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 first and second level blades is different, and the two stages of 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 airflow energy, also has the function of static guide vanes 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 the noise at the same time.

III. Structural characteristics

1. Impeller: The impeller of the fan manufactured by our company adopts an adjustable impeller, 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, and all fans are tested before leaving the factory to ensure product quality.

3. Fan noise and vibration: Mufflers are installed at the inlet and outlet ends of the fan to meet the standard value stipulated in JB/T8690 "Noise Limit for Industrial Ventilation Fans"; the A-weighted sound pressure level LSA ≤25dB(A) at the best efficiency operating point; vibration is lower than the effective value (RMS) of 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, with a long lifespan, and has undergone strict surface treatment; the minimum design service life of the fan is not less than 15 years.

5. Fan manufacturing standard: The fan is strictly manufactured according to national standards and relevant industry standards.

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

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

Special instructions

1. Instructions for using plateau super-long tunnel ventilation fans

The SDF series tunnel ventilation fans produced by our company have adjustable installation angles 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 use site is lower than 1.2kg/m³, which makes the actual pressure of the fan lower than the value in the performance table. In this case, the calculation of fan performance is as follows:

Flow rate Q=Qo(m³/min)

Pressure=

P _o ——Pressure in performance table (Pa)

P _bo ——Standard atmospheric pressure 101235Pa

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

Where: H - altitude, unit: km T - fan use site temperature (°C)

2. 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 joint 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).

3. 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 _(C) Variable-speed, multi-speed, contra-rotating axial flow fan for tunnel construction

I. Features

High efficiency, low noise, energy saving. The "variable-speed, multi-speed" design provides different ventilation methods and energy-saving effects at different speeds, overcoming the shortcomings of traditional non-adjustable blades. It achieves selective adjustability and is suitable for construction ventilation in high-altitude climates.

II. Model and Meaning

Ventilation model and meaning: SDF _(C) Variable-speed, multi-speed, contra-rotating axial flow fan for tunnel construction

III. Technical Performance Parameters

IV. Structural Diagram

V. Dimensions

Note: If the fan dimensions 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.