JP3562539B2 - Scroll type fluid machine - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a scroll-type fluid machine suitable for use in an air compressor, a vacuum pump, and the like.
[0002]
[Prior art]
A conventional oil-free scroll type fluid machine includes a casing, a fixed scroll fixed to the casing, and a spiral wrap portion provided on a head plate, and a base end side rotatably supported by the casing, A rotary shaft having a crank shaft, a spiral wrap portion overlapping the wrap portion of the fixed scroll on the front surface side of the end plate, and a boss portion provided on the back surface side; A slewing bearing provided on the boss portion for rotatably supporting the crank of the drive shaft.
[0003]
When this type of scroll fluid machine is used as an air compressor, in order to cool the orbiting scroll and the fixed scroll that have been stagnated by the compression heat generated during the compression operation, the fixed scroll and the orbiting scroll are provided with a mirror back surface. A fin for heat dissipation is set up, and a fan and a duct are used to forcibly blow air to this part.
[0004]
[Problems to be solved by the invention]
In the above scroll type fluid machine, it is conceivable to cool the scroll more than before in order to increase the compression efficiency. However, providing a larger fan for this purpose increases the weight and also requires only turning the large fan. Electric energy is also required.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, a scroll-type fluid machine according to the present invention includes a casing, a fixed scroll fixed to the casing, and a spiral wrap portion provided upright on a head plate, and a base end side provided with the casing. A drive shaft that is rotatably supported and has a crank at the tip end, an orbiting scroll in which a spiral wrap that overlaps with the wrap of the fixed scroll is provided upright on the front side of the end plate; In order to rotatably support the crank of the scroll type fluid machine comprising a swivel bearing provided on the back side of the end plate, a fin provided upright on the back surface of the end plate of the orbiting scroll, and the orbiting scroll of the casing A stationary member having a side surface facing the side surface of the fin is provided on the facing surface, and is formed when the orbiting scroll makes a orbiting motion. A trajectory drawn by the serial end plate at least a portion of said stationary member in the orthogonal projection and the range of shapes that can be allowed to position, and characterized in that a said stationary member and the fins alternately.
[0006]
[Action]
In the scroll-type fluid machine of the present invention, when the orbiting scroll orbits, the distance between the side surface of the fin and the side surface of the stationary member changes, so that air is sucked and exhausted between the fin and the stationary member and convection is generated. Wake up and the fins are cooled by this convection.
[0007]
【Example】
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a sectional view showing the overall structure of a scroll type air compressor A according to a first embodiment, and FIG. 2 is a sectional view of the fin 2 and the stationary member 4 taken along the line aa in FIG.
[0008]
Reference numeral 6 denotes a casing that forms an outer frame of the scroll-type air compressor A. The casing 6 is formed into a cylindrical shape by a cylindrical side surface 6A and a rear plate, and has a casing body 6B having a front opening and a scroll portion. And a partition 6C separating the motor unit. The partition 6C is provided at a position slightly retreated from the front surface of the casing, and a fin 2 and a stationary member 4 described below are provided between the front surface of the casing 6 and the partition 6C. Are provided with vent holes 24, 24 described later.
[0009]
Reference numeral 10 denotes a drive shaft rotatably supported by a bearing portion 8 of the casing via a bearing. The distal end of the drive shaft 10 extends toward the scroll side of the casing 6 to become a crank 10A. The axis is eccentric with respect to the axis of the drive shaft 10 by a predetermined dimension. The drive shaft 10 protrudes from one end of the bearing portion 8 to the motor portion, and a rotor (not shown) of the motor portion is provided on the protruding end side.
[0010]
Reference numeral 12 denotes a fixed scroll fixed to the front surface of the casing 6 via a bolt or the like (not shown). The fixed scroll 12 projects from a circular plate-shaped end plate 12A and an outer edge of the end plate 12A. A mounting flange 12B abutted on the front surface, a spiral wrap portion 12C erected on the surface of the end plate 12A, the center of the end plate 12A serving as a winding start end, and the outer peripheral side serving as an end end of winding; A large number of fins 12D are provided in parallel on the back surface of 12A.
