This non-provisional application is based on Japanese Patent Application No. 2014-066325 filed on Mar. 27, 2014 with the Japan Patent Office, the entire contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a compressor.
2. Description of the Background Art
A compressor includes a cylinder block, a front housing, a rear housing, and a valve-forming plate or the like. The valve-forming plate is interposed between the cylinder block and the rear housing. The cylinder block forms a compression chamber inside a cylinder bore. The rear housing forms a discharge chamber toward which a refrigerant compressed in the compression chamber is discharged, and an accommodation chamber accommodating a check valve therein and communicating with the discharge chamber through the check valve.
As disclosed in Japanese Patent Laying-Open No. 2000-346218, the compressor includes a discharge passage for delivering the refrigerant compressed in the compression chamber to an external device (a condenser, for example). In the compressor disclosed by the document, the valve-forming plate is formed by an intake valve, a valve plate, a discharge valve and a retainer, and the discharge passage is formed in the rear housing, the valve-forming plate and the cylinder block.
In the case where the discharge passage is formed in the rear housing, the valve-forming plate and the cylinder block, the valve-forming plate is provided with a communication hole functioning as a part of the discharge passage. The rear housing is provided with a passage for communicating the accommodation chamber accommodating the check valve therein with the communication hole formed in the valve-forming plate. The cylinder block is provided with a connection portion to be connected to an external device (a condenser, for example), and another passage for communicating the connection portion with the communication hole formed in the valve-forming plate.
Conventionally, it was difficult to increase flexibility in design of these passages. Specifically, in a conventional compressor, since the communication hole provided in the valve-forming plate has a small dimension (flow passage area), there is only limited installation range (such as the installation angle and the installation position) inside which these passages may communicate with the small communication hole.
An object of the present invention is to provide a compressor capable of achieving a high flexibility in designing a discharge passage.
SUMMARY OF THE INVENTION
A compressor which is provided with a compression chamber and a discharge passage and is configured to deliver a refrigerant compressed in the compression chamber to an external device through the discharge passage includes a cylinder block configured to form the compression chamber, a rear housing configured to form a discharge chamber toward which the refrigerant compressed in the compression chamber is discharged and an accommodation chamber accommodating a check valve therein and communicating with the discharge chamber through the check valve, and a valve-forming plate interposed between the cylinder block and the rear housing and including a communication hole which constitutes a part of the discharge passage. The rear housing includes a first passage extending from the accommodation chamber towards the communication hole of the valve-forming plate. The cylinder block includes a connection portion to be connected to the external device, an outlet space opening towards the connection portion, and a second passage extending from the outlet space towards the communication hole of the valve-forming plate. The discharge passage includes the discharge chamber, the accommodation chamber, the first passage, the communication hole, the second passage, and the outlet space. The flow passage area of the communication hole is larger than at least one of the flow passage area of the first passage and the flow passage area of the second passage.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view illustrating a compressor according to a first embodiment;
FIG. 2 is a sectional view illustrating an enlarged discharge valve and an enlarged discharge passage of the compressor according to the first embodiment;
FIG. 3 is a perspective view illustrating a cylinder block, a valve-forming plate and a rear housing of the compressor according to the first embodiment in an exploded state;
FIG. 4 is a bottom view schematically illustrating the compressor according to the first embodiment;
FIG. 5 is a bottom view for explaining the functions and effects of the compressor according to the first embodiment;
FIG. 6 is a sectional view illustrating an enlarged discharge passage of a compressor according to a second embodiment;
FIG. 7 is a sectional view illustrating an enlarged discharge passage of a compressor according to a third embodiment; and
FIG. 8 is a sectional view illustrating an enlarged discharge passage of a compressor according to a fourth embodiment.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Embodiments in accordance with the present invention will be described hereinafter with reference to the drawings. Unless otherwise specified, the scope of the present invention is not limited to the number, the amount or the like cited in the embodiments to be described below. The same components and corresponding components are assigned with the same reference numerals, and the description may not be repeated.
