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, a second branch, a bypass branch and a control valve, in the first branch, a refrigerant enters the first evaporator for refrigeration after being throttled by the first throttling element; in the second branch, the refrigerant enters the second evaporator for refrigeration after being throttled by the second throttling element; the main air suction port and the auxiliary air suction port can suck air for compression, and the refrigerating capacity is improved. By additionally arranging the bypass branch on the second branch, the first branch can be closed through the control valve when the first evaporator reaches a stop point, and the bypass branch shunts a refrigerant on the second branch to the main air suction port through the flow adjusting piece, so that the main air suction port keeps stable operation, and the problem that the main air suction port cannot be independently closed is effectively solved; the operation efficiency of the refrigerating system is improved.

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 can increase the refrigeration capacity to a certain extent, when the refrigeration system needs to be shut down to control the temperature, the main suction port of the double-suction compressor is closed, which will have an adverse effect on the reliability of the compressor, and there is a problem that the main suction port cannot be closed alone. 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 and solve the problem that the main air intake port cannot be closed independently.

[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, a second branch, a bypass branch and a control valve, wherein the compressor has a main suction port, a secondary suction 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 suction 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 suction 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 suction port, and the bypass branch is used to divert part of the refrigerant passing through the second branch to the main suction 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. The compressor is connected to the inlet of the condenser through the exhaust port, so that the refrigerant flows to the first branch and the second branch respectively after passing through the condenser. In the first branch, the refrigerant is throttled by the first throttling device and enters the first evaporator for refrigeration, and enters the compressor through the main suction port after passing through the first evaporator; in the second branch, the refrigerant is throttled by the second throttling device and enters the second evaporator for refrigeration, and enters the compressor through the auxiliary suction port after passing through the second evaporator, so that the main suction port and the auxiliary suction port can both inhale air for compression, thereby increasing the refrigeration capacity; by adding a bypass branch between the second branch and the main suction port, the first branch can be closed by the control valve when the first evaporator reaches the shutdown point, and the bypass branch will divert part of the refrigerant passing through the second branch to the main suction port through the flow regulating device, so that the main suction port maintains stable operation, effectively solving the problem that the main suction port cannot be closed alone, and improving the operation efficiency of the refrigeration system.

[0008] In some embodiments of the present invention, the first evaporator is a freezing evaporator, the second evaporator is a refrigerating evaporator, the flow regulating member is connected between the outlet of the refrigerating evaporator and the main air intake port, 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 a preset freezing temperature.

[0009] In some embodiments of the present invention, 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.

[0010] 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 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 invention, 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 invention, the first evaporator is a freezing evaporator, the second evaporator is a refrigeration evaporator, and the refrigeration system further comprises:

[0013] 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.

[0014] 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 to control the control valve to close the first branch and the third branch and open the stop valve when the chamber corresponding to the refrigeration evaporator and the chamber corresponding to the temperature variable evaporator both reach a preset temperature.

[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 throttling member, the second throttling member and the third throttling member are all capillaries.

[0017] In some embodiments of the present invention, 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.

[0018] 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.

[0019] The refrigeration device according to the embodiment of the present invention has at least the following beneficial effects:

[0020] The refrigeration equipment applies the refrigeration system of the above embodiment, and the refrigeration system can realize double-suction refrigeration and improve the refrigeration capacity; by adding a bypass branch between the second branch and the main air intake port, the first branch can be closed by a control valve when the refrigeration evaporator reaches the shutdown point, and the bypass branch can divert part of the refrigerant passing through the second branch to the main air intake port through the flow regulating component, effectively solving the problem that the main air intake port cannot be closed alone, thereby improving the operating efficiency of the refrigeration system.

[0021] 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

[0022] Figure 1 It is a schematic diagram of the structural principle of the refrigeration system of the first embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the structural principle of a refrigeration system in a second embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of the structural principle of a refrigeration system in a third embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of the structural principle of a refrigeration system in a fourth embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of the structural principle of a refrigeration system of the fifth embodiment of the present invention.

[0027] Reference numerals:

[0028] Compressor 100; main air intake port 110; auxiliary air intake port 120; exhaust port 130;

[0029] Condenser 200;

[0030] The first branch 300; the first throttle 310; the first evaporator 320; the refrigeration evaporator 321;

[0031] The second branch 400; the second throttle 410; the second evaporator 420; the refrigeration evaporator 421;

[0032] Bypass branch 500; flow regulating member 510; stop valve 511; bypass capillary tube 512;

[0033] Control valve 600;

[0034] The third branch 700; the third throttle 710; the variable temperature evaporator 720;

[0035] Refrigeration system 1000. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", etc. 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 the present invention 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 cannot be understood as a limitation on the present invention.

