JP3434755B2 - Fluid pipe connection structure of fluid equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pipe connection structure for fluid equipment, and more particularly to a structure for connecting a fluid pipe such as a tube to a connection portion formed in a fluid equipment body such as a valve block.

[0002]

2. Description of the Related Art For example, as shown in FIG.
An external fluid pipe 12 such as a tube is formed by forming a connection portion 101 in a main body flow path 102 of a fluid device 100 such as a valve block.
Concatenation with 0 is done. The connection with the fluid pipe 120 at the connection portion 101 in the device body 100 as described above allows the connection distance to be shortened by utilizing the pad portion of the device body 100, and the space can be effectively used. Since it does not project to the side, there is an advantage that it is safe and troubles due to contact are less likely to occur. However, on the other hand, since the connection is made within the main body of the device, there is a problem that the work becomes complicated or the seal cannot be completely completed.

For example, in the example of FIG. 12, the fluid pipe 120 is inserted into the inner peripheral cylindrical portion 111 of the mounting member 110, and the tip portion 12 thereof is inserted.
1 is unfolded in a half-folded state and mounted, and the main body flow path 102
The inner peripheral threaded portion 103 of the connecting portion 101 and the outer peripheral threaded portion 112 of the mounting member 110 are screwed to each other, and the expanded tip portion 121 of the fluid pipe 120 is attached to the crimping surface 10 of the main body connecting portion 101.
5 is pressed and fixed. However, in this example,
There is a problem that the half-opened state of the fluid pipe 120 is not stable, and this processing cannot be performed with the fluid pipe 120 having a large diameter. Further, since the widened tip 121 of the fluid pipe 120 and the crimping surface 105 of the main body connecting portion 101 form a face seal, the sealing force is weak and is weak against the force on the outer side in the axial direction. Further, there is a drawback that the fluid pipe 120 is often twisted when the mounting member 110 is screwed and tightened, and this twist loosens the screw of the mounting member 110 with time.

Another example is shown in FIG. In this example, the fluid pipe 1 is attached to the inner cylindrical portion 141 of the mounting member 140.
The wedge ring 150 is press-fitted onto the outer periphery of the tip end portion 161 of the connecting portion 131 of the main body flow passage 132 and the outer peripheral screw portion 142 of the mounting member 140 by screwing. The wedge ring 150 is pressed to connect the fluid pipe 160 to the main body flow path 132. This structure is relatively simple, the diameter of the fluid pipe 160 is not selected, and it is not necessary to increase the size of the connecting portion 131, however, as can be seen from the figure, it has a problem that it is easily pulled out. Also,
Since it is difficult to cut the fluid pipe 160 at a right angle in this structure, a space S is likely to be formed at the tip portion 161 of the fluid pipe 160, and a so-called liquid pool portion is exposed. Such a liquid pool portion is a fatal defect in the structure for connecting the conduits for ultrapure water, chemical liquids, and the like.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above points, and has a structure in which a fluid pipe is connected to a connection portion in the main body of an apparatus, and has a high sealing performance with a simple structure. The present invention proposes a novel fluid pipe connection structure for a fluid device, which can reliably and stably obtain the above, and which does not form a liquid pool.

[0006]

That is, according to the invention of claim 1, a main body flow path (22) formed in an equipment main body (20 ).
An inner peripheral threaded portion (23) formed concentrically with the inner peripheral threaded portion, an annular portion (25) formed inside the inner peripheral threaded portion and having a diameter smaller than the inner peripheral threaded portion, and the small diameter annular portion An annular crimping portion (30) formed on the inside of the outer side of the main body flow path ,
A ring formed on the inner peripheral side of the annular crimp portion so as to project outward.
Connecting part (21) of the device main body having the concave concave curved surface part (35) or the annular taper surface part (37), and the outer peripheral threaded part screwed with the inner peripheral tubular part (41) and the inner peripheral threaded part of the connecting part. (42)
A mounting member (40) having: and a folded-back curved surface part that is inserted into the inner peripheral tubular portion of the mounting member and has its tip bent back outward.
(51) the fluid pipe (50), and when the attachment member to which the fluid pipe is attached is screwed and fastened to the connection portion, the folded curved surface portion of the fluid pipe is a ring of the connection portion.
A fluid pipe connection for a fluid device, characterized in that it is crimped to an annular crimping portion by a curved concave curved surface portion or an annular tapered surface portion , and the vicinity of the free end portion of the folded curved surface portion is pressed against the small diameter annular portion. Related to the structure.

