JP2002327884A - Connection metal fitting for pipes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection metal fitting for pipes capable of expanding an application range by a constitution without staying fluid after connection metal fitting main bodies can be connected, attached and detached each other in a single operation and a sealing property is secured in the connection state. SOLUTION: A fitting projecting part 5 and a fitting recessed part 6 are formed on the connection metal fitting main body 1. A sealing member 4 made of an elastic material is mounted on a front end face. On end face and an outside diameter surface of the sealing member 4 are fitted into a bottom surface and a peripheral surface of a recessed part 5 for mounting provided on the front end face of the connection metal fitting main body 1 and the other end face is projected from the front end face of the connection metal fitting main body 1. The projecting end face is inclined and formed so that projecting amount may be larger on the inside diameter side as compared with the outside diameter side. The one end face of the sealing member 4 and the bottom surface of the recessed part 5 for mounting are inclined and formed each other so that the projecting amount may be smaller on the inside diameter side as compared with the outside diameter side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fitting for pipes composed of a pair of fittings having the same structure without distinction between males and females.
The present invention relates to an improvement in a seal structure for sealing between coupling metal bodies.

[0002]

2. Description of the Related Art A plug-in type hose is known as a fitting for a fire hose, for example, in which a pair of connecting fittings to be joined has a distinction between male and female, and male fittings or female fittings. No mutual connection.

[0003] In particular, there are two types of metal fittings, male and female, which are inconvenient in handling and are used in places where quickness and certainty are required, such as fire extinguishing work. Must be manufactured, and the manufacturing cost is high.

[0004] In order to solve such a problem, a hose connecting fitting having a pair of connecting fitting bodies of the same shape without gender difference has been developed. For example, there is Japanese Patent Application No. 7-275835 filed by the present applicant, which has already been registered as a patent (Japanese Patent No. 3107507).

[0005] Recently, a hose fitting has been used, for example, in connection with a food plant (so-called sanitary).
There is a great demand for diversion to the connection of the pipes that make up the product and the connection of the pipes that make up the production line for pharmaceuticals or cosmetics.

[0006] That is, there is an advantage that the connection and disconnection of the connection metal fittings can be performed with one touch, so that a great improvement in workability can be obtained, and that disassembly (separation) can be easily performed if necessary.

[0007]

The problem here is that the fluid introduced into the pipe always flows smoothly in the fitting body. That is, the fluid must be completely fresh, and there must not be any part that accumulates even a little.

[0008] Japanese Patent Application No. 7-27584 shown in FIG.
In No. 5, in addition to the sealing member b attached to the front end face of the cylindrical sealing surface member a being in a state of being in close contact with each other when the coupling metal members S are connected to each other, the sealing member b is sealed.
A concave space d is formed between the seal member b and the end face of the seal face member a.

Naturally, the fluid guided in the pipe has a fluid pressure and flows smoothly, but the fluid once entering the recessed space d is difficult to exit therefrom. That is, the concave space d becomes a reservoir for the fluid.

FIG. 10 (B) shows a modification in which the sealing member b1 is prevented from slipping out of the sealing surface member a1 in the axial direction. The presence of the concave space d at the base end of b1 remains unchanged, and this becomes a pool of fluid.

The utility model registration No. 306 shown in FIG.
No. 4938 is characterized by a form of a seal packing b2 which presses and seals a joint surface between joint pipes S1 of a water supply hose when they are joined together.
A concave space d is formed between the joint tube S1 and the joint tube S1, and the fluid easily penetrates into a reservoir portion.

That is, any of the seal packings b, b
Even in the case of 1, b2, since it is formed in a so-called tongue-like shape and protrudes from the mounting portion, it is inevitable that a concave space is formed between the non-close side and the mounting portion in a sealed state in which they are in close contact with each other. .

[0013] For this reason, it is a connection fitting which can be connected and detached with one touch, and is excellent in connection and detachment workability and secures the sealing property between the connection fitting main bodies.
There is a problem that the application range is regulated by the generation of the fluid reservoir.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to make it possible to connect and remove the connecting metal fittings with one touch with one touch, and to secure the sealing property in the connected state, and to prevent the fluid from flowing. With a configuration that does not collect at all,
It is an object of the present invention to provide a fitting for piping that can always obtain fresh fluid and expand the range of application.

