JP2006002980A - Working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working machine capable of simplifying the refrigerant gas filling operation for air conditioning. <P>SOLUTION: A refrigeration cycle mechanism 21 for air conditioning, is mounted inside of a machine body. Branch pipes 31a, 31b for filling a refrigerant gas, branched from pipes 28a, 28b of the refrigeration cycle mechanism 21 are mounted at the external of the machine body 17. The branch pipes 31a, 31b are placed up to a refrigerant gas filling ports formed on a side face of the machine body 17. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a work machine having a refrigeration cycle mechanism.

  In a cooling device used for cooling an automobile or the like, a three-port valve is interposed in each joint portion of each component device constituting the refrigeration cycle mechanism, and the three-port valve is switched when each component device is replaced. There is one in which the refrigerant gas released into the interior is minimized (see, for example, Patent Document 1).

  The three-port valve is also used when charging and collecting the refrigerant gas, and is connected to a refrigerant charging port of the three-port valve to charge the refrigerant gas.

Similarly, in a construction machine such as a hydraulic excavator, as shown in FIG. 5, refrigerant gas filling ports 5a and 5b are respectively provided in the middle portions of pipes 4a and 4b of a compressor 3 and the like driven by an engine 2 in the airframe 1. Since it is installed, the worker goes up to the cover upper surface 1a of the fuselage 1 and enters the refrigerant gas filling ports 5a and 5b of the pipes 4a and 4b to the hoses 6a and 6b of the commercially available gas charge kit GCK shown in FIG. Quick couplers 7a and 7b, which are connection fittings provided at the tip, are connected to fill the refrigerant gas (Freon R134a) supplied from the hose 8 or the like. The gas charge kit GCK includes pressure gauges 9a and 9b for gas pressure inspection.
JP-A-5-133633 (page 2-3, FIG. 1-3)

  The refrigerant gas filling ports 5a and 5b in the pipes 4a and 4b are not limited to models that are not necessarily in the positions where the gas charge kit GCK can be connected, but also models that are difficult to connect to the gas charge kit GCK. In many cases, the refrigerant gas charging operation is difficult.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a work machine that can easily perform a refrigerant gas charging operation for air conditioning.

  The invention described in claim 1 includes an airframe, a refrigeration cycle mechanism for air conditioning installed inside the airframe, and a branch pipe for refrigerant gas filling branched from the piping of the refrigeration cycle mechanism and disposed outside the airframe. Even if the piping of the refrigeration cycle mechanism for air conditioning is in the back of the fuselage and is difficult to access in the refrigerant gas charging operation, etc., the fuselage is branched from the piping of the refrigeration cycle mechanism If the branch pipe for charging the refrigerant gas disposed outside is used, the refrigerant gas charging operation is facilitated.

  According to a second aspect of the present invention, the branch pipe in the work machine according to the first aspect is provided up to the refrigerant gas filling port set on the side surface of the machine body, and the refrigerant set on the side surface of the machine body The refrigerant gas can be easily charged at the ground level from the gas filling port via the branch pipe for filling the refrigerant gas.

  According to the first aspect of the present invention, even if the piping of the refrigeration cycle mechanism for air conditioning is in the back of the fuselage and is difficult to access in the refrigerant gas charging operation or the like, it is branched from the piping of the refrigeration cycle mechanism. The refrigerant gas charging operation can be facilitated by using the branch pipe for charging the refrigerant gas disposed outside the pipe.

  According to the second aspect of the present invention, the refrigerant gas can be easily charged at the ground level from the refrigerant gas filling port set on the side surface of the machine body via the branch pipe for charging the refrigerant gas.

  Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS.

  FIG. 4 shows a hydraulic excavator as a work machine. An upper swing body 13 is turnably provided on a lower traveling body 11 via a swing bearing section 12, and a power section 14, a cab 15, work, Device 16 etc. are installed. The lower traveling body 11, the upper turning body 13, the power unit 14 and the cab 15 constitute an airframe 17 with respect to the work device 16.

