JPH0539558U - Pipe connection device - Google Patents

Abstract

(57) [Abstract] [Purpose] Two pipes are screwed together, and a ring-shaped packing material fitted in the screwed joints is axially tightened with a nut body to seal the screwed joints. In the device, the end surface of the pipe member for axially compressing the packing material in cooperation with the nut body is used as the packing receiving surface. [Structure] The packing material 8 is fitted into the male screw portion 22 of the other tube 2 screwed into the one tube 5, and the packing material 8 is housed in the recessed portion 72 of the nut body 7. The packing material 8 is tightened with the nut body 7 to be pressed against the end surface 53 of the one tube 5, and also pressed against the inner peripheral surface 74 of the recessed portion 72 and the male screw portion 22.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a splicer unwinding pipe used as fire extinguishing equipment and a pipe connecting device such as a trap used as drainage equipment.

[0002]

[Prior Art]

 In the unwinding piping of the sprinkler, the connection device described in Japanese Utility Model Laid-Open No. 3-19190 has been conventionally known. As shown in FIG. 4, this product is provided with a packing receiving surface 101 having an outwardly expanded taper shape at the end of an upstream tubular piping member 100, and the piping member 100 following the packing receiving surface 101. Has an internal threaded portion 102 formed on its inner peripheral surface, and a male threaded portion 201 formed on the outer peripheral surface of the downstream tubular piping member 200 is screwed into the female threaded portion 102 and fitted into the male threaded portion 201. The ring-shaped packing material 300 is tightened by the nut body 400 screwed to the male screw portion 201 to be in close contact with the packing receiving surface 101 and the end surface 401 of the nut body 400, and the inner peripheral portion of the packing material 300 is The male threaded portion 201 is closely fitted and meshed.

[0003]

[Problems to be solved by the device]

 In such a conventional connecting device, of the two tubular pipe members 100 and 200 which are screwed and connected to each other, the pipe member 100 on the side having the female screw portion 102 is expanded to have a special shape, that is, an outer expanding taper shape. It is necessary to form a packing receiving surface 101 having a different shape, and the packing receiving surface 101 having that shape cannot be formed as long as it is a tubular pipe member, and the packing receiving surface 101 having that shape is formed. It can be formed only for the piping members that are supposed to do so. For this reason, the conventional connecting device has the inconvenience that there are restrictions on the piping members to which it can be applied.

In view of the above circumstances, the present invention was made based on the idea that, of two tubular pipe members screwed together, the end face of the pipe member on the side having the internal thread portion is used as the packing receiving surface. It can be applied regardless of whether or not it is assumed in advance to form the above-described tapered taper receiving surface of the pipe member. It is an object of the present invention to provide a pipe connecting device capable of giving reliable water tightness to a connecting portion.

[0005]

[Means for Solving the Problems]

 The pipe connecting device according to the present invention includes two tubular pipe members connected to each other, a female thread portion formed on an inner peripheral surface of one end of the pipe member, and an outer peripheral surface of an end portion of the other pipe member. A male threaded portion that can be screwed into the female threaded portion, a nut body that is screwed into the male threaded portion, and an annular recessed portion that is formed on an inner peripheral side portion of the nut body that faces one end surface of the piping member. While being accommodated in the recessed portion of the nut body, it is pressed between the bottom surface of the recessed portion and the end surface of one of the pipe members, and is brought into contact with the male screw portion screwed into the female screw portion. And a ring-shaped packing material.

[0006]

[Action]

 According to this structure, when the male threaded portion is screwed into the female threaded portion to connect the two piping members, and the packing material housed in the recessed portion is tightened by the nut body screwed to the male threaded portion, the packing material is recessed into the recessed portion. The bottom surface of the pipe and the end surface of one of the piping members are pressed against these surfaces, and at the same time, the packing material bulges inward and outward in the radial direction to the inner peripheral surface of the male screw part or the recessed part. Pressure contact.

[0007]

【Example】

 FIG. 1 shows an unwinding pipe 1 for a sprinkler in which two S-shaped pipes 2 and 3 are connected in a longitudinal direction. The upper end of an upstream S-shaped pipe 2 is connected to a main pipe 4 through a branch joint 5. The reducer 6 is connected to the lower end of the S-shaped pipe 3 on the downstream side, and a sprinkler head (not shown) is attached to the reducer 6. The branch joint 5 and the upstream S-shaped pipe 2 are an example of a tubular pipe member which is a component of the present invention.

FIG. 2 is a partially enlarged sectional view showing a connection point A between the branch joint 5 and the upstream S-shaped pipe 2. As shown in this figure, one pipe member, that is, the branch joint 5, has a female screw portion 52 formed of a taper screw on the inner peripheral surface of the lower end portion 51 thereof. Further, the end face 53 of the branch joint 5 is in a state of being orthogonal to the axis, and in this embodiment, the portion including the end face 53 is made thicker than the other portions to widen the width of the end face 53. is there.

On the other piping member, that is, on the upstream side S-shaped pipe 2, a male screw portion 22 made of a taper screw is formed on the outer peripheral surface of the upper end portion 21, and this male screw portion 22 is a female thread of the branch joint 5. It is screwed into the threaded portion 52.

