air compressor

Abstract

To more securely suppress leakage of noise and drain which occur in discharge of compressed air by solving the problem that conventional drain discharge structure does not suppress power of the discharged compressed air and drain sufficiently and it is therefore assumed that the leakage of the noise and the drain to the outside through gap for penetration of a wall portion occur in discharge of the compressed air and the drain.SOLUTION: A socket 25 is interposed halfway in a drain discharge pipe 21. A downstream pipe 26 is inserted laterally into an insertion hole 25f of the socket 25 on an outer face side of a partition plate 3. The gap between the downstream pipe 26 and insertion hole 25F is sealed with a sealing member 27. The downstream pipe 26 is allowed to enter a soundproof chamber 30 arranged inside the partition plate 3. Consequently, the leakage, to the outside of the partition plate 3, of the drain and compressed air discharged to the soundproof chamber 30 are suppressed.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to an air compressor that compresses introduced air to generate compressed air.

Background Art

[0002] An air compressor includes a compression mechanism that introduces outside air into a cylinder and compresses it with a piston to generate compressed air. The generated compressed air is sent to a tank and stored. The compressed air stored in the tank is supplied to tools, for example, to drive air-driven nail guns and air tackers. When supplying the compressed air outside the tank, the compressed air remaining in the tank expands and cools. As a result, the water vapor contained in the compressed air remaining in the tank condenses and accumulates as drain (drain water) in the tank. The drain accumulated in the tank may cause rust or the like in the tank or a decrease in the storage amount of the compressed air. Therefore, as described in Patent Document 1, a configuration including a drain discharge portion for discharging the drain outside the tank is generally used in air compressors.

[0003] The drain discharge portion described in Patent Document 1 has a drain discharge pipe communicating with the inside of the tank and a drain cock for opening and closing the drain discharge pipe. By opening the drain cock, the compressed air and drain in the tank are discharged from the discharge port at the tip of the drain discharge pipe. The drain discharge pipe is piped, for example, through a wall portion connecting two tanks and provided in a soundproof chamber below the compressor body. A soundproof member is accommodated in the soundproof chamber. Thereby, the noise of the compressed air discharged from the discharge port of the drain discharge pipe is suppressed, and the scattering of the drain discharged from the discharge port is suppressed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] However, in conventional soundproofing chambers, the force of the discharged compressed air and drain is not sufficiently suppressed, so it is anticipated that noise from the exhaust of compressed air and drain will leak to the outside through gaps in the wall. This disclosure aims to more reliably suppress noise and drain leakage during exhaust. [Means for solving the problem]

[0006] According to one aspect of this disclosure, an air compressor has, for example, two tanks that store compressed air discharged from a compressor and are arranged side by side. The air compressor has, for example, a partition plate provided between the two tanks and covering the space between the two tanks. The air compressor has, for example, a discharge pipe extending from the tanks to discharge drain, and a socket mounted on the outer surface of the partition plate and having a through hole through which the discharge pipe is inserted. The air compressor has, for example, a sealing member that seals the space between the inner circumferential surface of the through hole in the socket and the discharge pipe. The air compressor has, for example, a soundproofing chamber located inside the partition plate and through which the end of the discharge pipe is inserted.

[0007] Therefore, the gap between the inner surface of the insertion hole and the discharge pipe is sealed by the sealing member, which suppresses noise during exhaust and drain leakage. [Brief explanation of the drawing]

[0008] [Figure 1] This is a front view of the air compressor. [Figure 2] This is a front view of the air compressor with the main cover removed. [Figure 3] This is a view from arrow III in Figure 1, and is a front view of the drain outlet. [Figure 4] This is a longitudinal cross-sectional view of the drain outlet. This figure shows the drain lever in the closed position. [Figure 5]This is a longitudinal cross-sectional view of the drain outlet. This figure shows the drain lever in the open position. [Figure 6] This is a disassembled cross-sectional perspective view of the drain outlet section. [Figure 7] This is a longitudinal cross-sectional view of the drain outlet. This diagram shows the state with an adapter installed in place of the downstream pipe. [Modes for carrying out the invention]

[0009] In one or more embodiments, for example, two tanks are arranged side by side, left to right, with a partition plate standing upright relative to the air compressor mounting surface, and the discharge pipe passing through the partition plate and socket in the front-to-back direction. Therefore, the discharge pipe can be attached and detached while the air compressor remains installed. This improves the ease of assembly and maintenance of the discharge pipe.

