Reheating device, refrigeration system and refrigeration equipment

Abstract

The application discloses a heat recovery device, a refrigeration system and a refrigeration equipment, and belongs to the refrigeration technical field. The heat recovery device comprises a supercooling flow path and a plurality of superheating flow paths. The supercooling flow path is used for flowing a first fluid. The plurality of superheating flow paths comprise a first flow path, a second flow path and a third flow path. The first flow path and the third flow path are in communication and form a heat exchange unit. The heat exchange unit is used for flowing a second fluid. The second flow path is arranged between the first flow path and the third flow path and is used for flowing a third fluid. The temperature of the third fluid flowing into the second flow path is higher than the temperature of the second fluid flowing into the heat exchange unit. The application realizes step-by-step recovery of the heat carried by the first fluid, reduces the heat loss caused by the large temperature difference between the cold fluid and the hot fluid, and further improves the overall heat recovery rate of the heat recovery device.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to a regenerative device, a refrigeration system, and refrigeration equipment. Background Technology

[0002] To improve the refrigeration efficiency of refrigeration systems, related technologies commonly incorporate regenerators, enabling heat exchange between the high-temperature refrigerant at the condenser outlet and the low-temperature refrigerant at the evaporator outlet. This achieves subcooling of the high-temperature refrigerant and superheating of the low-temperature refrigerant. However, when exchanging heat between a single high-temperature refrigerant and multiple low-temperature refrigerants at different temperatures, existing regenerators often directly exchange heat between each low-temperature refrigerant and the high-temperature refrigerant separately. This results in the heat carried by the high-temperature refrigerant not being fully recovered and utilized, leading to low regeneration efficiency. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a heat recovery device that can realize the step-by-step recovery of heat carried by the first fluid, thereby improving the overall heat recovery rate of the heat recovery device.

[0004] The present invention also proposes a refrigeration system and refrigeration equipment including the above-mentioned heat recovery device.

[0005] According to a first aspect of the present invention, a regenerative device is applied to a refrigeration system, characterized in that the refrigeration system includes a condenser, a first evaporator, and a second evaporator, and the regenerative device includes: A subcooling flow path is provided for the first fluid flow from the outlet of the condenser; Multiple superheated flow paths are arranged sequentially along the flow direction of the first fluid in the supercooled flow path, and are capable of exchanging heat with the supercooled flow path respectively. The multiple superheated flow paths include a first flow path, a second flow path, and a third flow path. The first flow path and the third flow path are connected to form a heat exchange unit. The heat exchange unit is used to supply a second fluid from the outlet of the first evaporator. The second flow path is located between the first flow path and the third flow path and is used to supply a third fluid from the outlet of the second evaporator. The temperature of the third fluid flowing into the second flow path is higher than the temperature of the second fluid flowing into the heat exchange unit.

[0006] The regenerative apparatus according to embodiments of the present invention has at least the following beneficial effects: The regenerative device of this invention arranges multiple superheated flow paths sequentially along the first fluid flow direction of the subcooled flow path, and configures a second flow path between the first and third flow paths. Simultaneously, a third fluid with a relatively high initial temperature is introduced into the second flow path, and a second fluid with a relatively low initial temperature is introduced into a heat exchange unit formed by connecting the first and third flow paths. Based on this, the first fluid first exchanges heat with the second fluid in the heat exchange unit, completing primary cooling. Subsequently, it flows through the second flow path and is further cooled by the third fluid therein, causing the temperature of the first fluid to drop again. After two cooling cycles, the first fluid exchanges heat with the second fluid in the heat exchange unit again. This not only achieves the step-by-step recovery of the heat carried by the first fluid but also reduces heat loss caused by the large temperature difference between the hot and cold fluids, thereby improving the overall heat recovery rate of the regenerative device.

[0007] According to some embodiments of the present invention, in the flow direction of the first fluid, the inlet end of the heat exchange unit is closer to the outlet end of the subcooled flow path than the outlet end of the heat exchange unit.

[0008] According to some embodiments of the present invention, the regenerative device includes a subcooled pipe, a first superheated pipe, a second superheated pipe, and a third superheated pipe, wherein the subcooled pipe defines the subcooled flow path, and the subcooled pipe includes a first pipe section, a second pipe section, and a third pipe section disposed along the flow direction of the first fluid; The first superheated pipe defines the first flow path; the second superheated pipe defines the second flow path and is connected to the outlet of the second evaporator; the third superheated pipe defines the third flow path and is connected at one end to the outlet of the first evaporator and at the other end to the first superheated pipe. The first pipe segment is configured to exchange heat with the first superheated pipe, the second pipe segment is configured to exchange heat with the second superheated pipe, and the third pipe segment is configured to exchange heat with the third superheated pipe. According to some embodiments of the present invention, the first superheated pipe extends axially along the first pipe segment and passes through the first pipe segment, and a first channel is defined between the inner wall of the first pipe segment and the outer wall of the first superheated pipe. The second superheated pipe extends axially along the second pipe section and passes through the second pipe section, and a second channel is defined between the inner wall of the second pipe section and the outer wall of the second superheated pipe. The third superheated pipe extends axially along the third pipe section and passes through the third pipe section, and a third channel is defined between the inner wall of the third pipe section and the outer wall of the third superheated pipe. The first channel, the second channel, and the third channel are sequentially connected to form the subcooling flow path.

