Refrigerating system and refrigerating equipment

Abstract

The invention discloses a refrigeration system and refrigeration equipment, and belongs to the technical field of refrigeration, the refrigeration system comprises a compressor, a condenser, a first branch and a second branch, and the compressor is provided with a main air suction port, an auxiliary air suction port and an exhaust port; a double-suction compressor is adopted, a gas-liquid separator is additionally arranged in a first branch, the compressor is communicated with a freezing evaporator through a main suction port, an exhaust port is communicated with a condenser, a refrigeration evaporator is connected with an auxiliary suction port, and a part of refrigerant enters the gas-liquid separator after being throttled by a first throttling element; the separated gaseous refrigerant enters the compressor through the auxiliary air suction port to be compressed, the liquid refrigerant is refrigerated through the freezing evaporator, the other part of refrigerant is refrigerated through the second branch, and double-suction refrigeration is achieved. As the freezing evaporator can operate in a full-liquid state, the refrigerating capacity can be greatly improved, the evaporation temperature is reduced, the operation efficiency of a refrigerating system is improved, and the refrigerating system is suitable for refrigerating equipment such as a cryogenic refrigerator.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and in particular to a refrigeration system and refrigeration equipment. Background Art

[0002] The compressor currently used in refrigerator products is a single-suction compressor, which is connected to the condenser, evaporator and other components to form a conventional single-suction series-parallel or pure parallel refrigeration system, which has the problem of low refrigeration capacity. In the related art, a double-suction compressor is used to replace the single-suction compressor. Although it has the advantage of large cooling capacity, due to the limitation of the conventional refrigeration circuit on the cooling capacity, the refrigeration temperature is difficult to meet the freezing requirements of the deep-freeze refrigerator. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a refrigeration system that can effectively increase the refrigeration capacity, improve the system operation efficiency and reduce the evaporation temperature.

[0004] The present invention also provides a refrigeration device using the refrigeration system.

[0005] A first aspect of an embodiment of the present invention provides a refrigeration system, including a compressor, a condenser, a first branch and a second branch, the compressor having a main air intake port, an auxiliary air intake port 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 port, and the outlet of the refrigeration evaporator is connected to the main air intake port; 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 port.

[0006] The refrigeration system according to the embodiment of the present invention has at least the following beneficial effects:

[0007] The refrigeration system adopts a double-suction compressor and adds a gas-liquid separator in the first branch. The compressor is connected to the freezing evaporator through the main suction port, and the exhaust port is connected to the condenser. At the same time, the refrigeration evaporator is connected to the auxiliary suction port. A part of the refrigerant enters the gas-liquid separator after throttling by the first throttling device. The separated gaseous refrigerant enters the compressor through the auxiliary suction port for compression. The liquid refrigerant passes through the freezing evaporator for refrigeration, and the other part of the refrigerant will pass through the second branch for refrigeration, realizing double-suction refrigeration. Since the freezing evaporator can operate in a full liquid state, it can greatly increase the cooling capacity, reduce the evaporation temperature and improve the operating efficiency of the refrigeration system, so that the freezing temperature can reach minus 40°C, or even below minus 60°C, which is suitable for refrigeration equipment such as deep-freeze refrigerators.

[0008] In some embodiments of the present invention, the refrigeration system further comprises:

[0009] A one-way valve is connected between the gas phase outlet and the auxiliary air intake port.

[0010] In some embodiments of the present invention, the refrigeration system further comprises:

[0011] 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;

[0012] A control valve is used to control the opening and closing of the first branch and the second branch.

[0013] In some embodiments of the present invention, the flow regulating member is a stop valve, and the control valve and the stop valve are configured as follows:

[0014] When the compartment corresponding to the refrigeration evaporator reaches a preset temperature, the control valve is controlled to close the first branch and the stop valve is opened.

[0015] In some embodiments of the present invention, 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.

[0016] In some embodiments of the present invention, 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.