[0010] In one or more embodiments, for example, the soundproofing chamber has a main body with an opening that opens downwards, and a lower cover that covers the opening and forms a discharge gap between it and the main body. Thus, drain water is discharged through the discharge gap, and splashing into the surroundings is suppressed.

[0011] In one or more embodiments, for example, a sound-absorbing member is housed in a sound-absorbing chamber. Therefore, the exhaust noise of the drain is more reliably suppressed. For example, steel wool can be used as the sound-absorbing member.

[0012] In one or more embodiments, for example, the socket has a cylindrical portion through which the discharge pipe is inserted, and connecting portions located on both sides of the cylindrical portion and connected to the outer surface of the partition plate. Thus, with the discharge pipe inserted through the cylindrical portion, the socket is connected to the outer surface of the partition plate.

[0013] In one or more embodiments, for example, the discharge pipe is provided with an on-off valve and a lever for operating the on-off valve, with the lever positioned above the socket. This improves operability when draining the condensate.

[0014] In one or more embodiments, for example, the entire lever is positioned within the area between the two tanks. This prevents accidental opening or closing of the lever.

[0015] In one or more embodiments, for example, the discharge pipe has an upstream pipe extending from the tank and a downstream pipe detachably connected to the upstream pipe. For example, an adapter can be connected to the upstream pipe instead of the downstream pipe. For example, the adapter has a mounting portion that attaches to the socket and an opening that opens to the outside of the socket. Thus, the drain can be discharged to the outside of the socket instead of into the soundproofing chamber. For example, by connecting a hose to the opening of the adapter, the drain can be easily collected at a location away from the air compressor. Since the downstream pipe is connected so that it passes through the partition plate and the socket in the front-to-back direction, the downstream pipe and adapter can be attached to and detached from the socket while the air compressor is installed. [Examples]

[0016] Next, one embodiment of the present disclosure will be described with reference to Figures 1 to 7. As shown in Figures 1 to 3, the air compressor 1 has two substantially cylindrical tanks 2 that extend in the front-rear direction. The two tanks 2 are arranged side by side and connected to each other by a connecting base 2a. The gap between the two tanks 2 is covered by front and rear partition plates 3. The front and rear partition plates 3 are connected across the two tanks 2. In Figure 1, the front partition plate 3 is visible. Above the two tanks 2, a compressor body 10 is provided. The compressor body 10 is supported on the connecting base. The compressor body 10 is covered by a substantially box-shaped body cover 4 that is open at the bottom.

[0017] Legs 5 are provided at the lower front and rear ends of the two tanks 2. The four legs 5 support the two tanks 2 and the compressor body 10, so that the air compressor 1 is installed on the ground, floor, or other installation surface F. In the following description, the vertical direction is defined as the side of the installation surface F being downwards, and the front-to-back direction is defined as the side where the drain discharge section 20 (described later) is provided being forward. The left-to-right direction is defined based on the air compressor 1 as viewed from the front.

[0018] Above the main body cover 4, a loop-shaped handle 7 is provided. The handle 7 is supported by the compressor main body 10 and extends along the front-rear direction. By gripping the handle 7, the air compressor 1 can be carried. On the upper surface of the main body cover 4 and in front of the handle 7, an operation unit 6 for operating the air compressor 1 is provided. In the operation unit 6, in addition to the start button 6a, various operation buttons are arranged. By turning on and off the start button 6a, the air compressor 1 is started and stopped.

[0019] On the front side of the main body cover 4, two outlets 8 for low-pressure output and two outlets 9 for high-pressure output are arranged on the left and right respectively. From the left high-pressure output outlet 8, compressed air at, for example, 2.5 MPa is supplied. From the right low-pressure output outlet 9, compressed air at, for example, 1 MPa is supplied. The air pressure of the discharged compressed air can be adjusted by the adjustment dials 8a, 9a.

[0020] As shown in FIG. 2, when the main body cover 4 is removed, the compressor main body 10 is exposed. The compressor main body 10 has a first compression part 11 on the front side and a second compression part 12 on the rear side. Pistons are installed in the first compression part 11 and the second compression part 12 respectively.

