CN111609222B - Pipeline structure for water supply and drainage of hospital - Google Patents
Pipeline structure for water supply and drainage of hospital Download PDFInfo
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- CN111609222B CN111609222B CN202010468056.5A CN202010468056A CN111609222B CN 111609222 B CN111609222 B CN 111609222B CN 202010468056 A CN202010468056 A CN 202010468056A CN 111609222 B CN111609222 B CN 111609222B
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- pipe
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- groove
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
- F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/16—Flanged joints characterised by the sealing means
- F16L23/18—Flanged joints characterised by the sealing means the sealing means being rings
- F16L23/22—Flanged joints characterised by the sealing means the sealing means being rings made exclusively of a material other than metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
Abstract
The invention discloses a pipeline structure for water supply and drainage in hospitals, which comprises: a pipe body; a sealing liner fixed on the inner wall of the pipe body; an inner tube mounted inside the sealed liner; a pair of connecting flanges which are respectively integrally formed with the two ends of the inner pipe, and the side walls of the connecting flanges push against the end part of the pipe body; four mounting plates fixed in an annular array on the side wall of the connecting flange close to the pipe body; the four blocking mechanisms are respectively connected with every two corresponding mounting plates of the two connecting flanges and used for pushing against the outer wall of the pipe body; four connecting plates horizontally arranged in an annular array on the circumferential edge of one connecting flange and extending to the circumferential edge of the other connecting flange which belongs to the other adjacent pipe body and is connected with the connecting flange in a sealing way; and the pair of clamping plates are vertically and fixedly connected with two ends of each connecting plate and used for clamping two connecting flanges in sealing connection. Install in the key position, effectively prevent deformation, reduce external factor influence to reduce the maintenance cost.
Description
Technical Field
The invention relates to a pipeline structure, in particular to a pipeline structure for water supply and drainage in hospitals, and belongs to the technical field of pipelines.
Background
The pipeline is one of devices for conveying various objects, and is applied to the pipeline in many places, particularly to water supply and drainage engineering of buildings. At present, in the water supply and drainage engineering of hospitals, most of pipelines are integrated, the same pipeline is used in general positions and key positions, and the pipeline at the key positions is more easily damaged due to the fact that the influence of external influence (temperature, humidity, sunlight, external force impact and the like) or the influence of internal water flow impact pressure on the pipeline at the key positions is larger, and does not have a structure for strengthening protection, and the whole pipeline needs to be replaced during maintenance, so that the maintenance cost is higher. Especially when the internal pressure of pipeline is too big, the phenomenon of deformation appears in the lateral wall of pipeline easily, reduces life to also appear becoming flexible because of the place that too big pipeline of pressure connects, lead to leaking.
Disclosure of Invention
The invention aims to provide a pipeline structure for water supply and drainage in hospitals, which is arranged at a key position, effectively prevents deformation, reduces the influence of external factors and reduces the maintenance cost.
The technical scheme for realizing the purpose is as follows:
a pipe structure for water supply and drainage in hospitals comprises:
a plurality of tubes for forming a pipeline;
the sealing liner is fixed on the inner wall of the pipe body;
the inner pipe is arranged in the sealing lining and is tightly attached to the sealing lining;
a pair of connecting flanges which are respectively integrally formed with the two ends of the inner pipe, and the side walls of the connecting flanges push against the end part of the pipe body;
four mounting plates fixed in an annular array on the connecting flange against the side wall of the pipe body;
the four blocking mechanisms are respectively connected with every two mounting plates corresponding to the two connecting flanges and used for pushing against the outer wall of the pipe body;
four connecting plates horizontally arranged in an annular array on the circumferential edge of one connecting flange and extending to the circumferential edge of the other connecting flange which belongs to the other adjacent pipe body and is connected with the connecting flange in a sealing way; and
and the clamping plates are vertically and fixedly connected with two ends of each connecting plate and used for clamping the two connecting flanges in sealing connection.
According to the technical scheme, through the arrangement of the inner pipe arranged in the pipe body, when the inner pipe is deformed or damaged due to internal pressure, only the inner pipe needs to be replaced, integral replacement is not needed, and the maintenance cost is reduced. Play sealed effect through setting up sealed inside lining, cooperate the body simultaneously, completely cut off or reduce the influence of external factor to the inner tube, improve the life of inner tube. The integrally formed connecting flange and inner tube allow for sealing at the junction of only two flanges. Through setting up the impact that stop mechanism can certain extent stop external force, extrude the pipe body lateral wall simultaneously, prevent to a certain extent because of internal pressure is too big, lead to the deformation to appear in the body. Simultaneously, through the setting of splint, avoid making two flange joint not hard up because of internal pressure, avoid leaking.
