Falling film evaporator and refrigeration apparatus
By setting multiple baffles and bending structures in the falling film evaporator, the liquid droplets in the high-speed airflow are intercepted and separated multiple times, which solves the liquid hammer problem caused by the high-speed airflow carrying liquid droplets and improves the system stability and energy efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NANJING TICA AIR CONDITIONING CO LTD
- Filing Date
- 2026-04-23
- Publication Date
- 2026-07-14
Smart Images
Figure CN122384331A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of refrigeration equipment technology, and more specifically, to a falling film evaporator and refrigeration equipment. Background Technology
[0002] While falling film evaporators are key components of high-temperature heat pump systems due to their high heat transfer coefficient and low refrigerant charge, in practical applications, if the rising high-speed refrigerant gas carries a large number of liquid droplets into the compressor, it can cause liquid slugging, reduced efficiency, and even equipment damage. Related technologies often employ baffles or demisters to reduce liquid carryover in falling film evaporators, such as labyrinth baffles, perforated plates, or multi-layer stainless steel wire mesh structures in the airflow channel. However, labyrinth baffles or perforated plate structures offer unobstructed airflow channels with minimal gas flow direction changes and short separation paths, making it difficult to effectively intercept tiny droplets. If the baffle openings or arrangement are improper, gas bypass or secondary droplet entrainment can occur, resulting in very limited separation effectiveness. While multi-layer stainless steel wire mesh offers better separation, its complex structure, high cost, and significant pressure drop can actually reduce system energy efficiency. Summary of the Invention
[0003] This application provides a falling film evaporator and a refrigeration device to solve at least one of the above-mentioned technical problems.
[0004] The falling film evaporator according to the embodiments of this application includes: The housing has a cooling chamber inside, and an air inlet and an exhaust outlet are provided on the top of the housing. The air inlet and the exhaust outlet are connected to the cooling chamber, and a cooling flow channel is formed between the air inlet and the exhaust outlet. A falling film tube bundle is disposed in the middle of the cooling chamber; A full liquid tube bundle, wherein the falling film tube bundle is disposed at the bottom of the cooling chamber; A liquid distributor is disposed in the cooling chamber, and the liquid distributor is connected to the air inlet and located above the falling film tube bundle; A baffle assembly, comprising multiple baffles, wherein the multiple baffles are sequentially and spaced apart within the cooling channel along the refrigerant flow direction.
[0005] The falling film evaporator provided in this application, by sequentially setting multiple baffles along the refrigerant flow direction in the cooling channel, facilitates multiple interceptions and separations of liquid droplets entrained in the high-speed airflow. While ensuring smooth airflow, it significantly improves the liquid removal efficiency, thereby effectively preventing liquid slugging in the compressor, ensuring stable system operation, and improving overall energy efficiency.
[0006] In some embodiments, the plurality of liquid baffles include two first liquid baffles, the first liquid baffles being fixed on the outer wall of the liquid distributor, and the two first liquid baffles being respectively disposed on both sides of the liquid distributor.
[0007] In this way, by directly fixing the first baffle plate to the outer wall of the liquid distributor and setting it on both sides, the space around the liquid distributor is fully utilized, and the entrained droplets are initially intercepted after the airflow passes through the falling film tube bundle area.
[0008] In some embodiments, the first baffle plate includes a fixing part and a blocking part. The fixing part is fixed to the outer wall of the liquid distributor, and one end of the blocking part is connected to the fixing part, while the other end is inclined toward the bottom of the housing.
[0009] In this way, by setting up a bottom-sloping baffle, the intercepted droplets can flow smoothly back to the full liquid tube bundle area below by gravity along the inclined surface, avoiding the droplets from accumulating on the baffle plate and being carried away by the airflow again, which helps to improve the separation efficiency and realize the rapid recovery of condensate.
[0010] In some embodiments, the plurality of liquid baffles include two second liquid baffles fixed to the inner side of the housing, the two second liquid baffles being respectively disposed on both sides of the liquid distributor, and the second liquid baffles being at least partially located above the first liquid baffle.
[0011] Thus, by setting the second baffle above the first baffle and fixing it to the housing, a three-dimensional interception layout is formed in the vertical space with the first baffle, which can capture the tiny droplets escaping in the rising airflow for a second time, significantly extending the gas-liquid separation path and helping to further improve the overall liquid removal effect.
[0012] In some embodiments, the second baffle includes a downwardly bent structure located at the center of the second baffle.
