A non-metallic pipe fitting connection structure for oil transportation

Abstract

The present invention relates to the technical field of pipe fitting connection structures, and specifically relates to a non-metallic pipe fitting connection structure for oil transportation, which includes a connecting pipe, a fixing structure, a sealing structure, a conveying pipe, a filtering structure, an installation structure, and an opening and closing structure. The fixing structure is used in cooperation with the sealing structure. The setting of the fixing structure facilitates the quick docking of two pipe fittings, and at the same time facilitates the adjustment of the distance that the pipe orifice extends into the connector, solves the problem of difficult docking due to the large length of the pipeline, and reduces the construction difficulty. The installation structure is used in cooperation with the filtering structure. The setting of the filtering structure facilitates the filtering of impurities mixed in the oil, and at the same time facilitates the replacement or cleaning of the filter screen, and blocks the residual oil in the pipeline from flowing out from the pipe orifice when the connector is disassembled, with simple operation and strong flexibility. The setting of the opening and closing structure solves the problem that after the valve is closed, the residual oil in the pipeline leaks from the docking part when the connector is disassembled.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe fitting connection structures, and specifically to a non-metallic pipe fitting connection structure for oil transportation. Background Art

[0002] Non-metallic pipe fittings for oil transportation are pipe fittings made of non-metallic materials used in oil transportation pipeline systems. These pipe fittings play an important role in long-distance oil transportation, internal pipeline systems of oil depots, and pipeline connections of petrochemical plants. They are an important part of the oil pipeline system. When multiple pipes are butt-jointed, a pipe fitting connection structure is often borrowed to connect multiple pipe fittings into a whole.

[0003] When traditional non-metallic pipes are butt-jointed, they usually adopt the method of fixing with flange plates or clamps. Therefore, a sealing ring is usually arranged between the pipeline and the connector. However, since the sealing ring is in a high-temperature and high-pressure state for a long time, when the sealing ring needs to be replaced, the connector needs to be removed first. At this time, the pipeline is no longer in a sealed state. Therefore, when removing the pipeline connector, the pipeline valve will be closed first. However, the oil remaining in the pipeline is likely to leak from the pipe orifice connection, resulting in waste of resources and poor practicability.

[0004] When non-metallic pipes are butt-jointed, they usually adopt methods such as threaded connection or sleeve connection. However, due to the gaps at the joints with threaded pipe fittings, leakage problems may occur after a long time in a high-temperature and high-pressure environment. Therefore, in a high-temperature and high-pressure environment, hot melting or clamp fixing methods are usually adopted. However, hot melting or clamp fixing is not convenient for disassembly and maintenance. At the same time, when parts such as sealing rings need to be disassembled or replaced, bolts need to be rotated repeatedly, and the operation process is cumbersome and the flexibility is poor.

[0005] Since oil may contain impurities such as sediment and rust particles, during pipeline transportation, a filtering structure is usually not provided. Therefore, if impurities enter equipment such as oil pumps and valves, it will accelerate the wear of the equipment, and the practicability is poor. Summary of the Invention

[0006] In view of the problems in the prior art, the present invention provides a non-metallic pipe fitting connection structure for oil transportation.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a non-metallic pipe fitting connection structure for oil transportation, including a connecting pipe, a fixing structure installed on the connecting pipe, a sealing structure connected to the fixing structure, a conveying pipe connected to the sealing structure, a filtering structure arranged inside the connecting pipe, an installation structure installed on the connecting pipe, and a closing and opening structure arranged inside the connecting pipe;

[0008] The opening and closing structure includes an installation pipe and a driving ring slidably connected to the outer wall of the installation pipe. The installation pipe is clamped inside the connecting pipe. The end of the installation pipe is fixedly connected to a conveying pipe. The driving ring is slidably connected to the inner wall of the connecting pipe. A tension spring is fixedly connected between the end of the installation pipe and the driving ring. Four connecting rods are fixedly connected to the inner side of the driving ring. Four sliding grooves are formed on the side wall of the installation pipe. The connecting rods are slidably connected to the sliding grooves. A connecting seat is fixedly connected between the four connecting rods. The end of the connecting seat is fixedly connected to a rubber plug. Two driving rods are fixedly connected to the surface of the driving ring close to the connecting seat. The driving rods are slidably connected to the installation pipe. The driving rods cooperate with the sealing structure.