[0011]
A suction port 16 communicating with a compression chamber 14 to be described later is opened on the upper side of the flange 12B of the fixed scroll 12 in the drawing, and a discharge port 18 is formed in the center of the end plate 12A of the fixed scroll. One side opening of the discharge port 18 opens to the compression chamber 14, and the other end opening communicates with an air tank (not shown).
[0012]
Reference numeral 20 denotes an orbiting scroll disposed in the casing main body 6B of the casing 6 so as to face the fixed scroll 12, and the orbiting scroll 20 has a disk-shaped end plate 20A and a vertical plate on the surface of the end plate 20A. The end plate 20A is substantially constituted by a spiral wrap portion 20B whose center side is a winding start end and whose outer peripheral side is a winding end end. The wrap portion 20B of the orbiting scroll main body 20 is disposed so as to overlap the wrap portion 12C of the fixed scroll 12 by a predetermined angle, and overlaps with the wrap portion 12C of the fixed scroll 12 and the wrap portion of the orbiting scroll body 20. A plurality of compression chambers 14 are formed between the compression chambers 14 and 20B. The orbiting scroll 20 is rotatably attached to a crank 10A of the drive shaft 10 via an orbiting bearing 22. A plurality of auxiliary cranks (not shown) are provided on the outer peripheral side of the back surface of the end plate 20A to prevent the orbiting scroll 20 from rotating.
[0013]
When the drive shaft 10 is rotated by the electric motor and the orbiting scroll main body (orbiting scroll 20) makes orbital movement, the suction port of the fixed scroll 12 is placed in the outermost compression chamber 14 which is the lowest pressure side among the compression chambers 14. External air is sucked in through 16, and while this air is sequentially compressed in each compression chamber 14, it is sequentially sent to the high-pressure compression chamber 14 located at the center side of each compression chamber 14, and becomes high pressure. The air is discharged from the compression chamber 14 on the highest pressure side to an external air tank or the like (not shown) through the discharge port 18 of the fixed scroll 12.
[0014]
Further, as shown in FIG. 2, a plurality of fins 2A, 2B,... (To be collectively referred to as fins 2) are erected in parallel on the back surface of the end plate 20A of the orbiting scroll 20, and the casing is opposed to the fins. A plurality of stationary members 4A, 4B,... (To be referred to as stationary members 4 as a whole) on the front surface of the partition wall 6C of the casing 6, that is, the surface of the casing 6 facing the orbiting scroll 20, orthogonally project the locus drawn by the end plate 20A onto the partition wall 6C. The stationary member 4 is provided so that a part of the stationary member 4 may fall within the figure 26 thus formed. Since the plurality of stationary members 4 are located between the fins 2, the fins 2 and the stationary members 4 are alternately arranged in the radial direction of the end plate 20A. The stationary member 4 has the same shape as the fin, but is called a stationary member because it is fixed to the partition 6C.
[0015]
When the orbiting scroll 20 is performing the orbiting motion, the fin 2 repeatedly approaches and separates from the stationary member 4, and when the side surface of the fin 2 is farthest from the side surface of the stationary member 4, the eccentric amount of the crank 10A By having a distance greater than twice as large as the distance between the fin 2 and the stationary member 4, there is no contact.
[0016]
The side surface 4a of the stationary member 4A is parallel to the side surface 2b of the fin 2A, and the side surface 4a of the stationary member 4A is provided so as to overlap the side surface 2b of the fin 2A when viewed from above in FIG. I have. The end surface 2c (see FIG. 1) of the fin 2 faces the bottom end of the stationary member 4, that is, the surface of the partition wall 6C with a small gap, and the tip 4c of the stationary member 4 faces the end plate 20A with a small gap. I have. Further, ventilation holes 24, 24 for supplying outside air around the fin 2 and the stationary member 4 are provided in the casing side surface 6A.
