Energy-saving explosion-proof centrifugal fan

Abstract

The application discloses an energy-saving explosion-proof centrifugal fan, and relates to the technical field of centrifugal fans, comprising an impeller and blades, wherein a liquid collecting convex structure is arranged on the blades; the liquid collecting convex structure comprises two fourth convex structures, two third convex structures, two second convex structures and two first convex structures arranged in sequence from the central position of the impeller to the outer edge of the impeller; the scheme can reconvert atomized cleaning liquid into large-volume droplets in the centrifugal fan, the large-volume droplets are affected by centrifugal force and separated from the blades following the wind force, can impact on the inner wall of the cladding plate at high speed, and realize the self-cleaning function of the inner wall of the cladding plate; the scheme utilizes the wind force to carry the mist droplets, and then collects the mist droplets into droplets, can comprehensively clean the centrifugal fan, has no complex spare parts to be added or modified, is easy to produce, and is a centrifugal fan technical improvement meeting market demands, and the energy-saving explosion-proof mode is simple and good in effect.

Description

An energy-saving explosion-proof centrifugal fan Technical Field

[0001] This invention relates to the field of centrifugal fan technology, specifically an energy-saving explosion-proof centrifugal fan. Background Technology

[0002] Centrifugal fans are machines that use input mechanical energy to increase gas pressure and discharge gas. They are widely used in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings for ventilation, dust removal, and cooling; in boilers and industrial furnaces for ventilation and induced draft; and in air conditioning equipment and household appliances for cooling and ventilation. With continuous technological advancements, the application areas of centrifugal fans are becoming increasingly broad. However, when used in factories, mines, and tunnels, the high dust density in the ambient air leads to dust accumulation on the internal components of the centrifugal fan. This not only reduces operating efficiency but also increases energy consumption. In severe cases, it can even cause overheating, noise, and impeller aberration, affecting the fan's lifespan and increasing energy consumption. Especially in locations with high safety requirements, such as mines, centrifugal fan malfunctions can lead to serious safety accidents.

[0003] Chinese utility model patent CN216894954U discloses a centrifugal fan with an external heat dissipation structure motor. The design includes a centrifugal fan body, an external heat dissipation structure housing placed below the fan body's support, a water tank inside the housing, a water pump fixedly mounted on the surface of the water tank, and a water injection pipe fixedly connected to one side of the tank. One end of the water injection pipe is detachably connected to a water injection pipe sealing plug, and the sealing plug contains a first baffle and a second baffle. A push rod is inserted between the first and second baffles. This external heat dissipation structure achieves heat dissipation for the centrifugal fan, resulting in energy savings.

[0004] Chinese utility model patent with authorization announcement number CN220302356U: An energy-saving centrifugal fan, which discloses a base, on which a fan housing is fixedly installed, an air outlet is fixedly provided on one side of the fan housing, and air inlets are fixedly provided at both ends of the fan housing. The centrifugal fan is provided with two vortex fans, and the two vortex fans are driven by a drive motor to rotate and exhaust air, which is more efficient than the traditional single-sided air inlet, so as to achieve energy saving effect.

[0005] Chinese invention patent CN115977972A discloses a flow-guiding and pressurizing energy-saving centrifugal fan, which includes a workbench. A centrifugal cylinder is fixedly installed on the upper surface of the workbench. An air outlet is provided on one side of the centrifugal cylinder. A sealing component is provided on the air outlet. A servo motor is fixedly installed on the upper surface of the workbench. An installation plate is installed on the output of the servo motor. Several impellers are rotatably installed on the surface of the installation plate through a rotating shaft. An adjustment and positioning component is provided on the installation plate. The invention allows the operator to pull the plate upwards, causing the bottom end of the fixed column to emerge from the fixed hole, thereby driving the installation ring to rotate. This, in turn, drives several gears to rotate, which in turn drives several rotating shafts to rotate, thereby driving several impellers to rotate. The angle of the impellers can be adjusted to adjust the pressure of the device, making the gas in the device accelerate faster, thus achieving an energy-saving effect.

