Portable PVC screen pipe

Abstract

The utility model discloses a portable PVC screen pipe, and relates to the technical field of gas extraction. The connecting device is installed on one side of the outer pipe, the inner pipe is installed in the outer pipe, and the upper baffle and the lower baffle are located between the outer pipe and the inner pipe. According to the utility model, the outer pipe and the inner pipe can be effectively supported by arranging a plurality of groups of fixed brackets, the sieve pipe is made of a polyethylene pipe (PVC pipe) which is suitable for underground coal mine and has antistatic and flame-retardant properties, and the extraction surface area of the surface of the sieve pipe is increased from a hole type to a notch groove type, so that the collection efficiency can be effectively improved; by designing the bottom with radian of the lower baffle, falling coal dust can be collected to the bottom of the lower baffle, and the two sides, connected with the two sets of fixing supports, of the lower baffle are slightly bent inwards, so that the coal dust cannot enter the space between the lower baffle and the inner pipe to cause blockage when falling from the upper portion, and the gas extraction efficiency cannot be affected; and blockage during hole collapse can be effectively reduced.

Description

Technical Field

[0001] This utility model belongs to the field of gas extraction technology, and in particular relates to a lightweight PVC screen pipe. Background Technology

[0002] Due to varying gas geological conditions in different mining areas of coal mines, or due to the combined effects of factors such as changes in burial depth within the same mining area, poor borehole formation and borehole collapse may occur after drilling in the same coal seam. This causes many inconveniences for subsequent borehole maintenance. To address this, a common measure is to lower a screen pipe through the inner through-hole of the large-diameter auger drill rod. The screen pipe pushes open the central crossbeam of the hinged drill bit to reach the bottom of the hole. The spring clip of the suspension device opens and anchors to the borehole wall. Finally, the drill rod is withdrawn, leaving the screen pipe inside the hole. The screen pipe remaining in the hole ensures the unobstructed gas drainage channel, extends the service life of the borehole, and improves the gas drainage effect.

[0003] After a period of time inside the existing perforated circular screen pipe, the borehole collapses due to ground stress, coal dust buries the screen pipe, and the screen pipe becomes blocked, affecting the pumping effect. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a lightweight PVC screen pipe, which can effectively solve the problems of the existing technology.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model is a lightweight PVC screen pipe, including: an outer pipe, a connecting device installed on one side of the outer pipe, an inner pipe installed inside the outer pipe, and an upper baffle and a lower baffle located between the outer pipe and the inner pipe.

[0007] It also includes: a slot is provided inside one side of the outer tube, a protrusion is provided on one side of the connecting device to cooperate with it and installed inside the slot, and a threaded post is fixed on the side of the outer tube away from the slot, and the threaded post is provided with threads that can cooperate with the inside of the connecting device.

[0008] The outer tube is equipped with three sets of fixed supports. The fixed supports located in the axial direction of the outer tube form one set. One side of the fixed support is connected to the inside of the outer tube, and the other side of the fixed support is connected to the inner tube installed inside the outer tube.

[0009] The upper baffle is connected to one set of fixed brackets, and the inner tube is connected to the other two sets.

[0010] Furthermore, the middle part of the protrusion fixed on the connecting device is also provided with a groove, and a limit block is also provided on the side of the slot on one side of the outer tube near the connecting device. The side of the outer tube with the slot is engaged with the connecting device through the groove and the limit block.

[0011] Furthermore, the outer tube with the threaded post on one side is threaded through a matching thread on the inner wall of the connecting device.

[0012] Furthermore, the upper baffle is fixed on one of the fixed supports between the outer tube and the inner tube, and the lower baffle is also fixed on the fixed support, thereby connecting the other two sets of fixed supports.

[0013] Furthermore, the outer tube has multiple sets of outer sieve holes, and the inner tube located inside the outer tube has multiple sets of inner sieve holes.

[0014] This utility model has the following beneficial effects:

[0015] This invention features a threaded post fixed on one side of the outer tube, enabling quick connection to a connecting device. The number of screen tubes can be increased or decreased according to the mining depth under different mining conditions to save costs. The screen tubes are made of polyethylene (PVC) pipe, suitable for underground coal mines, and are lightweight. Multiple sets of fixed supports effectively support the outer and inner tubes. The outer and inner screen holes on the outer and inner tubes collect methane gas. Furthermore, the method of increasing the extraction surface area of ​​the screen tube by changing from a "hole" type to a "groove" type effectively improves collection efficiency. By installing an upper baffle, when the screen tube is in a horizontal position, coal dust is prevented from entering the inner screen holes from the outside and causing blockage during hole collapse, thus playing a blocking role. Furthermore, the lower baffle, with its curved bottom, collects falling coal dust at its bottom. The sides of the lower baffle connecting to the two sets of fixed supports are slightly curved inwards, preventing coal dust falling from above from entering between the lower baffle and the inner tube and causing blockage, thereby not affecting gas extraction efficiency. This effectively reduces blockage during hole collapse, further improving efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the card slot connection of this utility model;

[0020] Figure 4 This is a schematic diagram of the protruding post connection of this utility model.

