Refrigeration system and refrigeration device

Abstract

The present application discloses a refrigeration system and a refrigeration device. The refrigeration system comprises a compressor (100), a condenser (200), a first branch (300), a second branch (400), a bypass branch (500), and a control valve (600). The compressor (100) is provided with a main air suction port (110), an auxiliary air suction port (120), and an air discharge port (130); an inlet of the condenser (200) is connected to the air discharge port (130); the first branch (300) comprises a first throttling element (310) and a first evaporator (320) connected in series; the second branch (400) comprises a second throttling element (410) and a second evaporator (420) connected in series; the control valve (600) is used for controlling the connection and disconnection of the first branch (300) and the second branch (400); and the bypass branch (500) comprises a flow adjustment member (510).

Description

Refrigeration systems and refrigeration equipment Technical Field

[0001] This application claims priority to Chinese patent application number 202311459852.2, 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 to form 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 this can improve cooling capacity to a certain extent, when the refrigeration system needs to be shut down for temperature control, the main suction port of the double-suction compressor is closed, which adversely affects compressor reliability. This also makes it impossible to close the main suction port independently.

[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, a second branch, a bypass branch and a control valve, wherein the compressor has a main intake port, a secondary intake port and an exhaust port; the inlet of the condenser is connected to the exhaust port; the first branch includes a first throttling device and a first evaporator connected in series, the inlet of the first branch is connected to the outlet of the condenser, and the outlet of the first branch is connected to the main intake port; the second branch includes a second throttling device and a second 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 secondary intake port; the control valve is used to control the on and off of the first branch and the second branch; the bypass branch includes a flow regulating device, one end of the flow regulating device is connected to the second branch, and the other end is connected to the main intake port, and the bypass branch is used to divert part of the refrigerant passing through the second branch to the main intake port.

[0008] In some embodiments of the present application, the first evaporator is a freezing evaporator, the second evaporator is a refrigeration evaporator, the flow regulating member is connected between the outlet of the refrigeration evaporator and the main air intake, the flow regulating member is a stop valve, and the control valve and the stop valve are configured to control the control valve to close the first branch and open the stop valve when the compartment corresponding to the freezing evaporator reaches the preset freezing temperature.

[0009] In some embodiments of the present application, the control valve is further configured to: when the compartment corresponding to the refrigeration evaporator reaches a preset refrigeration temperature, control the control valve to close the second branch.

[0010] 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 second evaporator or the outlet of the second evaporator, and the other end is connected to the main air intake port.

[0011] In some embodiments of the present application, the control valve is an electric valve, and the control valve is an electric valve. The electric valve is provided with a first end, a second end and a third end, the first end is connected to the outlet of the condenser, the second end is connected to the inlet of the first branch, and the third end is connected to the inlet of the second branch.

[0012] In some embodiments of the present application, the first evaporator is a freezing evaporator, the second evaporator is a refrigeration evaporator, and the refrigeration system also includes a third branch, the third branch includes a third throttling device and a temperature-variable 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 port, and the control valve is also used to control the on and off of the third branch.

[0013] 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 control the control valve to close the first branch and the third branch and open the stop valve when the compartment corresponding to the refrigeration evaporator and the compartment corresponding to the temperature variable evaporator both reach a preset temperature.

[0014] 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.

[0015] In some embodiments of the present application, the first throttling member, the second throttling member, and the third throttling member are all capillaries.

[0016] In some embodiments of the present application, the control valve is an electric valve, which is provided with a first end, a second end, a third end and a fourth end, the first end being connected to the outlet of the condenser, the second end being connected to the inlet of the first branch, the third end being connected to the inlet of the second branch, and the fourth end being connected to the inlet of the third branch.

[0017] 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.

[0018] 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

[0019] FIG1 is a schematic diagram of the structural principle of a refrigeration system in a first embodiment of the present application;

[0020] FIG2 is a schematic diagram of the structural principle of a refrigeration system in a second embodiment of the present application;

[0021] FIG3 is a schematic diagram of the structural principle of a refrigeration system in a third embodiment of the present application;

[0022] FIG4 is a schematic diagram of the structural principle of a refrigeration system in a fourth embodiment of the present application; and

[0023] FIG5 is a schematic diagram showing the structural principle of a refrigeration system according to a fifth embodiment of the present application.