[0017]
Next, how the convection occurs between the fin 2 and the stationary member 4 in the cooling operation of the scroll-type air compressor A will be described with reference to FIG. FIG. 3 is an enlarged view of a part of the cross section of the fin 2 and the stationary member 4 on the aa plane of the air compressor A.
[0018]
When the orbiting scroll 20 is orbiting, the positional relationship between the fins 2A and 2B and the stationary member 4A is as shown by (1) → (2) → (3) → (4) → (1) in the figure. And repeats this. The dashed arrows in the figure indicate the airflow, and the arc-shaped arrows indicate the direction in which the fins move.
[0019]
(1) is a state in which the fin 2A and the stationary member 4A are separated from each other, and the surface 2a of the fin 2B on the stationary member 4A side approaches the surface 4b of the stationary member 4A on the fin 2B side, and the fin 2A is stationary. The surface 2b on the member 4A side and the surface 4a on the fin 2A side of the stationary member 4A are in the middle of being separated. At this stage, since the space between the surface 2a and the surface 4b becomes narrower, an airflow flowing out from between the surface 2a and the surface 4b is generated, and the space between the surface 2b and the surface 4a is expanded. , An airflow flowing from between the surface 2b and the surface 4a is generated.
[0020]
(2) is where the surface 2a and the surface 4b are closest and oppose each other with a small gap. At this time, the smaller the minute gap, the larger the air exchange rate of the space between the fin 2 and the stationary member 4 can be. Therefore, it is desirable that the minute gap is 10% or less of the eccentricity of the crank 10A. More preferably, it is 5% or less. In this state, the opposite surface 4a of the stationary member 4A and the surface 2b of the fin 2A are located farthest apart. After this state, the fin 2 moves in the direction of the arrow, so that the distance between the surface 2a and the surface 4b increases and the distance between the surface 2b and the surface 4a decreases. Since the end surface of the fin 2 and the end surface of the stationary member 4 respectively face the bottom surface of the stationary member 4 and the end plate 20A with a small gap, the change in the distance between the side surface of the fin 2 and the side surface of the stationary member 4 is: The volume of the space corresponding to the change is changed, and an airflow flowing between the surfaces 2a and 4b and an airflow flowing out between the surfaces 2b and 4a are generated.
[0021]
(3) indicates that the distance between the surface 2a and the surface 4b is increasing, and the distance between the surface 2b and the surface 4a is in the process of decreasing. Therefore, an airflow flowing between the surface 2a and the surface 4b and an airflow flowing out between the surface 2b and the surface 4a are generated.
[0022]
(4) is where the surface 2b and the surface 4a are closest to each other and oppose each other with a small gap. The surface 2a and the surface 4b are located farthest apart in this state. After this state, the fin 2 moves in the direction of the arrow, so that the distance between the surface 2b and the surface 4a increases, and the distance between the surface 2a and the surface 4b decreases. Therefore, conversely, an airflow that flows in between the surface 2b and the surface 4a is generated, and an airflow that flows out between the surface 2a and the surface 4b is generated.
[0023]
This operation, that is, the approach and separation between the fins 2 and the stationary member 4 are sequentially repeated between all the fins 2 and the stationary member 4 to perform the intake and exhaust of air. An inflow airflow and an outflow airflow are constantly generated, and the convection promotes heat radiation of the fins 2. Further, the atmosphere between the fins 2 and the stationary member 4 is agitated by an air current, and a small amount of fresh air is supplied from the ventilation holes 24. When the orbiting scroll 12 is orbiting, the orbiting scroll 12 always generates heat, and at the same time, the fin 2 and the stationary member 4 can provide a cooling action.
[0024]
In addition, the fin 2B approaches and separates from the stationary member 4A to suck and discharge air, and at the same time, repeatedly approaches and separates to and from the stationary member 4B. Therefore, airflow is generated on both side surfaces of the fin 2B, and the fin 2B is cooled from both side surfaces, and the cooling effect is greater than when there is no stationary member 4B. The same effect can be said for all the fins 2.