[0015]

According to a first aspect of the present invention, there is provided a pipe fitting of the present invention, in which a pair of connecting metal bodies are integrally connected to a pipe end or a pipe element. A plurality of fitting protrusions protruding in the axial direction at predetermined intervals along the peripheral end of the metal fitting body are provided, a fitting recess is formed between these fitting protrusions, and a fitting recess is formed. A locking hook that protrudes in the circumferential direction is provided on one side surface, and a biasing mechanism that biases the elastic force in the circumferential direction is provided on the other side surface,
A seal member made of an elastic material is attached to the front end surface of the coupling body, and the coupling bodies are detachably coupled with each other by the engagement of the locking hooks between the coupling bodies and the elastic urging force of the urging mechanism. In this connection fitting for pipes, the seal members contact each other to maintain the seal by this connection,
The seal member is attached to a mounting recess provided on the front end surface of the coupling body, and has a ring shape having a predetermined inner diameter and an outer diameter. One end surface and the outer diameter surface are the bottom surface and the peripheral surface of the mounting recess. And the other end surface protrudes from the front end face of the fitting body to form a tight seal with a seal member attached to the other fitting body, and the protruding end face is such that the amount of protrusion is larger on the inner diameter side than on the outer diameter side. The one end surface of the seal member and the bottom surface of the mounting recess of the fitting body are formed so as to be inclined so that the protrusion amount is smaller on the inner diameter side than on the outer diameter side.

The material of the seal member is not limited to an elastic material such as rubber, and any material that can be elastically deformed, such as Teflon (registered trademark) or metal, does not cause any problem.

According to a second aspect of the present invention, in the pipe fitting of the first aspect, the outer peripheral surface of the seal member and the outer peripheral surface of the mounting recess engaging with the outer peripheral surface of the seal member are provided with the mounting concave portion of the seal member. A locking projection and a locking recess for preventing the shaft from coming off in the axial direction are provided.

According to a third aspect of the present invention, in the fitting for connecting pipes according to the first aspect, the seal member is provided integrally with a negative pressure seal portion that seals tightly with each other when the inside of the pipe is in a negative pressure state. Features.

According to a fourth aspect of the present invention, in the fitting for pipes according to the first aspect, the bottom of the mounting recess and the one end face of the seal member are restricted from moving in the radial direction of the seal member when the inside of the pipe is in a negative pressure state. A movement restricting projection and a movement restricting recess.

According to the first aspect of the present invention, by adopting the means for solving the above-mentioned problem, the sealing members are secured in a one-touch connection state with each other, and the structure is such that fluid does not accumulate. The fluid is always circulated in a fresh state.

According to the second aspect of the present invention, the sealability is ensured in a state where the one-touch coupling metal fittings are connected to each other, so that the fluid does not accumulate, and further, in the axial direction from the mounting concave portion of the seal member. To prevent slipping out.

According to the third aspect of the present invention, the sealing performance is ensured in a state in which the connecting fitting bodies are connected to each other in a one-touch manner, the fluid does not accumulate, and further, a negative pressure is applied when the inside of the pipe is washed. Also, the sealing performance is not impaired.

According to the fourth aspect of the present invention, the sealing performance is ensured in a state in which the connecting fitting bodies are connected to each other by one-touch, the fluid does not accumulate, and further, a negative pressure is applied when cleaning the inside of the pipe. Also, the movement of the seal member in the inner diameter direction is reliably restricted.

[0024]

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

FIG. 1 shows a separate fitting.
This joint is composed of a pair of joint main bodies 1 and 1 having the same structure without male and female. Each of the fitting main bodies 1 is connected and fixed to an end of the pipe 2 by an appropriate means such as brazing.

The connecting fitting body 1 is formed of a substantially cylindrical body, the outer diameter of which is formed in a tapered shape whose diameter increases from the connecting portion of the pipe 2 to the tip thereof, and the inner diameter of which is the inner diameter of the connecting pipe 2. And are formed substantially identically.

A cylindrical sealing surface cylindrical body 3 is screwed from the distal end of the inner diameter of the coupling body 1. Then, a sealing member 4 made of an elastic material such as rubber packing is attached and fixed to the front end surface of the sealing surface cylindrical body 3 as described later.

The distal end of the coupling metal body 1 surrounds a sealing surface cylindrical body 3, in which a plurality of fitting projections 5 projecting in the axial direction at predetermined intervals in the circumferential direction are integrally formed. Provided. The space between the fitting projections 5 is called a fitting recess 6.

When the connecting metal members 1 are axially connected to each other, the fitting projection 5 of one connecting metal member 1 is inserted into the fitting recess 6 of the other connecting metal member 1, and the other one of the connecting metal members 1 is inserted into the fitting concave portion 6. The fitting projections 5 of the other fitting body 1 are inserted into the fitting recesses 6 of the fitting body 1 so as to be complementarily inserted into each other.