[0009] According to some embodiments of the present invention, at least a portion of the first pipe segment extends spirally to form a first annular structure; at least a portion of the second pipe segment extends spirally to form a second annular structure; and at least a portion of the third pipe segment extends spirally to form a third annular structure. According to some embodiments of the present invention, the third annular structure, the second annular structure, and the first annular structure are arranged sequentially from the inside to the outside along the radial direction of the first annular structure.

[0010] According to some embodiments of the present invention, the inlet and outlet ends of the first annular structure, the inlet and outlet ends of the second annular structure, and the inlet and outlet ends of the third annular structure are respectively arranged in the same direction. A refrigeration system according to a second aspect of the present invention includes: a compressor, a condenser, a throttling assembly, a first evaporator, a second evaporator, and a regenerative device as described in the first aspect embodiment; the throttling assembly includes a first throttling element and a second throttling element; wherein the inlet end of the subcooling flow path is connected to the outlet end of the condenser, the outlet end of the subcooling flow path is connected to both the first throttling element and the second throttling element, the inlet end of the first flow path is connected to the outlet end of the third flow path, the outlet end of the first flow path is connected to the compressor, the inlet end of the third flow path is connected to the outlet end of the first evaporator, the inlet end of the second flow path is connected to the outlet end of the second evaporator, and the outlet end of the second flow path is connected to the compressor. The refrigeration system according to embodiments of the present invention has at least the following beneficial effects: The refrigeration system of this invention adopts the regenerative device of the first aspect embodiment. By optimizing the structural design of the regenerative device, the overall heat recovery efficiency of the regenerative device is improved. This not only increases the subcooling of the high-temperature refrigerant before it enters the throttling component, thereby reducing the generation of flash gas, but also increases the superheat of the low-temperature refrigerant entering the compressor return port, thereby reducing the risk of liquid slugging in the compressor and improving the overall energy efficiency and operational reliability of the refrigeration system.

[0011] A refrigeration device according to a third aspect of the present invention includes the refrigeration system described in the second aspect embodiment.

[0012] The refrigeration device according to embodiments of the present invention has at least the following beneficial effects: The refrigeration equipment of this invention adopts the refrigeration system of the second aspect embodiment. By optimizing the refrigeration system, the heat recovery efficiency inside the refrigeration system is improved, thereby reducing the overall energy consumption of the refrigeration equipment during long-term operation, improving the refrigeration effect and operational stability of the refrigeration equipment, and reducing the failure rate of the refrigeration equipment.

[0013] According to some embodiments of the present invention, the refrigeration equipment includes an inner liner and a chassis, and an insulation layer is provided between the inner liner and the chassis; Wherein, the heat recovery device is located on the side of the insulation layer near the inner liner; and / or, A vacuum insulation plate is provided between the heat recovery device and the insulation layer.

[0014] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of a refrigeration system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the heat exchange process of a regenerating device according to an embodiment of the present invention; Figure 3 This is a top view schematic diagram of a regenerator according to an embodiment of the present invention; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 This is an exploded schematic diagram of a regenerator device according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a regenerator according to an embodiment of the present invention; Figure 7 This is an exploded schematic diagram of a refrigeration device according to an embodiment of the present invention.

[0016] Icon labels: Compressor 1000; Condenser 2000; Regenerator 3000; First throttling element 4000; Second throttling element 5000; First evaporator 6000; Second evaporator 7000; Inner liner 8000; Outer shell 9000; Enclosure 9100; Chassis 9200; Subcooling flow path 100; Superheated flow path 200; First flow path 210; Second flow path 220; Third flow path 230; Heat exchange unit 240; Subcooled pipe 300; First pipe section 310; First channel 311; First spiral section 312; First annular structure 313; First inlet section 314; First outlet section 315; Second pipe section 320; Second channel 321; Second spiral section 322; Second annular structure 323; Second inlet section 324; Second outlet section 325; Third pipe section 330; Third channel 331; Third spiral section 332; Third annular structure 333; Third inlet section 334; Third outlet section 335; First adapter 340; Second adapter 350; Third adapter 360; Fourth adapter 370; Fifth adapter 380; Sixth adapter 390; First superheated pipe 400; Second superheated pipe 500; Third superheated pipe 600; First connecting tube 700; Second connecting tube 800; Third connecting tube 900. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0019] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0020] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0021] In a refrigeration system, the regenerator's function is to subcool the high-temperature refrigerant flowing out of the condenser outlet and superheat the low-temperature refrigerant flowing out of the evaporator outlet. Increasing the subcooling of the high-temperature refrigerant increases the cooling capacity and reduces the generation of flash gas, thereby improving the energy efficiency of the refrigeration system. Increasing the superheat of the low-temperature refrigerant ensures that the refrigerant entering the compressor is completely vaporized, reducing the risk of compressor damage due to liquid slugging.

[0022] However, in scenarios involving heat exchange between a single high-temperature refrigerant and multiple low-temperature refrigerants at different temperatures, existing technologies typically employ either converging the multiple low-temperature refrigerants before heat exchange or directly exchanging heat between each low-temperature refrigerant and the high-temperature refrigerant. In the former case, when low-temperature fluids at different temperatures are mixed, the temperature of the relatively lower-temperature fluid passively rises, resulting in the loss of its cooling capacity. In the latter case, due to the temperature difference between the high-temperature refrigerant and the low-temperature refrigerants at different temperatures, the heat carried by the high-temperature refrigerant cannot be efficiently and progressively transferred to the individual low-temperature refrigerants. This not only limits further improvement in the subcooling of the high-temperature refrigerant but also reduces the heat recovery rate of the regenerator.

