JP2012159030A - Air compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air compressor that facilitates transportation.SOLUTION: The air compressor 1 includes: a compressed air production part for producing compressed air; a driving part having an electric motor which drives the compressed air production part; a cylindrical air tank for storing the compressed air produced by the compressed air production part; and lower covers 170a and 170b that is connected to an auxiliary tank 212 positioned below the air tank and storing the compressed air in communication with the air tank so as to be detachable by a bolt 175 and a nut 176 and is disposed on a lower part of the air tank.

Description

  The present invention relates to a portable air compressor that supplies compressed air to a pneumatic tool such as a nail driver.

  Conventionally, an air tank provided in a portable air compressor that supplies compressed air to a pneumatic tool has been reduced in size and weight, so that air compression is required in operations that require a large amount of compressed air temporarily. By connecting a separate auxiliary tank to the air tank provided in the machine, the lack of capacity of the air tank is compensated. As a configuration in which such an auxiliary tank is provided in the air compressor, Patent Document 1 discloses a configuration in which the auxiliary tank is mounted on a mounting table provided above the air compressor by being engaged with a handle portion of the air compressor. Is described.

JP 2000-249072 A

  However, in the configuration described in Patent Document 1, it is necessary to transport the air compressor, the auxiliary tank, and the mounting table separately to the work site.

  This invention is made | formed in view of this problem, Comprising: It aims at providing the air compressor which can be conveyed easily.

In order to achieve the above object, an air compressor according to the present invention includes:
A compressed air generating section for generating compressed air;
A drive unit having an electric motor for driving the compressed air generation unit;
A cylindrical air tank for storing the compressed air generated by the compressed air generation unit;
A lower cover that is positioned below the air tank and is detachably connected to an auxiliary tank that communicates with the air tank and stores compressed air; and is provided at a lower portion of the air tank;
It is characterized by providing.

  The lower cover may have a lower recess that is recessed inwardly over the outer periphery of the lower cover.

  The compressed air generating unit, the driving unit, and the air tank are covered from above, have a substantially rectangular outline when viewed from above, and the full length of at least one side of the long side part and the short side part forming the outline You may further provide the upper cover which has an upper side recessed part dented below.

  The lower cover may have handle portions provided at both ends in the longitudinal direction of the air tank.

A lower portion of the lower cover, further comprising a leg portion provided inside the handle portion in the longitudinal direction of the air tank;
The handle portion is configured such that when the air compressor is tilted with respect to the mounting surface such that the leg portion and the handle portion are in contact with the mounting surface of the air compressor, the air compressor is stationary. The lower cover may extend downward from both ends in the longitudinal direction of the air tank to such an extent that the state can be maintained.

The lower cover includes an outer wall portion extending downward from both longitudinal end portions of the air tank, a leg connecting portion extending downward from the outer wall portion and connected to the leg portion. And an upper wall portion connecting the outer wall portion and the leg connecting portion,
The upper wall portion may have a protruding portion that protrudes downward.

  ADVANTAGE OF THE INVENTION According to this invention, the air compressor which can be conveyed easily can be provided.

It is a front view in the state where the auxiliary tank part of the air compressor concerning the embodiment of the present invention was expanded. It is a side view in the state where the auxiliary tank part of the air compressor concerning the embodiment of the present invention was expanded. It is a front view of the air compressor concerning an embodiment of the present invention. It is a side view of the air compressor concerning an embodiment of the present invention. It is a bottom view of the air compressor concerning an embodiment of the present invention. FIG. 5 is a cross-sectional view taken along a cutting line BB in FIG. 4. (A) And (b) is the front view and side view of an air compressor for demonstrating the winding pattern of cords. FIG. 3 is a cross-sectional view taken along a cutting line AA in FIG. 2. It is a front view of the air compressor in the state inclined with respect to the mounting surface. It is a top view of an auxiliary tank part. It is a side view of an auxiliary tank part.

  Embodiments of the present invention will be described with reference to the drawings. FIG.1 and FIG.2 is the front view and side view in the state to which the auxiliary tank part 2 of the air compressor 1 which concerns on embodiment of this invention was expanded. As shown in FIG.1 and FIG.2, the air compressor 1 which concerns on this embodiment can add the auxiliary tank part 2 to the downward direction. Hereinafter, each of the air compressor 1 and the auxiliary tank unit 2 will be described in detail.

