JP2019023435A - Air compressor - Google Patents

Abstract

To provide an air compressor which inhibits noise and scattering of drain when the drain is discharged.SOLUTION: An air compressor of the invention has a drain pipe 37 which guides compressed air and drain to the bottom surface side of the air compressor when the drain is discharged. Further, the air compressor includes an under guard 21 in an area located at the bottom surface side and between double-barrel air tanks. A drain receiving space 23 having a recessed shape is formed at the under guard. The compressed air and the drain are guided to the inner side of the drain receiving space 23 formed at the under guard and discharged thereat to achieve sound deadening effect and scattering inhibition effect. Further, the air compressor includes a cover 27 which covers the drain receiving space 23. Thus, the cover covers the drain pipe 37 to further achieve the sound deadening effect and scattering inhibition effect. The cover 27 is provided while forming a gap so as to discharge the drain discharged at the drain receiving space 23 to the outside.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an air compressor having a function of reducing noise during drain discharge and suppressing the scattering of drain.

  An air compressor is generally known as a device that supplies compressed air to an air tool such as a nailing machine, and is widely used in various work sites such as construction sites. For example, an air tool such as an air-driven nailing machine is generally used in a construction site or the like, and an air compressor is used as a supply device for compressed air that serves as power.

  Air compressors (air compressors for driving air tools) used at various work sites such as construction sites are carried and used at various sites, so they can be easily lifted and moved by human power. And “mobility” is required. In view of this requirement, a portable air compressor has been proposed by the applicant of the present application.

  As shown in FIG. 8, the conventional portable air compressor has a compressor (air compressor) that is capable of generating high-pressure compressed air provided inside the body cover 3 and stores the generated compressed air. A pair of air tanks 5 and 6 and a pair of carrying handles 15 and 16 are integrally provided.

  The compressor provided in the main body cover 3 is fixed above metal air tanks 5 and 6 provided substantially in parallel like a double cylinder. Like a general air compressor, this compressor includes a crankcase, a cylinder provided in the crankcase, a piston provided in the cylinder, a motor for driving the piston, and a rotor. It has a motor shaft that rotates integrally.

  When the motor of the compressor is driven, the piston connected to the motor shaft reciprocates. The piston repeats a suction stroke for sucking air from the suction chamber into the compression chamber and a compression stroke for compressing the air in the compression chamber and discharging it to the discharge chamber, thereby generating compressed air in the cylinder. The air compressed in the cylinder is discharged through the discharge chamber of the cylinder head and stored in the air tank. High-pressure compressed air stored in the air tanks 5 and 6 based on such a principle is output through a pressure reducing valve or the like, and is used for an air tool such as a nail driver.

  When the air is compressed, the amount of saturated water vapor decreases, so moisture (drain) is generated in the air tank that stores high-pressure compressed air, and the drain is accumulated at the bottom of the air tank. If drain continues to accumulate in the air tank, in addition to causing rust and corrosion to the air tank and piping, problems such as this drain entering the air tool together with the compressed air will cause problems. Therefore, after using the air compressor, it is necessary to perform a drain discharge process in order to drain the drain from the air tank.

  When draining, the drain cock 93 in front of the drain outlet 91 shown in FIG. 8 is opened, and the compressed air and drain in the air tanks 5 and 6 are discharged.

  However, when drain is discharged, the drain is vigorously released to the atmosphere with compressed air. Therefore, if the drain cock 93 is opened at once, the drain is greatly discharged (when the drain is discharged together with the compressed air to the atmosphere). Generate sound. Since this sound reverberates around and becomes a noise, which deteriorates the work environment, conventionally, the drain cock 93 is gradually opened to reduce the noise during drainage. In particular, when there are private houses around the work site, it was necessary to pay attention to the drain cock operation when draining (so as not to open at once) so as not to cause noise damage around the work site. Therefore, the drain discharge process in the conventional air compressor is a troublesome and time-consuming process.

  Moreover, when draining, since compressed air is discharged vigorously with the drain, the drain scatters toward the operator who opened the drain cock 93 and its surroundings. Since the discharged drain contains moisture, rust, etc. in addition to moisture in the atmosphere, pay attention so that the drain does not scatter toward the operator and the surrounding area when draining. There was a need.

  In order to cope with the above-described problem related to the scattering of the drain, the applicant of the present application studied to make the drain discharge port at the tip of the drain cock face down. However, the force of compressed air is so strong that drain scattering occurs due to rebounding. Therefore, simply changing the direction of the drain discharge port has not solved the problem related to drain scattering.

  In view of the above-described problems of the prior art, an object of the present invention is to provide an air compressor having a function of reducing noise during drain discharge and suppressing drain scattering.

The above purpose is
An air tank for storing compressed air generated by the compressor;
A drain discharge device for discharging compressed air and drain in the air tank,
The drain discharge device
A drain cock for opening and closing a flow path for compressed air and drain discharge;
Drain guide means for guiding the compressed air and drain discharged through the flow path to the bottom side of the air compressor,
A drain outlet provided at a tip of the drain guide means;
It is achieved by an air compressor characterized by having

In the above air compressor,
The air tank is composed of a pair of air tanks arranged side by side,
The drain guide means is provided such that the drain discharge port at the tip thereof is located on the bottom side of the air compressor and between a pair of air tanks arranged side by side.

In the above air compressor,
On the bottom side of the air compressor, between the pair of air tanks arranged side by side, an under guard for protecting the air compressor is provided,
The under guard is provided with a drain receiving space for receiving compressed air and drain discharged from the drain discharge port,
The drain guide means is provided such that a drain discharge port at the tip thereof is positioned in the drain receiving space of the under guard.

In the above air compressor,
The under guard is provided with a cover that covers the drain receiving space.
The cover is provided with a gap, for example, so that the drain discharged into the drain receiving space can be discharged to the outside of the drain receiving space.

  Further, in the above air compressor, at least one silencing wall is provided in the drain receiving space of the under guard for reducing noise during drain discharge.

  In the above air compressor, at least one barrier is provided in the drain receiving space of the under guard for attenuating the momentum of the compressed air discharged with the drain.

  In the above air compressor, the drain guide means is provided so that the discharge direction from the drain discharge port at the tip thereof is substantially parallel to the installation surface of the air compressor.

  Further, in the air compressor, the drain receiving space of the under guard has a drain receiving portion that prevents the discharged compressed air and the drain from proceeding (straight forward).

The drain discharge device included in the air compressor according to the present invention includes drain guide means (for example, a joint or a guide pipe) that guides compressed air and drain discharged through the flow path to the bottom surface side of the air compressor. .
Thereby, the compressed air and the drain from the air tank are guided to the bottom surface side of the air compressor by the drain guide means (before being discharged to the atmosphere), and discharged (released to the atmosphere) on this bottom surface side.
Thus, by guiding the compressed air and drain to the bottom surface side of the air compressor, the air is discharged into the atmosphere in the space between the air compressor and its installation surface. And, by draining in the narrow space (space sandwiched in the vertical direction) sandwiched between the air compressor and its installation surface in the vertical direction, the noise reduction effect is demonstrated, so noise during draining is reduced It becomes possible.

The air compressor according to the present invention includes a pair of air tanks arranged in parallel (that is, a twin-cylinder air tank), and the drain guide means has a drain discharge port at the tip thereof on the bottom surface side of the air compressor. And it is arrange | positioned so that it may be located between the air tanks of a twin cylinder.
Since a gap is inevitably generated between the double-tank air tanks, according to the present invention, the gap between the tanks is effective as a space for arranging drain guide means (a space for discharging the drain to the atmosphere). Can be used. For this reason, it is not necessary to change the layout of the twin cylinder air tank, and in principle, no design change is required except for the portion related to drain discharge.
The compressed air and drain are guided and discharged through the gap between the twin cylinders (in addition to the silencing action of the upper and lower air compressors and the installation surface). Can be expected. In other words, the position where the compressed air and drain are discharged is sandwiched between the air compressor and the installation surface in the vertical direction and sandwiched between the twin cylinders in the horizontal direction, effectively reducing noise during drainage. be able to.

