Current collector and total heat exchanger

Abstract

The application discloses a current collector and a total heat exchanger, and relates to the technical field of air treatment equipment; the current collector comprises a current collector, and an air inlet of the current collector is arranged on the current collector and used for allowing air flow to pass through; a recessed part is arranged on the windward surface of the current collector, and the recessed part is located at the periphery of the air inlet of the current collector; one end of the length direction of the recessed part is arranged towards the air inlet of the current collector, and the other end of the length direction of the recessed part is arranged away from the air inlet of the current collector; the two sides of the width direction of the recessed part are arranged along the circumference of the current collector; and the width of the recessed part increases first and then decreases along the length direction of the recessed part towards the direction close to the air inlet of the current collector, so that the recessed part is in the shape of a wing. The current collector provided in the application is provided with the recessed part in the shape of a wing on the windward surface of the current collector, so that the air flow is guided to rotate in advance along the rotation direction of the centrifugal fan, and the energy dissipation of the air flow at the current collector is reduced.

Description

Technical Field

[0001] This application relates to the technical field of air handling equipment, and more particularly to a collector and a total heat exchanger. Background Technology

[0002] Centrifugal fans are an important component of total heat exchangers and are usually installed inside the volute. The main function of the volute is to guide and collect airflow. A collector is usually installed at the air inlet of the volute. The main function of the collector is to guide the intake airflow smoothly and orderly into the impeller guide channel, providing good initial conditions for the airflow to accelerate and rotate inside the impeller, thereby ensuring the efficient and stable operation of the fan.

[0003] The negative pressure generated by the impeller of the centrifugal fan causes the airflow outside the volute to pre-swirl along the fan's rotation direction before being drawn into the volute through the collector. This airflow rotation consumes the energy generated by the centrifugal fan's rotation. When the intake space of the collector is limited, the airflow must undergo a change of direction to enter the impeller guide channel, and this complex intake path can easily consume the energy of a better airflow.

[0004] In related technologies, the windward surface of the collector is usually a smooth curved surface. When the airflow path is simple and the intake space is sufficient, the smooth surface of the collector can effectively guide the airflow and reduce the energy dissipation of the airflow. However, in complex working conditions where space is severely limited and the airflow needs to turn multiple times, the smooth collector structure is difficult to effectively guide the airflow to form a pre-swirl in the same direction as the impeller rotation in advance, and cannot well meet the airflow organization requirements under complex intake conditions. Utility Model Content

[0005] To address the shortcomings of related technologies, this application provides a collector and a total heat exchanger. By providing a recess on the windward side of the collector, the airflow passes through the recess, which guides the airflow to rotate in advance along the rotation direction of the centrifugal fan, thereby reducing the energy dissipation of the airflow at the collector.

[0006] This application provides a collector with an air inlet for airflow to pass through; a recess is provided on the windward side of the collector, the recess is located on the outer periphery of the air inlet to guide the airflow to pre-swirl; the projection of the bottom surface of the recess defines a guide curve, one end of the guide curve in the length direction is set towards the air inlet of the collector, and the other end of the guide curve in the length direction is set away from the air inlet of the collector. Define the middle arc segment as an arc that passes through both ends of the guide curve along its length, with the convex direction of the middle arc segment opposite to the rotation direction of the airflow. The pilot curve includes: The first curve is located on one side of the convex middle arc segment. One end of the first curve is set towards the air inlet of the collector, and the other end of the first curve is set away from the air inlet of the collector. Along the direction away from the collector opening, the first curve first convexes towards the middle arc segment and then convexes away from the middle arc segment. The second curve is located on the other side of the middle arc section. One end of the second curve is set towards the air inlet of the collector, and the other end of the second curve is set away from the air inlet of the collector. The second curve protrudes towards the middle arc section. The distance between the first curve and the second curve first increases and then decreases towards the air inlet of the collector.

[0007] In the technical solution, a recessed part is set on the windward side of the collector and located on the outer periphery of the air inlet of the collector. The recessed part guides the airflow to pre-swirl, reducing the energy loss of the airflow before entering the impeller. This allows the airflow to enter the impeller guide channel more smoothly, thereby increasing the efficiency of the centrifugal fan, enhancing the overall work capacity, and increasing the air volume.

[0008] By increasing and then decreasing the distance between the first and second curves along the length of the guide curve towards the air inlet of the collector, the guide channel inside the recess increases and then decreases from the end away from the air inlet of the collector towards the end near the air inlet of the collector. When the airflow flows from the end away from the air inlet of the collector to the end near the air inlet of the collector in the recess, the airflow forms a stable pre-swirl, reducing the impact and turbulence when the airflow enters the volute, thereby reducing flow resistance, increasing intake efficiency, and reducing energy loss and noise caused by turbulence.

[0009] In some embodiments of this application, the first curve includes a first curve segment and a second curve segment. The first curve segment is located near the air inlet of the collector, and the second curve segment is connected to the end of the first curve segment away from the air inlet of the collector. The first curve segment protrudes in a direction away from the middle arc segment, and the second curve segment protrudes in a direction towards the middle arc segment. The curvature of the first curve segment is less than or equal to the curvature of the second curve segment.

[0010] In the technical solution, the first curved segment is positioned close to the air inlet of the collector and protrudes away from the middle arc segment. Its smaller curvature allows the airflow to flow smoothly when approaching the air inlet, avoiding the generation of local eddies due to excessive curvature. The second curved segment connects to the first curved segment and protrudes towards the middle arc segment. Its larger curvature can generate a stronger guiding force on the airflow away from the air inlet, guiding the airflow to deflect in the pre-swirl direction. This allows the airflow to gradually adjust its flow direction during the pre-swirl process, ensuring the stability of the airflow and accurately forming a suitable pre-swirl state, reducing the impact when the airflow enters the air inlet of the collector.

