Rotary expansible chamber devices – Combined
Reexamination Certificate
1999-04-29
2001-12-18
Vrablik, John J. (Department: 3748)
Rotary expansible chamber devices
Combined
C418S201100
Reexamination Certificate
active
06331103
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fluid machine as a compressor to be used for a super charger of a vehicle, for example.
2. Description of Related Art
There has been disclosed in Japanese Patent Application Laid-Open No. 54-54309 (1979) “a silencing apparatus
201
of a positive-displacement fluid machine” as shown in FIG.
1
. This silencing apparatus
201
is disposed at a discharge opening
205
of a screw-type compressor
203
, and the silencing apparatus
201
is configured by uniting an expansion silencer
207
and a sound absorbing silencer
209
.
The expansion silencer
207
is composed of a reflecting plate
211
and a pipe
213
which pierces through the reflecting plate
211
. The sound absorbing silencer
209
is constituted so that a sound absorbing material
217
is provided to an inner wall of a casing
215
.
A pressure pulsation of a discharge gas of the compressor
203
is reduced in the expansion silencer
207
by interference of a pressure component reflected from the reflecting plate
211
and a pressure component passing through the pipe
213
, and further a pulsation pressure is reduced by the sound absorbing material
217
of the sound absorbing silencer
209
l so that the noise is silenced.
In addition, there has been disclosed in Japanese Utility Model Application Laid-Open No. 6-80026 (1994) “a compressor
219
” as shown in
FIG. 2
, and in Japanese Utility Model Application Laid-Open No. 5-47373 (1993) “a mechanical supercharger
221
” as shown in FIG.
3
.
The compressor
219
and mechanical supercharger
221
are, similarly to the fluid machine of
FIG. 1
, screw-type compressors, and their driving forces are increased by speed increasing gear sets
223
and
255
so that rotors
231
,
233
,
235
and
237
are rotated synchronously via timing gear sets
227
and
229
.
Gases inhaled from intake openings
239
and
241
are compressed between the rotors
231
,
233
,
235
and
237
and rotor chambers
243
and
245
so as to be discharged from discharge openings
247
and
249
.
In the case of the compressor
219
, because of necessity when the rotors
231
and
233
are mounted, an intake casing
251
which is provided with the intake opening 239 is formed separately from a main body section
253
provided with the rotor chamber
243
. The intake opening
239
is provided so as to be right-angled with an axial direction of the rotors
231
and
233
.
In the case of the mechanical supercharger
221
, the intake opening
241
is provided so as to be substantially parallel with an axial direction of the rotors
235
and
237
. Similarly to the compressor
219
, in order to mount the rotors
235
and
237
, the intake opening
241
is formed separately from a rotor chamber
245
.
As mentioned above, the silencing apparatus
201
shown in
FIG. 1
is mounted to an outside of the compressor
203
, and it is large-sized so as not to lower an inlet efficiency. In the above-mentioned conventional fluid machines, there arises a serious problem of noises, and thus a large-sized silencer such as the silencing apparatus
201
is used in order not to lower the inlet efficiency. Such a large-sized silencer cannot be mounted internally, so it is mounted externally like the silencing apparatus
201
.
In addition, when an equipment for a vehicle, for example, should be compact, a special silencer is used, but such a silencer has a complicated structure and is expensive.
Furthermore, since at the intake opening
241
ends other than discharging opening ends, there also arises noises, it is desirable to provide with silencing means on the intake opening
241
ends. However, depending upon restriction of space in the engine room of the vehicle, it is difficult to provide with the silencing means on the intake opening
241
ends in such a manner that the silencing means would be provided independently from the fluid machine.
SUMMARY OF THE INVENTION
The present invention has been achieved with such points in mind.
It therefore is an object of the present invention to provide a fluid machine having silencing means which is small-sized, light, cheap, and does not greatly influence an inlet efficiency.
It is another object of the present invention to provide a fluid machine of which the silencing means can be provided at least one of an existing space forming fluid channel on the intake opening side and an existing space forming a fluid channel on the discharge opening side, and which is not required with independent space.
To achieve the object, according to a first aspect of the present invention, there is provided a fluid machine of a first aspect comprises: a casing having an operating chamber provided in the casing; a pair of rotors rotatably mounted in the operating chamber, each rotors having each rotor shaft in each axial direction; an intake opening and discharge opening for fluid, the intake opening and discharge opening being connected with the operating chamber, respectively; and silencing means provided in at least one of an existing space forming fluid channel on the intake opening side and an existing space forming a fluid channel on the discharge opening side, wherein the existing spaces are located between the intake opening and the operating chamber and between the discharge opening and the operating chamber, respectively; and wherein at least one among the intake opening and the discharge opening of the fluid where the silencing means is disposed is provided so as to be at parallel with the rotor shafts.
In the fluid machine of the present invention, the silencing means, which is provided in at least one of the spaces forming the fluid channel on the intake opening side and discharge opening side, reduces a pulsation pressure of the fluid and quietness is improved.
In addition, since the spaces on the intake opening side and discharge opening side where the silencing means is provided exist in the fluid machine and have a large sectional area, there is no great influence upon an efficiency, and thus the efficiency and silencing effect are compatible with each other.
Further, since the existing spaces are utilized for providing the silencing means, over- sizing of the fluid machine due to the disposal of the silencing means can be prevented.
Moreover, since special silencing means is not required, a system utilizing the fluid machine can be constituted at low cost.
Further, in the structure that the intake opening and discharge opening of the fluid are disposed substantially parallel with the rotor shafts, since the fluid moves smoothly, the efficiency of the fluid machine is improved.
The invention of a second aspect provides the fluid machine of the first aspect, wherein the silencing means is composed of a plate member and one or plural orifice(s) which is (are) formed in the plate member.
In the structure where the orifices are used in the silencing means, the pulsation pressure is reduced by viscous resistance due to contraction and expansion occurring when the fluid passes through the orifices, and thus the quietness is improved.
Further, a number and diameter of the orifices and a thickness of the plate member (length of the orifices) can be selected desirably according to a frequency of a noise to be silenced, and thus the silencing effect can be improved greatly.
In addition, since the silencing means using the orifices has a particularly simple structure, its cost is low.
The invention of a third aspect provides the fluid machine of the second aspect, wherein the plate member is a flat plate disposed to be at substantially right angle to the flow of the fluid.
In addition, since the flat plate is used as the plate member, the plate member is processed easily, and thus the cost becomes low. Moreover, since the orifices are easily processed in the flat plate, the cost can be further reduced.
The invention of a fourth aspect provides the fluid machine of the second aspect, wherein the plate member is formed into a convex shape or concave shape with respect to the flow of the fluid.
In add
Morrison & Foerster
Tochigi Fuji Sangyo Kabushiki Kaisha
Vrablik John J.
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