JP2013107038A - Exhaust port structure for air dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust port structure for an air dryer that can more significantly reduce a chance of getting a stain by a liquid droplet dropped on the air dryer than the prior art when air is discharged from the air dryer when a vehicle is not moving.SOLUTION: The exhaust port structure for an air dryer includes a silencer 5 for suppressing noise generated when air is discharged into an exhaust port 4 provided at the lower part of a dryer body 1, and is mounted with a guide cylinder 7 for preventing moisture containing oil from scattering when air is discharged to the silencer 5. The vertical sectional shape of the lowermost part 10 of the guide cylinder 7 is a sharp-pointed shape with a sharp tip.

Description

  The present invention relates to an exhaust port structure of an air dryer.

  Generally, in a vehicle such as a truck, a compressor that compresses air, an air dryer that dehumidifies compressed air supplied from the compressor, and an air tank that stores the compressed air dehumidified from the air dryer via a check valve. , Mounted mainly to ensure the brake pressure source.

  FIG. 7 is a schematic diagram for explaining the outline of the air dryer. An oil filter is provided in the lower part of the dryer body 1, and a separation cylinder filled with a desiccant is provided in the upper part of the inside. Further, an air introduction port 2 communicating with the compressor is provided on one side of the dryer body 1, and an air supply port 3 communicating with the air tank is provided on the other side.

  When air is supplied from the compressor to the air tank, air is introduced from the compressor into the dryer body 1 through the air introduction port 2 to remove oil from the air through an oil filter and to remove air moisture. After that, air is supplied from the inside of the dryer body 1 to the air tank through the air supply port 3.

  Further, a part of the water removed from the air accumulates at the bottom of the dryer body 1 in a state containing oil, and when the air tank pressure exceeds a set value and the compressor is unloaded, the dryer is removed. The release valve of the main body 1 is automatically opened to open the inside of the separation cylinder. By this, the dry air flows backward to clean the oil filter and the desiccant in the separation cylinder and contain oil. Moisture is released from the exhaust port 4 into the atmosphere via the silencer 5.

  Here, a number of slits 6 are formed around the lower part of the silencer 5 so that air can be diffused and discharged, and a silencer (not shown) is accommodated in the slit 6. The noise generated when air is released into the atmosphere can be reduced as much as possible.

  In the air dryer provided with the silencer 5 as described above, when air is released into the atmosphere, water containing oil is scattered around and the peripheral devices and members on the vehicle side are contaminated with oil. Therefore, in recent years, as a voluntary response within the industry, a guide cylinder 7 is provided in the silencer 5, and the guide cylinder 7 prevents the water containing oil from being scattered around.

  The guide tube 7 can be a separate guide tube 7 made of a rubber or resin hose, or a guide tube 7 molded integrally with the silencer 5. In the example illustrated here, a case where a separate guide cylinder 7 made of a rubber or resin hose is employed is illustrated.

  As prior art document information related to the release of air in this type of air dryer, for example, the following Patent Document 1 and Patent Document 2 already exist.

JP 2005-66470 A No. 7-8020

  However, in such a conventional structure, since the lower end of the guide cylinder 7 is simply cut in a horizontal plane, the guide cylinder is shown in FIG. 8 in the direction of the arrow VIII-VIII in FIG. A horizontal annular end face 8 is formed at the lower end of the nozzle 7, and droplets 9 that have collided with the inner peripheral surface of the guide cylinder 7 when air is released and flow down easily accumulate in a plurality of circumferential directions of the annular end face 8. Each time the discharge is repeated, the liquid gradually grows to become a large droplet 9, and when the vehicle stops and performs a cargo handling operation or the like, a large amount of droplet 9 is generated from the annular end face 8 as a result of the release of new air or the like. Dripping may cause the ground to be heavily soiled over a wide area at the loading / unloading destination of the load.

  For example, if the cargo is loaded into or removed from a factory that handles food and medicine, a market that handles fresh food, medical facilities, etc. Contamination due to the dropping of the droplet 9 has been pointed out as a major problem, and there is an increasing demand for improvement.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an air dryer exhaust port structure capable of significantly reducing contamination caused by dripping of droplets at the time of air discharge of the air dryer in a stationary state. And

  The present invention includes a silencer that is provided in an exhaust port at a lower portion of a dryer body and suppresses noise when air is released, and a guide cylinder that is provided in the silencer and prevents scattering of moisture including oil when air is released. In the exhaust port structure of the air dryer, the longitudinal cross-sectional shape of the lowermost part of the guide cylinder is configured to have a sharpened pointed downward shape.

  Thus, in this way, the vertical cross-sectional shape of the lowermost portion of the guide tube becomes a sharp pointed shape, so that the conventional annular end surface is not formed at the lower end of the guide tube, Even if the liquid droplet colliding with the inner peripheral surface of the guide cylinder flows down to the lower end of the guide cylinder at the time of releasing the air, it is shaken off by the force of the released air without staying at the lower end of the guide cylinder.

