JP2016023612A - Scroll type fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To finely keep dimensional accuracy by fixing a shell-integrated fixed scroll in an axial direction.SOLUTION: A shell-integrated scroll 28 of a scroll type compressor 10 is equipped with a cylindrical center housing 22 (a shell) which is integrally molded with an end plate 12a on which a scroll lap 12b is raised, and connected with the whole circumference of an outer periphery of the end plate 12a at a base end portion and extended in an axial direction at a tip end portion. A wall of a part of the shell makes a thick-wall portion 84 formed in a thick-wall state from a base end side end surface 22a to a tip end side end surface 22b. At the thick-wall portion, a screwing hole 22c of a bolt 30 fastening a rear housing 24 to the end surface 22a extends from the end surface 22a toward the end surface 22b, and a screwing hole 22d of a bolt 40 fastening a front housing 26 to the end surface 22b extends from the end surface 22b toward the end surface 22a. An opposite surface 86 opposing in the axial direction is formed by notching a part of the thick-wall portion 84 in a circumferential direction of the shell between the end surfaces 22a and 22b, and a locking portion is locked to the opposite surface to add a load in the axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a scroll type fluid machine including a turning scroll and a fixed scroll, and more particularly to a fixed structure when processing a shell integrated fixed scroll in which a shell is integrated with a fixed scroll.

  As a scroll type fluid machine, a scroll type compressor as disclosed in Patent Document 1 is known. Such a scroll compressor includes a fixed scroll and an orbiting scroll that are opposed to each other in the axial direction by meshing a spiral scroll wrap standing upright from an end plate, and the orbiting scroll revolves around the center axis of the fixed scroll. The fluid introduced into the gap between the fixed scroll and the orbiting scroll is compressed and discharged. Of these, the fixed scroll has a cylindrical shell extending from the outer periphery of the end plate in the central axis direction. The shell is integrally molded to form a shell-integrated fixed scroll. Such a shell-integrated fixed scroll is formed by, for example, casting or forging, and then is subjected to intermediate or finishing processing such as cutting and grinding (hereinafter referred to as “finishing processing” or the like) in order to improve dimensional accuracy. ).

JP 2002-13486 A

  However, when the cylindrical shell is sandwiched from the side to fix the shell-integrated fixed scroll in finishing or the like, there is no support structure that supports the shell and the scroll wrap, so the shell is deformed. May end up. For this reason, it becomes difficult to maintain the dimensional accuracy of the shell integrated fixed scroll well, and the productivity of the scroll type fluid machine may be reduced.

  Further, the end face of the shell, the end face of the scroll wrap, and the like are subject to finishing processing or the like because of the demand for dimensional accuracy, so it is preferable to sandwich and fix the shell integrated fixed scroll in the axial direction using these end faces and the like. Absent.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a scroll-type fluid machine that improves the productivity by improving the fixing structure of the shell-integrated fixed scroll when finishing or the like. To do.

  For this reason, the scroll type fluid machine according to the present invention includes an orbiting scroll and a fixed scroll, and the fixed scroll is integrally formed with the spiral scroll wrap erected from the end plate and the end plate. A cylindrical shell having an end connected to the outer periphery of the end plate and a tip extending in the direction in which the scroll wrap is erected, and a part of the wall of the shell from the proximal end surface of the shell A thick hole is formed up to the distal end surface, and a screw hole of a first bolt for fastening the first housing to the proximal end surface is formed in the thick wall of the shell. A thick-walled portion extending from the distal end surface toward the proximal end surface, and a screw hole of a second bolt for fastening the second housing to the distal end end surface. Comprising the proximal end side A portion of said thick portion between the surface and the distal end surface by cutting in a circumferential direction of the shell and forms a surface facing in the axial direction.

  According to the scroll type fluid machine of the present invention, the shell-integrated fixed scroll can be fixed by applying a load in the axial direction, and the fixing structure of the shell-integrated fixed scroll when finishing or the like is improved. Good dimensional accuracy of the fixed scroll can be easily maintained, and productivity can be improved.