[0011] In some embodiments of this application, the radius R1 of the first curve segment and the radius R2 of the second curve segment satisfy: R1≥0.47R2, R1≤0.49R2; And / or, the radius R1 of the first curve segment, the radius R2 of the second curve segment, and the radius R0 of the middle arc segment satisfy: R1+R2≥0.433R0, R1+R2≤0.593R0.

[0012] In the technical solution, by defining the relationship between the radius R1 of the first curve segment and the radius R2 of the second curve segment, the radius R1 of the first curve segment is 47%-49% of the radius R2 of the second curve segment. The second curve segment with a smaller curvature can make the airflow turn smoothly to reduce turbulence, while the first curve segment with a larger curvature can enhance the expansion strength of the guide channel in the concave part. Furthermore, the difference in curvature between the two can form a smooth transition at the junction, avoiding the airflow stripping phenomenon caused by abrupt curvature changes, further optimizing the pre-swirl effect and increasing the intake stability.

[0013] By defining the relationship between the radius R1 of the first curve segment, the radius R2 of the second curve segment, and the radius R0 of the middle arc segment, the total curvature of the first and second curve segments is controlled, so that the guiding intensity of the side curve on the airflow is moderate. This avoids excessive curvature causing airflow impact, and also prevents insufficient pre-swirl due to insufficient curvature, allowing the airflow to obtain a reasonable tangential velocity and balancing the pre-swirl effect and flow resistance.

[0014] In some embodiments of this application, the second curve includes a third curve segment and a fourth curve segment. The third curve segment is located near the air inlet of the collector, and the fourth curve segment is connected to the end of the third curve segment away from the air inlet of the collector. The third curve segment and the fourth curve segment bulge towards the direction of the middle arc segment, respectively. The curvature of the third curve segment is less than that of the fourth curve segment.

[0015] In the technical solution, the third curve segment is made close to the air inlet of the collector and protrudes towards the middle arc segment. The smaller curvature can guide the airflow near the air inlet to flow smoothly in the pre-rotation direction. The fourth curve segment is connected to the third curve segment and protrudes towards the middle arc segment. The larger curvature can generate stronger traction on the airflow at the far end, so that the airflow at different positions can be smoothly adjusted according to the pre-rotation requirements, increasing the uniformity and stability of the pre-rotation.

[0016] In some embodiments of this application, the radius R3 of the third curve segment and the radius R4 of the fourth curve segment satisfy: R4≥1.2R3, R4≤1.3R3; And / or, the radius R2 of the second curve segment and the radius R3 of the third curve segment satisfy: R2≥0.03R3, R2≤0.1R3.

[0017] In the technical solution, by limiting the relationship between the radius R3 of the third curve segment and the radius R4 of the fourth curve segment, the radius R4 of the fourth curve segment is made to be 1.2-1.3 times the radius R3 of the third curve segment. This makes the curvature of the guide channel in the recess gradually flatten, reduces the friction loss between the centrifugal force of the airflow rotation and the wall of the recess, ensures that the pre-swirling airflow is smoothly introduced into the volute, and reduces energy dissipation.

[0018] By defining the relationship between the radius R2 of the second curve segment and the radius R3 of the third curve segment, the radius R2 of the second curve segment is 3%-10% of the radius R3 of the third curve segment. This makes the curvature of the second curve segment greater than that of the third curve segment. Thus, the sharp bend of the second curve segment forces the airflow to change direction and establish a pre-rotation angle. Then, the gentle bend of the third curve segment stabilizes the rotating flow state, effectively guiding the airflow to produce tangential deflection, enhancing the directionality of the airflow pre-rotation, making the airflow more closely follow the rotation direction of the volute, and reducing flow losses within the volute.

[0019] In some embodiments of this application, the guide curve further includes a third curve, which is connected to the end of the third curve segment facing the air inlet of the collector. The third curve and the third curve segment are located on the same side of the middle arc segment, and the third curve protrudes in a direction away from the middle arc segment.

[0020] In the technical solution, a third curve is set to connect to the end of the third curve segment facing the air inlet of the collector, and the third curve is made to bulge away from the middle arc segment. The third curve is used to fine-tune the airflow when it is about to enter the air inlet of the collector, so that the airflow is more accurately aligned with the center of the air inlet of the collector, reducing the eddy currents at the edge of the air inlet of the collector, optimizing the airflow distribution at the air inlet of the collector, increasing the intake efficiency, and reducing edge energy loss.

[0021] In some embodiments of this application, the radius R3 of the third curve segment, the radius R4 of the fourth curve segment, the radius R5 of the third curve, and the radius R0 of the middle arc segment satisfy: R3+R4+R5≥0.564R0, R3+R4+R5≤0.768R0.

[0022] In the technical solution, by limiting the relationship between the radius R3 of the third curve segment, the radius R4 of the fourth curve segment, the radius R5 of the third curve, and the radius R0 of the middle arc segment, the total curvature of the third curve segment, the fourth curve segment, and the third curve is controlled. This ensures that the guidance of airflow on this side curve is balanced with that on the other side, avoiding excessive airflow deflection or asymmetrical pre-swirl due to excessively large or small ratios, forming a symmetrical and stable pre-swirl flow field, and increasing the stability and reliability of the overall performance of the collector.

[0023] In some embodiments of this application, the radius R0 of the middle arc segment and the inner diameter D1 and outer diameter D2 of the collector satisfy the following relationship: R0≥0.792*(D1+D2), R0≤1.1*(D1+D2).