According to a second aspect of the present invention, in the first aspect, a wedge portion (45, 46) is provided at a tip of the mounting member, and the tip of the fluid pipe is folded back outward through the wedge portion. The present invention relates to a fluid pipe connection structure for a fluid device, which has a curved surface.

The invention of claim 3 relates to the fluid pipe connection structure of a fluid device according to claim 2, wherein the wedge portion comprises a wedge ring (45) .

According to a fourth aspect of the present invention, in the fluid device according to the first aspect , the annular concave curved surface portion is formed by an annular concave curved surface portion (36) having a radius smaller than a radius of the folded curved surface portion of the fluid pipe. This relates to a fluid pipe connection structure.

Further, the invention of claim 5 is the device body (6
0) , the inner peripheral threaded portion (63) formed concentrically with the main body flow path (62) and having a smaller diameter than the inner peripheral threaded portion formed inside the inner peripheral threaded portion. Annular part (65)
An annular crimping portion (70) formed inside the small-diameter annular portion and outside the main body flow path, and an inner portion of the annular crimping portion.
An annular concave curved surface portion (75) formed so as to project outward on the circumferential side
Alternatively, a connecting portion (6 of the device main body having an annular tapered surface portion )
1), and an attachment member (8 ) having an inner peripheral tubular portion (81) and an outer peripheral threaded portion (82) screwed with the inner peripheral threaded portion of the connecting portion.
0) and the tip portion (56) of the inner cylindrical portion of the mounting member.
And a fluid pipe (55) inserted so as to project, and a bulging portion (57) to the outer periphery in the vicinity of the tip of the fluid pipe by being press-fitted to the inner circumference of the projecting tip of the fluid pipe. An inner ring (90) to be formed, and when a fluid pipe fitted with the inner ring is screwed and fastened to the connecting portion by a mounting member, the tip of the inner ring is connected to the connecting portion.
A fluid pipe connection structure for a fluid device, characterized in that it is crimped to an annular crimp portion by an annular concave curved surface portion or an annular tapered surface portion , and the bulging portion of the fluid pipe is pressed against the small diameter annular portion. Pertain.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings. 1 is a sectional view of a fluid pipe connection structure showing an embodiment of the invention of claim 1, FIG. 2 is a sectional view showing a separated state of FIG. 1, FIG. 3 is a sectional view showing another example of a mounting member, FIG.
Is an enlarged sectional view showing an example of an annular concave curved surface portion, FIG. 5 is an enlarged sectional view showing a state without an annular concave curved surface portion, FIG. 6 is an enlarged sectional view showing an example of an annular tapered surface portion, and FIG. 7 is a curved surface. FIG. 8 is an enlarged cross-sectional view showing an example of a small-diameter annular portion, FIG. 8 is an enlarged cross-sectional view showing an example of a small-diameter annular portion having a tapered surface, and FIG. 9 is a cross-sectional view of a fluid pipe connection structure showing an embodiment of the invention of claim 5 . 10 is a sectional view showing the separated state of FIG. 9, and FIG. 11 is an enlarged sectional view showing the main part of FIG.

First, the invention of claim 1 will be described.
In the invention of claim 1, as shown in FIGS. 1 and 2, the connecting portion 21 of the device body 20, the mounting member 40, and the fluid pipe 5 are provided.
0 is a connection structure. In this specification, the fluid device refers to various piping equipment and valves used for fluid piping and control, and the fluid pipe is a pipe through which a fluid flows, and here, a flexible pipe that can be folded. Tubes such as plastic tubes with

The connecting portion 21 of the device body 20 is formed on the outer peripheral wall of a valve body such as a flow control valve, and has a large diameter concentric with the body flow passage 22 formed in the device body 20. An inner peripheral threaded portion 23 and an annular portion 25 formed inside the inner peripheral threaded portion 23 and having a diameter smaller than that of the inner peripheral threaded portion 23.
And inside the small-diameter annular portion 25 and in the main body flow path 22.
And an annular crimping portion 30 formed on the outer side of the.

The mounting member 40 includes an inner peripheral cylindrical portion 41 into which a fluid pipe 50 described below is inserted, and the device body 20 connecting portion 21.
Has an inner peripheral threaded portion 23 and an outer peripheral threaded portion 42 screwed together. Further, the fluid pipe 50 is, as shown in the figure, the mounting member 4
It is a folded-back curved surface portion 51 that is inserted into the inner peripheral cylindrical portion 41 of No. 0 and has its front end folded back outward. Incidentally, the folded-back curved surface portion 51 is easily formed by a known folding-back processing tool (flare processing machine or the like).

