Work machine
The work machine's insertion tube design with elastic and hard components addresses pipe crushing issues, improving drainage efficiency and convenience by using a bend structure for the drain discharge pipe.
Patent Information
- Application Number
- JP2023123768
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-07-28
- Publication Date
- 2025-02-07
AI Technical Summary
In work machines with tanks for storing compressed air, bending a drain discharge pipe can lead to crushing, which impedes effective drainage and reduces convenience.
The work machine incorporates an insertion tube with a bend connecting horizontal and vertical portions, featuring a first elastic member and a second member with higher hardness, ensuring effective drainage without pipe crushing.
This design enhances the convenience of the work machine by preventing pipe crushing and ensuring efficient drainage, while reducing costs and simplifying attachment through screwing mechanisms.
Smart Images
Figure 2025019887000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a work machine. [Background technology]
[0002] The air compressor described in Patent Document 1 includes a compressed air generating unit that generates compressed air, an air tank in which the compressed air generated by the compressed air generating unit is stored, and a drain discharge mechanism that discharges drainage from within the air tank. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] JP 2016-121588 A Summary of the Invention [Problem to be solved by the invention]
[0004] In a work machine having a tank for storing compressed air, when a drain discharge pipe is placed inside the tank by penetrating the side of the tank, part of the pipe needs to be bent toward the bottom of the tank.
[0005] However, when a part of the pipe is bent, the bent portion may be crushed, which may hinder the drainage from being discharged. In other words, the convenience of the work machine may be reduced.
[0006] An object of the present invention is to provide a work machine with improved convenience. [Means for solving the problem]
[0007] A working machine in one embodiment has a tank section that stores compressed air, a compression section that sends compressed air to the tank section, and an insertion tube that connects the inside and outside of the tank section, wherein the insertion tube extends along a horizontal direction perpendicular to the vertical direction and includes a first portion that penetrates the tank section, a second portion that extends along the vertical direction, and a curved portion that connects the first portion and the second portion, wherein the second portion is made of a first member having elasticity, and the curved portion is made of a second member having a harder hardness than the first member. Effect of the Invention
[0008] According to the present invention, the convenience of a work machine can be improved. [Brief description of the drawings]
[0009] [Figure 1] 1 is a perspective view showing the appearance of an air compressor according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a cross-sectional view showing the internal structure of the air compressor of the present embodiment. [Diagram 3] FIG. 2 is an exploded view showing a first air tank and an insertion pipe in the air compressor of the present embodiment. [Figure 4] FIG. 2 is a perspective view showing a state in which an insertion pipe is attached to a first air tank in the air compressor of the present embodiment. [Diagram 5] 1 is a vertical cross-sectional view showing an internal structure of an air compressor according to an embodiment of the present invention. [Figure 6] FIG. 2 is a schematic diagram showing a connection state of each air tank of the air compressor of the present embodiment. [Figure 7] FIG. 2 is a front view showing the internal structure of the air compressor of the present embodiment as viewed from the front side. [Figure 8] 2 is a block diagram showing a connection state of each part in the air compressor of the present embodiment. FIG. [Figure 9] 2 is a longitudinal sectional view of the internal structure of the air compressor of the present embodiment, as viewed from the rear side. FIG. [Figure 10] FIG. 2 is an exploded view of an insertion tube in the air compressor of the present embodiment. [Figure 11]2 is a vertical cross-sectional view of a state in which an insertion pipe is assembled to a first air tank of the air compressor of the present embodiment, as viewed from the right side. FIG. [Figure 12] 1 is a vertical cross-sectional view showing a contact state between an insertion tube and an inner surface of a first air tank when the insertion tube is rotated and assembled to the first air tank of the air compressor of the present embodiment. FIG. [Figure 13] 1 is a cross-sectional view showing a contact state between an insertion tube and an inner surface of a first air tank when the insertion tube is rotated and assembled to the first air tank of the air compressor of the present embodiment. FIG. [Figure 14] 2 is a vertical cross-sectional view seen from the front side of a state in which an insertion pipe is assembled to a first air tank of the air compressor of the present embodiment. FIG. [Figure 15] 2 is a cross-sectional view seen from above of a state in which an insertion pipe is assembled to a first air tank of the air compressor of the present embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0010] Hereinafter, an embodiment of a work machine of the present invention will be described in detail with reference to the drawings. In addition, in all drawings referred to in describing the embodiment, the same or substantially the same configurations and elements are designated by the same reference numerals. Furthermore, as a rule, once a configuration or element has been described, the description will not be repeated.
