Work equipment

Abstract

To provide a working machine which is reducible in a size while improving maintenance performance.SOLUTION: Since an intake part 20 is arranged at a side opposite to a cooling fan 60 side so as to sandwich a pair of air tanks 50, the intake part 20 can be separated from a cooling fan 60. By this constitution, a cooling wind W from the cooling fan 60 including much of dust can be made to be difficult to arrive at the intake part 20. Therefore, it is suppressed that the clogging of a filter may early occur, and maintenance performance can be improved. Also, since the intake part 20 is not needed to be installed on a path in which the cooling wind W from the cooling fan 60 flows, it is not necessary to secure a space for the intake part 20 around the cooling fan 60. A size of an air compressor 10 can be thereby reduced as a whole.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a work machine that takes in and compresses gas and supplies the compressed gas to an external device. [Background technology]

[0002] An example of a work machine that takes in and compresses gas and supplies the compressed gas to an external device is described in Patent Document 1. The work machine (gas compressor) described in Patent Document 1 includes an intake pipe that takes in gas, a compression unit that compresses the gas, an air tank that stores the compressed gas, an electric motor that drives the compression unit, and a cooling fan that cools the compression unit, the electric motor, etc.

[0003] A filter is provided on the intake port side of the intake pipe to capture dust contained in the gas flowing into the intake pipe. More specifically, the filter is placed on the path along which the cooling air from the cooling fan flows, and the cooling air passes through the filter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-071467 Summary of the Invention [Problem to be solved by the invention]

[0005] In the technology described in Patent Document 1, the cooling air from the cooling fan passes through a filter. The external gas sucked into the cooling fan contains a lot of dust, which can cause the filter to clog quickly. This has led to the need for frequent filter maintenance to prevent a decrease in air intake efficiency.

[0006] Additionally, it became necessary to review the layout of the filters, including the layout of the intake pipes, in order to reduce the size of the entire work machine.

[0007] An object of the present invention is to provide a work machine that can be made smaller while improving ease of maintenance. [Means for solving the problem]

[0008] In one aspect of the present invention, the compressor comprises an intake section that draws in gas, a compression section that compresses and discharges the gas drawn in from the intake section, a tank section into which the gas discharged from the compression section flows, and a cooling fan that sends cooling air to the compression section, and the intake section is positioned on the opposite side of the tank section from the cooling fan.

[0009] In another aspect of the present invention, the cooling fan is disposed above the tank portion, and the intake portion is disposed below the tank portion.

[0010] In another aspect of the present invention, the tank portion has a protrusion at the middle portion of the tank portion in the vertical direction that protrudes further in a first direction that intersects with the vertical direction than the upper and lower portions of the tank portion, and the intake portion is arranged below the protrusion.

[0011] In another aspect of the present invention, a plurality of the tank portions are arranged side by side in the first direction, and the intake portion is disposed between the tank portions in the first direction.

[0012] In another aspect of the present invention, the arrangement range of the intake section in the first direction at least partially overlaps with the tank section when the intake section is viewed from the top-bottom direction.

[0013] In another aspect of the present invention, the intake section comprises a flat portion having a flat shape extending in the first direction and an extension portion extending upward from the flat portion, and the flat portion overlaps with the protrusion portion when the flat portion is viewed from the top-bottom direction.

[0014] In another aspect of the present invention, when a direction intersecting both the vertical direction and the first direction is defined as a second direction, the placement range of the intake section in the second direction at least partially overlaps with the tank section when the intake section is viewed from the vertical direction.

[0015] In another aspect of the present invention, the tank portion is formed in a cylindrical shape extending in the second direction.

[0016] In another aspect of the present invention, the fuel cell device has legs extending downward from the tank portion, and the intake portion is positioned above a lower end portion of the legs.

[0017] In another aspect of the present invention, the cooling fan is an axial flow fan.

[0018] In another aspect of the present invention, the intake section comprises an intake section case, an intake passage connecting the intake section case and the compression section, an intake port connecting the inside and outside of the intake section case, and a filter section housed in the intake section case and collecting dust contained in the gas flowing from the intake port to the intake passage.

[0019] In another aspect of the present invention, the intake port is provided on the side of the intake case opposite to the cooling fan side.

[0020] In another aspect of the present invention, the intake unit case has an inlet portion in which the intake port is provided, and an outlet portion that connects the intake passage and the inlet portion and has a flow path cross-sectional area larger than that of the intake passage and smaller than that of the inlet portion, and the filter unit is housed in the inlet portion and covers the outlet portion.

[0021] In another aspect of the present invention, the intake case has a rib protruding from the inner wall of the inlet section toward the filter section, and the rib is arranged to surround the outer edge of the connection between the inlet section and the outlet section. [Effects of the Invention]

[0022] According to the present invention, the intake section is located on the opposite side of the tank section from the cooling fan, so that the intake section can be located away from the cooling fan, making it difficult for the cooling air from the cooling fan containing a lot of dust to reach the intake section.

[0023] Therefore, early clogging of the filter is suppressed, and maintenance can be improved.

[0024] Furthermore, since there is no need to provide an intake section on the path along which the cooling air flows from the cooling fan, there is no need to secure space for an intake section around the cooling fan.