[0013] Thus, by setting a downward bending structure in the middle of the second baffle, the airflow is forced to change direction multiple times as it passes through, and the separation is enhanced by the inertial collision effect between the droplets and the baffle wall. At the same time, the residence time of the airflow in the baffle area is extended, which is conducive to achieving higher precision gas-liquid separation in a limited space.
[0014] In some embodiments, the second baffle plate has a liquid outlet hole located at the bottom of the bent structure.
[0015] Thus, by opening a liquid outlet at the bottom of the bending structure, the condensate intercepted and collected by the bending structure can be discharged in time, preventing the liquid film from thickening on the baffle surface or even being torn apart by the high-speed airflow to form droplets again. This helps maintain the continuous separation capability of the second baffle plate and avoids secondary entrainment.
[0016] In some embodiments, the falling film evaporator further includes an air inlet pipe, the air inlet being connected to the liquid distributor through the air inlet pipe, and the plurality of liquid baffles including a third liquid baffle, the third liquid baffle being arranged around the air inlet pipe and fixed inside the housing.
[0017] Thus, by setting the third baffle plate around the intake pipe and fixing it inside the housing, the tiny droplets that remain after being separated by the preceding baffle plate are intercepted, which helps to ensure that the gas entering the exhaust port reaches a higher degree of dryness and further avoids the risk of compressor liquid slugging.
[0018] In some embodiments, the falling film evaporator further includes two liquid-blocking plates, which are respectively fixed at both ends of the third liquid-blocking plate. The air inlet pipe, the third liquid-blocking plate, and the two liquid-blocking plates enclose an exhaust chamber, which is connected to the exhaust port. An exhaust hole is provided on the third liquid-blocking plate, and the exhaust chamber is connected to the cooling chamber through the exhaust hole.
[0019] In this way, the third baffle plate, the baffle plate and the air inlet pipe form an independent exhaust chamber, so that the cooled gas must pass through the throttling and separation of the exhaust hole before it can be discharged, thus achieving further drying of the discharged gas.
[0020] In some embodiments, there are multiple vent holes, which are spaced apart on the third baffle plate, and the diameter of the multiple vent holes gradually decreases along the direction close to the vent.
[0021] In this way, by setting the diameter of multiple exhaust holes to gradually decrease along the direction close to the exhaust port, the flow velocity distribution of the airflow is more uniform during the process of entering the exhaust chamber, avoiding secondary entrainment of droplets caused by excessive local flow velocity. At the same time, multi-stage throttling and interception of residual tiny droplets are performed, which is conducive to achieving smooth airflow discharge and achieving the best liquid removal and drying effect.
[0022] Another embodiment of the refrigeration device of this application includes the falling film evaporator described in any of the above claims.
[0023] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the falling film evaporator according to an embodiment of this application; Figure 2 This is a schematic diagram of the falling film evaporator according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the second baffle plate according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the third baffle plate according to an embodiment of this application; Figure 5 This is a schematic diagram of the liquid-blocking plate according to an embodiment of this application.
[0025] Explanation of reference numerals in the attached drawings: Falling film evaporator 100, shell 10, cooling chamber 11, air inlet 12, exhaust port 13, falling film tube bundle 20, full liquid tube bundle 30, liquid distributor 40, baffle plate assembly 50, baffle plate 51, first baffle plate 52, fixing part 521, blocking part 522, second baffle plate 53, bending structure 531, liquid outlet hole 532, third baffle plate 54, exhaust hole 541, air inlet pipe 60, liquid blocking plate 70, exhaust chamber 80. Detailed Implementation
[0026] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and 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 this application. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.
[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0029] This disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described herein. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.
[0030] Please see Figure 1 This application provides a refrigeration device, including a falling film evaporator 100. The falling film evaporator 100 includes a shell 10, a falling film tube bundle 20, a liquid-filled tube bundle 30, a liquid distributor 40, and a baffle plate assembly 50. A cooling chamber 11 is formed inside the shell 10. An air inlet 12 and an exhaust outlet 13 are provided at the top of the shell 10. The air inlet 12 and the exhaust outlet 13 are connected to the cooling chamber 11, and a cooling flow channel is formed between the air inlet 12 and the exhaust outlet 13. The falling film tube bundle 20 is disposed in the middle of the cooling chamber 11. The falling film tube bundle 20 is disposed at the bottom of the cooling chamber 11. The liquid distributor 40 is disposed inside the cooling chamber 11, and the liquid distributor 40 is connected to the air inlet 12 and located above the falling film tube bundle 20. The baffle plate assembly 50 includes a plurality of baffle plates 51, which are arranged sequentially and at intervals in the cooling flow channel along the refrigerant flow direction.
