JPH0333591A - Tube fitting - Google Patents

Abstract

PURPOSE:To further shorten the part for a coupling so as to obtain a low-priced tube fitting by providing a first tubular member with a large diameter hole part, a second tubular member provided with a shank comprising an axial hole, a tightening means for tightening a hose, a spring body for supporting a valve body and a valve switching means. CONSTITUTION:A tube fitting 51 is provided with the coupling main body 2 of a first tubular member comprising a small diameter hole part 22a and a large diameter hole part 22b, and the core member 24 of a second tubular member comprising a mealing member and an axial hole 24b forming a flow passage 52. Between the large diameter hole part 22b and a shank 24c, there are also provided with a tightening means 25 for tightening a hose 31 inserted into the shank 24c, a coil spring 56, a spring body, for supporting the axial hole 24b and a valve body 55, and a valve switching means 53. When the fluid force becomes larger than the force of the coil spring 56 for separating the valve body 55 from an opening, the valve body 55 is pressed to the opening to cut off the flow passage. The valve body 55 can be thus made a rectangular coupling capable of cutting off the flow passage.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pipe joint, for example, a pipe joint for a hose used in piping for various fluids.

(Prior Art) Generally, when connecting fluid equipment and piping using a pipe joint to which a hose is connected, a check valve or a check valve having a flow rate adjustment function is sometimes used in combination.

There are two types of pipe joints for connecting hoses: swage type and non-swage type. Among the non-swage type, there is a so-called one-touch pipe joint that is fastened when a hose is inserted.

An example of a conventional caulking type pipe joint is shown in FIG. 10. In FIG. 10, 1 is a pipe joint, and the pipe joint 1 has a core metal fitting 2 and a fastener 3 attached to the core metal fitting 2. When connecting a hose 8 consisting of an inner pipe 5, a reinforcing layer 6, and an outer sheath 7 to a pipe joint 1, the hose 8 is crimped by a crimping machine at a factory such as a hose manufacturer, so a dedicated crimping machine is required. The problem is that it is necessary.

Further, as a non-crimped type, there is one shown in FIG. 11, for example. In FIG. 11, reference numeral 11 denotes a so-called reusable metal fitting as a pipe joint. It has a metal fitting 13. When fastening the hose 8, first the fastener 13 is attached to the hose 8 using a high speed steel or the like, and then the core 12a of the core metal fitting 12 is screwed into the inside of the hose 8 using a spanner or the like. For this reason, tightening fittings such as high speed steel and spanners are required when tightening, and
There are problems in that it takes time to fasten and the work efficiency is low.

In addition, as a one-piece pipe joint, for example, as shown in FIG.
There are some proposals such as in Publication No.-4796. The one-touch fitting 15 shown in FIG. 12 includes a tubular fitting body 16, an O-ring 18 as a seal portion side that circumscribes a single-layer tube 17 inserted into the fitting body 16, and a tube 17.
It has a cha-7ri 19 that bites on the outside. When a hose with a composite structure is connected to these known one-piece pipe joints, the reinforcing layer of the hose is a layer of braided fibers with voids, so the fluid inside the hose enters the reinforcing layer from the end of the hose. This may cause problems such as blistering of the hose or fluid leakage. Further, the tube 17 is gripped by the chuck 19 at a tip portion having almost no length in the axial direction by a sharp claw-like portion 19a on the outside of the tube 17. For this reason, such a one-touch fitting 15 causes problems such as tearing the outer jacket of the hose or disconnection of the hose, and cannot be applied to a hose with a composite structure.
It could not withstand use at high pressures exceeding .

Therefore, the present inventors have discovered that a hose with a composite structure used for high-pressure or low-pressure fluids can be fastened in a single snap without using any crimping equipment or jigs, and that In Japanese Patent Application No. 62-246770, we proposed something as shown in Fig. 13, which can be easily fastened by simply inserting the hose into the pipe joint without any problems. This will be explained below.

