A drainage assembly of an oilfield sewage filtering tank bottom convenient to replace screen pipe

Abstract

The utility model relates to the technical field of sewage filtering tank, specifically is a kind of oilfield sewage filtering tank bottom convenient replacement screen pipe's drainage assembly. The drainage assembly includes one collecting pipe 1, two branch collecting pipes 2, several supporting legs 3, connector 4, sleeve 5, screen pipe 6, plug 7, sealing ring 8, small branch plate 9. The drainage assembly will the sleeve and screen pipe one end be set in tank outside, when the screen pipe is seriously blocked or damaged, in tank outside can the screen pipe be taken out and cleaned or replaced, save time and labour, avoid personnel into tank risk;And, the outside of screen pipe has the sleeve protection of thick wall, the goose pebble of cushion layer cannot extrude screen pipe, screen pipe is not easy to damage.

Description

Technical Field

[0001] This utility model relates to the field of wastewater filter tank technology, specifically a drainage component for easy replacement of the screen tube at the bottom of an oilfield wastewater filter tank. Background Technology

[0002] In oilfields, filter tanks are primarily used for the filtration of oily wastewater. The filter tanks are filled with filter media and a bedding layer. The upper layer consists of very fine-grained filter media such as quartz sand, magnetite, or walnut shells; the middle and lower layers consist of gravel with gradually increasing particle sizes; and the largest pebbles are located near the bottom collection pipe. Wastewater is injected from the top of the filter tank, filtered through the filter media layers, and then collected at the bottom collection pipe before being discharged from the filter tank.

[0003] The water collection pipe is located at the bottom of the wastewater filter tank. Its collection manifold is typically a multi-row perforated screen tube with sealed ends, used to collect the filtered, qualified water, which is then connected to the external drainage pipe via a main pipe or outlet pipe. Although the filter tank contains multiple layers of filter media, trace amounts of filter media can easily diffuse to the vicinity of the collection manifold under the mixing and agitation effects of periodic backwashing. Additionally, long-term use and deterioration of the filter media can lead to oil seepage into the vicinity of the collection manifold, all of which can easily clog its pores. When the pores of the collection manifold are severely clogged or damaged, it needs to be removed for cleaning or replacement.

[0004] When cleaning or replacing the water collection manifold at the bottom of the filter tank, it is necessary to first remove all the filter media and padding inside the tank. Then, personnel must enter the tank to disassemble and remove the blocked or damaged water collection manifold at the bottom, clean or replace it, and finally fill the filter tank with padding and filter media step by step through the manhole. This process is not only time-consuming and costly, but also poses a significant safety risk to personnel entering the oil-containing filter tank. Summary of the Invention

[0005] In response to the technical problems mentioned in the background above, this utility model provides a drainage component at the bottom of an oilfield wastewater filter tank that facilitates the replacement of the screen tube. The water collection component can be cleaned or replaced from outside the tank without removing or filling filter media and padding. Moreover, no personnel need to enter the filter tank, making it safe and convenient.

[0006] Technical Solution: A drainage assembly for easy replacement of screen pipes at the bottom of an oilfield wastewater filter tank includes a main pipe horizontally welded to the filter tank body. One end of the main pipe is inserted into the tank and a perforated plug is welded to the end. The other end is connected to a drainage pipe outside the tank. A branch pipe is connected to each of the left and right sides of the inner section of the main pipe. Each branch pipe is an arc-shaped pipe arranged horizontally near the inner wall of the tank, with a perforated plug welded to its end. Several connectors are horizontally connected to the inner arc of each branch pipe. Three connectors are also horizontally connected to the end face of the main pipe and the two end faces of the branch pipes. Each connector consists of a short connector and a variable connector. The connector consists of a reducing connector end connected to a sleeve, which is a thick-walled pipe with a flange at one end. The sleeve is welded to the filter tank, with its flange end located outside the tank. Several coarse holes are machined on the pipe section inside the tank, with the size of the coarse holes being smaller than the size of the pebbles outside the pipe. The flange end of the sleeve is sealed with a plug connected to it by several sets of bolts and nuts. A screen tube is installed inside the sleeve, with the outer diameter of the screen tube being smaller than the inner diameter of the sleeve, forming a ring space. Several fine holes are machined on the screen tube, with the size of the fine holes being smaller than the size of the filter media particles, to prevent the filter media from mixing into the water to be discharged.

[0007] Furthermore, in order to accurately connect and position the screen tube, a positioning hole is machined on the inner wall of the connector, and the inner diameter of the positioning hole is clearance-fitted with the outer diameter of the screen tube; a short support cylinder is provided on the inner wall side of the plug, and the outer diameter of the short support cylinder is clearance-fitted with the inner diameter of the screen tube; one end of the screen tube is inserted into the positioning hole, and the other end is fitted onto the short support cylinder to prevent movement.