[0031] The falling film evaporator 100 provided in this application, by sequentially arranging multiple baffles 51 along the refrigerant flow direction in the cooling channel, facilitates multiple interceptions and separations of liquid droplets entrained in the high-speed airflow. While ensuring smooth airflow, it significantly improves the liquid removal efficiency, thereby effectively preventing liquid slugging in the compressor, ensuring stable system operation, and improving overall energy efficiency.
[0032] Specifically, this application provides a refrigeration device, which can be a household air conditioner, a commercial central air conditioner, a cold chain refrigeration system, a high-temperature heat pump, or other similar devices. In this embodiment, the refrigeration device is described using a high-temperature heat pump as an example.
[0033] In this embodiment, the refrigeration equipment includes a falling film evaporator 100, which is a device in the refrigeration system for realizing gas-liquid heat exchange. The falling film evaporator 100 adopts a sealed structure as a whole, including a shell 10, a falling film tube bundle 20, a full liquid tube bundle 30, a liquid distributor 40, and a baffle plate assembly 50. The components work together to achieve efficient cooling of the refrigerant and gas-liquid separation.
[0034] In this embodiment, the housing 10 has a cylindrical structure. The wall thickness of the housing 10 is selected according to the working pressure of the refrigeration equipment to ensure that the housing 10 can withstand the pressure of the internal refrigerant and avoid leakage. A sealed cooling chamber 11 is formed inside the housing 10. The cooling chamber 11 is used for heat exchange and gas-liquid separation of the refrigerant. The volume of the cooling chamber 11 is selected according to the cooling capacity requirement to ensure that the refrigerant has sufficient residence time to complete heat exchange.
[0035] Furthermore, the top of the housing 10 is provided with an air inlet 12 and an exhaust outlet 13. Both the air inlet 12 and the exhaust outlet 13 penetrate the top wall of the housing 10 and are in communication with the cooling chamber 11. The air inlet 12 is used to introduce the high-temperature refrigerant gas to be cooled into the cooling chamber 11, and the exhaust outlet 13 is used to discharge the cooled and dry refrigerant gas into subsequent components such as the compressor.
[0036] In this embodiment, the exhaust port 13 is symmetrically distributed on both sides of the air inlet 12 and forms a continuous cooling channel. After the refrigerant gas enters the cooling chamber 11 from the air inlet 12, it passes through each component in sequence along the cooling channel, and after completing heat exchange and droplet separation, it is discharged from the exhaust port 13.
[0037] In this embodiment, both the falling film tube bundle 20 and the filled liquid tube bundle 30 are composed of multiple heat transfer tubes. The heat transfer tubes can be made of high-efficiency heat transfer metal materials, and the cooling medium flows inside the tubes, achieving heat exchange with the refrigerant through heat conduction. The falling film tube bundle 20 is located in the middle of the cooling chamber 11, and its arrangement is staggered to ensure that the refrigerant gas can flow evenly over the surface of the tube bundle, thereby improving the heat exchange efficiency. The filled liquid tube bundle 30 is located at the bottom of the cooling chamber 11, below the falling film tube bundle 20. Its structure is adapted to the falling film tube bundle 20 to receive the condensate dripping from the falling film tube bundle 20 and further cool the refrigerant.
[0038] In this embodiment, the liquid distributor 40 is disposed in the cooling chamber 11 and fixed to the top inner wall of the housing 10. The liquid distributor 40 is connected to the air inlet 12 and located above the falling film tube bundle 20. The liquid distributor 40 is used to evenly distribute the refrigerant gas introduced from the air inlet 12 and at the same time evenly spray the condensate on the surface of the falling film tube bundle 20 to achieve falling film evaporation heat exchange.
[0039] In this embodiment of the application, the baffle plate assembly 50 includes a plurality of baffle plates 51. The plurality of baffle plates 51 are arranged sequentially and at intervals in the cooling channel along the refrigerant flow direction. The baffle plates 51 are usually made of corrosion-resistant and smooth metal material. Their structural design is adapted to the size of the cooling channel to ensure that the airflow is not affected while achieving efficient interception of liquid droplets.
