A slurry mixer for underground pipe network repair

Abstract

The utility model provides a kind of slurry agitator for underground pipe network repair, it is characterized by, including: tank body;With the feed line of tank body connection, feed line includes inner tube and the outer tube of the inner tube of setting, inner tube is close to tank body one end in along feeding direction sequentially installed with gas-solid separator, multiple groups of coaxial water, air port and sealing baffle, air port is connected external air source by control valve, water port is connected water source between inner tube and outer tube by control valve, sealing baffle is set to inner tube end, and for preventing slurry backflow to inner tube;And be set to the propeller of tank body inside.The utility model effectively solves the technical problem of slurry preparation and conveying link in underground pipe network repair process, improves construction efficiency and repair quality, with broad application prospect.

Description

Technical Field

[0001] The embodiments disclosed herein generally relate to the field of building construction, and more specifically, to a slurry mixer for underground pipeline repair. Background Technology

[0002] In the current era of rapid urbanization, underground pipe networks serve as the "lifeline" of urban infrastructure, and their healthy operation directly impacts residents' daily lives, the stability of industrial production, and the sustainable development of cities. However, due to their long-term underground burial and the influence of various factors such as geological changes, media corrosion, and the increase in service life, underground pipe networks inevitably experience problems such as damage and leakage. Therefore, timely and effective repair work is crucial.

[0003] In the field of underground pipeline repair, spraying cement slurry is a common technique. The principle is to uniformly spray cement slurry onto the inner wall of the pipeline to form a strong protective layer, thereby restoring the structural strength and sealing performance of the pipeline.

[0004] However, current technologies have significant limitations in the preparation and transportation of cement slurry. Specifically, during construction, large slurry mixers are typically set up on the ground to mix cement, water, and other additives in specific proportions, forming a homogeneous cement slurry. This slurry then needs to be transported to the underground work surface via long hoses for spraying. However, cement slurry possesses unique physicochemical properties; during settling or transportation, it gradually undergoes a hydration reaction over time, leading to decreased fluidity and even solidification. This solidification trend is even more pronounced during long-distance hose transportation: on the one hand, some of the already solidified slurry tends to adhere to the inner wall of the hose. As the transportation time increases, the adhered slurry accumulates, which can easily cause pipeline blockage. This not only interrupts the construction process but also requires a lot of manpower and resources to clear the blockage, seriously affecting construction efficiency. On the other hand, because the slurry partially solidifies during transportation, the uniformity of the slurry reaching the underground working surface is greatly reduced, resulting in uneven thickness and localized missed spraying during spraying. This makes it difficult to guarantee the quality of the repaired pipeline network, which may shorten the service life of the pipeline network and increase the later maintenance costs. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this utility model provides a slurry mixer for underground pipeline repair, which is small in size, low in cost, and easy to move. At the same time, it can overcome the special environment of narrow and humid underground spaces, greatly improving the efficiency of underground pipeline repair.

[0006] This utility model provides a slurry mixer for underground pipeline repair, including a tank; a feed pipe connected to the tank, the feed pipe including an inner pipe and an outer pipe sleeved on the inner pipe, a gas-solid separator installed sequentially along the feed direction at one end of the inner pipe near the tank, multiple sets of coaxially arranged water and air ports and sealing baffles, the air ports being connected to an external air source through a control valve, the water ports being connected to a water source between the inner and outer pipes through a control valve, the sealing baffles being located at the end of the inner pipe and used to prevent slurry from flowing back into the inner pipe; and a propeller located inside the tank.

[0007] Furthermore, the inner tube includes a reducing pipe section near the tank body. Inside the reducing pipe section, gas-solid separators, multiple sets of coaxially arranged water and air ports and sealing baffles are installed sequentially along the feeding direction. The axial cross section of the reducing pipe section is symmetrical along the centerline of its length direction, and the two ends are connected to the middle position by a continuous and smooth curved surface transition without obvious sharp corners or broken lines.

[0008] Furthermore, the axial cross-sectional profile of the variable diameter pipe section is such that the two ends bend outward to form relatively large diameter ends, while the middle area is concave inward to form a neck with a smaller diameter than the two ends. The variable diameter pipe section includes a first variable diameter pipe section with a gradually decreasing diameter and a second variable diameter pipe section with a gradually increasing diameter along the feeding direction. The second variable diameter pipe section is equipped with a gas-solid separator, multiple sets of coaxially arranged water and air ports, and sealing baffles in sequence along the feeding direction.

