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Operation Manual

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Content







Series L Rotary Blower
OPERATION MANUAL
Standard executed by product: JB/T 8941-1999


Please read this operation manual carefully before installation and operation.







Shandong Province Zhangqiu Blower Works PRC


Edition in May, 2003



Contents
1. Feature and main usage¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 1
2. Performance range¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 1
3. Terms¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 1
4. Operating principles¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 2
5. Structures¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 3
6. Installation and piping¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 6
7. Operation requirements¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 8
8. Operation methods¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 8
9. Maintenance and servicing¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 10
10.Trouble cause and remedy¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 11
11.Accessories¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 12
12.Performance tables¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 13
13.Main mating parts and repare parts¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 14
14.Outline installation diagrams¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - ¡ - 21


- 1 -
1 FEATURE AND MAIN USAGE
1.1 Feature
L Series Roots blowers(including negtive pressure Roots blowers i.e. Roots vacuum pumps,
hereafter referred to as simply the blower)are a positive displacement and rotary type blower.
Its best feature is that flow capacity does not change almost when operating pressure changes,
pressure range selected is wide, delivery gases are a forced one, delivered medium is free of oil
because of no internal lubrication inside the casing, and flow capacity, pressure rise and
vacuum are of a wide performance and application range on the basis of which user can choose
the most practical blowers. Also, the blowers are of a simple structure, easy maintenance, long
working life and a lot types of seal patterns meeting with different delivery medium.
1.2 Usage
Delivery medium of L series blowers is air, gases, sulphur dioxide, carbon dioxide etc(write
type of delivery medium in the purchase contracts.). Therefore the blowers are used in cement,
chemicals, fertilizer, metallurgy, steel, coal, building material, petroleum, power, paper-making,
textile, city gas, aquatic forming, pneumatic delivery, sewage treatment etc sections and
industries.
2 PERFORMANCE RANGE
2.1 As to the performance of the blowers, see table 4.
The inlet flow capacity in performance table is air flow under standard atmosphere as inlet
pressure and 20¡ æof inlet temp.
2.2 As to the performance of the negtive pressure blowers, see table 5. The inlet flow capacity in
performance table is air flow under standard atmosphere as outlet pressure and 20¡ æof inlet
temp.
Note:When the blowers are used to deliver special gases, the inlet flow capacity should be
converted according to the molecular weight of delivered medium and inlet temp and
pressure.
3 TERMS
3.1 Inlet condition: refers to inlet pressure i.e. standard atmosphere, inlet temp of 20¡ æand relative
humidity of 50%.
3.2 Pressure rise: refers to pressure difference of static pressure between the inlet and the outlet
when inlet pressure i.e. standard atmosphere.
3.3 Description of type for the blower(take L93WD type blower for example)



- 2 -
£ Ì £ ¹ £ ³ £ × £ Ä©¤ ©¤ Driving type : D£ -Direct coupling driving
C£ -Belt driving with cantilever support
Structure type: W£ -Horizontal
L£ -Vertical
Serial number of impeller length
Serial number of the blower
Code of the blower
Note:The blower which centrelines of two impellers locate in same vertical plane is referred to
as vertical type. The blower which centrelines of two impellers locate in same horizontal
plane is referred to as horizontal type.
4 OPERATING PRINCIPLES
The Roots blowers are a positive displacement type unit, whose two impellers in relation to
one another to maintain the minute but definite clearances operate in opposite directions and
equal angular speed within the casing by the use of timing gears drived. As the impellers rotate,
air is drawn into the inlet side and forced out to the outlet where the air is discharged forcedly
against the resistance of high-pressure air at the outlet side. Operation condition as whown in
Figure 1 and Figure 2.

