Refrigeration device and pressure maintenance control method and control device therefor

Abstract

The application discloses a refrigeration equipment and a pressure maintaining control method and a control device thereof. The pressure maintaining control method comprises the following steps: obtaining a target time when a starting signal of a compressor is received; controlling a first switching component to connect a condenser and a first evaporator, and maintaining operation for the target time; and then starting the compressor. In the application, before the compressor is restarted, the control device first obtains the target time, and then controls the first switching component to connect the condenser and the first evaporator, so that the refrigerant in the condenser after temperature drop during shutdown enters the first evaporator to precool the first evaporator, which helps to improve the initial refrigeration effect of the first evaporator and reduce the energy consumption of the first evaporator, and helps to reduce the inflow of the refrigerant at the condenser into a second evaporator.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, specifically to a refrigeration equipment and its pressure holding control method and control device. Background Technology

[0002] Existing refrigeration equipment, taking refrigerators as an example, generally forms a refrigeration circuit that flows sequentially through the compressor, condenser, refrigerator evaporator, freezer evaporator, and compressor. When cooling is requested, the refrigerant in the condenser is in a high-temperature, high-pressure state, while the refrigerant in the evaporator is in a low-temperature, low-pressure state. When cooling is not requested, the refrigerant in the condenser flows to the refrigerator and freezer evaporators. Due to the lack of heat recovery, the temperature of the refrigerant entering the freezer evaporator is higher than the freezing temperature of the freezer, causing the freezer to heat up. At the same time, the pressure in the condenser decreases, and the liquid refrigerant in the condenser may re-evaporate and absorb heat from the environment, increasing the refrigerator's heat load. Furthermore, after restarting, the system needs to re-establish the pressure difference between the condenser and evaporator, leading to increased energy consumption. Summary of the Invention

[0003] The main objective of this invention is to propose a refrigeration equipment and its pressure-holding control method and device, which aims to solve the problem that when the traditional refrigeration cycle stops, the refrigerant in the condenser flows to the evaporator, resulting in increased refrigerator energy consumption.

[0004] To achieve the above objectives, the present invention proposes a pressure-holding control method for a refrigeration device. The refrigeration device includes a compressor, a condenser, a first evaporator, and a second evaporator, which are sequentially connected via piping to form a refrigeration circuit. The refrigeration temperature of the first evaporator is higher than that of the second evaporator. The refrigeration device further includes a first switching component disposed between the condenser and the first evaporator, which controls the on / off connection between the condenser and the first evaporator. The pressure-holding control method for the refrigeration device includes:

[0005] Upon receiving the compressor start-up signal, acquire the target time;

[0006] After controlling the first switching component to connect the condenser and the first evaporator and maintaining operation for the target time, the compressor is then started.

[0007] Optionally, before the step of obtaining the target time upon receiving the compressor's start-up signal, the method further includes:

[0008] Upon receiving a shutdown signal from the compressor, the first switching component is controlled to disconnect the connection between the condenser and the first evaporator.

[0009] Optionally, the step of obtaining the target time upon receiving the compressor start-up signal includes:

[0010] Upon receiving the compressor start-up signal, obtain the compressor start-up speed;

[0011] Based on the start-up speed, obtain the target pressure difference that matches the start-up speed;

[0012] Obtain the preset pressure difference threshold between the intake and exhaust sides of the compressor;

[0013] The target time is determined based on the pressure difference threshold and the target pressure difference.

[0014] Optionally, the step of controlling the first switching component to connect the condenser and the first evaporator, and maintaining operation for the target time, before controlling the compressor to start includes:

[0015] Obtain the current pressure difference between the suction and discharge sides of the compressor;

[0016] When the current pressure difference is not greater than the pressure difference threshold, the first switching component is controlled to connect the condenser and the first evaporator, and after maintaining the operation for the target time, the compressor is controlled to start.

[0017] Optionally, the step of obtaining the current pressure difference between the suction side and the discharge side of the compressor includes:

[0018] Obtain the compressor's suction pressure and discharge pressure;

[0019] Calculate the current pressure difference based on the intake pressure and the exhaust pressure.

[0020] Optionally, the step of obtaining the compressor's suction pressure and discharge pressure includes:

[0021] Obtain the chamber temperature and ambient temperature inside and outside the chamber where the second evaporator is located;

[0022] The compressor's suction pressure is determined based on the chamber temperature.

[0023] The compressor's discharge pressure is determined based on the ambient temperature.

[0024] Optionally, the refrigeration equipment further includes a plurality of throttling components arranged in parallel between the condenser and the first evaporator to define a plurality of throttling paths, each of which has a different throttling capacity, and the first switching component can selectively switch on any of the throttling paths;

[0025] The step of obtaining the target time upon receiving the compressor start-up signal includes:

[0026] Upon receiving the compressor start-up signal, the target throttling path is obtained from multiple throttling paths;

[0027] Based on the target throttling path, determine the target time that matches the target throttling path.

[0028] Optionally, the refrigeration equipment further includes a connecting branch and a second switching component. The input end of the connecting branch is connected between the first evaporator and the second evaporator, and the output end of the connecting branch is connected between the second evaporator and the compressor. The second switching component is used to control the on / off state of the connecting branch.

