Energy-saving and noise-reducing centrifugal fan

Abstract

The application discloses an energy-saving and noise-reducing centrifugal fan, and relates to the technical field of centrifugal fans.The centrifugal fan body;an air outlet adjusting assembly is installed at the output end of the centrifugal fan body;the air outlet adjusting assembly comprises a four-pyramid-taillike inner guide frame fixedly connected to the outer side of the output end of the centrifugal fan body and a rectangular base frame, four four-corner guide rails and four middle guide rails are fixedly connected to the side of the base frame facing the inner guide frame, the four four-corner guide rails and the four middle guide rails are alternately and spacedly distributed in the circumferential direction;one flow guide cover is slidably connected between each four-corner guide rail and the inner guide frame, and the four flow guide covers can reduce or enlarge the cross-sectional area of the air outlet of the centrifugal fan body by moving forward and backward.The synchronous forward and backward movement of the four flow guide covers can adjust the cross-sectional area of the air outlet of the centrifugal fan, so that the vortex and flow separation are reduced, the aerodynamic noise is reduced, and the operation energy efficiency under the non-design working condition is improved.

Description

Technical Field

[0001] This invention belongs to the field of centrifugal fan technology, and in particular relates to an energy-saving and noise-reducing centrifugal fan. Background Technology

[0002] Centrifugal fans are widely used in the thermal management system of energy storage equipment. The operating conditions of energy storage equipment fluctuate drastically with the grid load, charge and discharge rate and ambient temperature. This requires the fans to maintain high efficiency, low noise and stable operation over an ultra-wide flow range. Variable frequency speed control technology can achieve significant energy savings near the rated operating conditions by changing the motor speed to match the load demand.

[0003] However, the outlet geometry of existing variable frequency centrifugal fans is fixed and cannot be adjusted synchronously with changes in speed. When the fan deviates from the design conditions, especially when running at low load, the fixed outlet causes the airflow and volute structure to deteriorate, generating additional eddies and flow separation. This not only increases energy consumption but also causes significant low- and medium-frequency aerodynamic noise, affecting the economic efficiency and environmental friendliness of energy storage equipment.

[0004] To address these issues, we provide an energy-saving and noise-reducing centrifugal fan. Summary of the Invention

[0005] The purpose of this invention is to provide an energy-saving and noise-reducing centrifugal fan. By setting an air outlet adjustment component with an adjustable air outlet cross-sectional area, the problem of deteriorated airflow matching, increased vortex and flow separation, increased energy consumption and increased aerodynamic noise caused by the fixed air outlet in existing centrifugal fans under non-design operating conditions is solved.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to an energy-saving and noise-reducing centrifugal fan, comprising a centrifugal fan body; an air outlet regulating component for adjusting the cross-sectional area of ​​the air outlet is installed at the output end of the centrifugal fan body; The air outlet adjustment assembly includes a frustum-shaped inner guide frame and a rectangular base frame fixedly connected to the outside of the output end of the centrifugal fan body. Four corner guide rails and four central guide rails are fixedly connected to the side of the base frame facing the inner guide frame. The four corner guide rails and the four central guide rails are alternately distributed along the circumference. Each of the four corner guide rails is slidably connected to the inner guide frame with a flow guide shroud. The four flow guide shrouds can reduce or expand the cross-sectional area of ​​the air outlet of the centrifugal fan body by moving back and forth. Each of the central guide rails is equipped with a connecting component for sealing the gap between two adjacent fairings; A push-pull plate is provided between the four air deflectors and the base frame to drive the four air deflectors to move synchronously. A power component is provided inside the base frame to drive the push-pull plate to move back and forth.

[0007] The invention is further configured such that four evenly distributed and radially extending oblique guide grooves are provided on the push-pull plate, and a slider is fixedly connected to one end of each of the four flow guides facing the push-pull plate. The slider slides in the corresponding oblique guide groove, and a baffle is fixedly connected to one end of the slider facing the base frame.