Figure 1: Flow scheme through a vertical type blower


Figure 2: Flow scheme through a horizontal type blower

- 3 -
Body volume shown in Figure 1(a) and Figure 2(a) is divided into three chambers:
Chamber( ¢ ñ) venting to the inlet and chamber( ¢ ñ’) bearing the inlet pressure, and
chamer(¢ ò) venting to the outlet bearing the outlet pressure.
Body volume shown in Figure 1(b) and Figure 2(b) is divided into two chambers:
chamber(¢ ñ) venting to the inlet bearing the inlet pressure and chamber(¢ ò) venting to the
outlet bearing the outlet pressure.
Body volume shown in Figure 1(c) and Figure 2(c) is divided into three chambers:
Chamber(¢ ñ), Chamber(¢ ñ’) and chamber(¢ ò) are the same as shown in Figure 1(a) and
Figure 2(a) but the impellers have rotated through 90¡ ã and left place and right place have
made an interchange.
Above operating process in which the impellers rotate through 90¡ ãconstantly repeating
forms complete operating process for the Roots blowers.
5 STRUCTURES
5.1 Structure drawing
The structures of the blower as shown in Figure 3. Description of main parts is listed in
Figure 3
Table 1 Description of main parts
Item
No
Description
Item
No
Description
1 Casing 7 Bearing carrier-Drive end
2 Headplate 8 Bearing carrier-Gear end
3 Impeller 9 Seal assembly
4 Driving shaft 10 Main tank
5 Driven shaft 11 Secondary tank
6 Timing gear 12 Bearing seat
- 4 -
5.2 General Description
5.2.1 Casing
The casing is made from super grey cast iron. Geneally middle-sized and small-sized
blowers below L8 type blower are of solid structure and large-sized blowers above L8 type
blower are of upper and lower split structure. Its air chamber is formed with left and right
headplates and located with locating pins.
5.2.2 Headplates
The headplates are made from super grey cast iron. Generally the headplates of
middle-sized and small- sized blowers below L8 type blower are of solid structure and the
headplates of large-sized blowers above L8 type blower are of upper and lower split structure
with seal cartridge and bearing cartridge.
5.2.3 Impellers
The impellers are made from super grey cast iron, and machined accurately by a special NC
machine tool. Generally its cross section is of the involute profile. The impellers of the cycloid
and envelope profiles are a little.
5.2.4 Driving and driven shafts
The driving shaft and driven shaft are made of a carbon constructional steel with hardening
and tempering and machined accurately. Impeller assembly with the shaft is dynamically
balanced and tested, and have met the specified dynamic balance accuracy.
5.2.5 Timing gears
The timing gears consist of gear rim and hub which are located with taper pin to adjust
impeller clearances. The fit between the hub and shaft is of taper fit for removal, installation
and maintenance. Function of the timing gears is both the driving and impeller locating. The
accuracy and wearing quality of the timing gears are of higher requirement because its accuracy
and wearing condition directly effect the mesh of the impellers. Gear rim is made of a super
carbon constructional steel or structure alloy steel with hardening and grinding teeth. Tooth type
is straight tooth or helical tooth.
5.2.6 Bearing carrier at the gear end
The bearings shown in table 2 should be installed in the bearing carrier to resolve axial
location and to adjust axial clearance between the impellers and headplates. Lubrication of the
bearings is of splash one for L1 to L9 types blowers, and is of oil-bath one for ZL10 type
blower.
5.2.7 Bearing carrier at the drive end
The bearings shown in table 2 should be installed in the bearing carrier so that the driving
shaft and driven shaft may freely expand with thermal expansion. Lubrication of the bearing is
of splash one.
- 5 -
Table 2
Mach
No.
Bearings at the gear end Bearings at the drive end
L1 6205 sized ball bearing Nu205 sized cyl roller bearing
L2 6306 sized ball bearing Nu306 sized cyl roller bearing
L3 2307 sized aligning ball bearing Nu307 sized cyl roller bearing
L4 22310C sized aligning roller bearing Nu2310 sized cyl roller bearing
L5 22312C sized aligning roller bearing Nu2312 sized cyl roller bearing
L6 22316C sized aligning roller bearing Nu2316 sized cyl roller bearing
L7 22319C sized aligning roller bearing Nu2319 sized cyl roller bearing
L8 22322C sized aligning roller bearing Nu2322 sized cyl roller bearing
L9 22326C sized aligning roller bearing Nu2326 sized cyl roller bearing
ZL10 22334C sized aligning roller bearing Nu2334 sized cyl roller bearing
5.2.8 Seal
The labyrinth seal is used for delivery air. Packing seal is used for delivery semiwater gas or
sulphur dioxide.
5.3 Lubricating structure
5.3.1 Main tank
The oil in main tank is used to lubricate the timing gears and the bearings. Gears are of
oil-bath lubrication. The bearings are splash lubricated by rotating gear. The cooling device or
cooler are installed in main tank for cooling oil. For simplification of structure and control
generally the cooler is unnecessary but the blowers may be ensured normally operating because
the oil temp is lower when pressure rise is less than 49kPa. The coolers are used to cool the
blowers series L1 through L6, and inner cycle cooling unit without cooler is installed for the
blowers series L7 through ZL10.
5.3.2 Secondary tank
The oil inside the secondary tank is used to lubricate the bearings. The bearings at the
driving shaft and the driven shaft are splash lubricated by the common secondary tank through
an oil slinger for L1 to L9 type blowers. The bearings at the driving shaft and the driven shaft
are oil-bath lubricated by two individual Secondary tanks(referred to as driving oil sump set
and driven oil sump set.) in which the bearings are immersed for ZL10 type blower.
5.4 Clearance adjustment
All types of the blower clearances are the key factor which is used to ensure the
performance and safe operation of the blower. The installing clearances of the blower have been
- 6 -
adjused well when leaving factory therefore users do not change arbitrarily those clearances.
The clearances should be adjusted by user under the instruction given by us.
5.4.1 Adjusting clearance between impellers
Loose lockbolts on the gear rim and hub, and romove locating taper pin then adjust relative
location of the installing angle of the gear rim and hub to reach effect adjusting the clearance of