[0021] The attached diagram lists the components represented by each number as follows:

[0022] 1. Outer tube; 2. Connecting device; 3. Inner tube; 4. Upper baffle; 5. Lower baffle; 6. Outer sieve hole; 7. Inner sieve hole; 8. Fixed bracket. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0024] Please see Figure 1-4 As shown, this utility model is a lightweight PVC screen pipe, including: an outer pipe 1, a connecting device 2 installed on one side of the outer pipe 1, an inner pipe 3 installed inside the outer pipe 1, and an upper baffle 4 and a lower baffle 5 located between the outer pipe 1 and the inner pipe 3; it also includes: a slot is opened inside one side of the outer pipe 1, and a protrusion that cooperates with the slot is fixed on one side of the connecting device 2, and the connecting device 2 is installed inside the slot through the protrusion; a groove is also opened in the middle part of the protrusion fixed on one side of the connecting device 2, and a limiting block is also opened on the side of the slot on one side of the outer pipe 1 near the connecting device 2, and the side of the outer pipe 1 with the slot and the connecting device 2 are engaged through the groove and the limiting block, allowing the connecting device 2 to rotate inside the outer pipe 1, and the connecting device 2 will not leave the current position during the rotation. On the other side of the outer tube 1, a threaded post is fixedly provided, which is in sync with the threaded post inside the connecting device 2. The threaded post can be threaded into the connecting device 2. The number of screen tubes can be adjusted according to the mining depth. By connecting the side of one set of outer tubes 1 with the threaded post to the connecting device 2 on another set of screen tubes with the same structure, the two sets of screen tubes can be connected simply by aligning and turning the connecting device 2. The operation is simple and the number of screen tubes can be increased or decreased according to different situations.

[0025] Both the outer tube 1 and the inner tube 3 are hollow structures. The outer tube 1 has multiple sets of external screen holes 6, and the inner tube 3 also has internal screen holes 7 corresponding to the external screen holes 6, used for extracting methane gas. The inner tube 3 is located inside the outer tube 1 and is connected and fixed to the outer tube 1 by fixed supports 8 fixed on the inner wall of the outer tube 1. There are three sets of fixed supports 8. The fixed supports 8 located in the axial direction of the outer tube 1 form one set. Each set of fixed supports 8 has multiple supports according to the length of the outer tube 1. The upper baffle 4 is fixed on one set of fixed supports 8 and is "C" shaped. The lower baffle 5 is fixed on two sets of fixed supports 8 and is "W" shaped. The outer side of the lower baffle 5 connected to the two sets of fixed supports 8 is slightly bent inward. There is space between the two sides of the lower baffle 5 and the two sides of the upper baffle 4 so that the methane gas in the coal mine can enter the inner tube 3. When the screen tube is horizontal, a set of fixed supports 8 with the upper baffle 4 fixed on them are perpendicular to the horizontal plane. By designing the "W"-shaped bottom of the lower baffle 5, coal dust falling from the upper outer screen hole 6 can be collected at the bottom of the lower baffle 5, so that when coal dust falls from the top, it will not enter the inner screen hole 7 on the inner tube 3 and cause blockage, nor will it affect the gas extraction efficiency, and it is also easy to collect and clean. When the screen tube is vertical, the upper baffle 4 and lower baffle 5 fixed between the outer tube 1 and the inner tube 3 can also prevent coal dust from entering the inner tube 3. In use, the threaded post fixed on one side of the outer tube 1 can be quickly connected to the connecting device 2. Simply align the two sets of screen tubes and tighten the connecting device 2. The number of screen tubes can be increased or decreased according to the mining depth under different mining conditions to save costs. Multiple sets of fixed supports 8 can effectively support the outer tube 1 and the inner tube 3. The outer screen holes 6 and inner screen holes 7 opened on the outer tube 1 and the inner tube 3 can be used to collect gas. Furthermore, the method of increasing the extraction surface area of ​​the screen tube by changing from the "hole" type to the "groove" type can effectively improve the collection efficiency.

[0026] The above are merely preferred embodiments of the present utility model and do not limit the present utility model. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present utility model.

Claims

1. A lightweight PVC screen pipe, comprising: The outer tube (1), the connecting device (2) installed on one side of the outer tube (1), the inner tube (3) installed inside the outer tube (1), and the upper baffle (4) and lower baffle (5) located between the outer tube (1) and the inner tube (3); The feature is that it also includes: a slot is provided inside one side of the outer tube (1), a protrusion that cooperates with it is provided on one side of the connecting device (2) and installed inside the slot, and a threaded post is fixed on the side of the outer tube (1) away from the slot, and the threaded post is provided with a thread that can cooperate with the inside of the connecting device (2). The outer tube (1) is provided with three sets of fixed supports (8). The fixed supports (8) located in the axial direction of the outer tube (1) are one set. One side of the fixed support (8) is connected to the inner wall of the outer tube (1), and the other side of the fixed support (8) is connected to the outer wall of the inner tube (3) installed inside the outer tube (1).

2. The lightweight PVC screen pipe according to claim 1, characterized in that, The middle part of the protrusion fixed on the connecting device (2) is also provided with a groove, and the slot on one side of the outer tube (1) is also provided with a limiting block on the side of the connecting device (2). The side of the outer tube (1) with the slot is connected to the connecting device (2) through the groove and the limiting block.

3. The lightweight PVC screen pipe according to claim 1, characterized in that, The outer tube (1) is threaded on one side by a threaded post, and is threaded through a matching thread on the inner wall of the connecting device (2).

4. A lightweight PVC screen pipe according to claim 1, characterized in that, The upper baffle (4) is fixed on one of the fixed supports (8) between the outer tube (1) and the inner tube (3), and the lower baffle (5) is also fixed on the fixed support (8), and at the same time connects the other two fixed supports (8).

5. A lightweight PVC screen pipe according to claim 1, characterized in that, The outer tube (1) has multiple sets of outer sieve holes (6), and the inner tube (3) located inside the outer tube (1) has multiple sets of inner sieve holes (7).

Images