JPH0315907Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is applicable to piping of pressure fluid units of various industrial machines and vehicles, and allows easy connection of female and male fittings.
This invention relates to a pipe joint that can be quickly connected.

(Prior art) As pipe joints for pressure fluid utilization equipment, male and female members are connected by screwing (for example,
127185) and a plug-in method using a steel ball (for example, Japanese Patent Publication No. 59-32711) are generally known.

(Problem that the invention attempts to solve) By the way, the conventional screw-in type mentioned above has
Although it has the advantage of being simple in structure, easy to manufacture, and strong, it has the disadvantage of poor workability when joining, making it difficult to use especially in narrow spaces. A large number of tapered ball accommodation holes must be drilled in the surface, and the steel balls for coupling must be housed therein so that they can appear freely and not come off, which is difficult to process.
It requires a special machine, is expensive, and
These balls and the receiving groove on the male member side come into point contact, and the surface pressure stress of the pressure receiving part becomes excessive, making it easy to deform and having a short lifespan.

Therefore, this idea has a simple structure and is easy to manufacture.
To provide a pipe joint in which the female and male members can be easily and quickly connected, and the more internal pressure is applied, the stronger the connection between the female and male members is, and which can withstand long-term use.

(Means and effects for solving the problem) Based on the above-mentioned purpose, this invention has been developed as a pipe joint, which is a retaining cylinder of a female member consisting of a cylindrical body with one side serving as a connecting part and the other side serving as a holding cylinder. A ring cap is removably attached to the top of the tube, and has an extension extending from the end of the cylindrical portion toward the coupling side, and has a tapered surface on the inside of the extension. A short elastic cotter ring having a tapered surface whose outer surface coincides with the inner surface of the distal end of the inner tapered surface of the extension part is disposed so as to be movable in the radial direction and the axial direction, and the elastic cotter ring can be inserted into the female member. A male member consisting of a cylindrical body having a leading end part, a tapered surface, and an intermediate cylindrical part is fitted into an annular groove formed at a certain position in the intermediate cylindrical part, and the tapered surface of the cotter ring is fitted into the ring cap's taper. In addition, depending on the case, a retainer ring that can be expanded and contracted is arranged side by side on the connecting side of the cotter ring inside the extension part, and the annular shape of the male member is arranged together with the cotter ring. It is characterized by fitting into a groove.

When connecting the female and male members, if the leading barrel part of the male member is inserted through the open end of the ring cap of the female member, the cotter ring disposed inside the extension part of the ring cap will fit onto the leading barrel part. When the male member is inserted, the tapered surface of the male member pushes the cotter ring open, and when the annular groove is located inside the cotter ring, it contracts and fits into the groove, and in this state, the male member is inserted. When the female and male members are moved back slightly, the tapered surface of the cotter ring is pressed against the tapered surface of the ring cap, and the female and male members are joined together. and,
When an expandable and contractible retainer ring is arranged side by side on the coupling side of the retainer ring, the retainer ring slips out of the open end of the ring cap and locks onto the end face of the ring cap, thereby holding the male member in an immovable state.

(Example) The example will be explained with reference to the drawings.
In Fig. 1, A is a female member made of a stepped cylindrical body, which has a connecting part 1a with a thread on the outer periphery for attachment to an equipment manifold or piping, a large-diameter polygonal grip part 1b, and a ring cap 3. Consists of a medium-diameter holding cylinder part 1c for attachment, and a connecting part 1
A fluid passage hole 2a is provided inside the grip part 1.
A medium-diameter fitting hole 2 is formed from the inside of b to the center of the holding cylinder part 1c, into which the tip cylinder part of the male member B, which will be described later, is fitted.
b is formed, and a narrow fitting hole 2d with a large diameter approximately equal to the outer diameter of the intermediate straight cylinder part of the male member B is provided at the inner end of the holding cylinder part 1c, and this large diameter fitting hole 2d A tapered hole 2c that matches the tapered portion of the male member B is provided between the male member B and the medium diameter fitting hole 2b.

A ring cap 3 is placed on the holding cylinder portion 1c.
is screwed onto the ring cap 3, and this ring cap 3 has an extension portion 3a extending from the screw base to the connection side with the male member B.
A tapered surface 3b is formed inside the elongated portion 3a, and a tapered surface 3b is formed in the elongated portion so that the male member B can be inserted thereinto, as shown in FIG. 2A. The part is separated to form a C-shape, the width is about half the length of the extension part 3a, the outer peripheral surface has a tapered surface 4a that almost matches the front half of the inner tapered surface 3b of the extension part, and the inner diameter is a male member. An elastic cotter ring 4 with a trapezoidal cross section that almost matches the diameter of the annular groove provided in the intermediate straight cylinder part of B, and a thin expandable retainer whose outer diameter is almost equal to the outer diameter of the intermediate part of the cotter ring 4. The rings 5 are arranged in parallel so that they can move within a certain range in the radial and axial directions.