Preferably, the inner tube comprises: a first connection pipe and a second connection pipe;
the first connecting pipe and the connecting flange on the left side are integrally formed;
the second connecting pipe and the connecting flange on the right side are integrally formed;
one end of the first connecting pipe, which is close to the second connecting pipe, is provided with an annular spiral groove;
and a spiral ring in threaded connection with the spiral groove is fixedly arranged at one end of the second connecting pipe, which is close to the first connecting pipe.
According to the technical scheme, the structure of the inner pipe is specified, and only the first connecting pipe or the second connecting pipe and the corresponding connecting flange are required to be replaced during general maintenance. Through the design of the spiral groove and the spiral ring, the connection is effectively realized and the sealing is also realized.
Preferably, the inner wall of the pipe orifice of the first connecting pipe or the second connecting pipe is provided with an impact-resistant ring with the caliber gradually reduced along the water flow direction. Thereby reducing the impact of water flow to a certain extent and prolonging the service life of the inner pipe.
Preferably, the blocking mechanism comprises a baffle, a plurality of connecting blocks, extrusion plates in one-to-one correspondence with the connecting blocks and two clamping plates;
the mounting plate is provided with a clamping groove along the vertical direction; a plurality of first screw holes are formed in the clamping groove along the horizontal direction;
the two ends of the baffle are respectively and fixedly connected with the clamping plates vertically;
the clamping plate is clamped in the clamping groove of the mounting plate at the same side;
the clamping plate is provided with a plurality of mounting bolts which are respectively in threaded connection with the corresponding first screw holes in a penetrating manner along the horizontal direction;
the baffle plates are fixedly connected with a plurality of connecting blocks at equal intervals along the horizontal direction on one side of the pipe body;
each connecting block is connected with the corresponding extrusion plate;
the extrusion plate is arc-shaped and pushes against the outer wall of the pipe body.
According to the technical scheme, the structure of the blocking mechanism is embodied, so that the stress on the outer wall of the pipe body is uniform. Through the clamping of the clamping groove and the clamping plate and the design of the bolt and the screw hole, the blocking mechanism is convenient to install.
Preferably, the splint comprises: a fixing plate and a fastening bolt;
four second screw holes are formed in the side wall of the connecting flange in an annular array;
the fixed plate is vertically and fixedly connected with the connecting plate, and a groove is formed in one side surface close to the connecting flange;
one end of the fastening bolt sequentially penetrates through the fixing plate and the groove, and threads are screwed into the corresponding second screw holes.
According to the technical scheme, the clamping plate is effectively connected with the connecting flange. Preventing looseness between the connecting flanges.
Preferably, the splint further comprises: the extrusion block and the compression spring are placed in the groove;
the compression spring is sleeved on the fastening bolt, one end of the compression spring pushes against the bottom end of the groove, and the other end of the compression spring pushes against the extrusion block;
the extrusion block is movably sleeved on the fastening bolt and pushes against the connecting flange.
According to the technical scheme, the flange connection device has a certain deformation threshold value according to the effects of the compression spring and the extrusion block, so that the looseness of the connection part of the two flanges can be better prevented, and water leakage is avoided.
Preferably, the grooves on the upper side and the lower side of the extrusion block are provided with limit grooves in the horizontal direction;
and the upper end and the lower end of the extrusion block are respectively fixed with a limiting block which is in sliding connection with the corresponding limiting groove.
According to the technical scheme, the extrusion block is prevented from falling off during installation, and the installation is convenient.
Preferably, annular rubber pads are fixed on the connecting side walls of the two hermetically connected connecting flanges, and one of the annular rubber pads is provided with a plurality of concentric annular grooves; and a plurality of annular convex blocks which correspond to the annular grooves one by one and are mutually matched are arranged on the other annular rubber pad in a protruding way.
According to the technical scheme, the connection part of the connecting flange is effectively sealed through the matching of the concentric and multi-layer annular grooves and the annular convex blocks.
Preferably, the surface of the impact-resistant ring is provided with a plurality of through holes. The stress of the impact-resistant ring is reduced, and the premature damage of the impact-resistant ring is avoided.
Preferably, the connecting block is sleeved with a spring for connecting the baffle and the extrusion plate. Better preventing external force impact.
