KR20220146233A - Vacuum maintenance system for steam transfer pipe - Google Patents

Abstract

The present invention relates to a vacuum maintenance system of a steam transfer pipe having a vacuum maintenance apparatus for maintaining a vacuum state of a steam transfer pipe including an outer pipe, an inner pipe disposed in an inner region of the outer pipe along a longitudinal direction, and formed to be longer than the outer pipe along the longitudinal direction to transfer steam, and an insulator layer surrounding the outside of the inner pipe by a predetermined thickness, and disposed apart from the inside of the outer pipe to form an insulation space. More specifically, in accordance with one embodiment, the vacuum maintenance system of a steam transfer pipe includes: an outer pipe airtight connection unit having one side airtightly coupled to an end region along a circumferential direction of the outer pipe and elongated from one side along a longitudinal direction to be longer than the outer pipe; an airtight expansion and contraction pipe coupled to an end region along the circumferential direction of the other side of the outer pipe airtight connection unit and one region along the circumferential direction of the inner pipe to form an airtight heat insulation space, and capable of being expanded and contracted when the inner pipe is moved; and a vacuum forming unit communicating with an insulation space through the outer pipe airtight connection unit, and discharging the air from the insulation space to the outside such that a vacuum state can be formed therein.

Description

Vacuum maintenance system for steam transfer pipe

The present invention relates to a vacuum maintenance system for a steam transport pipe, and more particularly, to a vacuum maintenance system for a steam transport pipe capable of maintaining a vacuum state in an insulating space of a steam transport pipe transporting steam.

A double pipe-shaped steam transfer pipe is used to transport the steam from the supplier to the place of use using steam for heating or industrial purposes. This steam conveying pipe forms an insulating space by separating the inner pipe and the external for thermal insulation efficiency, and creates a vacuum state by discharging the air in the insulating space. Steam is supplied to the opening of the insulating space of the steam transfer pipe.

However, when the vacuum holding device is fixed and connected to the opening of the insulated space of the steam transport pipe and the air in the insulated space is discharged to the outside, but high-temperature steam enters the inner tube, the inner tube thermally expands and expands in the longitudinal and transverse directions. And there is a problem that the appearance is damaged.

Embodiments of the present invention have been devised to solve the problems of the prior art, and despite the expansion of the inner tube due to the inflow of high-temperature steam, steam transfer capable of stably maintaining the vacuum state of the insulating space without steam leakage An object of the present invention is to provide a vacuum maintenance system for piping.

According to one aspect of the present invention, it is disposed in the inner region of the outer appearance along the outer appearance and the longitudinal direction, and is formed to be longer than the outer appearance along the longitudinal direction and surrounds the outer side of the inner tube and the inner tube with a predetermined thickness, which can transport steam, In the vacuum maintenance system of the steam transport pipe having a vacuum holding device for maintaining the vacuum state of the steam transport pipe having a heat insulating material layer disposed at a distance with respect to the inner side of the exterior to form an insulating space, one side is the An exterior airtight connection part which is airtightly coupled to the end region along the circumferential direction of the exterior and extends longer than the exterior from the one side in the longitudinal direction; an airtight expansion tube that is coupled to an end region along the circumferential direction of the other side of the outer airtight connection part and a region along the circumferential direction of the inner tube to airtightly form the heat insulating space, and which can be expanded and contracted when the inner tube is moved; and a vacuum forming part communicating with the insulating space through the external airtight connection part and discharging the air of the insulating space to the outside to be in a vacuum state, the vacuum maintenance system of the steam transport pipe may be provided.

In addition, the vacuum forming unit may include: a discharge pipe communicating with the heat insulating space through the external airtight connection unit to discharge the air of the heat insulating space to the outside; a discharge valve disposed on the discharge pipe to regulate the air flow of the discharge pipe; And the discharge pipe is connected to communicate with each other and may include a discharge driver for discharging the air of the heat insulating space to the outside.

In addition, the vacuum forming unit further includes a pressure sensing unit for sensing the pressure of the insulating space, storing the critical pressure of the insulating space, and when it is determined that the atmospheric pressure sensed by the pressure sensing unit exceeds the critical pressure The control unit may further include a control unit for controlling the discharge valve and the discharge driver to discharge the air in the insulation space to the outside so that the pressure of the insulation space does not become at least the critical pressure.

In addition, it may further include a support flange formed extending in a direction away from the axial center of the exterior from a region along the circumferential direction of the exterior airtight connection portion.

