阅读说明：本技术 制冷设备的控制方法、装置、控制器和制冷设备 (Control method and device of refrigeration equipment, controller and refrigeration equipment ) 是由 李福良 么宇 张辰 孙庆一鸣 苗志强 于 2021-08-12 设计创作，主要内容包括：本申请涉及一种制冷设备的控制方法、装置、控制器和制冷设备。在对制冷设备进行制冷控制时,通过获取电子膨胀阀的当前开度值；根据预先建立的压缩机的频率与电子膨胀阀的开度值的对应关系,确定与电子膨胀阀的当前开度值相对应的压缩机的目标频率；进而控制压缩机以目标频率运行,从而可以根据多个电子膨胀阀的实际开度值,确定压缩机对应的目标频率,进而控制压缩机运行,也即能够实现电子膨胀阀调节和压缩机变频的协同控制,从而能够充分满足制冷需求,提升制冷设备的运行效率,加强制冷设备的运行稳定性,减少能源浪费。(The application relates to a control method and device of refrigeration equipment, a controller and the refrigeration equipment. When refrigeration control is performed on refrigeration equipment, the current opening value of the electronic expansion valve is obtained; determining the target frequency of the compressor corresponding to the current opening value of the electronic expansion valve according to the pre-established corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve; and then control the compressor and operate with the target frequency to can confirm the target frequency that the compressor corresponds according to a plurality of electronic expansion valve's actual opening value, and then control the compressor operation, also can realize the coordinated control of electronic expansion valve regulation and compressor frequency conversion, thereby can fully satisfy refrigeration demand, promote refrigeration plant's operating efficiency, strengthen refrigeration plant's operating stability, reduce the energy waste.)

1. A method of controlling a refrigeration apparatus, comprising:

acquiring a current opening value of the electronic expansion valve;

determining the target frequency of the compressor corresponding to the current opening value of the electronic expansion valve according to the pre-established corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve;

and controlling the compressor to run at the target frequency.

2. The method of claim 1, wherein the refrigeration apparatus comprises a plurality of evaporation branches connected in parallel with each other, and each of the evaporation branches comprises an electronic expansion valve and an evaporator connected to the electronic expansion valve;

the acquiring of the current opening value of the electronic expansion valve comprises the following steps:

respectively acquiring the current opening value of each electronic expansion valve;

correspondingly, the determining the target frequency of the compressor corresponding to the current opening value of the electronic expansion valve according to the pre-established corresponding relationship between the frequency of the compressor and the opening value of the electronic expansion valve includes:

and determining the target frequency of the compressor corresponding to the current opening values of all the electronic expansion valves according to the pre-established corresponding relation between the frequency of the compressor and the opening values of the electronic expansion valves.

3. The method of claim 1, wherein obtaining the current opening value of the electronic expansion valve further comprises:

acquiring the current superheat degree of an evaporator corresponding to the electronic expansion valve;

and adjusting the opening value of the corresponding electronic expansion valve based on the current superheat degree and a preset target superheat degree.

4. The method of claim 1, wherein the establishing of the correspondence between the frequency of the compressor and the opening value of the electronic expansion valve comprises:

under a preset working condition, acquiring flow data corresponding to different frequencies of a compressor of the refrigeration equipment, and fitting according to the flow data corresponding to the different frequencies to obtain a corresponding relation between flow and frequency;

under the preset working condition, collecting flow data corresponding to different opening values of the electronic expansion valves of the evaporation branches, and fitting according to the flow data corresponding to the different opening values to obtain a corresponding relation between the flow and the opening values;

and establishing a corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve based on the corresponding relation between the flow and the frequency and the corresponding relation between the flow and the opening value.

5. The method of claim 4, wherein the predetermined operating condition comprises a standard operating condition of a refrigeration appliance.

6. The method of claim 2, wherein determining the target frequency of the compressor corresponding to the current opening values of all electronic expansion valves according to a pre-established correspondence between the frequency of the compressor and the opening values of the electronic expansion valves comprises:

respectively determining the frequency of the compressor corresponding to the current opening value of each electronic expansion valve according to the pre-established corresponding relationship between the frequency of the compressor and the opening value of the electronic expansion valve;

and accumulating the frequencies of the compressors corresponding to the current opening values of the electronic expansion valves to obtain the target frequency.

7. A control device for a refrigeration apparatus, comprising:

the first acquisition module is used for acquiring the current opening value of the electronic expansion valve;

the first determining module is used for determining the target frequency of the compressor corresponding to the current opening value of the electronic expansion valve according to the pre-established corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve;

and the control module is used for controlling the compressor to operate at the target frequency.

8. The apparatus of claim 7, wherein the refrigeration equipment comprises a plurality of evaporation branches connected in parallel with each other, and each evaporation branch comprises an electronic expansion valve and an evaporator connected with the electronic expansion valve;

the acquisition module is specifically used for respectively acquiring the current opening value of each electronic expansion valve;

the first determining module is specifically configured to determine, according to a pre-established correspondence between the frequency of the compressor and the opening degree values of the electronic expansion valves, a target frequency of the compressor corresponding to the current opening degree values of all the electronic expansion valves.

9. The apparatus of claim 7, further comprising:

the second acquisition module is used for acquiring the current superheat degree of the evaporator corresponding to the electronic expansion valve;

and the adjusting module is used for adjusting the opening value of the corresponding electronic expansion valve based on the current superheat degree and a preset target superheat degree.

10. The apparatus of claim 7, wherein the establishing of the correspondence between the frequency of the compressor and the opening degree value of the electronic expansion valve comprises:

under a preset working condition, acquiring flow data corresponding to different frequencies of a compressor of the refrigeration equipment, and fitting according to the flow data corresponding to the different frequencies to obtain a corresponding relation between flow and frequency;

under the preset working condition, collecting flow data corresponding to different opening values of the electronic expansion valves of the evaporation branches, and fitting according to the flow data corresponding to the different opening values to obtain a corresponding relation between the flow and the opening values;

and establishing a corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve based on the corresponding relation between the flow and the frequency and the corresponding relation between the flow and the opening value.

11. The apparatus of claim 10, wherein the predetermined operating condition comprises a standard operating condition of a refrigeration appliance.

12. The apparatus of claim 8, wherein the first determining module, when determining the target frequency of the compressor corresponding to the current opening values of all the electronic expansion valves according to the pre-established correspondence between the frequency of the compressor and the opening values of the electronic expansion valves, is specifically configured to:

respectively determining the frequency of the compressor corresponding to the current opening value of each electronic expansion valve according to the pre-established corresponding relationship between the frequency of the compressor and the opening value of the electronic expansion valve;

and accumulating the frequencies of the compressors corresponding to the current opening values of the electronic expansion valves to obtain the target frequency.

13. A controller for a refrigeration appliance, comprising:

a memory and a processor coupled to the memory;

the memory is used for storing a program for implementing at least a control method of a refrigeration appliance according to any one of claims 1 to 6;

the processor is used for calling and executing the program stored in the memory.

14. A refrigeration appliance, characterized in that a control of a refrigeration appliance as claimed in claim 13 is provided.

15. The refrigeration apparatus as recited in claim 14 comprising a plurality of evaporation branches connected in parallel with each other, and each of the evaporation branches includes an electronic expansion valve and an evaporator connected to the electronic expansion valve.

Technical Field

The application relates to the technical field of refrigeration equipment, in particular to a control method and device of refrigeration equipment, a controller and the refrigeration equipment.

Background

In the refrigeration process of the refrigeration equipment, the problems of opening adjustment of the electronic expansion valve and variable frequency adjustment of the compressor can be involved. At present, the adjustment of the electronic expansion valve and the electronic expansion valve are respectively and independently carried out, wherein the electronic expansion valve is controlled by the system according to the refrigeration condition, so that various parameter disturbances are generated in the whole refrigeration system, the compressor is controlled by the condensing unit according to the parameters, thus the phenomenon of lag or overshoot is easy to occur, the compressor and the electronic expansion valve can not achieve matching cooperation in a short time, and the problem that the whole refrigeration device is difficult to ensure to be in the optimal operation state is particularly obvious in the refrigeration device with one drive and multiple (namely, one condensing unit drives multiple evaporators, for example, a plurality of refrigeration display cabinets in the current convenience store or the similar place adopt the form of one drive and multiple display cabinets for refrigeration), the problem that the flow distribution of system refrigerants is involved in the refrigeration device with one drive and multiple refrigeration devices (determined by the opening degree of the electronic expansion valve of each evaporation branch circuit) further causes the whole refrigeration device to be difficult to be in the optimal operation state, further resulting in waste of energy.

