JPH0735873B2 - Pipe fittings for hydraulic piping - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pipe joint for hydraulic piping applied to piping of high-pressure hydraulic equipment, and more specifically, it is effective in enhancing a function of mounting an elbow to hydraulic equipment. Pipe fittings.

(Prior Art) FIG. 7 shows a conventional 90 ° elbow with a seat. As shown, the elbow body 41 has a threaded portion 42 for connection with a pipe on the outer circumference on one end side and a hydraulic device on the outer circumference on the other end side.
It has a screw part 43 for mounting to 47
The mounting to the 47 is performed by screwing the mounting screw portion 43 into a mounting port 48 of the hydraulic device 47 to a predetermined position to determine the direction of the pipe connecting end, and then tightening the backup washer 45 with the lock nut 44. Then, by tightening the lock nut 44, the O-ring 46 is crushed and the outer peripheral surface of the elbow body 41, the backup washer 45,
The inner peripheral surface of the hole of the hydraulic device 47 is in close contact with and sealed.

(Problems to be Solved by the Invention) However, in the case of the above-described seated elbow, when the screw is screwed into the hydraulic device 47, a turning radius of dimension l in the drawing is required. Therefore, when many pipes are installed in a limited space such as an oil control valve of a forklift, in order to avoid interference with adjacent pipe joints,
For example, it is necessary to take measures such as changing the rising dimension of each pipe joint. In other words, with the conventional elbow with seat, it is necessary to consider the mounting space, mounting method, etc. on the hydraulic equipment side, and there are difficulties in centralized mounting, mounting in narrow spaces, and partial removal for replacement after completion of assembly. is there.

Also, due to the protrusion phenomenon of the O-ring 46 and the slidability of the backup washer 45 with respect to the elbow body 41, the manufacturing precision of the backup washer inner diameter and the O-ring groove outer diameter of the elbow body 41 must be considerably increased. There are some drawbacks.

Then, in view of the above-mentioned problem, an object of the present invention is to provide a pipe joint for hydraulic piping, which enables the elbow body to be attached to a hydraulic device without rotating the elbow body.

(Means for Solving the Problems) In order to solve the above problems, the present invention is configured as follows.

That is, the pipe joint for hydraulic piping of the first invention is provided with a pipe connecting portion at one end in the axial direction, and is provided with a left-hand thread and an annular screw relief groove continuously in the axial direction at the other end. And an elbow body, and a cylindrical adapter having a left screw and an annular screw relief groove at one end in the axial direction, and a right male screw for mounting a device and an O-ring groove on the outer periphery of the other end. The left screw of the elbow body and the left screw of the adapter press the O-ring interposed between the elbow body and the adapter by screwing each other, and when the screwing is completed, the O-ring intervenes in the corresponding screw relief groove. It is configured to be movably fitted.

Further, the pipe fitting for hydraulic piping of the second invention is an elbow provided with a connecting portion for piping at one end portion in the axial direction and one of a ring groove and a male screw on the outer periphery of the other end portion. Body and
A tubular adapter provided with either the ring groove or the female screw on the outer circumference of one end in the axial direction, and the external adapter on the outer circumference of the other end with a male screw and an O-ring groove for mounting a device, and an axial direction. Is provided with an inwardly projecting portion that is fitted in the ring groove so as to be freely rotatable, and the other end has an inner peripheral surface that is provided with a female screw that can be screwed into the male screw. The nut member of the above, and the female screw of the nut member in a state where the protruding portion is fitted in the ring groove is fastened to the male screw, thereby interposing an O-ring between the elbow body and the adapter. Originally, it is configured to be joined in a butt shape.

(Operation) In the hydraulic pipe fitting of the first aspect of the invention configured as described above, the left screw of the elbow body is screwed into the left screw of the adapter so that the elbow body and the adapter are interposed at the joint. The O-ring was crushed with an appropriate crushing allowance, and when the screwing was completed, both screws entered the corresponding screw relief grooves and rotatably fitted, and thus the seal at the joint between the elbow body and the adapter was secured. It is fitted so that it can rotate freely. Therefore, thereafter, without turning the elbow body, the adapter can be screwed and attached to the hydraulic device with the pipe connection end portion maintained in the desired orientation.

At this time, the O-ring for the mounting portion fitted in the O-ring groove of the adapter is crimped to the hydraulic equipment side by the O-ring seat surface of the adapter to seal the hydraulic equipment.

Further, in the pipe joint for hydraulic piping according to the second aspect of the present invention, since the nut member can freely rotate with respect to the adapter or the elbow body when the nut member is temporarily tightened with respect to the elbow body or the adapter, While keeping the pipe connection end of the elbow body in the tightened state and screwing the adapter into the hydraulic device, the O-ring for the mounting part fitted in the O-ring groove of the adapter is attached to the adapter. The surface of the O-ring is pressed against the hydraulic equipment to seal the space with the hydraulic equipment.

After mounting the adapter, if the nut member is fully fastened to the elbow body or the adapter, the elbow body is butt-joined to the adapter, and the O for the joint portion interposed between the elbow body and the adapter at that time. The ring is crushed and the seal is secured.

That is, the pipe joints of the first invention and the second invention can both be attached to the hydraulic equipment without rotating the elbow body.

(Example) Hereinafter, the Example of this invention is concretely described based on drawing.

First, Embodiment 1 will be described with reference to FIGS. 1 and 2. The pipe joint of the first embodiment comprises a 90 ° elbow body 1 and an adapter 8 as shown in FIG.

As shown in FIG. 2, the elbow main body 1 is provided with a male screw 2 for pipe connection on the outer circumference of the pipe connection end, and a small diameter portion is provided on the outer circumference of the end portion on the joint side with the adapter 8 from the tip to the middle side. 3,
The structure is such that the tapered O-ring seat surface 4, the large diameter portion 5, the left male screw 6 having a diameter slightly larger than the large diameter portion 5, and the annular screw relief groove 7 having a diameter smaller than the left male screw 6 are provided in the above order. ing.

On the other hand, the adapter 8 is formed in a substantially cylindrical shape, and the inner periphery thereof has a left female screw 9 to be engaged with the left male screw 6 and an annular screw escape having a diameter larger than the left female screw 9 from the upper end to the lower end. The groove 10, the large-diameter hole 11 into which the large-diameter portion 5 can be fitted, the small-diameter hole 12 into which the small-diameter portion 3 can be fitted, and the minimum-diameter hole 13 having a smaller diameter than the small-diameter hole 12 are provided in the above order, and On the outer periphery, a hexagonal part 14 for fitting a spanner is provided at the middle part, a right male screw (parallel screw) 15 for mounting at the lower end, and an O-ring groove 16 is provided between the hexagonal part 14 and the right male screw 15. It has a built-in structure. In addition,
The lower surface of the hexagonal portion 14 is the O-ring sheet surface 17.

Then, the elbow body 1 and the adapter 8 configured as described above are joined as follows. As shown in FIG. 1, first, an O-ring 18 for a connecting portion is fitted on the tapered O-ring seat surface 4 of the elbow body 1, and then the left male screw 6 of the elbow body 1 is attached to the left female thread of the adapter 8. Screw it into the screw 9 by rotating it counterclockwise. By this screwing, the small diameter portion 3 fits into the small diameter hole 12 and the large diameter portion 5 fits into the large diameter hole 11, and the O-ring 18 is pressed against the step surface between the large diameter hole 11 and the small diameter hole 12. Then, at the final stage of screwing, that is, at the time of completion of screwing, the O-ring 18 is compressed with a proper crushing allowance in the triangular groove having a cross section formed by the tapered O-ring sheet surface 4 and the step surface.

On the other hand, when the screwing is completed, the left male screw 6 is inserted into the screw relief groove 10 of the adapter 8 and the left female screw 9 is fitted into the screw relief groove 7 of the elbow body 1 so as to be freely rotatable, and thus the elbow body 1 and the adapter are fitted. 8 is connected to the O-ring 18 so as to be freely rotatable while ensuring a seal.

Therefore, when mounting on the hydraulic device 20, the adapter 8 is rotated clockwise while the connection end of the elbow body 1 is set in a desired direction, and the mounting right male screw 15 is attached to the mounting port of the hydraulic device 20.
By screwing into the elbow 21, the elbow main body 1 can be attached while maintaining its direction without rotating. When the adapter 8 is screwed in, the elbow body 1 is pressed against the adapter 8 by the mutual engagement of the screw end faces by the repulsive force of the O-ring 18, but the screws do not mesh because they are left-handed screws.

When the adapter 8 is completely screwed, the adapter 8
O-ring for mounting part fitted in O-ring groove 16
19 is crushed by the O-ring seat surface 17 on the lower surface of the hexagonal portion 14 to seal between the adapter 8 and the hydraulic equipment 20, and the O-ring seat surface 17 is fixed in close contact with the flat surface of the hydraulic equipment 20.