[0021] A drive part 13 is arranged between the first compression part 11 and the second compression part 12. An electric motor 14 is arranged on the right side of the drive part 13. A brushless motor that can obtain a relatively large starting torque is used for the electric motor 14. A cooling fan 15 is supported at the right end of the output shaft of the electric motor 14. An intake fan 18 is supported on the output shaft of the drive part 13 on the side opposite to the electric motor 14.

[0022] The crank operation of the drive unit 13, initiated by the electric motor 14, causes the pistons of the first compression unit 11 and the second compression unit 12 to reciprocate, performing alternating compression. Outside air is introduced into the front first compression unit 11 to generate compressed air at a constant pressure. The compressed air generated in the front first compression unit 11 is supplied to the rear second compression unit 12 via the air piping 16. The supplied compressed air is further compressed in the second compression unit 12 to generate compressed air at a higher pressure (e.g., 4.5 MPa). The generated compressed air is stored in the right-side tank 2 via the air piping 17. The right-side tank 2 and the left-side tank 2 are connected to each other via a connecting pipe not visible in the diagram.

[0023] The drain (condensate water) generated in the two tanks 2 is discharged through the drain discharge section 20. The drain is discharged mixed with compressed air. As shown in Figures 3 to 6, the drain discharge section 20 is located on the front side (outer side) of the front partition plate 3.

[0024] The drain discharge section 20 has a drain discharge pipe 21 that discharges compressed air and drain from the tank 2. As shown in Figure 3, an upstream pipe 22 is connected to the tank 2 on the left. The upstream pipe 22 corresponds to the upstream side of the drain discharge pipe 21. The upstream pipe 22 is connected to an L-shaped joint 23. The joint 23 is arranged in a path that penetrates from the inside (rear side) to the outside (front side) of the partition plate 3. On the outside of the partition plate 3, an on-off valve 24 is connected to the downstream side of the joint 23. The on-off valve 24 is provided with a lever 24a for opening and closing operation. The drain discharge pipe 21 is opened and closed by rotating the lever 24a within a range of approximately 90°.

[0025] As shown in Figure 4, rotating the lever 24a to a horizontal position (with the longitudinal direction aligned horizontally) closes the on-off valve 24. When the on-off valve 24 is closed, compressed air and drain in the tank 2 are not discharged from the drain discharge pipe 21. As shown in Figure 5, rotating the lever 24a to a vertical position (with the longitudinal direction aligned vertically) opens the on-off valve 24. When the on-off valve 24 is opened, compressed air and drain in the tank 2 are discharged from the drain discharge pipe 21 according to the amount of opening.

[0026] An L-shaped socket 25 is connected to the downstream side of the on-off valve 24. The socket 25 has an L-shaped cylindrical portion 25a. The cylindrical portion 25a has a vertical portion 25b extending in the vertical direction and a horizontal portion 25c extending in the front-to-back direction. Screw fastening coupling portions 25d are provided on both sides of the cylindrical portion 25a. The socket 25 is fixed to the outer surface (front) of the partition plate 3 by the coupling portions 25d.

[0027] The upper part of the vertical section 25b is connected to the on-off valve 24. The inner circumference hole 25e of the vertical section 25b is in communication with the on-off valve 24. In this embodiment, the vertical section 25b constitutes a part of the drain discharge pipe 21.

[0028] An insertion hole 25f is provided along the center of the horizontal portion 25c. The downstream pipe 26 is detachably inserted into the insertion hole 25f. The downstream pipe 26 is provided with a male threaded portion 26a. A female threaded portion 25g is provided in the insertion hole 25f. The downstream pipe 26 is attached in the state of being inserted into the insertion hole 25f by screwing together the male threaded portion 26a and the female threaded portion 25g. The front of the downstream pipe 26 is provided with a hexagonal head 26c for wrench gripping.

[0029] The downstream pipe 26 is inserted into the insertion hole 25f in a nearly horizontal position, from the front to the rear of the horizontal section 25c. The inner circumference hole 26b of the inserted downstream pipe 26 communicates with the inner circumference hole 25e of the vertical section 25b. Compressed air and drain are discharged from the inner circumference hole 26b of the downstream pipe 26. In this embodiment, the downstream pipe 26 constitutes the downstream side of the drain discharge pipe 21.