It is sectional drawing which shows the whole structure of a scroll compressor. It is a perspective view of the opening side of a shell integrated fixed scroll. It is a perspective view by the side of the baseplate of a shell integrated fixed scroll. It is a fragmentary sectional view which shows another example of the notch in a thick part. It is explanatory drawing which shows the fixing method of a shell integrated fixed scroll. It is a fragmentary sectional view showing another example of a screw hole.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. Note that the scroll type fluid machine according to the present invention can be used as a compressor or an expander. Here, an example of the compressor will be described.

1-3 has shown an example of the scroll compressor which is embodiment of this invention.
The scroll compressor 10 includes a fixed scroll 12 and a turning scroll 14 that are opposed to each other in the central axis direction. The fixed scroll 12 has a spiral scroll wrap 12b integrally formed with the end plate 12a and standing from the end plate 12a. Similarly, the orbiting scroll 14 has a spiral scroll wrap 14b integrally formed with the end plate 14a and standing from the end plate 14a.

  The fixed scroll 12 and the orbiting scroll 14 mesh both scroll wraps 12b and 14b in the axial direction, the protruding edge of the scroll wrap 12b contacts the end plate 14a, and the protruding edge of the scroll wrap 14b is the end. It arrange | positions so that the board 12a may be contacted. A tip seal (not shown) is embedded in the protruding edge of both scroll wraps 12b, 14b.

  The fixed scroll 12 and the orbiting scroll 14 are arranged so that the side walls of the scroll wraps 12b and 14b are partially in contact with each other with the circumferential angles of the scroll wraps 12b and 14b shifted from each other. . As a result, a fluid pocket 16 is formed between the scroll wraps 12b and 14b as a crescent-shaped sealed space as viewed in the axial direction.

  The orbiting scroll 14 is revolved around the central axis of the fixed scroll 12 by a drive mechanism 18 and a rotation prevention mechanism 20 which will be described later, and rotation is prevented. As a result, the fluid pocket 16 formed between the scroll wraps 12b and 14b is moved from the outer end portion to the center portion of the scroll wraps 12b and 14b, so that the volume of the fluid pocket 16 changes in the shrinking direction. To do. Therefore, the fluid (for example, refrigerant gas) taken into the fluid pocket 16 from the outer end side of both the scroll wraps 12b and 14b is compressed.

  In the case of an expander, the volume of the fluid pocket 16 changes in the increasing direction by moving the fluid pocket 16 from the center of the scroll wraps 12b, 14b toward the outer end. The fluid taken into the fluid pocket 16 from the center side of the scroll wraps 12b, 14b is expanded.

  The housing of the scroll compressor 10 includes a center housing 22 that integrally includes the fixed scroll 12, and a rear housing (first housing) that is disposed on the back surface side of the end plate 12a from which the scroll wrap 12b does not protrude. (Housing) 24 and a front housing (second housing) 26 disposed on the surface side of the end plate 12a from which the scroll wrap 12b protrudes in the fixed scroll 12.

  The center housing 22 is a cylindrical housing portion (shell) whose base end portion is coupled to the entire periphery of the end plate 12a of the fixed scroll 12 and whose front end portion extends in the standing direction of the scroll wrap 12b. The shell 12 is integrally formed with the scroll 12 to form a shell integrated fixed scroll 28. In other words, in the shell-integrated fixed scroll 28, the rear housing 24 side of the opening of the cylindrical center housing 22 is closed by the end plate 12 a of the fixed scroll 12, and the front housing 26 side of the center housing 22 is opened. It has a bottomed cylindrical shape with 12a as the bottom plate.

  The rear housing 24 is fastened to the base end side end surface 22a of the center housing 22 by a plurality of bolts 30 (first bolts), and the fluid discharge chamber 32 is formed between the rear housing 24 and the end plate 12a. A discharge hole 34 for introducing the fluid in the fluid pocket 16 compressed by the revolving motion of the orbiting scroll 14 into the discharge chamber 32 is opened at the center of the end plate 12a. A one-way valve 36 is provided to prevent this. Further, a discharge port (not shown) of the fluid from the discharge chamber 32 to the outside is provided on the outer wall of the rear housing 24.