As described above, according to the pipe joint of the present embodiment, it is not necessary to select the directionality of the elbow body 1 while screwing it into the hydraulic device 20, and the backup washer and the lock nut can be omitted. Therefore, the O-ring found in the backup washer system can be omitted. It is no longer necessary to consider the protrusion phenomenon of In addition, since the elbow body 1 is allowed to move to the adapter 8 to some extent in the assembled state, it has a function of absorbing vibration from the connection pipe side and is effective in preventing loosening.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. The pipe joint of the second embodiment includes an elbow body 1, an adapter 8 and a coupling nut 24,
The coupling between the elbow body 1 and the adapter 8 is by a coupling nut 24, and the seal portion between the elbow body 1 and the adapter 8 is by an O-ring face seal system.

That is, the stepped cylindrical portion 22 of the elbow main body 1 is fitted into the adapter 8 side in a butt shape, and the O-ring 18 for the joint portion is interposed between the fitting surfaces. Right male screw 23 on the upper outer circumference
Is provided. The elbow body 1 and the adapter 8
With respect to the above, the same components as those in the first embodiment described above are designated by the same reference numerals and the description thereof is omitted.

On the other hand, the ring-shaped coupling nut 24 corresponds to the left male screw 25 corresponding to the left male screw 6 of the elbow body 1 at one end on the inner periphery and the right male screw 23 for coupling the adapter 8 to the other end on the inner periphery. Is provided with a right female screw 26, and between the both screws 25, 26 is a screw relief groove 27 having a larger diameter than that.

Therefore, when the coupling nut 24 is rotated counterclockwise and the left female screw 25 is screwed into the left male screw 6 of the elbow body 1, the screw is eventually removed and the left female screw 25 is screwed into the screw relief groove of the elbow body 1. 7 and the left male screw 6 is the coupling nut 24
It fits into the screw escape groove 27 of. That is, the coupling nut 24 is attached to the elbow body 1 so as to be freely rotatable. Subsequently, the adapter 8 is attached by rotating the coupling nut 24 clockwise and screwing the right female screw 26 into the coupling right male screw 23 of the adapter 8. Thus, the three members will be joined.

To attach the pipe joint thus assembled to the hydraulic device 20, first, the coupling nut 24 should be attached to the adapter 8.
Is temporarily tightened, and the direction of the elbow body 1 is determined and the direction is maintained, and the adapter 8 and the coupling nut
24 is rotated clockwise and the right male screw 15 for mounting is screwed into the mounting port 21 of the hydraulic device 20 and fixed. Next, when the coupling nut 24 is fully tightened with respect to the adapter 8, the elbow main body 1 is brought into engagement with the mutual end surfaces of the left male screw 6 and the left female screw 25.
Are attracted to the adapter 8 side and fixed in a butt shape, and at this time, the O-ring 18 for the coupling portion is compressed and sealed with an appropriate crushing margin.

Thus, also in the case of the second embodiment, the elbow body 1 can be attached to the hydraulic device 20 without rotating, as in the first embodiment.

Next, a third embodiment of the present invention will be described with reference to FIG. In the pipe joint of the third embodiment, the coupling nut 24 of the second embodiment is replaced with a crimping nut 28, and other configurations are the same as those of the second embodiment, and therefore, the same reference numerals are given and described. Omit it.

The crimping nut 28 is integrally provided with a ring-shaped inwardly extending portion 29 continuously with the nut portion having the right female screw 26. The protruding portion 29 is formed in the elbow body 1 in a ring groove. 30 is loosely fitted by drawing plastic working by a press, and a virtual line shows a state before working (before fitting). The right female screw 26, which is the nut portion of the crimping nut 28, is the right male screw 23 on the outer periphery of the upper part of the adapter 8.
Is screwed onto.

Therefore, in the case of the third embodiment, the hydraulic device 20 can be assembled in the same manner as the second embodiment except that the crimping nut 28 is attached to the elbow body 1.

Next, a fourth embodiment of the present invention will be described with reference to FIG. In the pipe joint of this embodiment, the mounting relationship of the crimping nut 28 in the third embodiment with respect to the elbow body 1 and the adapter 8 is reversed.

That is, a ring groove 30 is formed on the outer periphery of the upper portion of the adapter 8 and the overhanging portion 29 of the crimping nut 28 is fitted in the ring groove 30 in a freely rotatable manner. Is formed and the right female screw 26 of the nut portion of the crimping nut 28 is screwed into this, and other configurations are the same as in the third embodiment.

