Valve replacing device for pipeline with pressure

Abstract

The utility model discloses a valve replacement device for a pipeline with pressure, and belongs to the technical field of pipeline valve replacement. A valve replacing device for a pipeline with pressure comprises a fixing pipe with one end extending into the pipeline with pressure and further comprises a tension bar, the tension bar is sleeved with the fixing pipe, a plastic plugging head is detachably arranged at the end, located in the pipeline, of the tension bar through a first nut, and one end of the fixing pipe abuts against the plastic plugging head. The other end of the tension bar is provided with a driving piece used for pushing the fixing pipe to slide, and the fixing pipe and the tension bar are detachably connected with the under-pressure pipeline through fixing parts. The plastic plugging head is arranged at one end of the tension bar, so that the plastic plugging head expands to plug the pipeline, the operation is simple, the plugging device is suitable for plugging the pipeline with smaller diameter or thinner wall thickness, and under the action of the fixing part, the phenomenon that the plugging head is damaged in the process of assembling and disassembling the valve can be avoided. And the fixed pipe or the tension bar generates axial displacement under the pressure of a medium in the pipeline, so that the use safety and reliability are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline valve replacement technical field especially, relates to a valve replacement device of pipeline under pressure. BACKGROUND

[0002] In the pipeline construction of city, often use valve to control the on-off of conveying pipeline. With the increase of valve service life, especially the valve installed on the pressure pipeline, the valve will appear the phenomenon such as valve body erosion, sealing member aging, corrosion and many other serious influences its use function, cause these valves to open or close difficult, sealing member rust, leakage and other problems, therefore need to replace the valve maintenance, because the pipeline inside is generally conveying liquid or gas, to replace these valves, the conventional method is to close the total valve and replace it under the pressureless state, but this will seriously affect the normal use of other users to the pipeline conveying material.

[0003] The traditional pressure blocking technology has limited application range, adopts air bag or welding blocking mode, and it is difficult to block the pipeline with small diameter or thin wall thickness, and the safety and reliability are insufficient when replacing the valve under pressure, and it is difficult to meet the use requirements. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the problems of difficult to block the pipeline with small diameter or thin wall thickness and low safety and reliability in the prior art, and provides a valve replacement device for pipeline under pressure.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A valve replacement device for pipeline under pressure, comprising a fixed pipe extending into the pipeline under pressure at one end, and a tension rod, the fixed pipe is sleeved on the tension rod, one end of the tension rod in the pipeline is provided with a plastic sealing head through a first nut, one end of the fixed pipe abuts against the plastic sealing head, and the other end of the tension rod is provided with a driving piece for sliding the fixed pipe, and the fixed pipe and the tension rod are detachably connected with the pipeline under pressure through a fixed part.

[0007] In order to control the plastic sealing head conveniently, preferably, one end of the tension rod is sleeved with at least two control plates, the plastic sealing head is arranged between the two control plates, one end of the fixed pipe abuts against the outer wall of one of the control plates, and the outer wall of the other control plate abuts against the first nut through a first bearing.

[0008] In order to facilitate the movement of the fixed pipe, further, the driving piece comprises a second nut, the second nut is threadedly connected with the other end of the tension rod, the outer wall of the second nut is sleeved with a control handle, and the other end of the fixed pipe abuts against the second nut through a second bearing.

[0009] In order to guide and support the fixed pipe, preferably, a positioning seat detachably connected with the valve of the pressurized pipeline is further included, a positioning hole in communication with the valve is formed in the positioning seat, and the fixed pipe extends into the pressurized pipeline through the positioning hole.

[0010] Preferably, the fixing part includes a first fixing plate, a second fixing plate and a third fixing plate, the first fixing plate, the second fixing plate and the third fixing plate are all in a semicircular structure, the first fixing plate is fixedly arranged on the outer wall of the pressurized pipeline, the third fixing plate is fixedly arranged on the outer wall of the tension rod, and the third fixing plate is detachably connected with the first fixing plate through a plurality of first screw rods.

[0011] Further, the second fixing plate is fixedly arranged on the outer wall of the fixed pipe, and the second fixing plate is detachably connected with the first fixing plate through a plurality of second screw rods.

