WO2018023819A1

WO2018023819A1 - Method for coating foaming agent or foaming sealant within pipeline

Info

Publication number: WO2018023819A1
Application number: PCT/CN2016/094085
Authority: WO
Inventors: 赵龙
Original assignee: 深圳朝伟达科技有限公司
Priority date: 2016-08-04
Filing date: 2016-08-09
Publication date: 2018-02-08
Also published as: CN106040568A

Abstract

A method for coating a foaming agent or a foaming sealant within a pipeline, comprising the following steps: (1) a foaming sealant (S') and a gas are collected by a reduction vessel (12), which then pass through a hose (10) connected to a faucet and arrive at an end of the pipeline to be coated; (2) after a period of time, a valve (13) is shut down so as to deliver only gas, other particles passing through the center of the pipeline are used to dry and cure a sealant attached to an inner surface; (4) the foaming sealant (S') is distributed helically around a net or on an outer surface of a porous element (6c), the foaming sealant (S') is drawn into and passes through a slit (6d) by means of the gas inside the net or the axial porous member (6c). The coating method meets the requirements of high speed, large width and high precision for coating, reduces equipment costs, and greatly reduces the amount of foaming agent or foaming sealant used while allowing the foaming agent or foaming sealant to dry and cure quickly. Thus, jobs may be executed more effectively and economically.

Description

In-line foaming agent or foaming sealant coating method

Technical field

The present invention relates to a method of pipe coating, and more particularly to a method of applying a blowing agent or a foaming sealant in a pipe.

Background technique

Applying various coatings on the base layer to form a composite coating product is widely used. Coatings can also be obtained in a variety of ways, such as roll engraving, spraying, knife coating, vapor deposition, casting, dipping, etc., used to make different products to meet different needs and meet various precision requirements. Spray spraying method is often used for spraying liquid paint on paper, cloth, etc., suitable for high-speed, large-width, medium-precision coating requirements, and spraying a specific foaming agent or foaming sealant on the inner wall of the pipeline because Regarding the requirements of safe production and operation, the requirements for precision are higher. At present, the pipeline coating machines used in China are imported from Germany and Italy. They do not transfer the manufacturing technology of coating machines, thus restricting the high-precision pipelines in China. The improvement and development of sealant coating machine manufacturing technology has affected the development of a series of industries related to pipe sealing. Under the premise that the domestic manufacturing technology level is relatively low, there is a need for a large-scale wide-precision foaming agent or a foaming sealant coating method, which can save foreign exchange and improve the level of China's pipeline industry. Increasing economic benefits has far-reaching effects.

Summary of the invention

It is an object of the present invention to provide an in-line foaming agent or a foaming sealant coating method, the coating machine used in the coating method comprising an air compressor, a pressure regulating valve, an upstream flow rate adjuster and a downstream flow rate adjuster, and Injectors and barometers, air compressors are used to compress and supply gas, pressure adjustment valves are used to properly adjust the pressure of the gas, and flow rate regulators are used to provide appropriate flow to provide annular flow conditions for direct delivery of the injector through the upstream The gas of the flow controller, the gas flowing through the downstream flow controller is sent to the nozzle of the device, thereby causing the sealant to foam, and the foam sealant is directly introduced into the spray device, and the coating method comprises the following steps: (1) foaming Sealant and gas flowing through the pipe Collected by the reduction vessel and passed through the hose connected to the faucet to the end of the pipeline to be coated. In the vessel, the liquid and the gas are separated from each other, only the gas is discharged to the outside, and the sealant is collected; After a predetermined period of time, the valve is closed, the gas is only transferred in the pipeline, and the sealant attached to the inner surface of the pipe is quickly dried and solidified by other particles passing through the center of the pipeline; (4) the upgrade device makes the foam sealant Spirally distributed on the outer periphery of the mesh or on the outer surface of the porous member in the axial direction, and by passing through the mesh or the gas inside the axially porous member, the foamed sealant is drawn in and passed through the slit to provide an annular flow condition.

Preferably, the annular flow is a circulating state in which a main portion of the blowing agent or the foaming sealant exhibits a state of a cylindrical layer flowing along the inner surface of the pipe, and the gas flows in the center of the pipe, and the flow of the gas The process also includes a blowing agent that floats in the gas layer or a fine particle of the foaming sealant.

Preferably, the operation performed simultaneously with the coating method is to infiltrate the sealant into the joint portion where the gas easily leaks, and permeate the sealant of the wall surface to the line, and any excess sealant may be discharged in synchronization with the supply time.