[0009] Furthermore, an air vent is provided at the top of the tank, which is connected to an external pump via a hose for introducing gas into the tank or creating a vacuum.

[0010] Furthermore, each set of water and air ports includes an air inlet, a water outlet, and a return air inlet arranged sequentially on the inner pipe along the feeding direction.

[0011] Furthermore, the sum of the airflow supplied into the inner pipe by each air inlet and outlet is approximately equal to the sum of the airflow discharged from the inner pipe through each return air outlet.

[0012] Furthermore, the airflow rate at the lower air port is greater than that at the upper air port.

[0013] Furthermore, the propeller is mounted on the stirring shaft inside the tank, which is driven by a drive motor to rotate, and the blades of the propeller are set at an angle.

[0014] This utility model's slurry mixer is designed with full consideration of the special environment of underground pipeline repair work, such as confined spaces and dampness. The mixer has a compact and lightweight overall structure, making it easy to install and move within underground pipelines. Furthermore, all electrical components are waterproof and moisture-proof to ensure normal operation even in humid environments.

[0015] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0016] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein...

[0017] Figure 1 A front sectional view of a mixer for underground pipeline repair provided in an embodiment of the present invention is shown.

[0018] Figure 2 It shows Figure 1 A partial front sectional view of a variable diameter pipe section.

[0019] in, Figure 1-2 The correspondence between the reference numerals and component names in the attached drawings is as follows: 1 Tank body, 2 Feed pipe, 20 Inner pipe, 200 First gas-solid separator, 201 Air inlet, 2011 First air inlet, 2012 Second air inlet, 2013 Third air inlet, 202 Water outlet, 2021 First water outlet, 2022 Second water outlet, 2023 Third water outlet, 203 Return air outlet, 2031 First return air outlet, 2032 Second return air outlet, 2033 Third return air outlet, 204 Sealing baffle, 205 Variable diameter pipe section, 2051 First variable diameter pipe section, 2052 Second variable diameter pipe section, 21 Outer pipe, 3 Propeller, 4 Air inlet, 400 Second gas-solid separator, 5 Stirring shaft. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0021] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0022] The following reference Figure 1This invention describes a slurry mixer for underground pipe network repair, comprising a tank 1, a feed pipe 2 connected to the tank 1, and a propeller 3 disposed inside the tank 1. The feed pipe 2 includes an inner pipe 20 and an outer pipe 21 sleeved around the inner pipe 20. A first gas-solid separator 200 is sequentially installed along the feed direction near the end of the inner pipe 20 close to the tank 1, along with multiple sets of coaxially arranged water and air ports and a sealing baffle 204. The air port is connected to an external air source via a control valve, and the water port is connected to a water source in the gap between the inner pipe 20 and the outer pipe 21 via a control valve. The sealing baffle 204 is disposed at the end of the inner pipe 20 to prevent slurry backflow into the inner pipe 20.

[0023] In this embodiment, the inner tube 20 includes a reducing pipe section 205 at one end near the tank body 1. The axial cross-section of the reducing pipe section 205 is symmetrical along its length direction centerline, and the two ends are connected to the middle position by a continuous and smooth curved surface transition without obvious sharp corners or broken lines. Inside the reducing pipe section 205, along the feeding direction, a first gas-solid separator 200, multiple sets of coaxially arranged water and air ports, and sealing baffles 204 are installed sequentially.

[0024] More specifically, the axial cross-sectional profile of the reducing pipe section 205 is such that the two ends bend outwards, forming relatively large-diameter ends, while the middle section concaves inwards, forming a neck with a smaller diameter than the two ends. For example... Figure 2 As shown, the variable diameter pipe section 205 includes a first variable diameter pipe section 2051 with a gradually decreasing diameter and a second variable diameter pipe section 2052 with a gradually increasing diameter along the feeding direction. A first gas-solid separator 200, multiple sets of coaxially arranged water and air ports, and a sealing baffle 204 are sequentially installed inside the second variable diameter pipe section 2052. Specifically, the first gas-solid separator 200 is installed at the head end of the second variable diameter pipe section 2052, the sealing baffle 204 is installed at the tail end of the second variable diameter pipe section 2052, and multiple sets of coaxially arranged water and air ports are provided in the middle part.