[0017] In some embodiments of the present invention, the refrigeration system further comprises:

[0018] 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;

[0019] A control valve is used to control the opening and closing of the first branch, the second branch and the third branch.

[0020] In some embodiments of the present invention, the refrigeration system further comprises:

[0021] 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:

[0022] 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;

[0023] 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

[0024] 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.

[0025] In some embodiments of the present invention, the refrigeration system further comprises:

[0026] 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.

[0027] In some embodiments of the present invention, 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.

[0028] In some embodiments of the present invention, both the first throttling member and the second throttling member are capillaries.

[0029] A second aspect of an embodiment of the present invention provides a refrigeration device, comprising the refrigeration system described in the first aspect of the above embodiment.

[0030] The refrigeration device according to the embodiment of the present invention has at least the following beneficial effects:

[0031] The refrigeration equipment applies the refrigeration system of the above embodiment, and the refrigeration system can realize double-suction refrigeration. Since the freezing evaporator can operate in a full liquid state, the refrigeration capacity can be greatly increased, the evaporation temperature can be reduced and the operating efficiency of the refrigeration system can be improved, so that the freezing temperature can reach minus 40°C, or even below minus 60°C, meeting the requirements of a deep-freeze refrigerator.

[0032] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structural principle of the refrigeration system of the first embodiment of the present invention;

[0034] Figure 2 is a schematic diagram of the structural principle of a refrigeration system in a second embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of the structural principle of a refrigeration system in a third embodiment of the present invention;

[0036] Figure 4 is a schematic diagram of the structural principle of a refrigeration system in a fourth embodiment of the present invention;

[0037] Figure 5 is a schematic diagram of the structural principle of a refrigeration system in a fifth embodiment of the present invention;

[0038] Figure 6 It is a schematic diagram of the structural principle of a refrigeration system of the sixth embodiment of the present invention.

[0039] Reference numerals:

[0040] Compressor 100; main air intake port 110; auxiliary air intake port 120; exhaust port 130;

[0041] Condenser 200;

[0042] 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;

[0043] The second branch 400; the second throttle 410; the refrigeration evaporator 420;

[0044] Control valve 500;

[0045] Bypass branch 600; flow regulating member 610; stop valve 611; bypass capillary 612;

[0046] The third branch 700; the fourth throttling element 710; the variable temperature evaporator 720;

[0047] Refrigeration system 1000. DETAILED DESCRIPTION

[0048] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention 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 in the embodiments can be combined with each other without conflict.

[0049] Embodiments of the present invention are described in detail below, examples of which 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 invention, and cannot be understood as limiting the present invention.

[0050] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0051] In the description of the present invention, if described as "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.

[0052] In the description of the present invention, it should be noted that the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0053] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments.

[0054] Reference Figure 1 As shown, an embodiment of the present invention 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 circulation loop of the refrigerant.

[0055] 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.

[0056] Reference Figure 1 As shown, 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, wherein 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 port 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 port 110 of the compressor 100.

[0057] 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 port 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 refrigeration temperature, and improving the operating efficiency of the refrigeration system 1000.

[0058] 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 settle to the bottom of the separation chamber, thereby realizing the stratification and separation of the gas-phase refrigerant and the liquid-phase refrigerant.

[0059] Reference Figure 1 As shown, the second branch 400 includes a second throttling member 410 and a refrigerated evaporator 420. The second throttling member 410 is connected in series with the refrigerated evaporator 420. The second branch 400 works in parallel with the first branch 300, so that the freezing evaporator 330 and the refrigerated evaporator 420 can cool each other independently.

[0060] In some embodiments, one end of the second throttle 410 is connected to the condenser 200, and the other end is connected to the refrigeration evaporator 420, and the end of the refrigeration evaporator 420 away from the second throttle 410 is connected to the auxiliary air intake port 120 of the compressor 100, that is, 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 port 120. It can be understood that the freezing evaporator 330 is connected to the main air intake port 110, and the refrigeration evaporator 420 is connected to the auxiliary air intake port 120, so that the freezing evaporator 330 and the refrigeration evaporator 420 can operate together to achieve efficient refrigeration. Figure 1 The direction indicated by the arrow in the middle is the flow direction of the refrigerant in the refrigeration state.