On the other hand, the male member B has a slender cylindrical body having a fluid passage hole 7 with a uniform diameter that is approximately equal to the fluid passage hole 2a of the female member A, and has a medium diameter fitting of the female member A at the connecting end. A leading cylinder part 6a with the length and diameter of the mating hole 2b approximately equal to each other and an O-ring 9 embedded therein, followed by a tapered surface 6b that matches the inner surface of the tapered hole 2c in the female member A, and a large-diameter mating hole. An intermediate cylindrical portion 6c having an outer diameter approximately equal to 2d is provided, and a distance l ₂ from the coupling side end face is located in the middle of the cylindrical portion 6c between the fluid passage hole 2a in the female member A and the medium diameter fitting hole 2b. At a position equal to the distance l ₁ from the boundary step to the end face of the retaining cylinder part 1c, there is a groove whose width is approximately equal to the sum of the width of the retainer ring 4 and the thickness of the retainer ring 5, and whose groove diameter is equal to the width of the retainer ring 4. An annular groove 8 is formed which is approximately equal to the inner diameter of the ring 4 and whose depth is smaller than the wall thickness of the cotter ring.

Further, a polygonal large-diameter grip portion 6d and a connection portion 6e such as a pipe having a thread formed on the outer periphery are provided on the non-coupled side of the intermediate straight cylinder portion 6c. However, there are cases in which a socket is mounted on the cylindrical body without providing a screw for this piping connection, and a hose is caulked between the cylindrical body and the socket. Furthermore, the O-ring 9 may be provided on the inner surface of the medium-diameter fitting hole 2b of the female member A, instead of being provided on the front cylinder portion 6a.

Therefore, when connecting the female and male members A and B, grasp the grip part 6d of the male member B and insert the leading tube part 6a from the open end of the ring cap 3 of the female member A toward the medium diameter fitting hole 2b. If you go, ring cap 3
The retainer ring 4 and the retainer ring 5 disposed in the extension part 3a of the male member B are fitted onto the front cylinder part 6a, and the retainer ring 5 and the elastic retainer ring 4 are inserted into the male member B by the subsequent insertion of the male member B. Tapered surface 6b
The male member B moves slightly in the radial direction so as to align with the axes of the female and male members,
When the tip of the female member A hits the boundary step of the medium-diameter fitting hole 2b as shown in Fig. 3A, the annular groove 8
is positioned inside the retainer ring 4 and the retainer ring 5, and the retainer ring 4 and the retainer ring 5, which have been expanded at the tapered surface 6b, fall into the annular groove 8 while contracting and engage with each other.

If the male member B is pulled back in this state as shown in FIG.
The taper outer surface 4a of the ring cap 3 is tightly pressed against the inner surface of the open end side of the taper surface 3a of the ring cap 3, and at the same time, the retainer ring 5 is contracted in diameter and the ring cap 3
The male member B is pulled out from the open end of the male member B and is engaged with the end face thereof, whereby the male member B is immovably coupled to the female member A.

During use, the tapered surface 4a of the cotter ring 4 is pressed against the tapered surface 3a of the ring cap 3 by the pressure fluid, creating a wedge effect to further strengthen the connection between the female and male members A and B.

On the other hand, in this coupled state, the ring cap 3
By unscrewing the from the holding cylinder part 1c of the female member A and pulling out the male member B from the medium diameter fitting hole 2b, the female,
When the male members A and B are separated, the ring cap 3, the retainer ring 4, and the retainer ring 5 are removed from the female member A together with the male member B.

Therefore, in the separated state, while reducing the diameter of the retainer ring 5 (state shown in Fig. 3A), the ring cap 3 is moved backward, and the retainer ring 4 and the retainer ring 5 are opened using a tool such as a screwdriver, and the annular groove 8 is opened. By removing the ring cap 3 from the male member B and assembling it again to the holding cylinder portion 1c of the female member A as shown in FIG. 1, it can be reused in a narrow space.

However, in modern industrial machinery and vehicles, once a large number of crowded pipes of a fluid unit are connected,
Normally, they are not attached or removed unless there is a malfunction, and the initial installation is the key.

Incidentally, as shown in FIG. 4A, the tipter ring 4 having the tapered outer surface 4a may be formed with thick portions at intervals in the circumferential direction instead of being thick all over the circumference. , Also, as shown in Figure B, the thick-walled star ring 4 is divided into a plurality of centers 4',
These may be grouped together using a ring spring 10 so as to be expandable and contractible.

