CN210600644U - Double-layer metal expansion joint online leakage monitoring device - Google Patents
Double-layer metal expansion joint online leakage monitoring device Download PDFInfo
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- CN210600644U CN210600644U CN201921139602.XU CN201921139602U CN210600644U CN 210600644 U CN210600644 U CN 210600644U CN 201921139602 U CN201921139602 U CN 201921139602U CN 210600644 U CN210600644 U CN 210600644U
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Abstract
The utility model relates to a nuclear power maintenance technical field specifically discloses a double-deck metal expansion joint online leakage monitoring device for the damaged condition of monitoring double-deck metal expansion joint has solved the present application outward appearance visual mode and to double-deck metal expansion joint leakage monitoring's limitation, has realized the online monitoring discovery when double-deck metal expansion joint outer layer is damaged alone or the inner layer is damaged alone.
Description
Technical Field
The utility model belongs to the technical field of the nuclear power maintenance, concretely relates to double-deck metal expansion joint online leakage monitoring device.
Background
The structure of the double-layer metal expansion joint is shown in fig. 1 and fig. 2, and is a pressure pipeline boundary, which plays an axial compensation role for pipeline expansion with heat and contraction with cold, and the pressure pipeline medium leakage can be caused by the damage of the double-layer metal expansion joint. For example, the double-layer metal expansion joint for the second loop of the nuclear power plant is damaged, steam leakage of the conventional second loop of the nuclear power plant island is caused, so that the nuclear power plant is stopped, and meanwhile, a large amount of steam is generated in a plant of the nuclear power plant, and false alarm of a fire alarm probe is possibly caused.
At present, the leakage monitoring of the double-layer metal expansion joint for the M310 type pressurized water reactor nuclear power station is carried out only by visual appearance, and the monitoring method has certain limitation, namely the leakage monitoring can be found only when an internal steam medium leaks outwards in the monitoring process, and the inner layer and the outer layer of the double-layer metal expansion joint are damaged. When any one of the inner layer and the outer layer of the double-layer metal expansion joint is damaged independently, the current monitoring scheme cannot be used for on-line monitoring.
Disclosure of Invention
An object of the utility model is to provide a double-deck metal expansion joint online leakage monitoring device realizes the damaged on-line monitoring of the arbitrary independent one deck of double-deck metal expansion joint.
The technical scheme of the utility model as follows:
the double-layer metal expansion joint online leakage monitoring device is used for monitoring the damage condition of the double-layer metal expansion joint, the double-layer metal expansion joint is divided into an outer layer and an inner layer, and the outer layer and the inner layer are both of a corrugated pipe structure and serve as the boundary of a pressure pipeline to play an axial compensation role in thermal expansion and cold contraction of the pipeline;
the double-layer metal expansion joint is vertically arranged along the axial direction, the ear plate is positioned at the lower part of the double-layer metal expansion joint, and the ring plate is positioned at the upper part of the double-layer metal expansion joint;
a stud is arranged between the lug plate and the ring plate and is fixed with the lug plate and the ring plate through nuts respectively so as to limit the telescopic stroke of the double-layer metal expansion joint;
the monitoring device comprises an equal-diameter three-way joint, a pressure pipeline, a valve A, a pressure gauge joint, a pressure gauge and a valve B;
a joint is arranged at the hole part at the lower part of the straight end pipe of the double-layer metal expansion joint and extends into the space between the outer layer and the inner layer of the double-layer metal expansion joint;
the pressure pipeline is divided into three branch pipes through an equal-diameter tee joint;
the branch pipe A is connected with a pressure gauge through a pressure gauge joint, and a valve A is arranged on the branch pipe A;
the branch pipe B is communicated with a pressure air source, and a valve B is arranged on the branch pipe B;
the branch pipe C is connected with a joint.
The pressure gauge joint is connected with the pressure gauge in a thread sealing mode.
The beneficial effects of the utility model reside in that:
(1) the utility model provides a present use outward appearance mode of visualing to double-deck metal expansion joint leakage monitoring's limitation, realized the on-line monitoring discovery when double-deck metal expansion joint outer layer is damaged alone or the inner layer is damaged alone.
(2) The utility model discloses a to carrying out online pressure monitoring between double-deck metal expansion joint inlayer and the skin to with the initial pressure contrast, realize the damaged online monitoring of the arbitrary independent one deck of double-deck metal expansion joint, in order in time to restore damaged double-deck metal expansion joint, avoid double-deck metal expansion joint to take place to leak, ensured double-deck metal expansion joint's online safety, guarantee pipeline safe operation.
Drawings
FIG. 1 is a schematic axial half-surface structure of a double-layer metal corrugated pipe;
FIG. 2 is a schematic view of a radial structure of a double-layer metal corrugated pipe;
fig. 3 is a schematic view of an online leakage monitoring device.
In the figure: 1-ear plate; 2-a linker; 3-an outer layer; 4-an inner layer; 5-a stud; 6-a nut; 7-ring plate; 8-double layer metal expansion joints; 9-equal-diameter three-way joint; 10-pressure pipeline; 11-valve a; 12-pressure gauge connection; 13-pressure gauge; 14-valve B.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The double-layer metal expansion joint online leakage monitoring device shown in fig. 3 is used for monitoring the damage condition of a double-layer metal expansion joint 8 and comprises an equal-diameter three-way joint 9, a pressure pipeline 10, a valve A11, a pressure gauge joint 12, a pressure gauge 13 and a valve B14.
As shown in fig. 1 and 2, the double-layer metal expansion joint 8 is divided into an outer layer 3 and an inner layer 4, and both the outer layer 3 and the inner layer 4 are of a corrugated pipe structure and serve as a pressure pipe boundary to play an axial compensation role for thermal expansion and cold contraction of a pipe.
The double-layer metal expansion joint 8 is vertically arranged along the axial direction, the ear plate 1 is positioned at the lower part of the double-layer metal expansion joint 8, the ring plate 7 is positioned at the upper part of the double-layer metal expansion joint 8 and is connected with the outer layer 3 and the inner layer 4 of the double-layer metal expansion joint 8 in a welding mode. The double-end stud 5 is arranged between the lug plate 1 and the ring plate 7, and the double-end stud 5 is fixed with the lug plate 1 and the ring plate 7 through nuts 6 respectively so as to limit the telescopic stroke of the double-layer metal expansion joint 8.
The lower part of the straight end pipe of the double-layer metal expansion joint 8 is provided with a joint 2, and the joint 2 extends into the space between the outer layer 3 and the inner layer 4 of the double-layer metal expansion joint 8 and is connected by adopting a welding mode.
The pressure pipeline 10 is divided into three branch pipes through an equal-diameter tee joint 9, wherein the branch pipe A is connected with a pressure gauge 13 through a pressure gauge joint 12, and a valve A11 is arranged on the branch pipe A; the branch pipe B is communicated with a pressure air source, and a valve B14 is arranged on the branch pipe B; the branch pipe C is connected with the joint 2.
The pressure gauge joint 12 is connected with the pressure gauge 13 in a threaded sealing mode.
The method for monitoring the online leakage of the double-layer metal expansion joint is operated by adopting the device, and the online state of the double-layer metal expansion joint 8 is judged according to a pressure monitoring result to prevent the leakage of the double-layer metal expansion joint, and comprises the following steps of:
step 1: double-layer metal expansion joint off-line state pressure monitoring
When no medium flows in the inner layer of the double-layer metal expansion joint 8, the double-layer metal expansion joint 8 is in an off-line state, at the moment, the valve A11 and the valve B14 are opened, and the pressure source is used for pressurizing the space between the inner layer and the outer layer of the double-layer metal expansion joint 8;
when the reading of the pressure gauge 13 is kept stable at the pressure P and P is more than 0 and less than the inner layer pressure, the valve B14 is closed, the pressurization is stopped, the reading of the pressure gauge 13 is observed to be kept stable at the pressure P continuously, and P is more than 0 and less than the inner layer pressure, so that P is the initial pressure between the inner layer and the outer layer of the double-layer metal expansion joint 8;
step 2: double-layer metal expansion joint 8 online state pressure monitoring
When the inner layer of the double-layer metal expansion joint 8 is in an online state of the double-layer metal expansion joint 8 when medium flows through the inner layer, opening a valve A11, closing a valve B14, monitoring a pressure gauge 13 in real time, and recording the online pressure P1 between the inner layer and the outer layer of the double-layer metal expansion joint 8;
and step 3: on-line state judgment of double-layer metal expansion joint 8
The online state of the double-layer metal expansion joint 8 is judged by comparing the online pressure P1 with the initial pressure P:
when P1 is less than P and P1 is gradually stabilized in a normal pressure state, the double-layer metal expansion joint 8 is broken in an outer layer in a linear state;
when P1 is P and P1 is stable, the double-layer metal expansion joint 8 is normal in the on-line state;
when P1 is more than P and P1 is gradually stabilized in a state of keeping the same pressure as the inner pipe of the double-layer metal expansion joint 8, the double-layer metal expansion joint 8 is broken in the on-line state of the inner layer.