[0029] The step of controlling the first switching component to connect the condenser and the first evaporator, and maintaining operation for the target time, and then controlling the compressor to start includes:

[0030] After controlling the first switching component to connect the condenser and the first evaporator, and controlling the second switching component to connect the connecting branch, and maintaining operation for the target time, the compressor is then started.

[0031] In addition, to achieve the above objectives, the present invention also provides a control device, including a memory, a processor, and a pressure holding control program for a refrigeration device stored in the memory and executable on the processor, the pressure holding control program for the refrigeration device being configured to implement the steps of the pressure holding control method for the refrigeration device as described above.

[0032] Furthermore, to achieve the above objectives, the present invention also provides a refrigeration device, comprising:

[0033] A refrigeration system includes a compressor, a condenser, a first evaporator, and a second evaporator, which are sequentially connected via piping to form a refrigeration circuit. The refrigeration temperature of the first evaporator is higher than that of the second evaporator. The refrigeration system further includes a first switching component disposed between the condenser and the first evaporator, which controls the on / off connection between the condenser and the first evaporator.

[0034] The control device described above is electrically connected to the compressor and the switching component, respectively.

[0035] Optionally, the refrigeration circuit further includes a plurality of throttling components arranged in parallel between the condenser and the first evaporator to define a plurality of throttling paths, each of which has a different throttling capacity, and the first switching component can selectively activate any of the throttling paths.

[0036] Optionally, the refrigeration equipment further includes a connecting branch and a second switching component. The input end of the connecting branch is connected between the first evaporator and the second evaporator, and the output end of the connecting branch is connected between the second evaporator and the compressor. The second switching component is used to control the on / off state of the connecting branch.

[0037] In the technical solution provided by this invention, the first switching component cuts off the flow path between the condenser and the first evaporator when the compressor is shut down, which helps maintain the pressure at the condenser and prevents the refrigerant from reabsorbing heat from the environment due to a pressure drop at the condenser. It also reduces the energy consumption required to form a pressure difference between the two sides during the compressor restart process, thus achieving energy saving. Before the compressor restarts, the control device first obtains the target time and then controls the first switching component to connect the condenser and the first evaporator, so that the refrigerant in the condenser, after being cooled down by shutdown, enters the first evaporator to pre-cool it, which helps to improve the initial cooling effect of the first evaporator and reduce the energy consumption of the first evaporator. It also helps to reduce the flow of refrigerant from the condenser into the second evaporator. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0039] Figure 1 A schematic diagram of the structure of the first embodiment of the refrigeration system provided by the present invention;

[0040] Figure 2 A schematic diagram of the structure of a second embodiment of the refrigeration system provided by the present invention;

[0041] Figure 3 A schematic diagram of the third embodiment of the refrigeration system provided by the present invention;

[0042] Figure 4 A schematic diagram of the fourth embodiment of the refrigeration system provided by the present invention;

[0043] Figure 5 A schematic diagram of the fifth embodiment of the refrigeration system provided by the present invention;

[0044] Figure 6 This is a flowchart illustrating the first embodiment of the pressure holding control method for refrigeration equipment in this invention;

[0045] Figure 7 This is a flowchart illustrating the second embodiment of the pressure holding control method for the refrigeration equipment in this invention.

[0046] Figure 8 This is a flowchart illustrating the third embodiment of the pressure holding control method for the refrigeration equipment in this invention.

[0047] Figure 9This is a flowchart illustrating the fourth embodiment of the pressure holding control method for the refrigeration equipment in this invention.

[0048] Figure 10 This is a flowchart illustrating the fifth embodiment of the pressure holding control method for the refrigeration equipment in this invention.

[0049] Figure 11 This is a flowchart illustrating the sixth embodiment of the pressure holding control method for the refrigeration equipment in this invention. (Explanation of reference numerals:)

[0050]

[0051]

[0052] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0054] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0055] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0056] Existing refrigeration equipment, taking refrigerators as an example, generally forms a refrigeration circuit that flows sequentially through the compressor, condenser, refrigerator evaporator, freezer evaporator, and compressor. When cooling is requested, the refrigerant in the condenser is in a high-temperature, high-pressure state, while the refrigerant in the evaporator is in a low-temperature, low-pressure state. When cooling is not requested, the refrigerant in the condenser flows to the refrigerator and freezer evaporators. Due to the lack of heat recovery, the temperature of the refrigerant entering the freezer evaporator is higher than the freezing temperature of the freezer, causing the freezer to heat up. At the same time, the pressure in the condenser decreases, and the liquid refrigerant in the condenser may re-evaporate and absorb heat from the environment, increasing the refrigerator's heat load. Furthermore, after restarting, the system needs to re-establish the pressure difference between the condenser and evaporator, leading to increased energy consumption.

[0057] In view of the above, the present invention provides a refrigeration device, such as a refrigerator, freezer, or air conditioner. For ease of understanding, the following description will use a refrigerator as an example. Please refer to [link to relevant documentation]. Figures 1 to 5 The attached figure shows a specific embodiment of the refrigeration equipment provided by the present invention when it is a refrigerator.

