Compact evaporator structure for refrigeration module
Through the design of leaf vein-like shunt channels and honeycomb-shaped porous plates, the problems of large and uneven cooling of coolant in the evaporator are solved, and efficient and stable refrigeration effect and equipment life are achieved.
Patent Information
- Application Number
- CN202510862480.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-25
- Publication Date
- 2025-08-08
AI Technical Summary
In existing evaporators, the flow of coolant is affected by steering has great resistance, resulting in uneven refrigeration effect and the flow channel structure is easily blocked, affecting the overall efficiency.
A multi-scale flow system is formed by a leaf vein-like shunt channel structure, combined with honeycomb-shaped multi-porous plate and deflector design, and a multi-scale flow system is formed. Through the optimization of gradient aperture and branch angle, uniform distribution of refrigerant and dynamic flow self-balancing are achieved.
It significantly improves heat exchange efficiency and flow stability, reduces turbulence loss, improves refrigeration effect and equipment life, and reduces manufacturing difficulty and cost.
Smart Images
Figure CN120444779A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of evaporators, and in particular to a compact evaporator structure for a refrigeration module. Background Art
[0002] A soft-serve ice cream machine is an automated electromechanical device specifically designed for producing soft-serve ice cream. The evaporator is the core component of its refrigeration system (see the evaporator structure in Chinese Patent Publication No. CN119054766A). It is responsible for transferring the cold energy of the liquid refrigerant to the ice cream mixture through heat exchange, cooling it and solidifying it into soft ice cream. After being reduced in pressure by the expansion valve, the liquid refrigerant enters the evaporator coil at a low temperature and low pressure. Inside the coil, the refrigerant absorbs heat from the evaporator chamber, undergoing a phase change and causing the coil surface temperature to drop sharply. The mixture in the evaporator chamber comes into contact with the low-temperature coil surface, where heat is transferred to the refrigerant through the metal tube wall. The mixture's temperature drops below freezing, and the water begins to freeze into tiny ice crystals, evenly dispersing the fat and air. A motor drives the scraper to rotate at high speed, continuously scraping off the frozen layer formed on the inner wall of the evaporator chamber. Air is stirred in during the scraping process, giving the ice cream a soft texture. The mixture is repeatedly cooled and scraped by the scraper, ultimately reaching a uniform semi-solid state.
[0003] In the evaporator outside the freezing cylinder of the ice cream machine, whether it is a coil evaporator or a plate evaporator, uniformly distributed cooling is achieved by multiple turns of the refrigerant in a single flow channel in contact with the ice-making cylinder. However, multiple turns of the flow channel will cause turbulent loss, excessive pressure drop and structural blockage. The 180-degree turn of the serpentine flow channel causes a surge in local resistance, accounting for 60% to 70% of the overall pressure drop, affecting the overall cooling effect. Reducing the turn of the flow channel will significantly reduce the heat conduction area, resulting in uneven cooling. Few existing products use refrigerant diversion for cooling. Summary of the Invention
[0004] (1) Technical problems solved: In response to the shortcomings of the existing technology, the present invention provides a compact evaporator structure for a refrigeration module, which has the advantages of uniform refrigeration and dynamic flow self-balancing, and solves the problem of high resistance of coolant flow in traditional evaporators due to the influence of turning.
[0005] (II) Technical Solution: To achieve the above-mentioned uniform cooling and dynamic flow self-balancing, the present invention provides the following technical solution: a compact evaporator structure for a refrigeration module, comprising a refrigeration cylinder and an insulation cylinder, wherein the refrigeration cylinder and the insulation cylinder are cylindrical, and a main diversion cavity and a diversion channel for coolant flow are provided between the refrigeration cylinder and the insulation cylinder, wherein the diversion channel is evenly distributed on the outside of the refrigeration cylinder and contacts the refrigeration cylinder, wherein the main diversion cavity is connected to the expansion valve in the refrigeration system, and a honeycomb-shaped porous plate with a gradient pore size distribution is provided at the internal inlet of the main diversion cavity to guide the coolant into the diversion channel; The diversion channels are arranged in a circumferential array on the outer side of the refrigeration cylinder, and the diversion channels are generally shaped like the veins of a leaf. The diversion channels are divided into a main channel and gradually branched into thinner secondary channels, with 2 to 4 branches at each level. A recovery chamber for collecting coolant is provided at the end of the secondary channel; There are guide plates in a circular array on the inner wall of the insulation cylinder, and notches are provided on the guide plates so that the cold air between the refrigeration cylinder and the insulation cylinder can flow in a zigzag shape. The cold air in contact with the diversion channel can flow along the guide plates to the surface of the refrigeration cylinder where no diversion channel is provided.
