Refrigeration system and refrigeration apparatus

Abstract

Disclosed in the present application are a refrigeration system and refrigeration apparatus. The refrigeration system comprises a compressor (100), a condenser (200), a first branch (300) and a second branch (400), wherein the compressor (100) is provided with a main air suction port (110), an auxiliary air suction port (120) and an air exhaust port (130); the first branch (300) comprises a gas-liquid separator (320), a first throttling element (310) and a freezing evaporator (330); and the second branch (400) comprises a second throttling element (410) and a refrigerating evaporator (420), which are connected in series.

Description

Refrigeration systems and refrigeration equipment Technical Field

[0001] This application claims priority to Chinese patent application number 202311459875.3, filed on November 1, 2023, entitled “Refrigeration System and Refrigeration Equipment”. The entire contents of the above patent application are incorporated by reference into this application.

[0002] Technical Field

[0003] The present application relates to the field of refrigeration technology, and in particular to a refrigeration system and refrigeration equipment. Background Art

[0004] Currently, refrigerators use single-suction compressors, which are connected to components such as the condenser and evaporator, forming a conventional single-suction series-parallel or pure parallel refrigeration system. This results in low cooling capacity. Related technologies have replaced single-suction compressors with double-suction compressors. While these offer the advantage of high cooling capacity, the cooling capacity of conventional refrigeration circuits is limited, making the cooling temperature difficult to meet the freezing requirements of deep-freeze refrigerators.

[0005] Summary of the Invention

[0006] The present application aims to at least partially solve one of the technical problems existing in the prior art. To this end, the present application proposes a refrigeration system and a refrigeration device using the refrigeration system.

[0007] An embodiment of the first aspect of the present application provides a refrigeration system, including a compressor, a condenser, a first branch and a second branch, the compressor having a main air intake, an auxiliary air intake and an exhaust port; the inlet of the condenser is connected to the exhaust port; the first branch includes a gas-liquid separator, a first throttling device and a refrigeration evaporator, the inlet of the gas-liquid separator is connected to the outlet of the condenser through the first throttling device, the liquid phase outlet of the gas-liquid separator is connected to the refrigeration evaporator, the gas phase outlet of the gas-liquid separator is connected to the auxiliary air intake, and the outlet of the refrigeration evaporator is connected to the main air intake; the second branch includes a second throttling device and a refrigeration evaporator connected in series, the inlet of the second branch is connected to the outlet of the condenser, and the outlet of the second branch is connected to the auxiliary air intake.

[0008] In some embodiments of the present application, the refrigeration system further includes a one-way valve connected between the gas phase outlet and the secondary air intake.

[0009] In some embodiments of the present application, the refrigeration system also includes a bypass branch and a control valve, wherein the bypass branch includes a flow regulating member, one end of the flow regulating member is connected to the second branch, and the other end is connected to the main air intake port, and the bypass branch is used to divert part of the refrigerant passing through the second branch to the main air intake port; and the control valve is used to control the opening and closing of the first branch and the second branch.

[0010] In some embodiments of the present application, the flow regulating member is a stop valve, and the control valve and the stop valve are configured to: when the compartment corresponding to the refrigeration evaporator reaches a preset temperature, control the control valve to close the first branch and open the stop valve.

[0011] In some embodiments of the present application, the flow regulating member is a capillary tube, one end of which is connected to the inlet of the second throttling member, the inlet of the refrigerated evaporator or the outlet of the refrigerated evaporator, and the other end is connected to the main air intake port.

[0012] In some embodiments of the present application, the first branch further includes a third throttling member, and the third throttling member is connected between the liquid phase outlet of the gas-liquid separator and the refrigeration evaporator.

[0013] In some embodiments of the present application, the refrigeration system also includes a third branch and a control valve, wherein the third branch includes a fourth throttling device and a variable temperature evaporator connected in series, the inlet of the third branch is connected to the outlet of the condenser, and the outlet of the third branch is connected to the main air intake; and the control valve is used to control the on and off of the first branch, the second branch and the third branch.

[0014] In some embodiments of the present application, the refrigeration system further includes a bypass branch, wherein the bypass branch includes a stop valve connected between the outlet of the refrigeration evaporator and the main air intake port; the control valve and the stop valve are configured as follows:

[0015] When the compartment corresponding to the freezing evaporator reaches the preset freezing temperature, controlling the control valve to close the first branch and opening the stop valve;

[0016] When the compartment corresponding to the variable temperature evaporator reaches the variable temperature preset temperature, the control valve is controlled to close the third branch and the stop valve is opened; or

[0017] When the compartment corresponding to the freezing evaporator and the compartment corresponding to the temperature variable evaporator both reach the preset temperature,

[0018] The control valve is controlled to close the first branch and the third branch, and the stop valve is opened.