Drawings
FIG. 1 is a sectional front view of a pipe structure for water supply and drainage in hospitals according to the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is a structural view of a first connecting pipe in the present invention;
FIG. 4 is a schematic view of a mounting plate of the present invention;
FIG. 5 is a block diagram of a connecting flange according to the present invention;
FIG. 6 is a front view of the structure of the water supply and drainage tube for hospitals according to the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1 to 6, the pipe structure for water supply and drainage in hospitals according to the present invention comprises: a plurality of pipe bodies 1 of the pipeline are formed, and a sealing lining 10, an inner pipe 2, a pair of connecting flanges 3, four pairs of mounting plates 4, four blocking mechanisms 7, four connecting plates 8 and four pairs of clamping plates 9 belong to each pipe body 1.
The sealing liner 10 is fixed to the inner wall of the pipe body 1. The inner pipe 2 is installed inside the sealing liner 10 and is closely attached to the sealing liner 10. Specifically, the inner tube 2 includes a first connection tube 21 and a second connection tube 22.
The first connecting pipe 21 is integrally formed with the left connecting flange 3. The second connecting pipe 22 is integrally formed with the right connecting flange 3. One end of the first connecting pipe 21 close to the second connecting pipe 22 is provided with an annular spiral groove 23; a spiral ring 24 in threaded connection with the spiral groove 23 is fixedly arranged at one end of the second connecting pipe 22 close to the first connecting pipe 21.
Particularly, the inner wall of the pipe orifice of the first connecting pipe 21 or the second connecting pipe 22 is provided with an impact resistant ring with a gradually reduced caliber along the water flow direction, so that the impact force of the water flow entering the pipeline is prevented from being overlarge. The surface of the impact-resistant ring is provided with a plurality of through holes. Avoiding premature failure of the impact ring.
The side wall of the connecting flange 3 pushes against the end of the pipe body 1.
Four mounting plates 4 are secured in an annular array to the side wall of the flange 3 immediately adjacent the tubular body 1.
The four blocking mechanisms 7 are respectively connected with every two mounting plates 4 corresponding to the two connecting flanges 3 and used for pushing against the outer wall of the pipe body 1.
Specifically, the blocking mechanism 7 includes a blocking plate 71, a plurality of connecting blocks 72, pressing plates 73 corresponding to the connecting blocks 72 one by one, and two catching plates 74.
The mounting plate 4 is provided with a clamping groove 5 along the vertical direction; a plurality of first screw holes 6 are arranged in the clamping groove 5 along the horizontal direction. Two ends of the baffle 71 are respectively vertically and fixedly connected with clamping plates 74; the clamping plate 74 is clamped in the clamping groove 5 of the mounting plate 4 at the same side; the catch plate 74 is provided with a plurality of mounting bolts 75 that are screwed into the corresponding first screw holes 6 in the horizontal direction. The baffle 71 is fixedly connected to a plurality of connection blocks 72 at equal intervals in a horizontal direction toward one side of the pipe body 1. Each connecting block 72 is connected with a corresponding extrusion plate 73; the extrusion plate 73 is arc-shaped and pushes against the outer wall of the pipe body 1.
Four connecting plates 8 are horizontally arranged in an annular array on the circumference of one connecting flange 3 and extend to the circumference of the other connecting flange 3 which is subordinate to the other adjacent pipe body 1 and is connected with the connecting flange 3 in a sealing manner.
Each pair of clamping plates 9 is vertically and fixedly connected with two ends of the corresponding connecting plate 8 and is used for clamping two connecting flanges 3 which are in sealing connection. The chucking plate 9 includes: a fixing plate 91, a fastening bolt 96, and a pressing block 92 and a compression spring 93 which are placed in the groove 97.
Four second screw holes 11 are formed in the annular array on the side wall of the connecting flange 3; the fixing plate 91 is vertically and fixedly connected with the connecting plate 8, and a groove 97 is formed on one side surface close to the connecting flange 3; one end of the fastening bolt 96 passes through the fixing plate 91 and the groove 97 in sequence, and is screwed into the corresponding second screw hole 11.
The compression spring 93 is sleeved on the fastening bolt 96, one end of the compression spring pushes against the bottom end of the groove 97, and the other end of the compression spring pushes against the extrusion block 92. The extrusion block 92 is movably sleeved on the fastening bolt 96 and pushes against the connecting flange 3.
The grooves 97 on the upper and lower sides of the extrusion block 92 are provided with horizontal limiting grooves 94. The upper and lower ends of the pressing block 92 are fixed with limit blocks 95 slidably connected in the corresponding limit grooves 94.
