CN212868830U - Coal bed gas utilizes pipe connection device - Google Patents

Coal bed gas utilizes pipe connection device Download PDF

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Publication number
CN212868830U
CN212868830U CN202021946189.0U CN202021946189U CN212868830U CN 212868830 U CN212868830 U CN 212868830U CN 202021946189 U CN202021946189 U CN 202021946189U CN 212868830 U CN212868830 U CN 212868830U
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China
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wall
ring
circular
positioning
coal bed
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CN202021946189.0U
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Chinese (zh)
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尹中山
戚明辉
张烨毓
王东强
刘虎
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Sichuan Keyuan Engineering Technology Test Center Co ltd
Yin Zhongshan
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KEYUAN ENGINEERING TECHNICAL TEST CENTER OF SICHUAN PROVINCE
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Abstract

The utility model discloses a coal bed gas utilizes pipe connection device, including two gas pipeline, the right-hand member that is located left gas pipeline in two gas pipeline communicates and is fixed with the collar, and the left end fixed mounting that is located the gas pipeline on right side has the circular install bin that the left side set up for the opening, has seted up the air vent on the right side inner wall of circular install bin, and the air vent is linked together with the gas pipeline on right side, and the right side of collar is inlayed and is equipped with the elastic seal circle, and the right side of elastic seal circle extends to in the circular install bin. The utility model relates to a rationally, be convenient for quick with two gas pipeline sealing fixed connection, and the setting of a plurality of trapezoidal draw-in grooves, be convenient for adjust the leakproofness of elasticity sealing washer according to actual need, cooperate a plurality of first springs to the extrusion force of elasticity sealing washer simultaneously, can improve its seal stability, reduce because of long-time the use, cause the unsatisfactory phenomenon of sealed effect, be favorable to the use.