  At this time, even if it is the timing when the vehicle is stopped, the droplets due to the release of air performed before that time no longer remain at the lower end of the guide tube, so the droplets shaken off from the guide tube Is just a small amount of air that collides with the inner peripheral surface of the guide cylinder by a single release of air, and a large amount of liquid droplets collected up to that point in a single area, as in the past The situation where it gets dirty for a long time does not occur.

  In addition, it can be further stated that most of the water containing oil when air is released is mist-like and dissipated into the atmosphere without colliding with the inner peripheral surface of the guide cylinder. Thus, it is certain that the amount of liquid droplets that collide with the inner peripheral surface of the guide cylinder and flow down is extremely small.

  Further, in the present invention, it is preferable that a throttle part for gradually reducing the diameter of the guide cylinder downward is formed immediately above the lowermost part of the guide cylinder. The cross-sectional area of the flow path of the cylinder is narrowed down to increase the flow velocity at the time of air discharge, and the droplets can be effectively shaken off using the momentum of the discharge air.

  Further, in the present invention, the lowermost part of the guide cylinder is sharpened so that the lower end is cut at a horizontal plane and the thickness of the guide cylinder gradually decreases toward the lower end. The lowermost part may be sharply cut by obliquely cutting the lower end.

  In the present invention, the guide tube is divided into a guide tube main body and an insertion tube that can be fitted into the lower end of the guide tube main body, and the lower portion of the insertion tube defines the lowest part of the guide tube. And may have a sharp shape.

  According to the exhaust port structure of the air dryer of the present invention, the following various excellent effects can be obtained.

  (I) It is possible to avoid a situation in which a large amount of liquid droplets are dripped at a time when the air dryer is released in a stationary state and stains the ground over a wide area. Since it can be suppressed to a small amount for one discharge, the contamination due to the dropping of the droplets can be remarkably reduced as compared with the prior art.

  (II) If a throttle part that gradually reduces the diameter of the guide cylinder downward is formed immediately above the lowermost part of the guide cylinder, the effect is obtained by utilizing the momentum of the discharge air whose flow velocity is increased by the throttle part. Therefore, it is possible to further reduce the possibility of droplets remaining at the lower end of the guide cylinder, and a large number of droplets are dropped at a time when the air dryer releases air while the vehicle is stopped. Thus, it is possible to more reliably avoid a situation in which the ground is heavily stained over a wide area.

It is a fragmentary sectional view showing the first example of the present invention. It is sectional drawing which shows the 2nd Example of this invention. It is sectional drawing when the lower end of the lowest part of a guide pipe | tube is cut | disconnected with a big inclination angle. It is sectional drawing which shows the 3rd Example of this invention. It is sectional drawing which shows 4th Example of this invention. It is sectional drawing which shows 5th Example of this invention. It is a fragmentary sectional view which shows a prior art example. It is an arrow directional view of the VIII-VIII direction of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a first embodiment of the present invention. Like the conventional example of FIGS. 7 and 8, the exhaust port 4 at the bottom of the dryer body 1 is provided to suppress noise during air discharge. A longitudinal cross-sectional shape of the lowermost portion 10 of the guide cylinder 7, which is intended for an air dryer having a silencer 5 that has a silencer 5 and a guide cylinder 7 that is provided in the silencer 5 and prevents scattering of moisture including oil when air is released. Is characterized in that it is configured to have a sharp pointed downward shape, more specifically, the lowermost portion 10 of the guide tube 7 is cut at the lower end in a horizontal plane and directed toward the lower end. Accordingly, the guide tube 7 has a sharp shape so that the thickness of the guide tube 7 gradually decreases. The wall thickness at the lower end of the lowermost portion 10 of the guide cylinder 7 is preferably reduced to about 0.5 mm to 2.5 mm.

  Further, in the example shown here, a throttle part 11 for gradually reducing the diameter of the guide cylinder 7 downward is formed immediately above the lowermost portion 10 of the guide cylinder 7. As a result, the flow passage cross-sectional area of the guide cylinder 7 is narrowed down to increase the flow velocity at the time of air discharge. However, an appropriate flow passage cross-sectional area that does not give excessive exhaust resistance to air discharge is secured. ing. For example, in the case of a general air dryer, it is preferable to ensure a diameter of about 15 mm to 35 mm.

  Thus, in this way, the vertical cross-sectional shape of the lowermost portion 10 of the guide tube 7 becomes a sharp pointed shape, so that a conventional horizontal annular end surface is formed at the lower end of the guide tube 7. Even when the droplet 9 colliding with the inner peripheral surface of the guide tube 7 flows down to the lower end of the guide tube 7 when the air is discharged, the droplet 9 does not stay at the lower end of the guide tube 7 and is shaken off by the force of the discharged air. Will be.

  In particular, in the case of the present embodiment, a throttle part 11 for gradually reducing the diameter of the guide cylinder 7 downward is formed immediately above the lowermost portion 10 of the guide cylinder 7. The flow passage cross-sectional area of the cylinder 7 is narrowed to increase the flow velocity at the time of air discharge, and the droplet 9 that has collided with the inner peripheral surface of the guide cylinder 7 at the time of air discharge and flowed down is effective using the force of the discharge air Can be shaken off.

