JP2012144190A - Outside air introduction device of air conditioner for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent intrusion of such as dust to the inside of the air conditioner in which a prefilter and a main filter are surely held even if the vibration etc. are generated while making space saving of the installation space in an outside air introduction device of the air conditioner for the working machine.SOLUTION: The outside air introduction device 12 of the air conditioner for the working machine includes: a prefilter package 10 that is disposed to an outer wall neighborhood of the cab and provided by packaging the prefilter 5 that filters the coarse dust contained in the outside air; and a filter 3 that is disposed to the back side of the prefilter package and filters the dust finer than the coarse dust that the prefilter filters. The prefilter package includes: a prefilter fixing plate 10a; a seal member 10b disposed to the front side surrounding part of the prefilter fixing plate; the prefilter that touches the seal member; and a plate 10c disposed to the front side of the prefilter.

Description

  The present invention relates to an outside air introduction device for an air conditioner mounted on a work machine, and more particularly to an outside air introduction device for an air conditioner suitable for a construction machine.

  An example of a railcar air filter having a prefilter and a filter is described in Patent Document 1. The air filter described in this publication has a casing, a pleated processed non-woven fabric part, and a filter part, in order to withstand exchange and use several times, to have a long service life and to be easily exchanged with vibration. And a sheet-like prefilter disposed on the front surface of the sheet. The filter part is attached to the inside of the casing in pressure contact with the elasticity of the filter part.

  An example of an air cleaner having a prefilter and a filter is described in Patent Document 2. The air cleaner described in this publication accommodates and holds a folded main filter, and an element having a pre-filter made of a non-woven fabric having a high porosity and disposed upstream of the main filter and a resin frame. . The frame is formed with a locking projection for attaching the pre-filter. The locking projection is formed on the shaft portion penetrating the pre-filter and on the tip side of the shaft portion, and is located on the upstream side of the pre-filter. And a large tip diameter portion for fixing the prefilter.

JP 2004-51037 A Japanese Patent Laid-Open No. 10-85539

  Since the air filter described in Patent Document 1 is for intake of railway vehicles, the ease of filter replacement is an important issue. For this reason, the filter portion made of non-woven fabric is attached to the frame-shaped casing that holds the filter portion by being pressed by the elastic force of the filter portion. As a result, if a large vibration occurs, the elastic restoring force of the filter part may be lost against the force that compresses the filter part due to the excitation force, and a slight gap may occur between the casing frame and the filter part. is there. Because it is for railway vehicles, it is unlikely that large vibrations will occur, and because the driving environment does not travel in the presence of dust or dust, dust from this slight gap will enter the interior. Is not considered.

  On the other hand, the working machine targeted by the present invention is typically a construction machine, and there may be a great deal of dust and dust generated in the work environment. When a filter such as that described in Patent Document 1 is used in a working machine, it is difficult to maintain the filter part without a gap only by the elastic force of the filter part. At the same time, it is difficult to hold the filter itself in the apparatus.

  Moreover, in the element for air cleaners described in Patent Document 2, in order to fix and arrange the prefilter on the front surface of the main filter, a plurality of locking members are projected from the main filter to the prefilter side. However, the element described in Patent Document 2 has a special shape, and the production cost of the element increases in a work machine for semi-line production. In addition, a space in the flow direction for fixing the prefilter is required. On the other hand, in the case of the working machine targeted by the present invention, there is only a small space around the cab, and it is possible to arrange an outside air introducing device having a prefilter as described in Patent Document 2. ,Have difficulty.

  The present invention has been made in view of the above-described problems of the prior art, and the object thereof is to reduce the installation space in the outside air introduction device for the working machine air conditioner, even if vibration or the like occurs, and the prefilter and The main filter is securely held to prevent dust and the like from entering the air conditioner. Another object of the present invention is to facilitate replacement of a prefilter and a main filter while preventing intrusion of dust and the like into the air conditioner in an outside air introducing device for an air conditioner for a work machine.