[0011] [Air Compressor Overview] 1 shows an air compressor 10 as an example of a work machine. The air compressor 10 is capable of supplying compressed air to a pneumatic work machine such as a nail driver. The air compressor 10 has a main body frame 12, a tank unit 20, a compression section 40 (FIG. 2), and an insertion tube 100 (FIG. 2). The air compressor 10 is formed in a substantially rectangular parallelepiped shape.
[0012] <Main frame> The main body frame 12 includes a pair of handles 16. The main body frame 12 is provided with an operation panel 14. The operation panel 14 is provided with a display capable of displaying the remaining capacity of the battery pack 52, which will be described later, the internal pressure (MPa) of the tank unit 20, and the like. A plurality of legs 18 are provided on the underside of the main body frame 12. The main body frame 12 supports the tank unit 20, the compression section 40, and the insertion tube 100 (FIG. 2). An operator can move the air compressor 10 to any installation surface M by grasping and lifting the pair of handles 16.
[0013] <Tank unit> 2, the tank unit 20 has a first air tank 22, a second air tank 32, a third air tank 34, and a fourth air tank 36. The first air tank 22, the second air tank 32, the third air tank 34, and the fourth air tank 36 are each an example of a tank portion that stores compressed air A.
[0014] The first air tank 22, the second air tank 32, the third air tank 34, and the fourth air tank 36 each extend in the up-down direction, which is an example of the vertical direction. In other words, the first air tank 22, the second air tank 32, the third air tank 34, and the fourth air tank 36 stand upright in the up-down direction relative to the installation surface M (FIG. 1). This makes the installation area of the air compressor 10 smaller than the installation area of a configuration in which multiple air tanks extend horizontally.
[0015] The first air tank 22, the second air tank 32, the third air tank 34, and the fourth air tank 36 have similar structures although they are arranged differently in the air compressor 10. For this reason, when describing the structure of the tank unit 20, the first air tank 22 will be described in detail, and a detailed description of the second air tank 32, the third air tank 34, and the fourth air tank 36 will be omitted.
[0016] <Direction definition> The direction in which the first air tank 22 and the second air tank 32 are lined up is aligned with the direction in which the third air tank 34 and the fourth air tank 36 are lined up. This line-up direction is referred to as the left-right direction. The left-right direction is an example of the horizontal direction. The direction in which the first air tank 22 and the third air tank 34 are lined up is aligned with the direction in which the second air tank 32 and the fourth air tank 36 are lined up. This line-up direction is referred to as the front-rear direction. Here, the up-down direction, left-right direction, and front-rear direction are all perpendicular to each other.
[0017] The first air tank 22 and the second air tank 32 are located at the front side of the air compressor 10. The third air tank 34 and the fourth air tank 36 are located at the rear side of the air compressor 10. The first air tank 22 and the third air tank 34 are located at the left side of the air compressor 10. The second air tank 32 and the fourth air tank 36 are located at the right side of the air compressor 10. The operation panel 14 is located at the upper front end of the air compressor 10. The definitions of the up-down direction, the front-rear direction, and the left-right direction are merely for convenience of explanation.
[0018] <<First Air Tank>> 3, the first air tank 22 is a vertically long tank extending in the vertical direction. The first air tank 22 includes a cylindrical portion 23, a lower lid portion 27, and an upper lid portion .
[0019] The cylindrical portion 23 is made of a cylindrical steel plate. The cylindrical portion 23 has a central axis C along the vertical direction. Both vertical ends of the cylindrical portion 23 are closed by a lower cover portion 27 and an upper cover portion 28. The lower cover portion 27 is made of a dish-shaped (hemispherical) steel plate. The lower cover portion 27 is welded to the lower end of the cylindrical portion 23. The upper cover portion 28 is welded to the upper end of the cylindrical portion 23. In other words, the inside of the first air tank 22 is sealed. This allows the first air tank 22 to store compressed air A (FIG. 2).