[0023] To address the aforementioned problems, some embodiments of the present invention propose a heat recovery device 3000, applied to a refrigeration system having a condenser 2000, a first evaporator 6000, and a second evaporator 7000. This device can reduce heat loss caused by large temperature differences between the hot and cold fluids, thereby improving the overall heat recovery rate of the heat recovery device 3000. See details below. Figures 1 to 7 The regenerator 3000 is described below.

[0024] For ease of description, the following description will use the application of the regenerative device 3000 in a refrigeration system as an example. (Refer to...) Figure 1 As shown, in this embodiment of the invention, the refrigeration system includes: a compressor 1000, a condenser 2000, a throttling component, a first evaporator 6000, a second evaporator 7000, and a regeneration device 3000. The inlet of the condenser 2000 is connected to the outlet of the compressor 1000 to condense the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 1000 into a medium-temperature, high-pressure liquid refrigerant, which is the first fluid. In this embodiment, the regeneration device 3000 includes a subcooling flow path 100 for supplying the first fluid.

[0025] Continue to refer to Figure 1As shown in this embodiment of the invention, the regeneration device 3000 further includes a plurality of superheated flow paths 200, which are channels for the cryogenic refrigerant to flow in the regeneration device 3000 and exchange heat with the subcooled flow path 100. The plurality of superheated flow paths 200 are arranged sequentially along the flow direction of the first fluid in the subcooled flow path 100, and each superheated flow path 200 corresponds to a heat exchange section on the subcooled flow path 100. Based on this, the cryogenic fluid in each superheated flow path 200 can exchange heat with the first fluid in the subcooled flow path 100 respectively.

[0026] It should be noted that the number of superheated flow paths 200 can be set according to the number of cryogenic fluids in the refrigeration system that need to exchange heat with the first fluid. For example, when there are two cryogenic fluids with different temperatures in the refrigeration system, the number of superheated flow paths 200 should be at least three; when there are three or more cryogenic fluids with different temperatures in the refrigeration system, the number of superheated flow paths 200 can be increased accordingly, for example, four or more superheated flow paths 200 can be set. This embodiment does not limit this.

[0027] Combination Figure 2 It can be understood that the multiple superheated flow paths 200 include a first flow path 210, a second flow path 220, and a third flow path 230, which are arranged along the flow direction of the first fluid, so as to... Figure 2 Taking the left-right direction as an example, the first fluid flows from left to right in the subcooled flow path 100. Based on this, the first flow path 210, the second flow path 220, and the third flow path 230 are arranged sequentially from left to right. After entering from the left inlet end of the subcooled flow path 100, the first fluid first flows through the heat exchange section corresponding to the first flow path 210 and undergoes the first heat exchange with the second fluid in the first flow path 210. Subsequently, the first fluid flows to the right through the heat exchange section corresponding to the second flow path 220 and undergoes the second heat exchange with the third fluid in the second flow path 220. Finally, the first fluid continues to flow to the right through the heat exchange section corresponding to the third flow path 230 and undergoes the third heat exchange with the second fluid in the third flow path 230, and then flows out from the right outlet end of the subcooled flow path 100.

[0028] It should be noted that the arrangement of the first flow path 210, the second flow path 220, and the third flow path 230 on the subcooled flow path 100 is not limited to a continuous, adjacent arrangement. Additional superheated flow paths 200 can be arranged between them according to actual heat exchange requirements. For example, one or more additional superheated flow paths 200 can be provided between the first flow path 210 and the second flow path 220. These additional superheated flow paths 200 can be connected in series with the second flow path 220 to supply the flow of a third fluid, or they can supply the flow of low-temperature fluid from the outlet of other evaporators or economizers in the refrigeration system. Similarly, an additional superheated flow path 200 can also be provided between the second flow path 220 and the third flow path 230.

[0029] Reference Figure 2 As shown, in this embodiment of the invention, the first flow path 210 and the third flow path 230 are connected to form a heat exchange unit 240. The heat exchange unit 240 is used to supply the flow of a second fluid from the outlet of the first evaporator 6000. In the flow direction of the first fluid, the inlet end of the heat exchange unit 240 is closer to the outlet end of the subcooling flow path 100 than the outlet end of the heat exchange unit 240. In other words, the inlet end of the heat exchange unit 240 is close to the outlet end of the subcooling flow path 100, and the outlet end of the heat exchange unit 240 is close to the inlet end of the subcooling flow path 100. Therefore, the flow direction of the second fluid is opposite to that of the first fluid, and based on this, the heat exchange efficiency between the first fluid and the second fluid can be improved.

[0030] Continue to refer to Figure 2 As shown, in this embodiment of the invention, the second flow path 220 is disposed between the first flow path 210 and the third flow path 230, and is used to supply the flow of the third fluid from the outlet of the second evaporator 7000, wherein the temperature of the third fluid flowing into the second flow path 220 is higher than the temperature of the second fluid flowing into the heat exchange unit 240. (Refer to...) Figure 1 As shown, in this embodiment of the invention, the throttling assembly includes a first throttling element 4000 and a second throttling element 5000. Based on this, the first fluid discharged from the subcooled flow path 100 is divided into two branches. One branch flows through the first throttling element 4000 for throttling and pressure reduction before entering the first evaporator 6000, where it is converted into a second fluid through endothermic evaporation. The other branch flows through the second throttling element 5000 for throttling and pressure reduction before entering the second evaporator 7000, where it is converted into a third fluid through endothermic evaporation. In this embodiment, the evaporation temperature of the first evaporator 6000 is lower than the evaporation temperature of the second evaporator 7000; therefore, the temperature of the second fluid flowing out of the outlet of the first evaporator 6000 is lower than the temperature of the third fluid flowing out of the outlet of the second evaporator 7000.