First Embodiment
(Compressor 100)
FIG. 1 is a sectional view illustrating a compressor 100 according to the first embodiment. The compressor 100 is a swash plate typed compressor having a variable capacity. To be described in detail hereinafter, the compressor 100 includes a compression chamber 1r and a discharge passage 6s, and is configured to deliver a refrigerant compressed in the compression chamber 1r to an external device (such as a condenser) through the discharge passage 6s. In the case where the compressor 100 is employed in a vehicular air conditioner for example, the compression chamber 1r is connected to the condenser through the discharge passage 6s, the condenser is connected to an evaporator through an expansion valve, and the evaporator is connected to a suction chamber (suction chamber 5a).
Specifically, the compressor 100 includes a cylinder block 1, a front housing 3, a rear housing 5 and a valve-forming plate 2. The front housing 3 is joined to the front end of the cylinder block 1, and the rear housing 5 is joined to the rear end of the cylinder block 1 through the valve-forming plate 2.
A plurality of cylinder bores lb are formed inside the cylinder block 1. The cylinder block 1 and the front housing 3 form a crank chamber 9. The cylinder block 1 has a shaft hole 1h, and the front housing 3 has a shaft hole 3h. The shaft holes 1h and 3h support a drive shaft 6 through the intermediary of a shaft-sealing units 9a and shaft-bearing units 9b and 9c. A pulley 6m is installed to the front housing 3 through a bearing device 3b. The pulley 6m is fixed to the drive shaft 6, and a belt 6n driven by a vehicular engine or motor is wound on the pulley 6m.
A lug plate 9f and a swash plate 7 are provided inside the crank chamber 9. The lug plate 9f is press-fitted to the drive shaft 6, and the drive shaft 6 is inserted into and penetrates the swash plate 7. Bearing units 9d and 9e are provided between the lug plate 9f and the front housing 3. An inclination angle-reducing spring 8a is provided between the lug plate 9f and the swash plate 7. The lug plate 9f and the swash plate 7 are connected together by a link mechanism 7c.
A circlip 6a is fixed to the drive shaft 6. A return spring 8b is provided between the circlip 6a and the swash plate 7. The plurality of cylinder bores 1b each houses therein one piston 1p. A pair of shoes 7a and 7b are provided between each piston 1p and the swash plate 7. The wobbling motion of the swash plate 7 is converted into the reciprocating movement of each piston 1p by the shoes 7a and 7b.
The valve-forming plate 2 is interposed between the rear end face of the cylinder block 1 and the front end surface of the rear housing 5. The cylinder bore 1b of the cylinder block 1 forms the compression chamber 1r between the piston 1p and the valve-forming plate 2. The valve-forming plate 2 includes an intake valve, a valve plate, a discharge valve, a retainer and the like, and has a substantially plate-like shape as a whole. To be described in detail hereinafter, the valve-forming plate 2 is provided with a discharge port 2p (see FIG. 2) and a suction port (not shown), and a peripheral part (a bulge portion 2t illustrated in FIG. 3) of the valve-forming plate 2 is formed with a communication hole 2h (see also FIG. 3) which constitutes a part of the discharge passage 6s.
A suction chamber 5a, a discharge chamber 5b, and an accommodation chamber 5c are formed inside the rear housing 5. The suction chamber 5a is in communication with the compression chamber 1r inside the cylinder bore 1b through a suction port (not shown) formed to penetrate through the valve-forming plate 2. The crank chamber 9 and the suction chamber 5a are connected together by a passage 4a. The crank chamber 9 and the discharge chamber 5b are connected together by passages 4b and 4c.
The rear housing 5 houses therein a capacity control valve 4g. The capacity control valve 4g is in communication with the passages 4b and 4c, and meanwhile is communication with the suction chamber 5a through the intermediary of a pressure detecting passage 4d. The capacity control valve 4g, based on a detected flow rate differential pressure or the like of the refrigerant gas in the pressure detecting passage 4d, controls the passage 4b and 4c to open or close. The high-pressure refrigerant gas in the discharge chamber 5b is supplied to the crank chamber 9 through the passages 4b and 4c. Adjusting the pressure in the crank chamber 9 to a desired value causes the inclination angle of the swash plate 7 to change, and thereby changes the discharge capacity to a desired one.
The discharge chamber 5b within the rear housing 5 is in communication with the compression chamber 1r inside the cylinder bore 1b through the discharge port 2p which is formed to penetrate through the valve-forming plate 2 (see FIG. 2). The accommodation chamber 5c is formed adjacent to the discharge chamber 5b and accommodates therein the check valve 10. The accommodation chamber 5c (specifically, a part of the accommodation chamber 5c located downstream than the check valve 10) communicates with the discharge chamber 5b through the check valve 10.