[0020] A first attachment portion 24, a second attachment portion 25, and a third attachment portion 26 are provided in this order from the bottom to the top at a portion of the circumference of the cylindrical portion 23. An insertion tube 100, which will be described later, is attached (fixed) to the first attachment portion 24. As an example, a coupler (not shown) for connecting to another air compressor is attached to the second attachment portion 25. The coupler is connected to a connection portion 58 (FIG. 1) provided on the front side of the air compressor 10. A compression portion 40, which will be described later, is connected to the third attachment portion 26.
[0021] 4, the first mounting portion 24 has a circular through hole 24A that penetrates the cylindrical portion 23 in the radial direction (thickness direction). An internal thread portion 24B is formed on the inner wall surface of the through hole 24A. In other words, the first air tank 22 has the internal thread portion 24B. When the insertion tube 100 described later is attached to the first mounting portion 24, the through hole 24A is closed.
[0022] <Compression section> As shown in Fig. 2 and Fig. 5, the compression section 40 is surrounded by the tank unit 20. The compression section 40 compresses and sends out air at external atmospheric pressure. Air is an example of a gas. Specifically, the compression section 40 sends out compressed air A (Fig. 2) to each air tank of the tank unit 20.
[0023] The compression unit 40 can be driven by a battery pack 52 (FIG. 1). The battery pack 52 is a rechargeable secondary battery. Specifically, the battery pack 52 can be charged by power supplied from a power plug 54 (FIG. 1) connected to a commercial power source. The operation state of the compression unit 40 can be arbitrarily switched by operating the operation panel 14.
[0024] The compressed air A (FIG. 2) sent out from the compression section 40 flows into the first air tank 22, the second air tank 32, the third air tank 34, and the fourth air tank 36 (FIG. 2). In other words, the tank unit 20 stores the compressed air A sent out from the compression section 40.
[0025] 2, the compression section 40 has a structure that compresses air at external atmospheric pressure to high pressure in two stages, for example. The compression section 40 has a first compression section 42 that compresses air on the low pressure side, and a second compression section 44 that compresses air on the high pressure side. The first compression section 42 and the second compression section 44 are disposed opposite each other in the left-right direction.
[0026] An eccentric shaft 48 rotated by a motor 46 is rotatably provided between the first compression section 42 and the second compression section 44. The first compression section 42 is provided with a cylinder 43A and a piston 43B. The second compression section 44 is provided with a cylinder 45A and a piston 45B. As a result, as the eccentric shaft 48 rotates, the pistons 43B, 45B operate in the cylinders 43A, 45A, generating compressed air A.
[0027] The compressed air A generated by the first compression section 42 and the second compression section 44 flows into the first air tank 22, and then flows into the second air tank 32, the third air tank 34, and the fourth air tank 36. The first air tank 22, the second air tank 32, the third air tank 34, and the fourth air tank 36 are in communication with one another. That is, the internal pressures of the first air tank 22 to the fourth air tank 36 are all maintained at the same pressure.
[0028] The eccentric shaft 48 is rotated by a motor 46. The motor 46 is a brushless motor. The motor 46 is disposed on the axis of the eccentric shaft 48 between the first compression section 42 and the second compression section 44. The motor 46 is rotated by power supplied from a battery pack 52 or a power plug 54 (FIG. 1). The motor 46 is rotated at a predetermined rotation speed in a predetermined rotation direction by a drive circuit 88 (FIG. 8).
[0029] The compression unit 40 also includes a cooling fan 56 that is rotated by a motor 46. The cooling fan 56 functions to cool the first compression unit 42, the second compression unit 44, the battery pack 52 (FIG. 1), the drive circuit 88 (FIG. 8), and the like, which become hotter as the operation time increases.
[0030] 1, the air compressor 10 is provided with, for example, four couplers 64. Air tools such as nailers that are powered by compressed air can be connected to the four couplers 64. A pressure reducing valve 62 is provided above the couplers 64 in the air compressor 10.