Disclosure of Invention

The application provides a control method and device of refrigeration equipment, a controller and the refrigeration equipment, and aims to solve the problem that in the traditional refrigeration equipment, matching cooperation cannot be achieved in a short time of a compressor and an electronic expansion valve, so that the whole refrigeration equipment is difficult to guarantee to be in an optimal running state, and energy waste is caused.

The above object of the present application is achieved by the following technical solutions:

in a first aspect, an embodiment of the present application provides a method for controlling a refrigeration apparatus, including:

acquiring a current opening value of the electronic expansion valve;

determining the target frequency of the compressor corresponding to the current opening value of the electronic expansion valve according to the pre-established corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve;

and controlling the compressor to run at the target frequency.

Optionally, the refrigeration equipment includes a plurality of evaporation branches connected in parallel, and each evaporation branch includes an electronic expansion valve and an evaporator connected to the electronic expansion valve;

the acquiring of the current opening value of the electronic expansion valve comprises the following steps:

respectively acquiring the current opening value of each electronic expansion valve;

correspondingly, the determining the target frequency of the compressor corresponding to the current opening value of the electronic expansion valve according to the pre-established corresponding relationship between the frequency of the compressor and the opening value of the electronic expansion valve includes:

and determining the target frequency of the compressor corresponding to the current opening values of all the electronic expansion valves according to the pre-established corresponding relation between the frequency of the compressor and the opening values of the electronic expansion valves.

Optionally, the obtaining a current opening value of the electronic expansion valve further includes:

acquiring the current superheat degree of an evaporator corresponding to the electronic expansion valve;

and adjusting the opening value of the corresponding electronic expansion valve based on the current superheat degree and a preset target superheat degree.

Optionally, the process of establishing the correspondence between the frequency of the compressor and the opening value of the electronic expansion valve includes:

under a preset working condition, acquiring flow data corresponding to different frequencies of a compressor of the refrigeration equipment, and fitting according to the flow data corresponding to the different frequencies to obtain a corresponding relation between flow and frequency;

under the preset working condition, collecting flow data corresponding to different opening values of the electronic expansion valves of the evaporation branches, and fitting according to the flow data corresponding to the different opening values to obtain a corresponding relation between the flow and the opening values;

and establishing a corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve based on the corresponding relation between the flow and the frequency and the corresponding relation between the flow and the opening value.

Optionally, the preset working condition includes a standard working condition of the refrigeration equipment.

Optionally, the determining, according to a pre-established correspondence between the frequency of the compressor and the opening degree value of the electronic expansion valve, the target frequency of the compressor corresponding to the current opening degree values of all the electronic expansion valves includes:

respectively determining the frequency of the compressor corresponding to the current opening value of each electronic expansion valve according to the pre-established corresponding relationship between the frequency of the compressor and the opening value of the electronic expansion valve;

and accumulating the frequencies of the compressors corresponding to the current opening values of the electronic expansion valves to obtain the target frequency.

In a second aspect, an embodiment of the present application further provides a control device for a refrigeration apparatus, including:

the first acquisition module is used for acquiring the current opening value of the electronic expansion valve;

the first determining module is used for determining the target frequency of the compressor corresponding to the current opening value of the electronic expansion valve according to the pre-established corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve;

and the control module is used for controlling the compressor to operate at the target frequency.

Optionally, the refrigeration device includes a plurality of evaporation branches connected in parallel, and each evaporation branch includes an electronic expansion valve and an evaporator connected to the electronic expansion valve;

the acquisition module is specifically used for respectively acquiring the current opening value of each electronic expansion valve;

the first determining module is specifically configured to determine, according to a pre-established correspondence between the frequency of the compressor and the opening degree values of the electronic expansion valves, a target frequency of the compressor corresponding to the current opening degree values of all the electronic expansion valves.

Optionally, the apparatus further comprises:

the second acquisition module is used for acquiring the current superheat degree of the evaporator corresponding to the electronic expansion valve;

and the adjusting module is used for adjusting the opening value of the corresponding electronic expansion valve based on the current superheat degree and a preset target superheat degree.

Optionally, the process of establishing the correspondence between the frequency of the compressor and the opening value of the electronic expansion valve includes:

under a preset working condition, acquiring flow data corresponding to different frequencies of a compressor of the refrigeration equipment, and fitting according to the flow data corresponding to the different frequencies to obtain a corresponding relation between flow and frequency;

under the preset working condition, collecting flow data corresponding to different opening values of the electronic expansion valves of the evaporation branches, and fitting according to the flow data corresponding to the different opening values to obtain a corresponding relation between the flow and the opening values;

and establishing a corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve based on the corresponding relation between the flow and the frequency and the corresponding relation between the flow and the opening value.

Optionally, the preset working condition includes a standard working condition of the refrigeration equipment.

Optionally, when determining the target frequency of the compressor corresponding to the current opening values of all the electronic expansion valves according to a pre-established correspondence between the frequency of the compressor and the opening values of the electronic expansion valves, the first determining module is specifically configured to:

respectively determining the frequency of the compressor corresponding to the current opening value of each electronic expansion valve according to the pre-established corresponding relationship between the frequency of the compressor and the opening value of the electronic expansion valve;

and accumulating the frequencies of the compressors corresponding to the current opening values of the electronic expansion valves to obtain the target frequency.

In a third aspect, an embodiment of the present application further provides a controller of a refrigeration apparatus, including:

a memory and a processor coupled to the memory;

the memory is used for storing a program at least for implementing the control method of the refrigeration apparatus according to any one of the first aspect;

the processor is used for calling and executing the program stored in the memory.

In a fourth aspect, embodiments of the present application further provide a refrigeration apparatus provided with the controller of the refrigeration apparatus according to the third aspect.

Optionally, the refrigeration apparatus includes a plurality of evaporation branches connected in parallel, and each evaporation branch includes an electronic expansion valve and an evaporator connected to the electronic expansion valve.

The technical scheme provided by the embodiment of the application can have the following beneficial effects:

according to the technical scheme provided by the embodiment of the application, when refrigeration control is carried out on refrigeration equipment, the current opening value of the electronic expansion valve is obtained; determining the target frequency of the compressor corresponding to the current opening value of the electronic expansion valve according to the pre-established corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve; the compressor is controlled to operate at the target frequency, so that the target frequency corresponding to the compressor can be determined according to the actual opening value of the electronic expansion valve, the operation of the compressor is controlled, the electronic expansion valve can be adjusted and the frequency conversion of the compressor can be cooperatively controlled, the refrigeration requirement can be fully met, the operation efficiency of refrigeration equipment is improved, the operation stability of the refrigeration equipment is enhanced, and the energy waste is reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic diagram of a "one-drive-many" showcase apparatus to which the control method of the present application can be applied;

FIG. 2 is a schematic diagram of the refrigeration circuit within each of the display cases of FIG. 1;

fig. 3 is a schematic flowchart of a control method of a refrigeration apparatus according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a control process for applying the method of FIG. 3 to the showcase apparatus of FIG. 1;

fig. 5 is a schematic structural diagram of a control device of a refrigeration apparatus according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a controller of a refrigeration apparatus according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

In order to make the technical solution of the present application easier to understand, the structure and operation principle of the related refrigeration equipment to which the control method of the present application can be applied will be briefly described with reference to the accompanying drawings. It should be noted that, first, the control method of the present application may be applied to a "one-driving-one (single evaporation branch)" refrigeration device, and may also be applied to a "one-driving-multiple (multiple evaporation branches)" refrigeration device, however, since the difference between the one-driving-one refrigeration device and the one-driving-multiple refrigeration device is mainly the difference in the number of evaporation branches, when explaining the structure of the refrigeration device, only the "one-driving-multiple" refrigeration device is taken as an example for explanation.

