Double-volute centrifugal fan with inlet airflow guide structure

Abstract

The invention discloses a double-volute centrifugal fan with an inlet airflow guiding structure, and relates to the technical field of centrifugal fans. The device comprises a base, a first volute is fixedly mounted at the top of the base, an air inlet is formed in the front face of the first volute, an air outlet which is vertically and upwards formed is fixedly mounted at the edge of the top of the first volute, and an impeller corresponding to the air inlet is rotatably mounted in the first volute; a servo motor arranged behind the first volute is fixedly installed on the top of the base, a driving shaft of the servo motor is fixedly connected with the impeller, and a second volute corresponding to the air inlet is installed on the front face of the first volute. The air inlet pipe is arranged to be of a transverse structure, the end opening of the air inlet pipe faces the side face, the filter screen is installed at the end opening of the air inlet pipe in a matched mode, external impurities and foreign matter can be effectively prevented from entering the device through the air inlet pipe, and the stability of the device in the working process can be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal fans, and in particular to a double-volute centrifugal fan with an inlet air flow guiding structure. Background Art

[0002] Centrifugal fans and axial flow fans are commonly used ventilation machines in the prior art. Among them, axial flow fans have large air volume and low air pressure, while centrifugal fans have small air volume and high air pressure. In actual use, different types of fan equipment are usually selected according to the needs of use.

[0003] The centrifugal fan in the prior art is usually composed of a volute and an impeller. The impeller rotates at high speed in the volute to generate centrifugal force on the airflow, thereby forming a negative pressure in the middle of the impeller to achieve the pumping and conveying of the airflow. In the prior art, although a lot of improvements have been made to the centrifugal fan, it still has the following shortcomings:

[0004] 1. For traditional centrifugal fans, the external airflow enters the fan impeller through the air inlet. At this time, the airflow needs to turn 90° when entering the impeller from the outside to the inside. Then, driven by the rotation of the impeller, the airflow needs to turn 90° again when entering the impeller blades. Under the action of centrifugal force, the airflow still needs to turn 90° when it is thrown out of the impeller in the tangential direction. The airflow changes direction three times in this process. The energy consumption increases once the wind direction changes, which leads to low efficiency of the centrifugal fan. In order to improve this situation, the R&D personnel installed pre-rotation blades on the air inlet of the centrifugal fan to make the wind entering the impeller rotate, thereby reducing the energy consumption of the fan. However, the pre-rotation effect of this process is not ideal, and since most fans are equipped with wind condensers, there is insufficient space, which limits the installation of pre-rotation blades. In addition, if pre-rotation blades are installed, it is not convenient for the later maintenance of the fan. Therefore, the solution of adding pre-rotation blades is rarely used in actual use;

[0005] 2. Since the impeller in a traditional centrifugal fan is directly placed in the volute, and the volute is used to transport the high-pressure airflow, this causes the high-speed and low-pressure airflow driven by the centrifugal fan impeller to be squeezed by the low-speed and high-pressure airflow in the volute after leaving the impeller, resulting in backflow fluctuations and vortex airflow, affecting the working stability of the fan, and also generating a lot of noise. In response to the above problems, the inventor proposes a double-volute centrifugal fan with an inlet airflow guide structure to solve the above problems. Summary of the invention

[0006] In order to solve the problem that most fans are equipped with wind gathering hoods, resulting in insufficient space and restricting the installation of pre-swirl blades, and the high-speed low-pressure airflow driven by the centrifugal fan impeller will be squeezed by the low-speed high-pressure airflow in the volute after leaving the impeller, generating backflow fluctuations and vortex airflow, affecting the working stability of the fan; the purpose of the present invention is to provide a double-volute centrifugal fan with an inlet air flow guiding structure.

[0007] To solve the above technical problems, the present invention adopts the following technical scheme: a double-volume centrifugal fan with an inlet air flow guiding structure, comprising a base, a volute 1 is fixedly installed on the top of the base, and an air inlet is opened on the front of the volute 1, an air outlet arranged vertically upward is fixedly installed at the top edge position of the volute 1, an impeller corresponding to the air inlet is rotatably installed inside the volute 1, a servo motor arranged behind the volute 1 is fixedly installed on the top of the base, and the driving shaft of the servo motor is fixedly connected to the impeller, a volute 2 arranged corresponding to the air inlet is installed on the front of the volute 1, and the outer shape of the volute 2 is set to a truncated cone structure, a lining of a conical structure is set at the middle position of the volute 2, the internal diameters of the volute 2 and the lining are gradually reduced from front to back, the volute 2 and the front of the liner are fixedly connected by an annular cover, and an air inlet pipe is fixedly connected at the outer edge position of the annular cover.