In addition, at least one of the airtight connection part and the airtight expansion tube may be formed with a section having a shape of a waveform such that an area in contact with the outside increases.

The vacuum maintenance system of the steam transport pipe according to the embodiments of the present invention has an effect of stably maintaining the vacuum state of the insulating space without steam leakage despite the expansion of the inner pipe due to the inflow of high-temperature steam.

In addition, the vacuum maintenance system of the steam transport pipe according to the embodiments of the present invention detects the pressure in the insulating space and discharges the air in the insulating space to the outside even when the pressure rises due to the inflow of air, thereby providing a vacuum in the insulating space. Since the state can be maintained, it is possible to prevent a decrease in the thermal efficiency of the steam of the steam transfer pipe.

1 is an exemplary view of a position in which a vacuum maintenance system of a steam transfer pipe is installed according to an embodiment of the present invention.
Figure 2 is a simplified exemplary view showing the vacuum maintenance system of the steam transfer pipe.
3 is a control block diagram of the vacuum maintenance system of the steam transfer pipe.
4 is a perspective view showing the structure of the steam transport pipe.
5 is a cross-sectional view illustrating an internal structure of the steam transport pipe of FIG. 4 by cutting it in a first direction.
6 is an operation diagram of thermal expansion in the longitudinal direction by flowing high-temperature steam into the inner pipe of the steam transport pipe.
7 is an operation diagram of thermal expansion of the inner tube diameter by flowing high-temperature steam into the inner tube of the steam transfer pipe.
8 is a view showing a modified example of the inner pipe support column of the steam transport pipe.
9 is a perspective view of a modified steam delivery pipe end region.
10 is an operation diagram of a modified steam delivery pipe end region.
11 is an exemplary view for fixing the inner tube among the plurality of steam transfer pipes.
12 is a cross-sectional view of an example of fixing the inner tube of FIG. 11 .
13 is an exemplary view of a pipe connection part for connecting an inner pipe among a plurality of steam transport pipes.
14 is an exemplary view of the configuration of the fixed coupling portion for fixing the inner tube.
15 is an exemplary view in which a fixed coupling portion for fixing the inner tube is disposed.

Hereinafter, specific embodiments for implementing the spirit of the present invention will be described in detail with reference to the drawings.

In addition, in the description of the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

The terminology used herein is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In addition, in the present specification, expressions of spacing, arrangement, etc. have been described with reference to the drawings in the drawings, and it should be clarified in advance that if the direction of the object is changed, it may be expressed differently. For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings, and the size of each component does not fully reflect the actual size.

As used herein, the meaning of 'comprising' specifies a particular characteristic, region, integer, step, operation, element and/or component, and other specific characteristic, region, integer, step, operation, element, component, and/or group. It does not exclude the existence or addition of

Here, the steam delivery piping system will be described. The steam transport pipe system may include a steam transport pipe 1 for transporting steam, a manhole 2, and a vacuum maintenance system 80 of the steam transport pipe. Since the manhole 2 is not included in the present invention, its description is omitted.

The steam transfer pipe 1 is connected from the local cogeneration power plant and the local plant to the place where steam is used, and is a transfer path that is buried underground from the ground to the cogeneration plant and the local plant to supply steam to the place where the steam is used.

The vacuum maintenance system 80 of the steam transport pipe is a device that allows the heat insulation space in the steam transport pipe 1 to be made into a vacuum state.

Hereinafter, a detailed configuration of the steam transport pipe 1 according to an embodiment of the present invention will be described with reference to the drawings.

Figure 1 is an exemplary view of a position where the vacuum maintenance system of the steam delivery pipe is installed according to an embodiment of the present invention, Figure 2 is a simplified illustration showing the vacuum maintenance system of the steam delivery pipe, Figure 3 is steam delivery It is a control block diagram of a vacuum maintenance system of a pipe, FIG. 4 is a perspective view showing the structure of a steam transport pipe according to an embodiment of the present invention, and FIG. 5 is a steam transport pipe of FIG. It is a cross-sectional view showing the structure, and FIG. 6 is an operation diagram in which high-temperature steam flows into the inner tube of the steam transfer pipe and thermal expansion in the longitudinal direction, and FIG. 8 is a view showing a modified example of the inner pipe support column of the steam transport pipe, FIG. 9 is a perspective view of the deformed steam transport pipe end region, and FIG. 10 is an operation diagram of the deformed steam transport pipe end region, 11 is an exemplary view for fixing the inner tube among a plurality of steam transfer pipes, FIG. 12 is a cross-sectional view of an example for fixing the inner tube of FIG. 8, and FIG. and FIG. 14 is an exemplary configuration diagram of a fixed coupling part for fixing the inner tube, and FIG. 15 is an exemplary view in which a fixed coupling part for fixing the inner tube is disposed.