[0061] Specifically, a refrigerator is used as an example for explanation. The refrigerator has a freezing chamber and a refrigerating chamber. The freezing evaporator 330 is arranged in the freezing chamber, and the refrigerating evaporator 420 is arranged in the refrigerating chamber. The refrigerating evaporator 420 can be a direct cooling evaporator or an air cooling evaporator. In this way, the freezing evaporator 330 and the refrigerating evaporator 420 can operate together to achieve efficient refrigeration. In this way, the refrigerator has freezing and refrigerating functions to meet the storage requirements of various items in different temperature ranges.

[0062] 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.

[0063] Reference Figure 1 As shown, in some embodiments, the first throttling member 310 and the second throttling member 410 are both capillaries, which have a throttling effect. 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 330 and the refrigerating evaporator 420 respectively for evaporation.

[0064] It is understandable that the adjustment of the evaporation temperature and evaporation pressure of the refrigeration system 1000 can be achieved by changing the length or inner diameter of the capillary tube. If the evaporation temperature is to be increased, the length of the capillary tube can be shortened or the inner diameter of the capillary tube can be increased; if the evaporation temperature is to be reduced, the length of the capillary tube can be lengthened or the inner diameter of the capillary tube can be reduced. In the embodiment, the length and inner diameter of the capillary tube are selected according to actual requirements.

[0065] Of course, this is only an example, and the first throttling member 310 and the second throttling member 410 are not limited to capillaries. In some embodiments, the first throttling member 310 and the second throttling 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.

[0066] It is understandable that for the refrigerant in the pipeline of the refrigeration system 1000, there is a problem of refrigerant dryness in the gas-liquid two-phase mixed state. The refrigerant dryness refers to the weight ratio of the refrigerant vapor in the wet saturated steam, that is, the ratio of the gaseous part in the refrigerant. The gaseous and liquid refrigerants can be separated by the gas-liquid separator 320, so that the refrigerant dryness can be reduced. It is understandable that the lower the dryness of the refrigerant, the less gaseous refrigerant, the more liquid refrigerant, and the better the refrigeration effect. Therefore, separating the liquid refrigerant and entering the freezing evaporator 330 for refrigeration can obtain a lower evaporation temperature.

[0067] 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 requirements of deep-freeze temperature. It has cell-level freezing technology, and the cold air reaches the cells directly without destroying them, so that they can be preserved for a long time. Moreover, deep-freeze refrigerator products can enable food to quickly pass through the ice crystal zone and reach a glassy storage state, so that food preservation is better.

[0068] In addition, the double suction compressor has the advantages of large cooling capacity and high refrigeration coefficient (COP, Coefficient Of Performance), which can ensure that the refrigerator has both deep cooling function and low energy consumption performance, and can realize double suction refrigeration, and the cooling capacity and energy efficiency are improved, and the operation efficiency of the refrigeration system 1000 is higher. The compressor 100 can be a piston compressor or a centrifugal compressor.

[0069] 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 independently arranged, 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. In one reciprocating stroke of the piston, four steps are included: 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 an improvement in COP.

[0070] Reference Figure 1 As shown, 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.

[0071] 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 allow the refrigerant to flow along the gas phase outlet 322 toward the secondary suction port 120 but not flow in the opposite direction.

[0072] Reference Figure 1 As shown, 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 be used to control one of the first branch 300 and the second branch 400 to be connected, and can control the first branch 300 and the second branch 400 to be connected at the same time.

[0073] 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 further realizing the connection of the electric valve with the condenser 200, the first branch 300 and the second branch 400.