[0025] Therefore, it is possible to reduce the overall size of the work machine. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a partial cross-sectional view of an air compressor (without a body cover) viewed from above. [Figure 2] FIG. 2 is a view taken along the arrow A in FIG. [Figure 3] FIG. 3 is a view corresponding to FIG. 2 and showing a state in which the body cover is attached. [Figure 4] 4A and 4B are views (three types) taken along arrow B in FIG. 3. [Figure 5] 4 is a cross-sectional view of a portion of the air tank taken along line CC in FIG. 3. [Figure 6] FIG. 4 is a cross-sectional view of a portion of the air tank taken along line DD in FIG. 3. [Figure 7] FIG. 7 is an enlarged view of a portion E circled by a dashed line in FIG. 6. [Figure 8] FIG. 2 is a perspective view illustrating the details (front and back) of the filter cover. [Figure 9] 7 is an enlarged view corresponding to FIG. 6, illustrating the procedure for attaching the filter. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0028] Figure 1 is a partial cross-sectional view of the air compressor (without body cover) seen from above, Figure 2 is a view taken from the arrow A in Figure 1, Figure 3 is a view corresponding to Figure 2 showing the state with the body cover attached, Figure 4 is a view taken from the arrow B in Figure 3 (three types), Figure 5 is a cross-sectional view of the air tank portion along line CC in Figure 3, Figure 6 is a cross-sectional view of the air tank portion along line DD in Figure 3, Figure 7 is an enlarged view of the dashed circle E in Figure 6, Figure 8 is an oblique view explaining the details (front and back) of the filter cover, and Figure 9 is an enlarged view corresponding to Figure 6 explaining the procedure for installing the filter.

[0029] <Air Compressor Overview> 1 to 3 is a portable air compressor used at construction sites, etc. The air compressor 10 is provided with a handle 11, and an operator can grasp the handle 11 and lift the air compressor 10, thereby moving the air compressor 10 onto any installation surface SF.

[0030] The air compressor 10 comprises an intake section 20 that draws in external gas (air at atmospheric pressure), a first compression section 30 on the low-pressure side and a second compression section 40 on the high-pressure side that compress and discharge the gas drawn in from the intake section 20, a pair of air tanks 50 into which gas (compressed air) discharged from the second compression section 40 on the high-pressure side flows, and a cooling fan 60 that sends cooling air W to the first and second compression sections 30, 40, etc.

[0031] The pair of air tanks 50 correspond to the tank portion of the present invention, and are each formed in the same shape, and have a tank body 51 made of a cylindrical steel plate, and a pair of tank lids 52 that seal both ends of the tank body 51. These air tanks 50 are firmly connected to each other by a plurality of frame members 12 so that they are parallel to each other. The pair of air tanks 50 are also connected to each other by piping (not shown) so that their internal pressures are the same.

[0032] A total of four legs 13 are attached to the installation surface SF side (lower in FIGS. 2 and 3) of the pair of air tanks 50. These legs 13 extend from the pair of air tanks 50 toward the installation surface SF side (lower in FIGS. 2 and 3), and the height of each of the pair of air tanks 50 can be adjusted independently. This allows the air compressor 10 to be installed stably without rattle, even on an uneven installation surface SF.

[0033] Furthermore, a plurality of mounting portions 14 are integrally provided on the opposite side of the pair of air tanks 50 from the installation surface SF side (upper side in FIG. 2). The first and second compression portions 30, 40 are firmly fixed to these mounting portions 14 with fixing bolts or the like (not shown). In other words, the first and second compression portions 30, 40 are arranged on the opposite side of the four leg portions 13, sandwiching the pair of air tanks 50 therebetween.

[0034] Furthermore, a cooling fan 60 is provided on the opposite side of the pair of air tanks 50 from the installation surface SF side (upper side in FIG. 2) and in the vicinity of the first and second compression sections 30, 40. Specifically, the cooling fan 60 and the first and second compression sections 30, 40 are aligned in the direction in which the pair of air tanks 50 are aligned (the left-right direction in FIGS. 2 and 3, the up-down direction in FIG. 1).

[0035] Here, an axial flow fan is used as the cooling fan 60. That is, air (cooling air W) drawn in by the cooling fan 60 is discharged in the axial direction of the rotation shaft RS. This allows the first and second compression sections 30, 40, which are arranged behind the cooling fan 60 and which are prone to heat generation due to compression operation, to be effectively cooled (improved cooling efficiency). Here, the white arrows shown in Figures 1 to 3 indicate the flow path of the cooling air W.

[0036] A flat, generally disk-shaped electric motor 16 is provided between the cooling fan 60 and the first and second compression sections 30, 40. The electric motor 16 is a brushless motor, and is precisely controlled by a control section 17 equipped with an inverter circuit (not shown). The control section 17 is electrically connected to a power plug PG, pressure sensors (not shown) that detect the internal pressure of each air tank 50, and an operation panel PN that is operated by an operator.

[0037] The operation panel PN is provided with a power switch, a power indicator light, and a digital display (none of which are shown) that displays the internal pressure of the air tank 50. This allows the operator to grasp the operating status of the air compressor 10 at a glance.

