Compressor

Abstract

To provide a compressor which can inhibit ice buildup near an outlet of a PCV passage.SOLUTION: A compressor includes: a housing for housing a rotary blade; a cylinder part having fixed blades and provided on an inner peripheral surface of the housing; and a PCV passage. The housing has a first opening penetrating through a wall of the housing. The cylinder part has a second opening which penetrates through a wall of the cylinder part and overlaps with the first opening. The PCV passage is inserted into the first opening and the second opening. An end of the PCV passage is located between an outer surface of the cylinder part and an inner surface of the cylinder part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a compressor.

Background Art

[0002] By supercharging the air with a compressor, the output of an internal combustion engine can be improved. In order to suppress the reverse flow of air, a fixed vane may be provided in the compressor housing of the compressor (for example, Patent Document 1, etc.).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to reflux blow-by gas, a PCV (Positive crankcase ventilation) passage may be connected to the intake passage. The gas flowing through the PCV passage (PCV gas) flows into the compressor together with air. Compared with the PCV gas, air is at a lower temperature. When the PCV gas and air merge, the PCV gas is cooled, and the moisture in the PCV gas condenses and precipitates as condensed water. There is a risk that the condensed water freezes and ice adheres near the outlet of the PCV passage. The ice may peel off and come into contact with the impeller, which may damage the impeller. Therefore, an object of the present invention is to provide a compressor capable of suppressing icing near the outlet of the PCV passage.

Means for Solving the Problems

[0005] The above object can be achieved by a compressor having a housing for accommodating a rotating blade, a fixed blade, a cylindrical portion provided on the inner peripheral surface of the housing, and a PCV passage. The housing has a first opening penetrating the wall of the housing. The cylindrical portion has a second opening penetrating the wall of the cylindrical portion and overlapping the first opening. The PCV passage is inserted into the first opening and the second opening, and the end of the PCV passage is located between the outer surface and the inner surface of the cylindrical portion.

[0006] The width of the second opening may be larger than the width of the first opening.

[0007] The first opening and the second opening may be located upstream of the rotating blade and the fixed blade in the direction of air flow.

Advantages of the Invention

[0008] A compressor capable of suppressing icing near the outlet of the PCV passage can be provided.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0010] FIG. 1(a) is a schematic diagram illustrating a compressor 100 according to an embodiment. The compressor 100 is a part of a supercharger mounted on a vehicle. The compressor 100 has a compressor housing 10, an impeller 12 (rotating blade), a cylindrical portion 14, and a PCV passage 16. Gas flows into the compressor 100 as shown by the arrows in FIG. 1.

[0011] The compressor housing 10 has a cavity inside. The impeller 12 is housed inside the compressor housing 10 and is connected to a turbine (not shown). The impeller 12 is rotatable.

[0012] A cylinder part 14 is attached to the compressor housing 10. The cylinder part 14 is press-fitted into the inner peripheral surface of the compressor housing 10. The outer peripheral surface of the cylinder part 14 contacts the inner peripheral surface of the compressor housing 10. A plurality of inlet splitters 15 (fixed vanes) are provided on the inner peripheral surface of the cylinder part 14. The inlet splitters 15 extend, for example, along the direction in which air flows. The plurality of inlet splitters 15 are arranged at intervals along the circumferential direction of the cylinder part 14.

[0013] The PCV passage 16 has a union 17 and a hose 18. In the direction in which the PCV gas flows, the union 17 is located on the downstream side of the hose 18, and the hose 18 is located on the upstream side of the union 17. One end of the union 17 is connected to a position upstream of the impeller 12 and the inlet splitter 15 among the compressor housing 10 and the cylinder part 14. The hose 18 is connected to the other end of the union 17. The hose 18 is connected to an internal combustion engine (not shown). The union 17 is made of metal. The hose 18 is made of, for example, rubber. The PCV gas flows through the PCV passage 16 and is introduced into the inside of the compressor housing 10.

[0014] An intake passage 20 is connected to one end of the compressor housing 10. Through the intake passage 20, air flows into the compressor housing 10.

[0015] In the direction in which air flows, the inlet splitter 15 and the impeller 12 are arranged in order from the upstream side to the downstream side. The air passes through the inlet splitter 15 and the impeller 12 and is introduced into an internal combustion engine (not shown). The PCV gas flows through the PCV passage 16, merges with the air, and is introduced into the internal combustion engine.

[0016] The exhaust gas of the internal combustion engine blows onto the turbine, causing the turbine to rotate. The impeller 12 rotates together with the turbine and compresses air.

[0017] Figure 1(b) is an enlarged view of the vicinity of the outlet of the PCV passage 16. The arrows in the figure represent the gas flow. As shown in Figure 1(b), the compressor housing 10 has an opening 11 (first opening). The opening 11 is a hole penetrating the wall of the compressor housing 10. The cylindrical portion 14 has an opening 13 (second opening). The opening 13 is a hole penetrating the wall of the cylindrical portion 14 and overlaps the opening 11. The opening 11 and the opening 13 form one hole. The diameter D1 (width) of the opening 13 is larger than the diameter D2 (width) of the opening 11. The openings 11 and 13 are located upstream of the impeller 12 and the inlet splitter 15.

[0018] The union 17 is press-fitted into the opening 11 of the compressor housing 10 and protrudes to the inside of the opening 13 of the cylindrical portion 14. The end 16a (the outlet of the PCV passage 16) of the PCV passage 16 is located inside the cylindrical portion 14 rather than on the outer surface 14a of the wall of the cylindrical portion 14 and outside the inner surface 14b of the wall of the cylindrical portion 14. The inner diameter of the PCV passage 16 is smaller than the diameter D2 of the opening 11 and the diameter D1 of the opening 13.