[0006] The aforementioned patents achieve energy-saving functions for centrifugal fans by means of external heat dissipation structures, adding turbo fans, and adding drive shafts. Although the above technical solutions can achieve energy-saving effects, they all rely on adding a large number of auxiliary structures to the existing centrifugal fan structure to achieve energy saving. This results in technical problems such as high manufacturing costs, poor market adaptability, and poor practicality. Therefore, there is an urgent need in this field for an energy-saving explosion-proof centrifugal fan to solve the problems existing in the prior art. Summary of the Invention

[0007] The purpose of this invention is to provide an energy-saving explosion-proof centrifugal fan technical solution to solve the technical problem of poor energy-saving and explosion-proof performance of existing centrifugal fans.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an energy-saving explosion-proof centrifugal fan, comprising a volute, an impeller installed inside the volute, and a motor installed on one side of the volute. The motor is connected to the impeller via a drive. The impeller comprises two parallel mounting plates and a plurality of blades fixedly connected in a ring array between the two mounting plates. An air inlet is provided in the center of one of the mounting plates. At least two rows of liquid-collecting convex structures are arranged in a linear array on the leeward side of the blades. From the center of the impeller towards the outer edge of the impeller, the liquid-collecting convex structures include two fourth convex patterns, two third convex patterns, two second convex patterns, and two first convex patterns arranged sequentially. A virtual plane parallel to the straight sidewall of the mounting plate is used as the mirror surface of the convex patterns. The two fourth convex patterns are mirror-distributed, as are the two third convex patterns, the two second convex patterns, and the two first convex patterns. The angle between the fourth convex pattern and the mirror surface of the convex patterns is less than the angle between the third convex pattern and the mirror surface of the convex patterns, which is less than the angle between the second convex pattern and the mirror surface of the convex patterns, which is less than the angle between the first convex pattern and the mirror surface of the convex patterns.

[0009] An external atomizer is installed on the side of the centrifugal fan near the air inlet, with the exhaust port of the external atomizer facing the direction of the air inlet.

[0010] Using the above technical solution, the external atomizer atomizes the cleaning fluid and sprays it towards the area near the air inlet. With the air inlet as the viewing direction, under normal operating conditions, the centrifugal fan's impeller rotates clockwise, generating airflow at the exhaust port. When self-cleaning is required, the motor controls the impeller to rotate counter-clockwise. At this time, the leeward side of the blades becomes the windward side in the self-cleaning state. Air near the air inlet and the mist provided by the atomizer are drawn into the centrifugal fan by negative pressure. During this process, the mist droplets flow efficiently through and adhere to the windward side in the self-cleaning state. Then, under the action of centrifugal force, the droplets flow and converge towards the outer edge of the blades. During this flow and convergence, the droplets are guided by the linear trajectory of the liquid-collecting textured structure. Ultimately, large droplets tend to gather at the end of the first ridge furthest from the fourth ridge, forming a large volume droplet. Without the guidance of the collecting ridge structure, the droplets would only form small volume droplets on the blade surface under the action of centrifugal force. Then, the large volume droplets continue to be affected by centrifugal force and detach from the blade with the wind. Since the mass of the droplets is much greater than that of air, the droplets can impact the inner wall of the cladding plate at high speed after detaching from the blade. The inner wall of the cladding plate achieves a rinsing function and a self-cleaning function through the continuous impact of droplets. During the above self-cleaning process, since the space around the blade maintains high humidity and the blade rotates at high speed, the dust accumulated on the blade can be effectively dissolved and detached from the blade surface by centrifugal force, thus achieving the self-cleaning function of the blade surface.

[0011] Under the action of centrifugal force, the dense mist droplets on the blade merge into liquid droplets, and can form a liquid droplet flow coverage surface on the blade surface.

[0012] As a preferred embodiment, the volute includes a cover plate and side plates fixed to both ends of the cover plate, wherein a turbulence groove is horizontally opened through the side plates; and a sealing block is installed inside the turbulence groove in a detachable manner.

[0013] Using the above technical solution, the wind flowing along the wind direction trajectory inside the volute can escape from the volute near the turbulence groove area. Guided by the wind force escaping out of the volute, the wind near the side plate area tends to be guided and blown towards the inner wall of the side plate, allowing the droplets carried in the wind to wash the side plate and achieve the self-cleaning function of the side plate. This solution can effectively self-clean the internal structure of the centrifugal fan by wind force guidance. The simple blade structure can re-aggregate the atomized cleaning liquid into large-volume droplets, which can effectively clean the blades, the cover plate, and the side plate, avoiding the accumulation of dust that causes overheating of centrifugal fan components and impeller polarization. It can effectively maintain the stability of fan operation and has energy-saving and explosion-proof effects.

