A backflow prevention structure for a liquid inlet and return elbow pipe used in a coal mine

Abstract

The utility model discloses a kind of anti-backflow structures for coal mine inlet and back liquid elbow, including first pipeline, one end of the first pipeline is communicated with second pipeline, the inside of the second pipeline is provided with anti-backflow component. The anti-backflow component includes flow pipe, mounting block and torsion spring, the mounting block and torsion spring are connected with baffle, the elastic structure of multiple mounting blocks, torsion springs, baffle component on the anti-backflow component, the utility model adopts series type two-stage filtration design, through the coarse filtration zone of the filter cartridge outer wall diameter D1 (diameter is larger), first pass the liquid to carry out first filtration, accurately intercept the larger impurities in it;Subsequently, liquid enters the inside of filter cartridge, again flow through the fine filtration zone of the diameter D2 (D2

Description

Technical Field

[0001] This utility model mainly relates to the field of coal mining technology, specifically to an anti-backflow structure for inlet and outlet liquid bends in coal mines. Background Technology

[0002] In the field of coal mining technology, the inlet and return fluid bends are key components of the liquid conveying system. The liquids they convey (such as hydraulic oil, coolant, etc.) often contain a large number of impurities of different particle sizes. These impurities may come from coal slag, rock fragments, equipment wear particles, etc. during the mining process.

[0003] Traditional inlet and outlet liquid bend anti-backflow structures typically only have a single anti-backflow function. This leads to the accumulation of impurities in the gaps and sealing surfaces of the anti-backflow components during long-term use. This not only wears down the components and reduces the anti-backflow sealing performance, but may also directly cause blockage of the anti-backflow channel, seriously affecting the anti-backflow effect, and even causing liquid to flow backward, interfering with the normal operation of the entire coal mine liquid conveying system, increasing the risk of equipment failure and maintenance costs. Utility Model Content

[0004] This utility model provides a solution that is significantly different from existing technologies, addressing the problem that existing solutions are too simplistic. It mainly provides an anti-backflow structure for inlet and return liquid bends in coal mines, which solves the technical problems mentioned in the background art. The traditional anti-backflow structure for inlet and return liquid bends has a single function, and long-term use can easily lead to the accumulation of impurities, causing component wear, reduced sealing performance, and channel blockage, affecting the anti-backflow effect, and even causing reverse flow of liquid, interfering with system operation, and increasing the risk of equipment failure and maintenance costs.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A backflow prevention structure for inlet and outlet liquid bends in coal mines includes a first pipe, one end of which is connected to a second pipe, and an anti-backflow component is installed inside the second pipe.

[0006] The anti-backflow assembly includes a flow pipe, a mounting block, and a torsion spring. Both the mounting block and the torsion spring are connected to a baffle. The anti-backflow assembly consists of an elastic structure composed of multiple mounting blocks, torsion springs, and baffles to prevent liquid backflow.

[0007] More preferably, the outer wall of the first pipe is provided with an installation pipe, a filter cylinder is provided inside the installation pipe, a positioning block is provided near the bottom of the outer wall of the filter cylinder, and a positioning groove matching the positioning block is provided inside the installation pipe.

[0008] More preferably, the outer wall of the filter cylinder is provided with a plurality of filter holes, and the liquid inlet side of the outer wall of the filter cylinder is provided with a large round hole filter area, and the liquid outlet side is provided with a small round hole filter area.

[0009] More preferably, the inner wall of the mounting tube is provided with an internal thread near the bottom that matches the threaded cap, and the threaded cap is detachably connected to the mounting tube through the internal thread.

[0010] More preferably, the flow tube is installed inside the second pipe, and an installation ring is provided on the outer wall of the flow tube near one end. The outer wall of the installation ring is provided with multiple installation holes along the circumference. Each installation hole is provided with an installation rod and a torsion spring. The outer wall of the installation rod is rotatably connected to the installation block.

[0011] More preferably, the inner wall of the mounting ring is provided with a radial support frame near one end, the support frame is composed of multiple triangular rods evenly distributed around the circumference, and the flat end of the support frame faces the liquid outlet side; an annular sealing groove is provided on one side of the baffle near the periphery, and a sealing ring is embedded in the sealing groove.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This anti-backflow structure employs a series-connected two-stage filtration system. Larger impurities are first intercepted in the coarse filtration zone (D1) on the outer wall of the filter cartridge, and then finer impurities are removed in the fine filtration zone (D2 < D1) on the drain side. This process effectively removes impurities of different particle sizes from the liquid, significantly improving the filtration effect. Compared to traditional anti-backflow structures, this design avoids clogging caused by impurities in the liquid, which would otherwise affect the anti-backflow performance.

[0013] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the exploded structure of this utility model; Figure 3 This is an enlarged structural schematic diagram of the anti-backflow component of this utility model; Figure 4 In this utility model Figure 3 Enlarged structural diagram at point A in the diagram; Figure 5 This is a side view magnified structural diagram of the anti-backflow component of this utility model.

[0015] Numbering on the map: 1. First pipe; 101. Installation pipe; 2. Second pipe; 3. Filter cartridge; 4. Threaded cap; 5. Anti-backflow assembly; 501. Flow pipe; 502. Mounting ring; 503. Support frame; 504. Mounting rod; 505. Mounting block; 506. Torsion spring; 507. Baffle. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0017] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Please refer to the appendix carefully. Figure 1-5 A backflow prevention structure for inlet and outlet liquid bends in coal mines includes a first pipe 1, one end of which is connected to a second pipe 2 (the first pipe 1 and the second pipe 2 can be connected by clamps), and an anti-backflow component 5 is provided inside the second pipe 2.

[0019] The anti-backflow assembly 5 includes a flow pipe 501, a mounting block 505, and a torsion spring 506. The mounting block 505 and the torsion spring 506 are both fixedly connected to the baffle 507. The anti-backflow assembly 5 is an elastic structure composed of multiple mounting blocks 505, torsion springs 506, and baffles 507 to prevent liquid backflow.

[0020] In this embodiment, as Figure 1 and Figure 2 As shown, the outer wall of the first pipe 1 is radially connected to an installation pipe 101. The inner wall of the installation pipe 101 and the outer wall of the filter cylinder 3 form a clearance fit. Near the bottom of the outer wall of the filter cylinder 3, at least two positioning blocks are evenly distributed circumferentially. The inner wall of the installation pipe 101 is correspondingly provided with a positioning groove. The top end face of the filter cylinder 3 is provided with an annular sealing groove, and a sealing ring is embedded in the sealing groove. When the filter cylinder 3 is inserted into the installation pipe 101, the positioning blocks and the positioning groove form a guiding fit. The outer wall of the filter cylinder 3 and the inner wall of the installation pipe 101 form a sliding seal. The top end face of the filter cylinder 3 and the inner wall of the first pipe 1 form a surface seal. The peripheral wall of the filter cylinder 3 is provided with several filter holes for filtering impurities in the liquid flowing through the first pipe 1.

[0021] In this embodiment, as Figure 2As shown, the outer wall of the filter cylinder 3 is provided with several filter holes. The liquid inlet side of the outer wall of the filter cylinder 3 is provided with a large round hole filter area, and the liquid outlet side is provided with a small round hole filter area. The coarse filtration area is uniformly distributed with large round hole filter holes of diameter D1, and the fine filtration area is uniformly distributed with small round hole filter holes of diameter D2, where D1 > D2. The filter cylinder 3 forms a series two-stage filtration structure through the coarse filtration area and the fine filtration area, which is used to perform coarse filtration and fine filtration on the liquid flowing through the first pipe 1 in sequence.

[0022] In this embodiment, as Figure 1 and Figure 2 As shown, the inner wall of the mounting tube 101 is provided with an internal thread near the bottom. The internal thread matches the threaded cap 4, and the threaded cap 4 forms a detachable connection with the mounting tube 101 through the internal thread. When the threaded cap 4 is tightened with the mounting tube 101, the top end face of the threaded cap 4 abuts against the bottom end face of the filter cylinder 3 to press the filter cylinder 3 against the inner wall of the first pipe 1. After the threaded cap 4 is removed, the filter cylinder 3 can be taken out of the mounting tube 101 for cleaning.

[0023] In this embodiment, as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the flow pipe 501 is installed inside the second pipe 2. An installation ring 502 is fixedly installed on the outer wall of the flow pipe 501 near one end (the installation ring 502 is installed inside the second pipe 2). Multiple installation holes are circumferentially formed on the outer wall of the installation ring 502 (corrosion-resistant telescopic protective covers can be installed at the installation holes to connect the installation ring 502 and the baffle 507, protecting the torsion spring 506). An installation rod 504 and a torsion spring 506 are fixedly installed in each installation hole. The installation rod 504 is rotatably connected to the installation block 505. The installation block 505 and the torsion spring 506 are connected... The mounting rods 504 are symmetrically distributed along their vertical centerline. The mounting rods 504, mounting blocks 505, torsion springs 506, and baffles 507 constitute a set of anti-backflow units. Multiple sets of anti-backflow units are provided and arranged in a ring. When one side of the baffle 507 is subjected to liquid pressure, and this pressure is greater than the sum of the weight of the baffle 507 and the elastic force of the torsion spring 506, the baffle 507 rotates around the mounting rods 504 with the mounting blocks 505 to open the channel and allow the liquid to pass through smoothly. After the liquid drainage is completed, the baffle 507 returns to its original position and closes under the elastic force of the torsion spring 506 to prevent liquid backflow.

[0024] In this embodiment, as Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a radial support frame 503 is fixedly installed on the inner wall of the mounting ring 502 near one end. The support frame 503 is composed of multiple triangular rods evenly distributed around the circumference. The flat end of the support frame 503 (the inclination angle of the liquid-facing surface of the support frame 503 is θ=15°-20° to reduce eddy current generation) faces the liquid outlet side. An annular sealing groove is provided on one side of the baffle 507 near the perimeter, and a sealing ring is embedded in the sealing groove. When several baffles 507 are closed, the baffles 507 contact the flow pipe 501 and the support frame 503. Under the elastic force of the torsion spring 506, the sealing ring on the baffle 507 forms an interference fit with the flow pipe 501 and the support frame 503 to improve the sealing performance.

[0025] The specific operating procedure of this utility model is as follows: Connect the corresponding inlet / outlet bend to the corresponding first pipe 1 using clamps, and connect the corresponding outlet pipe to the second pipe 2. When the liquid flows through the first pipe 1, it first enters the filtration area formed by the mounting pipe 101 and the filter cylinder 3. The liquid first contacts the coarse filtration area (large hole filtration area) on the outer wall of the filter cylinder 3. The large hole filtration holes with a diameter of D1 (D1 is relatively large) will first perform coarse filtration on the liquid, intercepting larger impurities. Subsequently, the liquid enters the interior of the filter cylinder 3 and flows through the fine filtration area (small hole filtration area) on the drain side. The small hole filtration holes with a diameter of D2 (D2 < D1) will perform secondary fine filtration on the liquid, further removing fine impurities. Through this series-connected two-stage filtration structure, impurities of different particle sizes in the liquid can be removed, improving the filtration effect. During the filtration process, the filter cartridge 3 is guided by the positioning block and the positioning groove on the inner wall of the mounting pipe 101 to ensure accurate installation; its outer wall forms a sliding seal with the inner wall of the mounting pipe 101, and its top end face forms a surface seal with the inner wall of the first pipe 1 through a sealing ring, effectively preventing unfiltered liquid from leaking through the gaps. At the same time, the threaded cap 4 is tightened with the mounting pipe 101 through its internal thread, pressing the top of the filter cartridge 3 against the inner wall of the first pipe 1, further ensuring the sealing performance and the stability of the filter cartridge 3. The filtered liquid flows from the first pipe 1 into the second pipe 2, at which point the anti-backflow component 5 begins to function. When the liquid flows through the flow pipe 501 (which can be tapered) towards the baffle 507, it exerts pressure on the baffle 507. When this pressure exceeds the sum of the weight of the baffle 507 and the elastic force of the torsion spring 506, the baffle 507 will rotate around the mounting rod 504 with the mounting block 505, opening the channel in the flow pipe 501 and allowing the liquid to pass through smoothly.

[0026] When the drainage is complete and the liquid pressure disappears, the spring force of the torsion spring 506 will cause the baffle 507 to reset and close. At this time, the sealing ring on one side of the baffle 507 forms an interference fit with the inner wall of the flow pipe 501 and the support frame 503. Combined with multiple sets of annularly distributed anti-backflow units, it can block the reverse flow of liquid and realize the anti-backflow function. In addition, when it is necessary to clean the filter cartridge 3, simply remove the threaded cap 4 to take the filter cartridge 3 out of the installation tube 101. After cleaning, reinstall and tighten the threaded cap 4 to restore the normal filtration function of the device. The operation is convenient.

[0027] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A backflow prevention structure for inlet and outlet liquid bends in coal mines, comprising a first pipe (1), characterized in that: One end of the first pipe (1) is connected to the second pipe (2), and the second pipe (2) is provided with an anti-backflow component (5); The anti-backflow assembly (5) includes a flow pipe (501), a mounting block (505) and a torsion spring (506). The mounting block (505) and the torsion spring (506) are both connected to a baffle (507). The anti-backflow assembly (5) is an elastic structure composed of multiple mounting blocks (505), torsion springs (506) and baffles (507) to prevent liquid backflow.

2. The anti-backflow structure for inlet and outlet fluid bends in coal mines according to claim 1, characterized in that: The outer wall of the first pipe (1) is provided with an installation pipe (101), and a filter cylinder (3) is provided inside the installation pipe (101). A positioning block is provided near the bottom of the outer wall of the filter cylinder (3), and a positioning groove matching the positioning block is opened inside the installation pipe (101).

3. The anti-backflow structure for inlet and outlet fluid bends in coal mines according to claim 2, characterized in that: The outer wall of the filter cylinder (3) is provided with a number of filter holes. The liquid inlet side of the outer wall of the filter cylinder (3) is provided with a large round hole filter area, and the liquid outlet side is provided with a small round hole filter area.

4. The anti-backflow structure for inlet and outlet fluid bends in coal mines according to claim 2, characterized in that: The inner wall of the mounting tube (101) near the bottom is provided with an internal thread that matches the threaded cap (4), and the threaded cap (4) is detachably connected to the mounting tube (101) through the internal thread.

5. The anti-backflow structure for inlet and outlet fluid bends in coal mines according to claim 1, characterized in that: The flow tube (501) is installed inside the second pipe (2). The outer wall of the flow tube (501) is provided with an installation ring (502) near one end. The outer wall of the installation ring (502) is provided with multiple installation holes along the circumferential direction. Each installation hole is provided with an installation rod (504) and a torsion spring (506). The outer wall of the installation rod (504) is rotatably connected to the installation block (505).

6. The anti-backflow structure for inlet and outlet fluid bends in coal mines according to claim 5, characterized in that: The inner wall of the mounting ring (502) is provided with a radial support frame (503) near one end. The support frame (503) is composed of multiple triangular rods evenly distributed around the circumference. The flat end of the support frame (503) faces the liquid outlet side. The baffle (507) is provided with an annular sealing groove near the four edges on one side. A sealing ring is embedded in the sealing groove.

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