A refrigeration system

Abstract

The present invention provides a refrigeration system, which includes a compressor, a condenser, a medium-temperature evaporator, a low-temperature evaporator, a gas-liquid separator, a first throttling component, and a second throttling component. The outlet of the compressor is respectively connected to the condenser and the second throttling component; the first throttling component is arranged between the outlet of the condenser and the gas-liquid separator, and injects the medium-temperature refrigerant in the medium-temperature evaporator into the gas-liquid separator; the second throttling component is arranged between the compressor and the gas-liquid separator, and injects the low-temperature refrigerant in the low-temperature evaporator into the gas-liquid separator; the gas outlet of the gas-liquid separator is connected to the inlet of the compressor through a return air pipe, and the liquid outlet of the gas-liquid separator is respectively connected to the medium-temperature evaporator and the low-temperature evaporator; the first throttling component and the second throttling component include an ejector or an injector. The present invention is a multi-temperature zone refrigeration system with a vortex tube and an ejector, which can improve the system performance and meet the requirements of air conditioning, domestic hot water, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and more particularly to a multi-temperature zone refrigeration system. Background Art

[0002] With the progress of technology and the improvement of people's living standards, energy consumption is also increasing. Building energy consumption has become a major energy consumer, and the energy consumption of the heating, ventilation, and air conditioning industry accounts for a large part.

[0003] In a traditional vapor compression refrigeration system, an expansion valve is used for throttling and pressure reduction, resulting in mechanical energy loss after the high-pressure refrigerant is throttled, which affects the system performance; moreover, the traditional vapor compression refrigeration system cannot meet multiple temperature requirements simultaneously, resulting in single-temperature zone use only, with monotonous application scenarios and inability to meet multi-temperature zone use. Summary of the Invention

[0004] The purpose of the present invention is to provide a refrigeration system to solve the above-mentioned technical problems existing in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A refrigeration system provided by the present invention includes a compressor, a condenser, a medium-temperature evaporator, a low-temperature evaporator, a gas-liquid separator, a first throttling assembly, and a second throttling assembly, wherein:

[0007] The outlet of the compressor is respectively connected to the condenser and the second throttling assembly;

[0008] The first throttling assembly is arranged between the outlet of the condenser and the gas-liquid separator, and injects the medium-temperature refrigerant in the medium-temperature evaporator into the gas-liquid separator;

[0009] The second throttling assembly is arranged between the compressor and the gas-liquid separator, and injects the low-temperature refrigerant in the low-temperature evaporator into the gas-liquid separator;

[0010] The gas outlet of the gas-liquid separator is connected to the inlet of the compressor through a return pipe, and the liquid outlet of the gas-liquid separator is respectively connected to the medium-temperature evaporator and the low-temperature evaporator;

[0011] The first throttling assembly and the second throttling assembly include an ejector or a jet injector.

[0012] As a further improvement of the present invention, the refrigeration system further includes a vortex tube connected to the outlet of the compressor, the second throttling assembly is connected to the low-temperature outlet side of the vortex tube, and the condenser is connected to the high-temperature outlet side of the vortex tube.

[0013] As a further improvement of the present invention, an electronic expansion valve is further provided between the low-temperature evaporator and the gas-liquid separator.

[0014] As a further improvement of the present invention, the gas-liquid separator is a heat exchanger type separator, and further includes a heat exchange bypass for heat exchange with the gas-liquid separator.

[0015] As a further improvement of the present invention, a water pump and a surface cooler are provided on the heat exchange bypass.

[0016] As a further improvement of the present invention, the surface cooler is a fan air-cooled surface cooler.

[0017] As a further improvement of the present invention, the internal pipeline of the gas-liquid separator is a coil type layout structure.

[0018] As a further improvement of the present invention, the medium in the surface cooler is water or an ethylene glycol aqueous solution.

[0019] As a further improvement of the present invention, the condenser is a shell and tube heat exchanger or a double pipe heat exchanger.

[0020] The present invention has the following beneficial effects compared with the prior art:

[0021] The refrigeration system provided by the present invention, by designing a refrigeration system with an ejector or a jet, can replace the throttle valve to reduce the throttling loss, solve the throttling loss of the throttle valve in the traditional vapor compression refrigeration system, and can improve the system performance.

[0022] In a further embodiment of the present invention, by utilizing the vortex effect of the vortex tube, the system can make the condenser provide a higher heat exchange effect under a constant exhaust pressure, and can further increase the subcooling degree of the refrigerant entering the evaporator.

[0023] In the present invention, the gas-liquid separator adopts the form of a heat exchanger, which can realize the separation of gas and liquid and also realize the heat exchange between fluids. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 is the schematic diagram of the principle of the refrigeration system of the present invention;

[0026] Figure 2 is the schematic diagram of the interface structure of the ejector in the refrigeration system of the present invention.