[0009] Specifically, the cross-section of the connecting seat is in a "T" shape, and the cross-section of the rubber plug is in a "convex" shape.

[0010] Specifically, the fixing structure includes a first fixing ring and three driving blocks fixedly connected to the outer wall of the first fixing ring. One first fixing ring is fixedly connected to each end of the connecting pipe. A second fixing ring is provided on the side of each of the two first fixing rings. Three fixing clips are fixedly connected to the outer wall of the second fixing ring. The inner sides of the fixing clips are in contact with the driving blocks.

[0011] Specifically, an installation rod is fixedly connected between the two second fixing rings. A nut is threadedly connected to the end of the installation rod. The nut is in contact with one of the second fixing rings.

[0012] Specifically, the driving block is in an "L" shape, and an inclined surface is provided at the end of the driving block. The fixing clip is slidably matched with the inclined surface.

[0013] Specifically, the sealing structure includes a plurality of rubber blocks and clamping strips fixedly connected to the rubber blocks. A plurality of rubber blocks are in contact between the first fixing ring and the second fixing ring. The plurality of rubber blocks are clamped to each other through the clamping strips. The bottom surface of the rubber block is in contact with the outer wall of the conveying pipe. An iron sheet is fixedly connected to the bottom surface of the rubber block. The iron sheet is in contact with the conveying pipe.

[0014] Specifically, the plurality of rubber blocks form an annular structure. The cross-section of the rubber block is in a trapezoidal shape. The side surface of the rubber block is in contact with the driving rod.

[0015] Specifically, the installation structure includes an installation sleeve and a guide rod fixedly connected to the inner wall of the installation sleeve. The installation sleeve is fixedly connected to the outer wall of the connecting pipe. The inside of the installation sleeve is matched with a filtering structure.

[0016] Specifically, the filtering structure includes a fixing ring and a mounting plate slidably connected inside the fixing ring. The inner wall of the connecting pipe is fixedly connected with the fixing ring. One side of the fixing ring abuts against the mounting pipe, and the other side of the fixing ring abuts against another conveying pipe. A first filter screen and a second filter screen are respectively clamped on the mounting plate. A rubber pad abuts between the first filter screen and the second filter screen. Two limiting strips are slidably connected to the mounting plate. A first spring is fixedly connected between the end of the limiting strip and the mounting plate. The limiting strip abuts against the second filter screen.

[0017] Specifically, the mounting plate is slidably connected to the mounting sleeve. The end of the mounting plate is slidably connected to the guiding rod. A second spring is fixedly connected between the end of the mounting plate and the inner wall of the mounting sleeve. The end of the mounting sleeve is fixedly connected with a mounting cover. A rubber strip abuts between the inner side of the mounting cover and the mounting plate. The rubber strip is slidably connected to the guiding rod.

[0018] The beneficial effects of the present invention are:

[0019] For a non-metallic pipe fitting connection structure for oil transportation of the present invention, a fixing structure is installed on the connecting pipe. The fixing structure is used in cooperation with the sealing structure. The setting of the fixing structure facilitates the rapid docking of two pipe fittings, and at the same time facilitates the adjustment of the distance that the pipe orifice extends into the connector, solves the problem of difficult docking due to the large length of the pipeline, and reduces the construction difficulty.

[0020] For a non-metallic pipe fitting connection structure for oil transportation of the present invention, an installation structure is installed on the connecting pipe. The installation structure is used in cooperation with the filtering structure. The setting of the filtering structure facilitates the filtering of impurities mixed in the oil, and at the same time facilitates the replacement or cleaning of the filter screen, and blocks the residual oil in the pipeline from flowing out of the pipe orifice when disassembling the connector. The operation is simple and the flexibility is strong.

[0021] For a non-metallic pipe fitting connection structure for oil transportation of the present invention, a closing and opening structure is provided inside the connecting pipe. The setting of the closing and opening structure solves the problem that the residual oil in the pipeline leaks from the docking place when disassembling the connector after closing the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the drawings and embodiments.