  As shown in FIG. 1, a refrigeration cycle mechanism 21 for air conditioning is installed in the power unit 14 and the cab 15. The refrigeration cycle mechanism 21 includes a compressor 23 driven by an engine 22 in the power unit 14, a condenser 24 of a cooling unit, a liquid receiver 25, an expansion valve 26 included in an air conditioner facility in the cab 15, and It consists of an evaporator 27 and a pipe 28 that connects these refrigeration cycle mechanism constituent devices in an endless manner.

  In such a refrigeration cycle mechanism 21, branch pipes 31a and 31b for charging refrigerant gas are branched out from the branch section 32 as shown in FIG. As shown in FIG. 1, piping is attached along the inner wall surface of the body cover 33 by a pipe tie fitting 34 attached to the inner wall surface of the body cover 33, and the ends of these branch pipes 31 a and 31 b are arranged outside the body body 17. It is installed.

  That is, a plurality of branch pipes 31a and 31b are arranged up to the refrigerant gas filling ports 35a and 35b set on the side surface of the machine body cover 33 as shown in FIG. As shown in FIG. 3 (b), the refrigerant gas filling ports 35 a and 35 b are installed inside a recess 36 formed in the machine body cover 33. A lid plate (not shown) is provided in the recess 36 so as to be freely opened and closed.

  Next, the function and effect of this embodiment will be described.

  The refrigerant gas filling ports 35a and 35b are normally closed by an internal check valve mechanism or the like. However, these quick couplers 7a and 7b, which are connection ports of the commercially available gas charge kit GCK shown in FIG. When the refrigerant gas filling ports 35a and 35b are connected to each other, the refrigerant gas filling ports 35a and 35b are opened, so that the refrigerant gas is filled into the refrigeration cycle mechanism 21 through the gas charge kit GCK and the branch pipes 31a and 31b.

  At this time, if the inside of the refrigeration cycle mechanism 21 is once evacuated by a vacuum pump and then the refrigerant gas is injected into the refrigeration cycle mechanism 21, the refrigerant gas can be efficiently filled into the refrigeration cycle mechanism 21.

  In this way, even if the pipes 28a and 28b of the refrigeration cycle mechanism 21 are in the back of the machine body 17 and are difficult to access in the refrigerant gas charging operation or the like, the machine body is branched from the pipes 28a and 28b of the refrigeration cycle mechanism 21. When the branch pipes 31a and 31b for refrigerant gas filling disposed outside the 17 are used, the refrigerant gas filling operation becomes easy.

  That is, the refrigerant gas is easily filled into the refrigeration cycle mechanism 21 in the fuselage 17 from the refrigerant gas filling ports 35a and 35b set on the side surface of the fuselage cover 33 via the branch pipes 31a and 31b for filling the refrigerant gas. Can be operated.

  In particular, as shown in FIG. 3, when the refrigerant gas filling ports 35 a and 35 b are provided on the side surface of the machine body cover 33, the worker does not need to go up to the upper surface of the machine body cover 33, and an easy refrigerant at the ground level Gas filling becomes possible. Further, by using these refrigerant gas filling ports 35a and 35b, it is possible to easily perform a gas pressure test using the pressure gauges 9a and 9b (FIG. 6) of the gas charge kit GCK.

It is the perspective view and circuit diagram which show one Embodiment of the refrigerating-cycle mechanism installed in the body of the working machine which concerns on this invention. It is a side view of piping used for the refrigerating cycle mechanism of a working machine same as the above, and branch piping branched from this piping. (A) is the perspective view which shows the body of the working machine same as the above, (b) is the perspective view which expanded and showed the refrigerant gas filling port. It is a side view of a working machine same as the above. It is a perspective view which shows the body of the conventional working machine. It is a front view of the gas charge kit which fills the refrigerant gas for air conditioning.

Explanation of symbols

17 Aircraft
21 Refrigeration cycle mechanism
28a, 28b piping
31a, 31b Branch piping
35a, 35b Refrigerant gas filling port

Claims (2)

The aircraft,
A refrigeration cycle mechanism for air conditioning installed inside the aircraft,
A working machine comprising: a branch pipe for charging refrigerant gas that is branched from a pipe of the refrigeration cycle mechanism and disposed outside the machine body. The work machine according to claim 1, wherein the branch pipe is disposed up to a refrigerant gas filling port set on a side surface of the machine body.

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