[0025]
Further, the fin 2 and the stationary member 4 are provided in parallel, so that the distance between the fin 2 and the stationary member 4 can be reduced to such a degree that the fin 2 and the stationary member 4 do not contact each other. When this occurs, the warmed air between the fins 2 and the stationary member 4 is almost pushed out, and thereafter, when the distance between the fins 2 and the stationary member 4 increases, the surrounding air is sucked in. The replacement rate of air in the space between the stationary member 2 and the stationary member 4 is increased, and the cooling effect can be increased.
[0026]
In the present embodiment, the points on the side surfaces of the fins 2 have the same distance to the opposing side surfaces of the stationary member 4, but have a smaller distance to the stationary member 4 than the other portions. There may be parts. For example, the fin 2 is provided to be inclined with respect to the stationary member 4 as shown in FIG. 4, there is a protruding portion on the side surface of the fin 2 as shown in FIG. 5, or the side surface of the fin 2 as shown in FIG. In the case of a curved shape, a portion having a smaller distance from the stationary member 4 pushes air, and an airflow is generated in a direction in which the orbiting scroll turns, thereby promoting heat radiation of the fins 2. be able to.
[0027]
Next, an air compressor B according to a second embodiment of the present invention will be described with reference to FIG. FIG. 7 shows a cross section of the fins 32 and the stationary member 34 of the air compressor B on a plane corresponding to the a-a plane of the air compressor A of the first embodiment. Since the configuration is the same as that of the first embodiment except for the fin 32 and the stationary member 34, the description is omitted, and only the fin 32 and the stationary member 34 will be described.
[0028]
As shown in the figure, a plurality of fins 32A, 32B,... (Generally referred to as fins 32) are radially provided on the mirror plate back surface 20A of the orbiting scroll 20, and also shown in the figure on the front surface of the partition wall 6C of the casing 6. As described above, a plurality of sector-shaped stationary members 34A, 34B,... Is provided. Since the plurality of stationary members 34 are located between the fins 32, the fins 32 and the stationary members 34 are alternately arranged in the circumferential direction of the end plate 20A. The angle between the adjacent fins 32 and the fan-shaped angle of the stationary member 34 are the same. The end surface of the fin 32 faces the bottom surface of the stationary member 34 with a minute gap, and the tip of the stationary member 34 faces the end plate 20A with a minute gap. As shown in the figure, adjacent fins 32 are connected at a center portion of the end plate 20A by an arc wall 36 protruding toward the center of the end plate 20A, and all the fins 32 are connected similarly. There is a hole in the center for communicating the crankpin.
[0029]
When the orbiting scroll 20 is orbiting, the fins 32 repeatedly approach and separate from the stationary member 34, and when the side surface of the fin 32 is farthest from the side surface of the stationary member 34, the eccentric amount of the crank 10A By having a distance greater than twice the fin 32 and the stationary member 34, there is no contact.
[0030]
Although the stationary member 34 is a fan-shaped solid body, a hollow body or a simple V-shaped wall may be used as long as there is a V-shaped wall facing the fin 32.
[0031]
Next, with respect to the cooling action of the scroll type air compressor B, how convection occurs between the fin 32 and the stationary member 34 will be described with reference to FIG. FIG. 8 is an enlarged view of a part of the cross section of the fin 32 and the stationary member 34 of the air compressor B on a plane corresponding to the a-a plane of the air compressor A of the first embodiment.
[0032]
When the orbiting scroll 20 is orbiting, the positional relationship between the fins 32 and the stationary member 34 changes as shown by (1) → (2) → (3) → (4) → (1) in the figure. This has been repeated. The dashed arrows in the figure indicate the airflow, and the arc-shaped arrows indicate the direction in which the fins move.