[0031] The pressure reducing valve 62 includes a dial 63 that is operated by an operator. In the pressure reducing valve 62, the pressure of the compressed air A output from the coupler 64 is adjusted (reduced) by the operator rotating the dial 63. This allows the air tool connected to the coupler 64 to be operated at an appropriate air pressure according to its specifications.
[0032] A pair of connection parts 58 are provided below the coupler 64 in the air compressor 10. An air compressor (not shown) can be connected to the connection parts 58. For example, when another air compressor 10 is connected to each of the connection parts 58, the total capacity of the compressed air A can be increased three times.
[0033] <Piping> 2, the first air tank 22, the second air tank 32, the third air tank 34, and the fourth air tank 36 are connected to each other by a piping section 65 made of metal (aluminum), for example. Specifically, the piping section 65 includes a first pipe 66, a second pipe 67, a third pipe 68, a fourth pipe 69, and a fifth pipe 71. Note that the first pipe 66, the second pipe 67, the third pipe 68, the fourth pipe 69, and the fifth pipe 71 may be made of resin. The pressure reducing valve 62 (FIG. 1) and the first air tank 22 are connected by piping not shown.
[0034] <Discharge pipe section> 6, the air compressor 10 has a discharge pipe section 72. The discharge pipe section 72 discharges drain (water) stored in the first air tank 22, the second air tank 32, the third air tank 34, and the fourth air tank 36 to the outside. Specifically, the discharge pipe section 72 has a discharge pipe 73, a discharge pipe 74, and a discharge pipe 75. Note that the shapes of some of the discharge pipes are shown simplified.
[0035] The exhaust pipe 74 connects the third air tank 34 and the fourth air tank 36. The exhaust pipe 73 connects the first air tank 22 and a part of the exhaust pipe 74 on the third air tank 34 side. The exhaust pipe 75 connects the second air tank 32 and a part of the exhaust pipe 74 on the fourth air tank 36 side. The exhaust pipes 73, 74 and 75 are provided with four insertion pipes 100, which will be described later. An external exhaust pipe 77 is connected to the insertion pipe 100 located at the connection portion between the exhaust pipe 75 and the second air tank 32.
[0036] As shown in Fig. 7, a drain cock 78 is provided on the lower front surface of the air compressor 10. The drain cock 78 is provided so as to be switchable between an open position and a closed position. When the drain cock 78 is in the open position, the drainage collected in the discharge pipe 75 flows through the external discharge pipe 77 and is discharged to the outside of the air compressor 10. When the drain cock 78 is in the closed position, the drainage is not discharged because the discharge pipe 75 and the second air tank 32 are maintained in communication with each other.
[0037] <Control system> 8, the air compressor 10 has a control unit 80, a power supply control unit 82, a pressure sensor 84, an operation circuit 86, a drive circuit 88, and a rotation detection circuit 92. The external power supply to which the power plug 54 (FIG. 1) is connected is shown as an AC power supply unit 94. The battery pack 52 (FIG. 1) is shown as a DC power supply unit 96.
[0038] The pressure sensor 84 detects the internal pressures of the first air tank 22 to the fourth air tank 36 (FIG. 2). The detection result detected by the pressure sensor 84 is output as a pressure signal to the control unit 80. When the operation panel 14 (FIG. 1) is operated by an operator, the operation circuit 86 outputs an operation signal to the control unit 80. When the operation panel 14 is operated by the operator, the operating mode related to the power supply of the air compressor 10 is switched.
[0039] The operation modes include a first operation mode that uses the AC power supply unit 94, a second operation mode that uses the DC power supply unit 96, and a third operation mode that switches between the AC power supply unit 94 and the DC power supply unit 96. The drive circuit 88 is controlled by the control unit 80 to control the power supply to the motor 46. In other words, the drive circuit 88 drives and stops the motor 46. The rotation detection circuit 92 detects the number of rotations of the motor 46 based on the number of times the rotation position is detected within a unit time. The detection result by the rotation detection circuit 92 is output to the control unit 80 as a detection signal.