[0058] Please see Figures 1 to 3 The refrigeration equipment provided by the present invention includes a refrigeration system 1 and a control device. The refrigeration system 1 includes a compressor 100, a condenser 200, a first evaporator 310, and a second evaporator 320, which are sequentially connected to form a refrigeration circuit 10 via a pipeline structure 10a. The refrigeration temperature of the first evaporator 310 is greater than that of the second evaporator 320. The refrigeration system 1 also includes a first switching component 400 disposed between the condenser 200 and the first evaporator 310. The first switching component 400 is used to control the on / off state between the condenser 200 and the first evaporator 310. The control device is electrically connected to the compressor 100 and the switching component, respectively.

[0059] In the technical solution provided by this invention, the first switching component 400 cuts off the flow path between the condenser 200 and the first evaporator 310 when the compressor 100 is turned off. This helps maintain the pressure at the condenser 200 and prevents the refrigerant from reabsorbing heat from the environment due to a pressure drop at the condenser 200. It also reduces the energy consumption required to form a pressure difference between the two sides during the compressor 100 restart process, achieving energy saving. When the refrigeration system 1 enters the next operating cycle, the first switching component 400 opens the flow path between the condenser 200 and the first evaporator 310 before the compressor 100 restarts. This allows the refrigerant in the condenser 200, after being cooled down during shutdown, to enter the first evaporator 310 and pre-cool it, which helps improve the initial cooling effect of the first evaporator 310 and reduces its energy consumption. It also reduces the flow of refrigerant from the condenser 200 into the second evaporator 320, preventing the temperature of the compartment where the second evaporator 320 is located from rising and reducing its energy consumption.

[0060] It is understood that the refrigerator is a multi-system refrigerator, and the refrigeration circuit 10 is equipped with multiple evaporators. Specifically, for example, when the refrigerator is provided with at least two of the following compartments: a refrigerator compartment, a freezer compartment, and a variable temperature compartment, the corresponding evaporators are at least two of the following: a refrigerator compartment evaporator, a freezer compartment evaporator, and a variable temperature evaporator.

[0061] Because the required cooling temperatures for the refrigerator compartment, freezer compartment, and variable temperature compartment are different, the cooling temperatures of the evaporators in the refrigerator compartment, freezer compartment, and variable temperature compartment are also different. Therefore, in this embodiment, the plurality of evaporators includes a first evaporator 310 and a second evaporator 320, wherein the cooling temperature of the first evaporator 310 is greater than that of the second evaporator 320. That is, the first evaporator 310 is equivalent to the refrigerator compartment evaporator, and the second evaporator 320 is equivalent to the freezer compartment evaporator.

[0062] When the refrigeration system 1 is applied to different types of refrigeration equipment, the first evaporator 310 and the second evaporator 320 can be connected in any suitable series, parallel, or semi-series / parallel configuration. The first evaporator 310 and the second evaporator 320 can be of the same or different types. The first evaporator 310 and the second evaporator 320 can be any suitable form of evaporator, such as one or more of tube-fin heat exchangers, microchannel heat exchangers, flat tube heat exchangers, shell-and-tube heat exchangers, and plate heat exchangers. Specifically, in one embodiment, the tube-fin heat exchanger and the microchannel heat exchanger can be connected in series / parallel to serve as either the first evaporator 310 or the second evaporator 320.

[0063] It should be noted that the above-mentioned components do not constitute a limitation on the composition of the refrigeration system 1. Depending on actual needs, other components may be connected in series or in parallel on the refrigeration circuit 10. Furthermore, the refrigeration system 1 may also be connected to a bypass or branch at any suitable location on the refrigeration circuit 10, which will not be elaborated here.

[0064] In one embodiment, the refrigeration system 1 further includes a throttling component disposed between the condenser 200 and the first evaporator 310, and / or between the condenser 200 and the second evaporator 320. The throttling component can reduce the pressure and temperature of the refrigerant flowing out of the condenser 200 using a throttling effect, and control the flow rate and superheat / cooling of the refrigerant in the refrigeration circuit 10. The specific form of the throttling component is not limited and can be configured according to the actual needs of the refrigeration system 1. Generally, the throttling component includes capillary tubes, electronic expansion valves, throttling horns, and throttling valves such as manual expansion valves, float regulating valves, and thermostatic expansion valves. Since capillary tubes are widely used in refrigeration equipment such as refrigerators, in the following embodiments, a capillary tube will be used as an example for illustration.

[0065] Different throttling components will have different throttling parameters. For example, when the throttling component is set as a capillary tube in this embodiment, the throttling parameters of the capillary tube can be tube diameter, tube length, number, etc.

[0066] In one embodiment, the refrigeration system 1 further includes a dryer filter 700, which is disposed between the throttling component and the condenser 200. The dryer filter 700 can filter and dehumidify the passing refrigerant, effectively reducing the risk of ice blockage in the refrigeration circuit 10. This design does not limit the specific form of the dryer filter 700; the specifications of the dryer filter 700 can be adjusted according to the actual needs of the refrigeration system 1. The specifications of the dryer filter 700 include dimensions such as inner diameter and outer diameter, as well as the types of internal components such as filter bowls, mesh cloth, and molecular sieves.

