JP2011241695A - Engine-driven working machine having vent of louver structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent ingress of rain inside a casing of an engine-driven working machine, and to reduce leakage of noise such as engine noise outside the casing.SOLUTION: A louver structure of a vent 3 includes inner and outer louver layers 30, 40 which are arranged symmetric to and opposite to each other. A V-shaped vent passage is formed between the inner and the outer louvers, and a space is formed between a lower end of the outer louver and a lower end of the inner louver which are brought close to each other. The inside of the louver structure is invisible from the outside of the vent 3.

Description

  The present invention relates to an engine-driven work machine having a louver structure and a vent for intake, exhaust, and ventilation.

  Since the engine-driven work machine is installed and used outdoors, in addition to the engine as a drive source, work machines such as a generator, a compressor, and a welder are housed in a casing and formed as an all-weather type. Such engine-driven work equipment has casings that contain electrical equipment for operation and control, so that rainwater can enter the vents for intake, exhaust, and ventilation when it rains. A louver structure is used to prevent intrusion.

  As such a louver structure for preventing the intrusion of rainwater in a conventional engine-driven work machine, for example, as shown in FIG. 5, a vent 110 provided on the side wall surface of the casing 101 of the engine-driven work machine 100. Patent Document 1 describes a louver structure that is formed so as to be inclined downward from the inside to the outside of the housing 101. The vent 110 of the engine-driven work machine 100 has a louver structure that is inclined downward toward the outside, so that even if rainwater blows onto the vent 110, the rain is blown to the outside of the housing 101 by the inclined surface that is inclined downward. The rainwater is prevented from entering the housing 101 of the engine-driven work machine 100.

  Further, for example, as shown in FIG. 6, as a structure for preventing rainwater from entering a control panel used for control of an electric device or the like installed outdoors, the vent hole portion 200 is connected from the inner side of the housing 201 to the outer side. A louver 210 that forms a horizontally long opening A with a plurality of plates that are inclined downward toward the front, an inner louver 220 that is inclined downward toward the inside in contrast to the louver 210, and an inner louver 220. Consists of a filter base 230 having a ventilation opening B formed in the center and a drain hole C formed in the lower part, and a filter 240 provided by closing the ventilation opening B of the filter base 230. Even if the rainwater jets lie upside down or blown upward due to building winds, etc., they pass through the reverse U-shaped air passage and become downward water droplets that are discharged downward from the drain hole C. The structure so that is described in Patent Document 2.

Japanese Patent Laying-Open No. 2007-224892 (FIG. 7) JP 2000-295721 A (FIG. 1)

  In the louver structure described in Patent Document 1, in the case of wind and rain when the wind is not strong enough to cause rain to fall to the ground, rain water that enters the casing 101 of the engine-driven work machine 100 is prevented. Although it is effective to do so, there is a problem that it is not enough to prevent rainwater entering the inside of the housing 101 in the case of sideways or windstorms such as heavy rain due to heavy rain, storms, or building winds. Get up. Moreover, in the case of the louver structure described in Patent Document 1, there has also been a problem of noise that engine sound or the like leaks to the outside through a gap between the louvers in the vent holes.

  Further, in the rainwater intrusion prevention structure described in Patent Document 2, water drops downward by passing through the inverted U-shaped air passage, but rainwater entering from the upper louver 210 drops from the lower end of the inner louver 220. Or when water droplets adhering to the outside of the inner louver 220 directly underneath are scattered and sucked into the housing, or the water droplets falling from the inner louver 220 are discharged downward into the drain hole C. However, there is a problem that dust is easily collected and cleaning is necessary to remove it, but it is difficult because the shape is bag-like and complicated.

  Accordingly, an object of the present invention is to solve the above-described problems, and to prevent the intrusion of rainwater into the casing of the engine-driven work machine and to reduce noise leakage such as engine noise to the outside of the casing. As a double layer structure, rainwater is effectively separated from wind and rain in the ventilation path, and the rainwater is devised so that the separated rainwater can be collected and concentrated so that the inside cannot be seen through from the outside of the housing. Engine drive work with a new louvered vent that prevents the intrusion of water more effectively, collects rainwater well, prevents dust and dirt from accumulating, and prevents engine noise from leaking outside It is an object to provide a machine.