[0023] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of a non-metallic pipe fitting connection structure for oil transportation provided by the present invention;

[0024] Figure 2 It is a schematic diagram of the connection structure between the mounting pipe and the driving ring of the present invention;

[0025] Figure 3Schematic diagram of the connection structure between the connecting pipe and the installation pipe of the present invention;

[0026] Figure 4 is Figure 3 Schematic diagram of the enlarged structure of part A shown in;

[0027] Figure 5 is Figure 3 Schematic diagram of the enlarged structure of part B shown in;

[0028] Figure 6 Schematic diagram of the connection structure between the mounting plate and the mounting sleeve of the present invention;

[0029] Figure 7 is Figure 6 Schematic diagram of the enlarged structure of part C shown in;

[0030] Figure 8 Schematic diagram of the connection structure between the mounting plate and the limiting strip of the present invention;

[0031] Figure 9 Schematic diagram of the connection structure between the rubber block and the clamping strip of the present invention.

[0032] In the figure: 1, connecting pipe; 2, fixing structure; 201, first fixing ring; 202, driving block; 203, second fixing ring; 204, fixing clip; 205, mounting rod; 206, nut; 3, sealing structure; 301, rubber block; 302, clamping strip; 303, iron sheet; 4, conveying pipe; 5, filtering structure; 501, fixing ring; 502, mounting plate; 503, first filter screen; 504, rubber pad; 505, second filter screen; 506, limiting strip; 507, first spring; 6, mounting structure; 601, mounting sleeve; 602, guide rod; 603, second spring; 604, mounting cover; 605, rubber strip; 7, opening and closing structure; 701, installation pipe; 702, driving ring; 703, pulling spring; 704, sliding groove; 705, connecting rod; 706, connecting seat; 707, rubber plug; 708, driving rod. Detailed implementation manners

[0033] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0034] Such as Figure 1 、 Figure 3 、 Figure 4 、and Figure 7As shown in the figure, a non-metallic pipe fitting connection structure for oil transportation according to the present invention includes a connecting pipe 1, a fixing structure 2 installed on the connecting pipe 1, a sealing structure 3 connected to the fixing structure 2, a conveying pipe 4 connected to the sealing structure 3, a filtering structure 5 provided inside the connecting pipe 1, an installation structure 6 installed on the connecting pipe 1, and a switching structure 7 provided inside the connecting pipe 1. The fixing structure 2 includes a first fixing ring 201 and three driving blocks 202 fixedly connected to the outer wall of the first fixing ring 201. One first fixing ring 201 is fixedly connected to each end of the connecting pipe 1. A second fixing ring 203 is provided on the side of each of the two first fixing rings 201. Three fixing clips 204 are fixedly connected to the outer wall of the second fixing ring 203. The inner sides of the fixing clips 204 are in contact with the driving blocks 202. An installation rod 205 is fixedly connected between the two second fixing rings 203. The end of the installation rod 205 is threadedly connected with a nut 206. The nut 206 is in contact with one of the second fixing rings 203. The driving block 202 has an "L" - shaped structure, and the end of the driving block 202 is provided with an inclined surface. The fixing clip 204 is in sliding cooperation with the inclined surface. Then, the front part of the conveying pipe 4 passes through the second fixing ring 203, the circular structure and the central position of the connecting pipe 1 in sequence. Since one first fixing ring 201 is fixedly connected to each end of the connecting pipe 1, at this time, the circular structure composed of a plurality of rubber blocks 301 is located between the first fixing ring 201 and the second fixing ring 203. The end of the conveying pipe 4 passes through the tail of the connecting pipe 1. Then, the installation pipe 701 is fixed to the end of the conveying pipe 4. Then, the connecting pipe 1 is pulled towards the tail, so that the end of the conveying pipe 4 together with the installation pipe 701 is placed in the internal cavity of the connecting pipe 1 until the installation pipe 701 is completely engaged inside the connecting pipe 1. Then, the fixing ring 501 is fixed inside the connecting pipe 1, so that the side wall of the fixing ring 501 is in contact with the installation pipe 701. Finally, the circular structure composed of another second fixing ring 203 and rubber blocks 301 is sleeved on the end of another conveying pipe 4, and the front end of this conveying pipe 4 is inserted into the connecting pipe 1 and abuts against the fixing ring 501. At this time, the preliminary docking between the two conveying pipes 4 is completed. Then, the front and rear second fixing rings 203 are rotated in sequence, so that the three fixing clips 204 on the second fixing ring 203 are respectively aligned with the three driving blocks 202 on the first fixing ring 201. The first fixing ring 201 and the second fixing ring 203 at the other end of the connecting pipe 1 repeat the same operation, and the installation rod 205 is fixed between the second fixing rings 203 at both ends through the nut 206, further improving the firmness. At this time, the docking of the two conveying pipes 4 is completed, with simple operation and high installation efficiency.

