JP2010127208A - Fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small, lightweight and highly efficient fluid machine having a novel mechanism having both merits of scroll type and rotary type mechanisms. <P>SOLUTION: This fluid machine has a fixed side member having a fixed spiral wall, and a movable side member having a movable spiral wall for engaging with the fixed spiral wall, having a cylindrical wall in an axial directional position different from the movable spiral wall and driven to swing by a main shaft having a crankshaft part, and is characterized in that a scroll type volume changing part is formed between both spiral walls, and a rotary type volume changing part is formed between an outer peripheral surface of the cylindrical wall of the movable side member and an inner peripheral surface of a fixed housing for storing the movable side member, and both volume changing parts are communicably constituted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a volume-changing fluid machine, and more particularly to a fluid machine having a novel structure that has the advantages of a scroll type and a rotary type.

  Both scroll and rotary fluid machines are well known, including both compressors and expanders. For example, a scroll compressor is usually compressed by a spiral wall of about 2.5 turns, but the torque fluctuation is small and the differential pressure between adjacent compression chambers during compression is small, so the blow-by is small and high efficiency. It is. On the other hand, the rotary type compressor is suitable when the structure is simple and a reduction in size and weight is required. In addition, neither the scroll-type compressor nor the rotary-type compressor has a suction valve and is suitable for high-speed rotation as compared with a piston-type compressor.

In connection with the present invention, compression is performed once in a space surrounded by the inner periphery of the cylinder, the outer periphery of the movable school, and the sliding vane, and as a result, the pressurized gas is guided to the scroll spiral part and compressed again by the scroll spiral part. There is known a scroll type compressor capable of operating at a high compression ratio (Patent Document 1).
Japanese Patent No. 3286455

A scroll compressor and a rotary compressor each have the above-mentioned advantages, but also have the following disadvantages.
That is, in the scroll compressor, the volume (capacity) is determined by the height of the spiral wall and the length in the spiral direction. In order to increase the capacity, it is necessary to increase the height of the spiral wall or extend the spiral wall to the outer peripheral side. However, since the spiral wall itself is a cantilever structure supported by a flat plate (bottom plate), the spiral wall When increasing the height of the wall, the stress applied to the base of the spiral wall increases, so the durability deteriorates accordingly, or a high-strength material is required to prevent it, and the material cost increases, It is subject to molding restrictions such as casting and forging.

  On the other hand, in the case of a rotary compressor, the axial force applied to the rotor is canceled out and there is basically no load on the thrust bearing. Leakage was easy to occur, and torque fluctuation was large. When the torque fluctuation is large, for example, when used in a vehicle air conditioner, it may cause a deterioration in drivability of the vehicle. Further, in a low speed region where the sliding contact between the vane and the housing is insufficient, there is a problem that sufficient performance is difficult to obtain, low efficiency, and abnormal noise is easily generated. In particular, a fluid machine mounted on a vehicle is required to have characteristics of small size, high efficiency, and low noise in addition to high durability.

  In this regard, the scroll compressor described in the above-mentioned Patent Document 1 seems to have a structure combining a scroll type and a rotary type compression mechanism, but it does not necessarily have the advantages of both compression mechanisms. Not in. That is, the scroll compressor described in Patent Document 1 aims at reducing valve sound and improving durability in a refrigeration unit having a high compression ratio (about 10 to 20). A two-stage compression mechanism is used in which the compressed fluid is compressed again by the scroll unit. If each compression unit is viewed, the above-described problems of each compression unit have not been solved at all. . Further, this Patent Document 1 does not show any configuration for preventing rotation of the movable scroll.

  Considering the advantages and disadvantages of the scroll type and rotary type mechanisms described above, the object of the present invention is a small and light weight equipped with a novel mechanism optimally combined so that the advantages of both mechanisms can be utilized in the volume change operation itself. Another object is to provide a highly efficient fluid machine in terms of power consumption.