[0040] <Insertion tube> 2, the first air tank 22, the second air tank 32, the third air tank 34, and the fourth air tank 36 are each provided with an insertion tube 100. Note that, as an example, the insertion tube 100 is fixed to each of the first air tank 22, the second air tank 32, the third air tank 34, and the fourth air tank 36 (FIG. 2) in the same manner. For this reason, the fixing of the insertion tube 100 to the first air tank 22 will be described, and the description of the fixing of the insertion tube 100 to the second air tank 32, the third air tank 34, and the fourth air tank 36 will be omitted.
[0041] 9, the insertion tube 100 is provided inside and at a lower part of the first air tank 22. The insertion tube 100 communicates between the inside and the outside of the first air tank 22.
[0042] As shown in FIG. 10, the insertion pipe 100 includes, for example, a drain joint 102 and a drain pipe 122.
[0043] <<Drain fitting>> The drain fitting 102 has a fitting body 104, a connector 112, a first nut 115, and a second nut 116. The drain fitting 102 extends in the left-right direction and is included in an example of a first portion that penetrates the first air tank 22 (FIG. 2).
[0044] The joint body 104 is formed in a cylindrical shape extending in the left-right direction. A flow path 105 is formed inside the joint body 104. The right end of the flow path 105 is closed, and the left end is open. A plurality of connection holes 106 are formed in the joint body 104. The plurality of connection holes 106 communicate with the flow path 105. In addition, an upper flat surface 107 and a lower flat surface 108 are formed in the joint body 104.
[0045] The upper plane 107 and the lower plane 108 are used to position the insertion tube 100 when the insertion tube 100 is fixed inside the first air tank 22 (FIG. 2). Specifically, when the upper plane 107 and the lower plane 108 are arranged along the front-rear and left-right directions and the upper plane 107 is positioned above the lower plane 108, the insertion tube 100 is positioned in a predetermined attitude.
[0046] An external thread portion 109 is provided on the outer circumferential surface of the left end portion of the joint body 104. In other words, the drain joint 102 has the external thread portion 109. The insertion tube 100 is fixed to the first air tank 22 (FIG. 4) by screwing the external thread portion 109 into the internal thread portion 24B (FIG. 4).
[0047] The connector 112 is formed in a cylindrical shape extending in the left-right direction. A male thread portion 113 is formed on the outer periphery of the right side of the connector 112. A male thread portion 114 is formed on the outer periphery of the left side of the connector 112. The male thread portion 113 can be screwed into a female thread portion provided at the left end of the flow path 105.
[0048] The male thread portion 114 can be screwed into a female thread portion (not shown) of the first nut 115. With a first portion 122A (described later) inserted into the connector 112, the male thread portion 114 is screwed into the first nut 115, thereby fixing the first portion 122A to the connector 112.
[0049] The second nut 116 is rotated relative to the male thread portion 109 of the insertion tube 100 after the male thread portion 109 of the insertion tube 100 is screwed into the female thread portion 24B of the first air tank 22, thereby fixing the insertion tube 100 to the first air tank 22.
[0050] <<Drain piping>> The drain pipe 122 is a pipe that is bent entirely into an L-shape. The drain pipe 122 includes a first portion 122A, a second portion 122B, and a bent portion 122C.
[0051] The first portion 122A extends in the left-right direction and penetrates the cylindrical portion 23 (FIG. 3) of the first air tank 22 in the left-right direction. The first portion 122A is made of a metal member. As an example, the first portion 122A is made of a stainless steel pipe having a cylindrical shape. The first portion 122A can be inserted into the left portion of the connector 112.
[0052] The second portion 122B extends in the vertical direction. The second portion 122B is made of a first member 124 having an elastic cylindrical shape. As an example, the first member 124 is a rubber tube (a member made of rubber) extending in the vertical direction. A connecting tube 125B, which will be described later, can be inserted into the first member 124. A tapered portion 126 having an intersection angle of 45° with the vertical direction is formed at the lower end of the second portion 122B.
[0053] When the lower end of the first member 124 faces the bottom surface 22B (Figure 14) of the first air tank 22, a tapered portion 126 is formed in the first member 124, allowing drain (water) to flow into the inside of the first member 124.