[0040] Please see Figure 2 In some embodiments, the plurality of baffles 51 include two first baffles 52, which are fixed on the outer wall of the distributor 40 and are respectively disposed on both sides of the distributor 40.
[0041] In this way, by directly fixing the first baffle plate 52 to the outer wall of the liquid distributor 40 and setting it on both sides, the space around the liquid distributor 40 is fully utilized, and the entrained droplets are initially intercepted after the airflow passes through the area of the falling film tube bundle 20.
[0042] Specifically, in this embodiment, the multiple baffles 51 include two first baffles 52. The first baffles 52 can be made of the same metal material as the housing 10 and the distributor 40. Their size is reasonably designed according to the shape of the distributor 40 and the width of the cooling channel to ensure that they can effectively cover the key area of airflow, while not affecting the normal operation of the distributor 40 and the smooth flow of the refrigerant.
[0043] In some embodiments, the first baffle plate 52 is fixed to the outer wall of the distributor 40 by welding or bolting. When welding, the weld is uniform and continuous to ensure the firmness and sealing of the connection and prevent refrigerant gas from leaking from the connection gap. When bolting, the outer wall of the distributor 40 has a pre-set threaded hole, and the first baffle plate 52 has a corresponding through hole. The two are fixed by high-strength bolts, which facilitates subsequent maintenance and replacement.
[0044] In this embodiment, two first baffle plates 52 are respectively disposed on both sides of the liquid distributor 40 and are symmetrically distributed along the axis of the liquid distributor 40 to ensure that the liquid droplets carried in the airflow flowing from both sides of the liquid distributor 40 can be completely intercepted.
[0045] In this embodiment, the first baffle plate 52 extends to both sides of the falling film tube bundle 20, maintaining a certain distance from the falling film tube bundle 20 to avoid collision with the falling film tube bundle 20, while ensuring that the airflow carrying droplets generated by evaporation from the surface of the falling film tube bundle 20 can be intercepted.
[0046] Please see Figure 2 In some embodiments, the first baffle plate 52 includes a fixing part 521 and a blocking part 522. The fixing part 521 is fixed on the outer wall of the liquid distributor 40, and one end of the blocking part 522 is connected to the fixing part 521, while the other end is inclined toward the bottom of the housing 10.
[0047] Thus, by setting up a bottom-sloping blocking part 522, the intercepted droplets can flow smoothly back to the full liquid tube bundle 30 area below by gravity along the inclined surface, avoiding the droplets from accumulating on the first liquid baffle 52 and being carried away by the airflow again, which is beneficial to improving the separation efficiency and realizing the rapid recovery of condensate.
[0048] Specifically, in this embodiment, the first baffle plate 52 includes a fixing part 521 and a blocking part 522, which are made by integral stamping or machining to ensure the integrity and strength of the structure. The fixing part 521 is a vertically arranged flat plate, the shape of which is adapted to the outer wall of the liquid distributor 40, and the fixing part 521 is fixed to the outer wall of the liquid distributor 40.
[0049] In this embodiment, one end of the blocking part 522 is connected to the fixing part 521, and the connection is rounded to avoid stress concentration and extend the service life of the first liquid baffle 52. The other end of the blocking part 522 is inclined towards the bottom of the housing 10, and the inclination direction is adapted to the flow direction of the refrigerant airflow, so as not to affect the smooth passage of the airflow, and to effectively intercept the liquid droplets in the airflow.
[0050] In some embodiments, the tilt angle of the blocking part 522 should ensure that the intercepted droplets can flow back smoothly along the tilted surface by their own gravity. The tilt angle should take into account both the interception effect and the return efficiency, and avoid the angle being too large, which would increase the airflow resistance, or the angle being too small, which would prevent the droplets from flowing back smoothly.
[0051] In some embodiments, the width of the blocking part 522 is the same as the width of the fixing part 521, and the bottom of the blocking part 522 extends to both sides of the falling film tube bundle 20 and is located above the area of the full liquid tube bundle 30, so that the backflowing droplets can accurately fall into the area of the full liquid tube bundle 30 below, thereby realizing the recovery of condensate.
[0052] In this embodiment, the blocking part 522 is located below the fixing part 521, inclined towards the bottom of the housing 10, and forms a certain angle with the axis of the liquid distributor 40. The blocking parts 522 of the two first liquid baffles 52 are symmetrically inclined and together form a downward converging interception area to ensure that the airflow flowing from both sides can be effectively intercepted.
