CN111963808A - Large-diameter straight pipe pressure balance type expansion joint balanced by external pressure corrugated pipe - Google Patents
Large-diameter straight pipe pressure balance type expansion joint balanced by external pressure corrugated pipe Download PDFInfo
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- CN111963808A CN111963808A CN202010773021.2A CN202010773021A CN111963808A CN 111963808 A CN111963808 A CN 111963808A CN 202010773021 A CN202010773021 A CN 202010773021A CN 111963808 A CN111963808 A CN 111963808A
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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
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
- F16L51/03—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube comprising two or more bellows
- F16L51/035—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube comprising two or more bellows for cancelling the axial loading resulting from fluid pressure
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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
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
- F16L51/025—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube with several corrugations
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
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Abstract
The large-diameter straight pipe pressure balance type expansion joint balanced by external pressure corrugated pipes is provided with working corrugated pipes, two sides of each working corrugated pipe are respectively connected with an end pipe, and a plurality of groups of pull rod assemblies and a plurality of groups of external corrugated pipe balance assemblies are arranged on the outer sides of the end pipes on the two sides along the circumferential direction; the peripheral corrugated pipe balance assembly comprises a guide plate, an end ring, an external pressure balance body and a pressure connection pipe, wherein the guide plate and the end ring are sleeved on the end pipe on the same side, two ends of the external pressure balance body are fixedly connected with the guide plate and the end pipe respectively, the external pressure balance body is provided with an external balance cavity surrounded by a peripheral corrugated pipe and a connecting piece, the outer side of the peripheral corrugated pipe is located in the external balance cavity, and the external balance cavity is communicated with the end pipe on the same side through the pressure connection pipe. The plurality of groups of pull rod assemblies are uniformly distributed on the circumference of each end pipe, so that the manufacturing difficulty of the expansion joint can be greatly reduced, and the product cost is reduced.
Description
Technical Field
The invention belongs to the field of pipeline flexibility compensation, and particularly relates to a large-diameter straight pipe pressure balance type expansion joint balanced by an external pressure corrugated pipe.
Background
The straight pipe pressure balance type expansion joint can be used for compensating axial displacement of a pipeline, a structural member is adopted to restrain blind plate force of the pipeline, no blind plate force is output to a pipe opening and a support, and the whole structure is shown in figure 1. The straight pipe pressure balance type expansion joint applied to a conventional pipeline (the diameter is less than 4 meters) generally comprises two groups of working corrugated pipes, a group of balance corrugated pipes and other stressed structural members, the diameter of a balance wave is 1.414 times of that of the working wave, a plurality of groups of pull rods realize the transmission of the balance force, one end of each pull rod is respectively connected with an end pipe assembly, and the other end of each pull rod is connected with a middle pipe assembly.
For the expansion joint compensation application with larger pipe diameter, the design and the manufacture of the straight pipe pressure balance type expansion joint have difficulty. On the one hand, the huge blind plate force of the pipeline brings challenges to the design of the structural member, and on the other hand, the diameter of the required balance corrugated pipe is further increased, and the manufacturing difficulty of the balance corrugated pipe is greatly increased. For a 13 meter diameter pipeline, the balance corrugated pipe diameter will reach 18.4 meters and the blind force will reach 5315T, as calculated by the pipeline pressure of 0.2 MPa.
Disclosure of Invention
In order to solve the technical problems, the invention provides the large-diameter straight pipe pressure balance type expansion joint balanced by the externally-arranged external pressure corrugated pipe, which can greatly reduce the manufacturing difficulty of the expansion joint and simultaneously reduce the product cost.
