CN214981535U - PE pipeline switcher - Google Patents

Abstract

The utility model provides a PE pipeline switch, include: a housing installed perpendicular to an outer surface of the PE pipe; the lifting platform moves in the shell along the normal direction of the surface of the PE pipeline; the plurality of tapping knives are movably arranged on the lifting platform; the plugging device is detachably arranged on the lifting platform and comprises a PE material; and the heating wire is positioned in at least one tapping knife and/or the stopper and is used for fusing the stopper and the PE pipeline together. According to the utility model discloses pipeline switch realizes not stepping down and carries out trompil work, changes traditional defeated, step-down, diffuses, uses open fire's operation mode, reduces economic loss and to the harmful effects of environment to can avoid night work, reduce the input of manpower, material resources, improve work efficiency, reduce intensity of labour and consumption, avoid the operation risk, improve the security.

Description

PE pipeline switcher

Technical Field

The utility model relates to a pipeline laying field especially relates to a switch that is used for PE pipeline especially PE pipeline for gas.

Background

With the continuous development of polymer material science, China has revolutionized the field of pipelines by replacing steel with plastic, and Polyethylene (PE) pipelines have the advantages of convenient construction, low engineering cost (DN300), no corrosion leakage, small pollution to transported substances and the like, and are widely applied to urban pipe networks in recent years, in particular to gas pipe networks and tap water pipe networks.

In general, during the process of modification or maintenance and repair of a PE pipeline, the transportation and then operation are usually stopped, even if the operation method of emptying natural gas in the pipeline is not adopted, the pressure of the transported gas in the pipeline is reduced to a safe range during operation, and the operation is performed after temporary plugging by using a gas barrier bag, so as to ensure the safe completion of the modification operation. Whether the operation method of emptying or reducing the pressure of the pipeline is adopted, resource waste and environmental pollution are caused, and the normal production and life of downstream users are influenced. In the case of the call of Haohote, the production department of the medium-burning city gas development Limited company currently has a large number of PE pipelines, and if the work of joint or pipeline transformation and the like is carried out at reduced pressure, the time is wasted and unknown problems are brought.

Therefore, the demand for the double-sealing and double-plugging technology of the PE pipeline is more and more urgent.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model aims to overcome above technical problem, improve PE pipeline and switch efficiency and security.

The utility model provides a PE pipeline switch, include:

a housing installed perpendicular to an outer surface of the PE pipe;

the lifting platform moves in the shell along the normal direction of the surface of the PE pipeline;

the plurality of tapping knives are movably arranged on the lifting platform;

the plugging device is detachably arranged on the lifting platform and comprises a PE material;

and the heating wire is positioned in at least one tapping knife and/or the stopper and is used for fusing the stopper and the PE pipeline together.

Wherein, a plurality of trompil sword is equidistant on the periphery of circular revolving stage, and can change the position along the revolving stage radial.

Wherein, the installation position of the stopper is between two adjacent trompil cutters.

Wherein, the lifting platform is connected with the shell through a screw or a cylinder.

Wherein the driving of the lifting platform is operated by manual operation or by a processor cooperating with a sensor to drive a motor.

Wherein, the sensor is a capacitance sensor and is used for measuring the relative position of the tapping knife and the PE pipeline.

The plugging device comprises an upper first part and a lower second part, the first part is a flat plate and penetrates through the lifting table, and the width of the upper part of the second part is smaller than that of the lower part of the second part.

Wherein the second portion includes a first side that is flat and a second side that includes a curved surface.

Wherein, the shell is provided with a cleaning port for sucking out cutting waste in the hole opening process.

Wherein the bottom surface of the stopper has a plurality of notches or frustums to increase the contact area.

According to the utility model discloses pipeline switch realizes not stepping down and carries out trompil work, changes traditional defeated, step-down, diffuses, uses open fire's operation mode, reduces economic loss and to the harmful effects of environment to can avoid night work, reduce the input of manpower, material resources, improve work efficiency, reduce intensity of labour and consumption, avoid the operation risk, improve the security.

Drawings

The technical solution of the present invention is explained in detail below with reference to the accompanying drawings, in which:

fig. 1 is a conceptual diagram of pipe switching according to an embodiment of the present invention;

FIG. 2 shows an enlarged view of a portion of the pipe switch shown in FIG. 1;

FIG. 3 shows a top plan view of the lift table shown in FIG. 1; and

figure 4 shows an enlarged view of the occluding device shown in figure 2.

Detailed Description

The features and technical effects of the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and exemplary embodiments, which disclose a PE pipe switcher capable of improving switching efficiency and safety. It is noted that like reference numerals refer to like structures and that the terms "first", "second", "upper", "lower", and the like as used herein may be used to modify various structures. These modifications do not imply a spatial, sequential, or hierarchical relationship to the structures being modified unless specifically stated.

As shown in fig. 1, on the premise that the pipeline does not stop conveying media, does not reduce pressure, and ensures normal operation of the pipeline, in order to be mainly applied to connecting branch lines to a gas pipeline network, replacing valves, pipelines, and improving pipelines, and to be suitable for construction work of an urban PE gas pipeline, the pipeline switcher of the preferred embodiment is applied to a joint of an old pipeline and a new pipeline, as shown by a dotted line frame in fig. 1. Generally, the number of elbows near the pipeline plugging part is large, and the selection of the plugging part is very important, so the installation position of the pipeline switcher is selected on the straight pipe section of the old pipeline. During construction, the pipe switcher firstly punches a hole on the old pipe and cuts the hole, and then plugs a plugging device (shown by a shaded part in figure 1) into the old pipe and is jointed with the new pipe, so that the PE pipe switching is realized under the condition of no air interruption or no air pressure reduction.

Specifically, referring to fig. 2, a specific configuration of the PE pipe switcher is shown. The pipe switch includes a housing or frame, typically made of a metallic material such as stainless steel, to enhance support strength and to avoid shifting. Although fig. 2 shows the pipe switcher installed above the old pipe, the orientation in the actual construction process is not limited to the upward direction in the gravity direction, but may be installed on the lower side, left and right sides, or other angles on the circumference of the old pipe as long as the housing of the pipe switcher is perpendicular to the surface of the old pipe. The lifting platform is connected with the shell through a screw or a cylinder and can move in the normal direction of the surface of the old pipeline in the internal working space wrapped by the shell, so that the tapping knife and the plugging device can move in or out of the old pipeline.

As shown in fig. 3, at least one tapping knife is detachably and movably mounted on the outer edge of the lifting platform, for example, two, three, four, six or more tapping knives, preferably equally spaced on the outer edge of the circular rotating platform. In a preferred embodiment, the nominal diameter phi 110-phi 200mm of the new pipeline to be perforated or switched, the temperature of a medium in the pipeline is-10-40 ℃, the pressure of the medium is less than 0.4MPa, the bottom of the perforating knife is detachably fixed with the rotary table, is arranged in a mounting groove on the rotary table through a bolt or a buckle, for example, and can be changed in the radial position in the mounting groove, so that the distance between the perforating knife and the new pipeline diameter is larger than or equal to the diameter of the new pipeline, and the tip or the edge of the perforating knife points to the inner center of the old pipeline. During construction, the lifting platform drives the rotating platform to move towards the radius direction of the old pipeline, and the rotating platform drives the tapping knife to rotate to cut the PE pipeline until the PE pipeline penetrates into the old pipeline. The driving of the elevating table, the rotating table, may be manually operated by a constructor, or operated by a processor in cooperation with a sensor to drive a motor (not shown). The sensor is, for example, a capacitive sensor (not shown) for measuring a change in capacitance of the space near the tapping knife tip in order to determine the tapping knife tip position, e.g., just cutting into the outer pipe wall, entering the inside of the old pipe, just touching the inner pipe wall, etc., to automatically control the start and end times of the cutting tapping action. The aperture cutter is constructed of a hard and thermally conductive material, including metals such as manganese steel, or ceramics such as SiC, AlN, etc. Preferably, at least one of the perforating knives is provided with heating wires on the inside or surface thereof, so that power can be drawn from the elevating platform to heat the surrounding material.

The stopper is removably mounted on the elevator table (e.g., mounted with the tapping knife before tapping, or mounted after the tapping knife is raised after tapping), and moves with the tapping knife. The mounting position of the plugging device is arranged on the periphery of the outer side of the rotating platform and between the mounting grooves of the two adjacent hole opening cutters. The stopper is mainly made of the same or similar material as the tubing, e.g. both PE. In a preferred embodiment, the inner core of the stopper is made of medium density pe (mdpe) or high density pe (hdpe) material for increased stiffness and the outer surface is made of Low Density Pe (LDPE), ultra low density pe (lldpe), metallocene LDPE, bimodal LDPE, other materials such as elastomers, porous materials for increased bonding. As shown in fig. 2, the occluding device includes a first portion at the top and a second portion at the bottom. The first part is a horizontal sheet structure and passes through the plugging groove shown in figure 3 to be fixed on the lifting platform to move together. The second portion is of a narrow-top-wide configuration comprising a vertical first side facing the side of the old pipeline to be plugged and a curved second side facing the side of the new pipeline to be accessed, the bottom of the second portion although shown in figure 2 as being straight in effect following the inner wall of the old pipeline but being cylindrical. Although the upper width of the second part is shown in fig. 2 to be narrower than that of the tapping knife, the width can be flexibly adjusted according to the diameter, pressure and other parameters of the pipeline to be switched in the actual construction process. The curvature of the second side of the second portion may be set according to the pressure in the pipe, such as a cylindrical surface, a spherical surface, an ellipsoidal surface, etc., or may be a polyhedron combining a flat surface and a curved surface. Only four mounting grooves and one plugging groove are shown in fig. 3, but the actual number may be set differently according to construction requirements.

