Dual-compressor system and defrosting method thereof, and refrigeration equipment

Abstract

The application discloses a double-compressor system and a defrosting method thereof and a refrigeration equipment. The double-compressor system comprises a first compressor system and a second compressor system, and the two systems share a condenser. A first reversing valve is arranged on a first pipeline, and a first branch is connected between the first reversing valve and a front end of the condenser to a first evaporator. A second reversing valve is arranged on a second pipeline, and a second branch is connected between the second reversing valve and a rear end of the condenser to a second evaporator. The application provides the double-compressor system, and two refrigerant flow paths are arranged in each compressor system. According to the icing state of the evaporator, the working start state of the first compressor system and the second compressor system can be selected, and the selection of the refrigerant flow path can be controlled. Therefore, the function configuration is reasonably used, the defrosting control is more accurate and timely, and the energy consumption is reduced. When defrosting is performed by utilizing waste heat, the compressor does not stop, and the refrigeration function normally works.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, in particular to a double-compressor system, a defrosting method thereof and a refrigeration equipment. BACKGROUND

[0002] The volume of the refrigerator is small in the past, and one compressor can meet the refrigeration performance requirement. With the continuous increase of the volume of the refrigerator, one compressor cannot meet the refrigeration performance requirement, and a double-compressor refrigeration system is gradually developed. The existing air-cooled refrigerator realizes defrosting by setting a defrosting period and increasing a heating device on the evaporator, and uses a temperature sensor to control the exit of defrosting.

[0003] The monitoring of the temperature sensor has a lag, the defrosting exit time is delayed, the defrosting time is lengthened, the refrigeration is stopped during defrosting, the heat radiation generated during defrosting is increased, and meanwhile the heat radiation generated during defrosting can increase the temperature of the intermediate chamber, increase the energy consumption, and is not conducive to the preservation and storage of food. The compressor stops working during defrosting, the refrigeration system stops working, the temperature of the intermediate chamber rises, temperature fluctuation is caused, and it is not conducive to the preservation and storage of food.

[0004] In view of the problem that the defrosting scheme of the refrigeration equipment in the prior art cannot consider both waste heat defrosting and refrigeration without stopping, no effective solution has been proposed at present. SUMMARY

[0005] The double-compressor system, the defrosting method thereof and the refrigeration equipment provided in the embodiments of the present application solve the problem that the defrosting scheme of the refrigeration equipment in the prior art cannot consider both waste heat defrosting and refrigeration without stopping.

[0006] To solve the above technical problems, the present application provides a double-compressor system, wherein the double-compressor system comprises: a first compressor system and a second compressor system, both of which share one condenser, the first compressor system comprises, in sequence, a first capillary tube, a first evaporator and a first compressor, and the second compressor system comprises, in sequence, a second capillary tube, a second evaporator and a second compressor; the first compressor and the second compressor are connected to the front end of the condenser through a first pipeline, and the first capillary tube and the second capillary tube are connected to the rear end of the condenser through a second pipeline; a first reversing valve is arranged on the first pipeline, a first branch to the first evaporator is connected between the first reversing valve and the front end of the condenser, the first reversing valve is used to control the switching of the first pipeline and the first branch; a second reversing valve is arranged on the second pipeline, a second branch to the second evaporator is connected between the second reversing valve and the rear end of the condenser, and the second reversing valve is used to control the switching of the second pipeline and the second branch.

[0007] Further, the first evaporator and the second evaporator are provided with pressure sensors for detecting the weight change amount of the first evaporator and the weight change amount of the second evaporator; wherein the weight change amount of the first evaporator is used to determine the switching between the first pipeline and the first branch, and the weight change amount of the second evaporator is used to determine the switching between the second pipeline and the second branch.

[0008] Further, the first evaporator is provided with a first heater for defrosting, and the second evaporator is provided with a second heater for defrosting.

[0009] Further, the dual-compressor system further comprises a one-way valve arranged on the second pipeline for preventing refrigerant backflow when the pipeline switching between the second pipeline and the second branch is performed.

[0010] Further, the dual-compressor system further comprises a shunt valve arranged on the second pipeline for shunting the refrigerant flowing out of the rear end of the condenser to the first capillary of the first compressor system and the second capillary of the second compressor system.

[0011] The application further provides a defrosting method of a dual-compressor system, applied to the dual-compressor system, wherein the method comprises: detecting the weight change amount of the first evaporator and the weight change amount of the second evaporator within a preset time period; triggering the switching between the first pipeline and the first branch according to the weight change amount of the first evaporator; and triggering the switching between the second pipeline and the second branch according to the weight change amount of the second evaporator.

