JP2014196690A - Fixed scroll body and scroll type fluid machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve low costs in a fixed scroll body and facilitate positioning between the fixed scroll body and a revolving scroll body.SOLUTION: A fixed scroll body 32 is composed of an end plate 32A and a support medium 32B which are separately manufactured. The end plate 32A is composed of: an inner end plate 32Aa; a spiral shaped lap 32Ab; and a cooling fin group 52 formed on a rear surface 33 of the inner end plate 32Aa. The support medium 32B includes a circular hole 32Ba where the inner end plate 32Aa is inserted into a center part, and casings 39 for housing pin crank mechanisms 40 are integrally formed with the support medium 32B. The end plate 32A and the support medium 32B are detachably coupled to each other in the casing 12b. The pin crank mechanisms 40 are housed in the casings 39 integrally formed at outer peripheral ends of the fixed scroll body 32 and the revolving scroll body 26.

Description

  The present invention relates to a fixed scroll body that is applied to a compressor, a vacuum pump, an expander, and the like and enables cost reduction and a scroll fluid machine including the fixed scroll body.

  In a scroll type fluid machine, a fixed scroll body meshes with a lap portion of an orbiting scroll body, a working medium is introduced, a scroll portion that forms a sealed chamber such as a compression chamber or an expansion chamber, and heat radiation that a cooling fin is formed. And a suction part that sucks the working medium. Since the scroll part is required to have high sealing performance, the nest reduction during casting and the compression process are performed to ensure sealing performance and suppress wear of the tip seal made of a solid lubricant attached to the tip of the lap part. Strength is required to suppress deformation during time and processing.

  In addition, good castability (formability) for enabling the formation of cooling fins with a narrow pitch and heat dissipation (thermal conductivity) for enabling efficient cooling are required. Furthermore, good workability for shortening the processing time while maintaining the processing accuracy, and surface treatment properties for ensuring the surface hardness and preventing wear and corrosion while maintaining the processing accuracy are required. In order to satisfy such a high required performance, a special Al alloy subjected to a special surface treatment such as a hard alumite treatment is used. Therefore, the cost is high.

In Patent Document 1, in order to avoid seizure and wear generated on the sliding surface of the lap portion of both scroll bodies made of Al alloy, the sliding surface of one lap portion is subjected to a hard anodizing treatment, It is disclosed that the sliding surface of the other lap portion is subjected to a plating process that is hard and rich in lubricity.
Further, in Patent Document 2, in order to reduce the pressure deformation of the end plate due to a pressure difference between the inside and outside of the compression chamber while ensuring light weight and machinability, An arrangement is disclosed in which an end plate sandwiches an iron-based sandwich member having rigidity higher than that of the Al material between the Al materials of the end plates.

Japanese Patent Laid-Open No. 02-125988 Japanese Patent Laid-Open No. 06-10858

  Since the means disclosed in Patent Document 1 performs a special surface treatment on the lap portion, it must be expensive. Moreover, since the means disclosed in Patent Document 2 needs to perform a process of sandwiching an iron-based sandwich member between end plates, there is a problem that the processing process becomes complicated and the cost is increased.

  On the other hand, since the sealed chamber is formed by the fixed scroll body and the orbiting scroll body, it is necessary to accurately position both scroll bodies. On the other hand, the fixed scroll body is fixed to the casing, and the orbiting scroll body is coupled to the fixed scroll body via a rotation prevention mechanism such as a pin crank mechanism. Therefore, it takes a lot of time to accurately position the scroll bodies. Moreover, when positioning between the lap | wrap parts of both scroll bodies, since the lap | wrap part of both scroll bodies cannot be visually recognized from the outer side, it takes much time to perform this positioning accurately.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and aims to reduce the cost of a fixed scroll body and enable easy and accurate positioning between the fixed scroll body and the orbiting scroll body when the scroll fluid machine is assembled. To do.

  In order to achieve the above object, the fixed scroll body of the present invention is a fixed scroll body that forms part of a scroll fluid machine and forms a plurality of sealed chambers that mesh with the orbiting scroll body and enclose a working medium. The end plate has a spiral wrap portion formed on the surface facing the orbiting scroll body, the other surface has a cooling fin, and a space in which the end plate is inserted in the center. And a support that supports the end plate inserted into the space. Thus, since the end plate and the support are manufactured separately, they can be detachably coupled when assembled to the casing.

  The support constituting the outer peripheral part of the fixed scroll body is not required to have a higher performance than the end plate in terms of performance other than strength, compared to the end plate constituting the inner peripheral part. By manufacturing the support and the end plate separately as in the present invention, the support can be manufactured with a low-cost material, and thus the cost of manufacturing the fixed scroll body can be reduced.

  Moreover, when attaching a fixed scroll body and a turning scroll body to a casing, a support body is first attached to a casing. Next, after attaching the orbiting scroll body to the support body, the end plate of the fixed scroll body can be attached. By performing the assembling work according to this procedure, the assembling work can be performed while viewing the lap portion of the orbiting scroll body. Therefore, the assembly work between the scroll bodies can be facilitated, and the positioning of the lap portions of the scroll bodies can be performed with high accuracy.

  In order to ensure the sealing performance of the sealed chamber, it is important to prevent a gap from being formed between the tip of the wrap portion and the end plate facing the wrap portion. According to the present invention, first, the relative position between the tip position of the wrap portion of the orbiting scroll body and the end plate of the fixed scroll body can be directly measured by assembling the orbiting scroll body to the support. Accordingly, accurate positioning between the tip of the wrap portion and the end plate can be easily performed.

  As one aspect of the present invention, the end plate is formed in a disc shape, and the end plate and the support can be arranged concentrically with each other. This facilitates the formation of the lap portion on the end plate, and facilitates the connection between the end plate and the support and the connection between the support and the orbiting scroll body.

  As one aspect of the present invention, the support body can be integrally formed with a casing that houses a mechanism for preventing the orbiting scroll body from rotating at a plurality of locations in the circumferential direction. This facilitates the attachment of the rotation prevention mechanism and facilitates the attachment of the orbiting scroll body to the support via the rotation prevention mechanism.

As one aspect of the present invention, the support portion of the support that supports the end plate forms an inlay structure with the outer peripheral end of the end plate including a flange provided on at least one of the end plate and the support. The end plate and the support can be coupled by a coupling tool (for example, a bolt) via a flange.
Accordingly, the end plate and the support body can be easily attached and detached, and the fixed scroll body can be made compact without increasing the axial dimension of the fixed scroll body.

As another aspect of the present invention, the end plate can be made of an Al alloy, and the support can be made of a member having higher rigidity than the Al alloy. As a result, the end plate can sufficiently satisfy the above-mentioned required performance, and the support body can satisfy the strength required for the outer portion by using a member made of a material higher in rigidity than the Al alloy.
For example, the support can be made of FC material (grey cast iron). As a result, the outer portion can be manufactured at low cost.

The scroll fluid machine of the present invention is a scroll fluid machine including the fixed scroll body having the above-described configuration. For example, in the case of a scroll compressor or scroll vacuum pump, the working medium is compressed in a plurality of sealed chambers composed of a fixed scroll body and a turning scroll body, and in the case of a scroll expander, the plurality of sealed chambers The working medium is expanded.
According to the scroll type fluid machine of the present invention, by providing the fixed scroll body having the above-described configuration, the cost of the fixed scroll body can be reduced, and when the scroll type fluid machine is assembled, the fixed scroll body and the orbiting scroll body are arranged between each other. Easy and accurate positioning is possible.

  As one aspect of the scroll type fluid machine of the present invention, a rotation prevention mechanism that is provided between the fixed scroll body and the orbiting scroll body and prevents the rotation of the orbiting scroll body can be provided. The anti-rotation mechanism is housed in a casing formed on a support body and a casing formed on an end plate of the orbiting scroll body facing the support body, and a pair of shafts whose axes are eccentric from each other. , And the pair of shafts can be rotatably supported on the casings of the fixed scroll body and the orbiting scroll body via bearings, respectively.

  As a result, the rotation prevention mechanism can be housed in the casing formed on the support body and the orbiting scroll body, so that the rotation prevention mechanism can be made compact and fixed in the step of coupling the orbiting scroll body to the support body via the rotation prevention mechanism. Positioning between the scroll body and the orbiting scroll body is facilitated.

  According to the present invention, since the fixed scroll body is divided into the end plate and the support body, the cost of the fixed scroll body can be reduced, and positioning between the fixed scroll body and the orbiting scroll body can be performed easily and accurately. it can.

1 is an overall perspective view of a scroll compressor according to an embodiment of the present invention. It is a longitudinal cross-sectional view of the scroll compressor. It is a perspective view of the fixed scroll body which comprises the said scroll compressor. It is a perspective view which decomposes | disassembles and shows the said fixed scroll body. It is a perspective view of the scroll body of the scroll compressor.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

  An embodiment in which the present invention is applied to a scroll compressor will be described with reference to FIGS. FIG. 1 is an overall perspective view of a scroll compressor 10 according to the present embodiment. In FIG. 1, the casing of the scroll compressor 10 includes a cylindrical casing 12 a that covers the drive shaft side, and a cylindrical casing 12 b that covers the orbiting scroll body and the fixed scroll body and resembles an ellipse. Yes. A circular opening 14 for attaching an electric motor (not shown) for rotating the drive shaft 18 is formed at one end surface of the casing 12a in the axial direction.

  A hollow cylindrical inlet duct 16 that forms an inlet opening for taking in cooling air is integrally provided at the center of the casing 12b at the center of one axial end surface of the casing 12b. On the outer peripheral surface of the casing 12a, an outlet duct 20 having a square cross section that forms an outlet opening for discharging cooling air is provided integrally with the casing 12a. In addition, five inlet ducts (only 22a, 22b and 22c are shown) having a quadrangular cross section are formed on the outer peripheral surface of the casing 12b. The inlet ducts are distributed in the circumferential direction and form inlet openings for taking in cooling air.

In FIG. 2, an eccentric shaft 24 having an axis at an eccentric position parallel to the axis of the drive shaft 18 is integrally formed on the tip surface of the drive shaft 18. Therefore, when the drive shaft 18 rotates, the eccentric shaft 24 turns (revolves).
The orbiting scroll body 26 includes a circular end plate 26a and a spiral wrap portion 26b formed integrally with the end plate 26a. A cylindrical bearing 28 is fitted at the center of the back surface 27 of the orbiting scroll body 26, and the eccentric shaft 24 is rotatably supported by the bearing 28 via a roller bearing 30. As a result, the orbiting scroll body 26 also orbits together with the eccentric shaft 24.

Next, the configuration of the fixed scroll body 32 will be described with reference to FIGS. 3 and 4. The fixed scroll body 32 is composed of an end plate 32A and a support body 32B which are manufactured separately.
The end plate 32A includes a circular plate-like inner end plate 32Aa and a spiral wrap portion 32Ab formed integrally on one surface of the inner end plate 32Aa. As shown in FIG. 4, a first cooling fin group 52 is formed on the back surface 33 of the inner end plate 32Aa. The first cooling fin group 52 includes a large number of linear cooling fins 52a extending radially from the periphery of the discharge port 36 (see FIG. 2) provided at the center of the inner end plate 32Aa toward the outer peripheral end. It consists of

  A rectangular parallelepiped-shaped flange 34 protrudes from the back surface 33 of the inner end plate 32Aa toward the radially outer side at six locations dispersed in the circumferential direction of the inner end plate 32Aa. The flange 34 is provided with a bolt hole 34a. The end plate 32A is made of, for example, an Al alloy such as AC4A or AC4C. Thus, an inlay structure in which the support 32B is fitted is formed by the outer peripheral end surface of the inner end plate 32Aa and one surface of the flange 34 protruding from the outer peripheral end surface.

  The support body 32B has a circular plate shape having a circular hole 32Ba loosely fitted to the outer peripheral end of the inner end plate 32Aa at the center. The end plate 32A and the support 32B are arranged concentrically. The support 32B is made of an FC material. The support body 32B is integrally provided with a casing 39 for accommodating a pin crank mechanism 40, which will be described later, at three locations at equal intervals in the circumferential direction. The casing 39 is also provided at a position facing the casing 39 provided on the support body 32 </ b> B at the outer peripheral end of the orbiting scroll body 26. In addition, a plurality of female screw holes 35 are provided at positions in the circumferential direction of the support body 32B corresponding to the bolt holes 34a.

  The support 32B is fixed to the casing 12b inside the casing 12b. The end plate 32A is attached to the support 32B by inserting a bolt 37 into the bolt hole 34a and screwing into the female screw hole 35 in a state where the end plate 32A is inserted into the circular hole 32Ba of the support 32B. The outer peripheral end face of the end plate 32A and the circular hole 32Ba of the support body 32B absorb the difference in thermal expansion caused by the difference in the material constituting them, and between the wrap portion 32Ab and the wrap portion 26b of the orbiting scroll body 26. Have a minute gap necessary for alignment.

  In FIG. 2, the fixed scroll body 32 forms the orbiting scroll body 26 and a plurality of compression chambers c. By the orbiting motion of the orbiting scroll body 26, air is sucked from an inlet (not shown), compressed in a plurality of compression chambers c, and then discharged from an outlet 36 formed at the center of the fixed scroll body 32. The compressed air discharged from the discharge port 36 is supplied to the customer from a discharge pipe 38 connected to the discharge port 36. The central portion of the back surface 33 of the fixed scroll body 32 is disposed so as to face the opening of the inlet duct 16.

  On the outer peripheral ends of the orbiting scroll body 26 and the fixed scroll body 32, pin crank mechanisms 40 are provided as rotation prevention mechanisms at 120 ° intervals at three locations in the circumferential direction. The pink rank mechanism 40 is housed in a casing 39 provided in the fixed scroll body 32 and the orbiting scroll body 26. The pink rank mechanism 40 has a crank member 42 composed of a pair of pin shafts 44a and 44b that are parallel to each other and are eccentric from each other. One pin shaft 44a is rotatably supported by a casing 39 integrally formed with the end plate 26a via a roller bearing 46, and the other pin shaft 44b is integrally formed with the support 32B via a roller bearing 48. The casing 39 is rotatably supported. The rotation of the orbiting scroll body 26 is prevented by the pin crank mechanism 40 having such a configuration.

A centrifugal fan 50 is attached to the drive shaft 18. The centrifugal fan 50 includes a circular end plate 50a attached to the drive shaft 18 and a plurality of blades 50b attached in the circumferential direction of the end plate 50a. The centrifugal fan 50 rotates with the drive shaft 18 to send out the cooling air flowing along the drive shaft 18 outward in the radial direction.
A second cooling fin group 54 is formed on the back surface 27 of the end plate 26a. The second cooling fin group 54 is composed of a large number of linear cooling fins 54 a extending radially from the periphery of the bearing 28 around the bearing 28.

  In the scroll compressor 10, a first cooling air passage for mainly cooling the fixed scroll body 32 and a second cooling air passage for mainly cooling the orbiting scroll body 26 are formed. As the centrifugal fan 50 rotates, cooling air is introduced into these cooling air passages. A duct 56 is provided at a distance from the back surface 27 of the orbiting scroll body 26 and the tip portion of the drive shaft 18. The duct 56 has a shape that covers the rear surface 27 and the tip portion of the drive shaft 18. The inner space of the duct 56 forms a second cooling air passage communicating with the inlet ducts 22a to 22e.

  In addition, a duct 58 is provided outside the duct 56 so as to surround the duct 56 with a space from the duct 56. At the outer peripheral ends of the fixed scroll body 32 and the orbiting scroll body 26, a first cooling air passage communicating with the inlet duct 16 is formed between the inlet ducts 22a to 22e. The inner space of the duct 58 forms a cooling air passage communicating with the inlet duct 16. Further, the duct 56 and the duct 58 are disposed concentrically with respect to the drive shaft 18.

  First, the configuration of the first cooling air passage will be described. As the centrifugal fan 50 rotates, the cooling air a <b> 1 is sucked from the inlet duct 16. The cooling air a <b> 1 contacts the center portion of the back surface 33 of the fixed scroll body 32, flows between the cooling fins 52 a from the center portion toward the outer peripheral end, and cools the fixed scroll body 32. The cooling air a1 that has reached the outer peripheral end of the fixed scroll body 32 flows into the passage formed between the duct 56 and the duct 58 from the passage formed between the inlet ducts 22a to 22e, and here the orbiting scroll body 26 and the drive shaft 18 are cooled. Thereafter, the cooling air a <b> 1 reaches the centrifugal fan 50, is sent to the outside of the centrifugal fan 50 in the radial direction by the centrifugal fan 50, and is discharged from the outlet duct 20.

