An energy-saving carbon dioxide cascade low-temperature quick-freezing unit

Abstract

This invention relates to the field of heat exchange equipment technology, specifically to an energy-saving carbon dioxide cascade low-temperature quick-freezing unit, which includes a condenser-evaporator. The condenser-evaporator includes a condenser shell and a first drive mechanism. During the process of the high-temperature medium flowing along the bow-shaped flow channel inside the heat exchange chamber and exchanging heat with the low-temperature medium in the heat exchange tubes, the first drive mechanism can drive all the first baffles and all the second baffles to slide synchronously along the axial direction of the heat exchange tubes, causing the bow-shaped flow channel area to move as a whole. This can push the flow dead zone originally located on the back side of the first baffles to flow, allowing the liquid in the flow dead zone to participate in the effective heat exchange process, thereby improving the heat exchange efficiency of the condenser-evaporator and thus improving the heat exchange efficiency of the entire unit.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, and in particular to an energy-saving carbon dioxide cascade low-temperature quick-freezing unit. Background Technology

[0002] Energy-saving heat exchange devices have become core technological equipment in refrigeration, chemical, and cold chain industries. Their heat exchange efficiency and energy-saving performance directly determine the operating cost and environmental protection level of the entire industrial system. Carbon dioxide cascade cryogenic quick-freezing units, as key equipment in the cryogenic refrigeration field, achieve -50°C or even lower low-temperature environments through cascade heat exchange between a high-temperature stage cycle (usually using a high-temperature medium, such as Freon or ammonia) and a low-temperature stage cycle (using a low-temperature medium, such as carbon dioxide) in the condenser-evaporator. This is widely used in food quick-freezing, chemical freezing, and pharmaceutical refrigeration. The condenser-evaporator, as the energy-saving heat exchange device and core component of the unit, undertakes the core task of heat transfer between the high-temperature and low-temperature stages, and is crucial for achieving energy-saving operation of the unit.

[0003] Currently, the mainstream energy-saving heat exchange devices (condenser-evaporators) in carbon dioxide cascade cryogenic quick-freezing units mostly adopt a shell-and-tube structure. This type of device, by rationally planning the flow direction of the medium in the shell and tube sides, utilizes the high-pressure tolerance of carbon dioxide in the tube side and the flow characteristics of high-temperature media such as ammonia in the shell side to achieve efficient heat exchange between the hot and cold fluids, thereby reducing the overall energy consumption of the unit, which aligns with the design concept of energy-saving heat exchange devices. To enhance the flow disturbance of the medium in the shell side and extend the heat exchange time, shell-and-tube energy-saving heat exchange devices typically incorporate baffles (such as arc-shaped baffles or disc-shaped annular baffles) in the shell side to guide the high-temperature medium around the heat exchange tubes, improving the heat exchange efficiency with carbon dioxide in the tube side, thereby further optimizing the energy-saving effect.

[0004] However, the baffles in traditional shell-and-tube condensers are mostly fixed installations. While these fixed baffles can change the fluid flow direction and increase turbulence, the resulting flow channels are also fixed. During long-term operation, relatively static or extremely low-velocity flow dead zones easily form in areas such as the back of the baffles, shell corners, and the junction with the tube sheet. The existence of these flow dead zones prevents some high-temperature media from participating in effective heat exchange, resulting in a decrease in heat exchange efficiency. Summary of the Invention

[0005] Therefore, it is necessary to provide an energy-saving carbon dioxide cascade low-temperature quick-freezing unit to address the problem of reduced heat exchange efficiency caused by the flow dead zone in the current shell-and-tube energy-saving heat exchange device due to the fixed baffle structure.

[0006] The above objectives are achieved through the following technical solutions: An energy-saving carbon dioxide cascade low-temperature quick-freezing unit includes a condenser-evaporator, wherein the condenser-evaporator comprises: A condenser shell has a heat exchange cavity inside. Multiple heat exchange tubes, all extending axially along the condenser shell, are evenly spaced within the heat exchange cavity. Each heat exchange tube is used to circulate a low-temperature medium. Multiple sets of baffles are also provided within the heat exchange cavity, spaced axially along the condenser shell. Adjacent sets of baffles are distributed on either side of the central axis of the condenser shell. These baffles, together with the condenser shell, form a flow channel that guides the flow of a high-temperature medium. Each of the baffle components includes a first baffle plate and a second baffle plate, both of which are slidably connected to the condenser shell; both the first baffle plate and the second baffle plate are provided with through holes, and each heat exchange tube is slidably connected to the first baffle plate and the second baffle plate through the through holes; A first driving mechanism is used to drive the first baffle and the second baffle to slide synchronously along the axial direction of the heat exchange tube.

