JPH0612060B2 - Shroud - Google Patents

Description

TECHNICAL FIELD The present invention relates to a shroud suitable for an air conditioner for a large vehicle, for example.

(Prior Art) For example, in a condenser of an air conditioner for a vehicle, a heat radiating surface on one side is covered with a shroud, and a blower is installed in an opening of the shroud to enhance a cooling effect of the condenser and promote heat exchange. There is.

The shroud includes, for example, as shown in Japanese Utility Model Application Laid-Open No. 56-136127, a substantially flat plate-shaped shroud plate having a central opening, and a hood-shaped shroud ring projecting from the periphery of the opening. They are integrally molded with a synthetic resin as in the above publication, or separately molded by press molding, and spot-welded.

(Problems to be solved by the invention) However, in such a shroud manufacturing method, a sheet metal product requires complicated drawing for press molding, resulting in high cost, and a synthetic resin product has a mold cost. However, there is a problem that the cost becomes high and the cost becomes high.

In particular, in shrouds for air conditioners installed in large vehicles such as buses and trains, molds and molding dies become large in size, and the cost of those molds becomes expensive. There was a problem that it was expensive because it was very small.

The present invention solves such a problem, by separately providing a shroud plate and a shroud ring, and by reasonably molding the shroud ring by blow molding,
While reducing the cost due to the die cost and making it possible to manufacture it at low cost, it is possible to reduce the size and weight of a large shroud with multiple fan ventilation openings, reduce the die cost of the shroud plate, and reduce the shroud ring. It is an object of the present invention to provide a shroud capable of strengthening the attachment strength of the shroud and suppressing generation of abnormal noise due to air flow.

(Means for Solving the Problem) Therefore, the shroud of the present invention divides the shroud plate into two parts, forms substantially semicircular cutouts at the respective end edges thereof, and these cutouts are made to face each other. In a shroud that connects plates and attaches a separate shroud ring to the periphery of the opening of the notch, a pair of identical flat plate-shaped shroud plates in which a plurality of substantially semicircular notches are formed in close proximity are provided. A projecting piece that is integral with the connecting piece that connects the shroud plate is disposed between the ends of the facing notches so that the projecting height of the projecting piece is less than half the height of the shroud ring. A flat joining surface that can engage with the projecting piece is formed at a diametrical position on the mounting side peripheral surface of the ring, and the joining surface is closely fixed to the projecting piece, and a plurality of shroud rings are mounted adjacent to each other. The shroud can be made smaller and lighter, and the cost of the shroud plate can be reduced, making it suitable for large heat exchangers, strengthening the mounting strength of the shroud ring, and generating abnormal noise due to air flow. The feature is that it is possible to suppress.

(Embodiment) An illustrated embodiment in which the present invention is applied to an air conditioner for a large-sized bus will be described below with reference to Figs. 1 to 14.
Reference numeral 1 denotes a capacitor provided in the air conditioner, a capacitor cover 2 is attached to one of the heat radiation surfaces, and a shroud 3 is attached to the other heat radiation surface.

The shroud 3 is composed of a horizontally long rectangular plate-shaped shroud plate 4 and a short and small substantially tubular shroud ring 5. In this embodiment, two shroud rings 5 are provided.

Among these, the shroud plate 4 has a pair of substantially identical base plates 4a and 4b formed by punching out a stainless steel plate, for example. These plates 4
As shown in FIGS. 7 and 8, a and 4b are horizontally long plate bodies obtained by dividing the plate 4 into two in the short side direction,
A pair of semicircular notches 6 and 7 capable of accommodating a fan to be described later is formed in the long side circle on one side thereof.

The plates 4a and 4b are arranged so that their cutouts 5 and 6 face each other and are spaced apart from each other.
The connection pieces 8, 9, 10 are connected.

The connection pieces 8, 9 and 10 are formed by bending, for example, a stainless steel plate, and the connection pieces 8 and 10 are fixed to both ends of the plates 4a and 4b by spot welding or the like.
These have substantially the same structure as shown in FIG.
That is, the connection pieces 8 and 10 are the same as the base plate 4
flat plate-like main pieces 8a, 10a that can be joined to the back surfaces of a, 4b
And a pair of rivet steels 11 and 12 projecting laterally from the center of the main pieces 8a and 10a, and projecting ends 8b and 10b formed by standing up the projecting ends at right angles. Is formed.

Further, the connecting piece 9 is spot-welded to the central position of the base plates 4a and 4b, which is formed in a substantially L-shaped cross section as shown in FIG. 8, and the flat plate forming the cross section is formed on both sides except the central part. -Shaped main piece 9a is provided, a protruding piece 9b having the same shape as the protruding pieces 8b and 10b is formed upright in the central portion, and a pair of rivet holes 13 are formed in the protruding piece 9b.