[0019] The PCV gas flows through the PCV passage 16, passes through the end 16a of the PCV passage 16, and merges with the air. If the moisture in the PCV gas freezes and ice is generated, the components of the compressor 100 may be damaged by the ice. For example, the impeller 12 may be damaged by the ice getting caught.

[0020] FIG. 2(a) is a diagram illustrating the compressor according to Comparative Example 1, and illustrates the vicinity of the outlet of the PCV passage 16. In the example of FIG. 2(a), the end portion 16a of the PCV passage 16 is located outside the outer surface 14a of the cylindrical portion 14. The opening 13 of the cylindrical portion 14 is wider than the opening 11 of the compressor housing 10. When the PCV gas flows out from the end portion 16a, it spreads from the PCV passage 16 to the opening 13 of the cylindrical portion 14. As the PCV gas spreads, the flow velocity decreases. Due to the decrease in the flow velocity, the moisture in the PCV gas may freeze and adhere to the end portion 16a or the end of the opening 13 of the cylindrical portion 14.

[0021] FIG. 2(b) is a diagram illustrating the compressor according to Comparative Example 2, and illustrates the vicinity of the outlet of the PCV passage 16. In the example of FIG. 2(b), the end portion 16a of the PCV passage 16 is located inside the inner surface 14b of the cylindrical portion 14. The decrease in the flow velocity of the PCV gas is suppressed. However, the union 17 of the PCV passage 16 is located inside the inner surface 14b and protrudes into the cavity inside the compressor housing 10. The air inside the compressor housing 10 collides with the union 17. The air flow is obstructed.

[0022] According to the present embodiment, as shown in FIG. 1(b), the PCV passage 16 is inserted into the opening 11 of the compressor housing 10 and the opening 13 of the cylindrical portion 14. The end portion 16a of the PCV passage 16 is located between the outer surface 14a and the inner surface 14b of the cylindrical portion 14. Since the end portion 16a is located inside the outer surface 14a, the PCV gas merges with the air immediately after passing through the end portion 16a. The decrease in the flow velocity due to the spreading of the PCV gas as in Comparative Example 1 is unlikely to occur. The freezing of moisture due to the decrease in the flow velocity is suppressed. The icing near the end portion 16a can be suppressed. Since the end portion 16a is located outside the inner surface 14b, the collision between the PCV passage 16 and the air is suppressed, and the air flow is less likely to be obstructed.

[0023] The press-fitting depth of the PCV passage 16 is from the outer surface 14a to the inner surface 14b of the cylindrical portion 14. The end portion 16a of the PCV passage 16 may be at the same position as the inner surface 14b. The end portion 16a may be at the same position as the outer surface 14a. However, when the end portion 16a is at the same position as the outer surface 14a, the PCV passage 16 is likely to come off. By having the end portion 16a at a position deeper than the outer surface 14a, the PCV passage 16 is press-fitted into the cylindrical portion 14. The PCV passage 16 is prevented from coming off or rotating.

[0024] When the opening 13 of the cylindrical portion 14 is smaller than the opening 11 of the compressor housing 10, the cylindrical portion 14 protrudes between the opening 11 and the opening 13 to form a step. Due to this step, the flow of the PCV gas is obstructed, and the flow velocity decreases. There is also a risk that moisture accumulates in the step and freezes. Therefore, as shown in Fig. 1(b), the width (diameter D1) of the opening 13 of the cylindrical portion 14 is made larger than the width (diameter D2) of the opening 11 of the compressor housing 10. The flow of the PCV gas is less likely to be obstructed. The convection of the gas and moisture is also suppressed.

[0025] The openings 11 and 13 are located upstream of the impeller 12 and the inlet splitter 15 in the direction of air flow. The PCV gas merges with the air upstream of the impeller 12 and the inlet splitter 15. The end portion 16a of the PCV passage 16 does not protrude from the inner surface 14b. The air is introduced into the impeller 12 without colliding with the PCV passage 16. The compressor 100 operates effectively. The inlet splitter 15 controls the air flow, for example, suppressing the backflow of air from the impeller 12 side. The gas flows more easily in the compressor housing 10, and the retention is suppressed. By suppressing the retention of the gas near the connection position of the PCV passage 16, the generation of ice is effectively suppressed.

[0026] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims.

Explanation of Reference Numerals

[0027] 10 Compressor housing 11, 13 Openings 12 Impeller 14 Cylindrical part 14a Outer surface 14b Inner surface 15 Inlet splitter 16 PCV passage 16a End part 17 Union 18 Hose 20 Intake passage 100 Compressor

Claims

1. A housing for storing a rotary wing, a fixed wing, and a cylindrical portion provided on the inner peripheral surface of the housing, a PCV passage, and the housing has a first opening penetrating the wall of the housing, the cylindrical portion has a second opening penetrating the wall of the cylindrical portion and overlapping the first opening, the PCV passage is inserted into the first opening and the second opening, and an end portion of the PCV passage is a compressor positioned between an outer surface and an inner surface of the cylindrical portion.

2. The compressor according to claim 1, wherein a width of the second opening is larger than a width of the first opening.

3. The compressor according to claim 1 or 2, wherein the first opening and the second opening are positioned upstream of the rotary wing and the fixed wing in a direction in which air flows.

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