Impeller for animal husbandry and negative pressure fan with impeller

Abstract

According to the impeller for animal husbandry, the sides, close to the inner hub, of the inner large blades are straight plate type blades, and the sides, close to the outer hub, of the inner large blades are bent and twisted type blades; the side, close to the outer hub, of each outer blade is a bent blade, and the side, away from the outer hub, of each outer blade is a straight-plate blade. The inner small blade and the outer blade are geometrically similar in structure; flow stabilizing holes are formed in the outer hub between the adjacent outer blades, and the center lines of the flow stabilizing holes are not collinear with the center of the impeller; the radius of the outer hub is R, the radius of the outer side of the bent and twisted part of the outer blade is R2, the radius of the inner side of the bent and twisted part of the inner large blade is R1, R2 = (1.3-1.5) R, and R1 = (0.6-0.9) R. Due to the fact that the impeller and the blade structure are improved, wind pressure is effectively improved, noise is effectively reduced, stability is effectively improved, surge is effectively reduced, and efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid machinery, in particular to an impeller for animal husbandry, and more particularly to a negative pressure fan having the impeller. Background Art

[0002] Livestock fans are axial flow fans designed for livestock and industrial ventilation. They achieve ventilation and cooling through the principle of negative pressure ventilation and are widely used in farms, factory workshops and other places. Existing livestock fans on the market usually have problems such as low wind pressure, high noise, poor stability, high surge, and low efficiency. As people's requirements for livestock fans increase, the efficiency transformation of livestock fans is becoming increasingly strong. The design of the fan's impeller and blades is directly related to the fan's efficiency index. Optimizing the layout of the fan's impeller and blades can also significantly improve the above-mentioned defects of the fan. It can be seen that it is very necessary to optimize the design of livestock fans.

[0003] Prior art CN113464471A discloses a livestock fan system, including a fan cylinder 1, a fan shaft 2 is arranged in the fan cylinder 1, a fixed shaft 11 is connected to the end of the fan shaft 2, a blade 3 is arranged on the fixed shaft 11, the front end of the blade 3 is sharp, the middle of the blade 3 is thick and the tail end is thin, and it is in the shape of a willow eyebrow, the blade 3 is made of carbon fiber material, a polytetrafluoroethylene coating is arranged on the blade 3, an angle adjustment mechanism 13 is arranged at the connection between the fixed shaft 11 and the blade 3, and an angle adjustment mechanism 13 is arranged on the fixed shaft 11. A transverse groove 14 and blades 3 are provided. A support frame 4 is provided on the wall of the wind tube 1. A support frame 4 is provided at the top and bottom of the wind tube 1 respectively. A support shaft 5 is connected to the support frame 4. An anti-return air butterfly 6 is installed on the support shaft 5. A mounting card 7 is provided on the anti-return air butterfly 6. The anti-return air butterfly 6 is installed on the support shaft 5 through the mounting card 7. A limit card 8 is connected to the bottom of the support shaft 5. The limit card 8 is connected to a card seat 9. The card seat 9 is provided on the wind tube 1. A mounting seat 10 is provided at the end of the wind tube 1. The use of an integrated wind chime can more effectively prevent rain from entering the inside of the fan. The butterfly valve is designed to be installed on an inclined surface, and the butterfly valve is dropped by its own weight. The installation part of the butterfly valve only needs to be fixed with a bent plate and round steel. It automatically opens when the motor is turned on, which greatly reduces the assembly time and processing costs, and further reduces the cost of fan products. The fan blades have better rigidity and are not prone to deformation. Even in this environment, the air volume attenuation is not obvious. In addition, the material is moisture-proof, corrosion-resistant, and aging-resistant, has a long service life, is light, and saves energy.