[0027] In the figure, 1 is a compressor; 2 is a vortex tube; 3 is a condenser; 4 is a first ejector; 5 is a medium-temperature evaporator; 6 is a surface cooler; 7 is a water pump; 8 is a blower; 9 is a gas-liquid heat exchanger; 10 is an electronic expansion valve; 11 is a low-temperature evaporator; 12 is a second ejector. Specific Embodiment

[0028] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any creative work fall within the scope of protection of the present invention.

[0029] As Figure 1 shown, the present invention provides a refrigeration system, including a compressor 1, a condenser 3, a medium-temperature evaporator 5, a low-temperature evaporator 11, a gas-liquid separator, a first throttling assembly, and a second throttling assembly, wherein: the medium-temperature evaporator 5 and the low-temperature evaporator 11 are respectively applied to different cold-using demand scenarios.

[0030] The outlet of the compressor 1 is respectively connected to the condenser 3 and the second throttling assembly;

[0031] The first throttling assembly is arranged between the outlet of the condenser 3 and the gas-liquid separator, and injects the medium-temperature refrigerant in the medium-temperature evaporator 5 into the gas-liquid separator;

[0032] The second throttling assembly is arranged between the compressor 1 and the gas-liquid separator, and injects the low-temperature refrigerant in the low-temperature evaporator 11 into the gas-liquid separator;

[0033] The gas outlet of the gas-liquid separator is connected to the inlet of the compressor 1 through a return pipe, and the liquid outlet of the gas-liquid separator is respectively connected to the medium-temperature evaporator 5 and the low-temperature evaporator 11;

[0034] As Figure 2 shown, the first throttling assembly and the second throttling assembly include an ejector or a jet injector.

[0035] Specifically, the ejector includes three interfaces, namely a main ejector port a, an entrained port b, and an outlet c. The low-temperature refrigerant after heat exchange in the condenser 3 enters the main ejector port a of the first ejector, and then mixes with the refrigerant in the medium-temperature evaporator 5 to be entrained in the ejector and is discharged from the outlet c into the gas-liquid heat exchanger 9.

[0036] The refrigeration system provided by the present invention, by designing a refrigeration system with an ejector or a jet injector, can reduce the throttling loss instead of a throttle valve, solve the throttling loss of the throttle valve in the traditional vapor compression refrigeration system, and can improve the system performance.

[0037] In some embodiments, the refrigeration system further includes a vortex tube 2 connected to the outlet of the compressor 1. The second throttle assembly is connected to the low-temperature outlet side of the vortex tube 2, and the condenser 3 is connected to the high-temperature outlet side of the vortex tube 2. The vortex tube 2 has a simple structure, low cost, and no moving parts. It can divide a fluid with a constant pressure into two fluid streams, one cold and one hot. When applied in the refrigeration system, it can further increase the temperature of the refrigerant entering the condenser and further decrease the temperature of the refrigerant entering the evaporator. Since it can increase the subcooling degree of the refrigerant entering the evaporator, a set of units can meet the requirements of multi-temperature zone refrigeration, air conditioning, domestic hot water, etc. through different flow path distributions.

[0038] In a further embodiment of the present invention, by utilizing the vortex effect of the vortex tube 2, the system can provide a higher heat exchange effect in the condenser 3 under a constant exhaust pressure, and can further increase the subcooling degree of the refrigerant entering the evaporator.

[0039] In the present invention, the gas-liquid separator adopts the form of a heat exchanger, which can realize gas-liquid separation and fluid heat exchange at the same time.

[0040] Furthermore, an electronic expansion valve 10 is also provided between the low-temperature evaporator 11 and the gas-liquid separator.

[0041] In this embodiment, the gas-liquid separator is a heat exchanger type separator, that is, the gas-liquid separation heat exchanger 9. Hereinafter, the gas-liquid separator will be collectively referred to as the gas-liquid separation heat exchanger 9. It also includes a heat exchange bypass for exchanging heat with the gas-liquid separation heat exchanger 9 to reduce the temperature of the refrigerant. Designing the gas-liquid separator into the form of a heat exchanger can realize gas-liquid separation and fluid heat exchange at the same time.

[0042] Specifically, a water pump 7 and a surface cooler 6 are provided on the heat exchange bypass.

[0043] Specifically, the surface cooler 6 is a fan air-cooled surface cooler 6.

[0044] In this embodiment, the internal pipeline of the gas-liquid separation heat exchanger 9 is a coil-type layout structure.

[0045] In some embodiments, the medium in the surface cooler 6 is water or an ethylene glycol aqueous solution.

[0046] Furthermore, the condenser 3 is a shell-and-tube heat exchanger or a double-pipe heat exchanger.