The nut body 7 is screwed into the male screw portion 22 of the S-shaped pipe 2. In this nut body 7, an annular recess 72 is formed in an inner peripheral portion of an end surface 71 facing the end surface 53 of the branch joint 5. The bottom surface 73 of the recess 72 is perpendicular to the axis, and the inner peripheral surface 74 is parallel to the axis. Furthermore, the inner diameter of the recess 72 is slightly shorter than the outer diameter of the end face 53 of the branch joint 5.

Reference numeral 8 denotes a ring-shaped packing material, which is accommodated in the recessed portion 72 of the nut body 7 and is screwed onto the male screw portion 22 of the S-shaped pipe 2.

When the nut body 7 is rotated in the direction of loosening with respect to the male screw portion 22 as shown by the arrow X in FIG. 2 and moved upward, the packing material 8 and the bottom surface 73 of the recessed portion 72 are moved as shown in FIG. It is pinched by the end face 53 of the branch joint 5 and compressed in the axial direction, and bulges inward and outward in the radial direction. Therefore, the packing material 8 is brought into pressure contact with the bottom surface 73, the end surface 53, the inner peripheral surface 74 of the recessed portion 72, and the male screw portion 22, and exhibits high sealing performance at the respective pressure contact portions. In this case, when the packing material 8 bulges inward and outward in the radial direction, the packing material 8 is radially expanded with the inner peripheral surface 74 of the recessed portion 72 limiting expansion outward. Since it swells inward, the packing material 8 is extremely strongly pressed against the male screw portion 22 and the inner peripheral surface 74 to exhibit high watertightness. In addition, at the pressure contact point between the packing material 8 and the male screw portion 22, the packing material 8 meshes with the ridges and valleys of the male screw portion 22 in a close contact state to increase the contact area, so that particularly high sealing performance is exhibited. It As shown in FIG. 3, when the packing material 8 is provided with the screw thread 81 and the screw thread 81 is screwed into the male screw portion 22, the pressure contact state between the packing material 8 and the male screw portion 22 becomes more dense. And higher sealing performance is achieved. Therefore, even if the high-pressure water for the sprinkler is supplied to the pipe, it is possible to reliably prevent the high-pressure water from leaking through the clearance between the male screw portion 22 and the female screw portion 52.

Although the female threaded portion 52 and the male threaded portion 22 are taper threads in the above-described embodiment, the female threaded portion 52 and the male threaded portion 22 may be parallel threads. However, in the unwinding piping for sprinkler, the height of the sprinkler head may be finely adjusted. To make such fine height adjustment, if the female screw portion 52 and the male screw portion 22 are tapered, the nut There is an advantage that it is not necessary to loosen the body 7 one by one, and even if fine adjustment is performed, the sealing property of the packing material 8 is not impaired. Further, in the embodiment, the connecting device adopted in the longitudinal part of the unwinding pipe for the sprinkler has been described, but it is of course possible to adopt a connecting device of the same configuration in the lateral part of the unwinding pipe. Further, the pipe connecting device according to the present invention can be applied to traps and other pipes with the same configuration.

[0014]

[Effect of the device]

 According to the pipe connecting device of the present invention, since the end face of one pipe member is used as the packing receiving surface, it is assumed in advance that the pipe receiving member has a taper receiving surface with a conventional outward spreading taper shape. Regardless of whether or not it is possible, the other pipe member having a male threaded portion can be connected in a watertight state. Regarding the degree of watertightness at the connection point, the packing material sandwiched between the bottom surface of the recess of the nut body and the end surface of one of the piping members is Since it bulges inward in the radial direction with the outward bulge being restricted, the packing material must be pressed firmly against the male threads of the other piping member and the inner peripheral surface of the recess. As a result, reliable watertightness is ensured, and high reliability is obtained regarding the sealing performance of the packing material.

[Brief description of drawings]

FIG. 1 is a front view of an unwinding pipe for a sprinkler that employs a pipe connecting device according to an embodiment of the present invention.

FIG. 2 is an enlarged partial cross-sectional view of part A (connection point) of FIG.

FIG. 3 is a partially enlarged sectional view of a packing material.

FIG. 4 is a partial cross-sectional view of a conventional example.

[Explanation of symbols]

 2 S-shaped pipe (other piping member) 5 Branch joint (one piping member) 7 Nut body 8 Packing material 21 S-shaped pipe end 22 Male screw part 51 Branch joint end 52 Female screw part 53 Branch joint end face 72 Recessed part 73 Bottom of recessed part

Claims (1)

[Scope of utility model registration request] 1. Two tubular pipe members connected to each other, a female screw portion formed on an inner peripheral surface of one end of the pipe member, and an outer peripheral surface of an end portion of the other pipe member, the female screw portion being formed. A male threaded portion that can be screwed in, a nut body screwed to the male threaded portion, an annular recessed portion formed on the inner peripheral side portion of the nut body facing the end surface of one of the piping members, and a nut body of the nut body. A ring-shaped packing material that is pressed between the bottom surface of the recessed portion and the end surface of one of the piping members and is in contact with the male threaded portion screwed into the female threaded portion while being accommodated in the recessed portion. And a pipe connecting device comprising: