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 technology]

[0002] An air compressor has a compression mechanism that generates compressed air by introducing outside air into a cylinder and compressing it with a piston. The generated compressed air is sent to a tank and stored. The compressed air stored in the tank is supplied to a tool, such as an air-driven nailer or an air tacker, to drive the tool. When the compressed air is supplied to the outside of the tank, the compressed air remaining in the tank expands and cools. This causes water vapor contained in the compressed air remaining in the tank to condense and accumulate as drain (drain water) in the tank. The drain accumulated in the tank may cause rust or the like in the tank or cause a reduction in the amount of stored compressed air. For this reason, as described in Patent Document 1, a configuration in which an air compressor is provided with a drain discharge section for discharging the drain outside the tank is generally used.

[0003] The drain discharge section 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 outlet at the tip of the drain discharge pipe. The drain discharge pipe is piped, for example, through a wall portion connecting two tanks to each other, to a sound-absorbing chamber provided below the compressor body. A sound-absorbing member is accommodated in the sound-absorbing chamber. This suppresses the noise of the compressed air discharged from the outlet of the drain discharge pipe, and also suppresses the scattering of the drain discharged from the outlet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-157791 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in a conventional sound-absorbing chamber, the momentum of the exhausted compressed air and drainage is not sufficiently suppressed, so it is expected that the noise generated when the compressed air is exhausted and the drainage will leak to the outside through the gap for passing through the wall. The present disclosure aims to more reliably suppress the noise generated when the exhaust is exhausted and the leakage of drainage. [Means for solving the problem]

[0006] According to one aspect of the present disclosure, an air compressor has, for example, two tanks arranged side by side to store compressed air discharged from a compressor. The air compressor has, for example, a partition plate arranged between the two tanks and covering the space between the two tanks. The air compressor has, for example, a discharge pipe extending from the tank to discharge drain, and a socket attached to the outer surface of the partition plate and having an insertion hole through which the discharge pipe is inserted. The air compressor has, for example, a seal member that seals between the inner circumferential surface of the insertion hole of the socket and the discharge pipe. The air compressor has, for example, a sound-proof chamber located inside the partition plate and through which the tip of the discharge pipe is inserted.

[0007] Therefore, the gap between the inner peripheral surface of the insertion hole and the exhaust pipe is sealed by the seal member, thereby suppressing noise during exhaust and drain leakage. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a front perspective view of the air compressor. [Diagram 2] FIG. 2 is a front perspective view of the air compressor with the body cover removed. [Diagram 3] 3 is a view taken along the line III in FIG. 1, showing a front view of the drain discharge portion. [Figure 4] Fig. 2 is a vertical cross-sectional view of the drain discharge section, showing the drain lever in a closed state. [Diagram 5]Fig. 2 is a vertical cross-sectional view of the drain discharge section, showing the drain lever in an open state. [Figure 6] FIG. 2 is an exploded sectional perspective view of a drain discharge portion. [Figure 7] 1 is a vertical cross-sectional view of the drain discharge section, showing a state in which an adapter is attached in place of the downstream pipe. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In one or more embodiments, for example, the two tanks are arranged side by side, and the partition plate stands upright relative to the installation surface of the air compressor, and the discharge pipe passes through the partition plate and the socket in the front-rear direction. Therefore, the discharge pipe can be attached and detached while the air compressor is installed. This improves the ease of installation and maintenance of the discharge pipe.

[0010] In one or more embodiments, for example, the sound absorbing chamber has a main body with an opening that opens downward, and a lower cover that covers the opening and forms a discharge gap between the main body and the lower cover. Therefore, the drain is discharged from the discharge gap and scattering to the surroundings is suppressed.

[0011] In one or more embodiments, for example, a sound-absorbing member is housed in the sound-absorbing chamber. Therefore, the exhaust sound 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 coupling portions located on both sides of the cylindrical portion and coupled to the outer surface of the partition plate, so that the socket is coupled to the outer surface of the partition plate with the discharge pipe inserted through the cylindrical portion.

