JP2006183527A - Fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid machine capable of effectively suppressing coming-off of a rotation prevention pin of a turning scroll. <P>SOLUTION: This fluid machine includes a housing, a fixed scroll fixed on the housing, a turning scroll revolving in relation to the fixed scroll, and the rotation prevention mechanism 7 preventing rotation of the turning scroll. The rotation prevention mechanism 7 is embedded in a wall surface in a housing side or a wall surface in a turning scroll side and includes a fixing member 74 having material hardness higher than the wall surface and the rotation prevention pin 72 fitted in a fitting part formed in the fixed member 74. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fluid machine, and more particularly, to a fluid machine capable of effectively suppressing a pin that constitutes a rotation prevention mechanism of a turning scroll.

  As a conventional fluid machine, a technique described in Patent Document 1 is known. A conventional fluid machine has a fixed scroll and an orbiting scroll in which a spiral wrap is erected on one end face of an end plate. A scroll type fluid machine that revolves the orbiting scroll with respect to the fixed scroll.

  A conventional fluid machine has a turning-side fitting hole provided on the other end surface of the orbiting scroll end plate, one end fitted into the turning-side fitting hole, and the other end protruding from the turning-side fitting hole. A revolving-side projection (second pin) provided in the housing, a housing-side fitting hole provided in the housing, one end of which is fitted into the housing-side fitting hole, and the other end of the orbiting scroll end plate. The fixed-side protrusion (rotation prevention pin) provided to protrude from the other end surface side and the sliding contact portion on which the turning-side protrusion and the fixed-side protrusion slide allow maximum variation while allowing variation in the distance between the protrusions. A protrusion restraining member for regulating the distance. In such a configuration, the orbiting scroll rotation prevention mechanism is constituted by the orbiting side protrusion, the fixed side protrusion, and the protrusion restraining member.

  However, in a conventional fluid machine, when a repetitive load is applied to the turning-side protrusion and the fixed-side protrusion by the turning motion of the turning scroll, stress concentration occurs in the opening portions of the turning-side fitting hole and the housing-side fitting hole. The opening of the plastic deformation. Then, there is a problem that the turning-side protrusion and the fixed-side protrusion are loosely fixed, and these come out of the fitting hole (the turning-side fitting hole or the housing-side fitting hole).

JP 2001-90679 A

  Therefore, the present invention has been made in view of the above, and an object of the present invention is to provide a fluid machine that can effectively prevent the pins constituting the orbiting scroll rotation prevention mechanism from coming off.

  In order to achieve the above object, a fluid machine according to the present invention includes a housing, a fixed scroll fixed to the housing, a turning scroll revolving with respect to the fixed scroll, and rotation of the turning scroll. A rotation mechanism for preventing rotation, wherein the rotation prevention mechanism is embedded in the wall surface on the housing side or the wall surface on the orbiting scroll side and has a higher hardness than the wall surface; and The rotation prevention pin is configured to be fitted into a fitting portion formed on the fixing member.

  In this fluid machine, an anti-rotation mechanism is configured including a fixing member embedded in a wall surface and having a material hardness higher than that of the wall surface, and an anti-rotation pin fitted to a fitting portion formed on the fixing member. Therefore, there is an advantage that the rotation prevention pin constituting the rotation prevention mechanism of the orbiting scroll is effectively suppressed.

  In the fluid machine according to the present invention, the rotation prevention pin has a material hardness equal to or higher than that of the fixing member.

  In this fluid machine, since the anti-rotation pin has a material hardness equal to or higher than that of the fixing member, there is an advantage that the work of press-fitting the anti-rotation pin into the fixing member is facilitated.

  In the fluid machine according to the present invention, a surface hardening process is performed on a contact surface of the surface of the fixing member with the rotation prevention pin.

  In this fluid machine, since the surface hardening process is performed on the contact surface with the anti-rotation pin among the surfaces of the fixing member, plastic deformation of the fixing member is reduced. Thereby, there exists an advantage by which the omission of a rotation prevention pin is suppressed effectively.

  In the fluid machine according to the present invention, the chamfering process is performed on the opening of the fitting portion of the fixing member.