[0006] The main diversion cavity is arranged on the outer wall of the refrigeration cylinder by welding, and the whole cavity is formed by welding. The internal honeycomb porous plate is fixed in position, and the pores in the honeycomb porous plate are concentrated at the entrance of the secondary channel.
[0007] The diversion channel is divided into three levels of channels, namely a main channel, a secondary channel and a tertiary channel, and the contraction ratio of the diameter of each level of the channel is within 1.5:1.
[0008] The branching angle between the main channel and the secondary channel is 30° to 45°, the branching angle between the secondary channel and the tertiary channel is 20° to 35°, and the branching angle between the secondary channel and the tertiary channel is smaller than the branching angle between the main channel and the secondary channel.
[0009] The transition sections between the main channel and the secondary channel and between the secondary channel and the tertiary channel are provided with rounded corners and adopt streamlined tapered pipes.
[0010] A second diversion cavity is provided between the main channel and the secondary channel, and a third diversion cavity is provided between the secondary channel and the tertiary channel. The structures of the second diversion cavity and the third diversion cavity are the same as those of the main diversion cavity, and the coolant is evenly guided to the secondary channel connected thereto.
[0011] The inner walls of the main channel, the secondary channel and the tertiary channel are coated with a Teflon hydrophobic coating.
[0012] The main channel, secondary channel and tertiary channel are firstly welded to the outside of the refrigeration cylinder by nickel-based welding wire, and then copper welding wire is used to form a multi-layer composite structure at the welding position, and a transition groove is formed.
[0013] The surface of the main channel is provided with fins, and the fins are arranged in an array along the extending direction of the main channel.
[0014] (III) Beneficial Effects: Compared with the prior art, the present invention provides a compact evaporator structure for a refrigeration module, which has the following beneficial effects: 1. The compact evaporator structure used in the refrigeration module forms a multi-scale flow system through a hierarchical channel structure that imitates the veins of leaves. Its diameter shrinks according to Murray's law, and the laminar state is optimized at the microscale. At the macroscale, a high-coverage terminal network is constructed through step-by-step bifurcation. This multi-scale synergistic effect enables the refrigerant to form a self-similar fractal structure during the flow process, which not only retains the high heat transfer efficiency of laminar flow, but also expands the effective heat transfer area by increasing the density of the terminal flow channel. Experiments show that similar fractal structures can increase the heat transfer efficiency per unit volume by more than 40%. The aperture gradient porous plate built into the main diversion cavity forms a composite adjustment mechanism with the branch channel resistance: when the inlet flow velocity is uneven, the dense small holes on the edge generate local resistance compensation, forcing the refrigerant to migrate to the low-pressure area. At the same time, the gradually increasing resistance of the branch channel is coupled with the static pressure cavity to form a dynamic pressure balance similar to the biological vascular system. This self-regulating characteristic makes the system Even with an inlet flow fluctuation of ±30%, the flow deviation of each branch is still controlled within 5%, significantly improving the adaptability to working conditions. The notch design of the guide plate on the inner wall of the insulation cylinder creates a zigzag flow path, which causes the cold air to form a longitudinal vortex structure. More importantly, the secondary flow induced by the vortex flow effectively destroys the development of the thermal boundary layer and improves the local convective heat transfer coefficient. Especially in the non-contact area of the refrigeration cylinder, in phase change control scenarios such as ice cream preparation, the temperature gradient field generated by the graded channel forms a stepped cooling environment. This design causes the mixture to undergo a three-stage phase change process of "mild pre-cooling-deep supercooling-instantaneous nucleation", avoiding both the coarsening of ice crystals caused by insufficient initial supercooling and the uncontrolled crystallization rate caused by the sudden drop in temperature at the end, significantly improving the uniformity of product texture. At the same time, the turbulent energy generated by the graded channel is dissipated step by step in the fractal network, reducing the vibration amplitude of the system, effectively extending the equipment life and improving operational stability.
