DE1476598A1 - Water-jacketed exhaust pipe, particularly for marine engines, and process for their manufacture - Google Patents

Description

Dr. Expl. [

Applicant: Sutton Power (Equipment) Limited, Victoria Road,
Burgess Hill,
Sussex, England

"Water jacket exhaust line, especially for ship engines, and process for their production "

The invention relates to water jacket exhaust pipes, in particular for ship engines, and processes for their manufacture.

So far, the conventional water jacket exhaust pipes for marine engines have generally been used as metal castings, for example made of gray cast iron. The casting consists essentially of one of the hot exhaust gases permeable inner chamber and an outer chamber designed as a jacket for the flow of cooling water. Such a thing Casting necessarily has fluctuations in wall thickness; a factor that usually occurs in the finished product leads to faults. Furthermore, the material of the castings is often porous. Also is the production of the castings relatively laborious and time-consuming and thus costly, with the cost side also being due to a high reject rate is heavily burdened, which is due to the errors indicated above.

909828/0547

It is the object of the invention to provide an improved water-jacket exhaust pipe and method "for it To create manufacture, whereby the disadvantages mentioned above avoided and at the same time advantages such as extension the service life and reduction of the total weight can be achieved.

To solve this problem, the invention creates a water jacket exhaust line for an internal combustion engine, which is characterized by a hollow inner core serving as an exhaust chamber and one around the inner core arranged and sealing on this adjacent, serving as a cooling water chamber jacket, wholly or in the consists essentially entirely of plastic or of a material that contains synthetic resin as a binder.

The inner core can expediently be made of cast iron, while the jacket is made of a single plastic or can consist of a mixture of different plastics. According to a preferred embodiment, the jacket is reinforced with a filler material, or it consists of one Fiber material with synthetic resin as a binder, such as resin-bonded glass wool.

At least at the points of contact between core and Considerable temperatures occur in the jacket, with particularly high local temperatures at the confluence of the Exhaust ducts in the core as well as in the immediate vicinity the same are to be determined. Therefore, it is preferred to use a synthetic resin binder which is in the

8.28 / 0547

-3- H76598

essentially made of a tiller mixture of polyester and Epoxy resin is made of materials that can withstand such temperatures.

Inlet and outlet openings can easily be provided in the dumbbell, and it is possible to have threads to be molded in the plastic material or threaded insert of metal or other material to be incorporated during the molding process.

Exhaust gas can be produced by the protruding bands of the core, e.g. when shaping it, be provided with an external thread. Any blind ends of the core can in a known manner with a jacket head or in any other suitable manner.

According to a preferred embodiment, the jacket is in the form of several files assembled to form a whole produced, for example, from two halves separated in a central longitudinal plane, which at their abutting one another Surfaces with the same or another suitable material, e.g. a binding agent, are connected to one another in this way or are cemented together so that a stable and completely watertight joint is formed.

According to the invention. Is a method of manufacture a water jacket exhaust pipe for internal combustion engines characterized in that initially a hollow inner core serving as an exhaust chamber is provided and parts thereon one entirely or essentially entirely made of plastic or containing a synthetic resin as a binder

909828/0547 _{tM / slM} . _l

BATH ORIGINAL

Material existing shell are formed, the parts then sealingly adjacent to the core these are arranged around and finally sealingly connected to one another to form a cooling water chamber form.

The two parts of the mantle are expediently complementary halves, which by separating the mantle along a central longitudinal plane are formed.

The coat can initially by the hand lay-on (contact) method known in the art or by the Premix (DMG) molding processes are produced. One of these methods is used to mold the parts around the core and then cemented together.

Before the parts of the jacket are arranged around the core, at least the parts are given the outer surface of the core, which are exposed in this after the adaptation of the jacket, an anti-corrosion treatment.

In order to make it easier to achieve a precise fit of the shell parts on the core, the core can be in the form of or be used as part of the mold for making the shell parts.

Threaded openings can be formed in one or more sections of the shell by Mold inserts to be subsequently removed during molding or permanent threaded inserts in these sections are provided.

In the drawings depicting an embodiment of the

90982Ö / 05A7

To show the object of the invention and to explain the process for producing the same is:

Fig. 1 is a perspective view of the water-jacket exhaust pipe according to the invention in a pulled apart State;

Pig. Figure 2 is a side view of the water jacket exhaust pipe;

Figure 3 is a top plan view of the assembled water jacket exhaust pipe and

FIG. 4 is a cross section along the line IV-IV of FIG.

The exhaust pipe according to the invention is with as a core a water jacket arranged around it. The core 1 is aue according to a known method a suitable cast metal, such as gray cast iron, with the required channels 2, fastening lugs 3, Bolt holes'4 and threads 5 cast. The part of Outer surface of the core 1, which is in contact with the cooling water during use and thus the corrosion, and Although particularly exposed to salt water corrosion, one of those known in the art becomes resistant to corrosion Treated surface protection agent. Since the outer surface of the core 1 is exposed, the treatment can easily under Appropriate control can be carried out to the required depth in the well-defined area, leading to a long-lasting corrosion resistance with simultaneous Saving of the rust preventive used leads. So far, the anti-rust agent also had to act on the

909828/0547

entire inner surface of the jacket are applied, a measure that according to the invention thereby in port case comes that for the production of the jacket naturally corrosion-resistant material is used.