[0008] The present invention is further configured such that the connecting assembly includes a connecting plate, the connecting plate having mutually perpendicular and intersecting transverse guide grooves and longitudinal guide grooves inside, the central guide rail being slidably fitted in the longitudinal guide groove, and two symmetrically arranged transverse guide rails being slidably connected in the transverse guide groove, the two transverse guide rails being respectively fixedly connected to the top of two adjacent flow guides.

[0009] The present invention is further configured such that an outer cover is fixedly connected to the outside of the base frame, and the outer cover is disposed outside the four corner guide rails.

[0010] The present invention is further configured such that two symmetrically distributed screws are fixedly connected to the side of the push-pull plate away from the flow guide.

[0011] The present invention is further configured such that the base frame includes a box body with an internal grid structure and a cover plate fixedly connected to the side of the box body away from the flow guide. The box body has two threaded sleeves rotatably connected inside, and the two threaded sleeves are respectively threaded onto the outside of the two screws. Each threaded sleeve is fixedly connected to the outside of a first bevel gear.

[0012] The present invention is further configured such that the power assembly includes a drive shaft rotatably connected to the inside of the cover plate and an adjustment motor fixedly connected to the outside of the cover plate, the drive shaft being fixedly connected to the output end of the adjustment motor; the inside of the box is provided with a transmission system for synchronously driving the two threaded sleeves to rotate, and a second bevel gear for connecting the input end of the transmission system is fixedly connected to one end of the drive shaft located inside the box.

[0013] The present invention is further configured such that the transmission system consists of a bevel gear set and a linkage mechanism.

[0014] The present invention is further configured such that a rectangular ring-shaped sealing brush is fixedly connected to one end of the inner guide frame away from the base frame, and the sealing brush is used to seal the gap between the flow guide and the connecting plate and the inner guide frame.

[0015] The present invention is further configured such that a sealing strip is fixedly connected to the inner side of the outer cover, the sealing strip being used to seal the gap between the flow guide and the connecting plate and the outer cover.

[0016] The present invention has the following beneficial effects: By moving the four guide shrouds in the air outlet adjustment assembly back and forth synchronously, the present invention achieves continuous and stepless adjustment of the cross-sectional area of ​​the centrifugal fan outlet, thereby dynamically optimizing the matching degree between the airflow and the volute according to the actual working conditions, reducing eddies and flow separation, reducing aerodynamic noise, and improving the operating efficiency under non-design conditions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the reduced air outlet cross-section of the centrifugal fan body of the present invention.

[0019] Figure 2 This is a schematic diagram of the enlarged air outlet cross-section of the centrifugal fan body of the present invention.

[0020] Figure 3 This is an exploded structural diagram of the air outlet regulating component of the present invention.

[0021] Figure 4 This is a schematic diagram of the air outlet regulating component of the present invention in the open state.

[0022] Figure 5 This is a schematic diagram of the push-pull plate and flow guide of the present invention.

[0023] Figure 6 This is a schematic diagram of the connection component of the present invention.

[0024] Figure 7 This is a cross-sectional view of the air outlet regulating component of the present invention.

[0025] Figure 8 This is a schematic diagram of the internal structure of the basic frame of the present invention.