Preferably, for tubes with a diameter of 2.5 cm and a length of 7.5 m, the loading and discharging of the sealant takes only 0.7 hours, and the consumption of liquid sealant requires only 4.1 liters, passing through the upstream flow rate controller (4) and downstream flow rate control. The amount of gas in the device (5) was 190 liters/min and 20 liters/min, respectively, and the pressure measured by the barometer (9) was 0.2 kg/cm ² .

Preferably, the coating method is suitable for a foam sealant or a liquid sealant.

Preferably, when the coating method uses a liquid encapsulant with compressed air, the liquid encapsulant acts as a carrier gas to form a gas-liquid mixed stream, and the gas-liquid mixed stream flows in the existing pipeline at a very high speed. Thereby providing a circulation therein, the circulation will coat the inner surface of the pipeline, especially some grooves and defective portions. As the velocity of the gas-liquid mixed flow increases, first the liquid sealant and the gas are respectively in the lower part of the pipeline and The upper part flows to form a laminar flow, then the liquid sealant flows along the inner surface of the pipe, and the gas flows at a high speed along the center of the pipe to form an annular flow. Finally, the main part of the sealant flows under the spray condition. Thereby forming a jet stream.

Preferably, the applicator is further provided with an air supply fan (23) and an air discharge fan (24) connected to the pipe having the annular turning portion, the two ends of the pipe are closed by the valve, and the tank body and the mixer are also provided, and the tank body is The mixer provides a liquid encapsulant that forms a gas-liquid mixture that flows with the carrier gas supplied from the air supply fan and the air discharge fan, the gas-liquid mixture flowing at a sufficiently high speed within the conduit to provide an annular flow, The sealant collects in the groove portion, in the holes, in the crack, or in the rough portion of the pipe.

Preferably, after coating, the pipe is subjected to a sealing treatment and a smoothing treatment, and the excess sealant is collected by a gas-liquid separator placed at the end of the discharge line, respectively, or recycled by a mixer.

Preferably, for the large-diameter gas main pipe buried in the ground, the coating method is used for sealing the main gas of the repair gas, and further includes: (1) the coaxial or near-coaxial insertion outer diameter of the main pipe is slightly smaller than the inner diameter of the main pipe. (2) supplying the foaming sealant to the cylindrical space between the gas main pipe and the pipe; (3) introducing the gas into the cylindrical space to discharge excess sealant, disassembling the pipe for cleaning, and allowing Dry and cure the cylindrical sealant that remains in the main gas line.

Preferably, the coating machine omits the spraying device and uses an elastic tube at the position of the pipe.

Preferably, the leak test is performed on the pipeline before the inner surface of the pipeline is subjected to a sealing treatment to measure the leak degree. If the test indicates that the leak degree is higher than a predetermined value, the lining treatment is performed together with the coating method on the sealant coating. A cylindrical film is then provided to further prevent leakage.

Preferably, in the lining treatment, the adhesive is used for treatment, the adhesive layer is formed in a cylindrical shape on the inner surface of the axial tube, and then the cylindrical film is inserted, and the film is adhered to the cylindrical adhesive layer. The inner surface.

Preferably, the cylindrical film is inserted using an ingot method, after the adhesive layer is formed, the end of the guide wire member is used to tie the cylindrical film before being inserted into the pipe, and then the cylindrical film is inserted by pulling the guide wire member Into the pipeline.

Preferably, the coating method is applicable to gas pipes, water pipes or cable lines.

The coating method technology provided by the invention can meet the requirements of high-speed, large-width and medium-precision spraying of a specific foaming agent or a foaming sealant on the inner wall of the pipeline, thereby improving production efficiency and reducing equipment formation. The required amount of blowing agent or foaming seal is greatly reduced, and the drying and curing of the sealant can be faster, thereby making the repair work more efficient and economical.

The above as well as other objects, advantages and features of the present invention will become apparent to those skilled in the <

DRAWINGS

Some specific embodiments of the present invention are described in detail below by way of example, and not limitation. The same reference numbers in the drawings identify the same or similar parts. Those skilled in the art should understand that the drawings are not necessarily drawn to scale. The objects and features of the present invention will become more apparent in consideration of the following description in conjunction with the accompanying drawings.

