KR101305472B1 - pressure balance type expansion joint - Google Patents

Abstract

The pressure balance type expansion joint of the present invention has a cylindrical first sleeve in which first protrusions are formed at intervals in the circumferential direction, and a first guide groove is formed between the first protrusions, and the first protrusion in the circumferential direction. The second protrusion having a second protrusion inserted into the first guide groove between the second protrusion and the second guide groove into which the first protrusion is inserted between the second protrusions, and the first protrusions of the first sleeve. One side is fixed and the outer circumferential surface is supported by the first variable ring member and the other side is fixed to the outer circumferential surface of the second sleeve, and one side is fixed to the second protrusions of the second sleeve and the outer circumferential surface is first And a second bellows unit supported by the second variable ring member and fixed to an outer circumferential surface of the first sleeve, and a third bellows unit having end portions fixed to the first and second variable ring members, respectively.

Description

Pressure balance type expansion joint

The present invention relates to an expansion joint, and more particularly, to a pressure balance type expansion joint that can be balanced by internal pressure, and can balance a bidirectional flow of fluid.

In general, expansion joints (or couplings) are installed between two pipes to absorb vibration of the pipe, and absorb expansion and contraction amount in the longitudinal direction to prevent breakage of the pipe.

Such expansion joints are used in hot blast furnace equipment used in steel mills, ie, facilities for manufacturing and supplying hot hot wind so that molten iron and slag are formed in blast furnaces loaded with iron ore and coke as fuel.

The expansion joint installed in the hot air facility is installed in a steel sheet pipe surrounding the outside of the insulation pipe made of a blower pipe or a firebrick to absorb the displacement force due to thermal expansion and shrinkage.

Meanwhile, the conventional expansion joint includes a left end pipe and a right end pipe, which are connected to a first movable plate and a first bellows member having a through hole formed therein, and a second movable plate having a right end pipe and a through hole formed therein. Is connected by a second bellows member, and the first and second movable plates on which the first and second bellows members are supported are connected by a third bellows member. The third bellows member has a diameter relatively larger than the diameter of the first and second bellows members, the first movable plate is connected by the right end pipe and the first fixing member to interlock with each other, and the second movable plate is It has a structure that is connected by the left end pipe and the second fixing member to interlock.

In the conventional expansion joint configured as described above, since the first, second, and third bellows forms part of the conduit, the resistance of the air passing therethrough is relatively large, resulting in a large loss head in the conduit. In addition, since the first and second movable plates have a structure supported by the first and second fixing members and the bellows, there is a problem that the joint part sags due to its own weight. have.

On the other hand, the first, second, third bellows is made of a relatively thin iron plate is designed to be easy to stretch and expand, but there is a problem that is easily damaged by the impact from the inside or outside. In particular, the amount of displacement due to thermal expansion or contraction of the blower tube is partially acted on a specific portion of the bellows, and thus there is a problem in that the deformation force in the displacement occurs at each portion of the bellows.

The present invention is to solve the problems described above, the structure is relatively simple, the installation area can be reduced, and the pressure that can prevent the bellows from being damaged by the impact applied from the inside by improving the structural strength The purpose is to provide a balance type expansion joint.

Another object of the present invention is to provide a pressure balance type expansion joystick which can achieve structural safety by uniformly acting on the bellows deformation force due to thermal expansion or contraction of the blower tube.

The pressure balance type expansion joint of the present invention for achieving the above object is a cylindrical first sleeve, in which first protrusions are formed at predetermined intervals in a circumferential direction, and a first guide groove is formed between the first protrusions. Eve,

A second sleeve having a second protrusion inserted into the first guide groove between the first protrusions in the circumferential direction and a second guide groove into which the first protrusion is inserted between the second protrusions;

A first bellows unit having one side fixed to the first protrusions of the first sleeve and having an outer circumferential surface supported by the first variable ring member and the other side fixed to the outer circumferential surface of the second sleeve;

A second bellows unit having one side fixed to the second protrusions of the second sleeve, the outer circumferential surface thereof being supported by the second variable ring member, and the other side fixed to the outer circumferential surface of the first sleeve;

And a third bellows unit having end portions fixed to the first and second variable ring members.

 In the present invention, each of the first and second bellows unit is provided with a bellows having a corrugated shape in cross section, and a control ring installed at the valley portion of the bellows to prevent the bellows from being unevenly deformed or damaged due to elastic deformation. .