[0035] Specifically, as Figure 1 , Figure 3 , Figure 4 andFigure 9 As shown, the sealing structure 3 includes a plurality of rubber blocks 301 and a clamping strip 302 fixedly connected to the rubber blocks 301. A plurality of rubber blocks 301 are abutted between the first fixing ring 201 and the second fixing ring 203. The plurality of rubber blocks 301 are clamped to each other through the clamping strip 302. The bottom surface of the rubber block 301 abuts against the outer wall of the conveying pipe 4. A iron sheet 303 is fixedly connected to the bottom surface of the rubber block 301, and the iron sheet 303 abuts against the conveying pipe 4. The plurality of rubber blocks 301 form an annular structure. The cross section of the rubber block 301 is in a trapezoidal structure. The side surface of the rubber block 301 abuts against the driving rod 708. By clamping the plurality of rubber blocks 301 to each other through the clamping strip 302 to form an annular structure, the sealing effect is improved. At the same time, when the rubber block 301 is aged or damaged, it is convenient to disassemble the old one as a whole and replace it with a new rubber block 301, with strong flexibility. Since the upper half of the rubber block 301 is in a trapezoidal structure, when the first fixing ring 201 and the second fixing ring 203 are clamped towards the middle, it drives the plurality of rubber blocks 301 to tightly abut against the conveying pipe 4 towards the center. At the same time, since the iron sheet 303 is provided on the bottom surface of the rubber block 301, the iron sheet 303 is embedded into the non-metal conveying pipe 4 during the process of squeezing towards the center, thereby improving the firmness. At the same time, it can effectively adjust the distance that the end of the conveying pipe 4 extends into the connecting pipe 1, thus avoiding the problem of trimming the end due to the large length of the conveying pipe 4 during the docking process, and reducing the construction difficulty.

[0036] Specifically, such as Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, the opening and closing structure 7 includes a mounting tube 701 and a driving ring 702 slidably connected to the outer wall of the mounting tube 701. The mounting tube 701 is engaged with the interior of the connecting tube 1. The end of the mounting tube 701 is fixedly connected to the delivery tube 4. The driving ring 702 is slidably connected to the inner wall of the connecting tube 1. A tension spring 703 is fixedly connected between the end of the mounting tube 701 and the driving ring 702. Four connecting rods 705 are fixedly connected to the inner side of the driving ring 702. 01 is provided with four sliding grooves 704, the connecting rods 705 are slidably connected to the sliding grooves 704, a connecting seat 706 is fixedly connected between the four connecting rods 705, the end of the connecting seat 706 is fixedly connected to a rubber plug 707, and two driving rods 708 are fixedly connected to the side of the driving ring 702 close to the connecting seat 706, the driving rods 708 are slidably connected to the mounting tube 701, the driving rods 708 cooperate with the sealing structure 3, and the cross section of the connecting seat 706 is " The cross section of the rubber plug 707 is a "convex" structure; when it is necessary to replace the rubber block 301 and other parts, first close the valve on the pipeline. In order to solve the problem of the oil remaining in the pipeline flowing out from the pipe mouth of the delivery pipe 4 when the connector is disassembled, it is only necessary to rotate the two second fixing rings 203 in the opposite direction so that the first fixing ring 201 and the second fixing ring 203 no longer clamp the rubber block 301, and move the annular structure formed by the rubber block 301 toward the two ends of the connecting pipe 1. At this time, the rubber block 301 on the front part of the delivery pipe 4 no longer conflicts with the driving rod 708, and then the driving ring 702 slides along the outer wall of the mounting pipe 701 toward the front part of the delivery pipe 4 under the reset action of the tension spring 703, and then the driving ring 702 drives the four connecting rods 705 to slide along the slide groove 704, and the connecting rod 705 drives the connecting seat 706 and the rubber plug 707 to move toward the end of the mounting pipe 701 until the rubber plug 7 07 and the raised inner wall of the end of the mounting tube 701 conflict with each other. Since the mounting tube 701 is fixed to the end of the delivery tube 4, the interior of the delivery tube 4 is in a sealed state at this time, which effectively avoids the problem of oil leaking from the pipe mouth of the delivery tube 4 when replacing the rubber block 301, thereby improving practicality. Moreover, since the end of the mounting tube 701 away from the drive ring 702 is made of rubber material, the residual oil is prevented from leaking out from here, and then the rubber block 301 at the other end is replaced. When the parts on the connecting tube 1 are replaced, it is only necessary to re-fix the first fixing ring 201 and the second fixing ring 203. At this time, the side wall of the rubber block 301 conflicts with the driving rod 708, so that the driving rod 708 drives the driving ring 702 and the rubber plug 707 to move toward the other end of the mounting tube 701. At this time, the rubber plug 707 and the end of the mounting tube 701 are no longer closed, thereby not blocking the oil from flowing inside the mounting tube 701, and having strong flexibility.