[0012] Further, triggering the switching between the first pipeline and the first branch according to the weight change amount of the first evaporator comprises: determining the icing state of the first evaporator according to the weight change amount of the first evaporator; wherein a range of weight change amount corresponding to different icing states is preset; determining the corresponding refrigerant flow path according to the icing state, and performing the switching between the first pipeline and the first branch.

[0013] Furthermore, the icing state includes at least: no ice state, low ice state, and high ice state; the corresponding refrigerant flow path is determined according to the icing state, and the switching between the first pipeline and the first branch is performed, including: if it is an ice-free state, the first compressor is controlled to work normally, the first heater is turned off, the first reversing valve is closed, and the corresponding refrigerant flow path is determined to be the first pipeline; if it is a low ice state, the first compressor is controlled to work normally, the first heater is turned off, the first reversing valve is opened, and the corresponding refrigerant flow path is determined to be the first branch; if it is a high ice state, the first compressor is controlled to turn off, the first heater is turned on, the first reversing valve is closed, and the corresponding refrigerant flow path is determined to be the first pipeline.

[0014] Furthermore, if there is a lot of ice, the method further includes: controlling the first compressor to shut down, the first heater to turn on, and the first reversing valve to close. After determining that the corresponding refrigerant flow path is the first pipeline, the method also includes: real-time detection of the weight change of the first evaporator; when the weight change corresponds to an ice-free state, exiting the defrosting mode and controlling the first compressor to work normally.

[0015] Furthermore, based on the weight change of the second evaporator, triggering the switching between the second pipe and the second branch includes: determining the icing state of the second evaporator based on the weight change of the second evaporator; wherein, a preset range of weight change corresponding to different icing states is provided; determining the corresponding refrigerant flow path based on the icing state, and performing the switching between the second pipe and the second branch.

[0016] Furthermore, the icing state includes at least: no ice state, low ice state, and high ice state; the corresponding refrigerant flow path is determined according to the icing state, and the switching between the second pipeline and the second branch is performed, including: if it is an ice-free state, the second compressor is controlled to operate normally, the second heater is turned off, the second reversing valve is closed, and the corresponding refrigerant flow path is determined to be the second pipeline; if it is a low ice state, the second compressor is controlled to operate normally, the second heater is turned off, the second reversing valve is opened, and the corresponding refrigerant flow path is determined to be the second branch; if it is a high ice state, the second compressor is controlled to turn off, the second heater is turned on, the second reversing valve is closed, and the corresponding refrigerant flow path is determined to be the second pipeline.

[0017] Furthermore, if there is a lot of ice, the second compressor is shut down, the second heater is turned on, and the second reversing valve is closed. After determining that the corresponding refrigerant flow path is the second pipeline, the method further includes: real-time detection of the weight change of the second evaporator; when the weight change corresponds to an ice-free state, the defrosting mode is exited and the second compressor is controlled to work normally.

[0018] The application further provides a defrosting device of a double-compressor system, wherein the device comprises: a detection module configured to detect a weight change amount of a first evaporator and a weight change amount of a second evaporator within a preset time period; a switching module configured to trigger switching between the first pipeline and the first branch according to the weight change amount of the first evaporator, and trigger switching between the second pipeline and the second branch according to the weight change amount of the second evaporator.

[0019] The application further provides a refrigeration device, wherein the refrigeration device comprises the double-compressor system.

[0020] The application further provides a computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and the program is executed by a processor to implement the method.

[0021] The application provides a double-compressor system, and two refrigerant flow paths are arranged in each compressor system, the working start state of the first compressor system and the second compressor system can be selected according to the icing state of the evaporator, and the selection of the refrigerant flow path is controlled, so that the function configuration is reasonably used, the defrosting control is more accurate and timely, and the energy consumption is reduced; the compressor does not stop working while defrosting by using waste heat, and the refrigeration function works normally; the number of times of stopping the compressor is reduced, the influence of the heater heat radiation on the temperature of the compartment is reduced, the fluctuation range of the temperature of the compartment is reduced, and food preservation and storage are more beneficial. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of a double-compressor system according to an embodiment of the application;

[0023] Figure 2 is a structural schematic diagram of an evaporator component according to an embodiment of the application;

[0024] Figure 3 is a flowchart of a defrosting method of a double-compressor system according to an embodiment of the application;

[0025] Figure 4 is a detailed flowchart of a defrosting method of a double-compressor system according to an embodiment of the application;

[0026] Figure 5 is a structural block diagram of a defrosting device of a double-compressor system according to an embodiment of the application;

[0027] In the figure, 1, condenser; 2, first compressor; 3, first evaporator; 4, first capillary; 5, second compressor; 6, second evaporator; 7, second capillary; 8, first reversing valve; 9, second reversing valve; 10, flow dividing valve; 11, check valve; 31, evaporator; 32, condenser branch; 33, heater; 34, pressure sensor. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0029] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two.