[0019] In some embodiments of the present application, the refrigeration system also includes a bypass branch, which includes a capillary tube, one end of which is connected to the inlet of the second throttling member, the inlet of the refrigerated evaporator or the outlet of the refrigerated evaporator, and the other end is connected to the main air intake.

[0020] In some embodiments of the present application, the control valve is an electric valve, and the electric valve is connected to the inlet of the first branch and the inlet of the second branch respectively.

[0021] In some embodiments of the present application, both the first throttling member and the second throttling member are capillaries.

[0022] An embodiment of the second aspect of the present application provides a refrigeration device, including the refrigeration system described in the first aspect of the above embodiment.

[0023] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic diagram of the structural principle of a refrigeration system in a first embodiment of the present application;

[0025] FIG2 is a schematic diagram of the structural principle of a refrigeration system in a second embodiment of the present application;

[0026] FIG3 is a schematic diagram of the structural principle of a refrigeration system in a third embodiment of the present application;

[0027] FIG4 is a schematic diagram of the structural principle of a refrigeration system in a fourth embodiment of the present application;

[0028] FIG5 is a schematic diagram of the structural principle of a refrigeration system in a fifth embodiment of the present application; and

[0029] FIG6 is a schematic diagram showing the structural principle of a refrigeration system according to a sixth embodiment of the present application.

[0030] Reference numerals:

[0031] Compressor 100; main air intake 110; auxiliary air intake 120; exhaust port 130;

[0032] Condenser 200;

[0033] First branch 300; first throttling member 310; gas-liquid separator 320; inlet 321; gas phase outlet 322; liquid phase outlet 323; refrigeration evaporator 330; one-way valve 340; third throttling member 350;

[0034] Second branch 400; second throttle 410; refrigeration evaporator 420;

[0035] Control valve 500;

[0036] Bypass branch 600; flow regulating member 610; stop valve 611; bypass capillary tube 612;

[0037] The third branch 700; the fourth throttle element 710; the temperature-variable evaporator 720;

[0038] Refrigeration system 1000. DETAILED DESCRIPTION

[0039] In order to more clearly understand the above-mentioned objects, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.

[0040] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0041] In the description of this application, it should be understood that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0042] In the description of this application, if there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0043] In the description of this application, it should be noted that terms such as setting, installing, and connecting should be understood in a broad sense, and technical personnel in the relevant technical field can reasonably determine the specific meaning of the above terms in this application based on the specific content of the technical solution.

[0044] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described below are only part of the embodiments of the present application, not all of the embodiments.

[0045] As shown in Figure 1, an embodiment of the present application provides a refrigeration system 1000, including a compressor 100, a condenser 200, a first branch 300 and a second branch 400. The compressor 100, the condenser 200, the first branch 300 and the second branch 400 are connected to form a refrigerant circulation loop.

[0046] Specifically, the compressor 100 used in the embodiment is a double-suction compressor, which has a main suction port 110, a secondary suction port 120 and an exhaust port 130. Compared with a single-suction compressor, the double-suction compressor can simultaneously intake air through the main suction port 110 and the secondary suction port 120 for compression, which can improve the intake volume and compression efficiency.

[0047] As shown in Figure 1, the first branch 300 includes a gas-liquid separator 320, a first throttling member 310 and a refrigeration evaporator 330. The main function of the gas-liquid separator 320 is to separate the gaseous refrigerant and the liquid refrigerant. The gas-liquid separator 320 is provided with an inlet 321, a gas phase outlet 322 and a liquid phase outlet 323. The inlet 321 of the gas-liquid separator 320 is connected to the first throttling member 310, the gas phase outlet 322 is connected to the auxiliary air intake 120 of the compressor 100, and the liquid phase outlet 323 is connected to the refrigeration evaporator 330. The end of the first throttling member 310 away from the gas-liquid separator 320 is connected to one end of the condenser 200, the other end of the condenser 200 is connected to the exhaust port 130 of the compressor 100, and the outlet of the refrigeration evaporator 330 is connected to the main air intake 110 of the compressor 100.