Means taken in order to solve the above-mentioned problems are as follows.
An engine-driven work machine having a louver-structured vent according to claim 1 is an engine-driven work machine having a louver-structured vent on the side of a housing that houses the engine, work machine, and the like. The vent includes an outer frame composed of an upper plate, a lower plate, and side plates on both sides, and the louver structure is an external louver composed of a plurality of louvers provided between the side plates of the outer frame and spaced apart from each other. The inner louver layer and the inner louver layer are symmetrically disposed opposite to each other, and the louvers at the respective steps of the louver layer disposed opposite to each other are inclined downward and facing each other. The lower end of the external louver and the lower end of the internal louver are close to each other, and a V-shaped air passage communicating from the outside to the inside of the housing is formed between the external louver and the internal louver in the adjacent upper and lower stages. In addition, a gap is formed between the lower end of the external louver and the lower end of the inner louver that are close to each other, and at least one of the lower end of the outer louver and the lower end of the inner louver that forms the gap is the lower outer louver. Arranged at a position below the upper end, the upper plate of the outer frame has an upper end of the uppermost outer louver and a blocking piece bent to an intermediate position between both louvers located below the upper end of the inner louver. The lower plate of the outer frame has a configuration in which a leading end bent at the inner end has a lower outer louver lower end or an inner edge of the lower plate located above the lower end of the inner louver.
(Function)
With this configuration, the louver structure of the vent is symmetrically arranged as two opposing louver layers inside and outside, and the louvers at each stage of the inner and outer louver layers are inclined downward so as to face each other and come close to each other. In addition to having a structure in which the inside of the housing can not be seen through from the outside by the upper plate blocking piece and the lower plate inner edge of the lower plate, both above and below the inner and outer louver layers. In the V-shaped air passages formed in each louver layer, the rainwater component contained in the wind and rain becomes an air flow along the lower side of the air passage that easily adheres to the louver surface due to gravity or centrifugal force. After being introduced, the air flow that descends and then reverses and rises can allow water droplets to sufficiently collide or come into contact with the surface of each louver, effectively separating rainwater from wind and rain By centrally collecting rainwater separated at the bottom of the air passage, it is possible to more effectively prevent rainwater from entering, the drainage of the collected rainwater is better, and dust and dirt are not collected in the vents. Thus, it is possible to provide a new louver structure that reduces engine noise and the like in the casing so that it does not leak directly to the outside.

An engine-driven work machine having a louver-structured vent according to claim 2 is characterized in that the V-shaped vent passage has at least a vent passage cross-sectional area in an opening portion between external louvers in the vent passage. It is formed so that it may be maintained.
(Function)
With this configuration, it is sufficient to ensure that the cross-sectional area of the air passage in the opening between the external louvers that take in the outside air is substantially uniform even in the air passage so that the resistance of the air flow does not increase. The amount of ventilation can be ensured, and at least the cross-sectional area of the ventilation flow can be reduced so that the flow velocity does not increase, so that the contact time with the louver surface that acts to separate rainwater can be sufficient.

In the engine-driven work machine having the louver-structured vent according to claim 3, in claim 1 or 2, the external louver is formed in a cross-sectional shape in which a bent top is positioned on the outside, and The internal louver was formed in a reverse cross-sectional shape with a bent top located on the inner side.
(Function)
With this configuration, in the ventilation channel of the bent top portion formed in a cross-sectional shape and a reverse cross-sectional shape, the wind pressure decreases due to an increase in the cross-sectional area, and the flow velocity is partially slowed down, which is included in the wind and rain. As the water droplet component is sufficiently contacted on the louver surface, the attachment of rainwater droplets advances and the separation effect is improved, and the vortex along the louver surface is formed at the bent top of the cross-section and the cross-section. As a result, the water droplet component can be attached by the centrifugal force of the eddy current effect, so that the rainwater separation effect is further improved.

In the engine-driven work machine having the louver structure vent according to claim 4, in any one of claims 1 to 3, the lower end of one of the lower end of the external louver and the lower end of the internal louver forming the gap is The position is shifted downward from the other lower end.
(Function)
With this configuration, rainwater can be concentrated and collected at the central part of the vent, which is the middle part of both louver layers, at the lower end of each louver of the outer louver layer and the inner louver layer. In order not to dissipate, drainage can be induced by collecting rainwater at either lower end. In this case, if rainwater is collected on the internal louver side with the lower end of the internal louver side shifted downward, it is easy to create a drainage flow toward the outside of the housing at the lowest level, and natural drainage to the outside of the housing is facilitated. This is desirable. In short, it is only necessary to form the gap between the lower ends of both louvers so that rainwater can be drained naturally.