[0026] The attached diagram lists the components represented by each number as follows: 100. Centrifugal fan body; 200. Air outlet adjustment assembly; 201. Inner guide frame; 201a. Sealing brush; 202. Base frame; 202a. Box body; 202b. Cover plate; 202c. Threaded sleeve; 202d. First bevel gear; 203. Four corner guide rails; 204. Draft shield; 204a. Slider; 204b. Baffle; 205. Central guide rail; 206. Connecting assembly; 206a. Connecting plate; 206a-1. Transverse guide groove; 206a-2. Longitudinal guide groove; 206b. Transverse guide rail; 207. Outer cover; 208. Push-pull plate; 208a. Angled guide groove; 208b. Screw; 209. Power assembly; 209a. Drive shaft; 209b. Transmission system; 209c. Adjustment motor; 209d. Second bevel gear. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1 to 3This invention relates to an energy-saving and noise-reducing centrifugal fan, comprising a centrifugal fan body 100; an air outlet adjustment assembly 200 for adjusting the cross-sectional area of ​​the air outlet is installed at the output end of the centrifugal fan body 100; the air outlet adjustment assembly 200 includes a frustum-shaped inner guide frame 201 fixedly connected to the outside of the output end of the centrifugal fan body 100 and a rectangular base frame 202. Four corner guide rails 203 and four center guide rails 205 are fixedly connected to the side of the base frame 202 facing the inner guide frame 201. The four corner guide rails 203 and four center guide rails 205 are alternately distributed circumferentially. The frustum-shaped inner guide frame 201 provides smooth transition guidance for the airflow, reducing local resistance loss, while the alternately distributed corner guide rails 203 and center guide rails 205 constitute a stable guide frame, providing reliable support and limiting for the smooth movement of the subsequent air guide shroud 204; each Each of the four corner guide rails 203 and the inner guide frame 201 is slidably connected to a guide hood 204. The four guide hoods 204 can reduce or expand the cross-sectional area of ​​the air outlet of the centrifugal fan body 100 by moving back and forth. By the synchronous back and forth sliding of the four guide hoods 204 on the four corner guide rails 203, the cross-sectional area of ​​the air outlet is continuously and steplessly adjusted. Each central guide rail 205 is equipped with a connecting component 206 for sealing the gap between two adjacent guide hoods 204. The connecting component 206 can dynamically compensate for the gap between adjacent guide hoods 204 as the guide hoods 204 move, effectively preventing airflow from flowing out from the gap between the hoods. A push-pull plate 208 is provided between the four guide hoods 204 and the base frame 202 for driving the four guide hoods 204 to move synchronously. The base frame 202 is equipped with a power component 209 for driving the push-pull plate 208 to move back and forth.

[0029] Specifically, by integrating an air outlet adjustment component 200 at the output end of the centrifugal fan body 100, the geometric cross-sectional area of ​​the air outlet can be dynamically adjusted according to the actual operating conditions of the fan. This effectively improves the matching degree between the airflow and the volute structure, reduces eddies and flow separation caused by the fixed air outlet, lowers low- and medium-frequency aerodynamic noise, and improves the operating efficiency of the fan under non-design conditions, thereby achieving energy saving and noise reduction.

[0030] Example 1, please refer to Figures 3 to 8The push-pull plate 208 has four evenly distributed and radially extending oblique guide grooves 208a. Each of the four flow guides 204 has a slider 204a fixedly connected to one end facing the push-pull plate 208. The slider 204a slides within the corresponding oblique guide groove 208a. A baffle 204b is fixedly connected to the end of the slider 204a facing the base frame 202. Through the cooperation of the radial oblique guide grooves 208a and the sliders 204a, the linear motion of the push-pull plate 208 is converted into the synchronous sliding of the four flow guides 204 along the four corner guide rails 203. The connecting assembly 206 includes a connecting plate 206a, which has mutually perpendicular and intersecting transverse guide grooves 206a-1 and longitudinal guide grooves inside. 206a-2, the central guide rail 205 is slidably fitted within the longitudinal guide groove 206a-2, and two symmetrically arranged transverse guide rails 206b are slidably connected within the transverse guide groove 206a-1. The two transverse guide rails 206b are respectively fixedly connected to the tops of two adjacent flow guide shrouds 204. The fit between the longitudinal guide groove 206a-2 and the central guide rail 205 ensures the axial movement of the connecting plate 206a, while the fit between the transverse guide groove 206a-1 and the transverse guide rails 206b allows relative sliding between adjacent flow guide shrouds 204 during radial movement. An outer cover 207 is fixedly connected to the outside of the base frame 202. The outer cover 207 covers the outside of the four corner guide rails 203. 03. The rear of the fairing 204 and moving parts such as the connecting assembly 206 are covered within it, providing protection against dust and debris intrusion. Two symmetrically distributed screws 208b are fixedly connected to the side of the push-pull plate 208 away from the fairing 204. These two symmetrically distributed screws 208b ensure even force distribution on the push-pull plate 208, avoiding uneven loading and jamming that may occur due to unilateral drive, and ensuring the synchronicity and stability of the fairing 204's movement. The base frame 202 includes a box 202a with an internal grid structure and a cover plate 202b fixedly connected to the side of the box 202a away from the fairing 204. Two threaded sleeves 202c are rotatably connected inside the box 202a. The two screws 208b are threaded onto the outside of the screws 202c respectively, and a first bevel gear 202d is fixedly connected to the outside of each threaded sleeve 202c; the power assembly 209 includes a drive shaft 209a rotatably connected to the inside of the cover plate 202b and an adjustment motor 209c fixedly connected to the outside of the cover plate 202b, with the output end of the drive shaft 209a fixedly connected to the output end of the adjustment motor 209c; the inside of the housing 202a is provided with a transmission system 209b for synchronously driving the rotation of the two threaded sleeves 202c, and a second bevel gear 209d for connecting the input end of the transmission system 209b is fixedly connected to one end of the drive shaft 209a inside the housing 202a; the transmission system 209b consists of a bevel gear set and a linkage mechanism.

