Intake structure of a vehicle and method for attaching a nipple to the intake structure

Abstract

Intake structure of a vehicle, comprising: an intake hose (300) mounted between an air filter (100) and a compressor (200) of a turbocharger; characterized by a pocket part (310) formed on an inner side wall surface of the intake hose (300) and in which an oil contained in a blow-by gas is collected, wherein the pocket part (310) comprises: a volume part (311) which is attached to a mounting bracket (360) formed on the intake hose (300); and a bottom part (312) attached to an end portion of the volume part (311) to seal the volume part (311), wherein the volume part (311) has the depth from the inner side wall surface of the suction hose (300) to the bottom part (312), wherein a fresh air nipple (320) configured to supply fresh air to an engine in which the blow-by gas is generated is attached to the intake hose (300), and wherein the fresh air nipple (320) comprises: a connecting part (322) arranged outside the suction hose (300); an extension part (323) extending from the connecting part (322) and arranged within the volume part (311); and a projection part (324) extending from the extension part (323) into the suction hose (300), wherein the extension part (323) penetrates the center of the base part (312), wherein the pocket part (310) and the fresh air nipple (320) are integrated, wherein the intake hose (300) is fitted with a recirculation nipple (350) in which the intake air compressed by the compressor (200) of the turbocharger is recirculated to the intake hose (300), wherein one side of the compressor (200) of the turbocharger is fitted with a vent nipple (210) into which the blow-by gas flows, and wherein the recirculation nipple (350) is arranged between the vent nipple (210) and the fresh air nipple (320).

Description

BACKGROUND OF THE INVENTIONTechnical field

[0001] The present disclosure relates to an intake structure of a vehicle and a method for attaching a nipple to the intake structure, and more particularly to an intake structure of a vehicle having a nipple for preventing engine oil from flowing back along the nipple and a method for attaching the nipple to the intake structure that prevents oil contained in a blow-by gas from flowing into a fresh air nipple that supplies fresh air to an engine or a brake booster. Description of the state of the art

[0002] Intake air is fed into a combustion chamber for fuel combustion. An intake manifold is installed in the engine to supply the intake air. As shown in Fig. 1 of the prior art, the intake pipe includes an intake shield, an intake duct, an air cleaner, and an intake hose. The intake hose is connected to a surge tank, an intake manifold, and the like. As shown in Fig. 1, when a compressor of a turbocharger is mounted at the front end of the expansion tank or the intake manifold, the turbocharger and the intake hose are connected to each other.

[0003] When a turbocharger is attached to an engine, a pressure equal to or greater than atmospheric pressure is generated between the turbocharger compressor and the engine through the operation of a turbine and the compressor that configures the turbocharger. When the throttle valve opening is minimal, a load greater than necessary may be generated in the throttle valve or the turbocharger compressor. Therefore, a circulation line is installed between the front and rear ends of the turbocharger compressor to circulate the intake air. The circulation line is equipped with a pressure-sensitive valve. The pressure-sensitive valve is actuated to open when the internal pressure of the circulation line reaches a certain value or more, and to maintain a closed state when the internal pressure is below the certain value.

[0004] If the throttle valve opening is reduced during constant-speed or idling operation, the intake pressure of the turbocharger's compressor may be greater than its discharge pressure. In this case, the compressor's compression efficiency is reduced, and some intake air flows backward along the inner surface of the intake hose connected to the compressor.

[0005] Meanwhile, during engine operation, blow-by gas collects within a cylinder block through the gap between a piston and a cylinder. If excessive blow-by gas accumulates in the cylinder block, the engine may not operate normally. Therefore, the blow-by gas collected in the cylinder block is eliminated by recirculating it into the intake manifold.

[0006] As in Fig. As shown in Figure 1, when the turbocharger is mounted on the engine, a vent nipple is installed between the compressor and the intake hose to capture the blow-by gas. Additionally, a fresh air nipple, which supplies fresh air to the cylinder block, is installed on the intake hose to adequately maintain the internal pressure of the cylinder block and prevent excessive concentration of blow-by gas.

[0007] As described above, when the compression efficiency of the turbocharger's compressor decreases, a portion of the intake air flows back along the inner surface of the intake hose. The blow-by gas recirculated to the intake manifold through the vent nipple can reach the fresh air nipple through the returning intake air. Because the fresh air nipple supplies fresh air to the cylinder block, the blow-by gas is forced back into the cylinder block.