[0039] In the description of the present invention, if there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features. Unless otherwise specified, "plurality" means two or more.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] Reference Figure 1As shown, the first branch 300 includes a first throttle 310 and a first evaporator 320, the first throttle 310 and the first evaporator 320 are connected in series, the inlet of the first throttle 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. Among them, the first evaporator 320 is a freezing evaporator 321, the inlet of the first throttle 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 the refrigerant passes through the condenser 200, a part of the refrigerant enters the first branch 300, first passes through the first throttle 310 for throttling, and then passes through the freezing evaporator 321 for evaporation after throttling, and finally flows into the main air intake port 110 for compression, so as to realize the refrigeration of the freezing evaporator 321.

[0045] Reference Figure 1 As shown, the second branch 400 includes a second throttling member 410 and a second evaporator 420, the second throttling member 410 and the second evaporator 420 are connected in series, the inlet of the second throttling 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, wherein the second evaporator 420 is a refrigerated evaporator 421, the inlet of the second throttling 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, the refrigerant is split after passing through the condenser 200, and the other part of the refrigerant enters the second branch 400, first passes through the second throttling member 410 for throttling, and then passes through the refrigerated evaporator 421 for evaporation, and finally flows into the compressor 100 from the auxiliary air intake port 120 for compression, thereby realizing the refrigeration of the refrigerated evaporator 421. Figure 1 The direction indicated by the arrow in the middle is the flow direction of the refrigerant in the refrigeration state.

[0046] It can be understood that the double suction compressor has the advantages of large cooling capacity and high refrigeration coefficient (COP, Coefficient Of Performance). Since the freezing evaporator 321 is connected to the main suction port 110, and the refrigeration evaporator 421 is connected to the auxiliary suction port 120, the freezing evaporator 321 and the refrigeration evaporator 421 can operate together, and can achieve high-efficiency refrigeration of double suction, 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.

[0047] Specifically, a refrigerator is used as an example for explanation. The refrigerator has a freezing compartment and a refrigerating compartment. The freezing evaporator 321 is arranged in the freezing compartment, and the refrigerating evaporator 421 is arranged in the refrigerating compartment. The freezing evaporator 321 and the refrigerating evaporator 421 can be direct cooling evaporators or air cooling evaporators. When refrigerating, the freezing evaporator 321 and the refrigerating evaporator 421 operate simultaneously, so that the freezing compartment and the refrigerating compartment can be refrigerated separately and quickly, meeting the freezing and refrigerating requirements of the refrigerator.

[0048] Considering that the freezing temperature of the refrigerator using a single-suction compressor in the related art is usually between -18°C and 24°C, it is only suitable for the preservation of ordinary food; however, with the improvement of living standards, users' storage needs for food and precious food are gradually increasing. For example, tuna can only be stored for 3 months at a temperature of -18°C and can be stored for 2 years at a temperature of -60°C; the refrigeration system 1000 of the above embodiment can be applied to a deep-freeze refrigerator (also called a deep-freeze refrigerator). By adopting a double-suction compressor, the refrigeration capacity can be effectively increased to meet the refrigeration capacity requirements of the deep-freeze refrigerator, so that the freezing temperature can reach -40°C, or even below -60°C, meeting the requirements of the deep-freeze temperature, and taking into account both the deep-freeze function and the low energy consumption performance.

[0049] 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 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. Taking a 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.

[0050] In addition, this is only an example, and the first evaporator 320 is not limited to being a freezing evaporator 321, and the second evaporator 420 is not limited to being a refrigerating evaporator 421. In some embodiments, the first evaporator 320 and the second evaporator 420 can be both freezing evaporators 321 or refrigerating evaporators 421, or the first evaporator 320 can be a refrigerating evaporator 421 and the second evaporator 420 can be a freezing evaporator 321. The specific selection is based on the actual application requirements.

[0051] Reference Figure 1As shown, 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 be used to control one of the first branch 300 and the second branch 400 to be turned on, and the first branch 300 and the second branch 400 can be controlled to be turned on at the same time, thereby realizing the switching of the freezing branch and the refrigeration branch.

[0052] 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 of the electric valve with the condenser 200, the first branch 300 and the second branch 400.

[0053] It is understandable that 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 321 and the refrigerating evaporator 421 can refrigerate at the same time. When the freezing compartment 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 321 stops running and the refrigerating evaporator 421 continues to run until the refrigerating compartment reaches the preset refrigerating temperature.