Referring to fig. 1 and 2, fig. 1 is a schematic diagram of a "one-drive-many" showcase apparatus to which the control method of the present application can be applied, and fig. 2 is a schematic diagram of a refrigeration circuit (i.e., an evaporation branch) inside each of the showcases in fig. 1. As shown in fig. 1, the apparatus comprises a condensing unit and three showcases (i.e., showcase 1, showcase 2, and showcase 3) connected in parallel, wherein the condensing unit includes a compressor, a condenser, and the like (not shown in the drawings) for generating a low-temperature liquid refrigerant, and the low-temperature liquid refrigerant is introduced into the three showcases through liquid supply pipes, respectively; as shown in fig. 2, the refrigeration circuit (i.e., the evaporation branch) of the showcase mainly includes an electromagnetic valve, a filter, an electronic expansion valve and an evaporator connected in sequence, and the liquid refrigerant enters the evaporator through the electronic expansion valve to be changed into a gaseous refrigerant after heat exchange, and then returns to the condensing unit through the air return pipe, thereby implementing the refrigeration cycle. In addition, a cabinet temperature sensing bulb is arranged in the display cabinet and used for collecting the real-time temperature in the cabinet, so that the adjustment of system parameters can be realized through the relative relation between the real-time temperature and the target refrigeration temperature set by a user.

In the refrigeration process, the flow of the refrigerant entering the evaporator can be adjusted by adjusting the opening value of the electronic expansion valve, so that the refrigerating capacity and the refrigerating efficiency are adjusted. The opening value adjusting principle of the electronic expansion valve is as follows: the target superheat degree Delta T of the evaporator is pre-determined according to factors such as refrigeration load and the like_TargetSetting, and respectively setting an inlet temperature sensing bag and an outlet temperature sensing bag at an inlet and an outlet of the evaporator, wherein the inlet temperature sensing bag and the outlet temperature sensing bag of the evaporator are respectively used for acquiring an inlet temperature value Tin (DEG C) and an outlet temperature value Tout (DEG C) of the evaporator so as to calculate the current superheat degree delta T (DEG C) of the evaporator, wherein the delta T is Tout-Tin; the system can then calculate the target superheat degree according to the current superheat degree delta T and the target superheat degree delta T_TargetThe relative relationship between the opening degree of the electronic expansion valve and the pressure difference is adjusted.

In addition, the refrigerating capacity and the refrigerating efficiency of the equipment can be adjusted by adjusting the frequency of the compressor, and the adjustment of the frequency of the compressor can also be based on the current superheat degree delta T and the target superheat degree delta T of the evaporator_TargetThe relative relationship of (a) to (b) is implemented.

In the traditional scheme, the current superheat degree delta T and the target superheat degree delta T of the evaporator are used as the basis_TargetThe relative relationship between the frequency of the compressor and the opening degree of the electronic expansion valve is independently adjusted. However, the inventors have found, after investigation, that Δ T and Δ T when one of the compressor frequency and the opening degree of the electronic expansion valve is adjusted_TargetHowever, in the conventional scheme, the other one is not fully considered in the process of adjusting, so that a phenomenon of hysteresis or overshoot occurs, and in order to cope with the hysteresis or overshoot, the system parameters need to be continuously fine-tuned, so that the whole system cannot be rapidly in a stable optimal operation state due to oscillation, and energy consumption loss is caused.

In order to solve the problems, the application provides a control method, a control device, a controller and refrigeration equipment of the refrigeration equipment, aiming at the refrigeration equipment, the cooperative control of electronic expansion valve adjustment and compressor frequency conversion is realized, so that the refrigeration requirement of a system is fully met, the operation efficiency of the refrigeration equipment is improved, the operation stability of the refrigeration equipment is enhanced, and the energy waste is reduced. The details of the embodiment are described below by way of examples.

Examples

Referring to fig. 3-4, fig. 3 is a flow chart illustrating a control method of a refrigeration apparatus according to an embodiment of the present application, and fig. 4 is a control process diagram illustrating the method of fig. 3 applied to the showcase apparatus of fig. 1. As shown in fig. 3, the method comprises at least the following steps:

s101: acquiring a current opening value of the electronic expansion valve;

in practical application, after the superheat degree of the evaporator is obtained, the superheat degree signal can be converted into an opening degree signal of the electronic expansion valve through a converter such as a fuzzy controller, and then the current opening degree value of the electronic expansion valve is obtained.