[0008] Preferably, the air inlet pipe is transversely arranged at the outer edge of the annular cover, and a filter is fixedly installed at the port of the air inlet pipe.

[0009] Preferably, a guide pipe with a spiral structure is fixedly installed in the cavity formed by the volute 2, the liner and the annular cover, one end of the guide pipe is fixedly inserted in the interior of the air inlet pipe, and the other end of the guide pipe is connected to the air inlet port.

[0010] Preferably, the inner diameter of the guide tube gradually decreases from front to back.

[0011] Preferably, a plurality of longitudinally arranged metal heat sinks are evenly and fixedly arranged on the outer end wall of the second volute casing, and the shapes of the plurality of metal heat sinks are all arranged to be a thin sheet structure.

[0012] Preferably, the shape of some of the metal heat sinks is set to an L-shaped structure, one end of the back side of some of the metal heat sinks is in contact with the front side of the turbine housing, and a silicone pad is sandwiched between the metal heat sink and the turbine housing.

[0013] Preferably, the volute two is fixedly mounted on the front outer end wall of the volute one by means of bolts, and the bolts are mounted at the middle position between two adjacent metal heat sinks.

[0014] Preferably, a funnel-shaped air duct is fixedly installed on the top of the air outlet, and the internal diameter of the air duct gradually decreases from bottom to top. A diffuser cover with a funnel-shaped structure is fixedly installed at the middle position of the outer end wall of the air duct, and the internal diameter of the diffuser cover gradually expands from bottom to top. A through pipe is fixedly connected to the top of the diffuser cover.

[0015] Preferably, a sponge layer is fixedly mounted on the inner end wall of the connection between the air guide duct and the diffuser cover, and the interior of the sponge layer is arranged as a porous honeycomb structure.

[0016] Preferably, a guide plate with a cross-shaped structure is fixedly installed inside the air guide duct, and the bottom end of the guide plate is configured as a blade structure.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, the volute 2 with a truncated cone structure and the liner with a conical structure are connected to the front of the air inlet, and the annular cover and the air inlet pipe are used for guidance, so that the external airflow can enter the impeller through the air inlet at a large angle, so that when the device is conveying the airflow, the airflow only makes two 90° turns inside the device, and the energy consumption caused by the change of direction is reduced by reducing the number of 90° changes of the airflow, which is conducive to improving the working efficiency of the device. At the same time, by setting the internal diameter of the volute 2 and the liner to gradually decrease from front to back, the incoming airflow can be converged, thereby accelerating the airflow velocity, so that the airflow speed is close to or exceeds the linear velocity of the impeller rotation, which is conducive to further reducing the torque energy consumption of the device;

[0019] 2. In the present invention, the air inlet pipe is set as a horizontal structure so that the port of the air inlet pipe faces the side, and the filter is installed at the port of the air inlet pipe, which can effectively reduce the external impurities and foreign objects from entering the device through the air inlet pipe, which is beneficial to ensure the stability of the device during operation.

[0020] 3. In the present invention, a guide tube with a spiral structure is installed in the cavity formed by the volute, the inner liner and the annular cover, so that the external airflow can enter the middle position of the impeller through the guide tube, and the airflow flows in a spiral shape, which can effectively ensure the flow direction stability of the incoming airflow. By setting the internal diameter of the guide tube to gradually decrease from front to back, the incoming airflow can be further accelerated by utilizing the principle that the flow velocity of the airflow increases with a small diameter, thereby further reducing the energy loss during the operation of the device.

[0021] 4. In the present invention, multiple metal heat sinks are evenly surrounded and fixed on the outer end wall of the volute two, which can effectively increase the contact area between the volute two and the external airflow, thereby effectively improving the efficiency of heat dissipation from the inside of the volute two to the outside, which is beneficial to avoiding high-temperature burning caused by excessive air flow velocity inside the device, and to a certain extent ensures the working stability of the device.