  A feature of the present invention that achieves the above-described object is that, in an outside air introduction device for an air conditioner for a work machine that guides outside air to an air conditioner body that is arranged in a cab of the work machine, the rough air that is disposed near the outer wall of the cab and is included in the outside air. A pre-filter package in which a pre-filter for filtering dust is packaged, and a filter that is disposed on the back side of the pre-filter package and filters fine dust than coarse dust filtered by the pre-filter.

  In this feature, the pre-filter package includes a pre-filter fixing sheet metal plate that is in contact with the outer edge of the filter and has an opening at the center, and a seal member disposed around the front side of the pre-filter fixing sheet metal plate. And a pre-filter that contacts the seal member and a plate that is disposed on the front side of the pre-filter and that has an opening at the center thereof is preferably fixed with screws.

  Furthermore, the outside air introduction device is provided with an air conditioner duct for guiding outside air to the air conditioner body, and a pre-filter package is preferably detachably attached to the air conditioner duct, and the tip of the air conditioner duct is located on the outer wall of the cab. It is preferable to engage with a shoe strip provided on the back of an openable / closable cover that constitutes a part of the cover, and to open / close the prefilter package by opening the cover.

  According to the present invention, in the outside air introduction device for the work machine air conditioner, the presser plate is disposed on the front surface of the prefilter, and the presser plate is detachably screwed to press the prefilter. Even if vibration or the like occurs while saving space, the pre-filter and the main filter are securely held, and dust and the like can be prevented from entering the air conditioner. Further, the prefilter and the main filter can be easily replaced while preventing dust and the like from entering the air conditioner.

It is a disassembled perspective view of the principal part of one Example of the external air introduction apparatus which concerns on this invention. It is a figure explaining attachment of the pre filter in the outside air introducing device shown in FIG. It is a side view of one Example of the working machine which concerns on this invention. It is a figure explaining the external air introduction path | route of the working machine shown in FIG. It is a perspective view of the conditioned air blowing part in the cab with which the working machine shown in FIG. 3 is provided.

  Hereinafter, an embodiment of an outside air introduction device 12 for an air conditioner for a working machine according to the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of an embodiment of an air conditioner according to the present invention, and is a view mainly showing a portion of an outside air introducing device 12 which is a main part thereof. FIG. 2 is a view for explaining a mounting state of the outside air introduction device 12 shown in FIG. 1, and shows the outside air introduction device 12 in a perspective view. FIG. 3 is a side view of a wheel loader that is a type of the work machine 20, FIG. 4 is an introduction path of outside air to the work machine 20, and FIG. 5 is an air conditioner arranged in a cab included in the work machine. It is a figure which shows a main body and an air-conditioning air blowing part.

  In the wheel loader 20, as shown in FIG. 3, a cab 30 on which an operator rides is provided on the front end side, a rear vehicle body 35 having a rear wheel (wheel) 31 R provided in a lower portion, and a front side of the rear vehicle body 35. A vehicle body 33 is constituted by a front vehicle body 34 that is swingably connected to the left and right and is provided with a front wheel (wheel) 31F at the bottom. Behind the cab of the rear body 35, the engine 32, a plurality of hydraulic pumps (not shown), and the like are housed and arranged in the bonnet.

  Between the rear vehicle body 35 and the front vehicle body 34, there is provided a pair of swing cylinders (not shown) that swing the front vehicle body 34 in the left-right direction with respect to the rear vehicle body 35. Thereby, the worker can steer the traveling direction by swinging the front wheels 31F and 31R while traveling the vehicle body 33 in the front-rear direction.

  A work device 29 is mounted on the work machine 20 so as to be able to move up and down in the vertical direction. In the working device 29, the bucket 28 is attached to the distal end portion of the arm 25 whose base end side is attached to the front vehicle body 34 so as to be able to move up and down. The bucket 28 is also rotatably connected to one end portion of the link 24, and the other end portion of the link 24 is rotatably connected to the bell crank 23. An end of the bell crank 23 is connected to the bucket cylinder 22 so as to be rotatable. The arm 25 is connected to the arm cylinder 21 at its intermediate portion.