The width of the fitting recess 6 is formed wider than the width of the fitting projection 5. There will be gaps between them.

A locking hook 7 projecting in the circumferential direction is integrally provided on one side surface 5a of the fitting projection 5. Therefore, when the locking hooks 7 projecting from the fitting projections 5 are engaged with each other, the coupling metal bodies 1 are axially coupled to each other.

The locking surface of the locking hook 7 is inclined by a predetermined angle with respect to the circumferential direction so as to overhang.
When a load is applied in a direction in which the coupling metal bodies 1 are separated from each other due to fluid pressure or the like in a state where they are engaged, the locking hooks 7 are more strongly engaged with each other, so that the coupling metal bodies 1 can be securely removed from each other. It is configured to prevent.

Further, a gap exists between the distal end surface of the fitting projection 5 and the inner wall surface of the fitting recess 6 in a state where the locking hooks 7 are engaged with each other. Therefore, from the state in which the locking hooks 7 are engaged with each other, the fitting protrusion 5 and the fitting recess 6 can move so as to further enter each other in the axial direction.

The fitting projection 5 not provided with the locking hook 7
The other side surface 5b is inclined with respect to the axial direction of the fitting body 1. That is, the fitting protrusion 5 is formed in a tapered shape in which the width in the circumferential direction becomes narrower from the base end corresponding to the bottom of the fitting recess 6 to the tip thereof, and the side surface 5b is fitted with the fitting protrusion 5. It forms a guide surface when inserted into the recess 6.

An urging mechanism 8 is provided on each of the tapered side surfaces 5b. As shown in an enlarged view in FIG. 2, the urging mechanism 8 includes a steel ball 10 as an urging member housed in a cylindrical case member 9 so as to be freely protruded and retracted. And a spring 11 that elastically presses and biases in a direction protruding from the side surface 5b.

As shown in the drawing, when the fitting projection 5 is fitted into the mating recess 6 on the other side, the urging mechanisms 8 face each other, and the steel balls 10 abut against each other and press. meet. as a result,
The side surfaces 5b of the fitting protrusion 5 where the urging mechanism 8 is provided are separated from each other, and are pressed and urged so that the opposite side surfaces 5a are in close contact with each other.

Since the locking hooks 7 are provided on these side surfaces 5a, the locking hooks 7, 7 are more firmly engaged with each other by the action of the urging mechanisms 8, 8, and the impacts, etc. Causes no problems.

In order to connect the thus-constructed fitting main bodies 1 and 1 to each other, the fitting recess 5 of the other fitting main body 1 is oriented correctly with respect to the fitting projection 5 of one fitting main body 1. Let it be. Inevitably, the fitting projection 5 of the other fitting body 1 faces the fitting recess 6 of one fitting body 1.

It is only necessary to move at least one of the coupling metal members 1 in the axial direction while maintaining the posture. In a state where the fitting projection 5 is inserted into the fitting recess 6 of the coupling metal fittings 1 and 1 and the steel balls 10 and 10 of the urging mechanism 8 are in rolling contact with each other, the locking hooks 7 and 7 engage each other.

The connection fitting bodies 1 and 1 are connected to each other, so that the pipes 2 and 2 are connected to each other. At the same time, the sealing members 4 and 4 are in close contact with each other, as described later, and the sealing performance with respect to the coupling metal bodies 1 and 1 and the pipes 2 and 2 is ensured.

When the pipe 2 is to be disassembled (separated) as necessary, one of the coupling metal bodies 1 may be urged to rotate in the circumferential direction. The rotation urging direction at this time is the urging mechanism 8
Is a direction in which the side surfaces 5b and 5b provided with each other are in close contact with each other.

That is, the coupling body 1 is rotated against the urging force of the urging mechanism 8, and the side surfaces 5b and 5
When the b is close to each other, the locking hooks 7, 7 which have been in the engaged state are separated from each other. The connection state of the coupling metal bodies 1 and 1 is released, and the coupling metal bodies are free from each other and can be disassembled.

Although the pipe 2 is connected to the fitting body 1 here, a pipe connecting device such as a valve or a hose may be used instead of the pipe. The fitting body 1 may be connected to the main body by fitting. It may be changed so that it is constituted by a part.

That is, the pipe 2 is connected to one end of the main body, and the sealing surface cylindrical body 3 is attached to the other end, and the fitting portion has a fitting projection 5, a fitting recess 6, a locking hook 7, and the like. The biasing mechanism 8 and the like are formed. As a result, when connecting and disassembling (separating) the connection metal fittings 1 and 1, the operation on the fitting portion is sufficient.
The fitting portion can be easily handled to improve workability.