[0024] In the technical solution, by limiting the relationship between the radius R0 of the middle arc segment and the inner diameter D1 and outer diameter D2 of the collector, the shape of the recessed part is adapted to the overall size of the collector, ensuring that the length and curvature of the guide curve are appropriate, avoiding the increase in airflow travel due to the radius of the middle arc segment being too large or the insufficient guidance due to the radius being too small, optimizing the airflow path length, allowing the airflow to effectively complete pre-swirl in the recessed part, and reducing friction loss.

[0025] In some embodiments of this application, multiple recesses are provided, and the multiple recesses are arranged along the circumference of the collector; The number of recesses N and the inner diameter D1 and outer diameter D2 of the collector satisfy the following conditions: N≥0.05*(D1+D2), N≤0.08*(D1+D2).

[0026] In the technical solution, multiple recesses are set and arranged around the circumference of the collector to ensure the pre-swirl effect of the collector on the airflow. By limiting the relationship between the number of recesses N and the inner diameter D1 and outer diameter D2 of the collector, the number of recesses is adapted to the size of the collector, so that the recesses are evenly distributed around the circumference, forming a continuous and uniform pre-swirl flow field, increasing the overall intake efficiency and stability, and avoiding the problem of excessive number of recesses causing mutual interference of airflow between adjacent recesses, or insufficient number of recesses failing to cover the circumferential area of ​​the collector.

[0027] In addition, this application also provides a total heat exchanger, comprising: The casing contains fresh air ducts and exhaust air ducts. The heat exchange core is located inside the casing. The air in the fresh air duct and the air in the exhaust air duct exchange heat at the heat exchange core. The volute has an air inlet and an air outlet. The air inlet is connected to the air inlet of the housing, and the air outlet is connected to the air outlet of the housing. Centrifugal fan, the centrifugal fan is located inside the volute; The aforementioned collector is located at the air inlet of the volute; the collector is provided with an air inlet for airflow to pass through, and the air inlet of the collector constitutes the air inlet of the volute.

[0028] In the technical solution, a recess is provided on the windward side of the collector in the total heat exchanger, with one end of the recess facing the air inlet of the collector and the other end away from the air inlet. This creates a guide channel within the recess for airflow to enter the air inlet of the collector. By first increasing and then decreasing the width of the recess along the direction close to the air inlet of the collector, and then increasing and then decreasing the width of the guide channel along the direction of airflow, the airflow first diffuses within the recess, reducing velocity and increasing static pressure, and then contracts, accelerates, and aligns with the air inlet of the collector. Combined with the pre-swirl effect, this optimizes the state of airflow entering the volute, reduces fan energy consumption, increases the overall efficiency of the total heat exchanger, reduces airflow noise, and improves equipment operational stability.

[0029] In the above embodiments, a collector and a total heat exchanger are provided with a recessed portion on the windward side of the collector, so that the airflow flows into the air inlet of the collector through the recessed portion. The recessed portion guides the airflow to adjust its direction, so that the airflow rotates in advance along the rotation direction of the centrifugal fan, thereby reducing the energy dissipation of the airflow at the collector, enhancing the working capacity of the centrifugal fan, improving the intake noise, and increasing the air volume of the centrifugal fan. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of one embodiment of the current collector of this application, when it is assembled in a volute and when a centrifugal fan is assembled inside the volute. Figure 2 This is a schematic diagram of the current collector of this application when it is assembled in a volute; Figure 3 This is a schematic diagram of the structure of one embodiment of the current collector of this application; Figure 4 This is a schematic diagram of the current collector of this application from another angle; Figure 5 This is a schematic diagram of the guide curve in one embodiment of the current collector of this application; Figure 6 This is a schematic diagram of the component curves of the guide curve in one embodiment of the current collector of this application; Figure 7 This is a dimensioned diagram of the guide curve in one embodiment of the current collector of this application; Figure 8 This is a schematic diagram of the vortex distribution when a conventional collector is installed in a volute. Figure 9 This is a schematic diagram of the vortex distribution when the current collector of this application is installed in the volute casing according to one embodiment of the current collector; Figure 10 This is a schematic diagram of the structure of one embodiment of the total heat exchanger of this application; Figure 11 This is a schematic diagram of the internal structure of one embodiment of the total heat exchanger of this application.

[0031] In the diagram, 100 is the volute; 200 is the centrifugal fan; 300 is the collector; 400 is the casing; and 500 is the heat exchange core. 101. Volute air outlet; 102. Volute air inlet; 301. Air inlet of the collector; 310. Recess; 311. First curve; 312. Second curve; 313. Third curve; 314. Middle arc segment; 3111, First curve segment; 3112, Second curve segment; 3121, Third curve segment; 3122, Fourth curve segment; 401. Air inlet of the casing; 402. Air outlet of the casing. Detailed Implementation

[0032] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0033] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0034] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0035] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0036] Centrifugal fan 200 is typically installed inside volute 100. When airflow enters centrifugal fan 200 through volute inlet 102, it typically does not have rotational speed. However, the airflow needs to flow in the rotational direction of centrifugal fan 200 within the centrifugal fan 200. Therefore, at the instant or before the airflow enters centrifugal fan 200, it needs to dissipate some energy to impart a tangential velocity component consistent with the rotational direction of centrifugal fan 200, thereby enabling the airflow to flow in the rotational direction inside centrifugal fan 200.

[0037] In related technologies, a collector 300 is usually installed at the air inlet 102 of the volute to guide the airflow before it enters the centrifugal fan 200, so that the airflow has a certain rotation direction in advance, thereby reducing the energy dissipation when the airflow rotates with the centrifugal fan 200. However, the windward surface of the collector 300 is usually designed as a smooth curved surface, which has limited effect on the pre-rotation of the airflow and cannot well meet the needs of airflow pre-rotation.