[0015] 2. The compact evaporator structure used in the refrigeration module greatly reduces the turning loss caused by the change of direction of the refrigerant during the flow process through the appropriate branch angle, maintains the stability of flow rate and pressure, and improves flow efficiency. The optimization of the branch angle reduces the disturbance during the flow of the refrigerant, effectively suppresses the generation of eddy currents, makes the refrigerant flow smoother, and further improves the overall heat exchange performance. The stable flow state not only reduces the noise and vibration during the operation of the equipment, but also improves the overall operation stability and reliability, and extends the service life of the equipment. The uniform flow velocity distribution avoids the phenomenon of local flow velocity being too high or too low, ensures that the temperature of each part of the refrigeration cylinder is more uniform, and improves the cooling effect.
[0016] 3. The compact evaporator structure used in the refrigeration module and the diverter cavity can evenly guide the coolant to the secondary channel connected to it, ensuring the uniform distribution of the refrigerant in the channels at all levels and improving the overall heat exchange efficiency. The diversion effect of the diverter cavity reduces the eddy current and resistance of the refrigerant during the flow process, making the flow more orderly and efficient. The uniform refrigerant distribution avoids local overheating or overcooling, improves the reliability and stability of the refrigeration system, and reduces the occurrence of equipment failures. The design of the diverter cavity simplifies the welding process of the complex channels inside the refrigeration cylinder, reduces the manufacturing difficulty and cost of the equipment, and improves the production speed and efficiency.
[0017] 4. The compact evaporator structure used in the refrigeration module is a multi-layer composite structure formed by nickel-based welding wire and copper welding wire, which combines the advantages of the two materials. Nickel-based welding wire has high strength and good high temperature resistance, can withstand large mechanical stress and thermal stress, and ensure the firmness and reliability of the welding joint; while copper welding wire has good thermal conductivity and corrosion resistance. As a surface welding layer, it can effectively improve the overall heat exchange performance, while protecting the internal materials from corrosion and extending the service life of the equipment. The multi-layer composite structure makes the overall structure connection tighter, enhances the structural strength and reliability of the equipment, and this structure can effectively cope with the damage caused by temperature changes. The design of the transition groove helps to achieve smooth welding transition, reduce stress concentration and welding defects, and improve the quality of the welded joint. At the same time, this design makes the welding process easier to operate and control, which helps to improve welding efficiency and consistency. In addition, the copper welding wire as the surface welding layer has good processing properties and plasticity, which makes the equipment easier to form and process during the manufacturing process, which helps to reduce manufacturing costs and improve production efficiency. At the same time, the smooth surface of the copper welding layer also helps to reduce the resistance of the refrigerant flow and improve the overall heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 Schematic diagram of the structure of the present invention Figure 1 ; Figure 2 Schematic diagram of the structure of the present invention Figure 2 ; Figure 3 Schematic diagram of the arrangement of the diversion channel in embodiment 1 of the present invention Figure 1 ; Figure 4 Schematic diagram of the arrangement of the diversion channel in embodiment 1 of the present invention Figure 2 ; Figure 5 Schematic diagram of the arrangement of the diversion channel in the second embodiment of the present invention Figure 1 ; Figure 6 Schematic diagram of the arrangement of the diversion channel in the second embodiment of the present invention Figure 2 ; Figure 7 This is a schematic diagram of the welding point structure of the present invention; Figure 8 This is a schematic diagram of the guide plate structure of the present invention; Figure 9 This is a schematic diagram of the refrigerant flow in Example 2 of the present invention; Figure 10 This is a schematic diagram of the refrigerant flow in Example 1 of the present invention; Figure 11 Schematic diagram of the internal structure of the main diversion cavity of the present invention.