Regardless of the configuration of the engagement fitting main body 1 of any structure, the seal surface cylindrical body 3 and the seal member 4 attached to the seal surface cylindrical body 3 are as shown in FIG. The details will be described below.

FIG. 3 shows the seal face cylindrical body 3A of the first embodiment and a seal member 4A attached to the seal face cylindrical body 3A.

A mounting recess 15 is provided in the front end surface of the sealing surface cylindrical body 3A in the circumferential direction, and the sealing member 4A is mounted in the mounting recess 15. The mounting recess 15 is formed on the bottom surface 1 that is formed obliquely in a direction that gradually protrudes from the inner diameter side to the outer diameter side of the sealing surface cylindrical body 3A.
5a and a peripheral surface 15 parallel to the axial direction of the sealing surface cylindrical body 3A.
b. The inclination angle of the bottom surface 15a is set to, for example, 15 degrees.

Further, at the front end of the peripheral surface 15b of the mounting concave portion 15, a locking projection 15c projecting in the inner diameter direction is integrally provided. The locking projections 15c may be provided over the entire peripheral surface, or may be provided at predetermined intervals in the circumferential direction.

The seal member 4A has a ring shape having a predetermined thickness, an inner diameter and an outer diameter. The inner diameter is formed to be the same as the inner diameter of the sealing surface cylindrical body 3A, and the outer diameter is substantially the same as the diameter of the peripheral surface 15b of the mounting recess 15. For more information,
The seal member 4A is made larger by about 5%, and is shrunk and attached to make it difficult to come off.

The one end face 4a of the seal member 4A forms an inclined surface that gradually projects from the inner diameter side to the outer diameter side, and the inclination angle is the same as the inclination angle of the mounting recess bottom surface 15a. The peripheral surface of the seal member 4A is parallel to the axial direction, and a locking recess 16 is formed at the front end of the outer diameter so as to be recessed in the inner diameter direction.

The locking recess 16 is formed so as to correspond to the size and shape of the locking projection 15c provided in the mounting recess 15, so that the sealing member 4A can be attached to the mounting recess 15 of the sealing surface cylindrical body 3A. Fit into.

In addition, the locking projection 1 of the sealing surface cylindrical body 3A
Since the locking recess 16 of the seal member 4A is locked to 5c, the seal member 4A is prevented from coming off the seal face cylindrical body 3A in the axial direction.

With the sealing member 4A attached to the sealing surface cylinder 3A, one end surface 4b of the sealing member 4A protrudes from the front end surface of the sealing surface cylinder 3A. To be more specific, the projecting end surface 4b of the seal member 4A is formed so as to be inclined such that the amount of protrusion is greater on the inner diameter side than on the outer diameter side.

The inclination angle formed on the protruding end surface 4b of the seal member 4A is substantially the same as the inclination angle formed on the one end surface 4a of the seal member 4A and the bottom surface 15a of the mounting recess 15; Is set.

After all, the thickest portion of the seal member 4A is on the inner diameter side, and the thinner portion is on the outer diameter side,
Both end surfaces are formed as inclined surfaces having a downward slope from the inner diameter side to the outer diameter side.

FIG. 3 (A) shows a state in which the coupling metal bodies 1 face each other, and the sealing members 4A attached to the sealing surface cylinders 3A face each other. That is,
Before the joining metal fittings 1 are joined to each other.

FIG. 3 (B) shows that one of the metal fittings 1 is moved in the axial direction and the metal fittings 1 are connected to each other, whereby the sealing members 4A are elastically deformed and come into close contact with each other to achieve a sealing property. Is shown.

From the setting of the inclination angle at the protruding end surface 4b of the sealing member 4A, even if the sealing members 4A abut against each other, the outer peripheral edges of the protruding end surfaces 4b do not adhere to each other and remain.
In addition, the front end surfaces of the sealing surface cylindrical bodies 3A are at a predetermined interval.

At this time, no fluid flows between the pipe 2 and the joint fitting main body 1, and the inside is in a non-pressurized state. Further, since the sealing member 4A is made of an elastic material, the entire volume does not change at all before and after the coupling. for that reason,
The outer diameter side of the seal member 4A protrudes from the inclined surface 4b before coupling to form an R-shaped cross section, and the inner diameter side elastically deforms so as to protrude in the central axis direction.

FIG. 3 (C) shows a state where a fluid is actually circulated in the pipe 2 and the fitting body 1, and a predetermined pressure is applied inside. The inner diameter surface of the seal member 4A is pressed to the outer diameter side by receiving the fluid pressure, and the outer diameter side peripheral edge protrudes outward accordingly.