  In the working device 29 formed in this way, the arm 25 moves in the vertical direction due to the expansion and contraction of the arm cylinder 21, and the bucket moves in a cloud (upward rotation) or dump (downward rotation) operation by the expansion and contraction of the bucket cylinder 22. I do. For example, it is possible to excavate debris or the like that is an object to be excavated and load it on a loading platform such as a truck.

  In the work machine 20, a driver's seat, an operation lever device, and an air conditioner unit are provided inside the cab 30 (not shown). The air conditioner unit is located behind the driver's seat, and includes an air conditioner main body 1 that houses an evaporator for cooling, a heater core for heating, and the like, a blower 1a that blows air to the air conditioner main body 1, and a fan It has an air conditioner duct 2 connected to the suction side and described in detail later.

  In addition, an outside air introduction device 10 is provided behind the door 36 for an operator to get into the cab 30 and below the outer wall of the cab 30 to take in air for air conditioning the cab 30 into the air conditioner unit. . Details of the surroundings of the outside air introduction device 10 are shown in FIG. 4 is an enlarged view of a portion A in FIG. 3 (FIG. 4 (a)) and a cross-sectional view taken along the line BB (FIG. 4 (b)).

  As shown in FIG. 4A, the cover 41 that forms the outer wall of the cab 30 and can be opened and closed around the hinge 46 is formed with a plurality of louvers 43 that run in the horizontal direction. A cover opening / closing knob 45 is provided on the opposite side of the hinge 46 across the louver 43. As shown in FIG. 4B, the louver 43 has a shape that is bent downward, and prevents raindrops 44 and dust from entering the cab 30.

  The cover 41 covers an opening formed in the cab outer wall 7, and a shoe strip 6 provided in the vicinity of the outer peripheral portion on the back side is fitted with a distal end portion of an outside air introduction device 12, which will be described in detail later, so that an airtight portion is formed. Form. In order to prevent intrusion into the air conditioner main body 1 such as dust contained in the outside air led from the outside air inlet 42 formed between the louvers 43 over almost the entire back side of the cover, the baffle plate 47 is used. Are arranged with a slight gap from the surface of the louver 43.

  The outside air introduction device 12 includes an air conditioner duct 2 connected to the air conditioner body 1 and a filter 3 attached to the air conditioner duct 2. A fixing plate 10a is disposed on the outside air inlet 42 side, which is the front side of the filter 3, and the filter 3 is fixed to the attachment member 8 with a thumbscrew 4c. The distal end side of the attachment member 8 is fitted to the shoe strip 6.

  FIG. 5 shows an air conditioning piping system inside the cab 30. The outside air is guided from the filter 3 to the air conditioner body 1 through the outside air introduction duct. The air conditioner main body has a blower 1a, and takes in air from the cab 30 through the intake 52 and takes in outside air. A part of the air conditioned by the air conditioner body is blown out from the foot outlet 53 adjacent to the air conditioner body 1 to the feet of the operator in the cab 30.

  Further, a part of the air-conditioned air is also guided to the rear blowing duct 54 provided adjacent to the foot blowing port 53, and from the rear blowing ports 55a and 55b provided at the tip of the rear blowing duct 54. Air-conditioned air is blown out to the back side of the operator of the work machine 20. Further, in order to guide the conditioned air from the rear blowing duct 54 to the front of the operator, a front blowing rising duct 56 is provided in the vicinity of the operation unit of the work machine 20. Are provided with front outlets 57a to 57c for blowing out conditioned air to the operator.

  In the air conditioning system of the working machine 20 configured as described above, the details of the filter unit that prevents intrusion of dust and raindrops into the cab 30, which is a feature of the present invention, will be described with reference to FIGS. FIG. 1 is an exploded perspective view of the main part of one embodiment of the outside air introducing device 12 according to the present invention (FIG. 1A) and a view taken along the line BB in FIG. 1A (FIG. 1B). It is a figure of a pre filter part and a filter part. 2A and 2B are diagrams for explaining the attachment of the pre-filter 5 in the outside air introduction device 12 shown in FIG. 1. FIG. 2A is a view before the pre-filter package 10 is assembled, and FIG. It is the figure which removed the cover 41 of the cab outer wall 7 after attaching the filter package 10 to the duct 2 for air conditioners.