[0030] Multiple sealing members 27 are attached around the downstream pipe 26. The sealing members 27 seal the space between the inner surface of the insertion hole 25f and the downstream pipe 26. This prevents compressed air discharge noise and drain from leaking outside the partition plate 3. The downstream pipe 26 can be removed from the insertion hole 25f by moving it forward.

[0031] The lateral section 25c penetrates the partition plate 3 from front to back through the insertion hole 3a of the partition plate 3. Therefore, the tip of the downstream pipe 26 protrudes inward (rearward) of the partition plate 3. The gap between the insertion hole 3a of the partition plate 3 and the lateral section 25c is kept to a minimum. As a result, the insertion hole 3a is almost completely sealed by the lateral section 25c. This also suppresses the leakage of compressed air discharge noise and drain to the outside of the partition plate 3.

[0032] A cylindrical sound-absorbing chamber 30 is positioned inside the partition plate 3. The tip of the downstream pipe 26, which protrudes inward from the partition plate 3, is inserted into the sound-absorbing chamber 30. The downstream pipe 26 of the drain discharge pipe 21 extends in the front-to-back direction and is inserted into the sound-absorbing chamber 30 from the side.

[0033] The sound-dampening chamber 30 is open downwards. The sound-dampening chamber 30 is integrally provided with the under cover 32 that covers the lower area between the two tanks 2. The under cover 32 covers almost the entire lower area in the longitudinal direction between the two tanks 2.

[0034] A sound-dampening chamber 30 is provided at the front of the under cover 32. A through-hole 30a is provided at the front of the sound-dampening chamber 30. The tip of the downstream pipe 26 is inserted through the through-hole 30a. A semi-cylindrical guard portion 30b is provided above the through-hole 30a. The guard portion 30b protrudes forward. The guard portion 30b suppresses the leakage of drain and the leakage of compressed air blowing noise.

[0035] The sound-absorbing chamber 30 houses a sound-absorbing member 31. The sound-absorbing member 31 is made of metal wool, which is composed of fine fibrous material intertwined together. The sound-absorbing member 31 can be, for example, steel wool made from iron or stainless steel wool made from stainless steel. The sound-absorbing member 31 has many fine gaps that can disperse the airflow passing through it. In addition, the sound-absorbing member 31 has high water permeability (water permeability, drainage) and extremely low water absorption (water retention). The sound-absorbing member 31 is filled into the sound-absorbing chamber 30 so as to cover at least the area around the insertion hole 30a.

[0036] The lower opening of the sound-absorbing chamber 30 is closed by the lower cover 33. The lower cover 33 prevents the sound-absorbing member 31 from falling out of the sound-absorbing chamber 30. The lower cover 33 has a disc shape. Multiple wall portions 33a are provided on the upper surface of the lower cover 33. The multiple wall portions 33a are arranged radially and each protrudes upward. The multiple wall portions 33a hold the sound-absorbing member 31 in a position with an appropriate gap from the upper surface of the lower cover 33.

[0037] A drain channel 33b for the drain is formed between two adjacent wall sections 33a. The lower cover 33 is joined by three screws 34 to close the opening of the soundproofing chamber 30. When the lower cover 33 is installed, a gap is created between the periphery of the lower cover 33 and the opening edge of the soundproofing chamber 30. This allows each drain channel 33b to communicate with the outside. The drain is discharged to the outside of the soundproofing chamber 30 through each drain channel 33b.

[0038] By loosening the connection between the male threaded portion 26a and the female threaded portion 25g, the downstream pipe 26 can be pulled forward from the insertion hole 25f. This removes the downstream pipe 26 from the socket 25. Consequently, the downstream pipe 26 is removed from the sound-dampening chamber 30.

[0039] As shown in Figure 7, an adapter 40 can be installed in place of the downstream pipe 26 in the insertion hole 25f of the socket 25. The male threaded portion 40a of the adapter 40 is screwed into the female threaded portion 25g of the socket 25, thereby installing the adapter 40 in the insertion hole 25f. Similar to the downstream pipe 26, a sealing member 28 is attached to the outer circumference of the adapter 40. This ensures a watertight seal between the adapter 40 and the insertion hole 25f.

[0040] When the adapter 40 is installed in place of the downstream pipe 26, the rear opening of the insertion hole 25f is blocked by the adapter 40. Therefore, when the adapter 40 is installed, the sound-absorbing chamber 30 is not used. Consequently, as shown in the figure, in this case the sound-absorbing member 31 can be removed from the sound-absorbing chamber 30.