  Next, the configuration of the second cooling air passage will be described. As the centrifugal fan 50 rotates, the cooling air a2 is sucked into the casing 12b from the inlet ducts 22a to 22e. The cooling air a2 flows through the second cooling air passage formed inside the duct 56, and at this time, flows between the cooling fins 54a, thereby cooling the orbiting scroll body 26. Further, the direction is changed to flow around the drive shaft 18, and after cooling the drive shaft 18, the centrifugal fan 50 is reached. Then, it is sent to the outside in the radial direction of the centrifugal fan 50 by the centrifugal fan 50 and discharged from the outlet duct 20.

FIG. 5 shows a state in which the support body 32B of the fixed scroll body 32 and the orbiting scroll body 26 are coupled before the end plate 32A is attached.
In this embodiment, when the fixed scroll body 32 and the orbiting scroll body 26 are attached to the casing 12b, first, only the support body 32B of the fixed scroll body 32 is attached to the casing 12b, and the orbiting scroll body 26 is attached via the pin crank mechanism 40. To attach to the support 32B. Next, by measuring the height t of the support 32B with reference to the end plate 26a of the orbiting scroll body 26, the assembly position is adjusted so as to eliminate the gap between the end plates of both scroll bodies and the tip of the lap portion. To do. Finally, the end plate 32A is attached to the support 32B using the bolts 37.

According to the present embodiment, the fixed scroll body 32 is divided into the end plate 32A and the support body 32B, and the support body 32B is manufactured from an FC material that is a high-rigidity and low-cost material. The manufacturing cost of the fixed scroll body 32 can be reduced while maintaining a sufficient strength.
Further, when the fixed scroll body 32 and the orbiting scroll body 26 are attached to the casing 12b, first, only the support body 32B is assembled with the orbiting scroll body 26, so that the inside of the scroll body can be assembled while being visually observed. Accurate positioning between the rotary scroll body 26 and the orbiting scroll body 26 can be easily performed.

Further, the end plate 32A is formed in a disc shape, and the end plate 32A and the support 32B are arranged concentrically with each other, so that it is easy to form the wrap portion 32Ab on the end plate 32A and the end plate 32A The connection between the plate 32A and the support 32B and the connection between the support 32B and the orbiting scroll body 26 are facilitated.
Further, since the support body 32B and the end plate 26a are integrally formed with the casing 39, the pin crank mechanism 40 is facilitated and the orbiting scroll body 26 is attached to the support body 32B via the pin crank mechanism 40. Will also be easier.

Further, since the fitting portion between the end plate 32A and the support body 32B of the fixed scroll body 32 has an inlay structure, the end plate 32A and the support body 32B can be easily attached and detached, and the axial direction of the fixed scroll body 32 The size does not increase as compared with the case where the divided structure is not used, and the structure of the fixed scroll body 32 can be kept compact.
Further, since the rotation prevention mechanism is the pin crank mechanism 40, the rotation prevention mechanism can be housed in the casing 39 formed integrally with the support body 32B, thereby facilitating the positioning of the fixed scroll body 32 and the orbiting scroll body 26. .

Further, in the first cooling air passage, the center portion of the fixed scroll body 32 that becomes particularly hot can be cooled by the low-temperature cooling air a1 that has just flowed in from the inlet duct 16, so that the cooling effect can be improved. Further, the cooling air a <b> 1 flowing through the first cooling air passage can improve the cooling effect of the fixed scroll body 32 by flowing between the cooling fins 52 a.
In the second cooling air passage, the cooling air a2 sucked from the inlet ducts 22a to 22e flows between the cooling fins 54a, so that the cooling effect of the orbiting scroll body 26 can be improved. Further, since the cooling air a1 and a2 flowing through the ducts 56 and 58 are directed to gather at the central portion, the flow rate of the cooling air at the central portion can be increased, and the cooling effect of the central portion can be improved.