[0048] After passing through the condenser 200, the refrigerant enters the first branch 300, is first throttled by the first throttling device 310, and then is separated into gaseous and liquid refrigerants by the gas-liquid separator 320, wherein the gaseous refrigerant enters the compressor 100 through the auxiliary air intake 120 for compression; the liquid refrigerant enters the freezing evaporator 330 for refrigeration, that is, the refrigerant is in a full liquid state. The freezing evaporator 330 can be a direct cooling evaporator. In the full liquid state, the cooling capacity is greatly improved, thereby reducing the evaporation temperature, having a lower cooling temperature, and improving the operating efficiency of the refrigeration system 1000.

[0049] It should be noted that the principle of the gas-liquid separator 320 is: the density of the gas-phase refrigerant (gaseous refrigerant) is less than the density of the liquid-phase refrigerant (liquid refrigerant). When the gas-phase refrigerant and the liquid-phase refrigerant are passed into the separation chamber, the gas-phase refrigerant will flow to the top of the separation chamber, while the liquid-phase refrigerant will be deposited to the bottom of the separation chamber, thereby realizing the stratification and separation of the gas-phase refrigerant and the liquid-phase refrigerant.

[0050] 1 , the second branch 400 includes a second throttle member 410 and a refrigeration evaporator 420 . The second throttle member 410 and the refrigeration evaporator 420 are connected in series. The second branch 400 operates in parallel with the first branch 300 , so that the freezing evaporator 330 and the refrigeration evaporator 420 can cool each other independently.

[0051] In some embodiments, one end of the second throttle member 410 is connected to the condenser 200, and the other end is connected to the refrigeration evaporator 420. The end of the refrigeration evaporator 420 away from the second throttle member 410 is connected to the auxiliary air intake 120 of the compressor 100. In other words, the inlet of the second branch 400 is connected to the outlet of the condenser 200, and the outlet of the second branch 400 is connected to the auxiliary air intake 120. It can be understood that the freezing evaporator 330 is connected to the main air intake 110, and the refrigeration evaporator 420 is connected to the auxiliary air intake 120, so that the freezing evaporator 330 and the refrigeration evaporator 420 can operate together to achieve efficient cooling. The direction indicated by the arrow in Figure 1 is the direction of refrigerant flow in the cooling state.

[0052] For example, a refrigerator has a freezer compartment and a refrigerator compartment. A freezing evaporator 330 is located in the freezer compartment, while a cooling evaporator 420 is located in the refrigerator compartment. The cooling evaporator 420 can be a direct-cooling evaporator or an air-cooling evaporator. In this way, the freezing evaporator 330 and the cooling evaporator 420 can operate together to achieve efficient cooling. This refrigerator has both freezing and cooling functions to meet the storage needs of various items in different temperature ranges.

[0053] It should be noted that since the gas phase outlet 322 of the refrigerated evaporator 420 and the gas-liquid separator 320 are both connected to the auxiliary air intake port 120, when the first branch 300 and the second branch 400 are in refrigeration operation together, the refrigerant passing through the refrigerated evaporator 420 and the separated gaseous refrigerant both enter the compressor 100 through the auxiliary air intake port 120 for compression, thereby improving the operating efficiency of the refrigeration system 1000 and achieving efficient refrigeration.

[0054] As shown in Figure 1, in some embodiments, the first throttling member 310 and the second throttling member 410 are both capillaries. The capillary tube has a throttling function. The high-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure refrigerant after passing through the capillary tube throttling, so that the refrigerant enters the freezing evaporator 330 and the refrigeration evaporator 420 respectively for evaporation.

[0055] It is understood that the evaporation temperature and evaporation pressure of the refrigeration system 1000 can be adjusted by changing the length or inner diameter of the capillary tube. To increase the evaporation temperature, the capillary tube can be shortened or its inner diameter increased; to decrease the evaporation temperature, the capillary tube can be lengthened or its inner diameter decreased. In the embodiments, the capillary tube length and inner diameter are selected based on actual requirements.

[0056] Of course, this is only an example, and the first throttle member 310 and the second throttle member 410 are not limited to capillaries. In some embodiments, the first throttle member 310 and the second throttle member 410 can be expansion valves or other throttling components, or one of them can be a capillary tube and the other can be other throttling components.

[0057] It is understood that the refrigerant in the refrigeration system 1000 pipeline, in its gas-liquid two-phase mixed state, presents a problem of refrigerant dryness. Refrigerant dryness refers to the weight proportion of refrigerant vapor in the wet saturated vapor, that is, the proportion of the gaseous portion of the refrigerant. The gas-liquid separator 320 can separate the gaseous and liquid refrigerants, thereby reducing the refrigerant dryness. It is understood that a lower refrigerant dryness indicates less gaseous refrigerant and more liquid refrigerant, resulting in a better cooling effect. Therefore, separating the liquid refrigerant and allowing it to enter the refrigeration evaporator 330 for cooling can achieve a lower evaporation temperature.