[0031] For ease of description, the following content will be in the format of Figure 2Taking the left-right direction as an example, the second fluid enters the third flow path 230 from the right end of the heat exchange unit 240. At this time, the temperature of the second fluid is at its lowest point. The first fluid, which it exchanges heat with, has already undergone two heat exchanges in the upstream first flow path 210 and second flow path 220, and its temperature has already decreased. Therefore, the temperature difference between the first fluid and the second fluid in the third flow path 230 is small. After absorbing heat from the first fluid in the third flow path 230, the temperature of the second fluid rises, and it then flows into the first flow path 210. At this time, the temperature of the second fluid has risen, while the first fluid, which it exchanges heat with, has just entered the subcooling flow path 100 from the condenser 2000 outlet, and its temperature is at its highest point. The temperature difference between the two is also within a small range. It can be understood that the second fluid exchanges heat with the first fluid twice in the heat exchange unit 240, so that the second fluid, which is relatively colder than the third fluid, can be fully heated, and the temperature difference during each heat exchange is small, thereby reducing heat loss during the heat exchange process.

[0032] Continue to refer to Figure 2 As shown, after the first fluid completes its first heat exchange with the second fluid in the first flow path 210, its temperature decreases. It then flows into the second flow path 220, where it is further cooled by the third fluid, causing its temperature to drop again before entering the third flow path 230. This cooling by the third fluid lowers the temperature of the first fluid as it enters the third flow path 230, reducing the temperature difference between the first fluid and the second fluid at its lowest temperature in the third flow path 230, thereby minimizing heat loss during the heat exchange process.

[0033] Understandably, from the perspective of the first fluid, it undergoes three heat exchanges sequentially in the subcooled flow path 100: first, it is cooled by a slightly lower temperature second fluid in the first flow path 210; then, it is cooled by a slightly lower temperature third fluid in the second flow path 220; and finally, it is cooled by the lowest temperature second fluid in the third flow path 230. The temperature of the heat exchange object of the first fluid decreases step by step, achieving the gradual recovery of heat carried by the first fluid and improving the heat recovery rate. Specifically, the temperatures of the slightly lower temperature, slightly lower temperature, and lowest temperature decrease sequentially. The slightly lower temperature second fluid and the lowest temperature second fluid are the same fluid, but the former is in a relatively higher temperature state due to heat absorption.

[0034] From the perspective of the second fluid, the second fluid's heat absorption is increased by passing through the third flow path 230 and the first flow path 210 twice, which further increases its superheat, thereby reducing the risk of refrigerant returning to the compressor 1000 and thus reducing the risk of the compressor 1000 being damaged by liquid slugging, and improving the durability and reliability of the compressor 1000.

[0035] The regenerative device 3000 of this invention arranges multiple superheated flow paths 200 sequentially along the first fluid flow direction of the subcooled flow path 100, and configures a second flow path 220 between the first flow path 210 and the third flow path 230. Simultaneously, a third fluid with a relatively high initial temperature is introduced into the second flow path 220, and a second fluid with a relatively low initial temperature is introduced into the third flow path 230. The second fluid then flows from the third flow path 230 to the first flow path 210. Based on this, the first fluid first exchanges heat with the second fluid that has completed preliminary heat absorption in the first flow path 210, completing the primary cooling. Subsequently, it flows through the second flow path 220 and is further cooled by the third fluid therein, causing the temperature of the first fluid to drop again.

[0036] Obviously, after two cooling cycles, the temperature difference between the first fluid and the second fluid in the third flow path 230, which is at its lowest temperature, is reduced. This allows the first fluid to always match the heat exchange object with a small temperature difference as its temperature gradually decreases. This not only achieves the step-by-step recovery of the heat carried by the first fluid, but also reduces the heat loss caused by the large temperature difference between the hot and cold fluids, thereby improving the overall heat recovery rate of the heat recovery device 3000.

[0037] Reference Figure 2 As shown, in this embodiment of the invention, the regenerator 3000 includes a subcooling pipe 300, a first superheating pipe 400, a second superheating pipe 500, and a third superheating pipe 600. The subcooling pipe 300 serves as a channel for the flow of the first fluid within the regenerator 3000. Accordingly, a subcooling flow path 100 is disposed within the subcooling pipe 300. (Refer to...) Figure 3 As shown, the subcooling pipe 300 includes a first pipe section 310, a second pipe section 320, and a third pipe section 330 arranged along the flow direction of the first fluid. In this embodiment, the first pipe section 310, the second pipe section 320, and the third pipe section 330 are connected in series. After the first fluid flows out from the outlet of the condenser 2000, it flows through the first pipe section 310, the second pipe section 320, and the third pipe section 330 in sequence.

[0038] Continue to refer to Figure 2 As shown, in this embodiment of the invention, the first flow path 210 is disposed within the first superheated pipe 400, the second flow path 220 is disposed within the second superheated pipe 500, and the third flow path 230 is disposed within the third superheated pipe 600. The second superheated pipe 500 is connected to the outlet of the second evaporator 7000, and one end of the third superheated pipe 600 is connected to the outlet of the first evaporator 6000, while the other end is connected to the first superheated pipe 400. (Combined with...) Figure 2 It is understood that, in this embodiment of the invention, the first pipe section 310 is configured to exchange heat with the first superheated pipe 400, the second pipe section 320 is configured to exchange heat with the second superheated pipe 500, and the third pipe section 330 is configured to exchange heat with the third superheated pipe 600.