[0074] Specifically, when the electric valve controls the second end b and the third end c to be turned on at the same time, the refrigerant can be diverted to the first branch 300 and the second branch 400 through the electric valve, so that the freezing evaporator 330 and the refrigerating evaporator 420 can refrigerate at the same time. When the freezing chamber reaches the preset freezing temperature, the electric valve can control the disconnection of the second end b and keep the third end c in the conducting state. At this time, the freezing evaporator 330 stops running and the refrigerating evaporator 420 continues to run until the refrigerating chamber reaches the preset refrigerating temperature.

[0075] Reference Figure 1 As shown, 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 refrigeration evaporator 330. The liquid refrigerant separated by the gas-liquid separator 320 enters the refrigeration 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 refrigeration evaporator 330.

[0076] In some embodiments, the third throttling member 350 is a capillary tube, which has a throttling function. After the liquid refrigerant passes through the capillary tube throttling, the evaporation temperature and evaporation pressure are further reduced to obtain a lower freezing temperature. The length and inner diameter of the capillary tube are adjusted according to actual requirements. Of course, this is only an example, and the third throttling member 350 is not limited to the capillary tube. The third throttling member 350 can also be an expansion valve or other throttling components.

[0077] It should be noted that Figure 1 In the illustrated embodiment, the first throttling member 310, the second throttling member 410 and the third throttling member 350 are all capillary tubes, which can reduce the cost of the refrigeration system 1000, reduce control differences, and help improve operational stability.

[0078] Reference Figure 2 As shown, Figure 2 The embodiment shown and Figure 1 The difference between the illustrated embodiments is that the refrigeration system 1000 also includes a bypass branch 600, which 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.

[0079] Let's take a specific example to illustrate. Figure 2The flow regulating member 610 of the illustrated embodiment is a stop valve 611. During refrigeration operation, the electric valve controls the first branch 300 and the second branch 400 to be turned on at the same time, and the refrigeration evaporator 420 and the freezing evaporator 330 are refrigerated respectively, and the stop valve 611 is controlled to be closed at the same time. When the refrigeration chamber reaches the preset refrigeration temperature, that is, the operation of the refrigeration evaporator 420 reaches the shutdown point. For example, the preset refrigeration temperature is 4°C. When the temperature of the refrigeration chamber drops to 4°C, the refrigeration evaporator 421 reaches the shutdown point. At this time, the second branch 400 is controlled to be closed and the first branch 300 is kept open. Since the gas phase outlet 322 is connected to the auxiliary air intake port 120, the gaseous refrigerant will continue to enter the compressor 100 for compression. That is to say, the main air intake port 110 and the auxiliary air intake port 120 can be kept running when the second branch 400 is closed.

[0080] When the freezer reaches the preset freezing temperature, the freezing evaporator 330 reaches the shutdown point while the refrigerated 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, and 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 refrigerated evaporator 420 and the main air intake port 110, the stop valve 611 is controlled to be opened at this time, so that a part of the refrigerant passing through the refrigerated evaporator 420 flows to the auxiliary air intake port 120, and the other part of the refrigerant flows to the main air intake port 110 through the bypass branch 600. Both the main air intake port 110 and the auxiliary air intake port 120 can work normally, so that the refrigerated evaporator 420 continues to operate until it reaches the shutdown point. For example, the preset freezing temperature is minus 40°C, and the preset refrigerating 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 refrigerating evaporator 420 continues to maintain refrigeration until the temperature of the refrigerating compartment reaches 4°C.

[0081] Understandably, Figure 1 In the illustrated embodiment, when the compressor 100 has not reached the shutdown point and there is no bypass branch 600, closing the first branch 300 will cause the main air intake port 110 to be closed, affecting the operational stability of the compressor 100, and thus there is a problem that the main air intake port 110 cannot be closed alone. Based on this, by adding a bypass branch 600 and cooperating with the electric valve, it can be achieved that when the refrigeration evaporator 330 reaches the shutdown point, the electric valve is controlled to close the first branch 300 and open the stop valve 611, so that the refrigeration evaporator 420 can continue to operate without affecting the operation of the main air intake port 110, effectively solving the problem that the main air intake port 110 cannot be closed alone.

