JP2007154705A - Pre-air cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pre-air cleaner capable of sending air less of dust to a filter in a filter case by giving a swirling flow to the air outside the filter case to remove dust by centrifugal force and by further removing remaining dust from the air from which part of the dust is removed. <P>SOLUTION: An inlet chamber 20 is provided in a lower part of a front surface of the filter case 5 for giving the swirling flow to introduced air. The air containing dust that is the reminder of the dust removed by the swirling flow is sent out from a lower end of a chimney-shaped air supply path 25 in an upper end direction of the filter 5, is passed through each filter 6 layer in the case downward to filter the remaining dust. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pre-air cleaner for supplying pre-purified air to a carburetor of a prime mover in various working machines.

  Conventionally, among various work machines, for example, in a vibration compaction machine such as a rammer, which is often used under extremely dirty air because a large amount of dust rises when the compaction plate hits the road surface. It is important to always clean the carburetor air cleaner and make it function properly.

  Conventionally, as a protective measure for such a vaporizer, before the air is directly filtered by an air cleaner, large dust particles are captured in advance by another pre-air cleaner, and the purified air filtered by the pre-air cleaner is collected. Supplying to the air cleaner of a vaporizer is performed.

  Therefore, conventionally, as this type of pre-air cleaner, for example, as shown in FIG. 5, an air inlet A that communicates with the atmosphere is provided at the upper end of a compacting machine such as a rammer, and the air filtered at the upper part. A case having an air outlet B for feeding the air to the air cleaner of the vaporizer is disposed, and the coarse filter C is disposed in the lower layer and the fine filter D is disposed in the upper layer in the case. Is introduced from the lower air inlet A, and dust is captured in the process of passing through the filters C and D in both upper and lower layers, and then the filtered air is supplied from the upper air outlet B to the vaporizer. Such pre-air cleaners are known.

JP 2002-195112 A

  However, since this type of pre-air cleaner is often used under severe air conditions, a structure in which an air introduction port communicating with the atmosphere is provided at the bottom of the case as in Patent Document 1. In this case, air containing a large amount of dust constantly adheres directly from the air inlet to the lower surface of the lower coarse filter in the case and closes the lower surface of the filter in a short period of time. It has the problem of requiring cleaning and replacement.

  In addition, since pre-air cleaners are used under severely dirty air conditions that contain a large amount of dust, not only the air cleaner part but also the entire airframe is contaminated with dust. It is necessary to spray the water with a hose to clean the aircraft.

  In this case, in the pre-air cleaner as shown in Patent Document 1, since the air inlet A is opened at the lower part of the case so as to communicate with the atmosphere, the injected water for removing dirt is the air inlet. When the filter is immersed directly into the case from A and the filter is submerged, and the operator leaves it without noticing the submerged state in the case, the pre-air cleaner becomes in a state containing water. It has a problem that it cannot function.

  Furthermore, in a pre-air cleaner used for a construction work machine such as a rammer, for example, the work machine has a structure in which one pedestal is supported by a single pressure plate, so the machine falls over when the machine stops. In some cases, the filter case made of plastic is easily damaged by impact when it falls, and the pre-air cleaner must be replaced with the case.

  In view of the problems of the conventional pre-air cleaner as described above, the present invention eliminates the dust-containing air directly into the filter case, and removes most of the dust by the centrifugal force accompanying the swirling flow at the front of the case. The air that is separated from the air and that contains the remaining dust is caused to flow so as to be guided upward from below through the air supply path provided on the outer surface of the case, and is guided to the upper end of the filter case. The object is to provide a pre-air cleaner that allows the remaining dust to be accurately filtered by flowing downward.

  As a specific means for configuring the pre-air cleaner, the present invention includes a bathtub-shaped case having a detachable cover plate at the upper end of the filter case and provided with a delivery port at one corner of the lower end. Below the wall is a suction chamber that creates a swirling flow with the guide vanes in the inflowing air, an air supply path for sending the swirling flow from the inlet of the suction chamber toward the opening end of the upper end of the case, and sliding down to the lower portion of the suction chamber And a discharge hole for discharging the dust outside the suction chamber.Air removed from the suction chamber is sent from the suction chamber below the case through the air supply path toward the upper end of the upper case opening, It distribute | circulates from the upper direction to the downward | lower direction, It sends out from a sending exit.

  It is preferable to provide a conical inclined surface that gives an auxiliary swirling action to the swirling flow generated in the suction chamber, on the outer periphery of the inlet port at the back of the suction chamber provided below the front surface of the filter case.

  A base made of an annular partition is provided on the bottom plate in the case, an element filter is disposed on the base, and a urethane foam filter is disposed on the upper surface of the element filter. It is preferable to have a structure in which a delivery port leading to the outside of the case is provided.

  A structure in which a soundproof cover that covers the filter case is disposed outside the upper end of the filter case including the inverted dish-shaped lid plate is preferable.