Description

Coal bed gas utilizes pipe connection device
Technical Field
The utility model relates to a pipe connection equipment technical field especially relates to a coal bed gas utilizes pipe connection device.
Background
The coal bed gas is a clean, high-quality energy with high thermal efficiency and low pollution, and can be used as a civil and industrial fuel, an automobile fuel or for power generation; the method can also be used for producing carbon black, formaldehyde, chemical fertilizers and other chemical products, the domestic coal bed gas utilization is mainly divided into ways of pipeline gas, Compressed Natural Gas (CNG), Liquefied Natural Gas (LNG), low-concentration gas, ventilation air methane and the like, and a connecting pipeline is needed to convey the coal bed gas in the coal bed gas utilization; the existing coal bed gas utilization pipeline is mostly formed by connecting a plurality of short pipelines, a connecting device between two adjacent pipelines is mostly installed through matching of flanges and bolts, the installation efficiency is low, the sealing effect after installation is not ideal, the use requirement cannot be met, and therefore the coal bed gas utilization pipeline connecting device is provided for solving the problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing a coal bed gas pipeline connecting device.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a pipeline connecting device for coal bed gas utilization comprises two gas pipelines, wherein the right end of the gas pipeline on the left side of the two gas pipelines is communicated and fixed with a mounting ring, the left end of the gas pipeline on the right side is fixedly provided with a circular mounting box with an opening on the left side, the right inner wall of the circular mounting box is provided with an air vent, the air vent is communicated with the gas pipeline on the right side, the right side of the mounting ring is embedded with an elastic sealing ring, the right side of the elastic sealing ring extends into the circular mounting box, the circular mounting box is movably sleeved on the elastic sealing ring in a sealing way, the right side of the elastic sealing ring is movably contacted with a squeezing ring, a plurality of first springs are fixedly arranged between the right side of the squeezing ring and the right inner wall of the circular mounting box, a plurality of positioning sleeves are embedded on the right inner wall of the circular mounting box, a plurality of first positioning rods are fixedly arranged on the, a second positioning rod is fixedly installed at the top of the left side of the circular installation box, a third positioning rod is fixedly installed at the bottom of the left side of the circular installation box, an installation ring is movably sleeved on the second positioning rod and the third positioning rod, the left end of the second positioning rod is arranged to be an inclined plane, a first groove with an opening at the left side is formed at the top of the second positioning rod, a plurality of trapezoidal clamping grooves are formed in the inner wall of the bottom of the first groove, the right side of each trapezoidal clamping groove is arranged to be an inclined plane, a cavity is formed in the installation ring, two L-shaped positioning rods are fixedly installed on the inner wall of the top of the cavity, a T-shaped clamping rod is slidably sleeved on the two L-shaped positioning rods, the bottom end of the T-shaped clamping rod extends into one of the trapezoidal clamping grooves and is embedded with a ball, the T-shaped clamping rod is clamped with one of the trapezoidal clamping grooves, the ball is matched with the inclined plane on the trapezoidal clamping grooves, a, the top of the T-shaped clamping rod is fixedly provided with a T-shaped pull rod, the top of the T-shaped pull rod extends to the upper part of the mounting ring, and the mounting ring is sleeved on the T-shaped pull rod in a sliding manner.
Preferably, the top of the right side of the mounting ring is provided with a first rectangular hole communicated with the cavity, the inner wall of the first rectangular hole is in movable contact with the outer side of the second positioning rod, the bottom of the right side of the mounting ring is provided with a second rectangular hole, and the inner wall of the second rectangular hole is in movable contact with the outer side of the third positioning rod.
Preferably, two third rectangular holes are formed in the inner wall of the top of the T-shaped clamping rod, and the inner walls of the third rectangular holes are in sliding connection with the outer sides of the corresponding L-shaped positioning rods.
Preferably, a fourth rectangular hole is formed in the inner wall of the top of the cavity, and the inner wall of the fourth rectangular hole is in sliding connection with the outer side of the T-shaped pull rod.