[0037] Specifically, such as Figure 1 、Figure 3 , Figure 6 and Figure 7 As shown in Figure 3 , Figure 6 and Figure 7 , the installation structure 6 includes an installation sleeve 601 and a guide rod 602 fixedly connected to the inner wall of the installation sleeve 601. An installation sleeve 601 is fixedly connected to the outer wall of the connecting pipe 1. A filtering structure 5 is fitted inside the installation sleeve 601. The installation plate 502 is slidably connected to the installation sleeve 601. The end of the installation plate 502 is slidably connected to the guide rod 602. A second spring 603 is fixedly connected between the end of the installation plate 502 and the inner wall of the installation sleeve 601. An installation cover 604 is fixedly connected to the end of the installation sleeve 601. A rubber strip 605 abuts between the inner side of the installation cover 604 and the installation plate 502. The rubber strip 605 is slidably connected to the guide rod 602. Just remove the installation cover 604 from the installation sleeve 601. At this time, the installation plate 502 equipped with the first filter screen 503 and the second filter screen 505, together with the rubber strip 605, pops out along the guide rod 602 under the reset action of the second spring 603, thereby facilitating the quick removal of the installation plate 502 from the inside of the installation sleeve 601, improving the operation efficiency, and the setting of the rubber strip 605 further improves the sealing performance inside the connecting pipe 1.

[0038] Specifically, as Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the filtering structure 5 includes a fixing ring 501 and a mounting plate 502 slidably connected inside the fixing ring 501. The inner wall of the connecting pipe 1 is fixedly connected with the fixing ring 501. One side of the fixing ring 501 abuts against the mounting pipe 701, and the other side of the fixing ring 501 abuts against another conveying pipe 4. A first filter screen 503 and a second filter screen 505 are respectively clamped on the mounting plate 502. A rubber pad 504 is abutted between the first filter screen 503 and the second filter screen 505. Two limiting strips 506 are slidably connected to the mounting plate 502. A first spring 507 is fixedly connected between the end of the limiting strip 506 and the mounting plate 502. The limiting strip 506 abuts against the second filter screen 505. The petroleum flowing through the inside of the mounting pipe 701 finally flows to another conveying pipe 4 through the first filter screen 503 and the second filter screen 505, effectively filtering out impurities such as sediment and rust mixed in the petroleum. And because the sizes of the gaps on the first filter screen 503 and the second filter screen 505 are different, the filtering effect of the impurities is improved, and it is convenient for later cleaning or replacement. Since the filter holes opened on the first filter screen 503 and the second filter screen 505 are both distributed at the central position, when disassembling the connecting piece, the edge of the second filter screen 505 can effectively block the residual petroleum in the conveying pipe 4 and prevent the residual petroleum from leaking from the port. When it is necessary to clean the first filter screen 503 or the second filter screen 505, then take out the mounting plate 502 from the inside of the fixing ring 501, remove the old first filter screen 503 and the second filter screen 505, reinstall the new or cleaned first filter screen 503 and the second filter screen 505 on the mounting plate 502. Just pull out the two limiting strips 506 on the mounting plate 502, then clamp the first filter screen 503 inside the mounting plate 502, then press a rubber pad 504 tightly against the first filter screen 503, then press the second filter screen 505 tightly against the rubber pad 504, release the limiting strips 506, and the limiting strips 506 slide towards the central position of the mounting plate 502 under the reset action of the first spring 507 and abut against the second filter screen 505. Finally, reinstall the mounting plate 502 inside the circular fixing ring 501. At this time, the replacement or cleaning of the first filter screen 503 and the second filter screen 505 is completed, which can effectively filter out the impurities mixed in the petroleum and has strong practicability.