[0030] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0031] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present application to describe the compressor system, these should not be limited to these terms. These terms are only used to distinguish different compressor systems. For example, the first compressor system can also be referred to as the second compressor system without departing from the scope of the embodiments of the present application, and similarly, the second compressor system can also be referred to as the first compressor system.

[0032] Depending on the context, the word "if" as used herein can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if it is determined" or "if (a stated condition or event) is detected" can be interpreted as "when it is determined" or "in response to determining" or "when (a stated condition or event) is detected" or "in response to detecting (a stated condition or event)".

[0033] It is also to be noted that the terms "comprising", "containing", or any other similar phrase means "including, but not limited to", such that an unlisted element is not excluded from the item or process being described. In addition, it is to be understood that the term "or" as used herein is intended to mean "and / or", unless explicitly stated otherwise.

[0034] Optional embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0035] Embodiment 1

[0036] Figure 1 is a structural schematic diagram of a dual-compressor system according to an embodiment of the present application, as shown in the figure, the dual-compressor system comprises a first compressor system and a second compressor system, both of which share a condenser 1, the first compressor system comprises a first capillary tube 4, a first evaporator 3 and a first compressor 2 connected in sequence, and the second compressor system comprises a second capillary tube 7, a second evaporator 6 and a second compressor 5 connected in sequence. Figure 1

[0037] The first compressor 2 and the second compressor 5 are connected to the front end of the condenser 1 through a first pipeline (A pipeline), and the first capillary tube 4 and the second capillary tube 7 are connected to the rear end of the condenser 1 through a second pipeline (C pipeline).

[0038] A first reversing valve 8 is arranged on the first pipeline, and a first branch (B pipeline) is connected to the first evaporator 3 between the first reversing valve 8 and the front end of the condenser 1; the first reversing valve 8 is used to control the switching of the first pipeline and the first branch, and when the first reversing valve 8 is opened, the refrigerant flow path is switched from the first pipeline to the first branch.

[0039] A second reversing valve 9 is arranged on the second pipeline, and a second branch (D pipeline) is connected to the second evaporator 6 between the second reversing valve 9 and the rear end of the condenser 1; the second reversing valve 9 is used to control the switching of the second pipeline and the second branch, and when the second reversing valve 9 is opened, the refrigerant flow path is switched from the second pipeline to the second branch.

[0040] The embodiment provides a dual-compressor system, and two refrigerant flow paths are arranged in each compressor system, the working start state of the first compressor system and the second compressor system can be selected according to the icing state of the evaporator, and the selection of the refrigerant flow path is controlled. Thus, the function configuration is reasonably used, and the energy consumption is reduced.

[0041] ​The double-compressor system of the embodiment further comprises a one-way valve 11 arranged on the second pipeline to prevent backflow of refrigerant when the pipeline switching is performed between the second pipeline and the second branch. The shunt valve 10 is arranged on the second pipeline to shunt the refrigerant flowing out of the rear end of the condenser 1 to the first capillary 4 of the first compressor system and the second capillary 7 of the second compressor system.

[0042] Figure 2 is a schematic diagram of the evaporator component structure according to the embodiment of the present application, as Figure 2 shown, 31 is an evaporator, 32 is a condenser branch, a pressure sensor 34 is arranged on each of the first evaporator 3 and the second evaporator 6 to detect the weight change amount of the first evaporator 3 and the weight change amount of the second evaporator 6. The weight change amount of the first evaporator 3 is used to determine the switching between the first pipeline and the first branch, and the weight change amount of the second evaporator 6 is used to determine the switching between the second pipeline and the second branch. A heater 33 is arranged on each of the two evaporators, specifically, a first heater is arranged on the first evaporator to realize defrosting, and a second heater is arranged on the second evaporator to realize defrosting.

[0043] The embodiment provides the A pipeline and the B pipeline which can be switched with each other, and the C pipeline and the D pipeline which can be switched with each other. The A pipeline is a pipeline connecting the compressor and the condenser 1, and the C pipeline is a pipeline connecting the condenser 1 and the capillary. A branch B is connected to the first evaporator 3 at the front end of the condenser 1, and a branch D is connected to the second evaporator 6 at the rear end of the condenser 1. The first switching valve 8 and the second switching valve 9 are used to control the opening of the B and D branches, and a part of the waste heat is recovered to realize defrosting, which can reduce the opening times of the heating device and the shutdown times of the compressor. The assembly mode of the evaporator is changed from the screw fixing assembly to the kinematic pair assembly, which can realize the up-down movement. A pressure sensor is arranged at the lower end of the evaporator to measure the weight change of the evaporator. When the large-capacity refrigerator is just started to work or the temperature difference between the chamber temperature and the set temperature is large, the first and second compressor systems work simultaneously. When the refrigeration system works for a long time, the temperature difference between the chamber temperature and the set temperature is small, and the second compressor system stops working, and only the first compressor system works.