  In this fluid machine, since the chamfering process is performed on the opening of the fitting portion of the fixing member, stress concentration in the opening is reduced. Thereby, since the plastic deformation of the fixing member is reduced, there is an advantage that the anti-rotation pin is more effectively suppressed.

  In the fluid machine according to the present invention, in the installed state of the anti-rotation pin, the radial stress acting on the anti-rotation pin is closer to the fitting portion than the opening of the fitting portion of the fixing member. The outer diameter of the fixing member is configured to increase.

  In this fluid machine, since the outer diameter of the fixing member is configured so that the radial stress acting on the anti-rotation pin is larger on the rear side of the fitting portion than the opening of the fitting portion of the fixing member, The pin is more strongly held on the back side of the fitting portion of the fixing member. Thereby, there exists an advantage by which the fall | off of an autorotation prevention pin is suppressed more effectively.

  Moreover, in the fluid machine according to the present invention, the end portion of the rotation prevention pin has a shape in which the end portion on the side fitted to the fixing member is narrowed.

  In this fluid machine, since the end of the rotation prevention pin that is fitted to the fixing member has a narrowed shape, the fitting pressure between the pin and the fixing member increases. Thereby, there exists an advantage by which the omission of a rotation prevention pin is suppressed effectively.

  In the fluid machine according to the present invention, the anti-rotation pin has a locking portion, and the locking portion is inserted into a buried hole provided in the wall surface, and the fixing member is It is installed by being press-fitted into the buried hole of the wall surface while pressing the locking portion of the rotation prevention pin.

  In this fluid machine, the anti-rotation pin has a locking portion, and the locking portion is installed by being inserted into a buried hole provided on the wall surface, and the fixing member holds the buried portion while pressing the locking portion. Therefore, the anti-rotation pin is pressed down by the fixing member in the embedded hole and firmly fixed. Thereby, there exists an advantage by which the omission of a rotation prevention pin is suppressed effectively.

  According to the fluid machine of the present invention, the rotation prevention includes the fixing member embedded in the wall surface and having a higher material hardness than the wall surface, and the anti-rotation pin fitted to the fitting portion formed on the fixing member. Since the mechanism is configured, there is an advantage that the anti-rotation pin constituting the rotation prevention mechanism of the orbiting scroll is effectively suppressed.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. The constituent elements of this embodiment include those that can be easily replaced by those skilled in the art or those that are substantially the same. In addition, a plurality of modifications described in this embodiment can be arbitrarily combined within a range obvious to those skilled in the art.

  FIG. 1 is a view showing a fluid machine according to an embodiment of the present invention. 2-4 is explanatory drawing which shows the rotation prevention mechanism of the fluid machine described in FIG. 5-14 is explanatory drawing which shows the modification of the rotation prevention mechanism described in FIG.

[Fluid machine]
The fluid machine 1 is, for example, a scroll compressor of an air conditioner, and has a function of compressing gas (refrigerant) and supplying it to a refrigerant circuit of the air conditioner. The fluid machine 1 includes a housing 2, a fixed scroll 3, a turning scroll 4, a drive mechanism 5, and an intermediate mechanism 6.

  The housing 2 includes a housing main body 21 and a front case 22. The housing body 21 is made of a container-shaped member, and has a suction chamber 23 and a discharge chamber 24 therein. Further, the housing body 21 has a suction port 25 and a discharge port 26 on its side. The front case 22 is a case that houses the drive mechanism 5, and is attached to the opening of the housing body 21 to seal the inside of the housing body 21. The front case 22 is bolted (not shown) to the housing body 21. In the fluid machine 1, external gas is taken into the suction chamber 23 in the housing 2 from the suction port 25, and gas in the discharge chamber 24 is discharged to the outside from the discharge port 26.

  The fixed scroll 3 includes an end plate 31 and a spiral wrap 32 formed on the end plate 31. The fixed scroll is accommodated in the housing 2 with the wrap 32 facing the suction chamber 23, and is fixed to the inner wall surface of the housing 2 by the end plate 31. The fixed scroll 3 (end plate 31) also serves as a partition member that partitions the suction chamber 23 and the discharge chamber 24 in the housing 2.