(Check Valve 10)
FIG. 2 is a sectional view illustrating the enlarged check valve 10 and the enlarged discharge passage 6s. The check valve 10 is provided with a valve seat 11, a valve body 12, a valve housing 13 and a spring 14, and is press-installed inside the accommodation chamber 5c. The valve seat 11 has a valve hole 11h. The valve body 12 is configured to close the valve hole 11h when being moved in the valve housing 13 along the direction towards the valve seat 11, and to open the valve hole 11h when being moved in the valve housing 13 along the direction away from the valve seat 11.
The valve housing 13 houses therein a spring 14 urging the valve body 12 towards the valve-closing direction. A side wall of the valve housing 13 is formed with a communication window 15. When the valve is opened, the refrigerant from the valve hole 11h flows into the accommodation chamber 5c (specifically, a part of the accommodation chamber 5c located downstream than the check valve 10) through the communication window 15.
(Discharge Passage 6s)
FIG. 3 is a perspective view illustrating the cylinder block 1, the valve-forming plate 2 and the rear housing 5 in an exploded state. The valve-forming plate 2 in FIG. 3 is illustrated as a single plate for the purpose of clarity and convenience in the drawing, and in fact, the valve-forming plate 2 includes the intake valve, the valve plate, the discharge valve, the retainer and the like (see FIG. 2).
(First Passage 5d and First Space 5e)
Referring to FIGS. 2 and 3, the rear housing 5 has an outer peripheral surface 5s. The rear housing 5 is provided with a bulge portion 5t bulging outward (radially outward). In the part where the bulge portion 5t is formed, the outer peripheral surface 5s of the rear housing 5 has a shape that bulges convexly outward (radially outward). In the other part where the bulge portion 5t is not formed, the outer peripheral surface 5s of the rear housing 5 has a cylindrical shape.
The bulge portion 5t constitutes a part of the rear housing 5, and is integrally formed with the part of the rear housing 5 that forms the discharge chamber 5b and the accommodation chamber 5c. A first passage 5d and a first space 5e are formed inside the bulge portion 5t. The part of the rear housing 5 that forms the discharge chamber 5b and the accommodation chamber 5c and the part of the rear housing 5 that forms the first passage 5d and the first space 5e are made of the same material (aluminum-based metal or the like).
The first passage 5d and the first space 5e communicate with each other, and the first space 5e is located at the downstream of the first passage 5d in the flowing direction of the refrigerant. The first passage 5d has for example a cylindrical shape, and extends towards a part where the communication hole 2h of the valve-forming plate 2 to be described later is formed. The upstream end m1 (see FIG. 2) of the first passage 5d opens towards the accommodation chamber 5c, and the downstream end m2 (see FIG. 2) of the first passage 5d opens towards the first space 5e.
The part of the rear housing 5 that forms the first space 5e has a bottomed cylindrical shape. The first space 5e is formed into a concave shape through a cutting process or the like performed on a part of an end face 5j (see FIG. 3) of the rear housing 5 that joins to the valve-forming plate 2. In the case where the rear housing 5, the valve-forming plate 2 and the like are in an exploded state (the state illustrated in FIG. 3), the first space 5e has an opening in the end face 5j. In the present embodiment, the first space 5e is formed into a substantially cubic space extending in the direction indicated by an arrow AR1 (see FIG. 3), and the flow passage area S2 of the first space 5e (see FIG. 2) is larger than the flow passage area S1 of the first passage 5d (see FIG. 2). The direction indicated by the arrow AR1 corresponds to the circumferential direction of the rear housing 5.
(Communication Hole 2h)
As illustrated in FIG. 3, the valve-forming plate 2 includes a disc portion 2s (circular portion) and a bulge portion 2t (another bulge portion) bulging outward (radially outward) from the outer peripheral edge of the disc portion 2s. In the part where the bulge portion 2t is formed, the outer peripheral edge of the valve-forming plate 2 has a shape that bulges convexly outward (radially outward). In the other part where the bulge portion 2t is not formed, the outer peripheral edge of the valve-forming plate 2 has a circular shape.