[0067] Based on the above-mentioned refrigeration circuit 10, the compressor 100 compresses the gaseous refrigerant into a high-temperature, high-pressure gaseous state and sends it to the condenser 200 for cooling. After being cooled by the condenser 200, the refrigerant becomes a medium-temperature, high-pressure liquid and enters the dryer filter 700 for filtration and dehumidification. The medium-temperature liquid refrigerant is throttled and depressurized by the throttling component, forming a low-temperature, low-pressure gas-liquid mixture. After passing through the first evaporator 310 / second evaporator 320, it absorbs heat from the air and vaporizes, becoming a gaseous state. Finally, it returns to the compressor 100 to continue compression and continues the cycle for refrigeration.

[0068] In one embodiment, the refrigeration circuit 10 includes a first flow path 11 and a second flow path 12, the input ends of the first flow path 11 and the second flow path 12 are connected, the first evaporator 310 is disposed in the first flow path 11, and the second evaporator 320 is disposed in the second flow path 12; the refrigeration system 1 further includes at least two throttling components, the two throttling components being a first throttling component 510 disposed in the first flow path 11 and a second throttling component 520 disposed in the second flow path 12.

[0069] Specifically, the first throttling component 510 and the second throttling component 520 can be configured as one or more, and the types, specifications, etc. of the multiple first throttling components 510 and / or the multiple second throttling components 520 can be configured to be the same or at least partially different.

[0070] Furthermore, the output end of the first flow path 11 is connected between the second evaporator 320 and the second throttling component 520, so that the refrigerant flowing out of the condenser 200 can enter the second evaporator 320 after passing through the first flow path 11, or the refrigerant flowing out of the condenser 200 can also enter the second evaporator 320 after passing through the second throttling component 520 in the second flow path 12.

[0071] Of course, in one embodiment, the output end of the second flow path 12 may also be connected between the first evaporator 310 and the first throttling component 510.

[0072] Furthermore, in one embodiment, the outputs of the first flow path 11 and the second flow path 12 are connected. That is, the branch containing the first evaporator 310 and the first throttling component 510 is connected in parallel with the branch containing the second evaporator 320 and the second throttling component 520.

[0073] In view of the above, when the refrigeration circuit 10 includes a first flow path 11 and a second flow path 12, the input ends of the first flow path 11 and the second flow path 12 are connected, the first evaporator 310 is disposed in the first flow path 11, and the second evaporator 320 is disposed in the second flow path 12, the first switching component 400 is disposed at the input ends of the first flow path 11 and the second flow path 12 to selectively conduct the first flow path 11 and / or the second flow path 12.

[0074] It is understood that when the first evaporator 310 and the second evaporator 320 are connected in series, the first switching component 400 is a switching valve. When the switching valve is open, the flow path between the condenser 200 and the first evaporator 310 is connected; when the switching valve is closed, the flow path between the condenser 200 and the first evaporator 310 is disconnected. When the first evaporator 310 and the second evaporator 320 are connected in parallel, the first switching component 400 can be configured as a reversing valve. The reversing valve is located at the same input end of the branch where the first evaporator 310 is located and the branch where the second evaporator 320 is located, and can switch the refrigerant flowing out of the condenser 200 to the first evaporator 310 and / or the second evaporator 320.

[0075] Please see Figure 3 The refrigeration system 1 further includes a sensing component, which includes an intake-side sensor 810 and an exhaust-side sensor 820 respectively disposed on the intake and exhaust sides of the compressor 100. Specifically, the intake-side sensor 810 and the exhaust-side sensor 820 can be pressure sensors used to sense the pressure on the intake and exhaust sides of the compressor 100.

[0076] In addition, please see Figure 4 In one embodiment, the refrigeration circuit 10 further includes a plurality of throttling components arranged in parallel between the condenser 200 and the first evaporator 310 to define a plurality of throttling paths, each of which has a different throttling capacity, and the first switching component 400 can selectively switch on any of the throttling paths.

[0077] Among the multiple throttling paths, at least a portion of the throttling paths are configured with different throttling capacities, that is, the throttling capacities between each pair are set differently, so that the refrigerant flowing out of the condenser 200 can undergo different degrees of throttling and pressure reduction when flowing through different throttling paths, thereby obtaining refrigerants with different flow rates and different temperatures.

[0078] Of course, among the multiple throttling paths, a number of throttling paths may be configured to have the same throttling capacity, so that any throttling path among the several throttling paths with the same throttling capacity can be enabled or used as a backup, so that when a throttling path with the same throttling capacity fails, the remaining throttling path can be enabled to ensure the normal operation of the refrigeration system 1.

[0079] The throttling capacity of the throttling path can generally be reflected by the throttling parameters of the throttling components set on the throttling path: each throttling path can be equipped with one or more throttling components. When multiple throttling components are set on at least one throttling path, it can be understood that the throttling components can be connected in series or in series with each other; the throttling parameters of each throttling component can be set to be the same or at least partially different; the types of each throttling component can be set to be the same or at least partially different.

