ta < T2, obtain the value of |T1 - T2|, and judge whether |T1 - T2| satisfies |T1 - T2| ≤ T 预设1 , T 预设1 is defined as the preset lower limit value of the temperature difference between the refrigerated area and the fresh-keeping area;

[0077] When |T1 - T2| satisfies |T1 - T2| ≤ T 预设1 at this time, set the refrigerated cooling circuit to be disconnected;

[0078] When |T1 - T2| satisfies |T1 - T2| > T 预设1 at this time, connect the refrigerated cooling circuit, and set K to be positively correlated with the value of |T1 - T2|, where the maximum value of K is 100%.

[0079] Specifically, the set temperature of the refrigerated compartment is between the actual temperature of the refrigerated area and the actual temperature of the fresh-keeping area. When |T1 - T2| ≤ T 预设1When this occurs, there is no need to connect the refrigerated cooling circuit. By transferring the cooling capacity between the refrigerated area and the fresh-keeping area, the set temperatures of the refrigerated compartment can be reached in the refrigerated area and the fresh-keeping area respectively, avoiding connecting the refrigerated cooling circuit, reducing the start-stop frequency of the compressor 11, and having the advantages of energy saving and high efficiency.

[0080] When |T1 - T2| ≤ T 预设1 When the refrigerated cooling circuit is disconnected, the opening degree K of the throttle valve 14 is set to K 初始 .

[0081] When |T1 - T2| > T 预设1 It means that the temperature difference between the refrigerated area and the fresh-keeping area is relatively large. At this time, the method of increasing the opening degree K of the throttle valve 14 is needed, and the evaporation temperature of the refrigerated evaporator 15 decreases to make the temperature of the fresh-keeping area stable as soon as possible. Therefore, the larger |T1 - T2| is, the larger |T1 - T2| is.

[0082] Referring to Figure 4 As shown, further, the refrigeration control method of the refrigeration equipment includes:

[0083] When |T1 - T2| satisfies |T1 - T2| > T 预设1 Set K = K 初始 + Δ K , where Δ K Is positively correlated with the value of |T1 - T2|.

[0084] Specifically, when T1 ≤ Ta < T2 or T1 ≤ Ta < T2, and |T1 - T2| > T 预设1 Set K to be K 初始 On the basis of adding Δ K To achieve the purpose of increasing the opening degree K of the throttle valve 14. As soon as possible, the refrigerant temperature and pressure are reduced to the required evaporation temperature, and the evaporation temperature of the refrigerated evaporator 15 decreases to make the temperature of the fresh-keeping area stable as soon as possible.

[0085] Further, the refrigeration control method of the refrigeration equipment includes:

[0086] The aforementioned Δ K = λ|T1 - T2|, where λ is defined as the median value of the percentage by which the pressure value of the refrigerant decreases when the temperature of the refrigerant flowing in the refrigerated cooling circuit decreases by 1°C.

[0087] λ is defined as the value of the pressure reduction required for the refrigerant in the refrigerating supply circuit of the refrigeration equipment to decrease by 1°C, which is converted into a percentage reduction. By calculating λ|T1 - T2|, the total percentage of the pressure reduction required for the temperature difference corresponding to T1 - T2 can be calculated, and the pressure value required for the refrigerant temperature and pressure to decrease to the required evaporation temperature and for the evaporation temperature of the refrigerating evaporator 15 to decrease can be obtained, so as to keep the temperature in the fresh-keeping area stable at the fastest and most accurate speed, with the advantages of fine regulation, energy saving and high efficiency.

[0088] Further, for the refrigeration control method of the refrigeration equipment, the refrigerant flowing in the refrigeration circuit is R600a, and λ is 5%.