If the joining members 1 are joined to each other so that the sealing members 4A are in close contact with each other, the sealing properties between the sealing members 4A are ensured. On the other hand, since no concave space is formed between the sealing member 4A and the sealing surface cylindrical body 3A,
There is no accumulation of fluid, and fresh fluid is always obtained by flowing smoothly.

FIG. 4 shows a sealing surface cylinder 3B of the second embodiment and a sealing member 4B attached to the sealing surface cylinder 3B.

The same parts as those in the first embodiment are denoted by the same reference numerals, and the locking projection 15 provided on the sealing surface cylinder 3B and the locking recess 1 provided on the sealing member 4B
6 is formed inside the protruding end surface 4b of the seal member 4B. That is, the outer peripheral edge of the sealing member 4B covers the front end surface of the sealing surface cylindrical body 3B,
The front end face of the sealing face cylindrical body 3B is not exposed at all.

In FIGS. 4A to 4C, the operation is almost the same as that in FIGS. 3A to 3C. 4C, in which a predetermined pressure is applied to the inside while the fluid shown in FIG. 4C is circulated, the inner peripheral surface of the seal member 4B receives the fluid pressure and is pressed to the outer diameter side. That is, the outer diameter side peripheral edge protrudes outward from the sealing surface cylindrical body 3B.

If the sealing members 4B are brought into close contact with each other by connecting the fitting bodies 1 to each other, the sealing performance is ensured, but no concave space is formed between the sealing member 4B and the sealing surface cylindrical body 3B. As a result, the fluid does not accumulate, and the fluid flows smoothly and a fresh fluid is always obtained.

FIG. 5 shows a seal face cylindrical body 3C of the third embodiment and a seal member 4C attached to the seal face cylindrical body 3C.

The same parts as those in the first embodiment are denoted by the same reference numerals. The feature here is that, for example, when the inside of the pipe 2 is steam-cleaned and the pipe cools down and the water vapor condenses, the pipe 2 In addition, since a negative pressure is applied to the inside of the fitting body 1, a seal structure capable of coping with not only a positive pressure but also a negative pressure is provided.

That is, although the mounting concave portion 15 is provided on the front end surface of the sealing surface cylindrical body 3C, and the sealing member 4C is mounted in the mounting concave portion 15, the outer diameter of the sealing end member 4C at the protruding end surface 4b remains unchanged. The difference is that the negative pressure seal portion 17A is provided integrally along the side peripheral end portion.

The negative pressure seal portion 17A is provided with a protruding end face 4b.
In contrast to the inclination from the inner diameter side to the outer diameter side, the inclination is such that the projection amount increases from the inner diameter side to the outer diameter side, and the entire negative pressure seal portion 17A is provided at the front end of the sealing surface cylindrical body 3C. It rests on the locking projection 15c.

FIG. 5 (A) shows a state in which the joint fitting bodies 1 face each other, and the sealing members 4C attached to the sealing surface cylinders 3C face each other. That is,
Before the joining metal fittings 1 are joined to each other.

In FIG. 5B, the connecting metal members 1 are connected to each other, and the protruding end surfaces 4b of the sealing member 4C are brought into close contact with each other. A non-pressure state where fluid is not circulated, although the sealing property is ensured. The negative pressure seal portions 17A are also close to each other to some extent, and a substantially rhombus-shaped space is formed between the negative pressure seal portions 17A and the seal inclined surface 4b on the inner diameter side.

When a fluid is caused to flow through the pipe 2 and the fitting body 1, although not shown, the inner peripheral surface is pressed to the outer diameter side by applying a positive pressure to the seal member 4C, and the outer diameter side is correspondingly pressed. The periphery protrudes outward.

Although the diamond-shaped space beside the negative pressure seal portion 17A is deformed, it is undeniable that it remains as a space. However, no fluid is introduced here and the sealing member 4C
While the sealing performance is ensured by the above, since the concave space is not formed and there is no liquid pool, the fluid smoothly flows through the inside of the fitting body 1.

FIG. 5C shows a state in which, for example, the inside of the pipe 2 is subjected to steam cleaning, and a state in which a negative pressure is applied to the inside of the pipe 2 and the joint fitting body 1. When a negative pressure is applied to the inside of the pipe, a load is applied in a direction in which the joint fitting bodies 1 are pressed against each other. With the locking hooks 7 engaged with each other, the fitting projection 5
Since there is a gap between the distal end surface and the inner wall surface of the fitting recess 6, the fitting protrusion 5 and the fitting recess 6 are further moved in the axial direction by this load.