[0038] Based on this, this application provides a collector 300, which provides a recessed portion 310 on the windward side of the collector 300 and adapts the shape of the recessed portion 310 to the rotation direction of the centrifugal fan 200, thereby forming a guide channel on the windward side of the collector 300. The guide channel guides the airflow to change direction, so that the airflow obtains a tangential velocity component consistent with the rotation direction of the centrifugal fan 200 before entering the centrifugal fan 200, thereby reducing the energy dissipation of the airflow at the collector 300, enhancing the work capacity of the centrifugal fan 200, improving the intake noise, and increasing the air volume of the centrifugal fan 200.

[0039] like Figures 1-4 This is a specific embodiment of the collector 300 of this application. The collector 300 is provided with a collector inlet 301, which is correspondingly arranged with the volute inlet 102. The airflow passes through the collector inlet 301 and enters the centrifugal fan 200 through the volute inlet 102.

[0040] It should be noted that when the collector 300 is installed on the volute 100, the collector air inlet 301 and the volute air inlet 102 are the same air inlet, and the collector air inlet 301 constitutes the volute air inlet 102.

[0041] like Figure 3 and Figure 4 As shown, the recessed portion 310 is provided on the windward surface of the collector 300 and is recessed inward. The recessed portion 310 is located on the outer periphery of the air inlet 301 of the collector. One end of the recessed portion 310 in the length direction is set towards the air inlet 301 of the collector, and the other end of the recessed portion 310 in the length direction is set away from the air inlet 301 of the collector.

[0042] By providing a recessed portion 310 on the windward surface of the collector 300, a guide channel is formed on the collector 300, and the guide channel is arranged approximately along the radial direction of the collector 300, thereby guiding the airflow passing through the collector 300 to the collector inlet 301.

[0043] When the airflow passes the windward side of the collector 300, at least part of the airflow flows into the air inlet 301 of the collector after being guided by the guide channel formed by the recess 310.

[0044] It should be noted that the guide channel is the space defined by the recess 310, and the shape of the guide channel is determined by the shape of the recess 310.

[0045] The shape of the recess 310 corresponds to the rotation direction of the centrifugal fan 200, so that the recess 310 can guide the airflow to pre-rotate, so that the rotation direction of the airflow in the recess 310 matches the rotation direction of the airflow in the centrifugal fan 200, thereby reducing the energy loss of the airflow entering the centrifugal fan 200, thereby increasing the efficiency of the centrifugal fan 200, enhancing the overall working capacity, and increasing the air volume.

[0046] For ease of description, the end of the recess 310 facing the air inlet 301 of the collector is called the air inlet end of the guide channel, and the end of the recess 310 away from the air inlet 301 of the collector is called the air outlet end of the guide channel.

[0047] The recessed portion 310 is arranged on both sides along the circumference of the collector 300 in the width direction, wherein the width of the recessed portion 310 is the width of the guide channel.

[0048] The width of the recess 310 increases first and then decreases along the direction close to the air inlet 301 of the collector. That is, the width of the guide channel increases first and then decreases along the direction of airflow. This reduces the energy loss of airflow in the recess 310 and makes the airflow into the centrifugal fan 200 more evenly distributed. It also avoids the decrease in air intake efficiency caused by local airflow turbulence, and increases air intake stability and overall flow efficiency while reducing wind resistance.

[0049] When the airflow first enters the guide channel, the increased width of the guide channel can reduce the airflow velocity and reduce turbulence at the inlet of the guide channel. At the same time, the expansion of space forms a buffer to avoid excessive resistance caused by sudden contraction of the airflow. As the airflow flows in the guide channel, the width of the guide channel gradually decreases to gradually increase the airflow velocity through spatial compression, reduce eddies and flow separation, enhance the directionality of the airflow, and make the airflow flow more concentrated towards the outlet.

[0050] like Figure 5 As shown, the recessed portion 310 defines a guide curve by the projected outline of its bottom surface. One end of the guide curve in the length direction is positioned towards the collector air inlet 301, and the other end of the guide curve in the length direction is positioned away from the collector air inlet 301. It should be noted that the guide curve is also the outline curve of the guide channel.

[0051] Define the middle arc segment 314, which passes through both ends of the guide curve length direction, and the convex direction of the middle arc segment 314 is opposite to the rotation direction of the centrifugal fan 200.

[0052] The radius R0 of the middle arc segment 314 satisfies the following relationship with the inner diameter D1 and outer diameter D2 of the collector 300: R0≥0.792*(D1+D2), R0≤1.1*(D1+D2). By limiting the relationship between the radius R0 of the middle arc segment 314 and the inner diameter D1 and outer diameter D2 of the collector 300, the shape of the recess 310 is adapted to the overall size of the collector 300, ensuring that the length and curvature of the guide curve are appropriate. This avoids the airflow travel being increased due to the radius of the middle arc segment 314 being too large or insufficient guidance due to the radius being too small, thus optimizing the airflow path length and allowing the airflow to effectively complete pre-swirl within the recess 310, reducing friction loss.

[0053] In some embodiments, the length L of the guide curve is 25 mm, that is, the length of the guide channel is 25 mm, and the length of the recess 310 is 25 mm.

[0054] In other embodiments, the maximum width W of the guide curve is 5.8 mm, that is, the maximum width of the guide channel is 5.8 mm, and the maximum width of the recess 310 is 5.8 mm.

[0055] like Figure 5 As shown, the guide curve includes a first curve 311, which is located on one side of the protrusion of the middle arc segment 314. One end of the first curve 311 is set towards the air inlet 301 of the collector, and the other end of the first curve 311 is set away from the air inlet 301 of the collector. In the direction close to the air inlet 301 of the collector, the first curve 311 first protrudes towards the middle arc segment 314 and then protrudes away from the middle arc segment 314.