[0007] Furthermore, the first driving mechanism includes a first motor and a first power rod. The first power rod extends axially along the heat exchange tube and passes through the first baffle and the second baffle. The first baffle is connected to the second baffle, the first baffle is slidably connected to the first power rod, and the second baffle is threadedly connected to the first power rod. The first motor is used to drive the first power rod to rotate around its own axis, so as to drive the first baffle and the second baffle to slide synchronously along the axial direction of the heat exchange tube.

[0008] Furthermore, it also includes a second driving mechanism and a one-way component; the first baffle plate and the second baffle plate are slidably connected; when the second driving mechanism drives the first baffle plate and the second baffle plate to move away from or closer to each other along the axial direction of the heat exchange tube, the one-way component is used to draw the high-temperature medium in the flow dead zone to the flow region.

[0009] Furthermore, the second drive mechanism includes a second motor, a second power rod, and a sliding sleeve. The second power rod extends axially along the heat exchange tube and passes through the first baffle and the second baffle. The sliding sleeve is coaxially sleeved on the outside of the second power rod and splinedly connected to it. The sliding sleeve has a first thread and a second thread, with opposite thread directions. The first baffle is connected to the first thread, and the second baffle is connected to the second thread. The second drive mechanism provides power for the second power rod to rotate about its own axis.

[0010] Furthermore, the one-way component includes a one-way valve and a nozzle. The one-way valve is disposed in the region where the first baffle is located in the flow dead zone. The one-way valve allows the high-temperature medium in the flow dead zone to flow into the space between the first baffle and the second baffle. The nozzle is opened on the first baffle and is used to discharge the high-temperature medium between the first baffle and the second baffle into the flow region.

[0011] Furthermore, the second baffle is provided with a plurality of buffer sealing rings, each of which is coaxially sleeved on the outside of the corresponding heat exchange tube. The buffer sealing ring is slidably connected to both the second baffle and the heat exchange tube. When the first baffle and the second baffle move closer to or further away from each other, the buffer sealing ring can adjust the radial pressure on the heat exchange tube.

[0012] Furthermore, a first sealing bellows and a second sealing bellows are coaxially sleeved on the outer side of the first power rod, and both the first sealing bellows and the second sealing bellows are rotatably connected to the first power rod; the first sealing bellows is fixedly connected to the first baffle plate, and the second sealing bellows is fixedly connected to the second baffle plate.

[0013] Furthermore, a third sealing bellows and a fourth sealing bellows are coaxially sleeved on the outer side of the sliding sleeve. Both the third sealing bellows and the fourth sealing bellows are rotatably connected to the sliding sleeve and rotatably connected to the second power rod. The third sealing bellows is fixedly connected to the first baffle plate, and the fourth sealing bellows is fixedly connected to the second baffle plate.

[0014] Furthermore, a fifth sealing bellows and a sixth sealing bellows are provided between the first baffle and the second baffle. The fifth sealing bellows is coaxially sleeved on the outside of the sliding sleeve, and the sixth sealing bellows is coaxially sleeved on the outside of the first power rod. One end of the fifth sealing bellows is fixedly connected to the first baffle, and the other end of the fifth sealing bellows is fixedly connected to the second baffle. One end of the sixth sealing bellows is fixedly connected to the first baffle, and the other end of the sixth sealing bellows is fixedly connected to the second baffle.

[0015] Furthermore, an elastic sealing layer is coaxially provided on the outer side of the first baffle and the second baffle, one end of the elastic sealing layer is fixedly connected to the first baffle, and the other end of the elastic sealing layer is fixedly connected to the second baffle.

[0016] The beneficial effects of this invention are: This invention provides an energy-saving carbon dioxide cascade cryogenic quick-freezing unit, comprising a condenser-evaporator. The condenser-evaporator includes a condenser shell and a first drive mechanism. A heat exchange chamber is formed inside the condenser shell, and multiple heat exchange tubes extending axially along the condenser shell are arranged within the heat exchange chamber for the flow of a cryogenic medium. Multiple sets of baffle assemblies are arranged axially at intervals within the heat exchange chamber, with adjacent sets of baffle assemblies distributed on both sides of the central axis of the condenser shell; each set of baffle assemblies includes a first baffle plate and a second baffle plate, both of which are slidably connected to the condenser shell. The other side of the first baffle plate and the other side of the second baffle plate are spaced apart from the condenser shell, forming an arc-shaped flow channel deflection structure. Both the first and second baffle plates have through holes for the heat exchange tubes to pass through, and both are in sliding fit with the heat exchange tubes. During the process of the high-temperature medium flowing along the bow-shaped flow channel inside the heat exchange chamber and exchanging heat with the low-temperature medium in the heat exchange tube, the first driving mechanism can drive all the first baffles and all the second baffles to slide synchronously along the axial direction of the heat exchange tube, causing the bow-shaped flow channel area to move as a whole. This can push the flow dead zone that was originally located on the back side of the first baffle to flow, allowing the liquid in the flow dead zone to participate in the effective heat exchange process, thereby improving the heat exchange efficiency of the condenser-evaporator of the energy-saving heat exchange device, and thus improving the heat exchange efficiency of the entire unit. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an energy-saving carbon dioxide cascade low-temperature quick-freezing unit provided in an embodiment of the present invention; Figure 2 for Figure 1 Top view; Figure 3 for Figure 1 The left view; Figure 4 for Figure 3 Cross-sectional view along section AA; Figure 5 for Figure 4 A magnified schematic diagram of the local structure at point A; Figure 6 for Figure 3 A sectional view along section BB; Figure 7 for Figure 6 A magnified view of the structure at point B in the middle; Figure 8 for Figure 3 A sectional view along section CC; Figure 9 for Figure 8 A magnified schematic diagram of the local structure at point C; Figure 10 for Figure 1 Exploded view; Figure 11 for Figure 10 Schematic diagram of the middle section; Figure 12 for Figure 11 A schematic diagram of the structure of the middle baffle assembly.

