JPH0646239U - Vent cap for large diameter duct - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a vent cap capable of producing a large size without using a large press die that involves a cost risk. In a vent cap having a hood body 3 having a spherical head portion 6 and a cylindrical skirt portion 7, a head member 6p and a skirt portion are formed as separate members. The member 7p is connected to form a hood body. As a result, the cylindrical skirt portion can be formed by a simple process such as roll processing, and the press-molding is required only for the spherical head, so that the press mold can be made small.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vent cap connected to an end of a ventilation duct, and more particularly to a vent cap used for a ventilation duct having a diameter larger than an ordinary one, for example, a diameter of 250 to 300 mm.

[0002]

[Prior art]

 There are various types of vent caps that can be used properly according to the surrounding conditions, etc.However, in general, a vent cap with a hood body for avoiding wind and rain is used in places that are easily exposed to wind and rain. There are various body structures.

[0003] Among them, there is a hood body with a special deep cover in order to increase the function of avoiding wind and rain. As shown in FIG. 5, this hood body has a spherical head H for avoiding accumulation of rain and snow and for reducing rain noise. A cylindrical skirt portion S is extended.

In order to manufacture such a hood body, a symmetrical intermediate body M as shown in FIG. 6 was produced by press molding, and this intermediate body M was divided into two parts. The reason why the symmetric intermediate body is divided into two parts is that if the press forming is performed from the beginning to the final shape, the stress state will be different between the head and the end of the skirt, causing various obstacles. is there.

By the way, recently, the sophistication of the ventilation system has been further advanced, and the frequency of use of the large-diameter ventilation duct has been increased accordingly. The vent cap used for this large-diameter ventilation duct will inevitably increase in size, but there is an obstacle to this increase in size.

That is, an increase in the size of the vent cap, that is, an increase in the size of the hood body inevitably leads to an increase in the size of the intermediate body, but since this intermediate body is twice the size of the hood body, The problem is that the press mold for press molding cannot be easily prepared. In other words, even though demand for large vent caps is increasing, the number of large vent caps is smaller than that of regular sizes, while the cost of the press mold increases sharply as the size of the intermediate body increases, so it is easy to do so. It means that if the press die is prepared, it may not be economically worthwhile.

Further, when the press die becomes large, a proper press equipment is required, but such a large press equipment is not suitable for bent caps of various kinds in a small amount because it cannot turn around too much. .

[0008]

[Problems to be solved by the device]

 Therefore, an object of the present invention is to provide a vent cap that can be manufactured without using a large press die that involves a cost risk.

[0009]

[Means for Solving the Problems]

 The vent cap according to the present invention comprises a hood body composed of a spherically-shaped head portion and a cylindrically-shaped skirt portion, and each hood body serves as a separate member. It is formed by connecting the molded head and skirt.

As a result of using the head and the skirt as separate members in this way, the cylindrical skirt can be formed by simple processing such as roll processing, and press molding is required for the spherical head. Since it is only a part, it is possible to avoid increasing the size of the intermediate body. Therefore, it is not necessary to use a large press die which involves a cost risk.

Particularly, since the press die used for forming the vent cap hood body using the spherical hood body which is most frequently used in the present vent cap market can be used as it is, it is very cost effective. Also, there is a big merit in that it is easy to deal with size changes.

Although various forms of connection between the head member and the skirt member are possible, a step portion having a step width corresponding to the thickness of the skirt member is formed at the lower end of the head member. If the skirt member is connected using the step portion, the connecting portion becomes flat, which is more preferable in appearance.

[0013]

【Example】

 An embodiment of this invention will be described below. As shown in FIG. 1, the vent cap 1 according to this embodiment includes a main body 2 and a hood body 3.

The main body 2 is a fitting cylinder 4 for fitting and mounting in a ventilation duct opening on the wall surface, and a base plate which is connected to the tip of the fitting cylinder 4 and serves as a connection base for the hood body 3. 5, and the inside of the fitting cylinder 4 serves as a ventilation path for supply / exhaust.

The hood body 3 is formed in a shape such that a bell is halved, that is, a head 6 having a spherical shape obtained by dividing a spherical body into four and a skirt portion 7 having a semi-cylindrical shape are continuous. The head member 6p and the skirt member 7p, which are separately molded, are connected to each other.

The head member 6p is obtained by dividing a hemispherical intermediate body M ₃ as shown in FIG. 4 into two, and this intermediate body M ₃ is formed by press molding using a corresponding press die. To be On the other hand, the skirt member 7p is formed by rolling a material plate into a semi-cylindrical shape, for example, by roll forming.

As shown in FIGS. 2 and 3, the two members 6p and 7p are connected by matching the upper end of the skirt member 7p with the step portion 8 formed at the lower end of the head member 6p. It is made by welding, and the connecting portion is made flat by adjusting the step width w of the step portion 8 to the thickness t of the skirt member 7p.

[0019]

[Effect of device]

 As described above, the vent cap according to the present invention is required in the manufacturing process of the hood body because the hood body is formed by connecting the head member and the skirt member that are separately formed. The size of the intermediate body can be reduced to almost half, and it has the effect that it is easy to handle large sizes for large-diameter ventilation ducts. It has a great effect in that it is easy to deal with size changes and cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a vent cap according to the present invention.

FIG. 2 is a sectional view taken along the arrow SA-SA in FIG.

FIG. 3 is an enlarged cross-sectional view of a connecting portion between a head member and a skirt member.

FIG. 4 is a perspective view of an intermediate body in manufacturing the hood body.

FIG. 5 is a perspective view of a hood body of a conventional vent cap.

FIG. 6 is a perspective view of an intermediate body in manufacturing a conventional hood body.

[Explanation of symbols]

 1 Vent cap 3 Hood body 6 Head 6p Head member 7 Skirt 7p Skirt member 8 Step w w Step width

Claims (2)

[Scope of utility model registration request] 1. A vent cap having a hood body having a spherical head portion and a cylindrical skirt portion, wherein the head portion and the skirt portion formed as separate members are connected to each other. A vent cap for a large diameter duct, which is characterized by forming a hood body. 2. The large diameter according to claim 1, wherein a step portion having a step width corresponding to the thickness of the skirt member is formed at the lower end of the head member, and both members are connected via the step portion. Vent cap for duct.