[0056] The shape of the first curve 311 efficiently guides the airflow to complete the pre-swirling transition, reducing airflow disturbance. The first curve 311 initially bulges towards the middle arc section 314, initially converging the airflow away from the collector inlet 301 towards the middle arc section 314, preventing the airflow from dispersing and stagnating in the outer region. Subsequently, the first curve 311 bulges away from the middle arc section 314 to accommodate the accelerating trend of the airflow flowing towards the collector inlet 301, providing a buffer space for the airflow and preventing impact turbulence caused by sudden contraction. The first curve 311 gradually narrows the channel before the airflow approaches the collector inlet 301, guiding the airflow to contract smoothly, reducing flow resistance, and ensuring that the airflow enters the collector 300 in a more stable state.

[0057] like Figure 5 As shown, the guide curve includes a second curve 312, which is located on the other side of the middle arc segment 314. One end of the second curve 312 is set towards the collector air inlet 301, and the other end of the second curve 312 is set away from the collector air inlet 301. The second curve 312 protrudes towards the middle arc segment 314.

[0058] The second curve 312 forms a gradually converging flow channel to apply a centripetal guiding force to the airflow, causing the airflow to flow closely against the wall, effectively suppressing separation, and precisely controlling the airflow to stably develop the pre-swirl angle along a preset curved path opposite to the direction of rotation, ensuring that the airflow closely adheres to the side wall of the recess 310 and accurately shapes the pre-swirl trajectory.

[0059] By coordinating the first curve 311 and the second curve 312, and by the coordinated changes in the curve shape and the channel width, the airflow is able to form a suitable pre-swirling state before entering the collector inlet 301, which reduces the impact and turbulence when the airflow enters the volute 100, and makes the pressure gradient more uniform during the pre-swirling process, thereby increasing the smoothness of the airflow.

[0060] The distance between the first curve 311 and the second curve 312 first increases and then decreases towards the direction closer to the collector air inlet 301, so that the guide channel inside the recess 310 first increases and then decreases from the end away from the collector air inlet 301 to the end closer to the collector air inlet 301. When the airflow flows in the recess 310 from the end away from the collector air inlet 301 to the end closer to the collector air inlet 301, the airflow forms a stable pre-swirl, reducing the impact and turbulence when the airflow enters the volute 100, thereby reducing the flow resistance, increasing the intake efficiency, and reducing the energy loss and noise caused by turbulence.

[0061] like Figure 6 As shown, the first curve 311 includes a first curve segment 3111, which protrudes in a direction away from the middle arc segment 314; one end of the first curve segment 3111 is set towards the collector air inlet 301, and the other end of the first curve segment 3111 is set in a direction away from the collector air inlet 301.

[0062] like Figure 6 As shown, the first curve 311 includes a second curve segment 3112, which is connected to the end of the first curve segment 3111 away from the air inlet 301 of the collector, and the second curve segment 3112 protrudes toward the middle arc segment 314.

[0063] like Figure 6 As shown, the second curve 312 includes a third curve segment 3121. One end of the third curve segment 3121 is set towards the air inlet 301 of the collector, and the other end of the third curve segment 3121 is set away from the air inlet 301 of the collector; the third curve segment 3121 protrudes towards the middle arc segment 314.

[0064] like Figure 6As shown, the second curve 312 includes a fourth curve segment 3122, which is connected to the end of the third curve segment 3121 away from the air inlet 301 of the collector. The fourth curve segment 3122 protrudes in the direction of the middle arc segment 314.

[0065] It should be noted that the first curve segment 3111 and the third curve segment 3121 are located at the air outlet end of the guide channel, while the second curve segment 3112 and the fourth curve segment 3122 are located at the air inlet end of the guide channel.

[0066] The distance between the second curve segment 3112 and the fourth curve segment 3122 increases in the direction close to the air inlet 301 of the collector, so that the width of the recess 310 gradually increases at the air inlet end of the guide channel with the direction of airflow, thereby gradually widening the air inlet end of the guide channel, reducing pressure loss and turbulence caused by high-speed airflow, and reducing noise and vibration.

[0067] The distance between the first curve segment 3111 and the third curve segment 3121 decreases along the length of the guide curve toward the air inlet 301 of the collector, so that the width of the recess 310 gradually decreases at the air outlet of the guide channel along the direction of airflow, thereby increasing the airflow velocity, suppressing flow separation, reducing eddies and energy loss, and improving energy transfer efficiency.

[0068] By decreasing the distance between the first curve segment 3111 and the third curve segment 3121 along the length of the guide curve towards the collector inlet 301, and increasing the distance between the second curve segment 3112 and the fourth curve segment 3122 along the length of the guide curve towards the collector inlet 301, the width of the guide channel first increases and then decreases from the end away from the collector inlet 301 to the end near the collector inlet 301. When the airflow flows from the end away from the collector inlet 301 to the end near the collector inlet 301 within the recess 310, the airflow forms a stable pre-swirl, reducing the impact and turbulence when the airflow enters the volute 100, thereby reducing flow resistance, increasing intake efficiency, and reducing energy loss and noise caused by turbulence.