  In order to solve the above-described problems, a fluid machine according to the present invention includes a stationary member having a fixed spiral wall, a movable spiral wall that engages with the fixed spiral wall, and an axial position different from the movable spiral wall. And a movable side member that is pivotally driven by a main shaft having a crankshaft portion, forming a scroll-type volume changing portion between the spiral walls, and an outer periphery of the cylindrical wall of the movable side member A rotary type volume change portion is formed between the surface and the inner peripheral surface of the fixed housing that accommodates the movable side member, and the both volume change portions are configured to communicate with each other.

  In such a fluid machine according to the present invention, both the scroll-type volume change unit and the rotary-type volume change unit can perform the volume change operation on the sucked fluid, and the volume change efficiency can be improved. It becomes possible to greatly increase. By cooperating both volume change parts, while taking advantage of the scroll type volume change part with a long volume change process of about 2.5 revolutions and small torque fluctuations, the overall capacity can be shared by both volume change parts, In order to secure a desired capacity, the rotary type volume changer can compensate for the disadvantages of the scroll type volume changer alone. Further, a rotary type volume change part is formed between the cylindrical wall of the movable side member itself and the fixed housing. However, even if this rotary type volume change part is slightly longer in the axial direction, there is no portion where stress is increased. A large volume change capacity can be easily secured. Since a relatively large capacity can be secured on the rotary type volume changer side, it is not necessary to increase the capacity of the scroll type volume change part so much that the desired capacity is ensured as a whole and the fluid machine is reduced in size and weight. It becomes possible. And since the capacity | capacitance of a scroll type volume change part may be comparatively small, it is not necessary to make the height of a spiral wall so high, and it can avoid easily that the stress concerning the root of a spiral wall becomes high.

  In the fluid machine according to the present invention, the movable side member extends radially outward from the cylindrical wall and engages with the fixed housing side, thereby allowing the movable side member to swing. It is possible to employ a configuration having a swinging allowance / rotation preventing portion for preventing rotation. This rocking allowance / rotation prevention portion can be constituted by a member extending in a flat plate shape radially outward from the cylindrical wall, for example, a flat plate member formed integrally with the cylindrical wall. As the structure of this portion, for example, a rotating body space having an axis parallel to the main shaft is formed in the fixed housing, and the swing allowance / spinning prevention portion is slidable in the rotating body space. The rotating body to hold | maintain can take the structure fitted so that rotation was possible. The rotating body has a pair of two columnar shoes each having an arc surface and a flat bottom surface, and is configured to slidably hold the swing allowance / spinning prevention portion between the opposed flat bottom surfaces. You can adopt things. With such a configuration, the swing allowance / spinning prevention unit is held slidably with respect to the rotating body while being held swingably via the rotating body, thereby preventing the rotation of the movable side member. However, it is possible to perform a turning motion while ensuring the necessary operations for the scroll-type volume changing portion and the rotary-type volume changing portion of the movable member.

  A mechanism for transmitting a driving force for turning is connected to the movable side member, and in order to cause both the scroll type volume changing unit and the rotary type volume changing unit to perform a predetermined operation, an axial direction Movement needs to be regulated. In addition, it is desired that the mechanism for these operations be made as compact as possible in order to reduce the size and weight of the entire fluid machine while ensuring these operations. In order to satisfy such a demand, it is preferable that a bearing for transmitting a driving force for turning the movable side member is provided inside the cylindrical wall of the movable side member. With this configuration, the axial dimension can be kept small. Further, it is preferable that a balance weight capable of offsetting the centrifugal force of the movable side member is provided inside the cylindrical wall of the movable side member. With this configuration, the centrifugal force of the movable side member can be canceled efficiently while being a compact configuration, and a smoother operation of the movable side member is ensured. Further, the movable side member can adopt a structure in which the position in the main axis direction is regulated by sliding between the end surface of the cylindrical wall and the corresponding member of the end surface of the movable spiral wall. More specifically, a configuration in which the crankshaft portion of the main shaft is supported by the front housing, and the end surface of the cylindrical wall of the movable side member is slid on the end surface of the front housing, the movable side A configuration in which the end face of the movable spiral wall of the member is slid with the fixed member can be employed. With such a configuration, the movable side member is positioned at a predetermined position in the axial direction including the cylindrical wall and the movable spiral wall.