The communication hole 2h is formed inside the bulge portion 2t. In the present embodiment, the communication hole 2h is formed into a substantially cubic space extending in the direction indicated by an arrow AR2 (see FIG. 3). The direction indicated by the arrow AR2 corresponds to the circumferential direction of the valve-forming plate 2. The communication hole 2h and the first space 5e have substantially the same outer edge shape, and the flow passage area S3 of the communication hole 2h (see FIG. 2) is substantially the same as the flow passage area S2 of the first space 5e (see FIG. 2). In other words, the flow passage area S3 of the communication hole 2h is larger than the flow passage area S1 of the first passage 5d.
(Second Space 1c, Second Passage 1d and Outlet Space 1e)
Referring to FIGS. 2 and 3, the cylinder block 1 has an outer peripheral surface 1s. The cylinder block 1 is provided with a bulge portion 1t that bulges outward (radially outward) and a bulge portion 1u that bulges outward further than the bulge portion 1t. In the part where the bulge portions 1t and 1u are formed, the outer peripheral surface 1s of the cylinder block 1 has a shape that bulges convexly outward (radially outward). In the other part where the bulge portions 1t and 1u are not formed, the outer peripheral surface 1s of the cylinder block 1 has a cylindrical shape.
The bulge portions 1t and 1u constitute a part of the cylinder block 1, and are integrally formed with the part of the cylinder block 1 that forms the cylinder bores 1b. A second space 1c and a second passage 1d are formed inside the bulge portion 1t of the cylinder block 1. An outlet space 1e is formed inside the bulge portion 1u. The part of the cylinder block 1 that forms the cylinder bores 1b and the part of the cylinder block 1 that forms the second space 1c, the second passage 1d and the outlet space 1e are made of the same material (aluminum-based metal or the like).
The second space 1c, the second passage 1d and the outlet space 1e communicate with each other. In the flowing direction of the refrigerant, the second space 1c is located at the upstream of the second passage 1d, and the outlet space 1e is located at the downstream of the second passage 1d. The second passage 1d and the outlet space 1e each has for example a cylindrical shape. The second passage 1d extends from the outlet space 1e towards the part of the valve-forming plate 2 where the communication hole 2h is formed. The upstream end n1 (see FIG. 2) of the second passage 1d opens towards the second space 1c, and the downstream end n2 (see FIG. 2) of the second passage 1d opens towards the outlet space 1e. The downstream end of the outlet space 1e opens towards a connection portion 1f. The connection portion 1f is a site to be connected to an external device 20 (see FIG. 2) such as a condenser.
The part of the cylinder block 1 that forms the second space 1c has a bottomed cylindrical shape. The second space 1c is formed into a concave shape through a cutting process or the like performed on a part of an end face 1j (see FIG. 3) of the cylinder block 1 that joins to the valve-forming plate 2. In the case where the cylinder block 1, the valve-forming plate 2 and the like are in an exploded state (the state illustrated in FIG. 3), the second space 1c has an opening in the end face 1j. In the present embodiment, the second space 1c is formed into a substantially cubic space extending in the direction indicated by an arrow AR3 (see FIG. 3), and the flow passage area S4 of the second space 1c (see FIG. 2) is larger than the flow passage area S5 of the second passage 1d (see FIG. 2). The direction indicated by the arrow AR3 corresponds to the circumferential direction of the cylinder block 1. In the present embodiment, the flow passage area S4 of the second space 1c (see FIG. 2) is substantially the same as the flow area S3 of the communication hole 2h (see FIG. 2). In other words, the flow passage area S3 of the communication hole 2h is larger than the flow passage area S5 of the second passage 1d.
The part of the cylinder block 1 that forms the outlet space 1e also has a bottomed cylindrical shape. The outlet space 1e is formed into a concave shape through a cutting process or the like performed on a part of the end face of the cylinder block 1 that forms the connection portion 1f. In a state where the external device 20 is detached (through detaching a connection pipe or the like) from the connection portion 1f, the outlet space 1e has an opening in the connection portion 1f. In the present embodiment, the outlet space 1e is formed into a substantially cylindrical space, and the flow passage area S6 of the outlet space 1e (see FIG. 2) is larger than the flow passage area S5 of the second passage 1d (see FIG. 2).