[0019] In the figure: 1. Refrigeration cylinder; 2. Insulation cylinder; 11. Main diversion chamber; 12. Main flow channel; 21. Guide plate; 111. Secondary diversion chamber; 112. Third diversion chamber; 113. Recovery chamber; 121. Secondary channel; 122. Tertiary channel; 1201. Fin. DETAILED DESCRIPTION
[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0021] Example 1: Please refer to Figures 1-4 , a compact evaporator structure for a refrigeration module, comprising a refrigeration cylinder 1 and an insulation cylinder 2, the refrigeration cylinder 1 and the insulation cylinder 2 are cylindrical, and a main diversion cavity 11 and a diversion channel for coolant flow are provided between the refrigeration cylinder 1 and the insulation cylinder 2, the diversion channel is evenly distributed on the outside of the refrigeration cylinder 1 and in contact with the refrigeration cylinder 1, the main diversion cavity 11 is connected to the expansion valve in the refrigeration system, and a honeycomb porous plate with a gradient pore size distribution is provided at the internal inlet of the main diversion cavity 11, and the pore density gradient distribution (sparse in the center and dense at the edge) compensates for the uneven inlet flow rate and guides the coolant into the diversion channel. In the channel, the diversion channel is arranged in a circular array on the outer side of the refrigeration cylinder 1, and the diversion channel as a whole is shaped like the veins of a leaf, dividing the diversion channel into a main channel and step-by-step branches into finer secondary channels, and the number of branches at each level is 2 to 4, and a recovery chamber 113 for collecting the coolant is provided at the end of the secondary channel. Through step-by-step bifurcation, the density of the terminal flow channel is much higher than that of the inlet, effectively improving the coverage area. The inner wall of the insulation cylinder 2 is provided with a guide plate 21 in a circular array, and a notch is provided on the guide plate 21, so that the cold air between the refrigeration cylinder 1 and the insulation cylinder 2 can form a zigzag flow, refer to Figure 8The cold air in contact with the diversion channel can flow along the guide plate 21 to the surface of the refrigeration cylinder 1 where no diversion channel is set. The diversion channel is divided into three levels of channels, namely the main channel 12, the secondary channel 121 and the tertiary channel 122. The contraction ratio of the diameter of each channel is within 1.5:1. The diameter setting complies with Murray's law to ensure that the flow rate of each branch matches the resistance.
[0022] The refrigerant passes through the compressor, condenser and expansion valve in sequence and enters the main diversion chamber 11. The main diversion chamber 11 is provided with a honeycomb porous plate with a gradient aperture distribution at the inlet of the refrigerant, forcing the refrigerant to be evenly dispersed and smoothly introduced into the main flow channel 12 connected to the main diversion chamber 11, eliminating the uneven inlet flow rate and ensuring that each main flow channel 12 receives the refrigerant evenly. The refrigerant flows in the main flow channel 12 to the secondary channel 121 and the tertiary channel 122. The diameters of the secondary channel 121 and the tertiary channel 122 are smaller than those of the main flow channel 12, and the tertiary channel 122 is smaller than that of the main flow channel 12. The diameter of the channel 122 is the smallest, but the number of the secondary channels 121 and the tertiary channels 122 is more than the main channel 12, and the number of the tertiary channels 122 is the largest. The arrangement density on the outside of the refrigeration cylinder 1 is the highest, which eliminates the problem of insufficient cooling at the edge of the refrigeration cylinder 1 due to the increase in its own temperature when the refrigerant flows at the end edge. At the same time, due to the setting of the secondary channels 121 and the tertiary channels 122, a branch resistance is formed on the main channel 12. After the main diversion chamber 11 is set to increase the static pressure, the flow is balanced by the resistance, so that the refrigerant can be evenly distributed and flow, and the temperature of the refrigeration cylinder 1 can be evenly reduced. In the process of making ice cream, it can effectively avoid the situation where the ice crystal particles are large due to overcooling and affect the taste, or the temperature is insufficient and the production efficiency is low. At the same time, when the refrigerant passes through the main channel 12, the secondary channel 121 and the tertiary channel 122 in turn, the flow velocity will also change due to the change in channel diameter. The change in flow velocity can destroy the thermal boundary layer, reduce local thermal resistance, and improve heat exchange efficiency. An insulating cylinder 2 is also provided on the outside of the refrigeration cylinder 1, so that the main diversion chamber 11 The main channel 12 is arranged between the refrigeration cylinder 1 and the insulation cylinder 2 to reduce the loss of cold generated by the refrigerant from the non-contact side of the refrigeration cylinder 1, and a guide plate 21 is provided on the inner side of the insulation cylinder 2. The guide plate 21 is provided with a notch, so that the cold air between the refrigeration cylinder 1 and the insulation cylinder 2 can flow in a zigzag shape along the guide plate 21. Because of the notch design of the guide plate 21, the cold air in contact with the main channel 12 can flow through the notch of the guide plate 21 due to the convection principle to the area outside the refrigeration cylinder 1 where the main channel 12 is not arranged, thereby ensuring the uniformity of refrigeration.