[0082] Reference Figure 3 As shown, Figure 3The flow regulating member 610 of the illustrated embodiment 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 and the main air intake port 110 through the bypass capillary tube 612. It can be understood that, relative to the stop valve 611, the bypass capillary tube 612 can keep the bypass branch 600 in a conducting state, so that during the operation of the refrigeration evaporator 420, a certain flow of refrigerant will be maintained to flow to the main air intake port 110, and the overall operating efficiency of the refrigeration system 1000 is slightly lower than Figure 2 In the embodiment shown, the bypass capillary 612 can reduce system cost and control difference, and the control cost is also low, which is more conducive to production application.

[0083] It should be noted that this is only an example, and the bypass capillary 612 is not limited to being connected between the outlet of the refrigerated evaporator 420 and the main air intake port 110 , and the inlet of the bypass capillary 612 may also be connected between the electric valve and the second throttling device 410 , or between the second throttling device 410 and the refrigerated evaporator 420 . For example, one end of the bypass capillary 612 is connected to the outlet of the second throttling device 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 device 410, a part of the refrigerant will pass through the refrigeration evaporator 420 for refrigeration, and then flow to the auxiliary air intake port 120; the other part of the refrigerant will flow to the main air intake port 110 through the bypass capillary 612, so that the main air intake port 110 and the auxiliary air intake port 120 can both 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.

[0084] Reference Figure 4 As shown, Figure 4 The embodiment shown and Figure 1 The difference between the illustrated embodiments is that the refrigeration system 1000 also includes a third branch 700, the third branch 700 includes a fourth throttling device 710 and a variable temperature evaporator 720, one end of the fourth throttling device 710 is connected to the control valve 500, and the other end of the fourth throttling device 710 is connected to the variable temperature evaporator 720, and the variable temperature 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.

[0085] 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 operate 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 independently realize precise control of refrigeration without being affected by other branches, and have higher operating efficiency.

[0086] 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.

[0087] It is understandable that the variable temperature evaporator 720 is suitable for a refrigerator with a variable temperature chamber. The variable temperature evaporator 720 is arranged in the variable temperature chamber. The variable temperature chamber can increase the storage requirements of the refrigerator for various types of food in different temperature ranges. The variable temperature evaporator 720 can be a direct cooling evaporator or an air cooling evaporator. When the variable temperature chamber reaches the preset temperature of the variable temperature, the variable temperature evaporator 720 reaches the shutdown point, and the third branch 700 can be closed by the electric valve control.

[0088] Reference Figure 4 As shown, when the freezing evaporator 330 reaches the shutdown point, the electric valve can control the closure of the first branch 300 to keep the refrigerated evaporator 420 and the variable temperature evaporator 720 running; when the refrigerated 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 variable temperature evaporator 720 running; considering that the compressor 100 needs to keep the main air intake port 110 in the air intake working state before reaching the shutdown point, at least one of the first branch 300 and the third branch 700 can be controlled to keep running through the electric valve.

[0089] In some embodiments, the fourth throttling member 710 is a capillary tube, and the fourth throttling member 710 is used to reduce the evaporation temperature and evaporation pressure of the variable temperature evaporator 720, and the length and inner diameter of the capillary tube are adjusted according to actual requirements. Of course, this is only an example, and the fourth throttling member 710 is not limited to the capillary tube, and the fourth throttling member 710 can also be an expansion valve or other throttling components.

[0090] Reference Figure 5 As shown, Figure 5 The embodiment shown and Figure 4The difference between the illustrated embodiments is that the refrigeration system 1000 also includes a bypass branch 600, which includes a flow regulating component 610, and 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 refrigeration evaporator 420 can be diverted to the main air intake port 110 through the bypass branch 600.