  3 to 5 are a front view, a side view, and a bottom view of the air compressor 1 in a state where the auxiliary tank portion 2 is not added. As shown in FIGS. 3 to 5, the air compressor 1 includes a compressed air generation unit 110, a driving unit 120, an air tank 130, a compressed air extraction unit 140, a control circuit unit 150, and an upper cover 160. The lower covers 170a and 170b and the legs 180 are configured. In the following description, in a state where the air compressor 1 is suspended by gripping a handle 161 described later, the direction from the air tank 130 toward the handle 161 is the upward direction, and the opposite direction is the downward direction. . In addition, a direction from the drive unit 120 toward the compressed air generation unit 110 is a forward direction (right direction in FIG. 4), and the opposite direction is a rear direction.

  The compressed air generation unit 110 generates compressed air by reciprocating the piston in the cylinder by the drive unit 120 and compressing the air drawn into the cylinder from the intake valve of the cylinder. The compressed air generation unit 110 is provided above the air tank 130 such that the sliding direction of the piston and the longitudinal direction of the air tank 130 substantially coincide.

  Specifically, as shown in FIG. 3, the compressed air generation unit 110 includes a first-stage compression device 111 and a second-stage compression device 112, and the first-stage compression device 111 and the second-stage compression device. 112 is arranged so as to be opposed to each other through the crankcase 113. The first stage compression device 111 compresses the external air (atmospheric pressure) that flows in through the crankcase 113 and supplies the compressed air to the second stage compression device 112 via the first stage discharge pipe 114. To do. The second-stage compression device 112 compresses the compressed air supplied from the first-stage compression device 111 to an allowable maximum pressure of, for example, 3.0 to 4.5 MPa, and an air tank through the second-stage discharge pipe 115. Compressed air is supplied to 130.

  The drive unit 120 includes an electric motor 121 that drives the compressed air generation unit 110 and a cooling fan 122 that is attached to the rotation shaft of the electric motor 121, and is connected via a crank shaft that is attached to the rotation shaft of the electric motor 121. The piston of the compressed air generation unit 110 is reciprocated. As will be described later, the cooling fan 122 cools the compressed air generator 110, the electric motor 121, and the like. In addition, the drive unit 120 is controlled by the control circuit unit 150 to start and stop its operation.

  The air tank 130 stores the compressed air generated by the compressed air generation unit 110, and is constituted by a cylindrical tank as shown in FIGS. The compressed air generated by the compressed air generation unit 110 and supplied via the second-stage discharge pipe 115 has a pressure of, for example, 3.0 to 4.5 MPa in the air tank 130.

  In addition, a drain discharge device 131 for discharging drain or compressed air accumulated in the air tank 130 to the outside of the air tank 130 is provided at the lower part of the air tank 130. The drain discharge device 131 has a drain discharge port that is opened and closed by manual operation of the drain cock 132. Then, by operating the drain cock 132, the drain and compressed air in the air tank 130 are simultaneously discharged to the outside via the flow path inside the drain discharge device 131.

  In addition, tank frames 133 that connect the air tank 130 to the upper cover 160 and the lower covers 170a and 170b are provided at the lower portions of both ends in the longitudinal direction of the air tank 130, respectively. The tank frame 133 is attached to the air tank 130 by welding. FIG. 6 is a cross-sectional view of the tank frame 133 taken along the cutting line BB in FIG. As shown in FIG. 6, the tank frame 133 includes an upper connection portion 133a, a contact portion 133b, and a lower connection portion 133c. The upper connection portion 133a is located inside the lower edge portion of the upper cover 160, and is connected to the upper cover 160 via the upper edge portion of the lower cover 170a by a bolt 134a and a nut 135a. The contact portion 133b is formed so as to bend and extend inward from the upper connection portion 133a, and the lower surface thereof contacts the upper wall portion 173 of the lower cover 170a. The lower connection portion 133c is formed to bend and extend downward from the contact portion 133b, and is connected to the lower cover 170a by a bolt 134b and a nut 135b. Although the configuration of the tank frame 133 connected to the lower cover 170a has been described, the tank frame 133 connected to the lower cover 170b is also configured in the same manner.