[0008] In addition, the blow-by gas contains intake air, exhaust air, mixed air, oil, and the like. If the blow-by gas flows back, an air filter may be contaminated by the oil, reducing engine power. If the oil flows into the fresh air nipple, the fresh air nipple may become clogged. If the fresh air nipple is clogged, it will not be possible to prevent the adjustment of the internal pressure of the cylinder block, the excessive concentration of blow-by gas, and the like. In addition, the fresh air nipple may also be connected to a brake booster, and if the fresh air nipple is clogged by the oil contained in the blow-by gas, the brake cannot operate normally (e.g., the brake may fail or malfunction).

[0009] Further examples of previously known configurations can be found in WO 2007 / 045322 A1, KR 10 2005 035349 A, KR 10 2575148 B1, and US 2004 / 0222631 A1. The disclosure of WO 2007 / 045322 A1 forms the basis for the two-part subdivision of independent device claim 1.

[0010] The content described in this section is intended only to assist in understanding the background of the present disclosure and may include what is not previously known to those skilled in the art to which the present disclosure pertains. PRESENTATION OF THE INVENTION

[0011] An object of the present disclosure, which has been invented in consideration of the above point, is to provide an intake structure of a vehicle having a nipple for preventing engine oil contained in a blow-by gas from flowing back along the nipple, and a method of attaching the nipple to the intake structure for preventing the engine oil from flowing back along the nipple.

[0012] This object is achieved by a suction structure having the features of claim 1 and / or by a method for attaching a nipple to a suction structure having the features of claim 9. Further embodiments emerge from the dependent claims.

[0013] An intake structure according to an exemplary embodiment of the present disclosure may include an intake hose installed between an air cleaner and a compressor of a turbocharger, and a pocket portion in which oil contained in a blow-by gas is collected may be formed on the inner sidewall surface of the intake hose. Furthermore, the pocket portion may include a volume portion fixed to a mounting bracket formed on the intake hose, and a bottom portion attached to the end portion of the volume portion to seal the volume portion. The volume portion may have a depth from the inner sidewall surface of the intake hose to the bottom portion.

[0014] Additionally, a fresh air nipple may be attached to the intake hose to supply fresh air to an engine in which blow-by gas is generated. The fresh air nipple may include a connecting portion located outside the intake hose, an extension portion extending from the connecting portion and located inside the volume portion, and a protrusion portion extending from the extension portion into the intake hose. The extension portion may penetrate the center of the base portion, and the pocket portion and fresh air nipple may be integrated. The total length of the extension portion and the protrusion portion may be greater than the depth of the pocket portion and smaller than the radius of the inner diameter of the intake hose.

[0015] Furthermore, a projection may be formed on the projection portion. The projection may be formed continuously on the outer peripheral surface of the projection portion at a right angle to the longitudinal center axis of the projection portion. Two or more projections may be formed to have spacing distances from the end portion of the projection portion toward the inner side wall surface of the intake hose.

[0016] Furthermore, the end portion of the intake hose may include a buffer portion configured to absorb engine vibrations, and a perforated resonator may be mounted on the intake hose to be close to the buffer portion. The perforated resonator may include a tubular housing portion attached to the inner surface of the intake hose, and the housing portion may be formed with a plurality of openings penetrating the housing portion. The perforated resonator may be positioned closer to the air cleaner than the bag portion.

[0017] The intake hose may be provided with a recirculation nipple, through which the intake air compressed by the turbocharger compressor is recirculated to the intake hose. One side of the turbocharger compressor may be provided with a vent nipple into which the blow-by gas flows, and the recirculation nipple may be located between the vent nipple and the fresh air nipple. Furthermore, the recirculation nipple may be attached to the intake hose so that it protrudes toward the inside of the intake hose. The length of the recirculation nipple, which protrudes from the inner sidewall surface of the intake hose, may be approximately 5 mm to 10 mm.

[0018] The end portion of the fresh air nipple may be located closer to the center portion of the intake hose than the end portion of the recirculation nipple. Additionally, the recirculation nipple may be attached to the intake hose, so that the end portion of the recirculation nipple located in the intake hose may be inclined closer to the turbocharger compressor than the connection point between the intake hose and the recirculation nipple. Additionally, an anti-loosening protrusion may be formed on the outer surface of the volume part, and the inner surface of the mounting bracket may be provided with a fastening groove that is secured to the anti-loosening protrusion.