That is, the negative pressure seal portions 17A integrally provided on the outer diameter side of the seal member 4C are elastically deformed by receiving the compressive force in the axial direction because they move so as to press the cylindrical surfaces 3C of each other. , The length of close contact with each other is longer, and the sealing force is increased.

Further, considering the case where the inside of the pipe is evacuated, the negative pressure seal portion 17A has a pressure of about 0.1 MPa due to the atmospheric pressure.
The pressure a is applied, and the negative pressure seal portion 17A is pressed toward the inner diameter side.

At this time, at the tip of the locking projection 15c provided over the entire peripheral surface of the front end of the sealing surface cylinder 3C to which the negative pressure sealing portion 17A is attached, the sealing surface cylinder 3C is provided.
There is provided a negative pressure seal receiving surface 15d which is formed obliquely in a direction gradually protruding from the outer diameter side to the inner diameter side of C. The inclination angle of the negative pressure seal receiving surface 15d is set to, for example, 20 degrees.

On the other hand, the inclination angle formed on the negative pressure seal portion 17A provided on the outer diameter side of the seal member 4C is preferably slightly larger than the inclination angle formed on the protruding end face 4b. Is set.

Here, the sealing mechanism under a negative pressure will be described with reference to FIG. Two negative pressure seal portions 1 closely sandwiched between opposed negative pressure seal receiving surfaces 15d.
When 7A is viewed integrally, its cross-sectional shape is a wedge shape facing the inner diameter side of the sealing surface cylindrical body 3C.

A pressure of about 0.1 MPa due to the atmospheric pressure is applied to the negative pressure seal 17A.
Is pressed to the inner diameter side, so that it is as if a wedge is driven in, and exhibits a sealing effect.

This mechanism is the same even when receiving an internal pressure. When the two sealing members 4 sandwiched and closely contacted by the bottom surface 15a of the mounting concave portion 15 shown in FIG. 3 are integrally viewed, the cross-sectional shape is a wedge shape facing the outer diameter side of the sealing surface cylindrical body 3A. .

Since a large pressure due to the internal pressure is applied to the seal member 4 and the seal member 4 is pressed to the outer diameter side, the sealing effect is exhibited as if a wedge is driven.

When the size of the internal pressure sealing member 4 and the size of the negative pressure sealing portion 17A are compared, the negative pressure sealing portion 17A is smaller than that of the fluid pressure reaching 3.0 MPa. Atmospheric pressure received in vacuum is about 0.1
This is because it is very small as MPa.

That is, if the joint members 1 are joined to each other so that the seal members 4C are brought into close contact with each other, the pipe 2 and the joint member 1 can be in a state where a positive pressure is applied or a negative pressure is applied. However, the sealability is ensured by the seal members 4C provided with the negative pressure seal portions 17A.

On the other hand, since no recessed space is formed between the seal member 4C and the coupling fitting main body 1, no fluid pool is generated, and the fluid flows smoothly and fresh fluid is always obtained.

FIG. 6 shows a seal face cylindrical body 3D of the fourth embodiment and a seal member 4D attached to the seal cylindrical body 3D.

The same parts as those in the first embodiment are denoted by the same reference numerals, and here, as in the third embodiment, the sealing member 4 which can handle not only positive pressure but also negative pressure.
D is provided.

As the negative pressure sealing portion 17B, the sealing member 4
A tongue-like member is integrally provided along the outer peripheral edge of the protruding end surface 4b of D. The tongue-shaped negative pressure sealing portion 17B is separated from the locking projection 15c at the front end of the sealing surface cylindrical body 3D.

From FIG. 6 (A) to FIG. 6 (C), the operation is almost the same as the operation from FIG. 5 (A) to FIG. 5 (C). In other words, in a state where a negative pressure is applied to the pipe 2 and the inside of the coupling fitting main body 1 shown in FIG. 6C, the negative pressure seal portions 17B are elastically deformed so that the close contact length between them becomes longer.

In this manner, the pipe 2 and the coupling fitting body 1
Not only when a positive pressure is applied, but also when a negative pressure is applied, the sealing performance is ensured, but no concave space is formed between the sealing member 4D and the sealing cylinder 3D.
No fluid accumulation occurs, and a fresh fluid is always obtained by flowing smoothly.

FIG. 7 shows a seal face cylindrical body 3E of the fifth embodiment and a seal member 4E attached to the seal face cylindrical body 3E.

The same portions as those in the first embodiment are denoted by the same reference numerals, and here, a feature is to limit the displacement of the seal member 4E in the inner diameter direction when a negative pressure is applied. ing.