[0089] Specifically, in this embodiment, the refrigeration equipment is explained by taking a household refrigerator as an example. The evaporation temperature of the refrigerating evaporator 15 of a household refrigerator generally does not exceed the range of -20°C to 0°C, and most household refrigerators currently use R600a as the refrigerant. When the temperature of the R600a refrigerant is in the range of 20°C to 0°C, the pressure needs to be reduced by 0.003 - 0.005 MPa for every 1°C decrease, which is converted to a pressure reduction of 3% - 7%. The median or average of 3% - 7% is 5%.

[0090] Preferably, T 预设1 is 0.5°C, and K 初始 is 50%.

[0091] In this embodiment, when K 初始 is 50% and λ is 5%, when |T1 - T2| ≥ 20, K = 100%,

[0092] To solve the above problems, the present invention also provides a refrigeration equipment.

[0093] A refrigeration equipment includes a control unit, and the control unit includes a memory and a processor. The memory stores a computer program that can run on the processor, and when the processor executes the computer program, it implements the refrigeration control method of the refrigeration equipment as described above.

[0094] Further, the refrigeration equipment includes a box body and a refrigeration system disposed in the box body.

[0095] Further, the refrigeration system can be a single-system refrigeration system. The box body defines a refrigerating compartment. The refrigerating compartment includes a refrigerating area and a fresh-keeping area other than the refrigerating area. The single-system refrigeration system includes a refrigerating supply circuit formed by sequentially connecting a compressor 11, a condenser 12, a refrigerating capillary tube 13, a throttle valve 14, and a refrigerating evaporator 15. The refrigerating evaporator 15 is used to provide cold for the refrigerating compartment. The refrigerating compartment includes a refrigerating area and a fresh-keeping area other than the refrigerating area.

[0096] Referring to Figure 1As shown, further, the refrigeration system can also be a dual-system refrigeration system. The box body defines a refrigeration compartment and a freezer compartment, and the refrigeration system includes a refrigeration and cooling circuit formed by a compressor 11, a condenser 12, a freezing capillary 16, and a freezing evaporator 17 connected by pipelines. Among them, when the actual temperature of the freezer compartment reaches the start-up temperature of the compressor 11, the compressor 11, the condenser 12, the freezing capillary 16, and the freezing evaporator 17 are connected in sequence. The freezing evaporator 17 is used to provide coldness for the freezer compartment.

[0097] The refrigeration system also includes a refrigeration cold supply branch circuit arranged in parallel with the freezing capillary tube 16. The refrigeration cold supply branch circuit includes a refrigeration capillary tube 13, a throttle valve 14, and a refrigeration evaporator 15 connected in series through a pipeline. When the refrigeration cold supply branch circuit is switched to be connected between the condenser 12 and the freezing evaporator 17, the compressor 11, the condenser 12, the refrigeration capillary tube 13, the throttle valve 14, the refrigeration evaporator 15, and the freezing evaporator 17 are connected in sequence. The refrigeration evaporator 15 is used to provide coldness for the refrigerated compartment.

[0098] By reducing or increasing the opening K of the throttle valve 14, when the throttle valve 14 reduces or increases the cross-sectional area of ​​the pipeline, the resistance increases or decreases, the flow rate of the liquid or gas slows down or speeds up, and the flow rate decreases or increases, resulting in an increase or decrease in the refrigerant pressure of the refrigeration system. The evaporation temperature of the refrigeration evaporator 15 increases or decreases. The temperature fluctuation of the fresh-keeping area during the refrigeration process can be reduced.

[0099] When the refrigeration cooling branch is connected between the condenser 12 and the freezing evaporator 17, the refrigeration cooling circuit is connected.

[0100] It can be understood that the control unit is electrically connected to the components of the refrigeration system to control whether the refrigeration cooling branch is connected between the condenser 12 and the freezing evaporator 17 to control whether the refrigeration cooling circuit is connected.

[0101] The cold storage room includes the cold storage area and the fresh-keeping area other than the cold storage area.

[0102] Furthermore, the refrigeration system further includes a three-way solenoid valve 18 connected to the outlet pipeline of the condenser 12 , and the three-way solenoid valve 18 has one inlet and two outlets.