[0024] Reference numerals:

[0025] Compressor 100; main air intake 110; auxiliary air intake 120; exhaust port 130;

[0026] Condenser 200;

[0027] First branch 300; first throttle 310; first evaporator 320; refrigeration evaporator 321;

[0028] Second branch 400; second throttle 410; second evaporator 420; refrigeration evaporator 421;

[0029] Bypass branch 500; flow regulating member 510; stop valve 511; bypass capillary tube 512;

[0030] Control valve 600;

[0031] The third branch 700; the third throttle 710; the temperature-variable evaporator 720;

[0032] Refrigeration system 1000. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] In the description of this application, it should be understood that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0036] In the description of this application, the use of terms such as "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed 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. Unless otherwise specified, "plurality" means two or more.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] As shown in FIG1 , the first branch 300 includes a first throttle member 310 and a first evaporator 320. The first throttle member 310 and the first evaporator 320 are connected in series. The inlet of the first throttle member 310 is connected to the outlet of the condenser 200, the outlet of the first evaporator 320 is connected to the main air intake port 110, and the inlet of the condenser 200 is connected to the exhaust port 130. The first evaporator 320 is a freezing evaporator 321. The inlet of the first throttle member 310 can be understood as the inlet of the first branch 300, and the outlet of the freezing evaporator 321 can be understood as the outlet of the first branch 300. After passing through the condenser 200, the refrigerant is split. A portion of the refrigerant enters the first branch 300, is first throttled by the first throttle member 310, and then evaporates in the freezing evaporator 321. Finally, it flows into the main air intake port 110 for compression, thereby achieving refrigeration in the freezing evaporator 321.

[0042] As shown in FIG1 , the second branch 400 includes a second throttle member 410 and a second evaporator 420. The second throttle member 410 and the second evaporator 420 are connected in series. The inlet of the second throttle member 410 is connected to the outlet of the condenser 200, and the outlet of the second evaporator 420 is connected to the auxiliary air intake port 120. The second evaporator 420 is a refrigerated evaporator 421. The inlet of the second throttle member 410 can be understood as the inlet of the second branch 400, and the outlet of the refrigerated evaporator 421 can be understood as the outlet of the second branch 400. After passing through the condenser 200, the refrigerant is split. Another portion of the refrigerant enters the second branch 400, is first throttled by the second throttle member 410, evaporates in the refrigerated evaporator 421, and finally flows into the compressor 100 through the auxiliary air intake port 120 for compression, thereby achieving refrigeration in the refrigerated evaporator 421. The direction indicated by the arrow in FIG1 represents the flow direction of the refrigerant in the cooling state.

[0043] It is understood that the double-suction compressor has the advantages of large cooling capacity and high coefficient of performance (COP). Since the freezing evaporator 321 is connected to the main air intake port 110 and the refrigeration evaporator 421 is connected to the auxiliary air intake port 120, the freezing evaporator 321 and the refrigeration evaporator 421 can operate together, achieving efficient double-suction refrigeration, improving cooling capacity and energy efficiency, and improving the operating efficiency of the refrigeration system 1000. The compressor 100 can specifically be a piston compressor or a centrifugal compressor.

[0044] For example, a refrigerator includes a freezer compartment and a refrigerator compartment. A freezing evaporator 321 is located in the freezer compartment, while a refrigerator evaporator 421 is located in the refrigerator compartment. Both freezing evaporator 321 and refrigerator evaporator 421 can be direct-cooling evaporators or air-cooling evaporators. During cooling, freezing evaporator 321 and refrigerator evaporator 421 operate simultaneously, allowing the freezer compartment and refrigerator compartment to be cooled rapidly and independently, meeting both freezing and cooling requirements of the refrigerator.