[0018] in: 101. Mounting bracket; 111. High-temperature stage compressor; 112. Lubricating oil separator; 113. High-temperature stage condenser; 114. First throttle valve; 115. Regenerator; 116. Second throttle valve; 117. Low-temperature stage evaporator; 118. Low-temperature stage compressor; 120. Condenser-evaporator; 121. Condenser shell; 122. First welded plate; 123. Second welded plate; 130. Heat exchange chamber; 131. First inlet; 132. First outlet; 133. Second inlet; 134. Second outlet; 141. Heat exchange tube; 142. First chamber; 143. Second chamber; 151. First baffle; 152. Second baffle; 153. Through hole; 154. Sealing baffle; 155. Leak-proof sealing surface; 201. Isolation plate; 202. Mounting cavity; 211. First motor; 212. First power rod; 213. First drive gear; 214. First transmission gear; 215. First drive belt; 221. Second motor; 222. Second power rod; 223. Second drive gear; 224. Second transmission gear; 225. Second drive belt; 231. Sliding sleeve; 232. First thread; 233. Second thread; 301. One-way valve; 302. Nozzle; 303. Buffer sealing ring; 304. Groove; 401. First sealing bellows; 402. Second sealing bellows; 403. Third sealing bellows; 404. Fourth sealing bellows; 405. Fifth sealing bellows; 406. Sixth sealing bellows; 407. Elastic sealing layer. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not 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 limiting the invention.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] The following reference Figures 1 to 12 This invention describes an energy-saving carbon dioxide cascade cryogenic quick-freezing unit provided in an embodiment of the present invention. The energy-saving carbon dioxide cascade cryogenic quick-freezing unit includes a mounting frame 101, a high-temperature stage system, a low-temperature stage system, and a condenser-evaporator 120 as the core energy-saving heat exchange device. The high-temperature stage system uses a high-temperature medium such as ammonia or Freon as the refrigerant, while the low-temperature stage system uses a low-temperature medium such as carbon dioxide as the refrigerant. The condenser-evaporator 120 couples the high-temperature stage system and the low-temperature stage system into one unit, serving as both the condenser of the low-temperature stage system and the evaporator of the high-temperature stage system. During operation, the carbon dioxide gas discharged from the low-temperature stage system enters the condenser-evaporator 120, where it is condensed by the heat absorption effect of the refrigerant evaporation in the high-temperature stage system, thereby achieving efficient heat recovery and phase change conversion of the low-temperature stage exhaust gas. The high-temperature stage system includes a high-temperature stage compressor 111, a lubricating oil separator 112, a high-temperature stage condenser 113, and a first throttle valve 114, all of which are fixedly connected to the mounting bracket 101; the low-temperature stage system includes a regenerator 115, a second throttle valve 116, a low-temperature stage evaporator 117, and a low-temperature stage compressor 118, all of which are fixedly connected to the mounting bracket 101.

[0023] The condenser-evaporator 120 includes a condenser shell 121, which is fixedly connected to a mounting bracket 101. A coaxial first welding plate 122 and a second welding plate 123 are fixedly disposed inside the condenser shell 121, spaced radially apart. The condenser shell 121, the first welding plate 122, and the second welding plate 123 together form a heat exchange chamber 130 extending axially. The condenser shell 121 has a first inlet 131 and a first outlet 132, both communicating with the heat exchange chamber 130. The first inlet 131 is located at the bottom of the condenser shell 121, and the first outlet 132 is located at the top of the condenser shell 121, spaced axially apart. The first outlet 132 is connected to a high-temperature stage compressor 111, and the first inlet 131 is connected to a first throttle valve 114.

