JP5193703B2 - Scroll type fluid machine - Google Patents

Description

  The present invention relates to a scroll type fluid machine.

The scroll type fluid machine has a casing, a drive shaft provided at one end in the casing and the other end extending outside the casing, a fixed scroll provided on the extension of the drive shaft in the casing, and the fixed scroll. Some have a orbiting scroll provided on one end side of the drive shaft and a fan provided on the drive shaft in the casing. In such a scroll type fluid machine, there is a type in which the cooling air by the fan is divided into a flow toward the fixed scroll, a flow toward the orbiting scroll, and a flow toward the orbiting bearing by providing a guide plate ( For example, see Patent Document 1).
Japanese Patent Laid-Open No. 8-100777

  By the way, for example, a plurality of devices having different specifications may be obtained by combining drive motors having different performances for the same type of scroll fluid machine. In other words, by combining a relatively low rotation type inexpensive drive motor with a scroll type fluid machine, it becomes an inexpensive device even with a relatively low output, or a high rotation type type with respect to the same type of scroll type fluid machine. By combining the drive motor, it becomes a high output device. In such a case, if the cooling air is made to flow in the high output type as well as the low output type, the thermal balance of the orbiting scroll and the fixed scroll is lost, and the difference in deformation due to thermal expansion is There was a possibility of increasing the size and affecting each part.

  Therefore, the present invention can suppress the expansion of the difference in deformation amount due to the thermal expansion of the orbiting scroll and the fixed scroll regardless of whether it is used as a low rotation / low output type or a high rotation / high output type. An object of the present invention is to provide a fluid machine.

  In order to achieve the above object, the present invention provides a guide member in the casing for dividing the cooling air generated by the fan into a flow toward the fixed scroll and a flow toward the orbiting scroll, and the axial direction of the drive shaft or the drive The mounting position of the guide member can be adjusted in at least one of the radial directions with respect to the shaft.

  According to the present invention, it is possible to suppress an increase in the difference in deformation amount due to thermal expansion of the orbiting scroll and the fixed scroll, regardless of whether the low rotation / low output type or the high rotation / high output type is used.

“First Embodiment”
An air compressor which is a first embodiment of a scroll type fluid machine according to the present invention will be described below with reference to FIGS. 1 and 2.
The air compressor 11 of the first embodiment is a scroll compressor that compresses air sucked from a suction port (not shown) and discharges it from a discharge port 13. The air compressor 11 has a box shape and has an opening 14 at the center of one side. The formed casing 15, the base 16 fixed in the casing 15, and one end side is provided in the casing 15, and the other end side is rotatably supported by the base 16 so as to extend out of the casing 15 from the opening 14. The drive shaft 17, the fixed scroll 18 provided on the extension of the drive shaft 17 in the casing 15, the orbiting scroll 19 provided on one end side of the drive shaft 17 facing the fixed scroll 18, and the casing 15. And a fan 20 provided at an intermediate portion of the drive shaft 17.

  The fixed scroll 18 includes an end plate 23 having an outer diameter equivalent to that of the base 16, and a spiral wrap portion 24 erected on the surface of the end plate 23 on the side of the orbiting scroll 19. The orbiting scroll 19 includes an end plate 26 having an outer diameter equivalent to that of the fixed scroll 18, and a spiral wrap portion erected on the surface of the end plate 26 on the fixed scroll 18 side so as to overlap the wrap portion 24 of the fixed scroll 18. 27.

  The drive shaft 17 is rotatably supported by the base 16 on one side and rotatably supports the orbiting scroll 19, and the other side protrudes from the base 16 to the opening 14 side and the first shaft 30 and the opening 14. The first shaft 30 is divided into a second shaft 31 extending outside the casing 15, and the first shaft 30 and the second shaft 31 are connected by the fan 20 in a state of being coaxially disposed. The drive shaft 17 receives the drive force of a drive motor (not shown) at the portion of the second shaft 31 that extends outside the casing 15.