[0004] However, the above-mentioned impeller and blade structure has design limitations, and only involves the design of some simple impeller and guide vane structures, and does not fundamentally change the relevant structures. There are problems such as low wind pressure, high noise, poor stability, high surge, and low efficiency. Therefore, in response to these problems, the applicant proposes an impeller for livestock and a negative pressure fan having the impeller. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an impeller for animal husbandry and a negative pressure fan having the impeller.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An impeller for animal husbandry comprises an inner hub, inner large blades, inner small blades, an outer hub and outer blades, wherein the inner large blades and the inner small blades are alternately and evenly arranged on the outer ring of the inner hub, the inner ring of the outer hub is fixed to the blade tip of the inner large blade, and the outer blades are evenly arranged on the outer ring of the outer hub, and the characteristic is that the inner large blades, the inner small blades and the outer blades are all composite blades; the inner large blades are straight blades on the side close to the inner hub, and are bent and twisted blades on the side close to the outer hub; the outer blades are bent and twisted blades on the side close to the outer hub, and are straight blades on the side away from the outer hub; the inner small blades are geometrically similar in structure to the outer blades; the outer hub between adjacent outer blades is provided with a steady flow hole, and the center line of the steady flow hole is not colinear with the center of the impeller; the radius of the outer hub is R, the outer radius of the bent and twisted part of the outer blade is R2, and the inner radius of the bent and twisted part of the inner large blade is R1, wherein R2=(1.3-1.5)R, and R1=(0.6-0.9)R.

[0008] Furthermore, the angle formed by the center line of the flow stabilizing hole and the radius line at the position is A, wherein A=10° to 60°.

[0009] Furthermore, the tip radius of the inner bladelet is R3, where R3=(0.3-0.6)R.

[0010] Furthermore, the flow stabilizing holes are located closer to the trailing edge side of the outer blade.

[0011] Furthermore, the chord length corresponding to the outer side of the outer blade bending and twisting portion is L1, and the chord length corresponding to the inner side of the inner large blade bending and twisting portion is L2, wherein L1>L2, and L1=(1.1-1.3)L2.

[0012] Furthermore, the surface of the impeller is covered with a wear-resistant and corrosion-resistant composite film.

[0013] Furthermore, the composite membrane is made of glass fiber reinforced plastic material.

[0014] A negative pressure fan, characterized in that the fan includes a guide ring, a motor, a motor bracket and a shaft sealing structure, the impeller is fixed to the end of the motor, the motor is installed inside the guide ring through the motor bracket, the impeller and the shaft are sealed with a sealing structure, and the impeller is the livestock impeller.

[0015] Furthermore, the sealing structure is an oil sealing structure using a sealing ring and an outer cover.

[0016] Furthermore, the motor bracket has a "T"-shaped structure.

[0017] Furthermore, a flow guiding structure is arranged on the inner wall of the flow guiding ring along the flow path direction, and a cross-sectional curve formed after the radial cross section of the flow guiding structure is expanded is a sine curve or a cosine curve.

[0018] Furthermore, the axial length of the impeller is W1, the inlet end of the guide structure coincides with the front end of the radial projection of the impeller on the inner wall of the guide ring, and the axial length of the guide structure is W2, wherein W2=(0.3-0.8)W1.

[0019] The present invention discloses an impeller for animal husbandry, which comprises an inner hub, inner large blades, inner small blades, an outer hub and outer blades. The inner large blades and the inner small blades are alternately and evenly arranged on the outer ring of the inner hub, the inner ring of the outer hub is fixed to the blade tip of the inner large blade, and the outer blades are evenly arranged on the outer ring of the outer hub. The inner large blades, the inner small blades and the outer blades are all composite blades; the inner large blades are straight blades on the side close to the inner hub, and bent and twisted blades on the side close to the outer hub; the outer blades are bent and twisted blades on the side close to the outer hub, and straight blades on the side away from the outer hub; the inner small blades are geometrically similar in structure to the outer blades; the outer hub between adjacent outer blades is provided with flow stabilizing holes, and the center line of the flow stabilizing holes is not colinear with the center of the impeller; the radius of the outer hub is R, the outer radius of the bent and twisted part of the outer blade is R2, and the inner radius of the bent and twisted part of the inner large blade is R1, wherein R2=(1.3-1.5)R, and R1=(0.6-0.9)R. Due to the improvement of the impeller and blade structure, the wind pressure is effectively increased, the noise is reduced, the stability is improved, the surge is reduced, and the efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural explosion diagram of the present invention;