The bending or projecting height of each of the projecting pieces 8b, 9b, 10b is formed to be half or less of the height of the shroud ring 5 in the tube axis direction, and the size and weight of the shroud are reduced.

In the figure, 14 is a rivet hole formed around the opening of the cutouts 6 and 7, and 15 and 16 are bolt insertion holes formed in the base plates 4a and 4b and the main pieces 8a and 10a.

On the other hand, the shroud ring 5 is formed by blow molding a thermoplastic resin such as hard polyethylene. For example, the shroud ring 5 is formed by using a molding die capable of simultaneously molding 2 to 6 or more of the rings 5 described above. As shown in FIG. 14, a plurality of shroud rings 5 are molded at the same time, and after molding, the shroud rings 5 are cut along the boundary of each ring 5 to manufacture.

As shown in FIGS. 9 to 13, the shroud ring 5 manufactured in this manner has a substantially curved peripheral surface 5a on the inside thereof, and beads 17 and 17 project from the side ends thereof. In the diametrical direction of the peripheral surface 5a, a pair of concave portions 18 in which one bead 17 is curvedly formed inwardly are provided apart from each other, and the bead 17a defined by these concave portions 18 is linearly tangentially formed. Is forming.

Around the position of the bead 17 on the opposite side of the bead 17a, that is, on the peripheral surface of the attachment side of the shroud ring 5, as shown in FIGS. 10 and 11, a horizontally long joint surface 19 having substantially the same plane as the bead 17a is provided. The protruding pieces 8b, 9b, 10b are formed on the surface 19 so that the protruding pieces 8b, 9b, 10b can be joined to each other, and rivet holes 20 having the same diameter as the rivet holes 11, 12, 13 are formed at the separated positions.

A plurality of through holes 21 are formed at the same pitch as the rivet holes 14 and 14 on the bead 17 on the side opposite to the bead 17a, that is, on the peripheral surface of the base of the bead 17 that can be seated on the shroud plate 4. The bent portion 22a of the clip 22 is engaged with the hole 21.

The clip 22 is formed by bending a stainless steel plate or the like into a substantially V shape, and a rivet 24 made of, for example, hard rubber is fitted in a through hole 23 formed at the end thereof.

In addition, in the figure, 25 is a rivet similar to the rivet 24, 26 is a motor mounting bracket fixed to an appropriate position of the condenser 1, and a fan motor 27 is attached to the bracket 26.
The fan 28 fixed to the drive shaft (not shown) of the motor 27 is installed so as to face the opening of the shroud ring 5. 29 is a receiver tank and 30 is a refrigerant conduit.

(Operation) When manufacturing the shroud 3 configured in this way, the shroud plate 4 and the shroud ring 5 are separately manufactured, and these are assembled in a predetermined procedure.

First, in the case of manufacturing the shroud plate 4, the pair of base plates 4a and 4b are punched by a press, and the connecting pieces 8, 9 and 10 for connecting them are press-molded and placed.

In this case, the shroud plate 4 is the base plate 4
Since it is composed of two parts a and 4b, it is possible to reduce the size and weight of the molding die and to reduce the cost of the mold, as compared with the case where it is constructed as a single part.

Further, since the plates 4a and 4b are configured in the same shape, it is possible to use substantially one type of mold, which can reduce the cost of the mold and also to form a pair of notches 6 in the plates 4a and 4b. , 7 are arranged close to each other, the base plates 4a, 4b are made compact as compared with the case where they are arranged separately.

Moreover, the plates 4a and 4b are formed in a flat plate shape,
Since it is not a hood like the conventional one, it is manufactured by punching, compared to the conventional one that requires drawing processing,
Processing becomes easy.

Next, the pair of base plates 4a and 4b thus manufactured
The respective cutouts 6 and 7 are opposed to each other and are spaced apart from each other, and the main pieces 8a, 10a, 10a, 10a, 9a is applied from the back side, the rivet holes 15 and 16 are aligned with each other, and the projecting pieces 8b, 10b and 9b are interposed between the plates 4a and 4b, and the state is appropriately adjusted by a jig or the like. Hold in.

Then, under such a condition, each connecting piece 8, 9, 10
Then, the base plates 4a and 4b are spot-welded to integrally connect them.

The plate assembly assembled in this way is
As shown in FIG. 7, substantially circular openings formed by the cutouts 6 and 7 are formed adjacent to each other in the lengthwise direction of the shroud plate 4, and projecting pieces are formed at both ends of the openings and adjacent portions. 8b, 10b and 9b are projected in a horizontal single row.