[0058] Taking a refrigerator as an example, the refrigeration temperature of a refrigerator using a conventional refrigeration circuit in the related art is usually between -18°C and 24°C, which is only suitable for preserving ordinary food ingredients. However, with the improvement of living standards, users' storage needs for food and precious food ingredients are gradually increasing. For example, tuna can only be stored for 3 months at a temperature of -18°C and for 2 years at a temperature of -60°C. A deep-freeze refrigerator (also called a deep-freeze refrigerator) using the refrigeration system 1000 of the above embodiment can increase the refrigeration capacity by reducing the dryness of the refrigerant entering the freezing evaporator 330, so that the freezing temperature can reach -40°C or even below -60°C, meeting the deep-freeze temperature requirements. It has cell-level freezing technology, and the cold air reaches the cells directly without damaging them, and can be preserved for a long time. Moreover, the deep-freeze refrigerator product can enable food to quickly pass through the ice crystal zone and reach a glassy state for better food preservation.

[0059] Furthermore, due to its advantages of large cooling capacity and high coefficient of performance (COP), the double-suction compressor can ensure that the refrigerator has both deep-freezing function and low energy consumption performance, and can achieve double-suction refrigeration, thereby improving cooling capacity and energy efficiency, and making the refrigeration system 1000 more efficient. The compressor 100 can be a piston compressor or a centrifugal compressor.

[0060] It should be noted that the double-suction compressor has a main suction pipe corresponding to the main suction port 110, and a secondary suction pipe corresponding to the secondary suction port 120. The main suction pipe and the secondary suction pipe are both independently set, among which the main suction port 110 is also called the first suction port, and the secondary suction port 120 is also called the second suction port. In a reciprocating stroke of the piston, there are four steps including main suction, secondary suction, compression and exhaust. First, there are two intakes of low-pressure main suction and then medium-pressure secondary suction, which increase the single-stroke intake volume and increase the starting pressure of compression in the cylinder, which can bring about a significant increase in cooling capacity and improvement in COP.

[0061] As shown in Figure 1, in some embodiments, the refrigeration system 1000 also includes a one-way valve 340, which is connected between the gas phase outlet 322 of the gas-liquid separator 320 and the auxiliary air intake 120 of the compressor 100. The one-way valve 340 can make the gaseous refrigerant discharged from the gas-liquid separator 320 flow to the compressor 100 in one direction, thereby preventing the refrigerant of the refrigeration evaporator 420 from flowing into the gas-liquid separator 320 through the gas phase outlet 322 and further entering the freezing evaporator 330, thereby ensuring the stable operation of the freezing evaporator 330.

[0062] It is understandable that the one-way valve 340 is also called a check valve. The specific form of the one-way valve 340 is not limited. It is specifically a valve body that can ensure that the refrigerant flows along the gas phase outlet 322 toward the auxiliary air intake 120 but cannot flow in the opposite direction.

[0063] As shown in Figure 1, in some embodiments, the refrigeration system 1000 also includes a control valve 500, which is respectively connected to the condenser 200, the first branch 300 and the second branch 400. The control valve 500 can control one of the first branch 300 and the second branch 400 to be conductive, and can control the first branch 300 and the second branch 400 to be conductive at the same time.

[0064] For example, the control valve 500 is an electric valve, which is provided with a first end a, a second end b and a third end c. The first end a is connected to the outlet of the condenser 200, the second end b is connected to the inlet of the first throttling member 310, and the third end c is connected to the inlet of the second throttling member 410. The electric valve can control the conduction or disconnection of the second end b and the third end c, thereby controlling the connection and disconnection of the first branch 300 and the second branch 400, and thereby realizing the connection of the electric valve with the condenser 200, the first branch 300 and the second branch 400.

[0065] Specifically, when the electric valve controls the second end b and the third end c to be simultaneously conductive, the refrigerant can be diverted through the electric valve to the first branch 300 and the second branch 400, allowing the freezing evaporator 330 and the refrigeration evaporator 420 to cool simultaneously. When the freezer compartment reaches the preset freezing temperature, the electric valve can control the second end b to be disconnected and the third end c to be conductive. At this time, the freezing evaporator 330 stops operating, while the refrigeration evaporator 420 continues operating until the refrigerator compartment reaches the preset refrigeration temperature.

