KR100633004B1 - Joint for heat-resistant pumbling - Google Patents

Abstract

The present invention relates to a joint for connecting pipes.

The joint for heat-resistant piping of this invention has the housing which covers the periphery of the pipe end of two pipes, and the seal rubber ring provided in the inside of this housing, The flange part was provided in the outer periphery of the said housing | casing of the said housing. In this way, the seal performance can be maintained for a long time without an unnecessary load on the rubber ring.

Description

Joint for heat-resistant pumbling

1A to 1C show the configuration of a C-type joint as a first embodiment of the present invention, FIG. 1A is a sectional view, FIG. 1B is a front view, and FIG. 1C is a bottom view.

2 is a cross-sectional view showing the configuration of a G-shaped joint which is another embodiment of the present invention.

3 is a cross-sectional view showing the configuration of an S-shaped joint which is another embodiment of the present invention.

Figure 4 is a partially cut away perspective view showing the configuration of a conventional C-type joint.

5 is a cross-sectional view of a conventional C-type joint.

6A to 6D are views for explaining the function of the C-type joint.

<Description of Major Symbols in Drawing>

1 .... housing, 2 .... rubber ring for seal

3 .... Type C wire ring 4 .... Flange section

5 .... fastening bolt 6 .... nut

7 .... pipe 8 .... home

9 .... color

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for connecting pipes, and more particularly, to a joint for heat-resistant piping having a function of inhibiting bending, rotation, and misalignment of a joint and an eccentricity (displacement absorption) suppression function in a plurality of uses.

In the conventional pipe joint, in the case of the C-type joint 10 shown in FIG. 4, the C-type wire ring 12 is welded to a predetermined position of the pipe ends of the two pipes 11, and the rubber ring (13) is inserted into both ends of the tube, and the housing 14 is covered and formed, and the separation prevention is carried out by the C-shaped ring 12 in the circumference of the groove of the housing 14, and the seal is connected to the fastening of the bolt nut 15. Thus, the rubber ring 13 is a structure that exhibits its function.

Since the joint 10 of the C type is based on the sealing principle (automatic seal) of the U-shaped washer, the two pipes 11 to be connected can obtain a stable airtight effect against movement within the functional range of the joint. have. As shown in Fig. 5, the width of the housing is designed to be larger than the mooring width, and this clearance (E dimension) is a point for absorbing expansion, bending, bending (displacement absorbency), and rotation. This point is explained concretely.

(1) expansion and contraction (see FIG. 6A)

The clearance can obtain the maximum E dimension in the whole, and when the clearance of the pipe end is set to 0, the shrinkage of the pipe equivalent to the E dimension is absorbed. In addition, when the clearance of the tube stage is set to the maximum E dimension, the elongation of the tube equal to the E dimension is absorbed.

In general, in the case of absorbing expansion and contraction of a pipe by a joint, pipes are set by setting the E dimension from the temperature difference in use and the temperature difference in piping, and absorb the expansion and contraction of the pipe. The amount of expansion and contraction (E) of the pipe can be obtained by the following equation.

E = L (tube length) × α (linear expansion coefficient) × t (temperature difference)

The coefficient of linear expansion of iron is 1.2 × 10 ⁵

(2) bending (see FIG. 6B)

If the clearance of the pipe end is 0 and the other is E, the amount θ of the pipe bend is obtained by the trigonometric function of the pipe outer diameter O.D and the E dimension.

sin θ = E / (O.D)

(3) eccentric (see Figure 6c)

Eccentricity cannot be absorbed by one joint. As shown in Fig. 6C, two joints are used in combination, and the eccentricity is absorbed by the bending of the joint and the tube length.

Eccentricity δ = Lsin θ

(4) rotation (see Figure 6d)

Since only the rubber ring is in contact with the tube, it can be rotated. Due to the high sealability of the rubber ring, the pipe does not leak at all even if the pipe is rotated 360 °. The elbow tube can be used as the pipe for absorbing interlayer displacement and unequal settlement.

The above is the basic structure and function of this kind of joint.

The general function of this kind of pipe joint is adopted and spread in many industries as an oil pipe method.

However, depending on the pipe purpose and piping conditions, the above-described functions may be reversed and become unstable.

Heat-resistant piping such as hot water supply, hot water, and cold and hot water pipes (ondol pipes, etc.) in building equipment pipes, such as the bending of the joints, the eccentric absorption function of multiple uses, and the rubber ring is displaced by heat. It may leak by plastic change and deterioration. The piping is subjected to various stresses and loads during piping, after piping, and during operation. Even in such a case, the rubber ring must maintain the shape, elasticity and dimensions in a sealable state so that it can cope with any condition.