On the other hand, when the shroud ring 5 is manufactured, the shroud ring 5 is manufactured by a known blow molding using a molding die capable of simultaneously molding two to six rings or more. For example, a thermoplastic resin such as hard polyethylene is extruded or injected to form a tubular parison, the parison is sandwiched between molds, and air is blown into the parison to inflate it, which is then cooled and solidified.

As shown in FIG. 14, the shroud ring 5 thus formed is formed by continuously forming a plurality of shroud rings 5 into a tubular shape. Therefore, if the shroud ring 5 is cut along the boundary between the rings 5 after molding. It is possible to manufacture a plurality of rings 5 at one time.

That is, the manufacturing method of the shroud ring 5 as described above enables mass production of the shroud ring 5, and even if the required number of the shroud rings 5 to be equipped differs depending on the specifications of the air conditioner, Accordingly, it is not necessary to manufacture a molding die for taking two or three pieces, and one type of molding die as described above can be used. As a result, the molding die cost is suppressed and the unit price of the shroud ring 5 is reduced. Moreover, the peripheral surface of the opening end of the shroud ring 5 is
As shown in the figure, for the purpose of increasing air volume and reducing noise, the opening diameter is formed in the so-called bell mouth shape that increases toward the end side. However, it is difficult to use because the processing cost becomes very expensive, and when this is resin-molded by a usual method, die cutting becomes difficult and cannot be adopted.

Compared with such a processing method, blow molding does not have the above-mentioned problems and can be molded easily and inexpensively,
Blow molding is the official and practical method for molding bellmouths.

In this way, the desired number of shroud rings 5, in the example, two shroud rings 5 are separated from the formed group of shroud rings 5, the cut surfaces and dimensions thereof are adjusted, and the shroud rings 5 are attached to the assembled plate assembly.

That is, the bead 1 on the seating side of the shroud rings 5, 5
7 to the plates 4a and 4b around the openings of the notches 6 and 7.
Positioned on the upper side, each joint surface 19 is provided with a protrusion 8b, 9b, 10b
And rivet holes 11, 12, 13
The positions of the rivet hole 20, the rivet hole 14, and the through hole 21 are aligned.

Then, the rivet 25 is pushed into the holes 11, 12, 13 and the rivet hole 20, and the shroud rings 5, 5 are brought into contact with the projecting pieces 8b, 9 through the elasticity and engaging action of the rivet 20.
It is fixed to b and 10b.

Next, the bent portion 22a of the clip 22 is inserted into the through hole 21, and the rivet hole 23 at the other end is aligned with the rivet hole 14, and the rivet 24 is pushed into these, and the rivet 24 and the clip 22 are inserted. The shroud rings 5, 5 are fixed on the base plates 4a, 4b.

In this way, the shroud rings 5 and 5 are fixed on the shroud plate 4 as shown in FIGS. 4 and 5, but when the rings 5 and 5 are attached, the rivets 25 and 24 are attached as described above. Since the so-called one-touch operation by pushing in is sufficient, the above-mentioned work can be performed easily and quickly, and the projecting pieces 8b, 9b, 10b are fixed in close contact with the respective flat joint surfaces 19, so that the contact area between them is wide. As a result, the mounting strength of the shroud ring 5 is enhanced.

Moreover, since the protruding height of the protrusions 8b, 9b, 10b is formed to be half or less of the height of the shroud ring 5,
It is small and lightweight, and in combination with the points described below, it promotes the reduction in size and weight of the shroud, and it is also related to the prevention of air flow turbulence as described later.

In this case, since the single projecting piece 9b or the connecting piece 9 is shared in the adjoining portions of the shroud rings 5, 5, the rings 5, 5 are arranged apart from each other, and the projecting piece or the connecting piece is attached to the respective attachments. The number of parts is reduced and the labor of attaching the rings 5 and 5 is reduced as compared with the required one.

Since the base plates 4a and 4b are flat plate-shaped as described above, the shroud assembly thus assembled is thinner than the conventional hood-shaped one, and the peripheral surfaces of the shroud rings 5 and 5 are closely attached. Since they are connected, they are smaller and shorter than those connected separately.

In addition, the shroud rings 5 and 5 have their circumferential surfaces projected from the protrusions 9b.
Since it is in close contact with and is connected to, the mounting strength thereof is strengthened, and the rigidity of the relevant portion is strengthened, so that it can sufficiently endure vibration and impact.

In the assembly, the shroud plate 4 is then positioned on one side of the heat dissipation surface of the capacitor 1, and the plate 4 and the bolt insertion holes 15 of the connection pieces 8 and 10 fixed to the back surface thereof are provided.
16 and a bolt (not shown) are inserted and tightened with a nut to attach to the capacitor 1.