  The compressed air extraction unit 140 is for extracting compressed air stored in the air tank 130. As shown in FIG. 3, the compressed air extraction unit 140 includes a joint pipe 141, pressure reducing valves 142a and 142b, pressure gauges 143a and 143b, and couplers 144a and 144b.

  The joint pipe 141 is a pipe that is screwed into a female thread portion formed on the side surface portion of the air tank 130 and has a bifurcated flow path for supplying compressed air in the air tank 130 to the couplers 144a and 144b. is there. Pressure reducing valves 142a and 142b are connected to both ends of the joint pipe 141 which are divided into two forks.

  The pressure reducing valves 142a and 142b are for reducing the compressed air supplied from the air tank 130 to a predetermined pressure. Specifically, the pressure reducing valves 142a, 142b include pressure adjusting handles 145a, 145b for adjusting the pressure of compressed air taken out from the couplers 144a, 144b. The pressure reducing valves 142a and 142b are configured to adjust the pressure of the compressed air on the couplers 144a and 144b (downstream side) to the pressure adjusting handle 145a, regardless of the pressure of the compressed air on the air tank 130 side (upstream side). The pressure is reduced to the pressure adjusted by 145b.

  The pressure gauges 143a and 143b measure pressures near the couplers 144a and 144b. The pressure gauges 143a and 143b are connected to the downstream side of the pressure reducing valves 142a and 142b via socket holders 146a and 146b.

  The couplers 144a and 144b are compressed air outlets for supplying compressed air from the air tank 130 to an air tool (not shown) via an air hose (not shown). The couplers 144a and 144b are connected to the socket holders 146a and 146b, and supply compressed air decompressed by the pressure reducing valves 142a and 142b to an air tool connected via an air hose.

  The control circuit unit 150 controls the driving unit 120. Specifically, the control circuit unit 150 includes a power switch 151 for performing ON / OFF operation of the power of the drive unit 120, and various circuits such as a power supply circuit and a drive circuit housed in the control circuit case. Is done.

  The upper cover 160 is formed so as to cover the compressed air generation unit 110, the drive unit 120, the air tank 130, the compressed air extraction unit 140, and the control circuit unit 150 from above. A handle 161 that is gripped by the carrier when the air compressor 1 is transported is provided on the top of the upper cover 160. Further, the lower edge portion of the upper cover 160 is connected to the tank frame 133 via the upper edge portion of the lower cover 170 by bolts 134a and nuts 135a.

  The upper cover 160 has a substantially rectangular outline when viewed from above, and upper recesses 162 that are recessed downward over the entire length of the two short sides that form the outline are formed on both sides of the handle 161, respectively. Has been. As shown in FIG. 7A, the upper concave portion 162 holds the cords when the cords such as an air hose and a power cord are wound around and stored in the upper cover 160 and the lower covers 170a and 170b.

  The lower covers 170a and 170b are two covers that respectively cover the lower portions of both ends of the air tank 130 in the longitudinal direction. As shown in FIG. 6, the lower cover 170 a includes a leg connecting portion 171, an outer wall portion 172, and an upper wall portion 173. The leg connecting portion 171, the outer wall portion 172, and the upper wall portion 173 form a lower concave portion 174 that is recessed inward over the outer periphery of the lower cover 170 a. In addition, although the structure of the lower cover 170a is demonstrated below, the lower cover 170b is also comprised similarly to the lower cover 170a.

  The leg connecting part 171 is a part connected to the leg part 180. The leg connecting portion 171 is formed so as to extend downward from both end portions of the air tank 130, and its bottom surface is connected to the leg portion 180 by a bolt 182.

  Further, the leg connecting portion 171 is formed with a hole 171a having a substantially rectangular cross section and opening upward. The lower connection portion 133c of the tank frame 133 is inserted into the hole 171a.

  In addition, a protruding portion 171b protruding outward is formed at the lower edge portion of the leg connecting portion 171. As shown in FIGS. 7A and 7B, the protruding portion 171b is arranged such that the cords C2 wound so as to wind both the leg connecting portions 171 of the lower covers 170a and 170b are positioned in the lower concave portion 174. Further, the downward movement of the cords C2 is restricted.

  Further, as shown in FIG. 8 which is a cross-sectional view taken along the cutting line AA of FIG. 4 and FIG. 2, the leg connecting portion 171 has a through-hole 171c formed substantially parallel to the longitudinal direction of the air tank 130. Is formed. Bolts 175 for connecting the lower covers 170a and 170b and the connecting portions 221 and 222 of the auxiliary tank portion 2 are inserted into the through holes 171c.

  The outer wall portion 172 is formed to extend downward from the lower edge portion of the upper cover 160. As shown in FIG. 7A, when the cords are wound around the outer wall 172 so that the upper wall 173 of the lower cover 170 and the upper concave portion 162 of the upper cover 160 are wound, The outward movement of the cords is restricted so as to be located in the lower recess 174.

  Further, as shown in FIG. 4, a handle portion 172 a that an operator grips when carrying the air compressor 1 is provided at the center of the outer wall portion 172 when viewed from the longitudinal direction of the air tank 130. Yes. The handle portion 172a is formed to extend downward from the lower edge portion of the upper cover 160 by a predetermined length. As shown in FIG. 9, the predetermined length is such that the air compressor 1 is inclined with respect to the mounting surface so that the lower ends of the leg portion 180 and the handle portion 172a abut on the mounting surface of the air compressor 1. The length of the air compressor 1 is such that the air compressor 1 can remain stationary without falling down.

  As shown in FIG. 4, as viewed from the longitudinal direction of the air tank 130, projecting portions 172 b and 172 c projecting downward are formed at both ends of the outer wall portion 172. As shown in FIG. 7B, when the cords C3 are wound around the protrusions 172b and 172c so that the outer wall 172, the upper wall 173, and the upper cover 160 are wound, The outward movement of the cords is restricted so as to be located in the lower recess 174.

  The upper wall portion 173 is formed so as to connect the leg connecting portion 171 and the outer wall portion 172. The upper surface of the upper wall portion 173 contacts the contact portion 133b of the tank frame 133.

  As shown in FIGS. 3 and 5, when viewed from the longitudinal direction of the air tank 130, projecting portions 173 a and 173 b projecting downward are formed at both ends of the upper wall portion 173. As shown in FIG. 7A, the projecting portions 173a and 173b sandwich the cord C1 in cooperation with the leg connecting portion 171 and the outer wall portion 172 so that the cord C1 is positioned in the lower concave portion 174. Hold on.

  The legs 180 are for mounting the air compressor 1 on the floor, and are positioned at the four corners of the air compressor 1 having a substantially rectangular outline when viewed from below, as shown in FIG. It is provided as follows. The leg portion 180 is formed in a cylindrical shape from a resin material such as rubber, for example. Moreover, the leg part 180 has the through-hole 181 for inserting the volt | bolt 182 as shown in FIG. The leg portion 180 is connected to the leg connecting portion 171 of the lower cover 170 by inserting a bolt 182 into the through-hole 181 through a collar 183 for restricting the tightening height and preventing crushing due to tightening.

  Next, the configuration of the auxiliary tank unit 2 will be described. FIG. 10 is a top view of the auxiliary tank unit 2, and FIG. 11 is a side view of the auxiliary tank unit 2. As shown in FIGS. 10 and 11, the auxiliary tank unit 2 includes two auxiliary tanks 211 and 212 and connection units 221 and 222.

  The auxiliary tanks 211 and 212 communicate with the air tank 130 of the air compressor 1 and store compressed air therein, and are each constituted by a cylindrical tank.

  The connection parts 221 and 222 are parts connected to the lower covers 170 a and 170 b of the air compressor 1. The connection parts 221 and 222 are fixed to the auxiliary tanks 211 and 212 so as to protrude from the upper surfaces of the auxiliary tanks 211 and 212. Further, the connecting portions 221 and 222 have through holes 221a and 222a through which the bolts 175 are inserted. 11 shows only the through hole 221a formed in the connection portion 221, the same through hole 222a is also formed in the connection portion 222. The connecting portions 221 and 222 are connected to the lower covers 170a and 170b by bolts 175 and nuts 176.