The first variable ring member includes a first splined pipe and a first staling supported by the first splined pipe, and the second variable ring member includes a second splined pipe and a second splined pipe. Two stays are provided. In addition, the combination of the first sprocket, the first bellows and the second protrusion is formed with first slots formed at a predetermined depth from an end portion of the first spline pipe along the trajectory of the end portions of the first slot and the first spline pipe. The second protrusion is welded. The combination of the second sprocket, the second bellows and the first protrusion is formed by forming second slots in a second depth at a predetermined depth from an end thereof and along a trajectory of the ends of the second slot and the second splice. 1 The projection is welded.

As described above, the pressure balance type expansion joint according to the present invention is made by relatively moving the elastic force of the hot air pipe while the first and second protrusions of the first and second sleeves are alternately coupled. It can reduce the installation space. In addition, the displacement amount (deformation amount) according to the stretching force of the hot air pipe in which the expansion joint is installed is uniformly applied to each part of the first and second sleeves, thereby preventing the first, second and third bellows units from being unevenly deformed or damaged. can do.

In addition, since the first and second bellows inner surface of the first and second bellows unit has a structure blocked by the first and second sleeves, it is possible to reduce the ventilation resistance due to the flow of gas.

1 is a cross-sectional view of a pressure balance type expansion joint according to the present invention,
2 is an exploded perspective view of a pressure balance type expansion joint according to the present invention;
3 is a side view of a pressure balance type expansion joint,
4 is a partial ablation perspective view showing an extract of the bellows,
Figure 5 is a partial ablation perspective view showing a state in which the bellows is coupled.

The pressure balance type expansion joint according to the present invention is installed in a pipeline through which a heat fluid flows to absorb elastic force due to thermal expansion, and an embodiment thereof is illustrated in FIGS. 1 and 3.

Referring to the drawings, the pressure balance type expansion joint 10 is installed in an air duct for supplying hot air to a blast furnace. The first protrusions 21 and the first guide grooves 22 alternately in the circumferential direction. The first sleeve 20, the second protrusions 31, and the second guide groove 32, which are installed alternately in the circumferential direction, are slidably coupled to each other. That is, the second protrusions 31 are inserted into the first guide grooves 22 between the first protrusions 21, and the first protrusions 21 are inserted between the second guide grooves 32 so that the first protrusions 21 are interposed therebetween. It has a structure that is relatively movable.

In addition, one side of the expansion joint 10 is fixed to the first protrusions 21 of the first sleeve 20, the outer circumferential surface thereof is supported by the first variable ring member 11, and the other side thereof has the second sleeve 30. One side is fixed to the first bellows unit 40 and the second protrusions 31 of the second sleeve 30 fixed to the outer circumferential surface of the) and the outer circumferential surface is supported by the second variable ring member 12. The second bellows unit 50 having the other side fixed to the outer circumferential surface of the first sleeve 20 and the third bellows unit 60 having end portions fixed to the first and second variable ring members 11 and 12, respectively. It is provided.

Referring to the expansion joint 10 according to the present invention configured as described in more detail, each of the first and second protrusions 21, 31 of the first and second sleeves 20, 30 are mutually It is preferable to combine to form a cylindrical shape, and the first and second protrusions 21 and 31 may be slid so that both edges are close to each other, and to reduce the flow resistance of air. The length of the first and second protrusions 21 and 31 may be adjusted in consideration of the expansion amount of the hot air pipe in which the expansion joint is installed.

In addition, one side of the first bellows unit 40 is fixed to the first protrusions 31 of the first sleeve 20, as shown in FIGS. 1 and 4, and an outer circumferential surface thereof of the first variable ring member 11. a first bellows 41 having a corrugated shape supported by a first stay ring and fixed to an outer circumferential surface of the second sleeve 30, and having a first bellows at a bent portion of the first bellows 41. A first control ring 42 is provided to prevent the 41 41 from being damaged by the deformation force beyond plastic deformation.

In addition, one side of the second bellows unit 50 is fixed to the second protrusions 21 of the second sleeve 30, and an outer circumferential surface thereof is supported by a first stay ring 12, and the other side thereof. A second bellows 51 having a corrugated shape fixed to an outer circumferential surface of the first sleeve 20 is provided, and the second bellows 51 is damaged by deformation force of plastic deformation or more at the bent portion of the second bellows 51. The second control ring 52 is prevented from becoming.

The first variable ring member 11 having one side supporting the first bellows installed at the second protrusion 31 includes a first spool pipe 11a coupled to the first bellows 41 and the first bellows. A first stay ring (11b) radially mounted to the spool pipe is provided. The second variable ring member having the second bellows has substantially the same technical configuration as the first variable ring member. That is, the second variable ring member 12 may include a second spool pipe 12a coupled to the second bellows 51 and a second stay ring 12b radially installed on the second spool pipe; stay ring).