Therefore, the assembling of the pipe joint of this example to the hydraulic device 20 is similar to that of the second or third embodiment except that the crimping nut 28 is attached to the adapter 8. After being screwed into the device 20 and fixed, the crimping nut 28 can be assembled to the elbow main body 1 by fully tightening it.

Although the present invention has been illustrated and described with reference to the preferred embodiments, various modifications can be made without departing from the spirit of the present invention, and the present invention is not necessarily limited to the form illustrated here. Instead, for example, in Embodiment 1 shown in FIGS. 1 and 2, the joint portion between the elbow body 1 and the adapter 8 is changed to a fitting type in which the adapter side is a male member and the elbow body side is a female member. It is possible.

(Effects of the Invention) As described in detail above, according to the pipe joint of the present invention, when attaching to hydraulic equipment, the elbow body is not rotated, and the pipe connection end is attached in a desired orientation. Therefore, when arranging a large number of pipe joints in hydraulic equipment, measures such as changing the rising dimension to avoid interference with adjacent pipe joints are not required and the installation space is reduced, and a large number of pipe joints are achieved. It is possible to arrange the joints intensively and effectively in a narrow space.

In addition, the work of attaching to the hydraulic equipment is simplified and the efficiency is improved, and the removal work when removing a part of the pipe joint intensively assembled to the hydraulic equipment can be easily performed.

Furthermore, since the pipe joint of the present invention does not require direction adjustment while screwing into the hydraulic equipment, the backup washer and lock nut, which were required in the conventional seated elbow, are omitted, and as a result, the O-ring is eliminated. It is not necessary to consider the protrusion phenomenon, slidability, etc., which is effective in improving manufacturability.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a hydraulic pipe fitting according to a first embodiment of the present invention, FIG. 2 is a half sectional view showing the same in an exploded manner, and FIG. 3 is a hydraulic piping pipe according to a second embodiment of the present invention. Fig. 4 is a half sectional view showing a joint, Fig. 4 is a half sectional view showing the same in an exploded manner, Fig. 5 is a half sectional view showing a pipe joint for hydraulic piping according to a third embodiment of the present invention, and Fig. 6 is an embodiment of the present invention. FIG. 7 is a half sectional view showing a pipe joint for hydraulic piping of Example 4, and FIG. 7 is a longitudinal sectional view showing a conventional elbow with a seat. 1 …… Elbow body, 6 …… Left male screw 7 …… Screw relief groove, 8 …… Adapter 9 …… Left female screw, 10 …… Screw relief groove 15 …… Right male screw, 24 …… Coupling nut 25 ...... Left female screw, 26 …… Right female screw 27 …… Screw relief groove, 28 …… Crimping nut 29 …… Overhanging portion, 30 …… Ring groove

Claims (3)

[Claims] 1. An elbow body 1 having a pipe connecting portion 2 at one end in the axial direction, and a screw portion 6 and an annular screw relief groove 7 continuously at the other end in the axial direction. , The axial end has a threaded portion 9,25 and an annular screw relief groove 10,2.
7 and a screw part 15 and an O
A tubular adapter 8 having a ring groove 16, a threaded portion 6 of the elbow body 1 and a threaded portion 9 of the adapter,
25 and the elbow body 1 and the adapter 8 by screwing each other
A pipe joint for hydraulic piping which pressurizes an O-ring 18 interposed between and, and in a fully screwed state, fits into corresponding screw relief grooves 7, 10 and 27 in a freely rotatable manner. 2. The pipe joint for hydraulic piping according to claim 1, wherein the adapter 8 includes a nut member 24 for connecting with the elbow body 1. 3. An elbow main body 1 provided with a connecting portion 2 for piping at one end portion in the axial direction and at least one of a ring groove 30 and a screw portion 31 at the other end portion; The other end of the ring groove 30 and the screw part 23 is provided at one end, and the screw part 15 for mounting the device is provided on the outer periphery of the other end.
And a cylindrical adapter 8 provided with an O-ring groove 16, and an inwardly projecting portion 29 which can be fitted in the ring groove 30 so as to be freely rotatable at one end portion in the axial direction, and has an inner circumference at the other end portion. The surface is composed of a substantially ring-shaped nut member 28 having a screw portion 26 that can be screwed into the screw portions 23 and 31, and the nut member in a state where the protruding portion 29 is fitted in the ring groove 30.
A hydraulic pipe having a structure in which the elbow body 1 and the adapter 8 are joined in a butt shape by interposing an O-ring 18 between the end faces by tightening the screw portion 26 of 28 to the screw portions 23 and 31. Pipe fittings.