DE440157C - Cooling and heat trap device for the exhaust pipes of internal combustion engines - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
January 29, 1927

REICH PATENT OFFICE

PATENT LETTERING

CLASS 46 c ⁴ GROUP

(D ₄₇₉ 88 Ijjffcy

The significant temperatures of the exhaust gases from internal combustion engines, in particular from high-performance gas machines with compressed air purging and recharging and from high-pressure gas machines, prove to be harmful to the exhaust pipes, the more, the better they are insulated. If, however, the insulation is omitted, the temperature of the pipe walls is reduced very much, but the loss of heat, primarily due to radiation, is quite considerable at the high temperatures. The radiated heat is also disadvantageous for the machine and its operation, and unbearable for the operator. Mainly for the latter reasons, it has already been proposed to provide the pipes with water cooling jackets j and to send part of the machine cooling water through. However, such cooling is uneconomical because the Sun 'withdrawal of heat then becomes too large is transformed to the detriment of the waste heat recovery and the extracted high-quality energy in low-value, which is hardly exploitable. For these reasons, the cooling should be carried out in such a way that, firstly, the energy withdrawn from the exhaust gases is not devalued too much, and secondly not too much; Can pass warmth and thirdly ^possible: liehst little loss occurs.

; The present invention is based on this knowledge and is used as a cooling device " Elements designed like superheaters are used, which consist of chambers, tube bundles,

COPY

Claims (2)

Coiled pipes and the like exist that. are surrounded by a gaseous medium or embedded in a mass of limited thermal conductivity, and inside which vapors or liquids of a suitable type and state flow or are evaporated. The amount of heat transferred to the cooling elements mainly by radiation can be kept within very specific and desired limits by the choice of the number of tubes, their arrangement and the speed and temperature of the medium flowing in them; Loss of heat can be prevented by simple insulation without any disadvantages. In contrast to. der-cooling by means of a water jacket or by installing superheater pipes in the exhaust pipe or to the uninsulated pipe, a multiple gradation of the heat gradient between exhaust gas and coolant or exhaust gas and the external environment is used, which makes it easier to control the heat conditions of the entire arrangement and the structural design, the external losses are very limited. The device can be charged with steam or liquid from the waste heat boilers or from the cooling chambers of the internal combustion engines or another source, it can serve as a superheater either alone or with changes! Superheaters connected in parallel or in series. The latter embodiment of the invention as an oil heater must not be confused with the known superheaters, because due to the fact that its main purpose is not one-sided overheating itself, but the cooling of the exhaust pipe while recovering the heat lost by it, it differs from those by the characteristic feature that here the heat transfer to the overheat. The means are not favored in every possible way, but on the contrary are made more difficult and diminished. ! The cooling elements do not need to extend over the entire length of the pipe to the exhaust gas heat exchanger; in most cases only the pipe strings coming from the individual discharge housings will be equipped with them, which will probably reduce the temperature of the exhaust gases to such an extent that the main exhaust pipe is still easy to use. Kanu is clad with insulation material: and yet no longer suffers from excessively high temperatures or loses too much heat. . Of course there is nothing in the. Ways to | application of cooling to the main lines. In the AbI). r and 2 of the drawing shows an embodiment of the invention. Around the exhaust pipe b adjoining the outlet housing α of the machine, there are ring-shaped, divided 6-chambers -c- and tube bundles can be connected next to one another or one behind the other, the chambers themselves can also be subdivided 7 '. The tube bundles are offset from one another so that direct radiation to the outside is not possible. The individual tubes are either surrounded by air or in a mass of They can expand freely by shifting the chambers. A heat protection jacket i 'made of poorly heat-conducting materials is placed around the tube bundle d and chambers c. The division creates the chambers and The tube bundle can be easily removed for cleaning and renewal, and the heat protection jacket can also be split 8f for this purpose the diameter of the cooling device is not too much larger than the pipe diameter. ■ Ρλ τ κ ν τ λ ν s i * K ü c: η ii: 1. "Cooling and heat collection device for the exhaust pipes of internal combustion engines, characterized in that between outlet housings (<?) And 9; exhaust gas heat converters, but in particular behind the outlet housings superheater-like, cooling elements (d) surrounding the exhaust pipe, which are made of gasfönni- 'gen Substances or thermal insulation material surrounding chambers, pipe bundles, coiled pipes or the like. Are formed and are flowed through by vapors or liquids, are arranged so that on the one hand they convey sufficient heat transport to keep the temperature of the pipe wall within permissible limits, but on the other hand a heat loss to the outside as possible. 2. Cooling and heat collection device according to claim τ, characterized in that the same serves as the sole or partial superheater for the steam boiler in the exhaust gas or in the cooling ^{chambers of the \ T} ergcnnungskraftmaschine or for both 1 sheet of drawings. COPY