In addition, the air compressor according to the present invention is premised on that an under guard is provided between the twin cylinder air tanks, and a drain receiving space (a space for discharging compressed air and drain) is formed in the under guard. ing. The drain guide means guides the compressed air and the drain to the drain receiving space and discharges the compressed air and the drain inside the space.
As described above, the compressed air and the drain are guided to the inside of the drain receiving space formed in the under guard, and then released to the atmosphere, thereby providing a further silencing effect.
Further, in the present invention, since the under guard is also used as the drain receiving means, it is not necessary to provide a member dedicated to the drain receiving (for example, a casing dedicated to the drain receiving), and the manufacturing cost is increased by devising the drain discharging device. Can be avoided.

Moreover, the air compressor which concerns on this invention has provided the cover which covers a drain receiving space in an under guard. Thus, further noise reduction and scattering suppression are exhibited by covering the drain receiving space with the cover.
Further, the cover is not attached to the drain receiving space completely, but is attached with a gap so that the drain discharged in the drain receiving space can be discharged to the outside of the drain receiving space. Thereby, the stay of the drain in the drain receiving space can be prevented.

The air compressor according to the present invention further includes a “silencer wall” in the drain receiving space of the underguard for reducing noise during drain discharge. The sound deadening wall also functions as a “barrier” for attenuating the momentum of the compressed air discharged with the drain.
By providing such a silencing wall (barrier) inside the drain receiving space, it is possible to enhance the silencing function of the drain receiving space, and to suppress the discharge (money discharged) from the drain receiving space. It becomes possible.

  In the present invention, the drain guide means is provided so that the discharge direction from the drain discharge port at the tip thereof is substantially parallel to the installation surface of the air compressor. Thereby, since the raising of the dust etc. which have accumulated on the installation surface of an air compressor can be reduced, the deterioration of the work environment by drain discharge can be reduced.

Moreover, the air compressor which concerns on this invention has the drain receiving part which prevents the progress (straight advance) of the compressed air and drain which were discharged at the terminal of the drain receiving space of an under guard.
The compressed air and drain that are expelled in the drain receiving space collide with the drain receiving portion and the energy is attenuated, so that the compressed air and drain can be prevented from scattering.

In the present invention, the drain guide means may be provided, for example, such that the discharge direction from the drain discharge port at the tip thereof faces the opposite side with respect to the operator of the drain cock. That is, it is possible to arrange the drain guide means so that the discharge direction from the drain discharge port faces the direction away from the drain cock.
Thereby, it is possible to prevent the compressed air and the drain from being scattered toward the operator who operates the drain cock (the user of the air compressor), so that it is possible to reduce damage to the operator due to the drain scattering.
In addition, since it is not necessary for the operator to pay attention not to be directly exposed to compressed air or drain during the drain discharge operation, the drain discharge operation is facilitated.

It is a perspective view which shows the air compressor which concerns on this invention. It is a side view which shows the side surface (side in which the drain cock was provided) of the air compressor which concerns on this invention. It is a bottom view showing the air compressor concerning the present invention, and Drawing 3 (a) shows the state where the drain pipe cover was attached to the under guard, and Drawing 3 (b) removed the drain pipe cover from the under guard Indicates the state. It is the perspective view which looked at the air compressor concerning the present invention from the bottom side. It is the perspective view which looked at the air compressor which concerns on this invention from the bottom face side, Comprising: The state which floated the drain pipe cover from the state shown in FIG. 4 is shown. It is the perspective view which looked at the air compressor which concerns on this invention from the bottom face side, Comprising: The state which floated the under guard and the drain pipe cover from the state shown in FIG. 4 is shown. It is a bottom view which shows the modification of the under guard which an air compressor comprises, Comprising: The state which removed the drain pipe cover from the under guard is shown. It is the perspective view which shows the conventional air compressor, and the elements on larger scale which show the drain cock periphery.