  The orbiting scroll 4 includes an end plate 41 and a spiral wrap 42 formed on the end plate 41. The orbiting scroll 4 is installed in the housing 2 so that the wrap 42 is engaged with the wrap 32 of the fixed scroll 3 while being eccentric. With such an arrangement, a plurality of sealed spaces S are formed between the wraps 32 and 42 of the fixed scroll 3 and the orbiting scroll 4. Further, the orbiting scroll 4 is arranged so as to be able to perform a revolving orbiting motion while preventing rotation with respect to the fixed scroll 3. The orbiting scroll 4 and the fixed scroll 3 are configured so that the volume of the sealed space S is gradually reduced by the revolution orbiting motion of the orbiting scroll 4.

  The drive mechanism 5 includes a rotary shaft 51 and a main bearing 52. The rotary shaft 51 is a drive shaft for driving the orbiting scroll 4. The rotating shaft 51 is connected to an external power source at one end, and is connected to the intermediate mechanism 6 at the other end. The main bearing 52 is a bearing that supports the rotating shaft 51 and is disposed in the front case 22.

  The intermediate mechanism 6 is a mechanism for connecting the rotating shaft 51 of the drive mechanism 5 and the orbiting scroll 4 and is configured by, for example, an Oldham mechanism. The intermediate mechanism 6 has a function of converting the rotational motion of the rotary shaft 51 into a revolving orbiting motion and transmitting it to the orbiting scroll 4.

  In the fluid machine 1, when the rotating shaft 51 rotates, the power is transmitted to the orbiting scroll 4 through the intermediate mechanism 6, and the orbiting scroll 4 performs a revolving orbiting motion while being eccentric with respect to the fixed scroll 3. Then, the gas in the suction chamber 23 is taken from the periphery into the sealed space S between the orbiting scroll 4 and the fixed scroll 3, and the sealed space S is narrowed to compress the gas in the sealed space S. Then, the compressed gas is discharged from a hole 33 formed substantially at the center of the fixed scroll 3, flows into the discharge chamber 24, is discharged from the discharge port 26, and is supplied to the outside.

[Rotation prevention mechanism]
Further, the fluid machine 1 has a rotation prevention mechanism 7 (see FIG. 1). The rotation prevention mechanism 7 has a function of preventing rotation of the orbiting scroll 4 and is disposed so as to be interposed between the housing 2 and the orbiting scroll 4. In the fluid machine 1, a plurality of rotation prevention mechanisms 7 are arranged in an annular shape along the circumference of the orbiting scroll 4. The rotation prevention mechanism 7 includes a rotation prevention rotation prevention pin 72 and a guide 73 (see FIGS. 2 and 3). The rotation prevention pin 72 is installed so as to protrude from the end plate 41 of the orbiting scroll 4. The guide 73 has a container shape (or thin cylindrical shape) and is press-fitted into a hole formed in the wall surface on the front case 22 side. Then, the tip of the rotation prevention pin 72 is inserted into the guide 73.

  In this rotation prevention mechanism 7, when the orbiting scroll 4 is displaced during operation of the fluid machine 1, the rotation prevention pin 72 is displaced along with this and slides on the inner periphery of the guide 73. Thereby, the orbiting scroll 4 is restrained by the rotation prevention pin 72, and the rotation of the orbiting scroll 4 is prevented.

[Pin fixing structure]
In this rotation prevention mechanism 7, the rotation prevention pin 72 is fixed to the wall surface on the side of the orbiting scroll 4 (the back surface of the end plate 41) via a fixing member 75 (see FIGS. 2 and 4). In this anti-rotation mechanism 7, contrary to the above structure, the anti-rotation pin 71 may be fixed to the wall surface on the front case 22 side, and a hole for the guide 73 may be provided on the wall surface on the orbiting scroll 4 side. (Not shown). Further, rotation prevention pins 71 are respectively fixed to both the wall surface on the orbiting scroll 4 side and the wall surface on the front case 22 side, and these rotation prevention pins 71 and 71 are restrained from rotating by being restrained in relative distance by a restraining member. The mechanism 7 may be configured (not shown). In any case, the same configuration can be adopted as the fixing structure of the rotation prevention pin 72.