[0021] Figure 2 It is an axial structural cross-sectional view of the present invention;

[0022] Figure 3 It is a schematic diagram of the radial cross section of the flow-guiding structure;

[0023] Figure 4 is a schematic diagram of the impeller structure;

[0024] Figure 5 Schematic diagram of relative size structure of impeller

[0025] In the figure: inner hub 1, inner large blade 2, inner small blade 3, outer hub 4, outer blade 5, flow stabilizing hole 6, guide ring 7, motor 8, motor bracket 9, guide structure 10, radius R of outer hub 4, outer blade 5 bending and twisting part radius R2, inner large blade 2 bending and twisting part radius R1, inner small blade 3 tip radius R3, angle A formed by center line and radius line of flow stabilizing hole 6, chord length L1 corresponding to outer side of bending and twisting part of outer blade 5, chord length L2 corresponding to inner side of bending and twisting part of inner large blade 2, impeller axial length W1, guide structure 10 axial length W2. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] like Figure 1-5 As shown, an impeller for animal husbandry comprises an inner hub 1, inner large blades 2, inner small blades 3, an outer hub 4, and outer blades 5. The inner large blades 2 and the inner small blades 3 are alternately and evenly arranged on the outer ring of the inner hub 1, the inner ring of the outer hub 4 is fixed to the blade tip of the inner large blades 2, and the outer blades 5 are evenly arranged on the outer ring of the outer hub 4. It is characterized in that: the inner large blades 2, the inner small blades 3, and the outer blades 5 are all composite blades; the inner large blades 2 are straight blades on the side close to the inner hub 1, and are bent and twisted blades on the side close to the outer hub 4; the outer The blade 5 is a bent and twisted blade on the side close to the outer hub 4, and a straight blade is used on the side of the outer blade 5 away from the outer hub 4; the inner small blade 3 and the outer blade 5 are geometrically similar in structure; a steady flow hole 6 is provided on the outer hub 4 between adjacent outer blades 5, and the center line of the steady flow hole 6 is not colinear with the center of the impeller; the radius of the outer hub 4 is R, the outer radius of the bent and twisted part of the outer blade 5 is R2, and the inner radius of the bent and twisted part of the inner large blade 2 is R1, wherein R2=(1.3~1.5)R, and R1=(0.6~0.9)R.

[0029] The geometric shape, number, angle, layout, bending and torsion of the blades have a profound impact on the performance, efficiency, life and stability of the impeller. The applicant has found through research that when the livestock fan adopts a double-layer blade structure, the layout and structural optimization design of the blades can significantly solve the problems of low wind pressure, high noise, poor stability, high surge, low efficiency, etc., and the double-layer blades have inherent defects, that is, there will be unstable or chaotic flow on both sides of the outer hub. The blade structure on both sides of the outer hub has a significant effect on changing this situation. Based on this, the applicant optimizes the design and layout of the inner and outer blades, and the inner large blade 2 close to the inner hub 1 side adopts a straight plate blade The blades are bent and twisted on the side close to the outer hub 4; the outer blades 5 are bent and twisted on the side close to the outer hub 4, and straight blades are used on the side away from the outer hub 4; the inner small blades 3 are geometrically similar to the outer blades 5; the outer hub 4 between adjacent outer blades 5 is provided with a steady flow hole 6, and the center line of the steady flow hole 6 is not colinear with the impeller center; the radius of the outer hub 4 is R, the outer radius of the bent and twisted part of the outer blade 5 is R2, and the inner radius of the bent and twisted part of the inner large blade 2 is R1, wherein R2=(1.3~1.5)R, R1=(0.6~0.9)R, which effectively increases wind pressure, reduces noise, improves stability, reduces surge, and improves efficiency.