[0025] In this embodiment, the mixer is directly installed within the underground pipe network, or mounted on a dredging or cleaning machine and placed within the underground pipe network to perform cement mortar mixing. Since the area of ​​the underground pipe network to be repaired is still a considerable distance from the surface feeding point, the feed pipe 2, except for the reducing pipe section 205, is a long flexible hose that passes through a monitoring well from the surface feeding point into the underground pipe network; the reducing pipe section 205 is made of a rigid, corrosion-resistant material. Furthermore, an anti-sticking and anti-corrosion coating is applied to the inner walls of the inner pipe 20 and the outer pipe 21 to reduce the friction coefficient of the inner wall of the inner pipe 20 and prevent other substances from adhering to the inner wall of the inner pipe 20, thus preventing blockage.

[0026] In this embodiment, the cement mortar mixed by the mixer is typically made by mixing cement powder, fine sand, water, and additives. During feeding, solid materials such as cement powder and fine sand are fed into the tank 1 through the inlet of the inner pipe 20, while liquid materials such as water and additives are fed into the tank 1 through the gap between the inner pipe 20 and the outer pipe 21.

[0027] Specifically, a screw air compressor (not shown in the figure) is installed on the inner pipe 20 near the feed port to supply compressed gas with a pressure greater than atmospheric pressure at the ground surface into the inner pipe 20. Simultaneously, a first gas-solid separator 200 is installed at the reducing pipe section 205. When solid material passes through the first gas-solid separator 200 with the airflow, the solid material is separated and falls into the tank 1, while the clean gas is discharged through the exhaust port 4 of the first gas-solid separator 200. Thus, an airflow path in the same direction as the feed direction is formed inside the inner pipe 20. Combined with the gravity of the solid material itself, this allows the solid material added at the feed port to fall into the mixer tank 1.

[0028] More specifically, the mixture of cement powder and fine sand enters the pipeline through the inlet of the inner pipe 20. High-pressure compressed air from the screw air compressor enters the inner pipe 20, creating an airflow thrust that carries the cement powder and fine sand added from the inlet along the inner pipe 20 towards the tank 1, blowing the material. Finally, the solid material enters the first gas-solid separator 200 with the airflow: due to its large weight, the sand is thrown against the wall by centrifugal force within the first gas-solid separator 200 and falls into the tank 1; the lime powder is trapped by the bag filter dust collector and enters the tank 1 through the discharge valve; and the clean air is discharged from the inner pipe 20 by the first gas-solid separator 200.

[0029] In this embodiment, the inner tube 20 includes four pipelines: a pre-separation airflow pipeline from the screw air compressor to the first gas-solid separator 200; a pre-separation material pipeline from the feed inlet to the first gas-solid separator 200; a post-separation material pipeline from the first gas-solid separator 200 to the tank 1; and a post-separation airflow pipeline from the first gas-solid separator 200 to the external exhaust system. All four pipelines are located inside the inner tube 20. The pre-separation airflow pipeline and the pre-separation material pipeline are the same pipeline, both being part of the inner tube 20 except for the second reducing pipe section 2052; the post-separation material pipeline is the second reducing pipe section 2052; and the post-separation airflow pipeline is the exhaust pipeline when the first gas-solid separator 200 exhausts gas to the outside of the feed pipeline 2.

[0030] In this embodiment, multiple sets of water and air ports are coaxially arranged along the axial direction of the feed pipe 2. Each set of water and air ports includes an air inlet 201, a water outlet 202, and a return air outlet 203 arranged sequentially on the inner wall of the inner pipe 20 along the feed direction. That is, in each set of water and air ports, the air inlet 201 is located on the upper inner wall of the inner pipe 20 section where the water and air port is located, the water outlet 202 is located on the middle inner wall, and the return air outlet 203 is located on the lower inner wall.

[0031] In other embodiments, if there are two or more air inlets 201, water outlets 202 or return air inlets 203, they are distributed in a ring along the radial direction of the inner tube 20 on the inner wall of the inner tube 20.

[0032] In this embodiment, when both the water and air ports are closed, the annular gap between the inner pipe 20 and the outer pipe 21 and the passage inside the inner pipe 20 are not connected.

[0033] In this embodiment, a gas port 4 is provided at the top of the tank 1. The gas port 4 is connected to an external pump body through a hose for introducing gas into the tank 1 or drawing a vacuum. A second gas-solid separator 400 is provided at the gas port 4 to ensure that only gas can enter and exit the tank 1, while solid materials always remain inside the tank 1.