  In this rotation prevention mechanism 7, the rotation prevention pin 72 has a substantially cylindrical shape. Further, the fixing member 74 has a fitting portion 741 that fits with the rotation prevention pin 72. Specifically, the fixing member 74 has a cylindrical shape, and the fitting portion 741 is configured by the hollow portion. A buried hole 76 is formed in the wall surface of the orbiting scroll 4, and a fixing member 74 is press-fitted into the buried hole 76 and buried. At this time, the fixing member 74 is installed such that the opening 742 of the fitting portion 741 appears on the wall surface of the housing 2. Then, the anti-rotation pin 72 is press-fitted into the fitting portion 741 of the fixing member 74 and fixed.

  In this rotation prevention mechanism 7, the fixing member 74 has a cylindrical shape. However, the present invention is not limited to this, and the fixing member 74 may have a rectangular tube shape or may be configured by an annular member (not shown). ). Moreover, although the fitting part 741 of the fixing member 74 is comprised by the cylindrical-shaped hollow part, it is not restricted to this, The fitting part 741 may be comprised by a fitting hole or a fitting hole (illustration omitted).

  Further, in this rotation prevention mechanism 7, the fixing member 74 has a material hardness (or yield point) higher than the wall surface (end plate 41) on the orbiting scroll 4 side. Specifically, the fixing member 74 is made of high carbon chromium bearing steel, and the wall surface on the orbiting scroll 4 side is made of an aluminum material.

[effect]
Here, in the configuration in which the rotation prevention pin is directly embedded in the wall surface (see Patent Document 1), the opening of the wall surface supporting the rotation prevention pin (the opening of the embedded hole) is plastically deformed to rotate. The prevention pin is easily removed from the wall surface. In this regard, in the rotation prevention mechanism 7 according to the fluid machine 1, a fixing member 74 is embedded in the wall surface on the side of the orbiting scroll 4. The fixing member 74 has a fitting portion 741, and the fitting portion 741. On the other hand, the rotation prevention pin 72 is press-fitted and fixed. The fixing member 74 has a material hardness higher than that of the wall surface on the orbiting scroll 4 side. In such a configuration, since plastic deformation of the member (fixing member 74) that supports the rotation prevention pin 72 is reduced, the engagement between the rotation prevention pin 72 and the fixing member 74 is difficult to loosen. As a result, there is an advantage that the rotation prevention pin 72 is effectively prevented from coming off when the orbiting scroll 4 is driven.

  In addition, since the Oldham link is unnecessary in the fluid machine 1, the Oldham link groove provided in the end plate of the orbiting scroll is eliminated, and the end plate of the orbiting scroll can be thinned. This has the advantage that the cost of the product can be reduced.

  Moreover, in this fluid machine 1, since the outer diameter of the housing 2 may remain the same (since it is equivalent to the housing of the conventional fluid machine), the design change of other components (for example, a crankshaft and a balance weight) is minimized. There is an advantage that can be limited. Such an advantage is particularly beneficial in a field where a reduction in size and weight is required, such as a vehicle scroll compressor.

  Further, in this fluid machine 1, the anti-rotation pin 72 and the fixing member 74 are made of separate members, and therefore, compared with a configuration in which these are integrally formed by a single member (see FIG. 14), the following This is preferable. First, since the anti-rotation pin 72 requires higher material hardness than the fixed member 74 and the end plate 41 of the orbiting scroll 4, its workability is required. Therefore, since the rotation prevention pin 72 and the fixing member 74 are made of different members, there is an advantage that the rotation prevention pin 72 can be easily processed. Further, as compared with a configuration in which both the anti-rotation pin 72 and the fixing member 74 are made of a material having a high material hardness, only the anti-rotation pin 72 can be made of a material having a high material hardness, and thus there is an advantage that the material cost can be reduced. .