[0008] Furthermore, in order to ensure that the annular gap between the screen tube and the sleeve is uniform, four small support plates are welded to the screen tube at certain intervals, and the four small support plates are evenly distributed in the circumferential direction.

[0009] Furthermore, in order to enhance the support strength of the manifold, several support legs are provided at a certain distance at the bottom of the two manifolds, and the lower ends of the support legs are welded to the lower end cap of the filter tank.

[0010] Furthermore, in order to ensure the seal between the sleeve flange end and the plug, a sealing ring is provided between the two.

[0011] Compared with existing background technologies, the above-described at least one technical solution adopted in one or more embodiments of this specification can achieve the following beneficial effects: First, the drainage assembly places one end of the sleeve and screen outside the tank. When the screen is severely blocked or damaged, it can be removed for cleaning or replacement from outside the tank, saving time and effort and avoiding the risk of personnel entering the tank. Second, the screen is protected by the thick-walled sleeve, and the pebbles in the pad cannot squeeze the screen, making the screen less prone to damage.

[0012] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the present invention.

[0013] Other features and aspects of the present invention will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0014] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the specification, serve to explain the technical solutions of the present invention.

[0015] Figure 1 A front view of the drainage assembly installed at the bottom of the filter tank; Figure 2 A sectional top view of the drainage assembly installed at the bottom of the filter tank; Figure 3 A cross-sectional left view of the drainage assembly installed at the bottom of the filter tank; Figure 4 This is a partial cross-sectional view of the drainage assembly; Figure 5 This is a cross-sectional view showing the connection between the screen pipe and the small support plate of the drainage assembly. Figure 6 This is a cross-sectional view of the connector of the drainage assembly; Figure 7 This is a cross-sectional view of the plug of the drainage assembly.

[0016] In the diagram: 1-Combination pipe; 2-Branch pipe; 3-Support leg; 4-Connector: 401-Short connector, 402-Reducing connector, 403-Positioning hole; 5-Sleeve; 6-Screw pipe; 7-Plug: 701-Short support cylinder; 8-Sealing ring; 9-Small support plate; 10-Filter tank; 11-Filter media and pad. Detailed Implementation

[0017] The various exemplary embodiments, features, and methods of use of this utility model will be described in detail below with reference to the accompanying drawings. The same reference numerals in the drawings denote elements with the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0018] Furthermore, to better illustrate this utility model, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this utility model can be implemented without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail in order to highlight the main points of this utility model.

[0019] like Figures 1-7 As shown, a drainage assembly for easy replacement of the screen pipe at the bottom of an oilfield wastewater filter tank includes a main pipe 1, two branch pipes 2, several support legs 3, a connector 4, a sleeve 5, a screen pipe 6, a plug 7, a sealing ring 8, and a small support plate 9.

[0020] like Figures 1-3 As shown, the main pipe 1 is horizontally welded to the filter tank 10, with one end inserted into the tank and a perforated plug plate welded to the end, and the other end connected to the external drainage pipe; a branch pipe 2 is connected to each of the left and right sides of the inner section of the main pipe 1, and the branch pipe 2 is an arc-shaped pipe arranged horizontally near the inner wall of the tank, with a perforated plug plate welded to the end of the pipe; in order to enhance the support strength of the branch pipe 2, several support legs 3 are set at a certain distance at the lower part of the two branch pipes 2, and the lower end of the support legs 3 is welded to the lower end cap of the filter tank 10.

[0021] like Figures 2-4 As shown, several connectors 4 are horizontally connected to the inner arc of the manifold 2. Three connectors 4 are also horizontally connected to the end face of the main pipe 1 and the two end faces of the manifold 2. Each connector 4 consists of a short connector 401 and a reducing connector 402. The reducing connector 402 of the connector 4 is connected to a sleeve 5. The sleeve 5 is a thick-walled pipe with a flange at one end. The sleeve 5 is welded to the filter tank 10, and its flange end is located outside the tank. Several coarse holes are machined on the pipe section inside the tank. The size of the coarse holes is smaller than the size of the pebbles outside the pipe. The flange end of the sleeve 5 is sealed with a plug 7 by several sets of bolts and nuts. In order to ensure the seal between the flange end of the sleeve 5 and the plug 7, a sealing ring 8 is set between the two.

[0022] like Figures 4-5 As shown, a screen tube 6 is installed inside the sleeve 5. The outer diameter of the screen tube 6 is smaller than the inner diameter of the sleeve 5, forming a ring-shaped space. The screen tube 6 is machined with several fine holes, the size of which is smaller than the size of the filter media particles, to prevent the filter media from mixing into the water to be discharged. To ensure that the ring gap between the screen tube 6 and the sleeve 5 is uniform, four small support plates 9 are welded to the screen tube 6 at certain intervals. The four small support plates 9 are evenly distributed in the circumferential direction.

