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CN-121976970-A - Industrial fan

CN121976970ACN 121976970 ACN121976970 ACN 121976970ACN-121976970-A

Abstract

The invention discloses an industrial fan, belongs to the technical field of fans, and is designed for solving the problems of unreasonable design and the like of the existing fans. The industrial fan comprises an impeller, at least two blades and a shell, wherein the impeller comprises a zigzag middle disc, the length of a runner of the impeller is larger than a set value, the width of a steady flow area of the impeller is larger than the set value, the assembled impeller and the blades are arranged in the shell, and the molded line of the inner wall surface of the shell is matched with the airflow field of the impeller. The industrial fan comprises the impeller and the shell, the impeller comprises the zigzag middle disc, the air flow distribution at the outlet of the impeller can be improved, the installation angle of the blades can be designed conveniently, the impact of air on the welding seams of the blades can be reduced, the axial additional force generated by air pressure difference can be reduced, the service life of the bearing is prolonged, and the rotational inertia is reduced. The inner wall surface molded line of the shell is matched with the air flow field of the impeller, so that the problem of large energy loss caused by the turbulence of the flow field of the existing fan is solved, the flow field of the air flow reaches the optimal state, and the noise is reduced.

Inventors

  • Shao jiaxing
  • XU ZHAO
  • CHANG CHENG
  • ZHANG HAO
  • WANG YUTING
  • JING SHUHUI

Assignees

  • 同方智慧能源有限责任公司
  • 同方股份有限公司

Dates

Publication Date
20260505
Application Date
20260318

Claims (10)