[0019] A method for attaching a nipple to an intake structure of a vehicle to prevent engine oil from flowing back along the nipple according to an exemplary embodiment of the present disclosure may include attaching the bulk member to the mounting bracket to fix the anti-loose protrusion formed on the outer peripheral surface of the bulk member to a fixing groove disposed within the mounting bracket.

[0020] Additionally, prior to attaching the volume part to the mounting bracket, an epoxy-based adhesive may be applied to the outer peripheral surface of the volume part. After attaching the volume part to the mounting bracket, the volume part and the mounting bracket may be heat-treated in an oven. The method may further comprise connecting the hose to the connecting part, and connecting the hose to the connecting part may comprise attaching the hose to the connecting part and securing a clamp to the overlap portion between the hose and the connecting part.

[0021] According to the inlet structure that prevents the engine oil from flowing back along the nipple and the method of attaching the nipple to the inlet structure that prevents the engine oil from flowing back along the nipple according to an exemplary embodiment of the present disclosure provided as described above, since the pocket part can be formed on the inner side wall surface of the intake hose, the oil contained in the blow-by gas can be collected in the pocket part even when a part of the blow-by gas flows back along the inner side wall surface of the intake hose due to the operating state, and thus the oil contained in the blow-by gas can be prevented from flowing into the fresh air nipple.

[0022] In addition, even if oil is present in the blow-by gas recirculated through the recirculation nipple to the intake hose, the oil can be collected in the pocket portion or condensed in the protrusion formed on the surface of the fresh air nipple, thereby preventing the oil present in the recirculated blow-by gas from flowing into the fresh air nipple. Since the perforated resonator is attached to the intake hose, it may be possible to reduce the noise caused by the intake air and prevent the oil from flowing from the intake hose into the air cleaner. In addition, contamination of the air cleaner by the oil can be prevented, and the fresh air supply to the brake booster can be prevented from being blocked. SHORT DESCRIPTION OF THE CHARACTERS

[0023] The objects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which: Fig. 1 is an exemplary diagram illustrating an intake pipe of an engine to which a general turbocharger according to the prior art is attached; Fig. 2 to 4 are exemplary diagrams illustrating a suction structure for preventing backflow of engine oil along a nipple according to an exemplary embodiment of the present disclosure; Fig. 5 is an exemplary diagram showing a fresh air nipple of Fig. 2 according to an exemplary embodiment of the present disclosure; Fig. 6 and Fig. 7 are exemplary diagrams illustrating the connection between the fresh air nipple and a fresh air hose according to an exemplary embodiment of the present disclosure; Fig. 8 is an exemplary diagram illustrating an intake hose according to an exemplary embodiment of the present disclosure; and Fig. 9 is a flowchart illustrating a method of securing the nipple to the intake structure to prevent the engine oil from flowing back along the nipple, according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0024] The term “vehicle” or “companion” or any other similar term as used herein is understood to include motor vehicles in general, such as passenger cars including sport utility vehicles (SUVs), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft and the like, and also hybrid vehicles, electric vehicles, internal combustion engines, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g., fuels derived from resources other than petroleum).

[0025] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a," "an," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It is further understood that the terms "comprising" and / or "comprises," when used in this specification, indicate the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes all combinations of one or more of the associated stated elements.

[0026] Unless expressly stated or obvious from the context, as used herein, the term "approximately" is understood to mean within a range of tolerance customary in the art, for example, within 2 standard deviations of the mean. The term "approximately" can be understood to mean within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05%, or 0.01% of the stated value. Unless the context otherwise indicates, all numerical values ​​stated herein are modified by the term "approximately."

[0027] Hereinafter, a suction structure that prevents engine oil from flowing back along a nipple and a method of attaching the nipple to the suction structure that prevents the engine oil from flowing back along the nipple according to an exemplary embodiment of the present disclosure will be described with reference to the accompanying drawings.