[0024] Multiple heat exchange tubes 141 extending axially along the condenser shell 121 are arranged within the heat exchange chamber 130. These tubes are evenly spaced and fixedly connected to the first welding plate 122 and the second welding plate 123. The first welding plate 122 and the condenser shell 121 form a sealed first chamber 142, and the second welding plate 123 and the condenser shell 121 form a sealed second chamber 143. One end of each heat exchange tube 141 communicates with the first chamber 142, and the other end communicates with the second chamber 143. The condenser shell 121 also has a second inlet 133 and a second outlet 134. The second inlet 133 communicates with the first chamber 142, and the second outlet 134 communicates with the second chamber 143. The second inlet 133 is connected to the cryogenic compressor 118, and the second outlet 134 is connected to the regenerator 115.

[0025] Multiple sets of axially spaced baffle assemblies are arranged within the heat exchange chamber 130, with adjacent sets of baffle assemblies distributed on both sides of the central axis of the condenser shell 121. Each set of baffle assemblies includes a first baffle plate 151 and a second baffle plate 152, with one side of the first baffle plate 151 and one side of the second baffle plate 152 slidably connected to the condenser shell 121. The other side of the first baffle plate 151 and the other side of the second baffle plate 152 are spaced apart from the condenser shell 121, forming an arc-shaped flow channel deflection structure. Both the first baffle plate 151 and the second baffle plate 152 have through holes 153, and each heat exchange tube 141 is slidably connected to the first baffle plate 151 and the second baffle plate 152 through the through holes 153.

[0026] Specifically, after the high-temperature compressor 111 starts, the discharged high-temperature, high-pressure gaseous ammonia is de-oiled by the lubricating oil separator 112 and then enters the high-temperature condenser 113. The high-temperature condenser 113 includes a first flow chamber and a first flow tube fixedly installed within the first flow chamber. When the gaseous ammonia enters the first flow tube, it exchanges heat with the ambient temperature water or air flowing within the first flow chamber, thereby condensing into low-temperature, high-pressure liquid ammonia. After its flow rate is controlled by a throttle, the liquid ammonia enters the heat exchange chamber 130 of the condenser-evaporator 120 through the first inlet 131 and flows along its internal bow-shaped flow channel towards the first outlet 132. During this flow, the liquid ammonia exchanges heat with the high-temperature, high-pressure carbon dioxide gas in the heat exchange tube 141, causing the liquid ammonia to become a low-temperature, low-pressure gaseous state, which then enters the high-temperature compressor 111 through the first outlet 132, completing the high-temperature cycle.

[0027] Meanwhile, the carbon dioxide gas flowing inside heat exchange tube 141 is condensed into a low-temperature, high-pressure liquid. This low-temperature, high-pressure liquid carbon dioxide then enters the regenerator 115 through the second outlet 134 and, after passing through the second throttling valve 116, enters the low-temperature stage evaporator 117. The low-temperature stage evaporator 117 includes a second flow chamber and a second flow tube fixedly installed within the second flow chamber. When the liquid carbon dioxide enters the second flow tube, it exchanges heat with the refrigerant or air in the second flow chamber, becoming low-temperature, low-pressure gaseous carbon dioxide. This process achieves quick freezing or low-temperature refrigeration of the cold storage. The gaseous carbon dioxide discharged from the low-temperature stage evaporator 117 re-enters the regenerator 115, where it exchanges heat with the low-temperature, high-pressure liquid carbon dioxide from the condenser evaporator 120, thus removing any water vapor that may be carried in the gaseous carbon dioxide. It then enters the low-temperature stage compressor 118 and is compressed into high-temperature, high-pressure carbon dioxide gas. Subsequently, the high-temperature, high-pressure carbon dioxide gas enters the heat exchange tube 141 through the second inlet 133, beginning a new round of low-temperature stage circulation.

[0028] Furthermore, an isolation plate 201 is fixedly installed inside the condenser shell 121, and the heat exchange tube 141 passes through the isolation plate 201 and is fixedly connected to the isolation plate 201. The isolation plate 201, the first welding plate 122, and the condenser shell 121 together form a sealed mounting cavity 202, and a first driving mechanism is installed inside the mounting cavity 202. When the low-temperature and high-pressure liquid ammonia flows along the bow-shaped flow channel inside the heat exchange cavity 130, the first driving mechanism can drive all the first baffles 151 and all the second baffles 152 to slide synchronously along the axial direction of the heat exchange tube 141, causing the bow-shaped flow channel area to move as a whole. This allows the flow dead zone originally located on the back side of the first baffle 151 to flow, that is, the flow dead zone formed at the junction of the left side of the first baffle 151 and the inner wall of the condenser shell 121 enters the flow area. Figure 4The heat exchanger operates in the left and right directions, participating in an effective heat exchange process, thereby improving the heat exchange efficiency of the condenser-evaporator 120 of the energy-saving heat exchange device, and thus improving the heat exchange efficiency of the entire unit.