[Modification 1]
In the fluid machine 1, it is preferable that the rotation prevention pin 72 of the rotation prevention mechanism 7 has a material hardness equal to or higher than that of the fixing member 74. Thereby, there exists an advantage that the operation | work which press-fits the autorotation prevention pin 72 to the fixing member 74 becomes easy. As such a configuration, for example, (1) the rotation prevention pin 72 is made of a material having a higher yield point than the fixing member 74, and (2) the rotation prevention pin 72 is subjected to heat treatment or other surface hardening treatment. Configuration is included.

[Modification 2]
Moreover, in this fluid machine 1, it is preferable that a surface hardening process is given to the contact surface with the rotation prevention pin 72 among the surfaces of the fixing member 74 (refer FIG. 5). For example, the surface hardening process is performed on the inner peripheral surface of the fixing member 74 having a substantially cylindrical shape. In such a configuration, the material hardness of the inner peripheral surface (in particular, the opening 742) of the fixing member 74 is increased as compared with a configuration in which the surface hardening treatment is not performed on the fixing member. Thereby, since the plastic deformation of the fixing member 74 is reduced, there is an advantage that the rotation prevention pin 72 is effectively prevented from coming off. Note that the surface hardening treatment includes, for example, heat treatment and coating treatment.

[Modification 3]
In the fluid machine 1, it is preferable that the chamfering process is performed on the opening 742 of the fixing member 74 (see FIG. 6). In such a configuration, stress concentration in the opening 742 is alleviated as compared with a configuration in which C opening chamfering is performed on the opening or a configuration in which no processing is performed. Thereby, since the plastic deformation of the fixing member 74 is reduced, there is an advantage that the rotation prevention pin 72 is effectively prevented from coming off. Further, when a load is applied to the rotation prevention pin 72 during operation, the opening 742 of the fixing member 74 smoothly abuts against the rotation prevention pin 72, so that the fatigue failure of the rotation prevention pin 72 is suppressed. There is.

[Modification 4]
Further, in the fluid machine 1, in a state where the rotation prevention pin 72 is press-fitted into the fitting portion 741 of the fixing member 74, radial stress acting on the rotation prevention pin 72 at the press-fitting portion causes the opening of the fixing member 74. It is preferable that the outer diameter of the fixing member 74 is configured to be larger than the portion 742 on the back side of the fitting portion (see FIG. 7). For example, the outer diameter of the fixing member 74 has a bulging portion, and the outer diameter of the middle abdomen embedded in the wall surface is configured to be larger than the outer diameter of the opening 742. As an example, a configuration in which the fixing member 74 has a cylindrical shape in which the outer diameter of the middle abdomen is expanded (becomes symmetric in a cross-sectional view) (see FIG. 7A).

  In such a configuration, since the amount of elastic deformation or plastic deformation when the fixing member 74 is press-fitted into the embedded hole 76 is different, the radial stress acting on the anti-rotation pin 72 in the press-fitted state of the anti-rotation pin 72 is increased. The fixing member 74 is larger on the back side of the fitting portion than in the vicinity of the opening 742 of the fixing member 74. For this reason, the anti-rotation pin 72 is more strongly held on the back side of the fitting portion of the fixing member 74 (see FIG. 7B). Therefore, even if the opening 742 of the fixing member 74 is plastically deformed by a load from the rotation prevention pin 72, the engagement between the rotation prevention pin 72 and the fixing member 74 is difficult to loosen. Thereby, there exists an advantage by which the fall of the rotation prevention pin 72 is suppressed more effectively. Further, as a configuration in which the radial stress acting on the other anti-rotation pins 72 is larger on the back side than the opening 742 of the fitting portion of the fixing member 74, the configuration is not the outer diameter shape of the fixing member 74. A similar stress distribution can be formed even if the diameter of the inner surface shape of the embedded hole 76 is made small in the middle between the opening and the back (see FIG. 7C).