[0028] As in Fig. As shown in FIGS. 2 to 4, an intake structure that prevents engine oil from flowing back along a nipple according to an exemplary embodiment of the present disclosure may include an intake hose 300 disposed between an air cleaner 100 and a compressor 200 of a turbocharger. A vent nipple 210 into which blow-by gas flows may be disposed on one side of the compressor 200 of the turbocharger. A pocket portion 310, in which the oil contained in the blow-by gas is collected, may be formed on the inner side wall surface of the intake hose 300.

[0029] The pocket part 310 may include a volume part 311 (e.g., a container or a volume compartment) attached to a mounting bracket 360 formed on the intake hose 300, and a bottom part 312 attached to the end portion of the volume part 311 to seal the volume part 311. The volume part 311 may have a depth from the inner side wall surface of the intake hose 300 to the bottom part 312. The volume part 311 and the bottom part 312 may have a trough shape.

[0030] The intake hose 300 may be attached to a fresh air nipple 320 configured to supply fresh air (e.g., newly drawn air) to an engine in which the blow-by gas is generated. The fresh air nipple 320 may include a connecting portion 322 disposed outside the intake hose 300, an extension portion 323 extending from the connecting portion 322 and disposed within the volume portion 311, and a protrusion portion 324 extending from the extension portion 323 into the intake hose 300. The extension portion 323 may penetrate the center of the bottom portion 312. The pocket portion 310 and the fresh air nipple 320 may be integrated with each other.

[0031] Based on the operating condition, when a portion of the blow-by gas flows back along the inner sidewall surface of the intake hose 300, the backflowing blow-by gas reaches the pocket part 310. If the oil is contained in the blow-by gas, the oil may collect in the pocket part 310. When the oil collected in the pocket part 310 reaches a threshold, the oil falls freely and can flow into the engine due to the engine negative pressure.

[0032] As in Fig. 5, the total length of the extension part 323 and the projection part 324 may be greater than the depth of the pocket part 310 and smaller than the radius of the inner diameter of the intake hose 300. Accordingly, even if a part of the blow-by gas flows back along the inner side wall surface of the intake hose 300 relative to the operating state, the open end portion of the projection part 324 may not be affected by the backflowing blow-by gas.

[0033] A projection 321 may be formed on the projection portion 324. The projection 321 may be formed continuously on the outer peripheral surface of the projection portion 324 at a right angle to the longitudinal center axis of the projection portion 324. The projection 321 may be formed annularly on the outer peripheral surface of the projection portion 324. Two or more projections 321 may be formed to have distances from the end portion of the projection portion 324 to the inner surface of the intake hose 300.

[0034] When oil is present in the blow-by gas recirculated through a recirculation nipple 350 to the intake hose 300, the oil may condense on the protrusion 321 formed on the surface of the fresh air nipple 320. Accordingly, the oil present in the recirculated blow-by gas can be prevented from flowing into the fresh air nipple 320. The oil condensed on the protrusion 321 falls freely if there is a sufficient amount and can flow into the engine due to the engine vacuum. The oil present in the recirculated blow-by gas can also be collected in the pocket part 310. Furthermore, the oil falling from the pocket part 310 can form on the protrusion 321. After falling from the pocket part 310, the oil formed on the projection 321 can also fall freely when the limit amount is reached and flow into the engine due to the engine negative pressure.

[0035] As in Fig. As shown in Figure 6, the fresh air hose 325 may be attached to a lateral end portion of the fresh air nipple 320 located outside the intake hose 300. An annular clamp 326 may be attached to the overlap portion between the fresh air nipple 320 and the fresh air hose 325.

[0036] As in Fig. As shown in Figure 7, the fresh air nipple 320 may be formed integrally with the pocket portion 310. An epoxy-based adhesive may be applied to the exterior of the pocket portion 310, which adhesive is secured to a mounting opening formed in the intake hose 300. Additionally, the intake hose 300 may be attached to the fresh air nipple 320 and the pocket portion 310 by heat treatment in an oven at approximately 150 degrees Celsius.

[0037] Meanwhile, as in Fig. 3, the recirculation nipple 350, in which the intake air compressed by the compressor 200 of the turbocharger is recirculated into the intake hose 300, may be attached to the intake hose 300. The recirculation nipple 350 may be arranged between the vent nipple 210 and the fresh air nipple 320. The recirculation nipple 350 may be attached to the intake hose 300 so that it protrudes toward the inside of the intake hose 300. To minimize airflow resistance inside the intake hose 300, the length of the recirculation nipple 350 protruding from the inner sidewall surface of the intake hose 300 may be approximately 5 mm to 10 mm.

