Piping

Abstract

To provide piping which can eliminate the occurrence of the loosening of fixed piping caused by co-rotation when assembling the piping to blocks, and is high in maintenance performance.SOLUTION: In piping 1 composed of at least two pieces of piping having flow passages 41 therein, and connecting blocks 4, 4 having release ends 4a of the flow passages 41 on their surfaces, an outward flange 12 is formed at the other end side of piping 1A, a circular disc-shaped gasket 13 is interposed between abutment end faces, a male screw 20 is formed at a peripheral face into which the piping is inserted, and a male screw member 2 for making the outward flange 12 abut thereon is arranged. The outward flange 12 having the same shape as that of the other end side of the piping 1A is formed at the other end side of piping 1B, a female screw 30 screwed to the male screw 20 which is inserted into the piping is formed at an internal peripheral face, and a bag nut member 3 in which an inward flange 31 engaged with the outward flange 12 is formed is arranged.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to piping that communicates between blocks, and more particularly to piping between blocks that has a joint function. [Background technology]

[0002] 2. Description of the Related Art Pipes that connect between roughly cubic blocks with internal flow paths, each block having open ends of the internal flow paths on at least two points on its surface, are widely used in a variety of fields.

[0003] For example, in the block 4 and piping 100 shown in Figure 7, a tapered seal portion 40 and a female thread portion 43 are formed at the open end of the internal flow path 41, and the tapered surface 10 is pressed and fixed to the tip of the piping to prevent the fluid flowing through the block 4 and the piping 100 from leaking to the outside.

[0004] Generally, such a structure is called a cone thread joint, and a tapered surface 10 and a male screw 11 are formed at the tip of the pipe 100. A fixing member 14 having a through hole 14c slightly larger in diameter than the pipe diameter and a male screw portion 14a and a hexagonal portion 14b that engages with a tool on the circumferential surface thereof, and a stopper 15 that screws into the male screw 11 of the pipe 100 are attached to the tip of the pipe 100, and as shown in the figure, the tapered surface 10 at the tip of the pipe is pressed against the tapered seal portion 40 of the block 4, the male screw 14a of the fixing member 14 is screwed into the female screw portion 43 formed on the inner circumferential surface of the mounting space 42 on the open end side of the tapered seal portion 40 of the block 4, and the tip of the fixing member 14 is screwed in until it abuts against the stopper 15, whereby the tapered surface 10 abuts against the tapered seal portion 40 to be sealed.

[0005] Such connections using blocks and piping are used, for example, in the hydrogen station unit described in Patent Document 1. In the unit described in Patent Document 1, a space is provided for pulling out the piping. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2019-203573 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, when cone thread joints are used to connect the blocks and the pipes, as shown in Figure 7, after the pipes are fixed to one block, tightening the nut that fixes the other block causes the pipes to rotate together, resulting in the pipes becoming loose from the block to which they are fixed. In addition, when it is necessary to remove the pipes from the blocks for maintenance after construction, it is necessary to move the block to which the pipes are attached by the pipe removal allowance H shown in the figure. Furthermore, if both blocks to which the pipes are fixed are constrained after construction, work must be done to release the constraints of one of the blocks or to cut the pipes, resulting in a problem of the maintenance work taking a lot of time.

[0008] The present invention has been made in consideration of the above points, and aims to provide piping that is easy to maintain and that prevents the piping from loosening due to co-rotation when attaching the piping to a block. [Means for solving the problem]

[0009] The piping according to the present invention for solving the above problems comprises: A pipe consisting of at least two pieces of pipe connecting a block having a flow path inside and an open end of the flow path on the surface thereof, one end side has a tapered surface that abuts against a tapered seal portion formed at an open end of the block, and a male screw portion formed on the other end side of the tapered surface, The other end side forms an outward flange, and an annular gasket is interposed between the end faces when they are butted together. One end of the nut has a male thread formed on its peripheral surface that is inserted into the piping and a male thread member that abuts the outward flange, and the other end of the nut has a female thread formed on its inner peripheral surface that screws into the male thread inserted into the piping and an inward flange that engages with the outward flange.

[0010] The piping of the present invention is connected to the blocks by fixing one end of the piping with a tapered surface to each of the opposing blocks and connecting the male screw member and the cap nut member provided on the other end. In this case, the two pipes are connected at the other end by the male screw member and the cap nut member, so that there is no loosening due to co-rotation.

[0011] In this case, a third pipe is provided between the two pipes connected to the block, and the third pipe has outward flanges formed on both ends, through which a male thread member or a cap nut member can be inserted.