In order to realize the technical purpose, the adopted technical scheme is as follows: the large-diameter straight pipe pressure balance type expansion joint balanced by external pressure corrugated pipes is provided with working corrugated pipes, two sides of each working corrugated pipe are respectively connected with an end pipe, and a plurality of groups of pull rod assemblies and a plurality of groups of external corrugated pipe balance assemblies are arranged on the outer sides of the end pipes on the two sides along the circumferential direction;
the outer bellows balance assembly comprises a guide plate, an end ring, an outer pressing balance body and a pressure connection pipe, the guide plate and the end ring are sleeved on the end pipe on the same side, a sliding gap is arranged between the guide plate and the end pipe, the end ring is fixedly connected with the end pipe, two ends of the outer pressing balance body are fixedly connected with the guide plate and the end pipe respectively, the outer pressing balance body comprises an outer bellows located on the outer side of the end pipe, the outer pressing balance body is provided with an outer balance cavity surrounded by the outer bellows and a connecting piece, the outer side of the outer bellows is located in the outer balance cavity, and the outer balance cavity is communicated with the end pipe on the same side through the pressure connection pipe.
And a plurality of groups of pull rod assemblies are uniformly distributed on the circumference of each end pipe, one end of each pull rod assembly is fixedly connected with the guide plate on one end pipe, and the other end of each pull rod assembly is fixedly connected with the end ring on the other end pipe.
The outer balance body that flattens comprises a biography power section of thick bamboo, the connecting plate, the peripheral hardware bellows, fixed plate and urceolus, be connected with the one end of a biography power section of thick bamboo that sets up with expansion joint axial unanimity on the deflector, the other end and the connecting plate of a biography power section of thick bamboo are connected, the connecting plate is connected with the fixed plate through the peripheral hardware bellows of cover in a biography power section of thick bamboo outside, the fixed plate cover is established in the outside of a biography power section of thick bamboo and is equipped with the sliding gap between the power section of thick bamboo, the outer border and the urceolus one end of cover in the peripheral hardware bellows outside of fixed plate are connected, the other end of urceolus is connected on.
The multiple groups of external corrugated pipe balance assemblies are symmetrically arranged on two sides of the working corrugated pipe.
The pull rod assemblies are arranged on two sides of each group of peripheral corrugated pipe balance assemblies.
The middle part in the external pressure balancing body is provided with an optimized balancing body, the optimized balancing body is an optimized balancing cavity formed by an optimized corrugated pipe and a connecting piece in a surrounding mode, the outer side of the optimized corrugated pipe is located in the optimized balancing cavity, and the optimized balancing cavity is communicated with an external balancing cavity.
The pull rod assembly penetrates through the axis of the optimized balance cavity, one side of the pull rod assembly is connected with the guide plate on the side where the optimized balance cavity is located, and the other end of the pull rod assembly penetrates through the end ring on the side where the optimized balance cavity is located and then is connected with the end ring on the other side.
And a plurality of groups of pull rod assemblies which are uniformly distributed along the circumferential direction of the expansion joint are arranged in a staggered manner. The invention has the beneficial effects that: the invention arranges a plurality of groups of small-diameter corrugated pipes along two sides of the pipeline working corrugated pipe, and aims to replace a balance wave pipe with larger size in the pipeline. The two sides are symmetrically arranged, so that a larger balance area of the external corrugated pipe can be obtained, and the external corrugated pipe can be applied to large-size drift diameter pipelines. Because only need set up a set of work bellows in the pipeline, reduced the production quantity of major diameter bellows to greatly reduced product's the manufacturing degree of difficulty, production cycle and cost have improved the construction manufacturability, adopt the little pipe diameter balanced structure of multiunit peripheral hardware simultaneously, the maintenance and the change of every unit in the later stage of being convenient for wholly promote the reliability of product.
The optimized balance body is additionally arranged in the middle of the external pressure balance body, the optimized corrugated pipe is arranged in the external balance body in a displacement mode, the axial length size of the expansion joint can be integrally reduced, and the reliability is further improved.