  In the fluid machine according to the present invention, the fixed housing may be formed integrally with the fixed side member. Of course, it is also possible to form these members separately and connect them in a predetermined positional relationship.

  Further, in the fluid machine according to the present invention, a cylinder head that forms a discharge chamber is connected to the fixed side member, and the rocking allowance is received from an oil storage chamber that stores lubricating oil formed in the cylinder head. / It is possible to adopt a configuration in which a guide path for lubricating oil is provided toward the rotation prevention portion, and this configuration is particularly suitable when the fluid machine is a compressor. With such a configuration, it becomes possible to appropriately lubricate the rocking allowance / spinning prevention unit using the lubricating oil stored in the fluid machine, and the stable operation of the rocking allowance / spinning prevention unit is always stable. Can be maintained.

  In the fluid machine according to the present invention, at least one first through-hole communicating the two volume changing portions and the first external circuit is provided on the outer peripheral surface of the fluid machine, and the scroll volume change It can be set as the structure which has a 2nd communicating hole which connects this scroll type volume change part to a 2nd external circuit in the center part of a part. When the fluid machine is a compressor, the first communication hole is a suction hole and the second communication hole is a discharge hole. When the fluid machine is an expander, the first communication hole is a discharge hole, and the second communication hole is a suction hole.

  Further, in the fluid machine according to the present invention, a wall step is provided at a partial position in the spiral direction of at least one of the spiral walls, and the inner space and the outer space are intermittently coupled to or from the wall step. It can be set as the structure comprised so that isolation | separation was possible. With such a configuration, it becomes possible to appropriately and naturally control the communication between the rotary type volume change unit and the scroll type volume change unit, and the communication interruption, and the volume change operation in each volume change unit is more preferable. It becomes possible to maintain the operating state.

  Moreover, it can be set as the structure by which the communicating path which can connect or isolate | separate the space inside and the space outside this part intermittently is formed in the partial position in the spiral direction of the fixed spiral wall. With such a configuration, the rotary type volume changing unit and the scroll type volume changing unit are connected to each other via the communication path in most of the operation of the fluid machine, and are connected at an appropriate timing, for example, the rotary type It becomes possible to isolate | separate and isolate | separate both communication at a certain suitable timing in 1 rotation of a type | mold volume change part. Also with such a configuration, it is possible to maintain the volume changing operation in each volume changing unit in a more preferable operating state.

  Such a fluid machine according to the present invention can be applied to both a compressor and an expander. It may be considered that the compressor and the expander simply have the suction and discharge paths of the target fluid reversed. In addition, such a fluid machine according to the present invention is particularly suitable as a fluid machine for mounting on a vehicle that is required to be small and light, have high durability, suppress torque fluctuations, maintain a stable operating state over a long period of time, and the like. It is a thing.

  As described above, according to the fluid machine according to the present invention, the structure of the rotary type volume changing portion formed by the cylindrical wall and the fixed housing does not have a portion where the stress increases even if it is somewhat longer in the axial direction. Combined so that the volume change section and the scroll type volume change section with a long volume change process of about 2.5 rotations and small torque fluctuations can work together, it is compact and lightweight while taking advantage of both volume change parts. It is possible to realize a highly efficient fluid machine that requires less fluctuation and requires less power.

  More specifically, as the scroll type volume change portion, the bottom plate diameter of the spiral body may be small, the thrust load that is the sum of the product of the area and the pressure in the compression chamber surrounded by the spiral wall is small, and the power consumption is small. The power consumption of the entire machine can be reduced. Further, the height of the spiral wall is low, casting or the like can be applied, the width of the manufacturing method is widened, and the cost can be reduced.

  Thus, the present invention can be applied to both a compressor and an expander, and a small and lightweight fluid machine can be provided. In particular, it is suitable for a compressor having a high compression ratio and an expander having a high expansion ratio. Especially when used as a compressor for vehicle air conditioning, it can take advantage of its small size and light weight. For example, FF vehicles generally have a horizontally mounted engine. Although it is difficult, since the dimension in the width direction can be reduced in the compressor according to the present invention, for example, a small compressor in which a clearance can be secured easily for collision safety is obtained.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Although the fluid machine according to the present invention can be applied to both a compressor and an expander, the embodiment will be described particularly in the case where the present invention is applied to a compressor.

  1 to 5 show a fluid machine according to an embodiment of the present invention, and particularly show a case where the present invention is applied to a compressor. 1 and 2, the compressor 1 includes a fixed side member 4 erected on a fixed spiral side bottom plate 3 and a movable spiral wall 5 engaged with the fixed spiral wall 2. 6 and a movable side member 8 having a cylindrical wall 7 at an axial position different from that of the movable spiral wall 5. The movable side member 8 is driven to rotate by a main shaft 10 having a crankshaft portion 9. A scroll-type volume changing portion 11 is formed between the spiral walls 2 and 5, and is between the outer peripheral surface of the cylindrical wall 7 of the movable side member 8 and the inner peripheral surface of the fixed housing 12 that houses the movable side member 8. A rotary type volume changing portion 13 is formed. Both volume change parts 11 and 13 are constituted so that communication is possible mutually. In this embodiment, the fixed housing 12 is formed integrally with the fixed member 4 having the fixed spiral wall 2.

  In the scroll-type volume changing portion 11, the fluid pocket formed between the fixed spiral wall 2 and the movable spiral wall 5 is moved to the central portion of the spiral wall as the movable side member 8 rotates. And the compression operation is performed. The compressed fluid passes through a discharge hole 14 serving as a second communication hole that is provided in the center of the scroll-type volume changing unit 11 so as to penetrate the fixed spiral side bottom plate 3 and communicates with a second external circuit. Then, the ink is discharged into the discharge chamber 16 formed in the cylinder head 15, and is sent from there to the second external circuit through the discharge port 17. The fluid is sucked into the scroll volume changing unit 11 from the suction chamber 18 located on the outer periphery of the spiral wall. The cylinder head 15 is connected to the integrated member 19 of the fixed housing 12 and the fixed side member 4 by being fastened to the through bolt 21 together with the front housing 20.

  A driving force is transmitted to the pulley 22 from a vehicle engine (not shown) as an external driving source via a belt or the like, and a rotational driving force is transmitted to the main shaft 10 via the electromagnetic clutch 23 from there. The large diameter portion 24 in the crankshaft portion 9 is rotatably supported by the front housing 20 via a bearing 25. An eccentric pin 26 protruding from the large-diameter portion 24 is fitted into an eccentric rotation roller 27 so as to be relatively rotatable. The eccentric rotation roller 27 is inserted into the cylindrical wall 7 of the movable member 8 via a bearing 28. It is arranged inward. Due to the rotation of the crankshaft portion 9 of the main shaft 10, the movable side member 8 is turned via the eccentric pin 26 and the eccentric rotation roller 27.

