WO2015125261A1

WO2015125261A1 - Scroll fluid machine

Info

Publication number: WO2015125261A1
Application number: PCT/JP2014/054101
Authority: WO
Inventors: 小林　義雄; 原島　寿和; 公宣岩野; 末藤　和孝; 翔渡邉
Original assignee: 株式会社日立産機システム
Priority date: 2014-02-21
Filing date: 2014-02-21
Publication date: 2015-08-27
Also published as: EP3109475A1; EP3109475A4; KR20160070135A; JP6205478B2; EP3109475B1; KR101886668B1; JPWO2015125261A1; CN105849411B; CN105849411A

Abstract

The purpose of the present invention is to increase the reliability of a rotation prevention mechanism and extend the life thereof by preventing the direct transfer of heat from an orbiting scroll to the rotation prevention mechanism. The present invention is provided with: a stationary scroll; an orbiting scroll provided facing the stationary scroll and performing an orbiting motion; a casing provided on the outside of the orbiting scroll; a drive shaft for driving the orbiting scroll; a back face plate fastened to the orbiting scroll and connected at the boss section of the back face plate to the drive shaft; and a rotation prevention mechanism provided between the casing and a boss plate and preventing the rotation of the orbiting scroll. The present invention is characterized in that the back face plate has: a rotation prevention mechanism-side back face plate provided integrally with the rotation prevention mechanism; and a drive shaft-side back face plate provided integrally with the boss section, the rotation prevention mechanism-side back face plate being not in contact with the orbiting scroll.

Description

Scroll type fluid machine

The present invention relates to a scroll type fluid machine.

In Patent Document 1, “at least the back surface of the auxiliary crank boss part and the central part of the rotating shaft boss part corresponding part are in contact with the cooling fin top part on the orbiting scroll side and integrated with the orbiting scroll. A cooling structure in a scroll fluid machine is disclosed.

Japanese Patent No. 4130285

In the scroll fluid machine disclosed in Patent Document 1, the fin tip on the back of the orbiting scroll and the boss back of the auxiliary crank bearing housing member are in contact with each other, and the temperature of the scroll lap is transferred from the contact portion to There has been a problem that the temperature rises and the life of the bearings and grease decreases.

In view of the above problems, an object of the present invention is to provide a scroll fluid machine that realizes improved reliability and longer life of an anti-rotation mechanism by preventing direct heat transfer from the orbiting scroll to the anti-rotation mechanism. And

In order to solve the above problems, the present invention drives a fixed scroll, a orbiting scroll provided to face the fixed scroll and orbiting, a casing provided outside the orbiting scroll, and the orbiting scroll. A rotation shaft that is provided between the casing and the back plate, and that prevents rotation of the orbiting scroll. The back plate includes a rotation prevention mechanism side back plate provided integrally with the rotation prevention mechanism, and a drive shaft side back plate provided integrally with the boss portion, and the rotation prevention mechanism side A scroll fluid machine is provided in which a back plate is not in contact with the orbiting scroll.

According to the present invention, it is possible to provide a scroll fluid machine that realizes an improvement in the reliability of the rotation prevention mechanism and a longer life.

It is sectional drawing of the scroll type fluid machine which concerns on the Example of this invention. It is a perspective view of the turning scroll which concerns on the Example of this invention. It is a perspective view of the back plate concerning the example of the present invention. It is a perspective view of a turning scroll and a back plate concerning the example of the present invention.

Hereinafter, a scroll type air compressor as an example of a scroll type fluid machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Embodiments of the present invention will be described with reference to FIGS.

FIG. 1 shows a cross-sectional view of a scroll compressor in the present embodiment. The casing 1 of the scroll type air compressor is formed in a cylindrical shape, is provided outside the orbiting scroll 8, and supports the drive shaft 15 in a rotatable manner.