[0080] Further, in one embodiment, the refrigeration circuit 10 has multiple throttling branches 13 connected in parallel on the first flow path 11 and / or the second flow path 12. For ease of understanding, in the following embodiments, it is taken that multiple throttling branches 13 are arranged in the first flow path 11. That is, the input end of each throttling branch 13 is connected to the output end of the condenser 200, and the output end of each throttling branch 13 is connected to the input end of the first evaporator 310. Each throttling branch 13 is provided with at least one first throttling component 510; wherein at least one throttling branch 13 defines a throttling path. That is, when the refrigeration system 1 is operating normally, the refrigerant flowing out of the condenser 200 can directly enter the first evaporator 310 after flowing through one throttling branch 13; or, the refrigerant flowing out of the condenser 200 can enter the first evaporator 310 after flowing through at least two throttling branches 13 in sequence.

[0081] Based on the above, the throttling capacity of each throttling branch 13 can be configured differently. That is, when each throttling branch 13 is provided with one first throttling component 510, the throttling parameters of each first throttling component 510 are different from each other. When each throttling branch 13 is provided with multiple first throttling components 510, by arbitrarily combining different numbers, different connection methods, different types and / or different throttling parameters of first throttling components 510 on each throttling branch 13, the overall throttling capacity of each throttling branch 13 can be made different.

[0082] In addition, please see Figure 5 In one embodiment, the refrigeration equipment further includes a connecting branch 610 and a second switching component 620. The input end of the connecting branch 610 is connected between the first evaporator 310 and the second evaporator 320, and the output end of the connecting branch 610 is connected between the second evaporator 320 and the compressor 100. The second switching component 620 is used to control the on / off state of the connecting branch 610.

[0083] Specifically, the second switching component 620 can be a single unit, such as a multi-way reversing valve, which is located at the connection between the first evaporator 310, the connecting branch 610, and the second evaporator 320, and can switch the refrigerant flowing out of the first evaporator 310 to either the connecting branch 610 or the second evaporator 320. Alternatively, the second switching component 620 can be multiple units. For example, the second switching component 620 is a switching valve, which is respectively installed on the output flow path of the first evaporator 310, the input flow path of the second evaporator 320, and the connecting branch 610. When the two switching valves on the output flow path of the first evaporator 310 and the input flow path of the second evaporator 320 are opened simultaneously, and the switching valve on the connecting branch 610 is closed, the first evaporator 310 is connected to the second evaporator 320; when the two switching valves on the output flow path of the first evaporator 310 and the connecting branch 610 are opened simultaneously, and the switching valve on the input flow path of the second evaporator 320 is closed, the first evaporator 310 is connected to the connecting branch 610.

[0084] Furthermore, in this embodiment, the control device may include: a processor, such as a central processing unit (CPU), a communication bus, a user interface, a network interface, and a memory. The communication bus is used to implement communication between at least some of the aforementioned components. The user interface may include a display screen, an input unit such as a keyboard, and optionally, a standard wired interface or a wireless interface. The network interface may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk storage device. The memory may also optionally be a storage device independent of the aforementioned processor.

[0085] Those skilled in the art will understand that the above structure does not constitute a limitation on the control device, and may include more or fewer components, or combine certain components, or have different component arrangements.

[0086] In this embodiment, the memory, which serves as a storage medium, may include an operating system, a network communication module, a user interface module, and a pressure-holding control program for the refrigeration equipment.

[0087] It should be noted that the control device is a control component used to realize the pressure holding control function of the refrigeration equipment. The refrigeration equipment has a control system. The control device can be electrically connected to the main body of the control system as one of the components of the control system, or the control system can directly constitute the control device.

[0088] Furthermore, based on the aforementioned structural features of refrigeration equipment, this invention also provides a pressure-holding control method for refrigeration equipment, attached... Figures 6 to 11 This is a specific embodiment of the pressure holding control method for the refrigeration equipment provided by the present invention.

[0089] Please see Figure 6 In a first embodiment of the pressure holding control method for a refrigeration device provided by the present invention, the refrigeration device includes a compressor 100, a condenser 200, a first evaporator 310, and a second evaporator 320 connected sequentially through a pipeline structure 10a to form a refrigeration circuit 10. The refrigeration temperature of the first evaporator 310 is greater than that of the second evaporator 320. The refrigeration system 1 further includes a first switching component 400 disposed between the condenser 200 and the first evaporator 310, the first switching component 400 being used to control the on / off connection between the condenser 200 and the first evaporator 310. The pressure holding control method for the refrigeration device includes:

[0090] Step S200: Upon receiving the start-up signal from compressor 100, acquire the target time;

[0091] In this embodiment, the power-on signal can be triggered in various ways. For example, the refrigeration device further includes a triggering device, which can be various mechanical buttons or virtual buttons. The power-on signal can be a signal generated when the user operates the touch screen of the refrigeration device, a signal when the refrigeration device recognizes the user's voice, or a signal emitted by the user based on the operating interface of the mobile terminal. Of course, the power-on signal can be preset by the refrigeration device, for example, adaptively triggered according to the operating status or environmental parameters of the refrigeration system 1.

[0092] Please refer to the following explanation: Figure 7 In the second embodiment of the pressure holding control method for the refrigeration equipment provided by the present invention, before step S200: obtaining the target time upon receiving the start-up signal of the compressor 100, the method further includes:

[0093] Step S100: Upon receiving a shutdown signal from the compressor 100, control the first switching component 400 to disconnect the connection between the condenser 200 and the first evaporator 310.