Annular rubber pads are fixed on the connecting side walls of the two hermetically connected connecting flanges 3, and one of the annular rubber pads is provided with a plurality of concentric annular grooves 31; the other annular rubber pad is convexly provided with a plurality of annular convex blocks which correspond to the annular grooves 31 one by one and are mutually matched, so that the sealing effect can be effectively realized.
The connecting block 72 is sleeved with a spring for connecting the baffle plate 71 and the extrusion plate 73.
During installation, the first connecting pipe 21 is inserted into one end of the pipe body 1, the second connecting pipe 22 is inserted into the other end of the pipe body 1, the spiral ring 24 arranged on the second connecting pipe 22 is connected inside the spiral groove 23 arranged on the first connecting pipe 21 in a threaded manner, the first connecting pipe 21 and the second connecting pipe 22 are connected together, one baffle plate 71 is taken out, the clamping plates 74 arranged on two sides of the baffle plate 71 are clamped inside the clamping groove 5 of the mounting plate 4 on the same side, the extrusion plate 73 is pressed against the outer wall of the pipe body 1, the mounting bolt 75 inserted on the clamping plate 74 is rotatably inserted into the first screw hole 6 arranged on the inner side wall of the clamping groove 5, the clamping plate 74 is fixed inside the clamping groove 5, the other baffle plates 71 are arranged on the pipe body 1 by repeating the method, the connecting flanges 3 on two sides of the pipe body 1 are connected together, then the other pipe body 1 is assembled, the connecting flanges 3 belonging to the two pipe bodies 1 are pressed together, then one of the connecting plates 8 is clamped on the two connecting flanges 3 which are connected with each other, the two clamping plates 9 arranged on the connecting plate 8 are respectively clamped on the side surfaces of the two connecting flanges 3, the fixing plate 91 of the clamping plate 9 is abutted against the mounting plate 4 and the clamping plate 74 on the same side, in the process, the extrusion block 92 is extruded into the groove 97, under the elastic action of the compression spring 93, the extrusion block 92 is abutted against the connecting flanges 3, then the fastening bolt 96 inserted on the fixing plate 91 is rotated, so that the fastening bolt 96 penetrates through the compression spring 93 and the extrusion block 92 on the same side and is in threaded connection with the second screw hole 11 corresponding to the extrusion block 92 on the same side, and then the mode is repeated to mount the other connecting plates 8 with the clamping plates 9 on the two connecting flanges 3 of the invention, and further clamp the two connecting flanges 3 on the same side together.
In conclusion, when the inner pipe is deformed or damaged due to the internal pressure, only the inner pipe 2 needs to be replaced, only the first connecting pipe 21 or the second connecting pipe 22 needs to be replaced, the whole replacement is not needed, and the maintenance cost is reduced. The sealing liner 10 is matched with the pipe body 1 to isolate or reduce the influence of external factors on the inner pipe and prolong the service life of the inner pipe 2. Through setting up the impact that the stop gear 7 can certain extent block external force, extrude body 1 lateral wall simultaneously, prevent to a certain extent because of internal pressure is too big, lead to deformation to appear in body 1. Meanwhile, through the arrangement of the clamping plate 9, the phenomenon that the joint of the two connecting flanges 3 is loosened due to internal pressure is avoided, and water leakage is avoided.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (4)
1. A pipeline structure for water supply and drainage in hospitals is characterized by comprising:
a plurality of tubular bodies (1) for forming a pipeline;
a sealing lining (10) fixed on the inner wall of the pipe body (1);
the inner pipe (2) is arranged inside the sealing liner (10) and is tightly attached to the sealing liner (10);
a pair of connecting flanges (3) which are respectively integrally formed with two ends of the inner pipe (2) and of which one side wall pushes against the end part of the pipe body (1);
four mounting plates (4) fixed in an annular array on the side wall of the connecting flange (3) abutting against the pipe body (1);
the four blocking mechanisms (7) are respectively connected with every two mounting plates (4) corresponding to the two connecting flanges (3) and used for pushing against the outer wall of the pipe body (1);
four connecting plates (8) are horizontally arranged on the circumference of one connecting flange (3) in an annular array and extend to the circumference of the other connecting flange (3) which belongs to the other adjacent pipe body (1) and is connected with the connecting flange (3) in a sealing way; and
a pair of clamping plates (9) which are vertically and fixedly connected with two ends of each connecting plate (8) and used for clamping the two connecting flanges (3) which are connected in a sealing manner;
the inner tube (2) comprises: a first connection pipe (21) and a second connection pipe (22);