[0039] In other words, the second fluid flows out from the outlet of the first evaporator 6000 and then flows into the inlet of the third superheated pipe 600. After absorbing heat and heating up in the third superheated pipe 600, the second fluid flows into the first superheated pipe 400 and undergoes a second heat exchange with the first fluid at the first pipe section 310. In this embodiment, the second fluid can exchange heat with the first fluid located in two non-adjacent pipe sections, thereby achieving two-stage heat recovery of the first fluid.

[0040] It should be noted that heat exchange between the first pipe section 310 and the first superheated pipe 400, between the second pipe section 320 and the second superheated pipe 500, and between the third pipe section 330 and the third superheated pipe 600 can be achieved in various ways. Taking the first pipe section 310 and the first superheated pipe 400 as an example, in one example, the outer wall of the first pipe section 310 is in contact with the outer wall of the first superheated pipe 400, and the two pipes are arranged in parallel side by side. The first fluid and the second fluid exchange heat through the contacting pipe walls.

[0041] In another example, the first pipe section 310 and the first superheated pipe 400 exchange heat through shared fins. That is, heat-conducting fins are provided between the first pipe section 310 and the first superheated pipe 400. One end of the fin is connected to the outer wall of the first pipe section 310, and the other end is connected to the outer wall of the first superheated pipe 400. The heat between the first fluid and the second fluid is conducted through the fins.

[0042] Reference Figure 4 As shown, in this embodiment of the invention, each superheated pipe is respectively installed inside the corresponding subcooled pipe 300 segment, thereby forming a pipe-in-pipe sleeve structure. Specifically, the first superheated pipe 400 extends axially along the first pipe segment 310 and is installed inside the first pipe segment 310, with a first channel 311 defined between the inner wall of the first pipe segment 310 and the outer wall of the first superheated pipe 400; the second superheated pipe 500 extends axially along the second pipe segment 320 and is installed inside the second pipe segment 320, with a second channel 321 defined between the inner wall of the second pipe segment 320 and the outer wall of the second superheated pipe 500; the third superheated pipe 600 extends axially along the third pipe segment 330 and is installed inside the third pipe segment 330, with a third channel 331 defined between the inner wall of the third pipe segment 330 and the outer wall of the third superheated pipe 600.

[0043] Among them, continue to refer to Figure 4As shown, in this embodiment of the invention, the first channel 311 has an annular cross-section. A first fluid flows within the first channel 311, and a second fluid flows within the first superheated pipe 400. The first fluid and the slightly colder second fluid exchange heat through the wall of the first superheated pipe 400. Similarly, the first fluid and the third fluid exchange heat through the wall of the second superheated pipe 500, and the first fluid and the lowest-temperature second fluid exchange heat through the wall of the third superheated pipe 600.

[0044] In this embodiment of the invention, the first channel 311, the second channel 321, and the third channel 331 are sequentially connected to form a subcooled flow path 100. The first fluid flows out of the condenser 2000 outlet and into the first channel 311, flowing along the space between the first pipe section 310 and the first superheated pipe 400, thereby exchanging heat with the second fluid within the first superheated pipe 400. Subsequently, the first fluid flows from the first channel 311 into the second channel 321 and exchanges heat with the third fluid within the second superheated pipe 500. Finally, the first fluid flows from the second channel 321 into the third channel 331, thereby exchanging heat with the second fluid within the third superheated pipe 600.

[0045] Understandably, the sleeve structure allows the outer wall of the superheated pipe to directly face the inner wall of the subcooled pipe 300 segment, with only one pipe wall separating the two fluids, thereby improving heat exchange efficiency. It should be noted that the inner diameter and length of each segment of the subcooled pipe 300, and the outer diameter and length of the first superheated pipe 400, the second superheated pipe 500, and the third superheated pipe 600 can all be set according to heat exchange requirements. For example, if the temperature difference between the first and second fluids is small at the third pipe segment 330, the length of the third pipe segment 330 can be increased or the cross-sectional area of ​​the third channel 331 can be decreased.

[0046] Reference Figure 5 As shown, in this embodiment of the invention, the first pipe segment 310 includes a first helical segment 312, which extends helically to form a first annular structure 313. Specifically, the first helical segment 312 extends helically multiple times, thereby forming the first annular structure 313. Similarly, the second pipe segment 320 includes a second helical segment 322, which extends helically and forms a second annular structure 323 after multiple turns; the third pipe segment 330 includes a third helical segment 332, which extends helically and forms a third annular structure 333 after multiple turns. It should be noted that since each superheated pipe is installed inside its corresponding pipe section, when the subcooled pipe 300 extends spirally, the superheated pipes installed inside it also extend spirally. In other words, the entire casing structure forms a spiral coil structure, which allows for longer pipe lengths to be accommodated within the same space, improving the overall compactness of the regenerator 3000 and increasing the heat exchange area between fluids, thereby improving the heat recovery rate.

[0047] In one example, the first annular structure 313, the second annular structure 323, and the third annular structure 333 are stacked along their own axial direction. Taking the installation in the vertical direction as an example, the first annular structure 313 is located on the top layer, the second annular structure 323 is located in the middle layer, and the third annular structure 333 is located on the bottom layer, so that the heat recovery device 3000 is columnar in shape, which is suitable for placement in a space with limited horizontal space but sufficient vertical space.