  The front housing 26 is fastened to the front end side end surface 22b of the center housing 22 by a plurality of bolts 40 (second bolts). The front housing 26 is formed therein with a housing space portion 42 that houses the drive mechanism 18 of the orbiting scroll 14, and a bearing 46 that supports the drive shaft 44 of the drive mechanism 18 at one end side of the housing space portion 42. A shaft seal portion 48 is provided. A thrust receiving portion 52 that supports the orbiting scroll 14 in the thrust direction via an annular thrust plate 50 is formed on the other end side of the accommodation space portion 42. Further, the front housing 26 is formed with a fluid suction chamber 54 that is separated by the accommodation space 42, the orbiting scroll 14, and the thrust plate 50, via a suction port (not shown) provided on the outer wall of the front housing 26. Then, the fluid is sucked into the fluid suction chamber 54 from the outside.

  In the front housing 26 and the center housing 22, a bulging portion 58 is formed in a part in the circumferential direction. Inside the bulging portion 58, extending in a direction parallel to the compressor central axis, from the suction chamber 54 on the front housing 26 side to the vicinity of the outer ends of the scroll wraps 12 b and 14 b on the center housing 22 side, A fluid passage space 60 for guiding the fluid is formed.

  The fluid is introduced into a suction chamber 54 in the front housing 26 from a suction port provided in the front housing 26, and passes through a fluid passage space 60 inside the bulging portion 58 of the front housing 26 and the center housing 22, It is taken into the aforementioned fluid pocket 16 from the outer end side of both scroll wraps 12b, 14b and used for compression. The compressed fluid is discharged from a discharge hole 34 formed in the center of the end plate 12a of the fixed scroll 12 to a discharge chamber 32 in the rear housing 24, and is led out to the outside through a discharge port. .

  The drive mechanism 18 accommodated in the accommodating space 42 of the front housing 26 is a drive shaft that is rotationally driven by a rotational drive force input from the outside, as described in, for example, Japanese Patent Application Laid-Open No. 2012-237288. A crank mechanism is provided at 44, and is connected to the orbiting scroll 14 via this crank mechanism.

  In the drive mechanism 18, the drive shaft 44 is rotatably supported by a bearing 46 on one end side of the accommodation space 42. One end side of the drive shaft 44 protrudes outside the front housing 26, and a pulley 64 is attached to the drive shaft 44 via an electromagnetic clutch 62. Accordingly, the drive shaft 44 is rotationally driven by the rotational driving force input from the pulley 64 via the electromagnetic clutch 62. The crank mechanism provided on the other end side of the drive shaft 44 includes a crank 68 that is pivotally supported on the inner peripheral wall of the accommodating space 42 via a bearing 66, and the crank 68 is eccentric with respect to the central axis of the drive shaft 44. The eccentric bush 70 is fitted to the inside of a cylindrical boss portion 72 protruding from the back surface of the end plate 14a of the orbiting scroll 14 via a bearing 74. ing. In FIG. 1, the drive shaft 44 to the eccentric bush 70 are integrally illustrated as the drive mechanism 18 for simplification of the drawing.

  The rotation preventing mechanism 20 of the orbiting scroll 14 includes a circular hole 76 formed in the back surface of the end plate 14 a of the orbiting scroll 14 (opposite the thrust receiving portion 52 of the front housing 26), and a thrust receiving portion of the front housing 26. 17 includes a pin 78 protruding through the thrust plate 50 and penetrating the thrust plate 50, and a disc 82 having an eccentric hole 80 and accommodated in a circular hole 76 with a gap provided between the pin 78 and the eccentric hole of the disc 82. 80 is configured to be fitted with a gap, and the rotation of the orbiting scroll 14 is prevented by the engagement of the pin 78 and the eccentric hole 80.

  Accordingly, the orbiting scroll 14 orbits through the crank mechanism by the rotation of the drive shaft 44, and the orbiting scroll 14 is prevented from rotating by the rotation prevention mechanism 20, and the orbiting scroll 14 revolves around the central axis of the fixed scroll 12. Exercise.