[0054] 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 321 and the refrigeration evaporator 421 respectively for evaporation.

[0055] 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.

[0056] 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. For example, the first throttling member 310 is a capillary tube and the second throttling member 410 is an expansion valve.

[0057] Reference Figure 1 As shown, the refrigeration system 1000 also includes a bypass branch 500, and the bypass branch 500 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.

[0058] Let's take a specific example to illustrate. Figure 1 The flow regulating member 510 of the illustrated embodiment is a stop valve 511. During refrigeration operation, the electric valve controls the first branch 300 and the second branch 400 to be connected at the same time, and the refrigeration evaporator 421 and the freezing evaporator 321 are refrigerated respectively, and the stop valve 511 is controlled to be closed. When the refrigeration compartment reaches the preset refrigeration temperature, that is, 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 connected, so that the freezing evaporator 321 continues to operate, and the stop valve 511 is kept in a closed state. For example, the preset refrigeration temperature is 4°C, and 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 does not reach the shutdown point, the refrigerant will continue to enter the compressor 100 through the main air intake port 110 to be compressed, and the main air intake port 110 can be kept running alone when the second branch 400 is closed.

[0059] Reference Figure 1 As shown, when the freezing evaporator 321 reaches the shutdown point, and the refrigerating evaporator 421 does not reach the shutdown point, the first branch 300 is controlled to be closed and the second branch 400 is kept open. Since there is a bypass branch 500 between the outlet of the refrigerating evaporator 421 and the main air inlet 110, the stop valve 511 is controlled to be opened at this time, so that a part of the refrigerant passing through the refrigerating evaporator 421 flows to the auxiliary air inlet 120, and the other part of the refrigerant flows to the main air inlet 110 through the bypass branch 500. The main air inlet 110 and the auxiliary air inlet 120 can work normally, so that the refrigerating evaporator 421 can continue 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 321 reaches the shutdown point, and the refrigerating evaporator 421 continues to keep refrigeration when it does not reach the shutdown point until the temperature of the refrigerating compartment reaches 4°C.

[0060] It should be noted that, considering that in the related art, when the compressor 100 has not reached the shutdown point and there is no bypass branch 500, closing the first branch 300 will cause the main air intake port 110 to be closed, affecting the operating stability of the compressor 100 and bringing disadvantages to the operating efficiency of the refrigeration system 1000, there is a problem that the main air intake port 110 cannot be closed alone, which will cause the freezing chamber to continue to be low temperature and cause liquid separation imbalance when the freezing evaporator 321 reaches the shutdown point and the refrigeration evaporator 421 does not reach the shutdown point. In other words, the first branch 300 cannot be closed alone when there is no bypass branch 500.

[0061] Based on this, the embodiment of the present invention can achieve, by adding a bypass branch 500 and cooperating with an electric valve, that 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 be kept in normal operation, effectively solving the problem that the main air intake port 110 in the double-suction compressor 100 cannot be closed alone.

[0062] Reference Figure 2 As shown, Figure 2 The flow regulating member 510 of the illustrated embodiment 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 and the main air intake port 110 through the bypass capillary tube 512. Compared with the bypass branch 500 using the stop valve 511, the bypass capillary tube 512 can keep the bypass branch 500 in a conductive state, so that during the operation of the refrigeration evaporator 421, 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 that of the bypass branch 500. Figure 1 In the embodiment shown, the bypass capillary 512 can reduce system cost and control difference, and the control cost is also low, which is more conducive to production application.

[0063] Of course, this is only an example, and the bypass capillary tube 512 is not limited to being connected between the outlet of the refrigeration evaporator 421 and the main air inlet 110, and the inlet of the bypass capillary tube 512 can also be connected between the electric valve and the second throttle 410, or between the second throttle 410 and the refrigeration evaporator 421. Figure 3As shown, 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, so that after the refrigeration evaporator 321 reaches the shutdown point, the electric valve controls the closing of the first branch 300, and 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 flow to the main air intake port 110 through the bypass capillary 512, 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 421 to continue to operate until it reaches the shutdown point.

[0064] 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 third throttling member 710 and a variable temperature 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 variable temperature evaporator 720, and the variable temperature evaporator 720 is connected to the main air intake port 110, that is, the third branch 700 is connected in parallel with the first branch 300.

[0065] 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, and 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 variable temperature evaporator 720 operate refrigeration at the same time to achieve efficient refrigeration; the freezing evaporator 321, the refrigeration evaporator 421 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.

[0066] 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.

[0067] 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 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-cooled evaporator.