[0044] The working principle of the dual-compressor system is as follows: when the first compressor system and the second compressor system work simultaneously, the refrigerant is converted into a high-temperature and high-pressure state after passing through the first compressor 2 and the second compressor 5; then, the first reversing valve 8 determines whether to pass through the A or B pipeline according to the weight change amount ΔG1 of the first evaporator 3, and when passing through the B pipeline, part of the waste heat can be used for defrosting the first evaporator 3; then, the refrigerant reaches the condenser 1, and the condenser device 1 dissipates the heat of the high-temperature and high-pressure refrigerant sent by the compressor to the air; the second reversing valve 9 at the tail end of the condenser 1 determines whether to pass through the C or D pipeline according to the weight change amount ΔG2 of the second evaporator 6, and when passing through the D pipeline, part of the waste heat can be used for defrosting the second evaporator 6; when the refrigerant passes through the B pipeline or the D pipeline, the length of the condenser 1 is equivalent to being extended, and heat dissipation is accelerated.

[0045] The function of the one-way valve 11 is to prevent the refrigerant from flowing back when the pipeline is switched. After passing through the condenser 1, the refrigerant is converted into a high-pressure and constant-temperature state, and the flow valve 10 divides the refrigerant into the first and second compressor systems. Then, the refrigerant reaches the first and second capillary tubes 4 and 7, respectively, and the capillary tubes convert the refrigerant from a high-pressure and constant-temperature state into a low-pressure and low-temperature state. Then, the refrigerant reaches the first and second evaporators 3 and 6, respectively, and the evaporator device evaporates the low-temperature and low-pressure refrigerant liquid sent by the capillary tube into saturated steam after absorbing the heat in the heat sink. Then, the refrigerant passes through the first and second compressors 2 and 5, respectively, and the compressor converts the refrigerant into a high-temperature and high-pressure state, thereby forming a cycle and completing the heat transfer.

[0046] The embodiment also provides a refrigeration device, which comprises the dual-compressor system described above, and the refrigeration device can be a refrigerator, a freezer or the like.

[0047] The dual-compressor refrigeration system is composed of a first compressor system and a second compressor system, and the powers of the first and second compressors are different. The first compressor is a main compressor, and the power is a larger value. The second compressor is a secondary compressor, and the power is a smaller value. When the refrigerator is just started, a large amount of food is put in at one time, the door is opened and closed multiple times in a short time, or the like, the temperature in the compartment is greatly different from the set temperature, and the first and second compressors work simultaneously. When the refrigeration system works for a period of time, the temperature in the compartment is less different from the set temperature, and only the first compressor system is started, so that the function configuration is more reasonable and more energy-saving.

[0048] For the traditional defrosting scheme, defrosting is performed by setting a defrosting period. Compared with the traditional defrosting period, the defrosting start control of the embodiment is more timely, the number of times of starting the heating device and stopping the compressor can be reduced, and the refrigeration function does not need to stop working when defrosting.

[0049] Embodiment 2

[0050] According to the embodiment of the present application, a defrosting method of a dual-compressor system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown.

[0051] Figure 3 is a flowchart of a defrosting method of a dual-compressor system according to an embodiment of the present application, which is applied to the dual-compressor system described above, as shown in Figure 3 , the method comprises the following steps:

[0052] Step S301, detecting the weight change amount of the first evaporator and the weight change amount of the second evaporator within a preset time period;

[0053] Step S302, triggering the switching between the first pipeline and the first branch according to the weight change amount of the first evaporator; triggering the switching between the second pipeline and the second branch according to the weight change amount of the second evaporator.

[0054] The embodiment can select the working start state of the first compressor system and the second compressor system according to the icing state of the evaporator, and control the selection of the refrigerant flow path. Thus, the function configuration is reasonably used, the defrosting control is more accurate and timely, and the energy consumption is reduced; the compressor does not stop working while defrosting by using waste heat, and the refrigeration function works normally; the number of compressor stop is reduced, the influence of the heater heat radiation on the temperature of the compartment is reduced, the fluctuation range of the temperature of the compartment is reduced, and it is more beneficial to food preservation and storage.

[0055] The technical solutions of triggering the switching between the first pipeline and the first branch according to the weight change amount of the first evaporator, and triggering the switching between the second pipeline and the second branch according to the weight change amount of the second evaporator will be introduced below.