  On the outer peripheral surface of the cylindrical wall 7 of the movable side member 8, as shown also in FIGS. 3 and 4, by extending radially outward from the cylindrical wall 7 and engaging the fixed housing 12 side, There is provided a flat plate-like rocking allowance / rotation preventing portion 29 that allows the movable member 8 to swing but prevents rotation. In this embodiment, the swing allowance / spinning prevention portion 29 is formed integrally with the cylindrical wall 7 of the movable member 8. The swing allowing / spinning preventing portion 29 is slidably held by a rotating body that is formed in the fixed housing 12 and is rotatably provided in a rotating body space 30 having an axis parallel to the main shaft 10. Yes. In this embodiment, the rotating body is composed of a pair of columnar shoes 31 having a circular arc surface and a flat bottom surface, and a swing allowing / spinning prevention portion 29 is provided between the flat bottom surfaces of the two columnar shoes 31 facing each other. It is slidably held. With this configuration, the swing permitting / rotation preventing portion 29 is slidably held with respect to the columnar shoe 31 as the rotating body while being held slidably via the columnar shoe 31 as the rotating body. Thus, the turning movement of the movable side member 8 can be prevented while preventing the rotation of the movable side member 8, and the necessary compression operation of the scroll type volume changing portion 11 and the rotary type volume changing portion 13 by the movable side member 8 is ensured. It has become. 3 and 4, reference numeral 32 denotes an intake port that can communicate with both the scroll-type volume changing unit 11 and the rotary-type volume changing unit 13.

  In the present embodiment, the inner space and the outer space are intermittently coupled or separated to a part of the fixed spiral wall 2 in the spiral direction of the fixed member 4, particularly to the outer peripheral portion. Possible communication passages 33 extending in the radial direction are formed. The communication path 33 connects the rotary type volume change unit 13 and the scroll type volume change unit 11 by connecting the rotary type volume change unit 13 and the scroll type volume change unit 11 via the communication path 33 in most of the operations of the compressor 1. Can be separated by blocking. Further, a wall step is provided at a part of at least one of the spiral walls in the spiral direction. In the illustrated examples of FIGS. 3 and 4, a wall step 34 is provided at one portion of the movable spiral wall 5 and the bottom of the fixed spiral wall 2. A wall step 35 is provided at one portion of the wall 3 part, and the inner space and the outer space are configured to be intermittently coupled or separated from the wall step. Also with this configuration, it is possible to appropriately and naturally control the communication between the rotary type volume changing unit 13 side and the scroll type volume changing unit 11 side.

  Further, in the present embodiment, as shown in FIG. 1, a balance weight 36 that can cancel the centrifugal force generated by the turning motion of the movable side member 8 is provided inside the cylindrical wall 7 of the movable side member 8. Is provided. By arranging the balance weight 36 inward of the cylindrical wall 7, the centrifugal force of the movable side member 8 is efficiently canceled by a compact configuration, and a smoother operation of the movable side member 8 is ensured. The movable side member 8 is slid on the end surface of the cylindrical wall 7 on the inner end surface of the front housing 20, and the front end surface of the movable spiral wall 5 slides on the spiral bottom wall 3 of the fixed side member 4. By being moved, the position of the entire movable side member 8 in the axial direction is restricted to a predetermined position.

  Further, in this embodiment, as shown in FIG. 1, the fixed side member 4, particularly the integrated member 19 in this embodiment, is shaken from an oil storage chamber 37 that stores lubricating oil formed in the cylinder head 15. A lubricating oil guide path 38 is provided toward the installation portion of the movement allowance / rotation prevention section 29, and an orifice 39 capable of appropriately controlling the amount of the lubricating oil to be guided is provided in the guide path 38. It has been. Lubricating oil used in the installation portion of the swing allowing / rotating preventing portion 29 is further supplied to a portion requiring lubrication through the guide path 40. By providing such a lubricating oil guide structure, it is possible to maintain a stable operation of the rocking allowance / spinning prevention unit 29 at all times.

  The compression operation of the compressor 1 according to the present embodiment configured as described above will be described according to the progress of the phase angle of the main shaft 10 displayed as an angle in FIG. 5 with reference to FIG. In FIG. 5, ○ 1 indicates the volume in the rotary type volume change unit 13, ○ 2 and ○ 3 indicate a pair of fluid pockets formed in the scroll type volume change unit 11, and ○ 2 ′ indicates The fluid pocket ○ 2 shows a fluid pocket in a state in which the volume further advances and the volume is reduced.