[0054] The bent portion 122C is made of a second member 125 made of metal. The second member 125 is, for example, a stainless steel member, and is harder than the first member 124. The second member 125 is made of a curved pipe 125A bent into an arc shape when viewed from the front-rear direction, and a connecting pipe 125B extending downward in the up-down direction from the lower end of the curved pipe 125A. The bent portion 122C connects the first portion 122A and the second portion 122B. Note that, for example, the first portion 122A and the bent portion 122C are integrally molded.
[0055] The central axis extending in the left-right direction of the first portion 122A is defined as a first central axis C1. The central axis extending in the up-down direction of the second portion 122B is defined as a second central axis C2. The intersection of the first central axis C1 and the second central axis C2 is defined as a reference point Q.
[0056] As shown in FIG. 11, the distance from the reference point Q to the top-bottom end (lower end) of the second portion 122B is defined as the first distance d1. A part of the inner wall 22A of the first air tank 22 is located at a position overlapping with an imaginary circle RA having a center at the reference point Q and a radius R1 equal to the first distance d1. In other words, when the areas corresponding to the parts of the inner wall 22A are defined as areas P1, P2, P3, and P4 as viewed from the left-right direction, the areas P1, P2, P3, and P4 are located on the imaginary circle RA. The front end (the portion from area P1 to area P2) and the rear end (the portion from area P3 to area P4) of the imaginary circle RA are located outside the inner wall 22A.
[0057] When first air tank 22 is viewed from above and below (in a horizontal plane not shown), a second distance d2 is the distance (shortest distance) from the center point (reference point Q) of cylindrical portion 23 to inner wall 22A of cylindrical portion 23. First distance d1 is greater than second distance d2.
[0058] A bottom surface 22B is a surface located at the lower end in the vertical direction inside the first air tank 22. A third distance d3 corresponding to the shortest distance from the reference point Q to the bottom surface 22B is greater than the second distance d2.
[0059] [Action of this embodiment] The assembly of the insertion tube 100 into the first air tank 22 will be described.
[0060] The second nut 116 shown in Fig. 10 is screwed onto the male thread portion 109. After adhesive is applied to the male thread portion 113, the male thread portion 113 is screwed into the joint body 104. This fixes the connector 112 to the joint body 104. Then, with the right end portion of the first portion 122A inserted into the connector 112, the first nut 115 is screwed in.
[0061] The connecting pipe 125B is inserted into the upper part of the first member 124. Then, the upper part of the first member 124 and the connecting pipe 125B are fixed with a cable tie (not shown). In this manner, the drain pipe 122 is attached to the drain joint 102, and the insertion pipe 100 is completed.
[0062] As shown in Fig. 4, the drain pipe 122 is inserted into the through hole 24A of the first air tank 22. Specifically, after the first member 124 is inserted into the through hole 24A, the drain joint 102 is lifted upward. Then, while rotating the entire insertion tube 100, the male threaded portion 109 is screwed into the female threaded portion 24B. The amount of screwing of the male threaded portion 109 can be determined by the operator by checking the position of a marker (not shown) formed on the joint body 104.
[0063] 12 and 13, when the first member 124 comes into contact with the inner wall 22A of the first air tank 22 while the insertion tube 100 is being screwed in, the first member 124 is elastically deformed. This prevents the first member 124 from getting caught on the inner wall 22A, allowing the screwing operation of the insertion tube 100 to continue. When the first member 124 separates from the inner wall 22A, it returns to its original shape due to a restoring force.
[0064] 14 and 15, when the insertion tube 100 is screwed in a predetermined amount in the left-right direction, the joint body 104 is held using a jig (not shown) so that the upper flat surface 107 and the lower flat surface 108 (FIG. 14) are aligned in the front-rear direction and the left-right direction. Then, the second nut 116 is tightened toward the cylindrical portion 23, whereby the insertion tube 100 is fixed to the first air tank 22.
[0065] Here, the first member 124 is disposed in the vertical direction inside the first air tank 22 by positioning the upper flat surface 107 and the lower flat surface 108. The tapered portion 126 opens toward the bottom surface 22B. This allows the drain W (FIG. 14) stored in the bottom surface 22B of the first air tank 22 to be discharged to the outside of the first air tank 22 via the insertion tube 100 by receiving the pressure inside the first air tank 22.
