JPH03921A - Shroud - Google Patents

Abstract

PURPOSE:To particularly save a cost in a die, and perform production each a low cost by separately arranging a shroud plate and a shroud ring, and separately forming a plurality of continuous pieces blow-molded in order to compose the shroud ring. CONSTITUTION:A shroud 3 is, for example, installed one radiating surface of a condenser, and composed of a sideway long rectangular shroud plate 4 and a small-sized circular shroud ring 5. In the shroud plate 4, substantially samely shaped base plates 4a, 4b which are prepared by puching stainless steel pipe are arranged, both cutouts 6, 7 thereof being opposed to each other, while both ends and center parts are connected to each other by means of connection pieces 8 to 10. With regard to the shroud ring 5, for instance, a plurality of number is simultaneously blow-molded from thermoplastic resin such as hard polyethylene, then cut along border lines of each ring 5.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a shroud suitable for, for example, an air conditioner for a large vehicle or the like.

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

As shown in, for example, Japanese Utility Model Application Publication No. 56-136127, the shroud includes a substantially flat shroud plate with an opening formed in the center, and a hood-shaped shroud link protruding from the periphery of the opening, As in the publication, these were integrally molded from synthetic resin or separately manufactured by press molding and then spot welded.

(Problem to be solved by the invention) However, with this method of manufacturing shrouds, shrouds made of sheet metal require complicated drawing processes during press molding, resulting in high costs, and shrouds made of synthetic resin require molding costs. However, there was a problem in that it became expensive, leading to high costs.

In particular, for air conditioner shrouds that are installed on large vehicles such as buses and trains, the molds and molds are large and the cost of these molds is expensive, and the number of units produced is much larger than that for passenger cars. There was a problem that it was relatively expensive because it was small in number.

The present invention solves these problems by separately providing a shroud plate and a shroud link, and by rationally molding the shroud ring by blow molding.
To provide a shroud that can be manufactured at low cost by suppressing high costs due to mold costs.

(Means for Solving the Problems) Therefore, in the shroud of the present invention, the shroud plate and the shroud ring are separately provided in the shroud in which the shroud ring is protruded from the shroud plate, and the mold required for processing these can be made smaller and lighter. In addition, by constructing the shroud plate by connecting multiple base plates of the same shape, we aim to reduce the size and weight of the mold required to manufacture the shroud plate and reduce the mold cost. By dividing and configuring multiple molded shroud rings, it is possible to make multiple shroud rings by blow molding, thereby reducing the mold cost for the rings and suppressing the high cost. It is a feature.

(Example) Hereinafter, an illustrated example in which the present invention is applied to an air conditioner for a large bus will be described. In FIGS. 1 to 14,
1 is a capacitor installed in the air conditioner, and a capacitor cover 2 is attached to one heat radiating surface, and a shroud 3 is attached to the other heat radiating surface.

The shroud 3 is composed of a shroud plate 4 in the form of a horizontally long rectangular plate and a shroud link 5 in the form of a short and small substantially circular tube, and in this embodiment, two shroud links 5 are provided.

Among these, the shroud plate 4 has a pair of substantially identical base plates 4a and 4b, which are made by punching and molding stainless steel plates, for example.
As shown in FIGS. 7 and 8, a and 4b are horizontally long plates 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 on the long side edge of one side thereof.

The plates 4a and 4b are spaced apart with their notches 5.6 facing each other, and both ends and the center thereof are
They are connected by connecting pieces 8, 9 and 10.

The connecting piece 8.9.10 is formed by bending a stainless steel plate, for example, and the connecting piece 8.10 is fixed to both ends of the plates 4a, 4b by spot welding or the like,
These are constructed in substantially the same way as shown in FIG.

That is, the connection piece 8. IO is the base plate 4a
, a flat main piece 8a, loa that can be joined to the back surface of the main pieces 8a, 4b, and a bent piece 8b, job, which overhangs laterally from the center of the main pieces 8a, 10a, and has its overhanging end raised at a right angle. A pair of rivet holes 11.1 are provided in the bent pieces sb and iob.
2 is formed.

The connecting piece 9 is spot welded to the center of the base plates 4a and 4b, and is formed into an abbreviated cross-section as shown in FIG. A shaped main piece 9a is disposed, and the bent piece 8b is provided in the central part.

A bent piece 8b having the same shape as 10b is formed upright, and a pair of rivet holes 13 are formed in the bent piece 9b.

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

On the other hand, the shroud link 5 is constructed by blow molding a thermoplastic resin such as hard polyethylene, and includes, for example, two to six rings 5.