[0066] As shown in Figure 1, the first branch 300 also includes a third throttling member 350, which is connected between the liquid phase outlet 323 of the gas-liquid separator 320 and the freezing evaporator 330. The liquid refrigerant separated by the gas-liquid separator 320 enters the freezing evaporator 330 after passing through the third throttling member 350. The refrigerant is throttled by the third throttling member 350, and the evaporation temperature and evaporation pressure can be further adjusted, thereby realizing the control of the refrigeration temperature of the freezing evaporator 330.

[0067] In some embodiments, the third throttling element 350 is a capillary tube. The capillary tube has a throttling function. After the liquid refrigerant passes through the capillary tube, the evaporation temperature and evaporation pressure are further reduced to achieve a lower freezing temperature. The length and inner diameter of the capillary tube are adjusted according to actual requirements. Of course, this is merely an example, and the third throttling element 350 is not limited to a capillary tube. The third throttling element 350 may also be an expansion valve or other throttling component.

[0068] It should be noted that in the embodiment shown in FIG. 1 , the first throttle member 310 , the second throttle member 410 and the third throttle member 350 are all capillary tubes, which can reduce the cost of the refrigeration system 1000 , reduce control differences, and help improve operational stability.

[0069] As shown in Figure 2, the difference between the embodiment shown in Figure 2 and the embodiment shown in Figure 1 is that the refrigeration system 1000 also includes a bypass branch 600, and the bypass branch 600 includes a flow regulating component 610. The flow regulating component 610 is connected between the outlet of the refrigeration evaporator 420 and the main air intake port 110. The refrigerant passing through the second branch 400 can flow to the main air intake port 110 through the bypass branch 600. The flow regulating component 610 is used to adjust the refrigerant flow of the bypass branch 600. The flow regulating component 610 can be a flow valve or a throttling component, such as an electronic expansion valve, a flow control valve, a capillary tube, etc.

[0070] To illustrate with a specific example, the flow regulating element 610 in the embodiment shown in FIG2 is a shut-off valve 611. During cooling operation, the electric valve controls the simultaneous conduction of the first branch 300 and the second branch 400, allowing the refrigeration evaporator 420 and the freezer evaporator 330 to cool, respectively, while simultaneously controlling the closing of the shut-off valve 611. When the refrigeration compartment reaches the preset refrigeration temperature, that is, when the refrigeration evaporator 420 reaches its shutdown point (for example, if the preset refrigeration temperature is 4°C), when the refrigeration compartment temperature drops to 4°C, the refrigeration evaporator 421 reaches its shutdown point. At this point, the second branch 400 is controlled to close while the first branch 300 remains open. Since the gas phase outlet 322 is connected to the auxiliary air intake 120, the gaseous refrigerant continues to enter the compressor 100 for compression. In other words, the main air intake 110 and the auxiliary air intake 120 can remain operational even when the second branch 400 is closed.

[0071] When the freezer compartment reaches the preset freezing temperature, the freezing evaporator 330 reaches the shutdown point while the refrigeration evaporator 420 has not reached the shutdown point. The first branch 300 is controlled to be closed and the second branch 400 is kept open. No refrigerant flows out of the gas phase outlet 322 and the liquid phase outlet 323. Since there is a bypass branch 600 between the outlet of the refrigeration evaporator 420 and the main air intake 110, the stop valve 611 is controlled to be opened at this time, so that a part of the refrigerant passing through the refrigeration evaporator 420 flows to the auxiliary air intake 120, and the other part of the refrigerant flows to the main air intake 110 through the bypass branch 600. Both the main air intake 110 and the auxiliary air intake 120 can work normally, so that the refrigeration evaporator 420 continues to operate until it reaches the shutdown point. For example, the preset freezing temperature is minus 40°C and the preset refrigeration temperature is 4°C. When the temperature of the freezing compartment drops to minus 40°C, the freezing evaporator 330 reaches the shutdown point, and the refrigeration evaporator 420 continues to maintain cooling until the temperature of the refrigeration compartment reaches 4°C.