In the engine driven work machine having the louver structure vent of claim 5, the upper end portion of the internal louver is bent and formed as a baffle plate protruding into the vent passage. The configuration.
(Function)
With this configuration, the water droplet component contained in the outside air supplied to the inside of the housing through the V-shaped air passage from the opening between the outer louvers is not separated from the outside provided in the opening of the inner louver. Since the baffle plate bent toward the side is provided so as to protrude into the air passage, rainwater droplet components are prevented from entering the housing by the baffle plate, and rainwater is generated by the eddy current generated by the baffle plate. A further separation effect can be achieved.

An engine-driven work machine having a louver-structured vent according to claim 6 is characterized in that in claim 1 to claim 5, the outer louver layer is formed to be detachable from the outer frame of the vent. It was.
(Function)
With this configuration, the external louver layer can be attached to and detached from the vent, so the louver structure is an open structure. Maintenance can be performed satisfactorily, and when the external louver layer is damaged, it is only necessary to replace the external louver layer, so that parts can be easily replaced.

  According to the invention of the present application, in a vent having a louver structure that is a double louver layer that is symmetrically arranged opposite to each other, overcoming problems in the conventional louver structure, Effectively separates rainwater and collects the separated rainwater in a concentrated manner, facilitating natural drainage to the outside of the enclosure, and the drainage of the collected rainwater is good, so that dust and dirt do not accumulate, The structure that prevents the inside of the housing from being seen through prevents the intrusion of rainwater more effectively and reduces the engine noise generated by the engine-driven work machine from leaking outside. There is an effect that can be done.

It is the schematic of the engine drive working machine provided with the vent of the louver structure which concerns on 1st Embodiment. It is a perspective sectional explanatory view of a vent which has a louver structure concerning a 1st embodiment. It is a section explanatory view of the louver structure concerning a 1st embodiment. (A) is sectional explanatory drawing of the whole louver structure which concerns on 1st Embodiment. (B) is a cross-sectional enlarged explanatory view of the louver structure details of the round frame portion of FIG. It is a section explanatory view of the louver structure concerning a 2nd embodiment. (A) is a cross-sectional explanatory view showing a louver structure formed separately according to the second embodiment. (B) is sectional explanatory drawing which shows the state which assembled | attached the separately formed louver structure of Fig. (A). It is explanatory drawing of the vent provided with the conventional louver structure. It is explanatory drawing of the vent provided with the other conventional louver structure.

(First embodiment)
Next, a first embodiment of an engine-driven working machine having a louvered vent according to the present invention will be described in detail with reference to the drawings.

(Outline of vent with louver structure)
As shown in FIG. 1, the vent 3 provided with the louver structure L of the first embodiment is used for an engine-driven work machine 1 in which a work machine W such as a generator, a compressor, or a welder is housed in a housing 2. Is done.
The vent 3 is an opening provided on the side surface of the housing 2 housing the engine-driven work machine 1 and used for intake / exhaust / ventilation. The air vent 3 is an entrance / exit of outside air that is forcibly sucked in, exhausted, or alternately ventilated by a fan of the engine E accommodated in the housing 2.
In the following description of the present embodiment, a case where the louver structure L is applied to the intake vent 3 will be described, but the purpose of the louver structure is not limited.

(Louvre structure)
As shown in FIG. 2, the louver structure is configured so that the outer appearance of a vent 3 provided on the side surface of the housing 2 is integrally mounted in an outer frame 10 having a horizontally long rectangular shape.
The louver structure L of the present embodiment is mainly composed of an outer louver layer 30 and an inner louver layer 40 disposed at an interval on the inner side. As shown in the drawing, the outer louver layer 30 and the inner louver layer 40 are symmetrically arranged in a double louver layer, and the louver structure L is configured. A cover 20 is provided integrally with the outer frame 10 above the inner louver layer 40.
Flat flange frames 11 are formed on the four peripheral edges of the outer frame 10 formed of a horizontally long rectangular frame. The flat flange frame 11 is attached to the vent 3 by using a bolt or the like (not shown) when the outer frame 10 having the louver structure L of the present embodiment is attached to the vent 3 of the housing 2. Is provided.

The outer frame 10 includes an upper plate 12 and a lower plate 14 that are disposed so as to face each other in the vertical direction, and is mainly horizontally long from side plates 13 and 13 that are disposed so as to face each other at both ends of the upper plate 12 and the lower plate 14. It is configured as a rectangular frame.
The upper plate 12 is formed with a blocking piece 12a (see FIGS. 3A and 3B) that is bent in an inclined shape from the center of the depth width toward the lower outside. The upper plate 12 may be formed by extending the depth width to the full width of the side plate 13. In this case, the lower end of the blocking piece 12a bent in an inclined shape is formed so as to extend to a position along an extension line X (see FIG. 3B) described later in the center of the outer frame 10. To do.
On the other hand, when the outer frame 10 is attached to the vent 3, the lower plate 14 is inclined so as to have a sloping surface that is lowered toward the outside through the entire length so that rainwater can be naturally drained to the outside of the housing 2. Is formed.