Furthermore, if the retainer ring 5 is installed in parallel with the retainer ring 4, it is possible to reliably prevent the male member B from moving toward the female side during coupling, but when in use, these Internal pressure acts to separate the ring cap 3, causing the cotter ring 4 to separate from the ring cap 3.
Since the retainer ring 5 is pressed against the tapered surface 3a of the retainer ring 5 and the bonded state of both members A and B is maintained, the retainer ring 5 does not need to be used in the case of high-pressure fluid with a large pressing force.

(Effects of the invention) As described above, in this invention, an extension part is provided on the holding cylinder part of the female member, extending from the end of the cylinder part to the coupling side, and a tapered surface is formed on the inside of the extension part. Attach the provided ring cap removably,
Inside the extension part, an elastic cotter ring that is shorter than the extension part and has a tapered surface whose outer surface coincides with the inner surface of the tip of the inner tapered surface of the extension part is disposed so as to be movable in the radial and axial directions. The ring is fitted into an annular groove formed at a certain position in the intermediate straight cylindrical portion of the male member, which is a cylindrical body, and its tapered outer surface is pressed against the tapered surface of the ring cap, thereby facilitating the connection of the female member and the male member. Regarding this,
It can be easily and quickly joined by inserting a male member without screwing, and
Since the connecting joint ring and the annular groove of the male member are not in point contact but in surface contact, the surface pressure stress does not become excessive unlike in the case of using balls, and there is no risk of deformation. Due to the wedge effect caused by the press-contact relationship between the tapered surface of the star ring and the tapered surface of the ring cap, the more separation force from the pressure fluid is applied to the female and male members, the stronger the connection between the two members becomes.

Furthermore, if a retainer ring that can be expanded and contracted is used in conjunction with the cotter ring, it is possible to maintain the male member in an immovable state even if an impact is applied to the male member.

[Brief explanation of drawings]

The drawings show an embodiment of this invention, and FIG. 1 is a half-sectional side view with the female and male members separated. FIG. 2A is a perspective view of an example of a cotter ring. Figure B is a perspective view of the retainer ring. FIG. 3A is a half-sectional view showing the state in which the female and male members are initially connected. FIG. 4B is a half-sectional side view showing a state in which the two members have been joined. Fourth
Figures A and B are perspective views of modified examples of the Kotter ring. In the figure, A...female member, B...male member, 1a...
Connection part, 1b...Grip part, 1c...Holding cylinder part, 2
a...Fluid hole, 2b...Medium diameter fitting hole, 2c...
Tapered hole, 2d...Large diameter fitting hole, 3...Ring cap, 3a...Extension portion, 3b...Tapered surface, 4
...Kotter ring, 4a...Tapered surface, 5...
Retainer ring, 6a...Top cylinder part, 6b...Tapered surface, 6d...Middle straight cylinder part, 8...Annular ring.

Claims (1)

[Claims for Utility Model Registration] (1) One side is the connecting part 1a and the other side is the holding cylinder part 1b.
The holding cylinder part 1b of the female member A is made of a cylindrical body.
At the top, there is an extension part 3a extending from the end of the cylindrical part to the coupling side.
A ring cap 3 is removably attached to the ring cap 3, which is provided with a tapered surface 3b that tapers on the inside of the extension part, and inside the extension part 3a, the outer surface is shorter than the extension part and has a tip end of the inner taper surface 3b of the extension part. An elastic cotter ring 4 having a tapered surface 4a that coincides with the inner surface is disposed so as to be movable in the radial direction and the axial direction, and the elastic cotter ring 4 is connected to the tip cylinder part 6a which can be inserted into the female member A and the taper. The male member B, which is a cylindrical body having a surface 6b and an intermediate cylindrical portion 6c, is fitted into an annular groove 8 formed at a certain position in the intermediate cylindrical portion 6c, and the tapered surface 4a of the cotter ring 4 is inserted into the ring cap 3. A pipe joint characterized in that it is brought into pressure contact with a tapered surface 3a of the pipe joint. (2) Inside the extension part 3a of the ring cap 3 attached to the holding cylinder part 1c of the female member A, the retainer ring 5 is arranged side by side on the coupling side of the retainer ring 4, and the retainer ring 5 is arranged along with the retainer ring 4. 5 into the annular groove 8 of the intermediate straight cylindrical portion 6c of the male member B.
A pipe joint according to claim (1) of the utility model registration, which is adapted to be fitted into a pipe fitting.