1 to 12 , the steam transport pipe 1 according to an embodiment of the present invention includes an exterior 10, an inner tube 20, a heat insulating material layer 30, an inner tube support portion 40, and an expansion tube 50 ), a pipe connection part 60 and a fixed coupling part 70 may be included.

The outer tube 10 is a pipe disposed on the outside of the double tube and has a larger diameter than the inner tube 20 . The exterior 10 may include an exterior body 11 and an inner flange 12 . The exterior 10 generally consists of only the exterior body 11, and may additionally have an inner flange 12 bent in the axial direction in the distal region.

The outer body 11 may be formed in a pipe shape. In general, the exterior body 11 preferably has a circular cross section, but is not limited thereto.

The inner flange 12 is formed to extend inwardly from the end region along the circumferential direction of the outer body 11 toward the axial center.

The inner tube 20 is disposed inside the outer tube 10, and provides a transport path for steam to be transported. In more detail, the inner tube 20 is disposed in the inner region of the outer tube 10 along the longitudinal direction, and is formed longer than the outer tube 10 along the longitudinal direction to transport steam. The inner tube 20 may include an inner tube body 21 and a protruding fixing part 22 .

The inner tube body 21 has an outer diameter smaller than the diameter of the outer body 11 of the outer tube 10 by a predetermined length or more. The inner tube body 21 may be formed to have a shape and cross section similar to or the same as the shape and cross section of the outer body 11, or may be formed to have a different shape and cross section. The inner tube body 21 may transfer high-temperature steam of 200° C. or higher, particularly 250° C. or higher and 400° C. or lower, to the heat insulating tube through the transfer passage.

The protrusion fixing part 22 is coupled to the outer side along the circumferential direction of the inner tube body 21 and may be formed in a flange shape away from the axis, and protrudes from a partial area of the outer side along the circumferential direction of the inner tube body 21 to the outside It may be formed having a shape extending to The protrusion fixing part 22 may be configured so that the expansion and contraction pipe 50 and the airtight expansion pipe 82 to be described later can be coupled. The protrusion fixing part 22 is formed in a shape protruding outward from the outside of the inner tube 20 so that the other side of the expansion tube 50 to be described later can be coupled thereto.

The heat insulating material layer 30 surrounds the outer side of the inner tube 20 with a predetermined thickness, and is disposed with a spacing therebetween with respect to the inner side of the outer tube 10 to form an insulating space between the outer tube 10 and the inner tube 20 . Since the temperature of the steam transferred through the inner tube 2 is about 200 ~ 400 ℃, it must be able to withstand it, and it may be made of inorganic and organic materials having a high thermal insulation function for this temperature. The heat insulating material layer 30 may include a heat insulating main layer 31 and a heat insulating single layer 32 .

The thermal insulation main layer 31 may have a spaced apart from the inner surface of the exterior 10 to form a thermal insulation space.

The thermal insulation single layer 32 has a single-layer shape at the end of the inner tube 20 so as not to be caught during the longitudinal movement of the exterior 10 of the inner tube 20 . The heat insulation single layer 32 may be formed to have a height lower than that of the heat insulation main layer 31 in the distal region of the heat insulation main layer 31 .

The inner tube support unit 40 is configured such that the inner tube 20 is disposed while maintaining a constant distance inside the outer tube 1, and when high-temperature steam flows, the inner tube 10 can thermally expand in the longitudinal and transverse directions. Even in this case, as the inner tube 20 moves through thermal expansion relative to the outer surface, the outer tube 10 and the inner tube 20 are not damaged and can help to stably transport steam. The inner tube support unit 40 may include an inner tube support column 41 , a rotating ball 42 , a ball elastic pressing unit 43 , an inner tube support clamp 44 , and a fixed pad 45 .

The inner tube support column 41 is formed to extend toward the inner side of the outer tube 10 in a state supported on the outer side of the plurality of inner tube 20 . The inner tube support column 41 may include an elastic pressing unit accommodating portion 411 and a ball stopping portion 412 .