[0045] Considering that the freezing temperature of refrigerators using single-suction compressors in the related art is usually between -18°C and 24°C, it 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; the refrigeration system 1000 of the above embodiment can be applied to deep-freeze refrigerators (also called deep-freeze refrigerators). By adopting a double-suction compressor, the cooling capacity can be effectively increased to meet the cooling capacity requirements of deep-freeze refrigerators, so that the freezing temperature can reach -40°C, or even below -60°C, meeting the requirements of deep-freeze temperature, taking into account both deep-freeze function and low energy consumption performance.

[0046] 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, wherein 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. Taking the piston compressor as an example, 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.

[0047] In addition, this is only an example. The first evaporator 320 is not limited to being a freezing evaporator 321, and the second evaporator 420 is not limited to being a refrigeration evaporator 421. In some embodiments, the first evaporator 320 and the second evaporator 420 can both be freezing evaporators 321 or refrigeration evaporators 421, or the first evaporator 320 can be a refrigeration evaporator 421 and the second evaporator 420 can be a freezing evaporator 321. The specific selection is based on actual application requirements.

[0048] As shown in Figure 1, in some embodiments, the refrigeration system 1000 also includes a control valve 600, which is respectively connected to the condenser 200, the first branch 300 and the second branch 400. The control valve 600 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, thereby realizing the switching of the freezing branch and the refrigeration branch.

[0049] Specifically, the control valve 600 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, thereby realizing the connection between the electric valve and the condenser 200, the first branch 300 and the second branch 400.

[0050] It will be appreciated that 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, enabling the freezing evaporator 321 and the refrigerating evaporator 421 to operate simultaneously. When the freezing compartment reaches a preset freezing temperature, the electric valve can be controlled to disconnect the second end b and maintain the third end c in a conductive state. At this time, the freezing evaporator 321 stops operating, while the refrigerating evaporator 421 continues operating until the refrigerating compartment reaches the preset refrigerating temperature.

[0051] As shown in Figure 1, in some embodiments, the first throttling member 310 and the second throttling member 410 are both capillaries, which have a throttling function. The high-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure refrigerant after passing through the capillary throttling, so that the refrigerant enters the freezing evaporator 321 and the refrigeration evaporator 421 respectively for evaporation.

[0052] 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.

[0053] 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. For example, the first throttle member 310 is a capillary tube and the second throttle member 410 is an expansion valve.

[0054] As shown in Figure 1, the refrigeration system 1000 also includes a bypass branch 500, which includes a flow regulating component 510. The flow regulating component 510 is connected between the outlet of the refrigeration evaporator 421 and the main air intake port 110. The refrigerant passing through the refrigeration evaporator 421 can be diverted to the main air intake port 110 through the bypass branch 500. The flow regulating component 510 is used to adjust the refrigerant flow of the bypass branch 500. The flow regulating component 510 can be a flow valve or a throttling component, such as an electronic expansion valve, a flow control valve, a capillary tube, etc.

[0055] To illustrate with a specific example, the flow regulating element 510 in the embodiment shown in FIG1 is a shut-off valve 511. During refrigeration operation, the electric valve controls the first branch 300 and the second branch 400 to be simultaneously open, allowing the refrigeration evaporator 421 and the freezing evaporator 321 to cool respectively, while simultaneously controlling the shut-off valve 511 to be closed. When the refrigeration compartment reaches the preset refrigeration temperature, that is, when the refrigeration evaporator 421 reaches the shutdown point, the second branch 400 is controlled to be closed while the first branch 300 remains open, allowing the freezing evaporator 321 to continue operating and keeping the shut-off valve 511 closed. For example, if the preset refrigeration temperature is 4°C, when the refrigeration compartment temperature drops to 4°C, the refrigeration evaporator 421 reaches the shutdown point. It can be understood that when the refrigeration evaporator 421 reaches the shutdown point and the freezing evaporator 321 has not reached the shutdown point, the refrigerant will continue to enter the compressor 100 through the main intake port 110 for compression, and the main intake port 110 can be kept running alone when the second branch 400 is closed.