[0047] Usage method: When the refrigeration system is operating, the high-temperature and high-pressure gaseous refrigerant is compressed by the compressor 1 and then enters the vortex tube 2. The vortex tube 2 divides it into two parts. One part of the refrigerant enters the condenser 3 for condensation and heat release. The condensed refrigerant enters the main injection port of the first injector 4 as the main injection flow, and injects the gaseous refrigerant in the medium-temperature evaporator 5. The two parts of the refrigerant are mixed and then enter the gas-liquid heat exchanger 9 through the outlet of the first injector 4. The other part of the refrigerant enters the main injection port of the second injector 12 as the main injection flow, and injects the gaseous refrigerant in the low-temperature evaporator 11. The two parts of the refrigerant are mixed and then enter the gas-liquid heat exchanger 9 through the outlet of the second injector 12. The low-temperature and low-pressure gaseous refrigerant in the gas-liquid heat exchanger 9 enters the compressor 1 through the gas outlet of the gas-liquid heat exchanger 9 to complete compression. The low-temperature liquid refrigerant in the gas-liquid heat exchanger 9 is divided into two paths. One path passes through the electronic expansion valve 10 through the liquid outlet of the gas-liquid heat exchanger 9 and enters the low-temperature evaporator 11 for evaporation and heat absorption. The low-temperature gaseous refrigerant coming out of the low-temperature evaporator 11 enters the secondary injection port of the second injector 12 as the secondary injection flow. The other path enters the medium-temperature evaporator 5 through the liquid outlet of the gas-liquid heat exchanger 9 for evaporation and heat absorption. The low-temperature gaseous refrigerant coming out of the medium-temperature evaporator 5 enters the secondary injection port of the first injector 4 as the secondary injection flow and is sent into the gas-liquid heat exchanger 9.

[0048] In this embodiment, the gas-liquid heat exchanger 9 can realize gas-liquid separation and fluid-to-fluid heat exchange at the same time. Specifically, the internal pipeline of the gas-liquid heat exchanger 9 can be designed in a coil type. The medium in the surface cooler 6 can be water, ethylene glycol aqueous solution or other media, and the medium in the flow path circulates under the drive of the water pump 7. The high-temperature water is driven by the water pump 7 and enters the internal coil of the low-temperature gas-liquid heat exchanger 9 for heat exchange and then becomes low-temperature water. The low-temperature water completes heat exchange with the air sent by the air blower 8 in the surface cooler 6.

[0049] Among them, the condenser 3 can be designed as a shell-and-tube heat exchanger (or a double-pipe heat exchanger or other types). Utilizing the vortex effect of the vortex tube 2, the system can provide a higher heat exchange effect in the condenser 3 under a constant exhaust pressure, produce hot water at a higher temperature, and can be used for domestic hot water. Similarly, utilizing the vortex effect of the vortex tube 2 can further increase the subcooling degree of the refrigerant entering the evaporator, improve the system performance, and be applied to the refrigeration needs of different occasions. For example, the medium-temperature evaporator 5 can realize the refrigeration function of food. The low-temperature evaporator 11 can realize the freezing function of food.

[0050] Here, it should be noted first that "inward" is the direction towards the center of the accommodating space, and "outward" is the direction away from the center of the accommodating space.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the Figure 1 orientation or positional relationship shown, and is 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 should not be construed as a limitation on the present invention.

[0052] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0053] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0055] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0056] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A refrigeration system, characterized in that, It includes a compressor, a condenser, a medium-temperature evaporator, a low-temperature evaporator, a gas-liquid separator, a first throttling component, and a second throttling component, where: The outlet of the compressor is respectively connected to the condenser and the second throttling component; The first throttling component is arranged between the outlet of the condenser and the gas-liquid separator, and injects the medium-temperature refrigerant in the medium-temperature evaporator into the gas-liquid separator; The second throttling component is arranged between the compressor and the gas-liquid separator, and injects the low-temperature refrigerant in the low-temperature evaporator into the gas-liquid separator; The gas outlet of the gas-liquid separator is connected to the inlet of the compressor through a return pipe, and the liquid outlet of the gas-liquid separator is respectively connected to the medium-temperature evaporator and the low-temperature evaporator; The first throttling component and the second throttling component include an ejector or an injector; The gas-liquid separator is a heat exchanger type separator, and also includes a heat exchange bypass for heat exchange with the gas-liquid separator; the internal pipeline of the gas-liquid separator is a coil type layout structure.

2. The refrigeration system according to claim 1, wherein, The refrigeration system also includes a vortex tube connected to the outlet of the compressor, the second throttling component is connected to the low-temperature outlet side of the vortex tube, and the condenser is connected to the high-temperature outlet side of the vortex tube.

3. The refrigeration system according to claim 2, characterized in that, An electronic expansion valve is also arranged between the low-temperature evaporator and the gas-liquid separator.

4. The refrigeration system according to claim 3, characterized in that, A water pump and a surface cooler are arranged on the heat exchange bypass.

5. The refrigeration system according to claim 4, wherein, The surface cooler is a fan air-cooled surface cooler.

6. The refrigeration system according to claim 3, characterized in that, The internal pipeline of the gas-liquid separator is a coil type layout structure.

7. The refrigeration system according to claim 4, wherein The medium in the surface cooler is water or an ethylene glycol aqueous solution.

8. The refrigeration system according to claim 1, characterized in that, The condenser is a shell-and-tube heat exchanger or a double-pipe heat exchanger.

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