[0023] The main diversion chamber 11 is welded to the outer wall of the refrigeration cylinder 1, and the whole is welded to form a closed cavity, and the internal honeycomb porous plate is fixed in position. In the traditional soft ice cream machine, a scraper is used to scrape off the ice crystals condensed on the inner wall of the cylinder (i.e., the refrigeration cylinder 1) in the evaporation structure to make ice cream. This application only changes the components of the condenser tube outside the refrigeration cylinder 1 to complete the improvement. The overall structure is not much different from the traditional structure. The pores in the honeycomb porous plate are concentrated at the entrance of the secondary channel. Figure 11 .
[0024] See Figure 3-Figure 4 The branching angle between the main channel 12 and the secondary channel 121 is between 30° and 45°, the branching angle between the secondary channel 121 and the tertiary channel 122 is between 20° and 35°, and the branching angle between the secondary channel 121 and the tertiary channel 122 is smaller than the branching angle between the main channel 12 and the secondary channel 121. By controlling the overall branching angle between 20° and 45°, the steering loss and the generation of eddy currents can be effectively reduced.
[0025] The transition sections between the main channel 12 and the secondary channel 121 and between the secondary channel 121 and the tertiary channel 122 are provided with rounded corners and adopt streamlined tapered tubes, such as conical or curved transitions, to reduce local pressure loss, so that the balance between flow rate gain and pressure loss is better.
[0026] The inner walls of the main channel 12, the secondary channel 121 and the tertiary channel 122 are coated with a Teflon hydrophobic coating to promote the discharge of condensate and reduce the accumulation of liquid refrigerant.
[0027] See Figure 7 The main channel 12, secondary channel 121 and tertiary channel 122 are first welded to the outside of the refrigeration cylinder 1 with nickel-based welding wire, and then copper welding wire is used at the welding position to form a multi-layer composite structure and a transition groove. The surface welding layer made of copper can effectively cope with the influence of deformation and at the same time make the overall structure connection tighter.
[0028] See Figure 4 The surface of the main channel 12 is provided with fins 1201, and the fins 1201 are arrayed along the extension direction of the main channel 12 to increase the heat exchange area.
[0029] Example 2: Please refer to Figure 1-Figure 2 and Figure 5-Figure 6, a compact evaporator structure for a refrigeration module, comprising a refrigeration cylinder 1 and an insulation cylinder 2, the refrigeration cylinder 1 and the insulation cylinder 2 are cylindrical, and a main diversion cavity 11 and a diversion channel for coolant flow are provided between the refrigeration cylinder 1 and the insulation cylinder 2, the diversion channel is evenly distributed on the outside of the refrigeration cylinder 1 and in contact with the refrigeration cylinder 1, the main diversion cavity 11 is connected to the expansion valve in the refrigeration system, and a honeycomb porous plate with a gradient pore size distribution is provided at the internal inlet of the main diversion cavity 11, and the pore density gradient distribution (sparse in the center and dense at the edge) compensates for the uneven inlet flow rate and guides the coolant into the diversion channel. In the channel, the diversion channel is arranged in a circular array on the outer side of the refrigeration cylinder 1, and the diversion channel as a whole is shaped like the veins of a leaf, dividing the diversion channel into a main channel and step-by-step branches into thinner secondary channels, and the number of branches at each level is 2 to 4, and a recovery chamber 113 for collecting the coolant is provided at the end of the secondary channel. Through step-by-step bifurcation, the density of the terminal flow channel is much higher than that of the inlet, which effectively increases the coverage area. The inner wall of the insulation cylinder 2 is provided with a guide plate 21 in a circular array, and a notch is provided on the guide plate 21, so that the cold air between the refrigeration cylinder 1 and the insulation cylinder 2 can form a zigzag flow, refer to Figure 8 The cold air in contact with the diversion channel can flow along the guide plate 21 to the surface of the refrigeration cylinder 1 where no diversion channel is set. The diversion channel is divided into three levels of channels, namely the main channel 12, the secondary channel 121 and the tertiary channel 122. The contraction ratio of the diameter of each channel is within 1.5:1. The diameter setting complies with Murray's law to ensure that the flow rate of each branch matches the resistance.