[0056] As shown in Figure 1, when the freezing evaporator 321 reaches its shutdown point, while the refrigerating evaporator 421 has not, the first branch 300 is controlled to close and the second branch 400 remains open. Since a bypass branch 500 is provided between the outlet of the refrigerating evaporator 421 and the main air intake 110, the shut-off valve 511 is controlled to open, allowing a portion of the refrigerant passing through the refrigerating evaporator 421 to flow to the auxiliary air intake 120, while the remaining portion of the refrigerant flows through the bypass branch 500 to the main air intake 110. Both the main air intake 110 and the auxiliary air intake 120 can operate normally, allowing the refrigerating evaporator 421 to continue operating until it reaches its shutdown point. For example, if the preset freezing temperature is -40°C and the preset refrigerating temperature is 4°C, when the freezer compartment temperature drops to -40°C, the freezing evaporator 321 reaches its shutdown point, while the refrigerating evaporator 421, which has not yet reached its shutdown point, continues to refrigerate until the refrigerated compartment temperature reaches 4°C.

[0057] It should be noted that, considering that in the related art, if the compressor 100 has not reached its shutdown point and there is no bypass branch 500, closing the first branch 300 will cause the main air intake 110 to close, affecting the operating stability of the compressor 100 and adversely affecting the operating efficiency of the refrigeration system 1000, there is a problem that the main air intake 110 cannot be closed independently. As a result, when the freezing evaporator 321 reaches its shutdown point but the refrigeration evaporator 421 has not, the freezing compartment will continue to remain at a low temperature, resulting in unbalanced liquid distribution. In other words, without the bypass branch 500, the first branch 300 cannot be closed independently.

[0058] Based on this, the embodiment of the present application can achieve this by adding a bypass branch 500 and cooperating with an electric valve. When the refrigeration evaporator 321 reaches the shutdown point, the electric valve is controlled to close the first branch 300 and open the stop valve 511, and the refrigerant is diverted to the main air intake port 110 through the bypass branch 500, so that the refrigeration evaporator 421 can continue to operate and the main air intake port 110 can operate normally, effectively solving the problem that the main air intake port 110 in the double-intake compressor 100 cannot be closed alone.

[0059] 2 , the flow regulating member 510 of the embodiment shown in FIG2 is a capillary tube, which can be understood as a bypass capillary tube 512. That is, the bypass branch 500 connects the outlet of the refrigeration evaporator 421 with the main air intake 110 via the bypass capillary tube 512. Compared to the bypass branch 500 employing a shut-off valve 511, the bypass capillary tube 512 can maintain the bypass branch 500 in a conductive state. Therefore, during the operation of the refrigeration evaporator 421, a certain flow of refrigerant is maintained to flow to the main air intake 110. The overall operating efficiency of the refrigeration system 1000 is slightly lower than that of the embodiment shown in FIG1 . However, the bypass capillary tube 512 can reduce system costs and control differences, resulting in lower control costs and greater advantages for production applications.

[0060] Of course, this is just an example. The bypass capillary 512 is not limited to being connected between the outlet of the refrigerated evaporator 421 and the main air intake 110. The inlet of the bypass capillary 512 can also be connected between the electric valve and the second throttle 410, or between the second throttle 410 and the refrigerated evaporator 421. For example, as shown in Figure 3, one end of the bypass capillary 512 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 321 reaches the shutdown point, the electric valve controls the closure 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 421 for refrigeration, and then flow to the auxiliary air intake port 120; the other part of the refrigerant will pass through the bypass capillary 512 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 421 to continue to operate until it reaches the shutdown point.

[0061] As shown in Figure 4, the difference between the embodiment shown in Figure 4 and the embodiment shown in Figure 1 is that the refrigeration system 1000 also includes a third branch 700, the third branch 700 includes a third throttling member 710 and a temperature-variable evaporator 720, one end of the third throttling member 710 is connected to the control valve 600, and the other end of the third throttling member 710 is connected to the temperature-variable evaporator 720, and the temperature-variable evaporator 720 is connected to the main air intake 110, that is, the third branch 700 is connected in parallel with the first branch 300.