In FIG. 13, 21 is a pipe joint, and the pipe joint 21 is connected to a small-diameter hole portion 22a having a small-diameter hole in the axial direction and a large-diameter hole portion 22b having a larger hole diameter than the small-diameter hole portion 22a. A joint body 22 as a first cylindrical member having
and a shaft part 24c that has a sliding part 24a that slides in the axial direction within the large diameter hole 22b of the joint body 22 and a shaft hole 24b that is continuous with the sliding part 2/I2 and communicates with the small diameter hole 22a. A core member 24 as a second cylindrical member is provided. A sleeve 26 is provided within the large diameter hole 22b of the joint body 22 on the side of the opening 22C that is far from the small diameter hole 22a. The sleeve 26 has its outer circumferential surface 26a in contact with the inner wall 22d of the large diameter hole 22b of the joint body 22, and has a stepped portion 22e and an opening 22C.
It is fixed by a retaining ring 27 as a retaining member that engages with a nearby circumferential groove 22f.

The inner circumferential surface of the sleeve 26 has an inclined surface portion 26c whose diameter decreases toward the axial opening 22C. The cylindrical collet 28 is made of steel and has an outer peripheral surface 28a that contacts the inclined surface 26C of the sleeve 26 within the large diameter hole 22b of the joint body 22. The inner surface of the collet 28 has a plurality of concave and convex ring-shaped circumferences. 28b is provided in the sleeve 26, and the diameter can be expanded or contracted when the core 28 slides in the axial direction within the sleeve 26. As shown in Fig. 15.16, the collet 28 has
A plurality of axial slits 28c are provided so that the shape can be maintained even under the load of compression and crimping of the hose, which will be described later, and the diameter can be reduced reliably. 2
Reference numeral 9 denotes an O-ring, and the O-ring 29 is provided on the outer periphery of the flange portion 24a of the core member 24, and seals the joint body 22 and the flange portion 24a of the core member JrA'24. 30
is an O-ring, and the O-ring 30 is attached to the shaft portion 2 of the core member 24.
It is provided on the outer periphery of the collet 4C at a position facing the circumferential groove 28b of the collet 28, and is in close contact with the inner tube of the inserted hose to seal between the inner tube and the shaft portion 24C.

As shown in FIG. 14(a), the end 31a of the hose 31 extends from the large diameter hole 22b side of the joint body 22 to the small diameter hole 22.
It is pushed toward the a side between the outer side of the shaft portion 24C of the core member 24 and the collet 28 until it comes into contact with the flange portion 24a. When internal pressure is applied inside the pipe joint 21, the core member 24 is moved in the axial direction to approach the sleeve 26 due to the internal pressure inside the small diameter hole 22a, and the collet 28 engages with the core member 24, causing the collet 28 to engage with the core member 24. When the collet 28 moves together, the outer circumferential surface 28a of the collet 28 contacts the inclined surface portion 26c of the sleeve 26 within the sleeve 26 and slides in the axial direction, reducing the diameter. Then, the hose 3 is connected to the collet 28 and the shaft portion 24C.
1 end 31a is tightened. That is, the hose 31 is tightened only by the internal pressure within the small diameter hole 22a of the pipe joint 21, and is tightened to the pipe joint 21 in a one-tight manner. Therefore, the tightening work can be performed extremely easily without requiring any tightening equipment or jigs.

When such a pipe joint 21 is used together with a check valve or a check valve having a flow rate adjustment function, and is connected to a fluid device and piped, a conventional pipe joint 21 as shown in FIG. 17 is used, for example. There is something.

In FIG. 17, reference numeral 41 is a check valve having a flow rate adjustment function, and the pipe joint 21 is connected to the hose 31 with the hose 31 tightened.
These are the pipe joints shown in Figure 4, each of which has an independent structure. The pipe joint 21 is connected to a check valve 41 by a screw connection, and the check valve 41 is further connected to a fluid device 43 by a screw connection. In the pipe joint 21 and the hose 31, the same components as those shown in FIGS. 13 and 14 are given the same reference numerals.

