Dry type refrigerant evaporator

Abstract

The utility model relates to a dry type refrigerant evaporator. According to the scheme, the dry type refrigerant evaporator comprises a shell, an evaporator core, a hard pull rod, a deflection baffle and a length adjusting structure. Wherein the hard pull rods are parallel to the length direction of the shell, the deflection baffles are evenly arranged at intervals and provided with pull rod fixing holes, and the length adjusting structures fix the hard pull rods between the end covers, so that the evaporator core is fixed. The area of hole position notches in the deflection baffles accounts for 16-25%, and the heat exchange efficiency is optimized.

Description

Technical Field

[0001] The utility model relates to an evaporator, in particular to a dry refrigerant evaporator. Background Art

[0002] The evaporator is a key heat exchange device in the refrigeration system. It is used to evaporate the refrigerant liquid into gas after absorbing heat, thereby reducing the temperature of the cooled medium. Evaporators can be divided into dry type, recirculation type, full liquid type and spray type according to the different refrigerant charging and evaporation methods. Dry evaporators are widely used in air conditioning, refrigeration and freezing fields due to their simple structure, good heat dissipation effect and high refrigeration efficiency.

[0003] In the refrigeration system of the refrigerated compressed air dryer, the performance of the dry evaporator is affected by the size of the gap in the baffle. If the gap is too large, it will cause a dead zone in the flow and reduce the heat transfer efficiency; if the gap is too small, the impact force of the compressed air may be too large, causing the evaporator core to move in the shell, thereby causing damage to the connection parts of the refrigeration pipes, such as deformation, breakage or disengagement.

[0004] In view of the problems existing in the practical application of the existing dry evaporator, an improved dry refrigerant evaporator is urgently needed to improve the heat exchange efficiency and significantly reduce the risk of refrigeration pipe rupture to meet the needs of efficient and stable operation. Utility Model Content

[0005] The purpose of the utility model is to provide a dry refrigerant evaporator in view of the above problems existing in the prior art.

[0006] In order to achieve the above application purpose, the utility model adopts the following technical solution: a dry refrigerant evaporator includes a shell, end covers are provided at both ends of the shell in the length direction, an evaporator core is provided inside, and the evaporator core is provided with a liquid inlet pipe, a heat exchange pipe and a return air pipe, and also includes:

[0007] A hard pull rod is arranged inside the shell and parallel to the length direction of the shell;

[0008] The baffle plates are evenly spaced along the length of the evaporator core and are provided with tie rod fixing holes for the hard tie rods to pass through;

[0009] The length adjustment structure is respectively arranged at both ends of each rigid tie rod in the length direction, and is used to fix the rigid tie rod between the two end covers to achieve the fixation of the evaporator core;

[0010] The hole gaps on each baffle plate account for 16-25% of its total area.

[0011] Furthermore, each length adjustment structure is an internal thread joint provided at the end of the hard pull rod and a single-head screw capable of being screwed with the internal thread joint.

[0012] Furthermore, each length adjustment structure is also provided with a screw locking device.

[0013] Furthermore, a heat exchange fin array is provided on the heat exchange tube, and the heat exchange tube is arranged in an equilateral triangle arrangement.

[0014] Furthermore, the fin array spacing of the heat dissipation fin array is 15-24 mm.

[0015] Furthermore, the heat dissipation fins of the heat dissipation fin array are coated aluminum foils with a hydrophilic angle of 20°≤θ≤30°.

[0016] Furthermore, the coated aluminum foil substrate has a thickness of 0.1-0.2 mm and is coated with an organic resin lubricating layer.

[0017] Furthermore, each baffle is an arcuate baffle with a liquid-passing hole, the hole gaps are arranged up and down, and the baffle spacing is 120 to 200 mm.

[0018] Furthermore, an elastic sealing member is provided at the contact portion between the arcuate baffle and the shell.

[0019] Furthermore, the hard pull rods are located on four side surfaces of the evaporator core except the two end surfaces.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. Enhanced structural stability: By setting length adjustment structures at both ends of the hard tie rod, such as internal thread joints and single-head screws, the evaporator core can be firmly fixed between the two end covers of the shell, effectively preventing the evaporator core from being displaced due to the impact force of compressed air, thereby reducing the risk of refrigeration pipe breakage.

[0022] 2. Improved heat exchange efficiency: The notch area of ​​the baffle is controlled at 16-25%, which optimizes the fluid dynamics characteristics, reduces the flow dead zone, and further improves the heat exchange performance.

[0023] 3. Optimization of heat dissipation performance: The heat exchange tube is equipped with heat dissipation fins on the outside, especially the coated aluminum foil fins with a hydrophilic angle of 20°≤θ≤30°, which can increase the surface area and improve the heat dissipation efficiency. The fin row spacing is controlled at 15-24mm, which further optimizes the air flow and heat exchange.