[0053] Please see Figure 2 In some embodiments, the plurality of liquid baffles 51 include two second liquid baffles 53, which are fixed to the inner side of the housing 10. The two second liquid baffles 53 are respectively disposed on both sides of the liquid distributor 40, and the second liquid baffles 53 are at least partially located above the first liquid baffle 52.
[0054] Thus, by setting the second baffle plate 53 above the first baffle plate 52 and fixing it to the housing 10, a three-dimensional interception layout is formed with the first baffle plate 52 in the vertical space, which can capture the tiny droplets escaping in the rising airflow for a second time, significantly extending the gas-liquid separation path and helping to further improve the overall liquid removal effect.
[0055] In this embodiment, the multiple liquid baffles 51 include two second liquid baffles 53. The second liquid baffles 53 are fixed to the inner wall of the housing 10. In some embodiments, the fixing method is welding or bolt connection. When welding, the edge of the second liquid baffle 53 is tightly fitted with the inner wall of the housing 10, and the weld is continuous and uniform to ensure a firm and sealed connection. When bolt connection is used, a mounting seat is preset on the inner wall of the housing 10, and a threaded hole is opened on the mounting seat. A corresponding through hole is opened on the second liquid baffle 53. The second liquid baffle 53 is fixed to the mounting seat by bolts, which facilitates subsequent maintenance and replacement.
[0056] In this embodiment, the second baffle plate 53 is located in the middle section of the cooling channel, above the first baffle plate 52. After the airflow is initially intercepted by the first baffle plate 52, it carries the remaining tiny droplets upward and enters the interception area of the second baffle plate 53, achieving secondary separation and significantly improving the liquid removal efficiency.
[0057] In this embodiment, two second baffle plates 53 are respectively disposed on both sides of the distributor 40 and are symmetrically distributed to ensure that the airflow can flow evenly over the second baffle plates 53 on both sides, achieving symmetrical interception and avoiding uneven liquid removal effect caused by airflow deviation. The second baffle plates 53 are at least partially located above the first baffle plate 52, forming a staggered layout with the first baffle plate 52 in vertical space. This three-dimensional interception layout can make full use of the vertical space of the cooling chamber 11 and extend the gas-liquid separation path.
[0058] In some embodiments, a certain gap is left between the second baffle plate 53 and the first baffle plate 52. This gap is selected according to the airflow speed to ensure that the airflow after being initially intercepted by the first baffle plate 52 can flow smoothly to the second baffle plate 53, while avoiding the formation of eddies between the two baffle plates, which would cause secondary entrainment of droplets.
[0059] Please see Figure 2 and Figure 3 In some embodiments, the second baffle plate 53 includes a downwardly bent structure 531 located in the middle of the second baffle plate 53.
[0060] Thus, by setting a downward bending structure in the middle of the second baffle 53, the airflow is forced to change its direction multiple times as it passes through, and the separation is enhanced by the inertial collision effect between the droplets and the baffle wall. At the same time, the residence time of the airflow in the baffle area is extended, which is conducive to achieving higher precision gas-liquid separation in a limited space.
[0061] In this embodiment, the second liquid baffle 53 includes a downwardly bent structure 531. Specifically, the bent structure 531 is located in the middle of the second liquid baffle 53 and is integrally formed with the second liquid baffle 53. It is manufactured using a stamping process to ensure the integrity and strength of the structure. The bend is rounded to avoid stress concentration and facilitate the convergence and sliding of liquid droplets. The bending angle of the bent structure 531 should ensure that it can effectively change the airflow direction without generating excessive airflow resistance, ensuring that the energy efficiency of the refrigeration system is not affected.
[0062] In this embodiment, the bending structure 531 bends towards the bottom of the housing 10 to form a downwardly recessed area. This area can effectively collect the intercepted droplets and force the airflow to change direction multiple times as it passes through, increasing the chance of the airflow contacting the wall of the second baffle plate 53.
[0063] In some embodiments, the overall length of the second baffle 53 is selected based on the distance between the inner side of the housing 10 and the side of the distributor 40, and the length of the bending structure 531 is approximately 1 / 2 of the total length of the second baffle 53, ensuring that the main flow area of the airflow can be covered to achieve comprehensive interception.
[0064] In this embodiment, the bending structure 531 is located in the middle of the second baffle plate 53 and is located on one side of the first baffle plate 52 in the vertical direction, ensuring that the tiny droplets that escape through the first baffle plate 52 can flow to the interception area of the bending structure 531, thereby achieving efficient capture.