The plurality of inner tube support pillars 41 may be arranged in a predetermined range with respect to the longitudinal direction of the inner tube 20 . And the plurality of inner tube support pillars 41 are provided in at least one pair, and at least one pair of inner tube support pillars 41 may be disposed to face the same axis center of the inner tube 20 .

The elastic pressing unit accommodating portion 411 may accommodate the ball elastic pressing unit 43 and the rotating ball 42 that are hollow in a cylindrical shape and apply elasticity to the inner surface of the outer surface 10 of the rotating ball 42 . .

The ball stopping part 412 is formed to protrude toward the axis in the end region along the circumferential direction of the inner surface of the elastic pressing part accommodating part 411, and the rotating ball 42 accommodated in the elastic pressing part accommodating part 411 is ball elastically pressed. It can be prevented from moving to the inner surface of the exterior (10) by the portion (43). The ball blocking portion 412 may protrude in a flange-like shape toward the axis in the entire distal region along the circumferential direction of the inner surface of the elastic pressing unit accommodating portion 411, or may protrude only in a partial region. In addition, when protruding from a partial region at the distal end along the circumferential direction of the inner surface of the elastic pressing unit accommodating portion 411, it is preferable to protrude from at least three places forming an equilateral triangle around the axis.

The rotating ball 42 is rotatably coupled to the extended end of the inner tube support column 41 and can be rotated in a state disposed so as to be in contact with the inner side of the outer tube 10 when the inner tube 20 moves in the longitudinal direction.

The ball elastic pressing unit 43 is supported on the inner tube support column 41 and may apply elasticity to the inside of the outer tube 10 of the rotating ball 42 . The ball elastic pressing part 43 may have an elastic strength capable of supporting at least the inner tube 20 . The elastic strength of the ball elastic pressing part 43 can support at least the weight of the inner tube 20 so that the inner tube 20 is not biased from the inside of the outer tube 10 . The ball elastic pressing unit 43 may be provided with a spring, but may be provided with a cylinder and a piston and then elastically pressurized using hydraulic pressure or compressed air.

The inner tube support clamp 44 surrounds the outer side of the inner tube and is formed to be clampable.

The fixing pad 45 may be interposed between the inner tube support clamp 44 and the outer tube 20 so that the inner tube support clamp 44 is fixed to the inner tube 20 . If the inner tube support clamp 44 is made of metal and the inner tube 20 is also made of metal, it may slip after being clamped. have. Since the fixing pad 45 has an adhesive embedded therein, the bonding force between the inner tube support clamp 44 and the inner tube 20 may be improved.

One side of the expansion tube 50 in the longitudinal direction is supported on the inner flange 12 of the outer tube 10, and the other side is supported on the outside of the inner tube 20 outside the inner region of the outer tube 10, and the inner tube 20 ) can be stretched when moving. The expansion tube 50 may be formed of a bellows tube.

The pipe connection unit 60 may connect an adjacent inner tube and an outer tube among the plurality of inner tubes 20 and the plurality of outer tubes 10 at a spaced interval therebetween. The pipe connection part 60 may be provided in plurality, and may include a connection body 61 , a leak prevention part 62 , and a body coupling part 63 .

The connection body 61 has a larger diameter than the diameters of the outer tube 10 and the inner tube 20 and can accommodate the outer tube 10 and the inner tube 20 inside. The connection body 61 is provided as a separate pair and may be coupled to each other to have a pipe shape. It is easy to connect the installed inner tube 20 and the outer tube 10 due to the separate connecting body 61 provided as a pair.

The leakage preventing unit 62 may be interposed between the plurality of inner tubes 20 and the connecting body 61 of the plurality of tube connecting portions to prevent steam flowing through the plurality of inner tubes 20 from leaking to the outside. The leak prevention part 62 may have an O-ring shape, and air-tight the inner surface of the connection body 61 and the outer surface of the inner tube 20 in a state accommodated in a receiving groove that may be formed on the inside of the connection body 61 . to prevent steam from leaking. The leak prevention part 62 may be made of various materials.

The main body coupling part 63 is formed in a ring shape from the edge of the connecting body 61 separated into a pair, so that they are easily coupled to each other. The body coupling part 63 may be provided as a coupling hole and may be coupled with a bolt/nut, or may be provided with a clamp. The body coupling part 63 may be provided as a one-touch clamp that can be clamped and released with one touch to facilitate installation.