[0024] 4. Enhanced corrosion resistance and lubricity: The coated aluminum foil is coated with an organic resin lubrication layer, which not only improves the corrosion resistance of the evaporator, but also enhances the lubricity of the fins, helps to reduce friction loss during the flow of refrigerant, and improves system efficiency. It effectively prevents the medium from corroding the metal material and extends the service life of the evaporator.

[0025] 5. Improved material strength and durability: The thickness of the coated aluminum foil substrate is controlled at 0.1-0.2 mm, which ensures the strength and durability of the fins, enabling them to withstand various loads in long-term operation.

[0026] 6. Improved sealing performance: Elastic seals are laid at the contact point between the arched baffle and the shell to ensure the sealing performance of the evaporator, prevent refrigerant leakage, and improve the reliability of the system.

[0027] 7. Easy maintenance and cleaning: Since the evaporator core can be pulled out of the shell by disassembling the length adjustment structure and end cover, it is easy to maintain and clean, extending the service life of the equipment.

[0028] 8. Enhanced adaptability: By adjusting the length adjustment structure, the evaporator core can be adjusted according to actual needs, which improves the adaptability and flexibility of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the utility model;

[0030] Figure 2 It is a structural schematic diagram of the evaporator core of the utility model;

[0031] Figure 3 This is a structural diagram of the arcuate baffle of the utility model;

[0032] Figure 4 It is a schematic diagram of the heat dissipation fin of the utility model.

[0033] In the figure, 1. shell; 2. evaporator core; 3. end cover; 4. deflector baffle; 5. aluminum foil fin; 6. hard pull rod; 7. length adjustment structure; 8. elastic seal; 11. cooling medium inlet; 12. cooled medium outlet; 21. heat exchange tube; 22. liquid inlet pipe; 23. return air pipe; 41. liquid hole; 42. heat exchange tube installation hole; 43. pull rod fixing hole. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0035] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0036] like Figure 1-4 As shown, a dry refrigerant evaporator has a structure including a shell 1 made of high-strength metal material, one side of the shell 1 is provided with an inlet (cooling medium inlet 11) for the medium to be cooled (such as coolant), and the other side is provided with an outlet for the cooled medium (cooled medium outlet 12). An evaporator core 2 is installed in the shell 1, and the evaporator core 2 is composed of a plurality of copper heat exchange tubes 21, which are interconnected by precise U-shaped elbows to form a continuous heat exchange path, and the two ends are respectively welded to the liquid inlet pipe 22 and the return air pipe 23. The liquid inlet pipe 22 and the return air pipe 23 pass through the end cover 3 and are connected to the external refrigeration system pipeline through flanges, ensuring good sealing and convenient installation and maintenance.

[0037] Several arcuate baffles 4 are arranged inside the evaporator core 2. These baffles have carefully designed liquid holes 41, and the gap area (including the liquid holes 41, the installation holes of the heat exchange tube 21 and the tie rod fixing holes 43) is strictly controlled to 20% (between 16-25%) of the total area of ​​the baffle 4, which not only ensures the smooth passage of airflow, but also effectively avoids the formation of flow dead zones, thereby improving the heat exchange efficiency. The vertical distance between the baffles is maintained at 150mm (between 120-200mm), ensuring the reasonable layout of the airflow or liquid channel. In addition, a low-temperature resistant rubber sealing ring (elastic sealing member 8) is attached to the bottom of each baffle 4 and the contact position with the inner wall of the shell 1 to ensure the airtightness of the system.

[0038] In order to achieve stable fixation of the evaporator core 2, this embodiment uses four pairs of hard tie rods 6, with internal threaded joints at both ends of the tie rods, and connected to the threaded holes on the end cover 3 through external single-head screws (length adjustment structure 7). The user can accurately adjust the length of the tie rod by rotating the screw, and then fasten the evaporator core 2 inside the housing 1 to prevent displacement caused by external pressure fluctuations. In order to prevent the screw from loosening during operation, a screw locking device is specially designed to ensure stability during long-term operation.

[0039] Preferably, a screw locking device is provided in the length adjustment structure 7, including but not limited to a radial locking nut, a spring locking nut, a square locking nut, etc., all of which are products that can be purchased on the market, and their structure and principle are not described in detail here.