  FIG. 5A shows that when the phase (turning position) of the center of the movable spiral wall 5 with respect to the center of the fixed spiral wall 2 is 0 °, (B) is 60 °, (C) is 120 °, and (D). Represents a phase of 180 °, (E) represents 240 °, and (F) represents a phase of 300 °. Along with the change in phase associated with the turning movement of the movable member 8, the rotary type volume changing unit 13 performs a one-stroke compression operation in one rotation, and the scroll type volume changing unit 11 has about 2.5 turns. The rotary type volume change unit 13 and the scroll type volume change unit 11 are communicated with each other in the majority of the compression operation via the communication path 33, and the compression operation is performed as a whole. It is performed at the same time. However, as a whole flow of the fluid to be compressed, the fluid compressed by the rotary type volume changing unit 13 mainly flows into the scroll type volume changing unit 11 and is further compressed, so that a high compression ratio can be achieved. ing.

  Further, the sliding / rotating operation of the swing allowance / spinning prevention portion 29 appropriately prevents the rotation of the movable side member 8 so that the swinging and turning operations can be performed smoothly. The scroll type compression operation in the volume change unit 11 is smoothly performed, and the rotary type compression operation in the rotary type volume change unit 13 is also smoothly performed, and the advantages of both volume change units are utilized.

  In addition, the communication path 33 and the wall steps 34 and 35 make it possible to smoothly control the communication between the rotary type volume changer 13 and the scroll type volume changer 11 and reduce the torque fluctuation while maintaining a high compression ratio. Operation is possible.

  Further, since the compression is performed by the cooperation of the rotary type volume changing unit 13 and the scroll type volume changing unit 11, the diameter of the scroll type volume changing unit 11 for achieving a desired capacity may be small, and the scroll type volume change The thrust load acting on the portion 11 is reduced, and for example, power consumption in a sliding portion with the front housing 20 is reduced. Further, since the scroll type volume changing unit 11 discharges the compressed fluid at a main shaft rotation angle of about 2.5 times that of the rotary type volume changing unit 13, the torque fluctuation as a whole of the compressor can be suppressed to be small, and the blow-by The reduction in compression performance is also kept small.

  Further, while the rotary type volume changing unit 13 and the scroll type volume changing unit 11 are combined, for example, a bearing 28 for rotating the movable member 8 and a balance weight 36 for canceling centrifugal force are provided on the cylindrical wall 7. Since the desired capacity can be achieved while keeping the axial dimension small, the compact, lightweight compressor 1 suitable for mounting on a vehicle or the like can be realized.

  Although the above embodiment has been described for a compressor, the present invention can be applied to an expander as well, and when applied to the expander, the suction and discharge paths of the target fluid are reversed from those of the compressor. .

  The fluid machine according to the present invention can be applied to both a compressor and an expander, and is particularly suitable as a compressor for use in a vehicle-mounted fluid machine, for example, a vehicle air conditioner.

It is a longitudinal section of the compressor concerning one embodiment of the present invention. It is a cross-sectional view of the compressor of FIG. It is a partial exploded perspective view of the compressor of FIG. It is the partial exploded perspective view seen from another direction of the compressor of Drawing 1. It is a see-through | perspective cross-sectional view of the compression mechanism part which shows the compression operation | movement of the compressor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Fixed spiral wall 3 Fixed spiral side baseplate 4 Fixed side member 5 Movable spiral wall 6 Movable spiral side bottom plate 7 Cylindrical wall 8 Movable side member 9 Crankshaft part 10 Main shaft 11 Scroll type volume change part 12 Fixed housing 13 Rotary type Volume changing portion 14 Discharge hole 15 as second communication hole Cylinder head 16 Discharge chamber 17 Discharge port 18 Suction chamber 19 Integrated member 20 Front housing 21 Through bolt 22 Pulley 23 Electromagnetic clutch 24 Large diameter portion 25 Bearing 26 Eccentric pin 27 Eccentricity Rotating roller 28 Bearing 29 Oscillating allowance / rotation preventing portion 30 Rotating body space 31 Columnar shoe 32 as rotating body Suction port 33 Communication path 34, 35 Wall step 36 Balance weight 37 Oil storage chamber 38 Guide path 39 Orifice 40 Guide path