[0022] 5. In the present invention, the shape of some metal heat sinks is set to be L-shaped, and the back end of the metal heat sink with the L-shaped structure is fitted with the front side of the volute one, so that the metal heat sink can assist in the heat dissipation operation inside the volute one, and the silicone pad is clamped between the metal heat sink and the volute one, the heat transfer stability between the volute one and the metal heat sink can be effectively guaranteed. At the same time, the metal heat sink set with an L-shaped structure can also effectively support the connection between the volute two and the liner, which is beneficial to improve the installation stability between the volute two and the volute one.

[0023] 6. In the present invention, the volute two is fixedly installed on the front side of the volute one by bolts, which is conducive to ensuring the convenience of disassembly and assembly of the volute two by the staff, thereby ensuring the convenience of operation of the staff when they perform maintenance on the device later. At the same time, by setting the bolts in the middle position of two adjacent metal heat sinks, sufficient operating space is reserved for the disassembly and assembly of the bolts, avoiding the inconvenience caused by the presence of the metal heat sink to the bolt disassembly operation.

[0024] 7. In the present invention, an air duct with an internal diameter that gradually decreases from bottom to top is installed above the air outlet, and a diffuser cover with an internal diameter that gradually increases from bottom to top is installed at the middle position of the outer end wall of the air duct. With the help of the air duct converging the airflow, the airflow can be accelerated when it is ejected outward at the diffuser cover, thereby producing an air suction effect on the surrounding airflow, reducing the pressure inside the air outlet, reducing the probability of airflow backflow, and avoiding noise caused by airflow backflow.

[0025] 8. In the present invention, the sponge layer is fixedly installed on the inner end wall of the connection between the air guide duct and the diffuser cover, so that the airflow in the reflux state can be effectively buffered. The interior of the sponge layer is set as a porous honeycomb structure, which is beneficial to enhance the buffering effect of the sponge layer on the kinetic energy of the airflow to a certain extent. At the same time, the honeycomb structure absorbs noise, which can further reduce the noise generated when the device is working, which is beneficial to ensure the working stability of the device.

[0026] 9. In the present invention, by installing a cross-shaped guide plate inside the air duct, the outlet of the air duct can be divided into four independent spaces, which is beneficial to guiding and dividing the airflow passing through the inside, thereby reducing the probability of backflow and air outlet vortex phenomenon of high-pressure airflow. At the same time, by setting the bottom end of the guide plate to a blade structure, the flowing airflow can be effectively broken, further ensuring the working stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the stereoscopic structure of the present invention under the first viewing angle.

[0029] Figure 2 It is a schematic diagram of the stereoscopic structure of the present invention under the second viewing angle.

[0030] Figure 3 It is a schematic diagram of the split diagram structure of the present invention.

[0031] Figure 4 It is a schematic diagram of the flow direction structure of the conventional centrifugal fan of the present invention when the airflow enters.

[0032] Figure 5 It is a schematic diagram of the flow direction structure of the airflow inside the air inlet of the present invention.

[0033] Figure 6 It is a schematic diagram of the flow direction structure of the airflow after entering the air inlet pipe of the present invention.

[0034] Figure 7 The figure is a schematic diagram of the flow direction structure of the airflow in the cavity between the volute 2 and the liner of the present invention.

[0035] Figure 8 It is a schematic diagram of the flow direction structure of the airflow inside the guide tube of the present invention.

[0036] Fig. 9 It is a schematic diagram of the side view structure of the guide tube of the present invention.

[0037] Fig.10 It is a schematic diagram of the flow direction structure of the airflow from the air guide duct of the present invention.

[0038] Fig.11 It is a schematic diagram of the noise reduction arc structure of the present invention.