The check valve 41 has a cylindrical body 46 that forms a flow path 45 through which fluid passes.
and a cylindrical valve structure 47 screwed and housed within the cylindrical body 46. The valve structure 47 includes a cylindrical valve seat 48 and a valve body 50 that is biased away from the opening 48a of the valve seat 48 by a helical spring 49 housed within the valve seat 48.

The valve body 50 is capable of sliding within the valve seat 48 against the urging force of the spring 49, and is also capable of opening and closing the flow path 45 by engaging with the opening 48a of the valve seat 48.

When the fluid flows in the opposite direction in the flow path 45 from the check valve 41 side to the pipe joint 21 side, when the flow rate is small, the fluid flows freely because the valve body 50 is separated from the opening of the valve seat 48. As the flow rate increases, the fluid force acting on the valve body 50 causes the spring 49 to
When the urging force exceeds , the valve body 50 is moved and the opening 48a is closed.
The flow path 45 is closed and blocked, and flow in the opposite direction (reverse flow) is prohibited.

(Problem to be Solved by the Invention) However, in the case where the check valve 41 and the pipe fitting 21 are connected to each other by screw connection, the check valve 41 and the pipe fitting 21 have an independent structure. Therefore, as the number of points where these are connected increases, the length of the joint becomes longer. For this reason, there are disadvantages in that the time taken to construct the piping is longer and the number of locations from which fluid leaks increases. Further, there is a problem that the pressure loss during piping becomes large, which hinders free piping design.

In addition, the valve body 50 is structured to slide inside the cylindrical body 46, and in order to slide smoothly, it is necessary to improve the finishing accuracy of the sliding surface 50a, and special processing such as polishing or honing is required. It becomes necessary. Therefore, there is also the problem that it becomes very expensive.

Therefore, the present invention provides a check valve or non-return valve with a flow rate adjustment function built into the hose pipe joint, thereby shortening the joint between the hose and the equipment, facilitating piping design, and furthermore, By providing a plate-shaped spring body on the stop valve,
The purpose is to provide a pipe joint that can make the joint part shorter and at a lower cost.

(Means for Solving the Problems) A pipe joint according to claim 1 of the present invention includes a first cylindrical member having a small-diameter hole and a large-diameter hole connected to the small-diameter hole and having a larger hole diameter than the small-diameter hole; A sliding part that is slidable in the axial direction within the large-diameter hole of the one-cylindrical member and is equipped with a sealing member, and a shaft part that has a shaft hole that connects to the sliding part and communicates with the small-diameter hole to form a flow path. a second cylindrical member, a tightening means interposed between the large diameter hole and the shaft, and tightening a hose inserted outside the shaft from the large diameter hole toward the small diameter hole; a valve opening/closing means attached to the sliding portion, comprising a valve body capable of opening and closing an opening on the small diameter hole side of the shaft hole, and a spring body supporting the valve body at a distance from the opening toward the small diameter hole side; , which presses the valve body against the opening when the fluid force acting on the valve body due to the fluid flowing from the small diameter hole side to the large diameter hole side exceeds the biasing force of the spring body that separates the valve body from the opening. It is characterized by blocking the flow path.

The pipe joint according to claim 2 further includes: a first cylindrical member having a small diameter hole and a large diameter hole that is connected to the small diameter hole and has a larger diameter than the small diameter hole; a second cylindrical member comprising a sliding part that is slidable in a direction and has a sealing member; a shaft part that is continuous with the sliding part and has a shaft hole that communicates with the small diameter hole; and the large diameter hole and the shaft part. a tightening means interposed between the two and tightening the hose inserted outside the shaft from the large-diameter hole side toward the small-diameter hole side; and a valve capable of opening and closing the opening on the small-diameter hole side of the shaft hole. a spring body that urges and supports the body from the small diameter hole side to the large diameter hole side so as to normally close the opening, and a valve opening/closing means attached to the sliding part. It is characterized by

(Function) In the pipe joint according to claim 1 of the present invention, the valve opening/closing means is attached to the sliding part of the second cylindrical member, and the valve body of the valve opening/closing means is fitted into the spring body on the small diameter hole side of the shaft hole. Since it is supported at a distance from the opening to the small diameter hole side, the valve body opens the flow path, and when the flow rate through the shaft hole is small, backflow from the small diameter hole side to the large diameter hole side is also possible. 2. Positive flow from the large diameter hole side to the small diameter hole side also passes through both.