impeller to impeller. The holes of locating pin should be revised or the holes of locating pin
should be redrived after the clearances are adjusted well and then the gear rim and hub are
located with taper pins and reliably fastened. The impellers should be rotated through 360¡ ã
when adjusting the clearances because the clearances of quarter impeller contour can be
measured only with 90¡ ãof rotation.
5.4.2 Clearance adjustment between impeller and headplate
For adjusting the clearances, loose the bolts on the bearing carrier on the location end, and
change the thickness of adjusting washer. The clearance of the drive side will be decreased by
the use of increasing thickness of the washer, the reverse is ture. The bolts should be
retightened fast and the clearances between impeller and headplate should be measured after
completion adjustment.
5.4.3 Trial-running must be made under no load after adjusting clearances according to the stipulation
in 8.2 item.
6 INSTALLATION AND PIPING
6.1 Installation site
6.1.1 The blower should be installed in a bright building without powder. In case that the blower has
to be installed outdoor, take necessary rainproof and sunshine-proof measures and pay special
attention to safeguard the motor.
6.1.2 The blower should be installed in an enough wide room, which is convenient for removal,
assembly and daily inspection. The site should be well ventilated.
6.2 Foundation
6.2.1 The foundation of the blower is of concrete one. When making the foundation, consider the
blower weight and the resistance to pressure so as to ensure the foundation is of sufficient
pressure area. The concrete strength should not be less than C20 for common foundation.
6.2.2 The concrete foundation should be of enough prefabricated holes to instal anchor bolts. The
foundation surface should be as level as possible.
6.2.3 The blower should be installed after the concrete is hardened completely.
6.3 Installation
6.3.1 Place the blower on the foundation and insert wedge blocks between the base and the
foundation to make the base supporting evenly and ensure leveling. Level the base and also
- 7 -
leave the gap between the base and the foundation for grouting concrete.
6.3.2 Insert the anchor bolts into the prefabricated holes on the foundation and turn the nuts fully
making the bolts hanging over the holes. In this case, If the blower is supported only by partial
foundation then the blower will be tilted to some degree, no matter how solid the foundation is.
Therefore place wedge blocks properly in some location to maintain proper support.
6.3.3 Place a leveler on the machined surfaces of the blower to adjust the body being level. The
tolerance is 0.2 mm per meter.
6.3.4 Pour the mortar into the gap under the base and the anchor bolt holes leaving for several days.
Tighten the anchor nuts firmly and evenly after the concrete hardened.
6.3.5 The dropping voltage start cabient should be installed to void the blower being damaged by
direct start, and to maintain normal power supply for users. It is recommended that users may
use soft start to decrease the shock of electric power network for factory.
6.4 Piping
The right angle elbow should not be used on principle and there should not be too many
elbows so as to avoid increasing any unnecessary resistance. Place supporting unit on the piping
to prevent the blower from bearing an additional loads.
6.4.2 In the first place, check the blower inner and confirm that there no are sundries inside the
blower, and then seal the inlet and the outlet of the blower. Remove thoroughly any rust,
foreign material, dust etc in the inlet and outlet pipings then connect with the blower. The
flange interface should be required to protect from leakage. Instal the inlet filter with full
volume. The filter should be clean. If the inlet resistance is too high then remove the filtered
mesh of the filter for cleaning.
6.4.3 The flexible joint should be installed at the inlet and outlet ends of the blower to remove the
effect due to piping vibration and thermal deformation, which is convenient for piping
connecting with the blower.
6.4.4 Take care to fit pressure gauge on the discharge side of the blower and vacuum gauge on the
inlet side of the vacuum pump. Scales of both gauges should conform with application range.
6.4.5 Make sure that relief valve and check valve on the discharge side of the blower to avoid the
damage on the blower caused by overload and return air, and vacuum relief valve on the inlet
side of the vacuum pump to avoid the overload effected on the vacuum pump. Mating relief
valve and vacuum relief valve have been adjusted well according to pressure required by user
before leaving factory, therefore they are adjusted by user to be unnecessary.
The venting valve should be installed on the discharge side of the blower, which may bring
into venting action so that the blower can be started and stopped under no load. The by-pass
valve should be installed on the inlet side of the vacuum pump to be opened before it started
and stopped so that the vacuum pump is started and stopped under no load.
- 8 -
All the said valves should be installed on horizontal pipes. In the case of the silencer, check
valve should be installed after the silencer.
6.4.6 The silencer should be installed in the place nearer to the blower to reach better noise
elimination.
6.4.7 It is necessary to arrgnge water cooling piping for the master tank of the blower when cooling
water temp required less than or equal to 25¡ æ, cooling water pressure is 196 to 294kPa, and
flow capacity is 10 to 13 L/min. The governing valve should be located before the inlet of
cooling water. As for the cooling water piping of the master tank,see Figures 5,6 and 9.
6.5 Aligning coupling
In the case of the blower L1 through L7 and its motor with common base, the coupling
aligning has been adjusted well when the blower leaving factory therefore the coupling should
not be removed arbitrarily by user. In the case that the blower L8 through ZL10 and its motor
are of individual base, the coupling aligning should be checked by the use of the dial gauge as
shown in Figure 4. The allowance of axial concentricity of the couplings on the blower side and
motor side should be less than 0.08 mm, and the allowance of end face parallelism less than
0.18 mm.