[0039] In the figure: 1. base; 101. volute 1; 102. air inlet; 103. air outlet; 104. impeller; 105. servo motor; 2. volute 2; 201. lining; 202. annular cover; 203. air inlet pipe; 204. guide pipe; 205. filter; 206. metal heat sink; 207. silicone pad; 3. air guide duct; 301. diffuser cover; 302. through pipe; 303. sponge layer; 304. guide plate; 4. air outlet; 5. noise reduction arc; 6. blades; 7. bushing; 8. air inlet. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example: Figure 1-11 As shown, the present invention provides a technical solution: a double-volute centrifugal fan with an inlet air flow guiding structure, comprising a base 1, a volute 101 is fixedly installed on the top of the base 1, and an air inlet 102 is opened on the front of the volute 101, an air outlet 103 arranged vertically upward is fixedly installed at the top edge position of the volute 101, an impeller 104 corresponding to the air inlet 102 is rotatably installed inside the volute 101, a servo motor 105 arranged behind the volute 101 is fixedly installed on the top of the base 1, and the driving shaft of the servo motor 105 is fixedly connected to the impeller 104, and a servo motor 105 corresponding to the air inlet 102 is installed on the front of the volute 101. A volute 2 is provided, and the shape of the volute 2 is set to a truncated cone structure. A liner 201 of a conical structure is provided in the middle of the volute 2. The internal diameters of the volute 2 and the liner 201 gradually decrease from front to back. The front of the volute 2 and the liner 201 are fixedly connected by an annular cover 202, and the outer edge of the annular cover 202 is fixedly connected with an air inlet pipe 203. The present invention makes the centrifugal fan or water pump impeller air outlet 4 (water outlet) into an expanded structure, which is beneficial to reducing the impeller outlet pressure, thereby achieving energy saving, and the air outlet 4 (water outlet) end of the blade of the centrifugal fan or water pump impeller is made into a truncated cone shape, which is beneficial to reducing the noise of the impeller outlet. Fig.11 .

[0042] The air inlet pipe 203 is transversely arranged at the outer edge of the annular cover 202 , and a filter screen 205 is fixedly installed at the end of the air inlet pipe 203 .

[0043] By adopting the above technical solution, the air inlet pipe 203 is set as a horizontal structure, so that the port of the air inlet pipe 203 faces the side, and the filter 205 is installed at the port of the air inlet pipe 203, which can effectively reduce the external impurities and foreign matter from entering the device through the air inlet pipe 203, which is beneficial to ensure the stability of the device during operation.

[0044] A guide pipe 204 with a spiral structure is fixedly installed in the cavity formed by the volute 2, the liner 201 and the annular cover 202. One end of the guide pipe 204 is fixedly inserted into the inside of the air inlet pipe 203, and the other end of the guide pipe 204 is connected to the air inlet 102 accordingly.

[0045] By adopting the above technical solution, by installing the guide pipe 204 with a spiral structure in the cavity formed by the volute 2, the liner 201 and the annular cover 202, the external airflow can enter the middle position of the impeller 104 through the guide pipe 204, and the airflow flows in a spiral shape, which can effectively ensure the flow stability of the incoming airflow.

[0046] The inner diameter of the guide tube 204 gradually decreases from front to back.

[0047] By adopting the above technical solution, the internal diameter of the guide tube 204 is set to gradually decrease from front to back. By utilizing the principle that the velocity of the airflow increases with a small diameter, the incoming airflow can be further accelerated, thereby further reducing the energy loss during the operation of the device.

[0048] A plurality of longitudinally arranged metal heat sinks 206 are evenly and fixedly arranged on the outer end wall of the volute 2, and the appearance of the plurality of metal heat sinks 206 is a thin sheet structure.

[0049] By adopting the above-mentioned technical solution, multiple metal heat sinks 206 are evenly surrounded and fixed on the outer end wall of volute 2, which can effectively increase the contact area between volute 2 and the external airflow, thereby effectively improving the efficiency of heat dissipation from the inside of volute 2 to the outside, which is beneficial to avoiding high-temperature burning caused by excessive airflow velocity inside the device.

[0050] The shape of the partial metal heat sink 206 is set to an L-shaped structure, one end of the back side of the partial metal heat sink 206 is in contact with the front side of the turbine housing 101, and a silicone pad 207 is sandwiched between the metal heat sink 206 and the turbine housing 101.

[0051] By adopting the above technical solution, the shape of part of the metal heat sink 206 is set to be L-shaped, and the back end of the metal heat sink 206 with an L-shaped structure is fitted with the front side of the turbine casing 101, so that the metal heat sink 206 can assist in the heat dissipation operation inside the turbine casing 101, and the silicone pad 207 is clamped between the metal heat sink 206 and the turbine casing 101, which can effectively ensure the stability of the heat transfer between the turbine casing 101 and the metal heat sink 206.