[0048] Reference Figure 3 As shown, in another example, along the radial direction of the first annular structure 313, the third annular structure 333, the second annular structure 323, and the first annular structure 313 are arranged sequentially from the inside out. Specifically, the third annular structure 333 is located on the innermost side, the second annular structure 323 is located in the middle, and the first annular structure 313 is located on the outermost side. The three annular structures form a flat, multi-layered spiral coil structure, which is suitable for arrangement in spaces with limited vertical space but relatively sufficient horizontal space.

[0049] Furthermore, the heat exchange temperature is lowest in the innermost third annular structure 333, which is surrounded by the second annular structure 323 and the first annular structure 313 in sequence. The fluid temperature flowing in the second annular structure 323 and the first annular structure 313 is higher than that in the inner layer, so that the overall temperature distribution of the regenerator 3000 is gradually decreasing from the outside to the inside in the radial direction. This reduces the amount of cold energy transferred from the innermost low-temperature region to the external environment, and further improves the utilization rate of the cold energy of the low-temperature refrigerant and the heat energy of the high-temperature refrigerant.

[0050] Reference Figure 5As shown, in this embodiment of the invention, the first pipe section 310 further includes a first inlet section 314 and a first outlet section 315, which are respectively connected to the two ends of the first spiral section 312. The first inlet section 314 is used to introduce a first fluid from the outlet of the condenser 2000, and the first outlet section 315 is used to discharge the first fluid to the second pipe section 320. Similarly, the second pipe section 320 further includes a second inlet section 324 and a second outlet section 325, which are respectively connected to the two ends of the second spiral section 322. The second inlet section 324 is used to receive the first fluid flowing out from the first outlet section 315, and the second outlet section 325 is used to discharge the first fluid to the third pipe section 330. The third pipe section 330 also includes a third inlet section 334 and a third outlet section 335, which are respectively connected to the two ends of the third spiral section 332. The third inlet section 334 is used to receive the first fluid flowing out from the second outlet section 325, and the third outlet section 335 is used to discharge the first fluid to the throttling assembly.

[0051] In this embodiment of the invention, the first inlet section 314 includes a first inner pipe and a first outer pipe. The first inner pipe passes through the first outer pipe and is connected to the inlet section of the first superheated pipe 400. The first outer pipe is connected to the inlet section of the first spiral section 312. The first outlet section 315 includes a second inner pipe and a second outer pipe. The second inner pipe passes through the second outer pipe and is connected to the outlet section of the first superheated pipe 400. The second outer pipe is connected to the outlet section of the first spiral section 312. It should be noted that the structures of the second inlet section 324, the second outlet section 325, the third inlet section 334, and the third outlet section 335 are the same as those of the first inlet section 314 and the first outlet section 315, and will not be described again here.

[0052] Reference Figure 6 As shown, in this embodiment of the invention, the first inlet section 314, the first outlet section 315, the second inlet section 324, the second outlet section 325, the third inlet section 334, and the third outlet section 335 extend along a first direction away from the third annular structure 333, and the first direction is radially arranged along the first annular structure 313. Figure 6 Taking the left and right direction as an example, the first inlet section 314, the first outlet section 315, the second inlet section 324, the second outlet section 325, the third inlet section 334, and the third outlet section 335 all protrude to the right, so that they can extend to the compressor 1000 compartment in the same direction, avoiding complicated pipe routing, simplifying the pipeline layout, and reducing the assembly difficulty of the regenerator 3000.

[0053] Reference Figure 5 and Figure 6As shown, in this embodiment of the invention, the regenerator 3000 further includes a first adapter 340, a second adapter 350, a third adapter 360, a fourth adapter 370, a fifth adapter 380, and a sixth adapter 390, which are sequentially connected to the first inlet section 314, the second inlet section 324, the third inlet section 334, the third outlet section 335, the second outlet section 325, and the first outlet section 315. It is understood that in this embodiment, each adapter has two interfaces: one interface is used to connect to the inner tube of the corresponding inlet or outlet section, and the other interface is used to connect to the outer tube of the corresponding inlet or outlet section.

[0054] Specifically, refer to Figure 6 As shown, one interface of the first adapter 340 is connected to the first inner tube in the first inlet section 314, and the first inner tube is connected to the first superheated pipe 400. The first adapter 340 is led out from one side of this interface and connected to the suction port of the compressor 1000. The other interface is connected to the first outer tube in the first inlet section 314, and the first outer tube is connected to the first spiral section 312. The first adapter 340 is led out from one side of this interface and connected to the outlet of the condenser 2000.

[0055] One interface of the second adapter 350 is connected to the third inner tube in the second inlet section 324, which is connected to the second superheated pipe 500. The second adapter 350 is led out from one side of this interface and connected to the outlet of the second evaporator 7000. The other interface is connected to the third outer tube in the second inlet section 324, which is connected to the second spiral section 322. The second adapter 350 is led out from one side of this interface and connected to the corresponding interface of the fourth adapter 370 through the first connecting pipe 700.

[0056] One interface of the third adapter 360 is connected to the fifth inner tube in the third inlet section 334, which is connected to the third superheated pipe 600. The third adapter 360 is led out from one side of this interface and connected to the outlet of the first evaporator 6000. The other interface is connected to the fifth outer tube in the third inlet section 334, which is connected to the third spiral section 332. The third adapter 360 is led out from one side of this interface and connected to the first throttling element 4000.

