JP2016048054A - Scroll type fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type fluid machine that prevents a slide bush and a spring provided in an eccentric bushing from falling with simple constitution.SOLUTION: In a storage hole 58 of an eccentric bushing 36, a slide bushing 56 stored movably in an eccentric direction and a spring 61 energizing the slide bushing in a moving direction are stored. The slide bushing has a spring retaining part 56b and an engagement projection part 56a formed. The engagement projection part engages the eccentric bushing with the slide bush moved with energizing force of the spring after the slide bush is stored in the storage hole so as to stop the slide bushing from falling from the storage hole, and the spring retaining part stops the spring from falling from the storage hole.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a scroll type fluid machine that forms a working chamber of a working fluid between wraps of fixed and movable scrolls.

  This type of scroll type fluid machine includes a scroll unit including a movable scroll provided with a lap on the base surface and a fixed scroll provided with a wrap meshing with the lap of the movable scroll on the base surface. A single plate type compressor-integrated expander in which a working chamber of a unit is divided into a compression chamber and an expansion chamber by a partition wall to form a compression portion and an expansion portion is known (for example, see Patent Document 1).

  In such a scroll type fluid machine, it is necessary to maintain a very small clearance between the laps of the fixed scroll and the movable scroll, or to operate with the laps in contact with each other. If the center of each scroll is shifted due to the assembly accuracy, a gap is generated between the laps, and the performance is significantly deteriorated. Therefore, a structure has been developed that prevents the misalignment of each scroll by providing a slide bush that is movable in the eccentric direction in the eccentric bush that is inserted into the boss of the movable scroll, and urging the slide bush with a spring. (For example, refer to Patent Document 2).

Japanese Patent No. 5209964 Japanese Patent No. 3687279

  However, since the eccentric bush is slidable and rotatable with respect to the fixed shaft and the movable scroll, there is a problem that a slide bush and a spring provided in the eccentric bush fall off during operation.

  The present invention has been made to solve the conventional technical problems, and has a simple configuration in which a slide bush provided in an eccentric bush and a spring for urging the slide bush are dropped in order to adjust misalignment. An object of the present invention is to provide a scroll type fluid machine which is prevented by the above.

  In order to solve the above-described problems, a scroll type fluid machine according to the present invention includes a fixed scroll and a movable scroll each having a spiral wrap formed on each base surface of each substrate so as to face each other. The movable scroll is revolved and revolved to form a working chamber for the working fluid between the laps of the fixed scroll and the movable scroll, and the movable scroll is moved at the outer peripheral portion on the back side opposite to the base surface of the movable scroll. A frame having a pedestal that supports the scroll so as to be capable of revolving and revolving, and a support mechanism that supports the revolving and revolving motion of the movable scroll at the center of the back of the movable scroll. A boss provided on the back, an eccentric bush that is slidably and rotatably inserted into the boss, and formed on the eccentric bush A slide bush that is housed in the housing hole so as to be movable in the direction of eccentricity of the eccentric bush, and protrudes from the bottom surface of the frame, and is slidably inserted into an insertion hole formed in the slide bush. A fixed shaft, and a spring interposed between the slide bush and the eccentric bush in the storage hole and biasing the slide bush in the moving direction of the slide bush. An engaging protrusion protruding in the direction is formed, and the engaging protrusion engages with the eccentric bush while the slide bush is moved by the biasing force of the spring after the slide bush is stored in the storage hole. Thus, the slide bush is prevented from falling off from the storage hole, and the spring holding portion prevents the spring from falling off from the storage hole.

  According to a second aspect of the present invention, in the above-described scroll type fluid machine, the storage hole is formed through the eccentric bush, and the engaging projections are formed at both ends of the slide bush. In this state, the engaging protrusions engage with both opening edges of the storage hole of the eccentric bush.

  According to a third aspect of the present invention, there is provided the scroll type fluid machine according to each of the above inventions, wherein the storage hole is composed of a large diameter portion penetrating the eccentric bush and a small diameter portion continuous in the eccentric direction. Each of the portions located in the moving direction is formed at the peripheral edges of both ends of the bush, and after the slide bush is stored in the large diameter portion of the storage hole, the slide bush is moved into the small diameter portion by the biasing force of the spring. The engaging protrusions engage with both opening edges of the small-diameter portion of the storage hole, respectively, and each engaging protrusion of the portion located on the side opposite to the moving direction also serves as a spring holding portion.

  According to a fourth aspect of the present invention, there is provided the scroll type fluid machine according to the first aspect of the present invention, wherein the storage hole is formed through the eccentric bush, the engaging projection is formed at the other end of the slide bush, and the spring is attached. The slide bush engages with the opening edge of the storage hole in a state where the slide bush is moved by the force, and a fastener for preventing the slide bush and the spring from falling off is located at one end of the slide bush at the one end of the slide bush. It is attached.

  A scroll type fluid machine according to a fifth aspect of the present invention is characterized in that, in each of the above inventions, the spring holding portion has an inclined surface that is inclined downward toward the opening direction of the storage hole.

  According to a sixth aspect of the present invention, there is provided a scroll type fluid machine in which the scroll unit revolves the movable scroll by expanding the working fluid in an expansion chamber formed between the wraps of the fixed scroll and the movable scroll. The expansion section for recovering power and the compression chamber formed between the laps of both scrolls are provided with a compression section for compressing the working fluid by the power recovered by the expansion section.

  A scroll type fluid machine according to a seventh aspect of the present invention is characterized in that carbon dioxide is used as a working fluid in each of the above inventions.