[0052] The volute 2 is fixedly mounted on the front outer end wall of the volute 1 101 by means of bolts, and the bolts are mounted at the middle position of two adjacent metal heat sinks 206 .

[0053] By adopting the above technical solution, the volute 2 is fixedly installed on the front side of the volute 1 101 by bolts, which is conducive to ensuring the convenience of disassembly and assembly of the volute 2 by the staff, thereby ensuring the convenience of operation of the staff when they perform maintenance on the device later. At the same time, by setting the bolt in the middle position of two adjacent metal heat sinks 206, sufficient operating space is reserved for the disassembly and assembly of the bolt, avoiding the inconvenience caused by the presence of the metal heat sink 206 to the bolt disassembly operation.

[0054] A funnel-shaped air duct 3 is fixedly installed on the top of the air outlet 103, and the internal diameter of the air duct 3 gradually decreases from bottom to top. A diffuser hood 301 with a funnel-shaped structure is fixedly installed in the middle position of the outer end wall of the air duct 3, and the internal diameter of the diffuser hood 301 gradually increases from bottom to top. The top of the diffuser hood 301 is fixedly connected to a through pipe 302.

[0055] By adopting the above technical solution, the air duct 3 whose internal diameter gradually decreases from bottom to top is installed above the air outlet 103, and the diffuser 301 whose internal diameter gradually increases from bottom to top is installed at the middle position of the outer end wall of the air duct 3. With the help of the air duct 3 to converge the airflow, the airflow can be accelerated when it is ejected outward at the diffuser 301, thereby producing an air suction effect on the surrounding airflow, thereby reducing the pressure inside the air outlet 103 and reducing the probability of airflow backflow, thereby avoiding noise caused by airflow backflow.

[0056] A sponge layer 303 is fixedly mounted on the inner end wall of the connection between the air guide duct 3 and the diffuser cover 301, and the interior of the sponge layer 303 is configured as a porous honeycomb structure.

[0057] By adopting the above technical solution, the sponge layer 303 is fixedly installed on the inner end wall of the connection between the air guide duct 3 and the diffuser hood 301, which can effectively buffer the airflow in the reflux state. The interior of the sponge layer 303 is set as a porous honeycomb structure, which is beneficial to enhance the buffering effect of the sponge layer 303 on the kinetic energy of the airflow to a certain extent. At the same time, the honeycomb structure absorbs noise, which can further reduce the noise generated when the device is working, which is beneficial to ensure the working stability of the device.

[0058] A cross-shaped flow guide plate 304 is fixedly installed inside the air guide duct 3, and the bottom end of the flow guide plate 304 is configured as a blade structure.

[0059] By adopting the above technical solution, the guide plate 304 with a cross-shaped structure is installed inside the air guide duct 3, and the outlet of the air guide duct 3 can be divided into four independent spaces, which is beneficial to guiding and dividing the airflow passing through the inside, thereby reducing the probability of backflow and air outlet vortex phenomenon of high-pressure airflow. At the same time, by setting the bottom end of the guide plate 304 to a blade structure, the flowing airflow can be effectively broken, further ensuring the working stability of the device.

[0060] Working principle: When the device is working, the staff connects the device to an external power supply through a wire so that the external power supply provides power support for the device. Then, the staff controls the device to be powered on and started. After the servo motor 105 is powered on, it drives the impeller 104 fixedly connected to its drive shaft to rotate at high speed inside the volute 101. When the gas between the blades inside the impeller 104 rotates, it is subjected to the centrifugal force, thereby obtaining kinetic energy and being discharged from the periphery of the impeller 104. It is guided by the volute 101 to flow toward the air outlet 103, thereby forming a negative pressure in the center of the impeller 104, and the external airflow continuously flows into the impeller 104 through the air inlet 102. The device can discharge gas by continuous high-speed rotation of the impeller 104. In the prior art centrifugal fan, the air inlet 102 is directly exposed to the outside. When the centrifugal fan is started, the external airflow enters the middle position of the impeller 104 through the air inlet 102 and needs to make a first 90° turn. Then, when the airflow enters the blades inside the impeller 104, it needs to make a second 90° turn. When the airflow is discharged from the blades inside the impeller 104 to the outside, it needs to make a third 90° turn. As a result, the airflow needs to make three turns and changes in direction during the conveying process of the centrifugal fan. Each 90° turn and change of direction will greatly increase the energy consumption of the centrifugal fan.