Figure 4
7 OPERATING REQUIREMENTS
7.1 The inlet temp of the medium delivered should not exceed 40¡ æ.
7.2 The impurity content of the medium delivered should not be over 100mg/m
3
and max size of
fine grains should not be more than half of min clearance.
7.3 The bearing temp should not be more than 95¡ æand the oil temp not more than 65¡ æ, and
vibration speed at the bearing location not more than 11.2mm/s during operation.
7.4 The operating pressure should not exceed the rated pressure rise range stipulated on the
nameplate.
8 OPERATION METHODS
8.1 Operation preparation
8.1.1 Remove thoroughly all the dust and foreign material inside and outside the blower and avoid
- 9 -
any oil to get in the blower.
8.1.2 Check that if some connection locations on the inlet and outlet are tightened or not, and if the
piping supports are complete or not, and if the installation of the cooling water pipings is well
or not when the cooling water piping required.
8.1.3 If there are the slag and iron dust etc in mating piping then remove thoroughly them.
8.1.4 Fill the oil tank getting at the middle of two oil level lines. If oil is too less, then the gears and
the bearings will be burned. If oil is too much, then gears and other components will be
damaged because of the exceeding of the allowable temp rise. Usually oil is full comsuption
system one L-AN68.
8.1.5 Never fill the tank with oil during operation of the blower. Replace original oil with new one
after one week of operation for the first time, and replace oil again after one month for the
second time. Replace periodically the oil in the gear box and the bearing box later on(see 9.2
item).
8.1.6 Turn manually the coupling of the blower in rotation direction to check the blower for any
abnormal signs.
8.2 Trial-running
The blowers which are new one and heavy reparative one or long-time unused one should
be trial- run before the blower putting in operation.
8.2.1 Open the valves on the inlet and outlet. Switch on power under noload to check the rotation
direction. Start the blower after switching on cooling water pipes for request cooling water of
the blower.
8.2.2 Run the blower for 20 to 30 minutes under no load to check for any abnormal vibration and
beating. Stop the blower operation at once to find out the trouble cause when any abnormal
signs appeared. In most cases, thouble cause may be improper installation, bad alignment of the
coupling or incorrect oil level.
8.2.3 Then run the blower for 2 to 3 hours under normal load condition, and also observe the temp
and vibration for every component.
8.2.4 Observe the reading on the ampere meter during blower operating. Stop the blower at once
when any abnormal signs found. Trouble cause mostly is the fact that the impellers contact with
the headplates. The blower is adjusted thoroughly to run for certain time prior to delivery. Pay
special aftention to the clearance adjustment whenever removal and installation at site.
8.3 Precaution during operation
8.3.1 During operation check the bearing temp, the oil temp and ampere meter reading, and check
cooling water quantity if which meets the needs for the blower. As for the blower with packing
seal, check the leak condition of the seal. Replace the seal at once when the leak is serious
because the leakage will result in the blower damage.
- 10 -
8.3.2 Perform periodical inspection and make note(refer to 9.2 section).
8.3.3 Release pressure and decrease load, and then stop the blower.
9 MAINTENANCE AND SERVICING
9.1 Daily maintenance
9.1.1 Pay special attention to that if there are the rubbing or foreign material absorbed inside the
casing during operation. Therefore check constantly operation condition of the blower. Stop the
blower operating at once when finding out serious rubbing because excessive local temp rise of
the casing due to the rubbing will burn surface paints.
9.1.2 Check constantly and pay attention to the temp, vibration and sound etc of the bearings during
daily operation.
9.1.3 The impellers and the casing will be rusted during long operation to increase working
clearances, inner leak, the casing temp rise and the discharge temp so that flow capacity will be
decreased therefore stop the blower operating and measure clearances, and take corrected
precautions.
9.1.4 Be certain to drain off cooling water to protect the blower from the damage caused by freezing
water after the blower stopping in cooling winter.
9.2 Regularly checking
9.2.1 Daily checking
9.2.1.1 Check oil level for oil level gauge. Because either too muth or too less of oil will damage the
gears and the bearings.
9.2.1.2 Check the temp of master tank and secondary tank, and one at the bearing.
9.2.1.3 Check suction pressure and discharge pressure to determine that the operation condition of the
blower is normal or not.
9.2.1.4 Check motor load. Be careful that the increase at motor load indicates some abnormal status.
9.2.2 Quarterly checking
Replace the oil in master tank and clean air filter.
9.2.3 Half- yearly checking
Replace the oil in secondary tank and check the support condition for the blower pipes. As to
the blower with packing seal, check leakage condition for seal.
9.2.4 Yearly checking
9.2.4.1 Check lip seals of rotation shaft.
9.2.4.2 Check the impellers and the casing inner, and various clearances.
9.2.4.3 Check the gears.
9.3 Disassembly
9.3.1 Precautions when disassembling
- 11 -
9.3.1.1 Make tally marks on all connection and matching location.
9.3.1.2 Not damage the seal pad on connection location.
9.3.1.3 Measure the thickness of all seal pads when removing them.
9.3.2 Make sure all the components removed in partcular the bearings should be protected from dust
and rust.
9.4 Assembly
9.4.1 Precautions when assembling
9.4.1.1 Check all the components for any damage occurred during disassembling.
9.4.1.2 Clean all the components thoroughly.
9.4.1.3 Thickness of pads at each location.
Replace the pads damaged or lost with new one of same thickness and material.
10 TROUBLE CAUSE AND REMEDY
As for usual trouble cause and remedy of the blower, see table 3.
Table 3
Trouble Possible Cause Remedy
Lack of flow
1. Fliter mesh blocked
2. Excessive clearance
1. Replace or clean filter.
2. Adjust clearance.
Overload of
motor
1. Filter mesh blocked
2. Excessive pressure loss in piping