When the flow rate of the backflow increases and the fluid force acting on the valve body reaches the biasing force plate of the spring body that separates the valve body from the opening, the valve body moves and closes the opening, and then the fluid on the small diameter hole side The pressure increases and blocks the backflow flow. That is, it acts as a check valve that has a flow rate adjustment function that allows fluid to flow freely up to a certain flow rate. Furthermore, since this check valve is built into the pipe joint, no joint is required, and the length of the pipe joint can be significantly shortened.

Further, in the pipe joint according to claim 2 of the present invention, a valve opening/closing means is attached to the sliding part of the second cylindrical member, and the valve opening/closing means has a valve body capable of opening and closing the opening on the small diameter hole side of the shaft hole. The valve body is normally biased by a spring body from the small diameter hole side to the large diameter hole side so that the valve body closes the opening, so backflow from the small diameter hole side to the large diameter hole side is blocked. be done. On the other hand, the normal flow from the large-diameter hole side to the small-diameter hole side opens when the fluid force applied to the valve body exceeds the biasing force of the spring body. In other words, it acts as a check valve. Furthermore, since the check valve is built into the pipe joint, no joint is required, and the length of the pipe joint can be significantly shortened.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1.2 is a diagram showing a first embodiment of a pipe joint according to claim 1 of the present invention.

First, the configuration will be explained. In Figure 1, the 17th
Components that are the same as those of the conventional pipe joint shown in the figure are given the same reference numerals, and only the necessary parts will be explained.

51 is a pipe joint, and the pipe joint 51 includes a joint main body 22 as a first cylindrical member, and a second shaft hole 24b that slides inside the large diameter hole 22b of the joint main body 22 and forms a flow path 52. The core member 24 is provided as a cylindrical member. The sliding portion 24a of the core member 24 is provided with a hollow hole 24d that communicates with the shaft hole 24b and is larger than the inner diameter of the shaft hole 24b, and a valve opening/closing means 53 is attached to the inside hole 24d by a retaining ring 57, which will be described later. . 25 is a tightening means, and the tightening means 25 is a sleeve 2
6, Koresoto 28, retaining ring 27 and O-ring 29
．． 30, and is interposed between the large diameter hole portion 22b and the four shaft portions 24c. The tightening means 25 extends from the shaft portion 24 from the large diameter hole 22b side toward the small diameter hole 22a side.
The hose 31 inserted outside C is tightened.

The valve opening/closing means 53 includes a cylindrical valve body 55 spaced apart from the opening 24e on the small diameter hole 22a side of the shaft hole 24b toward the small diameter hole 22a in the axial direction, and a spring that biases the valve body 55 toward the small diameter hole 22a. It has a coil spring 56 which is a body. The valve body 55 can move in the axial direction to open and close the opening 24e.

Reference numeral 57 denotes a retaining ring, and the retaining ring 57 attaches the valve body 55 within the hollow hole 24d. The fin opening/closing means 53 is composed of a valve body 55, a spring 56, and a retaining ring 57.

Next, the effect will be explained.

