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 Meijin is committed to customer satisfaction as a standard, so we will provide customer service before and after sales. If you buy our equipment, even if it exceeds the free service period, we will also provide you with maintenance services.


After you buy our products, we will provide a complete set of training services free of charge. For example, operation training, simple troubleshooting training, the use of matters needing attention. Maintenance instructions and so on.

Equipment installation and commissioning

We will send an engineer directly to your equipment location to install and debug the equipment for you.

At the same time, we also welcome you to our China headquarters for free installation training.


We will send engineers to your equipment directly to repair your equipment.

Mei Jin has the right to interpret the above contents.

Main faults and Solutions

It is not difficult to improve the performance of high-pressure fan in one aspect, but it is difficult to improve the performance of high-pressure fan in all key aspects at the same time. Since the birth of the RHG brand, the company has always followed a research and development concept: that is, to manufacture comprehensive performance fan products. We will not emphasize the high pressure performance of the fan, and sacrifice the fan in energy saving, durability and other aspects of performance. Therefore, the RHG fan is a concentrated embodiment of high pressure, long life and energy saving.

Some faults may occur during the operation of the fan. For the faults, it is necessary to find out the causes quickly and solve them in time to prevent the accidents.

The main faults of fan are:

1, bearing box vibration.


A: the fan shaft is not parallel to the motor shaft, and the pulley groove is misplaced.

B: friction between the casing or inlet and impeller.

C: the stiffness of the foundation is insufficient or unfirm.

D: impeller rivet loosening or wheel deformation.

E: impeller shaft plate and shaft loosening;

F: the bolts and bolts of the case and bracket, bearing box and bracket, bearing box cover and seat are loosened.

G: the installation of fan inlet and outlet gas pipeline is not good.

H: rotor imbalance.

2, bearing temperature rise too high.


A: bearing box vibrate violently;

B: Grease poor quality, deterioration, containing dust, sand, dirt and other impurities;

C: the tightening force of the connecting bolt of bearing box cover and seat is too large or too small.

D: the shaft and the rolling bearing are installed skew, and the two bearings are not concentric.

E: rolling bearing is damaged.

3, the motor current is too large and the temperature rise is too high.


A: the valve or throttle valve in the intake pipe is not closed when driving.

B: the flow exceeds the specified value or the air pipe leaks.

C: the density of fan is too high.

D: motor input voltage is too low or power supply single-phase power failure;

E: affected by the severe vibration of the bearing box.

F: the work of the fan is deteriorating or malfunctioning.

1: air volume calculation method of blower


Q= (air volume) = /min

V= (wind speed) =m/sec

A= (cross sectional area) =

2. commonly used conversion formulas for fan pressure





1Torr=133.3 Pa

1Torr=13.3 mmAq


3. conversion units of common units for fans - air volume

1 (/min) (CMM) =1000l/min=35.31ft3/min (CFM)

Q common unit conversion tables - air volume

1m3/min (CMM) =1000 l/min = 35.31 ft3/min (CFM)

Q common terms

(1) standard condition: 20 C, absolute pressure 760mmHg, relative humidity 65%. This state is called STP for short, and the air weight of 1m3 is 1.2kg in this state.

(2) Absolute pressure of the air: the atmospheric pressure shown by the local barometer plus the sum of the surface pressures is usually expressed by kgf/m2 or mmaq.

(3) base status: 0 C, absolute pressure 760mmHg, relative humidity 0%. This state is called NTP for short, and the air weight of 1m3 is 1.293kg in this state.

Q pressure

(1) Static pressure (Ps): The so-called static pressure is the force exerted by fluid on the surface of the instrument and perpendicular to the surface. In the wind turbine, it is usually caused by the force of gravity and fan. In use, it is often expressed as kgf/m2 or mmaq, and can be measured directly. In the duct of the fan, the static pressure value in any direction is constant and there are positive and negative points. If the static pressure value is positive, the duct is expanding, and if the static pressure value is negative, the duct is being squeezed.

(2) Dynamic pressure (Pv): The so-called dynamic pressure is the pressure formed by the velocity of fluid flowing in the duct. It is often expressed as kgf/m2 or mmaq in use.

(3) Total pressure (PT): The so-called total pressure is the sum of static pressure and dynamic pressure, usually expressed in kgf / m2 or mmaq. The total pressure in the fan is fixed and will not change due to the contraction of the air duct.

Q wind pressure and temperature

Temperature changes affect the density of the air. Therefore, when other conditions remain unchanged and the temperature changes, the wind pressure must be corrected according to the following relationship to obtain the wind pressure value under the standard conditions:

P = P '(273 + t/293) (mm Aq)

Similarly, when the air density is changed, the wind pressure value can be amended as follows:

P = P '(1.2/ gamma) (mm Aq)

In the formula, the values on the right side of the equals such as P, t, and gamma are measured pressure, temperature and air density.

Relationship between Q pressure and speed

It is impossible for the pressure to change without changing the speed. Similarly, it is impossible for the pressure to change without changing the speed.

Pv=4.83 * r * V2 / 2G Pv: dynamic pressure (mmAq) r: air density (kg/m3)

G: gravity acceleration (m/s2) =9.8 V: wind speed (m/s)

Set the specific weight of rO to the standard state (1.293 kg/Nm3).

R=rO * 273 / (273+T) T: gas temperature

V=[(Pv/4.83) x (2g/r)]

Position of high pressure blower in gas system application

High-pressure blower in the gas system application position details, you can choose a variety of ways to contact the staff of the first general, get professional high-pressure blower in the gas system application position solution!

As a professional manufacturer of high-pressure blowers, we provide a stable supply of high-quality high-pressure blowers to businesses throughout the country, while providing comprehensive information consulting services.

The position of high pressure blower in gas system application:

(1) the high pressure blower is equipped with ingot before the primary cooler, before the electric tar collector. It is safe to operate under positive pressure, but the content of tar mist and naphthalene in gas is high, and the impeller of blower is easy to hang tar and naphthalene, which will shorten the maintenance period of blower.

(2) the high pressure blower is installed after the electric tar precipitator. This kind of electric tar trap should be operated under negative pressure and be safe, but the content of tar mist and naphthalene in gas is low, which is beneficial to the normal operation of blower.

(3) high pressure blower is installed after washing benzene tower.

Tips for selecting high pressure blower

RHG high-pressure blower is an indispensable industry machinery and equipment, the use of high-pressure blower is very extensive, because its selection is relatively complex. Generally speaking, the following two steps are required:

1. First of all, it is necessary to determine what function RHG high-pressure blower is used, whether it is suction or blowing, how much pressure is needed to suck and blow; if the parameters are wrong, sometimes the selected RHG high-pressure blower can not be used;

2. According to the calculated pressure and flow, the working curve above the corresponding working point can be found on the curve, and then the RHG high-pressure blower model can be selected according to the working curve. As long as the different working site, the pressure and flow demand is different, so, in order to get a relative alignment. The relevant data need to be calculated. If you have any need, you can contact ho Guan staff to help you figure out the selection.

Application of Hao Guan high pressure fan in screen printing machine

The working cycle program of screen printing machine, for example, flat screen platform monochrome semi-automatic hand screen printing machine, one of its working cycle is: to the piece - positioning - falling - down to the ink plate - raising - ink return stroke - off positioning - receiving.

The high-pressure blower plays the role of positioning in screen printing. It makes use of the high-pressure blower's great suction function to ensure that the printer absorbs the printed matter in the printing process, thus avoiding the offset of the printed matter in the printing process, ensuring the high accuracy and precision of the printing, and ensuring the printing efficiency.