3. Rubbing between impeller to
headplate, impeller to casing and
impeller to impeller.
1. Replace or clean filter.
2. Check pressure difference between
inlet and outlet. Take corrected
precautions.
3. Adjust clearances.
Overheating
1. Too much oil in gar box
2. Excessive pressure rise
3. Rubbing between impeller to
headplate, impeller to casing and
impeller to impeller.
4. Improper cooling in gear box
1. Adjust oil level
2. Check inlet and outlet pressure
3. Find out rubbing causes and remove
them..

4. Insure cooling water flowing and
meet operation requirement.
Knocking
1. Abnormal position of adjustable
gear to impeller.
2. Improper assembling
3. Abnormal pressure rise

4.Gear wear caused by overload or
bad lubrication
1.Readjust position

2. Reassembling
3. Find out cause for pressure rising
and remove them.
4. Replace timing gears.
Excessive
bearing or gear
wear
1. Bad oil
2. Lack of oil
1. Replace oil
2. Supply oil
- 12 -
Table 3 (cont)
Shaft or
impeller wear
1. Overloading
2. Air backflow in system
1. Replace shaft and impellers.
2. Find out cause and make measure to
avoid backflow.
Leakage of
packing seal
1. Seal lost efficiency
2. Excessive bearing clearance
1. Replace seal
2. Replace bearing
11.ACCESSORIES
Supply of the following blower accessories according to stipulation of the contract.
ZlX silencer, XQZ electric control chest, ZLL filter, ZLT elastic joint, ZXG acoustic
piping, ZXW acoustic elbow, acoustic cover, anti- vibration frame, electric venting valve, no
return valve, relief valve, vacuum valve, pressure gauge and vacuum gauge.

























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Shandong Province Zhangqiu Blower Works

Add.:No.141,Mingshui street,Zhangqiu city,Shandong province,PRC
Tel:+86-531-3214516
Fax:+86-531-3225838
Zip:250200
E-mail:[email protected]
Http://www.Blower.cn

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