Figure 1 shows a schematic diagram of a pipeline system according to a first embodiment

Figure 2 is a front elevational view of the elbow portion of the pipeline system in accordance with the practice of the present invention, wherein the means for dissipating the components is displayed;

Figure 3 is a vertical sectional view showing another embodiment of the coating method;

Figure 4 is a cross-sectional view taken along line VII-VII of Figure 3;

5A to 5C are cross-sectional views for explaining a second embodiment of the present invention;

Figure 6 is a schematic diagram of a pipeline system according to a second embodiment;

Figure 7 is a cross-sectional view of the main body portion of Figure 6;

Figure 8 is a cross-sectional view showing a third embodiment of the present invention;

Figure 9 is a cross-sectional view showing a fourth embodiment of the present invention;

Figure 10 is a cross-sectional view showing a pipeline used in a fourth embodiment of the present invention.

detailed description

In Fig. 1, the coating machine comprises an air compressor 1, pressure regulating valves 2 and 3, an upstream flow rate adjuster 4 and a downstream flow rate adjuster 5, and an ejector 6, which is used for compressing and supplying a gas; The pressure of the gas is appropriately adjusted by the pressure adjusting valves 2 and 3, and the flow rate adjusters 4 and 5 are used. Appropriate flow is provided to provide annular flow conditions. The gas passing through the upstream flow rate controller 4 is provided directly to the injector 6, which assists in forming an annular flow. The gas flowing through the downstream flow rate controller 5 is sent to the nozzle 7a of the apparatus 7, thereby causing the sealant S to be foamed. The foamed sealant S' is directly introduced into the injection device 6.

The coating method can be understood in more detail with reference to Fig. 2, in which the simultaneous operation is performed by infiltrating the sealant into the joint portion P where the gas easily leaks, and infiltrating the sealant of the wall surface onto the line L. It should be noted that any excess sealant will be discharged in synchronism with the time of supply. The pressure gauge is usually designated by the reference numeral 9.

The foam sealant and the gas flowing through the pipe M are collected by the reduction vessel 12 and passed through the hose 10 connected to the faucet to the end of the pipeline to be coated. In the container 12, the liquid and the gas are separated from each other, and only the gas is discharged to the outside, and the sealant is collected.

After the blowing agent S' is supplied for a predetermined period of time, the valve 13 is closed to transfer the gas only in the pipeline, and the sealant adhering to the inner surface of the pipe M is quickly dried and solidified by other particles passing through the center of the pipe, at this time, foaming is used. The stage of the sealant.

Using the upgrading apparatus of Figs. 3 and 4, the foamed sealant S' is spirally distributed on the outer periphery of the mesh or the outer surface of the porous member 6c in the axial direction, and passes through the gas passing through the mesh or the inside of the axial porous member 6c. The sealant S' is drawn in and passed through the slit 6d to provide an annular flow condition.

In a tube having a diameter of 2.5 cm and a length of 7.5 m, the loading and discharging of the sealant takes two hours according to a conventional method, and the method of the present invention requires only 0.7 hours. In addition, according to the conventional method, the liquid sealant consumption is 9.5 liters, and the method requires only 4.1 liters.

According to an embodiment of the present invention, the amount of gas passing through the flow rate controllers 4 and 5 is 190 liters/min and 20 liters/min, respectively, and the pressure measured by the barometer 9 is 0.2 kg/cm ² .

Although a foam sealant is used in the foregoing embodiments, a liquid sealant can also be used.

The following description will discuss the second embodiment with reference to Figures 5 to 7.

The coating method according to the second embodiment is characterized in that a liquid sealant with compressed air is used as a carrier gas to form a gas-liquid mixed stream, and the gas-liquid mixed stream flows in an existing line at a very high speed. Thereby providing a circulation therein, the circulation will coat the inner surface of the pipeline, especially some of the grooves and defective portions will be coated with the sealant.

As the velocity of the gas-liquid mixed flow increases, the flow state is changed as shown in Figs. 5A to 5C. First, as shown in Fig. 5A, the liquid sealant a and the gas b respectively flow in the lower portion and the upper portion of the pipe M, thereby forming a laminar flow. Then, as shown in Fig. 5B, the liquid sealant a flows along the inner surface of the pipe M, and the gas b flows at a high speed along the center of the pipe M, thereby forming an annular flow. Finally, as shown in Fig. 8C, the main portion of the sealant a flows under the ejection conditions, thereby forming a jet stream. As shown, the annular flow is used for coating purposes.

How the annular flow works in the tube will be described and discussed below with reference to Figure 6.

The air supply fan 23 and the air discharge fan 24 are connected to an existing pipe M having an annular turning portion, and both ends of the pipe M are closed by a valve 22. A liquid sealant a is supplied from the can body 25 to the mixer 26. The liquid sealant a forms a gas-liquid mixture, which flows together with the carrier gas b supplied from the air supply fan 23 and the air discharge fan 24. The gas-liquid mixture flows at a sufficiently high velocity within the existing conduit M to provide the annular flow shown in Figure 5B. Therefore, the sealant a can be gathered in the groove portion, the hole, the crack, or the rough portion of the pipe M, which would otherwise cause leakage. The sealing process and the smoothing process can be performed on the pipe M thereafter. The excess sealant is collected by a gas-liquid separator placed at the end of the discharge line or by a mixer 26, respectively.