[0072] It is understandable that in the embodiment shown in FIG1 , when the compressor 100 has not reached its shutdown point and there is no bypass branch 600, closing the first branch 300 will cause the main air intake 110 to close, affecting the operational stability of the compressor 100. Consequently, there is the problem that the main air intake 110 cannot be closed independently. Based on this, by adding the bypass branch 600 and cooperating with the electric valve, it is possible to control the electric valve to close the first branch 300 and open the shut-off valve 611 when the refrigeration evaporator 330 reaches its shutdown point, thereby maintaining the continued operation of the refrigeration evaporator 420 without affecting the operation of the main air intake 110, effectively resolving the problem that the main air intake 110 cannot be closed independently.

[0073] 3 , the flow regulating member 610 of the embodiment shown in FIG3 is a capillary tube, which can be understood as a bypass capillary tube 612. That is, the bypass branch 600 connects the outlet of the refrigeration evaporator 420 with the main air intake port 110 via the bypass capillary tube 612. It is understood that, compared to the shut-off valve 611, the bypass capillary tube 612 can maintain the bypass branch 600 in a conductive state. Therefore, during the operation of the refrigeration evaporator 420, a certain flow of refrigerant is maintained to flow to the main air intake port 110. The overall operating efficiency of the refrigeration system 1000 is slightly lower than that of the embodiment shown in FIG2 . However, the bypass capillary tube 612 can reduce system costs and control differences, resulting in low control costs and greater convenience for production applications.

[0074] It should be noted that this is only an example. The bypass capillary 612 is not limited to being connected between the outlet of the refrigerated evaporator 420 and the main air intake 110. The inlet of the bypass capillary 612 can also be connected between the electric valve and the second throttle member 410, or between the second throttle member 410 and the refrigerated evaporator 420. For example, one end of the bypass capillary 612 is connected to the outlet of the second throttling member 410, and the other end is connected to the main air intake port 110. In this way, after the refrigeration evaporator 330 reaches the shutdown point, the electric valve controls the closing of the first branch 300. After the refrigerant in the second branch 400 is throttled by the second throttling member 410, a part of the refrigerant will pass through the refrigeration evaporator 420 for cooling, and then flow to the auxiliary air intake port 120; the other part of the refrigerant will pass through the bypass capillary 612 and flow to the main air intake port 110, so that both the main air intake port 110 and the auxiliary air intake port 120 can inhale the refrigerant, and the compressor 100 can operate normally, thereby allowing the refrigeration evaporator 420 to continue to operate until it reaches the shutdown point.

[0075] 4 , the difference between the embodiment shown in FIG4 and the embodiment shown in FIG1 is that the refrigeration system 1000 further includes a third branch 700, the third branch 700 includes a fourth throttling member 710 and a temperature-variable evaporator 720, one end of the fourth throttling member 710 is connected to the control valve 500, and the other end of the fourth throttling member 710 is connected to the temperature-variable evaporator 720, and the temperature-variable evaporator 720 is connected to the main air intake port 110, that is, the inlet of the third branch 700 is connected to the outlet of the condenser 200, and the outlet of the third branch 700 is connected to the main air intake port 110, so that the third branch 700 is connected in parallel with the first branch 300.

[0076] It can be understood that the control valve 500 is used to control the on-off of the first branch 300, the second branch 400 and the third branch 700. It can control one or two branches to be turned on, or all three branches to be turned on, that is, the freezing evaporator 330, the refrigeration evaporator 420 and the variable temperature evaporator 720 run refrigeration at the same time; the freezing evaporator 330, the refrigeration evaporator 420 and the variable temperature evaporator 720 are independent of each other, and can realize precise control of refrigeration independently without being affected by other branches, and have higher operating efficiency.

[0077] Specifically, the electric valve is also provided with a fourth end d, which is connected to the inlet of the fourth throttling member 710. The electric valve can control the conduction or disconnection of the second end b, the third end c and the fourth end d, thereby controlling the conduction or disconnection of the first branch 300, the second branch 400 and the third branch 700.

[0078] It is understood that the variable temperature evaporator 720 is suitable for refrigerators with a variable temperature chamber. The variable temperature evaporator 720 is located in the variable temperature chamber. The variable temperature chamber can increase the refrigerator's storage capacity for various foods at different temperature ranges. The variable temperature evaporator 720 can be a direct-cooled evaporator or an air-cooled evaporator. When the variable temperature chamber reaches the preset temperature, the variable temperature evaporator 720 reaches the shutdown point, and the electric valve controls the closing of the third branch 700.