  The fixed scroll 18 is provided with the above-described unillustrated suction port so as to open to the outer peripheral side compression chamber 33, and the above-described discharge port 13 so as to open to the central side compression chamber 34.

  In the air compressor 11, when the drive shaft 17 is driven and rotated by a drive motor (not shown), the orbiting scroll 19 performs an orbiting motion, whereby the air sucked from the suction port is fixed to the fixed scroll 18. The compressed air is compressed in the compression chambers 33 and 34 formed between the orbiting scroll 19 and discharged from the discharge port 13.

  The fan 20 has a substantially cylindrical shape that is coaxial with the drive shaft 17, and rotates to discharge the inner air radially outward by the plurality of fins 36 arranged in a cylindrical shape. Thereby, the air outside the casing 15 flows into the fan 20 from the opening 14.

  In the first embodiment, a guide member 38 that divides the cooling air generated by the fan 20 into a flow toward the fixed scroll 18 and a flow toward the orbiting scroll 19 is provided on the outer peripheral side of the base 16. .

  The guide member 38 is positioned between the fixed scroll 18, the orbiting scroll 19, the fan 20, and the casing 15 in a posture along the axial direction of the drive shaft 17 (that is, the arrangement direction of the fixed scroll 18, the orbiting scroll 19, and the fan 20). Is arranged. The guide member 38 includes an intermediate plate portion 39 extending along the axial direction of the drive shaft 17 and a radial direction of the drive shaft 17 (of the drive shaft 17 from one end of the intermediate plate portion 39 on the fan 20 side in the axial direction). In the direction perpendicular to the axial direction, specifically in the direction connecting the drive shaft 17 and the guide member 38 (hereinafter the same)) and the one end curved plate portion 40 curved toward the fan 20 and the intermediate plate portion 39 in the axial direction. The other end curved plate portion 41 is curved from the other end on the fixed scroll 18 side toward the fixed scroll 18 in the radial direction of the drive shaft 17.

  As a result, a part of the cooling air discharged outward in the radial direction by the fan 20 is blown to the orbiting scroll 19 side through the inner flow path 44 formed on the fan 20 side of the guide member 38. Thus, the remaining part is blown to the fixed scroll 18 side through the outer flow path 45 between the guide member 38 and the casing 15. The outer flow path 45 is formed between the guide member 38 and the rear wall portion 47, the ceiling portion 48, and the front wall portion 49 of the casing 15. In order to make the outer flow path 45 into a smooth shape, a rear curved corner portion that curves along the one end curved plate portion 40 of the guide member 38 between the rear wall portion 47 and the ceiling portion 48 of the casing 15. 50 is formed, and between the ceiling portion 48 and the front wall portion 49, a front curved corner portion 51 that is curved along the other end curved plate portion 41 of the guide member 38 is formed.

  The guide member 38 can adjust its mounting position in at least one of the axial direction of the drive shaft 17 and the radial direction with respect to the drive shaft 17, and distributes the cooling air by the fan 20 to the fixed scroll 18 and the orbiting scroll 19. The flow rate can be changed. That is, a bottomed cylindrical mounting boss portion 54 that protrudes toward the base 16 side in the radial direction of the drive shaft 17 is formed on the other end curved plate portion 41 side of the intermediate plate portion 39 of the guide member 38. A bolt 56 is inserted into a mounting hole 55 formed in the bottom of the boss portion 54 and extending in the axial direction of the drive shaft 17, and the bolt 56 is further screwed into the base 16, whereby the guide member 38 is It is fixed to the base 16. Thus, the guide member 38 can change the position of the drive shaft 17 in the axial direction by relatively moving the bolt 56 within the range of the mounting hole 55 in a state where the bolt 56 is loosened. Further, a washer 60 is provided between the mounting boss portion 54 of the guide member 38 and the base 16 by inserting a bolt 56 inward. By changing the number of washers 60, the guide member 38 The position of the drive shaft 17 in the radial direction can be changed.

  As the guide member 38 is positioned closer to the fan 20 in the axial direction of the drive shaft 17, the outer flow path 45 becomes narrower, and the cooling air flow from the fan 20 increases the distribution flow rate to the orbiting scroll 19, while the fixed scroll 18. Distributing flow rate is reduced. On the contrary, the outer flow path 45 becomes wider as the guide member 38 is positioned on the fixed scroll 18 side in the axial direction of the drive shaft 17, and the cooling air from the fan 20 decreases the distribution flow rate to the orbiting scroll 19 while being fixed. The distribution flow rate to the scroll 18 increases.

  Further, as the number of washers 60 is increased, the outer flow path 45 becomes narrower as the guide member 38 is positioned on the outer side in the radial direction of the drive shaft 17, and the cooling air flow from the fan 20 has a larger distribution flow rate to the orbiting scroll 19. On the other hand, the distribution flow rate to the fixed scroll 18 is reduced. On the contrary, as shown in FIG. 2, the outer flow path 45 becomes wider as the guide member 38 is positioned inward in the radial direction of the drive shaft 17 by eliminating or reducing the washer 60, and the cooling air from the fan 20 is swirled. While the distribution flow rate to the scroll 19 decreases, the distribution flow rate to the fixed scroll 18 increases.

  According to the first embodiment described above, the guide member 38 that distributes the cooling air from the fan 20 to the flow to the fixed scroll 18 and the flow to the orbiting scroll 19 is provided for each of the fixed scroll 18 and the orbiting scroll 19. The distribution flow rate to the orbiting scroll 19 can be changed according to the upper limit value of the rotational speed of the drive shaft 17, for example, when used as a low rotation / low output type with a lower upper limit value. When used as a high rotation / high output type with a high upper limit, it is possible to increase the diversion flow rate to the orbiting scroll 19 where the heat generation amount increases, and the low rotation / low output type and high rotation / Even if it is used as any model of the high output type, it is possible to suppress an increase in the difference in deformation due to the thermal expansion of the orbiting scroll 19 and the fixed scroll 18. That is, by increasing or decreasing the amount of cooling air to the orbiting scroll 19 for each output, the difference in deformation due to thermal expansion between the orbiting scroll 19 and the casing 15 can be kept constant even at different outputs. The PCD difference (= correction value) between the casing 15 and the casing 15 can be a common value for all outputs, and parts can be shared. Further, since the cooling air can be optimized for each model, it is possible to prevent an auxiliary crank damage accident due to temperature. Further, the cooling efficiency can be improved by rectifying by the guide member 38, and the reliability is improved.

  In addition, the guide member 38 is disposed between the fixed scroll 18, the orbiting scroll 19 and the fan 20 and the casing 15 along the arrangement direction of the fixed scroll 18, and the position in the arrangement direction can be changed. The shunt flow rate can be adjusted with a simple structure.

  Furthermore, since the guide member 38 can be changed in position in the direction perpendicular to the arrangement direction of the fixed scroll 18, the orbiting scroll 19, and the fan 20, the diversion flow rate can be adjusted in detail with a simple structure.

“Second Embodiment”
Next, the air compressor of 2nd Embodiment of this invention is demonstrated based on FIG. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

  In the second embodiment, the position adjustment structure of the guide member 38 is different from the first embodiment.

  That is, the guide member 38 is formed not with the mounting boss portion 54 but with the mounting piece 65 extending from the edge portion toward the base 16, and the mounting piece 65 has a mounting hole 66 that is long in the radial direction of the drive shaft 17. Form. The guide member 38 is attached to the base 16 by inserting the bolt 67 through the attachment hole 66 and screwing it into the base 16. When the bolt 67 is loosened, the position of the guide member 38 can be changed in the radial direction of the drive shaft 17 within the range of the mounting hole 66.

  According to the second embodiment, the position of the guide member 38 can be changed in the radial direction of the drive shaft 17 with a simpler structure.

“Third Embodiment”
Next, the air compressor of 3rd Embodiment of this invention is demonstrated based on FIG. In addition, about the site | part which is common in 2nd Embodiment, it represents with the same name and the same code | symbol.