A plurality of louvers are arranged between the side plates 13 and 13 so as to form one layer in a state where they are stacked at intervals in a step shape, and the step shape attached to the outside side in the depth width direction. The outer louver layer 30 is formed by the louvers, and the inner louver layer 40 is formed by the stepped louvers attached to the inner side.
As shown in FIGS. 3A and 3B, the cover 20 is welded with one end so as to cover the upper portion of the inner louver layer 40 in the louver structure L, and is joined to the upper plate 12 by being overlapped with the upper plate 12. 10. An inner edge 20 a that is bent downward is formed at the inner side end of the cover 20. The inner edge 20 a is formed flush with the inner end portion 13 b of the side plate 13. The cover 20 can be omitted when the upper plate 12 of the outer frame 10 is extended as described above so as to cover the upper portion of the inner louver layer 40 with the upper plate 12.

FIG. 3A shows the entire cross section of the louver structure L. The outer louver layer 30 and the inner louver layer 40 are basically formed in a cross-sectional shape and a reverse cross-sectional shape. The formed outer louver 31 and the inner louver 41 are configured so as to face each other symmetrically.
More specifically, the external louver layer 30 is configured by arranging external louvers 31, 31,... In a plurality of stages at intervals in the vertical direction. In the present embodiment, the external louver layer 30 is composed of external louvers 31, 31,.
The inner louver layer 40 is disposed with a space between the outer louver layer 30 and the depth width of the side plate 13. Like the outer louver layer 30, the inner louvers 41, 41,. Are arranged in a plurality of stages and are composed of internal louvers 41, 41,... Consisting of seven stages (seven sheets).
In the present embodiment, the louver structure L is configured by adding the auxiliary louver 32 to the lowermost stage of the external louver layer 30. Between the side plates 13, 13, the end portions of the louvers and auxiliary louvers 32 of each layer are attached by welding, screws or the like.

FIG. 3B shows details of the louver structure L. In the description of the present embodiment, the left side of the figure is referred to as the external side, and the right side is referred to as the internal side.
Explaining the cross-sectional form of the external louver 31, as shown in the figure, the external louver 31 has a tip whose upper part is inclined upward from the surface on the outer side toward the inner side, and its lower part is directed toward the inner side. It has a lower end that is inclined downward, and has a cross-sectional shape as a whole, and is formed so that the apex of the cross-sectional shape is located at the outer end 13 a of the side plate 13.
The point A in the figure indicates the position of the tip of the external louver 31, and as shown in the drawing, the tip of the external louver 31 in the cross-sectional shape of the cross-sectional shape is located slightly inward from the external surface. Is bent. From the point A to the point B (bending point) in the figure, an upper end inclined portion 31a serving as an intake opening for intake is bent at a predetermined inclination angle from the front end to the outside direction with a predetermined inclination angle. ing. Next, from the point B to the point C (bending point) continuously, the outer side is bent from the upper end inclined portion 31a at the point B and forms a vertical plane so as to be exposed along the side surface of the housing 2. A surface portion 31b is formed. Two points continuously from point C (bending point) on the lower side of the outer surface portion 31b to a point E indicating the position of the lower end through an intermediate point D (bending point) that is continuously bent inward. An inclined portion that is inclined downward first is formed as a lower portion of the external louver 31.

In the lower part of the outer louver 31, the intermediate inclined part 31c between C and D shown in FIG. 2 is slightly bent from the point C with respect to the outer surface part 31b than the upper end inclined part 31a. It has the inclined surface where the bending angle with respect to becomes loose.
Continuing from the intermediate slope 31c between C and D, a lower end slope 31d that bends loosely from the point D and has an angle with respect to the lower side than the point C is steeper than the intermediate slope 31c is D. -E is formed. The lower end inclined part 31d is formed so that the separated rainwater is collected on the inclined surface of the lower end inclined part 31d and dropped downward.

  On the other hand, the internal louver 41 as a whole has a cross-section of a reverse letter-shaped configuration that is substantially symmetrically opposed to the cross-section of the outer louver 31, and the apex of the inverted cross-section is the side plate. 13 is formed so as to be located at the inner end 13b. The inner louver 41 is formed with an upper end portion 41a whose upper end is bent at an inclination angle with the tip rising upward from the inner surface to the outer side, and the lower portion is inclined downward toward the outer side. As a whole, it is formed so as to have a cross-section in the shape of an inverted letter.