  The scroll type fluid machine of the present invention comprises a fixed scroll and a movable scroll each having a spiral lap formed on each base surface of each substrate, and the movable scroll is revolved around the axis of the fixed scroll. The scroll unit that forms a working chamber for the working fluid between the laps of the fixed scroll and the movable scroll, and the outer peripheral part of the back surface on the opposite side of the base surface of the movable scroll is supported so as to be capable of revolving. And a support mechanism that supports the movable scroll in a revolving manner at the center of the back surface of the movable scroll, the support mechanism includes a boss provided on the back surface of the movable scroll, An eccentric bush that is slidably and rotatably inserted into the boss, and the eccentric bush is formed in a storage hole formed in the eccentric bush. A slide bush that is movably accommodated in the eccentric direction of the bush, a fixed shaft that protrudes from the bottom surface of the frame and is slidably and rotatably inserted into an insertion hole formed in the slide bush, The slide bush is formed between a slide bush and an eccentric bush, and includes a spring that urges the slide bush in the moving direction of the slide bush. The slide bush has a spring holding portion and an engaging projection protruding outward. The engaging protrusion is formed by engaging the eccentric bush while the slide bush is moved by the biasing force of the spring after the slide bush is received in the storage hole. The spring holding portion prevents the spring from falling out of the storage hole, so that the slide bush is moved in the eccentric direction by the biasing force of the spring. It is possible to eliminate the misalignment of the scroll by movement.

  At this time, the spring is held by the spring holding portion formed on the slide bush, and the engagement protrusion formed on the slide bush is engaged with the eccentric bush by the biasing force of the spring, thereby preventing the slide bush from falling off. That is, it is possible to prevent the slide bush and the spring from falling off the eccentric bush by simple processing, and the production cost can be reduced.

  In this case, the storage hole is formed through the eccentric bush as in the invention of claim 2 and the engaging protrusion is formed at both ends of the slide bush, and the slide bush is moved by the biasing force of the spring. If each engaging protrusion engages with both opening edges of the eccentric bushing storage hole, the slide bushing can be more securely removed from the eccentric bushing storage hole by engaging the engaging protrusions at both ends. Can be prevented.

  According to a third aspect of the present invention, the housing hole is composed of a large-diameter portion that is formed through the eccentric bush and a small-diameter portion that is continuous in the eccentric direction. After the slide bush is stored in the large diameter portion of the storage hole, each engagement protrusion of the portion located in the moving direction is in the storage hole in a state where the slide bush is moved into the small diameter portion by the biasing force of the spring. Even if each engaging projection on the opposite side of the moving direction engages with both opening edges of the small-diameter part and doubles as a spring holding part, the slide bush and the spring are stably eccentric. It is possible to prevent falling off by being held in the storage hole.

  According to a fourth aspect of the present invention, the storage hole is formed so as to penetrate the eccentric bush, the engaging protrusion is formed at the other end of the slide bush, and the storage hole is moved in a state where the slide bush is moved by the biasing force of the spring. A fastener for preventing the slide bush and the spring from falling off may be attached to one end portion of the slide bush, which is positioned outside the storage hole. In this case, it is only necessary to form the engaging protrusion only on the other end of the slide bush. After inserting the spring into the storage hole between the eccentric bush and the slide bush, the fastener is attached to one end of the slide bush. Since it is good, there exists an effect which an assembly operation becomes easy.

  Further, if the spring holding portion is formed with an inclined surface that is inclined downward toward the opening direction of the storage hole as in the invention of claim 5, the spring is stored between the eccentric bush and the slide bush by using the inclined surface. It becomes possible to insert into the hole, and the assembly work of the spring becomes extremely easy.

  Each of the above inventions is a single-plate scroll type fluid machine in which the expansion part and the compression part are integrated as in the invention of claim 6, particularly when carbon dioxide as in claim 7 is used as a working fluid. It is valid.

It is a vertical side view of the scroll type fluid machine of one example to which the present invention is applied. It is the top view which looked at the fixed scroll of FIG. 1 from the base surface side. It is the sectional view on the AA line of FIG. It is an enlarged view of the support mechanism part of FIG. (Example 1) which is the perspective view of the eccentric bush to which the slide bush of FIG. 1 was attached. It is a top view of the eccentric bush of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is a refrigerant circuit diagram of the refrigerating cycle of one Example using the scroll type fluid machine of FIG. It is a top view of the eccentric bush to which the slide bush of the other Example of this invention was attached (Example 2). It is the DD sectional view taken on the line of FIG. It is a top view of the eccentric bush to which the slide bush of another another Example of this invention was attached (Example 3). It is the EE sectional view taken on the line of FIG. It is a perspective view of the eccentric bush to which the slide bush of another another Example of this invention was attached (Example 4). It is a top view of the eccentric bush of FIG. It is the FF sectional view taken on the line of FIG. It is the GG sectional view taken on the line of FIG.

  Hereinafter, embodiments of the present invention will be described in detail.

(1) Overall Structure of Scroll Type Fluid Machine 1 FIG. 1 shows a vertical side view of the scroll type fluid machine 1 of the embodiment. The scroll type fluid machine 1 according to the embodiment is, for example, a vertically installed single-plate type compressor-integrated expander, and a refrigeration cycle such as a heat pump using carbon dioxide having a high pressure side as a supercritical pressure as a refrigerant (working fluid). Used for RC (shown in FIG. 9). Although the configuration of the refrigeration cycle RC will be described in detail later, the scroll fluid machine 1 according to the embodiment is incorporated in an air conditioner, a heat pump type hot water heater, or the like (not shown), and the expansion unit described later performs an expansion operation by the pressure of the refrigerant. 2 and a later-described compressing unit 3 (lower stage side) that performs a compressing operation by the expanding operation of the expanding unit 2 (FIG. 2).