[0039] When the present invention is in use, a plurality of rubber blocks 301 are engaged with each other through the clamping strips 302 to form an annular structure, which improves the sealing effect. At the same time, when the rubber blocks 301 are aged or damaged, it is convenient to disassemble the old ones from the whole and replace them with new rubber blocks 301, with strong flexibility. Then, the front part of the conveying pipe 4 sequentially passes through the central positions of the second fixing ring 203, the annular structure and the connecting pipe 1. Since a first fixing ring 201 is fixedly connected to each end of the connecting pipe 1, at this time, the annular structure formed by the plurality of rubber blocks 301 is located between the first fixing ring 201 and the second fixing ring 203, and the end of the conveying pipe 4 passes out from the tail of the connecting pipe 1. Then, the installation pipe 701 is fixed to the end of the conveying pipe 4, and the connecting pipe 1 is pulled towards the tail, so that the end of the conveying pipe 4 together with the installation pipe 701 is placed in the inner cavity of the connecting pipe 1 until the installation pipe 701 is completely engaged in the connecting pipe 1. Then, the fixing ring 501 is fixed in the connecting pipe 1, and the side wall of the fixing ring 501 abuts against the installation pipe 701. Finally, another annular structure composed of the second fixing ring 203 and the rubber blocks 301 is sleeved on the end of another conveying pipe 4, and the front end of the conveying pipe 4 is inserted into the connecting pipe 1 and abuts against the fixing ring 501. At this time, the preliminary docking between the two conveying pipes 4 is completed. Then, the front and rear second fixing rings 203 are rotated in sequence, so that the three fixing clips 204 on the second fixing ring 203 are respectively aligned with the three driving blocks 202 on the first fixing ring 201. Since the fixing clip 204 and the inclined surface on the driving block 202 are in sliding fit, when the fixing clip 204 is rotated, the first fixing ring 201 and the second fixing ring 203 clamp the middle rubber block 301. Since the upper half of the rubber block 301 is in a trapezoidal structure, when the first fixing ring 201 and the second fixing ring 203 are clamped towards the middle, the plurality of rubber blocks 301 are driven to tightly press against the conveying pipe 4 in the central direction. At the same time, since an iron sheet 303 is provided on the bottom surface of the rubber block 301, the iron sheet 303 is embedded into the non-metallic conveying pipe 4 during the process of squeezing towards the center, thereby improving the firmness and effectively adjusting the distance that the end of the conveying pipe 4 extends into the connecting pipe 1, thus avoiding the problem of trimming the end due to the large length of the conveying pipe 4 during the docking process and reducing the construction difficulty. The first fixing ring 201 and the second fixing ring 203 at the other end of the connecting pipe 1 repeat the same operation, and the installation rod 205 is fixed between the second fixing rings 203 at both ends through the nuts 206 to further improve the firmness. At this time, the docking of the two conveying pipes 4 is completed, with simple operation and high installation efficiency;

[0040] When it is necessary to replace the rubber block 301 and other parts, first close the valve on the pipeline. In order to solve the problem of the residual oil in the pipeline flowing out from the pipe mouth of the delivery pipe 4 when the connecting parts are disassembled, it is only necessary to rotate the two second fixing rings 203 in the opposite direction so that the first fixing ring 201 and the second fixing ring 203 no longer clamp the rubber block 301, and move the annular structure formed by the rubber block 301 toward the two ends of the connecting pipe 1. At this time, the rubber block 301 on the front part of the delivery pipe 4 no longer conflicts with the driving rod 708, and then the driving ring 702 slides along the outer wall of the mounting pipe 701 toward the front part of the delivery pipe 4 under the reset action of the tension spring 703, and then the driving ring 702 drives the four connecting rods 705 to slide along the slide groove 704, and the connecting rod 705 drives the connecting seat 706 and the rubber plug 707 to move toward the end of the mounting pipe 701 until the rubber plug 707 and the protrusion at the end of the mounting pipe 701 are aligned. The inner walls of the pipe 701 contact each other, and since the mounting tube 701 is fixed to the end of the delivery tube 4, the interior of the delivery tube 4 is in a sealed state at this time, which effectively avoids the problem of oil leaking from the pipe opening of the delivery tube 4 when replacing the rubber block 301, thereby improving practicality. Moreover, since the end of the mounting tube 701 away from the drive ring 702 is made of rubber material, the residual oil is prevented from leaking out from this point. Then, the rubber block 301 at the other end is replaced. After the replacement of the parts on the connecting tube 1 is completed, it is only necessary to re-fix the first fixing ring 201 and the second fixing ring 203. At this time, the side wall of the rubber block 301 contacts the drive rod 708, so that the drive rod 708 drives the drive ring 702 and the rubber plug 707 to move toward the other end of the mounting tube 701. At this time, the rubber plug 707 and the end of the mounting tube 701 are no longer closed, thereby not blocking the oil from flowing inside the mounting tube 701, and having strong flexibility.