Preferably, the limiting groove is formed in one side, away from each other, of each of the two positioning sleeves, the limiting block is fixedly mounted on one side, away from each other, of each of the two first positioning rods, and the limiting block is connected with the corresponding limiting groove in a sliding mode.
Preferably, the outer side of the elastic sealing ring is movably contacted with the inner wall of the circular mounting box.
Preferably, the side wall of the mounting ring is provided with an annular groove with an opening at the right side, and the inner wall of the annular groove is fixedly bonded with the outer side of the elastic sealing ring.
Compared with the prior art, the beneficial effects of the utility model are that:
through the matching of the gas pipeline, the circular installation box, the installation ring, the elastic sealing ring, the vent hole, the extrusion ring, the first spring, the positioning sleeve, the first positioning rod, the second positioning rod, the trapezoidal clamping groove, the first groove, the cavity, the L-shaped positioning rod, the T-shaped clamping rod and the second spring with the third positioning rod, when the two gas pipelines need to be separated, the T-shaped pull rod is pulled upwards to drive the T-shaped rod to move upwards on the two L-shaped positioning rods from one trapezoidal clamping groove clamped with the T-shaped positioning rod and compress the second spring, then the gas pipeline on the right side is pulled in the direction far away from the installation ring to drive the third positioning rod and the second positioning rod to move respectively from the second rectangular hole and the first rectangular hole, the gas pipeline on the right side drives the circular installation box to move rightwards, so that the elastic sealing ring is gradually moved out from the circular installation box, and the separation, when two gas pipelines need to be connected in a sealing way, a first rectangular hole and a second rectangular hole are respectively aligned with a second locating rod and a third locating rod, the gas pipeline on the right side is pushed leftwards to drive the second locating rod and the third locating rod to respectively move into the first rectangular hole and the second rectangular hole, the inclined plane of the second locating rod gradually extrudes balls while moving, the extrusion force drives a T-shaped clamping rod to slide upwards on an L-shaped locating rod through the balls and compress a second spring, meanwhile, the gas pipeline on the right side drives a circular installation box to move leftwards, so that an elastic sealing ring gradually moves into the circular installation box, the circular installation box drives an extrusion ring to gradually move to be in close contact with the left side of the elastic sealing ring through a first spring, the extrusion ring is limited to continue moving, the circular installation box continues to move and compresses the first spring, when the first spring is completely compressed, circular install bin continues to remove and drives the extrusion ring and compress elastic seal circle left, when adjusting elastic seal circle's compression degree according to actual need, two gas line are in the sealing connection state, promote the gas line on right side a little, make T shape kelly align with a trapezoidal draw-in groove in a plurality of trapezoidal draw-in grooves, the elasticity of second spring drives T shape kelly downstream to the trapezoidal draw-in groove of alignment this moment in, and then make two gas line be in sealed fixed connection state, under the cooperation of a plurality of trapezoidal draw-in grooves, make can actual need adjust elastic seal circle's elasticity size, and the extrusion force of the elasticity of a plurality of first springs to elastic seal circle, can improve its sealing stability.
The utility model relates to a rationally, be convenient for quick with two gas pipeline sealing fixed connection, and the setting of a plurality of trapezoidal draw-in grooves, be convenient for adjust the leakproofness of elasticity sealing washer according to actual need, cooperate a plurality of first springs to the extrusion force of elasticity sealing washer simultaneously, can improve its seal stability, reduce because of long-time the use, cause the unsatisfactory phenomenon of sealed effect, be favorable to the use.
Drawings
Fig. 1 is a schematic cross-sectional structural view of a coal bed methane pipeline connecting device according to the present invention;
fig. 2 is an enlarged schematic view of a portion a in fig. 1.