(Configuration of air compressor)
Hereinafter, based on an accompanying drawing, the composition of the air compressor concerning the present invention is explained.

The air compressor according to the present invention is
・ Resin body cover 3;
A compressor covered by the main body cover 3,
A pair of air tanks 5 and 6 for storing compressed air generated by the compressor;
A controller 9 (see FIG. 6) for controlling the motor included in the compressor;
A drain discharge device 13 for discharging compressed air and drain in the air tank;
-It has a pair of handles (handles) 15 and 16 for carrying.

  The compressor provided inside the main body cover 3 bears a frame for generating compressed air. In the accompanying drawings, the compressor is not shown because it is entirely covered with the main body cover 3. Since the specific configuration and functional action of this compressor are the same as those of the conventional air compressor shown in FIG. 8, the detailed description of the compressor is omitted in this embodiment, and the background art is described. Is used.

  The air tank included in the air compressor is composed of a pair of metal air tanks 5 and 6 (a twin air tank), and is arranged in parallel as shown in the figure. The pair of air tanks 5 and 6 are fixed to the frame in a substantially parallel positional relationship. The compressed air generated by the compressor is stored in the pair of air tanks 5 and 6 as in the prior art.

  An under guard 21 for protecting the air compressor is provided between the pair of air tanks 5 and 6 arranged side by side on the bottom side of the air compressor. The under guard 21 is attached to a frame that fixes a pair of air tanks and a compressor thereon.

  The under guard 21 is a member that plays a role of protecting the air compressor. Specifically, the under guard 21 plays a role of protecting the controller 9 (see FIG. 6) provided between the air tanks from dust and drain. ing. The under guard 21 also serves to protect the operator by preventing the operator's finger from entering between the air tanks 5 and 6 by mistake.

  The under guard 21 is provided with a drain receiving space 23 as a configuration relating to drain discharge processing. See FIG. 3 (b) and FIG. The functional action of the drain receiving space 23 will be described later in relation to the configuration of the drain discharge device 13.

(Configuration of drain discharge device)
Next, the configuration of the drain discharge device included in the air compressor will be described based on the attached drawings.

The drain discharge device 13
A flow path for guiding the compressed air and drain in the air tanks 5 and 6 to the drain cock 31,
A drain cock 31 for opening and closing a flow path for guiding compressed air and drain;
A drain guide means 33 connected to the outlet side of the drain cock 31;
A drain outlet 39 located at the tip of the drain guide means 33;
have.

  Although the flow path which guides the compressed air and drain in the air tanks 5 and 6 to the drain cock 31 is not shown, it is composed of, for example, a metal communication pipe or a joint.

  The drain cock 31 is configured to be openable and closable as in the case of a conventional air compressor. As shown in FIG. 2, the drain cock is provided so that the IN port (compressed fluid inlet) faces upward and the OUT port (compressed fluid outlet) faces downward.

  At the position where the drain cock 31 is opened, the above-described flow path (the flow path from the air tank to the drain cock) is opened, and toward the drain guide means 33 (the joint 35 and the drain pipe 37) connected to the drain cock 31. Compressed air and drain are discharged. In the position where the drain cock 31 is closed, the above-described flow path is closed, and the compressed air and drain (if remaining in the air tank) remain trapped in the air tanks 5 and 6.

  In the present embodiment, the drain guide means 33 includes, for example, an L-shaped joint 35 and a metal drain pipe 37. The drain guide means 33 including the joint 35 and the drain pipe 37 is a means for guiding the compressed air and drain discharged through the flow path (flow path from the air tank to the drain cock) to the bottom side of the air compressor. Function.