[0012] Compared with the prior art, the valve replacement device for the pressurized pipeline has the following beneficial effects:

[0013] 1. The valve replacement device for the pressurized pipeline, by sleeving the fixed pipe on the tension rod, sequentially arranging the control plate, the plastic sealing head, the control plate and the first nut at one end of the tension rod, inserting them into the pressurized pipeline, and then pushing the fixed pipe to drive the control plate to extrude the plastic sealing head to expand and realize the sealing of the pipeline, the operation is simple, and the device is suitable for sealing the pipeline with a small diameter or a thin wall thickness, and under the action of the fixing part, axial displacement of the fixed pipe or the tension rod under the pressure of the medium in the pipeline during the mounting and dismounting of the valve can be avoided, and the use safety and reliability are improved.

[0014] 2. The valve replacement device for the pressurized pipeline, by fixedly arranging the first fixing plate on the pipeline, and then alternately fixing the tension rod and the fixed pipe by using the third fixing plate and the second fixing plate, axial displacement of the fixed pipe and the tension rod under the pressure of the medium in the pipeline during the mounting and dismounting of the valve can be reduced, and the use safety and reliability are improved.

[0015] The parts not involved in the device are the same as or can be realized by the prior art, the valve replacement device for the pressurized pipeline, by sleeving the fixed pipe on the tension rod, arranging the plastic sealing head at one end of the tension rod, and expanding the plastic sealing head to realize the sealing of the pipeline, the operation is simple, and the device is suitable for sealing the pipeline with a small diameter or a thin wall thickness, and under the action of the fixing part, axial displacement of the fixed pipe or the tension rod under the pressure of the medium in the pipeline during the mounting and dismounting of the valve can be avoided, and the use safety and reliability are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1The utility model provides a valve replacement device of pressure pipeline's structure diagram Figure 1 ;

[0017] Figure 2 The utility model provides a valve replacement device of pressure pipeline's plan view;

[0018] Figure 3 The utility model provides a valve replacement device of pressure pipeline's structure diagram Figure 2 ;

[0019] Figure 4 The utility model provides a valve replacement device of pressure pipeline's sectional view;

[0020] Figure 5 The utility model provides a valve replacement device of pressure pipeline's explosion view.

[0021] In the drawing: 1, first fixed plate;2, second fixed plate;3, third fixed plate;4, positioning seat;5, fixed pipe;6, tension rod;7, plasticity block head;8, control board;9, control handle;10, first screw;11, second screw;12, first bearing;13, second bearing;14, first nut;15, second nut. Specific embodiments

[0022] The technical scheme in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0023] In the description of the utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0024] Embodiment

[0025] Reference Figures 1-5The utility model provides a valve replacement device of a pressurized pipeline, which comprises a fixed pipe 5 extending into the pressurized pipeline at one end, wherein the fixed pipe 5 is a hollow structure, preferably a seamless steel pipe; a tension rod 6, wherein the fixed pipe 5 is sleeved on the tension rod 6; a plastic sealing head 7, which is detachably arranged on one end of the tension rod 6 in the pipeline by a first nut 14; the plastic sealing head 7 is made of polytetrafluoroethylene and has good high-temperature resistance, corrosion resistance and sealing performance; the plastic sealing head 7 is cylindrical in shape and slightly longer than the inner diameter of the pressurized pipeline to ensure that the pipeline can be completely sealed; the Shore hardness of the polytetrafluoroethylene is 45-55A, which can resist medium pressure; and a driving member is arranged on the other end of the tension rod 6 to push the fixed pipe 5 to slide, so that the fixed pipe 5 can extrude the plastic sealing head 7 to expand and seal the pressurized pipeline; and the fixed pipe 5 and the tension rod 6 are detachably connected to the pressurized pipeline through a fixing part during use, so that the fixed pipe 5 or the tension rod 6 can axially displace under the pressure of the medium in the pipeline during the installation and removal of the valve, thereby affecting normal use.

[0026] In use, the fixed pipe 5 is sleeved on the tension rod 6, the control plate 8, the plastic sealing head 7, the control plate 8 and the first nut 14 are sequentially arranged at one end of the tension rod 6, and the fixed pipe 5 is inserted into the pressurized pipeline, and then the fixed pipe 5 is pushed to drive the control plate 8 to extrude the plastic sealing head 7 to expand and seal the pipeline, so that the operation is simple and the pipeline with a small diameter or a thin wall thickness can be sealed; and under the action of the fixing part, the fixed pipe 5 or the tension rod 6 can axially displace under the pressure of the medium in the pipeline during the installation and removal of the valve, thereby improving the safety and reliability in use.

[0027] Reference Figure 4 and Figure 5At one end of the tension rod 6, at least two control plates 8 are sleeved, and here we prefer two, the control plate 8 is a square structure, the diagonal line is smaller than the outer diameter of the fixed tube 5 and larger than the inner diameter, the plastic sealing head 7 is arranged between the two control plates 8, and the outer wall of one of the control plates 8 is abutted with one end of the fixed tube 5, and the outer wall of the other control plate 8 is abutted with the first nut 14 through the first bearing 12, the first bearing 12 and the second bearing 13 are preferably thrust bearings, the outer diameter of the first bearing 12 and the second bearing 13 is smaller than the outer diameter of the fixed tube 5, the first bearing 12 is arranged between the control plate 8 and the first nut 14, and the fixed tube 5 may be rotated during sliding. When the fixed tube 5 is driven to slide, the first bearing 12 can reduce the rotation of the first nut 14 through the control plate 8 and the plastic sealing head 7 when the fixed tube 5 rotates, and reduce the possibility of the first nut 14 falling off from the tension rod 6. In order to further improve the relaxation effect, two groups of first nuts 14 can be used for fixation.

[0028] Referring to Figure 4 And Figure 5 Here, the driving member includes the second nut 15, the second nut 15 is threadedly connected with the other end of the tension rod 6, and the control handle 9 is sleeved on the outer wall of the second nut 15, and here the control handle 9 is provided with an inner hole matched with the shape of the second nut 15, in use, the control handle 9 is sleeved on the outer wall of the second nut 15, and when the control handle 9 is rotated, the second nut 15 is driven to rotate, the other end of the fixed tube 5 is abutted with the second nut 15 through the second bearing 13, and the second bearing 13 is arranged between the second nut 15 and the fixed tube 5, which can reduce the rotation of the fixed tube 5 when the second nut 15 is rotated, in use, the second nut 15 is rotated on the tension rod 6 by the control handle 9, which can push the fixed tube 5 to extrude the control plate 8, and then the plastic sealing head 7 is extruded between the two control plates 8, the plastic sealing head 7 expands to realize the sealing of the inner wall of the pipeline.

[0029] Referring to Figures 3-5 It also includes a positioning seat 4 detachably connected with the valve of the pressurized pipeline, here we prefer to use bolts to detachably connect the positioning seat 4 with the flange on the valve, and a rubber pad is arranged at the connection between the positioning seat 4 and the flange on the valve to improve the sealing effect, a positioning hole is formed in the positioning seat 4 and communicates with the valve, the diameter of the positioning hole matches the outer diameter of the fixed tube 5, and the fixed tube 5 extends into the pressurized pipeline through the positioning hole, in use, the positioning seat 4 is arranged on the valve to guide and support the fixed tube 5, so that the axis of the fixed tube 5 coincides with the axis of the pipeline as much as possible.