[Modification 5]
Further, in the fluid machine 1, it is preferable that the end of the rotation preventing pin 72 that is pressed into the fixing member 74 has a shape that is narrowed in the press-fitting direction (see FIGS. 8 and 9). . In such a configuration, the fitting pressure between the rotation prevention pin 72 and the fixing member 74 is increased as compared with a configuration in which the rotation prevention pin 72 has a cylindrical shape. Thereby, there exists an advantage by which the anti-rotation pin 72 omission is suppressed effectively. Note that in this configuration, the press-fitting side end of the anti-rotation pin 72 has a taper shape or a wedge shape (see FIG. 8), or the diameter d1 of the middle part of the anti-rotation pin 72 is the diameter d2 of the press-fitting side end. Larger configuration (see FIG. 9).

[Modification 6]
Further, in this fluid machine 1, the rotation prevention pin 72 has the locking portion 711, and the embedded hole 76 is formed in the wall surface on the orbiting scroll 4 side, and the rotation prevention pin 72 is locked in the embedded hole 76. A configuration is preferable in which 711 is inserted (press-fitted) and the fixing member 74 is press-fitted into the embedded hole 76 while pressing the locking portion 711 of the anti-rotation pin 72 in the depth direction of the embedded hole 76. (See FIG. 10). In this configuration, the anti-rotation pin 72 is pressed in the axial direction by the fixing member 74 in the buried hole 76 on the wall surface, and is firmly fixed. Thereby, there exists an advantage by which the anti-rotation pin 72 omission is suppressed effectively. The locking portion 711 of the anti-rotation pin 72 may be, for example, a stepped portion or a protrusion formed on the cylindrical anti-rotation pin 72, or may be formed at the tip of the anti-rotation pin 72 on the press-fitting side. It may be a locking piece (not shown).

[Modification 7]
Moreover, in this fluid machine 1, the fixing member 74 may be abbreviate | omitted in said modification 1-6 (refer FIGS. 11-14). That is, the rotation prevention pin 72 may be directly embedded in the embedded hole 76 on the wall surface without the fixing member 74 being interposed.

  Specifically, the rotation prevention pin 72 may be press-fitted into the buried hole 76 on the wall surface and directly buried, and the opening portion of the buried hole 76 may be subjected to R chamfering (see FIG. 11). ). In such a configuration, stress concentration at the opening of the embedded hole 76 is reduced as compared with a configuration in which the chamfering process is performed on the opening of the embedded hole 76 or a structure in which no processing is performed. Thereby, since the plastic deformation of the opening part of the embedding hole 76 is reduced, there is an advantage that the anti-rotation pin 72 is effectively prevented from coming off. Further, when a load is applied to the anti-rotation pin 72 during operation, elastic deformation of the anti-rotation pin 72 is allowed in the vicinity of the opening of the embedded hole 76, so that fatigue failure of the anti-rotation pin 72 is suppressed. There are advantages.

  Further, the anti-rotation pin 72 is directly press-fitted into the embedding hole 76 on the wall surface, and the end of the anti-rotation pin 72 on the side to be press-fitted into the embedding hole 76 is narrowed in the press-fitting direction. It is good also as a structure which has the shape formed (refer FIG. 12 and FIG. 13). In such a configuration, the engagement pressure between the rotation prevention pin 72 and the embedded hole 76 increases as compared with a configuration in which the rotation prevention pin 72 has a uniform diameter in the longitudinal direction. Thereby, there exists an advantage by which the anti-rotation pin 72 omission is suppressed effectively. In this configuration, the press-fitting portion of the anti-rotation pin 72 has a taper shape or a wedge shape (see FIG. 12), or a configuration in which the diameter d1 of the middle abdomen is larger than the diameter d2 of the tip portion on the press-fit side (FIG. Reference).

  Further, a configuration may be adopted in which the rotation prevention pin 72 is press-fitted into the embedding hole 76 on the wall surface and directly embedded, and the press-fitted portion of the rotation prevention pin 72 is formed with a large diameter (FIG. 14). In such a configuration, the anti-rotation pin 72 is press-fitted into the embedded hole 76 and fixed at the large diameter portion. Therefore, compared with a configuration in which the pin diameter remains thin (see Patent Document 1), the opening of the embedded hole 76 is less likely to be plastically deformed. Thereby, there exists an advantage by which the anti-rotation pin 72 omission is suppressed effectively.

