JPH09280431A - Pipe connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealing between an outlet pipe and an inlet pipe by sufficiently securing the seal surface distance of seal members between the outlet pipe and the inlet pipe. SOLUTION: A holding member 5 is provided on one end 12a side of an inlet pipe 12 of a valve mechanism part, the outside diameter of a collar part 52 of the holding member 5 is approximately equal to the outside diameter D4 of an outlet pipe 11 of a water temperature adjusting part, and the outside diameter of a packing 7 to be arranged between the collar part 52 and one end 11a of the outlet pipe 11 is approximately equal to the outside diameter D4. Therefore, the area for holding the packing 7 can be increased in comparison with a pipe connecting structure in which the collar part 52 is not provided, moreover, the seal surface distance of the packing 7 can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connection structure using a cap nut.

[0002]

2. Description of the Related Art Conventionally, as a pipe connection structure, as shown in FIG. 3, a first pipe 12 and a second pipe 11 are connected to a cap nut 4.
There was a screw connection. On the inner peripheral portion of the cap nut 4, a retaining portion 41 that loosely fits into the one end 12a of the first pipe 12 and is retained, and the male screw 1 of the second pipe 11.
A female screw portion 42 that is screwed with 11 is formed. A seal packing 7 is provided between the first pipe 12 and the second pipe 11.

[0003]

By the way, since the inner diameter D1 of the retaining portion 41 is smaller than the inner diameter D2 of the female screw portion 42, the outside of the first pipe 12 into which the retaining portion 41 is loosely fitted. The diameter D3 is smaller than the outer diameter D4 of the second pipe 11 having the male screw 111 that is screwed into the female screw portion 42. The outer diameter of the packing 7 is almost the same as the outer diameter D4 of the second pipe 11, and the inner diameter of the packing 7 is the same as that of the second pipe 1.
It is smaller than the inner diameter of 1.

Therefore, in the packing 7, the second pipe 1
The radial distance (hereinafter referred to as the seal surface distance) t1 of the portion compressed between the first pipe 1 and the first pipe 12 becomes very small with respect to the radial width t0 of the packing 7, and a sufficient seal is obtained. You will not be able to get sex. Therefore, there arises a problem that the internal fluid leaks to the outside from between the second pipe 11 and the first pipe 12. Since the second pipe 11 is already installed in a house or the like, it is not considered to increase the wall thickness of the second pipe 11 inward in the radial direction to increase the sealing surface distance of the packing 7.

The present invention has been made in view of the above problems, and a sufficient sealing surface distance of the seal member between the first pipe and the second pipe is ensured so that the distance between the first pipe and the second pipe is large. The purpose is to improve the sealing property.

[0006]

In order to achieve the above object, in the invention described in claims 1 and 2, the first pipe (1
The holding member (5) is provided on one end (12a) side of 2), and the tubular portion (51) of the holding member (5) is inserted into the one end (12a) side of the first pipe (12). The collar-shaped part (52) of the holding member (5) is arranged on the one end (12a) side of the first pipe (12). And this collar-shaped part (5
The outer diameter of 2) is almost the same as the outer diameter (D4) of the second pipe (11), and the collar portion (52) and one end (1) of the second pipe (11).
The outer diameter of the first seal member (7) disposed between the first pipe member (1a) and the first seal member (1a) is substantially the same as the outer diameter (D4) of the second pipe (11).

According to this structure, the second pipe (1
The collar-shaped portion (52) having an outer diameter substantially the same as the outer diameter (D4) of 1) can increase the area for holding the first seal member (7). That is, in the first seal member (7), the seal surface distance is increased by the width (t2) between the outer peripheral surface of the second pipe (11) and the outer peripheral surface of the first pipe (12) as compared with the above-mentioned conventional technique. It can be enlarged and the sealing property between the second pipe (11) and the first pipe (12) can be improved.

The cylindrical portion (51) is connected to the first pipe (12).
The collar-shaped part (52) and the first seal member (7) are arranged between the first pipe (12) and the second pipe (11) in a state where they are inserted into and are tightened with a cap nut (4). The holding member (5) can be fixed to the one end (12a) side of the first pipe (12) by such a simple operation. Further, according to the invention described in claim 2, since the inner diameter of the holding member (5) is almost the same as the inner diameter of the main body (120), the passage of the fluid by providing the holding member (5) is provided. It is possible to prevent the reduction of the cross-sectional area and prevent the increase of the fluid flow resistance.