As shown in FIG. 1, the fixed scroll 2 provided on the opening side of the casing 1 has an end plate 3 formed in a substantially disc shape with an axis OO as a center, and a shaft on a tooth bottom surface serving as a surface of the end plate 3. A spiral wrap portion 4 erected in the direction, a cylindrical outer peripheral wall portion 5 that surrounds the wrap portion 4 and is provided on the outer diameter side of the end plate 3, and a plurality of projections that protrude from the rear surface of the end plate 3 The cooling fins 6 are generally configured.

Here, the wrap portion 4 has a spiral shape, for example, three turns before and after three turns from the inner diameter side to the outer diameter side when the outermost diameter end is the winding start end and the outermost diameter end is the winding end end, for example. It is wound. The tooth tip surface of the wrap portion 4 is separated from the tooth bottom surface of the end plate 9 of the orbiting scroll 8 as a counterpart by a certain axial dimension.

Further, a seal groove 4A is provided on the tooth tip surface of the wrap portion 4 along the winding direction of the wrap portion 4, and the seal groove 4A serves as a seal member that is in sliding contact with the end plate 9 of the orbiting scroll 8. A tip seal 7 is provided. Further, the outer peripheral wall portion 5 is formed in a substantially circular shape and opens at the end face of the fixed scroll 2. And the outer peripheral wall part 5 is arrange | positioned in the radial direction outer side of the lap | wrap part 10 in order to avoid interference with the lap | wrap part 10 of the turning scroll 8. FIG.

The orbiting scroll 8 provided in the casing 1 so as to be orbitable is erected on a substantially disc-shaped end plate 9 disposed to face the end plate 3 of the fixed scroll 2 and a tooth bottom surface that becomes the surface of the end plate 9. The spiral wrap portion 10 and a plurality of cooling fins 11 projecting from the back surface of the end plate 9 are generally configured. A rear plate 12 connected to the drive shaft 15 is provided on the front end side of the cooling fin 11.

Here, the wrap portion 10 has, for example, a spiral shape of about 3 turns, similar to the wrap portion 4 of the fixed scroll 2. The tooth tip surface of the wrap portion 10 is separated from the tooth bottom surface of the end plate 3 of the fixed scroll 2 which is the counterpart by a certain axial dimension. Further, a seal groove 10A is provided on the tooth tip surface of the wrap part 10 along the winding direction of the wrap part 10, and the seal groove 10A serves as a seal member that is in sliding contact with the end plate 3 of the fixed scroll 2. A tip seal 13 is provided.

Also, a cylindrical boss portion 14 connected to the crank portion 15A of the drive shaft 15 via the swivel bearing 14a and the bearing housing 14b is integrally formed on the center side of the back plate 12. At this time, a pulley 15B is provided on one end side of the drive shaft 15 outside the casing 1, and this pulley 15B is, for example, a belt (not shown) on the output side of an electric motor as a drive source. And so on. As a result, the drive shaft 15 is rotationally driven by an electric motor or the like to cause the orbiting scroll 8 to orbit with respect to the fixed scroll 2.

Further, a cooling fan 16 is attached to the pulley 15B using bolts or the like, and the cooling fan 16 generates cooling air in the fan casing 17. As a result, the cooling fan 16 blows cooling air along the ducts in the fan casing 17 to the inside of the casing 1 and the back side of the

scrolls

2, 8 to cool the casing 1, the fixed scroll 2, the orbiting scroll 8, etc. To do.

Furthermore, between the back plate 12 and the casing 1, there are provided, for example, three auxiliary cranks 18 (only one is shown) as an anti-rotation mechanism for preventing the orbiting scroll 8 from rotating. The auxiliary crank 18 is disposed via auxiliary crank bearings in auxiliary crank boss portions 18b formed on the casing 1 and the back plate 12, respectively.