[0094] It is understood that when the refrigeration system 1 finishes the previous operating cycle and the compressor 100 is determined to be shut down, the control device first controls the first switching component 400 to disconnect the connection between the condenser 200 and the first evaporator 310, so as to prevent the high-temperature and high-pressure refrigerant in the condenser 200 from directly entering the first evaporator 310, causing the temperature of the compartment where the first evaporator 310 is located to rise, and causing the pressure at the condenser 200 to drop so that the refrigerant reabsorbs heat from the environment.

[0095] When it is determined that the compressor 100 currently needs to be turned on, the control device first obtains the target time. There are several ways to obtain the target time:

[0096] In one embodiment, step S200: obtaining the target time upon receiving the start-up signal of the compressor 100 specifically includes:

[0097] Step S231: Upon receiving the start-up signal of compressor 100, obtain the specification parameters of the refrigeration equipment;

[0098] Step S234: Determine the target time based on the specified parameters and the preset matching relationship between the specified parameters and the target time.

[0099] It is understandable that the specific structure and cooling capacity of the refrigeration equipment will vary depending on its specifications. Before the refrigeration equipment leaves the factory, a target time scheme can be pre-configured for each specification parameter or each group of specification parameters. It should be noted that the target time scheme can be an exact value or range of values ​​for a specific target time, or it can be a time matching scheme associated with the operating mode of the refrigeration equipment. For example, when the refrigeration equipment is in the first operating mode, the target time can be selected as the first time; when the refrigeration equipment is in the second operating mode, the target time can be selected as the second time, and so on.

[0100] Furthermore, the target time that matches the specified parameters can be measurement data obtained by technicians based on multiple effective and reliable tests, or it can be empirical data, without limitation.

[0101] Or please see Figure 8 In the third embodiment of the pressure holding control method for refrigeration equipment provided by the present invention, step S200: obtaining the target time upon receiving the start-up signal of the compressor 100 includes:

[0102] Step S211: Upon receiving the start-up signal of compressor 100, obtain the start-up speed of compressor 100;

[0103] Step S212: Obtain the target pressure difference that matches the start-up speed based on the start-up speed;

[0104] Step S213: Obtain the preset pressure difference threshold between the suction side and the discharge side of the compressor 100;

[0105] Step S214: Determine the target time based on the pressure difference threshold and the target pressure difference.

[0106] It is understood that before the refrigeration system 1 finishes its previous operating cycle and prepares to start the next operating cycle, the control device can determine the starting speed of the compressor 100 based on user input, pre-default settings of the refrigeration equipment, or other methods. The starting speed can be a specific speed value or a speed range.

[0107] The control device pre-establishes and stores a one-to-one mapping relationship between the starting speed and the target pressure difference. This allows the control device to query the stored database, compare the preset starting speeds in the database one by one, find the preset starting speed that is consistent with or closest to the current required starting speed, and obtain the target pressure difference associated with the preset starting speed during actual operation.

[0108] Next, the control device acquires a preset pressure difference threshold between the intake and exhaust sides of the compressor 100. This pressure difference threshold can also be a system default value, such as data obtained from pre-shipment testing.

[0109] The target time can be determined based on the relationship between the pressure difference threshold and the target pressure difference. It can be understood that during the normal start-up process of the compressor 100, the pressure difference between the suction side and the discharge side will undergo a stable change. The target time is the time required for the compressor 100 to change from the pressure difference threshold to the target pressure difference.

[0110] In addition, please see Figure 10 In the fifth embodiment of the pressure holding control method for the refrigeration equipment provided by the present invention, the refrigeration equipment further includes, as described above, a plurality of throttling components connected in parallel between the condenser 200 and the first evaporator 310 to define a plurality of throttling paths, each of which has a different throttling capacity, and the first switching component 400 can selectively activate any of the throttling paths; step S200: obtaining the target time upon receiving the start-up signal of the compressor 100 specifically includes:

[0111] Step S221: Upon receiving the start-up signal of compressor 100, obtain the target throttling path from multiple throttling paths;

[0112] Step S222: Determine the target time that matches the target throttling path based on the target throttling path.

[0113] It is understood that the throttling capabilities of the multiple throttling paths are set differently. This allows the same amount of cooling capacity flowing out of the condenser 200 to achieve different throttling and pressure reduction effects when flowing through different throttling paths, resulting in differences in the pressure drop changes of the condenser 200 and the pressure difference changes between the suction and discharge sides of the compressor 100. When the target throttling path is determined, the target time can be basically determined.

[0114] The method for determining the target throttling path is not limited. The target throttling path can be a user-specified throttling path; or, in one embodiment, the control device can acquire the operating parameters of the refrigeration system 1 in the previous operating cycle to determine the refrigerant state and gas pressure state at the condenser 200, and can also determine the pressure difference between the suction and discharge sides of the compressor 100, etc. Based on the current operating data and the user's needs, the optimal throttling path can be determined from multiple throttling paths as the target throttling path. The user's needs include cooling time, cooling temperature, etc.

[0115] Based on any of the above embodiments, after step S200, step S300 is further included: controlling the first switching component 400 to connect the condenser 200 and the first evaporator 310, and after maintaining the operation for the target time, controlling the compressor 100 to start.

