The present application relates to a housing for a centrifugal or radial flow compressor, for example a turbocharger, comprising a first housing part and a second housing part joined together to form at least part of the housing. For securing the housing parts to each other, a cavity is formed in each housing part. Together the cavities form, in a predetermined juxtaposed location of the housing parts, a cavity system, the cavities of the housing parts being in fluid communication with each other. To secure the housing parts, after being joined together, a fluid joining compound such as an adhesive, thermoplastics material, etc., is introduced into the cavity system. Due to the fluid action of the plastics material, the cavity system is completely filled. After a brief reaction, the plastics material hardens to form a solid, rigid joint between the housing parts.
A housing made in this way for a radial flow compressor having a proven record of success because of its high strength is known from DE 103 14 209 B3, featuring an input and an output in one of the housing parts for injecting the fluid joining compound and for compensating the air pressure respectively. Via the input, the fluid joining compound is injected to fill the cavity system, whereas the expelled air is able to escape via the output.
What is needed is a housing for a radial flow compressor, the manufacture of which, using the known method of joining housing parts by filling a cavity system with a fluid curing joining compound, is simplified.
The following summary is provided to introduce various concepts in a simplified form that are further described below in the Detailed Description. This summary is not intended to identify specific key features of the claimed subject matter.
Described herein is a housing for a radial flow or centrifugal compressor, an example of which is a turbocharger. The housing is comprised of housing parts that have a gap for introducing fluid joining compound when the housing parts are juxtaposed along facing joining surfaces. The housing parts are dimensioned such that the gap extends from a free housing surface of the housing parts and ports into a cavity system. It has been surprisingly discovered that providing a channel for introducing the fluid joining compound by means of the gap at the joining surface now eliminates the complicated working steps of producing inputs and channels in a housing part. Additionally, the channel formed by the gap now creates an additional joining volume between the housing parts, as a result of which a highly reliable joint is now achieved between the housing parts.
Preferably, the first housing part and the second housing part define a compressor channel of the radial flow compressor. As a result, the first housing part may form a radial outer portion of the compressor channel and the second housing part may form a radial inner portion of the compressor channel, said inner portion being insertable into said outer portion in loose juxtaposition. The first housing part may form an inlet portion for an air intake port, while the second housing part may define a transition of the air intake port that opens out to the compressor channel.
In one preferred embodiment, the gap runs on a circular track, particularly in a circumferential plane, around the axis of the air intake port, achieving a homogenous solid joining structure of the housing formed by the two housing parts. In particular, the gap may concentrically surround the axis of the air intake port.
In another embodiment, the gap runs essentially radially from the free surface of the housing and preferably translates from a radial run into an axial section that ports into the cavity system.
In this arrangement, the cavity system is essentially radially oriented. The cavity system may be configured as a labyrinth structure having at least one passage. A particularly simple, but nevertheless sufficiently rugged and solid joining structure is formed using a cavity system comprising two radial recesses in the housing parts. The fluid joining compound introduced via the gap collects in the recesses until completely full therewith.
Preferably the gap extends radially outward from a free (inner) surface of the air intake port. The radial inner surface of the air intake port is thus suitable for positioning a entry portion adjacent to the gap for introducing the joining compound. It is here where free access is available for locating and placing corresponding means for pouring or introducing the joining compound in the gap. In one embodiment, the joining compound is injected into the gap.
To ensure proper positioning of the second housing part to the first housing part, each of the joining surfaces of the housing part form, in addition to the joint surface sections forming the gap, flange surface sections likewise each facing the other. When the housing parts are juxtaposed, the flange surface sections touch each other, while the joint surface sections forming the gap face each other without touching. In this arrangement the housing parts are manufactured such that the gap is formed without additional machining of the housing parts once the housing parts have assumed the position as located by the flange surface sections.
In another preferred embodiment, a seal is arranged in the region of the jointing surfaces at a side of the cavity system facing away from the gap. The seal may be in particular a sealing paste as may be arranged in the region of an axial joining flange portion connecting the radial gap to a radial section surface of the joining surfaces. For the seal, a recess may be provided in which the recess is formed at least by one of the housing parts and in which in particular an O-ring can be inserted.
Preferably, the seal is designed to prevent air leakage from the compressor channel to the output port, but to allow air to pass the seal when the joining compound is introduced via the gap to the cavity structure. However, the seal should hamper any flow-by of the joining compound beyond the location of the seal.
The invention also relates to a centrifugal or radial flow compressor, for example a turbocharger, comprising a housing as described herein.
Further advantages, properties and features of the invention will now be detailed by way of a preferred embodiment with reference to the enclosed drawings in which:
Referring now to
Each of the housing parts 3 and 5 has a joining surface 11, 13 substantially complementary in shape extending concentrically about the axis of rotation R of the housing 1. The joining surfaces 11, 13 extend from the inner side of the air intake port 9 z-wise radially outwards and port into the free surface area of the compressor channel 7.
On the outer side, the joining surfaces 11, 13 each comprise radially a flange surface section 15. The flange surface sections 15 are juxtaposed in the assembled condition of the housing parts 3, 5 to ensure that the housing part 3, 5 are properly positioned relative to each other.
Adjoining each flange surface section 15 and extending radial inwards from the free surface of the compressor channel 7 is an axial joining surface portion 17, 19 at which a recess 21 is configured near to the flange surface section 15 seating an O-ring 23.
Adjoining a side of the recess 21 facing away from the flange surface sections 15 is a cavity system 25 which in the embodiment shown in
Referring now to
Once the housing parts 3, 5 have been juxtaposed with the flange surface sections 15 juxtaposed, an injection tool (not shown) can be applied into the air intake port 9 in the region of the gap and a fluid joining compound 41 can be injected via the gap into the cavity system 25. The O-ring seal is designed to allow the air expelled on injection of the fluid joining compound 41 to pass while hampering flow-by thereof of the joining compound past the O-ring.
The rigid housing structure produced in this way following hardening of the fluid joining compound can be secured to a further housing part of the turbocharger or engine part (not shown) by a bolt fastener 37 so that the turbocharger can be fitted in the region of the intake tract of a motor vehicle.
The features as disclosed in the above description, figures and the subsequent claims may be of significance both singly and in any combination in realizing the invention in its various embodiments.
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