  An air conditioner duct 2 is hermetically connected to the air conditioner main body 1, and the filter 3 is accommodated on the front side (the outside air inlet 42 side) of the air conditioner duct 2. In this embodiment, the filter 3 abuts the prefilter fixing sheet metal plate 10a included in the prefilter package 10 on the front side. And the screw member which formed the some through-hole 4d in one side of the long side of the opening part 4q formed in this pre filter fixed sheet metal plate 10a, let the thumbscrew 4c pass, and was attached inside the duct 2 for air conditioners The filter 3 is held in the air conditioner duct 2 by being engaged with the 4p screw hole 4f.

  By the way, in the present invention, in addition to the filter 3, the pre-filter 5 is also attached to prevent dust and the like from entering the cab 30 and to change the inspection cycle of the pre-filter 5 and the inspection cycle of the filter 3. A relatively large foreign object (coarse dust) can be easily taken out. Therefore, the prefilter is packaged so that the prefilter 5 can be easily replaced, inspected, and taken out. The prefilter package 10 will be described below.

  The external shape of the pre-filter fixing sheet metal plate 10a is the same as before so that the filter 3 can be attached to the duct 2 for an air conditioner by the same method as before. That is, the shape of the opening 4q of the prefilter, the outer peripheral shape, the thickness, and the like are the same as in the past. However, in order to fix the pre-filter 5, two L-shaped upper members 4j with nut-shaped members 4d attached to the upper side of the pre-filter fixing sheet metal plate 10a are attached with a slight gap in the width direction. . Further, a U-shaped member 4k whose end in the width direction is bent upward is attached to the lower side of the prefilter fixing sheet metal plate 10a. A plurality of nut-shaped members 4e are attached to an intermediate portion in the width direction of the U-shaped member 4k, and the screw 4b can be screwed from below.

  The seal member 10b is attached so as to surround the opening 4q on the front side of the prefilter fixing sheet metal plate 10a. The seal member 10b is made of a resin such as urethane or sponge that is easily elastically deformed. FIG. 1B shows a state in which the seal member 10b is attached. FIG. 1B shows a state in which the thumbscrew 4c is inserted.

  The prefilter 5 is disposed on the front surface side of the prefilter fixing sheet metal plate 10a in contact with the seal member 10b. As a matter of course, the prefilter 5 is made of a coarser material than the filter 3. A projection 4n is formed at the center of the upper side of the prefilter 5 to position the prefilter, and this projection is formed between two L-shaped members 4j attached to the prefilter fixing sheet metal plate 10a. Fits into the gap.

  On the front surface of the pre-filter 5, a frame-shaped plate 10c having an opening 4r formed at the center is disposed. A plurality of through holes 4g are formed on the upper side of the frame-shaped plate 10c. The prefilter 5 is airtightly fixed by inserting the screw 4a into the through hole 4g and screwing it into the nut-shaped member 4d attached to the prefilter fixing sheet metal plate 10a.

  The lower side of the plate 10c is bent to the back side, and screws 4b are inserted into a plurality of through holes 4h formed in the bent part 4m, and screwed into a nut-like member 4e attached to the lower side of the prefilter fixing sheet metal plate 10a. Thus, the pre-filter 5 is positioned in the vertical direction. By screwing the screws 4a and 4b, a thin prefilter package 10 is formed by the plate 10c and the prefilter 5, the seal member 10b, and the prefilter fixing sheet metal plate 10a. Thus, since the prefilter package 10 can be made thin, it is possible to guide the outside air to the air conditioner body 1 even in a state where only a small space can be obtained between the cab outer wall 7.

  A procedure for assembling the filter unit using the pre-filter package 10 configured as described above will be described with reference to FIG. 2A shows a state before the pre-filter package 10 is fixed, and FIG. 2B shows a state after the fixing. The filter 3 is inserted into the air conditioner duct 2 using an inclined portion on the back side. The pre-filter fixing sheet metal plate 10a is brought into contact with the attachment member 8, and the pre-filter package 10 is fixed to the air conditioner duct 2 using the thumbscrew 4c.