The pressed coat of resin-bonded glass wool consists of two halves 6 and 7 H _f which adapt to the outside of the core 1 accurately. In practice, this can conveniently be achieved in that the core itself is used as part of the mold into which the glass wool is inserted, so that a precise fit of the jacket around the core is ensured. In the jacket 6, 7 there is provided a water inlet port 8 and a water outlet port 9 which have been manufactured using threaded mold inserts which are inserted during molding and then removed again. Of course, metal inserts that remain permanently in the jacket can also be used for this purpose. The two halves 6 and 7 of the jacket are then placed around the core 1 and temporarily held in place by means of clamping devices (not shown) or wrapped bands and then cemented together along their parting surfaces 10 in order to produce a durable, watertight connection between them.

The exhaust line produced in this way has a completely (not only at the connection 8 and 9) sealed Water jackets, with any machine processing for their manufacture and other potential causes of leaks

909828/0547

as they are with all known collecting lines occur, to be avoided.

To achieve the required strong heat rejection the conventional all-metal cast pipes had to have relatively large dimensions so that their weight, due to the heavy material used, was quite high in relation to the heat dissipated. By using of the new improved jacket, the weight of the manifold and thus the total weight of the machine becomes significant which, along with lowering costs, is an important factor when choosing a machine under normal circumstances is where both weight and price are the criteria.

By appropriate selection of the type or mixture of the plastics used according to the different The temperatures of the exhaust gases in the various makes of machinery can be affected by the new exhaust pipe any diesel or gasoline powered Ship engine can be used.

In practice, for example, a polyester resin manufactured by MITCHELL & SMITH, England, and sold under the name "POLYMASTER 552" with a reinforcement made of glass wool, which is known commercially as "Type E ^B glass, is used, where the mixing ratio between synthetic resin and glass wool is 2 1/2: 1 parts by weight The mixture is cured for 12 hours at a temperature of 120 ° C. and then for a further 12 hours at outside air temperature.

909828/0547

Claims (16)

ι 8 "^ -" "■ 1 ^ 76598 patent claims 1. Water jacket exhaust pipe for internal combustion engines, characterized by a hollow inner core (1) serving as an exhaust gas chamber and one arranged around the inner core and sealing against this, serving as a cooling water chamber Sheath (6,7) which consists entirely or essentially entirely of plastic or of a material, contains synthetic resin as a binder. 2. Water jacket exhaust pipe according to claim 1, characterized in that the material of the jacket (6,7) is synthetic resin-bonded glass wool. 3 Water jacket exhaust pipe according to patent claims 1 and 2, characterized in that the binding resin consists of a mixture of polyester and epoxy resin. 4. Water jacket exhaust line according to one of the claims 1 to 3, characterized in that the jacket (6,7) has threaded connections (8,9). 5. Water jacket exhaust line according to one of the claims 1 to 3, characterized in that threaded inserts forming connecting pieces are arranged in the jacket. 6. Water-jacket exhaust line according to one of the preceding Claims, characterized in that the jacket is made of cemented together along their dividing line Sharing consists. 7. Water jacket exhaust pipe according to claim 6, characterized in that the parts are halves formed by division in a central longitudinal plane. 909828/0547 8. A method for the production of water jacket exhaust lines for internal combustion engines, characterized in that that initially a hollow inner core serving as an exhaust chamber is provided and then parts of a whole or in the consisting essentially entirely of plastic or of a material containing synthetic resin as a binder Sheath are formed, the parts are then arranged around the core in a sealing manner and are finally connected to one another in a sealing manner to form a cooling water chamber. 9. The method according to claim 8, characterized in that that the parts are designed as two complementary halves separated along a central longitudinal plane will. 10. The method according to any one of claims 8 and 9, characterized in that the portions of the outer surface of the core which are exposed in the cladding prior to attachment of the jacket around the core are subjected to an anti-corrosion treatment. 11. The method according to any one of claims 8 to 10, characterized in that the parts of the shell with Using the core, the core forms the mold or a part of the mold. 12. The method according to any one of claims 8 to 11, characterized in that threaded nozzles are produced in one or more sections of the jacket, by providing mold inserts therein during the molding process, which are then removed. 909828/0547 13. The method according to any one of claims 8 to 11, characterized in that G-threaded nozzles are provided in one or more sections of the jacket, by constantly in the corresponding Shell parts remaining threaded inserts are arranged in these parts. 14 water jacket exhaust line for internal combustion engines, in particular as described above with reference to the drawings. 15. Process for making water-jacketed exhaust pipes for internal combustion engines, in particular as described in detail above. 16. Water jacket exhaust pipe for internal combustion engines, produced according to the in claims 8 to 13 and 15 claimed method. 909828/0547