[0013] In one or more embodiments, for example, the drain pipe is provided with an on-off valve and a lever for operating the on-off valve, and the lever is located above the socket, thereby improving operability when discharging the drain.

[0014] In one or more embodiments, for example, the lever is located entirely within the area between the two tanks, thus preventing inadvertent opening and 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 an attachment portion that is attached to the socket and an opening that opens to the outside of the socket. Therefore, the drain can be discharged to the outside of the socket, not 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. By connecting the downstream pipe in a state where it penetrates the partition plate and the socket in the front-rear direction, the downstream pipe and the adapter can be attached to and detached from the socket while the air compressor is installed. EXAMPLES

[0016] Next, an embodiment of the present disclosure will be described with reference to Figs. 1 to 7. As shown in Figs. 1 to 3, an air compressor 1 has two tanks 2 that are substantially cylindrical and extend in the front-rear direction. The two tanks 2 are arranged side-by-side on the left and right, and are 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. The front partition plate 3 is visible in Fig. 1. A compressor body 10 is provided above the two tanks 2. 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 downward.

[0017] Legs 5 are provided at the bottom of both the front and rear ends of the two tanks 2. The four legs 5 support the two tanks 2 and the compressor body 10, allowing the air compressor 1 to be installed on an installation surface F such as the ground or a floor. In the following description, the up-down direction refers to the installation surface F side as the bottom, and the front-to-rear direction refers to the side where a drain discharge unit 20 (described later) is provided as the front. The left-right direction is defined based on the air compressor 1 viewed from the front.

[0018] A loop-shaped handle 7 is provided above the main body cover 4. The handle 7 is supported by the compressor body 10 and extends in the front-to-rear direction. The air compressor 1 can be carried by gripping the handle 7. An operation unit 6 for operating the air compressor 1 is provided on the top surface of the main body cover 4, in front of the handle 7. The operation unit 6 has a start button 6a and various other operation buttons arranged on it. The air compressor 1 is started and stopped by turning the start button 6a on and off.

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

[0020] As shown in Fig. 2, when the body cover 4 is removed, the compressor body 10 is exposed. The compressor body 10 has a first compression section 11 on the front side and a second compression section 12 on the rear side. The first compression section 11 and the second compression section 12 each have a piston installed therein.

[0021] A drive unit 13 is disposed between the first compression unit 11 and the second compression unit 12. An electric motor 14 is disposed on the right side of the drive unit 13. A brushless motor capable of obtaining a relatively large starting torque is used for the electric motor 14. A cooling fan 15 is supported on 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 unit 13 on the opposite side to the electric motor 14.

[0022] The crank operation of the drive section 13, which is performed by starting the electric motor 14, causes the pistons of the first compression section 11 and the second compression section 12 to reciprocate, thereby performing alternate compression operations. Outside air is introduced into the front first compression section 11 to generate compressed air at a constant pressure. The compressed air compressed and generated in the front first compression section 11 is supplied to the rear second compression section 12 via air piping 16. The supplied compressed air is further compressed in the second compression section 12 to generate compressed air at a higher pressure (for example, 4.5 MPa). The generated compressed air is stored in the right tank 2 via air piping 17. The right tank 2 and the left tank 2 are connected to each other via a communication pipe that is not visible in the figure.

[0023] Drain (drain water) generated in the two tanks 2 is discharged at the drain discharge section 20. The drain is discharged together with compressed air. As shown in Figs. 3 to 6, the drain discharge section 20 is provided on the front side (outer surface side) of the front partition plate 3.

[0024] The drain discharge section 20 has a drain discharge pipe 21 that discharges the compressed air and drainage in the tank 2. As shown in FIG. 3, an upstream pipe 22 is connected to the left tank 2. 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) of the partition plate 3 to the outside (front side). On the outside of the partition plate 3, an opening / closing valve 24 is connected to the downstream side of the joint 23. The opening / closing valve 24 is provided with a lever 24a for opening and closing. The drain discharge pipe 21 is opened and closed by rotating the lever 24a within a range of approximately 90°.