Here, the combination of the first protrusion 21 and the second bellows 41 end portion and the first splice pipe 11a to increase the coupling force thereof is as shown in FIG. 5 from the end portion of the first protrusion 21. The first slots 21c are formed to a predetermined depth, and the first protrusions are welded along the trajectories of the ends of the first slots 21c and the first spl pipes. In addition, the combination thereof for increasing the coupling force between the second protrusion 31 and the end of the first bellows 41 and the second sprinkled pipe 11a is a second depth at a predetermined depth from the end to the second splung pipe 12a. Slots 12c are formed and the first projections 21 are welded along the trajectories of the ends of the first slots 12c and the second split pipes.

On the other hand, the third bellows unit 60 is installed on the third bellows 61, both ends of which are fixed to the first and second stays 11a and 12a, and the valleys of the third bellows 61. Second control 62 is provided.

A lug 70 for suspending the expansion joint according to the present invention is installed at one side of the first and second stays 11a and 12a. Further, the first and second variable ring members 11 and 12 and the sleeve may be provided with a separate fix bolt for construction as shown in FIGS. 1 and 3, and the fix bolt may be expanded in the field. The joint is separated after it is installed. Reference numerals 25 and 35 are fixing brackets for fixing the blower.

The pressure balance type expansion joint 10 according to the present invention configured as described above is installed in a blower tube for supplying hot air to a blast furnace of a steel mill and the like to absorb the displacement amount due to expansion and contraction due to thermal expansion of the blower tube. To supply hot air to the two sleeves 20 and 30, a blower pipe is connected to form a single blower pipe path.

When the blower tube is thermally expanded by the supply of hot air in this state, the displacement amount due to the thermal expansion of the blower tube acts in a direction opposite to the first and second sleeves 20 and 30 as shown in FIG. 5.

Accordingly, while the first and second sleeves 20 and 30 move relative to each other in directions opposite to each other, the third bellows 61 of the third bellows unit 60 is extended and the first and second bellows units 40 are extended. (50) The first and second bellows 41 and 51 are compressed. In this process, the first and second protrusions 21 and 31 are inserted into the second guide grooves 32 and the first guide grooves 22, respectively, so that the first and second protrusions 21 and 31 are moved relative to each other. It acts uniformly on each part of the eves 20 and 30.

In particular, since the first and second sleeves are relatively moved, the inner surfaces of the first and second bellows 41 and 51 are surrounded by the smooth first and second sleeves, thereby reducing the loss in the tube of hot air passing therethrough. . In addition, since the additional devices are not installed in the first and second staying rings 11a and 12a supporting the third bellows unit as in the related art, the diameter of the expansion joint can be prevented from becoming unnecessarily large. Occupied space can be reduced according to the installation of the expansion joint according to.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention.

Therefore, the true scope of protection should be defined only by the appended claims.

Claims (3)

A cylindrical first sleeve having first protrusions formed at intervals in the circumferential direction and having a first guide groove formed between the first protrusions;
A second sleeve having a second protrusion inserted into the first guide groove between the first protrusion in the circumferential direction, and a second guide groove into which the first protrusion is inserted between the second protrusions;
A first bellows unit having one side fixed to the first protrusions of the first sleeve and an outer circumferential surface supported by the first variable ring member and the other side fixed to the outer circumferential surface of the second sleeve;
A second bellows unit having one side fixed to the second protrusions of the second sleeve, the outer circumferential surface thereof being supported by the second variable ring member, and the other side fixed to the outer circumferential surface of the first sleeve;
And a third bellows unit having end portions fixed to the first and second variable ring members, respectively. The method of claim 1,
Each of the first and second bellows units is provided with a bellows having a corrugated cross section and a control ring installed at a valley portion of the bellows to prevent the bellows from being unevenly deformed or damaged by elastic deformation. Pressure balanced expansion joint. The method of claim 2,
The first variable ring member includes a first splined pipe and a first staling supported by the first splined pipe, and the second variable ring member includes a second splined pipe and a second splined pipe. With 2 stays
The combination of the first sprocket pipe, the first bellows and the second protrusion is formed with first slots formed at a predetermined depth from an end portion in the first spline pipe and along the trajectory of the end portions of the first slot and the first spline pipe. The second protrusion is welded, and the combination of the second sprocket, the second bellows and the first protrusion is formed with second slots in a predetermined depth from an end portion of the second sprocket, and the second slot and the second The pressure balance type expansion joint, characterized in that the first projection is welded along the trajectory of the end.

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