[0033]
(1) is a state in which the V-shaped apex formed by the two adjacent fins 32A and 32B and the arc wall 36B and the fan-shaped apex 34c of the stationary member 34A are the most separated, and the fin 32B is closer to the stationary member 34A. The side surface 32b of the stationary member 34A on the fin 32B side is approaching, and the side surface 32a of the fin 32A on the stationary member 34A side and the side surface 34a of the stationary member 34A on the fin 32A side are in the middle of being separated. At this stage, since the space between the surface 32b and the surface 34b becomes narrower, an airflow flowing out from between the surface 32b and the surface 34b is generated, and the space between the surface 32a and the surface 34b is expanded. Therefore, an airflow flowing from between the surface 32a and the surface 34b is generated.
[0034]
(2) is where the surface 32b and the surface 34b are closest and oppose each other with a small gap. At this time, the smaller the small gap, the larger the air exchange rate of the space between the fin 32 and the stationary member 34 can be. Therefore, the small gap is desirably 10% or less of the eccentricity of the crank 10A. More preferably, it is 5% or less. In this state, the opposite surface 34a of the stationary member 34A and the surface 32a of the fin 32A are farthest apart. After this state, since the fins 32 move in the direction of the arrow, the distance between the surfaces 32b and 34b increases, and the distance between the surfaces 32a and 32a decreases. Since the end surface of the fin 32 and the end surface of the stationary member 34 respectively face the bottom surface of the stationary member 34 and the end plate 20A with a small gap, the change in the distance between the side surface of the fin 32 and the side surface of the stationary member 34 is as follows. A corresponding change in the volume of the space results in an airflow flowing between the surfaces 32b and 34b and an airflow flowing out between the surfaces 32a and 32a.
[0035]
(3) is where the fan-shaped vertex 34c of the stationary member 34A has just approached the center of the arc wall 36 connecting the fins 32A and 32B, and the distance between the fan-shaped vertex 34c and the arc wall 36 has become the smallest. Since the space between the surface 32b and the surface 34b is in the middle of expansion, and the space between the surface 32a and the surface 34a is in the process of contraction, the inflow airflow and the outflow airflow continue as before.
[0036]
(4) is where the surface 32a and the surface 34a are closest and oppose each other with a small gap. The surface 32b and the surface 34b are located farthest apart in this state. After this state, the fin 32 moves in the direction of the arrow, so that the distance between the surfaces 32a and 34a increases, and the distance between the surfaces 32b and 34b decreases. Accordingly, contrary to the above, an airflow that flows in between the surface 32a and the surface 34a is generated, and an airflow that flows out between the surface 32b and the surface 34b is generated.
[0037]
This operation, that is, the approach and separation between the fins 32 and the stationary members 34 are sequentially repeated between all the fins 32 and the stationary members 34, and the air is sucked and exhausted. As a result, between the fins 32 and the stationary members 34, An inflow airflow and an outflow airflow are constantly generated, and the convection promotes heat dissipation of the fins 32. Further, the atmosphere between the fins 32 and the stationary member 34 is agitated by the airflow, and a little fresh air is supplied from the ventilation holes 24, so that the warmed air due to the heat radiation of the fins 32 does not stagnate. When the orbiting scroll 12 is orbiting, the orbiting scroll 12 always generates heat, and at the same time, the fin 2 and the stationary member 4 can provide a cooling action.
[0038]
The fins 32B approach and separate from the stationary member 34A to suck and discharge the air, and at the same time, repeat the approach and separation to the stationary member 34B, and the air is sucked and exhausted here as well. Therefore, airflow is generated on both side surfaces of the fin 32B, and the fin 32B is cooled from both side surfaces, and the cooling effect is greater than when there is no stationary member 34B. The same effect can be obtained for all the fins 32.
[0039]
Further, in the present embodiment, the airflow generated between the fin 32 and the stationary member 34 flows in a substantially constant direction along the surface 32b, the arc wall 36B, and the surface 32a. Can promote heat radiation.
[0040]
In the present embodiment, the side surface of the fin 32 and the side surface of the stationary member 34 are both V-shaped similar shapes. However, the fin 32 and the stationary member 34 formed in a U-shaped similar shape may be used. Good.