According to the third aspect of the invention, the second seal member (6) is arranged between the tubular portion (51) of the holding member (5) and the first pipe (12). Therefore, the fluid can be prevented from leaking between the tubular portion (51) and the first pipe (12).

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to a pipe connection structure in an automatic water supply system 1 shown in FIG. 2 will be described below. In FIG. 2, the automatic water supply device 1 automatically supplies water to the water outlet when the user's hand is placed on the water temperature adjusting unit 1a for adjusting the water temperature to the user's favorite and the water outlet not shown. And a valve mechanism section 1b for controlling the valve mechanism section 1b, and an electric control section 1c for controlling the drive of the valve mechanism section 1b. This water temperature adjusting unit 1a is already installed in the house, and the cold water from the existing water pipe 2 in the house and the existing hot water pipe in the house (not shown) arranged on the back side of the water pipe 2 in FIG. ) From hot water is supplied.

Then, the outlet pipe of the water temperature adjusting portion 1a (second
Piping) 11 and the inlet piping (first piping) 1 of the valve mechanism portion 1b
2 is connected by a cap nut 4 via a sealing packing (first sealing member) 7. Thereby, the cold water from the water pipe 2 and the hot water from the hot water pipe are
The water is supplied from the outlet pipe 11 of the water temperature adjusting unit 1a to the inlet pipe 12 of the valve mechanism unit 1b, and further supplied from the outlet pipe (not shown) of the valve mechanism unit 1b to the water outlet. The outlet pipe 11 of the water temperature adjusting unit 1a is conventionally formed of a metal material, and the inlet pipe 12 of the valve mechanism unit 1b is formed of a resin material in the present embodiment in order to reduce weight and cost. ing.

The connection structure between the outlet pipe 11 and the inlet pipe 12 will be described in detail below with reference to FIG. A male screw 111 is formed on the outer peripheral portion of the outlet pipe 11 on the one end 11a side. An annular groove 121 is formed in the outer peripheral portion of the inlet pipe 12 on the side of the one end 12a, and the annular groove 121 has
An annular metal retaining ring 3 is arranged. Further, a metal cap nut 4 is loosely fitted to the outer peripheral portion of the inlet pipe 12 on the side of the one end 12a, and the inner peripheral portion of the cap nut 4 is
A retaining portion 41 that comes into contact with the retaining ring 3 and a female screw portion 42 that engages with the male screw 111 of the outlet pipe 11 are provided.

Incidentally, the inner diameter D1 of the retaining portion 41 is smaller than the inner diameter D2 of the female screw portion 42. Therefore, the outer diameter D of the inlet pipe 12 in which the retaining portion 41 is loosely fitted
3 is smaller than the outer diameter D4 of the outlet pipe 11 having the male screw 111 screwed with the female screw portion 42. Further, a thin portion 122 is formed between the main body portion 120 of the inlet pipe 12 and the one end 12 a of the inlet pipe 12. As a result, the inner diameter of the inlet pipe 12 between the main body 120 and the one end 12a of the inlet pipe 12 becomes larger than that of the main body 120.

A holding member 5 made of a metal material is arranged on the end 12a side of the inlet pipe 12. The holding member 5 includes a cylindrical portion (cylindrical portion) 51 that is inserted into a thin portion (a portion referred to in the claims) 122 of the inlet pipe 12, and a collar-shaped portion 52 that extends radially outward from one end 51 a of the cylindrical portion 51.
It is composed of The collar portion 52 is in contact with the end surface of the inlet pipe 12 on the side of the one end 12a, and the outer diameter of the collar portion 52 is substantially the same as the outer diameter D4 of the outlet pipe 11.

The outer diameter of the cylindrical portion 51 is slightly smaller than the inner diameter of the thin portion 122 of the inlet pipe 12,
The inner diameter of is substantially the same as the inner diameter of the main body 120 of the inlet pipe 12. The inner diameter of the main body 120 of the inlet pipe 12 is smaller than the inner diameter of the outlet pipe 11. An annular groove 511 is formed on the outer peripheral portion of the cylindrical portion 51 of the holding member 5, and an annular O-ring (second seal member) 6 made of rubber is arranged in the annular groove 511. The O-ring 6 includes an annular groove portion 511 and a thin wall portion 12.
It is designed to be compressed between 2 and 3, and as a result, the cylindrical portion 51 of the holding member 5 and the inlet pipe 12 are sealed.