[0068] Figure 4The flow regulating member 510 of the illustrated embodiment is a stop valve 511. During refrigeration operation, the electric valve controls the first branch 300, the second branch 400 and the third branch 700 to be connected simultaneously, and the refrigeration evaporator 421, the freezing evaporator 321 and the variable temperature evaporator 720 perform refrigeration respectively, while controlling the stop valve 511 to be closed.

[0069] Reference Figure 4 As shown, when the freezing evaporator 321 reaches the shutdown point, the electric valve can control the closure of the first branch 300 to keep the refrigerated evaporator 421 and the variable temperature evaporator 720 running; when the refrigerated evaporator 421 reaches the shutdown point, the electric valve can control the closure of the second branch 400 to keep the freezing evaporator 321 and the variable temperature evaporator 720 running.

[0070] Since a bypass branch 500 is provided between the outlet of the refrigerated evaporator 421 and the main air intake port 110, when the freezing evaporator 321 and the variable temperature evaporator 720 both reach the shutdown point, the first branch 300 and the third branch 700 can be controlled to be closed, and the stop valve 511 can be opened to divert the refrigerant to the main air intake port 110 through the bypass branch 500, so that the refrigerated evaporator 421 can continue to operate and the main air intake port 110 can be kept in normal operation, effectively solving the problem that the main air intake port 110 cannot be closed alone.

[0071] In some embodiments, the third throttling member 710 is a capillary tube, and the third throttling member 710 is used to reduce the evaporation temperature and evaporation pressure of the variable temperature evaporator 720. 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 710 is not limited to the capillary tube, and can also be an expansion valve or other throttling components.

[0072] Reference Figure 5 As shown, Figure 5 The flow regulating member 510 of the illustrated embodiment is a bypass capillary tube 512, and the bypass branch 500 connects the outlet of the refrigeration evaporator 421 with the main air intake port 110 through the bypass capillary tube 512. During the operation of the refrigeration evaporator 421, the bypass capillary tube 512 will maintain a certain flow of refrigerant flowing to the main air intake port 110. The bypass capillary tube 512 can reduce system costs and control differences, and the control cost is also low, which is more conducive to production applications.

[0073] Of course, this is only an example, and the inlet of the bypass capillary 512 is not limited to being connected to the outlet of the refrigeration evaporator 421, and can also be connected between the electric valve and the second throttle 410, or between the second throttle 410 and the refrigeration evaporator 421. For details, please refer to Figure 3 The connection structure of the embodiment shown.

[0074] It should be noted that Figure 2 , Figure 3 and Figure 5 In the illustrated embodiment, the length and inner diameter of the bypass capillary 512 of the bypass branch 500 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 421 on the second branch 400, ensuring that the refrigeration evaporator 421 can continue to operate 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.

[0075] It should be noted that in the embodiment of the present invention, the first throttling member 310, the second throttling member 410 and the third throttling member 710 are all capillary tubes, which can reduce the cost of the refrigeration system 1000, reduce control differences, and help improve operational stability.

[0076] 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 421 can provide refrigeration capacity for the refrigeration compartment of the refrigeration device, and the freezing evaporator 321 can provide refrigeration capacity for the freezing compartment of the refrigeration device.

[0077] The refrigeration system 1000 has the advantages of large cooling capacity and high COP due to the use of a double-suction compressor. The freezing evaporator 321 and the refrigeration evaporator 421 can operate together, and can achieve efficient refrigeration of double suction. The cooling capacity and energy efficiency are improved, and the cooling capacity requirements of deep freezing are met. The refrigeration system 1000 is particularly suitable for products such as deep freezing refrigerators, and is suitable for storing food and precious ingredients. By adding a bypass branch 500 between the second branch 400 and the main air intake port 110, the first branch 300 can be controlled to be closed through the control valve 600 when the freezing evaporator 321 reaches the shutdown point. The bypass branch 500 diverts the refrigerant on the second branch 400 to the main air intake port 110 through the flow regulating member 510, effectively solving the problem that the main air intake port 110 cannot be closed alone, and improving the operating efficiency of the refrigeration system 1000.

[0078] 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.

[0079] 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; 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; 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, characterized in that: 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, characterized in that: 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 claim 1, 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 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 claim 1, characterized in that: 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 claim 1, characterized in that: 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, characterized in that: 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, 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.

9. The refrigeration system according to claim 6, characterized in that: The first throttling member, the second throttling member and the third throttling member are all capillaries.

10. The refrigeration system according to claim 6, characterized in that: 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, characterized in that: Comprising a refrigeration system as claimed in any one of claims 1 to 10.

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