[0041]
Next, an air compressor C according to a third embodiment of the present invention will be described with reference to FIG. FIG. 9 is an enlarged view of a part of the cross section of the fins 32 and 42 and the stationary member 44 of the air compressor C on the plane corresponding to the plane a-a of the air compressor A of the first embodiment. Since the configuration other than the fin 42 and the stationary member 44 is the same as that of the first embodiment, the description is omitted, and only the fin 42 and the stationary member 44 will be described.
[0042]
On the back surface of the orbiting scroll 20, a plurality of fins 32 similar to the fins 32 provided in the air compressor B of the second embodiment are radially provided on the entire back surface of the end plate 20A of the orbiting scroll 20. Further, a smaller V-shaped fin 42 is provided inside each V-shaped formed by two adjacent fins 32. On the entire surface of the partition wall 6C of the casing 6, a V-shaped stationary member 44 as shown in the figure is provided so that a part of the stationary member 44 covers the figure 26 in which the trajectory drawn by the end plate 20A is orthogonally projected on the partition wall 6C. ing. The end surfaces of the fins 32 and 42 face the bottom surface of the stationary member 44 with a small gap, and the tip of the stationary member 44 faces the end plate 20A with a small gap.
[0043]
A smaller V-shaped fin 42A is provided inside the V-shaped formed by the two adjacent fins 32A and 32B and the arc wall 36B. The V-shaped angle of the fin 42A is the same as the angle between two adjacent fins 32A and 32B. A V-shaped stationary member 44A as shown in the figure is provided on the partition wall 6C so as to be sandwiched between the fins 32A, 32B and the fin 42A when the fins 32, 42B are overlapped with the end plate 20A. The stationary member 44 and the stationary member 44 are arranged so that the fins and the stationary member are alternately arranged in the circumferential direction of the end plate 20A.
[0044]
When the orbiting scroll 20 is orbiting, the fins 42 are repeatedly approaching and separating from the stationary member 44. When the side surface of the fin 42 is farthest from the side surface of the stationary member 44, the eccentric amount of the crank 10A By having a distance larger than twice the fin 42 and the stationary member 44, there is no contact.
[0045]
Next, how the convection occurs between the fins 32 and 42 and the stationary member 44 in the cooling action of the scroll air compressor C will be described with reference to FIG. FIG. 9 is an enlarged view of a part of the cross section of the fins 32 and 42 and the stationary member 44 of the air compressor C on the plane corresponding to the plane a-a of the air compressor A of the first embodiment.
[0046]
When the orbiting scroll 20 is orbiting, the positional relationship between the fins 32A, 32B and 42A and the stationary member 44A is as shown by (1) → (2) → (3) → (4) → (1) in the figure. And repeats this. The dashed arrows in the figure indicate the airflow, and the arc-shaped arrows indicate the direction in which the fins move.
[0047]
At this time, the air flow generated between the fins 32A, 32B and the stationary member 44A and the cooling action thereof are the same as the cooling action of the air compressor B of the second embodiment, and therefore the description is omitted here, and the fin 42A and the stationary The airflow generated between the member 44A and the cooling action thereof will be described.
[0048]
(1) is a state in which the V-shaped vertex 42c of the fin 42A and the V-shaped inner vertex 44c of the stationary member 44A are closest to each other. From this, one of the outer side surfaces 42a of the fin 42A and the stationary member 42a The surface 44a on the surface 42a side of the inner side surface of the fin 42A approaches, and the surface 42b of the outer side surface of the fin 42A that is not the surface 42a, and the surface 44b on the inner side surface of the stationary member 44A on the surface 42b side. Is on the way away. At this stage, since the space between the surface 42a and the surface 44a becomes narrower, an airflow flowing out from between the surface 42a and the surface 44a is generated, and the space between the surface 42b and the surface 44b is expanded. Therefore, an airflow flowing from between the surface 42b and the surface 44b is generated.