S102: determining the target frequency of the compressor corresponding to the current opening value of the electronic expansion valve according to the pre-established corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve;

specifically, in practical applications, when the system is in stable operation, a certain correspondence exists between the frequency of the compressor and the opening degree value of the electronic expansion valve, so that the specific condition of the correspondence can be predetermined, and the frequency of the compressor corresponding to the current opening degree value of the electronic expansion valve can be further determined based on the correspondence.

For example, in practical applications, the frequency of the compressor and the refrigerant flow rate have a corresponding relationship, and the opening value of the electronic expansion valve and the refrigerant flow rate have another corresponding relationship. Furthermore, the corresponding compressor frequency can be determined according to the current opening value of the electronic expansion valve.

S103: and controlling the compressor to run at the target frequency.

The target frequency of the compressor calculated in the previous step is matched with the current load required by the storage equipment (namely, the load, such as a display cabinet), and the coordinated adjustment of the opening degree of the electronic expansion valve and the frequency of the compressor can be realized. In addition, if the target refrigeration temperature set by the storage equipment changes, the load changes along with the change of the target refrigeration temperature, and the system can realize adjustment with a smaller amplitude by taking the previous adjustment as a reference to meet the current load, so that the system instability caused by frequent adjustment of the system can be effectively eliminated.

In the technical scheme provided by the embodiment of the application, when refrigeration control is performed on the refrigeration equipment, the current opening value of the electronic expansion valve is obtained; determining the target frequency of the compressor corresponding to the current opening value of the electronic expansion valve according to the pre-established corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve; the compressor is controlled to operate at the target frequency, so that the target frequency corresponding to the compressor can be determined according to the actual opening value of the electronic expansion valve, the operation of the compressor is controlled, the electronic expansion valve can be adjusted and the frequency conversion of the compressor can be cooperatively controlled, the refrigeration requirement can be fully met, the operation efficiency of refrigeration equipment is improved, the operation stability of the refrigeration equipment is enhanced, and the energy waste is reduced.

Further, in some embodiments, when the refrigeration apparatus is a one-to-many type refrigeration apparatus, that is, when the refrigeration apparatus includes a plurality of evaporation branches connected in parallel to each other (the evaporation branches also have a structure similar to the refrigeration circuit shown in fig. 2), and each evaporation branch includes an electronic expansion valve and an evaporator connected to the electronic expansion valve, the step S101, that is, the step of obtaining the current opening value of the electronic expansion valve specifically includes: respectively acquiring the current opening value of each electronic expansion valve; correspondingly, the step S102, namely, the step of determining the target frequency of the compressor corresponding to the current opening value of the electronic expansion valve according to the pre-established correspondence between the frequency of the compressor and the opening value of the electronic expansion valve, specifically includes: determining the target frequency of the compressor corresponding to the current opening values of all the electronic expansion valves according to the pre-established corresponding relation between the frequency of the compressor and the opening values of the electronic expansion valves,

that is, when the control method is applied to a multi-split refrigeration device, the current opening value of each electronic expansion valve can be respectively obtained, and then the target frequency of the compressor corresponding to the current opening values of all the electronic expansion valves is determined, so that the cooperative control of the opening adjustment of the electronic expansion valves and the frequency adjustment of the compressor is realized.

It should be noted that the refrigeration device shown in fig. 1 includes three evaporation branches (i.e. three showcases), but it should be understood that, in practical applications, the number of the evaporation branches of a one-to-many refrigeration device is not only three, but rather, the number thereof may be increased or decreased according to practical situations.

In addition, in some embodiments, before the step S101, that is, before the step of obtaining the current opening value of the electronic expansion valve, the method further includes: acquiring the current superheat degree of an evaporator corresponding to the electronic expansion valve; and adjusting the opening value of the corresponding electronic expansion valve based on the current superheat degree and a preset target superheat degree.

That is, in this embodiment, the current superheat Δ T and the target superheat Δ T of the evaporator may be based on the same as described above_TargetThe relative relation of the two parts realizes the adjustment of the opening value of the electronic expansion valve. If the refrigerating equipment is multi-split refrigerating equipment, different target superheat degrees can be set for different storage equipment in the same refrigerating equipment according to factors such as types, positions and loads of stored articles, and then evaporators of different storage equipment (different evaporation branches) can correspond to different target superheat degrees and current superheat degrees at the same time. Based on this, the opening degree values of different electronic expansion valves may be different at the same time.

