JPH06185682A - Pipe joint - Google Patents

Abstract

PURPOSE:To provide a pipe joint which can be easily attached and removed and which can surely prevent unexpected come-off, by forming a trapezoidal cross-sectional shape groove having a tapered surface and having a wide opening, on the outer peripheral surface of a male member, and by fitting a coupling member in a height difference groove formed in the inner peripheral surface of the male member so that a female member is fitted onto the male member. CONSTITUTION:When a pipe joint is coupled, a male member 12 is fitted in a female member 13, and the diameter of a resilient ring-like coupling member 19 fitted in a space defined by grooves 17, 18 formed on the opposing surfaces of the male and female members 12, 13 is enlarged by a taper 14 formed on the front end part of the male part. The coupling member 19 is fitted in a trapezoidal cross-sectional shape groove 20 formed in the outer surface of the male member 12 with its original shape in which the diameter thereof is reduced. In this condition, the pipe joint is used, the male and female members 12, 13 are exerted respectively with oppositely directed forces due a high pressure applied to the pipe joint. In this condition, the coupling member 19 is fitted in a small diameter groove 23 formed between the trapezoidal cross-sectional shape groove 17 and a high difference groove 22, and is pinched between tapers 25, 21 so as to ensure a coupling condition between the male and female members.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to pipes for automobiles, construction machines, machine tools, etc., and particularly to a pipe joint suitable for connecting and disconnecting pipes in a narrow space where it is difficult to use tools and a method for manufacturing the pipe joint. Regarding

[0002]

2. Description of the Related Art Among conventional pipe joints, there is a ball lock type pipe joint in which a connecting member is formed of steel balls, and a male body (nose) 2 connected to a pipe 1 as shown in FIG. Is inserted into the female body (body) 3, is joined by the steel balls 8 inserted between the respective facing concave portions, and is sealed by the O-ring 5.

The steel ball 8 is locked by contacting the lower surface of the collar 4 inserted by compressing the color spring 6, and the collar 4 is locked by the female body 3 by the stop ring 7. However, since the collar 4 always moves along the outer circumference of the female body 3 by compressing the collar spring 6, the steel body 8 can be removed, that is, the pipe joint can be unintentionally removed, which is not safe and Further, there is a drawback that the collar 4 is easily detached due to vibration or careless external force applied to the collar 4. In addition, the price is 4 to 10 times more expensive than the ordinary screwed joint.

As an example, the maximum working pressure × temperature is 15 k
gf / cm ² × 100 ℃, the design conditions of the working fluid R12, the outer diameter of the pipe 1 is _14-5 mm, inner diameter _10,
In the case of 5 mm, the outer diameter of the male body 2 and the female body 3 is 25 mm,
The outer diameter of the collar 4 is 29 mm, the length of the male body 2 is 26 mm,
The length of the female body 3 is 31 mm, and the length of the pipe joint after joining is 4
It is 0 mm.

And, it is not a structure that can be used for high pressure,
A structure may be considered in which the stop ring is formed as an elastic body and the male body and the female body are joined or separated by reducing or restoring the diameter, but for high pressure, the diameter of the stop ring becomes large and the diameter of the stop ring decreases. Alternatively, there is a problem that the force for expanding the diameter becomes large and an expensive instrument is required. On the other hand, depending on the position of the notch for operation of the stop ring, when the pipe joints or pipe joints approach the wall, there is a problem that the device cannot be operated and detachment becomes difficult.

[0006]

In such a conventional pipe joint, there is a risk that it may be accidentally disengaged, recovery is not always easy, it is expensive, and it is not a structure for high pressure. There was a point. Further, depending on the position of the cutout portion, there is a problem that it is difficult to remove it in a narrow space, and when it is used outdoors such as construction equipment, the cutout portion is clogged with mud or dust, making it difficult to remove.

An object of the present invention is to provide a pipe joint having a simple structure capable of preventing accidental disengagement, facilitating coupling and disengagement, dustproofing the coupling part and the separating jig, and withstanding high pressure. To provide.