[0057] One interface of the fourth adapter 370 is connected to the sixth inner tube in the third outlet section 335. The sixth inner tube is connected to the third superheated pipe 600. After the fourth adapter 370 is led out from one side of this interface, it is connected to the corresponding interface of the sixth adapter 390 through the third connecting pipe 900. The other interface is connected to the sixth outer tube in the third outlet section 335. The sixth outer tube is connected to the third spiral section 332. After the fourth adapter 370 is led out from one side of this interface, it is connected to the corresponding interface of the second adapter 350 through the first connecting pipe 700.

[0058] One interface of the fifth adapter 380 is connected to the fourth inner tube in the second outlet section 325, which is connected to the second superheated pipe 500. After the fifth adapter 380 is led out from one side of this interface, it is connected to the suction port of the compressor 1000. The other interface is connected to the fourth outer tube in the second outlet section 325, which is connected to the second spiral section 322. After the fifth adapter 380 is led out from one side of this interface, it is connected to the corresponding interface of the sixth adapter 390 through the second connecting pipe 800.

[0059] One interface of the sixth adapter 390 is connected to the second inner tube in the first outlet section 315, and the second inner tube is connected to the first superheated pipe 400. After the sixth adapter 390 is led out from one side of this interface, it is connected to the corresponding interface of the fourth adapter 370 through the third connecting pipe 900. The other interface is connected to the second outer tube in the first outlet section 315, and the second outer tube is connected to the first spiral section 312. After the sixth adapter 390 is led out from one side of this interface, it is connected to the corresponding interface of the fifth adapter 380 through the second connecting pipe 800.

[0060] Reference Figure 1 As shown, an embodiment of the present invention also proposes a refrigeration system, which includes: a compressor 1000, a condenser 2000, a throttling component, a first evaporator 6000, a second evaporator 7000, and a regenerative device 3000 as described in the above embodiment; the throttling component includes a first throttling element 4000 and a second throttling element 5000; wherein, the inlet end of the subcooling flow path 100 is connected to the outlet end of the condenser 2000, the outlet end of the subcooling flow path 100 is connected to the first throttling element 4000 and the second throttling element 5000 respectively, the inlet end of the first flow path 210 is connected to the outlet end of the third flow path 230, the outlet end of the first flow path 210 is connected to the compressor 1000, the inlet end of the third flow path 230 is connected to the outlet end of the first evaporator 6000, the inlet end of the second flow path 220 is connected to the outlet end of the second evaporator 7000, and the outlet end of the second flow path 220 is connected to the compressor 1000. The refrigeration system of this invention adopts the regenerator 3000 of the above embodiment. By optimizing the structural design of the regenerator 3000, the overall heat recovery efficiency of the regenerator 3000 is improved. This not only increases the subcooling degree of the high-temperature refrigerant before it enters the throttling component, thereby reducing the generation of flash gas, but also increases the superheat degree of the low-temperature refrigerant entering the return port of the compressor 1000, thereby reducing the risk of liquid slugging in the compressor 1000 and improving the overall energy efficiency and operational reliability of the refrigeration system.

[0061] Since the refrigeration system adopts all the technical solutions of the regenerator 3000 in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments, which will not be repeated here.

[0062] Reference Figure 7 As shown, embodiments of the present invention also propose a refrigeration device, including the refrigeration system of the above embodiments. For example, the refrigeration device can be a refrigerator, a wine cabinet, a medicine cabinet, a display cabinet, etc., and this embodiment does not limit it.

[0063] The refrigeration equipment of this invention adopts the refrigeration system of the above embodiment. By optimizing the refrigeration system, the heat recovery efficiency inside the refrigeration system is improved, thereby reducing the overall energy consumption of the refrigeration equipment during long-term operation. It also improves the refrigeration effect and operational stability of the refrigeration equipment and reduces the failure rate of the refrigeration equipment.

[0064] Taking a refrigerator as an example, the first evaporator 6000 corresponds to the lower-temperature freezer compartment, and the second evaporator 7000 corresponds to the higher-temperature refrigerator compartment. The regeneration device 3000 performs staged subcooling of the first fluid from the outlet of the condenser 2000, thereby increasing the subcooling degree of the refrigerant entering the first evaporator 6000 and the second evaporator 7000, and thus improving the refrigerator's cooling capacity and efficiency. Simultaneously, the regeneration device 3000 ensures that the low-temperature refrigerant flowing out of the outlets of the first evaporator 6000 and the second evaporator 7000 is fully superheated before returning to the compressor 1000, reducing the risk of liquid slugging in the compressor 1000. It should be noted that the second evaporator 7000 in this embodiment is not limited to an evaporator directly providing cooling to the storage space; the second evaporator 7000 can also be an economizer for vapor injection enthalpy enhancement.

[0065] Since the refrigeration equipment adopts all the technical solutions of the refrigeration system in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments, which will not be repeated here.

[0066] Reference Figure 1 As shown, in this embodiment of the invention, the refrigeration device includes an inner liner 8000 and an outer shell 9000. The outer shell 9000 includes a chassis 9200 and a surrounding panel 9100 arranged circumferentially along the chassis 9200. The inner liner 8000 encloses a storage space, and the chassis 9200 is located below the inner liner 8000. In this embodiment, an insulation layer is provided between the inner liner 8000 and the chassis 9200. The insulation layer can isolate heat exchange between the storage space and the external environment, thereby maintaining a low temperature within the storage space. In one example, the insulation layer is made of polyurethane foam material and fills the space between the inner liner 8000 and the chassis 9200.