That is, in the embodiment described above,
One end surface 4a and the peripheral surface of the sealing member 4 are fitted into the bottom surface 15a and the peripheral surface 15b of the mounting concave portion 15, and
5a and one end surface 4a are formed so as to be inclined such that the amount of protrusion on the inner diameter side is smaller than that on the outer diameter side.

When a positive pressure is applied to the sealing members 4 that are in close contact with each other, a pressure is applied in the outer radial direction. This direction is a direction that can be received by the inclined surface between the bottom surface 15a and the one end surface 4a. No problem.

However, when receiving a negative pressure, the seal member 4 receives a pressure moving toward the inner diameter side. This direction corresponds to the bottom 1
This is also a direction along the inclination of 5a and the one end surface 4a, and there is a possibility that the position of the seal member 4 described above is shifted in the inner diameter direction.

Therefore, a part of the bottom surface 15a of the mounting recess 15 provided in the sealing surface cylindrical body 3E and the sealing member 4
On one end surface 4a of E, a movement regulating projection 18a and a movement regulating recess 19a are provided.

To be more specific, basically, the one end face 4a of the seal member 4E and the bottom face 15a of the mounting recess 15 are formed so as to be inclined so that the amount of protrusion on the inner diameter side is smaller than the outer diameter side. However, in particular, during a predetermined distance from the inner diameter,
The projection is formed so that the amount of protrusion on the inner diameter side is larger than that on the outer diameter side.

Therefore, one end face 4 of the seal member 4E
a is provided with a projection 18a, which is referred to as a movement regulating projection. Also, the bottom surface 15a of the mounting recess 15
Is provided with a concave portion 19a which engages with the movement restricting projection 18a, which is referred to as a movement restricting concave portion.

FIG. 7 (A) shows a state in which the joint fitting bodies 1 face each other, and the sealing members 4E attached to the sealing surface cylinders 3E face each other. That is,
Before the joining metal fittings 1 are joined to each other.

FIG. 7B shows a non-pressure state in which the protruding end surfaces 4b of the seal members 4E are brought into close contact with each other to secure a seal and no fluid flows. While the sealing property of the sealing member 4E is ensured, the concave space is not formed, so that the fluid smoothly flows through the inside of the fitting body and does not stagnate, so that a fresh fluid is always obtained.

FIG. 7 (C) shows a state in which a negative pressure is applied to the inside of the pipe 2, the inner peripheral surfaces of the seal members 4E are pulled out in the center line direction and protrude, and the front end of the joint fitting body 1 is formed. The surfaces are closer together.

In this way, the pipe 2 and the coupling metal body 1
Not only when a positive pressure is applied to the inside, but also when a negative pressure is applied, the sealability between the seal members 4E is ensured, while the fluid smoothly flows through the inside of the fitting body 1.

In particular, the seal member 4E is urged to move in the inner diameter direction in a negative pressure state.
E is provided with a movement regulating projection 19a,
Are provided with regulating recesses 18a and are engaged with each other, so that the positional deviation of the seal member 4E in the inner diameter direction is reliably regulated.

FIG. 8 shows a seal face cylindrical body 3F of the sixth embodiment and a seal member 4F attached to the seal face cylindrical body 3F.

The same parts as those in the first embodiment are denoted by the same reference numerals. Here, similarly to the fifth embodiment, when the negative pressure is applied to the inner side of the seal member 4F. It is characterized in that displacement is regulated.

That is, the one end face 4a of the seal member 4F and the bottom face 15a of the mounting recess 15 have basically the same inclined shape as described above, and the movement regulating projection 18b and the movement regulating recess 19b are formed. Although provided, it has a curved shape from the inner diameter side to the outer diameter side. This shape
When the seal is removed for cleaning, it is characterized by its curved surface, which makes it easy to clean.

Accordingly, the operation from FIG. 8 (A) to FIG. 8 (C) is almost the same as the operation from FIG. 7 (A) to FIG. 7 (C) described above. That is, even when a positive pressure or a negative pressure is applied between the pipe 2 and the inside of the joint body 1, the fluid is smoothly circulated inside the joint body 1 while the sealing property is secured.

In particular, the seal member 4F is urged to move in the inner diameter direction in a negative pressure state.
The displacement in the inner diameter direction of the seal member 4F is reliably restricted by the and the movement restricting recess 19b.

FIG. 9 shows a seal face cylindrical body 3G according to the seventh embodiment and a seal member 4G attached to the seal face cylindrical body 3G.

The same parts as those in the first embodiment are denoted by the same reference numerals, and here, similarly to the fifth embodiment, when the negative pressure is applied to the inner side of the seal member 4G. It is characterized in that displacement is regulated.