As defined in claims 2 and 3, the mounting member 40 has a wedge portion, particularly a wedge ring 45, at the tip thereof, and the tip of the fluid pipe 50 is outside through the wedge portion 45. Curved surface part 5
Setting the number to 1 is recommended in terms of processing work. Figure 3
The mounting member 40A is an example in which the wedge portion 46 is formed at the tip of the mounting member itself. In the figure, reference numeral 44 is O
It is a fitting groove of the ring.

In the structure of the present invention, when the mounting member 40 to which the fluid pipe 50 is mounted is screwed into the connecting portion 21, the folded curved surface portion 51 of the fluid pipe 50 is annularly crimped to the connecting portion 21. It is configured to be crimped to the portion 30 and to be pressed against the small-diameter annular portion 25 in the vicinity of the free end portion 52 of the folded curved surface portion 51.

FIG. 4 is an enlarged sectional view of the main part of FIG.
As is well understood from the figure, the folded curved surface portion 5 of the fluid pipe 50 is moved forward by screwing and fastening the mounting member 40.
A force in the cylinder direction as indicated by an arrow mark a in the figure is applied to 1.
At the same time, the vicinity of the free end portion 52 of the folded curved surface portion 51 is pressed against the small-diameter annular portion 25, so that a force b in the inner circumferential direction is applied to the folded curved surface portion 51. Due to the force a in the cylindrical direction applied to the folded curved surface portion 51 of the fluid pipe 50 and the force b in the inner circumferential direction, the fluid pipe 50 is strongly crimped by the annular crimp portion 30 of the device body to form a complete seal portion M.

By the way, the free end portion 5 of the folded curved surface portion 51 depends on the material of the fluid pipe 50 and how it is folded.
As shown in FIG. 5, the fluid pipe 50 may partially fall in the inner peripheral direction due to the force b applied to the inner peripheral direction 2. As a means to cope with such a case, according to claim 1
As defined as the invention of claim 1, the annular concave curved surface portion 35 protruding outward is formed on the inner peripheral side of the annular crimp portion 30 of the connecting portion 21.
To be done . The annular concave curved surface portion 35 can prevent the fluid pipe 50 from partially falling in the inner circumferential direction by the inner circumferential force b, and further, the circumferential force b is transmitted to the cylindrical force a. And a stronger crimping force can be obtained.

[0019] The annular concave surface portion 35, as defined as an invention of claim 4, the annular concave surface portion of smaller radius r2 than the radius r1 of the folded curved portion 51 of the fluid tube 50
If formed by 36 , the folded back curved surface portion 51 of the fluid pipe 50 makes point contact due to the force a in the cylinder direction, and the flexibility of the folded back curved surface portion 51 causes a strong close contact to enhance the sealing performance.

Further, as shown in FIG. 6 and defined as the invention of claim 1 , instead of the annular concave curved surface portion 35, an annular taper surface portion 3 protruding outward on the inner peripheral side of the annular crimp portion 30.
7 may be formed. In the same manner as described above, the force b in the circumferential direction can be transmitted to the force a in the cylinder direction to obtain a stronger crimping force.

Further, regarding the small-diameter annular portion, in the above-mentioned embodiment, an example of the small-diameter annular portion 25 by the step portion is shown. However, as shown in FIGS. in addition to the stepped portion 25 may be a small diameter annular portion 27 by a tapered surface such as a small diameter annular portion 26, or 8 by curved as shown in FIG. 7. Also in these cases, as described above,
The force b in the circumferential direction can be transmitted to the force a in the cylinder direction to obtain a stronger crimping force.

Next, the invention of claim 5 will be described.
The invention of claim 5 is, as shown in FIGS. 9 and 10,
This is a connection structure including a connection portion 61 of the device body 60, a mounting member 80, a fluid pipe 55, and an inner ring 90.

Similar to the previous example, the connection portion 61 of the device main body 60 has an inner peripheral threaded portion 63 formed in a large diameter concentric with the main body flow passage 62 formed in the device main body 60, and the inner portion. An annular portion 65 formed inside the peripheral threaded portion 63 and having a diameter smaller than that of the inner peripheral threaded portion 63, and an annular crimping portion 70 formed inside the small diameter annular portion 65 and outside the main body flow passage 62. Have.

Similarly, the mounting member 80 also has an inner cylindrical portion 81 into which the fluid pipe 55 is inserted and a connecting portion 61 of the device body 60.
The inner peripheral threaded portion 63 and the outer peripheral threaded portion 82 are screwed together. Further, the fluid pipe 55 is inserted into the inner peripheral tubular portion 81 of the mounting member 80 so that the tip portion 56 thereof projects.