[0061] When the device is conveying the airflow, the airflow only makes two 90° turns inside the device. By reducing the number of 90° turns of the airflow, the energy consumption caused by the change of direction is reduced, which is beneficial to improving the working efficiency of the device. At the same time, by setting the internal diameter of the volute 2 and the liner 201 to gradually decrease from front to back, the incoming airflow can be converged, thereby accelerating the airflow velocity, so that the airflow rotation speed approaches or exceeds the linear velocity of the impeller 104, which is beneficial to further reduce the torque energy consumption of the device. When the device is working, by setting the air inlet pipe 203 to a horizontal structure so that the port of the air inlet pipe 203 faces the side, and the filter 205 is installed at the port of the air inlet pipe 203, it can effectively reduce the entry of foreign matter into the device through the air inlet pipe 203, which is beneficial to ensure the stability of the device during operation.

[0062] When the device is working, by installing the guide pipe 204 with a spiral structure in the cavity formed by the volute 2, the liner 201 and the annular cover 202, the external airflow can enter the middle position of the impeller 104 through the guide pipe 204, and the airflow is made to flow in a spiral shape, which can effectively ensure the flow direction stability of the incoming airflow. By setting the internal diameter of the guide pipe 204 to gradually decrease from front to back, the incoming airflow can be further accelerated by virtue of the principle that the airflow velocity increases with a small diameter, thereby further reducing the energy loss during the operation of the device. By evenly surrounding and fixing a plurality of metal heat sinks 206 on the outer end wall of the volute 2, the contact area between the volute 2 and the external airflow can be effectively increased, thereby effectively improving the efficiency of heat dissipation from the inside of the volute 2 to the outside, which is conducive to avoiding the high-temperature burning phenomenon caused by the excessively fast airflow velocity inside the device, and to a certain extent ensures the working stability of the device.

[0063] When the device is working, by setting the shape of part of the metal heat sink 206 to be L-shaped, and fitting one end of the back of the metal heat sink 206 with the L-shaped structure to the front of the volute 101, the metal heat sink 206 can assist in the heat dissipation operation inside the volute 101, and by clamping the silicone pad 207 between the metal heat sink 206 and the volute 101, the heat transfer between the volute 101 and the metal heat sink 206 can be effectively guaranteed to be stable. At the same time, the metal heat sink 206 with the L-shaped structure can also heat the volute 2 and the liner 2 01 is effectively supported, which is conducive to improving the installation stability between the volute 2 and the volute 1 101. The volute 2 is fixedly installed on the front of the volute 1 101 by bolts, which is conducive to ensuring the convenience of disassembly and assembly of the volute 2 by the staff, thereby ensuring the convenience of operation of the staff when overhauling the device in the later stage. At the same time, by arranging the bolts in the middle position of two adjacent metal heat sinks 206, sufficient operating space is reserved for the disassembly and assembly of the bolts, avoiding the inconvenience caused by the existence of the metal heat sink 206 on the bolt disassembly operation;

[0064] When the device is working, the air duct 3 with an internal diameter that gradually decreases from bottom to top is installed above the air outlet 103, and the diffuser 301 with an internal diameter that gradually increases from bottom to top is installed at the middle position of the outer end wall of the air duct 3. With the help of the air duct 3 to converge the airflow, the airflow can be accelerated when it is ejected outward at the diffuser 301, thereby producing an air suction effect on the surrounding airflow, reducing the pressure inside the air outlet 103, reducing the probability of airflow backflow, and thus avoiding noise caused by airflow backflow. By fixing the sponge layer 303 on the inner end wall of the connection between the air duct 3 and the diffuser 301, the airflow in the backflow state can be effectively buffered, and the inner wall of the sponge layer 303 can be fixedly installed on the inner wall of the connection between the air duct 3 and the diffuser 301. The porous honeycomb structure is configured to enhance the buffering effect of the sponge layer 303 on the kinetic energy of the airflow to a certain extent. At the same time, the noise generated by the device during operation can be further reduced in combination with the honeycomb structure's absorption of noise, which is beneficial to ensuring the working stability of the device. By installing a cross-shaped guide plate 304 inside the air duct 3, the outlet of the air duct 3 can be divided into four independent spaces, which is beneficial to guiding and dividing the airflow passing through it, thereby reducing the probability of backflow and outlet vortex phenomena in the high-pressure airflow. At the same time, by configuring the bottom end of the guide plate 304 to be a blade structure, the flowing airflow can be effectively broken, further ensuring the working stability of the device.