[0038] Furthermore, a low-pressure coupler 18 and a high-pressure coupler 19 are provided on the opposite side of the installation surface SF of the pair of air tanks 50 (upper side in Figs. 2 and 3) and on the opposite side of the first and second compression sections 30, 40 from the cooling fan 60 side (right side in Figs. 2 and 3, lower side in Fig. 1). Two low-pressure couplers 18 and two high-pressure couplers 19 are provided.

[0039] External equipment that operates at low pressure, such as pneumatic equipment that operates at an operating pressure of about 0.8 MPa, can be connected to the low-pressure coupler 18. On the other hand, external equipment that operates at high pressure, such as pneumatic equipment that operates at an operating pressure of about 2.5 MPa, can be connected to the high-pressure coupler 19.

[0040] A pressure gauge PR and a pressure reducing valve RV are provided near these couplers 18, 19. An operator can operate the pressure reducing valve RV while visually checking the pressure gauge PR, thereby adjusting the operating pressure of external equipment (pneumatic equipment) connected to the air compressor 10 to an appropriate pressure.

[0041] 3, a drain cock DC and a drain pipe DP are provided on the side of the air compressor 10. By operating the drain cock DC, water (not shown) that has accumulated in the air tank 50 or the like due to the compression operation can be drained to the outside via the drain pipe DP.

[0042] <Detailed structure of the compression section and compressed air flow path> Next, the structure around the first and second compression sections 30, 40 will be described in detail with reference to the drawings, along with the flow path of the air (compressed air) compressed by the first and second compression sections 30, 40. The first and second compression sections 30, 40 correspond to the compression sections in the present invention.

[0043] The first compression section 30 and the second compression section 40 are connected in series to each other. The first and second compression sections 30, 40 are both formed in the same manner, with the first compression section 30 being disposed on the upstream side (intake side) of the compressed air flow path, and the second compression section 40 being disposed on the downstream side (exhaust side) of the compressed air flow path.

[0044] The first and second compression sections 30 and 40 respectively include first and second cylinders 31 and 41. First and second oscillating pistons 32 and 42 are respectively slidably provided inside the first and second cylinders 31 and 41. The first and second oscillating pistons 32 and 42 are driven by a rotation shaft RS, and as the rotation shaft RS rotates, the first and second oscillating pistons 32 and 42 slide while oscillating inside the first and second cylinders 31 and 41, respectively.

[0045] The first and second compression sections 30, 40 are disposed opposite each other with the rotary shaft RS in between. As the rotary shaft RS rotates, the first oscillating piston 32 moves in the compression direction (leftward in FIG. 1) inside the first cylinder 31, and the second oscillating piston 42 moves in the intake direction (leftward in FIG. 1) inside the second cylinder 41. As the rotary shaft RS rotates, the first oscillating piston 32 moves in the intake direction (rightward in FIG. 1) inside the first cylinder 31, and the second oscillating piston 42 moves in the compression direction (rightward in FIG. 1) inside the second cylinder 41.

[0046] Here, the first and second cylinders 31, 41 have cylinder lower chambers 31a, 41a and cylinder upper chambers 31b, 41b, respectively, with the first and second oscillating pistons 32, 42 as the boundary. Air supplied to the cylinder lower chambers 31a, 41a moves to the low-pressure side cylinder upper chamber 31b and is compressed. The air compressed in the low-pressure side cylinder upper chamber 31b then moves from the low-pressure side cylinder upper chamber 31b through metal piping P1 made of a copper pipe or the like to the high-pressure side cylinder upper chamber 41b, where it is further compressed and discharged from the high-pressure side cylinder upper chamber 41b to the outside.

[0047] A metal pipe P1 made of a copper pipe or the like is provided between the upper cylinder chamber 31b of the first compression section 30 and the upper cylinder chamber 41b of the second compression section 40. As a result, the air compressed in the first compression section 30 is supplied to the second compression section 40. In this way, in the air compressor 10 of this embodiment, the air is compressed in two stages in the first and second compression sections 30, 40. In other words, the first compression section 30 is for "low pressure" and the second compression section 40 is for "high pressure."

[0048] Here, the upstream side of an exhaust pipe P2 (see FIG. 6) formed of an elastic body that can withstand high pressure is connected to the upper cylinder chamber 41b of the second compression section 40. The downstream side of the exhaust pipe P2 is connected to one of a pair of air tanks 50. As a result, air compressed in the second compression section 40 (compressed air) flows into each air tank 50 and is stored therein.

[0049] Meanwhile, the downstream side (upper side in FIG. 2) of the intake pipe P3 is connected to the lower cylinder chambers 31a, 41a of the first and second compression sections 30, 40. Here, because uncompressed air, i.e., air at atmospheric pressure, flows through the intake pipe P3, there is no need for piping that can withstand high pressure. For this reason, for example, an inexpensive PVC pipe is used for the intake pipe P3.

[0050] An intake section 20 that draws in atmospheric air is connected to the upstream side (lower side in FIG. 2) of the intake pipe P3. As a result, air that has been purified through a dust collection filter 25 that forms the intake section 20 is supplied from the intake pipe P3 to the first compression section 30.

[0051] The rotating shaft RS is the rotating shaft of the electric motor 16, and as the electric motor 16 rotates, a flow of compressed air is generated as described above. On the other hand, a cooling fan 60 is fixed to the axial end of the rotating shaft RS. Therefore, the cooling fan 60 is also rotated by the rotation of the electric motor 16.