Further, since the cooling air passage is divided into the first cooling air passage and the second cooling air passage, and the cooling fins 52a and the cooling fins 54a are arranged in the flow direction of the cooling air, the pressure loss of the cooling air is reduced. Can be reduced. Therefore, the power consumption of the scroll compressor 10 can be reduced.
Moreover, since the inlet ducts 22a to 22e are distributed in the circumferential direction of the casing 12b and the first cooling air passages are distributed between the inlet ducts 22a to 22e, an increase in the size of the casing 12b can be avoided. Furthermore, since the ducts 56 and 58 are concentrically arranged with respect to the drive shaft 18, the casing 12a can be made compact, and thereby the casing 12a can be made smaller.

Further, by providing the pin crank mechanism 40 as the rotation prevention mechanism, the rotation prevention mechanism can be simplified and reduced in cost, thereby preventing an increase in the size of the casing.
Further, by providing the centrifugal fan 50 capable of increasing the static pressure as the cooling fan, the air volume of the cooling air a1 and a2 can be increased, and the cooling effect can be improved also by this.
The same cooling effect can be obtained by using other types of centrifugal fans, for example, sirocco fans.

  According to the present invention, the cost of the fixed scroll body can be reduced, and the positioning between the fixed scroll body and the orbiting scroll body can be easily and accurately performed.

DESCRIPTION OF SYMBOLS 10 Scroll type compressor 12a, 12b Casing 14 Opening part 16, 22a-22e Inlet duct 18 Drive shaft 20 Outlet duct 24 Eccentric shaft 26 Orbiting scroll body 26a End plate 26b Lap part 27 Back surface 28 Bearing 30, 46, 48 Roller bearing 32 Fixed scroll body 32A End plate 32Aa Inner end plate 32Ab Lap portion 32B Support body 32Ba Circular hole 33 Back surface 34 Flange 34a Bolt hole 35 Female thread hole 36 Discharge port 37 Bolt 38 Discharge pipe 39 Casing 40 Pink rank mechanism 42 Crank member 44a, 44b Pin Shaft 50 Centrifugal fan 50a End plate 50b Blade 52 First cooling fin group 52a Cooling fin 54 Second cooling fin group 54a Cooling fins 56, 58 Duct a1, a2 Cooling air c Compression chamber

Claims (8)

A fixed scroll body that forms part of a scroll fluid machine and forms a plurality of sealed chambers that mesh with the orbiting scroll body and enclose a working medium,
An end plate in which a spiral wrap portion is formed on the surface facing the orbiting scroll body and a cooling fin is formed on the other surface;
It has a space for inserting the end plate in the center, is arranged so as to surround the end plate, and includes a support body that supports the end plate inserted into the space. Fixed scroll body.   The fixed scroll body according to claim 1, wherein the end plate is formed in a disc shape, and the end plate and the support are arranged concentrically with each other.   The fixed scroll body according to claim 1 or 2, wherein a casing for housing a mechanism for preventing rotation of the orbiting scroll body is integrally formed at a plurality of locations in the circumferential direction of the support body.   The support portion of the support that supports the end plate forms an inlay structure with an outer peripheral end of the end plate including a flange provided on at least one of the end plate or the support, The fixed scroll body according to claim 1 or 2, wherein the end plate and the support body are coupled by a coupling tool through the flange.   The fixed scroll body according to claim 1 or 2, wherein the end plate is made of an Al alloy, and the support is made of a member having rigidity higher than that of the Al alloy.   6. The fixed scroll body according to claim 5, wherein the member having higher rigidity than the Al alloy is made of FC material.   A scroll type fluid machine comprising the fixed scroll body according to any one of claims 1 to 6. A rotation prevention mechanism provided between the fixed scroll body and the orbiting scroll body and preventing rotation of the orbiting scroll body;
The rotation prevention mechanism is housed in a casing formed on the support body and a casing formed on an end plate of the orbiting scroll body facing the support body, and a pair of shafts whose axes are eccentric from each other. Having a crank member formed integrally;
The scroll fluid machine according to claim 7, wherein the pair of shafts are rotatably supported by casings of the fixed scroll body and the orbiting scroll body via bearings, respectively.

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