Since the valve body 55 of the valve opening/closing means 53 is separated from the opening 24e toward the small diameter hole 22a by the spring 56, the valve body 55 opens the flow path 52. When the flow rate flowing through the shaft hole 24b is small, the fluid flows backward from the small diameter hole 22a side to the large diameter hole 22b side (arrow A).
A normal flow (arrow B) from the b side to the small diameter hole 22a side also passes through. When the flow rate of the backflow increases and the fluid force acting on the valve body 55 exceeds the biasing force of the spring 56 that separates the valve body 55 from the opening 24e, the second
As shown in the figure, the valve body 55 moves toward the large-diameter hole 22b and pushes the opening 24e to close it, thereby blocking the flow of reverse flow. That is, the pipe joint 51 is a check valve that has a so-called flow rate adjustment function that allows both reverse flow and forward flow to flow up to a certain flow rate, and that shuts off reverse flow when the flow rate increases. Pipe fitting 51
The valve opening/closing means 53 is attached with a stop ring 57 so as to be housed within the sliding portion 24a of the core member 24, and is built into the pipe joint 51. Therefore, the conventional check valve 41 and pipe joint 21
Compared to those with an independent structure, there is no screw connection,
The axial length is significantly short and piping design is easy.

Next, a second embodiment of claim 1 of the present invention will be described.

3 to 6 are diagrams showing a second embodiment of the pipe joint.

In FIG. 3, 61 is a pipe joint, and the pipe joint 61 is the same as the pipe joint 51 of the first embodiment, but the core member 24 is composed of a flange-shaped sliding part 24a and a 6-shaft part 24C connected to the sliding part 24a. In this case, the valve opening/closing means 63 is a plate-shaped valve opening/closing means 63 shown in FIG. 5.6. The valve opening/closing means 63 has a conical valve body 64 and four leg-shaped spring bodies 65 that are connected to the valve body 64 and extend in the circumferential direction of the valve body 64. 66 is a retaining ring; the retaining ring 66
connects the outer end of the spring body 65, and connects the sliding portion 24a.
installed on. The valve body 64, the spring body 65, and the retaining ring 66 are integrally formed.

Everything other than the above is the same as the first embodiment.

In the second embodiment, the valve opening/closing means 63 is plate-shaped and is attached to the sliding portion 24a and built in the pipe joint 61, so that the length of the pipe joint 61 in the axial direction is significantly shortened. In addition, the valve body 64, the spring body 65, and the retaining ring 6
6 is integrally formed, manufacturing is easy and inexpensive. Therefore, the pipe fitting 61 is similar to the pipe fitting 51 shown in FIG.
The length is much shorter and the price is lower.

Next, an embodiment of a pipe joint according to claim 2 of the present invention will be described.

Figures 7 to 9 are views showing an embodiment of the pipe joint according to claim 2 of the present invention, and the same components as the second embodiment of claim 1 shown in Figures 3 to 6 are the same. Add a sign.

71 is a pipe joint, and the pipe joint 71 has a cylindrical extension part 2 extending the sliding part 24a of the core member 24 toward the small diameter hole part 22a side.
4f and a valve opening/closing means 73 is attached. As shown in FIG. 8.9, the valve opening/closing means 73 includes a conical valve body 74 and leg-shaped legs that are connected to the valve body 74, extend in the circumferential direction of the valve body 74, and support the valve body 74. It has four spring bodies 75. 76 is a retaining ring; the retaining ring 76
connects the outer end of the spring body 75, and connects the sliding portion 24a.
It is attached to the extension part 24f of.

The valve body 74 has an opening 24e on the small diameter hole 22a side of the shaft hole 24b.
The spring body 75 can be opened and closed, and normally extends from the small diameter hole 22a side to the large diameter hole 22b side so as to close the opening 24e.
is energized by. Everything other than the above is the same as the second embodiment of claim 1.

The pipe joint 71 is moved from the small diameter hole 22a side to the large diameter hole 2 by a spring body 75 so that the valve body 74 normally closes the opening 24e.
2b side, the reverse flow (arrow A) from the small diameter hole 8 22a side to the large diameter hole 22b side is blocked. - On the other hand, the normal flow (arrow B) from the large diameter hole 22b side to the small diameter hole 22a side is caused by the fluid flowing through the valve body 7.
When the fluid force applied to 4 becomes greater than the biasing force of the spring body 75, the valve body 74 separates from the opening 24e, and the flow path 52 opens and flows.