  The scroll fluid machine 1 includes a housing 4. In the housing 4, a scroll unit 8 mainly composed of a fixed scroll 6 and a movable scroll 7 that revolves around the fixed scroll 6, and a main frame that supports the movable scroll 7 so as to be capable of revolving revolving motion. Frame) 9 and a fixed shaft 11 which is fixed to the bottom surface of the main frame 9 and protrudes from the bottom surface of the main frame 9.

  The housing 4 includes a main shell 12 serving as a main body, a cap-shaped top shell 13 that covers the upper portion of the main shell 12, and a cap-shaped bottom shell 14 that covers the lower portion of the main shell 12. The housing 4 is assembled by fastening the top shell 13 and the bottom shell 14 together with bolts so as to sandwich the main shell 12 via a sealing material such as an O-ring, and the inside is sealed from the outside. The outer periphery of the main frame 9 is fixed inside the main shell 12. In the hermetically sealed housing 4, a pressure obtained by compressing the refrigerant (carbon dioxide) taken in from the refrigeration cycle RC as the working fluid of the scroll type fluid machine 1 by the compression unit 3 is acting.

  The top shell 13 is connected to an expansion side suction pipe 16 that sucks the refrigerant taken in from the refrigeration cycle RC into the expansion section 2. The main shell 12 includes an expansion-side discharge pipe 17 that discharges the refrigerant expanded in the expansion unit 2 toward the refrigeration cycle RC, and a compression that discharges the refrigerant compressed in the compression unit 3 toward the refrigeration cycle RC. A side discharge pipe 18 is connected. The ends of the expansion side suction pipe 16 and the expansion side discharge pipe 17 are opened and communicated with an expansion side suction chamber 19 and an expansion side discharge chamber 21 formed in the substrate 6 a of the fixed scroll 6, respectively. An end portion of the pipe 18 opens into the main shell 12 and communicates with the compression side discharge chamber 22 formed inside the top shell 13 through the main shell 12.

  The main shell 12 is connected to a compression side suction pipe 23 (shown in FIG. 3, which is located on the near side in FIG. 1) that sucks the refrigerant taken in from the refrigeration cycle RC into the compression unit 3. The end of the suction pipe 23 is opened and communicated with a compression side suction chamber 24 formed in the substrate 6 a of the fixed scroll 6.

  On the other hand, a lubricating oil chamber 26 is formed inside the bottom shell 14, and lubricating oil for lubricating the scroll unit 8 is stored in the lubricating oil chamber 26. The compression side suction chamber 23 is provided with an oil feed hole 27 (FIG. 2) penetrating the substrate 6 a and the main frame 9 of the fixed scroll 6, and the lubricating oil chamber 26 is formed through the oil feed hole 27. The lubricating oil is supplied to the compression side suction chamber 24.

  An oil supply passage 28 is bored in the fixed shaft 11 along the axial direction of the fixed shaft 11. The lower end of the oil supply passage 28 opens into the lubricating oil chamber 26, and the upper end is a boss (recessed portion) described later. ) It is opened in the space in 31.

  The fixed scroll 6 is fixed to the upper surface portion 9a of the main frame 9, and a compression side discharge hole 32, which will be described later, is located slightly in the radial direction of the fixed scroll 6 with respect to the compression side suction chamber 24 of the substrate 6a of the fixed scroll 6 described above. Is formed through. An oil separator 33 for separating the lubricating oil in the refrigerant is attached to the opening of the compression side discharge hole 32 with respect to the compression side discharge chamber 22.

  The movable scroll 7 is supported on the pedestal portion 9b of the main frame 9 via a rotation preventing mechanism 34 such as an Oldham ring so as to be capable of revolving without rotating. This rotation prevention mechanism 34 is inserted into the pedestal portion 9b, and is slidably connected to the back surface 7c, which is the surface opposite to the base surface 7b of the substrate 7a, along with the revolving turning motion of the movable scroll 7. Further, on the rear surface 7c of the movable scroll 7, the above-described cylindrical boss 31 into which an eccentric bush 36, which will be described later, is slidably and rotatably inserted is provided.

  Here, the scroll unit 8 of the embodiment can form both the compression unit 3 and the expansion unit 2 as a refrigerant working chamber by a pair of fixed scroll 6 and movable scroll 7 in the compressor-integrated expander. In other words, it is a so-called single-plate scroll unit, and the fixed shaft 11 only supports the movable scroll 7 together with the main frame 9 so as to be capable of revolving, and the fixed shaft 11 itself is not rotationally driven.

  In detail, as shown in FIG. 2, an annular intermediate partition wall (annular wall) 38 and an annular outer partition wall 39 are erected on the base surface 6 b of the fixed scroll 6. A spiral outer fixed scroll wrap (wrap) 40 is provided between the partition wall 39 and a spiral inner fixed scroll wrap (wrap) 41 on the center side of the intermediate partition wall 38. Further, an annular groove 42 into which a seal ring (not shown) is inserted is recessed in the end surface of the intermediate partition wall 38 on the base surface 6b.

  On the substrate 6 a of the fixed scroll 6, the above-described compression side suction chamber 24 is formed at the outer peripheral end of the compression portion 3 slightly inside the outer partition wall 39, and the inner peripheral end of the compression portion 3 slightly outside the intermediate partition wall 38. A compression-side discharge hole 32 is formed in the upper part. In addition, the expansion side discharge chamber 21 described above is formed on the outer peripheral end of the expansion portion 2 slightly inside the intermediate partition wall 38 on the substrate 6a, and the expansion side suction chamber 19 described above is the inner peripheral end of the expansion portion 2. It is formed at the center. Furthermore, an annular oil groove 43 is formed on the substrate 6a slightly outside the outer partition wall 39, and is countersunk at a predetermined depth with a diameter larger than the groove width provided on the oil groove 43. The oil feed hole 27 described above is formed on the bottom surface of the formed recess.