[0025] As shown in Fig. 4, when the lever 24a is rotated to a horizontal position (a position in which the longitudinal direction is aligned with the left-right direction), the on-off valve 24 is closed. When the on-off valve 24 is closed, the compressed air and drainage in the tank 2 are not discharged from the drain discharge pipe 21. As shown in Fig. 5, when the lever 24a is rotated to a vertical position (a position in which the longitudinal direction is aligned with the up-down direction), the on-off valve 24 is opened. When the on-off valve 24 is opened, the compressed air and drainage 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 up-down direction and a horizontal portion 25c extending in the front-rear direction. Joining portions 25d for screw fastening are provided on both sides of the cylindrical portion 25a. The socket 25 is fixed to the outer surface (front surface) of the partition plate 3 by the joining portions 25d.

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

[0028] An insertion hole 25f is provided along the center of horizontal portion 25c. Downstream pipe 26 is detachably inserted through insertion hole 25f. Downstream pipe 26 is provided with male threads 26a. Insertion hole 25f is provided with female threads 25g. Downstream pipe 26 is attached in a state where it is inserted through insertion hole 25f by screwing male threads 26a and female threads 25g together. A hexagonal head 26c for use with a wrench is provided at the front of downstream pipe 26.

[0029] The downstream pipe 26 is inserted from the front to the rear of the horizontal portion 25c into the insertion hole 25f in a substantially horizontal position. The inner peripheral hole 26b of the inserted downstream pipe 26 is connected to the inner peripheral hole 25e of the vertical portion 25b. Compressed air and drain are discharged from the inner peripheral 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] A plurality of seal members 27 are attached around downstream pipe 26. Seal members 27 seal the gap between the inner peripheral surface of insertion hole 25f and downstream pipe 26. This prevents exhaust sound (noise) of compressed air and drain from leaking out to the outside of partition plate 3. Downstream pipe 26 can be removed from insertion hole 25f by moving it forward.

[0031] The horizontal portion 25c penetrates the partition plate 3 in the front-rear direction through the insertion hole 3a of the partition plate 3. Therefore, the tip side 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 horizontal portion 25c is minimized. As a result, the insertion hole 3a is blocked by the horizontal portion 25c with almost no gap. This also prevents the discharge sound (noise) of compressed air and drain from leaking out to the outside of the partition plate 3.

[0032] A cylindrical silencing chamber 30 is disposed inside the partition plate 3. The tip of the downstream pipe 26 protruding inward from the partition plate 3 is inserted into the silencing chamber 30. The downstream pipe 26 of the drain discharge pipe 21 extends in the front-rear direction and is inserted laterally into the silencing chamber 30.

[0033] The sound-absorbing chamber 30 is open downward. The sound-absorbing chamber 30 is provided integrally with an undercover 32 that covers the lower part between the two tanks 2. The lower part of almost the entire area between the two tanks 2 in the longitudinal direction is covered by the undercover 32.

[0034] A sound-absorbing chamber 30 is provided in the front part of the undercover 32. An insertion hole 30a is provided in the front part of the sound-absorbing chamber 30. The tip of the downstream pipe 26 is inserted into the insertion hole 30a. A semi-cylindrical guard portion 30b is provided above the insertion hole 30a. The guard portion 30b protrudes forward. The guard portion 30b prevents leakage of drain and the sound of compressed air being blown out.

[0035] The sound deadening chamber 30 contains a sound deadening member 31. The sound deadening member 31 is made of metal wool in which fine fibrous members are intertwined. The sound deadening member 31 is, for example, steel wool made of iron or stainless wool made of stainless steel. The sound deadening member 31 has many fine gaps that can disperse the air flow passing through it. The sound deadening member 31 has high water permeability (water permeability, drainage ability) and extremely low water absorption (water retention). The sound deadening member 31 is filled in the sound deadening chamber 30 so as to cover at least the periphery of the insertion hole 30a.