Claims (17)

  A fixed-side member having a fixed spiral wall, a movable spiral wall that engages with the fixed spiral wall, a cylindrical wall at a different axial position from the movable spiral wall, and a pivot drive by a main shaft having a crankshaft portion A scroll-type volume changing portion between the spiral walls, an outer peripheral surface of a cylindrical wall of the movable side member, and an inner peripheral surface of a fixed housing that accommodates the movable side member. A fluid machine characterized in that a rotary type volume change portion is formed between the two, and the both volume change portions are configured to communicate with each other.   The movable side member extends radially outward from the cylindrical wall and engages with the fixed housing side to allow the movable side member to swing but prevent rotation. The fluid machine according to claim 1, comprising:   A rotating body space having an axis parallel to the main shaft is formed in the fixed housing, and the rotating body that slidably holds the swing allowance / spinning prevention portion is rotatable in the rotating body space. The fluid machine according to claim 2, which is fitted.   The rotating body is configured to slidably hold the swing allowance / spinning prevention portion between two opposing flat bottom surfaces in a pair of two columnar shoes having an arc surface and a flat bottom surface. The fluid machine according to claim 3.   The fluid machine according to claim 1, wherein a bearing for transmitting a driving force for turning the movable side member is provided inside the cylindrical wall of the movable side member.   The fluid machine according to any one of claims 1 to 5, wherein a balance weight capable of canceling a centrifugal force of the movable side member is provided inside the cylindrical wall of the movable side member.   The fluid machine according to any one of claims 1 to 6, wherein a position of the movable side member in a principal axis direction is regulated by sliding between an end surface of the cylindrical wall and a mating member of each end surface of the movable spiral wall. .   The fluid machine according to claim 7, wherein a crankshaft portion of the main shaft is supported by a front housing, and an end surface of the cylindrical wall of the movable member is slid on an end surface of the front housing.   The fluid machine according to claim 7, wherein an end surface of a movable spiral wall of the movable side member is slid with the fixed side member.   The fluid machine according to claim 1, wherein the fixed housing is formed integrally with the fixed side member.   A cylinder head that forms a discharge chamber is connected to the fixed side member, and a lubricating oil is supplied from an oil storage chamber that stores the lubricating oil formed in the cylinder head toward the rocking allowance / rotation prevention portion. The fluid machine according to claim 1, wherein a guide path is provided.   An outer peripheral surface of the fluid machine has at least one first through-hole communicating the two volume changing portions and the first external circuit, and the scroll type volume changing portion is provided at a central portion of the scroll type volume changing portion; The fluid machine according to any one of claims 1 to 11, further comprising a second communication hole that allows the portion to communicate with a second external circuit.   The wall step is provided in a partial position in the spiral direction of at least one of the spiral walls, and an inner space and an outer space are configured to be intermittently coupled or separated from the wall step. The fluid machine in any one of -12.   14. The communication path according to claim 1, wherein a communication path capable of intermittently coupling or separating an inner space and an outer space from the portion is formed at a partial position in the spiral direction of the fixed spiral wall. The fluid machine described in 1.   The fluid machine according to claim 1, comprising a compressor.   The fluid machine according to claim 1, comprising an expander.   The fluid machine according to claim 1, comprising a fluid machine for mounting on a vehicle.

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