[0038] The end portion of the fresh air nipple 320 may be positioned closer to the center of the intake hose 300 than the end portion of the recirculation nipple 350, allowing the recirculated blow-by gas to flow back along the inner sidewall surface of the intake hose 300 to prevent the recirculated blow-by gas from flowing into the fresh air nipple 320. The recirculation nipple 350 may be positioned within the intake hose 300 such that the flow direction of the intake air and the flow direction of the recirculated blow-by gas coincide with each other. The recirculation nipple 350 may be attached to the intake hose 300 such that the end portion of the recirculation nipple 350 may be inclined closer to the compressor 200 of the turbocharger than the junction between the intake hose 300 and the recirculation nipple 350.

[0039] The recirculated blow-by gas flowing through the recirculation nipple 350 into the intake hose 300 can be discharged from the central portion of the intake hose 300 toward the compressor 200 of the turbocharger at an angle equal to the length and inclination of the recirculation nipple 350. As shown in Fig. 3 and Fig. As shown in Figure 4, the end portion of the intake hose 300 may include a buffer portion 330 configured to absorb engine vibrations. The perforated resonator 340 may be attached to the intake hose 300 to be positioned near the buffer portion 330. The perforated resonator 340 may be positioned in the intake hose 300 closer to the air cleaner 100 than the pocket portion 310.

[0040] The perforated resonator 340 may include a tubular housing member 341 attached to the inner surface of the intake hose 300. The housing member 341 may be provided with a plurality of openings 342 penetrating the housing member 341. The recirculated blow-by gas may be prevented from flowing back from the turbocharger compressor 200 to the intake hose 300 by the perforated resonator 340, or the oil present in the blow-by gas recirculated from the intake manifold side, which is the rear end of the turbocharger compressor 200, to the intake hose 300, which is the front end of the turbocharger compressor 200, may be prevented from flowing from the intake hose 300 into the air cleaner 100. The intake air noise can be reduced by the perforated resonator 340.

[0041] Meanwhile, as in Fig. 8, folds 301 may be formed on the surface of the intake hose 300. When the intake hose 300 is connected to the air cleaner 100 or the turbocharger compressor 200, the connection point protruding from the air cleaner 100 or the turbocharger compressor 200 and the point where the folds 301 may be formed overlap, and the annular clamp may be attached to the overlapping portion so that the intake hose 300 can be connected to the air cleaner 100 or the turbocharger compressor 200.

[0042] According to the Fig. 9, the intake structure that prevents the engine oil from flowing back along the nipple can be attached to the fresh air nipple according to an exemplary embodiment of the present disclosure configured as described above. As shown in Fig.9, a method of attaching the nipple to the intake structure for preventing the engine oil from flowing back along the nipple according to an exemplary embodiment of the present disclosure may include attaching the volume part 311 to the mounting bracket 360, disposing an anti-loose protrusion 313 formed on the outer peripheral surface of the volume part 311 in the attachment groove 361 provided inside the mounting bracket 360 (S100), and connecting the hose 325 to the connecting part 322 (S200).

[0043] Before attaching the volume part 311 to the mounting bracket 360 (S100), an epoxy-based adhesive may be applied to the outer peripheral surface of the volume part 311. After attaching the volume part 311 to the mounting bracket 360 (S100), the volume part 311 and the mounting bracket 360 may be heat-treated in an oven. The heat-treatment temperature may be approximately 150 degrees Celsius. Furthermore, connecting the hose 325 to the connecting part 322 (S200) may include attaching the hose 325 to the connecting part 322 (S210) and attaching the clamp 326 to the overlap portion between the hose 325 and the connecting part 322 (S220). When attaching the clamp 326 to the overlap portion between the hose 325 and the connecting part 322 (S220), the clamp 326 can be moved from the center side of the hose 325 toward the overlap portion.

[0044] According to the inlet structure that prevents the engine oil from flowing back along the nipple and the method of attaching the nipple to the inlet structure that prevents the engine oil from flowing back along the nipple according to an exemplary embodiment of the present disclosure provided as described above, since the pocket part 310 can be formed on the inner side wall surface of the intake hose 300, the oil contained in the blow-by gas can be trapped in the pocket part 310 even when a part of the blow-by gas flows back along the inner side wall surface of the intake hose 300 with respect to the operating state, so that the oil contained in the blow-by gas can be prevented from flowing into the fresh air nipple 320.