[0031] In this embodiment, by adjusting the motor 209c to drive the drive shaft 209a to rotate, the second bevel gear 209d at the end of the drive shaft 209a simultaneously drives the two first bevel gears 202d and the corresponding threaded sleeves 202c to rotate synchronously via the transmission system 209b. The two threaded sleeves 202c are respectively threadedly engaged with the two screws 208b, driving the push-pull plate 208 to move linearly along the axial direction. When the push-pull plate 208 moves back and forth, the oblique guide groove 208a forces the slider 204a to drive the guide shield 204 to guide along the four corners. The guide rail 203 slides synchronously, thereby continuously reducing or expanding the cross-sectional area of ​​the air outlet. During the movement of the air guide 204, the connecting plate 206a is slidably installed on the middle guide rail 205 via the longitudinal guide groove 206a-2. The transverse guide rails 206b on the top of the adjacent air guide 204 slide and engage with the transverse guide grooves 206a-1 in the connecting plate 206a, allowing the air guide 204 to slide relative to each other when moving radially, thereby achieving synchronous and stepless adjustment of the air outlet area, thus optimizing airflow matching and reducing aerodynamic noise.

[0032] Example 2, please refer to Figure 3 and Figure 7 Based on the first specific embodiment, a rectangular ring-shaped sealing brush 201a is fixedly connected to one end of the inner guide frame 201 away from the base frame 202. The sealing brush 201a is used to seal the gap between the guide shroud 204 and the connecting plate 206a and the inner guide frame 201. A sealing strip is fixedly connected to the inner side of the outer cover 207. The sealing strip is used to seal the gap between the guide shroud 204 and the connecting plate 206a and the outer cover 207.

[0033] In this embodiment, the sealing brush 201a can form a dynamic flexible seal between the front end of the flow guide 204 and the connecting plate 206a and the mating surface of the inner guide frame 201. The brush material can effectively block the airflow from leaking out of the mating gap, and will not generate too much resistance to the sliding of the flow guide 204. The sealing strip forms a second dynamic sealing barrier between the outer cover 207 and the outer side of the flow guide 204 and the connecting plate 206a. It cooperates with the sealing brush 201a inside and out to prevent the airflow from escaping from the periphery of the movable parts.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, 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.