[0030] The refrigerant passes through the compressor, condenser and expansion valve in sequence and enters the main diversion chamber 11. The main diversion chamber 11 is provided with a honeycomb porous plate with a gradient aperture distribution at the inlet of the refrigerant, forcing the refrigerant to be evenly dispersed and smoothly introduced into the main flow channel 12 connected to the main diversion chamber 11, eliminating the uneven inlet flow rate and ensuring that each main flow channel 12 receives the refrigerant evenly. The refrigerant flows in the main flow channel 12 to the secondary channel 121 and the tertiary channel 122. The diameters of the secondary channel 121 and the tertiary channel 122 are smaller than those of the main flow channel 12, and the tertiary channel 122 is smaller than that of the main flow channel 12. The diameter of the channel 122 is the smallest, but the number of the secondary channels 121 and the tertiary channels 122 is more than the main channel 12, and the number of the tertiary channels 122 is the largest. The arrangement density on the outside of the refrigeration cylinder 1 is the highest, which eliminates the problem of insufficient cooling at the edge of the refrigeration cylinder 1 due to the increase in its own temperature when the refrigerant flows at the end edge. At the same time, due to the setting of the secondary channels 121 and the tertiary channels 122, a branch resistance is formed on the main channel 12. After the main diversion chamber 11 is set to increase the static pressure, the flow is balanced by the resistance, so that the refrigerant can be evenly distributed and flow, and the temperature of the refrigeration cylinder 1 can be evenly reduced. In the process of making ice cream, it can effectively avoid the situation where the ice crystal particles are large due to overcooling and affect the taste, or the temperature is insufficient and the production efficiency is low. At the same time, when the refrigerant passes through the main channel 12, the secondary channel 121 and the tertiary channel 122 in turn, the flow velocity will also change due to the change in channel diameter. The change in flow velocity can destroy the thermal boundary layer, reduce local thermal resistance, and improve heat exchange efficiency. An insulating cylinder 2 is also provided on the outside of the refrigeration cylinder 1, so that the main diversion chamber 11 The main channel 12 is arranged between the refrigeration cylinder 1 and the insulation cylinder 2 to reduce the loss of cold generated by the refrigerant from the non-contact side of the refrigeration cylinder 1, and a guide plate 21 is provided on the inner side of the insulation cylinder 2. The guide plate 21 is provided with a notch, so that the cold air between the refrigeration cylinder 1 and the insulation cylinder 2 can flow in a zigzag shape along the guide plate 21. Because of the notch design of the guide plate 21, the cold air in contact with the main channel 12 can flow through the notch of the guide plate 21 due to the convection principle to the area outside the refrigeration cylinder 1 where the main channel 12 is not arranged, thereby ensuring the uniformity of refrigeration.
[0031] The main diversion chamber 11 is welded to the outer wall of the refrigeration cylinder 1, and the whole is welded to form a closed cavity, and the internal honeycomb porous plate is fixed in position. In the traditional soft ice cream machine, a scraper is used to scrape off the ice crystals condensed on the inner wall of the cylinder (i.e., the refrigeration cylinder 1) in the evaporation structure to make ice cream. This application only changes the components of the condenser tube outside the refrigeration cylinder 1 to complete the improvement. The overall structure is not much different from the traditional structure. The pores in the honeycomb porous plate are concentrated at the entrance of the secondary channel. Figure 11 .