[0062] It can be understood that the control valve 600 in the embodiment 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 of the branches to be turned on, or two branches to be turned on, or all three branches to be turned on, that is, the freezing evaporator 321, the refrigeration evaporator 421 and the temperature-variable evaporator 720 run refrigeration at the same time to achieve efficient refrigeration; the freezing evaporator 321, the refrigeration evaporator 421 and the temperature-variable evaporator 720 are independent of each other, and can independently achieve precise control of refrigeration without being affected by other branches, and have higher operating efficiency.

[0063] Specifically, the electric valve is also provided with a fourth end d, which is connected to the inlet of the third 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.

[0064] It can be understood that the variable temperature evaporator 720 is suitable for a refrigerator with a variable temperature compartment. The variable temperature evaporator 720 is arranged in the variable temperature compartment. The variable temperature compartment can increase the refrigerator's storage requirements for various types of food in different temperature ranges. The variable temperature evaporator 720 can be a direct cooling evaporator or an air-cooled evaporator.

[0065] In the embodiment shown in Figure 4 , the flow regulating member 510 is a stop valve 511. During cooling 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 421, the freezing evaporator 321, and the temperature-variable evaporator 720 to cool, respectively, while simultaneously controlling the stop valve 511 to be closed.

[0066] As shown in Figure 4, when the freezing evaporator 321 reaches the shutdown point, the electric valve can control the closure of the first branch 300, keeping the refrigeration evaporator 421 and the temperature-variable evaporator 720 continuing to operate; when the refrigeration evaporator 421 reaches the shutdown point, the electric valve can control the closure of the second branch 400, keeping the freezing evaporator 321 and the temperature-variable evaporator 720 continuing to operate.

[0067] Since a bypass branch 500 is provided between the outlet of the refrigerated evaporator 421 and the main air intake 110, when the freezing evaporator 321 and the temperature-variable evaporator 720 both reach the shutdown point, the first branch 300 and the third branch 700 can be controlled to close, and the stop valve 511 can be opened to divert the refrigerant to the main air intake 110 through the bypass branch 500, so that the refrigerated evaporator 421 can continue to operate and the main air intake 110 can be kept in normal operation, effectively solving the problem that the main air intake 110 cannot be closed alone.

[0068] In some embodiments, the third throttle member 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 third throttle member 710 is not limited to a capillary tube; it can also be an expansion valve or other throttling component.

[0069] 5 , the flow regulating member 510 of the embodiment shown in FIG5 is a bypass capillary tube 512. The bypass branch 500 connects the outlet of the refrigeration evaporator 421 with the main air intake port 110 via the bypass capillary tube 512. During operation of the refrigeration evaporator 421, the bypass capillary tube 512 maintains a certain flow rate of refrigerant flowing to the main air intake port 110. The bypass capillary tube 512 can reduce system costs and control variations, resulting in low control costs and greater advantages for production applications.

[0070] Of course, this is just an example. The inlet of the bypass capillary 512 is not limited to being connected to the outlet of the refrigerated evaporator 421. It 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 421. For details, please refer to the connection structure of the embodiment shown in Figure 3.

[0071] It should be noted that in the embodiments shown in Figures 2, 3 and 5, the length and inner diameter of the bypass capillary 512 of the bypass branch 500 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 421 on the second branch 400, ensuring that the refrigerated evaporator 421 can continue to operate for refrigeration when the first branch 300 is closed. The specific length and inner diameter of the bypass capillary 512 can be selected according to actual requirements.

[0072] It should be noted that in the embodiment of the present application, the first throttling member 310, the second throttling member 410 and the third throttling member 710 all adopt capillary tubes, which can reduce the cost of the refrigeration system 1000, reduce control differences, and help improve operational stability.

[0073] The air in the condenser is then directed to the second evaporator, which is a container that is vented to the condenser so that the refrigerant is directed to the first evaporator and the second evaporator, and the container is vented to the condenser so that the refrigerant is directed to the second evaporator.

