AN ENGINE BLOCK WHICH PROTECTS FUEL INJECTOR AGAINST CORROSION TECHNICAL FIELD

The present invention relates to fuel injectors used for spraying fuel into the combustion chamber in internal combustion engines, and relates to engine blocks whereon said injectors are placed.

PRIOR ART

Fuel injectors in general provide spraying fuel with desired intervals into the combustion chamber in internal combustion engines.

The fuel, which passes in a controlled manner through the valve region defined inside fuel injectors, passes through the spray pipe extending inside the engine block, and it arrives at the spray tip opened to the combustion chamber provided in the engine, and it is sprayed into the combustion chamber. The acidic gases, formed as a result of the explosions which occur in the combustion chamber, enter between the spray pipe and the engine block, and they lead to corrosion outside of the spray pipe, in other words, they lead to corrosion in the fuel injector.

As a result, because of all of the abovementioned problems, an improvement is required in the related technical field.

BRIEF DESCRIPTION OF THE INVENTION

The present invention relates to an engine block, for eliminating the above mentioned disadvantages and for bringing new advantages to the related technical field.

The main object of the present invention is to provide an engine block where corrosion between the spray pipe of the fuel injector and the engine block is prevented. In order to realize all of the abovementioned objects and the objects which are to be deducted from the detailed description below, the present invention relates to an engine block where a fuel injector having at least one spray pipe is fixed, in order to be used for providing spraying of fuel into the combustion chamber in a controlled manner in internal combustion engines. Accordingly, said engine block comprises at least one channel wherein hot exhaust gases circulate in order to increase the temperature in the vicinity of said spray pipe. Thus, when desired, hot exhaust gases are transferred into the channel and thus, the periphery of the spray pipe is heated. By means of this, condensation and corrosion formation at the periphery of the spray pipe is prevented.

In a preferred embodiment of the subject matter invention, the channel at least partially surrounds the spray pipe. Thus, the spray pipe is heated along the periphery thereof.

In a preferred embodiment of the subject matter invention, there is at least one temperature sensor connected to the spray pipe.

In a preferred embodiment of the subject matter invention, there is at least one control unit connected to the temperature sensor. Thus, when the temperature around the spray pipe decreases below a pre-calculated value, hot exhaust gases are transferred to the channel. In another embodiment, when the load applied to the motor is reduced, it is expected that the temperature will decrease, and the control unit provides transfer of hot exhaust gases to the channel.

In a preferred embodiment of the subject matter invention, the spray pipe is positioned in an opening provided on the engine block.

BRIEF DESCRIPTION OF THE FIGURES

In Figure 1 , a representative view of the subject matter engine block and of the fuel injector provided on said engine block is given.

REFERENCE NUMBERS

10 Fuel injector

20 Injector body

21 Valve element

22 Spray pipe

23 Spray tip

24 Fuel channel

30 Engine block 31 Opening

32 Combustion chamber

33 Channel

40 Temperature sensor

50 Critical region

60 Control unit

THE DETAILED DESCRIPTION OF THE INVENTION In this detailed description, the subject matter fuel injector (10) is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.

As can be seen in Figure 1 , the subject matter fuel injector (10) comprises an injector body (20) wherein the valve elements (21 ) are positioned. There is at least one spray pipe (22) extending outwardly from said injector body (20). The tip of said spray pipe (22) is defined as a spray tip (23). There is at least one fuel channel (24) extending through the injector body (20) towards the spray tip (23). The fuel, which is transferred to the fuel channel (24) under the control of the valve elements (21 ) inside the injector body (20), advances along the spray pipe (22), and it passes through the spray tip (23), and it exits the fuel injector (10).

In order to provide reaching of the fuel, exiting the fuel injector (10), at the combustion chamber (32) formed inside the engine block (30), the fuel injector (10) is fixed to at least one opening (31 ) provided on the engine block (30). On the engine block (30), there is at least one channel (33) provided in the vicinity of the fuel injector (10). Said channel (33) can at least partially surround the periphery of the fuel injector (10). The channel (33) is connected to the exhaust system (not illustrated in the figures) of the engine. In other words, the hot gases formed after combustion in the combustion chamber (32) can be transferred into the channel (33) when desired. Moreover, there is at least one temperature sensor (40) which measures the temperature of the critical region (50) defined between the spray pipe (22) and the wall of the opening (31 ) provided on the engine block (30). Said temperature sensor (40) transfers the measurement values to a control unit (60).

In said embodiment, the fuel, exiting the spray tip (23), reaches the combustion chamber (32). The gases formed after the explosions occurring in the combustion chamber (32) try to enter into the critical region (50) defined between the engine block (30) and the spray pipe (22). The gases, which enter between the spray pipe (22) and the engine block (30), condense in cases where the engine operates under low load and cools, and said gases may lead to corrosion in the critical region (50). In order to prevent said corrosion, the hot exhaust gases formed in the combustion chamber (32) are transferred into the channels (33), and the periphery of the critical region (50) is heated. Thus, condensation and thereby corrosion are prevented. The control unit (60) can provide transfer of the hot gases into the channel (33) depending on the measured temperature value. In an alternative embodiment, the control unit (60) checks the amount of load applied to the motor, and it can provide transfer of hot exhaust gases to the channel (33) in case of low loads. By means of said embodiment, the critical region (50) is heated without needing additional energy, and thereby corrosion is prevented.

The protection scope of the present invention is set forth in the annexed Claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention.