This system (MYCOM Reciprocating Compressor WBH Series) has been
designed as an advanced compressor from W Series (WB). Major structural
changes ...
2200D3NE-WBH2006.3.
This system (MYCOM Reciprocating Compressor WBH Series) has been designed as an advanced compressor from W Series (WB). Major structural changes are listed below:
z Shaft seal z Thrust bearing z Main bearing and its periphery
This manual presents only refinements in WBH Series. The combined use of this manual and the “MYCOM Freezer W Series Operation Manual” aids a better understanding of the system.
This system falls into the following models. Table 3-1 System Models
Single two-stage compressor
4WBH, 6WBH, 8WBH, 8WBHH (Option: 6WBHU, 8WBHU, 8WBHHU) 42WBH, 62WBH
Single-stage compressor
A specification is to be split up according to refrigerant types. See “4.5 Single-stage 8-cylinder System Crankshaft” and “4.6 Unloaded Running (Optional)” in Chapter 4 Structural Upgrades on page 4-6 for model types.
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2200D3NE-WBH2006.3.
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This section describes the refinements in WBH Series as compared with WB Series.
The crankcase in WBH Series is endowed with the bearing head function, which has eliminated the bearing head part of the WB Series. (see Figure 4-1: Crankcase is shown closed) The pressure equalizer installed between the crankcase and suction casing has been modified in response to the above change. (see Figure 4-2) The WBH Series no longer has jacket cooling.
Attachment and removal of the crankshaft are allowed only from the oil pump side.
Bearing head function
Oil pump Oil suction path (see Figure 4-5)
Pressure equalizer path (see Figure 4-2) Shaft seal (see Figure 4-3) Thrust load bearing (see Figure 4-4) Figure 4-1 Cross Section of WBH Series Compressor
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2200D3NE-WBH2006.3.
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Crankcase Cover plate
Gas flow
Gas flow
Figure 4-2 Gas Low-pressure Equalizer
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2200D3NE-WBH2006.3.
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A new, proven shaft seal in terms of K- and L-shaped sealing is incorporated into this system to assure a performance gain in the shaft seal.
Figure 4-3 Shaft Seal Table 4-1 Shaft Seal C
D
E
F
G
34 35
H
I
J
Shaft seal ring Drive collar ASSY O-ring (JIS B 2401 P110) O-ring (JIS W 1516 G19) Floating seat O-ring (JIS W 1516 G27)
37 39 41 42
K
J
D
1 1 set 1 1 1 2
*1: See “8.5 Parts List” in Chapter 8 Exploded View and Parts List on page 8-4 for part numbers.
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2200D3NE-WBH2006.3.
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The crankshaft is designed to shift to the oil pump side (left in the figure below) when a negative suction pressure is developed. If the suction pressure reaches a positive level, the crankshaft is shifted to the other side (right in the figure) that causes thrust loading indicated by the arrows in the figure. This system is configured to distribute and absorb thrust loads with the thrust bearing and main bearing. This modification enables the locknut securing the shaft seal collar (that is to position the crankshaft as well) of the WB Series to be eliminated from this series. Thrust bearing
Main bearing Crankshaft
Oil pump Load-bearing surface when suction pressure is smaller than 0 MPaG (negative pressure) Load-bearing surface when suction pressure is larger than 0 MPaG (positive pressure) Figure 4-4 Thrust Load Bearing
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2200D3NE-WBH2006.3.
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The oil suction path for the oil pump has undergone improvements. Figure 4-5 presents the crankcase in downward shaded lines and main bearing head in left-downward shaded lines. This system features a new oil suction path that allows the oil suction passages between the crankcase and main bearing head to be joined at the flange with the use of the gasket. This refinement improves sealing performance of the path.
Oil pump Main bearing head
Crankcase Oil flow
Oil strainer
Main bearing head gasket
Figure 4-5 Oil Pump Oil Suction Path
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