I. Overview

SDF series tunnel ventilation fans are suitable for tunnel construction ventilation in highway, railway and hydropower projects, as well as other underground engineering construction ventilation. Main products include SDF _(A) type tunnel construction dedicated contra-rotating axial flow fan, SDF _(B) type tunnel worker dedicated contra-rotating axial flow fan, SDF _(C) type tunnel construction dedicated multi-speed contra-rotating axial flow fan, SDF _(D4) Energy-saving long construction tunnel construction four-stage contra-rotating axial flow fan, SDF _(E) New type tunnel dedicated axial flow fan, SDF _(P) New type tunnel construction dedicated variable frequency energy-saving fan and other five series of hundreds of specifications of products.

II. Working Principle

The number of blades in the first and second stages is different. The two-stage impellers are very close to each other and rotate relatively. The first-stage impeller rotates clockwise, and the second-stage impeller rotates counterclockwise. After the first-stage impeller obtains energy, it directly enters the second-stage impeller for boosting and then discharges. The function of the second-stage impeller, in addition to increasing the airflow energy, also has the function of the stator vane of other types of axial flow fans. While obtaining the guided straightening circumferential velocity component, it smooths the airflow impact, increases the airflow energy, and reduces noise.

III. Structural Features

1. Impeller: The impellers of the fans manufactured by our company adopt an adjustable impeller design, which can be adjusted according to different ventilation needs. It also meets the ventilation needs in plateau environments. Material: Steel, and arc flame spraying treatment; its strength is 20 times that of ordinary materials, with the advantages of corrosion resistance and high strength.

2. Dynamic Balance Test: Our company has a ø2.0 dynamic balance test bench. All fans are tested before leaving the factory to ensure product quality.

3. Fan Noise and Vibration: Silencers are installed at the inlet and outlet ends of the fan to meet the standard values stipulated in JB/T8690 "Noise Limits for Industrial Ventilation Fans". The A-weighted sound level noise LSA ≤25dB(A) at the best efficiency operating point; the vibration is lower than the vibration effective value (RMS) 4.6mm/s stipulated in JB/T8689 "Ventilation Fan Vibration Detection and Its Limit Values".

4. Housing and Other Component Materials: The housing adopts double-layer plate welding, with ultra-fine glass fiber cotton lining in the middle to achieve good noise reduction effect. The fan is sturdy and durable, has a long lifespan, and has undergone rigorous surface treatment; the minimum design service life of the fan is not less than 15 years.

5. Fan Manufacturing Standards: The fans are strictly manufactured in accordance with national standards and relevant industry standards.

6. The fan has the characteristics of compact structure, long air delivery distance, high efficiency, convenient maintenance, and convenient maintenance.

7. The performance of the fan is strictly inspected before leaving the factory, and relevant certificates of conformity are attached.

Special Note

I. Instructions for Use of Plateau Super-long Tunnel Ventilation Fans

The installation angle of the SDF series tunnel ventilation fans produced by our company is adjustable and can be used for construction ventilation in plateau environments. When using, simply adjust to the corresponding installation angle under the altitude conditions, which is simple to operate and easy to use.

When the fan is used in plateau areas, due to the low atmospheric pressure, the air density at the fan site is lower than 1.2kg/m³, resulting in the actual pressure of the fan being lower than the value in the performance table. In this case, the calculation of the fan performance is as follows:

Flow rate Q=Qo (m³/min)

Pressure =

P _o ——Pressure in the performance table (Pa)

P _bo ——Standard atmospheric pressure 101235Pa

P _b ——Fan operating site pressure, the relationship between atmospheric pressure and altitude is:

Where: H——Altitude, unit: km T——Fan operating site temperature (°C)

II. When users select and use the fan, the diameter of the matching air duct must be larger than the impeller diameter. When selecting the air duct, it is best to use a flexible air duct with a leakage rate ≤1% to achieve the best effect. The fan outlet is equipped with a direct head that is easy to connect with the air duct (a variable diameter connector that meets the requirements can also be made according to user needs).

According to the construction situation, the manufacturer recommends using the following response diameter air ducts. (Note: It is forbidden to use steel ring negative pressure air ducts).

III. According to user needs, non-standard fan design can also be carried out, providing optimized aerodynamic and structural design schemes to provide users with economical and reliable fans.

SDF _(B) Counter-rotating axial flow fan for tunnel construction

I. Model and Meaning

The model and meaning of the ventilation fan are as follows: SDF(B) type counter-rotating axial flow fan for tunnel construction

II. Technical Performance Parameter Table

III. Structural Diagram

IV. Dimensions

Note: If the dimensions of the fan change, the dimensions provided at the time of ordering shall prevail; the above parameters are for reference only.

The company's main business is the design, research and development, and manufacturing of various ventilators and their supporting products for mines, non-coal mines, and rail transit. Products involve 38 series of fan products, more than 3,000 specifications, including FB(D) series, FBC(D)Z series, FKZ series, rail transit SDS series, tunnel SDF series, etc.; supporting products include shaft, inclined shaft self-resetting explosion-proof doors, louver-type automatic regulating air doors, side-opening (vertical) automatic regulating air doors, butterfly valves, silencers, main ventilator online detection and fault diagnosis systems, non-stop fan reverse systems and intelligent oil injection systems, which can fully meet the ventilation needs of mines and are sold to various domestic fields and international markets such as Russia and Canada.

In recent years, the company has successively won the honorary titles of "Yuncheng Enterprise Technology Center", "Yuncheng Excellent Enterprise", "Yuncheng Intellectual Property Demonstration Enterprise", and "Innovative Small and Medium-sized Enterprise". The company has passed the "ISO9001 Quality Management System Certification", "ISO14001 Environmental Management System Certification", "ISO45001 Occupational Health and Safety Management System Certification", and its products have passed the "China National Compulsory Product Certification". It has also obtained a number of patents. With advanced process equipment, strong technical strength, excellent product quality, and a perfect service system, it has won unanimous recognition and praise from users. In particular, the green, environmentally friendly, and low-noise fans that have been focused on the market in recent years have achieved rapid development, becoming a well-known enterprise in the fan industry with leading technology.