  As shown in FIG. 3B, in the present embodiment, an example is shown in which the upper end portion 41a of the inner louver 41 is bent horizontally so that the inclination angle is a right angle with respect to the inner surface. The present invention is not limited to this horizontal example, and the upper end portion 41a may be bent at a gentle slope with an angle smaller than a right angle, but the upper end portion 41a is horizontal as shown in the figure. In the case of this example bent into a shape, the horizontal upper end portion 41a is formed as a baffle plate from which outside air vented to the inside of the housing 2 projects into the vent passage in a horizontal manner. Since it acts as a weir provided for the ventilation path and disturbs the flow of ventilation, rainwater droplet components are prevented from entering the inside of the housing 2 at the horizontal upper end 41a. This is preferable because of its high effect.

  Next, the cross-sectional form of the inner louver 41 will be described. In FIG. 3B, the point a in the figure indicates the position of the tip of the inner louver 41. As shown in the drawing, the tip of the inner louver 41 is The inner side edge 13b of the side plate 13 is located slightly inward. From the point a to the point b (bending point) in the figure, an upper end portion 41a is formed which serves as an intake outlet opening portion whose front end is bent horizontally toward the outside. Next, from the continuous b point to the c point (bending point), the inner surface portion 41 b that is bent vertically from the upper end portion 41 a at the point b to form a vertical plane along the inner side surface of the housing 2. Is formed. Subsequently, the inner surface portion 41b is inclined from the lower point c (bending point) to the outside direction and passes through the middle d point (bending point) to the lower end e point similarly to the outer louver 31. A lower portion of the inner louver 41 is formed which is bent continuously in two stages and inclined downward.

  In the lower part of the internal louver 41, an inclined portion inclined in two stages is formed between c and e in the figure. The upper middle inclined portion 41c between c and d is an inclined surface with a bending angle from the point c to the point d lowered with respect to the inner surface along the inner surface of the housing 2, and between d and e. The lower lower end inclined portion 41d of the lower stage has an inclined surface whose bending angle is slightly larger than that of the upper stage, and therefore the bending angle with respect to the lower side is steeper than that of the intermediate inclined portion 41c. The lower end inclined portion 41d is formed so that the separated rainwater is collected on the inclined surface of the lower end inclined portion 41d and dropped downward.

As described above, in the first embodiment of the present invention, the upper part of the external louver 31 is point A to point C from the upper end inclined part 31a to the outer surface part 31b as shown in FIG. Similarly, the upper part of the inner louver 41 means the part of points a to c from the upper end (tip) 41a to the inner surface 41b.
Similarly, the lower portion of the outer louver 31 means a portion between points C to E from the intermediate inclined portion 31c to the lower end inclined portion 31d, and the lower portion of the inner louver means the lower portion of the inner louver from the intermediate inclined portion 41c to the lower end inclined portion. It means the part from c point to e point up to 41d.

Next, the symmetrical arrangement relationship between the outer louver 31 and the inner louver 41 in the case where the outer louver layer 30 and the inner louver layer 40 are spaced apart and arranged symmetrically will be described.
In the first embodiment of the present invention, the external louver layer 30 and the internal louver layer 40 that are arranged to face each other are composed of seven external louvers 31 and internal louvers 41 in seven steps as described above. The outer louver 31 and the inner louver 41 which are configured and located on the same stage are arranged so as to face each other. In each step, the outer surface portion 31b of the outer louver 31 is provided so as to be flush with the outer end portion 13a of the side plate 13 of the outer frame 10, and the inner louver 41 is separated from the outer louver 31 and is The inner surface portion 41 b is provided so as to be flush with the inner end portion 13 b of the side plate 13 on the opposite side of the outer frame 10, and the inclined surfaces of both louvers are arranged to face each other.

In such an opposing arrangement, the tip (point A) of the external louver 31 at the same stage is positioned slightly above the tip (point a) of the internal louver 41, while the lower end (point e) of the internal louver 41 is The external louver 31 is disposed so as to be positioned slightly below the lower end (point E). Further, the lower end of the inner louver 41 and the lower end of the outer louver 31 that are arranged to face each other are arranged close to each other.
Thus, by positioning the lower end (point e) of the internal louver 41 below the lower end (point E) of the external louver 31, a gap is formed between the lower ends E-e of both. It has become. It should be noted that, contrary to this example, this gap may be formed by positioning the lower end (point e) of the internal louver 41 above the lower end (point E) of the external louver 31. is there.
In addition, the tip positions (E, E,..., E, e,...) Of the lower ends of the louvers in each of the two stages are along an extension line X for convenience of imagining the intermediate position of both louver layers, as shown in FIG. As shown in (b), they are arranged so as to be aligned. It should be noted that the lower ends of both need only reach the position of the extension line X, and do not need to reach the position of the extension line X in a strict sense. The point is that the gap should be formed between the lower ends of the two.
In the first embodiment of the present invention, the rainwater droplets separated from the wind and rain can be guided downward by the inclined surfaces of the lower end inclined portions 31d and 41d of both louvers and discharged through the gap.

(Transparent blocking structure)
In each stage, the lower ends (points E and e) of both upper louvers are provided so as to be positioned below the positions of the tips (points A and a) of the upper ends of both lower louvers. By arranging both louvers in this way, the lower ends (points E and e) of the upper louvers are inserted between the upper ends (points A and a) of the lower louvers. L is formed in a V-shaped see-through blocking structure in which the inside cannot be seen through from the outside of the housing 2 through the external louver layer 30.

  As shown in FIG. 3 (a), an auxiliary louver 32 is provided below the outer louver 31 at the lowest stage of the external louver layer 30. A gap is provided between the inclined surface of the plate 14 and the rainwater dripping on the inclined surface of the lower plate 14 is allowed to pass therethrough. A lower plate inner edge 14a bent perpendicularly from the inner end is formed at the inner end of the lower plate 14. The lower plate inner edge 14a is formed with a rising edge as an inner surface portion, and its tip is bent horizontally as shown in FIG. 3 (a) and is similar to the upper end portion of the inner louver 41. A tip is formed. A lower ventilation path is formed at the lower end of the vent 3 by the inclined surface of the lower plate 14 having the lower inner edge 14a and the auxiliary louver 32.

  The auxiliary louver 32 disposed under the outer louver layer 30 has a cross-sectional shape formed in a shape similar to the shape from the point A (tip) to the point D (bending point) of the outer louver 31. The lower end portion that follows this is formed with a blocking portion having a vertical cross-sectional shape. That is, the upper half portion of the auxiliary louver 32 is formed in the same cross-sectional shape as the upper end inclined portion 31a, the planar outer surface portion 31b, and the intermediate inclined portion 31c of the inclined surface of the outer louver 31, and this intermediate inclined portion. Subsequent to 31c, the lower end portion is formed as a blocking portion that blocks the blow-through. A gap is formed between the lower end of the auxiliary louver 32 and the inclined surface of the lower plate 14 to allow rainwater to flow down to the outside of the housing 2.

  Further, the upper end of the outer louver layer 30 is formed so that the lower end of the blocking piece 12a of the outer frame 10 enters between the upper ends of both uppermost louvers. Between the upper end inclined part of the louver 32 and the horizontally bent front end part of the lower plate 14, the lower end of both lowermost louvers are arranged so as to enter. As a result, the upper and lower end portions of the external louver layer 30 are also formed in a see-through blocking structure that cannot be seen through from the outside of the housing 2.

(About air passage between louvers)
As shown in FIG. 3 (b), the upper external louver 31 and the internal louver 41, which are arranged to face each other at each level, and the lower external louver 31 and the internal louver 41 are indicated by phantom lines. As described above, a plurality of outside air passages communicating from the outside to the inside of the housing 2 are formed. This ventilation path is defined between the side plates 13 and 13 of the outer frame 10 and each louver, and has a uniform cross-sectional area over the longitudinal direction of the louver.
As shown in the drawing, the size of the outside air introduction opening formed by the louver interval between the louvers formed between the lower portion of the upper external louver 31 and the tip (portion A) of the lower external louver 31. As shown by the diameter of the phantom line circle in FIG. 3B, the air passage is formed so that the size of the air passage cross-sectional area is maintained at least through the air passage to the opening on the outlet side. Yes.

(Rainwater rainwater separation action)
Next, the rainwater separation action of the louver structure L of the first embodiment will be described with reference to FIGS. 3 (a) and 3 (b). In this description, the action of separating rainwater from the wind and rain introduced into the ventilation path formed between the first and second outer louvers 31 and the inner louvers 41 from the top shown in FIG. In the drawing, the reference numerals of points A to E of the second and third outer louvers 31 and points a to e of the inner louver 41 are omitted. In the following description, the rainwater separating action of the ventilation path formed between the first and second louvers will be described with the second louver as the center.