Here, in addition to FIG. 1, the structure of the shell integrated fixed scroll 28 will be described in detail with reference to FIGS. 2 and 3 show the shell integrated fixed scroll 28.
The shell-integrated fixed scroll 28 has a thick portion 84 in which a part of the wall of the center housing 22 is formed thick from the proximal end surface 22 a to the distal end surface 22 b of the center housing 22. In the wall of the thick wall portion 84, a screw hole 22c of a bolt 30 for fastening the rear housing 24 to the proximal end surface 22a of the center housing 22 extends from the proximal end surface 22a toward the distal end surface 22b. The screw hole 22d of the bolt 40 that fastens the front housing 26 to the front end side end surface 22b of the center housing 22 extends from the front end side end surface 22b toward the base end side end surface 22a. That is, in the thick portion 84, the screwing hole 22c of the bolt 30 and the screwing hole 22d of the bolt 40 are paired in the axial direction at a position where the angles around the central axis are the same.

  For example, the thickness t of the wall of the center housing 22 other than the thick portion 84 can be reduced by changing the molding method of the shell integrated fixed scroll 28 from casting to forging to maintain the strength and reduce the weight of the shell integrated fixed scroll 28. For this reason, the thickness is reduced to a thickness capable of maintaining a constant strength. For this reason, the thickness is such that there is almost no room for forming both screw holes 22c and 22d of the bolt 40 and the bolt 30. Therefore, the thick portion 84 is provided in the center housing 22 in order to form the screw hole 22d of the bolt 40 and the screw hole 22c of the bolt 30.

  A part of the thick wall portion 84 between the proximal end surface 22a and the distal end surface 22b of the center housing 22 is notched in the circumferential direction of the center housing 22 by lathe processing or the like. The part 84 is divided into two parts, a first thick part 84a in which the screwing hole 22c of the bolt 30 is formed and a second thick part 84b in which the screwing hole 22d of the bolt 40 is formed. A facing surface 86 is formed between the portion 84a and the second thick portion 84b so as to face in the substantially axial direction. In the following description, in the facing surface 86, the first thick portion 84a side is referred to as a first facing surface 86a, and the second thick portion 84b side is referred to as a second facing surface 86b.

  In FIG. 1, the screwing hole 22 d of the bolt 40 appears on the facing surface 86 formed by the notch, and the screwing hole 22 c of the bolt 30 does not appear. However, as shown in FIG. You may comprise so that the holes 22c and 22d may also appear. Further, the opposing surface 86 formed by the notch is configured such that the screwing hole 22c of the bolt 30 appears and the screwing hole 22d of the bolt 40 does not appear, or any of the screwing holes 22c and 22d appears. You may comprise so that it may not.

  The notch depth of the thick portion 84 with respect to the inner direction of the center housing 22 does not have the thick portion 84 so that the original wall thickness of the center housing 22 is reduced and the strength of the shell integrated fixed scroll 28 is not reduced. It is preferable to limit to the outer peripheral surface of the center housing 22 in the case.

  In the present embodiment, the number of bolts 30 used to fasten the rear housing 24 is larger than the number of bolts 40 used to fasten the front housing 26. In order to form the joint hole 22 c in the wall of the center housing 22, an independent thick portion 88 extending from the proximal end surface 22 a of the center housing 22 toward the distal end surface 22 b is provided separately from the thick portion 84. The independent thick portion 88 has a step 88a in the axial direction by notching the independent thick portion 88 in the circumferential direction of the center housing 22 by lathe processing or the like, as in the notch with respect to the thick portion 84 described above. It may be formed.

  In addition, at the base end side end surface 22a of the center housing 22, as will be described later, at least two concave portions 22e that fit into the convex portions of the work table 92 at the time of finishing the integrated scroll 28, etc. are sufficiently separated from each other. It may be formed at the position.

Next, with reference to FIG. 5, a fixing method in finishing and the like of the shell integrated fixed scroll 28 will be described.
Finishing processing of the shell integrated fixed scroll 28 is performed by forming the outline of the shell integrated fixed scroll 28 by casting or forging using two movable and fixed molds, and then increasing the dimensional accuracy of the scroll wrap 12b and the like. In order to increase, it is applied by cutting and grinding. When finishing the shell integrated fixed scroll 28, etc., the shell integrated fixed scroll 28 is stably fixed in order to achieve a certain processing accuracy.

  Conventionally, when finishing processing or the like, the center housing 22 is sandwiched from the lateral direction and the shell-integrated fixed scroll 28 is fixed. However, there is a support structure that supports between the center housing 22 and the scroll wrap 12b. As a result, the center housing 22 may be deformed. For this reason, it becomes difficult to maintain good dimensional accuracy of the shell integrated fixed scroll 28, and the productivity of the scroll compressor 10 may be reduced. Therefore, in the present embodiment, the locking member 90 is locked to the first facing surface 86a, and a load in the axial direction is applied to the shell integrated fixed scroll 28 via the locking member 90. The one opposing surface 86a functions as an action point, so that the shell integrated fixed scroll 28 can be fixed from the axial direction.

  Specifically, when performing finishing or the like from the opening direction of the center housing 22 in the shell integrated fixed scroll 28 (for example, for the scroll wrap 12b or the like), the base end side end surface 22a of the center housing 22 is placed on the work table 92. The shell-integrated fixed scroll 28 is mounted and fixed on the work table 92 toward the mounting surface 92a. The shell-integrated fixed scroll 28 is placed on the work table 92, for example, by fitting a concave portion 22e formed on the base end side end surface 22a of the center housing 22 into a convex portion (not shown) provided in advance on the work table 92. For example, the shell integrated fixed scroll 28 may be positioned so as not to move on the work table 92 in a direction parallel to the placement surface 92a.

  The locking member 90 is a rigid member having a shape such that the one end portion 90a can be locked to the first facing surface 86a, such as an L shape. The one end portion 90a of the locking member 90 has a shape with a reduced contact area in order to increase the vertical drag due to contact with the first facing surface 86a so that it can be stably locked, Various known shapes and materials that increase the frictional force between the first facing surface 86a, such as a material having a relatively high friction coefficient disposed at a portion that contacts the surface 86a, can be used. An adjustment bolt 94 inserted through the through hole 92c of the work table 92 from the opposite surface 92b of the mounting surface 92a is screwed into the other end portion 90b of the locking member 90. The table 92 has a larger diameter than the through hole 92c. Not only the configuration of the locking member 90 as described above, but also a load can be applied toward the work table 92 to the first facing surface 86a of the shell integrated fixed scroll 28 placed on the work table 92. If present, the locking member may have any configuration.

  The shell integrated fixed scroll 28 is fixed to the work table 92 by using the locking member 90 to lock the adjustment bolt 94 by locking the one end 90a to the first facing surface 86a and screwing the other end 90b. Adjust and adjust. Accordingly, the head 94a of the adjustment bolt 94 presses the opposite surface 92b of the work table 92, and the one end portion 90a of the locking member 90 presses the first opposing surface 86a. Since the axial load is applied, the shell integrated fixed scroll 28 is pressed against the work table 92 and fixed. As described above, when the stepped portion 88a in the axial direction is formed in the independent thick portion 88, the locking member 90 is locked to the stepped portion 88a, and the shell integrated fixed scroll 28 is moved in the axial direction. A load may be applied.

  When finishing the base end side end surface 22a of the center housing 22 to which the rear housing 24 is fastened, the front end side end surface 22b of the center housing 22 that has not been subjected to finishing processing or the like is used as a work table. The shell-integrated fixed scroll 28 is mounted on the mounting surface 92a of the shell 92, and then the shell-integrated fixed scroll 28 is finished from the opening direction of the center housing 22 in the shell-integrated fixed scroll 28. May be fixed. That is, by using the locking member 90, the one end 90a of the locking member 90 is locked to the second facing surface 86b, and the tightening amount of the adjusting bolt 94 screwed to the other end 90b is adjusted, so that the shell The integral fixed scroll 28 can also be fixed to the work table 92.

According to such a scroll type compressor 10, in the shell integrated fixed scroll 28, the screw holes of the bolts 30 and the screw holes of the bolts 40 that are paired in the axial direction at positions where the angles around the central axis are the same. The thick portion 84 extending from the proximal end surface 22a to the distal end surface 22b of the center housing 22 is provided between the proximal end surface 22a and the distal end surface 22b of the center housing 22 in the thick portion 84. A part thereof is cut out in the circumferential direction of the center housing 22 to form an opposing surface 86 facing in the axial direction.
Therefore, the locking member 90 is locked to the facing surface 86, and a load in the axial direction is applied to the shell integrated fixed scroll 28 via the locking member 90, so that the shell integrated fixed scroll is applied. Since the 28 is fixed in the axial direction, the fixing structure of the shell integrated fixed scroll 28 is improved when finishing or the like is performed, and it becomes easy to maintain the dimensional accuracy of the shell integrated fixed scroll 28 satisfactorily. Improvement is possible.