[0052] That is, one electric motor 16 simultaneously generates a flow of cooling air W (first air flow) by the cooling fan 60 and a flow of compressed air (second air flow) by the first and second compression sections 30, 40. As described above, these two air flows (first and second air flows) are generated separately without interfering with each other. Therefore, dust contained in the cooling air W does not get mixed into the compressed air.

[0053] <Intake section structure> 2, 5, and 6, the upstream side of the intake pipe P3, i.e., the intake section 20 side, is provided between the pair of air tanks 50. Specifically, the upstream side of the intake pipe P3 is provided between the pair of air tanks 50 and on the first compression section 30 side in the longitudinal direction of the pair of air tanks 50 (left side in FIGS. 5 and 6). As a result, the upstream side of the intake pipe P3 is located approximately directly below the first compression section 30 (lower side in FIG. 2).

[0054] As shown in Fig. 2, the intake unit 20 connected to the upstream side of the intake pipe P3 is disposed on the opposite side of the cooling fan 60 (lower in Fig. 2) with the pair of air tanks 50 in between. That is, with the installation surface SF as the reference, the cooling fan 60 is disposed above the pair of air tanks 50, and the intake unit 20 is disposed below the pair of air tanks 50. Furthermore, the cooling fan 60 is disposed on one side in the first direction (left side in Fig. 2) of the pair of air tanks 50, and the intake unit 20 is disposed on the other side in the first direction (right side in Fig. 2) of the pair of air tanks 50 that is located on one side in the first direction. Therefore, the intake unit 20 is located away from the cooling fan 60, and the cooling air W from the cooling fan 60, which contains a lot of dust, is unlikely to reach the intake unit 20.

[0055] The intake section 20 is provided integrally with a base member BM that is attached to the pair of air tanks 50. The base member BM is made of a resin material such as plastic and is formed in the shape of a long plate. The base member BM including the intake section 20 is also disposed between the pair of air tanks 50, similar to the intake pipe P3.

[0056] One longitudinal side of the base member BM (the intake section 20 side) is fixed to one frame member 12 together with the filter cover 27 by a first fixing screw S1, and the other longitudinal side of the base member BM (the opposite side to the intake section 20 side) is fixed to another frame member 12 by a second fixing screw S2.

[0057] 2, 3, and 6, the base member BM including the intake section 20 is arranged so as to be hidden between a pair of air tanks 50. Here, each of the pair of air tanks 50 is formed in a cylindrical shape and extends in a direction (second direction) that intersects both the up-and-down direction and the arrangement direction (first direction) of the pair of air tanks 50.

[0058] 3, an upper tank portion 51a (see the black dot in FIG. 3) that is located at the highest position relative to the installation surface SF is provided above the tank main body 51. Also, a lower tank portion 51b (see the black dot in FIG. 3) that is located at the lowest position relative to the installation surface SF is provided below the tank main body 51.

[0059] A protrusion 51c (see the black dot in FIG. 3) is provided in the vertically intermediate portion of the tank body 51, protruding in a first direction intersecting the vertical direction further than the tank upper portion 51a and the tank lower portion 51b (the upper and lower portions of the air tank 50). In other words, the tank body 51 has a cylindrical shape extending along the second direction, with both ends in the second direction closed by hemispherical walls, and the vertically intermediate portion protruding in the first and second directions. Furthermore, the protrusion 51c of one air tank 50 and the protrusion 51c of the other air tank 50 face each other.

[0060] 2 to 4, and the up-down direction in FIGS. 1 and 5, and is the arrangement direction of the pair of air tanks 50. The longitudinal direction of the pair of air tanks 50, i.e., the direction intersecting both the up-down direction and the first direction, is defined as the second direction.

[0061] In the first direction, a dead space DS having a substantially triangular cross section along the first direction is formed between the pair of air tanks 50 and below the pair of protrusions 51c. The dead space DS extends in the second direction, and a base member BM including an intake section 20 is disposed in the dead space DS.

[0062] 6, when the pair of air tanks 50 are viewed from the arrangement direction (first direction), the base member BM including the intake section 20 is hidden by the pair of air tanks 50. In this way, the intake section 20 required for the air compressor 10 is disposed in the dead space DS, and the entire air compressor 10 can be made smaller than before.

[0063] Furthermore, by providing the base member BM including the intake unit 20 so as to be hidden between the pair of air tanks 50, the base member BM including the intake unit 20 is disposed above the lower ends (installation surface SF) of a total of four leg parts 13. In other words, the intake unit 20 is disposed at a position spaced apart from the installation surface SF by the distance of the leg parts 13.

[0064] This prevents intake unit 20 from sucking in dust on installation surface SF. As described above, cooling fan 60 is located away from intake unit 20 (see FIG. 2), which prevents dust on installation surface SF from being stirred up by cooling air W, and in this respect, intake unit 20 also avoids sucking in dust.

[0065] <Intake case> 6 and 7, the intake unit 20 includes an intake unit case 21 formed in a generally box shape from a resin material such as plastic. The intake unit case 21 is provided integrally with the base member BM, and when viewed from above and below, the intake unit case 21 is formed in a generally square shape as shown in FIG.