Or, using a mold that can simultaneously mold more than one mold, the 14th
As shown in the figure, it is manufactured by simultaneously molding a plurality of shroud links 5 and cutting them along the boundaries of each ring 5 after molding.

As shown in FIGS. 9 to 13, the shroud link 5 manufactured in this manner has a circumferential surface 5a that is approximately curved inward, and has beads 17, 17 protruding from its side ends. A pair of recesses 18 are provided at a distance in the diametrical direction of the circumferential surface 5a, and the bead 17 on one side is curved inwardly, and the bead 17a defined by these recesses 18. is forming.

Around the bead 17 position on the opposite side to the bead 17a,
As shown on the right in FIG. 1O and in FIG.
and the bent pieces 8b, 9b.

10b can be joined, and a rivet hole 20 having the same diameter as the rivet hole 11, 12, 13 is formed at a spaced apart position.

In addition, a plurality of through holes 21 are formed at the same pitch as the rivet holes 14, 14 on the peripheral surface of the base of the bead 17 on the opposite side to the bead 17a, that is, the bead 17 that can be seated on the shroud plate 4. A 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 dogleg shape, and a rivet 24 made of, for example, hard rubber is fitted into a through hole 23 formed at the end thereof. A rivet similar to the above rivet 24,
Reference numeral 26 denotes a motor mounting bracket fixed at an appropriate position on the capacitor 1. A fan motor 27 is held on the bracket 26, and a fan 28 fixed on a drive shaft (not shown) of the motor 27 is mounted on the opening of the shroud ring 5. It is set up facing the 29 is a receiver tank, and 30 is a refrigerant conduit.

(Function) When manufacturing the shroud 3 configured as described above, the shroud plate 4 and the shroud link 5 are manufactured separately, and these are assembled according to a predetermined procedure.

First, when manufacturing the shroud plate 4, a pair of base plates 4a and 4b are punched out using a press, and connection pieces 8, 9, and 10 that connect them are press-molded and placed.

In this case, the shroud plate 4 is the base plate 4
Since it is composed of three parts a and 4b, the molding die can be made smaller and lighter, and the cost of the mold can be lowered, compared to a single-part construction.

In addition, since the plates 4a and 4b have the same shape, they can be handled with virtually one type of mold, which further reduces the cost of the mold, and the plates 4a and 4b can be manufactured by punching. Therefore, it is easier to process than conventional ones that require drawing.

Next, a pair of base plates 4a and 4b manufactured in this way
are spaced apart with each notch 6.7 facing each other, and the manufactured connection pieces 8. Apply each main piece 8a, 10a, 9a of to, 9 from the back side, align their rivet holes 15, 16, and interpose each bent piece 8b, 10b, 9b between the plates 4a, 4b. Then, maintain this state using appropriate means such as a jig.

Under such circumstances, each connection piece 8.91O and
The base plates 4a and 4b are spot welded to connect them together.

The plate assembly assembled in this way is
As shown in FIG. 7, approximately circular openings formed by the cutouts 6.7 are formed adjacent to each other in the length direction of the shroud plate 4, and bent pieces are provided at both ends and adjacent portions of these openings. 8b, 10b, and 9b are protruded in a horizontal line.

On the other hand, when manufacturing the shroud ring 5, the shroud ring 5 is manufactured by known blow molding using a mold that can simultaneously mold two to six or more rings. A tube-shaped parison is formed by extruding or injecting the plastic resin, the parison is sandwiched between molds, and air is blown into the inside to inflate it, which is then cooled and solidified.

As shown in FIG. 14, the shroud link 5 thus formed is formed by continuously forming a plurality of shroud links 5 into a tube shape. , - it becomes possible to produce a plurality of rings 5 at times.

That is, the manufacturing method of the shroud link 5 as described above makes it possible to mass-produce the ring 5, and even if the required number of shroud rings 5 to be installed differs depending on the specifications of the air conditioner, it is possible to manufacture the shroud ring 5 according to the above specifications. There is no need to manufacture molds for two-cavity or three-cavity molds, and one type of mold as described above can be used, resulting in a reduction in mold costs and a reduction in the unit price of the shroud link 5. In addition, the circumferential surface of the opening end of the shroud link 5 is
As shown in the figure, the opening diameter increases toward the end in order to increase air volume and reduce noise, so it is shaped like a bell mouth. Not only is it difficult to process, but the processing cost is also very high, making it difficult to use.Moreover, if this is molded with resin using a normal method, it becomes difficult to cut out the mold, making it difficult to use.

