JPH0396789A - Tube fitting and manufacture thereof - Google Patents

Abstract

PURPOSE:To facilitate connection and separation and reduce cost by forming a connecting member by a strip ring of elastic body, and constituting a female body by a body having a channel part, a first fitting part and a second fitting part, a guide, a guide lock, a separating jig, and a dust-preventing cover. CONSTITUTION:The connecting member of a tube fitting for installing the connecting member on one side of a channel part and an O-ring on the other side by fitting a male body 2 into a female body 3 is formed of a strip ring 10 of elastic body. The female body 3 is formed of a body 59 having the channel part of the O-ring 5, a first fitting part 61 and a second fitting part 62, a guide 55 for mounting the strip ring 10, a guide lock 54 for locking the guide 55, a separating jig 52 for expanding the diameter of the strip ring 10, and an elastic dust-preventing cover 51 covering the separating jig 52. The body 59 and the guide 55 are manufactured by molding. Consequently, the tube fitting can be easily connected and separated, and the form of the tube fitting can be simplified.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to piping for automobiles, construction machinery, machine tools, etc., and is particularly suitable for connecting and disconnecting piping in narrow spaces where it is difficult to use tools. This article relates to pipe fittings and their manufacturing methods.

[Conventional technology]

Conventional pipe joints include ball lock type pipe joints in which the coupling member is made of steel balls, and as shown in Fig. 6, the male body (nose) 2 connected to the pipe 1 is connected to the female body ( This structure is fitted into the body 3, connected by steel balls 8 inserted between opposing recesses, and sealed by an O-ring 5. The steel ball 8 compresses the collar spring 6 and is locked in contact with the lower surface of the inserted collar 4, and the collar 4 is locked on the female body 3 by the retaining ring 7. However, the collar 4 always compresses the collar spring 6 and moves along the outer periphery of the female body 3, making it possible to remove the steel body 8, that is, to inadvertently detach the pipe joint. The collar 4 has the disadvantage that it is easily separated due to vibration or careless external force applied to the collar 4. In addition, it is 4 to 10 times more expensive than a normal screw joint. As an example, the maximum working pressure x temperature is 15kgf
/cm"X 100℃, under the design conditions of working fluid R12, if the outer diameter of pipe 1 is 14.5 ma+ and the inner diameter is 10.5+ am, the outer diameter of male body 2 and female body 3 is 2.
5 Hoho, the outer diameter of collar 4 is 29 mm, the length of male body 2 is 2
6mm. The length of the four bodies 3 is 31 mm+, and the length of the pipe joint after joining is 40 mm.

Instead of a structure that can be used under high pressure, a structure in which the stop ring is formed as an elastic body and the male body and the female body are connected or separated by reducing or restoring its diameter is also considered.
For high-pressure applications, the wire diameter of the stop ring becomes large, and the force required to contract or expand the stop ring becomes large, resulting in the problem of requiring expensive equipment.

On the other hand, depending on the position of the operating notch in the stop ring, if the pipe fittings or the pipe fittings are close to a wall, the device cannot be operated and it may be difficult to remove the fitting. [Problems to be solved by the invention] Conventional pipe joints have problems such as being susceptible to inadvertent disconnection, not necessarily being easy to restore, being expensive, and not designed for high pressure. was there. Depending on the position of the cut arrow part, it may be difficult to separate in a narrow space.
Furthermore, when used outdoors, such as in construction equipment, there is a problem in that the notch becomes clogged with mud and dust, making it difficult to remove.

The purpose of the present invention is to prevent accidental detachment, and
It is an object of the present invention to provide a pipe joint with a simple structure that is easy to connect and disconnect, protects the joint and separation jig from dust, and can withstand high pressure, and a method for manufacturing the same.

[Means to solve the problem]

In order to achieve the above object, the pipe joint according to the present invention has a connecting member on one side and an O-ring on the other side of circumferential grooves provided opposite to each other by fitting the male body into the female body. In a pipe joint that connects or separates the male body and the female body and seals them, the connecting member that connects or disconnects by expanding or contracting the diameter is formed by an elastic stop ring, and the female body is A main body having an O-ring groove, a first fitting part and a second fitting part on the inner periphery, and a stop ring inserted into the first fitting part of the main body and a part cut out. The guide, a guide lock that is attached to the second fitting part of the main body and locks the end of the guide, and the guide lock that slides through the notch of the guide to engage the open end of the stop ring and expand the diameter of the stop ring. The structure consists of a separation jig and an elastic dustproof cover that covers the separation jig.