  In the pre-air cleaner of the present invention, when air containing a large amount of dust is sucked into the suction chamber on the side of the case, the air is swirled by the guide vanes on the front surface of the suction chamber, so a large amount of dust is applied to the inner wall of the suction chamber by centrifugal force. Since air that has been removed by collision and contains the remaining dust can be filtered by a filter in the case, an appropriate dust removal effect can be expected.

  In this case, if a conical inclined surface is provided inside the suction chamber, air swirled into the suction chamber and turned into a swirl flow is guided by the slant surface to change the direction of the flow. As a result, the dust removal action can be improved.

  Further, in this pre-air cleaner, air from which a part of dust is removed in the suction chamber on the front wall of the case is directed toward the opening at the upper end of the case through a chimney-shaped air supply path provided between the suction chamber and the case side wall. Since the structure was introduced, even if water sprayed from the hose was sprayed into the suction chamber when the aircraft was cleaned, the guide vanes blocked the intrusion of water, and suppose that a part of the water entered the suction chamber. However, since it is possible to reliably prevent the water from moving to the upper end of the case through the air supply path, it is possible to reliably eliminate the inconvenience caused by the water flowing into the case where the filter is arranged.

  The inverted dish-shaped cover plate attached to the upper end opening of the filter case is detachably attached via a peripheral edge of the upper end opening of the case and a bolt, and on the outer side of the case, there is an upper surface of the filter case. A structure in which a soundproof cover is provided so as to cover the side surface having the suction chamber is preferable, and by providing this soundproof cover, it is possible to prevent the cleaning water that removes dirt from being sprayed to the pre-air cleaner, Further, when the airframe falls down, the soundproof cover is damaged, and the cover plate at the upper end of the case of the air cleaner can be prevented from being damaged, and the damage can be reduced.

  Next, the configuration of the pre-air cleaner according to the present invention will be described with reference to the illustrated embodiment. The pre-air cleaner 1 is provided on an upper portion of a power transmission mechanism or the like that converts a rotational motion of a prime mover (not shown) into a vertical motion. After the dust-containing air is sucked from the air suction chamber 20 provided in the front surface of the filter case 5 constituting the cleaner 1 and filtered by the filters 6a, 6b, 6c provided in the case 5, It is configured to be sent to the carburetor air cleaner of the prime mover through the delivery port 19.

  The filter case 5 includes a bottom surface 7, a front wall 8, left and right side walls 9 a and 9 b, a rear wall 10, and an opening at an upper end, which are detachably attached to the upper surface of a power transmission mechanism or the like via bolts. 11, and an inverted dish-shaped lid plate 12 having a shape in which the dish is turned upside down is detachably attached to the opening 11 at the upper end by a bolt 13 or the like. The cover plate 12 accommodates air in the upper end opening 11 when air containing dust is sent upward from below the case 5 through the air supply path 25 on the front surface of the case 5 which will be described in detail later. The shape is such that it can be fed to the entire surface of the filter 6 a through the space between the surface of the filter 6 a and the inner surface of the cover plate 12.

  On the bottom surface 7 inside the filter case 5, a pedestal 14 for supporting the element filter 6 c, which is a horizontally long annular partition wall having a height of about ３ of the depth of the case 5, A fixing column 16 for fixing the pedestal 14 provided with a female screw 15 on the inside is provided at the center, and a delivery port 19 is provided from the inner bottom of the pedestal 14 for the element filter 6c to the outside of the case 5. Yes.

  The element filter 6c is placed on the pedestal 14, and the upper surface plate 18 of the filter 6c is supported by the upper end of the fixed column 16, and a bolt 17 is inserted into the fixed column 16 and fixed to the female screw 15. Thus, the element filter 6 c is arranged in the case 5.

  A fine urethane foam filter 6b and a coarse urethane foam filter 6a are arranged on the upper surface of the element filter 6c, and the outside of the case 5 is passed through the rear wall 10 from the inner bottom of the pedestal 14 for the element filter 6c. A delivery port 19 is provided at a portion that leads to.

  A horizontally long suction chamber 20 for introducing external air into the case 5 is provided at a lower portion of the front wall 8 of the filter case 5. Guide vanes 21a that generate a swirling flow in the direction of the needle and guide vanes 21b that generate a swirling flow in the direction of the counterclockwise hand are provided at symmetrical positions.

  When air is sucked into the suction chamber 20 by driving the prime mover, swirling flows in different directions are generated on the back surfaces of the pair of left and right guide vanes 21a and 21b, and the swirling flows collide with each other so that part of the dust Is removed to the lower part of the suction chamber. Further, on the inner surface of the suction chamber 20, there are provided a cylindrical lateral introduction port 22 along a coaxial line with the center of each swirl flow, and a conical inclined surface 23 on the outer periphery of the introduction port 22. Thus, the air near the center of the swirling flow passes through the lateral introduction port 22 and is sent in the direction of the air supply path 25 on the back surface, and the air near the outer periphery of the introduction port 22 runs along the conical inclined surface 23. The turning action is subsidized by flowing. As a result, the separation of dust by centrifugal force is promoted, and the separated dust slides down in the suction chamber 20 and is discharged so as to be blown out of the case 5 from the discharge hole 24 provided in the bottom surface. .

  An air supply path 25 for sending dust-containing air toward the upper end of the filter case 5 is provided in the suction chamber 20 at the inner side of the lateral introduction port 22. The air supply path 25 is provided with an outer wall 26 above the suction chamber 20 provided in front of the front wall 8 in the filter case 5 with a gap between the case 5 and the front wall 8. Is provided in such a manner that the lower end thereof communicates with the inlet 22.

  The air from which most of the dust has been removed by the centrifugal force of the swirling flow in the suction chamber 20 is pushed up from the lower end of the narrow air supply path 25 at the back of the inlet 22 to the open end of the upper end of the case. In the process of being pushed upward from below, part of the dust comes into contact with the inner wall surface of the supply path 25 and falls below the air supply path 25 before reaching the upper end of the air supply path 25. The air with reduced dust can be supplied onto the filter 6a in the 5.

  As shown in FIG. 1, a plastic soundproof cover 27 is provided above the front surface of the filter case 5 so as to cover the upper surface, front surface, and both surfaces of the filter case 5.

  When negative pressure is generated at the delivery port 19 provided at the bottom of the filter case 5 through a vaporizer (not shown) by driving the prime mover, air containing dust flows into the suction chamber 20 provided at the front surface of the filter case 5. , A swirling flow is generated due to the flow along the guide vane 21a and the guide vane 21b, dust contained in the air collides with the inner wall of the suction chamber 20 by centrifugal force and is removed, and the air containing the remaining dust is introduced into the inlet. The air supply path 25 in the back portion is raised through 22, filtered by the filters 6 c, 6 b, 6 a at the upper end in the case 5, and sent from the outlet 19 toward the filter of the vaporizer.

  In this pre-air cleaner, the inlet of the suction chamber is blocked by the guide vanes, so that water for cleaning the airframe can be prevented from directly entering the filter case, and a part of the swirl flow by the guide vanes can be prevented. The structure is such that the air from which dust has been removed is introduced from the lower part of the suction chamber toward the opening of the upper end of the case, so the dust removal action is accurately performed while passing through the lower filter from the upper filter, and it is properly purified. The air thus sent can be sent to the carburetor, and can be particularly suitable as a pre-air cleaner for a work machine.

Sectional drawing which shows the structure of the pre air cleaner which concerns on this invention. Sectional drawing which shows the structure of the other side of the pre air cleaner of FIG. The perspective view which looked at the shape of the pre air cleaner concerning the present invention from the front upper part. The perspective view which removed the cover plate and showed the internal structure. Sectional drawing which shows the structure of the conventional pre air cleaner.

Explanation of symbols

1: Pre-air cleaner,
5: Filter case,
6a, 6b, 6c: filter,
7: Case bottom,
8: Case front wall,
9a, 9b: both left and right walls,
10: Case rear wall,
11: Case upper end opening,
12: Cover plate
13, 17: Bolt,
14: Pedestal
15: female screw,
16: fixed column,
18: top plate,
19: Outlet,
20: inhalation chamber,
21a, 21b: guide vanes,
22: Introduction port
23: conical inclined surface,
24: discharge hole,
25: Air supply path,
26: outer wall,
27: Soundproof cover

Claims (4)

A pre-air cleaner for supplying pre-purified air to a carburetor of a prime mover, comprising a detachable lid plate at the upper end of the filter case, and a bathtub-shaped case provided with a delivery port at one corner of the lower end,
Below the front wall of the case, a suction chamber for generating a swirling flow by the guide vanes in the inflowing air, an air supply path for sending the swirling flow from the inlet in the suction chamber toward the opening end of the case, and a suction chamber It has a discharge hole for discharging dust that has slid down to the outside of the suction chamber, and the air removed from the suction chamber is sent from the suction chamber below the case through the air supply path toward the upper end of the upper case opening, and the filter in the case A pre-air cleaner characterized in that the inside of the layer is distributed from the upper side to the lower side and is sent out from the outlet.   2. The pre-air cleaner according to claim 1, further comprising a conical inclined surface that provides an auxiliary swirling action to a swirling flow generated in the suction chamber, on the outer periphery of the introduction port at the inner back of the suction chamber.   A base made of an annular partition is provided on the bottom plate in the case, an element filter is placed on the base, a urethane foam filter is placed on the upper end of the element filter, and the case starts from the bottom of the base of the element filter. The pre-air cleaner according to claim 1, wherein a delivery port leading to the outside is provided.   The pre-air cleaner according to claim 1, wherein a soundproof cover is arranged on the outer periphery including the inverted dish-shaped lid at the upper end of the filter case so as to cover the filter case.

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