[0012] Furthermore, in this case, the third pipe can be configured so that at least one outward flange can be later attached to the end portion. Effect of the Invention

[0013] According to the piping of the present invention, loosening due to co-rotation does not occur during installation, and during maintenance, the piping can be removed by simply moving the piping in a direction perpendicular to the axis by approximately the diameter of the axis, without moving the piping in the axial direction by the amount required to pull it out. Furthermore, when a third piping is to be installed, by first removing the third piping, it is possible to provide a piping that can be removed from the block without moving the block at all. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a partially cutaway cross-sectional plan view showing a state in which opposing blocks are connected using the piping of the present invention. [Diagram 2] 4 is a partially cut-away plan view showing a connection portion between the pipe and the block. FIG. [Diagram 3] 4A is a partially cutaway sectional plan view showing the connection between the pipes, in which FIG. 4A is a partially cutaway sectional plan view showing the state in which the male screw member and the cap nut member are fastened, and FIG. 4B is a partially cutaway sectional plan view showing the state in which the fastening is released. [Figure 4] 13A is a partially cutaway cross-sectional plan view showing a second embodiment of the same piping, and FIG. 13B is a partially cutaway cross-sectional plan view showing a state in which male screw members are attached to both ends of a third pipe, and a cap nut member is attached to the third pipe. [Diagram 5] FIG. 11 is a partially cutaway cross-sectional plan view showing a modified example of the second embodiment of the piping. [Figure 6] 3A is a sectional plan view showing a third embodiment of the same piping, in which male thread members are attached to both ends of the third piping, and FIG. 3B is a partially cutaway sectional plan view showing the state in which one of the outward flanges has been removed. [Figure 7] FIG. 1 shows conventional piping, where (a) shows the state in which the piping rotates together with the block when attached to the block, and (b) is a partially cutaway cross-sectional plan view showing the connection between the piping and the block. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, preferred embodiments of the piping according to the present invention will be described with reference to the drawings. The shapes of the components and their relative positions described in the examples are merely illustrative and are not intended to limit the scope of the present invention unless otherwise specified. In addition, for convenience, the directions of the components may be referred to as up, down, left, right, etc. according to the directions on the drawings, but these do not limit the scope of the present invention.

[0016] <Embodiment 1> A first embodiment of the present invention is shown in Figures 1 to 3. Figure 1 is a partially cutaway front cross-sectional view showing a state in which opposing blocks 4 are connected using pipes 1A and 1B of the present invention.

[0017] The piping of the present invention is configured with a joint structure in which one end abuts against the tapered seal portion 40 of the block 4 to form a male portion of a so-called cone thread joint that prevents leakage of the internal fluid, and the other end is fastened to the annular gasket 13 by a screw member. Specifically, as shown in FIG. 1, the piping 1 is made up of at least two pieces of piping that connects between blocks 4, 4, each having a flow path 41 inside and an open end 4a of the flow path 41 on its surface, and the one end side connected to the block 4 is a common structure, and as shown in FIG. 2, the piping is provided with a tapered surface 10 that abuts against the tapered seal portion 40 formed on the open end 4a of the block 4 and a male screw portion 11 formed on the other end side of the tapered surface 10. A stopper 15 is screwed into the male screw portion 11 as in the conventional example, and a fixing member 14 is inserted into the piping 1, the fixing member 14 having a through hole 14c with a diameter slightly larger than the diameter of the piping 1 and a two-face width or hexagonal engagement portion 14b on the circumferential surface where the male screw portion 14a and a tool engage with each other.

[0018] The other end of the pipe 1 has a joint structure as shown in Fig. 3. The other end of the pipe 1A has an outward flange 12, which is butted together with an annular gasket 13 interposed between the end faces, a male thread 20 formed on the circumferential surface that is inserted into the pipe, and a male screw member 2 that abuts the outward flange 12 is provided. The other end of the pipe 1B has an outward flange 12 of the same shape as the other end of the pipe 1A, a female thread 30 that screws into the male thread 20 that is inserted into the pipe formed on the inner circumferential surface, and a cap nut member 3 that has an inward flange 31 that engages with the outward flange 12. A co-rotation prevention member 32 (e.g., a thrust bearing, etc.) that prevents co-rotation is provided between the inward flange 31 and the outward flange 12 of the pipe 1B.

[0019] In the above configuration, the blocks 4, 4 are connected by attaching the cone thread joints of the pipes 1A, 1B to the blocks 4, 4. First, as in the conventional example, the tapered surface 10 at the tip of the pipe 1 is pressed against the tapered seal portion 40 of the block 4, and the male thread 14a of the fixing member 14 is screwed into the female thread portion 43 formed on the inner peripheral surface of the mounting space 42 on the open end side of the tapered seal portion 40 of the block 4, and the tip of the fixing member 14 is screwed in until it abuts against the stopper 15, so that the tapered surface 10 abuts against the tapered seal portion 40 and is sealed. It is preferable that the angle between the tapered seal portion and the tapered surface is finished to be a slightly acute angle of, for example, 59° when the expansion angle θ1 of the tapered seal portion is 60°.