A plurality of compression chambers 19 provided between the fixed scroll 2 and the orbiting scroll 8 are located between the wrap portions 4 and 10 and are sequentially formed from the radially outer side to the radially inner side. It is kept airtight. The compression chambers 19 are continuously reduced between the wrap portions 4 and 10 while moving from the radially outer side toward the radially inner side when the orbiting scroll 8 orbits in the forward direction. The

Thereby, outside air is sucked into the compression chamber 19A located on the radially outer side of each compression chamber 19 from the suction port 20 described later, and this air reaches the compression chamber 19B located on the radially inner side. Compressed air becomes compressed air. The compressed air is discharged from the discharge port 22 and stored in an external storage tank (not shown).

The suction port 20 provided on the outer diameter side of the fixed scroll 2 opens from the outer diameter side of the end plate 3 to the outer peripheral wall portion 5 and communicates with a compression chamber 19A located on the radially outer side. Further, the suction port 20 is located outside the end plate 3 of the fixed scroll 2 in the radial direction of the wrap portion 10 of the orbiting scroll 8 and opens in a range (non-sliding region) where the tip seal 13 does not slide. . And the suction inlet 20 sucks air in the compression chamber 19A located in the radial direction outer side through the suction filter 21, for example.

Note that the suction port 20 may be configured to suck in pressurized air. In this case, it is good also as a structure which removes the suction filter 21 and connects the suction inlet 20 to piping to which pressurized air is supplied.

A discharge port 22 provided on the radially inner side (center side) of the end plate 3 of the fixed scroll 2 communicates with a compression chamber 19B located on the radially inner side, and discharges compressed air in the compression chamber 19B to the outside. It is.

The flange 24 located radially outside the lap portion 4 of the fixed scroll 2 fixes the fixed scroll 2 to the casing 1 with the flange 1a of the casing 1. The alignment between the fixed scroll 2 and the casing 1 is performed by inserting a positioning member through the alignment hole 37.

The face seal groove 25 provided on the end face of the fixed scroll 2 facing the end plate 9 of the orbiting scroll 8 is located on the outer side in the radial direction of the outer peripheral wall 5 and is formed in an annular shape surrounding the outer peripheral wall 5. . An annular face seal 26 is attached in the face seal groove 25. The face seal 26 hermetically seals between the end face of the fixed scroll 2 and the end plate 9 of the orbiting scroll 8, and prevents air sucked into the outer peripheral wall portion 5 from leaking therebetween.

The scroll type air compressor according to this embodiment has the above-described configuration. Next, the operation of the scroll type air compressor will be described.

First, when the drive shaft 15 is rotationally driven by a drive source (not shown) such as an electric motor, the orbiting scroll 8 is centered on the axis OO of the drive shaft 15 while being prevented from rotating by the rotation prevention mechanism. By performing the orbiting motion, the compression chamber 19 defined between the lap portion 4 of the fixed scroll 2 and the lap portion 10 of the orbiting scroll 8 is continuously reduced. Thereby, the air sucked from the suction port 20 of the fixed scroll 2 can be discharged toward the external tank (not shown) as compressed air from the discharge port 22 of the fixed scroll 2 while being sequentially compressed in each compression chamber 19. it can.

The cooling structure of the scroll type air compressor according to this embodiment will be described. Cooling air generated by the cooling fan 16 circulates inside the casing 1 and the back side of the

scrolls

2 and 8 along a duct and the like in the fan casing 17 to cool the casing 1, the fixed scroll 2, the orbiting scroll 8, and the like. To do.

Detailed configurations of the orbiting scroll 8 and the back plate 12 in this embodiment will be described with reference to FIGS.

FIG. 2 shows the back of the orbiting scroll 8 in this embodiment. The orbiting scroll 8 has cooling fins 11 formed on the back side of the end plate 9. A plurality of fastening portions 38 that are fastened to the back plate 12 are provided on the back of the orbiting scroll 8. Here, the cooling fin 11 and the fastening portion 38 may be integrally formed. By doing in this way, since the flow of the cooling air between the cooling fins 11 is not hindered by the fastening portion 38, the orbiting scroll 8 and the back plate 11 are not reduced without reducing the cooling efficiency of the orbiting scroll 8 and the back plate 12. Can be concluded.