The fixed coupling portion 70 may be fixedly coupled to one inner tube and one inner tube among the plurality of inner tubes 20 and the corresponding outer tube overlapping in the longitudinal direction with respect to the longitudinal direction. The fixed coupling part 70 may be disposed between adjacent pipe connection parts among the plurality of pipe connection parts. The fixed coupling portion 70 may include an anchor 71 and an anchor support 72 . The fixed coupling part 70 is provided in plurality, and may be provided in at least one pair disposed to face the axis center of the exterior 10 .

The anchor 71 may be welded to the exterior 10 . The anchor 71 may be fixedly coupled to one inner tube and the corresponding outer tube overlapping in the longitudinal direction. The anchor 71 is formed in a disk shape and has an outer diameter similar to the inner diameter of the exterior 10, and is disposed on the inside of the exterior 10 to be welded and fixedly coupled.

The anchor support 72 is welded to the outside of the inner tube and the anchor 71 disposed on the inner side of the outer tube 10 so that the inner tube 20 can be fixedly coupled to the outer tube 10 . One side of the anchor support 72 is fixedly coupled to the outside of one of the plurality of inner tubes 20 , and the other side can be fixedly coupled to both ends of the anchor 71 with the anchor 71 interposed therebetween in the longitudinal direction.

The anchor support 72 may be formed in a plate shape and may have a disk 1/4 shape. The anchor support 72 may be welded to one surface and the rear surface of the anchor 71 by being disposed parallel to the axial direction of the outer surface 10 in the plate direction. The anchor support 72 welded to one surface and the rear surface of the anchor 71 may be disposed on the same line with respect to the axial direction of the exterior 10 . Thereby, the pair of anchor support 72 can support the anchor 71 stably and firmly. Anchor support 72 may be provided in plurality, may not be arranged on the same line with respect to the axial direction of the exterior (10). It is arranged unequal with respect to the axial direction of the exterior 10 and may be provided in plurality to firmly support the anchors 71 .

The vacuum maintenance system 80 of the steam conveying pipe is disposed in the exterior 10 and the inner region of the exterior 10 along the longitudinal direction, and is formed longer than the exterior 10 in the longitudinal direction to transport steam. (20) and the outer side of the inner tube (20) with a predetermined thickness, the steam transfer pipe (1) having a heat insulating material layer (30) disposed at a distance with respect to the inner side of the outer tube (10) to form a heat insulating space vacuum of (1) It is a configuration to maintain the state.

The vacuum maintenance system 80 of the steam transport pipe is airtightly connected to the exterior 10 and discharges air in the insulating space formed by the insulating material layer 30 to form a vacuum state. By creating a vacuum in this way, the heat transfer medium is minimized and the insulation effect is improved. The vacuum maintenance system 80 of the steam transport pipe may include an external airtight connection part 81 , an airtight expansion pipe 82 , a vacuum forming part 83 , and a control unit 84 .

The exterior airtight connection part 81 is airtightly coupled to the end region along the circumferential direction of the exterior surface 10 on one side, and extends longer than the exterior exterior 10 along the longitudinal direction from one side. The external airtight connection part 81 may include an external airtight connection body 811 , a support flange 812 , and an external wave shape part 813 .

The exterior airtight connection body 811 is welded to the end of the exterior 10 so that the insulating space is kept airtight without communicating with the outside.

The support flange 812 is formed to extend from the exterior airtight connection body 811 in a direction away from the exterior 10 axis, so that it can be installed and supported in the manhole 2 . The support flange 812 may be formed to extend in a direction away from the axial center of the exterior 10 from a region along the circumferential direction of the exterior airtight connection body 811 .

The outer corrugated portion 813 may buffer the expansion in the longitudinal direction when the inner tube 20 is thermally expanded.

The airtight expansion pipe 82 is coupled to an end area along the circumferential direction of the other side of the outer airtight connection part 81 and one area along the circumferential direction of the inner tube 20 to form an airtight insulating space, and movement of the inner tube 20 can be expanded upon. Accordingly, even when the inner tube 20 is thermally expanded, the outer tube 10 and the inner tube 20 may not be damaged while thermally expanding in the longitudinal and transverse directions while the insulating space is kept airtight.

At least one of the external airtight connection portion 81 and the airtight expansion pipe 82 may be formed with a section having a waveform shape such that an area in contact with the outside increases.