[0066] The intake case 21 includes, from its upstream side, i.e., the inlet side where air (gas) is drawn in, an inlet section 22, an outlet section 23, and an extension section 24. The flow path cross-sectional area gradually decreases from the inlet section 22 toward the extension section 24. That is, if the flow path cross-sectional area of ​​the inlet section 22 is S1, the flow path cross-sectional area of ​​the outlet section 23 is S2, and the flow path cross-sectional area of ​​the extension section 24 is S3, then the relationship S1>S2>S3 is satisfied.

[0067] The inlet portion 22, which forms part of the intake portion case 21, is hollow and has a substantially square shape when viewed from above and below. The depth dimension d1 of the inlet portion 22 along the air flow direction is substantially the same as the outer diameter dimension OD1 of the intake pipe P3 (d1 ≒ OD1). The inlet portion 22 has a flattened shape (rectangle) that extends in both the first and second directions, and corresponds to the flattened portion in the present invention.

[0068] Also, a part of the outlet portion 23 that forms a part of the intake portion case 21 is also hollow. However, when viewed from the vertical direction, the outlet portion 23 is formed in a substantially circular shape. The depth dimension d2 along the air flow direction of the outlet portion 23 is slightly shallower than the depth dimension d1 of the inlet portion 22 (d2 < d1). Further, the outlet portion 23 also has a flat shape (circular shape) extending in both the first direction and the second direction, and the outlet portion 23 also corresponds to the flat portion in the present invention.

[0069] When the inlet portion 22 is viewed from the vertical direction, a part of the inlet portion 22 overlaps with the protruding portions 51c of the pair of air tanks 50 as shown in FIG. 5. Also, a part of the outlet portion 23 having a smaller flow path cross-sectional area than the inlet portion 22 also overlaps with the protruding portions 51c of the pair of air tanks 50.

[0070] In other words, the arrangement range of the inlet portion 22 and the outlet portion 23 in the first direction that forms the intake portion 20 overlaps at least partially with the pair of air tanks 50 when the intake portion 20 is viewed from the vertical direction (see the broken line portion in FIG. 5). Also, in the arrangement range of the inlet portion 22 and the outlet portion 23 in the second direction that forms the intake portion 20, when the intake portion 20 is viewed from the vertical direction, it overlaps at least partially with the pair of air tanks 50 (see the broken line portion in FIG. 5).

[0071] In this way, the shape of the intake portion 20 is a waste-free shape that can effectively utilize the dead space DS formed between the pair of air tanks 50 with substantially no gap. Therefore, it is possible to improve the intake efficiency of the intake portion 20 while miniaturizing the air compressor 10.

[0072] The extension 24 extending upward from the outlet 23, i.e., the extension 24 protruding toward the intake pipe P3, has an outer diameter OD2 that allows it to fit between the pair of air tanks 50. The extension 24 is a hollow pipe and is fitted radially inside the intake pipe P3. The outer diameter OD2 of the extension 24 is slightly smaller than the outer diameter OD1 of the intake pipe P3 (OD2 <OD1)。

[0073] Furthermore, the intake pipe P3 connecting the intake case 21 and the first compression section 30 corresponds to the intake passage in the present invention, and the intake pipe P3 communicates with the outside via the intake case 21.

[0074] In addition, the inlet section 22 forming the intake section case 21 is provided with an intake port 22a that connects the inside and outside of the intake section case 21. A dust collection filter 25 (see the shaded area in the figure) is housed inside the inlet section 22 from the intake port 22a. As a result, all of the air drawn into the intake section 20 passes through the dust collection filter 25. Since the dust collection filter 25 is disposed in the widest part of the intake section case 21, that is, the part with the largest cross-sectional area of ​​the flow path, it has a high dust collection capability. This makes it possible to extend the maintenance interval.

[0075] As shown in Fig. 4 "Dust filter attached state," the dust collection filter 25 is formed in a substantially rectangular plate shape so that it fits snugly inside the inlet portion 22. The dust collection filter 25 captures dust contained in the air flowing from the intake port 22a toward the intake pipe P3. The dust collection filter 25 corresponds to the filter portion of the present invention and is made of, for example, nonwoven fabric, felt, or a porous material. Examples of porous materials include those made by sintering plastic powder such as polyethylene or polypropylene.

[0076] Also, air intake 22a is provided on the opposite side of air intake case 21 from cooling fan 60. This prevents cooling air W from being sucked in from cooling fan 60. Furthermore, by providing air intake 22a on the opposite side of air intake case 21 from cooling fan 60, replacement of dust collection filter 25 and the like can be easily performed, improving maintainability.

[0077] Furthermore, outlet section 23 of intake section case 21 connects intake pipe P3 and inlet section 22, and has a larger flow path cross-sectional area than intake pipe P3 and a smaller flow path cross-sectional area than inlet section 22. As a result, as shown in Figures 6 and 7, dust collection filter 25, which is accommodated in inlet section 22 with almost no gap between them, covers outlet section 23.

[0078] A first rib 22c protruding toward the intake port 22a side of the inlet portion 22 is integrally provided on the bottom wall 22b of the inlet portion 22. Here, the bottom wall 22b forms the inner wall of the inlet portion 22 and corresponds to the inner wall in the present invention, and the first rib 22c corresponds to the rib in the present invention.