the first connecting pipe (21) and the connecting flange (3) on the left side are integrally formed;
the second connecting pipe (22) and the connecting flange (3) on the right side are integrally formed;
one end of the first connecting pipe (21) close to the second connecting pipe (22) is provided with an annular spiral groove (23);
a spiral ring (24) in threaded connection with the spiral groove (23) is fixedly arranged at one end, close to the first connecting pipe (21), of the second connecting pipe (22);
the inner wall of the pipe orifice of the first connecting pipe (21) or the second connecting pipe (22) is provided with an impact resistant ring with the caliber gradually reduced along the water flow direction;
the blocking mechanism (7) comprises a baffle (71), a plurality of connecting blocks (72), extrusion plates (73) which correspond to the connecting blocks (72) one by one, and two clamping plates (74);
the mounting plate (4) is provided with a clamping groove (5) along the vertical direction; a plurality of first screw holes (6) are formed in the clamping groove (5) along the horizontal direction;
the two ends of the baffle (71) are respectively and vertically and fixedly connected with the clamping plates (74);
the clamping plate (74) is clamped in the clamping groove (5) of the mounting plate (4) at the same side;
the clamping plate (74) is provided with a plurality of mounting bolts (75) which are respectively in threaded connection with the corresponding first screw holes (6) in a penetrating manner along the horizontal direction;
the baffle (71) faces one side of the pipe body (1) and is fixedly connected with a plurality of connecting blocks (72) at equal intervals along the horizontal direction;
each connecting block (72) is connected with the corresponding extrusion plate (73);
the extrusion plate (73) is arc-shaped and pushes against the outer wall of the pipe body (1);
the splint (9) comprises: a fixing plate (91) and a fastening bolt (96);
four second screw holes (11) are formed in the side wall of the connecting flange (3) in an annular array;
the fixing plate (91) is vertically and fixedly connected with the connecting plate (8), and a groove (97) is formed in one side surface close to the connecting flange (3);
one end of the fastening bolt (96) sequentially penetrates through the fixing plate (91) and the groove (97) and is screwed into the corresponding second screw hole (11);
the splint (9) further comprises: the extrusion block (92) and the compression spring (93) are placed in the groove (97);
the compression spring (93) is sleeved on the fastening bolt (96), one end of the compression spring pushes against the bottom end of the groove (97), and the other end of the compression spring pushes against the extrusion block (92);
the extrusion block (92) is movably sleeved on the fastening bolt (96) and pushes against the connecting flange (3);
the grooves (97) on the upper side and the lower side of the extrusion block (92) are internally provided with limit grooves (94) in the horizontal direction;
and the upper end and the lower end of the extrusion block (92) are respectively fixed with a limiting block (95) which is connected in a sliding way in the corresponding limiting groove (94).
2. The water supply and drainage pipeline structure for the hospital according to claim 1, wherein the connecting side walls of the two hermetically connected connecting flanges (3) are respectively fixed with an annular rubber gasket, one of the annular rubber gaskets is provided with a plurality of concentric annular grooves (31); the other annular rubber pad is convexly provided with a plurality of annular convex blocks which are in one-to-one correspondence with the annular grooves (31) and are mutually matched.
3. The hospital water supply and drainage pipeline structure according to claim 1, wherein the impact resistant ring is provided with a plurality of through holes on the surface.
4. The water supply and drainage pipeline structure for hospital according to claim 1, characterized in that the connecting block (72) is sleeved with a spring connecting the baffle plate (71) and the pressing plate (73).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010468056.5A CN111609222B (en) | 2020-05-28 | 2020-05-28 | Pipeline structure for water supply and drainage of hospital |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010468056.5A CN111609222B (en) | 2020-05-28 | 2020-05-28 | Pipeline structure for water supply and drainage of hospital |
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| Publication Number | Publication Date |
|---|---|
| CN111609222A CN111609222A (en) | 2020-09-01 |
| CN111609222B true CN111609222B (en) | 2021-12-21 |
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| CN202010468056.5A Active CN111609222B (en) | 2020-05-28 | 2020-05-28 | Pipeline structure for water supply and drainage of hospital |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114440028B (en) * | 2021-12-28 | 2023-12-22 | 安庆市盛唐制冷设备有限责任公司 | Connecting pipeline with high cold air transmission efficiency |
| CN115199827B (en) * | 2022-07-25 | 2023-06-27 | 贵州恒通源管业有限公司 | PE double-wall corrugated pipe for municipal sewage disposal |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN111609222A (en) | 2020-09-01 |
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