[0069] The first curved segment 3111 protrudes away from the middle arc segment 314, which reduces the distance between the first curved segment 3111 and the third curved segment 3121 along the direction closer to the air inlet 301 of the collector, forming a more reasonable contraction guide structure at the air outlet of the guide channel. It can also guide the airflow in a "converging" manner, enhance the directionality of the airflow towards the air inlet 301 of the collector, reduce the diffusion and eddies of the airflow at the edge of the air outlet of the guide channel, and suppress the flow separation phenomenon. It can also adapt to the pre-swirl state of the airflow after the initial guidance of the guide channel, making the flow trajectory of the airflow before entering the air inlet 301 of the collector smoother, avoiding the generation of local turbulence, thereby reducing the energy loss of the airflow at the air outlet of the guide channel, ensuring that the airflow flows into the centrifugal fan 200 in a more stable and concentrated state, and further increasing the air intake efficiency and the airflow energy transfer effect.

[0070] The third curve segment 3121 bulges towards the middle arc segment 314, so that the distance between the first curve segment 3111 and the third curve segment 3121 decreases along the direction close to the air inlet 301 of the collector. This ensures that the air outlet of the guide channel gradually contracts along the airflow direction to increase the airflow velocity, and also forms an "enveloping" guide for the airflow to adapt to the pre-swirling state of the airflow already formed in the guide channel, further constraining the airflow trajectory and preventing the airflow from excessively diffusing or leaving the guide channel at the edge of the air outlet, reducing eddies and energy loss caused by flow separation. At the same time, the bulge of the third curve segment 3121 towards the middle arc segment 314 can also make the airflow converge more evenly towards the air inlet 301 of the collector during the contraction process, avoiding turbulent disturbances caused by sudden changes in local airflow velocity, and finally allowing the airflow to enter the centrifugal fan 200 in a more stable and orderly state, reducing the intake resistance and increasing the intake efficiency.

[0071] The second curve segment 3112 and the fourth curve segment 3122 bulge towards the middle arc segment 314, forming a guiding profile at the inlet of the guide channel that adapts to the initial inflow state of the airflow. This creates a "wrapping" constraint on the airflow just entering the guide channel, preventing excessive diffusion of the airflow at the inlet edge. Combined with the design that the distance between the second curve segment 3112 and the fourth curve segment 3122 increases along the direction closer to the collector inlet 301, turbulence disturbance at the inlet of the guide channel can be reduced. At the same time, the increased width of the guide channel can reduce the airflow velocity and reduce the pressure loss caused by high-speed flow, laying the foundation for the airflow to form a stable pre-swirl within the guide channel. Ultimately, this reduces energy loss, noise, and vibration, and increases the airflow stability at the inlet end of the guide channel.

[0072] like Figure 7As shown, the radius R1 of the first curve segment 3111 and the radius R2 of the second curve segment 3112 satisfy: R1≥R2, so that the curvature of the first curve segment 3111 is greater than the curvature of the second curve segment 3112. The second curve segment 3112 with a smaller curvature can make the airflow turn smoothly to reduce turbulence, while the first curve segment 3111 with a larger curvature can enhance the expansion intensity of the guide channel.

[0073] In some embodiments, the radius R1 of the first curve segment 3111 and the radius R2 of the second curve segment 3112 satisfy: R1≥0.47R2, R1≤0.49R2, to limit the difference between the curvature of the first curve segment 3111 and the curvature of the second curve segment 3112, so that the difference in curvature between the two is within a reasonable range, ensuring that the two can form a smooth transition, avoiding airflow stripping caused by abrupt curvature changes, further optimizing the pre-swirl effect, and increasing intake stability.

[0074] The radius R1 of the first curve segment 3111, the radius R2 of the second curve segment 3112, and the radius R0 of the middle arc segment 314 satisfy the following conditions: R1+R2≥0.433R0, R1+R2≤0.593R0. By limiting the relationship between the radius R1 of the first curve segment 3111, the radius R2 of the second curve segment 3112, and the radius R0 of the middle arc segment 314, the total curvature of the first curve segment 3111 and the second curve segment 3112 is controlled, so that the guiding intensity of the side curve on the airflow is moderate. This avoids both excessive curvature causing airflow impact and insufficient curvature leading to insufficient pre-swirl, allowing the airflow to obtain a reasonable tangential velocity and balancing the pre-swirl effect and flow resistance.

[0075] like Figure 7 As shown, the radius R2 of the second curve segment 3112 and the radius R3 of the third curve segment 3121 satisfy: R2≥0.03R3, R2≤0.1R3, which limits the relationship between the radius R2 of the second curve segment 3112 and the radius R3 of the third curve segment 3121, making the curvature of the second curve segment 3112 greater than that of the third curve segment 3121. Thus, the sharp bend structure of the second curve segment 3112 forces the airflow to turn and establish a pre-rotation angle, and then the gentle bend structure of the third curve segment 3121 stabilizes the rotating flow state, effectively guiding the airflow to generate tangential deflection, enhancing the directionality of the airflow pre-rotation, making the airflow more closely follow the rotation direction of the volute 100, and reducing the flow loss inside the volute 100.

[0076] like Figure 7As shown, the radius R3 of the third curve segment 3121 and the radius R4 of the fourth curve segment 3122 satisfy: R4≥1.2R3, R4≤1.3R3. By limiting the relationship between the radius R3 of the third curve segment 3121 and the radius R4 of the fourth curve segment 3122, the radius R4 of the fourth curve segment 3122 is made to be 1.2-1.3 times the radius R3 of the third curve segment 3121. This makes the curvature of the guide channel in the recess 310 gradually flatten, reduces the centrifugal force of the airflow rotation and the friction loss of the wall of the recess 310, ensures that the pre-swirling airflow is smoothly introduced into the volute 100, and reduces energy dissipation.