Referring again to FIGS. 1 and 2, the discharge passage 6s in the present embodiment includes the discharge chamber 5b, the accommodation chamber 5c, the first passage 5d, the first space 5e, the communication hole 2h, the second space 1c, the second passages 1d, and the outlet space 1e. The compressor 100 is configured to deliver the refrigerant compressed in the compression chamber 1r to an external device (such as a condenser) through the discharge passage 6s, and thereby it can function as for example a part of the refrigerant circuit.
(Functions and Effects)
FIG. 4 is a bottom view schematically illustrating the compressor 100, and the compressor 100 is illustrated as being viewed from the side of the rear housing 5. The external device 20 such as a condenser or the like is connected to the connection portion 1f of the compressor 100 through a connection pipe. The position to dispose the external device 20 may be changed according to, for example, the specifications of the external device 20 and/or the specifications of a vehicle where the compressor 100 and the external device 20 are mounted. Since it is possible for the compressor 100 of the present embodiment to achieve a high flexibility in designing the discharge passage 6s, it can flexibly cope with the changes in the abovementioned specifications, which will be described in detail hereinafter.
As described in the above, the flow passage area S3 of the communication hole 2h (see FIG. 2) provided in the valve-forming plate 2 is larger than the flow passage area S1 of the first passage 5d (see FIG. 2) provided in the rear housing 5. As illustrated in FIG. 4, when providing the first passage 5d in the rear housing 5, the downstream end m2 of the first passage 5d (see also FIG. 2) can be freely positioned within the range indicated by an arrow DR1. Even though the downstream end m2 of the first passage 5d is positioned within the range indicated by the arrow DR1, as long as the downstream end m2 of the first passage 5d is opened towards the communication hole 2h, it is possible for the first passage 5d to communicate the accommodation chamber 5c with the communication hole 2h. Therefore, since the downstream end m2 of the first passage 5d can be freely positioned within the range indicated by the arrow DR1, the installation range (such as the installation angle and the installation position) of the first passage 5d for communicating with the communication hole 2h can be widened, and thereby it is possible to achieve a high flexibility in designing the discharge passage 6s.
Similarly, the flow passage area S3 of the communication hole 2h (see FIG. 2) provided in the valve-forming plate 2 is larger than the flow passage area S5 of the second passage 1d (see FIG. 2) provided in the bulge portion 1t of the cylinder block 1. As illustrated in FIG. 4, when providing the second passage 1d in the cylinder block 1, the upstream end n1 of the second passage 1d (see also FIG. 2) can be freely positioned within the range indicated by an arrow DR2. Even though the upstream end n1 of the second passage 1d is positioned within the range indicated by the arrow DR2, as long as the upstream end n1 of the second passage 1d is opened towards the communication hole 2h, it is possible for the second passage 1d to communicate the communication hole 2h with the outlet space 1e (connection portion 1f). Therefore, since the upstream end n1 of the second passage 1d can be freely positioned within the range indicated by the arrow DR2, the installation range (such as the installation angle and the installation position) of the second passage 1d for communicating with the communication hole 2h can be widened, and thereby it is possible to achieve a high flexibility in designing the discharge passage 6s.
In the present embodiment, the flow passage area S6 of the outlet space 1e (see FIG. 2) is larger than the flow passage area S5 of the second passage 1d (see FIG. 2). As illustrated in FIG. 4, when providing the second passage 1d in the cylinder block 1, the downstream end n2 of the second passage 1d (see also FIG. 2) can be freely positioned within the range indicated by an arrow DR3. Even though the downstream end n2 of the second passage 1d is positioned within the range indicated by the arrow DR3, as long as the downstream end n2 of the second passage 1d is opened towards the outlet space 1e, it is possible for the second passage 1d to communicate the communication hole 2h with the outlet space 1e (connection portion 1f). Therefore, since the downstream end n2 of the second passage 1d can be freely positioned within the range indicated by the arrow DR3, the installation range (such as the installation angle and the installation position) of the second passage 1d for communicating with the communication hole 2h can be widened, and thereby it is possible to achieve a high flexibility in designing the discharge passage 6s.