[0008]

To achieve the above object, the present invention has the following constitution. That is, the gist thereof is a tubular male body and a female body that are both connected from a tubular body, and the male body is fitted into the female body, and a circumferential groove portion is formed on one of the facing surfaces thereof. The seal O-ring is attached to one to maintain the sealing property, and the annular coupling member is fitted into the space secured by the circumferential grooves formed on the opposing surfaces of the two bodies. In the pipe joint in which the body is integrated, the connecting member is a connecting member made of an elastic material whose diameter can be expanded or reduced when viewed from the pipe body, and the expanded or reduced diameter facing the connecting member. And a ring guide for accommodating the coupling member in the groove on one side, the pipe joint comprising a male body and a female body slidably in the axial direction of the pipe body,
Speaking especially of the space where the connecting member is fitted, one is that the groove on the male side has a trapezoid with a wide mouth in the axial cross section, and the groove on the female side is a step groove with a small diameter on the front side of the male body and a large diameter on the rear side. The other one is a pipe joint in which the groove portion on the female body side has a trapezoidal shape with a wide mouth in the axial direction cross section, and the groove portion on the male body side is a step groove having a large diameter on the front side for inserting the male body and a small diameter on the rear side.

More specifically, the large-diameter portion of the step groove has a sufficient space for accommodating the expanded or reduced-diameter coupling member. Further, in the above-mentioned annular guide, the tip end is inserted between the male body and the female body, and the connecting member is expanded or reduced in diameter by merely pressing the same in the axial direction of the pipe, and the both bodies are expanded. To facilitate the separation of.

[0010]

The operation of the present invention will be described with reference to its concrete example. A wide-mouthed trapezoidal groove having a taper surface is formed on the outer peripheral surface of a male body, and the male body is fitted into a female body to slide. By moving, the connecting member made of an elastic body, which was mounted on the large-diameter groove side of the stepped groove formed on the inner peripheral surface of the female body, expands in diameter, and reaches the trapezoidal groove to reduce the diameter. Combined and integrated. Then, due to the increase in pressure, a force is exerted on the male body to shift it in the opposite fitting direction, the coupling member is locked to the small diameter side of the stepped groove, and in this state, the coupling during pressurization (when in use) is maintained.

On the other hand, at the time of separation, the male body is pushed beyond the position before pressurization. As a result, the connecting member is pushed by the taper of the trapezoidal groove formed in the male body and retracts to move from the small diameter portion of the step groove to the large diameter portion. Further, the connecting member rides over the trapezoidal groove, expands to the outer peripheral surface of the male body in the large-diameter portion of the step groove, and rides up.

In such a state, the annular guide is pressed in the pushing direction of the male body, the guide tip is inserted into the inside of the coupling member to prevent the diameter reduction of the coupling member, and the male body is pulled out in this state. is there.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of the present invention will be described below with reference to the drawings, but it goes without saying that the present invention is not limited to this example. FIG. 1 is a partially cutaway sectional view of a first embodiment of a pipe joint 11 of the present invention. Now, a male body 12 connected by a tube body (not shown) is fitted in a similar female body 13, and a taper 14 is formed on the outer peripheral surface of the distal end of this male body 12 to form a tapered distal end. The taper 14 has a function of expanding the diameter of the connecting member when connecting the male body 12 and the female body 13 as described later.

On the other hand, a groove 15 is formed on the inner peripheral surface of the female body 13, and an O-ring 16 made of a rubber-like elastic material is mounted in the groove 15 to seal between the two bodies 12, 13. ing. The groove 15 may be formed on the front surface side of the male body 12, and the O-ring 16 may be attached thereto. Grooves 17 and 18 are formed on the opposing surfaces of the two bodies 12 and 13, respectively, and an annular coupling member 19 made of an elastic body is fitted in the space formed by the both grooves.

First, the groove 17 provided in the male body 12 is preferably a triangular groove having a wide mouth cross section, more preferably a trapezoidal cross section, and it is preferable to form the tapers 20 and 21 in the front and rear. . Such a taper 20 is mainly for moving the connecting member 19 at the time of separation, and one taper 21 is for connecting the connecting member 1 during use under high pressure.
9 is a surface for supporting 9.