[0066] <Summary> The operation of each part of the air compressor 10 will be summarized below with reference to Fig. 1 to Fig. 15. Note that individual reference numbers will be omitted. Also, explanations of the second air tank 32, the third air tank 34, and the fourth air tank 36 will be omitted.
[0067] In the air compressor 10, drainage W generated from the compressed air A accumulates inside the first air tank 22. The drainage W inside the first air tank 22 is discharged from the second portion 122B through the bent portion 122C and the first portion 122A to the outside of the first air tank 22. Here, in order to facilitate the discharge of the drainage W, if a configuration is adopted in which the lower end of the second portion 122B of the insertion tube 100 contacts the inner wall 22A of the first air tank 22, the second portion 122B has elasticity, so that damage to the inner wall 22A of the first air tank 22 can be suppressed.
[0068] Furthermore, in the air compressor 10, the hardness of the bent portion 122C of the insertion tube 100 is higher than the hardness of the second portion 122B. This makes it difficult for the bent portion 122C to be crushed by the pressure inside the first air tank 22, so that it is possible to prevent the drain W from being retained midway through the insertion tube 100. In this way, it is possible to improve the convenience of the air compressor 10.
[0069] According to the air compressor 10, the insertion tube 100 can be attached to the first air tank 22 by screwing (relatively rotating) the insertion tube 100 into the first air tank 22. This allows for lower costs compared to a configuration in which the insertion tube 100 is welded to the first air tank 22. Furthermore, by screwing the male thread portion 109 while engaging with the female thread portion 24B, when the second portion 122B comes into contact with the inner wall 22A of the first air tank 22, the second portion 122B is elastically deformed in the rotational direction. This makes it difficult to restrict the rotation (threading operation) of the insertion tube 100, making it easier to attach the insertion tube 100 to the first air tank 22.
[0070] In the air compressor 10, a part of the inner wall 22A of the first air tank 22 is located at a position overlapping with the imaginary circle RA. That is, the elastic second part 122B has a length that makes contact with the inner wall 22A of the first air tank 22 when the insertion tube 100 is screwed into the first air tank 22. As a result, when the second part 122B is arranged along the vertical direction, the tip of the second part 122B (the lower end in the vertical direction) can be brought close to the lower end (the bottom surface 22B) inside the first air tank 22.
[0071] In the air compressor 10, the first distance d1 is greater than the second distance d2, so that the tip (lower end) of the second portion 122B can be brought closer to the lower end inside the first air tank 22. This makes it possible to easily discharge the drain W accumulated at the lower end of the first air tank 22 to the outside, even if the first air tank 22 is configured to be long in the vertical direction.
[0072] In the air compressor 10, the capacity of the first air tank 22 is larger than in a configuration in which the third distance d3 is smaller than the second distance d2.
[0073] In the air compressor 10, the first member 124 is a rubber member, and therefore the first member 124 is less likely to be plastically deformed compared to when the first member 124 is a resin member.
[0074] In the air compressor 10, the second member 125 is a metal member, and therefore the second member 125 is less likely to deform due to the pressure inside the first air tank 22, compared to when the second member 125 is a resin member.
[0075] In the air compressor 10, the first portion 122A is made of a metal member. This makes it possible to prevent a part of the first portion 122A from tilting downward in the up-down direction due to the effect of its own weight, compared to a configuration in which the first portion 122A is made of a resin or rubber member.
[0076] [Modifications of this embodiment] The present embodiment is not limited to the above embodiment, and various modifications are possible without departing from the spirit and scope of the present invention. Modifications of the present embodiment will be described below.
[0077] The number of air tanks as the tank section in the air compressor 10 is not limited to four, and may be one, two, three, or five or more. The compression section 40 is not limited to one that performs compression in two stages, and may be one that performs compression in one stage, or three or more stages. A plurality of insertion tubes 100 may be provided in one air tank.
[0078] The insertion tube 100 may be fixed to the first air tank 22 only by engaging the male thread portion 109 with the female thread portion 24B, without using the second nut 116. Also, an adhesive may be used between the male thread portion 109 and the female thread portion 24B.