  One end of the joint 35 of the drain guide means is connected to the OUT port of the drain cock 31 and the other end is connected to the drain pipe 37.

  As shown in FIG. 6, the drain pipe 37 of the drain guide means has a drain discharge port 39 at the tip thereof on the bottom side of the air compressor and is positioned between a pair of air tanks 5 and 6 arranged side by side. It is provided as follows.

  Further, the drain pipe 37 is provided such that the discharge direction from the drain discharge port 39 at the tip thereof (the direction in which compressed air and drain are discharged) is substantially parallel to the installation surface of the air compressor.

  Furthermore, in this embodiment, as an example, the drain pipe 37 is provided so that the drain discharge port 39 at the tip thereof faces the opposite side with respect to the operator who operates the drain cock 31. That is, the joint 35 and the drain pipe 37 are provided so that discharge is performed from the drain discharge port 39 in the direction away from the drain cock 31. Thereby, it is possible to prevent the compressed air and the drain from being scattered toward the operator who operates the drain cock (the user of the air compressor), so that it is possible to reduce damage to the operator due to the drain scattering. In addition, since it is not necessary for the operator to pay attention not to be directly exposed to compressed air or drain during the drain discharge operation, the drain discharge operation is facilitated.

  The configuration of the drain guide means 33 is not necessarily limited to that described above, and any configuration can be used as long as it can guide the compressed air and drain discharged through the flow path to the bottom side of the air compressor. Is possible.

  In the present embodiment, the direction of the drain pipe 37 is set as shown in the accompanying drawings, and the direction of the drain pipe (guide means) is not necessarily limited to this in the present invention. Absent.

(Configuration of under guard)
Next, based on FIGS. 3-6, the structure of the under guard which an air compressor comprises is demonstrated.

  As shown in FIG. 4, there is an under guard 21 (protective member / air compressor protective member) for protecting the air compressor between the pair of air tanks 5 and 6 arranged on the bottom side of the air compressor. ) Is provided. As described above, the under guard 21 mainly serves to protect the controller 9 and the worker.

  As shown in FIG. 5, the under guard 21 is formed with a concave drain receiving space 23 (drain receiving portion) that receives compressed air and drain discharged from a drain discharge port 39 at the drain pipe tip. The drain receiving space 23 is formed inside a concave portion formed on the under guard 21 on the bottom surface side. The drain receiving space 23 functions as a space that suppresses noise during drain discharge and prevents the scattering of drain.

  As shown in FIGS. 3B and 5, the drain pipe 37 of the drain guide means is provided so that the drain discharge port 39 at the tip thereof is located in the drain receiving space 23 of the underguard 21.

  The drain receiving space 23 of the underguard 21 has a partition 25 (drain receiving wall / drain receiving portion) that prevents the progress of the discharged compressed air and drain at the terminal position. The compressed air and drain that are expelled in the drain receiving space 23 collide with the partition 25, and the energy is attenuated. Therefore, the momentum of the compressed air is suppressed and the scattering of the drain can be suppressed.

  The under guard 21 is provided with a drain pipe cover 27 (cover) that covers the drain receiving space 23 and the drain pipe 37. The drain pipe cover 27 is provided so that the drain discharged to the drain receiving space 23 can be discharged to the outside of the drain receiving space. Specifically, as shown in FIGS. 3A and 4, the drain pipe cover 27 is fixed to the under guard 21 by screwing in a state where a drain discharge gap 29 is opened.

  By covering the drain receiving space 23 with the drain pipe cover 27 in this way, the drain discharge port 39 at the tip of the drain pipe is surrounded by the under guard 21 and the drain pipe cover 27 in all directions. Reduction and scattering suppression are demonstrated. Further, by attaching the drain pipe cover 27 with a gap 29 therebetween, it is possible to prevent the drain from staying in the drain receiving space 23.