On the other hand, a groove 18, that is, a stepped groove 22 having a small diameter and a large diameter is formed on the female body 13 side. In this example, the small diameter groove 23 is located on the tip side of the large diameter groove 24. , Especially the end of the small diameter groove 23 and the small diameter groove 23 and the large diameter groove 24.
An example is shown in which tapers 25 and 26 are formed in the middle of the above. This taper 25 is the same as the above-mentioned taper.
20 serves to sandwich and support the connecting member 19, while the taper 26 serves as a small-diameter groove 23 of the connecting member 19.
Between the large-diameter groove 24 and the large-diameter groove 24, that is, for smoothing the expansion and contraction of the connecting member 19. The groove 18 may be a cross-section (right angle) triangular or trapezoidal groove that functions as the step groove 22 in some cases. The tip 28 of the annular guide 27 is inserted into the gap between the male body 12 and the female body 13, and the other end 29 of the annular guide 27 is elastically provided in a groove 30 provided on the outer peripheral side of the female body 13. In the figure, reference numeral 31 is a rubber-like dustproof cover that covers the annular guide 27.

Next, the connection and separation of the two bodies will be described with reference to the drawings. First, when the two bodies are joined, FIG. 2 shows a state in which the male body 12 is slightly fitted into the female body 13. In this figure, each symbol is as shown in the previous figure.

By further fitting the male body 12 in the F direction, the taper 14 formed at the tip of the male body 12 is fitted in such a state that the connecting member 19 is expanded from the inside. The connecting member 19 is an elastic ring, a part of which is cut out, and is gradually expanded in the large-diameter groove 24 and contracted to the initial diameter in the groove 23 having a trapezoidal cross section formed on the outer surface of the male body 12. It will be stored after being calibrated. The state where the coupling member 19 is housed in the groove 23 is as shown in FIG.

The condition during use is as shown in FIG. 1, and since high pressure is applied during use of this pipe joint, the male body 1
2 and the female body 13 receive a force in the opposite directions and are slightly displaced in the opposite directions. That is, the male body 12 is displaced in the direction opposite to the F direction, and the female body 13 is displaced in the F direction. That is, the connecting member 19 is fitted between the trapezoidal groove 17 and the small-diameter groove 23 forming the stepped groove 22, and this is sandwiched by the taper 25 and the taper 21 so that the two are joined at the time of pressurization. Will be held.

As described above, pressing the male body 12 against the female body 13 in the F direction can be easily performed only when there is no load, but when applying pressure, a large load is applied in a direction opposite to the pressing direction, so that it cannot be manually performed. Since pressing cannot be performed and careless separation cannot be performed during pressurization, safety is maintained.

Next, at the time of separation, first the pressure inside the pipe joint 11 is lowered, and then the male body 12 is pushed in the F direction. Then, the connecting member 19 is pushed by the taper 20 formed in the trapezoidal groove 17 and pushed out of the small diameter groove 23 into the large diameter groove 24. Then, the diameter of the connecting member 19 is further expanded, and the connecting member 19 comes out of the taper 20 of the trapezoidal groove 17 and rides on the outer peripheral surface of the male body 12. FIG. 3 is a sectional view showing this state.

After reaching such a state, the annular guide 27 is generally pressed in the F direction together with the dustproof cover 31. By this pressing, the tip 28 of the annular guide 27 interrupts between the coupling member 19 and the male body 12, and holds the coupling member 19 in the large-diameter groove 24 in a state where the diameter thereof is expanded.

When this state is reached, the male body 12 can be easily separated by pulling it out in the direction opposite to F. FIG. 4 shows a state in which the male body 12 is pulled out from the female body 13. For this reason, it is preferable that the tip end 28 of the annular guide 27 has a tapered cross-sectional triangular shape so as to facilitate interruption between the male body 12 and the coupling member 19.

Of course, if the pressing force on the annular guide 27 is slightly relaxed from this state, the relationship between the connecting member 19 and the tip 28 of the annular guide 27 is broken, and the connecting member 1 is easily formed.
The diameter reducing force of 9 restores the original diameter and allows repeated use.

FIG. 5 shows another example of the annular guide 27 used in the pipe joint of the present invention. In this example, the annular guide 27 is inserted between the main body and the male body 12 and the female body 13. In this example, the main body portion is made of synthetic resin and the front end portion is made of metal. In the case of the illustrated example, the connection between the two is achieved by the groove 32 provided on the tip member 29 side.
The inner peripheral end 33 of the main body is fitted inside, and the annular guide can be obtained easily and inexpensively.