[0065] Please see Figure 2 In some embodiments, the bending structure 531 is V-shaped, concave, or U-shaped.
[0066] Thus, by setting the bending structure 531 to a V-shape, a concave shape, or a U-shape, the optimal bending form can be selected according to different airflow velocities and droplet distribution characteristics. This ensures effective disturbance of the airflow while also taking into account the ease of processing the structure, which is conducive to achieving a balance between separation efficiency and manufacturing cost.
[0067] In some embodiments, the bending structure 531 is V-shaped, concave, or U-shaped. All three bending forms can be integrally formed by stamping, with simple structure and convenient processing. They can be flexibly selected according to different application scenarios and usage requirements, taking into account both separation efficiency and manufacturing cost.
[0068] Specifically, in this embodiment, the bending structure 531 is V-shaped, consisting of two inclined plates with an included angle of 60°. The ends of the two plates are smoothly connected to the main body of the second baffle plate 53, and the bend is rounded to avoid stress concentration and droplet accumulation. The concave bending structure 531 is an arc-shaped concave shape, and the curvature is designed according to the airflow speed to better guide the airflow direction and facilitate the convergence and sliding of droplets. Furthermore, the V-shaped bending structure 531 has the simplest processing technology and the lowest manufacturing cost.
[0069] In some embodiments, the V-shaped bending structure 531 is suitable for scenarios with high airflow speed, and can enhance airflow disturbance and improve inertial collision effect through sharp bends; the concave bending structure 531 is suitable for scenarios with small droplet size, and the arc-shaped surface can better capture tiny droplets; the U-shaped bending structure 531 is suitable for scenarios with a large droplet content, and the bottom surface can collect more droplets, making it easier to discharge.
[0070] In some embodiments, if further improvement in separation efficiency is required, the bending structure 531 can be designed as a composite type, such as a combination of V-shape and concave shape, taking into account the advantages of both structures.
[0071] Please see Figure 2 and Figure 3 In some embodiments, the second baffle plate 53 is provided with a liquid outlet hole 532, which is located at the bottom of the bending structure 531.
[0072] Thus, by opening a liquid outlet hole 532 at the bottom of the bending structure 531, the condensate intercepted and collected by the bending structure 531 can be discharged in time, preventing the liquid film from thickening on the baffle surface or even being torn apart by the high-speed airflow to form droplets again. This helps to maintain the continuous separation capability of the second baffle plate 53 and avoid secondary entrainment.
[0073] In this embodiment, the second baffle plate 53 is provided with a liquid outlet hole 532. The liquid outlet hole 532 is located at the bottom of the bent structure 531 and is connected to the inner wall of the bent structure 531. There are multiple liquid outlet holes 532, which are evenly spaced along the bending line of the bent structure 531 at the bottom of the bent structure 531 to ensure that the condensate above the second baffle plate 53 can be discharged evenly and in a timely manner.
[0074] In some embodiments, the liquid outlet 532 is circular or elliptical in shape, and the diameter of the outlet is designed according to the flow rate of the liquid droplets to ensure that the liquid droplets can pass through smoothly, while preventing the airflow from passing through the liquid outlet 532 and causing secondary entrainment of the liquid droplets.
[0075] In some embodiments, the bottom of the bending structure 531 is inclined, and the liquid outlet 532 is located at the lowest point of the inclined surface, ensuring that all the condensate collected in the bending structure 531 can flow to the liquid outlet 532, and preventing droplets from accumulating in the bending structure 531.
[0076] Please see Figure 2 and Figure 4 In some embodiments, the falling film evaporator 100 further includes an air inlet pipe 60, the air inlet 12 is connected to the liquid distributor 40 through the air inlet pipe 60, and the plurality of liquid baffles 51 include a third liquid baffle 54, which is arranged around the air inlet pipe 60 and fixed inside the housing 10.
[0077] Thus, by setting the third baffle plate 54 around the intake pipe 60 and fixing it inside the housing 10, the tiny droplets that remain after being separated by the preceding third baffle plate 54 are intercepted, which helps to ensure that the gas entering the exhaust port 13 reaches a higher degree of dryness and further avoids the risk of compressor liquid slugging.
[0078] Specifically, in this embodiment, the falling film evaporator 100 further includes an inlet pipe 60. The diameter of the inlet pipe 60 is selected according to the refrigerant flow rate to ensure that the refrigerant gas can pass smoothly. One end of the inlet pipe 60 is sealed to the inlet port 12 at the top of the shell 10. Optionally, the connection method is welding or flange connection. When welding, ensure that the weld is sealed to avoid refrigerant leakage. When flange connection is used, the flange is tightened with bolts and a sealing gasket is set between the flange faces to further improve the sealing performance.