[0014] As a preferred embodiment, the end face of the sealing block near the inner wall of the side plate is flush with the inner wall of the side plate, so that the sealing block will not cause resistance to the airflow when the centrifugal fan is in normal use.

[0015] As a preferred embodiment, a connecting plate is fixedly connected to one end of the sealing block near the outer side wall of the side plate, and the connecting plate is detachably fixed to the side plate; as a preferred embodiment, the connecting plate is fixed to the side plate using bolts; under normal use of the centrifugal fan, the sealing block fills the turbulence groove, and the connecting plate is fixed to the side plate. When the centrifugal fan needs to be self-cleaned, the connecting plate and the sealing block are removed from the side plate together, so that the turbulence groove is exposed to the air, thereby enabling the centrifugal fan to self-clean.

[0016] As a preferred embodiment, the top of the covering plate is provided with a pressure relief groove, and a sealing cover is sealed and installed on the pressure relief groove. Under normal operating conditions of the centrifugal fan, the sealing cover is in a sealed installation state. When the centrifugal fan needs to be self-cleaned, the sealing cover is removed, exposing the pressure relief groove to the air. Since the inside of the volute is a volute structure, and the impeller needs to be reversed during self-cleaning, the presence of the pressure relief groove can prevent the reverse flow of air from impacting and damaging the volute tongue. At the same time, the pressure relief groove can also serve as a drain outlet, serving as a channel for the discharge of turbid liquid after self-cleaning.

[0017] As a preferred option, the turbulence grooves located on the two side plates are staggered, which can improve the effect of guiding the airflow towards the side plates.

[0018] As a preferred embodiment, a rubber ring is fixedly attached to the side wall of the sealing block, which can enhance the sealing effect of the sealing block on the turbulence groove.

[0019] As a preferred embodiment, the blades are backward-curved blades, which can reduce the noise during the operation of the centrifugal fan. At the same time, during self-cleaning, the impeller reverses its direction, and the blades can rotate in the shape of forward-curved blades, which can collect droplets more efficiently.

[0020] As a preferred embodiment, the blade has three rows of liquid collecting ridges arranged in a linear array on its leeward side.

[0021] As a preferred embodiment, the first, second, third, and fourth ridges all protrude 0.3-1.5 mm beyond the leeward side of the blade, ensuring the effective collection of fog droplets while avoiding excessive protrusion that could lead to damage.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. This solution can convert the atomized cleaning liquid back into large-volume droplets inside the centrifugal fan. The large-volume droplets are affected by centrifugal force and follow the wind to detach from the blades, and can impact the inner wall of the coating plate at high speed, thus realizing the self-cleaning function of the inner wall of the coating plate.

[0024] 2. During the self-cleaning process, due to the continuous high humidity in the space around the blades and the continuous high-speed rotation of the blades, the dust accumulated on the blades can be effectively dissolved and removed from the blade surface by centrifugal force, thus realizing the self-cleaning function of the blade surface.

[0025] 3. During the self-cleaning process, the wind near the turbulence channel can escape from the volute. Under the guidance of the wind force escaping out of the volute, the wind near the side plate area tends to blow towards the inner wall of the side plate, so that the droplets carried in the wind can wash the side plate and realize the self-cleaning function of the side plate.

[0026] 4. This solution utilizes wind power to carry mist droplets, which are then collected into liquid droplets, enabling comprehensive self-cleaning of the centrifugal fan's interior. It requires no complex parts additions or modifications, is easy to manufacture, and represents a technological improvement for centrifugal fans that meets market demands. The energy-saving and explosion-proof method is simple and effective. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the overall structure of the energy-saving explosion-proof centrifugal fan of the present invention from a front oblique view.