Further, as a possible embodiment, the establishing of the correspondence relationship between the frequency of the compressor and the opening degree value of the electronic expansion valve includes:

under a preset working condition, acquiring flow data corresponding to different frequencies of a compressor of the refrigeration equipment, and fitting according to the flow data corresponding to the different frequencies to obtain a corresponding relation between flow and frequency; under the preset working condition, collecting flow data corresponding to different opening values of the electronic expansion valves of the evaporation branches, and fitting according to the flow data corresponding to the different opening values to obtain a corresponding relation between the flow and the opening values; and establishing a corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve based on the corresponding relation between the flow and the frequency and the corresponding relation between the flow and the opening value. The preset working condition may be a standard working condition.

That is, a large amount of real data (including data corresponding to frequency and flow, data corresponding to opening and flow, and the two data must be collected under the same working condition) may be collected through a previous experiment, and the corresponding relationship between flow and frequency and the corresponding relationship between flow and opening value are obtained through fitting based on the real data, and then the corresponding relationship between frequency and opening is further obtained.

For example, in some embodiments, the flow rate and the opening of the electronic expansion valve fitted to the collected data is as follows:

Q＝A₁+B₁N+C₁N²+… (1)

wherein Q is mass flow, N is opening step number of the electronic expansion valve, A₁、B₁、C₁… are all fitting coefficients.

It should be noted that, since the flow curves of different electronic expansion valves are different, the fitting coefficients in the relational expressions between the flow and the opening degree obtained by fitting to different electronic expansion valves are also different, but the fitting principle and the overall trend of the fitting result are the same. Therefore, in practical applications, if different electronic expansion valves are used in different evaporation branches of a multi-split refrigeration device, a relational expression between the flow rate and the opening degree needs to be obtained by fitting for each electronic expansion valve.

In addition, assume that the relationship between the flow rate and the compressor frequency, which is obtained by fitting the collected data, is:

Q＝A₂+B₂F+… (2)

in the formula (I), the compound is shown in the specification,q is mass flow, F is compressor frequency, A₂、B₂… … are all fitting coefficients.

Further, based on the equations (1) and (2), the relational expression between the compressor frequency and the opening degree of the electronic expansion valve is obtained with the mass flow rate Q as an intermediate quantity:

based on this, in some embodiments, if the method is applied to a multi-split refrigeration device, the determining the target frequency of the compressor corresponding to the current opening values of all the electronic expansion valves according to the pre-established correspondence relationship between the frequency of the compressor and the opening values of the electronic expansion valves includes: respectively determining the frequency of the compressor corresponding to the current opening value of each electronic expansion valve according to the pre-established corresponding relationship between the frequency of the compressor and the opening value of the electronic expansion valve; and accumulating the frequencies of the compressors corresponding to the current opening values of the electronic expansion valves to obtain the target frequency.

For example, when the unit operates under a certain condition, if the electronic expansion valves of the plurality of evaporation branches have the same structure and the opening values are X1, X2, X3 and … …, respectively, the required compressor frequency can be obtained according to the formula (3):

in the formula, F₁、F₂、F₃… …, respectively corresponding to the required compressor frequency for the opening of the electronic expansion valve in each evaporation branch, and accumulating the frequencies (for example, as shown in fig. 4, in practical application, the accumulation can be realized by a signal accumulator) to obtain the final required target frequency F of the compressor_Target：

F_Target＝F₁+F₂+F₃+… (5)

Therefore, the compressor frequency matched with the opening value of the electronic expansion valve can be obtained based on the opening value of the electronic expansion valve, namely, the opening value of the electronic expansion valve and the compressor frequency can be cooperatively adjusted through the control process.