[0035] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. An energy-saving and noise-reducing centrifugal fan, comprising a centrifugal fan body (100); characterized in that: The centrifugal fan body (100) is equipped with an air outlet regulating component (200) for adjusting the cross-sectional area of ​​the air outlet. The air outlet regulating component (200) includes a frustum-shaped inner guide frame (201) and a rectangular base frame (202) fixedly connected to the outside of the output end of the centrifugal fan body (100). The base frame (202) has four corner guide rails (203) and four center guide rails (205) fixedly connected to the side facing the inner guide frame (201). The four corner guide rails (203) and the four center guide rails (205) are distributed alternately along the circumference. Each of the four corner guide rails (203) is slidably connected to the inner guide frame (201) with a flow guide shroud (204). The four flow guide shrouds (204) can reduce or expand the cross-sectional area of ​​the air outlet of the centrifugal fan body (100) by moving back and forth. Each of the central guide rails (205) is equipped with a connecting assembly (206) for sealing the gap between two adjacent fairings (204). A push-pull plate (208) for driving the four air deflectors (204) to move synchronously is provided between the four air deflectors (204) and the base frame (202). A power component (209) for driving the push-pull plate (208) to move back and forth is provided inside the base frame (202).

2. The energy-saving and noise-reducing centrifugal fan according to claim 1, characterized in that, The push-pull plate (208) has four evenly distributed and radially extending oblique guide grooves (208a). Each of the four flow guides (204) has a slider (204a) fixedly connected to one end facing the push-pull plate (208). The slider (204a) slides in the corresponding oblique guide groove (208a). The slider (204a) has a baffle (204b) fixedly connected to one end facing the base frame (202).

3. The energy-saving and noise-reducing centrifugal fan according to claim 1, characterized in that, The connecting assembly (206) includes a connecting plate (206a). The connecting plate (206a) has mutually perpendicular and intersecting transverse guide grooves (206a-1) and longitudinal guide grooves (206a-2). The central guide rail (205) is slidably fitted in the longitudinal guide groove (206a-2). Two symmetrically arranged transverse guide rails (206b) are slidably connected in the transverse guide groove (206a-1). The two transverse guide rails (206b) are respectively fixedly connected to the top of the two adjacent flow guides (204).

4. The energy-saving and noise-reducing centrifugal fan according to claim 1, characterized in that, An outer cover (207) is fixedly connected to the outside of the base frame (202), and the outer cover (207) covers the outside of the four corner guide rails (203).

5. The energy-saving and noise-reducing centrifugal fan according to claim 1, characterized in that, The push-pull plate (208) is fixedly connected to two symmetrically distributed screws (208b) on the side opposite to the flow guide (204).

6. The energy-saving and noise-reducing centrifugal fan according to claim 5, characterized in that, The base frame (202) includes a box (202a) with an internal grid structure and a cover plate (202b) fixedly connected to the side of the box (202a) away from the shroud (204). The box (202a) is rotatably connected to two threaded sleeves (202c). The two threaded sleeves (202c) are respectively threaded onto the outside of the two screws (208b). A first bevel gear (202d) is fixedly connected to the outside of each threaded sleeve (202c).

7. The energy-saving and noise-reducing centrifugal fan according to claim 6, characterized in that, The power assembly (209) includes a drive shaft (209a) rotatably connected inside the cover plate (202b) and an adjustment motor (209c) fixedly connected to the outside of the cover plate (202b). The drive shaft (209a) is fixedly connected to the output end of the adjustment motor (209c). The housing (202a) is provided with a transmission system (209b) for synchronously driving the two threaded sleeves (202c) to rotate. One end of the drive shaft (209a) located inside the housing (202a) is fixedly connected to a second bevel gear (209d) for connecting to the input end of the transmission system (209b).

8. The energy-saving and noise-reducing centrifugal fan according to claim 7, characterized in that, The transmission system (209b) consists of a bevel gear set and a linkage mechanism.

9. The energy-saving and noise-reducing centrifugal fan according to claim 3, characterized in that, A rectangular ring-shaped sealing brush (201a) is fixedly connected to one end of the inner guide frame (201) away from the base frame (202). The sealing brush (201a) is used to seal the gap between the flow guide (204) and the connecting plate (206a) and the inner guide frame (201).

10. An energy-saving and noise-reducing centrifugal fan according to claim 4, characterized in that, A sealing strip is fixedly connected to the inner side of the outer cover (207), and the sealing strip is used to seal the gap between the flow guide (204) and the connecting plate (206a) and the outer cover (207).

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