High-efficiency explosion-proof fan impeller

Abstract

The utility model provides a high-efficiency explosion-proof fan impeller, and belongs to the technical field of fan impellers. The high-efficiency anti-explosion fan impeller comprises an impeller disc and impeller blades arranged on the outer edge of the impeller disc in the circumferential direction at equal intervals. The impeller blades are bent blades which are obliquely arranged, that is, the impeller blades are arranged at a bending angle alpha, a deviation angle beta exists between the impeller blades and the axial direction of the impeller disc, the side, facing the pump bottom air inlet, of each impeller blade is a wind receiving face, the opposite side is a leeward face, and one end of the outer edge of each blade extends towards the two sides to form an extension part; the impeller disc sequentially comprises a blade connecting ring, a bearing positioning ring and a central shaft hole from outside to inside, and extending structure ribs and weight reduction grooves are formed in the impeller disc between the blade connecting ring and the bearing positioning ring at intervals in the radiation direction. The utility model has the advantages that the efficiency of the impeller is further improved, and the fan obtains higher working efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of fan impellers, and in particular relates to a high-efficiency explosion-proof fan impeller. Background Art

[0002] A vortex blower is a dual-purpose ventilation air source. Its operating principle relies on an impeller that compresses gas and creates a circulating airflow. The impeller is composed of dozens of blades. Air between the impeller blades is subjected to centrifugal force and moves toward the impeller's edge. There, the air enters the annular cavity of the pump body and circulates again from the starting point of the blades in the same manner. The circulating airflow generated by the impeller's rotation leaves the air pump with extremely high energy for use.

[0003] The efficiency of the impeller directly affects the overall efficiency of the fan. Under conventional technology, the impeller blades of the fan are usually straight blades, and the blade direction is consistent with the axial direction of the impeller disk. The blades of this structure are usually less efficient. Patent application number CN201120269882.3 discloses a high-efficiency forward-inclined impeller for a double-sided fan, which sets the straight blades to curved blades with a bending angle of 6°, thereby increasing the impeller efficiency by 10%. However, as the application of fans becomes more and more widespread, there is still a need to design a more efficient impeller structure. Utility Model Content

[0004] The purpose of the utility model is to provide a high-efficiency explosion-proof fan impeller in response to the above-mentioned problems existing in the prior art.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a high-efficiency explosion-proof fan impeller, comprising an impeller disk and impeller blades equidistantly arranged at the outer edge of the impeller disk in the circumferential direction, the fan impeller is installed in the pump head of the explosion-proof fan, the external air flows in from the air inlet at the bottom of the pump where the air inlet duct is connected to the pump bottom, flows through the impeller cavity of the pump head under the action of the impeller, and then flows out from the air outlet at the bottom of the pump where the air outlet duct is connected to the pump bottom;

[0006] The impeller blades are obliquely arranged curved blades, that is, the impeller blades are set at a bending angle α and are offset at an angle β with the axial direction of the impeller disk. The oblique direction gradually deviates downward from front to back, so that the side facing the air inlet at the bottom of the pump forms a wind-receiving side, and the opposite side forms a leeward side. The impeller blades extend to both sides at one end of the outer edge of the blade radiating outward to form an extension portion;

[0007] The impeller disk includes a blade connecting ring, a bearing positioning ring and a central shaft hole from the outside to the inside. The blade connecting ring is formed with a raised connecting skeleton at the middle section. Extended structural ribs are formed along the radial direction on the impeller disk between the blade connecting ring and the bearing positioning ring, and weight-reducing grooves are opened between adjacent extended structural ribs.

[0008] In the above-mentioned high-efficiency explosion-proof fan impeller, the impeller disc and impeller blades are of integrated design and are made of aluminum alloy as a whole, so that they meet the use requirements of explosion-proof fans.

[0009] In the above-mentioned high-efficiency explosion-proof fan impeller, the bending angle α of the impeller blades is between 5° and 8°, and the offset angle β is between 15° and 35°.

[0010] In the above-mentioned high-efficiency explosion-proof fan impeller, the distance d between adjacent impeller blades in the circumferential direction of the outer edge of the impeller disk is between 1.85 mm and 2.00 mm.

[0011] In the above-mentioned high-efficiency explosion-proof fan impeller, a shaft hole keyway is provided on the hole wall of the central shaft hole.

[0012] Compared with the prior art, the high-efficiency explosion-proof fan impeller provided by the utility model further improves the impeller efficiency by designing the impeller blades as obliquely arranged curved blades, so that the fan achieves higher working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the installation diagram of the high-efficiency explosion-proof fan impeller;

[0014] Figure 2 This is a schematic diagram of the overall structure of the high-efficiency explosion-proof fan impeller;

[0015] Figure 3 This is a side structural diagram of the high-efficiency explosion-proof fan impeller;

[0016] In the above figure, 100, impeller blade; 110, windward side; 120, leeward side; 130, extension; 200, impeller disk; 210, blade connecting ring; 211, connecting skeleton; 221, extended structural rib; 222, weight-reducing groove; 230, bearing locating ring; 240, center shaft hole; 241, shaft hole keyway; 310, pump bottom air inlet; 320, pump bottom air outlet. DETAILED DESCRIPTION

[0017] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0018] like Figures 1 to 3As shown, the impeller of the explosion-proof blower is installed in the pump head of the explosion-proof blower. The external air flows in through the pump bottom air inlet 310 where the air inlet duct connects to the pump bottom. Under the action of the impeller, it flows through the impeller cavity of the pump head and then flows out through the pump bottom air outlet 320 where the air outlet duct connects to the pump bottom. This high-efficiency explosion-proof blower impeller includes an impeller disc 200 and impeller blades 100 arranged at equal distances around the outer edge of the impeller disc 200. The working shaft of the explosion-proof motor drives the impeller disc 200 to rotate, causing the outer impeller blades 100 to move circumferentially, conveying the airflow within the impeller cavity.