Then, the male body is inserted into the female body, and a coupling member is attached to one side of the circumferential grooves provided opposite to each other, and an O-ring is attached to the other side of the circumferential groove, and the male body and the female body are coupled or separated. In the manufacturing method of a sealed pipe joint, a connecting member that connects or disconnects by expanding or contracting the diameter is formed by an elastic stop ring, and the female body has the groove of the ○ ring on the inner periphery, the lth a main body having a fitting part and a second fitting part, a guide which is inserted into the first fitting part of the main body and has a stop ring attached thereto and has a part cut out, and a second fitting part of the main body. a guide lock that is attached to the section and locks the end of the guide;
It consists of a separation jig that slides through the notch of the guide and engages with the open end of the stop ring to expand the diameter of the stop ring, and an elastic dustproof cover that covers the separation jig.The main body and guide are molded. This is a configuration manufactured by.

[Effect]

According to the present invention, since the small diameter shaft is formed on the outer periphery of the male body through the trapezoidal groove having the first taper and the second taper, the male body can be inserted into the female body and slid. The stop ring attached to the large diameter side of the two-step groove is guided by the second taper and gradually expanded in diameter, and the trapezoidal groove is fitted to a position opposite to the two-step groove, completing the connection. Then, due to the increase in pressure, the male body is displaced in the counter-fitting direction, and the stop ring is locked on the small diameter side of the two-step groove, thereby maintaining the connection during pressurization. When removing, push the male body from the insertion direction using the first taper as a guide to expand the diameter of the stop ring beyond the position before applying pressure, and then insert it from the axial direction between the protrusions at the open end of the stop ring. The male body can be easily separated from the female body by pressing a separating jig with a predetermined width and expanding the diameter of the stop ring.

The main body and guide are manufactured by molding. [Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1 and FIG. 2, the male body 2 connected to the pipe 1 is fitted into the female body 3, and a connecting member is attached to one side of the circumferential groove portion provided oppositely to each other, and a connecting member is attached to the other side. In a pipe joint in which the male body 2 and the female body 3 are connected or separated and sealed by attaching an O-ring 5 to the holder, a stop ring 10 made of an elastic body is used to connect or separate the connecting member by expanding or contracting the diameter. The female body 3 has a groove 6 of a ring 5 on the inner circumference.
0, a main body 59 having a first fitting part 61 and a second fitting part 62, and a stop ring 10 that is inserted into the first fitting part 61 of the main body 59 and has a part cut out. The guide 55, the guide lock 54 that is attached to the second fitting part 62 of the main body 59 and locks the end of the guide 55, and the guide 55 that slides through the notch and engages with the open end of the stop ring IO. a separation jig 52 for expanding the diameter of the stop ring 10;
This configuration includes a dustproof cover 51 made of an elastic material and covering the separation jig 52.

Then, a small diameter shaft 17 is formed on the outer periphery of the male body 2 via a trapezoidal groove 2 having a first taper 15 facing downward in the direction F of insertion and a second downward taper adjacent to the trapezoidal groove 12. , the guide 55 is provided with a two-stage groove l1 consisting of a small diameter 20 and a large diameter 21 at a position substantially opposite to the trapezoidal groove 12,
Since the end face guide lock 54 is locked in the enlarged diameter state, it will not be disassembled. Furthermore, the separation jig 52 has a predetermined width and is slidable by inserting it through the notch of the guide 55. By pressing the separation jig 52 in the F direction, the fourth
It is inserted between the protrusions l4 provided at the open end of the stop ring A0 shown in the figure.

Further, the dustproof cover 51 is formed of an elastic body such as rubber, and has a cover retainer 53 made of steel attached to the inner surface that contacts the outer periphery of the male body 2.

? Although the cross-sectional shape of the stop ring 10 is generally circular, it may also be rectangular. Also, even if the O-ring groove 60 is formed on the small-diameter shaft 17 of the male body 3, the functions and effects of the present invention will still be obtained. can get.

Next, the operation of the present invention will be explained with reference to FIGS. 1 to 5. When connecting the pipe joint according to this embodiment, first, as shown in FIG. 1, the tip of the male body 2 is pushed in the direction F to fit into the female body 3. By sliding the male body (nose) 2 in the F direction, the stop ring 10 is guided by the second taper 16 and expanded in diameter. By further pushing the male body 2 in the F direction, the stop ring 10 is inserted into the trapezoidal groove 12 and the enlarged diameter is returned to the original diameter. Then, during use, the male body 2 and the female body 3 are subjected to loads in the F■ and F2 directions due to pressure, and are displaced from each other in the F■ and F2 directions.