  The introduction opening on the outside of the housing 2 through which the outside air enters is the tip (point A) of the second-stage external louver 31 in the figure and the intermediate inclined portion 31c (of the CD) of the first-stage external louver 31. It is shown as the inlet of the air passage formed by the distance between the part). Similarly, the lead-out opening on the inner side of the housing 2 is formed between the tip (point a) of the internal louver 41 and the intermediate inclined portion 41c (c-d portion) of the first-stage internal louver 41 as an outlet of the air passage. Indicated by the distance between. As shown by the diameter of the phantom line circle in the figure, the cross-sectional areas of the air passages of the introduction opening and the lead-out opening are formed substantially equal.

  The wind and rain of the outside air introduced into the ventilation path is between each louver, between A-B-C-D-E on the external louver 31 side in FIG. 3B, and e on the inner louver 41 side. -D-c-b-a, the louver interval between the louvers is larger than the interval between the introduction openings (corresponding to the diameter of the phantom line circle) between A-B-C-D, Since the air passage cross-sectional area of the outside air increases and the volume also increases, in the air passage portion of the outside air on the side of the external louver layer 30 formed so as to increase the air passage cross-sectional area, from the introduction opening at point A The outside air that has entered the ventilation path has a larger volume than that at the time of intrusion between the A-B-C-D, the pressure is once reduced, and the outside air including the rainwater that has been taken in expands, so that Can be effectively separated There. Thereafter, the distance (De) between the lower portion (point D) of the intermediate inclined portion 31c of the outer louver 31 and the lower end (point e) of the first-stage inner louver 41 is approximately the same as the introduction opening. However, when the air passes through the lower part (point D) and again enters the air passage portion between dc-b-a on the inner louver 41 side, the air passage cross-sectional area of the outside air As a result, the internal louver layer 40 is formed such that the air passage cross-sectional area of the outside air in the introduction opening is continuously maintained at least from the inlet to the outlet of the air passage. Also on the side, the raindrops can be effectively separated from the wind and rain.

(About swirl)
In the present embodiment, the cross section of the outer louver 31 is A-B-C-D, which is a bent portion of a cross-section, and the cross-section of the inner louver 41 is a cross-section of a bent portion of a U-shape. As the cross-sectional area of the air passage is greatly expanded between -ba, the vortex flow along the louver surface is generated as shown by the arrow in the figure, and the adhesion of water droplet components due to the centrifugal force of the vortex effect is also promoted Therefore, the effect of separating raindrops is further improved.

  On the other hand, at the upper end of the louver structure L, an upper air passage is formed between the surface of the blocking piece 12a of the upper plate 12 and the outer louver 31 and the inner louver 41. A lower air passage is formed between the lower end of the auxiliary louver 32 and the inclined surface of the lower plate 14. Also in the upper and lower ventilation paths, rain water droplets can be effectively separated from the wind and rain.

As described above, the louver structure L of the first embodiment includes the inclined portions provided at the lower portions of the external louvers 31 and the internal louvers 41 that are arranged to face the external louver layer 30 and the internal louver layer 40. The rainwater separated from the wind and rain can be collected so as to be concentrated in the lower center of the louver structure L, and the collected rainwater is dropped downward sequentially from the gap formed in the longitudinal direction of the louver. Since it is discharged, there is no possibility of clogging due to dust or the like clogging in this gap. In addition, since the gap is a slit-like gap formed by shifting both the inclined portions, it is possible to discharge even large dust that cannot be discharged conventionally.
In addition, the louver structure L of the first embodiment is a V-shaped see-through blocking structure and forms a ventilation path that changes the ventilation direction from the descending path to the ascending path. Effective separation and high noise blocking effect outside the housing.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the second embodiment, as shown in FIGS. 4A and 4B, the outer louver layer 30 is provided between the inner frame side plates 15 and 15 so as to be detachable from the outer frame 10. It is characterized by having a louver structure. This will be described in detail below. In the figure, the same reference numerals as those in the first embodiment denote the same members or structures as those in the first embodiment.
As shown in FIG. 4 (a), in the separately formed louver structure, the outer louvers 31, 31,... Constituting the outer louver layer 30 are attached between the inner frame side plates 15, 15 by welding, screws or the like. Thus, an external louver frame including the external louver layer 30 is configured.
On the other hand, the internal louver frame including the internal louver layer 40 has the same configuration as that of the first embodiment, and the internal louvers 41, 41,... Are attached between the side plates 13, 13 of the outer frame 10 by welding, screws, or the like. It consists of
As shown by a white arrow in FIG. 4A, an external louver frame body is fitted into the outer frame 10 from the outside as shown in FIG. 4B, and the same external louver layer as in the first embodiment. 30 and the inner louver layer 40 form a detachable louver structure in which the louvers are symmetrically opposed.