The vacuum forming part 83 communicates with the heat insulating space through the external airtight connection part 81, and discharges the air of the heat insulating space to the outside so that the heat insulating space becomes a vacuum state. The vacuum forming unit 83 may include a discharge pipe 831 , a discharge valve 832 , a discharge driving unit 833 , a pressure sensing unit 834 , and a temperature sensing unit 835 .

The discharge pipe 831 may communicate with the heat insulation space through the exterior airtight connection part 81 in order to discharge the air of the heat insulation space to the outside.

The discharge valve 832 may be disposed on the discharge pipe 831 to regulate the air flow of the discharge pipe 831 .

The discharge driver 833 is connected to the discharge pipe 831 in communication with it, and may discharge the air in the heat insulation space to the outside. The exhaust driving unit 833 may include a blower fan and a motor, and may be provided with a cylinder and a piston to discharge the air in the heat insulation space to the outside.

The pressure sensing unit 834 may sense the pressure of the insulating space.

The temperature sensing unit 835 may sense the temperature of the insulating space.

The control unit 84 stores the critical pressure of the adiabatic space, and when it is determined that the air pressure sensed by the pressure sensing unit 834 exceeds the critical pressure, the air in the adiabatic space is discharged to the outside so that the pressure of the adiabatic space does not become at least the critical pressure. It is possible to control the discharge valve 832 and the discharge driver 833 to discharge to the

The control unit 84 stores the critical pressure of the adiabatic space, and when it is determined that the temperature sensed by the temperature sensing unit 835 exceeds the preset temperature, the air in the adiabatic space does not become at least the preset temperature. It is possible to control the discharge valve 832 and the discharge driver 833 to discharge to the outside.

1 is an exemplary view of a position where the vacuum maintenance system 80 of the steam transfer pipe is installed.

The vacuum maintenance system 80 of the steam transport pipe discharges the air in the insulating space to the outside of the ground in order to form the insulating space of the steam transport pipe 1 in a vacuum state. To this end, the vacuum maintenance system 80 and the manhole 2 of the steam transfer pipe are required. The manhole 2 is formed underground, and a discharge path connecting the air discharged by the vacuum maintenance system 80 of the steam transfer pipe to the outside of the ground is formed. The vacuum maintenance system 80 of the steam transport pipe is installed in the manhole 2 to discharge the air discharged from the heat insulation space of the steam transport pipe 1 to the outside of the ground.

2 is a simplified exemplary view showing the vacuum maintenance system 80 of the steam transfer pipe.

When it is determined that the atmospheric pressure sensed by the pressure sensing unit 834 exceeds the critical pressure, the control unit 84 includes a discharge valve 832 and The exhaust driver 833 may be controlled. Thereby, it is possible to continuously maintain the vacuum state of the insulating space.

Here, the control unit 84 may determine the steam leakage of the steam conveying pipe 1 in consideration of the driving time, driving current, driving interval, and the like of the discharge driving unit 833 . In addition, the leakage area may be estimated in consideration of the driving time, driving current, and driving interval of the discharge driver 833 . For example, if the driving interval of the exhaust driving unit 833 is shorter than the previous driving interval, the leakage area is estimated to be close, and the pressure drop in the adiabatic space during the driving of the exhaust driving unit 833 is not the preset pressure drop. Steam leakage is determined, and when the driving time of the discharge driving unit 833 up to the critical pressure or less is equal to or less than a preset driving time, steam leakage is determined.

Here, when the degree of pressure drop in the adiabatic space during the driving of the exhaust driver 833 is not the preset pressure drop, the driving time of the exhaust driver 833 up to the critical pressure is less than or equal to the preset driving time, the exhaust driver ( When the driving interval of the 833 is shorter than the previous driving interval, when the temperature of the insulating space is lower than the preset temperature, etc., a current greater than the normal operating current by at least 20% or more may be supplied to the discharge driving unit 833 .

Here, the discharge valve 832 may be formed of a non-return valve that does not allow flow to the adiabatic space while allowing a flow from the adiabatic space to the outside.

6 is an operation diagram in which high-temperature steam flows into the inner tube 20 of the steam transfer pipe 1 and thermally expands in the longitudinal direction.

6 (a) the inner tube 20 of the steam transfer pipe 1 is disposed inside the outer tube 10.