(Function and effect when draining)
As described above, the air compressor according to the present embodiment is premised on the provision of the underguard 21 between the twin cylinder air tanks 5, 6, and the drain receiving space 23 (compressed air and drain are placed in the underguard 21. A space for discharging) is formed. The drain guide means 33 guides the compressed air and the drain to the drain receiving space 23 and discharges it inside the space.
As described above, the compressed air and the drain are guided to the inside of the drain receiving space 23 formed in the under guard 21 and released to the atmosphere there, thereby exhibiting a silencing effect and a scattering suppressing effect.
Further, in this embodiment, since the under guard 21 is also used as a drain receiving means, it is not necessary to provide a member dedicated to the drain receiving (for example, a casing dedicated to the drain receiving), and the manufacturing cost is increased by devising the drain discharging device. Can be avoided.

(Underguard modification)
A modification of the under guard that can be used in the present invention is shown in FIG.

  In the modification shown in FIG. 7, a silencer wall 26 (baffle plate) is provided in the drain receiving space 23 of the underguard 21 to mitigate noise when draining. The sound deadening wall 26 also functions as a barrier for attenuating the compressed air discharged in the drain receiving space 23 and the kinetic energy (moment to be scattered) of the drain.

  In the modification shown in FIG. 7, a plurality of sound deadening walls (barriers) 26 are provided, but the number is not particularly limited, and at least one is sufficient.

  By providing one or a plurality of such silencing walls 23 (barriers) inside the drain receiving space 23, the silencing function of the drain receiving space 23 can be enhanced, and the draining (spouting) of the drain from the drain receiving space 23. To be suppressed).

3 Body cover 5 Air tank 6 Air tank 9 Controller (control device)
13 Drain discharge device 15 Handle (grip)
16 Handle
21 Under guard (protective member)
23 Drain receiving space (drain receiving chamber / space receiving compressed air and drain / space for silencing and scattering prevention)
25 Partition (drain receiver)
26 Noise barrier (barrier)
27 Drain pipe cover (cover)
29 Gap for drain discharge (gap for discharging compressed air and drain to the outside)
31 Drain cock 33 Drain guide means (guide means / means for guiding compressed air and drain)
35 Joint 37 Drain pipe (Pipe for guiding compressed air and drain)
39 Drain outlet (Compressed air and drain outlet)
91 Drain outlet (Compressed air and drain outlet)
93 Drain cock

Claims (6)

An air tank for storing compressed air generated by the compressor;
A drain discharge device for discharging compressed air and drain in the air tank,
The drain discharge device
A drain cock for opening and closing a flow path for compressed air and drain discharge;
Drain guide means for guiding the compressed air and drain discharged through the flow path to the bottom side of the air compressor,
A drain outlet provided at a tip of the drain guide means;
An air compressor characterized by comprising: The air tank is composed of a pair of air tanks arranged side by side,
The drain guide means is provided so that the drain discharge port at the tip thereof is located on the bottom surface side of the air compressor and between a pair of air tanks arranged in parallel.
The air compressor according to claim 1. On the bottom side of the air compressor, between the pair of air tanks arranged side by side, an under guard for protecting the air compressor is provided,
The under guard is provided with a drain receiving space for receiving compressed air and drain discharged from a drain discharge port,
The drain guide means is provided such that a drain discharge port at a tip thereof is positioned in a drain receiving space of the under guard.
The air compressor according to claim 2. The under guard is provided with a cover that covers the drain receiving space,
The air compressor according to claim 3, wherein the cover is provided so that drain discharged to the drain receiving space can be discharged to the outside of the drain receiving space. In the drain receiving space of the under guard,
At least one silencing wall is provided to mitigate noise when draining;
The air compressor according to claim 3 or 4, characterized in that. In the drain receiving space of the under guard,
The air compressor according to claim 3 or 4, wherein at least one barrier for attenuating the momentum of the compressed air discharged along with the drain is provided.