In the pipe joint 71, the valve opening/closing means 73 is housed in the joint body 22, and since the valve opening/closing means 73 is plate-shaped and has a short axial length, the pipe joint 71 has a significantly short axial length. Become. Further, the valve opening/closing means 73 is easy to manufacture and inexpensive because the valve body 74, the spring body 75, and the retaining ring 76 are integrally formed. Therefore, the pipe fitting 71 is significantly cheaper than conventional pipe fittings.

(Effects) As explained above, according to the present invention, by incorporating the check valve having the flow N adjustment function according to claim 1 or the check valve according to claim 2 into the pipe joint of the hose, respectively. , the pipe joint between the hose and the equipment can be shortened to facilitate piping design. Furthermore, by using plate-shaped spring bodies 9 in these check valves, the pipe joints can be further shortened and made cheaper.

[Brief explanation of drawings]

Figure 1.2 shows the first claim of claim 1 of the pipe fitting for non-explosion.
FIG. 1 is a longitudinal sectional view of the embodiment, and FIG. 2 is a longitudinal sectional view of the embodiment. 3 to 6 are diagrams showing a second embodiment of the pipe joint according to claim 1 of the present invention, in which FIG. 3 is a longitudinal section thereof, and FIG. 4 is a longitudinal sectional view showing its operation.
FIG. 5 is a plan view of the main part, and FIG. 6 is a sectional view of the main part. 7 to 9 are diagrams showing an embodiment of the pipe joint according to claim 2 of the present invention, in which FIG. 7 is a longitudinal sectional view thereof, FIG. 8 is a plan view of the main part thereof, and FIG. It is a sectional view of the main part. 1st
Figures 0 to 17 are diagrams showing conventional pipe joints, and Figures 10 to 1
Figure 3, Figure 14 (a), Figure 14 (b), and Figure 17 are respective longitudinal cross-sectional views, Figure 15 is a plan view of Kolesotho in Figure 13, and Figure 16 is a view of Kole 7 in Figure 13. ) is a cross-sectional view of the subassembly. 22... Kumite body, 24... Core member, 0 25... Tightening means, 31... Hose, 51.61.71...・・Pipe fitting, 43・・・・
・Fluid equipment, 45.52...Flow path, 50.55.64.74...Valve body, 53.63
．． 73...Valve opening/closing means. Agent: Patent Attorney Aukou JP-A-3-33591 (10)

Claims (2)

[Claims] (1) A first cylindrical member having a small-diameter hole and a large-diameter hole that is connected to the small-diameter hole and has a larger hole diameter than the small-diameter hole, and a sealing member that is slidable in the axial direction within the large-diameter hole of the first cylindrical member. between the large diameter hole and the shaft; An interposed tightening means for tightening the hose inserted outside the shaft portion from the large diameter hole side toward the small diameter hole side, and a valve body and valve that can open and close the opening on the small diameter hole side of the shaft hole. a spring body that supports the body at a distance from the opening toward the small-diameter hole, and a valve opening/closing means attached to the sliding portion; A pipe joint characterized in that when the fluid force acting on the valve body exceeds the biasing force of a spring body that separates the valve body from the opening, the valve body is pressed against the opening and the flow path is cut off. (2) a first cylindrical member having a small-diameter hole and a large-diameter hole that is connected to the small-diameter hole and has a larger hole diameter than the small-diameter hole; and a sealing member that is slidable in the axial direction within the large-diameter hole of the first cylindrical member. a second cylindrical member having a sliding part having a sliding part and a shaft part having a shaft hole connected to the sliding part and communicating with the small diameter hole part, and a large diameter part interposed between the large diameter hole part and the shaft part A tightening means for tightening the hose inserted on the outside of the shaft from the hole side toward the small diameter hole side, and a valve body that can open and close the opening on the small diameter hole side of the shaft hole so as to normally close the opening. A pipe joint comprising: a valve opening/closing means attached to the sliding portion, the spring body urging and supporting the valve from the small diameter hole side toward the large diameter hole side.