Drawings
FIG. 1 is a diagram of a straight pipe pressure-balanced expansion joint structure and balanced stress principle of a conventional pipeline;
FIG. 2 is a schematic structural diagram of embodiment 1 of the present invention;
FIG. 3 is a force diagram of the present invention;
FIG. 4 is a schematic side view of the present invention;
FIG. 5 is a perspective view of the present invention;
FIG. 6 is a schematic structural view of embodiment 2 of the present invention;
FIG. 7 is a side view of FIG. 6;
in the figure: 1. the device comprises guide plates I, 2, pull rod assemblies I, 3, end rings I, 4, a working corrugated pipe, 5, pull rod assemblies II, 6, a guide cylinder, 7, end rings II, 8, a connecting plate, 9, an outer cylinder, 10, an external corrugated pipe section, 11, an external corrugated pipe, 12, a force transmission cylinder, 13, a fixing plate, 14, guide plates II, 15, a pull rod nut, 16, a pressure connection pipe, 17, an external balance cavity, 18, a pull rod assembly, 19, an external corrugated pipe balance assembly, 20, an optimized balance body, 21, an optimized balance cavity, 22, an optimized corrugated pipe, 23, end pipe assemblies I, 24 and end pipe assemblies II.
Detailed Description
The large-diameter straight pipe pressure balance type expansion joint balanced by external pressure corrugated pipes is adopted, the large-diameter straight pipe pressure balance type expansion joint is provided with a working corrugated pipe, two ends of the working corrugated pipe are respectively connected with an end pipe, a plurality of groups of pull rod assemblies and a plurality of groups of external corrugated pipe balance assemblies are arranged on the outer sides of the end pipes on the two sides along the circumferential direction, a plurality of groups of external corrugated pipe balance assemblies are uniformly distributed on the circumferential direction of each end pipe, each external corrugated pipe balance assembly consists of a guide plate, an end ring, an external pressing balance body and a pressure connection pipe, the guide plate and the end ring are sleeved on the end pipe on the same side, a sliding gap is arranged between the guide plate and the end pipe, the end ring is fixedly connected with the end pipe, two ends of the external pressing balance body are respectively and fixedly connected with the guide plate and the end pipe, the external pressure balance body comprises the external corrugated pipes positioned on, the peripheral balance cavity is communicated with the end pipe on the same side through a pressure connecting pipe, and the peripheral corrugated pipe is subjected to external pressure brought by media in the end pipe. And a plurality of groups of pull rod assemblies are uniformly distributed on the circumference of each end pipe, one end of each pull rod assembly is fixedly connected with the guide plate on one end pipe, and the other end of each pull rod assembly is fixedly connected with the end ring on the other end pipe.
The outer balance body that flattens comprises a biography power section of thick bamboo, the connecting plate, the peripheral hardware bellows, fixed plate and urceolus, be connected with the one end of a biography power section of thick bamboo that sets up with expansion joint axial unanimity on the deflector, the other end and the connecting plate of a biography power section of thick bamboo are connected, the connecting plate is connected with the fixed plate through the peripheral hardware bellows of cover in a biography power section of thick bamboo outside, the fixed plate cover is established in the outside of a biography power section of thick bamboo and is equipped with the sliding gap between the power section of thick bamboo, the outer border and the urceolus one end of cover in the peripheral hardware bellows outside of fixed plate are connected, the other end of urceolus is connected on.
As shown in fig. 5, a plurality of groups of peripheral bellows balance assemblies 19 are symmetrically arranged on two sides of the working bellows 4, so that a larger peripheral bellows balance area can be obtained, and the external bellows balance assemblies can be popularized and applied to oversized drift diameter pipelines in engineering.
The pull rod assemblies 18 are arranged on two sides of each group of peripheral corrugated pipe balance assemblies 19, and the end parts of the pull rod assemblies 18 are fixed by pull rod nuts or welded.
As shown in fig. 4 and 5, the plural groups of tie rod assemblies 18 uniformly distributed along the circumferential direction of the expansion joint are arranged in a staggered manner, which is more reasonable and effective, taking an external bellows balancing assembly 19 as an example, the left tie rod assembly is located above, the right tie rod assembly is located below, the left tie rod assembly of the external bellows balancing assembly 19 on the other end pipe corresponding to the bellows balancing assembly 19 is located below, and the right tie rod assembly is located above, so as to realize left-right staggering and front-back staggering.
As shown in fig. 6, in order to further utilize the space inside the external pressure balance body reasonably, an optimized balance body may be disposed in the middle of the external pressure balance body, the optimized balance body is an optimized balance cavity surrounded by an optimized corrugated pipe and a connecting member, the outside of the optimized corrugated pipe is located in the optimized balance cavity, the outside of the optimized corrugated pipe is pressed, and the optimized balance cavity is communicated with the external balance cavity.
As shown in fig. 7, after the optimized balance body is added, the optimal arrangement form of the pull rod corrugated pipe is that the pull rod assembly passes through the axis of the optimized balance cavity, one side of the pull rod assembly is connected with the guide plate on the side where the optimized balance cavity is located, and the other end of the pull rod assembly passes through the end ring on the side where the optimized balance cavity is located and then is connected with the end ring on the other side. The external corrugated pipe balance assemblies on the two end pipes are arranged in a staggered mode, so that the pull rod assemblies are connected, and the pull rod assemblies on two sides are prevented from being blocked.
The effective area of the working corrugated pipe 4 is 2 of the effective area of a single peripheral corrugated pipeNThe number of times of the total number of the parts,Nthe number of groups of the peripheral corrugated pipes is distributed outside the single side. The number of the external corrugated pipe assemblies arranged on the two sides can also be unequal, but the effective area of the working corrugated pipe is equal to the total area of the external corrugated pipes.
Compared with the conventional straight pipe pressure balance type expansion joint structure of a pipeline, the integral structure is shown in figure 2, the core invention is that a plurality of groups of small-diameter corrugated pipes are uniformly distributed along the periphery of an end pipe to replace balance waves, and working waves are generatedThe two sides of the bellows 4 are arranged, the balance area of the external bellows can be integrally doubled, the medium in the pipeline is led into each external balance cavity by adopting the pressure connecting pipe 16, and the pressure of the external bellows is the same as the pressure in the pipeline. One end of the pull rod assembly I2 is connected with the end ring II 7, the other end of the pull rod assembly I is connected with the guide plate I1, and a pull rod hole is formed in the end ring II 7. One end of the second pull rod assembly 5 is connected with the first end ring 3, the other end of the second pull rod assembly is connected with the second guide plate 14, and a pull rod hole is formed in the first end ring 3. The pull rod assemblies are arranged on two sides of each group of peripheral balance structures, and when the whole product is seen in a mode of combining fig. 4 and 5, the pull rod assemblies I2 and the pull rod assemblies II 5 are arranged in a staggered mode, and details are shown in fig. 4. The whole structure only has one group of working corrugated pipes 4, a plurality of groups of peripheral corrugated pipes uniformly distributed along the circumference play the role of balance waves, and the effective area of the working corrugated pipes 4 is 2 of the effective area of a single peripheral corrugated pipeNThe number of times of the total number of the parts,Nthe number of groups of the peripheral corrugated pipes is distributed outside the single side. Overall structure only needs to set up a set of work bellows 4, has reduced bellows material's use amount, has reduced product cost, replaces the balanced bellows shop of bigger pipe diameter with the multiunit minor diameter bellows simultaneously, in major diameter or even super large diameter pipeline is used, can reduce the manufacturing degree of difficulty of product by a wide margin. In addition, the design structure of the product also has the characteristics of small required installation length and small overall rigidity of the expansion joint.
The structural balance principle diagram is shown in fig. 3, the balance condition is N × (F1 + F2) = F, F is the blind flange force at one end of the pipeline, F1 and F2 are the balance forces corresponding to the single group of balance structures at two sides of the working corrugated pipe 4, and the total number of the balance structures along the circumference is 2N。
Example 1
The large-diameter straight pipe pressure balance type expansion joint adopting external pressure corrugated pipe balance is provided with a working corrugated pipe 4, two sides of the working corrugated pipe 4 are respectively connected with an end pipe, and a plurality of groups of pull rod assemblies 18 and a plurality of groups of external corrugated pipe balance assemblies are arranged on the outer sides of the end pipes on the two sides along the circumferential direction. The diameter of the working corrugated pipe 4 positioned at the center is far lower than that of the original balance wave, and the overall outer diameter of the peripheral corrugated pipe balance assemblies 19 which are arranged in the circumferential direction is also lower than that of the original balance corrugated pipe.