[0030] Furthermore, the angle formed by the center line of the flow stabilizing hole 6 and the radius line at the position is A, wherein A=10° to 60°.

[0031] Furthermore, the position of the flow stabilizing hole 6 is closer to the trailing edge side of the outer blade 5 .

[0032] Considering that there will be a significant pressure difference between the inner and outer blades, the applicant has found that providing a flow stabilization hole on the outer hub can achieve a good internal and external pressure balancing effect.

[0033] Furthermore, the tip radius of the inner bladelet 3 is R3, where R3=(0.3-0.6)R.

[0034] The inner blade 3 is geometrically similar to the outer blade 5 in structure, and this structure can better optimize the flow channel on the inner hub side, making the boosting and conveying effect more obvious.

[0035] Furthermore, the chord length corresponding to the outer side of the bending and twisting part of the outer blade 5 is L1, and the chord length corresponding to the inner side of the bending and twisting part of the inner large blade 2 is L2, wherein L1>L2, and L1=(1.1-1.3)L2.

[0036] The chord length design can significantly improve the work efficiency, make the wind guide smoother, and make the fan more energy-efficient.

[0037] Furthermore, the surface of the impeller is covered with a wear-resistant and corrosion-resistant composite film.

[0038] Furthermore, the composite membrane is made of glass fiber reinforced plastic material.

[0039] Considering the wear and corrosion problems of the fan, the applicant selected fiberglass material to cover the impeller surface to extend its service life.

[0040] A negative pressure fan, characterized in that the fan includes a guide ring 7, a motor 8, a motor bracket 9 and a shaft sealing structure, the impeller is fixed to the end of the motor 8, the motor 8 is installed inside the guide ring 7 through the motor bracket 9, the impeller and the shaft are sealed with a sealing structure, and the impeller adopts the livestock impeller.

[0041] Furthermore, the sealing structure is an oil sealing structure using a sealing ring and an outer cover.

[0042] Furthermore, the motor bracket 9 has a “T”-shaped structure.

[0043] The "T" shape structure is beneficial to the stability of the fan and reduces the vibration of the fan.

[0044] Furthermore, a flow guiding structure 10 is provided on the inner wall of the flow guiding ring 7 along the flow path direction, and a cross-sectional curve formed after the radial cross section of the flow guiding structure 10 is expanded is a sine curve or a cosine curve.

[0045] Furthermore, the axial length of the impeller is W1, the inlet end of the guide structure 10 coincides with the front end of the radial projection of the impeller on the inner wall of the guide ring 7, and the axial length of the guide structure 10 is W2, wherein W2=(0.3-0.8)W1.

[0046] The stability of the flow state at the leading edge of the fan directly determines the occurrence of noise and surge. The present application sets a guide structure, the cross-sectional curve of the guide structure is a sine curve or a cosine curve, and the axial length of the guide structure is less than the axial length of the impeller. This structure can produce the effect of a streamlined guide noise reduction component, which can inhibit the development of the fan blade shedding vortex, thereby reducing the flow kinetic energy loss and fan noise; it can also improve the uniformity of the fan flow field and improve the fan efficiency. The axial length of the guide structure is not equal to the axial length of the impeller in order to reduce the impact on the outflow end and better improve the delivery efficiency.

[0047] The present invention discloses an impeller for animal husbandry, which comprises an inner hub, inner large blades, inner small blades, an outer hub and outer blades. The inner large blades and the inner small blades are alternately and evenly arranged on the outer ring of the inner hub, the inner ring of the outer hub is fixed to the blade tip of the inner large blade, and the outer blades are evenly arranged on the outer ring of the outer hub. The inner large blades, the inner small blades and the outer blades are all composite blades; the inner large blades are straight blades on the side close to the inner hub, and bent and twisted blades on the side close to the outer hub; the outer blades are bent and twisted blades on the side close to the outer hub, and straight blades on the side away from the outer hub; the inner small blades are geometrically similar in structure to the outer blades; the outer hub between adjacent outer blades is provided with flow stabilizing holes, and the center line of the flow stabilizing holes is not colinear with the center of the impeller; the radius of the outer hub is R, the outer radius of the bent and twisted part of the outer blade is R2, and the inner radius of the bent and twisted part of the inner large blade is R1, wherein R2=(1.3-1.5)R, and R1=(0.6-0.9)R. Due to the improvement of the impeller and blade structure, the wind pressure is effectively increased, the noise is reduced, the stability is improved, the surge is reduced, and the efficiency is improved.