FIG. 6 (b) When steam of 200 to 400° C. is supplied to the inner tube 20, the inner tube thermally expands in the longitudinal and transverse directions. The expansion in the longitudinal direction is mainly made, and since the left side of the inner tube 20 is fixed, the inner tube 20 expands in the longitudinal direction toward the right side of the fixed part. However, the exterior 10 is not expanded because high-temperature steam is not supplied and is positioned as it is. As the inner tube 20 expands in this way, the inner tube support unit 40 moves to the right while supporting the inner tube 20 , and as the rotary ball 42 rolls along the inner surface of the outer tube 10 , thermal expansion occurs naturally.

7 is an operation diagram in which high-temperature steam flows into the inner tube 20 of the steam transfer pipe 1 and the inner tube diameter thermally expands.

7 (a) When steam of 200 ~ 400 ℃ is supplied to the inner tube 20, the inner tube 20 is thermally expanded in the longitudinal and transverse directions. In this case, if the inner tube support unit 40 does not change in length in the longitudinal direction, when the inner tube 20 is thermally expanded in the horizontal direction, the inner tube support unit 40 pushes the outer tube 10 to the outside and may damage the outer tube 10 . have. The inner tube 20 of the steam transfer pipe 1 is disposed inside the outer tube 10 .

7 (b) steam of 200 ~ 400 ℃ is supplied to the inner tube 20 to expand the inner tube 20 in the transverse direction with respect to the longitudinal direction, the rotating ball 42 is the elasticity of the inner tube support column (41) While being accommodated in the pressing unit receiving portion 411, the inner tube support portion 40 buffers the expansion force applied to the outer tube 10 to the outside. As a result, the inner tube support unit 40 pushes the outer tube 10 to the outside so that the outer tube 10 is not damaged.

8 is a view showing a modified example of the inner pipe support column 41 of the steam transport pipe (1).

8 (a), 8 (b), the plurality of inner tube support columns 41 may be arranged in a predetermined range with respect to the longitudinal direction of the inner tube 20, the plurality of inner tube support columns 41 is at least one pair is provided, and at least a pair of inner tube support pillars 41 may be disposed to face the same axial center of the inner tube 20 .

10 is an operation diagram of the end region of the modified steam transport pipe (1).

10 (a) The inner tube 20 of the steam transfer pipe (1) is disposed inside the outer tube (10), the steam does not flow in the inner tube (20). The expansion and contraction tube 50 is welded to the outer tube 10 and the inner tube 20 to airtightly shield the insulating space.

10 (b) steam at 200 ~ 400 ℃ is supplied to the inner tube 20, the inner tube 20 expands in the longitudinal direction, but the expansion and contraction tube 50 is stretched so as not to damage the outer tube 10 and the inner tube 20 .

12 is a cross-sectional view of an example of fixing the inner tube 20 of FIG. 11 .

One side of the anchor support 72 is welded to the plate surface of the anchor 71 at the front and rear ends of the anchor 71 in the longitudinal direction in a state in which the disk-shaped anchor 71 is welded to the inside of the exterior 10 . The other side of the anchor support 72 is welded to the outer surface of the inner tube 20 to be fixedly coupled. Accordingly, the anchor 71 and the anchor support 72 can be fixedly coupled to the outer tube 10 and the inner tube 20 , and become a fixed portion when steam flows into the inner tube 20 . Accordingly, the inner tube 20 is stably fixed to the outer tube 10 , and when steam flows, thermal expansion can be stably performed around the fixed portion.

15 is an exemplary view in which the fixed coupling portion 70 for fixing the inner tube 20 is disposed.

The exterior 10 is in a state in which it is connected by the pipe connection part 60 , and the fixed coupling part 70 fixes the inner tube 2 to the exterior tube 10 at positions A and B, and the exterior to the pipe connection part 60 . (10) and the inner tube (20) are arranged to have a spaced apart, so that when steam is introduced into the inner tube and flows, it can be stably expanded.

The inner tube support portion 40 is formed by being supported by the inner tube 20, but is supported on the inside of the outer tube 10 so that the rotating ball 42 contacts the outer side of the inner tube 20 to expand the inner tube (2). 20) may be allowed to expand without being damaged. When the inner tube support 40 is installed inside the outer tube 10, a rotational movement guide, ie, a groove, may be formed on the outer side of the inner tube 20 to allow the rotary ball 42 to move along the longitudinal direction. In addition, when the inner tube support part 40 is installed on the outside of the inner tube 20, a rotational movement guide, that is, a groove, may be formed on the inner surface of the outer tube 10 to allow the rotary ball 42 to move along the longitudinal direction. have.