  Next, the addition of the auxiliary tank unit 2 in the air compressor 1 configured as described above will be described. The auxiliary tank unit 2 is added to the air compressor 1 when, for example, the amount of compressed air that can be supplied by the air tank 130 of the air compressor 1 is not sufficient for the consumption of compressed air necessary for work. The Thereby, the quantity of the compressed air which can be stored can be increased.

  Specifically, the air compressor 1 is placed above the auxiliary tank unit 2 so that the longitudinal direction of the air tank 130 and the longitudinal directions of the auxiliary tanks 211 and 212 of the auxiliary tank unit 2 coincide. 8, bolts 175 are inserted into the through holes 171c of the lower covers 170a and 170b and the through holes 221a and 222a of the connecting portions 221 and 222 of the auxiliary tank portion 2, and a nut 176 is fastened to the bolt 175. . Then, by connecting the auxiliary tanks 211 and 212 and the air tank 130 with an air hose (not shown), the auxiliary tank unit 2 is added as shown in FIGS.

  Next, winding of the cords in the air compressor 1 configured as described above will be described. For example, there are three patterns for winding the cords as shown in FIGS. 7 (a) and 7 (b). In the first pattern, the longitudinal direction of the air tank 130 is pivoted so that the upper wall portion 173 of the lower cover 170 and the upper concave portion 162 of the upper cover 160 are wound around like the codes C1 shown in FIG. As shown in FIG. The second pattern is that the air compressor 1 is vertically moved so that both leg connecting portions 171 of the lower covers 170a and 170b are wound, as in the cords C2 shown in FIGS. 7 (a) and 7 (b). This is a pattern in which the cords C2 are wound as an axis. The third pattern is a cord with the front-rear direction of the air compressor 1 as an axis so that the outer wall portion 172, the upper wall portion 173, and the upper cover 160 are wound around like the cords C3 shown in FIG. 7B. This is a pattern in which the class C3 is wound.

  As described above, in the air compressor 1 according to the present embodiment, the lower covers 170a and 170b are detachably connected to the auxiliary tank portion 2, the bolt 175, and the nut 176. Therefore, the base for mounting an auxiliary tank is not required, and the air compressor 1 and the auxiliary tank part 2 can be easily conveyed. Moreover, attachment or removal of the auxiliary tank part 2 can be performed easily. Moreover, since the auxiliary tank part 2 is provided below the air compressor 1, it is not necessary to secure a place to install an auxiliary tank separately.

  Further, in the air compressor 1 according to the present embodiment, the lower covers 170a and 170b have a lower recess 174 that is recessed inwardly over the outer periphery. Therefore, the cords can be stored in the lower recess 174 without being bulky. Further, mud or the like adhering to the cords can be prevented from attaching to the clothes of the transporter when the air compressor 1 is transported.

  In the air compressor 1 according to the present embodiment, the upper cover 160 has upper concave portions 162 that are recessed downward on both sides of the handle 161. Therefore, the cords can be wound and stored so as to wind up the upper concave portion 162 and the lower concave portion 174.

  Further, in the air compressor 1 according to the present embodiment, a handle portion 172 is provided on the lower covers 170a and 170b. Therefore, by gripping the handle portion 172 with both hands, the air compressor 1 can be carried so as to hold it, improving the stability and safety of the carrying work, and reducing the feeling of fatigue in the arms and hands. it can.

  Further, in the air compressor 1 according to the present embodiment, the handle portion 172 includes the mounting surface of the air compressor 1 such that the lower ends of the leg portion 180 and the handle portion 172a abut on the mounting surface of the air compressor 1. When the air compressor 1 is tilted, the air compressor 1 extends downward so that the air compressor 1 can be kept stationary without falling down. Therefore, the cords can be easily wound and housed in the lower concave portion 174 with the air compressor 1 tilted as shown in FIG. Further, the air compressor 1 can be prevented from falling when the handle 172 is moved by dragging or pushing the handle 172 while tilting the air compressor 1.