[0029] In one embodiment, the first drive mechanism includes a first motor 211 and a first power rod 212. The first power rod 212 extends axially along the heat exchange tube 141 and passes through the first baffle 151 and the second baffle 152. It is understood that the first power rod 212 passes through the isolation plate 201 and is rotatably connected to the isolation plate 201. The first baffle 151 and the second baffle 152 are connected, with the first baffle 151 slidably connected to the first power rod 212 and the second baffle 152 threadedly connected to the first power rod 212. The first motor 211 is fixedly mounted on the first welding plate 122, and a first drive gear 213 is fixedly disposed at its output end. A first transmission gear 214 is coaxially fixed on the first power rod 212, and the first drive gear 213 meshes with the first transmission gear 214.

[0030] Specifically, the first motor 211 is started, driving the first drive gear 213 and the first transmission gear 214 to rotate, which in turn drives the first power rod 212 to rotate synchronously around its own axis. Since the second baffle plate 152 is threadedly connected to the first power rod 212, the second baffle plate 152 causes the first baffle plate 151 to tend to slide synchronously along the axial direction of the heat exchange tube 141. Furthermore, a sealing baffle 154 and a leak-proof sealing surface 155 are provided at the connection between the first baffle plate 151 and the second baffle plate 152. The sealing baffle 154 is installed on the first baffle plate 151, and the leak-proof sealing surface 155 is located on the second baffle plate 152, thereby preventing liquid from flowing between the first baffle plate 151 and the second baffle plate 152 when they slide.

[0031] Specifically, multiple first power rods 212 are provided, and these multiple first power rods 212 are evenly distributed on both sides of the isolation plate 201. The first drive mechanism also includes a first drive belt 215, which is looped around the outer side of the corresponding first transmission gears 214 on all the first power rods 212, forming a synchronous belt drive structure. The first drive belt 215 drives the multiple first transmission gears 214 to rotate synchronously, thereby driving all the first power rods 212 to rotate synchronously.

[0032] Understandably, for the sake of structural uniformity and process simplification, the internal structures of both the high-temperature condenser 113 and the low-temperature evaporator 117 can adopt the same structure as the condenser-evaporator 120, thereby achieving structural modularity and performance consistency of the key heat exchange units of the entire unit. Of course, different structures can also be used, depending on the specific circumstances and application scenario determined by the operator.

[0033] In one embodiment, a second drive mechanism and a one-way component are also provided within the mounting cavity 202. The first baffle 151 and the second baffle 152 are slidably connected. When the second drive mechanism drives the first baffle 151 and the second baffle 152 to move away from or towards each other along the axial direction of the heat exchange tube 141, the one-way component can draw liquid from the dead zone to the flow zone, so that the liquid in the dead zone participates in the effective heat exchange process, thereby significantly improving the heat exchange efficiency of the condenser-evaporator 120 of the energy-saving heat exchange device, and thus improving the heat exchange efficiency of the entire unit.

[0034] Specifically, both the sealing baffle 154 and the leak-proof sealing surface 155 are provided with baffles extending radially along the heat exchange tube 141, and the baffles on the sealing baffle 154 and the baffles on the leak-proof sealing surface 155 extend in opposite directions to prevent the first baffle 151 and the second baffle 152 from disengaging when they slide against each other.

[0035] In one embodiment, the second drive mechanism includes a second motor 221, a second drive rod 222, and a sliding sleeve 231. The second drive rod 222 extends axially along the heat exchange tube 141 and passes through the first baffle 151 and the second baffle 152. It is understood that the second drive rod 222 passes through the isolation plate 201 and is rotatably connected to the isolation plate 201. The sliding sleeve 231 is coaxially sleeved on the outside of the second drive rod 222 and splinedly connected to the second drive rod 222. The sliding sleeve 231 has a first thread 232 and a second thread 233, with opposite thread directions. The first baffle 151 is connected to the first thread 232, and the second baffle 152 is connected to the second thread 233. The second motor 221 is fixedly mounted on the first welding plate 122, and a second drive gear 223 is fixedly provided at its output end. A second transmission gear 224 is coaxially fixed on the second power rod 222, and the second drive gear 223 meshes with the second transmission gear 224.

[0036] Specifically, when the first motor 211 is started, driving the first baffle plate 151 and the second baffle plate 152 to slide synchronously to the right, that is... Figure 9 In the left-right direction, the second motor 221 is started. The second motor 221 drives the second drive gear 223 and the second transmission gear 224 to rotate, which in turn drives the second power rod 222 to rotate synchronously around its own axis. This drives the first baffle plate 151 and the second baffle plate 152 to move away from each other, increasing the gap between the first baffle plate 151 and the second baffle plate 152 and creating a negative pressure state between them.

[0037] Specifically, multiple second drive rods 222 are provided, and these multiple second drive rods 222 are evenly distributed on both sides of the isolation plate 201. The second drive mechanism also includes a second drive belt 225, which is looped around the outer side of the corresponding second transmission gears 224 on all the second drive rods 222, forming a synchronous belt drive structure. The second drive belt 225 drives the multiple second transmission gears 224 to rotate synchronously, thereby driving all the second drive rods 222 to rotate synchronously.