Note that not only the orbiting scroll 8 but also the back plate 12 may be provided with cooling fins. Thereby, the temperature rise of the back plate can be further suppressed.

FIG. 3 shows the back plate 12 that is fastened to the orbiting scroll 8. The back plate 12 is provided with a drive shaft side back plate 12 a formed integrally with the boss portion 14 connected to the drive shaft 15 and an auxiliary crank bearing housing 18 b that houses a plurality of auxiliary cranks 18. It is comprised by the mechanism side back surface plate 12b. A hollow portion 39 is provided between the drive shaft side back plate 12a and the rotation prevention mechanism side back plate 12b, and the drive shaft side back plate 12a and the rotation prevention mechanism side back plate 12b are not connected in the radial direction.

Among the back plates 12, the rotation prevention mechanism side back plate 12b is connected to the drive shaft side back plate 12a in the circumferential direction via a connecting portion 13. When the end plate 9 and the back plate 12 of the orbiting scroll 8 are deformed due to thermal expansion by the compression operation, the hollow portion 39 can absorb the thermal deformation. Therefore, the thermal expansion of the drive shaft side back plate 12a is not transmitted to the rotation prevention mechanism side back plate 12b, and distortion of the auxiliary crank bearing housing 18b can be suppressed.

Here, the drive shaft side back plate 12a may be formed of a material having lower rigidity than the rotation prevention mechanism side back plate 12b. As a result, the back plate 12 can absorb more deformation due to thermal expansion by the drive shaft side back plate 12a, and the distortion of the auxiliary crank bearing housing 18b is further effectively suppressed, and the reliability and life of the auxiliary crank 18 are further improved. Can be made.

FIG. 4 shows the orbiting scroll 8 with the back plate 12 fastened. In the present embodiment, the cooling fin 11 formed on the back side of the orbiting scroll 8 is not in contact with the rotation prevention mechanism side back plate 12b in a state where the orbiting scroll 8 and the back plate 12 are fastened by the fastening portion 38. It is configured. On the other hand, at the position facing the drive shaft side back plate 12a, the dimension of the cooling fin 11 in the axial direction (longitudinal direction of the drive shaft 15) is formed larger than the position facing the rotation prevention mechanism side back plate 12b, and cooling is performed. The fin 11 is configured to contact the drive shaft side rear plate 12a.

As a result, direct heat transfer from the orbiting scroll 8 to the rotation prevention mechanism side back plate 12b can be reduced, and the temperature rise of each auxiliary crank bearing and the grease in the auxiliary crank bearing can be effectively suppressed. Life expectancy can be realized.

On the other hand, since the cooling fin 11 is configured to come into contact with the drive shaft side rear plate 12a, the heat of the orbiting scroll 8 can be effectively released. Even if comprised in this way, since the drive shaft side back plate 12a and the rotation prevention mechanism side back plate 12b are not connected in the radial direction, heat transfer to the rotation prevention mechanism side back plate 12b does not increase. In addition, in the connection part 13, the heat transfer to the autorotation prevention mechanism side back plate 12b can further be suppressed by making it non-contact with the cooling fin 11. FIG.

Further, since the cooling air flowing into the space formed between the orbiting scroll 8 and the back plate 12 flows in the hollow portion 39 between the drive shaft side back plate 12a and the rotation prevention mechanism side back plate 12b, While effectively releasing the heat of the orbiting scroll 8, it is possible to suppress the temperature rise of the rotation prevention mechanism side rear plate 12b and the auxiliary crank 18.

As described above, according to the present embodiment, it is possible to prevent the rotation of the orbiting scroll 8 while effectively releasing the heat of the rotation preventing mechanism side rear plate 12b and the auxiliary crank 18. Further, the temperature of the auxiliary crank 18 can be reduced without adding parts, the cost can be reduced, and the number of machining parts can be reduced, so that the number of machining steps (machining time) can be reduced.