[0077] like Figure 6 As shown, the guide curve includes a third curve 313, which connects to the end of the third curve segment 3121 facing the collector inlet 301. The third curve 313 and the third curve segment 3121 are located on the same side of the middle arc segment 314. The third curve 313 bulges away from the middle arc segment 314, so that the third curve 313 can be used to fine-tune the airflow when it is about to enter the collector inlet 301, so that the airflow is more accurately aligned with the center of the collector inlet 301, reducing the edge vortex of the collector inlet 301, optimizing the airflow distribution at the collector inlet 301, increasing the intake efficiency, and reducing edge energy loss.

[0078] The radii R3 of the third curve segment 3121, R4 of the fourth curve segment 3122, R5 of the third curve 313, and R0 of the middle arc segment 314 satisfy the following conditions: R3 + R4 + R5 ≥ 0.564R0, R3 + R4 + R5 ≤ 0.768R0. By limiting the relationship between the radii R3 of the third curve segment 3121, R4 of the fourth curve segment 3122, R5 of the third curve 313, and R0 of the middle arc segment 314, the total curvature of the third curve segments 3121, 3122, and 313 is controlled. This ensures that the guidance of airflow on one side of the curve is balanced with that on the other side, avoiding excessive airflow deflection or asymmetrical pre-swirl due to excessively large or small ratios. This results in a symmetrical and stable pre-swirl flow field, increasing the overall stability and reliability of the collector 300.

[0079] It should be noted that the connection between two adjacent curve segments on the guide curve is a smooth transition to reduce airflow resistance.

[0080] It should also be noted that, in some embodiments, when designing the guide curve, the middle arc segment 314, the second curve segment 3112, the third curve segment 3121, the fourth curve segment 3122 and the third curve 313 are first determined, and finally the first curve segment 3111 is determined by making the first curve segment 3111 tangent to the second curve segment 3112 and the third curve 313.

[0081] In other embodiments, the guide curve is adjusted toward the air intake organization direction of the matching collector 300 by changing the centroid position of the middle arc segment 314.

[0082] The guide curve can be airfoil-shaped or slender petal-shaped, so that the recess 310 can better guide the airflow pre-swirl.

[0083] like Figures 1-4 As shown, multiple recesses 310 are provided, and the multiple recesses 310 are arranged along the circumference of the collector 300 to ensure the pre-swirl effect of the collector 300 on the airflow.

[0084] The number N of recesses 310 and the inner diameter D1 and outer diameter D2 of collector 300 satisfy the following conditions: N≥0.05*(D1+D2), N≤0.08*(D1+D2), so that the number of recesses 310 matches the size of collector 300, and the recesses 310 are evenly distributed in the circumference to form a continuous and uniform pre-swirling flow field, which increases the overall intake efficiency and stability, and avoids that too many recesses 310 will cause mutual interference of airflow between adjacent recesses 310, or that too few recesses 310 will not be able to cover the circumferential area of ​​collector 300.

[0085] In some embodiments, the recesses 310 are configured to be 20 in number, so that the windward surface of the collector 300 forms a continuous and uniform pre-swirling flow field, thereby increasing the overall intake efficiency and stability.

[0086] like Figure 8 As shown, when the windward surface of the collector 300 is a smooth curved surface, the vortex distribution on the windward surface of the collector 300 is relatively large.

[0087] like Figure 9 As shown, when the concave portion 310 is provided on the windward side of the collector 300, the vortex distribution on the windward surface of the collector 300 is less.

[0088] Setting a recessed portion 310 on the windward side of the collector 300 can effectively improve the airflow organization and distribution at the collector 300, reduce the risk of abnormal airflow noise, and enhance the working effect of the blades.

[0089] Based on the aforementioned collector 300, such as Figure 10 and Figure 11 As shown, this application also provides a total heat exchanger, which includes a housing 400 for forming the overall appearance of the total heat exchanger.

[0090] An air inlet 401 is formed on the housing 400. The air inlet 401 is located on the outer peripheral wall of the housing 400, and air enters the interior of the housing 400 through the air inlet 401.

[0091] An air outlet 402 is formed on the housing 400. The air outlet 402 is located on the outer peripheral wall of the housing 400. Air inside the housing 400 is output to the outside of the housing 400 through the air outlet 402.

[0092] In some embodiments, the housing air outlet 402 and the housing air inlet 401 are provided on opposite side peripheral walls of the housing 400.

[0093] A fresh air duct is formed inside the casing 400, and the air inlet 401 of the casing is connected to the fresh air duct.

[0094] An exhaust duct is formed inside the casing 400, and the air outlet 402 of the casing is connected to the exhaust duct.

[0095] The total heat exchanger includes a heat exchange core 500, which is located inside the casing 400 and is used to exchange heat with the air passing through the heat exchange core 500. Specifically, the air in the fresh air duct and the air in the exhaust air duct exchange heat at the heat exchange core 500.

[0096] The total heat exchanger includes a volute 100, which is located inside the housing 400. A volute air inlet 102 is formed on the volute 100, which communicates with the housing air inlet 401 so that air entering the housing 400 can enter the volute 100 through the volute air inlet 102.

[0097] A volute air outlet 101 is formed on the volute 100, and the volute air outlet 101 is connected to the housing air outlet 402 so that the air inside the volute 100 can be output to the outside of the housing 400 through the housing air outlet 402.

[0098] The total heat exchanger includes a centrifugal fan 200, which is located inside the volute 100. The centrifugal fan 200 is used to promote airflow and increase the heat exchange efficiency between the airflow and the heat exchange core 500.

[0099] The total heat exchanger includes the aforementioned collector 300, which is located at the air inlet 102 of the volute and is used to pre-swirl the airflow in the channel entering the centrifugal fan 200.

[0100] During the operation of the total heat exchanger, under the action of the centrifugal fan 200, indoor air enters the casing 400 through the casing air inlet 401 and comes into contact with the heat exchange core 500. After heat exchange through the heat exchange core 500, the air is finally discharged to the outside through the casing air outlet 402.