  On the other hand, on the base surface 7 b of the movable scroll 7, a spiral outer movable scroll wrap (wrap) 44 that meshes with the outer fixed scroll wrap 40 and a spiral inner movable scroll wrap (wrap) that meshes with the inner fixed scroll wrap 41. ) 46 is erected in the direction of the opposite spiral.

  According to the scroll unit 8 described above, the expansion portion 2 is formed inside the intermediate partition wall 38, and the compression portion 3 is formed between the intermediate partition wall 38 and the outer partition wall 39. Specifically, as indicated by solid line arrows in FIG. 1, the refrigerant sucked from the expansion side suction pipe 16 is taken into the expansion portion 2 through the expansion side suction chamber 19 and the scrolls 6 and 7 cooperate with each other. By this, it is expanded in an expansion chamber (working chamber) formed between the laps 41 and 46. The volume of the expansion chamber is increased while moving toward the outer peripheral side of each of the scrolls 6, 7, and accordingly, the movable scroll 7 is revolved around the axis of the fixed scroll 6. The refrigerant used for the revolving orbiting movement of the movable scroll 7 is discharged toward the refrigeration cycle RC outside the housing 4 through the expansion side discharge chamber 21 via the expansion side discharge chamber 21.

  On the other hand, the refrigerant sucked from the compression side suction pipe 23 is taken into the compression section 3 through the compression side suction chamber 24, and the movable scroll 7 moves around the axis of the fixed scroll 6 along with the expansion of the refrigerant in the expansion chamber described above. , The scrolls 6 and 7 are compressed in a compression chamber (working chamber) formed between the laps 40 and 44 by cooperating with each other. The volume of the compression chamber is reduced while moving toward the center of each of the scrolls 6 and 7 as the orbiting scroll 7 revolves. As the volume of the compression chamber decreases, the high-pressure refrigerant is discharged toward the refrigeration cycle RC outside the housing 4 via the compression-side discharge hole 32 and the compression-side discharge chamber 22 and the compression-side discharge pipe 18. The

  Further, in this process, as indicated by a dotted arrow in FIG. 1, the refrigerant discharged from the compression-side discharge hole 32 to the compression-side discharge chamber 22 causes the lubricating oil in the refrigerant to pass through the oil separator 33. To be separated. The lubricating oil separated from the refrigerant is stored in the lubricating oil chamber 26 through an oil return path 47 formed in the main frame 9.

  Lubricating oil stored in the lubricating oil chamber 26 rises in the oil supply passage 28 due to a pressure difference between the lubricating oil chamber 26 and the compression side suction chamber 24, and is discharged from the upper end of the fixed shaft 11. After lubricating the bearing 51, it reaches the back pressure chamber 52 formed between the pedestal 9 b of the main frame 9 and the back surface 7 c of the movable scroll 7, and reaches the compression side suction chamber 24 through the oil feed hole 27.

(2) Refrigeration cycle RC
Next, FIG. 9 shows a refrigerant circuit diagram of a refrigeration cycle RC (example) using the scroll type fluid machine 1 of the present invention. In this figure, for the sake of explanation, the expansion portion 2 and the compression portion 3 of the scroll type fluid machine 1 are shown separately. The compression unit 3 driven by the power recovered by the expansion unit 2 of the scroll type fluid machine 1 constitutes a low-stage compressor (low-stage compression unit) in the refrigeration cycle RC. The above-described compression-side discharge pipe 18 of the compression unit 3 is connected to a high-stage side compression unit 70 a that is driven by an electric motor 70 b of a high-stage side compressor 70 that is located downstream of the compression unit 3.

  A gas cooler 71 for cooling the refrigerant is connected to the subsequent stage of the compression unit 70a. Between the outlet of the gas cooler 71 and the inlet of the evaporator 73, the expansion unit 2 and the expansion valve 72 of the scroll type fluid machine 1 are connected in parallel. It is connected. The refrigerant from the gas cooler 71 is taken into the expansion side suction chamber 19 of the expansion unit 2 from the expansion side suction pipe 16 described above. Further, the refrigerant is sent from the expansion section 2 of the scroll type fluid machine 1 to the evaporator 73 via the expansion side discharge pipe 17. The refrigerant discharged from the evaporator 73 is sucked into the compression unit 3 of the scroll type fluid machine 1 from the compression side suction pipe 23.

  Next, the operation of the refrigeration cycle RC including the scroll fluid machine 1 will be described. The intermediate pressure refrigerant (carbon dioxide refrigerant) boosted by the low-stage compression section 3 driven by the expansion section 2 of the scroll type fluid machine 1 is sent from the compression-side discharge pipe 18 to the high-stage compressor 70. Further, the pressure is further increased by the compression unit 70a driven by the electric motor 70b, and becomes high pressure (supercritical). After the high-pressure refrigerant is cooled by the gas cooler 71 in a supercritical state, a part of the refrigerant is taken into the expansion portion 2 of the scroll type fluid machine 1 from the expansion side suction pipe 16 and is decompressed and decompressed.

  The remaining refrigerant is sent to the expansion valve 72 and is decompressed and decompressed. The expansion valve 72 is provided for adjusting the flow rate of the refrigerant passing through the expansion portion 2 of the scroll type fluid machine 1.

  As the refrigerant expands isentropically in the expansion section 2, the movable scroll 7 revolves and the power is recovered. The revolving orbiting motion of the movable scroll 7 causes the compressor 3 to operate as a low-stage compressor. The refrigerant expanded in the expansion section 2 is heated by the evaporator 73 (or the object is thereby cooled), and is again sucked into the compression section 3 of the scroll type fluid machine 1 through the compression side suction pipe 23.

  Thus, the compression unit 3 of the scroll type fluid machine 1 is responsible for a part of the compression process of the refrigeration cycle RC (low stage side), and the compression part 70a of the high stage side compressor 70 is the rest of the compression process (high stage). Side). The compression power in the compression unit 3 is covered by the recovery power in the expansion unit 2.

(3) Back pressure of the movable scroll 7 In the back pressure chamber 52 of the scroll type fluid machine 1, the sliding portion between the rotation prevention mechanism 34 and the base portion 9b and the back surface 7c of the movable scroll 7 is lubricated by the lubricating oil. Further, since the inside of the housing 4 is maintained at the discharge pressure of the compression unit 3 discharged from the compression side discharge hole 32 to the compression side discharge chamber 22 as described above, this compression is applied to the back pressure chamber 52 via the oil supply passage 28. Lubricating oil maintained at a pressure close to the discharge pressure of the section 3 is supplied. Accordingly, the movable scroll 7 from the back pressure chamber 52 is pressed and urged against the fixed scroll 6 by the discharge pressure of the compression unit 3. The back pressure from the back pressure chamber 52 enables smooth revolving motion of the movable scroll 7 with respect to the fixed scroll 6.

  Thus, in the scroll type fluid machine 1, the scroll unit 8 is driven by the expansion energy of the refrigerant, and the compression energy of the refrigerant is generated by the driving force of the scroll unit 8. At this time, as described above, the fixed shaft 11 constitutes the support mechanism 54 that supports the movable scroll 7 together with the main frame 9 at the center of the back surface 7c so as to be capable of revolving.

(4) Configuration of Support Mechanism 54 Specifically, as shown in the enlarged sectional view of the support mechanism 54 of the movable scroll 7 in FIG. 4, the upper end portion of the fixed shaft 11 is placed in the insertion hole 57 of the slide bush 56 and the bearing 49. The slide bush 56 is inserted into a cylindrical fitting insertion portion 36a located in the center portion of the eccentric bush 36 in a storage hole 58 formed in the axial direction thereof. The eccentric bush 36 is accommodated so as to be movable in the eccentric direction. That is, the upper end portion of the fixed shaft 11 is inserted into the eccentric bush 36 via the slide bush 56.

  And the insertion part 36a of the eccentric bush 36 is inserted in the boss | hub 31 through the bearing 48 so that sliding and rotation are possible. The bearing 48 receives a radial load that acts on the eccentric bush 36 as the orbiting scroll 7 revolves. Further, a flange portion 36b having a diameter larger than the diameter of the boss 31 is formed at the lower end of the fitting insertion portion 36a of the eccentric bush 36, and a bearing 51 is disposed between the flange portion 36b and the main frame 9. ing. Further, a balance weight 59 having an L-shaped cross section is integrally formed on the flange portion 36b, and the balance weight 59 is rotated in accordance with the revolving orbiting motion of the movable scroll 7 in the space between the movable scroll 7 and the main frame 9. .

  As described above, the fixed shaft 11 supports the movable scroll 7 through the bearing 49, the slide bush 56, the eccentric bush 36, the bearing 48, and the bearing 51 so as to be capable of revolving, and the support mechanism 54 includes the boss 31, The eccentric bush 36, the slide bush 56, the fixed shaft 11, and a spring 61 to be described later are configured.

(5) Configuration of Eccentric Bush 36, Slide Bush 56, and Spring 61 Next, the eccentric bush 36, the slide bush 56, and the spring 61 that constitute the support mechanism 54 will be described with reference to FIGS. One embodiment will be described in detail. The storage hole 58 of the eccentric bush 36 is formed through a fitting insertion portion 36a located at the center of the eccentric bush 36, and has a long cross-sectional shape in the eccentric direction of the eccentric bush 36 as shown in each drawing. . In this case, the storage hole 58 is formed with a pair of flat surfaces 58a that extend in the eccentric direction and face each other. Engagement recesses 58b are formed at both ends of the opening of the storage hole 58 at one end in the eccentric direction.

  On the other hand, the slide bush 56 has a substantially cylindrical shape in which the aforementioned storage hole 58 is formed through the center thereof, and the bearing 49 is attached to the inner wall surface of the storage hole 58. Engaging protrusions 56a are formed at both ends in the axial direction of the storage hole 58 of the slide bush 56 so as to protrude outwardly at one end in the eccentric direction of the eccentric bush 36. The other end is formed with a spring holding portion 56b that is recessed leaving both ends in the axial direction. Further, both side walls of the slide bush 56 positioned in the eccentric direction of the eccentric bush 36 are a pair of flat surfaces 56c.

  Further, the spring 61 is constituted by a plate spring having a cross-sectional shape as shown in FIG. 8, and is provided in the spring holding portion 56 b in which the slide bush 56 is recessed. With the spring 61 provided in the spring holding portion 56b as described above, the slide bush 56 is mounted in the accommodation hole 58 formed through the fitting insertion portion 36a of the eccentric bush 36. At this time, the slide bush 56 is first inserted into the accommodation hole 58 by compressing the spring 61 and moving toward the other end side in the eccentric direction of the eccentric bush 36.

  At this time, the dimension from the outer end of the wall at both ends of the spring holding portion 56b of the slide bush 56 to the outer end of the engaging projection 56a is smaller than the dimension of the storage hole 58 in the direction. Further, the flat surface 56 c of the slide bush 56 is sized so as to slidably contact the inside of the flat surface 58 a of the storage hole 58. Further, the spring 61 is interposed between the slide bush 56 and the eccentric bush 36 in the storage hole 58, whereby the slide bush 56 is inserted into the storage hole 58 movably in the eccentric direction of the eccentric bush 36. The

  After the slide bush 56 is housed in the housing hole 58 in this way, when the compression of the spring 61 is released, the spring 61 biases the slide bush 56 in the eccentric direction of the eccentric bush 36 by the restoring force. The slide bush 56 moves, and both engaging protrusions 56a on one end side in the eccentric direction enter into both engaging recesses 58b at the opening edge of the storage hole 58 of the eccentric bush 36 and engage with each other (in FIG. 7). State).