When it is ready to supply the liquid sealant in a somewhat misty form, it is advantageous that the gas-liquid mixture can flow at a low speed in an annular flow state.

As shown in Fig. 7, the method can provide a particularly effective function of sealing the pipeline with the sealant a and fixing the small portion d.

Figure 8 illustrates another embodiment in which the method is used for a large diameter gas main pipe M buried in the ground for sealing repair purposes.

In this embodiment, since the gas main pipe M has a large diameter, a pipe 39 having an outer diameter slightly smaller than the inner diameter of the main pipe M can be coaxially or approximately coaxially inserted in the main pipe M. Using a foaming apparatus similar to the apparatus 7 of Fig. 1, the foam sealant S' is supplied to the cylindrical space between the main pipe M and the pipe 39. 40. Thereafter, gas is introduced into the space 40 to discharge excess sealant. The pipe 39 is then removed for cleaning, while allowing the drying and curing of the cylindrical sealant remaining in the gas main pipe M.

In this example, the injection device 6 of Figure 1 is not required to be used. The use of an elastic tube at the location of the conduit 39 helps to perform this leak repair work.

In the process of sealing the large-diameter straight pipe in the pipeline as shown in FIG. 8, the required amount of the foaming agent or the foaming sealant S is greatly reduced, and the drying and solidification of the sealant can be faster, thereby making The repair work is more efficient and economical.

According to the methods disclosed in the prior art, it is generally desirable to perform a leak test on the pipeline to measure its leak before the inner surface of the pipe is subjected to a sealing process.

If the test indicates that the leak is higher than the predetermined value, the lining treatment is carried out together with the coating method of the present invention to provide a cylindrical film on the sealant coating to further prevent leakage. This hybrid treatment method can also prevent recurrence or preventive maintenance of any leaks.

In the lining process, a sealant having an adhesive property (referred to herein as an adhesive) is used, and the adhesive can be used conveniently, quickly, and uniformly according to any of the methods discussed previously.

The film lining treatment method is characterized in that the adhesive layer is formed in a cylindrical shape on the inner surface of the axial duct, and then the cylindrical film is inserted, and the film is adhered to the inner surface of the cylindrical adhesive layer.

As shown in Fig. 9, a cylindrical adhesive layer S" is formed on the inner surface of the pipe M, and according to the inversion method, a thin and sufficiently elastic cylindrical film 56 such as a polyethylene film cylinder is inserted. The interior of the layer S". That is, the tip end of the film 56 wound around the drum 57 is turned outward and tightly fixed to the film including the frame outlet 57A of the drum. The air is then sent to the turning portion of the duct film and is extended in the axial direction of the duct by means of a bellows 58 which communicates with the frame. By thus conveying the gas, the film 56 is inserted into the duct M from the outlet 57A, and the inner surface of the film 56 wound around the drum 57 is continuously turned over to be exposed to the outside. Due to the air pressure applied to the reverse portion of the film, the inverted film 56 is also stretched in the axially outward direction and uniformly bonded to the adhesive layer S" in both the radial direction and the axial direction. When the film 56 is used Arriving at the other end of the pipe M, the fan 58 stops And the film 56 is cut, as shown in the portion of FIG. The leak repair work is completed and the undesired film portion is re-wound onto the drum.

In order to insert the cylindrical film 56, in addition to the method of the present invention, an ingot method can also be used.

According to the ingot method, after the adhesive layer S" is formed, the end of the guide wire member is used to tie the film 56 before being inserted into the pipe M, and then the film 56 is inserted into the pipe M by pulling the guide wire member.

In addition to the gas lines, the method of the invention is also applicable to water pipes or cable lines. This method is not only suitable for repairing leaks, but also for preventive repair of new pipes, in which case there are no leaks or existing pipelines may be subject to some corrosion.

The present invention has been described with reference to the specific illustrative embodiments, and is not limited by the scope of the appended claims. It will be appreciated by those skilled in the art that the embodiments of the invention can be modified and modified without departing from the scope and spirit of the invention.