Preferably, the lower part of the first and/or second part of the occluder has a second heating filament (not shown) which cooperates with the heating filament of the tapping knife. In the construction process, after or while the tapping knife cuts out the tapping, the plugging device goes deep into the old pipeline and abuts against the inner wall of the pipeline, and the heating wires and/or the second heating wires apply heat to the plugging device. At this time, the tapping knife moves out of the pipe along with the lifting table, only the plugging device is left, and the plugging device (particularly the second part) mainly made of PE material is welded with the PE pipe, so that the old pipe is completely plugged, and the gas is guided to a new pipe through the second side surface of the plugging device. Preferably, the first portion is also heated together, and after the tapping knife is removed and before the PE material is completely cooled, the first portion overlaps the outer wall of the pipe at one end and is connected to the second portion at the other end to further enhance the bonding force. Because the plugging device is installed on the switch together with the trompil sword, need not to punch after expose the incision totally in order to change equipment, also need not to adopt flame heating to burn and melt PE pipeline, consequently can realize not stepping down, incessantly defeated gas's operation mode, reduce economic loss and the harmful effects to the environment to can avoid night work, reduce the input of manpower, material resources, improve work efficiency, reduce intensity of labour and consumption, avoid the operation risk, improve the security.

Optionally, as shown in fig. 4, the bottom surface of the second part of the stopper has a plurality of notches or a plurality of frustums to increase the contact area between the stopper and the inner wall of the pipe and enhance the bonding strength. Preferably, the frustum is made of a material having a hardness or melting point lower than that of the stopper body, such as Low Density Pe (LDPE), ultra low density pe (lldpe), metallocene LDPE, bimodal LDPE, other materials such as elastomers, porous materials, so that the flow spreads around during welding to fill possible gaps. Preferably, the size of the recess or frustum increases gradually in the direction of extension of the old conduit to match the curvature of the second side of the second part of the occluder to reduce stress.

Further preferably, as shown in fig. 2, a purge port is provided in the pipe switch housing for sucking out cutting waste during the hole opening process to prevent PE debris from clogging the pipe.

According to the utility model discloses pipeline switch realizes not stepping down and carries out trompil work, changes traditional defeated, step-down, diffuses, uses open fire's operation mode, reduces economic loss and to the harmful effects of environment to can avoid night work, reduce the input of manpower, material resources, improve work efficiency, reduce intensity of labour and consumption, avoid the operation risk, improve the security.

While the invention has been described with reference to one or more exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the disclosed system architecture and method of manufacture will include all embodiments falling within the scope of the invention.

Claims (10)

1. A PE pipeline switching device comprises a shell which is arranged perpendicular to the outer surface of a PE pipeline, a lifting platform which moves in the shell along the normal direction of the surface of the PE pipeline, and a plurality of tapping knives which are movably arranged on the lifting platform, wherein a plugging device which comprises PE material is detachably arranged on the lifting platform, and heating wires are arranged in at least one tapping knife and/or the plugging device and are used for welding the plugging device and the PE pipeline together.

2. The PE pipe switch of claim 1, wherein the plurality of tapping knives are equally spaced around the circumference of the circular turntable and are capable of varying positions along the radial direction of the turntable.

3. The PE pipe switch of claim 1 wherein the stopper is mounted between two adjacent tapping knives.

4. The PE pipe switch of claim 1, wherein the elevating platform is connected to the housing by a screw or a cylinder.

5. The PE pipe switch of claim 1, wherein the drive of the elevator table is operated manually or by a processor driving a motor in cooperation with a sensor.

6. The PE pipe switch of claim 5, wherein the sensor is a capacitive sensor for measuring the relative position of the tapping knife and the PE pipe.

7. The PE pipe switch of claim 1 wherein the stopper includes an upper first portion and a lower second portion, the first portion being in the form of a flat plate passing through the elevator platform, the second portion having an upper width less than a lower width.

8. The PE pipe switch of claim 7, wherein the second portion includes a first side that is flat and a second side that includes a curved surface.

9. The PE pipe switch of claim 1, wherein a scavenge port is provided in the housing for suctioning cutting waste during the aperturing process.

10. The PE pipe switch of claim 1 wherein the bottom surface of the stopper has a plurality of notches or frustums to increase contact area.

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