[0079] A portion of the inner wall 22A of the first air tank 22 does not have to be in a position that overlaps with the imaginary circle RA that has the reference point Q as its center.
[0080] The first distance d1 may be equal to or less than the second distance d2, and the third distance d3 may be equal to or less than the second distance d2.
[0081] The first member 124 may be an elastically deformable resin member. The second member 125 may be a hard resin member. The first portion 122A may be made of a resin member. [Explanation of symbols]
[0082] 10...air compressor, 12...main body frame, 14...operation panel, 16...handle, 18...legs, 20...tank unit, 22...first air tank, 22A...inner wall, 22B...bottom surface, 23...cylindrical portion, 24...first mounting portion, 24A...through hole, 24B...female thread portion, 25...second mounting portion, 26...third mounting portion, 27...lower cover portion, 28...upper cover portion, 32...second air tank, 34...third air tank, 36...fourth air tank, 40...compression portion, 42...first pressure Compression section, 43A...cylinder, 43B...piston, 44...second compression section, 45A...cylinder, 45B...piston, 46...motor, 48...eccentric shaft, 52...battery pack, 54...power plug, 56...cooling fan, 58...connection section, 62...pressure reducing valve, 63...dial, 64...coupler, 65...piping section, 66...first pipe, 67...second pipe, 68...third pipe, 69...fourth pipe, 71...fifth pipe, 72...discharge pipe section, 73...discharge pipe, 74...discharge pipe, 75... discharge pipe, 77... external discharge pipe, 78... drain cock, 80... control unit, 82... power supply control unit, 84... pressure sensor, 86... operation circuit, 88... drive circuit, 92... rotation detection circuit, 94... AC power supply unit, 96... DC power supply unit, 100... insertion tube, 102... drain joint, 104... joint body, 105... flow path, 106... connection hole, 107... upper flat surface, 108... lower flat surface, 109... male thread portion, 112... connector, 113... male thread portion, 114... male thread portion, 115...first nut, 116...second nut, 122...drain pipe, 122A...first portion, 122B...second portion, 122C...bent portion, 124...first member, 125...second member, 125A...curved pipe, 125B...connecting pipe, 126...tapered portion, A...compressed air, C...central axis, C1...first central axis, C2...second central axis, d1...first distance, d2...second distance, d3...third distance, M...installation surface, Q...reference point, R1...radius, RA...imaginary circle, W...drain
Claims
1. A tank section for storing compressed air; A compression unit that delivers compressed air to the tank unit; an insertion pipe that communicates the inside and outside of the tank portion; The insertion tube is a first portion extending along a horizontal direction perpendicular to a vertical direction and penetrating the tank portion; A second portion extending along the vertical direction; a bent portion connecting the first portion and the second portion, The second portion is made of a first member having elasticity, The bending portion is made of a second member having a harder hardness than the first member.
2. The first portion has an external thread, The tank portion has a female thread portion, The insertion tube is fixed to the tank portion by engaging the male thread portion with the female thread portion. The work machine according to claim 1.
3. an intersection point of a first central axis of the first portion extending in the horizontal direction and a second central axis of the second portion extending in the vertical direction is set as a reference point; A distance from the reference point to a tip end of the second portion in the vertical direction is defined as a first distance, A portion of the inner wall of the tank portion is located at a position overlapping with a virtual circle having a center at the reference point and a radius equal to the first distance. The work machine according to claim 2.
4. The tank portion includes a cylindrical portion extending in the vertical direction and having both ends in the vertical direction closed, A distance from a center of the cylindrical portion to an inner wall of the cylindrical portion when viewed from the vertical direction is defined as a second distance, The first distance is greater than the second distance. The work machine according to claim 3.
5. a surface located at the lower end of the tank portion in the vertical direction on the inside of the tank portion is defined as a bottom surface; a third distance from the reference point to the bottom surface is greater than the second distance; A work machine according to claim 4.
6. The first member is a rubber member. The work machine according to claim 1.
7. The second member is a metal member. The work machine according to claim 1.
8. The first portion is made of a metal member. The work machine according to claim 1.
Citation Information
Patent Citations
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Compressor
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Cooling storage
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