  In this state, the slide bush 56 is housed in the housing hole 58 of the eccentric bush 36 so as to be movable in the eccentric direction of the eccentric bush 36, and the slide bush 56 is always biased in the eccentric direction of the eccentric bush 36 by the spring 61. Will be. Further, since both the engaging protrusions 56 a of the slide bush 56 are engaged in the engagement recess 58 b of the storage hole 58, the slide bush 56 is prevented from dropping from the eccentric bush 36. Furthermore, since the spring 61 is located in the spring holding portion 56b of the slide bush 56 and is stretched between the slide bush 56 and the eccentric bush 36, the spring 61 is also prevented from falling off the eccentric bush 36.

  The upper end of the fixed shaft 11 is inserted into the bearing 49 inside the insertion hole 57 of the slide bush 56 attached to the eccentric bush 36 in this way, and slides and rotates with respect to the insertion hole 57 of the slide bush 56. It will be possible. 2 is an axis of the fixed scroll 6 and the fixed shaft 11 (slide bush 56), and L1 shown in FIG. 6 is a line passing through the axis X1. L2 shown in FIG. 6 is a line passing through the axis of the movable scroll 7 and the eccentric bush 36, and the difference between L1 and L2 is the eccentric amount of the movable scroll 7 with respect to the fixed scroll 6 (the same applies to the following embodiments).

  Then, the eccentric amount of the movable scroll 7 with respect to the fixed scroll 6 and the fixed shaft 11 is adjusted by moving the slide bush 56 in the eccentric direction of the eccentric bush 36 while being urged by the spring 61, and the movable scroll 7 with respect to the fixed scroll 6 is adjusted. This will eliminate the misalignment. In addition, it is assumed that the engagement between the engagement protrusion 56a and the engagement recess 58b is not released by the movement of the slide bush 56 during operation (the same applies to the following embodiments).

  As described above, the support mechanism 54 for supporting the movable scroll 7 so as to be capable of revolving is provided with the boss 31 provided on the back surface of the movable scroll 7 and the eccentrically inserted into the boss 31 so as to be slidable and rotatable. A bush 36, a slide bush 56 housed in a housing hole 58 formed in the eccentric bush 36 movably in the eccentric direction of the eccentric bush 36, and a bottom surface of the frame 9, projecting from the slide bush 56. The fixed shaft 11 that is slidably and rotatably inserted into the formed insertion hole 57 and the slide bush 56 and the eccentric bush 36 in the storage hole 58 are interposed between the slide bush 56 and the slide bush 56 in the moving direction. The slide bush 56 is formed with a spring holding portion 56b and an engaging protrusion 56a protruding outward, The mating protrusion 56a is engaged with the engagement recess 58b of the storage hole 58 of the eccentric bush 36 in a state where the slide bush 56 is moved by the biasing force of the spring 61 after the slide bush 56 is stored in the storage hole 58. Thus, the slide bush 56 is prevented from falling off from the storage hole 58 and the spring holding portion 56b is prevented from falling off the spring 61 from the storage hole 58. The misalignment of the scrolls 6 and 7 can be eliminated by the movement of 56 in the eccentric direction.

  At this time, the spring 61 is held by the spring holding portion 56b formed on the slide bush 56, and the engaging projection 56a similarly formed on the slide bush 56 is formed in the accommodation hole 58 of the eccentric bush 36 by the biasing force of the spring 61. The slide bush 56 is prevented from falling off by engaging with the engagement recess 58b. That is, it is possible to prevent the slide bush 56 and the spring 61 from falling off from the eccentric bush 36 by a simple process of forming the spring holding portion 56b in the slide bush 56 and forming the engaging projection 56a. Thus, the production cost can be reduced.

  In particular, in this embodiment, the storage hole 58 is formed through the fitting insertion portion 36 a of the eccentric bush 36, and the engaging protrusions 56 a are formed at both ends of the slide bush 56, and the slide bush 56 56 is biased by the biasing force of the spring 61. In this state, the engagement protrusions 56a engage with the engagement recesses 58b formed at both opening edges of the storage hole 58 of the eccentric bush 36, respectively. It becomes possible to prevent the slide bush 56 from falling off from the accommodation hole 58 of the eccentric bush 36 more reliably by the engagement of the portion 56a.

(6) Other Examples of Slide Bush 56 Next, another example of the slide bush 56 will be described with reference to FIGS. 10 and 11. The shapes of the eccentric bush 36 and the spring 61 are the same as those in the first embodiment (FIGS. 5 to 8). In this case, the slide bush 56 has an inclined surface 62 inclined to the opening direction of the accommodation hole 58 on the wall (indicated by 56d in FIGS. 10 and 11) of one axial end portion constituting the spring holding portion 56b. Is formed.

  In addition, the height of the wall 56d is also low, and thus the wall 56d has a hook shape that is pointed toward the opening direction of the storage hole 58. Other configurations are the same as those in the first embodiment. By forming such an inclined surface 62, when the spring 61 is mounted in the spring holding portion 56b, the spring 61 is pushed into the accommodation hole 58 between the slide bush 56 and the eccentric bush 36 using the inclined surface 62. It becomes possible.

  That is, according to this embodiment, after the slide bush 56 is stored in the storage hole 58 of the eccentric bush 36, the spring 61 is stored between the eccentric bush 36 and the slide bush 56 using the inclined surface 62 of the wall 56d. It can be inserted into the hole 58. Since the inserted spring 61 engages with the vertical wall surface of the wall 56d opposite to the inclined surface 62, it is prevented from falling off. Thereby, as compared with the case where the slide bush 56 is housed in the housing hole 58 with the spring 61 provided in the spring holding portion 56b as in the above embodiment, the assembly work of the slide bush 56 and the spring 61 is extremely easy. It becomes.