[0034] In this embodiment, all ports and switches are closed before the mixer starts operating. When the mixer starts operating, solid materials need to be added first. At this time, the screw air compressor, the first gas-solid separator 200, and the sealing baffle 204 are opened, and solid materials such as cement and fine sand are injected into the inner tube 20 through the feed inlet. The solid materials fall and are transported into the tank 1 under the action of gravity, the first gas-solid separator 200, and the screw air compressor. After the feeding is completed at the feed inlet, most of the solid materials fall into the tank 1, but a small amount of solid materials remain at the neck of the reducing pipe section 205 and on the inner wall of the upper inner tube. At this time, the pump is briefly started to perform a rapid vacuum operation, which instantly reduces the air pressure inside the tank 1, causing the small amount of solid materials remaining in the neck and the upper inner tube 20 to fall into the tank 1 under the action of the pressure difference, and the solid material feeding is completed.

[0035] After the solid material feeding is completed, the screw air compressor and the first gas-solid separator 200 are shut off, blocking the airflow and solid material passage in the inner pipe 20. Water and additives are then added into the gap between the inner pipe 20 and the outer pipe 21, creating a water flow path between them. At this time, the water outlet 202 is opened, allowing the liquid material to enter the inner pipe 20 through the annular gap between the inner and outer pipes, rinsing the inner wall of the second reducing pipe section 2052 below the first gas-solid separator 200. This rinses away the solid material adhering to the inner wall of the second reducing pipe section 2052, which then falls into the tank 1. After a fixed rinsing time, the liquid material feeding is completed, and the water port is closed. The feeding operation is now finished.

[0036] In this embodiment, when adding liquid materials, first add other liquid materials besides water, such as additives, so that a small amount of additives or other small doses of liquid adhering to the inner wall of the outer tube 21 and the outer wall of the inner tube 20 can be flushed into the inner tube 20 by a large amount of water and fall into the tank 1, preventing the final repair effect of the official website from being affected by the error in the slurry ratio.

[0037] In this embodiment, after the feeding is completed, the air port is opened, and the sum of the airflow rates supplied to the variable diameter pipe section 205 by each air inlet 201 and air outlet 4 is approximately equal to the sum of the airflow rates discharged from the variable diameter pipe section 205 through each return air outlet 203. Furthermore, the airflow rate at the lower air port is greater than the airflow rate at the upper air port. Hot airflow can be introduced into the variable diameter pipe section 205 through the air inlet 201.

[0038] In this embodiment, such as Figure 2 As shown ( Figure 2With the central sealing baffle 204 in the open position, the water and air ports are arranged in three sets from top to bottom, including the first air inlet 2011, the first water outlet 202, the first return air outlet 2031, the second air inlet 2012, the second water outlet 2022, the second return air outlet 2032, the third air inlet 2013, the third water outlet 2023, and the third return air outlet 2033. Among them, the return air flow rate of the first return air inlet 2031 is greater than the air inlet flow rate of the first air inlet 2011 and less than the air inlet flow rate of the second air inlet 2012; the return air flow rate of the second return air inlet 2032 is greater than the air inlet flow rate of the second air inlet 2012 and less than the air inlet flow rate of the third air inlet 2013; the return air flow rate of the third return air inlet 2033 is greater than the air inlet flow rate of the third air inlet 2013; at the same time, the pump body connected to the air inlet 4 is opened to introduce inert gas into the tank 1, so that the gas inlet and outlet flow rates in the tank 1 are approximately equal. This configuration ensures that the gas entering tank 1 through the first air inlet 2011 is first discharged through the first return air inlet 2031, the gas entering tank 1 through the second air inlet 2012 is first discharged through the second return air inlet 2032, and the gas entering tank 1 through the third air inlet 2013 is first discharged through the third return air inlet 2033. Ultimately, this creates a naturally downward-flowing hot airflow within tank 1, allowing moisture remaining on the inner wall of the reducing pipe section 205 after the rinsing operation to be quickly removed. Simultaneously, it prevents cement from the bottom of tank 1 from floating upwards and re-entering the reducing pipe section 205, thus keeping the reducing pipe section 205 dry and clean. After a fixed drying time, the air inlet and sealing baffle 204 are closed, thus completing the drying operation.

[0039] In this embodiment, the exhaust pipe of the first gas-solid separator 200 that exhausts to the outside and the pipe of the air port that transports airflow to the external air source must pass through the gap between the inner pipe 20 and the outer pipe 21 to be sealed and connected to the first gas-solid separator 200 and the inner pipe 20 respectively, and be absolutely physically isolated from the gap between the inner pipe 20 and the outer pipe 21.