[0020] After fixing the pipes 1A and 1B to the blocks 4, 4, the other ends of the pipes are butted together and the male screw member 2 and the cap nut member 3 are screwed together, whereby the annular gasket 13 arranged between the butted end faces is crushed with a predetermined force, thereby preventing the fluid passing through the inside of the pipe 1 from leaking to the outside.

[0021] When it becomes necessary to remove the pipe 1 from the block 4 due to maintenance or the like, the pipe 1 can be removed from the block 4 simply by releasing the screw engagement between the male screw member 2 and the cap nut member 3 and moving one of the blocks 4 in a direction perpendicular to the axis of the pipe 1 by the diameter dimension of the pipe 1.

[0022] <Embodiment 2> A second embodiment of the present invention is shown in Figures 4 and 5. Figure 4 is a partially cutaway front sectional view showing a state in which opposing blocks 4 are connected using pipes 1A, 1B, and 1C of the present invention.

[0023] This embodiment is configured by disposing a third pipe 1C between the pipes 1A and 1B of the first embodiment, and the connection between the pipes 1A and 1B and the block 4 is the same as in the first embodiment, so the description thereof will be omitted.

[0024] The third pipe 1C arranged between the pipes 1A and 1B has outward flanges 12 at both ends and either a male screw member 2 or a cap nut member 3. FIG. 4(a) shows an example in which the male screw member 2 is arranged at both ends, and FIG. 4(b) shows an example in which the male screw member 2 is arranged at one end and the cap nut member 3 is arranged at the other end, but this is appropriately determined depending on whether the joint member arranged at the end of the pipes 1A and 1B is the male screw member 2 or the cap nut member 3. When this embodiment is adopted, the pipes 1A and 1B can be unified so that the joint member arranged at the other end is either the male screw member 2 or the cap nut member 3. In addition, regarding the length of the pipes, if the length of the pipe C is changed, the pipes 1A and 1B can be unified as exactly the same parts, thereby reducing costs.

[0025] The piping 1C has outward flanges 12 formed on both ends, and is constructed as a split structure near the center for attaching the male screw member 2 and the cap nut member 3, using a joining means such as welding. The male screw member 2 and the cap nut member 3 can also be split into two.

[0026] In this embodiment, in which a third pipe 1C is arranged between pipes 1A and 1B, there is no need to move block 4 when connecting block 4 or when removing pipe 1 for maintenance, and maintenance work can be easily performed even in facilities where block 4 is fixed after construction.

[0027] Furthermore, as shown in Figure 5, by using the pipe 1C by bending it at any angle, blocks can be easily connected even at irregular construction sites where the open ends of the blocks 4 do not face each other, and maintenance work can be carried out smoothly.

[0028] <Modification> A modified example of the second embodiment of the present invention is shown in Fig. 6. Fig. 6(a) is a front cross-sectional view of piping 1C of this embodiment.

[0029] In this modification, at least one of the outward flanges 12 of the third pipe 1C is configured so as to be able to be later attached to the end portion.

[0030] 6, a step 16 is provided at one end of a pipe 1C, and a male thread 17 is formed in the small diameter portion. The outward flange of this embodiment is formed of an annular member 12A having a female thread 18 on its inner circumferential surface that screws into the male thread 17 in the small diameter portion.

[0031] The annular member 12A may be attached to the pipe 1C by screwing, or may be fitted by interference fit or fixed by welding.

[0032] In this way, by configuring the outward flange to be retrofittable, there is no need to connect the pipes by welding, and leakage of fluid to the outside caused by poor welding can be effectively prevented. [Industrial Applicability]

[0033] The piping according to the present invention can be suitably used for connecting blocks having flow paths, and can also be suitably used to meet the demand for replacing equipment that uses existing cone thread joints. [Explanation of symbols]

[0034] 1 Piping 10 Tapered surface 11 Male thread 12 Outward flange 12A Circular member 2 Male threaded parts 20 Male thread 3 Cap nut material 30 Female thread 31 Inward flange 4 Blocks 40 Taper seal part 41 Flow Path

Claims

1. A piping system including at least a first piping and a second piping that connect a block having a flow path therein and an open end of the flow path on a surface thereof, one end side of the first pipe and the second pipe includes a tapered surface that abuts on a tapered seal portion formed at an open end of the block, and a male screw portion formed on the other end side of the tapered surface, The other end side forms an outward flange, and an annular gasket is interposed between the butted end faces. The other end of the first pipe is provided with a male thread member that has a male thread formed on its circumferential surface and that abuts the outward flange, and the other end of the second pipe is provided with a cap nut member that has a female thread formed on its inner circumferential surface and that screws onto the male thread inserted into the second pipe, and that has an inward flange that engages with the outward flange.

2. 2. The piping according to claim 1, wherein a third pipe is disposed between the first pipe and the second pipe connected to the block, and the third pipe has outward flanges formed on both ends thereof and is provided with the male thread member or the cap nut member.

3. The piping according to claim 2 , wherein the third piping is configured so that at least one outward flange can be attached to an end portion thereof later.

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