[0041] The oil flowing through the installation pipe 701 finally passes through the first filter 503 and the second filter 505 and flows to the other delivery pipe 4, effectively filtering out impurities such as mud, rust, etc. mixed in the oil. Moreover, since the gaps on the first filter 503 and the second filter 505 are different in size, the filtering effect of impurities is improved, and it is convenient for later cleaning or replacement. Since the filter holes on the first filter 503 and the second filter 505 are all distributed in the center, when the connector is disassembled, the second filter 503 and the second filter 505 are convenient for cleaning or replacement. The edge of 05 can effectively block the residual oil in the delivery pipe 4 to prevent the residual oil from leaking from the port. When the first filter 503 or the second filter 505 needs to be cleaned, it is only necessary to remove the installation cover 604 from the installation sleeve 601. At this time, the installation plate 502 with the first filter 503 and the second filter 505 installed together with the rubber strip 605 will pop outward along the guide rod 602 under the reset action of the second spring 603, thereby facilitating the quick removal of the installation plate 502 from the inside of the installation sleeve 601. , improves the operating efficiency, and the setting of the rubber strip 605 further improves the sealing inside the connecting pipe 1, then remove the mounting plate 502 from the inside of the fixing ring 501, remove the old first filter screen 503 and the second filter screen 505, and reinstall the new or cleaned first filter screen 503 and the second filter screen 505 on the mounting plate 502, just pull out the two limit bars 506 on the mounting plate 502, and then snap the first filter screen 503 into the inside of the mounting plate 502, and then put a rubber strip 605 on the mounting plate 502. The rubber pad 504 is pressed against the first filter screen 503, and then the second filter screen 505 is pressed against the rubber pad 504. The limit bar 506 is loosened. The limit bar 506 slides toward the center position of the mounting plate 502 under the reset action of the first spring 507 and contacts the second filter screen 505. Finally, the mounting plate 502 is reinstalled inside the annular fixing ring 501. At this time, the replacement or cleaning of the first filter screen 503 and the second filter screen 505 is completed, which can effectively filter out impurities mixed in the petroleum and is highly practical.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0043] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A non-metallic pipe fitting connection structure for oil transportation, characterized in that, It includes a connecting pipe (1), a fixing structure (2) installed on the connecting pipe (1), a sealing structure (3) connected to the fixing structure (2), a conveying pipe (4) connected to the sealing structure (3), a filtering structure (5) arranged inside the connecting pipe (1), an installation structure (6) installed on the connecting pipe (1), and an opening and closing structure (7) arranged inside the connecting pipe (1); The opening and closing structure (7) includes an installation pipe (701) and a driving ring (702) slidably connected to the outer wall of the installation pipe (701). The installation pipe (701) is clamped inside the connecting pipe (1). The end of the installation pipe (701) is fixedly connected to the conveying pipe (4). The driving ring (702) is slidably connected to the inner wall of the connecting pipe (1). A tension spring (703) is fixedly connected between the end of the installation pipe (701) and the driving ring (702). Four connecting rods (705) are fixedly connected to the inner side of the driving ring (702). Four sliding grooves (704) are formed on the side wall of the installation pipe (701). The connecting rods (705) are slidably connected to the sliding grooves (704). A connecting seat (706) is fixedly connected between the four connecting rods (705). The end of the connecting seat (706) is fixedly connected to a rubber plug (707). The end of the installation pipe (701) is provided with a convex inner wall that can abut against the rubber plug (707). Two driving rods (708) are fixedly connected to the side of the driving ring (702) close to the connecting seat (706). The driving rods (708) are slidably connected to the installation pipe (701). The driving rods (708) cooperate with the sealing structure (3); The fixing structure (2) includes a first fixing ring (201) and three driving blocks (202) fixedly connected to the outer wall of the first fixing ring (201). One first fixing ring (201) is fixedly connected to each end of the connecting pipe (1). A second fixing ring (203) is provided on the side of each of the two first fixing rings (201). The sealing structure (3) abuts between the first fixing ring (201) and the second fixing ring (203). The bottom surface of the sealing structure (3) abuts against the outer wall of the conveying pipe (4). Three fixing clips (204) are fixedly connected to the outer wall of the second fixing ring (203). The inner side of the fixing clip (204) abuts against the driving block (202). The side surface of the sealing structure (3) abuts against the driving rod (708).