The means for attaching the outer louver frame to the outer frame 10 may be any appropriate attaching means, for example, projecting from the frame portion of the outer frame 10 (not shown) to the surface side to form an attachment piece, Screwing into the screw hole of the mounting piece from the inner side or the outer side of the outer frame 10 by means of mounting screws or the like through screw holes formed at both ends of the outer surface of the external louver 31 and the auxiliary louver 32 The attachment means such as detachably attaching may be adopted.
Even when the louver structure of the detachable configuration according to the second embodiment is used, the rainwater separation action can be performed in the same manner as in the first embodiment.
According to the configuration of the second embodiment, by removing the external louver frame from the outer frame 10, maintenance such as cleaning performed as needed is easy. For example, a gap between the external louver 31 and the internal louver 41. Even when a foreign object or the like that cannot be naturally removed is caught, the external louver frame body can be removed from the outer frame 10 to easily remove the foreign object or the like. Further, when the external louver layer 30 is damaged, it is only necessary to remove the external louver frame from the outer frame 10 and replace the external louver layer 30, so that the parts can be easily replaced.

  The present invention is not limited to the contents described in the first and second embodiments, and can be appropriately changed without departing from the technical concept described in the claims. For example, the cross-sectional form of the outer louver 31 may be formed on an inclined surface that is linear between A-B-C and C-D-E shown in FIG. The cross-sectional form may be formed on an inclined surface that is linear between a-b-c and cd-e shown in FIG. If it does in this way, it can have the shape which made the shape of the external louver and the internal louver the cross-sectional shape of a cross-section, and the cross-section reverse-shape, and manufacture of the louver structure L becomes easy. Further, the blocking piece 12a of the upper plate 12 has a function of preventing wind and rain from blowing through the upper portion of the outer frame 10 into the housing 2, but the bent portion is as shown in the figure. The position is not limited to the center of the depth width of the side plate 13 and may be appropriately changed as long as the position has a function of preventing blow-through.

DESCRIPTION OF SYMBOLS 1 Engine drive work machine 2 Case 3 Vent 10 Outer frame 11 Flange frame 12 Upper plate 12a Blocking piece 13 Side plate 14 Lower plate 15 Inner frame side plate 20 Cover 30 External louver layer 31 External louver 32 Auxiliary louver 40 Internal louver layer 41 Inside Louver L Louver structure X Extension line E Engine W Working machine

Claims (6)

An engine-driven work machine having a louvered vent on the side of a housing that houses an engine, work machine, etc.
The vent includes an outer frame including an upper plate, a lower plate, and side plates on both sides,
The louver structure is an inner / outer double louver layer in which an outer louver layer and an inner louver layer, each of which is provided between a side plate of the outer frame and is provided at intervals, are symmetrically arranged to face each other. Structure,
The louvers at each stage of the louver layers arranged opposite to each other are arranged such that the lower ends of the outer louvers and the lower ends of the inner louvers that are inclined downward facing each other are close to each other, Forming a V-shaped air passage communicating with the internal louver from the outside of the housing to the inside;
Forming a gap between the lower end of the outer louver and the lower end of the inner louver that are close to each other;
Of the lower end of the outer louver and the lower end of the inner louver that form the gap, at least one of the lower ends is arranged at a position below the upper end of the lower external louver,
The upper plate of the outer frame has a blocking piece bent to the middle position of both louvers whose tip is positioned below the upper end of the uppermost outer louver and the upper end of the inner louver,
The lower plate of the outer frame has a lower plate inner rim positioned at the lower end of the lowermost external louver or the lower end of the inner louver. Engine-driven work machine equipped with. The ventilation of the louver structure according to claim 1, wherein the V-shaped air passage is formed so as to maintain at least a cross-sectional area of the air passage in an opening portion between external louvers in the air passage. Engine-driven work machine with a mouth.   The outer louver is formed in a cross-sectional shape with a bent top located on the outer side, and the inner louver is formed in a reverse-shaped cross-section with a bent top located on the inner side. An engine-driven work machine comprising a louvered vent according to claim 1 or 2.   The lower end of one of the lower end of the outer louver and the lower end of the inner louver forming the gap is a position shifted downward from the other lower end. The engine drive working machine provided with the vent of the louver structure described in the item.   The engine having a vent of the louver structure according to any one of claims 1 to 4, wherein an upper end portion of the internal louver is bent and formed as a baffle plate protruding into the air passage. Drive working machine.   6. The engine drive equipped with a louver structure vent according to any one of claims 1 to 5, wherein the outer louver layer is formed to be detachable from an outer frame of the vent. Work machine.

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