  1. 1. Industrial fan, its characterized in that includes: The impeller (1) comprises a zigzag middle disc, the length of a runner of the impeller (1) is larger than a set value, and the width of a steady flow area of the impeller (1) is larger than the set value; At least two blades (2), all of the blades (2) being uniformly disposed on the outer periphery of the impeller (1), and The shell (3), the impeller (1) and the blades (2) after the assembly are arranged in the shell (3), and the molded line of the inner wall surface of the shell (3) is matched with the airflow field of the impeller (1).
  2. 2. The industrial fan according to claim 1, wherein the inlet angle of the blade (2) is α1=arctan (Cm 1/U1) +i, wherein Cm1 is an inlet radial flow rate (m/s) calculated as a flow, U1 is an impeller inlet circumferential speed (m/s), u1=pi×d1×n/60, N is a rotational speed, i is an attack angle ranging from 3 ° to 8 °, D1 is a blade inner diameter, d1=c×d2, c=0.4-0.9, D2 is a blade outer diameter, d2=60× (Pt/ψρ) 0.5 /pi×n, pt is a target full pressure (Pa), ρ is a gas density (kg/m 3 ), and ψ is a pressure coefficient; The outlet angle alpha 2 of the blade (2) is equal to arctan (Cm 2/(U2-C2), wherein Cm2 is the outlet radial flow rate (m/s), C2 is the outlet tangential flow rate (m/s), U2 is the impeller outlet circumferential speed (m/s), U2 is equal to pi x D2 x N/60, N is the rotating speed, D2 is equal to 60 x (Pt/psi ρ) 0.5 /pi x N, pt is the target full pressure (Pa), ρ is the gas density (kg/m 3 ), and psi is the pressure coefficient.
  3. 3. The industrial fan according to claim 2, characterized in that the inlet height b1=q/(pi×d1×ηv×cm1) of the blade (2), where Q is the design flow (m 3 /s), ηv is the volumetric efficiency, the value range is between 0.85 and 0.95, cm1 is the inlet radial flow rate (m/s), the value range is between 15m/s and 35 m/s; The outlet height B2=Q/(pi×D2×eta v×Cm2) of the blade (2), wherein Q is the design flow (m 3 /s), eta v is the volumetric efficiency, the value range is 0.85-0.95, cm2 is the outlet radial flow rate (m/s), cm2= (0.8-1.2) times Cm1; Impeller inlet heights b3=a1×b1+a2×b2, a1 and a2 are empirical parameters, respectively.
  4. 4. The industrial fan according to claim 1, wherein the inlet diameter DL = kx (Q/N) 1/3 of the blade (2), wherein K is an inlet diameter coefficient, the value of K in the backward curved blade ranges from 4.5 to 5.0, the value of K in the forward curved blade ranges from 4.0 to 4.5, Q is a design flow (m 3 /s), and N is a rotational speed.
  5. 5. The industrial fan according to claim 1, characterized in that the front disk arc R = r×e (θtan β) of the blade (2), wherein R is the inlet radius (m), β is the average blade pitch angle, β= (β1+β2)/2, β1 is the inlet mounting angle, β2 is the outlet mounting angle, θ has a value ranging from 0 to γ, γ is the wrap angle, γ = 180 °/pi×ln (D2/D1) cot ((β1+β2)/2), D1 is the blade inner diameter, d1 = c×d2, c = 0.4-0.9, D2 is the blade outer diameter, d2 = 60× (Pt/ψρ) 0.5 /pi×n, pt is the target total pressure (Pa), ρ is the gas density (kg/m 3 ), ψ is the pressure coefficient; The number Z=2pi×sinβ/ln (D2/D1) ×k1 of the blades (2) provided on the impeller (1), wherein K1 is a correction coefficient.
  6. 6. Industrial fan according to claim 1, characterized in that the inlet radius R = R1e tanf (φ,A,C,) of the housing (3), R1 is an inlet radius correction factor.
  7. 7. The industrial fan according to any one of claims 1 to 6, further comprising: A machine vision inspection assembly including an image acquisition device for inspecting process conditions through machine vision to automatically identify process steps, and The control module is connected to the machine vision detection assembly to receive image information, and can construct an interlocking control model between the industrial fan and the production process through a built-in AI model, and the operation working condition and the load of the industrial fan are predicted in advance so as to automatically adjust the production process steps.
  8. 8. The industrial fan of claim 7, wherein the industrial fan has a variable frequency function.
  9. 9. The industrial fan of claim 7, further comprising a noise monitoring device connected to the control module, wherein the noise monitoring device is configured to monitor the noise spectrum of the industrial fan in real time and send a monitoring result to the control module, and wherein the control module is configured to dynamically adjust an operating parameter of the industrial fan or activate a muffler device according to the monitoring result.
  10. 10. The industrial fan of any of claims 1-6, further comprising a control module and a parameter detection assembly, the control module comprising: The sensing layer is connected to the parameter detection component, and the parameter detection component is used for detecting at least the air quantity, pressure, temperature, vibration, rotating speed and current of the industrial fan, and all detection results can be sent to the sensing layer; the transmission layer is used for receiving the detection result sent by the perception layer and sending the detection result; A processing layer with data storage, data processing and data analysis capability, for receiving the detection result sent by the transmission layer, converting the data into identification information and storing the identification information, and And the application layer is used for feeding the identification information obtained by the analysis of the processing layer back to the operation and maintenance management and control of the industrial fan so as to monitor, diagnose and manage the operation state of the industrial fan.