[Application example]
In the first embodiment, the scroll compressor of the air conditioner has been described as an example of the fluid machine 1. In such a scroll compressor, an excessive load is repeatedly applied to the anti-rotation pin 72 when the gas is compressed, and therefore the anti-rotation pin 72 is likely to come off. In this respect, the fluid machine 1 can be effectively suppressed when the anti-rotation pin 72 is pulled out, and thus is particularly useful when applied to such a scroll compressor. Moreover, the fixing structure of the rotation prevention pin 72 in the fluid machine 1 may be applied to a press-fit pin of a general machine such as an axle.

  As described above, the fluid machine according to the present invention is useful in that it can effectively prevent the turning prevention pin of the orbiting scroll from coming off.

It is a figure which shows the fluid machine concerning the Example of this invention. It is explanatory drawing which shows the rotation prevention mechanism of the fluid machine described in FIG. It is explanatory drawing which shows the rotation prevention mechanism of the fluid machine described in FIG. It is explanatory drawing which shows the rotation prevention mechanism of the fluid machine described in FIG. It is explanatory drawing which shows the modification of the rotation prevention mechanism described in FIG. It is explanatory drawing which shows the modification of the rotation prevention mechanism described in FIG. It is explanatory drawing which shows the modification of the rotation prevention mechanism described in FIG. It is explanatory drawing which shows the modification of the rotation prevention mechanism described in FIG. It is explanatory drawing which shows the modification of the rotation prevention mechanism described in FIG. It is explanatory drawing which shows the modification of the rotation prevention mechanism described in FIG. It is explanatory drawing which shows the modification of the rotation prevention mechanism described in FIG. It is explanatory drawing which shows the modification of the rotation prevention mechanism described in FIG. It is explanatory drawing which shows the modification of the rotation prevention mechanism described in FIG. It is explanatory drawing which shows the modification of the rotation prevention mechanism described in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluid machine 2 Housing 21 Housing main body 22 Front case 23 Suction chamber 24 Discharge chamber 25 Suction port 26 Suction port 3 Fixed scroll 31 End plate 32 Lap 33 Hole 4 Orbiting scroll 41 End plate 42 Lap 5 Drive mechanism 51 Rotating shaft 52 Main bearing 6 Intermediate mechanism 7 Anti-rotation mechanism 72 Anti-rotation pin 711 Locking portion 73 Restraining member 74 Fixing member 741 Fitting portion 742 Opening portion S Sealed space

Claims (7)

A fluid machine including a housing, a fixed scroll fixed to the housing, a turning scroll that revolves around the fixed scroll, and a rotation prevention mechanism that prevents rotation of the turning scroll;
The rotation prevention mechanism is fitted in a fixing member embedded in the wall surface on the housing side or the wall surface on the orbiting scroll side and having a higher material hardness than the wall surface, and a fitting portion formed in the fixing member. And a rotation prevention pin.   The fluid machine according to claim 1, wherein the rotation prevention pin has a material hardness equal to or higher than that of the fixing member.   The fluid machine according to claim 1, wherein a surface hardening process is performed on a contact surface of the surface of the fixing member with the rotation prevention pin.   The fluid machine according to claim 1, wherein an R chamfering process is performed on the opening of the fitting portion of the fixing member.   In the installed state of the anti-rotation pin, the radial stress acting on the anti-rotation pin becomes larger on the outer side of the fitting portion than the opening of the fitting portion of the fixing member. The fluid machine according to any one of claims 1 to 4, wherein a diameter is configured.   The fluid machine according to any one of claims 1 to 5, which has a shape in which an end portion of the end portion of the rotation prevention pin that is fitted to the fixing member is narrowed.   The anti-rotation pin has an engaging portion, and is installed by inserting the engaging portion into a buried hole provided in the wall surface, while the fixing member holds down the engaging portion of the anti-rotation pin. The fluid machine according to any one of claims 1 to 6, wherein the fluid machine is installed by being press-fitted into a buried hole of the wall surface.

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