(7) Other Embodiments of Eccentric Bush 36, Slide Bush 56, and Spring 61 Next, still another implementation of the eccentric bush 36, the slide bush 56, and the spring 61 will be described with reference to FIGS. An example will be described. In this case, the shape of the spring 61 is a cylindrical shape crushed into an arc shape as shown in FIG. Also in this case, the storage hole 58 of the eccentric bush 36 is formed so as to penetrate in the axial direction of the fitting insertion portion 36a. In this embodiment, the storage hole 58 includes a large-diameter portion 63a which is a circular hole having a large inner diameter, and The small-diameter portion 63b is a circular hole having a smaller inner diameter, and the small-diameter portion 63b is continuous with the large-diameter portion 63a in the eccentric direction of the eccentric bush 36 (the moving direction of the slide bush 56). The engagement recess 58b is formed in a paragraph at portions corresponding to both opening edges of the small diameter portion 63b.

  On the other hand, the slide bush 56 has a cylindrical shape, and an engaging projection 56a is formed on the peripheral edge of both ends in the axial direction so as to protrude outward in a flange shape. The outer diameter of the slide bush 56 is smaller than the inner diameter of the small-diameter portion 63b of the storage hole 58, and the outer diameter of the engaging protrusion 56a is sufficiently smaller than the inner diameter of the large-diameter portion 63a of the storage hole 58. It is larger than the inner diameter. Further, the inner diameter of the engagement recess 58b is larger than the outer diameter of the engagement protrusion 56a. Other configurations are the same as those of the above-described embodiment.

  Further, as shown in FIG. 13, the spring 61 is provided in a compressed state between the engaging projections 56a at both ends so as to be on the side opposite to the small diameter portion 63b (the side opposite to the moving direction). The slide bush 56 is inserted into the large-diameter portion 63 a of the storage hole 58 with the spring 61 provided between the engaging protrusions 56 a at both ends.

  At this time, since the outer diameter of the engaging protrusion 56a of the slide bush 56 is sufficiently smaller than the inner diameter of the large diameter portion 63a of the storage hole 58, it can be inserted into the large diameter portion 63a without any trouble.

  When the spring 61 is inserted after the slide bush 56 is stored in the storage hole 58 in this way, the spring 61 biases the slide bush 56 in the eccentric direction of the eccentric bush 36 by a restoring force, so that the small diameter portion 63b is inserted. The slide bush 56 moves, and both engaging protrusions 56a on one end side in the eccentric direction enter into both engaging recesses 58b at the opening edge of the small diameter portion 63b and engage with each other (states of FIGS. 12 and 13). ).

  In this state, the slide bush 56 is housed in the housing hole 58 of the eccentric bush 36 so as to be movable in the eccentric direction of the eccentric bush 36, and the slide bush 56 is always biased in the eccentric direction of the eccentric bush 36 by the spring 61. Will be. Moreover, since both the engagement protrusions 56a of the slide bush 56 engage in the engagement recess 58b of the small diameter portion 63b, the slide bush 56 is prevented from falling off the eccentric bush 36. Further, since the spring 61 is located between the engaging projections 56 a on the opposite side of the small-diameter portion 63 b of the slide bush 56 and is stretched between the eccentric bush 36, the spring 61 is separated from the eccentric bush 36. Dropping is also prevented.

  As described above, in the third embodiment, the storage hole 58 includes the large-diameter portion 63a formed through the eccentric bush 36 and the small-diameter portion 63b continuous therewith in the eccentric direction, and the engaging protrusion 56a is formed as the slide bush 56. After the slide bush 56 is stored in the large diameter portion 63a of the storage hole 58, the slide bush 56 is moved into the small diameter portion 63b by the urging force of the spring 61, and is positioned in the moving direction. The engaging projections 56a of the portions to be engaged are respectively engaged in the engaging recesses 58b formed at both opening edges of the small diameter portion 63b of the storage hole 58, and the portions of the portions located on the opposite side to the moving direction are respectively engaged. Since the engaging protrusion 56a also serves as a spring holding portion for holding the spring 61, it is possible to stably hold the slide bush 56 and the spring 61 in the accommodation hole 58 of the eccentric bush 36 to prevent the drop. To become. Further, since the slide bush 56 has a cylindrical shape, the processing cost is reduced.

(8) Other Embodiments of the Eccentric Bush 36, the Slide Bush 56, and the Spring 61 Next, still another embodiment of the eccentric bush 36, the slide bush 56, and the spring 61 will be described with reference to FIGS. Examples will be described. In this embodiment, an oval storage hole 58 having the same diameter as the small diameter portion 63b of the third embodiment of FIGS. 12 and 13 is formed in the fitting insertion portion 36a of the eccentric bush 36. This ellipse is long in the eccentric direction of the eccentric bush 36. Further, the engagement protrusion 56a around one end of the slide bush 56 in the axial direction is omitted. Instead, one end of the axial slide bush 56 protrudes out of the storage hole 58 as shown in FIG. A groove 64 is formed in the periphery of the protruding portion. The groove 64 has a structure in which a C-shaped fastener (clip) 66 as shown in FIGS. 14 and 15 is fitted. Further, the engagement recess 58b on one end side in the axial direction of the accommodation hole 58 of the eccentric bush 36 is not formed. Other configurations are the same as those of the above-described embodiment.