Claims

A method for coating a foaming agent or a foaming sealant in a pipe, characterized in that the coating machine used in the coating method comprises an air compressor (1), a pressure regulating valve (2, 3), and an upstream flow rate adjustment And a downstream flow rate adjuster (5) and an ejector (6) for compressing and supplying gas through a pressure regulating valve (2, 3), and a barometer (9) Adjusting the pressure of the gas and using a flow rate regulator (4, 5) to provide an appropriate flow to provide an annular flow condition for the injector (6) to directly supply gas through the upstream flow controller (4) The gas of the downstream flow rate controller (5) is sent to the nozzle (7a) of the device (7), thereby causing the sealant (S) to foam, and the foam sealant (S') is directly introduced into the injection device (6) The coating method comprises the following steps:

The S1 foam sealant (S') and the gas flowing through the pipe (M) are collected by the reduction vessel (12) and passed through the hose (10) connected to the faucet to reach the end of the pipeline to be coated, in the vessel ( 12), the liquid and the gas are separated from each other, only the gas is discharged to the outside, and the sealant is collected;

S2 provides the foam sealant (S') after a predetermined period of time, the valve (13) is closed to transfer the gas only in the pipeline, and the seal is adhered to the inner surface of the pipe (M) by the other particles passing through the center of the pipeline. Agent

The S4 upgrade device causes the foam sealant (S') to be spirally distributed on the outer periphery of the mesh or on the outer surface of the porous member (6c) in the axial direction, and passes through the interior of the mesh or the axial porous member (6c). The gas, the foam sealant (S') is drawn in and passed through the slit (6d) to provide an annular flow condition.
The method for coating a foaming agent or a foaming sealant according to claim 1, wherein the annular flow is in a circulating state, wherein a main part of the foaming agent or the foaming sealant is present. A state of a cylindrical layer flowing along the inner surface of the pipe, and the gas flows in the center of the pipe, and the flow of the gas further includes a foaming agent floating in the gas layer or a fine particle of the foaming sealant.
An in-line foaming agent or a foaming sealant coating method according to claim 1, It is characterized in that the operation performed simultaneously with the coating method is to infiltrate the sealant into the joint portion (P) where the gas is easily leaked, and penetrate the sealant of the wall surface onto the wire (L), and any excess sealant Will be discharged in parallel with the time of supply.
The method for coating a foaming agent or a foaming sealant according to claim 1, wherein the loading and discharging of the sealant takes only 0.7 hours for a pipe having a diameter of 2.5 cm and a length of 7.5 m. The liquid sealant consumption requires only 4.1 liters, and the amount of gas passing through the upstream flow rate controller (4) and the downstream flow rate controller (5) is 190 liters/min and 20 liters/min, respectively, and the barometer (9) The measured pressure was 0.2 kg/cm 2 .
A method of coating a foaming agent or a foaming sealant coating according to any one of claims 1 to 4, wherein the coating method is suitable for a foam sealant or a liquid sealant.
The method for coating a foaming agent or a foaming sealant according to claim 1, wherein when the coating method uses a liquid sealant with compressed air, the liquid sealant It will be used as a carrier gas to form a gas-liquid mixed stream. At a very high speed, the gas-liquid mixed stream flows in the existing pipeline to provide a circulation therein, and the circulation will coat the inner surface of the pipeline, especially some grooves and In the defect part, as the velocity of the gas-liquid mixed flow increases, first, the liquid sealant (a) and the gas (b) flow in the lower portion and the upper portion of the pipe (M), respectively, thereby forming a laminar flow, and then the liquid The sealant (a) flows along the inner surface of the pipe (M), and the gas (b) flows at a high speed along the center of the pipe (M) to form an annular flow, and finally, the main portion of the sealant (a) is in the spray condition Flows down to form a jet.
The method for coating a foaming agent or a foaming sealant according to claim 6, wherein the coating machine further comprises an air supply fan (23) and an air discharge fan (24), and a pipe (M) of the toroidal turning portion is connected, both ends of the pipe (M) are closed by a valve (22), and a tank body (25) and a mixer (26) are provided, the tank body (25) being The mixer (26) provides a liquid sealant (a) which forms a gas-liquid mixture, together with the carrier gas (b) supplied from the air supply fan (23) and the air discharge fan (24) flow.
An in-line foaming agent or a foaming sealant coating method according to claim 6, Characterized in that the gas-liquid mixed flow flows at a sufficiently high speed in the pipe (M) to provide an annular flow, the sealant (a) in the groove portion, the hole, the crack or the pipe (M) Aggregate within the rough part.
The method for coating a foaming agent or a foaming sealant according to claim 8, wherein after the coating, the pipe (M) is subjected to a sealing treatment and a smoothing treatment, and the excess sealant is respectively The gas-liquid separator placed at the end of the discharge line is collected.
A method of coating a foaming agent or a foaming sealant according to claim 8, characterized in that after coating, it is recycled by the mixer (26).