That is, the one end face 4a of the sealing member 4G and the bottom face 15a of the mounting concave portion 15 are basically the same as the inclined shape described above, and are provided at the intermediate portion extending from the inner diameter side to the outer diameter side. 9A and 9B are provided with the movement restricting projection 18c and the movement restricting recess 19c.
7 (A) to FIG. 7 described above over (C).
It has almost the same operation as the operation over (C). That is, even when a positive pressure or a negative pressure is applied between the pipe 2 and the inside of the joint body 1, the fluid is smoothly circulated inside the joint body 1 while the sealing property is secured.

In particular, the seal member 4G is urged to move in the inner diameter direction in a negative pressure state.
The displacement of the seal member 4G in the inner diameter direction is reliably restricted by the movement restricting recess 19c.

[0113]

As described above, according to the present invention, the connecting metal members can be connected and detached by one-touch operation, so that the workability can be improved, and the sealing performance can be ensured in the connected state, and high reliability can be obtained. In addition, there is no room for a liquid pool to be generated in the fluid flowing inside the pipe, so that an effect that the application range is greatly expanded can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view and a cross-sectional view showing a pipe joint according to an embodiment of the present invention separately.

FIG. 2 is a partial cross-sectional view of the fitting body for explaining the urging mechanism of the embodiment.

FIG. 3 is a cross-sectional view illustrating a seal structure of a seal member according to the first embodiment.

FIG. 4 is a cross-sectional view illustrating a seal structure of a seal member according to a second embodiment.

FIG. 5 is a cross-sectional view illustrating a seal structure of a seal member according to a third embodiment.

FIG. 6 is a cross-sectional view illustrating a seal structure of a seal member according to a fourth embodiment.

FIG. 7 is a cross-sectional view illustrating a seal structure of a seal member according to a fifth embodiment.

FIG. 8 is a cross-sectional view illustrating a seal structure of a seal member according to a sixth embodiment.

FIG. 9 is a cross-sectional view illustrating a seal structure of a seal member according to a seventh embodiment.

FIG. 10 is a cross-sectional view illustrating a conventional sealing member and a sealing structure that are different from each other.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Connection metal fittings, 2 ... Piping, 5 ... Fitting protrusion, 6 ... Fitting concave part, 7 ... Locking hook part, 8 ... Urging mechanism, 4 ... Seal member, 5 ... Mounting concave part, 15c ... Stop projection, 16: locking concave portion, 17A: negative pressure seal portion, 18a: projection for regulating movement, 19a: concave portion for regulating movement.

Claims (4)

[Claims] 1. A plurality of fitting projections, wherein a pair of connecting metal bodies are integrally connected to a pipe end or a pipe element, and project axially at predetermined intervals along a peripheral end of each connecting metal body. A fitting recess is formed between the fitting protrusions, a locking hook projecting in the circumferential direction is provided on one side surface of the fitting protrusion, and the engaging hook portion is provided on the other side surface in the circumferential direction. An urging mechanism for urging an elastic force is provided, a seal member made of an elastic material is attached to a front end surface of the coupling metal body, engagement of the locking hooks in the coupling metal bodies,
A coupling fitting for piping that removably couples coupling fitting bodies with an elastic urging force of an urging mechanism, and the sealing members abut each other by this coupling to maintain a seal. The sealing member includes the coupling fitting body. The sealing member is formed in a ring shape having a predetermined inner diameter and an outer diameter, and one end surface and an outer diameter surface thereof are formed on the bottom surface and the peripheral surface of the mounting concave portion. The other end face is projected from the front end face of the fitting body to form a close seal with the seal member attached to the other fitting body, and the projecting end face of the seal member has a larger amount of protrusion on the inner diameter side than on the outer diameter side. The one end face of the seal member and the bottom face of the mounting recess of the coupling fitting body are formed so as to be inclined such that the protrusion amount is smaller on the inner diameter side than on the outer diameter side. Fittings for plumbing. 2. An outer peripheral surface of the seal member and a peripheral surface of a mounting recess engaging with the outer peripheral surface of the seal member. The fitting for pipes according to claim 1, wherein a locking recess is provided. 3. The fitting for piping according to claim 1, wherein said sealing member is integrally provided with a negative pressure seal portion for sealing tightly to each other when the inside of the pipe is in a negative pressure state. . 4. A movement restricting projection and a movement restricting recess on the bottom surface of the mounting recess and one end surface of the seal member for restricting the movement of the seal member in the inner diameter direction when the inside of the pipe is in a negative pressure state. The fitting for pipes according to claim 1, wherein the fitting is provided.