Then, after that, the motor mounting bracket 26 is attached to an appropriate position of the capacitor 1, and the motor 2 is attached to the bracket 26.
7 and holds the fans 27 and 2 integrated with the motor 27.
8 may be positioned at the openings of the shroud rings 5,5.

In this way, the attached shroud allows air to flow through the shroud rings 5 and 5 in accordance with the air conditioning operation.

At this time, the inner surface of the joint surface 19 is flat, and the shape of the air contact surface is different from that of the other inner surface of the shroud ring 5, that is, the cylindrical surface, which causes a change in the air flow and causes abnormal noise. There is a fear.

However, since the joint surface 19 is formed in a biased manner on the peripheral surface on the mounting side of the shroud ring 5 and the area is made as small as possible to reduce the influence, uneven flow is suppressed and abnormal noise is prevented.

Therefore, the projecting height of the projecting pieces 8b, 9b, 10b is made as low as possible.

(Effect of the invention) As described above, the shroud of the present invention is provided with a pair of identical flat plate-shaped shroud plates in which a plurality of substantially semicircular cutouts are formed in proximity to each other. By making the plate short and small, and by making it flat,
The shroud can be flattened, and the shroud can be made smaller and lighter than the conventional box-shaped or frame-shaped one.

Moreover, the structure of the mold for molding the shroud plate is simpler than that of the conventional box-shaped or frame-shaped one, and the cost of the mold can be reduced.

In particular, this effect is suitable for a large-sized heat exchanger shroud having a plurality of ventilation openings.In addition, a projecting piece integrated with a connecting piece that connects the shroud plate is projected between the ends of the notches that face each other. Since the protrusion height of the protrusion is less than half the height of the shroud ring, the protrusion can be made smaller and lighter, and the shroud can be made smaller and lighter.

Moreover, since a flat joint surface that can be engaged with the projecting piece is formed at a diametrical position on the mounting side peripheral surface of the shroud ring, the joint surface is formed in the entire area of the height of the shroud ring. It is possible to suppress the variation of the air flow flowing in the shroud ring and prevent the generation of abnormal noise.

Furthermore, since the joint surface is closely fixed to the projection piece, a large contact area between the joint surface and the projection piece can be secured, and the attachment strength of the shroud ring can be enhanced accordingly.

In this way, the present invention allows a plurality of shroud rings to be mounted adjacent to each other, so that the shroud can be made smaller and lighter, and there is an effect particularly suitable for a large shroud for a heat exchanger.

[Brief description of drawings]

1 is a plan view showing a capacitor to which the present invention is applied, FIG. 2 is a front view of FIG. 1, FIG. 3 is a right side view of FIG. 2, and FIG. 4 shows an embodiment of the present invention. FIG. 5 is a plan view, FIG. 5 is a front view of FIG. 4, FIG. 6 is an enlarged cross-sectional view taken along the line AA of FIG. 4, and FIG. 7 is a plan view showing a mounting state of a shroud plate applied to the present invention. FIG. 8 is an exploded perspective view of the shroud plate, FIG. 9 is a plan view showing a half portion of a shroud ring applied to the present invention, and FIG. 10 is a front view of FIG. FIG. 11 is a sectional view taken along the line BB of FIG. 9, FIG. 12 is a sectional view taken along the line CC of FIG. 9, and FIG. 13 is a line D-D of FIG. FIG. 14 is a sectional view taken along the line of FIG.
It is a front view showing the state where multiple molding was carried out by blow molding. 3 ... Shroud, 4 ... Shroud plate 4a, 4b ... Base plate 5 ... Shroud ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-58-174114 (JP, A) Actually opened 55-139224 (JP, U) Actually opened 59-54797 (JP, U) Actually opened 58- 57524 (JP, U)

Claims (1)

[Claims] 1. A shroud plate is divided into two parts, and substantially semicircular cutouts are formed at respective end edges of the shroud plate. The cutouts are opposed to each other to connect the shroud plate, and the peripheral edge of the opening of the cutout part. In a shroud with a separate shroud ring attached, a pair of identical flat plate-shaped shroud plates each having a plurality of substantially semicircular cutouts formed in close proximity are provided, and between the ends of the opposed cutouts, A projecting piece that is integral with the connecting piece that connects the shroud plate is arranged so as to project, and the projecting height of the projecting piece is set to half the height of the shroud ring or less, while at the diametrical position of the mounting side peripheral surface of the shroud ring. A shroud characterized in that a flat joining surface that can be engaged with a projecting piece is formed, the joining surface is closely fixed to the projecting piece, and a plurality of shroud rings can be mounted adjacent to each other.