  In the third embodiment, the position adjustment direction of the guide member 38 is different from that of the second embodiment.

  That is, the attachment hole 70 that is long in the axial direction of the drive shaft 17 is formed in the attachment piece 65 that extends toward the base 16 at the edge of the guide member 38. The guide member 38 is attached to the base 16 by inserting the bolt 67 through the attachment hole 70 and screwing it into the base 16. When the bolt 67 is loosened, the position of the guide member 38 can be changed in the axial direction of the drive shaft 17 within the range of the mounting hole 70.

  According to the third embodiment, the position of the guide member 38 can be changed in the axial direction of the drive shaft 17 with a simpler structure.

“Fourth Embodiment”
Next, an air compressor according to a fourth embodiment of the present invention will be described with reference to FIG. In addition, about the site | part which is common in 2nd Embodiment, it represents with the same name and the same code | symbol.

  In the fourth embodiment, the position adjustment direction of the guide member 38 is different from that of the second embodiment.

  That is, the attachment piece 65 extending toward the base 16 side of the edge of the guide member 38 is inclined so as to be inclined away from the fan 20 in the radial direction of the drive shaft 17 toward the fan 20 side in the axial direction of the drive shaft 17. Hole 72 is formed. The guide member 38 is attached to the base 16 by inserting the bolt 67 into the attachment hole 72 and screwing it into the base 16. When the bolt 67 is loosened, the position of the guide member 38 can be simultaneously changed in the axial direction and the radial direction of the drive shaft 17 within the range of the mounting hole 72. That is, the guide member 38 narrows the outer flow path 45 in both the axial direction and the radial direction of the drive shaft 17 when moved to one side, and the guide member 38 moves in the axial direction of the drive shaft 17 when moved to the opposite side. The outer flow path 45 is expanded in both the radial direction and the radial direction.

  According to the fourth embodiment, the position of the guide member 38 can be changed in both the radial direction and the axial direction of the drive shaft 17 with a simpler structure.

  In the first to fourth embodiments, the mounting holes 55, 66, 70, 72 are not elongated holes, but are configured by a plurality of round holes arranged in the position adjustment direction, and appropriately selected round holes are used. By using it, the position of the guide member 38 may be adjusted.

The air compressor which is 1st Embodiment of the scroll type fluid machine which concerns on this invention is shown, (a) is a fragmentary sectional view, (b) is a fragmentary top view of a guide member. 1 is a partial cross-sectional view showing an air compressor that is a first embodiment of a scroll fluid machine according to the present invention. It is a fragmentary sectional view showing an air compressor which is a 2nd embodiment of a scroll type fluid machine concerning the present invention. It is a fragmentary sectional view showing an air compressor which is a 3rd embodiment of a scroll type fluid machine concerning the present invention. It is a fragmentary sectional view showing an air compressor which is a 4th embodiment of a scroll type fluid machine concerning the present invention.

Explanation of symbols

11 Air compressor (scroll fluid machine)
15 Casing 17 Drive shaft 18 Fixed scroll 19 Orbiting scroll 19
20 Fan 38 Guide member

Claims (1)

A casing,
A drive shaft having one end side provided in the casing and the other end side extending outside the casing;
A fixed scroll provided on an extension of the drive shaft in the casing;
An orbiting scroll provided on one end side of the drive shaft facing the fixed scroll;
In the scroll fluid machine having a fan provided on the drive shaft in the casing,
A guide member that divides cooling air generated by the fan into a flow toward the fixed scroll and a flow toward the orbiting scroll is provided between the fixed scroll, the orbiting scroll, the fan, and the casing, and the guide An inner flow path toward the orbiting scroll is formed inside the member, and an outer flow path toward the fixed scroll is formed between the guide member and the casing, and the axial direction of the drive shaft or the drive shaft A scroll type fluid machine characterized in that the mounting position of the guide member can be adjusted in at least one of the radial directions with respect to.

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