Further, an annular packing 7 made of rubber is provided between the outlet pipe 11 and the flange portion 52 of the holding member 5. The outer diameter of the packing 7 is almost the same as the outer diameter D4 of the outlet pipe 11, and the inner diameter of the packing 7 is the same as that of the outlet pipe 1.
It is smaller than the inner diameter of 1 and larger than the inner diameter of the holding member 5. Then, one end 1 of the inlet pipe 12
The cylindrical portion 51 of the holding member 5 is inserted into the 2a side, and the holding member 5
After the packing 7 is placed on the collar-shaped portion 52 of the above, the packing 7 and one end 11a of the outlet pipe 11 are brought into contact with each other, and then the male screw 111 of the outlet pipe 11 and the female screw portion 42 of the cap nut 4 are screwed together. By doing so, the outlet pipe 11 and the inlet pipe 12 are connected in a state where the packing 7 and the flange portion 52 of the holding member 5 are clamped and fixed between the outlet pipe 11 and the inlet pipe 12.

According to the above embodiment, in addition to the seal surface distance t1 in the prior art, the distance t between the outer peripheral surface of the outlet pipe 11 and the outer peripheral surface of the inlet pipe 12 in the packing 7 is increased.
The seal face distance can be increased by 2 minutes. Specifically, the sealing surface distance t1 is about 1.5 mm and the distance t2 is about 1.0 m.
m, and the sealing surface distance is about 1.0 m compared with the conventional technology.
m can be enlarged. Therefore, the sealing property between the outlet pipe 11 and the inlet pipe 12 can be improved.

Further, with the tubular portion 51 of the holding member 5 inserted in the thin portion 122 of the inlet pipe 12, the collar portion 52 of the holding member 5 and the packing 7, the inlet pipe 12 and the outlet pipe 1 are connected.
The holding member 5 can be attached to the one end 12a side of the inlet pipe 12 by a simple operation of disposing the holding member 5 and the cap nut 4 and tightening the cap nut 4. In addition, although the said embodiment applied the present invention to the piping connection structure in the automatic water supply apparatus 1, this invention is not limited to this and may be applied to various other piping connection structures. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pipe connection structure showing an embodiment of the present invention.

FIG. 2 is a schematic exploded view of an automatic water supply device provided with the pipe connection structure shown in FIG.

FIG. 3 is a sectional view of a pipe connection structure showing a conventional technique.

[Explanation of symbols]

11 ... Exit pipe (second pipe), 111 ... Male screw, 12 ...
Inlet pipe (first pipe), 4 ... Cap nut, 42 ... Female screw part, 5 ... Holding member, 51 ... Cylindrical part, 52 ... Collar part, 7 ...
Packing (first seal member).

Claims (3)

[Claims] 1. A first pipe (12) in which a cap nut (4) is loosely fitted and prevented from coming off at an outer peripheral portion on one end (12a) side, and the bag is provided on an outer peripheral portion on one end (11a) side. A second pipe (11) formed with a male screw (111) to be screwed with the female screw part (42) of the nut (4) and connected to the first pipe (12).
And a tubular part (51) inserted into one end (12a) side of the first pipe (12), and the one end (12a) side of the first pipe (12) in the tubular part (51). Edge (5
1a) and a holding member (5) integrally provided with a collar-shaped portion (52) extending radially outwardly, the outer diameter of the collar-shaped portion (52) of the holding member (5) being the second The outer diameter (D4) of the pipe (11) is substantially the same as the outer diameter (D4) of the second pipe (11), and the first seal member (7) has the same outer diameter as the second pipe (11). ) And the collar-shaped part (52) of the holding member (5), the first seal member (7) and the collar-shaped part (52) of the holding member (5) are First pipe (12) and the second
A pipe connection structure characterized in that it is fastened and fixed to the pipe (11) by the cap nut (4). 2. The inner diameter of the portion (122) of the first pipe (12) into which the holding member (5) is inserted is larger than the inner diameter of the main body (120) of the first pipe (12). The inner diameter of the cylindrical portion (51) of the holding member (5) is formed to be substantially the same as the inner diameter of the main body portion (120) of the first pipe (12). The pipe connection structure according to claim 1. 3. The tubular portion (5) of the holding member (5).
The pipe connection structure according to claim 1 or 2, wherein a second seal member (6) is arranged between 1) and the first pipe (12).