  It is also conceivable to form a groove for locking the locking member 90 by notching the outer peripheral surface of the center housing 22 in the circumferential direction. However, when such a groove is formed, the shell is formed to reduce the weight. When the molding method of the integrally fixed scroll 28 is changed from casting to forging to reduce the wall thickness, the strength of the shell integrated fixed scroll 28 is lowered compared to that formed by casting, which is not preferable. However, according to the scroll compressor 10 of the present embodiment, the thick portion 84 provided to form the screw hole of the bolt 40 and the screw hole of the bolt 30 is notched in the circumferential direction and axially Since the opposing surface 86 is formed, the shell integrated fixed scroll 28 can be fixed in the axial direction without causing a decrease in strength of the shell integrated fixed scroll 28 by cutting out the wall of the center housing 22.

  In the above-described embodiment, as shown in FIG. 6, the screwing hole 22c of the first thick part 84a and the screwing hole 22b of the second thick part 84d are overlapped in the axial direction. May be. Then, if the screw holes of the bolts 30 are made the same as the spiral direction, diameter, pitch, etc. of the screw holes of the bolts 40, the front housing 26, the center housing 22 and the rear housing 24 can be formed with one type of bolt 40. Since they can be fastened together, the number of parts can be reduced.

  The scroll compressor 10 in the above-described embodiment is merely an application example of the present invention, and can be applied to any scroll compressor as long as it includes the above-described shell-integrated fixed scroll 28. Furthermore, as described above, the present invention can be applied not only to scroll type compressors but also to all scroll type fluid machines including scroll type expanders.

DESCRIPTION OF SYMBOLS 10 Scroll type compressor 12 Fixed scroll 12a End plate 12b Scroll lap 14 Orbiting scroll 22 Center housing 22a Base end side end surface 22b End side end surface 22c (First bolt) screw hole 22d (Second bolt) screw hole 24 Rear housing 26 Front housing 28 Shell-integrated fixed scroll 30 (First) bolt 40 (Second) bolt 84 Thick part 84a First thick part 84b Second thick part 86 Opposing surface 86a First opposing Surface 86b Second opposing surface 90 Locking member 90a One end 90b Other end t Center housing wall thickness

Claims (5)

A scroll type fluid machine having a turning scroll and a fixed scroll,
The fixed scroll is
A spiral scroll wrap erected from the end plate;
A cylindrical shell that is integrally formed with the end plate, has a base end connected to the outer periphery and the entire periphery of the end plate, and a distal end extends in the standing direction of the scroll wrap;
A wall of a part of the shell is formed thick from a base end side end surface of the shell to a front end side end surface of the shell, and the first housing is disposed in the thick wall of the shell. A threaded hole of a first bolt that is fastened to the end side end face extends from the base end side end face toward the distal end side end face, and a threaded hole of the second bolt that fastens the second housing to the distal end side end face is A thick portion extending from the distal end surface toward the proximal end surface;
Comprising
A scroll-type fluid characterized in that a part of the thick part is cut out in the circumferential direction of the shell between the base end side end face and the tip end side end face to form an opposing face in the axial direction. machine.   The said opposing surface functions as an action point where a locking member is locked and a load is applied to the fixed scroll in the axial direction via the locking member. Scroll type fluid machine.   The wall of the shell other than the thick portion is formed with a thickness that cannot be cut out in the circumferential direction in order to maintain the strength of the shell. The scroll type fluid machine according to 2.   The thickness of the wall of the shell other than the thick wall portion is such a thickness that the screw hole of the first bolt and the screw hole of the second bolt cannot be formed. The scroll type fluid machine as described.   The scroll fluid according to any one of claims 1 to 4, wherein the screw hole of the first bolt overlaps the screw hole of the second bolt in the axial direction. machine.