[0032] A second diversion chamber 111 is provided between the main channel 12 and the secondary channel 121, and a third diversion chamber 112 is provided between the secondary channel 121 and the tertiary channel 122. The structures of the second diversion chamber 111 and the third diversion chamber 112 are the same as those of the main diversion chamber 11, and the coolant is evenly guided to the secondary channel connected thereto, and diverted through the diversion chamber, thereby reducing the generation of internal eddy currents and resistance, and at the same time reducing the welding requirements of the equipment.
[0033] The inner walls of the main channel 12, the secondary channel 121 and the tertiary channel 122 are coated with a Teflon hydrophobic coating to promote the discharge of condensate and reduce the accumulation of liquid refrigerant.
[0034] See Figure 7 The main channel 12, secondary channel 121 and tertiary channel 122 are first welded to the outside of the refrigeration cylinder 1 with nickel-based welding wire, and then copper welding wire is used at the welding position to form a multi-layer composite structure and a transition groove. The surface welding layer made of copper can effectively cope with the influence of deformation and at the same time make the overall structure connection tighter.
[0035] See Figure 6 The surface of the main channel 12 is provided with fins 1201, and the fins 1201 are arrayed along the extension direction of the main channel 12 to increase the heat exchange area.
[0036] Working principle: The refrigerant passes through the compressor, condenser and expansion valve in sequence and then enters the main diversion chamber 11. The main diversion chamber 11 is provided with a honeycomb porous plate with a gradient aperture distribution at the inlet of the refrigerant, forcing the refrigerant to be evenly dispersed and smoothly introduced into the main channel 12 connected to the main diversion chamber 11, eliminating the uneven inlet flow rate and ensuring that each main channel 12 receives the refrigerant evenly. The refrigerant flows in the main channel 12 to the secondary channel 121 and the tertiary channel 122. The diameters of the secondary channel 121 and the tertiary channel 122 are smaller than those of the main channel 12, and the tertiary channel 122 is smaller than that of the main channel 12. The diameter of the channel 122 is the smallest, but the number of the secondary channels 121 and the tertiary channels 122 is more than the main channel 12, and the number of the tertiary channels 122 is the largest. The arrangement density on the outside of the refrigeration cylinder 1 is the highest, which eliminates the problem of insufficient cooling at the edge of the refrigeration cylinder 1 due to the increase in its own temperature when the refrigerant flows at the end edge. At the same time, due to the setting of the secondary channels 121 and the tertiary channels 122, a branch resistance is formed on the main channel 12. After the main diversion chamber 11 is set to increase the static pressure, the flow is balanced by the resistance, so that the refrigerant can be evenly distributed and flow, and the temperature of the refrigeration cylinder 1 can be evenly reduced. In the process of making ice cream, it can effectively avoid the situation where the ice crystal particles are large due to overcooling and affect the taste, or the temperature is insufficient and the production efficiency is low. At the same time, when the refrigerant passes through the main channel 12, the secondary channel 121 and the tertiary channel 122 in turn, the flow velocity will also change due to the change in channel diameter. The change in flow velocity can destroy the thermal boundary layer, reduce local thermal resistance, and improve heat exchange efficiency. An insulating cylinder 2 is also provided on the outside of the refrigeration cylinder 1, so that the main diversion chamber 11 The main channel 12 is arranged between the refrigeration cylinder 1 and the insulation cylinder 2 to reduce the loss of cold generated by the refrigerant from the non-contact side of the refrigeration cylinder 1, and a guide plate 21 is provided on the inner side of the insulation cylinder 2. The guide plate 21 is provided with a notch, so that the cold air between the refrigeration cylinder 1 and the insulation cylinder 2 can flow in a zigzag shape along the guide plate 21. Because of the notch design of the guide plate 21, the cold air in contact with the main channel 12 can flow through the notch of the guide plate 21 due to the convection principle to the area outside the refrigeration cylinder 1 where the main channel 12 is not arranged, thereby ensuring the uniformity of refrigeration.
[0037] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.
[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.