A plurality of groups of peripheral corrugated pipe balance assemblies 19 are uniformly distributed on the circumference of each end pipe, each peripheral corrugated pipe balance assembly 19 comprises a guide plate, an end ring, a force transmission cylinder 12, a connecting plate 8, a peripheral corrugated pipe 11, a fixing plate 13, an outer cylinder 9 and a pressure connecting pipe 16, the guide plate and the end ring are sleeved on the end pipe on the same side, the guide plate and the end ring are arranged in parallel and are perpendicular to each other in the axial direction of an expansion joint, a sliding gap is arranged between the guide plate and the end pipe, the end ring is fixedly connected with the end pipe to form an end pipe assembly, the guide plate is connected with one end of the force transmission cylinder 12 which is axially consistent with the expansion joint, the other end of the force transmission cylinder 12 is connected with the connecting plate 8, the connecting plate 8 is connected with the fixing plate 13 through the peripheral corrugated pipe sleeved on the outer side of the force transmission cylinder 12, the fixing plate 13 is sleeved with the outer side of the force, the other end of the outer cylinder 9 is connected to an end ring II 7, an external balance cavity is enclosed by the end ring II 7, the outer cylinder 9, the fixing plate 13, an external corrugated pipe and the connecting plate 8, and the external balance cavity is communicated with the end pipe on the same side through a pressure connecting pipe 16; and a plurality of groups of pull rod assemblies 18 are uniformly distributed on the circumference of each end pipe, one end of each pull rod assembly 18 is fixedly connected with the guide plate on the end pipe on one side of the working corrugated pipe, and the other end of each pull rod assembly 18 is fixedly connected with the end ring I3 on the end pipe on the other side of the working corrugated pipe.
Example 2
As shown in fig. 6 and 7, in order to reduce the force arm of the end pipe assembly (the distance from the pull rod hole to the pipeline) and thereby reduce the bending stress and the deformation deflection of the welding seam at the root of the end pipe assembly, and optimize the stress state, the pull rod corrugated pipe is arranged inside the external corrugated pipe and plays the roles of medium sealing and pull rod isolation, and the axes of the external corrugated pipe, the pull rod corrugated pipe and the pull rod are coaxial, so that the force arm of the pull rod to the end pipe assembly can be integrally reduced, the stress state and the structural deformation of the end pipe assembly can be optimized, and the material consumption can. The peripheral balance mechanisms on the two sides of the working corrugated pipe are mutually staggered to arrange pull rods, and the pull rod corrugated pipe displaces to be arranged in the inner cavity of the peripheral corrugated pipe, so that the axial length dimension of the expansion joint can be integrally reduced.
The optimized balance weight is additionally arranged on the basis of the embodiment 1, the pull rod assembly penetrates through the center of the force transmission barrel and is overlapped with the axis of the whole outer flat balance weight, the optimized balance weight is composed of an optimized corrugated pipe 22 and an end pipe assembly, the optimized corrugated pipe 22 is sleeved on the pull rod assembly, one end of the optimized corrugated pipe 22 is connected to a connecting plate through the end pipe assembly I23 sleeved on the outer side of the optimized corrugated pipe 22, the other end of the optimized corrugated pipe 22 is connected to the connecting plate or an end ring through the end pipe assembly II 24, the end pipe assembly I, the end pipe assembly II, the optimized corrugated pipe and the connecting plate form an optimized balance cavity in a surrounding mode, the optimized balance cavity is communicated with the outer balance cavity through an opening in.