[0028] Figure 2 is a rearward oblique view of the overall structure of the energy-saving explosion-proof centrifugal fan of the present invention;

[0029] Figure 3 is a schematic diagram of the volute structure of the energy-saving explosion-proof centrifugal fan of the present invention;

[0030] Figure 4 is a schematic diagram of the impeller structure of the energy-saving explosion-proof centrifugal fan of the present invention;

[0031] Figure 5 is a schematic diagram of the blade structure of the energy-saving explosion-proof centrifugal fan of the present invention;

[0032] Figure 6 is a front view of the blades of the energy-saving explosion-proof centrifugal fan of the present invention from the leeward side.

[0033] Figure 7 is a schematic diagram of the sealing block and connecting plate structure of the energy-saving explosion-proof centrifugal fan of the present invention;

[0034] Figure 8 is a schematic diagram simulating the overlap of the leeward surface of the blades and the droplet flow coverage surface of the energy-saving explosion-proof centrifugal fan of the present invention.

[0035] Figure 9 is a schematic diagram of the structure after being cut along the irregular section A in Figure 3;

[0036] Figure 10 is a top view of Figure 9 in the self-cleaning state of the centrifugal fan.

[0037] The diagram is labeled as follows: 101, volute; 102, impeller; 103, motor; 111, covering plate; 112, side plate; 113, turbulence groove; 114, sealing block; 115, connecting plate; 116, pressure relief groove; 117, sealing cover plate; 201, mounting plate; 202, blade; 203, air inlet; 204, liquid collection embossed structure; 301, first embossed pattern; 302, second embossed pattern; 303, third embossed pattern; 304, fourth embossed pattern; 305, embossed pattern mirror image; 306, droplet flow coverage surface; 307, wind direction trajectory. Detailed Implementation

[0038] 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.

[0039] Example: As shown in Figures 1-10, the present invention provides an energy-saving explosion-proof centrifugal fan, including a volute 101, an impeller 102 installed inside the volute 101, and a motor 103 installed on one side of the volute 101. The motor 103 is connected to the impeller 102 for transmission. The impeller 102 includes two parallel mounting plates 201 and a plurality of blades 202 fixedly connected in a ring array between the two mounting plates 201. An air inlet 203 is provided in the center of one mounting plate 201. Three rows of liquid collecting embossed structures 204 are arranged in a linear array on the leeward side of the blades 202. From the center of the impeller 102 towards the outer edge of the impeller 102, the liquid collecting embossed structures 204 include two fourth embossed patterns 304, two third embossed patterns 303, two second embossed patterns 302, and two first embossed patterns 301 arranged in sequence; parallel to the... The virtual plane of the straight sidewall of the mounting plate 201 serves as the convex texture mirror surface 305. Two fourth convex textures 304, two third convex textures 303, two second convex textures 302, and two first convex textures 301 are mirrored. The angle between the fourth convex texture 304 and the convex texture mirror surface 305 is less than the angle between the third convex texture 303 and the convex texture mirror surface 305, which is less than the angle between the second convex texture 302 and the convex texture mirror surface 305, which is less than the angle between the first convex texture 301 and the convex texture mirror surface 305. As shown in Figure 8, the liquid collecting convex texture structure 204 presents an overall rhomboid structure, which allows adjacent liquid collecting convex texture structures 204 to effectively guide all droplets without needing to be closely arranged. This not only saves the manufacturing cost of the blade 202 but also facilitates the production of blades 202 of the same quality, avoiding the generation of polarization phenomena.

[0040] An external atomizer is installed on the side of the centrifugal fan near the air inlet 203, with the exhaust port of the external atomizer facing the direction of the air inlet 203.