[0116] In the technical solution provided by this invention, the first switching component 400 cuts off the flow path between the condenser 200 and the first evaporator 310 when the compressor 100 is turned off. This helps maintain the pressure at the condenser 200 and prevents the refrigerant from reabsorbing heat from the environment due to a pressure drop at the condenser 200. It also reduces the energy consumption required to form a pressure difference between the two sides during the compressor 100 restart process, achieving energy saving. Before the compressor 100 restarts, the control device first obtains the target time and then controls the first switching component 400 to connect the condenser 200 and the first evaporator 310. This allows the refrigerant in the condenser 200, after being cooled down during shutdown, to enter the first evaporator 310 and pre-cool it, which helps improve the initial cooling effect of the first evaporator 310 and reduce its energy consumption. It also helps reduce the flow of refrigerant from the condenser 200 into the second evaporator 320.

[0117] Specifically, please refer to Figure 9 In the fourth embodiment of the pressure holding control method for refrigeration equipment provided by the present invention, when step S200 includes steps S211 to S214, step S300: controlling the first switching component 400 to connect the condenser 200 and the first evaporator 310, and maintaining operation for the target time, and then controlling the compressor 100 to start, specifically includes:

[0118] Step S310: Obtain the current pressure difference between the suction side and the discharge side of the compressor 100;

[0119] Step S320: When the current pressure difference is not greater than the pressure difference threshold, control the first switching component 400 to connect the condenser 200 and the first evaporator 310, and after maintaining the operation for the target time, control the compressor 100 to start.

[0120] It is understood that when the differential pressure threshold and the target time are determined, the control device first obtains the current differential pressure between the suction side and the discharge side of the compressor 100. When the current differential pressure is not greater than the differential pressure threshold, it can be determined that the compressor 100 cannot be directly started at present. It is necessary to control the first switching component 400 to connect the condenser 200 and the first evaporator 310 to allow the refrigerant in the condenser 200 to flow to the first evaporator 310 and maintain the operation for the target time. When the refrigerant flow rate, the pressure drop of the condenser 200, and the differential pressure of the compressor 100 meet the preset conditions, the compressor 100 is then controlled to start.

[0121] The specific method for obtaining the current differential pressure is not limited:

[0122] In one embodiment, step S310: obtaining the current pressure difference between the suction side and the discharge side of the compressor 100 includes:

[0123] Step S311: Obtain the suction pressure and discharge pressure of compressor 100;

[0124] Step S312: Calculate the current pressure difference based on the intake pressure and the exhaust pressure.

[0125] When the refrigeration device is configured as described above, both the intake-side sensor 810 and the exhaust-side sensor 820 are pressure sensors. The control device is electrically connected to the intake-side sensor 810 and the exhaust-side sensor 820 respectively, so as to acquire the intake pressure sensed by the intake-side sensor 810 and the exhaust pressure sensed by the exhaust-side sensor 820 in real time, according to a set period, or under set conditions. Based on the intake pressure and the exhaust pressure, the current pressure difference is directly calculated.

[0126] In another embodiment, step S311: obtaining the suction pressure and discharge pressure of the compressor 100 includes:

[0127] Step S311a: Obtain the room temperature and ambient temperature inside and outside the room where the second evaporator 320 is located;

[0128] Step S311b: Determine the suction pressure of compressor 100 based on the chamber temperature;

[0129] Step S311c: Determine the discharge pressure of compressor 100 based on the ambient temperature.

[0130] When the refrigeration equipment can sense and obtain the ambient temperature and the compartment temperature within the refrigeration equipment in real time, according to a set cycle, or under set conditions, the control device can determine the suction pressure and the discharge pressure based on the ambient temperature and the compartment temperature, and then calculate the current pressure difference based on the suction pressure and the discharge pressure. The compartment may specifically refer to the freezer compartment; the compartment temperature is generally related to the suction pressure, and the ambient temperature is generally related to the discharge pressure.

[0131] In addition, please see Figure 11 In the sixth embodiment of the pressure holding control method for refrigeration equipment provided by the present invention, if the refrigeration equipment further includes a connecting branch 610 and a second switching component 620 as described above, the input end of the connecting branch 610 is connected between the first evaporator 310 and the second evaporator 320, and the output end of the connecting branch 610 is connected between the second evaporator 320 and the compressor 100; the second switching component 620 is used to control the on / off state of the connecting branch 610; step S300: controlling the first switching component 400 to connect the condenser 200 and the first evaporator 310, and after maintaining the operation for the target time, controlling the compressor 100 to start specifically includes:

[0132] Step S320: Control the first switching component 400 to connect the condenser 200 and the first evaporator 310, and control the second switching component 620 to connect the connecting branch 610. After maintaining the operation for the target time, control the compressor 100 to start.

[0133] It is understood that when the control device controls the first switching component 400 to connect the condenser 200 and the first evaporator 310 and maintains the target time, the refrigerant in the condenser 200, after being cooled down by shutdown, enters the first evaporator 310 and pre-cools it, which helps to improve the initial cooling effect of the first evaporator 310 and reduce its energy consumption. When the control device controls the second switching component 620 to connect the connecting branch 610 and maintains the target time, the refrigerant flowing out of the first evaporator 310 is transferred to the downstream of the second evaporator 320 via the connecting branch 610, preventing the refrigerant from entering the second evaporator 320 and causing the temperature of the compartment where the second evaporator 320 is located to rise, thereby helping to reduce the energy consumption of the second evaporator 320.