[0079] In this embodiment, the other end of the intake pipe 60 extends into the cooling chamber 11 and communicates with the liquid distributor 40. The connection between the intake pipe 60 and the liquid distributor 40 adopts a sealed structure to ensure that all the refrigerant gas can enter the liquid distributor 40 and will not leak into other areas of the cooling chamber 11.
[0080] In this embodiment of the application, the plurality of liquid baffles 51 include a third liquid baffle 54, which is fixed on the inner side wall of the housing 10. The third liquid baffle 54 is provided with a through hole, the inner diameter of which is adapted to the outer diameter of the air inlet pipe 60, so that it can fit tightly against the outer wall of the air inlet pipe 60, and at the same time, the third liquid baffle 54 is arranged around the air inlet pipe 60.
[0081] In some embodiments, the third baffle plate 54 is fixed to the air intake pipe 60 by welding. The inner ring of the third baffle plate 54 is welded to the outer wall of the air intake pipe 60, and the outer ring is welded to the inner side wall of the housing 10 to ensure a firm connection and form a sealing structure to prevent airflow from escaping from the gap between the third baffle plate 54, the air intake pipe 60, and the housing 10.
[0082] In this embodiment, the third baffle plate 54 is located at the end of the cooling channel, adjacent to the exhaust port 13, and above the second baffle plate 53. The intake pipe 60 passes through the center of the third baffle plate 54, forming a surrounding interception structure. The tiny droplets that remain after being separated by the first and second baffle plates 53 flow upward with the airflow and enter the interception area of the third baffle plate 54, where they are intercepted, achieving a third separation.
[0083] Please see Figure 2 , Figure 4 and Figure 5 In some embodiments, the falling film evaporator 100 further includes two liquid-blocking plates 70, which are respectively fixed at both ends of the third liquid-blocking plate 54. The air inlet pipe 60, the third liquid-blocking plate 54, and the two liquid-blocking plates 70 form an exhaust chamber 80, which is connected to the exhaust port 13. An exhaust hole 541 is provided on the third liquid-blocking plate 54, and the exhaust chamber 80 is connected to the cooling chamber 11 through the exhaust hole 541.
[0084] Thus, the independent exhaust chamber 80 is formed by the third liquid baffle 54, the liquid baffle 70 and the air inlet pipe 60, so that the cooled gas must pass through the throttling and separation of the exhaust port 541 before it can be discharged, thereby achieving further drying of the discharged gas.
[0085] In this embodiment, the falling film evaporator 100 further includes two liquid-blocking plates 70. The liquid-blocking plates 70 are flat and their dimensions are adapted to the width of the third liquid-blocking plate 54 and the height of the third liquid-blocking plate 54 from the housing 10, which can effectively seal the gap between the two ends of the third liquid-blocking plate 54 and the housing 10.
[0086] Specifically, two liquid-blocking plates 70 are fixed to both ends of the third liquid-blocking plate 54. The fixing method can be welding. One side of the liquid-blocking plate 70 is welded to the end of the third liquid-blocking plate 54, the other side is welded to the inner wall of the housing 10, and the bottom is welded to the top of the second liquid-blocking plate 53. The air inlet pipe 60, the third liquid-blocking plate 54, and the two liquid-blocking plates 70 form an exhaust chamber 80, which is located at the top of the cooling chamber 11 and communicates with the exhaust port 13 at the top of the housing 10. The exhaust port 13 penetrates the top wall of the exhaust chamber 80 to ensure that the refrigerant gas in the exhaust chamber 80 can be discharged smoothly.
[0087] Furthermore, the third baffle plate 54 is provided with an exhaust hole 541, which penetrates the thickness of the third baffle plate 54, so that the exhaust chamber 80 is connected to the cooling chamber 11 through the exhaust hole 541. The airflow after the previous separation must enter the exhaust chamber 80 through the exhaust hole 541 and then be discharged from the exhaust port 13. In this way, the exhaust chamber 80 can buffer the airflow, reduce the airflow speed, and facilitate the separation of droplets.
[0088] In some embodiments, if the exhaust volume is large, the number of liquid-blocking plates 70 can be appropriately increased to divide the exhaust chamber 80 into multiple small chambers, thereby further improving the buffering and separation effect.