[0065] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A double-volute centrifugal fan with an inlet air flow guiding structure, comprising a base (1), characterized in that: A volute (101) is fixedly mounted on the top of the base (1), and an air inlet (102) is provided on the front of the volute (101); an air outlet (103) arranged vertically upward is fixedly mounted at the top edge of the volute (101); an impeller (104) corresponding to the air inlet (102) is rotatably mounted inside the volute (101); a servo motor (105) arranged behind the volute (101) is fixedly mounted on the top of the base (1), and a drive shaft of the servo motor (105) is fixedly connected to the impeller (104); The front of the volute housing (101) is provided with a volute housing (2) corresponding to the air inlet (102), and the outer shape of the volute housing (2) is arranged as a truncated cone structure, and the middle position of the volute housing (2) is provided with an inner liner (201) of a conical structure, and the internal diameters of the volute housing (2) and the inner liner (201) are gradually reduced from front to back, and the front of the volute housing (2) and the inner liner (201) are fixedly connected by an annular cover (202), and an air inlet pipe (203) is fixedly connected at the outer edge position of the annular cover (202).

2. A double-volute centrifugal fan with an inlet airflow guiding structure according to claim 1, characterized in that: The air inlet pipe (203) is transversely arranged at the outer edge of the annular cover (202), and a filter screen (205) is fixedly installed at the port of the air inlet pipe (203).

3. A double-volute centrifugal fan with an inlet airflow guiding structure according to claim 1, characterized in that: A guide pipe (204) with a spiral structure is fixedly installed in the cavity formed between the second volute (2), the liner (201) and the annular cover (202); one end of the guide pipe (204) is fixedly inserted into the interior of the air inlet pipe (203); and the other end of the guide pipe (204) is correspondingly connected to the air inlet (102).

4. A double-volute centrifugal fan with an inlet airflow guiding structure as claimed in claim 3, characterized in that: The inner diameter of the guide tube (204) gradually decreases from front to back.

5. A double-volute centrifugal fan with an inlet airflow guiding structure according to claim 1, characterized in that: A plurality of longitudinally arranged metal heat sinks (206) are evenly and fixedly arranged on the outer end wall of the second volute (2), and the appearance of the plurality of metal heat sinks (206) is a thin sheet structure.

6. A double-volute centrifugal fan with an inlet airflow guiding structure as claimed in claim 5, characterized in that: The outer shape of part of the metal heat sink (206) is set to an L-shaped structure, and the back end of part of the metal heat sink (206) is in contact with the front side of the turbine housing (101), and a silicone pad (207) is sandwiched between the metal heat sink (206) and the turbine housing (101).

7. A double-volute centrifugal fan with an inlet airflow guiding structure according to claim 6, characterized in that: The second volute (2) is fixedly mounted on the front outer end wall of the first volute (101) by means of bolts, wherein the bolts are mounted at the middle position of two adjacent metal heat sinks (206).

8. A double-volute centrifugal fan with an inlet airflow guiding structure according to claim 1, characterized in that: A funnel-shaped air duct (3) is fixedly installed on the top of the air outlet (103), and the internal diameter of the air duct (3) gradually decreases from bottom to top. A funnel-shaped diffuser (301) is fixedly installed at the middle position of the outer end wall of the air duct (3), and the internal diameter of the diffuser (301) gradually increases from bottom to top. The top of the diffuser (301) is fixedly connected to a through pipe (302).

9. A double-volute centrifugal fan with an inlet airflow guiding structure as claimed in claim 8, characterized in that: A sponge layer (303) is fixedly mounted on the inner end wall of the connection between the air guide pipe (3) and the diffuser cover (301), and the interior of the sponge layer (303) is arranged as a porous honeycomb structure.

10. A double-volute centrifugal fan with an inlet airflow guiding structure according to claim 8, characterized in that: A flow guide plate (304) with a cross-shaped structure is fixedly installed inside the air guide pipe (3), and the bottom end of the flow guide plate (304) is arranged as a blade structure.

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