In the present embodiment, the case where the present invention is applied to a scroll type air compressor as a scroll type fluid machine has been described as an example. However, the present invention is not limited to this, and the present invention is not limited to this. You may apply to a scroll type fluid machine. Moreover, you may apply to systems, such as a tank integrated package compressor provided with the scroll-type fluid machine, and a nitrogen gas generator.

The embodiments described so far are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention is not limitedly interpreted by these embodiments. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

DESCRIPTION OF SYMBOLS 1 Casing 1a Flange 2

Fixed scroll

3,9 End plate 4,10 Lapping part 5 Outer peripheral wall part 6,11

Cooling fin

7,13 Tip seal 8 Orbiting scroll 12 Back plate 12a Drive shaft side rear plate 12b Anti-rotation mechanism side rear plate 13 Connection part 14 Boss part 14a Slewing bearing 14b Bearing housing 15 Drive shaft 16 Cooling fan 17 Fan casing 18 Auxiliary crank 18a Auxiliary crank bearing 18b Auxiliary crank boss part 19 Compression chamber 20 Suction port 21 Suction filter 22 Discharge port 24 Flange 25 Face seal groove 26 Face seal 37 Positioning hole 38 Fastening part 39 Hollow part

Claims

With fixed scrolling,
An orbiting scroll provided to face the fixed scroll and orbiting;
A casing provided outside the orbiting scroll;
A drive shaft for driving the orbiting scroll;
A back plate fastened to the orbiting scroll at a fastening portion and connected to the drive shaft at a boss portion;
A rotation prevention mechanism provided between the casing and the back plate and preventing rotation of the orbiting scroll;
The back plate has an anti-rotation mechanism side back plate provided integrally with the anti-rotation mechanism and a drive shaft side back plate provided integrally with the boss part,
The scroll fluid machine according to claim 1, wherein the rotation prevention mechanism side back plate is not in contact with the orbiting scroll.
The scroll fluid machine according to claim 1, wherein the drive shaft side rear plate is in contact with a cooling fin formed on the orbiting scroll.
The scroll fluid machine according to claim 1, wherein the drive shaft side rear plate is formed of a material having lower rigidity than the rotation prevention mechanism side rear plate.
3. The scroll fluid machine according to claim 2, wherein a fastening portion for fastening the orbiting scroll and the back plate is provided, and the fastening portion and the cooling fin are integrally formed.
The scroll fluid machine according to claim 1, further comprising a hollow portion between the drive shaft side back plate and the rotation prevention mechanism side back plate.
The scroll fluid machine according to claim 1, wherein cooling fins are provided on the back plate.
With fixed scrolling,
An orbiting scroll provided to face the fixed scroll and orbiting;
A casing provided outside the orbiting scroll;
A drive shaft for driving the orbiting scroll;
A back plate fastened to the orbiting scroll and connected to the drive shaft;
A rotation prevention mechanism provided between the casing and the back plate and preventing rotation of the orbiting scroll;
The back plate has a rotation prevention mechanism side back plate provided integrally with the rotation prevention mechanism and a drive shaft side back plate connected to the drive shaft,
A scroll type fluid machine, wherein a cooling air passage is provided between the rotation prevention mechanism side rear plate and a cooling fin formed on the orbiting scroll.
The scroll fluid machine according to claim 7, wherein the drive shaft side rear plate is in contact with a cooling fin formed on the orbiting scroll.
The scroll fluid machine according to claim 7, wherein the drive shaft side rear plate is formed of a material having lower rigidity than the rotation prevention mechanism side rear plate.
The scroll fluid machine according to claim 8, wherein a fastening portion for fastening the orbiting scroll and the back plate is provided, and the fastening portion and the cooling fin are integrally formed.
The scroll fluid machine according to claim 7, further comprising a hollow portion between the drive shaft side back plate and the rotation prevention mechanism side back plate.
The scroll fluid machine according to claim 7, wherein a cooling fin is provided on the back plate.