[0079] As shown in Figure 4, when the freezing evaporator 330 reaches the shutdown point, the electric valve can control the closure of the first branch 300 to keep the refrigeration evaporator 420 and the temperature-variable evaporator 720 continuing to operate; when the refrigeration evaporator 420 reaches the shutdown point, the electric valve can control the closure of the second branch 400 to keep the freezing evaporator 330 and the temperature-variable evaporator 720 continuing to operate; considering that the compressor 100 needs to keep the main air intake 110 in the air intake working state before reaching the shutdown point, the electric valve can control at least one of the first branch 300 and the third branch 700 to keep running.

[0080] In some embodiments, the fourth throttle element 710 is a capillary tube, which is used to reduce the evaporation temperature and evaporation pressure of the temperature-variable evaporator 720. The length and inner diameter of the capillary tube are adjusted according to actual requirements. Of course, this is merely an example, and the fourth throttle element 710 is not limited to a capillary tube. The fourth throttle element 710 may also be an expansion valve or other throttling component.

[0081] As shown in Figure 5, the difference between the embodiment shown in Figure 5 and the embodiment shown in Figure 4 is that the refrigeration system 1000 also includes a bypass branch 600, and the bypass branch 600 includes a flow regulating component 610. The flow regulating component 610 is connected between the outlet of the refrigeration evaporator 420 and the main air intake 110. The refrigerant passing through the refrigeration evaporator 420 can be diverted to the main air intake 110 through the bypass branch 600.

[0082] The flow regulating member 610 in the embodiment shown in FIG5 is a shut-off valve 611. During refrigeration operation, the electric valve controls the first branch 300, the second branch 400, and the third branch 700 to be simultaneously open, allowing the refrigeration evaporator 420, the freezing evaporator 330, and the temperature-variable evaporator 720 to perform cooling operations, while simultaneously controlling the shut-off valve 611 to close. When the refrigeration evaporator 420 reaches its shutdown point, the second branch 400 is controlled to close, while the temperature-variable evaporator 720 and the freezing evaporator 330 continue to operate. Because the gas phase outlet 322 is connected to the auxiliary air intake 120, the gaseous refrigerant enters the compressor 100 through the auxiliary air intake 120. In other words, the main air intake 110 and the auxiliary air intake 120 can remain operational even when the second branch 400 is closed.

[0083] When the freezing evaporator 330 and the variable temperature evaporator 720 both reach the shutdown point and the refrigeration evaporator 420 has not reached the shutdown point, the first branch 300 and the third branch 700 are controlled to be closed and the second branch 400 is kept open. At this time, the stop valve 611 is controlled to open, so that a part of the refrigerant passing through the refrigeration evaporator 420 flows to the auxiliary air intake 120, and the other part of the refrigerant flows to the main air intake 110 through the bypass branch 600. The main air intake 110 and the auxiliary air intake 120 can both work normally. In this way, the refrigeration evaporator 420 continues to operate until it reaches the shutdown point, which can solve the problem that the main air intake 110 cannot be closed alone.

[0084] Of course, in some embodiments, when the freezing compartment reaches the preset freezing temperature, the first branch 300 can be closed by the control valve 500 and the stop valve 611 can be opened. At this time, the second branch 400 and the third branch 700 can continue to operate, and the bypass branch 600 can also be opened, so that a portion of the refrigerant in the second branch 400 can flow to the main suction port 110, which can improve the operating efficiency of the compressor 100.

[0085] When the variable temperature chamber reaches the preset variable temperature, the third branch 700 can be closed by the control valve 500 and the stop valve 611 can be opened. At this time, the first branch 300 and the second branch 400 can continue to operate. At the same time, the bypass branch 600 can also be opened, so that part of the refrigerant in the second branch 400 can flow to the main suction port 110, which can also improve the operating efficiency of the compressor 100.

[0086] 6 , the flow regulating member 610 of the embodiment shown in FIG6 is a bypass capillary tube 612. The bypass branch 600 connects the outlet of the refrigeration evaporator 420 to the main air intake port 110 via the bypass capillary tube 612. During operation of the refrigeration evaporator 420, the bypass capillary tube 612 maintains a certain flow rate of refrigerant flowing to the main air intake port 110. The bypass capillary tube 612 can reduce system costs and control variations, resulting in low control costs and greater advantages for production applications.

[0087] It should be noted that in the embodiments shown in Figures 3 and 6, the length and inner diameter of the bypass capillary 612 of the bypass branch 600 can meet the requirements of keeping part of the refrigerant flowing to the main air intake 110, and a certain flow of refrigerant can pass through the refrigerated evaporator 420 on the second branch 400, ensuring that the refrigerated evaporator 420 can continue to operate for refrigeration when the first branch 300 is closed. The specific length and inner diameter of the bypass capillary 612 can be selected according to actual requirements.