[0101] A recessed portion 310 is provided on the windward side of the collector 300 in the total heat exchanger. One end of the recessed portion 310 is oriented towards the air inlet 301 of the collector, and the other end is far away from the air inlet 301 of the collector. This creates a guide channel within the recessed portion 310 for airflow to enter the air inlet 301 of the collector. By first increasing and then decreasing the width of the recessed portion 310 in the direction close to the air inlet 301, and then increasing and then decreasing the width of the guide channel in the direction of airflow, the airflow first diffuses and reduces the velocity and increases the static pressure within the recessed portion 310, and then contracts, accelerates, and aligns with the air inlet 301 of the collector. Combined with the pre-swirl effect, this optimizes the state of airflow entering the volute 100, reduces fan energy consumption, increases the overall efficiency of the total heat exchanger, reduces airflow noise, and improves equipment operating stability.

[0102] The aforementioned collector 300 can also be applied to equipment such as indoor units of vertical air conditioners; the specific structure of the total heat exchanger is existing technology in this field and will not be described in detail here.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0104] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A collector, wherein the collector is provided with a collector inlet for airflow to pass through; characterized in that, The collector has a recessed portion on its windward surface, which is located on the outer periphery of the collector's air inlet to guide the airflow to pre-swirl; the projection of the bottom surface of the recessed portion defines a guide curve defined by the outline of the recessed portion, one end of the guide curve in the length direction is set towards the collector's air inlet, and the other end of the guide curve in the length direction is set away from the collector's air inlet. Define a middle arc segment, which is an arc passing through both ends of the guide curve along its length, and the convex direction of the middle arc segment is opposite to the rotation direction of the airflow; The guiding curve includes: The first curve is located on one side of the convex middle arc segment. One end of the first curve is set towards the air inlet of the collector, and the other end of the first curve is set away from the air inlet of the collector. Along the direction away from the opening of the collector, the first curve first convexes towards the middle arc segment and then convexes away from the middle arc segment. The second curve is located on the other side of the middle arc segment. One end of the second curve is set towards the air inlet of the collector, and the other end of the second curve is set away from the air inlet of the collector. The second curve protrudes towards the middle arc segment. The distance between the first curve and the second curve first increases and then decreases in the direction closer to the air inlet of the collector.

2. The current collector according to claim 1, characterized in that, The first curve includes a first curve segment and a second curve segment. The first curve segment is located near the air inlet of the collector, and the second curve segment is connected to the end of the first curve segment away from the air inlet of the collector. The first curve segment protrudes in a direction away from the middle arc segment, and the second curve segment protrudes in a direction towards the middle arc segment. The curvature of the first curve segment is less than or equal to the curvature of the second curve segment.

3. The current collector according to claim 2, characterized in that, The radius R1 of the first curve segment and the radius R2 of the second curve segment satisfy: R1≥0.47R2, R1≤0.49R2; And / or, the radius R1 of the first curve segment, the radius R2 of the second curve segment, and the radius R0 of the middle arc segment satisfy: R1+R2≥0.433R0, R1+R2≤0.593R0.

4. The current collector according to claim 2, characterized in that, The second curve includes a third curve segment and a fourth curve segment. The third curve segment is located near the air inlet of the collector, and the fourth curve segment is connected to the end of the third curve segment away from the air inlet of the collector. The third curve segment and the fourth curve segment bulge towards the direction of the middle arc segment. The curvature of the third curve segment is less than that of the fourth curve segment.

5. The current collector according to claim 4, characterized in that, The radius R3 of the third curve segment and the radius R4 of the fourth curve segment satisfy: R4≥1.2R3, R4≤1.3R3; And / or, the radius R2 of the second curve segment and the radius R3 of the third curve segment satisfy: R2≥0.03R3, R2≤0.1R3.

6. The current collector according to claim 4, characterized in that, The guide curve also includes a third curve, which is connected to the end of the third curve segment facing the air inlet of the collector. The third curve and the third curve segment are located on the same side of the middle arc segment, and the third curve protrudes in a direction away from the middle arc segment.

7. The current collector according to claim 6, characterized in that, The radius R3 of the third curve segment, the radius R4 of the fourth curve segment, the radius R5 of the third curve, and the radius R0 of the middle arc segment satisfy: R3+R4+R5≥0.564R0, R3+R4+R5≤0.768R0.

8. The current collector according to claim 1, characterized in that, The radius R0 of the middle arc segment satisfies the following relationship with the inner diameter D1 and the outer diameter D2 of the collector: R0≥0.792*(D1+D2), R0≤1.1*(D1+D2).

9. The current collector according to claim 1, characterized in that, The recessed portion is provided in multiple ways, and the multiple recessed portions are arranged circumferentially along the collector; The number N of the recesses and the inner diameter D1 and outer diameter D2 of the collector satisfy the following conditions: N≥0.05*(D1+D2), N≤0.08*(D1+D2).

10. A total heat exchanger, characterized in that, include: The housing contains a fresh air duct and an exhaust air duct. A heat exchange core is disposed inside the housing, and the air in the fresh air duct and the air in the exhaust air duct exchange heat at the heat exchange core. The volute has an air inlet and an air outlet, the air inlet being connected to the air inlet of the housing, and the air outlet being connected to the air outlet of the housing. A centrifugal fan, wherein the centrifugal fan is located inside the volute; The collector as described in any one of claims 1-9, wherein the collector is disposed at the air inlet of the volute; the collector is provided with a collector air inlet for airflow to pass through, and the collector air inlet constitutes the air inlet of the volute.

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