[0038] In one embodiment, the one-way component includes a one-way valve 301 and a nozzle 302. The one-way valve 301 is disposed in the region of the first baffle 151 located in the flow dead zone, allowing liquid within the flow dead zone to flow between the first baffle 151 and the second baffle 152. The nozzle 302 is formed on the first baffle 151, extending radially along the heat exchange tube 141 and penetrating the first baffle 151. The radial dimension of the nozzle 302 gradually decreases along the axial direction of the heat exchange tube 141 towards the second inlet 133. Specifically, when the first baffle 151 and the second baffle 152 are far apart, a negative pressure state draws liquid from the flow dead zone into the space between the first baffle 151 and the second baffle 152 through the one-way valve 301. Subsequently, the second motor 221 drives the second power rod 222 to rotate in the opposite direction, driving the first baffle 151 and the second baffle 152 to move closer together. This reduces the gap between the first baffle 151 and the second baffle 152, thereby injecting the liquid between the first baffle 151 and the second baffle 152 into the flow region through the nozzle 302. This process actively drives the liquid in the dead zone into the effective heat exchange region, allowing it to participate in heat exchange. Specifically, multiple nozzles 302 are provided in the central region of the first baffle 151, and these nozzles are evenly spaced on the first baffle 151 to create a wider jet turbulence, thereby significantly improving the heat exchange efficiency of the energy-saving heat exchange device condenser-evaporator 120, and thus improving the overall heat exchange efficiency of the unit.

[0039] Specifically, the nozzles 302 on adjacent first baffles 151 are positioned differently depending on the flow direction of the liquid in the bow-shaped flow channel. For example, the nozzle 302 on the first baffle 151 closest to the first inlet 131 is located near the bottom of the heat exchange tube 141; the nozzle 302 on the next adjacent first baffle 151 is located near the top of the heat exchange tube 141, and so on. It can be understood that when the liquid flows from top to bottom through the heat exchange tube 141, i.e. Figure 4 and Figure 5In the vertical direction, when the liquid passes through the heat exchange tube 141, due to the Karman vortex street effect, a series of alternating, periodic vortex structures are formed on the back flow side of the heat exchange tube 141, that is, at the bottom of the heat exchange tube 141. This causes a decrease in pressure at the bottom of the heat exchange tube 141, which not only causes vibration of the heat exchange tube 141, but also weakens the heat exchange effect on that side. At this time, the liquid ejected from the nozzle 302 located at the bottom of the heat exchange tube 141 will disturb its vortex structure, weaken the Karman vortex street effect, reduce the vibration of the heat exchange tube 141, and improve the heat exchange efficiency. Similarly, when the flow direction is from bottom to top, the nozzle 302 located at the top of the heat exchange tube 141 can play the same role, eliminating the low-pressure area at the top through jet disturbance, achieving a comprehensive effect of stable flow and improved heat exchange efficiency.

[0040] Meanwhile, when the liquid flows through the bow-shaped flow channel formed by the first baffle 151 and the second baffle 152, it still maintains a relatively large laminar flow state in the flow area, resulting in relatively limited heat transfer performance. At this time, the liquid ejected at high speed from the nozzle 302 enters the flow area, directly disturbing the laminar boundary layer, effectively breaking the fluid stratification, and promoting the change of flow from laminar to turbulent, thereby improving the heat exchange efficiency of the energy-saving heat exchange device condenser-evaporator 120, and thus improving the heat exchange efficiency of the entire unit.

[0041] In one embodiment, a plurality of buffer sealing rings 303 are provided within the second baffle 152. Each buffer sealing ring 303 is coaxially sleeved on the outside of the corresponding heat exchange tube 141, and the buffer sealing ring 303 is slidably connected to both the second baffle 152 and the heat exchange tube 141. At the location where the buffer sealing ring 303 is installed, a slot 304 is formed on the side of the second baffle 152 near the nozzle 302. The slot 304 communicates with the area between the buffer sealing ring 303 and the first baffle 151 and the second baffle 152. Specifically, when the first baffle 151 and the second baffle 152 approach each other, the liquid between the first baffle 151 and the second baffle 152 compresses the buffer sealing ring 303 through the slot 304, causing the buffer sealing ring 303 to apply radial pressure to the heat exchange tube 141 for elastic support, thereby reducing the vibration of the heat exchange tube 141.