[0079] 7, first rib 22c is provided so as to surround the outer edge of connection portion 26 between inlet portion 22 and outlet portion 23, and bites into dust collection filter 25 housed in inlet portion 22. Here, connection portion 26 is formed by a cylindrical side wall that forms outlet portion 23, and is arranged on the inlet portion 22 side of the cylindrical side wall.

[0080] In this way, by providing the first rib 22c and making the first rib 22c bite into the dust collecting filter 25, the tightness of contact (sealing) between the intake case 21 and the dust collecting filter 25 is improved. In other words, a gap is prevented from being formed between the first rib 22c and the dust collecting filter 25. If a gap were to be formed between them, it is conceivable that air containing dust would flow into the gap and reach the intake pipe P3 without passing through the dust collecting filter 25. In this way, the first rib 22c has the function of improving the dust collection performance of the dust collecting filter 25.

[0081] Additionally, the intake port 22a (inlet portion 22) of the intake portion case 21 is closed by a filter cover 27. The filter cover 27 has a shape as shown in Fig. 8. The filter cover 27 has a cover main body 27a formed in a substantially flat plate shape from a resin material such as plastic.

[0082] The cover body 27a is formed in a substantially rectangular shape, and has a claw portion 27b integrally formed on one longitudinal side (upper side in FIG. 8) thereof for hooking onto the base member BM. Meanwhile, a screw hole 27c through which a first fixing screw S1 (see FIG. 7) is inserted is formed on the other longitudinal side (lower side in FIG. 8) of the cover body 27a. That is, the one longitudinal side of the base member BM and the filter cover 27 are fastened together by the first fixing screw S1. This eliminates the need for other fixing screws, thereby reducing the number of parts.

[0083] The cover body 27a is provided with two ventilation sections 27d. Each of the ventilation sections 27d has a bottom wall section 27e that is recessed from the cover body 27a. A plurality of ventilation holes 27f are provided between the bottom wall section 27e and the cover body 27a, penetrating the filter cover 27 in both the longitudinal and lateral directions.

[0084] This causes the path of the air drawn into intake case 21 to bend in a labyrinth shape, thereby preventing relatively large dust particles contained in the air from reaching dust collection filter 25. This also makes it possible to extend the maintenance cycle of dust collection filter 25 (improved maintainability).

[0085] Furthermore, second ribs 27g are provided on the back side (right side in FIG. 8) of the filter cover 27 so as to surround the pair of ventilation parts 27d and protrude towards the dust collection filter 25. The second ribs 27g also bite into the dust collection filter 25, similar to the first ribs 22c of the intake part case 21 (see FIG. 7).

[0086] By providing the second rib 27g and having the second rib 27g bite into the dust collection filter 25 in this way, the pressing force of the filter cover 27 is transmitted to the first rib 22c via the dust collection filter 25. This makes it possible to further improve the adhesion of the dust collection filter 25 to the first rib 22c. In this way, the second rib 27g has the function of making the dust collection filter 25 more closely adhere to the first rib 22c.

[0087] <Dust filter installation procedure> 9, in order to attach the dust collection filter 25 to the intake case 21, first, the dust collection filter 25 and the filter cover 27 are prepared. The first fixing screw S1 is attached to the filter cover 27 in advance via a metal sleeve to prevent it from falling off.

[0088] Then, as shown by arrow M1 in the figure, dust collecting filter 25 is brought into contact with air intake port 22a of inlet portion 22 and is fitted by being pushed into the interior of inlet portion 22. At this time, dust collecting filter 25 is fitted into inlet portion 22 while elastically deforming, and therefore dust collecting filter 25 housed in inlet portion 22 will not fall off from inlet portion 22.

[0089] Thereafter, as shown by arrow M2 in the figure, the filter cover 27 is brought to face the intake unit case 21, and the claws 27b of the filter cover 27 are hooked onto the base member BM. Subsequently, the first fixing screw S1 attached to the filter cover 27 is fastened to one of the frame members 12. This fixes the filter cover 27 to the intake unit case 21 (base member BM).

[0090] At this time, the filter cover 27 side of the dust collecting filter 25 is pressed by the second rib 27g of the filter cover 27, and part of the second rib 27g bites into the dust collecting filter 25 (see FIG. 7). The dust collecting filter 25 is also pressed by the filter cover 27, and the intake pipe P3 side thereof is pressed against the first rib 22c of the inlet portion 22. Therefore, the first rib 22c bites into the dust collecting filter 25 (see FIG. 7), ensuring close contact (sealing) of the dust collecting filter 25 with the intake portion case 21.

[0091] This completes the attachment of the dust collection filter 25 to the intake case 21. To remove the dust collection filter 25 from the intake case 21, the above-described procedure can be reversed.

[0092] As described above in detail, according to air compressor 10 according to this embodiment, intake section 20 is disposed on the opposite side of cooling fan 60 with a pair of air tanks 50 in between, so that intake section 20 can be located away from cooling fan 60. This makes it difficult for cooling air W from cooling fan 60, which contains a lot of dust, to reach intake section 20.

[0093] Therefore, early clogging of the dust collection filter 25 is suppressed, and maintenance can be improved.