[0056] 1) Determine the icing state of the first evaporator according to the weight change amount of the first evaporator; wherein, the interval range of the weight change amount corresponding to different icing states is preset; determine the corresponding refrigerant flow path according to the icing state, and execute the switching between the first pipeline and the first branch. Thus, the defrosting control is more accurate and timely, and the energy consumption is reduced.

[0057] It should be noted that the icing state at least includes: no ice state, little ice state, and much ice state; the above three icing states can be further subdivided, for example, the little ice state can be subdivided into a small amount of ice and a medium amount of ice, but the refrigerant flow paths corresponding to the two states after subdivision are consistent, and the control operations adopted are also consistent. The specific solutions of determining the corresponding refrigerant flow path to execute the switching between the first pipeline and the first branch according to the icing state will be introduced below:

[0058] If it is ice-free state, control the first compressor to work normally, the first heater to be closed, the first reversing valve to be closed, and determine the corresponding refrigerant flow path as the first pipeline;

[0059] If it is little ice state, control the first compressor to work normally, the first heater to be closed, the first reversing valve to be opened, and determine the corresponding refrigerant flow path as the first branch;

[0060] If it is much ice state, control the first compressor to be closed, the first heater to be opened, and the first reversing valve to be closed, and determine the corresponding refrigerant flow path as the first pipeline; after that, the weight change amount of the first evaporator is detected in real time; when the weight change amount corresponds to ice-free state, the defrosting mode is exited, and the first compressor is controlled to work normally.

[0061] Based on the weight change amount of the evaporator being in different interval ranges, the icing state of the evaporator can be determined, and accordingly the specific refrigerant flow path of the double-compressor system can be determined, for example, the selection of the first pipeline and the first branch, or the selection of the second pipeline and the second branch. Thus, waste heat recovery can be effectively realized, and the compressor can work normally without stopping while defrosting with waste heat.

[0062] 2) Determine the icing state of the second evaporator according to the weight change amount of the second evaporator; wherein interval ranges of weight change amounts corresponding to different icing states are preset; determine the corresponding refrigerant flow path according to the icing state, and perform switching between the second pipeline and the second branch. Thus, the defrosting control is more accurate and timely, and the energy consumption is reduced.

[0063] It should be noted that the icing state at least includes: ice-free state, little ice state, and much ice state; the above three icing states can be further subdivided, for example, the little ice state can be subdivided into little ice and medium ice, but the refrigerant flow paths corresponding to the two states after subdivision are consistent, and the control operations taken are also consistent. The specific scheme of determining the corresponding refrigerant flow path to perform switching between the second pipeline and the second branch according to the icing state is described below:

[0064] If it is ice-free state, control the second compressor to work normally, the second heater to be closed, and the second reversing valve to be closed, and determine the corresponding refrigerant flow path as the second pipeline;

[0065] If it is little ice state, control the second compressor to work normally, the second heater to be closed, and the second reversing valve to be opened, and determine the corresponding refrigerant flow path as the second branch;

[0066] If it is the multi-ice state, the second compressor is controlled to be closed, the second heater is controlled to be opened, the second reversing valve is controlled to be closed, and the corresponding refrigerant flow path is determined to be the second pipeline; after that, the weight change amount of the second evaporator is detected in real time; when the weight change amount corresponds to the no-ice state, the defrosting mode is exited, and the second compressor is controlled to work normally.

[0067] Based on the weight change amount of the evaporator being in different interval ranges, the icing state of the evaporator can be judged, and accordingly the specific refrigerant flow path of the double-compressor system can be determined, for example, the selection of the first pipeline and the first branch, or the selection of the second pipeline and the second branch. Thus, the waste heat can be effectively recovered, and the compressor can work normally without stopping and the refrigeration function can work normally while defrosting by using the waste heat.

[0068] The embodiment uses the weight change amount of the evaporator as a signal, adds a node for introducing waste heat defrosting, uses a pressure sensor to monitor the weight change amount of the evaporator, and accurately and timely controls the opening and closing of the waste heat introduction branch and the opening and closing of the heater, so that the defrosting control is more accurate and sensitive. The waste heat of the condenser is recovered, which is more energy-saving, and at the same time, the refrigeration function can work normally while defrosting. Defrosting by using the waste heat can reduce the number of times of stopping the compressor and opening the heating device, and reduce the temperature change amplitude of the chamber caused by the heating device defrosting and the refrigeration stopping, which is beneficial to the preservation and storage of food.

