JPS6229744Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a nipple-type connecting cylindrical pipe for connecting ducts in air conditioning equipment construction, etc.

In the past, there have been many proposals for connection members for this type of duct connection, each with their own advantages and disadvantages, but in the field, after the two ducts to be connected are connected with these joining members, some kind of method is used to prevent them from coming apart. Since it was common practice to provide a connecting means, it was sometimes difficult to do so in narrow spaces.

The present invention eliminates such conventional disadvantages, uses a nipple-type cylindrical pipe as a connecting member, and completes the connecting means by simply inserting it into the connecting end of the duct to be connected. The purpose is to reduce the labor on site by omitting the joining process.
An annular recess 3, 3 is provided surrounding the outer surface of the intermediate portion of a metal cylindrical pipe 1 of an appropriate length, having a chevron-shaped cross section and opening outward at an annular communication portion 3a on both sides in the circumferential direction. , the outer peripheral edge 3b of the annular communication portion 3a is made thin and an elastic packing 2 is provided which is recessed inward toward the concave cavity 3, and the outer surface of both ends of the cylindrical tube 1 is surrounded and the tip is made thin. Elastic packings 4, 4 are provided in which a suitable number of projecting edges 5 each having a fin-like cross section are formed with their tip edges inclined toward the elastic packing 2 side.

Embodiments of the present invention will be described with reference to the drawings.

In the drawings, reference numeral 1 denotes a metal cylindrical tube of an appropriate length, and elastic packings 2, 4, 4 made of rubber or the like are provided surrounding the approximate center and both ends of the tube in the longitudinal direction.

The elastic packing 2 surrounding the central portion has a chevron-shaped cross section, and has annular communication portions 3a on both sides in the circumferential direction.
Annular recesses 3, 3 are provided which communicate with each other outwardly, and the outer peripheral edge 3b of the annular communicating portion 3a has a thin tip and is recessed inwardly toward the recess 3. I let it happen.

In the illustrated example, the annular recess 3 has a substantially circular cross section, but the shape is not limited thereto.

The elastic packings 4, 4 surrounding the outer surfaces of both ends are
One or more appropriate number of projecting edges 5 each having a fin-like cross section and having a thin tip end are provided so as to be inclined toward the elastic packing 2 side.

As shown in the drawing, the nipple-type connecting cylinder pipe configured as described above has one end of the cylinder pipe 1 inserted into one duct a to be connected, and the other end connected to the other duct b.
is inserted to connect both ducts a and b via the cylindrical pipe 1. During the insertion, the end edge of the duct is inserted into the recess 3 while wrapping the outer peripheral edge 3b from the communication portion 3a of the intermediate elastic packing 2. The elastic packings 4, 4 at both ends of the cylindrical pipe 1 are inserted into the ducts a, b while pressing the fin-shaped projecting edges 5, so that the ducts are inserted into the ducts a and b, respectively. Elastic packing 2, 4
The elasticity of the elastic packing 2 allows the sealing material to be firmly and tightly fitted, and if necessary, a sealing agent 6 may be filled into the recess 3 of the elastic packing 2 to further ensure the sealing of the internal fluid. There are cases.

In this way, according to the present invention, special elastic packings 2, 4, and 4 are attached to surround the longitudinal center and both ends of the cylindrical tube 1 of an appropriate length, and the nipple-type connecting cylindrical tube 1 is attached. Therefore, by simply inserting and intervening the cylindrical pipe 1 between the ducts to be connected, the ducts can be connected without using any connecting means to prevent subsequent extraction, simplifying the on-site operation, and requiring no special skill. Since it is simply inserted into the end of the duct without any need for it, it has the effect of allowing accurate connection with a simple number of steps.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a half-cutaway side view, and FIG. 2 is an enlarged sectional view of the main part showing the state of use. 1...tube, 2, 4...elastic packing, 3...
... Concave cavity, 3a... Communication portion of the concave cavity, 3b... Outer periphery, 5... Fin-like ridge.

Claims (1)

[Scope of utility model registration request] An annular recess 3, 3 is provided surrounding the outer surface of the intermediate portion of a metal cylindrical pipe 1 of an appropriate length, having a chevron-shaped cross section and opening outward at an annular communication portion 3a on both sides in the circumferential direction. , the outer peripheral edge 3b of the annular communication portion 3a is made thin and an elastic packing 2 is provided which is recessed inward toward the concave cavity 3, and the outer surface of both ends of the cylindrical tube 1 is surrounded and the tip is made thin. A nipple-type connecting cylindrical pipe for connecting ducts, which is provided with elastic packings 4, 4 formed by forming an appropriate number of fin-shaped projecting edges 5 with their tip edges inclined toward the elastic packing 2 side.