[0019] like Figure 2 As shown, the impeller disk 200 includes, from the outside to the inside, a blade connecting ring 210, a bearing locating ring 230, and a central shaft hole 240. The blade connecting ring 210 has an arc-shaped protruding connecting frame 211 formed in the middle section of the side wall. The connecting frame 211 connects all the impeller blades 100 on the outer edge of the impeller disk 200 in series, so that the pressure exerted on the impeller blades 100 when receiving wind and delivering air can be transmitted to the impeller disk 200 through the connecting frame 211, thereby improving the strength of the impeller blades 100. Extended structural ribs 221 are formed radially on the impeller disc 200 between the blade connecting ring 210 and the bearing locating ring 230. The extended structural ribs 221 follow the inclination and curvature of the impeller blades 100, thereby better absorbing the pressure transmitted from the impeller blades 100 to the impeller disc 200 and improving its aesthetics. Weight-reducing grooves 222 are provided between adjacent extended structural ribs 221. While ensuring the overall strength of the impeller disc 200, the weight-reducing grooves 222 are used to reduce the overall weight of the impeller, save production materials, and lower production costs. A shaft keyway 241 is provided on the wall of the central shaft hole 240 to facilitate the installation and positioning of the working shaft of the explosion-proof motor.

[0020] like Figure 3 As shown, the impeller blade 100 is set as an obliquely set curved blade, that is, the impeller blade 100 is not only provided with a bending angle α, the bending angle α is between 5° and 8°, so as to improve the flow efficiency of the impeller blade 100 and the performance of the fan; and the setting direction of the impeller blade 100 is offset from the axial direction of the impeller disk 200 at an angle β, and the offset oblique direction gradually offsets downward from front to back, so that the side of the impeller blade 100 facing the pump bottom air inlet 310 forms a wind-receiving surface 110, and the opposite side is the leeward side 120. The airflow flows into the pump bottom air inlet 310 and impacts the wind-receiving surface 110 of the impeller blade 100, and is sent into the impeller cavity for circulation by the wind-receiving surface 110, and finally outputs high-energy airflow from the pump bottom air outlet 320. The offset angle β of the impeller blade 100 is between 15° and 35°, so as to better circulate and supply air.

[0021] Impeller blades 100 have extensions 130 extending from one end of the outer edge of the blade radiating outward. Extensions 130 extend axially beyond the outer edges of the impeller disk 200. Since air within impeller blades 100 is subject to centrifugal force and moves toward the edges of the impeller, the airflow energy at the edges of impeller blades 100 is higher. Therefore, providing extensions 130 can increase the wind-receiving surface 110 of impeller blades 100, thereby improving its airflow efficiency. The spacing d between adjacent impeller blades 100 circumferentially around the outer edge of the impeller disk 200 is between 1.85 mm and 2.00 mm. A spacing d that is too large can easily result in insufficient fan pressure, while a spacing d that is too small can easily cause the impeller to jam. Therefore, a spacing within this range is more suitable.

[0022] It is further explained that the impeller disc 200 and the impeller blades 100 are of integrated design, precise and strong, and are made entirely of aluminum alloy. They are not easy to break, are resistant to knocks, fire and corrosion, and meet the use requirements of explosion-proof fans and are suitable for their use environment.

[0023] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0024] Although various terms are used in this document, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A high-efficiency explosion-proof fan impeller, comprising an impeller disc (200) and impeller blades (100) equidistantly arranged on the outer edge of the impeller disc (200), wherein the fan impeller is installed in a pump head of the explosion-proof fan, wherein external air flows in from an air inlet (310) at the pump bottom where an air inlet duct connects to the pump bottom, flows through an impeller cavity of the pump head under the action of the impeller, and then flows out from an air outlet (320) at the pump bottom where an air outlet duct connects to the pump bottom; It is characterized by: The impeller blade (100) is an obliquely arranged curved blade, that is, the impeller blade (100) is set at a bending angle α and has an offset angle β with the axial direction of the impeller disk (200), and its oblique direction gradually deviates downward from front to back, so that the side facing the pump bottom air inlet (310) forms a wind-receiving surface (110), and the opposite side forms a leeward surface (120), and the impeller blade (100) extends to both sides at one end of the blade outer edge radiating outward to form an extension portion (130); The impeller disk (200) comprises, from outside to inside, a blade connecting ring (210), a bearing positioning ring (230) and a central shaft hole (240); a protruding connecting skeleton (211) is formed at the middle section of the blade connecting ring (210); extended structural ribs (221) are formed along a radial direction on the impeller disk (200) between the blade connecting ring (210) and the bearing positioning ring (230); and weight-reducing grooves (222) are provided between adjacent extended structural ribs (221).

2. A high-efficiency explosion-proof fan impeller according to claim 1, characterized in that: The impeller disc (200) and the impeller blades (100) are of an integrated design and are made entirely of aluminum alloy.

3. A high-efficiency explosion-proof fan impeller according to claim 1, characterized in that: The impeller blade (100) has a bending angle α between 5° and 8°, and a deviation angle β between 15° and 35°.

4. A high-efficiency explosion-proof fan impeller according to claim 1, characterized in that: The distance d between adjacent impeller blades (100) in the circumferential direction of the outer edge of the impeller disk (200) is between 1.85 mm and 2.00 mm.

5. The high-efficiency explosion-proof fan impeller according to claim 1, characterized in that: An axis hole keyway (241) is provided on the hole wall of the central axis hole (240).

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