[0134] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A pressure-holding control method for a refrigeration device, characterized in that, The refrigeration equipment includes a compressor, a condenser, a first evaporator, and a second evaporator connected in sequence through a pipeline structure to form a refrigeration circuit. The refrigeration temperature of the first evaporator is greater than that of the second evaporator. The refrigeration equipment also includes a first switching component disposed between the condenser and the first evaporator. The first switching component is used to control the on / off connection between the condenser and the first evaporator. The pressure-maintaining control method of the refrigeration equipment includes: Upon receiving the compressor start-up signal, acquire the target time; After controlling the first switching component to connect the condenser and the first evaporator and maintaining operation for the target time, the compressor is then started. The refrigeration equipment further includes a connecting branch and a second switching component. The input end of the connecting branch is connected between the first evaporator and the second evaporator, and the output end of the connecting branch is connected between the second evaporator and the compressor. The second switching component is used to control the on / off state of the connecting branch. The step of controlling the first switching component to connect the condenser and the first evaporator, and maintaining operation for the target time, and then controlling the compressor to start includes: After controlling the first switching component to connect the condenser and the first evaporator, and controlling the second switching component to connect the connecting branch, and maintaining operation for the target time, the compressor is then started.

2. The pressure holding control method for refrigeration equipment as described in claim 1, characterized in that, Before the step of obtaining the target time upon receiving the compressor's start-up signal, the method further includes: Upon receiving a shutdown signal from the compressor, the first switching component is controlled to disconnect the connection between the condenser and the first evaporator.

3. The pressure holding control method for refrigeration equipment as described in claim 1, characterized in that, The step of obtaining the target time upon receiving the compressor start-up signal includes: Upon receiving the compressor start-up signal, obtain the compressor start-up speed; Based on the start-up speed, obtain the target pressure difference that matches the start-up speed; Obtain the preset pressure difference threshold between the intake and exhaust sides of the compressor; The target time is determined based on the pressure difference threshold and the target pressure difference.

4. The pressure holding control method for refrigeration equipment as described in claim 3, characterized in that, The step of controlling the first switching component to connect the condenser and the first evaporator, and maintaining operation for the target time, and then controlling the compressor to start includes: Obtain the current pressure difference between the suction and discharge sides of the compressor; When the current pressure difference is not greater than the pressure difference threshold, the first switching component is controlled to connect the condenser and the first evaporator, and after maintaining the operation for the target time, the compressor is controlled to start.

5. The pressure holding control method for refrigeration equipment as described in claim 4, characterized in that, The step of obtaining the current pressure difference between the suction side and the discharge side of the compressor includes: Obtain the compressor's suction pressure and discharge pressure; Calculate the current pressure difference based on the intake pressure and the exhaust pressure.

6. The pressure holding control method for refrigeration equipment as described in claim 4, characterized in that, The steps for obtaining the compressor's suction pressure and discharge pressure include: Obtain the chamber temperature and ambient temperature inside and outside the chamber where the second evaporator is located; The compressor's suction pressure is determined based on the chamber temperature. The compressor's discharge pressure is determined based on the ambient temperature.

7. The pressure holding control method for refrigeration equipment as described in claim 1, characterized in that, The refrigeration equipment also includes a plurality of throttling components arranged in parallel between the condenser and the first evaporator to define a plurality of throttling paths. Each of the throttling paths has a different throttling capacity, and the first switching component can selectively switch on any of the throttling paths. The step of obtaining the target time upon receiving the compressor start-up signal includes: Upon receiving the compressor start-up signal, the target throttling path is obtained from multiple throttling paths; Based on the target throttling path, determine the target time that matches the target throttling path.

8. A control device, characterized in that, The device includes a memory, a processor, and a pressure holding control program for a refrigeration device stored in the memory and executable on the processor, the pressure holding control program being configured to implement the steps of the pressure holding control method for a refrigeration device as claimed in any one of claims 1 to 7.

9. A refrigeration device, characterized in that, include: A refrigeration system includes a compressor, a condenser, a first evaporator, and a second evaporator, which are sequentially connected via piping to form a refrigeration circuit. The refrigeration temperature of the first evaporator is higher than that of the second evaporator. The refrigeration system also includes a first switching component disposed between the condenser and the first evaporator, which controls the on / off switching between the condenser and the first evaporator. The control device as claimed in claim 8 is electrically connected to the compressor and the switching component, respectively.

10. The refrigeration equipment as described in claim 9, characterized in that, The refrigeration circuit also includes a plurality of throttling components connected in parallel between the condenser and the first evaporator to define a plurality of throttling paths. Each of the throttling paths has a different throttling capacity, and the first switching component can selectively switch on any of the throttling paths.

11. The refrigeration equipment as described in claim 9, characterized in that, The refrigeration equipment further includes a connecting branch and a second switching component. The input end of the connecting branch is connected between the first evaporator and the second evaporator, and the output end of the connecting branch is connected between the second evaporator and the compressor. The second switching component is used to control the on / off state of the connecting branch.

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