[0067] Continue to refer to Figure 1As shown, in this embodiment of the invention, the regeneration device 3000 is also disposed in the space between the inner liner 8000 and the chassis 9200. Specifically, it is disposed on the side of the insulation layer close to the inner liner 8000, thereby reducing the heat exchange between the regeneration device 3000 and the external environment and ensuring the regeneration effect of the regeneration device 3000.

[0068] Understandably, the regenerator 3000 occupies a portion of the space between the inner tank 8000 and the chassis 9200, thus reducing the space available for the insulation layer. To maintain the original thickness of the insulation layer, the space between the inner tank 8000 and the chassis 9200 needs to be increased to accommodate both the regenerator 3000 and the original thickness of the insulation layer, which would increase the overall size of the refrigeration equipment. If the total space between the inner tank 8000 and the chassis 9200 remains unchanged, the insulation layer thickness is forced to decrease, resulting in a decline in its thermal insulation performance. Therefore, in this embodiment of the invention, a vacuum insulation plate is provided between the regenerator 3000 and the insulation layer to compensate for the loss of thermal insulation performance caused by the reduced insulation layer thickness.

[0069] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A regenerative device, applied in a refrigeration system, characterized in that, The refrigeration system includes a condenser, a first evaporator, and a second evaporator; the heat recovery device includes: A subcooling flow path is provided for the first fluid flow from the outlet of the condenser; Multiple superheated flow paths are arranged sequentially along the flow direction of the first fluid in the supercooled flow path, and are capable of exchanging heat with the supercooled flow path respectively. The multiple superheated flow paths include a first flow path, a second flow path, and a third flow path. The first flow path and the third flow path are connected to form a heat exchange unit. The heat exchange unit is used to supply the flow of the second fluid from the outlet of the first evaporator. In the flow direction of the first fluid, the inlet end of the heat exchange unit is closer to the outlet end of the subcooling flow path than the outlet end of the heat exchange unit. The second flow path is located between the first flow path and the third flow path and is used to supply the flow of the third fluid from the outlet of the second evaporator. The temperature of the third fluid flowing into the second flow path is higher than the temperature of the second fluid flowing into the heat exchange unit.

2. The regenerative device according to claim 1, characterized in that, The regenerative device includes a subcooling pipe, a first superheating pipe, a second superheating pipe, and a third superheating pipe. The subcooling pipe defines the subcooling flow path and includes a first pipe section, a second pipe section, and a third pipe section arranged along the flow direction of the first fluid. The first superheated pipe defines the first flow path; the second superheated pipe defines the second flow path and is connected to the outlet of the second evaporator; the third superheated pipe defines the third flow path and is connected at one end to the outlet of the first evaporator and at the other end to the first superheated pipe. The first pipe segment is configured to exchange heat with the first superheated pipe, the second pipe segment is configured to exchange heat with the second superheated pipe, and the third pipe segment is configured to exchange heat with the third superheated pipe.

3. The regenerative device according to claim 2, characterized in that, The first superheated pipe extends axially along the first pipe section and passes through the first pipe section, and a first channel is defined between the inner wall of the first pipe section and the outer wall of the first superheated pipe. The second superheated pipe extends axially along the second pipe section and passes through the second pipe section, and a second channel is defined between the inner wall of the second pipe section and the outer wall of the second superheated pipe. The third superheated pipe extends axially along the third pipe section and passes through the third pipe section, and a third channel is defined between the inner wall of the third pipe section and the outer wall of the third superheated pipe. The first channel, the second channel, and the third channel are sequentially connected to form the subcooling flow path.

4. The regenerative device according to claim 3, characterized in that, At least a portion of the first pipe segment extends spirally to form a first annular structure; at least a portion of the second pipe segment extends spirally to form a second annular structure; and at least a portion of the third pipe segment extends spirally to form a third annular structure.

5. The regenerative device according to claim 4, characterized in that, Along the radial direction of the first annular structure, the third annular structure, the second annular structure, and the first annular structure are arranged sequentially from the inside to the outside.

6. The regenerative device according to claim 5, characterized in that, The inlet and outlet ends of the first annular structure, the inlet and outlet ends of the second annular structure, and the inlet and outlet ends of the third annular structure are all arranged in the same direction.

7. A refrigeration system, characterized in that, include: compressor; Condenser; A throttling assembly, including a first throttling element and a second throttling element; First evaporator; Second evaporator; The regenerative apparatus according to any one of claims 1 to 6; The inlet of the subcooling flow path is connected to the outlet of the condenser, the outlet of the subcooling flow path is connected to the first throttling element and the second throttling element respectively, the inlet of the first flow path is connected to the outlet of the third flow path, the outlet of the first flow path is connected to the compressor, the inlet of the third flow path is connected to the outlet of the first evaporator, the inlet of the second flow path is connected to the outlet of the second evaporator, and the outlet of the second flow path is connected to the compressor.

8. A refrigeration device, characterized in that, Includes the refrigeration system as described in claim 7.

9. The refrigeration equipment according to claim 8, characterized in that, The refrigeration equipment includes an inner tank and a chassis, with an insulation layer provided between the inner tank and the chassis; Wherein, the heat recovery device is located on the side of the insulation layer near the inner liner; and / or, A vacuum insulation plate is provided between the heat recovery device and the insulation layer.

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