  Moreover, in the air compressor 1 which concerns on this embodiment, the upper wall part 173 has protrusion part 173a, 173b which protrudes below. Therefore, the cords can be sandwiched between the projecting portions 173a and 173b, the leg connecting portion 171 and the outer wall portion 172, and the cords can be held so as to be positioned in the lower concave portion 174.

  In addition, this invention is not limited to said embodiment, A various deformation | transformation and application are possible. For example, in the above embodiment, the air compressor 1 includes the handle 161. However, if the lower covers 170a and 170b have the handle portion 172, the handle 161 may be omitted. Thereby, weight reduction and cost reduction can be achieved.

  In the above-described embodiment, the upper recess 162 is formed over the entire length of the two short sides that form the contour of the upper surface of the upper cover 160. However, the position where the upper concave portion 162 is formed is not limited to this. For example, the upper concave portion 162 may be formed over the entire length of the two long side portions that form the contour of the upper surface of the upper cover 160. Moreover, it may be formed over the entire length of both the short side part and the long side part, or one of the two short side parts, or one of the two long side parts. Thereby, the cords wound together with the lower concave portion 174 can be held.

DESCRIPTION OF SYMBOLS 1 Air compressor 110 Compressed air production | generation part 111 First stage compressor 112 Second stage compressor 113 Crankcase 114 First stage discharge pipe 115 Second stage discharge pipe 120 Drive part 121 Electric motor 122 Cooling fan 130 Air tank 131 Drain Discharge device 132 Drain cock 133 Tank frame 133a Upper connection part 133b Abutting part 133c Lower connection part 134a, 134b Bolts 135a, 135b Nut 140 Compressed air extraction part 141 Joint piping 142a, 142b Pressure reducing valves 143a, 143b Pressure gauges 144a, 144b Couplers 145a and 145b Pressure adjusting handles 146a and 146b Socket holder 150 Control circuit unit 151 Power switch 160 Upper case 161 Handle 162 Upper recesses 170a and 170b Lower cover 171 Leg connection unit 171 Hole 171b Projection 171c Through-hole 172 Outer wall 172a Handle 172b, 172c Projection 173 Upper wall 173a, 173b Projection 174 Lower recess 175 Bolt 176 Nut 180 Leg 181 Through-hole 182 Bolt 2 Auxiliary tank 211, 212 Auxiliary tanks 221 and 222 connecting portions 221a and 222a through holes

Claims (6)

A compressed air generating section for generating compressed air;
A drive unit having an electric motor for driving the compressed air generation unit;
A cylindrical air tank for storing the compressed air generated by the compressed air generation unit;
A lower cover that is located below the air tank and is detachably connected to an auxiliary tank that communicates with the air tank and stores compressed air, and is provided at a lower portion of the air tank;
An air compressor comprising: The lower cover has a lower recess that is recessed inwardly over the outer periphery of the lower cover.
The air compressor according to claim 1. The compressed air generating unit, the driving unit, and the air tank are covered from above, have a substantially rectangular outline when viewed from above, and the full length of at least one side of the long side part and the short side part forming the outline Further comprising an upper cover having an upper recess recessed downward over
The air compressor according to claim 1 or 2, characterized in that. The lower cover has handle portions provided at both ends in the longitudinal direction of the air tank,
The air compressor according to any one of claims 1 to 3, wherein the air compressor is provided. A lower portion of the lower cover, further comprising a leg portion provided inside the handle portion in the longitudinal direction of the air tank;
The handle portion is configured such that when the air compressor is tilted with respect to the mounting surface such that the leg portion and the handle portion are in contact with the mounting surface of the air compressor, the air compressor is stationary. Extending downward from both longitudinal ends of the air tank of the lower cover to such an extent that the state can be maintained,
The air compressor according to claim 4. The lower cover includes an outer wall portion extending downward from both longitudinal end portions of the air tank, a leg connecting portion extending downward from the outer wall portion and connected to the leg portion. And an upper wall portion connecting the outer wall portion and the leg connecting portion,
The upper wall portion has a protruding portion protruding downward.
The air compressor according to claim 5.

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