  In this embodiment, the slide bush 56 is first inserted into the storage hole 58 from the other end side of the storage hole 58 without providing the spring 61. Thereafter, the spring 61 is inserted in a compressed state between the engaging projection 56a at the other end and the groove 64 so that the spring 61 is opposite to the moving direction as shown in FIG. When the spring 61 is inserted, the slide bush 56 is biased in the eccentric direction of the eccentric bush 36 by the restoring force of the spring 61, so that the slide bush 56 moves, and the engagement protrusion 56a on one end side in the eccentric direction opens. It enters into the engagement recess 58b of an edge and engages (state of FIG. 16).

  With the spring 61 inserted in this way, the groove 64 of the slide bush 56 is located outside the storage hole 58. In this state, the fastener 66 is fitted into the groove 64. The fastener 66 is engaged with the eccentric bush 36 on one end side in the axial direction of the slide bush 56, and this engagement relationship is not released by the movement of the slide bush 56. Moreover, since the fastener 66 is located on one end side of the spring 61, it constitutes a spring holding portion together with the engaging projection 56a located on the other end side. This prevents the slide bush 56 and the spring 61 from falling off.

  In this way, the storage hole 58 is formed through the eccentric bush 36, the engagement protrusion 56 a is formed at the other end of the slide bush 56, and the slide bush 56 is moved by the biasing force of the spring 61. A fastener 66 is attached to one end portion of the slide bush 56 to prevent the slide bush 56 and the spring 61 from falling off at one end of the slide bush 56 while engaging with the engagement recess 58b at the opening edge. Therefore, the engaging protrusion 56a may be formed only on the other end of the slide bush. After the spring 61 is inserted into the storage hole 58 between the eccentric bush 36 and the slide bush 56, the fastener 66 is moved to the slide bush. Since it should just be attached to the one end part of 56, an assembly operation becomes easy.

  In the embodiment, the present invention is applied by taking a so-called single-plate compressor-integrated scroll expander as an example of a scroll type fluid machine, but the invention of claim 1 to claim 5 is not limited thereto, The present invention is also effective for a scroll type fluid machine or the like in which a compression unit is connected to a drive shaft.

DESCRIPTION OF SYMBOLS 1 Scroll type fluid machine 2 Expansion part 3 Compression part (low stage side)
6 fixed scroll 7 movable scroll 8 scroll unit 9 main frame 11 fixed shaft 31 boss 36 eccentric bush 40, 41, 44, 46 lap 49 bearing 54 support mechanism 56 slide bush 56a engagement protrusion 57 insertion hole 58 storage hole 58b engagement Recess 61 Spring 63a Large diameter part 63b Small diameter part 66 Fastener RC Refrigerating cycle

Claims (7)

A fixed scroll and a movable scroll each having a spiral wrap formed on each base surface of each substrate so as to face each other. A scroll unit that forms a working chamber for the working fluid between the laps,
A frame having a pedestal that supports the orbiting scroll so as to be capable of revolving orbiting at the outer periphery of the back surface opposite to the base surface of the orbiting scroll;
A support mechanism for supporting the orbiting scroll so as to be capable of revolving orbiting at the center of the back of the orbiting scroll;
The support mechanism is
A boss provided on the back surface of the movable scroll;
An eccentric bushing slidably and rotatably inserted into the boss;
A slide bush housed in a housing hole formed in the eccentric bush so as to be movable in an eccentric direction of the eccentric bush;
A fixed shaft that protrudes from the bottom surface of the frame and is slidably and rotatably inserted into an insertion hole formed in the slide bush;
It is interposed between the slide bush and the eccentric bush in the storage hole, and is composed of a spring that biases the slide bush in the moving direction of the slide bush,
The slide bush is formed with a spring holding portion and an engaging protrusion protruding outward,
After the slide bush is accommodated in the accommodation hole, the engagement protrusion is engaged with the eccentric bush in a state where the slide bush is moved by the biasing force of the spring. The scroll fluid machine according to claim 1, wherein the slide bush is prevented from falling off, and the spring holding portion prevents the spring from dropping out of the storage hole. The storage hole is formed through the eccentric bush.
The engaging protrusions are formed at both ends of the slide bush,
2. The scroll according to claim 1, wherein in a state where the slide bush is moved by the biasing force of the spring, the engagement protrusions engage with both opening edges of the accommodation hole of the eccentric bush. Type fluid machine. The storage hole is composed of a large-diameter portion that is formed through the eccentric bush and a small-diameter portion that is continuous in the eccentric direction.
The engaging protrusion is formed on the peripheral edge of both ends of the slide bush,
After the slide bush is stored in the large-diameter portion of the storage hole, each of the engaging protrusions of the portion located in the moving direction in a state where the slide bush is moved into the small-diameter portion by the biasing force of the spring. Are engaged with both opening edges of the small-diameter portion of the storage hole, and the engaging protrusions of the portion located on the opposite side of the moving direction also serve as the spring holding portion. The scroll type fluid machine according to claim 1 or 2. The storage hole is formed through the eccentric bush,
The engaging protrusion is formed at the other end of the slide bush, and engages with the opening edge of the storage hole in a state where the slide bush is moved by the biasing force of the spring.
The scroll type fluid machine according to claim 1, wherein a fastener for preventing the slide bush and the spring from falling off is attached to one end portion of the slide bush.   The scroll type fluid machine according to any one of claims 1 to 4, wherein the spring holding portion has an inclined surface that is inclined downward toward an opening direction of the storage hole. The scroll unit is
An inflating portion for recovering power by revolving orbiting the movable scroll by expanding a working fluid in an expansion chamber formed between the laps of the fixed scroll and the movable scroll;
The compression chamber formed between the laps of the two scrolls is provided with a compression section that compresses the working fluid by the power recovered by the expansion section. A scroll type fluid machine according to any one of the above.   The scroll type fluid machine according to any one of claims 1 to 6, wherein carbon dioxide is used as the working fluid.

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