[0041] Using the above technical solution, the external atomizer atomizes the cleaning liquid and sprays it towards the area near the air inlet 203. With the air inlet 203 as the direct view, under normal operating conditions, the impeller 102 of the centrifugal fan rotates clockwise, generating airflow at the exhaust port. When self-cleaning of the centrifugal fan is required, the motor 103 controls the impeller 102 to rotate counterclockwise. At this time, the leeward side of the blades 202 becomes the windward side in the self-cleaning state. The air near the air inlet 203 and the mist provided by the atomizer are drawn into the centrifugal fan by negative pressure. During this process, the mist droplets flow efficiently through and adhere to the windward side in the self-cleaning state. Then, under the action of centrifugal force, the droplets flow and converge towards the outer edge of the blades 202. During this flow and convergence, the droplets are guided by the linear trajectory of the liquid-collecting textured structure 204, ultimately facilitating the first convex... The end of the ridge 301 furthest from the fourth ridge 304 collects to form a large-volume droplet. Without the guidance of the collecting ridge structure 204, the droplets, under the action of centrifugal force, can only form small-volume droplets on the surface of the blade 202. Then, the large-volume droplets continue to be affected by centrifugal force and are carried away from the blade 202 by the wind. Since the mass of the droplets is much greater than that of air, the droplets can impact the inner wall of the covering plate 111 at high speed after leaving the blade 202. The inner wall of the covering plate 111 is washed by the continuous impact of droplets, thus achieving the self-cleaning function of the inner wall of the covering plate 111. During the above self-cleaning process, since the space around the blade 202 maintains high humidity and the blade 202 continues to rotate at high speed, the dust accumulated on the blade 202 can be effectively dissolved and removed from the surface of the blade 202 by centrifugal force, thus achieving the self-cleaning function of the surface of the blade 202.

[0042] Under the action of centrifugal force, the dense mist droplets of the blade 202 merge into droplets and form a droplet flow coverage surface 306 on the surface of the blade 202, as shown in Figure 8. The non-densely distributed liquid collecting ridge structure 204 can coincide with any droplet trajectory on the droplet flow coverage surface 306, which can ensure that the droplets can be guided by the liquid collecting ridge structure 204 with high efficiency and finally converge into a large volume droplet.

[0043] The volute 101 includes a cover plate 111 and side plates 112 fixed to both ends of the cover plate 111. A turbulence groove 113 is horizontally opened through the side plate 112. A sealing block 114 is installed inside the turbulence groove 113 in a detachable manner.

[0044] As shown in Figure 10, the wind flowing along the wind direction trajectory 307 inside the volute 101, near the area of ​​the turbulence channel 113, can escape from the volute 101 through the turbulence channel 113. Under the guidance of the wind force escaping from the volute 101, the wind near the area of ​​the side plate 112 tends to be guided and blown towards the inner wall of the side plate 112, so that the droplets carried in the wind can wash the side plate 112, realizing the self-cleaning function of the side plate 112. This solution can effectively self-clean the internal structure of the centrifugal fan by wind force guidance. Using a simple blade structure, the atomized cleaning liquid is re-aggregated into large-volume droplets, which can effectively clean the blades 202, the covering plate 111, and the side plate 112, avoiding the accumulation of dust that causes overheating of centrifugal fan components and impeller polarization. It can effectively maintain the stability of fan operation and has energy-saving and explosion-proof effects.

[0045] The sealing block 114 is flush with the inner wall of the side plate 112 at one end, so that the sealing block 114 will not cause resistance to the airflow when the centrifugal fan is in normal use.

[0046] A connecting plate 115 is fixedly connected to one end of the sealing block 114 near the outer side wall of the side plate 112. The connecting plate 115 is fixed to the side plate 112 with bolts. Under normal operating conditions of the centrifugal fan, the sealing block 114 fills the turbulence groove 113, and the connecting plate 115 is fixed to the side plate 112. When the centrifugal fan needs to be self-cleaned, the connecting plate 115 and the sealing block 114 are removed from the side plate 112 together, so that the turbulence groove 113 is exposed to the air, thereby enabling the centrifugal fan to self-clean.

[0047] The top of the cover plate 111 is provided with a pressure relief groove 116, and a sealing cover plate 117 is sealed and installed on the pressure relief groove 116. Under normal use of the centrifugal fan, the sealing cover plate 117 is in a sealed installation state. When the centrifugal fan needs to be self-cleaned, the sealing cover plate 117 is removed, so that the pressure relief groove 116 is exposed to the air. Since the inside of the volute 101 is a volute structure, and the impeller 102 needs to be reversed during self-cleaning, the presence of the pressure relief groove 116 can prevent the reverse flow of air from impacting and damaging the volute tongue. At the same time, the pressure relief groove 116 can also serve as a drain outlet, serving as a channel for the discharge of turbid liquid after self-cleaning.