[0049]
(2) is where the surface 42a and the surface 44a come closest to each other and face each other with a minute gap. At this time, the smaller the small gap, the larger the air replacement ratio of the space between the fin 42 and the stationary member 44 can be. Therefore, the small gap is desirably 10% or less of the eccentricity of the crank 10A. More preferably, it is 5% or less. In this state, the opposite surface 44b of the stationary member 44A and the surface 42b of the fin 42A are farthest apart. After this state, the fin 42 moves in the direction of the arrow, so that the distance between the surface 42a and the surface 44a increases and the distance between the surface 42b and the surface 44b decreases. Accordingly, contrary to the above, an airflow that flows in between the surface 42a and the surface 44a is generated, and an airflow that flows out between the surface 42b and the surface 44b is generated.
[0050]
(3) is a state in which the vertex of the V-shaped vertex 42c of the fin 42A and the vertex 44c inside the V-shape of the stationary member 44a are closest. Since the space between the surface 42a and the surface 44a is in the middle of expansion, and the space between the surface 42b and the surface 44b is in the process of contraction, the inflowing airflow and the outflowing airflow continue as before.
[0051]
(4) is where the surface 42b and the surface 44b are closest and oppose each other with a small gap. The surface 42a and the surface 44a are located farthest apart in this state. After this state, the fin 42 moves in the direction of the arrow, so that the distance between the surface 42b and the surface 44b increases and the distance between the surface 42a and the surface 44b decreases. Therefore, conversely, an airflow that flows in between the surface 42b and the surface 44b is generated, and an airflow that flows out between the surface 42a and the surface 44a is generated.
[0052]
This operation, that is, the approach and separation between the fins 32 and the stationary member 34 is sequentially repeated between all the fins 42 and the stationary member 44, and the air is sucked and exhausted. An inflow airflow and an outflow airflow are constantly generated, and the convection promotes heat radiation of the fins 42. Further, the atmosphere between the fins 32 and 42 and the stationary member 44 is agitated by the airflow, and a little fresh air is supplied from the ventilation holes 24, so that the warmed air due to the heat radiation of the fins 32 and 42 does not stagnate. When the orbiting scroll 12 is orbiting, the orbiting scroll 12 always generates heat, and at the same time, the fin 2 and the stationary member 4 can provide a cooling action.
[0053]
Further, in the present embodiment, the airflow generated between the fins 32 and the stationary member 44 is in the same direction as that of the second embodiment, and the airflow generated between the fins 32 and the fins 44 is the surface 44b, the vertex 44c. Since it flows in a substantially constant direction along the surface 44a, the heat radiation of the fins 32 and 42 can be further promoted as compared with the first embodiment.
[0054]
Further, in addition to the effects of the second embodiment, an airflow is also generated between the fins 42 and the stationary member 44, so that the cooling effect is higher than that of the second embodiment.
[0055]
【The invention's effect】
As described above, the scroll-type fluid machine of the present invention is characterized in that the fins are erected on the back surface of the end plate of the orbiting scroll, the stationary member having the side surface facing the side surface of the fin is provided on the casing, and the path drawn by the end plate of the orbiting scroll Is positioned within the range of the figure formed by orthogonally projecting the fins and the stationary members, and the fins and the stationary members are arranged so as to be alternately positioned. Are close to each other, and an air flow is generated around each fin to cool the individual fins, thereby increasing the cooling effect of the orbiting scroll and increasing the compression efficiency. Further, the fins are cooled on at least two or more side surfaces, and the cooling effect is increased.
[0056]
Further, in the scroll type fluid machine according to the second aspect, when the orbiting scroll is performing the orbiting motion, the distance when the side surface of the fin is most separated from the side surface of the stationary member is more than twice the eccentric amount of the drive shaft. When the fins are closest to each other, the side of the fin faces the side of the stationary member with a small gap, so that the air exchange rate of the space between the fin and the stationary member can be increased, and the cooling effect can be improved. Can increase.