  At the time of maintenance, as shown in FIG. 2 (b), the prefilter package 10 can be easily taken out simply by opening the cover 41 of the cab outer wall 7 and removing the thumbscrew 4c. Normally, this is sufficient, but if the dirt is severe, the filter 3 is further removed. At that time, since the filter 3 is not fixed to the air-conditioner duct 2, it can be easily pulled forward. The prefilter package 10 and the baffle plate 47 need only have a gap of several tens of millimeters through which the outside air can circulate, and even if the prefilter 5 is provided, an increase in the size of the outside air introduction device can be avoided.

  In the above embodiment, the wheel loader is taken up as a work machine, but the work machine is not limited to this, and may be a bulldozer or a hydraulic excavator. If the working machine is used in an environment where dust is likely to be generated and air-conditions by taking in outside air, the entry of dust into the cab can be greatly reduced. Further, the cover of the cab outer wall is removed for easy explanation, but the above operation can be performed only by opening the cover of the cab outer wall.

  DESCRIPTION OF SYMBOLS 1 ... Air conditioner main body, 2 ... Air-conditioner duct, 3 ... Filter, 4a, 4b ... Screw, 4c ... Thumb screw, 4d, 4e ... Nut-like member, 4f ... Screw hole, 4g, 4h ... Through hole, 4j ... L-shaped member, 4k ... U-shaped member, 4m ... Bending part, 4n ... Projection, 4p ... Screw-like member, 4q, 4r ... Opening (part), 5 ... Prefilter, 6 ... Shoe strip, 7 ... Cab Outer wall, 8 ... Mounting member, 10 ... Prefilter package, 10a ... Prefilter fixing sheet metal plate, 10b ... Seal member, 10c ... Plate, 12 ... Outside air introduction device, 20 ... Working machine (wheel loader), 21 ... Arm cylinder, 22 ... Bucket cylinder, 23 ... Bell crank, 24 ... Link, 25 ... Arm, 28 ... Bucket, 29 ... Working device, 30 ... Cab, 31F, 31R ... Wheel, 32 ... Engine, 33 Car body 34 ... Front car body 35 ... Rear car body 36 ... Door 41 ... Cover 42 ... Outside air intake 43 ... Louver 44 ... Raindrop 45 ... Door knob 46 ... Hinge 47 ... Baffle plate 51 ... Floor surface 52 ... Inside air intake, 53 ... Foot outlet, 54 ... Rear outlet duct, 55a, 55b ... Rear outlet, 56 ... Front outlet rise duct, 57a, 57b, 57c ... Front outlet.

Claims (4)

  In the outside air introduction device for the working machine air conditioner that guides the outside air to the air conditioner main body arranged in the cab of the working machine, a pre-filter that filters the coarse dust contained in the outside air that is arranged near the outer wall of the cab is packaged. An outside air introduction device for an air conditioner for a work machine, comprising: a prefilter package; and a filter that is disposed on a back surface side of the prefilter package and filters finer dust than coarse dust filtered by the prefilter.   The pre-filter package includes a pre-filter fixing sheet metal plate that is in contact with an outer edge of the filter and has an opening formed in a central portion thereof, a seal member that is disposed around the front side of the pre-filter fixing sheet metal plate, 2. The operation according to claim 1, wherein the prefilter that abuts on the sealing member and a plate that is disposed on the front side of the prefilter and that has an opening at the center are fixed with screws. Outside air introduction device for air conditioners for aircraft.   3. The working machine according to claim 2, wherein the outside air introduction device includes an air conditioner duct for guiding outside air to the air conditioner body, and the prefilter package is detachably attached to the air conditioner duct. Air conditioner outside air introduction device.   A front end of the air conditioner duct is engaged with a shoe strip provided on the back of an openable / closable cover that forms a part of the outer wall of the cab, and the prefilter package is attached / detached by opening the cover. The outside air introducing device for an air conditioner for a working machine according to claim 3, characterized in that:

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