In the figure: 1 gas pipeline, 2 circular install bin, 3 collar, 4 elastic seal circle, 5 air vents, 6 extrusion rings, 7 first spring, 8 locating sleeve, 9 first locating levers, 10 second locating levers, 11 trapezoidal draw-in grooves, 12 first grooves, 13 cavities, 14L shape locating levers, 15T shape kelly, 16 second springs, 17 third locating levers.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to fig. 1-2, a coal bed gas utilization pipeline connecting device comprises two gas pipelines 1, wherein the right end of the gas pipeline 1 positioned on the left side of the two gas pipelines 1 is communicated and fixed with a mounting ring 3, the left end of the gas pipeline 1 positioned on the right side is fixedly provided with a circular mounting box 2 with an opening arranged on the left side, the inner wall of the right side of the circular mounting box 2 is provided with a vent hole 5, the vent hole 5 is communicated with the gas pipeline 1 on the right side, the right side of the mounting ring 3 is embedded with an elastic sealing ring 4, the right side of the elastic sealing ring 4 extends into the circular mounting box 2, the circular mounting box 2 is movably sleeved on the elastic sealing ring 4 in a sealing manner, the right side of the elastic sealing ring 4 is movably contacted with an extrusion ring 6, a plurality of first springs 7 are fixedly arranged between the right side of the extrusion ring 6 and the inner wall of the right side of the circular, a plurality of first positioning rods 9 are fixedly arranged on the right side of the extrusion ring 6, positioning sleeves 8 are slidably sleeved on the corresponding first positioning rods 9, a second positioning rod 10 is fixedly arranged at the top of the left side of the circular installation box 2, a third positioning rod 17 is fixedly arranged at the bottom of the left side of the circular installation box 2, the installation ring 3 is movably sleeved on the second positioning rod 10 and the third positioning rod 17, the left end of the second positioning rod 10 is arranged into an inclined plane, a first groove 12 with an opening at the left side is arranged at the top of the second positioning rod 10, a plurality of trapezoidal clamping grooves 11 are arranged on the inner wall of the bottom of the first groove 12, the right side of each trapezoidal clamping groove 11 is arranged into an inclined plane, a cavity 13 is arranged on the installation ring 3, two L-shaped positioning rods 14 are fixedly arranged on the inner wall of the top of the cavity 13, T-shaped clamping rods 15 are slidably sleeved on the two L-shaped positioning rods 14, the bottom ends of the T-shaped, the utility model relates to a rationally, be convenient for quick with two gas pipeline 1 sealed fixed connection, and the setting of a plurality of trapezoidal draw-in grooves 11, be convenient for adjust the leakproofness of elasticity sealing washer 4 according to actual need, cooperate a plurality of first springs to the extrusion force of elasticity sealing washer 4 simultaneously, can improve its seal stability, reduce because of long-time the use, cause the unsatisfactory phenomenon of sealed effect, be favorable to using with trapezoidal draw-in groove 11 in the trapezoidal draw-in groove 11 of a trapezoidal draw-in groove 11 of the trapezoidal draw-in groove 11 of reducing of the not ideal phenomenon of sealed effect, be favorable to using of the trapezoidal draw-in groove 11 of T shape kelly 15, inclined plane looks adaptation on ball and the trapezoidal draw-in groove 11, fixed mounting has a plurality of second springs 16 between the top of T shape kelly 15 and the top of cavity 13, and the top of collar 3 is extended to.
In the utility model, the right top of the mounting ring 3 is provided with a first rectangular hole communicated with the cavity 13, the inner wall of the first rectangular hole is movably contacted with the outer side of the second positioning rod 10, the right bottom of the mounting ring 3 is provided with a second rectangular hole, the inner wall of the second rectangular hole is movably contacted with the outer side of the third positioning rod 17, the inner wall of the top of the T-shaped clamping rod 15 is provided with two third rectangular holes, the inner wall of the third rectangular hole is slidably connected with the outer side of the corresponding L-shaped positioning rod 14, the inner wall of the top of the cavity 13 is provided with a fourth rectangular hole, the inner wall of the fourth rectangular hole is slidably connected with the outer side of the T-shaped pull rod, one side of the two positioning sleeves 8 which are far away from each other is provided with a limiting groove, one side of the two first positioning rods 9 which are far away from each other is fixedly provided with a limiting block, the limiting block is slidably connected with the corresponding limiting groove, set up the ring channel that the right side set up for the opening on the lateral wall of collar 3, the inner wall of ring channel bonds fixedly with the outside of elastic sealing ring 4, the utility model relates to a rationally, be convenient for quick 1 sealed fixed connection with two gas pipeline, and a plurality of trapezoidal draw-in grooves 11's setting, be convenient for adjust the leakproofness of elastic sealing ring 4 according to actual need, cooperate a plurality of first springs to the extrusion force of elastic sealing ring 4 simultaneously, can improve its seal stability, reduce because of long-time the use, cause the unsatisfactory phenomenon of sealed effect, be favorable to using.
The working principle is as follows: when the gas pipeline separation device is used, when two gas pipelines 1 need to be separated, the T-shaped pull rod is pulled upwards, the T-shaped pull rod drives the T-shaped rod 15 to slide upwards on the two L-shaped positioning rods 14 and compress the second spring 16, the T-shaped rod 15 moves upwards and gradually moves out of one trapezoidal clamping groove 11 clamped with the T-shaped rod, fixing of the second positioning rod 10 is removed, the gas pipeline 1 on the right side is pulled towards the direction far away from the mounting ring 3, the gas pipeline 1 on the right side drives the third positioning rod 17 and the second positioning rod 10 to respectively move out of the second rectangular hole and the first rectangular hole, the gas pipeline 1 on the right side drives the circular mounting box 2 to move rightwards, the elastic sealing ring 4 is gradually moved out of the circular mounting box 2, and separation of the two gas pipelines 1 is completed;
when two gas pipelines 1 need to be connected in a sealing way, a first rectangular hole and a second rectangular hole are respectively aligned with a second locating rod 10 and a third locating rod 17, the gas pipeline 1 on the right side is pushed leftwards, the gas pipeline 1 on the right side drives the second locating rod 10 and the third locating rod 17 to respectively move into the first rectangular hole and the second rectangular hole, when the second locating rod 10 moves until the inclined plane of the second locating rod contacts with the ball, the second locating rod 10 continues to move and extrudes the ball, the extrusion force drives the ball to move upwards, the ball drives a T-shaped clamping rod 15 to slide upwards on an L-shaped locating rod 14 and compress a second spring 16, the gas pipeline 1 on the right side drives a circular installation box 2 to move leftwards while moving, so that an elastic sealing ring 4 gradually moves into the circular installation box 2, and simultaneously, the circular installation box 2 drives an extrusion ring 6 to gradually move to be in close contact with the left side of the elastic sealing ring 4 through a first spring 7, the extrusion ring 6 is limited to move continuously, the circular installation box 2 moves continuously and compresses the first spring 7, meanwhile, the circular installation box 2 drives the plurality of positioning sleeves 8 to slide on the corresponding first positioning rods 9 respectively, when the first spring 7 is completely compressed, the circular installation box 2 moves continuously and drives the extrusion ring 6 to compress the elastic sealing ring 4 leftwards, when the compression degree of the elastic sealing ring 4 is adjusted according to actual needs, the two gas pipelines 1 are in a sealing connection state, the gas pipeline 1 on the right side is slightly pushed, the T-shaped clamping rod 15 is aligned with one trapezoidal clamping groove 11 in the plurality of trapezoidal clamping grooves 11, the second spring 16 in the compression state resets, the elastic force of the second spring 16 drives the T-shaped clamping rod 15 to move downwards into the aligned trapezoidal clamping groove 11, and the T-shaped clamping rod 15 is clamped with the aligned trapezoidal clamping groove 11, so that the circular installation box 2 is fixed, and the two gas pipelines 1 are in a sealed and fixed connection state;
when the phenomenon that the elastic sealing ring 4 is aged and becomes loose after being used for a long time, the sealing performance of the elastic sealing ring 4 needs to be adjusted, the right gas pipeline 1 is continuously pushed leftwards to drive the circular installation box 2 to move, the extrusion ring 6 is continuously moved leftwards and compresses the elastic sealing ring 4, the right gas pipeline 1 is stopped to be pushed when the compression degree of the elastic sealing ring 4 is adjusted according to actual needs, under the cooperation of the trapezoid clamping grooves 11, the elastic force of the elastic sealing ring 4 can be adjusted according to actual needs, meanwhile, the extrusion force of the elastic sealing ring 4 by the elasticity of the first springs 7 is matched, the sealing stability of the elastic sealing ring can be improved, and the phenomenon that the sealing effect is not ideal due to long-time use is reduced.
In the description of the present application, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, a connection through an intermediate medium, and a connection between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to specific circumstances.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (7)