[0069] Embodiment 3

[0070] Figure 4 is a detailed flowchart of the defrosting method of the double-compressor system according to the embodiment of the present application, as shown in Figure 4 The method comprises the following steps:

[0071] Step 1, when the first and second compressor systems work simultaneously, the weight change amounts ΔG1 and ΔG2 of the first and second evaporators are detected by using a pressure sensor, specifically, ΔG1 and ΔG2 can be extracted every N minutes. According to the weight change amounts, the icing state of the evaporator can be divided into: no-ice state, little-ice state, and multi-ice state. The embodiment is further divided into: no-ice, little ice, medium ice, and large ice, and the demarcation points of the weight change amounts between the states can be set to M0, M1, and M2 respectively.

[0072] Step 2, when 0≤ΔG1≤M0, the state is regarded as no-ice, the first compressor works normally, the heating device is closed, the first reversing valve is closed, and the refrigerant flows through the A channel;

[0073] When M0≤ΔG1≤M1, the state is regarded as little ice, the first compressor works normally, the heating device is closed, the first reversing valve is opened, a part of the waste heat is introduced to defrost, and the refrigerant flows through the B channel;

[0074] When M1≤ΔG1≤M2, the state is considered as medium ice, the first compressor works normally, the heating device is closed, the first reversing valve is opened, a part of waste heat is introduced to defrost, and the refrigerant flows through the B passage;

[0075] When ΔG1≥M2, the state is considered as large ice, the first compressor is closed, the first reversing valve is closed, the refrigerant flows through the A passage, the heating device is opened, and the fast defrosting mode is started; after that, the pressure sensor monitors the weight of the first evaporator in real time, when ΔG1≤M0, the defrosting is finished, the defrosting is exited, and the first compressor is restarted.

[0076] Step 3, when 0≤ΔG2≤M0, the state is considered as no ice, the second compressor works normally, the heating device is closed, the second reversing valve is closed, and the refrigerant flows through the C passage;

[0077] When M0≤ΔG2≤M1, the state is considered as little ice, the second compressor works normally, the heating device is closed, the second reversing valve is opened, a part of waste heat is introduced to defrost, and the refrigerant flows through the D passage;

[0078] When M1≤ΔG2≤M2, the state is considered as medium ice, the second compressor works normally, the heating device is closed, the second reversing valve is opened, a part of waste heat is introduced to defrost, and the refrigerant flows through the D passage;

[0079] When ΔG2≥M2, the state is considered as large ice, the second compressor is closed, the second reversing valve is closed, the refrigerant flows through the C passage, the heating device is opened, and the fast defrosting mode is started; after that, the pressure sensor monitors the weight of the second evaporator in real time, when ΔG2≤M0, the defrosting is finished, the defrosting is exited, and the second compressor is restarted.

[0080] The embodiment introduces the defrosting control method when the first and second compressor systems work, and Table 1 shows the corresponding condenser and refrigerant flow passage branch when the weight change amount ΔG1 and ΔG2 of the first and second evaporators are in different interval ranges.

[0081]

[0082] When the refrigeration system works for a long time, the temperature difference between the interval room temperature and the set temperature is small, the second compressor system stops working, the refrigerant flows through the C passage, and only the first compressor system works, and the refrigerant flow passage control is executed according to the first evaporator weight change amount ΔG1.

[0083] When the chamber is put into food that produces less water vapor, the chamber humidity is smaller, the frost rate on the evaporator is slower, the frost can be defrosted by the heat introduced through the condenser, the opening of the heating device and the closing of the compressor are greatly reduced, and the refrigeration function can work normally when defrosting; when the chamber is put into food that produces more water vapor, the chamber humidity is larger, the frost rate on the evaporator is too slow to defrost the frost block in time through the heat introduced through the condenser, the weight of the evaporator increases rapidly, and the evaporator is quickly defrosted through the heating device. The device can reduce the opening times of the heating device for defrosting, reduce the influence of the heating device heat radiation on the temperature of the chamber, introduce part of the condenser waste heat for defrosting, reduce the working energy consumption, and be more energy-saving. The opening and closing times of the compressor can be reduced, the downtime of the refrigeration system can be reduced, the temperature fluctuation range of the chamber can be reduced, and the preservation and storage of food are beneficial.

[0084] Embodiment 4

[0085] Corresponding to Figure 3 The defrosting method of the double-compressor system is introduced, and the embodiment provides a defrosting device of a double-compressor system, as shown in Figure 5 The structure block diagram of the defrosting device of the double-compressor system, the device comprises:

[0086] The detection module 10 is used for detecting the weight change amount of the first evaporator and the weight change amount of the second evaporator in a preset time period;

[0087] The switching module 20 is connected to the detection module 10, and is used for triggering the switching between the first pipeline and the first branch according to the weight change amount of the first evaporator, and triggering the switching between the second pipeline and the second branch according to the weight change amount of the second evaporator.