[0091] Figure 5 The flow regulating member 610 of the illustrated embodiment is a stop valve 611. During refrigeration operation, the electric valve controls the first branch 300, the second branch 400 and the third branch 700 to be turned on at the same time, and the refrigeration evaporator 420, the freezing evaporator 330 and the temperature-variable evaporator 720 are refrigerated respectively, and the stop valve 611 is controlled to be closed. When the refrigeration evaporator 420 reaches the shutdown point, the second branch 400 is controlled to be closed, and the temperature-variable evaporator 720 and the freezing evaporator 330 continue to operate. Since the gas phase outlet 322 is connected to the auxiliary air intake port 120, the gaseous refrigerant will enter the compressor 100 through the auxiliary air intake port 120, that is, the main air intake port 110 and the auxiliary air intake port 120 can be kept in operation when the second branch 400 is closed.

[0092] When the freezing evaporator 330 and the variable temperature evaporator 720 both reach the shutdown point and the refrigerated 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 be opened, so that a part of the refrigerant passing through the refrigerated evaporator 420 flows to the auxiliary air intake port 120, and the other part of the refrigerant flows to the main air intake port 110 through the bypass branch 600. The main air intake port 110 and the auxiliary air intake port 120 can both work normally. In this way, the refrigerated evaporator 420 continues to operate until it reaches the shutdown point, which can solve the problem that the main air intake port 110 cannot be closed alone.

[0093] Of course, in some embodiments, when the freezing chamber 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 part 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.

[0094] 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, and 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, and the operating efficiency of the compressor 100 can also be improved.

[0095] Reference Figure 6 As shown, Figure 6 The flow regulating member 610 of the illustrated embodiment is a bypass capillary tube 612, and the bypass branch 600 connects the outlet of the refrigeration evaporator 420 and the main air intake port 110 through the bypass capillary tube 612. During the operation of the refrigeration evaporator 420, the bypass capillary tube 612 will maintain a certain flow of refrigerant flowing to the main air intake port 110. The bypass capillary tube 612 can reduce system costs and control differences, and the control cost is also low, which is more conducive to production applications.

[0096] It should be noted that Figure 3 and Figure 6 In the illustrated embodiment, the length and inner diameter of the bypass capillary 612 of the bypass branch 600 can satisfy the requirements of maintaining a portion of the refrigerant flowing to the main air intake port 110, and a certain flow of refrigerant can pass through the refrigeration evaporator 420 on the second branch 400, ensuring that the refrigeration evaporator 420 can continue to operate 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.

[0097] The embodiment of the present invention further provides a refrigeration device, which includes the refrigeration system 1000 of the above embodiment. The refrigeration device can be a refrigerator, a freezer, etc., and can be a deep freezer. The refrigeration evaporator 420 can provide refrigeration capacity for the refrigeration chamber of the refrigeration device, and the freezing evaporator 330 can provide refrigeration capacity for the freezing chamber of the refrigeration device.

[0098] 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 refrigeration capacity requirements of deep freezing. The refrigeration system 1000 is particularly suitable for products such as deep freezing refrigerators. Deep freezing refrigerators can make the freezing temperature reach minus 40°C, or even below minus 60°C, and are suitable for storing food and precious ingredients.

[0099] Since the refrigeration device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0100] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A refrigeration system, characterized in that: include: 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; 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, characterized in that: The refrigeration system further comprises: 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, characterized in that: The refrigeration system further comprises: 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; 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, characterized in that: 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, characterized in that: 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 claim 1, characterized in that: 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 claim 1, characterized in that: The refrigeration system further comprises: A third branch, comprising a fourth throttling element and a temperature-variable evaporator connected in series, wherein 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; 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, characterized in that: The refrigeration system further comprises: 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, characterized in that: The refrigeration system further comprises: 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, characterized in that: Comprising a refrigeration system as claimed in any one of claims 1 to 9.

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