The problem to be solved by the present invention is to provide a heat-resistant pipe joint which can maintain the seal performance for a long time without a load on the rubber ring more than necessary.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention has the housing which covers the periphery of the pipe end of these two pipes, and has a rubber ring for sealing provided in this housing so that two pipes may be connected with clearance between pipe ends. In the joint for heat-resistant piping, the seal rubber ring is a seal rubber ring in contact with a groove provided in the inner side of the housing, and the outer edge of the housing extends to a predetermined thickness along the longitudinal direction of the pipe to complete the set. Flange is provided in close contact with the outer peripheral surface of the city pipe.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring an Example shown in drawing.

1A to 1C show the configuration of a C-type joint as a first embodiment of the present invention. FIG. 1A is a sectional view, FIG. 1B is a front view, and FIG. 1C is a bottom view. In these figures, 1 is a housing, 2 is a rubber ring for sealing, 3 is a C-shaped wire ring welded to the pipe end of the pipe 7, and 4 is a constant thickness along the length of the pipe at the outer periphery of the housing. Flange provided to extend, 5 is a fastening bolt, 6 is a nut.

As such, in the present embodiment, the flanges 4 are formed on both outer circumferences of the housing 1.

It is molded integrally. The inner diameter of the flange portion 4 is almost close to the outer diameter of the tube, and has a structure and a size close to the outer circumference of the tube when the bolt 5 and the nut 6 are tightened.

Thus, the flange part 4 is provided in the outer periphery of the housing 1, and it adhere | attaches on the outer periphery whole surface of the pipe 7 at the time of completion of a set, and the rubber ring 2 of the pipe end part at the time of piping, after piping, and operation is carried out. The bending load and the load in the direction in which the center changes are made to the structure. All of the above-mentioned loads applied to the tube ends are received by the flange portion 4 of the housing 1, and after the set, the structure is capable of inhibiting bending, sagging and the like mechanically (automatically).

The joints for heat resistant pipes need a function of absorbing expansion and contraction due to the temperature difference of the pipes. However, in the present invention, since the movement in the axial direction of the pipes is not regulated, they can be absorbed.

In addition to the C-type joint shown in FIG. 1, the flange portion 4 which extends to a certain thickness along the longitudinal direction of the pipe 7 also has a G-type joint shown in FIG. 2 and an S-type joint shown in FIG. 3. The present invention can be carried out by providing the outer periphery of the outer edge portion of the housing 1. In addition, the G-joint of FIG. 2 is provided with the groove | channel 8 in the pipe 7, and has a housing detachment prevention function similar to the C-type wire ring 3 of the C-joint of FIG. The S-type joint 3 is welded to the tube end with a collar 9 to have a housing detachment prevention function similar to that of the C-type wire ring 3 of the C-type joint in FIG. 1.

 As mentioned above, according to this invention, it has the following effects.

(1) A flange portion extending to a certain thickness along the longitudinal direction of the pipe is provided on the outer periphery of the housing and adhered to the front surface of the pipe at the time of completion of the set so that the pipe end at the time of piping, after piping, and during operation ( The bending load and the load in the direction in which the center is different are not applied to the rubber ring portion). All the loads applied to the tube ends are received by the flange portion of the housing, so that bending, sagging and the like can be suppressed mechanically (automatically) after the set.

(2) The joints for heat resistant pipes need to absorb the expansion and contraction caused by the temperature difference of the pipes. However, the present invention does not restrict the movement of the pipe in the axial direction.

(3) By adhering both ends of the outer edge of the housing to the outer circumference of the tube, it becomes possible to mechanically (automatically) suppress the stress and load that plastically deform the rubber ring most important in the heat resistant pipe.

(4) The present invention also has a cost effect and an effect that can significantly reduce the use quantity of fixtures, hooks, and supports attached to the pipe from the structural aspect.

Claims (1)

In the joint for heat-resistant piping having a housing covering the periphery of the pipe ends of the two pipes so as to connect two pipes with a clearance between the pipe ends, and a rubber ring for a seal provided inside the housing, The seal rubber ring is a seal rubber ring in contact with a groove provided in the inner side of the housing, The outer periphery of the housing, the heat resistance pipe joint, characterized in that provided with a flange extending in a predetermined thickness along the longitudinal direction of the pipe and in close contact with the outer peripheral surface of the pipe when the set is completed.

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