[0088] In specific application, the defrosting device of the double-compressor system can realize Figure 3 The defrosting scheme of the double-compressor system is introduced. The defrosting scheme has been described in detail before, and will not be repeated here.

[0089] Embodiment 5

[0090] The embodiment provides an electronic device for a defrosting method of a double-compressor system, the electronic device comprises at least one processor and a memory connected with the at least one processor in communication; and wherein

[0091] The memory stores instructions executable by the one processor, and the instructions are executed by the at least one processor to enable the at least one processor to: detect the weight change amount of the first evaporator and the weight change amount of the second evaporator within a preset time period; trigger switching between the first pipeline and the first branch according to the weight change amount of the first evaporator; and trigger switching between the second pipeline and the second branch according to the weight change amount of the second evaporator. Thus, the defrosting can be performed by using waste heat, the compressor does not stop, the refrigeration function works normally, the number of compressor stoppages is reduced, the influence of heater heat radiation on the temperature of the intermediate chamber is reduced, the fluctuation range of the temperature of the intermediate chamber is reduced, and food preservation and storage are more favorable.

[0092] Embodiment 6

[0093] The embodiment of the present application provides a software for executing the technical solutions described in the above embodiments and preferred embodiments.

[0094] The embodiment of the present application provides a nonvolatile computer storage medium, which stores computer executable instructions, and the computer executable instructions can execute the defrosting method of the double-compressor system in any method embodiment.

[0095] The storage medium stores the above software, and the storage medium includes but is not limited to an optical disc, a floppy disk, a hard disk, a rewritable memory and the like.

[0096] The above embodiment numbers of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0097] In the above embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0098] In the several embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. Of course, the device embodiment described above is only schematic. For example, the division of the units can be a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, unit or module, and can be electrical or other forms.

[0099] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e. may be located in one place, or may be distributed to multiple units. Part or all of the units may be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0100] In addition, the functional units in various embodiments of the application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0101] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the application essentially or the part of the prior art that contributes to the technical solutions or all or part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the method described in various embodiments of the application. The foregoing storage medium includes: a U disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0102] The above product can execute the method provided by the embodiments of the application, has the corresponding function modules and beneficial effects of executing the method. Technical details not described in detail in the embodiments can be referred to the method provided by the embodiments of the application.

[0103] The electronic device of the embodiments of the application exists in various forms, including but not limited to:

[0104] (1) Mobile communication device: This kind of device is characterized by having mobile communication function, and providing voice and data communication as the main target. This kind of terminal includes: smart phone (such as iPhone), multimedia phone, functional phone, and low-end phone, etc.

[0105] (2) Ultra-mobile personal computer device: This kind of device belongs to the category of personal computer, has computing and processing function, and generally has mobile Internet feature. This kind of terminal includes: PDA, MID and UMPC device, such as iPad.

[0106] (3) Portable entertainment devices: This kind of device can display and play multimedia content. This kind of device includes: audio and video players (such as iPod), handheld game consoles, electronic books, and smart toys and portable car navigation devices.

[0107] (4) Server: A device providing computing services, the server is composed of a processor, a hard disk, a memory, a device bus, etc., and the server is similar to a general computer architecture, but since it needs to provide high-reliable services, it has higher requirements in processing capability, stability, reliability, security, scalability, manageability, etc.

[0108] (5) Other electronic devices with data interaction functions, such as televisions, car-mounted large screens, etc.

[0109] The device embodiments described above are only schematic, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiments.

[0110] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A dual-compressor system, characterized by, The double-compressor system comprises a first compressor system and a second compressor system, both of which share a condenser, the first compressor system comprises a first capillary tube, a first evaporator and a first compressor connected in sequence, and the second compressor system comprises a second capillary tube, a second evaporator and a second compressor connected in sequence; The first compressor and the second compressor are connected to the front end of the condenser through a first pipeline, and the first capillary tube and the second capillary tube are connected to the rear end of the condenser through a second pipeline; A first reversing valve is arranged on the first pipeline, and a first branch is connected to the first evaporator between the first reversing valve and the front end of the condenser; the first reversing valve is used for controlling switching between the first pipeline and the first branch; A second reversing valve is arranged on the second pipeline, and a second branch is connected to the second evaporator between the second reversing valve and the rear end of the condenser; the second reversing valve is used for controlling switching between the second pipeline and the second branch.

2. The double-compressor system according to claim 1, wherein A pressure sensor is arranged on each of the first evaporator and the second evaporator, and is used for detecting a weight change amount of the first evaporator and a weight change amount of the second evaporator; The weight change amount of the first evaporator is used for determining switching between the first pipeline and the first branch, and the weight change amount of the second evaporator is used for determining switching between the second pipeline and the second branch.