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

[0037] A drainage channel 33b for the drain is formed between two adjacent wall portions 33a. The lower cover 33 is attached to the sound-absorbing chamber 30 by three screws 34 so as to close the opening of the sound-absorbing chamber 30. When the lower cover 33 is attached, a gap is provided between the periphery of the lower cover 33 and the edge of the opening of the sound-absorbing chamber 30. This allows each drainage channel 33b to communicate with the outside. The drain is discharged to the outside of the sound-absorbing chamber 30 through each drainage channel 33b.

[0038] By loosening the screw engagement between the male thread portion 26a and the female thread portion 25g, the downstream pipe 26 can be pulled out forward from the insertion hole 25f. This allows the downstream pipe 26 to be removed from the socket 25. Thus, the downstream pipe 26 is pulled out from the silencing chamber 30.

[0039] 7, an adapter 40 can be attached to the insertion hole 25f of the socket 25 in place of the downstream pipe 26. The male threaded portion 40a of the adapter 40 is screwed into the female threaded portion 25g of the socket 25 to attach the adapter 40 to the insertion hole 25f. As with the downstream pipe 26, a seal member 28 is attached to the outer periphery of the adapter 40. This provides a watertight seal between the adapter 40 and the insertion hole 25f.

[0040] When the adapter 40 is attached 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 attached, the silencing chamber 30 is not used. Therefore, in this case, the silencing member 31 can be removed from the silencing chamber 30 as shown in the figure.

[0041] The inner peripheral hole 40b of the adapter 40 is connected to the inner peripheral hole 25e of the socket 25. The inner peripheral hole 40b of the adapter 40 is open to the front side. A drain hose 42 is connected to the inner peripheral hole 40b via a joint 41. The drain hose 42 is connected to the socket 25 via the adapter 40. Thus, compressed air and drain are discharged from the drain hose 42. By connecting a sufficiently long drain hose 42, the 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 portion where the drain discharge pipe 21 penetrates from the outside to the inside of the partition plate 3, the gap between the inner peripheral surface of the insertion hole 25f of the socket 25 and the downstream pipe 26 (the drain discharge pipe 21) is sealed by the seal member 27. This suppresses noise generated when the compressed air and drain are discharged inside the partition plate 3 and leakage of the drain to the outside.

[0043] According to the embodiment, the drain discharge pipe 21 (downstream pipe 26) is attached in a state in which it penetrates in the front-rear direction (lateral direction) through the partition plate 3 and the socket 25, which stand upright relative to the installation surface F of the air compressor 1. Therefore, the drain discharge pipe 21 can be attached and detached while the air compressor 1 is in the installed state. This improves the ease of assembly and maintenance of the drain discharge pipe 21.

[0044] According to this embodiment, the compressed air and drain are discharged into the silencing chamber 30 via the downstream pipe 26. The silencing chamber 30 opens downward through the drainage channel 33b. Therefore, the drain discharged into the silencing chamber 30 is discharged from the drainage channel 33b, and scattering to the surroundings is suppressed.

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

[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 coupling portions 25d located on both sides of the cylindrical portion 25a and coupled to the outer surface of the partition plate 3. Therefore, the socket 25 is coupled to the outer surface of the partition plate 3 with the drain discharge pipe 21 inserted through the cylindrical portion 25a.

[0047] According to the embodiment, the drain discharge pipe 21 has an opening / closing valve 24 equipped with a lever 24a for opening and closing. The lever 24a is located above the socket 25. This improves the operability of the lever 24a when discharging the drain.

[0048] According to the embodiment, the lever 24a of the opening / closing valve 24 is disposed within the region between the two tanks 2. Therefore, interference with the lever 24a by other members is avoided, and inadvertent opening and closing operations are prevented.

[0049] According to the embodiment, an 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, not into the sound-absorbing 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] Like the downstream pipe 26, the adapter 40 is attached to and detached from the insertion hole 25f of the socket 25 by moving it in the front-rear direction. This allows the adapter 40 to be attached to and detached from the socket 25 while the air compressor 1 is still installed. This improves the ease of maintenance of the air compressor 1.