On the outside of the inner tube 20, the inner tube support clamp 44 is depressed so as to block the movement in the longitudinal direction of the inner tube 20, a depression coupling portion to be seated and coupled may be formed.

Due to the vacuum maintenance system 80 of the steam transport pipe, it is possible to stably maintain the vacuum state of the insulating space without steam leakage despite the expansion of the inner pipe 20 due to the inflow of high-temperature steam, and When the pressure is sensed and the pressure rises due to the inflow of air, it is possible to maintain the vacuum state of the adiabatic space by discharging the air of the adiabatic space to the outside, thereby preventing a decrease in the thermal efficiency of the steam of the steam conveying pipe.

Although the embodiments of the present invention have been described as specific embodiments, these are merely examples, and the present invention is not limited thereto, and should be construed as having the widest scope according to the basic idea disclosed in the present specification. A person skilled in the art may implement a pattern of a shape not specified by combining/substituting the disclosed embodiments, without departing from the scope of the present invention. In addition, those skilled in the art can easily change or modify the disclosed embodiments based on the present specification, and it is clear that such changes or modifications also fall within the scope of the present invention.

1: Steam transfer pipe 2: Manhole
10: exterior 11: exterior body
12: inner flange
20: inner tube 21: inner tube body
22: protrusion fixing part
30: insulation layer 31: insulation main layer
32: insulation fault
40: inner tube support 41: inner tube support column
411: elastic pressure accommodating portion 412: ball stop portion
42: rotating ball 43: ball elastic pressing part
44: inner tube support clamp 45: fixed pad
50: expansion tube
60: pipe connection part 61: connection body
62: leak prevention part
70: fixed coupling portion 71: anchor
72: anchor support
80: vacuum maintenance system 81: exterior airtight connection part
811: external airtight connection body 812: support flange
813: external wave form part 82: airtight expansion tube
83: vacuum forming unit 831: discharge pipe
832: discharge valve 833: discharge drive unit
834: pressure sensing unit 835: temperature sensing unit
84: control unit

Claims (5)

The outer tube is disposed on the inner region of the outer appearance along the longitudinal direction, and is formed longer than the outer tube along the longitudinal direction and surrounds the outer side of the inner tube and the inner tube capable of transporting steam with a predetermined thickness, and is spaced apart from the inner side of the outer tube. In the vacuum maintenance system of the steam transport pipe having a vacuum holding device for maintaining the vacuum state of the steam transport pipe having a heat insulating material layer disposed at intervals to form an insulating space,
an exterior airtight connection part having one side airtightly coupled to the end region along the circumferential direction of the exterior, and extending longer than the exterior from the one side in the longitudinal direction;
an airtight expansion tube that is coupled to an end region along the circumferential direction of the other side of the outer airtight connection part and a region along the circumferential direction of the inner tube to airtightly form the heat insulating space, and which can be expanded and contracted when the inner tube is moved; and
A vacuum forming part communicating with the insulating space through the external airtight connection part and capable of discharging the air of the insulating space to the outside to be in a vacuum state,
Vacuum maintenance system of steam transfer pipe. The method of claim 1,
The vacuum forming unit,
a discharge pipe communicating with the heat insulation space through the exterior airtight connection part to discharge the air of the heat insulation space to the outside;
a discharge valve disposed on the discharge pipe to regulate the air flow of the discharge pipe; and
The discharge pipe is connected in communication and includes a discharge driver for discharging the air of the insulating space to the outside,
Vacuum maintenance system of steam transfer pipe. 3. The method of claim 2,
The vacuum forming unit,
Further comprising a pressure sensing unit for sensing the pressure of the insulating space,
Stores the critical pressure of the adiabatic space, and when it is determined that the atmospheric pressure sensed by the pressure sensing unit exceeds the critical pressure, the air in the adiabatic space is discharged to the outside so that the pressure in the adiabatic space does not become at least the critical pressure Further comprising a control unit for controlling the discharge valve and the discharge driving unit so as to
Vacuum maintenance system of steam transfer pipe. The method of claim 1,
Further comprising a support flange extending in a direction away from the axial center of the exterior from a region along the circumferential direction of the exterior airtight connection portion,
Vacuum maintenance system of steam transfer pipe. The method of claim 1,
At least one of the external airtight connection part and the airtight expansion pipe,
A section having a shape of a waveform to increase the area in contact with the outside is formed,
Vacuum maintenance system of steam transfer pipe.

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