3. The double-compressor system according to claim 1, wherein A first heater is arranged on the first evaporator, and is used for defrosting; A second heater is arranged on the second evaporator, and is used for defrosting.

4. The dual-compressor system of claim 1, wherein, The double-compressor system further comprises: A one-way valve arranged on the second pipeline, and used for preventing refrigerant backflow when the second pipeline and the second branch are switched.

5. The dual-compressor system of claim 1, wherein, The double-compressor system further comprises: A flow dividing valve arranged on the second pipeline, and used for dividing refrigerant flowing out of the rear end of the condenser into the first capillary tube of the first compressor system and the second capillary tube of the second compressor system.

6. A defrosting method of a dual-compressor system, applied to the dual-compressor system according to any one of claims 1 to 5, characterized by, The method comprises: Detecting a weight change amount of the first evaporator and a weight change amount of the second evaporator within a preset time period; Triggering switching between the first pipeline and the first branch according to the weight change amount of the first evaporator; Triggering switching between the second pipeline and the second branch according to the weight change amount of the second evaporator.

7. The method of claim 6, wherein, Triggering switching between the first pipeline and the first branch according to the weight change amount of the first evaporator comprises: Determining an icing state of the first evaporator according to the weight change amount of the first evaporator; wherein, preset interval ranges of weight change amounts corresponding to different icing states are provided; Determining a corresponding refrigerant flow path according to the icing state, and performing switching between the first pipeline and the first branch.

8. The method of claim 7, wherein, The icing state at least comprises: no-icing state, little-icing state and much-icing state. According to the icing state, a corresponding refrigerant flow path is determined, and switching between the first pipeline and the first branch is performed, including: If it is an ice-free state, the first compressor is controlled to work normally, the first heater is closed, the first reversing valve is closed, and a corresponding refrigerant flow path is determined as the first pipeline; If it is a little ice state, the first compressor is controlled to work normally, the first heater is closed, the first reversing valve is opened, and a corresponding refrigerant flow path is determined as the first branch; If it is a lot of ice state, the first compressor is controlled to be closed, the first heater is opened, the first reversing valve is closed, and a corresponding refrigerant flow path is determined as the first pipeline.

9. The method of claim 8, wherein, If it is a lot of ice state, the first compressor is controlled to be closed, the first heater is opened, the first reversing valve is closed, and a corresponding refrigerant flow path is determined as the first pipeline, and the method further includes: Real-time detection of the weight change amount of the first evaporator; When the weight change amount corresponds to an ice-free state, the defrosting mode is exited, and the first compressor is controlled to work normally.

10. The method of claim 6, wherein, According to the weight change amount of the second evaporator, switching between the second pipeline and the second branch is triggered, including: According to the weight change amount of the second evaporator, the icing state of the second evaporator is determined; wherein there are preset interval ranges of weight change amounts corresponding to different icing states; According to the icing state, a corresponding refrigerant flow path is determined, and switching between the second pipeline and the second branch is performed.

11. The method of claim 10, wherein, The icing state at least includes: ice-free state, little ice state, and a lot of ice state; According to the icing state, a corresponding refrigerant flow path is determined, and switching between the second pipeline and the second branch is performed, including: If it is an ice-free state, the second compressor is controlled to work normally, the second heater is closed, the second reversing valve is closed, and a corresponding refrigerant flow path is determined as the second pipeline; If it is a little ice state, the second compressor is controlled to work normally, the second heater is closed, the second reversing valve is opened, and a corresponding refrigerant flow path is determined as the second branch; If it is a lot of ice state, the second compressor is controlled to be closed, the second heater is opened, the second reversing valve is closed, and a corresponding refrigerant flow path is determined as the second pipeline.

12. The method of claim 11, wherein, If it is a lot of ice state, the second compressor is controlled to be closed, the second heater is opened, the second reversing valve is closed, and a corresponding refrigerant flow path is determined as the second pipeline, and the method further includes: Real-time detection of the weight change amount of the second evaporator; When the weight change amount corresponds to an ice-free state, the defrosting mode is exited, and the second compressor is controlled to work normally.

13. A defrosting device of a dual-compressor system according to any one of claims 1 to 5, characterized by The device includes: A detection module for detecting the weight change amount of the first evaporator and the weight change amount of the second evaporator within a preset time period; A switching module for triggering switching between the first pipeline and the first branch according to the weight change amount of the first evaporator, and triggering switching between the second pipeline and the second branch according to the weight change amount of the second evaporator.

14. A refrigeration appliance characterized in that, The refrigeration equipment includes the double-compressor system of any one of claims 1 to 5.

15. A computer readable storage medium having stored thereon a computer program, characterized in that, The program, when executed by the processor, implements the method of any one of claims 6 to 12.

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