[0094] Furthermore, since there is no need to provide the intake section 20 on the path along which the cooling air W from the cooling fan 60 flows, there is no need to ensure space for the intake section 20 around the cooling fan 60.

[0095] Therefore, the entire air compressor 10 can be made smaller.

[0096] Furthermore, according to the air compressor 10 of this embodiment, the cooling fan 60 is disposed above the pair of air tanks 50, and the intake section 20 is disposed below the pair of air tanks 50.

[0097] This makes it possible to prevent dust on the installation surface SF from being stirred up by the cooling air W from the cooling fan 60, and prevents the intake section 20 from sucking in the dust.

[0098] Furthermore, according to the air compressor 10 of this embodiment, the air tank 50 has a protruding portion 51c in the middle portion of the air tank 50 in the vertical direction, which protrudes in a first direction intersecting the vertical direction further than the upper and lower portions of the air tank 50, and the intake portion 20 is arranged below the protruding portion 51c.

[0099] As a result, a dead space DS having a substantially triangular cross section along the first direction is formed between the pair of air tanks 50 and below the pair of protrusions 51c, and the intake section 20 can be disposed in the dead space DS. This makes it possible to make the entire air compressor 10 smaller than before.

[0100] Furthermore, according to the air compressor 10 of this embodiment, a pair of air tanks 50 are provided side by side in the first direction, and the intake section 20 is disposed between the pair of air tanks 50 in the first direction.

[0101] This also allows the intake section 20 to be arranged by effectively utilizing the dead space DS, making it possible to make the entire air compressor 10 smaller than before.

[0102] Furthermore, according to the air compressor 10 of this embodiment, the placement range of the intake section 20 in the first direction at least partially overlaps with the pair of air tanks 50 when the intake section 20 is viewed from above and below.

[0103] As a result, when the air compressor 10 is viewed from above and below, a part of the intake section 20 is hidden by the pair of air tanks 50, and the entire air compressor 10 can be made smaller.

[0104] Furthermore, according to the air compressor 10 of this embodiment, the intake section 20 has flat-shaped inlet section 22 and outlet section 23 extending in the first direction, and an extension section 24 extending upward from the inlet section 22 and the outlet section 23, and the inlet section 22 and the outlet section 23 overlap with the protrusion 51c when viewed from above and below.

[0105] This also allows a portion of the intake section 20 to be hidden by the pair of air tanks 50 when the air compressor 10 is viewed from above and below, thereby making it possible to reduce the overall size of the air compressor 10.

[0106] Furthermore, according to the air compressor 10 of this embodiment, if the direction intersecting both the vertical direction and the first direction is defined as the second direction, the placement range of the intake section 20 in the second direction at least partially overlaps with a pair of air tanks 50 when the intake section 20 is viewed from the vertical direction.

[0107] This also allows a portion of the intake section 20 to be hidden by the pair of air tanks 50 when the air compressor 10 is viewed from above and below, thereby making it possible to reduce the overall size of the air compressor 10.

[0108] Furthermore, according to the air compressor 10 of this embodiment, the pair of air tanks 50 are formed in a cylindrical shape extending in the second direction, so that a dead space DS sufficient to place the intake section 20 can be formed below the pair of protrusions 51c.

[0109] Furthermore, air compressor 10 according to this embodiment has legs 13 extending downward from a pair of air tanks 50, and intake section 20 is disposed above the lower ends of legs 13, so intake section 20 does not need to suck in dust on installation surface SF. This extends the replacement cycle of dust collection filter 25, improving maintainability.

[0110] Furthermore, in the air compressor 10 according to this embodiment, the cooling fan 60 is an axial flow fan.

[0111] This effectively cools the first and second compression sections 30, 40, which are located behind the cooling fan 60 and which tend to generate heat during compression. In addition, the cooling air W can be distributed evenly inside the body cover 15 that forms the outer shell of the air compressor 10, which also improves cooling efficiency.

[0112] Furthermore, according to the air compressor 10 of this embodiment, the intake section 20 comprises an intake section case 21, an intake pipe P3 connecting the intake section case 21 and the first compression section 30, an intake port 22a connecting the inside and outside of the intake section case 21, and a dust collecting filter 25 housed in the intake section case 21 and collecting dust contained in the air flowing from the intake port 22a toward the intake pipe P3.

[0113] This allows the intake section 20 to be compactly arranged in the dead space DS, while still allowing clean air to be sent to the first compression section 30.

[0114] Furthermore, according to air compressor 10 of this embodiment, air intake 22a is provided on the side of air intake unit case 21 opposite to the cooling fan 60 side, which makes it possible to prevent the cooling air W from being sucked in from cooling fan 60. Furthermore, work such as replacing dust collection filter 25 can be easily performed, improving maintainability.

[0115] Furthermore, according to the air compressor 10 of this embodiment, the intake section case 21 has an inlet section 22 in which an intake port 22a is provided, and an outlet section 23 that connects the intake pipe P3 and the inlet section 22 and has a flow path cross-sectional area larger than that of the intake pipe P3 and smaller than that of the inlet section 22, and the dust collecting filter 25 is housed in the inlet section 22 and covers the outlet section 23.

[0116] This makes it difficult for dust contained in the air to reach the intake pipe P3, and therefore, clean air can be sent to the first compression section 30.