1. A pipeline connecting device for coal bed gas utilization comprises two gas pipelines (1), and is characterized in that the right ends of the gas pipelines (1) on the left side in the two gas pipelines (1) are communicated and fixed with a mounting ring (3), the left end of the gas pipeline (1) on the right side is fixedly provided with a circular mounting box (2) with the left side arranged as an opening, the inner wall of the right side of the circular mounting box (2) is provided with a vent hole (5), the vent hole (5) is communicated with the gas pipeline (1) on the right side, the right side of the mounting ring (3) is embedded with an elastic sealing ring (4), the right side of the elastic sealing ring (4) extends into the circular mounting box (2), the circular mounting box (2) is sleeved with the elastic sealing ring (4) in a sealing and movable manner, the right side of the elastic sealing ring (4) is in movable contact with a squeezing ring (6), a plurality of first springs (7) are fixedly arranged between the right side of the squeezing ring (6, a plurality of positioning sleeves (8) are embedded on the inner wall of the right side of the circular installation box (2), a plurality of first positioning rods (9) are fixedly installed on the right side of the extrusion ring (6), the positioning sleeves (8) are slidably sleeved on the corresponding first positioning rods (9), a second positioning rod (10) is fixedly installed at the top of the left side of the circular installation box (2), a third positioning rod (17) is fixedly installed at the bottom of the left side of the circular installation box (2), the installation ring (3) is movably sleeved on the second positioning rods (10) and the third positioning rods (17), the left end of the second positioning rod (10) is arranged to be an inclined plane, a first groove (12) with the left side arranged as an opening is formed in the top of the second positioning rod (10), a plurality of trapezoidal clamping grooves (11) are formed in the inner wall of the bottom of the first groove (12), the right side of the trapezoidal clamping grooves (11) is arranged to be an inclined plane, fixed mounting has two L shape locating levers (14) on the top inner wall of cavity (13), sliding sleeve is equipped with T shape kelly (15) on two L shape locating levers (14), the bottom of T shape kelly (15) extends to in trapezoidal draw-in groove (11) in a plurality of trapezoidal draw-in grooves (11) and inlays and be equipped with the ball, one trapezoidal draw-in groove (11) in T shape kelly (15) and a plurality of trapezoidal draw-in grooves (11) clamp mutually, inclined plane looks adaptation on ball and the trapezoidal draw-in groove (11), fixed mounting has a plurality of second springs (16) between the top of T shape kelly (15) and the top inner wall of cavity (13), the top fixed mounting of T shape kelly (15) has T shape pull rod, the top of T shape pull rod extends to the top of collar (3), collar (3) slip cover is established on T shape pull rod.
2. The connecting device for the coal bed methane utilization pipeline according to claim 1, wherein a first rectangular hole communicated with the cavity (13) is formed in the top of the right side of the mounting ring (3), the inner wall of the first rectangular hole is in movable contact with the outer side of the second positioning rod (10), a second rectangular hole is formed in the bottom of the right side of the mounting ring (3), and the inner wall of the second rectangular hole is in movable contact with the outer side of the third positioning rod (17).
3. The connecting device for the coal bed methane utilization pipeline is characterized in that two third rectangular holes are formed in the inner wall of the top of the T-shaped clamping rod (15), and the inner walls of the third rectangular holes are in sliding connection with the outer sides of the corresponding L-shaped positioning rods (14).
4. The connecting device for the coal bed methane utilization pipeline is characterized in that a fourth rectangular hole is formed in the inner wall of the top of the cavity (13), and the inner wall of the fourth rectangular hole is connected with the outer side of the T-shaped pull rod in a sliding mode.
5. The device for connecting a coal bed methane utilization pipeline according to claim 1, characterized in that one side of each of the two positioning sleeves (8) away from each other is provided with a limiting groove, one side of each of the two first positioning rods (9) away from each other is fixedly provided with a limiting block, and the limiting blocks are slidably connected with the corresponding limiting grooves.
6. The coal bed methane pipeline connecting device according to claim 1, wherein the outer side of the elastic sealing ring (4) is movably contacted with the inner wall of the circular mounting box (2).
7. The connecting device for the coal bed methane utilization pipeline is characterized in that an annular groove with an opening at the right side is formed in the side wall of the mounting ring (3), and the inner wall of the annular groove is fixedly bonded with the outer side of the elastic sealing ring (4).
CN202021946189.0U 2020-09-08 2020-09-08 Coal bed gas utilizes pipe connection device Active CN212868830U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021946189.0U CN212868830U (en) 2020-09-08 2020-09-08 Coal bed gas utilizes pipe connection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021946189.0U CN212868830U (en) 2020-09-08 2020-09-08 Coal bed gas utilizes pipe connection device

Publications (1)

Publication Number Publication Date
CN212868830U true CN212868830U (en) 2021-04-02

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Application Number Title Priority Date Filing Date
CN202021946189.0U Active CN212868830U (en) 2020-09-08 2020-09-08 Coal bed gas utilizes pipe connection device

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CN (1) CN212868830U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115978349A (en) * 2022-12-27 2023-04-18 鄂尔多斯市腾远煤炭有限责任公司 Water pump butt joint structure of coal mine drainage system and use method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115978349A (en) * 2022-12-27 2023-04-18 鄂尔多斯市腾远煤炭有限责任公司 Water pump butt joint structure of coal mine drainage system and use method thereof

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Address after: No. 9, Unit 1, Building 6, No. 50 Caotang North Branch Road, Qingyang District, Chengdu City, Sichuan Province, 610000

Patentee after: Yin Zhongshan

Patentee after: Sichuan Keyuan Engineering Technology Test Center Co.,Ltd.

Address before: No.22h, Jingye District, Qingyang District, Chengdu, Sichuan 610099

Patentee before: Yin Zhongshan

Patentee before: KEYUAN ENGINEERING TECHNICAL TEST CENTER OF SICHUAN PROVINCE