According to the fifth aspect of the present invention, the inner ring 90 is press fitted onto the tip portion 56 of the fluid pipe 55.
The inner ring 90 is press-fitted to the inner peripheral portion of the protruding tip portion 56 of the fluid pipe 55 to form a bulged portion 57 to the outer periphery in the vicinity of the tip portion 56 of the fluid pipe 55.
As is clear from the enlarged view of FIG. 11, the fluid pipe 55 fitted with the inner ring 90 is attached to the mounting member 80.
When the inner ring 90 is screwed and fastened to the connection portion 61 by the above, the tip portion 95 of the inner ring 90 is crimped to the annular crimp portion 70 of the connection portion 61, and the bulging portion 57 of the fluid pipe 55 is the small diameter annular portion 65. It is configured to be pressed against.

Also in the structure of the present invention, the tip of the inner ring 90 press-fitted to the tip 56 of the fluid pipe 55 by the forward movement of the mounting member 80 by screwing and tightening, similarly to the invention of claim 1 described above. A force in the cylinder direction as indicated by an arrow mark c in the drawing is applied to the portion 95. At the same time, the bulging portion 57 of the fluid pipe 55
Is pressed against the small-diameter annular portion 65 and a force d in the inner peripheral direction is applied. The inner ring 90 and the fluid pipe 55 are firmly coupled by the force c in the cylindrical direction applied to the tip portion 95 of the inner ring 90 and the force d in the inner circumferential direction applied to the bulging portion 57 of the fluid pipe 55, and The tip portion 95 of the inner ring 90 is strongly crimped to the annular crimp portion 70 of the device body to form a complete seal portion M1.

The inner ring 90 of the embodiment has a tip portion 95.
Is formed into a curved surface, but it is not always necessary to have such a curved surface. Any structure may be used as long as it is crimped to the annular crimping portion 70 of the device body by the forward movement of the mounting member 80 by screwing. Reference numeral 91 in FIG. 11 is an insertion groove into which the end edge 56a of the tip portion 56 of the fluid pipe 55 is inserted, and 92 is an annular protrusion for forming the bulging portion 57 near the tip portion 56 of the fluid pipe 55.

When the tip portion 95 of the inner ring 90 is formed into a curved surface or a tapered surface, the device body 60
An annular concave curved surface portion 75 or an annular tapered surface portion (not shown) protruding outward is provided on the inner peripheral side of the annular crimp portion 70. The annular concave curved surface portion 75 or the annular tapered surface portion is formed according to claim 1.
In the same manner as described with respect to the invention of FIG.
Produces a stronger crimping force. Also, the small-diameter annular portion 65 may have a curved surface shape or a tapered surface shape (not shown) in addition to the step portion shown in the drawing, as described in the invention of claim 1.

[0029]

As shown and described above, the fluid pipe connection structure for a fluid device according to the present invention has a structure in which the fluid pipe is connected at the connection portion in the device body, and therefore the device body is not used. By using the meat portion, the connection distance is shortened, the space can be effectively used, and the connection portion does not project to the outside, which is safe. In particular, in the structure of the present invention, since a cylindrical force and an inner peripheral force are applied to the fluid pipe side to be connected, the pressure is strongly crimped to the annular crimping portion on the connecting portion side of the device main body, so that a complete seal portion is provided. A high sealing function can be obtained reliably and stably.

Further, in the structure of the present invention, it is sufficient to form the folded curved surface portion at the tip of the fluid pipe (the invention of claim 1) or press fit the inner ring to the tip of the fluid pipe (the invention of claim 5 ). , Regardless of the diameter of the fluid pipe, it can be easily and easily installed with a small diameter or a large diameter.

Further, according to the structure of the present invention, in addition to high sealing performance, no liquid pool is formed at the connecting portion between the connecting portion of the main body of the apparatus and the fluid pipe. Can also be used very advantageously.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fluid pipe connection structure showing an embodiment of the invention of claim 1.

FIG. 2 is a cross-sectional view showing the separated state of FIG.

FIG. 3 is a cross-sectional view showing another example of a mounting member.

FIG. 4 is an enlarged sectional view showing an example of an annular concave curved surface portion.

FIG. 5 is an enlarged cross-sectional view showing a state without an annular concave curved surface portion.

FIG. 6 is an enlarged sectional view showing an example of an annular tapered surface portion.

FIG. 7 is an enlarged cross-sectional view showing an example of a small-diameter annular portion having a curved surface.

FIG. 8 is an enlarged cross-sectional view showing an example of a small-diameter annular portion having a tapered surface.

FIG. 9 is a sectional view of a fluid pipe connection structure showing an embodiment of the invention of claim 5 ;

10 is a cross-sectional view showing the separated state of FIG.