Claims
1. A compact evaporator structure for a refrigeration module, comprising a refrigeration cylinder (1) and an insulation cylinder (2), wherein the refrigeration cylinder (1) and the insulation cylinder (2) are cylindrical, and a main diversion cavity (11) and a diversion channel for coolant flow are provided between the refrigeration cylinder (1) and the insulation cylinder (2), the diversion channel is evenly distributed on the outside of the refrigeration cylinder (1) and is in contact with the refrigeration cylinder (1), and the inner wall of the refrigeration cylinder (1) is used for cooling condensation, characterized in that: The main diversion chamber (11) is connected to the expansion valve in the refrigeration system through a condensation pipe. The main diversion chamber (11) is a hollow cavity and is provided with a honeycomb porous plate with a gradient pore size distribution. The main diversion chamber (11) diverts the coolant through the honeycomb porous plate and then introduces it into the diversion channel; The shunt channels are arranged in a circumferential array outside the refrigeration cylinder (1), and the shunt channels are shaped like leaf veins as a whole, dividing the shunt channels into a main channel and gradually branching into thinner secondary channels, with the number of branches at each level being 2 to 4. A recovery chamber (113) for collecting coolant is provided at the end of the secondary channel, and the recovery chamber (113) is connected to the refrigeration system through a condensation pipe to return the collected coolant to the refrigeration system; The inner wall of the heat-insulating cylinder (2) is provided with guide plates (21) in a circumferential array. The guide plates (21) are provided with notches so that the cold air between the refrigeration cylinder (1) and the heat-insulating cylinder (2) can form a zigzag flow. The cold air that contacts the diversion channel can flow along the guide plates (21) to the surface of the refrigeration cylinder (1) where no diversion channel is provided.
2. A compact evaporator structure for a refrigeration module according to claim 1, characterized in that: The main diversion cavity (11) is arranged on the outer wall of the refrigeration cylinder (1) by welding, and the entire cavity is formed by welding, and the internal honeycomb porous plate is fixed in position.
3. A compact evaporator structure for a refrigeration module according to claim 2, characterized in that: The pores in the honeycomb porous plate are concentrated at the entrance of the secondary channel.
4. The compact evaporator structure for a refrigeration module according to claim 1, characterized in that: The diversion channel is divided into three levels of channels: a main channel (12), a secondary channel (121) and a tertiary channel (122), and the contraction ratio of the diameter of each channel is within 1.5:
1.
5. The compact evaporator structure for a refrigeration module according to claim 4, characterized in that: The branching angle between the main channel (12) and the secondary channel (121) is 30° to 45°, the branching angle between the secondary channel (121) and the tertiary channel (122) is 20° to 35°, and the branching angle between the secondary channel (121) and the tertiary channel (122) is smaller than the branching angle between the main channel (12) and the secondary channel (121).
6. The compact evaporator structure for a refrigeration module according to claim 5, characterized in that: The transition sections between the main channel (12) and the secondary channel (121) and between the secondary channel (121) and the tertiary channel (122) are provided with rounded corners and adopt streamlined tapered tubes.
7. The compact evaporator structure for a refrigeration module according to claim 4, characterized in that: A second diversion cavity (111) is provided between the main channel (12) and the secondary channel (121), and a third diversion cavity (112) is provided between the secondary channel (121) and the tertiary channel (122). The second diversion cavity (111) and the third diversion cavity (112) have the same structure as the main diversion cavity (11), and evenly guide the coolant to the secondary channel connected thereto.
8. A compact evaporator structure for a refrigeration module according to any one of claims 4 to 7, characterized in that: The inner walls of the main channel (12), the secondary channel (121) and the tertiary channel (122) are coated with a Teflon hydrophobic coating.
9. The compact evaporator structure for a refrigeration module according to claim 8, characterized in that: The main channel (12), the secondary channel (121) and the tertiary channel (122) are first welded to the outside of the refrigeration cylinder (1) using nickel-based welding wire, and then copper welding wire is used at the welding position to form a multi-layer composite structure and a transition groove.
10. The compact evaporator structure for a refrigeration module according to claim 8, characterized in that: Fins (1201) are provided on the surface of the main channel (12), and the fins (1201) are arranged in an array along the extension direction of the main channel (12).
Citation Information
Patent Citations
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