[0040] In this embodiment, the propeller 3 is mounted on the stirring shaft 5 inside the tank 1. The stirring shaft 5 is driven to rotate by a drive motor. The blades of the propeller 3 are inclined to enhance the fluidity of the slurry during stirring and improve the uniformity of stirring. The inclination angle of the propeller 3 blades can be adjusted according to actual stirring requirements to ensure that the slurry is fully mixed and uniformly dispersed within the tank 1. The blade surface can also be made of a wear-resistant material to improve the service life of the propeller 3 and reduce contamination of the slurry during stirring. After a fixed stirring time, the stirring operation ends.

[0041] In this embodiment, a discharge port is also provided at the bottom of the tank 1 for discharging the mixed slurry. A valve can be installed at the discharge port to flexibly control the timing and flow rate of slurry discharge. Before discharging the slurry, the pump can be restarted to inject compressed air into the tank 1 to ensure that the slurry can be discharged smoothly and without residue.

[0042] According to the embodiments of this disclosure, the following technical effects are achieved: by setting up nested feed pipes 2, solid materials and liquid materials are completely separated during transportation, reducing the curing time of the slurry and improving the physicochemical properties of the slurry during coating; by setting up a rigid variable diameter pipe section 205 and cooperating with a vacuum pump, solid materials can smoothly enter the tank 1, preventing them from staying in the feed pipe 2 and blocking the feed pipe 2; by setting up a variable diameter pipe section 205 with a constriction neck, the smoothness of solid materials entering the tank 1 is further improved; by setting up the air inlet 201, water outlet 202 and return air inlet 203 in sequence, and gradually increasing the flow rate of the air inlet along the feeding direction, a natural downward airflow is formed in the variable diameter pipe section 205, which dries the variable diameter pipe section 205 while preventing cement powder in the tank 1 from floating upward and causing secondary contamination of the variable diameter pipe section 205.

[0043] In the description of this specification, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A slurry mixer for underground pipeline repair, characterized in that, include: Tank body; The feed pipe connected to the tank body includes an inner pipe and an outer pipe sleeved over the inner pipe. A gas-solid separator is installed sequentially along the feed direction at one end of the inner pipe near the tank body. Multiple sets of coaxially arranged water and air ports and sealing baffles are also included. The air ports are connected to an external air source through a control valve, and the water ports are connected to a water source between the inner and outer pipes through a control valve. The sealing baffles are located at the end of the inner pipe and are used to prevent slurry from flowing back into the inner pipe. A propeller is also installed inside the tank body.

2. The mixer according to claim 1, characterized in that, The inner tube includes a variable diameter pipe section at one end near the tank body. A gas-solid separator, multiple sets of coaxially arranged water and air ports and sealing baffles are installed sequentially in the variable diameter pipe section along the feeding direction. The axial cross section of the variable diameter pipe section is symmetrical along the centerline of its length direction, and the two ends and the middle position are connected by a continuous and smooth curved surface transition without obvious sharp corners or broken lines.

3. The mixer according to claim 2, characterized in that, The axial cross-sectional profile of the variable diameter pipe section is that the two ends bend outward to form relatively large diameter ends, and the middle area is concave inward to form a neck with a smaller diameter than the two ends. The variable diameter pipe section includes a first variable diameter pipe section with a gradually decreasing diameter and a second variable diameter pipe section with a gradually increasing diameter along the feeding direction. The second variable diameter pipe section is equipped with a gas-solid separator, multiple sets of coaxially arranged water and air ports and sealing baffles in sequence along the feeding direction.

4. The mixer according to claim 1, characterized in that, The top of the tank has an air inlet, which is connected to an external pump via a hose for introducing gas into the tank or creating a vacuum.

5. The mixer according to claim 4, characterized in that, Each set of water and air ports includes an air inlet, a water outlet, and a return air inlet arranged sequentially on the inner pipe along the feeding direction.

6. The mixer according to claim 5, characterized in that, The sum of the airflow rates supplied to the inner tube by each of the air inlets and air outlets is approximately equal to the sum of the airflow rates discharged from the inner tube through each of the return air outlets.

7. The mixer according to claim 1, characterized in that, The airflow rate of the lower air port is greater than that of the upper air port.

8. The mixer according to claim 1, characterized in that, The propeller is mounted on a stirring shaft inside the tank, and the stirring shaft is driven to rotate by a drive motor. The blades of the propeller are set at an angle.

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