Compared to such processing methods, blow molding does not have the above-mentioned problems and can be molded easily and inexpensively.
Blow molding is suitable and practical for molding bell mouths.

In this way, a desired number of shroud links 5, two needles in this example, are cut out from the group of molded shroud rings 5, and after their cut surfaces and dimensions are prepared, they are attached to the assembled plate assembly.

That is, the bead 1 on the seating side of the shroud link 5.5
7, the plates 4a, 4b around the opening of the notch 6.7
the bending pieces 8b, 9b, 10
b and each rivet hole 11.12.1
3 and rivet hole 20, and rivet hole 14 and through hole 2I
Align each position.

Then, the rivet 25 is pushed into the holes 11, 12, 13 and the rivet hole 20, and through the elasticity and engagement of the rivet 20, the shroud link 55 is bent into the bent pieces 8b, 9b.
, 10b.

Next, insert the bent part 22a of the clip 22 into the through hole 21, align the rivet hole 23 at the other end with the rivet hole 14, push the rivet 24 into these, and insert the rivet 24 through the rivet 24 and the clip 22. The shroud ring 5.5 is fixed on the base plates 4a, 4b.

In this way, the shroud ring 5.5 is fixed on the shroud plate 4 as shown in FIGS. 4 and 5, but when installing the ring 5.5, the rivets 25.2 Since the so-called one-touch operation by pressing the button 4 degrees is sufficient, the above-mentioned operation can be performed easily and quickly.

This is the shroud assembly assembled in this way.

After that, the shell plate 4 is positioned on one side of the heat dissipation surface of the capacitor l, and the connection piece 8 fixed to the plate 4 and the back surface thereof. A bolt (path shown) is inserted into the bolt insertion hole 1516 of lO, and this is tightened with a nut to attach it to the capacitor l.

After that, the motor mounting bracket 26 is attached to the appropriate position of the capacitor l, and the motor 2 is attached to the bracket 26.
7 and is integral with the motor 27.
8 may be positioned at the opening of the shroud link 55.

(Effects of the Invention) As described above, the shroud of the present invention has a shroud ring protruding from the shroud plate.
Because the shroud plate and shroud ring are separate, the molds required for these processes can be made smaller and lighter, and the cost of molds can be reduced.Also, since the shroud plate is constructed by connecting multiple pace plates of the same shape, the shroud The plate can be processed with one type of mold, and the mold is smaller and lighter and the cost of the mold is lower, which has the effect of suppressing the high cost of the shroud.

In addition, since the shroud link of the present invention is manufactured by blow molding, it is easier to manufacture this type of ring, which is normally formed in a bell mouth shape, than when manufacturing it by sheet metal processing or ordinary resin molding. Moreover, it can be manufactured at a low cost, and has an effect suitable for manufacturing this type of ring.

Moreover, in the present invention, since the shroud ring is constructed by dividing the multiple blow-molded shroud rings, it is possible to obtain multiple shroud rings by blow molding, and it is also possible to install multiple shroud rings. ,
Since it can be handled with one type of mold, the design of the mold and the production of the shroud ring can be done rationally, and the unit price for the 4° mold of the ring can be reduced, which has the effect of suppressing the high cost. .

This effect is particularly important because when a large shroud is installed, such as in an air conditioner mounted on a large vehicle such as a bus or train, the cost of the mold required to process the shroud becomes expensive.
This has the advantage of solving the problem that the cost of the shroud is relatively high compared to that of a passenger car.

[Brief explanation of drawings]

Fig. 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. A plan view, FIG. 5 is a front view of FIG. 4, FIG. 6 is an enlarged sectional view taken along line A-A in FIG. 8 is an exploded perspective view of the shroud plate, FIG. 9 is a plan view showing a half of the shroud ring applied to the present invention, and FIG. 10 is a front view of FIG. 9, with one half shown. A cross-sectional view is shown, and Fig. 11 is B in Fig. 9.
- A cross-sectional view along line B, FIG. 12 is a cross-sectional view along line C-C in FIG. 9, FIG. 13 is a cross-sectional view along line D-D in FIG. 9,
FIG. 14 is a front view showing a state in which the shroud link applied to the present invention is molded at multiple speeds by blow molding. 6 3... Shroud 4... Shroud plate 4a
, 4b... Base plate 5... Shroud ring l Eji: 7

Claims (1)

[Claims] In a shroud in which a shroud ring is protruded from a shroud plate, the shroud plate and the shroud ring are provided separately, and the shroud plate is constructed by connecting a plurality of base plates of the same shape, and the shroud ring is formed by blow-molding multiple shrouds. A shroud characterized by a ring that is divided into parts.