[0030] Referring to Figures 1-3Here, the fixing part is designed as a first fixing plate 1, a second fixing plate 2, and a third fixing plate 3. Each of these plates has a two-semi-circular structure, with the two semi-circular surfaces connected by bolts. Each of these plates has a central hole, and a high-temperature resistant rubber pad is fixed to the inner wall of the central hole to increase friction, prevent slippage, and protect the surfaces of the pipe, the fixing pipe 5, and the tension rod 6. The first fixing plate 1 is fixed to the outer wall of the pressurized pipe. Here, the first fixing plate 1 is fixed to the front end of the valve along the direction of medium flow, and the third fixing plate 3 is fixed to the outer wall of the tension rod 6. The third fixing plate 3 is also fixed to the outer wall of the tension rod 6. The first fixing plates 1 are connected and detached by multiple first screws 10. There are two to eight sets of first screws 10; here, we prefer four sets. In use, after fixing the first fixing plates 1 to the outer wall of the pipe and connecting the positioning seat 4 to the valve, the tension rod 6 and the fixing tube 5 are inserted into the pipe, and the plastic sealing head 7 expands to seal the inside of the pipe. Next, the third fixing plate 3 is fixed to the outer wall of the tension rod 6, and then the first screws 10 are used to fix the third fixing plate 3 to the first fixing plate 1. At this point, the connection between the valve and the pipe can be disassembled. After disassembly, the valve is slid a certain distance towards the third fixing plate 3, exposing the fixing tube 5 between the valve and the pipe. Then, the second fixing plate 2 is fixed... The fixing plate 2 is fixed on the outer wall of the fixing pipe 5, that is, on the fixing pipe 5 between the valve and the pipeline. Then, the second fixing plate 2 is detached and connected to the first fixing plate 1 by multiple second screws 11. There are two to eight sets of second screws 11. Here, we prefer four sets to fix the fixing pipe 5. After the fixing pipe 5 is fixed by the second fixing plate 2, the third fixing plate 3 is removed from the first fixing plate 1 and the tension rod 6, and the control handle 9 is removed from the second nut 15. At this time, the old valve can be removed from the fixing pipe 5 and the tension rod 6, the new valve is put on the fixing pipe 5, and the positioning seat 4 is installed on the new valve. The new valve is pushed close to the second fixing plate 2. After being pushed into place, the third fixing plate 3 is repositioned. The first fixing plate 1 is fixed to the tension rod 6 and connected to the first fixing plate 1 using the first screw 10 to fix the tension rod 6. After fixing, the second fixing plate 2 is removed from the fixing pipe 5 and the first fixing plate 1. At this time, the new valve can be installed on the pipeline. After the new valve is installed, the third fixing plate 3 is removed, and the tension rod 6 and the fixing pipe 5 are pulled out of the pipeline. Then the new valve is closed to complete the replacement. By fixing the first fixing plate 1 on the pipeline and then using the third fixing plate 3 and the second fixing plate 2 to fix the tension rod 6 and the fixing pipe 5 alternately, the axial displacement of the fixing pipe 5 and the tension rod 6 under the pressure of the medium in the pipeline can be reduced when installing and removing the valve, thereby improving the safety and reliability of use.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A valve replacement device for a pressurized pipeline, comprising a fixed pipe (5) extending at one end into the pressurized pipeline, characterized in that, It also includes a tension rod (6), the fixing tube (5) is sleeved on the tension rod (6), and a plastic plug head (7) is detachably installed on one end of the tension rod (6) located inside the pipe through a first nut (14). One end of the fixing tube (5) abuts against the plastic plug head (7), and the other end of the tension rod (6) is provided with a driving component for pushing the fixing tube (5) to slide. Both the fixing tube (5) and the tension rod (6) are detachably connected to the pressurized pipe through a fixing part.

2. The valve replacement device for a pressurized pipeline according to claim 1, characterized in that, At least two control plates (8) are sleeved on one end of the tension rod (6), the plastic sealing head (7) is set between the two sets of control plates (8), and one end of the fixing tube (5) abuts against the outer wall of one of the control plates (8), while the outer wall of the other control plate (8) abuts against the first nut (14) through the first bearing (12).

3. A valve replacement device for a pressurized pipeline according to claim 2, characterized in that, The driving component includes a second nut (15), which is threaded to the other end of the tension rod (6), and a control handle (9) is sleeved on the outer wall of the second nut (15). The other end of the fixing tube (5) abuts against the second nut (15) through a second bearing (13).

4. A valve replacement device for a pressurized pipeline according to claim 1, characterized in that, It also includes a positioning seat (4) that is detachably connected to the valve of the pressurized pipeline. The positioning seat (4) has a positioning hole that communicates with the inside of the valve. The fixing pipe (5) extends into the pressurized pipeline through the positioning hole.

5. A valve replacement device for a pressurized pipeline according to claim 1, characterized in that, The fixing part includes a first fixing plate (1), a second fixing plate (2) and a third fixing plate (3). The first fixing plate (1), the second fixing plate (2) and the third fixing plate (3) are all in the form of two semi-circular structures. The first fixing plate (1) is fixedly installed on the outer wall of the pressurized pipe. The third fixing plate (3) is fixedly installed on the outer wall of the tension rod (6). The third fixing plate (3) and the first fixing plate (1) are detachably connected by multiple first screws (10).

6. A valve replacement device for a pressurized pipeline according to claim 5, characterized in that, The second fixing plate (2) is fixedly installed on the outer wall of the fixing tube (5), and the second fixing plate (2) and the first fixing plate (1) are detachably connected by multiple second screws (11).

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