[0088] An embodiment of the present application further provides a refrigeration device, comprising the refrigeration system 1000 of the above-described embodiment. The refrigeration device may be a refrigerator, a freezer, or the like, and may specifically be a cryogenic refrigerator. The refrigeration evaporator 420 can provide cooling capacity for the refrigeration compartment of the refrigeration device, and the freezing evaporator 330 can provide cooling capacity for the freezer compartment of the refrigeration device.

[0089] The refrigeration system 1000 has the advantages of large cooling capacity and high COP due to the use of a double-suction compressor. By adding a gas-liquid separator 320 to separate the refrigerant into gas and liquid, the freezing evaporator 330 can operate in a full liquid state to meet the deep cooling capacity requirements. The refrigeration system 1000 is particularly suitable for products such as deep freezing refrigerators. Deep freezing refrigerators can reduce the freezing temperature to minus 40°C, or even below minus 60°C, making them suitable for storing food and precious ingredients.

[0090] Since the refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0091] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A refrigeration system, comprising: A compressor having a main air intake port, a secondary air intake port and an air discharge port; a condenser, the inlet of which is connected to the exhaust port; The first branch includes a gas-liquid separator, a first throttling member and a refrigeration evaporator, wherein the inlet of the gas-liquid separator is connected to the outlet of the condenser through the first throttling member, the liquid phase outlet of the gas-liquid separator is connected to the refrigeration evaporator, the gas phase outlet of the gas-liquid separator is connected to the auxiliary air intake port, and the outlet of the refrigeration evaporator is connected to the main air intake port; as well as The second branch includes a second throttling element and a refrigeration evaporator connected in series, the inlet of the second branch is connected to the outlet of the condenser, and the outlet of the second branch is connected to the auxiliary air intake port.

2. The refrigeration system according to claim 1, further comprising: A one-way valve is connected between the gas phase outlet and the auxiliary air intake port.

3. The refrigeration system according to claim 1 or 2, further comprising: A bypass branch, comprising a flow regulating member, one end of the flow regulating member is connected to the second branch, and the other end is connected to the main air intake port, the bypass branch is used to divert part of the refrigerant passing through the second branch to the main air intake port; as well as A control valve is used to control the opening and closing of the first branch and the second branch.

4. The refrigeration system according to claim 3, wherein: The flow regulating member is a stop valve, and the control valve and the stop valve are configured as follows: When the compartment corresponding to the freezing evaporator reaches the preset freezing temperature, the control valve is controlled to close the first branch and the stop valve is opened.

5. The refrigeration system according to claim 3 or 4, wherein: The flow regulating member is a capillary tube, one end of which is connected to the inlet of the second throttling member, the inlet of the refrigeration evaporator or the outlet of the refrigeration evaporator, and the other end is connected to the main air intake port.

6. The refrigeration system according to any one of claims 1 to 5, wherein: The first branch also includes a third throttling member, and the third throttling member is connected between the liquid phase outlet of the gas-liquid separator and the refrigeration evaporator.

7. The refrigeration system according to any one of claims 1 to 6, further comprising: A third branch, comprising a fourth throttling element and a temperature-variable evaporator connected in series, the inlet of the third branch being connected to the outlet of the condenser, and the outlet of the third branch being connected to the main air intake port; as well as A control valve is used to control the opening and closing of the first branch, the second branch and the third branch.

8. The refrigeration system according to claim 7, further comprising: The bypass branch includes a stop valve connected between the outlet of the refrigeration evaporator and the main air intake port; the control valve and the stop valve are configured as follows: When the compartment corresponding to the refrigeration evaporator reaches the preset freezing temperature, the control valve is controlled to close the first branch and the stop valve is opened; When the compartment corresponding to the variable temperature evaporator reaches the variable temperature preset temperature, the control valve is controlled to close the third branch and the stop valve is opened; or When the compartment corresponding to the freezing evaporator and the compartment corresponding to the temperature-variable evaporator both reach the preset temperature, the control valve is controlled to close the first branch and the third branch, and the stop valve is opened.

9. The refrigeration system according to claim 7 or 8, further comprising: The bypass branch comprises a capillary tube, one end of which is connected to the inlet of the second throttling member, the inlet of the refrigeration evaporator or the outlet of the refrigeration evaporator, and the other end is connected to the main air intake port.

10. A refrigeration device, comprising the refrigeration system according to any one of claims 1 to 9.

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