[0023] like Figure 4 and Figure 6 , Figure 7 As shown, in order to accurately connect and position the screen tube 6, a positioning hole 403 is machined on the inner wall of the connector 4, and the inner diameter of the positioning hole 403 is clearance-fitted with the outer diameter of the screen tube 6; a short support cylinder 701 is provided on the inner wall side of the plug 7, and the outer diameter of the short support cylinder 701 is clearance-fitted with the inner diameter of the screen tube 6; one end of the screen tube 6 is inserted into the positioning hole 403, and the other end is fitted onto the short support cylinder 701 to prevent movement.

[0024] like Figures 1-4 As shown, the specific implementation method of this utility model is as follows: One end of the sleeve 5 is supported on the manifold 2, and the other end is supported on the filter tank 10. The coarse holes on the sleeve prevent the pebbles in the bottom pad from entering, thereby protecting the screen tube 6 inside from compression and extending its service life.

[0025] When the wastewater in the upper part of the filter tank is filtered by the filter media, it seeps through the pad layer into the lower part and enters the screen tube 6. The small particles of filter media entrained therein are blocked outside the screen tube 6. The filtered water is collected into the main pipe 1 through the two branch pipes 2 and discharged into the pipeline outside the tank.

[0026] When the screen tube 6 is severely clogged, first drain the water from the filter tank; then, remove the plug 7 from the outside of the tank, and take out the screen tube 6 for cleaning or replacement; at the same time, connect the outer flange end of the sleeve 5 to the drain hose, and inject a small amount of water into the water inlet pipe at the top of the filter tank to flush out the small amount of filter media particles remaining in the sleeve 5; finally, put the cleaned screen tube 6 into the sleeve 5, and seal the plug 7 to complete the repair.

Claims

1. A drainage assembly for easy replacement of screen pipes at the bottom of an oilfield wastewater filter tank, comprising a collection pipe (1), characterized in that: The main pipe (1) is horizontally welded to the filter tank (10), with one end inserted into the tank and a perforated plug welded to the end, and the other end connected to the external drainage pipe; a branch pipe (2) is connected to each of the left and right sides of the inner section of the main pipe (1), and the branch pipe (2) is an arc-shaped pipe arranged horizontally near the inner wall of the tank, with a perforated plug welded to the end of the pipe; several connectors (4) are horizontally connected to the inner arc of the branch pipe (2), and three connectors (4) are also horizontally connected to the end face of the main pipe (1) and the two end faces of the branch pipe (2), and each connector (4) consists of a short connector (401) and a reducing connector (402); the connector (4) of the branch pipe (4) A reducing connector (402) is connected to a sleeve (5). The sleeve (5) is a thick-walled pipe with a flange at one end. The sleeve (5) is welded to the filter tank (10). Its flange end is located outside the tank. Several coarse holes are machined on the pipe section inside the tank. The size of the coarse holes is smaller than the size of the pebbles outside the pipe. The flange end of the sleeve (5) is sealed by a plug (7) connected to several sets of bolts and nuts. A screen pipe (6) is installed inside the sleeve (5). The outer diameter of the screen pipe (6) is smaller than the inner diameter of the sleeve (5). The two form a ring space. Several fine holes are machined on the screen pipe (6). The size of the fine holes is smaller than the size of the filter media particles to prevent the filter media from mixing into the water to be discharged.

2. The drainage assembly for easy replacement of the screen pipe at the bottom of an oilfield wastewater filter tank according to claim 1, characterized in that: In order to accurately connect and position the screen tube (6), a positioning hole (403) is machined on the inner wall of the connector (4), and the inner diameter of the positioning hole (403) is in clearance fit with the outer diameter of the screen tube (6); a short support cylinder (701) is provided on the inner wall side of the plug (7), and the outer diameter of the short support cylinder (701) is in clearance fit with the inner diameter of the screen tube (6); one end of the screen tube (6) is inserted into the positioning hole (403), and the other end is sleeved on the short support cylinder (701) to prevent movement.

3. The drainage assembly for easy replacement of the screen pipe at the bottom of an oilfield wastewater filter tank according to claim 1, characterized in that: In order to ensure that the annular gap between the screen tube (6) and the sleeve (5) is uniform, four small support plates (9) are welded and connected at a certain interval on the screen tube (6), and the four small support plates (9) are evenly distributed in the circumferential direction.

4. The drainage assembly for easy replacement of the screen pipe at the bottom of an oilfield wastewater filter tank according to claim 1, characterized in that: In order to enhance the support strength of the manifold (2), several support legs (3) are provided at a certain distance from the lower part of the two manifolds (2), and the lower end of the support legs (3) is welded to the lower end cap of the filter tank (10).

5. A drainage assembly for easy replacement of the screen pipe at the bottom of an oilfield wastewater filter tank according to claim 1, characterized in that: To ensure the seal between the flange end of the sleeve (5) and the plug (7), a sealing ring (8) is provided between them.

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