[0041] The inner circumferential hole 40b of the adapter 40 communicates with the inner circumferential hole 25e of the socket 25. The inner circumferential hole 40b of the adapter 40 opens to the front. A drain hose 42 is connected to the inner circumferential hole 40b via a fitting 41. The drain hose 42 is connected to the socket 25 via the adapter 40. As a result, compressed air and drain are discharged from the drain hose 42. By connecting a sufficiently long drain hose 42, compressed air and drain can be discharged to a location away from the air compressor 1.

[0042] According to the embodiment described above, at the point where the drain discharge pipe 21 penetrates the partition plate 3 from the outside to the inside, the gap between the inner surface of the insertion hole 25f of the socket 25 and the downstream pipe 26 (drain discharge pipe 21) is sealed by the sealing member 27. This suppresses noise and leakage of drain to the outside when compressed air and drain are discharged inside the partition plate 3.

[0043] According to the embodiment, the drain discharge pipe 21 (downstream pipe 26) is installed so as to penetrate the partition plate 3 and socket 25, which are upright relative to the installation surface F of the air compressor 1, in the front-to-back (sideways) direction. Therefore, the drain discharge pipe 21 can be installed and removed while the air compressor 1 remains installed. This improves the ease of assembly and maintenance of the drain discharge pipe 21.

[0044] In this embodiment, compressed air and drain are discharged into the sound-absorbing chamber 30 via the downstream pipe 26. The sound-absorbing chamber 30 opens downwards via the drainage channel 33b. Therefore, the drain discharged into the sound-absorbing chamber 30 is discharged through the drainage channel 33b, suppressing scattering into the surrounding area.

[0045] According to the embodiment, the sound-absorbing member 31 is housed in the sound-absorbing chamber 30. Therefore, the exhaust noise of the drain is suppressed more reliably.

[0046] According to the embodiment, the socket 25 has a cylindrical portion 25a through which the drain discharge pipe 21 (downstream pipe 26) is inserted, and connecting portions 25d located on both sides of the cylindrical portion 25a and connected to the outer surface of the partition plate 3. Therefore, with the drain discharge pipe 21 inserted through the cylindrical portion 25a, the socket 25 is connected to the outer surface of the partition plate 3.

[0047] According to the embodiment, the drain discharge pipe 21 has an on-off valve 24 equipped with a lever 24a for opening and closing operation. The lever 24a is located above the socket 25. Therefore, the operability of the lever 24a during drain discharge is improved.

[0048] In this embodiment, the lever 24a of the on-off valve 24 is positioned within the area between the two tanks 2. Therefore, interference with other components with respect to the lever 24a is avoided, preventing unintentional on-off operation.

[0049] According to the embodiment, the adapter 40 can be connected to the socket 25 instead of the downstream pipe 26. Therefore, the drain can be discharged to the outside of the partition plate 3 instead of inside the soundproofing chamber 30. By connecting a drain hose 42 of sufficient length to the opening of the adapter 40, the drain can be easily collected at a location away from the air compressor 1.

[0050] Similar to the downstream pipe 26, the adapter 40 is attached and detached by moving it in the front-to-back direction relative to the insertion hole 25f of the socket 25. This allows the adapter 40 to be attached to and detached from the socket 25 while the air compressor 1 remains installed. Consequently, the maintainability of the air compressor 1 is improved.

[0051] Various modifications can be made to the embodiments described above. For example, although the drain discharge section 20 was shown as being provided on the front partition plate 3, it may also be provided on the rear side of the rear partition plate. Furthermore, the illustrated drain discharge section 20 can be similarly applied to one partition plate 3 or three or more partition plates.

[0052] Furthermore, the sound-absorbing member 31 may be made of, for example, glass wool made of glass fibers instead of steel wool. Also, the sound-absorbing member is not limited to fibrous material; for example, a porous material with many fine gaps formed by sintering a plurality of small metal spheres may also be used.

[0053] The adapter 40, which can be installed in place of the downstream pipe 26, may be omitted. Therefore, it may also be used as a drain discharge section that constantly discharges into a sound-absorbing chamber 30 located between the two tanks 2. In this case as well, the sealing member 27 ensures the airtightness of the downstream pipe 26, thereby reducing noise and drain leakage during discharge, and also facilitating the removal of the downstream pipe 26, thereby improving the maintainability of the air compressor 1.