[0074] An embodiment of the present application also provides a refrigeration device, comprising the refrigeration system 1000 of the above embodiment. The refrigeration device may be a refrigerator, a freezer, or the like, and may specifically be a cryogenic refrigerator. The refrigeration evaporator 421 can provide cooling capacity for the refrigeration compartment of the refrigeration device, and the freezing evaporator 321 can provide cooling capacity for the freezer compartment of the refrigeration device.

[0075] Refrigeration system 1000, due to its use of a double-suction compressor, has the advantages of large cooling capacity and high COP. The freezing evaporator 321 and the refrigeration evaporator 421 can operate together, enabling efficient double-suction refrigeration. This improves cooling capacity and energy efficiency, meeting the cooling capacity requirements of deep-freeze refrigerators. Refrigeration system 1000 is particularly suitable for products such as deep-freeze refrigerators, suitable for storing food and precious ingredients. By adding a bypass branch 500 between the second branch 400 and the main air intake 110, the first branch 300 can be controlled to close via a control valve 600 when the freezing evaporator 321 reaches its shutdown point. The bypass branch 500, via a flow regulating member 510, diverts the refrigerant from the second branch 400 to the main air intake 110, effectively resolving the problem of the main air intake 110 being unable to be closed independently and improving the operating efficiency of refrigeration system 1000.

[0076] 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.

[0077] 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; A first branch includes a first throttling element and a first evaporator connected in series, an inlet of the first branch is connected to an outlet of the condenser, and an outlet of the first branch is connected to the main air intake port; A second branch, comprising a second throttling element and a second evaporator connected in series, an inlet of the second branch connected to an outlet of the condenser, and an outlet of the second branch connected to the auxiliary air intake port; A control valve, used to control the opening and closing of the first branch and the second branch; as well as The bypass branch includes a flow regulating member, one end of which 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.

2. The refrigeration system according to claim 1, wherein: The first evaporator is a freezing evaporator, the second evaporator is a refrigerating evaporator, the flow regulating component is connected between the outlet of the refrigerating evaporator and the main air intake port, the flow regulating component is a stop valve, and the control valve and the stop valve are configured to control the control valve to close the first branch and open the stop valve when the compartment corresponding to the freezing evaporator reaches a preset freezing temperature.

3. The refrigeration system according to claim 2, wherein: The control valve is further configured to control the control valve to close the second branch when the compartment corresponding to the refrigeration evaporator reaches a preset refrigeration temperature.

4. The refrigeration system according to any one of claims 1 to 3, 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 second evaporator or the outlet of the second evaporator, and the other end of which is connected to the main air intake port.

5. The refrigeration system according to any one of claims 1 to 4, wherein: The control valve is an electric valve, which is provided with a first end, a second end and a third end. The first end is connected to the outlet of the condenser, the second end is connected to the inlet of the first branch, and the third end is connected to the inlet of the second branch.

6. The refrigeration system according to any one of claims 1 to 5, wherein: The first evaporator is a freezing evaporator, the second evaporator is a refrigeration evaporator, and the refrigeration system further comprises: The third branch includes a third 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 port. The control valve is also used to control the on-off of the third branch.

7. The refrigeration system according to claim 6, wherein: The flow regulating member is a stop valve, and the control valve and the stop valve are configured to control the control valve to close the first branch and the third branch and open the stop valve when the compartment corresponding to the refrigeration evaporator and the compartment corresponding to the temperature variable evaporator both reach a preset temperature.

8. The refrigeration system according to claim 6 or 7, 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.

9. The refrigeration system according to any one of claims 6 to 8, wherein: The first throttling member, the second throttling member and the third throttling member are all capillaries.

10. The refrigeration system according to any one of claims 6 to 9, wherein: The control valve is an electric valve, which is provided with a first end, a second end, a third end and a fourth end. The first end is connected to the outlet of the condenser, the second end is connected to the inlet of the first branch, the third end is connected to the inlet of the second branch, and the fourth end is connected to the inlet of the third branch.

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

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