[0117] Furthermore, according to the air compressor 10 of this embodiment, the intake section case 21 has a first rib 22c that protrudes from the bottom wall 22b of the inlet section 22 toward the dust collecting filter 25, and the first rib 22c is arranged to surround the outer edge of the connection section 26 between the inlet section 22 and the outlet section 23.

[0118] This allows the first rib 22c to bite into the dust collection filter 25, thereby improving the adhesion (sealing) between the intake portion case 21 and the dust collection filter 25. This also makes it possible to send cleaner air to the first compression portion 30.

[0119] The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications are possible without departing from the spirit and scope of the present invention. For example, in the above-described embodiment, a so-called "reciprocating type" air compressor having first and second oscillating pistons 32, 42 has been described as an example, but the present invention is not limited to this and can also be applied to a so-called "scroll type" air compressor having a pair of interlocking scroll members.

[0120] Furthermore, in the above-described embodiment, an air compressor 10 having a pair of air tanks 50 is shown, but the present invention is not limited to this, and can be applied to, for example, an air compressor having one air tank or an air compressor having three or more air tanks, as long as a dead space DS (see Figures 2 and 3) is formed.

[0121] Furthermore, the material, shape, size, number, installation location, etc. of each component in the above-described embodiments are arbitrary as long as they can achieve the present invention, and are not limited to the above-described embodiments. [Explanation of symbols]

[0122] 10...Air compressor (work machine), 11...Handle, 12...Frame member, 13...Leg, 14...Mounting portion, 15...Body cover, 16...Electric motor, 17...Control unit, 18...Low pressure coupler, 19...High pressure coupler, 20...Intake portion, 21...Intake portion case, 22...Inlet portion (flat portion), 22a...Intake port, 22b...Bottom wall (inner wall), 22c...First rib (rib), 23...Outlet portion (flat portion), 24...Extension portion, 25...Dust collection filter (filter portion), 26...Connection portion, 27...Filter cover, 27a...Cover body, 27b...Claw portion, 27c...Hole, 27d...Ventilation portion, 27e...Bottom wall portion, 27f...Ventilation hole, 27g...Second rib, 30...First compression portion (compression portion), 31...First cylinder, 31a...cylinder lower chamber, 31b...cylinder upper chamber, 32...first oscillating piston, 40...second compression section (compression section), 41...second cylinder, 41a...cylinder lower chamber, 41b...cylinder upper chamber, 42...second oscillating piston, 50...air tank (tank section), 51...tank body, 51a...tank upper section, 51b...tank lower section, 51c...projection section, 52...tank lid, 60...cooling fan (axial fan), BM...base member, DC...drain cock, DP...drain piping, DS...dead space, P1...metal piping, P2...exhaust pipe, P3...intake pipe (intake passage), PG...power plug, PN...operation panel, PR...pressure gauge, RS...rotating shaft, RV...pressure reducing valve, SF...installation surface, W...cooling air

Claims

1. an intake section that draws in gas; a compression section that compresses and discharges the gas taken in through the intake section; a tank section into which the gas discharged from the compression section flows; a cooling fan disposed above the tank section and configured to send cooling air to the compression section; Equipped with The tank portion is provided in a plurality of rows in a first direction intersecting with the vertical direction, and has a protruding portion at a middle portion in the vertical direction that protrudes in the first direction further than the upper and lower portions, The intake portion is disposed between the plurality of tank portions in the first direction and below the protrusion portion. Work equipment.

2. an arrangement range of the intake section in the first direction at least partially overlaps with the tank section when the intake section is viewed from the up-down direction; The work machine according to claim 1 .

3. The intake section a flat portion having a flat shape extending in the first direction; an extension portion extending upward from the flat portion; Equipped with the flat portion overlaps with the protruding portion when viewed from the up-down direction; The work machine according to claim 1 or 2.

4. If a direction intersecting both the up-down direction and the first direction is defined as a second direction, an arrangement range of the intake section in the second direction at least partially overlaps with the tank section when the intake section is viewed from the up-down direction; The work machine according to any one of claims 1 to 3.

5. The tank portion is formed in a cylindrical shape extending in the second direction. The work machine according to claim 4.

6. a leg portion extending downward from the tank portion; The intake section is disposed above the lower end portion of the leg section. A work machine according to any one of claims 1 to 5.

7. The cooling fan is an axial flow fan. The work machine according to any one of claims 1 to 6.

8. The intake section an intake case; an intake passage connecting the intake section case and the compression section; an intake port communicating the inside and outside of the intake unit case; a filter section housed in the intake section case and configured to capture dust contained in the gas flowing from the intake port to the intake passage; Equipped with A work machine according to any one of claims 1 to 7.

9. The air intake port is provided on the side of the air intake case opposite to the cooling fan side. The work machine according to claim 8.

10. The intake case is an inlet portion provided with the intake port; an outlet portion that connects the intake passage and the inlet portion, the outlet portion having a flow path cross-sectional area larger than that of the intake passage and smaller than that of the inlet portion; and The filter unit is accommodated in the inlet unit and covers the outlet unit. The work machine according to claim 8 or claim 9.

11. the intake case includes a rib protruding from an inner wall of the inlet toward the filter, The rib is provided to surround an outer edge of a connection portion between the inlet portion and the outlet portion. The work machine according to claim 10.

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