[0054] The air compressor 1 in the embodiment is an example of an air compressor in one aspect of the present disclosure. The compressor body 10 in the embodiment is an example of a compressor in one aspect of the present disclosure. The tank 2 in the embodiment is an example of a tank in one aspect of the present disclosure. The partition plate 3 in the embodiment is an example of a partition plate in one aspect of the present disclosure. The drain discharge pipe 21 in the embodiment is an example of a discharge pipe in one aspect of the present disclosure.

[0055] The socket 25 in the embodiment is an example of a socket in one aspect of the present disclosure. The through hole 25f in the embodiment is an example of a through hole in one aspect of the present disclosure. The sealing members 27 and 28 in the embodiment are examples of sealing members in one aspect of the present disclosure. The soundproofing chamber 30 in the embodiment is an example of a soundproofing chamber in one aspect of the present disclosure. [Explanation of Symbols]

[0056] F…Installation surface 1… Air compressor 2... Tank 2a…Connecting base 3… Partition board 3a…Through hole 4…Main unit cover 5...legs 6...Operation unit 6a... Start button 7...Handle 8…Discharge port (for high-voltage output) 9…Discharge port (for low-pressure output) 10... Compressor unit 11...First Compression Section 12...Second Compression Section 13…Drive unit 14… Electric motor 15…Cooling fan 16,17…Air piping 18…Intake fan 20... Drain discharge section 21... Drain discharge pipe 22...Upstream pipe 23... Joint 24… Shut-off valve 24a... Lever 25…Socket 25a...cylindrical part, 25b...vertical part, 25c...horizontal part, 25d...joint part 25e...Inner circumference hole, 25f...Through hole, 25g...Female thread section 26…Downstream pipe 26a...male thread, 26b...inner hole, 26c...head 27...Sealing member (downstream pipe 26) 28...Sealing component (adapter 40) 30…Sound reduction room 30a... Through hole, 30b... Guard part 31…Sound-absorbing material 32... Undercover 33... Lower cover 33a...wall, 33b...drainage channel 34... screw 40…Adapter 40a...Male threaded portion, 40b...Inner circumference hole 41... Joint 42... Drain hose

Claims

1. It is an air compressor, Two tanks, arranged side-by-side, store the compressed air discharged from the compressor, A partition plate is provided between the two tanks and covers the space between the two tanks, A discharge pipe extending from the aforementioned tank for discharging drain, A socket attached to the outer surface of the partition plate and having a through hole through which the discharge pipe is inserted, A sealing member that seals the space between the inner circumferential surface of the insertion hole of the socket and the discharge pipe, It has a sound-dampening chamber located inside the partition plate and through which the tip of the discharge pipe is inserted, The discharge pipe has an upstream pipe extending from the tank and a downstream pipe detachably connected to the upstream pipe via a socket. The downstream pipe is an air compressor that is detachably inserted into the insertion hole of the socket.

2. An air compressor according to claim 1, The two tanks are arranged side by side, one to the left and one to the right. The partition plate stands upright relative to the installation surface of the air compressor. The discharge pipe is an air compressor that penetrates the partition plate and the socket in the front-to-back direction.

3. An air compressor according to claim 1 or 2, The sound-dampening chamber is an air compressor having a main body with an opening that opens downwards, and a lower cover that covers the opening and forms a discharge gap between it and the main body.

4. An air compressor according to claim 1 or 2, An air compressor having a sound-absorbing member housed in the aforementioned sound-absorbing chamber.

5. An air compressor according to claim 1 or 2, The socket is an air compressor having a cylindrical portion through which the discharge pipe is inserted, and connecting portions located on both sides of the cylindrical portion and connected to the outer surface of the partition plate.

6. An air compressor according to claim 1 or 2, The air compressor is provided with an on / off valve and a lever for operating the on / off valve in the discharge pipe, and the lever is located above the socket.

7. The air compressor according to claim 6, An air compressor in which the entire lever is positioned within the region between the two tanks.

8. An air compressor according to claim 1 or 2, The downstream pipe has an adapter that is connected to the upstream pipe, The adapter is an air compressor having a mounting portion that is attached to the socket and an opening that opens to the outside of the socket.

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