Heat insulation structure of construction machine

Abstract

The invention provides a heat insulation structure for a construction machinery capable of increasing operability and safety while in checking and maintenance. The construction machinery comprises: an engine room (19) for containing an engine (20) to supply power; an upper cover (19f) for covering a part of an upper surface of the engine room (19) in a freely open / close manner; an upper surface cover (19d) for covering a rest of the upper surface of the engine room (19); and a supercharger (26) disposed on an upper section of the engine room (19) and driven by exhaust gas from the engine (20)for supercharging the engine (20). In the engine room (19), a support part (36) is provided in such a way that it covers an upper portion of at least a turbine part (26a) of the supercharger (26) andsupports an upper surface cover part (19h) as a passage from below. Thereby, during checking and maintaining, an operator will never mind a part of the body, e.g., hand or wrist and the like error contacting with the supercharger (26), thus operation can be performed effectively in a short time, and the safety is improved.

Description

technical field [0001] The present invention relates to a thermal insulation structure of a construction machine having a supercharger for supercharging an engine. Background technique [0002] A conventional construction machine such as a hydraulic excavator is equipped with a supercharger (turbocharger) that increases engine performance by supercharging the engine. [0003] The supercharger has a structure in which a turbine and an impeller are arranged coaxially, and the turbine is rotated at a high speed by exhaust gas discharged from the engine, and the impeller is driven by the turbine, thereby supercharging the engine. [0004] In addition, since the existing supercharger uses the energy of the exhaust gas immediately after being discharged from the engine to rotate the turbine at high speed, the supercharger can be directly mounted on the exhaust manifold of the engine. [0005] Therefore, when the engine is running, high temperatures are generated especially near t...

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Problems solved by technology

[0010] However, as in the heat insulating device described in the above-mentioned Patent Document 1, the heat insulating plate is directly attached to the support plate protruding from the cylinder head and the exhaust pipe, and since the heat of the engine and the exhaust pipe is transferred to the heat insulating plate, Therefore, the temperature of the heat shield itself tends to increase

[0011] Therefore, when the heat insulating device described in the above-mentioned Patent Document 1 is applied to a supercharger of a construction machine, there is a problem of mistaken contact with a high-temperature heat insulating plate during inspection and maintenance around the engine.

[0012] On the other hand, the heat insulating device described in Patent Document 2 does not directly contact the supercharger because the heat insulating structure covers the entire supercharger. The surface temperature of the heat shield increases, so when inspection and maintenance around the engine are performed, there is a problem of accidentally touching the surface of the heat insulation structure.

[0013] In addition, since the heat shield covers the entire supercharger, heat from the turbine side tends to fill the heat insulating structure. As a result, the temperature of the supercharged intake air becomes higher and the efficiency of intake air filling decreases, and the load on the intercooler increases. , so there are problems such as the need to increase the capacity of the intercooler

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