  At this time, even if a vehicle such as a truck stops at the loading / unloading destination of the load and performs a cargo handling operation or the like, the droplet 9 due to the release of air performed before that time is no longer the guide cylinder 7. The droplets 9 shaken off from the guide cylinder 7 are only a small amount that collides with the inner peripheral surface of the guide cylinder 7 due to the discharge of air once and flows down. In addition, a situation in which a large amount of liquid droplets 9 accumulated so far drops drastically and stains the carry-in / carry-out ground over a wide area does not occur.

  In addition, it can be further stated that most of the moisture including oil at the time of air release is mist-like and dissipated into the atmosphere without colliding with the inner peripheral surface of the guide cylinder 7, so It is certain that the amount of droplets 9 that flow down by colliding with the inner peripheral surface of the guide cylinder 7 due to the discharge is very small. In the drawing, for convenience of explanation, the droplets 9 that flow down the inner peripheral surface of the guide cylinder 7 are made larger. It is shown.

  Therefore, according to the above-described embodiment, it is possible to avoid a situation in which a large amount of liquid droplets 9 are dripped at a time when the air dryer is released while the vehicle is stopped, and the ground at the loading and unloading destination of the load is heavily stained. In addition, since the droplets 9 dripped from the guide cylinder 7 can be suppressed to a small amount corresponding to one air discharge, the contamination due to the dripping of the droplets 9 can be significantly reduced as compared with the conventional case.

  In particular, in the case of the present embodiment, the droplet 9 can be effectively shaken off using the momentum of the discharge air whose flow velocity is increased by the throttle portion 11, so that the droplet is placed at the lower end of the guide cylinder 7. 9 can be further reduced, and it is possible to more reliably avoid a situation in which a large amount of liquid droplets 9 are dripped at a time when the air dryer releases air while the vehicle is stopped, causing the ground to be heavily stained over a wide area. be able to.

  FIG. 2 shows a second embodiment of the present invention. In this second embodiment, the lowermost portion 10 of the guide cylinder 7 is cut at a lower end obliquely to have a sharp shape. The inclination angle θ (inclination angle with respect to the horizontal plane) is preferably about 20 ° to 60 °. If the inclination angle θ is increased beyond this range, the lower end of the guide cylinder 7 is lowered as illustrated in FIG. It will extend for a long time and the mountability on the vehicle will be worse.

  However, when the lower end of the guide cylinder 7 is cut obliquely, in addition to cutting with a single cut surface as shown in FIG. 2, a plurality of different inclination angles θ are shown as shown in FIG. In this way, the inclination angle θ of the final lowermost portion 10 of the guide cylinder 7 can be obtained without deteriorating the mountability to the vehicle. Can be as close to 90 ° as possible.

  FIG. 5 shows a fourth embodiment of the present invention. In this fourth embodiment, the guide tube 7 is connected to the guide tube main body 12 and the insertion tube 13 that can be fitted in the lower end of the guide tube main body 12. The lower portion of the insertion tube 13 forms a lowermost portion 10 of the guide tube 7 and is sharpened. Here, the lower portion of the insertion tube 13 is A sharp shape is given by cutting diagonally.

  Furthermore, as shown in FIG. 6 as a fifth embodiment, the narrowed portion 11 may be formed directly above the sharpened lower portion of the insertion tube 13 of FIG. If the guide cylinder 7 is divided into the guide cylinder main body 12 and the insertion tube 13, the existing equipment can be remodeled extremely easily.

  In addition, the exhaust port structure of the air dryer of the present invention is not limited to the above illustrated example, and the throttle portion may be used in combination as necessary, and in the range not departing from the gist of the present invention. Of course, various changes can be made.

DESCRIPTION OF SYMBOLS 1 Dryer main body 4 Exhaust port 5 Silencer 7 Guide cylinder 9 Droplet 10 Lowermost part 11 Restriction part 12 Guide cylinder main body 13 Insertion pipe

Claims (5)

  Exhaust of an air dryer having a silencer that is provided in an exhaust port at the lower part of the dryer body and suppresses noise during air discharge, and a guide cylinder that is provided in the silencer and prevents scattering of moisture including oil when air is discharged. In the port structure, the exhaust port structure of the air dryer is characterized in that the vertical cross-sectional shape of the lowermost portion of the guide cylinder is configured to have a sharpened pointed shape downward.   2. An exhaust port structure for an air dryer according to claim 1, wherein a throttle part for gradually reducing the diameter of the guide cylinder downward is formed immediately above the lowermost part of the guide cylinder.   3. The lowermost portion of the guide tube is cut at a lower end with a horizontal plane, and has a sharp shape so that the thickness of the guide tube gradually decreases toward the lower end. Exhaust port structure for air dryer as described in 1.   The exhaust port structure of an air dryer according to claim 1 or 2, wherein the lowermost portion of the guide cylinder has a sharpened shape by obliquely cutting the lower end.   The guide tube is divided into a guide tube main body and an insertion tube that can be fitted into the lower end of the guide tube main body, and the lower portion of the insertion tube forms the lowest part of the guide tube and has a sharp shape. The exhaust port structure for an air dryer according to claim 1, wherein the exhaust port structure is an air dryer.

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