[0045] Furthermore, even if oil is present in the blow-by gas returned to the intake hose 300 through the return nipple 350, the oil can be collected in the pocket part 310 or condensed in the protrusion 321 formed on the surface of the fresh air nipple 320, so that the oil present in the returned blow-by gas can be prevented from flowing into the fresh air nipple 320. Since the perforated resonator 340 can be attached to the intake hose 300, it may be possible to reduce the noise caused by the intake air and prevent the oil from flowing from the intake hose 300 into the air cleaner 100.

Claims

[1] Intake structure of a vehicle, comprising: an intake hose (300) mounted between an air filter (100) and a compressor (200) of a turbocharger; characterized by a pocket part (310) formed on an inner side wall surface of the intake hose (300) and in which an oil contained in a blow-by gas is collected, wherein the pocket part (310) comprises: a volume part (311) which is attached to a mounting bracket (360) formed on the intake hose (300); and a bottom part (312) attached to an end portion of the volume part (311) to seal the volume part (311), wherein the volume part (311) has the depth from the inner side wall surface of the suction hose (300) to the bottom part (312), wherein a fresh air nipple (320) configured to supply fresh air to an engine in which the blow-by gas is generated is attached to the intake hose (300), and wherein the fresh air nipple (320) comprises: a connecting part (322) arranged outside the suction hose (300); an extension part (323) extending from the connecting part (322) and arranged within the volume part (311); and a projection part (324) extending from the extension part (323) into the suction hose (300), wherein the extension part (323) penetrates the center of the base part (312), wherein the pocket part (310) and the fresh air nipple (320) are integrated, wherein the intake hose (300) is fitted with a recirculation nipple (350) in which the intake air compressed by the compressor (200) of the turbocharger is recirculated to the intake hose (300), wherein one side of the compressor (200) of the turbocharger is fitted with a vent nipple (210) into which the blow-by gas flows, and wherein the recirculation nipple (350) is arranged between the vent nipple (210) and the fresh air nipple (320). [2] The suction structure according to claim 1, wherein the total length of the extension part (323) and the projection part (324) is greater than the depth of the pocket part (310) and smaller than the radius of the inner diameter of the suction hose (300). [3] The intake structure according to claim 2, wherein a projection (321) is formed on the projection part (324). [4] The suction structure according to claim 3, wherein two or more projections (321) are formed to have distance intervals from an end portion of the projection part (324) toward the inner side wall surface of the suction hose (300). [5] An intake structure according to any preceding claim, wherein an end portion of the intake hose (300) has a buffer member (330) configured to absorb the vibrations of the engine, and wherein a perforated resonator (340) is attached to the intake hose (300) to approach the buffer member (330). [6] The intake structure according to claim 5, wherein the perforated resonator (340) comprises a tubular housing part (341) fixed to the inner surface of the intake hose (300), and wherein the housing part (341) is formed with a plurality of openings (342) penetrating the housing part (341). [7] Intake structure according to one of the preceding claims, wherein an end portion of the fresh air nipple (320) is arranged closer to a center of the intake hose (300) in the flow direction than an end portion of the recirculation nipple (350). [8] The intake structure according to any one of the preceding claims, wherein an anti-loosening projection (313) is formed on the outer surface of the volume part (311), and wherein the inner surface of the mounting bracket (360) is provided with a fixing groove (361) fixed to the anti-loosening projection (313). [9] A method of attaching a nipple to a suction structure according to claim 8, the method comprising the following steps: Applying an epoxy-based adhesive to the outer peripheral surface of the volume part (311); Attaching the volume part (311) to the mounting bracket (360) to fix the anti-loosening projection (313) formed on the outer peripheral surface of the volume part (311) to the fixing groove (361) provided inside the mounting bracket (360); and Heat treating the volume part (311) and the mounting bracket (360) in a furnace. [10] The method of claim 9, further comprising the steps of: Connecting the hose (325) to the connecting part (322), wherein connecting the hose (325) to the connecting part (322) comprises: Attaching the hose (325) to the connecting part (322); and Attaching a clamp (326) to an overlap portion between the hose (325) and the connecting part (322).

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