[Brief description of the drawings]
FIG. 1 is a sectional view showing the overall structure of a scroll type air compressor A according to a first embodiment of the present invention.
FIG. 2 is a sectional view of a fin and a stationary member of the scroll air compressor A according to the first embodiment of the present invention.
FIG. 3 is an enlarged view of a part of a cross section of a fin and a stationary member of the scroll air compressor A according to the first embodiment of the present invention.
FIG. 4 is an enlarged view of a part of a cross section of a fin and a stationary member of a modified example of the scroll air compressor A of the first embodiment of the present invention.
FIG. 5 is an enlarged view of a part of a cross section of a fin and a stationary member of a modified example of the scroll air compressor A of the first embodiment of the present invention.
FIG. 6 is an enlarged view of a part of a cross section of a fin and a stationary member of a modified example of the scroll air compressor A of the first embodiment of the present invention.
FIG. 7 is a sectional view of a fin and a stationary member of a scroll air compressor B according to a second embodiment of the present invention.
FIG. 8 is an enlarged view of a part of a cross section of a fin and a stationary member of a scroll air compressor B according to a second embodiment of the present invention.
FIG. 9 is an enlarged view of a part of a cross section of a fin and a stationary member of a scroll air compressor C according to a third embodiment of the present invention.
[Explanation of symbols]
A. Scroll air compressor according to a first embodiment of the present invention
B. Scroll type air compressor according to a second embodiment of the present invention
C. Scroll air compressor according to a third embodiment of the present invention
2 fins
2A fin
2B fin
2a Side view of fin 2B
2b Side view of fin 2A
2c End face of fin 2A
4 Stationary members
4A Stationary member
4B Stationary member
4a Side view of stationary member 4A
4b Side of stationary member 4A
4c Tip of stationary member 4A
6 Casing
6A Side of casing
6B Casing body
6C partition
8 Bearing
10 Drive shaft
10A crank
12 Fixed scroll
12A head plate
12B flange
12C Wrap part
12D fin
14 Compression chamber
16 Suction port
18 Discharge port
20 orbiting scroll
20A head plate
20B Wrap part
22 Slewing bearing
24 vents
26 Trace drawn by end plate 20A
32 fins
32A fin
32B fin
32a Side surface of the fin 32A
32b Side surface of the fin 32B
34 Stationary member
34A Stationary member
34B Stationary member
34a Side view of stationary member 34A
34b Side view of stationary member 34A
34c The top of the stationary member 34A
36 arc wall
36B arc wall
36a Side of arc wall
42 Fins
42A fin
42a Side surface of the fin 42A
42c Top of fin 42A
44 Stationary member
44A Stationary member
44a Side view of the stationary member 44A
44b Side surface of the stationary member 44A
44c Inside vertex of stationary member 44A

Claims (2)

A casing, a fixed scroll fixed to the casing, and a spiral wrap portion provided upright on the end plate; a drive shaft rotatably supported on the base end by the casing and a crank on the distal end side; and a surface of the end plate A orbiting scroll having a spiral wrap portion overlapping the wrap portion of the fixed scroll on the side thereof; and a orbit provided on the back side of the end plate for rotatably supporting the orbiting scroll on a crank of the drive shaft. In a scroll type fluid machine including a bearing,
Fins erected on the back surface of the end plate of the orbiting scroll,
A stationary member having a side surface facing the side surface of the fin is provided on a surface of the casing facing the orbiting scroll,
Positioning at least a part of the stationary member within a range of a graphic formed by orthogonally projecting the trajectory drawn by the end plate formed when the orbiting scroll performs the orbiting motion, and alternately changing the fins and the stationary member A scroll-type fluid machine characterized by being arranged. When the side surface of the fin is farthest away from the side surface of the stationary member when the orbiting scroll is performing the orbiting motion, the distance is greater than twice the amount of eccentricity of the drive shaft, The scroll fluid machine according to claim 1, wherein a side surface of the scroll type fluid machine faces a side surface of the stationary member with a small gap.

Images