FIG. 6 is a partially cutaway sectional view showing a second embodiment of the pipe joint 11 of the present invention. In this example, a female body 13 is shown.
A groove 34 having a trapezoidal cross section as shown in the wide mouth is formed on the inner peripheral surface of the
Correspondingly, a step groove 37 composed of a small-diameter groove 35 and a large-diameter groove 36 is formed in the male body 12, and in this case, the small-diameter groove 35 is arranged on the tip side of the male body 12. Is.

In this example, the connecting member 19 is once expanded in diameter and mounted in the step groove 37. The connecting member 19 returns to the initial diameter in the large-diameter groove 36, but the outer shape of the connecting member 19 is selected to be larger than the outer shape of the male body 2, and when the connecting member 19 is reduced in diameter. The size and shape that fits within the large-diameter groove 36 is selected.

When used under high pressure, the connecting member 19 is in the small-diameter groove 35, and the taper-3 of the trapezoidal groove 34 is formed.
8 and the taper 39 of the small-diameter groove 35, the two bodies are prevented from being joined and separated.

On the other hand, at the time of separation, the male body 12 is pushed in the F direction. Then, the connecting member 19 is prevented from moving by the taper 40 on the other side of the trapezoidal groove 34 and the diameter of the connecting member 19 is reduced. Get stuck. After this state, the annular guide 27
Is pressed so that the tip 28 thereof is interrupted between the female body 13 and the coupling member 19, and the male body 12 is pulled out while the reduced diameter of the coupling member 19 is maintained.

[0030]

According to the present invention, not only the coupling as a pipe joint but also the separation is easy, and the coupling and separation of the pipe joint can be easily performed even in a narrow working space, and the shape of the pipe joint is simplified. It has the effect of reducing the cost.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of a first embodiment of a pipe joint 1 of the present invention.

FIG. 2 is a cutaway sectional half view showing a state of a joining process.

FIG. 3 is a half sectional view showing a state at the time of separation.

FIG. 4 shows the male body 2 as described above from within the female body 3.
FIG. 4 is a partially cutaway cross-sectional view showing a state in which is pulled out.

FIG. 5 is a partially cutaway sectional view showing another example of the annular guide used in the present invention.

FIG. 6 is a half sectional view showing another embodiment of the present invention.

FIG. 7 is a partially cutaway sectional view of a conventional ball-lock type pipe joint.

[Explanation of symbols]

 11 Pipe Joint 12 Male Body 13 Female Body 15 Female Internal Surface Groove 16 O-Ring 17 Groove Provided in Male Body 18 Groove Provided in Female Body 19 Coupling Member 20, 21, 38, 40 (Trapezoidal) Groove Tee Par 22, 37 Step groove 23, 35 Small diameter groove 24, 36 Large diameter groove 25, 26, 39 Tapered inside step groove 27 Annular guide 28 Tip of annular guide 29 End of annular guide 30 Outer peripheral side of female body Recessed groove 31 Dust-proof cover 32 Groove provided on the tip member side of the annular guide 33 Inner peripheral end of the main portion of the annular guide 34 Female groove

Claims (4)

[Claims] 1. A tubular male body and a female body, both connected from a tubular body, wherein the male body is fitted into a female body, and a circumferential groove is formed on one of the facing surfaces, and the groove is formed in the groove. -A ring O-ring is attached to maintain the sealing property, and an annular coupling member is fitted in the air space secured by the circumferential grooves formed on the opposing surfaces of both bodies to integrate them. In the pipe joint, the connecting member is a connecting member made of an elastic material capable of expanding or contracting its diameter when viewed from the pipe body, and facing the connecting member to cause its expanding or contracting diameter. A pipe joint, characterized in that an annular guide for accommodating the coupling member is provided in the groove portion on the side so as to be slidable in the axial direction of the pipe body between the male body and the female body. 2. The air space in which the coupling member is fitted has a groove on the male side having a trapezoid with a wide mouth in an axial cross section, and the groove on the female side is a stepped groove having a small diameter on the front side of the male body and a large diameter on the rear side. The pipe joint according to claim 1. 3. An air space in which the coupling member is fitted has a groove on the female side having a wide mouth trapezoid in an axial cross section, and a groove on the male side is a stepped groove with a large diameter on the front side of the male body and a small diameter on the rear side. The pipe joint according to claim 1. 4. The pipe joint according to claim 1, wherein the large-diameter portion of the step groove has an empty space sufficient to accommodate the expanded or reduced diameter of the coupling member.