Claims

1. An impeller for animal husbandry, comprising an inner hub (1), inner large blades (2), inner small blades (3), an outer hub (4), and outer blades (5), wherein the inner large blades (2) and the inner small blades (3) are alternately and evenly arranged on the outer ring of the inner hub (1), the inner ring of the outer hub (4) is fixed to the blade tip of the inner large blade (2), and the outer blades (5) are evenly arranged on the outer ring of the outer hub (4), characterized in that: The inner large blade (2), the inner small blade (3) and the outer blade (5) are all composite blades; the inner large blade (2) is provided with a straight blade on the side close to the inner hub (1), and with a twisted blade on the side close to the outer hub (4); the outer blade (5) is provided with a twisted blade on the side close to the outer hub (4), and a straight blade on the side away from the outer hub (4); the inner small blade (3) and the outer blade (5) are geometrically similar in structure; the outer hub (4) between adjacent outer blades (5) is provided with a flow stabilizing hole (6), and the center line of the flow stabilizing hole (6) is not colinear with the center of the impeller; the radius of the outer hub (4) is R, the outer radius of the twisted portion of the outer blade (5) is R2, and the inner radius of the twisted portion of the inner large blade (2) is R1, wherein R2=(1.3-1.5)R, and R1=(0.6-0.9)R.

2. The livestock impeller according to claim 1, characterized in that: The angle formed by the center line of the flow stabilizing hole (6) and the radius line at the position is A, wherein A=10° to 60°.

3. The livestock impeller according to claim 1, characterized in that: The tip radius of the inner bladelet (3) is R3, where R3=(0.3-0.6)R.

4. The livestock impeller according to claim 1, characterized in that: The flow stabilizing hole (6) is located closer to the trailing edge side of the outer blade (5).

5. The livestock impeller according to claim 1, characterized in that: The chord length corresponding to the outer side of the bending and twisting part of the outer blade (5) is L1, and the chord length corresponding to the inner side of the bending and twisting part of the inner large blade (2) is L2, wherein L1>L2, and L1=(1.1-1.3)L2.

6. The livestock impeller according to claim 1, characterized in that: The surface of the impeller is covered with a wear-resistant and corrosion-resistant composite film.

7. The livestock impeller according to claim 6, characterized in that: The composite membrane is made of fiberglass.

8. A negative pressure fan, characterized in that: The fan comprises a guide ring (7), a motor (8), a motor bracket (9) and a shaft sealing structure. The impeller is fixed to the end of the motor (8). The motor (8) is installed inside the guide ring (7) through the motor bracket (9). The impeller and the shaft are sealed by a sealing structure. The impeller is the livestock impeller described in any one of claims 1 to 7.

9. A negative pressure fan according to claim 8, characterized in that: The sealing structure is an oil sealing structure using a sealing ring and an outer cover.

10. A negative pressure fan according to claim 8, characterized in that: The motor bracket (9) is in a T-shaped structure.

11. A negative pressure fan according to claim 8, characterized in that: The inner wall of the guide ring (7) is provided with a guide structure (10) along the flow path direction, and the cross-sectional curve formed after the radial cross section of the guide structure (10) is expanded is a sine curve or a cosine curve.

12. A negative pressure fan according to claim 11, characterized in that: The axial length of the impeller is W1, the inlet end of the guide structure (10) coincides with the front end of the radial projection of the impeller on the inner wall of the guide ring (7), and the axial length of the guide structure (10) is W2, wherein W2=(0.3-0.8)W1.

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