Compressor

Abstract

To provide a compressor capable of inhibiting freezing of moisture in positive crankcase ventilation (PCV) gas.SOLUTION: A compressor includes: a housing which houses rotary blades; a cylinder part attached to the upstream side relative to the rotary blades in an air flow direction in the housing and having fixed blades on its inner peripheral surface; and a PCV passage connected to the housing. The housing, the cylinder part, and the PCV passage are made of metal.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a compressor.

Background Art

[0002] By supercharging 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 wing may be provided on 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 is precipitated as condensed water. There is a risk that the condensed water freezes and ice adheres to the inlet splitter or the like. The ice may come off and contact the impeller, which may damage the impeller. There is also a risk that the PCV passage is blocked by ice. Therefore, an object is to provide a compressor capable of suppressing the freezing of moisture in the PCV gas.

Means for Solving the Problems

[0005] The above object is achieved by A compressor provided in an intake passage of an internal combustion engine for compressing air flowing through the intake passage, the compressor being provided in the intake passage, a housing that houses a rotating blade, and the compressor being provided in the intake passage, a cylindrical portion that is attached to the upstream side in the air flow direction of the rotating blade in the housing and has a fixed wing on its inner peripheral surface.the internal combustion engine and a PCV passage connected to the housing, and at a position where the cylinder portion is attached to the housing, an outer peripheral surface of the cylinder portion contacts an inner peripheral surface of the housing, the PCV passage has a first portion and a second portion, the first portion is upstream of the rotary blade and the fixed blade in the housing and is connected to a portion of the housing where the cylinder portion is attached, reaching from outside the housing to an inner peripheral surface of the cylinder portion, the second portion is located upstream of the first portion in a direction in which gas flows in the PCV passage, and is connected to a portion of the first portion located outside the housing and the internal combustion engine, the housing, the cylinder part, and the PCV passage the first portion of are formed of metal is formed, and the second portion is formed of resin can be achieved by a compressor.

[0006] a plurality of the fixed blades are provided on the cylinder portion, the fixed blades extend along a direction in which air flows in the cylinder portion, and the plurality of fixed blades may be spaced apart along a circumferential direction of the cylinder portion . [Effect of the Invention]

[0008] It is possible to provide a compressor capable of suppressing freezing of moisture in PCV gas. [Brief Description of the Drawings]

[0009]

Figure 1

[0010] FIG. 1 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 (rotary vane), a cylinder part 14, and a PCV passage 16. Gas flows into the compressor 100 as indicated by the arrows in FIG. 1.

[0011] The compressor housing 10 is made of metal and 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] The cylinder part 14 is attached to the compressor housing 10. The cylinder part 14 is made of metal and is press-fitted onto 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 (first part) and a hose 18 (second part). In the direction in which the PCV gas flows, the union 17 is located downstream of the hose 18, and the hose 18 is located upstream of the union 17. One end of the union 17 is connected to a position upstream of the impeller 12 and the inlet splitters 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, resin. The thermal conductivity of the hose 18 is lower than that of metal. 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 splitters 15 and the impeller 12 are arranged in order from the upstream side to the downstream side. The air passes through the inlet splitters 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 turbine rotates when the exhaust of the internal combustion engine is blown onto the turbine. The impeller 12 rotates together with the turbine and compresses the air.

[0017] The PCV gas and air merge inside the compressor housing 10. When the high-temperature PCV gas merges with the air and is cooled, the moisture in the PCV gas is likely to freeze. If ice adheres to the inside of the compressor housing 10, there is a risk that the components of the compressor 100 will be damaged. For example, there is a risk that ice will bite into the impeller 12 and cause damage. When the PCV passage 16 is blocked by ice, it becomes difficult to introduce the PCV gas.

[0018] According to the present embodiment, the union 17 of the compressor housing 10, the cylinder portion 14, and the PCV passage 16 is made of metal. The compressor housing 10 and the cylinder portion 14 are formed of, for example, aluminum (Al). The union 17 is formed of, for example, iron (Fe). The compressor housing 10, the cylinder portion 14, and the union 17 have a higher thermal conductivity than resin or the like. Heat is conducted from the internal combustion engine, exhaust, engine oil, etc. to the compressor 100. Since the metal compressor housing 10, the cylinder portion 14, and the union 17 are made of metal, they are likely to increase in temperature by heat conduction. As the temperature rises, it becomes difficult to cool the moisture in the PCV gas. Condensation and freezing of the moisture are suppressed. Damage to the compressor 100 is suppressed.

[0019] The PCV passage 16 is connected upstream of the impeller 12 and the inlet. The inlet splitter 15 is located downstream of the position in the compressor housing 10 where the PCV passage 16 is connected. The inlet splitter 15 controls the flow of air and suppresses, for example, the backflow of air from the impeller 12 side. The gas can flow more easily through the compressor housing 10, and stagnation is suppressed. By suppressing the stagnation of the gas near the connection position of the PCV passage 16, the generation of ice is effectively suppressed.

[0020] The PCV passage 16 has a union 17 and a hose 18. Since the union 17 is made of metal, the union 17 has high thermal conductivity. Condensation and freezing of moisture can be suppressed near the union 17. Since the hose 18 is made of resin, for example, it has lower thermal conductivity than the metal union 17. That is, the heat retention property of the hose 18 is high. The heat of the PCV gas flowing through the hose 18 is not easily taken away. Since the moisture in the PCV gas is not easily cooled to a low temperature, freezing is suppressed.

[0021] The compressor housing 10 and the cylinder part 14 may be formed of aluminum. The union 17 of the PCV passage 16 may be formed of iron. The compressor housing 10, the cylinder part 14, and the union 17 may be formed of the same type of metal. Two of the compressor housing 10, the cylinder part 14, and the union 17 may be formed of the same type of metal. The compressor housing 10, the cylinder part 14, and the union 17 may be formed of different metals. The metal may be selected according to weight, mechanical strength, etc.

[0022] 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

[0023] 10 Compressor housing 12 Impeller 14 Cylinder part 15 Inlet splitter 16 PCV passage 17 Union 18 Hose 20 Intake passage 100 Compressor

Claims

1. A compressor provided in an intake passage of an internal combustion engine for compressing air flowing through the intake passage, comprising a housing provided in the intake passage for housing rotating blades, a cylindrical portion provided in the intake passage, attached upstream of the rotating blades in the air flow direction within the housing, and having fixed blades on its inner peripheral surface, a PCV passage connected to the internal combustion engine and the housing, wherein at the position where the cylindrical portion is attached to the housing, the outer peripheral surface of the cylindrical portion contacts the inner peripheral surface of the housing, the PCV passage has a first portion and a second portion, the first portion is upstream of the rotating blades and the fixed blades within the housing, connected to the portion of the housing where the cylindrical portion is attached, and reaches from outside the housing to the inner peripheral surface of the cylindrical portion, the second portion is located upstream of the first portion in the gas flow direction within the PCV passage, connected to the portion of the first portion located outside the housing and the internal combustion engine, the housing, the cylindrical portion, and the first portion of the PCV passage are formed of metal, and the second portion is formed of resin.

2. A plurality of the fixed blades are provided on the cylindrical portion, the fixed blades extend along the air flow direction in the cylindrical portion, and the plurality of fixed blades are spaced apart along the circumferential direction of the cylindrical portion. The compressor according to claim 1.

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