[0051] Various modifications can be made to the embodiment described above. For example, although the drain discharge section 20 is provided on the front partition plate 3, it may be provided on the rear side of the rear partition plate. The drain discharge section 20 illustrated can be applied to one partition plate 3 or three or more partition plates in the same manner.

[0052] Furthermore, the sound deadening member 31 may be made of so-called glass wool made of glass fiber instead of steel wool. Also, the sound deadening member is not limited to a fibrous member, and may be a porous member with many fine gaps formed by sintering a number of small metal balls.

[0053] The adapter 40 that can be attached in place of the downstream pipe 26 may be omitted. Therefore, the drain may be discharged constantly into the sound-absorbing chamber 30 disposed between the two tanks 2. Even in this case, the sealing member 27 ensures the airtightness of the downstream pipe 26, thereby reducing noise during discharge and reducing drain leakage, and the downstream pipe 26 can be easily removed, improving the maintainability of the air compressor 1.

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

[0055] The socket 25 of the embodiment is an example of a socket in one aspect of the present disclosure. The insertion hole 25f of the embodiment is an example of an insertion hole in one aspect of the present disclosure. The seal members 27 and 28 of the embodiment are an example of a seal member in one aspect of the present disclosure. The sound-absorbing chamber 30 of the embodiment is an example of a sound-absorbing chamber in one aspect of the present disclosure. [Explanation of symbols]

[0056] F…Installation surface 1. Air compressor 2. Tank 2a…Consolidated basis 3…Partition plate 3a...Through hole 4…Main unit cover 5...legs 6...Operation unit 6a…Start button 7…Handle 8...Outlet (for high pressure output) 9…Outlet (for low pressure output) 10…Compressor body 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 hole, 25f: Through hole, 25g: Female thread 26…Downstream pipe 26a...male thread, 26b...inner hole, 26c...head 27...Seal member (downstream pipe 26) 28...Sealing member (adapter 40) 30…Sound reduction room 30a...insertion hole, 30b...guard portion 31...Sound deadening material 32…Undercover 33…Lower cover 33a...wall, 33b...drainage channel 34…Screw 40…Adapter 40a...male thread portion, 40b...inner peripheral hole 41...Joint 42…Drain hose

Claims

1. An air compressor, comprising: two tanks that store compressed air discharged from a compressor and are arranged side by side with each other; a partition plate provided between the two tanks and covering the space between the two tanks; a discharge pipe extending from the tank to discharge drain; a socket mounted on the outer surface of the partition plate and having an insertion hole through which the discharge pipe is inserted; a seal member for sealing between the inner peripheral surface of the insertion hole of the socket and the discharge pipe; an air compressor having a soundproof chamber located inside the partition plate and into which the tip of the discharge pipe is inserted.

2. The air compressor according to Claim 1, wherein: the two tanks are arranged side by side horizontally with each other; the partition plate stands upright with respect to the installation surface of the air compressor; the discharge pipe penetrates the partition plate and the socket in the front-rear direction.

3. The air compressor according to Claim 1 or 2, wherein: the soundproof chamber has a main body with an opening that opens downward, and a lower cover that covers the opening and forms a discharge gap between the main body and the lower cover.

4. The air compressor according to Claim 1 or 2, further comprising: a soundproof member housed in the soundproof chamber.

5. The air compressor according to Claim 1 or 2, wherein: the socket has a cylindrical portion through which the discharge pipe is inserted, and coupling portions located on both sides of the cylindrical portion and coupled to the outer surface of the partition plate.

6. The air compressor according to Claim 1 or 2, wherein: a shut-off valve and a lever for operating the shut-off valve are provided on the discharge pipe, and the lever is located above the socket.

7. The air compressor according to Claim 6, wherein: the entire lever is arranged within the region between the two tanks.

8. The air compressor according to Claim 1 or 2, wherein: the discharge pipe has an upstream pipe extending from the tank and a downstream pipe detachably connected to the upstream pipe; an adapter connected to the upstream pipe instead of the downstream pipe; the adapter has a mounting portion for mounting on the socket and an opening that opens to the outside of the socket.

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