Claims (7)
1. Adopt the balanced major diameter straight tube pressure balance type expansion joint of peripheral hardware external pressure bellows, be equipped with the work bellows, be connected with an end pipe respectively in the both sides of work bellows, arranged multiunit pull rod subassembly and multiunit peripheral hardware bellows balance assembly, its characterized in that along circumference in the outside of both sides end pipe:
a plurality of groups of peripheral corrugated pipe balancing assemblies are uniformly distributed on the circumference of each end pipe, each peripheral corrugated pipe balancing assembly consists of a guide plate, an end ring, an outer flattening balance body and a pressure connection pipe, the guide plate and the end ring are sleeved on the end pipe on the same side, a sliding gap is arranged between the guide plate and the end pipe, the end ring is fixedly connected with the end pipe, two ends of the outer flattening balance body are respectively and fixedly connected with the guide plate and the end pipe, the outer pressure balance body comprises a peripheral corrugated pipe positioned on the outer side of the end pipe, the outer pressure balance body is provided with an outer balancing cavity formed by the peripheral corrugated pipe and a connecting piece, the outer side of the peripheral corrugated pipe is positioned in the outer balancing cavity, and the outer balancing cavity is communicated with the end pipe;
and a plurality of groups of pull rod assemblies are uniformly distributed on the circumference of each end pipe, one end of each pull rod assembly is fixedly connected with the guide plate on one end pipe, and the other end of each pull rod assembly is fixedly connected with the end ring on the other end pipe.
2. The large-diameter straight pipe pressure-balanced expansion joint balanced by an external pressure corrugated pipe as claimed in claim 1, wherein: the external pressure balance body comprises a force transmission barrel, a connecting plate, an external corrugated pipe, a fixed plate and an external barrel, wherein one end of the force transmission barrel is axially consistent with the expansion joint and is connected with the guide plate, the other end of the force transmission barrel is connected with the connecting plate, the connecting plate is connected with the fixed plate through the external corrugated pipe sleeved on the outer side of the force transmission barrel, the fixed plate is sleeved on the outer side of the force transmission barrel and is provided with a sliding gap between the force transmission barrel and the force transmission barrel, the outer edge of the fixed plate is connected with one end of the external barrel sleeved on the outer side of the external corrugated pipe, the other end of the external barrel is connected with an end ring, the external barrel, the fixed plate, the.
3. The large-diameter straight pipe pressure-balanced expansion joint balanced by an external pressure corrugated pipe as claimed in claim 1, wherein: the multiple groups of external corrugated pipe balance assemblies are symmetrically arranged on two sides of the working corrugated pipe.
4. The large-diameter straight pipe pressure-balanced expansion joint balanced by an external pressure corrugated pipe as claimed in claim 2, wherein: the pull rod assemblies are arranged on two sides of each group of peripheral corrugated pipe balance assemblies.
5. The large-diameter straight pipe pressure-balanced expansion joint balanced by an external pressure corrugated pipe as claimed in claim 1, wherein: the middle part in the external pressure balancing body is provided with an optimized balancing body, the optimized balancing body is an optimized balancing cavity formed by an optimized corrugated pipe and a connecting piece in a surrounding mode, the outer side of the optimized corrugated pipe is located in the optimized balancing cavity, and the optimized balancing cavity is communicated with an external balancing cavity.
6. The large-diameter straight pipe pressure-balanced expansion joint balanced by an external pressure corrugated pipe as claimed in claim 5, wherein: the pull rod assembly penetrates through the axis of the optimized balance cavity, one side of the pull rod assembly is connected with the guide plate on the side where the optimized balance cavity is located, and the other end of the pull rod assembly penetrates through the end ring on the side where the optimized balance cavity is located and then is connected with the end ring on the other side.
7. The large-diameter straight pipe pressure-balanced expansion joint balanced by an external pressure corrugated pipe as claimed in claim 4, 5 or 6, wherein: and a plurality of groups of pull rod assemblies which are uniformly distributed along the circumferential direction of the expansion joint are arranged in a staggered manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010773021.2A CN111963808A (en) | 2020-08-04 | 2020-08-04 | Large-diameter straight pipe pressure balance type expansion joint balanced by external pressure corrugated pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010773021.2A CN111963808A (en) | 2020-08-04 | 2020-08-04 | Large-diameter straight pipe pressure balance type expansion joint balanced by external pressure corrugated pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111963808A true CN111963808A (en) | 2020-11-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010773021.2A Pending CN111963808A (en) | 2020-08-04 | 2020-08-04 | Large-diameter straight pipe pressure balance type expansion joint balanced by external pressure corrugated pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111963808A (en) |
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2020
- 2020-08-04 CN CN202010773021.2A patent/CN111963808A/en active Pending
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