Therefore, the trapezoidal groove 12 is shifted directly below the small diameter 20 of the two-step groove 11, and the stop ring 10 engages with the small diameter 20 of the two-step groove 11 and the trapezoidal groove 12 to maintain the connection during pressurization.

Next, when detaching, as shown in FIG. 11 and further in the F direction, that is, by moving the male body 2 in two steps in the F direction due to the pressure drop, the stop ring 10 expands in diameter while being guided by the first taper 15. do. And as shown in Figure 5,
The gap Q between the protrusions 14 is wider than the gap q during pressurization, and during this time, the outer diameter of the male body 2 is inserted into the guide from the direction F of the separating jig 52 to reduce the diameter of the stop ring 10. By preventing this and pulling out the male body 2 in the opposite direction to the F direction,
It can be easily separated from the female body 3.

It is easy to press the male body against the female body only when there is no load, but when pressurizing, the load is applied in the opposite direction to the pressing direction, so it becomes impossible to press it manually and separation is impossible.

In addition, in the case of high pressure specifications, it is necessary to increase the wire diameter of the stop ring, but as shown in Figure 4, it is not possible to press a separation jig between the protrusions to hold the stop ring with an expanded diameter. , which is extremely easy compared to diameter reduction, and can be applied as a high-pressure pipe joint.

In addition, the main body and guide of the Illi body are integrally molded by a certain type of mold processing such as forging or press processing, so less machining is required, reducing production time, making it suitable for mass production, and reducing costs. It became.

In addition, even if other pipe fittings or walls are close together, the separation jig can be inserted between the protrusions of the stop ring using the outer diameter of the male body as a guide from the axial direction, preventing the stop ring from shrinking in diameter.
It becomes easier to leave.

Furthermore, by attaching the dustproof cover, mud, dust, etc. are prevented from entering the sealing part, and since it is made of an elastic material such as rubber, it is possible to store the separation jig. [Effects of the Invention] According to the present invention By shaping the female body of the pipe joint with the main body, guide, separation jig, etc., the diameter expansion work of the stop ring can be done even in a narrow space by pressing the separation jig.
In addition to making it easy to connect and disconnect the pipe joint, the shape of the pipe joint is simple, and the shape of the main body and guide can be processed easily, even if the wire diameter of the stop ring becomes thicker due to high pressure specifications and its elastic force increases. This has the effect of reducing costs.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of one embodiment of the present invention when combined, Fig. 2 is a cross-sectional view taken along the line ■-■ of Fig. l, and Fig. 3 is a cross-sectional view of this embodiment when separated. 4 is a sectional view taken along the line IV-IV in FIG. 3, FIG. 5 is a diagram illustrating the state of the stop ring, and FIG. 6 is a sectional view showing a conventional technique. 2...male body, 3...female body, 5...○ ring, 10
...stop ring, 51...dustproof cover 52...
- Separation jig, 54... Guide lock, 55... Guide, 59... Main body. Figure 2 Figure 3

Claims (1)

[Claims] 1. A male body is fitted into a female body, and a connecting member is attached to one side of circumferential grooves provided oppositely to each other, and an O-ring is attached to the other side of the circumferential grooves, and the male body and In the pipe joint that is connected to or separated from the female body and sealed, the connecting member that connects or disconnects by expanding or contracting the diameter is formed of an elastic stop ring, and the female body has the A main body having an O-ring groove, a first fitting part, and a second fitting part, and a guide which is inserted into the first fitting part of the main body to attach the stop ring and has a part cut out. a guide lock that is attached to the second fitting portion of the main body and locks the end of the guide; and a guide lock that slides through the notch of the guide and engages with the open end of the stop ring. 1. A pipe joint comprising: a separation jig for expanding the diameter of the pipe; and an elastic dustproof cover covering the separation jig. 2. Inserting the male body into the female body and attaching a coupling member to one side of circumferential grooves provided oppositely to each other and an O-ring on the other side to couple the male body and the female body. Alternatively, in the method for manufacturing a pipe joint that is separated and sealed, the connecting member that connects or disconnects by expanding or contracting the diameter is formed of an elastic stop ring, and the female body has an O-ring on the inner periphery. a main body having a groove, a first fitting part and a second fitting part; a guide inserted into the first fitting part of the main body to attach the stop ring and having a part cut out; A guide lock is attached to the second fitting part of the main body and locks the end of the guide, and the guide lock slides through the notch of the guide to engage the open end of the stop ring and expand the stop ring. 1. A method of manufacturing a pipe joint, comprising a separation jig having a diameter, and a dustproof cover made of an elastic body that covers the separation jig, and the main body and the guide are manufactured by molding.