2. The connecting structure of non-metallic pipe fittings for oil transportation according to claim 1, characterized in that: The cross-section of the connecting seat (706) is in a "T" shape structure, and the cross-section of the rubber plug (707) is in a "convex" shape structure.

3. A non-metallic pipe fitting connection structure for oil transportation according to claim 1, characterized in that: An installation rod (205) is fixedly connected between the two second fixing rings (203). A nut (206) is threadedly connected to the end of the installation rod (205). The nut (206) abuts against one of the second fixing rings (203).

4. A non-metallic pipe fitting connection structure for oil transportation according to claim 3, characterized in that: The driving block (202) has an "L" - shaped structure, and the end of the driving block (202) is provided with an inclined surface, and the fixed clamp (204) is in sliding fit with the inclined surface.

5. A non-metallic pipe fitting connection structure for oil transportation according to claim 1, characterized in that: The sealing structure (3) includes a plurality of rubber blocks (301) and clamping bars (302) fixedly connected to the rubber blocks (301). The plurality of rubber blocks (301) are clamped to each other through the clamping bars (302). The bottom surface of the rubber block (301) is fixedly connected with an iron sheet (303), and the iron sheet (303) abuts against the conveying pipe (4).

6. The connecting structure of non-metallic pipe fittings for oil transportation according to claim 5, characterized in that: The plurality of rubber blocks (301) form an annular structure, and the cross - section of the rubber block (301) is in a trapezoidal structure.

7. A non-metallic pipe fitting connection structure for oil transportation according to claim 1, characterized in that: The mounting structure (6) includes a mounting sleeve (601) and a guide rod (602) fixedly connected to the inner wall of the mounting sleeve (601). The outer wall of the connecting pipe (1) is fixedly connected with the mounting sleeve (601), and the interior of the mounting sleeve (601) is fitted with a filtering structure (5).

8. The connecting structure of non-metallic pipe fittings for oil transportation according to claim 7, characterized in that: The filtering structure (5) includes a fixing ring (501) and a mounting plate (502) slidably connected to the inside of the fixing ring (501). The inner wall of the connecting pipe (1) is fixedly connected with the fixing ring (501). One side of the fixing ring (501) abuts against the mounting pipe (701), and the other side of the fixing ring (501) abuts against another conveying pipe (4). A first filter screen (503) and a second filter screen (505) are respectively clamped on the mounting plate (502). A rubber pad (504) is abutted between the first filter screen (503) and the second filter screen (505). Two limiting bars (506) are slidably connected to the mounting plate (502). A first spring (507) is fixedly connected between the end of the limiting bar (506) and the mounting plate (502), and the limiting bar (506) abuts against the second filter screen (505).

9. A connecting structure for non-metallic pipe fittings used in oil transportation according to claim 8, characterized in that: The mounting plate (502) is slidably connected to the mounting sleeve (601). The end of the mounting plate (502) is slidably connected to the guide rod (602). A second spring (603) is fixedly connected between the end of the mounting plate (502) and the inner wall of the mounting sleeve (601). The end of the mounting sleeve (601) is fixedly connected with a mounting cover (604). A rubber strip (605) is abutted between the inner side of the mounting cover (604) and the mounting plate (502), and the rubber strip (605) is slidably connected to the guide rod (602).

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