[0103] Among them, the inlet of the three-way solenoid valve 18 is connected to the pipeline at the outlet end of the condenser 12; one outlet of the three-way solenoid valve 18 is connected to the freezing capillary 16; and the other outlet of the three-way solenoid valve 18 is connected to the refrigeration cooling branch.

[0104] When the inlet of the three-way solenoid valve 18 is connected to one outlet of the three-way solenoid valve 18, the freezing cooling circuit is connected, and when the inlet of the three-way solenoid valve 18 is connected to the other outlet of the three-way solenoid valve 18, the refrigeration cooling circuit is connected. By switching the three-way solenoid valve 18, the switching and connection of the freezing cooling circuit and the refrigeration cooling circuit are realized, which has the advantages of easy switching, easy implementation, and simple control method.

[0105] Furthermore, the refrigeration system also includes a variable temperature cooling branch arranged in parallel with the freezing capillary tube 16 .

[0106] Compared with the prior art, the refrigeration control method and refrigeration equipment provided by the present invention preliminarily determine whether the cold storage room needs refrigeration according to the size relationship between Ta, T1, and T2, and then determine whether to connect the cold storage cold supply circuit to supply cold storage to the cold storage room according to the absolute value of the temperature difference between the cold storage area and the fresh-keeping area |T1-T2|, accurately control the connection of the cold storage cold supply circuit to achieve energy saving, and determine the opening K of the throttle valve 14 of the cold storage cold supply circuit according to |T1-T2|, so that the evaporation temperature of the cold storage evaporator 15 increases or decreases. By adjusting the cold storage evaporation temperature, the temperature fluctuation of the fresh-keeping area during the refrigeration process can be reduced. The temperature of the fresh-keeping area is kept stable as soon as possible. By adding a throttle valve 14 and increasing the control logic in conjunction with the throttle valve 14, the fresh-keeping effect of the cold storage room can be improved, and the temperature in the fresh-keeping area can be controlled, which has the advantages of reducing costs, being easy to implement, easy to control, and having good fresh-keeping effects.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A refrigeration control method for a refrigeration device, characterized in that: Including: Obtain the set temperature Ta of the refrigerated compartment of the refrigeration equipment, the actual temperature T1 of the refrigerated area in the refrigerated compartment, and the actual temperature T2 of the fresh-keeping area in the refrigerated compartment, and determine whether Ta, T1, and T2 satisfy Ta≥T1 and Ta≥T2; When Ta, T1, and T2 satisfy Ta≥T1≥T2 or Ta≥T2≥T1, disconnect the refrigeration supply circuit that provides cooling to the refrigerated compartment; When Ta, T1, and T2 satisfy Ta<T1≤T2 or Ta<T2≤T1, connect the refrigeration supply circuit, and determine the opening degree K of the throttle valve of the refrigeration supply circuit according to the absolute value 丨T1 - T2丨 of the temperature difference between the refrigerated area and the fresh-keeping area. Among them, the refrigeration supply circuit includes a compressor, a condenser, a refrigerated capillary tube, a throttle valve, and a refrigerated evaporator; When Ta, T1, and T2 satisfy T1≤Ta<T2 or T1≤Ta<T2, determine whether to connect the refrigeration supply circuit according to the value of 丨T1 - T2丨, and determine the opening degree K of the throttle valve according to 丨T1 - T2丨.

2. The refrigeration control method of the refrigeration equipment according to claim 1, characterized in that: When Ta, T1, and T2 satisfy Ta < T1 ≤ T2 or Ta < T2 ≤ T1, obtain the value of |T1 - T2|, and determine whether |T1 - T2| satisfies |T1 - T2| ≤ T 预设1 , T 预设1 is defined as the preset lower limit value of the temperature difference between the refrigerating zone and the fresh-keeping zone; When |T1 - T2| satisfies |T1 - T2| ≤ T 预设1 set K to be negatively correlated with the value of |T1 - T2|; When |T1 - T2| satisfies |T1 - T2| > T 预设1 it is set that K is positively correlated with the value of |T1 - T2|, where the maximum value of K is 100%.