[0048] As shown in Figures 9 and 10, the turbulence grooves 113 located on the two side plates 112 are staggered, which can improve the effect of guiding the airflow towards the side plates 112 and improve the self-cleaning efficiency.

[0049] A rubber ring is fixedly attached to the side wall of the sealing block 114, which can enhance the sealing effect of the sealing block 114 on the turbulence groove 113.

[0050] Blade 202 is a backward-curved blade, which can reduce the noise when the centrifugal fan is in use. At the same time, during self-cleaning, the impeller 102 reverses, and blade 202 can rotate in the form of a forward-curved blade, which can collect droplets more efficiently.

[0051] The first ridge 301, the second ridge 302, the third ridge 303, and the fourth ridge 304 all protrude 0.8 mm beyond the leeward side of the blade 202. This ensures the effective collection of fog droplets while avoiding damage caused by excessive protrusion length.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An energy-saving explosion-proof centrifugal fan, comprising a volute (101), an impeller (102) installed inside the volute (101), and a motor (103) installed on one side of the volute (101), wherein the motor (103) is drivenly connected to the impeller (102), characterized in that: The impeller (102) includes two parallel mounting plates (201) and a plurality of blades (202) fixedly connected in a ring array between the two mounting plates (201). One mounting plate (201) has an air inlet (203) in its center. The blades (202) have at least two rows of liquid-collecting embossed structures (204) arranged in a linear array on their leeward surfaces. From the center of the impeller (102) towards its outer edge, the liquid-collecting embossed structures (204) include two fourth embossed patterns (304), two third embossed patterns (303), two second embossed patterns (302), and two first embossed patterns (301) arranged sequentially, parallel to the mounting plates (201). The virtual plane of the straight sidewall serves as the mirror surface of the convex pattern (305). Two fourth convex patterns (304) are mirrored, two third convex patterns (303) are mirrored, two second convex patterns (302) are mirrored, and two first convex patterns (301) are mirrored. The angle between the fourth convex pattern (304) and the mirror surface of the convex pattern (305) is less than the angle between the third convex pattern (303) and the mirror surface of the convex pattern (305) is less than the angle between the second convex pattern (302) and the mirror surface of the convex pattern (305) is less than the angle between the first convex pattern (301) and the mirror surface of the convex pattern (305). An external atomizer is installed on the side of the centrifugal fan near the air inlet (203), and the exhaust port of the external atomizer faces the direction of the air inlet (203).

2. The energy-saving explosion-proof centrifugal fan according to claim 1, characterized in that: The volute (101) includes a cover plate (111) and side plates (112) fixed to both ends of the cover plate (111). A turbulence groove (113) is horizontally opened through the side plate (112). A sealing block (114) is installed inside the turbulence groove (113) in a detachable manner.

3. The energy-saving explosion-proof centrifugal fan according to claim 2, characterized in that: The sealing block (114) is flush with the inner wall of the side plate (112) at one end face.

4. The energy-saving explosion-proof centrifugal fan according to claim 2, characterized in that: The sealing block (114) is fixedly connected to a connecting plate (115) at one end near the outer side wall of the side plate (112), and the connecting plate (115) is detachably fixed to the side plate (112).

5. The energy-saving explosion-proof centrifugal fan according to claim 2, characterized in that: The top of the covering plate (111) is provided with a pressure relief groove (116), and a sealing cover plate (117) is sealed on the pressure relief groove (116).

6. The energy-saving explosion-proof centrifugal fan according to claim 2, characterized in that: The turbulence grooves (113) located on the two side plates (112) are staggered.

7. The energy-saving explosion-proof centrifugal fan according to claim 2, characterized in that: A rubber ring is fixedly attached to the side wall of the sealing block (114).

8. The energy-saving explosion-proof centrifugal fan according to claim 1, characterized in that: The blade (202) is a backward-curved blade.

9. The energy-saving explosion-proof centrifugal fan according to claim 1, characterized in that: The blade (202) has three rows of liquid collecting convex structures (204) arranged in a linear array on the leeward side.

10. An energy-saving explosion-proof centrifugal fan according to claim 1, characterized in that: The first ridge (301), the second ridge (302), the third ridge (303), and the fourth ridge (304) all protrude 0.3-1.5 mm from the leeward side of the blade (202).

Images