As illustrated in FIG. 5, for example, even in the case where it is necessary to change the position of the connection portion 1f along direction indicated by an arrow DR4, it is possible for the rear housing 5 and the valve-forming plate 2 (not shown) to share a common structure illustrated in FIG. 4. Similarly, even in the case where it is necessary to change the position of the accommodation chamber 5c in accordance with the specifications of the rear housing 5, it is possible for the cylinder block 1 and the valve-forming plate 2 (not shown) to share a common structure illustrated in FIG. 4. Therefore, the adoption of the ideas contained in the compressor 100 improves the versatility of components, which thereby makes it possible to reduce the manufacturing cost.
In the present embodiment, the first space 5e (see FIG. 2) is provided between the communication hole 2h and the first passage 5d. The flow passage area S2 of the first space 5e (see FIG. 2) is larger than the flow passage area Si of the first passage 5d (see FIG. 2). The refrigerant contracts and expands when passing through the accommodation chamber 5c, the first passage 5d and the first space 5e. Thus, the accommodation chamber 5c, the first passage 5d and the first space 5e can function as a muffler chamber.
In the present embodiment, the second space 1c (see FIG. 2) is provided between the communication hole 2h and the second passage 1d, and the outlet space 1e (see FIG. 2) is provided between the connection portion 1f and the second passage 1d. The flow passage area S4 of the second space 1c (see FIG. 2) is larger than the flow passage area S5 of the second passage 1d (see FIG. 2). The flow passage area S6 of the outlet space 1e (see FIG. 2) is larger than the flow passage area S5 of the second passage 1d (see FIG. 2). The refrigerant contracts and expands when passing through the second space 1c, the second passage 1d and the outlet space 1e. Thus, the second space 1c, the second passage 1d and the outlet space 1e can function as a muffler chamber.
In the present embodiment, the compressor 100 is provided with a bulge portion (bulge portion 1t, 2t and/or 5t) that bulges outward, and the communication hole 2h provided in the valve-forming plate 2 is located within the bulge portion. The bulge portion 1t is formed integral with the cylinder block 1, and the bulge portion 5t is formed integral with the rear housing 5. According to this configuration, compared with the case where a member is provided separately so as to join the bulge portion to the cylinder block 1 and/or the rear housing 5, it is possible to reduce the manufacturing cost.
Second Embodiment
In a compressor 101 illustrated in FIG. 6, the first space 5e (see FIG. 2) is not formed in the rear housing 5, and the second space 1c (see FIG. 2) is not formed in the cylinder block 1. The first passage 5d formed in the rear housing 5 is in direct communication with the communication hole 2h of the valve-forming plate 2, and second passage 1d formed in the cylinder block 1 is also in direct communication with the communication hole 2h of the valve-forming plate 2.
In the compressor 101, the flow passage area S3 of the communication hole 2h is larger than the flow passage area S1 of the first passage 5d, and the flow passage area S3 of the communication hole 2h is also larger than the flow passage area S5 of the second passage 1d. According to this configuration, since the installation range (such as the installation angle and the installation position) for communicating the first passage 5d and the second passage 1d with the communication hole 2h can be widened, it is possible to achieve a high flexibility in designing the discharge passage 6s. In addition to the configuration of the second embodiment, similar to the first embodiment, the first space 5e may be formed in the rear housing 5. In addition to the configuration of the second embodiment, similar to the first embodiment, the second space 1c may be formed in the cylinder block 1.
Third Embodiment
In a compressor 102 illustrated in FIG. 7, the flow passage area S3 of the communication hole 2h is not configured as being larger than the flow passage area S5 of the second passage 1d. However, the flow passage area S3 of the communication hole 2h is configured as being larger than the flow passage area S1 of the first passage 5d. According to this configuration, since the installation range (such as the installation angle and the installation position) for communicating the first passage 5d with the communication hole 2h can be widened, it is possible to achieve a high flexibility in designing the discharge passage 6s.
Fourth Embodiment
In a compressor 103 illustrated in FIG. 8, the flow passage area S3 of the communication hole 2h is not configured as being larger than the flow passage area S1 of the first passage 5d. However, the flow passage area S3 of the communication hole 2h is configured as being larger than the flow passage area S5 of the second passage 1d. According to this configuration, since the installation range (such as the installation angle and the installation position) for communicating the second passage 1d with the communication hole 2h can be widened, it is possible to achieve a high flexibility in designing the discharge passage 6s.
Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the scope of the present invention being interpreted by the terms of the appended claims.
Patent Application
20150275885