In addition, based on the same inventive concept, the embodiment of the present application further provides a control device of a refrigeration apparatus, corresponding to the control method of the refrigeration apparatus provided in the above embodiment. The apparatus is a software and/or hardware based functional module for performing the above method.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a control device of a refrigeration apparatus according to an embodiment of the present application. As shown in fig. 5, the apparatus includes at least:

a first obtaining module 51, configured to obtain a current opening value of the electronic expansion valve;

a first determining module 52, configured to determine, according to a pre-established correspondence between a frequency of the compressor and an opening value of the electronic expansion valve, a target frequency of the compressor corresponding to a current opening value of the electronic expansion valve;

and a control module 53 for controlling the compressor to operate at the target frequency.

Optionally, the refrigeration device includes a plurality of evaporation branches connected in parallel, and each evaporation branch includes an electronic expansion valve and an evaporator connected to the electronic expansion valve;

the acquisition module is specifically used for respectively acquiring the current opening value of each electronic expansion valve;

the first determining module is specifically configured to determine, according to a pre-established correspondence between the frequency of the compressor and the opening degree values of the electronic expansion valves, a target frequency of the compressor corresponding to the current opening degree values of all the electronic expansion valves.

Optionally, the apparatus further comprises:

the second acquisition module is used for acquiring the current superheat degree of the evaporator corresponding to the electronic expansion valve;

and the adjusting module is used for adjusting the opening value of the corresponding electronic expansion valve based on the current superheat degree and a preset target superheat degree.

Optionally, the process of establishing the correspondence between the frequency of the compressor and the opening value of the electronic expansion valve includes:

under a preset working condition, acquiring flow data corresponding to different frequencies of a compressor of the refrigeration equipment, and fitting according to the flow data corresponding to the different frequencies to obtain a corresponding relation between flow and frequency;

under the preset working condition, collecting flow data corresponding to different opening values of the electronic expansion valves of the evaporation branches, and fitting according to the flow data corresponding to the different opening values to obtain a corresponding relation between the flow and the opening values;

and establishing a corresponding relation between the frequency of the compressor and the opening value of the electronic expansion valve based on the corresponding relation between the flow and the frequency and the corresponding relation between the flow and the opening value.

Optionally, the preset working condition includes a standard working condition of the refrigeration equipment.

Optionally, when determining the target frequency of the compressor corresponding to the current opening values of all the electronic expansion valves according to the pre-established correspondence between the frequency of the compressor and the opening values of the electronic expansion valves, the first determining module 51 is specifically configured to:

respectively determining the frequency of the compressor corresponding to the current opening value of each electronic expansion valve according to the pre-established corresponding relationship between the frequency of the compressor and the opening value of the electronic expansion valve; and accumulating the frequencies of the compressors corresponding to the current opening values of the electronic expansion valves to obtain the target frequency.

For a specific implementation method of the steps executed by each module in the apparatus, reference may be made to the foregoing method embodiment, which is not described herein again.

In addition, based on the same inventive concept, the embodiment of the present application further provides a controller of a refrigeration apparatus, corresponding to the control method of the refrigeration apparatus provided in the above embodiment.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a controller of a refrigeration apparatus according to an embodiment of the present application. As shown in fig. 6, the controller includes a memory 61 and a processor 62 connected to the memory 61; the memory 61 is used for storing a program for implementing at least the control method of the refrigeration apparatus described in the foregoing embodiment; the processor 62 is used to call and execute the program stored in the memory 61.

For specific implementation methods of each step of the method implemented by the program, reference may be made to the foregoing method embodiments, and details are not described here again.

In addition, the embodiment of the application also provides a refrigeration device, which is provided with the controller of the refrigeration device, and the corresponding control method can be realized by applying the controller to the refrigeration device.

The refrigeration equipment can be multi-split refrigeration equipment, that is, the refrigeration equipment can comprise a plurality of evaporation branches which are connected in parallel, and each evaporation branch comprises an electronic expansion valve and an evaporator connected with the electronic expansion valve. The refrigeration device can also be a one-to-one refrigeration device, i.e. comprising only one evaporation branch.

Through the scheme, the target frequency corresponding to the compressor can be determined according to the actual opening value of the electronic expansion valve, so that the operation of the compressor is controlled, the electronic expansion valve can be adjusted and the frequency conversion of the compressor can be cooperatively controlled, the refrigeration demands of evaporation branches can be fully met, the operation efficiency of refrigeration equipment is improved, the operation stability of the refrigeration equipment is enhanced, and the energy waste is reduced.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.

It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.