[0042] Understandably, during liquid flow, the liquid velocity decreases along the flow direction, resulting in stronger vibrations on the portion of heat exchange tube 141 closer to the first inlet 131. Therefore, along the axial direction of heat exchange tube 141 towards the first inlet 131, the pitch of the second thread 233 on the sliding sleeve 231 gradually increases; that is, the pitch of the second thread 233 on the sliding sleeve 231 is larger the closer it is to the first inlet 131. When the rotation of heat exchange tube 141 drives relative displacement between the first baffle 151 and the second baffle 152, the relative displacement between the first baffle 151 and the second baffle 152 closer to the first inlet 131 is greater, and more liquid is drawn into the space between the first baffle 151 and the second baffle 152. When the first baffle 151 and the second baffle 152 approach each other, the liquid is squeezed out at a faster speed. The faster the flow rate, the greater the pressure exerted on the buffer sealing ring 303, resulting in increased compression of the buffer sealing ring 303. This, in turn, increases the elastic support force on the heat exchange tube 141, further reducing the vibration of the heat exchange tube 141. At the same time, the buffer sealing ring 303 also serves a sealing function, preventing liquid between the first baffle 151 and the second baffle 152 from leaking through the second baffle 152.

[0043] In one embodiment, a first sealing bellows 401 and a second sealing bellows 402 are coaxially sleeved on the outer side of the first power rod 212. Both the first sealing bellows 401 and the second sealing bellows 402 are rotatably and sealingly connected to the first power rod 212. The first sealing bellows 401 is fixedly connected to the first baffle 151, and the second sealing bellows 402 is fixedly connected to the second baffle 152. Specifically, both the first sealing bellows 401 and the second sealing bellows 402 serve a sealing function. The first sealing bellows 401 prevents liquid from flowing into the assembly gap between the first baffle 151 and the first power rod 212, while the second sealing bellows 402 prevents liquid from flowing into the assembly gap between the second baffle 152 and the first power rod 212.

[0044] In one embodiment, a third sealing bellows 403 and a fourth sealing bellows 404 are coaxially sleeved on the outer side of the sliding sleeve 231. Both the third and fourth sealing bellows 403 and 404 are rotatably and sealingly connected to the sliding sleeve 231, and are also rotatably and sealingly connected to the second power rod 222. The third sealing bellows 403 is fixedly connected to the first baffle 151, and the fourth sealing bellows 404 is fixedly connected to the second baffle 152. Specifically, both the third and fourth sealing bellows 403 and 404 serve a sealing function. The third sealing bellows 403 prevents liquid from flowing into the assembly gap between the first baffle 151 and the sliding sleeve 231, while the fourth sealing bellows 404 prevents liquid from flowing into the assembly gap between the second baffle 152 and the sliding sleeve 231.

[0045] In one embodiment, a fifth sealing bellows 405 and a sixth sealing bellows 406 are disposed between the first baffle 151 and the second baffle 152. The fifth sealing bellows 405 is coaxially sleeved on the outside of the sliding sleeve 231, and the sixth sealing bellows 406 is coaxially sleeved on the outside of the first power rod 212. One end of the fifth sealing bellows 405 is fixedly connected to the first baffle 151, and the other end of the fifth sealing bellows 405 is fixedly connected to the second baffle 152. One end of the sixth sealing bellows 406 is fixedly connected to the first baffle 151, and the other end of the sixth sealing bellows 406 is fixedly connected to the second baffle 152. Specifically, both the fifth sealing bellows 405 and the sixth sealing bellows 406 serve a sealing function. The fifth sealing bellows 405 can prevent liquid from flowing into the assembly gap between the first baffle plate 151 and the second baffle plate 152 and the sliding sleeve 231; the sixth sealing bellows 406 can prevent liquid from flowing into the assembly gap between the first baffle plate 151 and the second baffle plate 152 and the first power rod 212.

[0046] In one embodiment, an elastic sealing layer 407 is coaxially sleeved on the outer sides of the first baffle 151 and the second baffle 152. One end of the elastic sealing layer 407 is fixedly connected to the first baffle 151, and the other end is fixedly connected to the second baffle 152. Specifically, when the first baffle 151 and the second baffle 152 are far apart, the elastic sealing layer 407 always abuts against the inner wall of the condenser shell 121 under its own elastic force to prevent liquid from flowing into the assembly gap between the first baffle 151, the second baffle 152 and the condenser shell 121. When the first baffle 151 and the second baffle 152 are close to each other, the elastic sealing layer 407 is subjected to axial compression and generates radial expansion, thereby further enhancing its pressing force and sealing effect on the inner wall of the condenser shell 121.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An energy-saving carbon dioxide cascade low-temperature quick-freezing unit, comprising a condenser-evaporator, characterized in that, The condenser-evaporator includes: A condenser shell has a heat exchange cavity inside. Multiple heat exchange tubes, all extending axially along the condenser shell, are evenly spaced within the heat exchange cavity. Each heat exchange tube is used to circulate a low-temperature medium. Multiple sets of baffles are also provided within the heat exchange cavity, spaced axially along the condenser shell. Adjacent sets of baffles are distributed on either side of the central axis of the condenser shell. These baffles, together with the condenser shell, form a flow channel that guides the flow of a high-temperature medium. Each of the baffle components includes a first baffle plate and a second baffle plate, both of which are slidably connected to the condenser shell; both the first baffle plate and the second baffle plate are provided with through holes, and each heat exchange tube is slidably connected to the first baffle plate and the second baffle plate through the through holes; A first driving mechanism is used to drive the first baffle and the second baffle to slide synchronously along the axial direction of the heat exchange tube.