11 is an enlarged cross-sectional view showing the main part of FIG.

FIG. 12 is a cross-sectional view showing an example of a conventional fluid pipe connection structure.

FIG. 13 is a sectional view showing another example of the conventional fluid pipe connection structure.

[Explanation of symbols]

20 device body 21 Connection 22 Main body flow path 23 Inner circumference screw part 25 Small diameter annular part (step) 26 Small diameter annular part (curved surface) 27 Small diameter annular part (tapered surface) 30 annular crimping part 35 annular concave curved surface 36 Small diameter annular concave curved surface 37 Annular taper surface 40 Mounting member 41 Inner peripheral cylinder 42 External thread 45 wedge part (wedge ring) 46 wedge part 50 fluid pipe 51 Folded curved surface 55 Fluid pipe 56 Tip 57 bulge 60 device body 61 Connection 62 Main body flow path 63 Inner thread 65 Small diameter annular part 70 Annular crimping part 80 Mounting member 81 Inner peripheral cylinder 82 Peripheral thread 90 Inner ring 95 Tip

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-229089 (JP, A) JP-A-9-257172 (JP, A) Actual development Sho-56-65285 (JP, U) Utility model registration 2549943 ( JP, Y2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16L 19/04 F16L 47/04

Claims (5)

(57) [Claims] 1. A main body flow path formed in an equipment main body (20)
Inner peripheral threaded portion (2 ) formed to have a large diameter concentric with (22)
3) , an annular part (25) formed inside the inner peripheral threaded part and having a diameter smaller than that of the inner peripheral threaded part, and an annular part formed inside the small diameter annular part and outside the main body flow path. Crimp part
(30) and projecting outward on the inner peripheral side of the annular crimping portion.
Formed annular concave curved surface portion (35) or annular tapered surface portion
An attachment member (40) having a connection part (21) of the device body having (37) , an inner peripheral tubular part (41) and an outer peripheral threaded part (42) screwed with the inner peripheral threaded part of the connection part. And a fluid pipe (50) having a folded back curved surface portion (51) which is inserted into the inner peripheral tubular portion of the mounting member and has its tip folded back outward.
And when the mounting member to which the fluid pipe is mounted is screwed and tightened to the connecting portion, the folded curved surface portion of the fluid pipe becomes the annular crimping portion by the annular concave curved surface portion or the annular tapered surface portion of the connecting portion. A fluid pipe connection structure for a fluid device, characterized in that it is crimped and the vicinity of a free end of the folded curved surface portion is pressed against the small diameter annular portion. 2. The wedge member (45, 46) according to claim 1, further comprising a wedge portion (45, 46) at a tip end of the mounting member, the tip end of the fluid pipe being turned outward through the wedge portion to form a folded back curved surface portion. Fluid pipe connection structure for existing fluid equipment. 3. The fluid pipe connection structure according to claim 2, wherein the wedge portion is a wedge ring (45) . 4. The radius of the annular concave curved surface portion according to claim 1 , which is smaller than the radius of the folded curved surface portion of the fluid pipe .
A fluid pipe connection structure for a fluid device, which is formed by an annular concave curved surface portion (36) . 5. A main body flow path formed in an equipment main body (60)
An inner peripheral threaded portion (6 ) formed in a large diameter concentric with (62)
3) , an annular part (65) formed inside the inner peripheral threaded part and having a diameter smaller than that of the inner peripheral threaded part, and an annular part formed inside the small diameter annular part and outside the main body flow path. Crimp part
(70) and projecting outward on the inner peripheral side of the annular crimping portion.
A connection part (61) of the device body having the formed annular concave curved surface part (75) or an annular tapered surface part, and an outer peripheral threaded part screwed with the inner peripheral tubular part (81) and the inner peripheral threaded part of the connection part. A mounting member (80) having (82) , a fluid pipe (55) inserted into the inner peripheral tubular portion of the mounting member such that a tip portion (56) thereof projects, and a projecting tip of the fluid pipe. An inner ring (90) press-fitted to the inner peripheral portion of the portion to form a bulged portion (57) to the outer periphery in the vicinity of the tip of the fluid pipe, and the fluid pipe fitted with the inner ring is attached. When the member is screwed and tightened to the connection portion, the tip end portion of the inner ring has an annular concave curved surface portion or an annular tapered surface of the connection portion.
Is crimped to the annular crimping portion by parts, and the fluid pipe connection structure of a fluid device in which the bulging portion of the fluid pipe, characterized by being configured to be pressed against the small-diameter annular portion.