[0089] Please see Figure 2 and Figure 4 In some embodiments, there are multiple vent holes 541, which are spaced apart on the third baffle plate 54, and the diameter of the multiple vent holes 541 gradually decreases along the direction close to the vent port 13.
[0090] Thus, by setting the diameter of multiple exhaust holes 541 to gradually decrease along the direction close to the exhaust port 13, the flow velocity distribution of the airflow is made more uniform during the process of entering the exhaust chamber 80, avoiding secondary entrainment of droplets caused by excessive local flow velocity. At the same time, multi-stage throttling and interception of residual tiny droplets are performed, which is conducive to achieving stable discharge of airflow and achieving the best liquid removal and drying effect.
[0091] Specifically, in this embodiment, the distribution density of the multiple exhaust holes 541 is adapted to the airflow velocity. The diameter of the exhaust holes 541 is 15~100mm, and the diameter of the multiple exhaust holes 541 gradually decreases along the direction close to the exhaust port 13, which can make the flow velocity of the exhaust holes 541 closer to the exhaust port 13 slower. This avoids a large amount of gas flowing directly out of the exhaust port 13 through the exhaust holes 541 near the exhaust port 13, resulting in the airflow carrying a large amount of liquid.
[0092] Furthermore, in this embodiment, the third baffle plate 54 does not have an exhaust hole 541 at the position directly opposite the exhaust port 13.
[0093] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0094] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the stated features. In the description of this application, "multiple" means at least two, such as two or three, unless otherwise explicitly specified.
[0095] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.
Claims
1. A falling film evaporator, characterized in that, include: The housing has a cooling chamber inside, and an air inlet and an exhaust outlet are provided on the top of the housing. The air inlet and the exhaust outlet are connected to the cooling chamber, and a cooling flow channel is formed between the air inlet and the exhaust outlet. A falling film tube bundle is disposed in the middle of the cooling chamber; A full liquid tube bundle, wherein the falling film tube bundle is disposed at the bottom of the cooling chamber; A liquid distributor is disposed in the cooling chamber, and the liquid distributor is connected to the air inlet and located above the falling film tube bundle; A baffle assembly, comprising multiple baffles, wherein the multiple baffles are sequentially and spaced apart within the cooling channel along the refrigerant flow direction.
2. The falling film evaporator according to claim 1, characterized in that, The plurality of liquid baffles include two first liquid baffles, which are fixed on the outer wall of the liquid distributor and are respectively disposed on both sides of the liquid distributor.
3. The falling film evaporator according to claim 2, characterized in that, The first baffle plate includes a fixing part and a blocking part. The fixing part is fixed to the outer wall of the liquid distributor, and one end of the blocking part is connected to the fixing part, while the other end is inclined towards the bottom of the housing.
4. The falling film evaporator according to claim 2, characterized in that, The plurality of liquid baffles include two second liquid baffles, which are fixed to the inner side of the housing. The two second liquid baffles are respectively disposed on both sides of the liquid distributor, and the second liquid baffles are at least partially located above the first liquid baffle.
5. The falling film evaporator according to claim 4, characterized in that, The second baffle plate includes a downwardly bent structure located in the middle of the second baffle plate.
6. The falling film evaporator according to claim 5, characterized in that, The second baffle plate has a liquid outlet hole, which is located at the bottom of the bent structure.
7. The falling film evaporator according to claim 1, characterized in that, The falling film evaporator also includes an air inlet pipe, the air inlet being connected to the liquid distributor through the air inlet pipe, and the plurality of liquid baffles including a third liquid baffle, the third liquid baffle being arranged around the air inlet pipe and fixed inside the housing.
8. The falling film evaporator according to claim 7, characterized in that, The falling film evaporator also includes two liquid-blocking plates, which are respectively fixed at both ends of the third liquid-blocking plate. The air inlet pipe, the third liquid-blocking plate, and the two liquid-blocking plates form an exhaust chamber, which is connected to the exhaust port. An exhaust hole is provided on the third liquid-blocking plate, and the exhaust chamber is connected to the cooling chamber through the exhaust hole.
9. The falling film evaporator according to claim 8, characterized in that, The number of vent holes is multiple, and the multiple vent holes are spaced apart on the third baffle plate. The diameter of the multiple vent holes gradually decreases along the direction close to the vent.
10. A refrigeration device, characterized in that, Includes the falling film evaporator according to any one of claims 1-9.