2. The energy-saving carbon dioxide cascade low-temperature quick-freezing unit according to claim 1, characterized in that, The first driving mechanism includes a first motor and a first power rod. The first power rod extends axially along the heat exchange tube and passes through the first baffle and the second baffle. The first baffle is connected to the second baffle, the first baffle is slidably connected to the first power rod, and the second baffle is threadedly connected to the first power rod. The first motor is used to drive the first power rod to rotate around its own axis, so as to drive the first baffle and the second baffle to slide synchronously along the axial direction of the heat exchange tube.

3. The energy-saving carbon dioxide cascade low-temperature quick-freezing unit according to claim 2, characterized in that, It also includes a second drive mechanism and a one-way component; the first baffle and the second baffle are slidably connected; when the second drive mechanism drives the first baffle and the second baffle to move away from or closer to each other along the axial direction of the heat exchange tube, the one-way component is used to draw the high-temperature medium in the flow dead zone to the flow region.

4. The energy-saving carbon dioxide cascade low-temperature quick-freezing unit according to claim 3, characterized in that, The second drive mechanism includes a second motor, a second power rod, and a sliding sleeve. The second power rod extends axially along the heat exchange tube and passes through the first baffle and the second baffle. The sliding sleeve is coaxially sleeved on the outside of the second power rod and splinedly connected to it. The sliding sleeve has a first thread and a second thread, with opposite thread directions. The first baffle is connected to the first thread, and the second baffle is connected to the second thread. The second drive mechanism provides power for the second power rod to rotate about its own axis.

5. The energy-saving carbon dioxide cascade low-temperature quick-freezing unit according to claim 3, characterized in that, The one-way component includes a one-way valve and a nozzle. The one-way valve is disposed in the region where the first baffle is located in the flow dead zone. The one-way valve allows the high-temperature medium in the flow dead zone to flow into the space between the first baffle and the second baffle. The nozzle is opened on the first baffle and is used to discharge the high-temperature medium between the first baffle and the second baffle into the flow region.

6. The energy-saving carbon dioxide cascade low-temperature quick-freezing unit according to claim 3, characterized in that, The second baffle is provided with a plurality of buffer sealing rings, each of which is coaxially sleeved on the outside of the corresponding heat exchange tube. The buffer sealing ring is slidably connected to both the second baffle and the heat exchange tube. When the first baffle and the second baffle move closer to or further away from each other, the buffer sealing ring can adjust the radial pressure on the heat exchange tube.

7. The energy-saving carbon dioxide cascade low-temperature quick-freezing unit according to claim 2, characterized in that, A first sealing bellows and a second sealing bellows are coaxially sleeved on the outer side of the first power rod. Both the first sealing bellows and the second sealing bellows are rotatably connected to the first power rod. The first sealing bellows is fixedly connected to the first baffle plate, and the second sealing bellows is fixedly connected to the second baffle plate.

8. The energy-saving carbon dioxide cascade low-temperature quick-freezing unit according to claim 4, characterized in that, The outer side of the sliding sleeve is coaxially fitted with a third sealing bellows and a fourth sealing bellows. Both the third sealing bellows and the fourth sealing bellows are rotatably connected to the sliding sleeve and rotatably connected to the second power rod. The third sealing bellows is fixedly connected to the first baffle plate, and the fourth sealing bellows is fixedly connected to the second baffle plate.

9. The energy-saving carbon dioxide cascade low-temperature quick-freezing unit according to claim 4, characterized in that, A fifth sealing bellows and a sixth sealing bellows are provided between the first baffle and the second baffle. The fifth sealing bellows is coaxially sleeved on the outside of the sliding sleeve, and the sixth sealing bellows is coaxially sleeved on the outside of the first power rod. One end of the fifth sealing bellows is fixedly connected to the first baffle, and the other end of the fifth sealing bellows is fixedly connected to the second baffle. One end of the sixth sealing bellows is fixedly connected to the first baffle, and the other end of the sixth sealing bellows is fixedly connected to the second baffle.

10. The energy-saving carbon dioxide cascade low-temperature quick-freezing unit according to claim 1, characterized in that, An elastic sealing layer is coaxially provided on the outer side of the first baffle and the second baffle. One end of the elastic sealing layer is fixedly connected to the first baffle, and the other end of the elastic sealing layer is fixedly connected to the second baffle.

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