3. The refrigeration control method of the refrigeration equipment according to claim 2, characterized in that: When |T1 - T2| satisfies |T1 - T2| ≤ T 预设1 set K = K 初始 - Δ K , where K 初始 is defined as the initial preset value of the throttle valve, and Δ K is positively correlated with the value of |T1 - T2|; When |T1 - T2| satisfies |T1 - T2| > T 预设1 set K = K 初始 + Δ K .

4. The refrigeration control method of the refrigeration equipment according to claim 1, characterized in that: When Ta, T1, and T2 satisfy T1 ≤ Ta < T2 or T1 ≤ Ta < T2, obtain the value of |T1 - T2|, and determine whether |T1 - T2| satisfies |T1 - T2| ≤ T 预设1 , T 预设1 is defined as the preset lower limit value of the temperature difference between the refrigerating zone and the fresh-keeping zone; When |T1 - T2| satisfies |T1 - T2| ≤ T 预设1 the refrigeration cooling circuit is set to be disconnected; When |T1 - T2| satisfies |T1 - T2| > T 预设1 the refrigerating and cooling supply loop is connected, and it is set that K is positively correlated with the value of |T1 - T2|, where the maximum value of K is 100%.

5. The refrigeration control method of the refrigeration equipment according to claim 4, characterized in that: When |T1 - T2| satisfies |T1 - T2| > T 预设1 set K = K 初始 + Δ K , where Δ K is positively correlated with the value of |T1 - T2|.

6. The refrigeration control method for refrigeration equipment according to claim 3 or 5, characterized in that: The aforementioned Δ K = λ丨T1 - T2丨, where λ is defined as the median value of the percentage by which the pressure value corresponding to the refrigerant decreases when the temperature of the refrigerant flowing in the refrigeration cooling circuit decreases by 1°C.

7. The refrigeration control method of refrigeration equipment according to claim 6, characterized in that: The refrigerant flowing in the refrigeration supply circuit is R600a, and λ is 5%.

8. The refrigeration control method for refrigeration equipment according to claim 3 or 5, characterized in that: T 预设1 0.5℃, K 初始 is 50%.

9. A refrigeration device, characterized in that: Including a control unit, the control unit includes a memory and a processor. The memory stores a computer program that can run on the processor. When the processor executes the computer program, it implements the refrigeration control method of the refrigeration equipment according to any one of claims 1-8.

10. The refrigeration device according to claim 9, characterized in that: Including a box body and a refrigeration system arranged in the box body. The box body defines a refrigerated compartment and a frozen compartment. The refrigeration system includes a frozen refrigeration supply circuit formed by a compressor, a condenser, a frozen capillary tube, and a frozen evaporator connected by pipelines. The refrigeration system further includes a refrigerated supply branch connected in parallel with the frozen capillary tube. The refrigerated supply branch includes a refrigerated capillary tube, a throttle valve, and a refrigerated evaporator connected in series by pipelines. When the refrigerated supply branch is connected between the condenser and the frozen evaporator, the aforementioned refrigeration supply circuit is connected; The frozen evaporator is used to provide cooling for the frozen compartment; the refrigerated evaporator is used to provide cooling for the refrigerated compartment; The refrigerated compartment includes a refrigerated area and a fresh-keeping area other than the refrigerated area.

11. The refrigeration equipment according to claim 10, characterized in that: The refrigeration system further includes a three-way solenoid valve connected to the outlet pipeline of the condenser. The three-way solenoid valve has one inlet and two outlets; Among them, the inlet of the three-way solenoid valve is connected to the pipeline at the outlet end of the condenser; One outlet of the three-way solenoid valve is connected to the frozen capillary tube; The other outlet of the three-way solenoid valve is connected to the refrigerated supply branch.

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