Description

Industrial fan Technical Field The invention relates to the technical field of fans, in particular to an industrial fan. Background In the industries of steel and chemical industry, etc., an industrial fan is required to generate air flow. The industrial fan mainly comprises an impeller, blades and a shell, wherein the blades are arranged on the impeller and can synchronously rotate along with the impeller, the impeller and the blades are arranged in the shell, an air outlet is formed in the shell, and the impeller drives air flow generated by rotation of the blades to be blown out through the air outlet. The existing industrial fan is simple in structure, unreasonable in design and wide in blade installation angle design, so that the air flow at the outlet of the impeller is unevenly distributed, the matching precision of the shell and the impeller is low, and energy loss is large due to flow field disorder. Disclosure of Invention The invention aims to provide an industrial fan, which solves the problem of unreasonable design of the existing fan and ensures more uniform distribution of outlet airflow. To achieve the purpose, the invention adopts the following technical scheme: the industrial fan comprises an impeller, at least two blades and a casing, wherein the impeller comprises a zigzag middle disc, the length of a runner of the impeller is larger than a set value, the width of a steady flow area of the impeller is larger than a set value, all the blades are uniformly arranged on the periphery of the impeller, the impeller and the blades after assembly are arranged in the casing, and the inner wall surface molded line of the casing is matched with the airflow field of the impeller. In one preferred embodiment, the inlet angle of the blade is α1=arctan (Cm 1/U1) +i, wherein Cm1 is an inlet radial flow rate (m/s) and is calculated according to flow, U1 is an impeller inlet circumferential speed (m/s), U1=pi×d1×n/60, N is a rotational speed, i is an attack angle ranging from 3 ° to 8 °, D1 is a blade inner diameter, d1=c×d2, c=0.4-0.9, D2 is a blade outer diameter, d2=60× (Pt/ψ) 0.5/pi×n, pt is a target full pressure (Pa), ρ is a gas density (kg/m 3), ψ is a pressure coefficient, the outlet angle α2=arctan (Cm 2/(U2-C2), C2 is an outlet tangential flow rate (m/s), U2 is an impeller outlet circumferential speed (m/s), d1=c×d2, c=0.4-0.9, and D2 is a target full pressure (Pa), ρ is a gas density (kg/m 3), and p is a target full pressure (pt×ρ/35×) is a pressure coefficient. In one preferred embodiment, the inlet height b1=q/(pi×d1×ηv×cm1) of the blade, where Q is the design flow (m 3/s), ηv is the volumetric efficiency, the value range is between 0.85 and 0.95, cm1 is the inlet radial flow (m/s) and the value range is between 15m/s and 35m/s, the outlet height b2=q/(pi×d2×ηv×cm2) of the blade, where Q is the design flow (m 3/s), ηv is the volumetric efficiency, the value range is between 0.85 and 0.95, cm2 is the outlet radial flow (m/s), cm2= (0.8-1.2) ×cm1, and the impeller inlet heights b3=a1×b1+a2×b2, a1 and a2 are empirical parameters, respectively. In one preferred embodiment, the inlet diameter dl=k× (Q/N) 1/3 of the blade, where K is an inlet diameter coefficient, the value of K in the backward curved blade ranges from 4.5 to 5.0, the value of K in the forward curved blade ranges from 4.0 to 4.5, Q is a design flow (m 3/s), and N is a rotational speed. In one preferred embodiment, the front disk arc r=r×e (θtan β), where R is an inlet radius (m), β is an average blade inclination angle, β= (β1+β2)/2, β1 is an inlet mounting angle, β2 is an outlet mounting angle, θ has a value ranging from 0 to γ, γ is a wrap angle, γ=180°/pi×ln (D2/D1) cot ((β1+β2)/2), D1 is a blade inner diameter, d1=c×d2, c=0.4-0.9, D2 is a blade outer diameter, d2=60× (Pt/ψρ) 0.5/pi×n, pt is a target full pressure (Pa), ρ is a gas density (kg/m 3), and ψ is a pressure coefficient, and the number z=2×sin β/ln (D2/D1) of the blades set on the impeller is a correction coefficient. In one preferred embodiment, the inlet radius r=r1e tanf(φ,A,C,) of the casing, and R1 is an inlet radius correction coefficient. In one preferred embodiment, the industrial fan further comprises a machine vision detection assembly, a control module and an interlocking control module, wherein the machine vision detection assembly comprises an image acquisition device and is used for detecting the production condition of the process through machine vision so as to automatically identify the production process steps, the control module is connected to the machine vision detection assembly so as to receive image information, and can construct an interlocking control model between the industrial fan and the production process through a built-in AI model, and the operation working condition and the load of the industrial fan are predicted in advance so as to automatically adjust the production process steps. In one preferred embodiment, the industrial fan has