[0040] In order to further improve the heat dissipation capacity, the outer surface of the heat exchange tube 21 is provided with an aluminum foil fin 5 with a hydrophilic coating (an array of multiple heat exchange tubes 21 is arranged on an aluminum foil fin 5, and multiple aluminum foil fins 5 are arranged along the length direction of the heat exchange tube 21). The contact angle of the coating is set to 25°, which not only ensures good wettability, but also promotes the effective removal of condensed water. The fin row spacing is carefully designed to be 20mm, which not only ensures unimpeded airflow, but also maximizes the heat exchange area. The base material thickness of the aluminum foil material is 0.15mm, which is both light and has sufficient mechanical strength. The surface is also coated with an additional layer of organic resin lubrication layer, which effectively reduces the refrigerant flow resistance and improves the energy efficiency of the overall system. It can also play an anti-corrosion and protective role, effectively preventing the medium from corroding the metal material and extending the service life of the evaporator.

[0041] Among them, the angle formed by the droplet standing on the plane of the aluminum foil or other plate strip is called the contact angle, which is called the hydrophilic angle here. The smaller the hydrophilic angle, the better the hydrophilicity; conversely, the larger the hydrophilic angle, the worse the hydrophilicity. For non-hydrophilic aluminum foil, the smaller the sheet spacing, the greater the pressure drop ratio, and the lower the heat exchange efficiency of the evaporator. For hydrophilic coated fins, the smaller the contact angle, the lower the pressure drop ratio, and the better the heat exchange efficiency of the evaporator. At the same time, the evaporator dry-wet cycle and corrosion resistance experiments show that when the water contact angle is 25°, the hydrophilicity of the heat exchange aluminum foil is more persistent, so the preferred contact angle in this embodiment is set to 25°.

[0042] In summary, the dry refrigerant evaporator of this embodiment not only solves the problems of loose fixation, low heat exchange efficiency and easy damage that may be encountered in the use of traditional dry evaporators through innovative design, but also significantly improves the heat exchange performance, durability and maintenance convenience of the equipment through a series of optimization measures. It is a major technological innovation in the field of refrigeration and air-conditioning.

[0043] The parts not described in detail in the present invention are prior art, so the present invention does not describe them in detail.

[0044] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0045] Although this article uses more terms such as shell 1, evaporator core 2, end cover 3, baffle 4, aluminum foil fin 5, hard pull rod 6, length adjustment structure 7, elastic seal 8, cooling medium inlet 11, cooled medium outlet 12, heat exchange tube 21, liquid inlet pipe 22, return air pipe 23, liquid hole 41, heat exchange tube 21 installation hole, pull rod fixing hole 43, etc., it does not exclude the possibility of using other terms. The use of these terms is only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

[0046] The present utility model is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all those having the same or similar technical solutions as the present utility model fall within the protection scope of the present utility model.

Claims

1. A dry refrigerant evaporator, comprising a shell, end covers are provided at both ends of the shell in the length direction, an evaporator core is provided inside, and a liquid inlet pipe, a heat exchange pipe and a return air pipe are provided on the evaporator core, characterized in that: Also includes: A hard pull rod, disposed in the shell and parallel to the length direction of the shell; The baffle plates are evenly spaced along the length direction of the evaporator core and are provided with tie rod fixing holes for the hard tie rods to pass through; A length adjustment structure is respectively arranged at both ends of the length direction of each of the hard pull rods, and is used to fix the hard pull rod between the two end covers to achieve the fixation of the evaporator core; The hole openings on each of the baffle plates account for 16-25% of the total area of ​​the baffle plate.

2. A dry refrigerant evaporator according to claim 1, characterized in that: Each of the length adjustment structures is an internal thread joint arranged at the end of the hard pull rod and a single-head screw that can be screwed with the internal thread joint.

3. The dry refrigerant evaporator according to claim 1, characterized in that: Each of the length adjustment structures is also provided with a screw locking device.

4. The dry refrigerant evaporator according to claim 1, characterized in that: The heat exchange tubes are provided with a heat dissipation fin array, and the heat exchange tubes are arranged in an equilateral triangle arrangement.

5. A dry refrigerant evaporator according to claim 4, characterized in that: The fin array spacing of the heat dissipation fin array is 15-24 mm.

6. A dry refrigerant evaporator according to claim 4 or 5, characterized in that: The heat dissipation fins of the heat dissipation fin array are coated aluminum foils with a hydrophilic angle of 20°≤θ≤30°.

7. A dry refrigerant evaporator according to claim 6, characterized in that: The coated aluminum foil substrate has a thickness of 0.1-0.2 mm and is coated with an organic resin lubricating layer.

8. A dry refrigerant evaporator according to any one of claims 1 to 4, characterized in that: Each of the baffle plates is an arcuate baffle plate with a liquid-passing hole, the hole gaps are arranged up and down, and the baffle spacing is 120-200 mm.

9. The dry refrigerant evaporator according to claim 8, characterized in that: An elastic sealing member is disposed at the contact portion between the arcuate baffle and the shell.

10. A dry refrigerant evaporator according to any one of claims 1 to 5, characterized in that: The hard pull rods are located on four side surfaces of the evaporator core except two end surfaces.

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