And 4, step 4: double-layer metal expansion joint 8 online leakage prevention
And (3) carrying out corresponding treatment on the double-layer metal expansion joint 8 according to the judgment result of the step (3) to prevent online leakage:
when the outer layer is damaged in the online state, the double-layer metal expansion joint 8 is subjected to online repair treatment;
when the online state is normal, the double-layer metal expansion joint 8 is continuously monitored online;
and when the inner layer is damaged in the online state, the double-layer metal expansion joint 8 is replaced offline.
Claims (2)
1. The double-layer metal expansion joint online leakage monitoring device is used for monitoring the damage condition of a double-layer metal expansion joint (8), wherein the double-layer metal expansion joint (8) is divided into an outer layer (3) and an inner layer (4), the outer layer (3) and the inner layer (4) are both of a corrugated pipe structure and are used as the boundary of a pressure pipeline to play an axial compensation role for the expansion caused by heat and the contraction caused by cold of the pipeline;
the double-layer metal expansion joint (8) is vertically arranged along the axial direction, the ear plate (1) is positioned at the lower part of the double-layer metal expansion joint (8), and the ring plate (7) is positioned at the upper part of the double-layer metal expansion joint (8);
a stud (5) is arranged between the ear plate (1) and the ring plate (7), and the stud (5) is fixed with the ear plate (1) and the ring plate (7) through a nut (6) respectively so as to limit the telescopic stroke of the double-layer metal expansion joint (8);
the monitoring device is characterized in that: the pressure pipe comprises an equal-diameter three-way joint (9), a pressure pipeline (10), a valve A (11), a pressure gauge joint (12), a pressure gauge (13) and a valve B (14);
a joint (2) is arranged at the hole part of the lower part of the straight end pipe of the double-layer metal expansion joint (8), and the joint (2) extends into the space between the outer layer (3) and the inner layer (4) of the double-layer metal expansion joint (8);
the pressure pipeline (10) is divided into three branch pipes through an equal-diameter tee joint (9);
wherein the branch pipe A is connected with a pressure gauge (13) through a pressure gauge joint (12), and a valve A (11) is arranged on the branch pipe A;
the branch pipe B is communicated with a pressure air source, and a valve B (14) is arranged on the branch pipe B;
the branch pipe C is connected with the joint (2).
2. The on-line leakage monitoring device for the double-layer metal expansion joint as claimed in claim 1, wherein: the pressure gauge joint (12) is connected with the pressure gauge (13) in a thread sealing mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921139602.XU CN210600644U (en) | 2019-07-19 | 2019-07-19 | Double-layer metal expansion joint online leakage monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921139602.XU CN210600644U (en) | 2019-07-19 | 2019-07-19 | Double-layer metal expansion joint online leakage monitoring device |
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| CN210600644U true CN210600644U (en) | 2020-05-22 |
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| CN201921139602.XU Active CN210600644U (en) | 2019-07-19 | 2019-07-19 | Double-layer metal expansion joint online leakage monitoring device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110345330A (en) * | 2019-07-19 | 2019-10-18 | 福建福清核电有限公司 | A kind of online leakage monitor of double-level-metal expansion joint and method |
| CN114198585A (en) * | 2022-02-17 | 2022-03-18 | 南京深度***工程有限公司 | Length compensator with sealing detection function |
| CN114593302A (en) * | 2022-03-29 | 2022-06-07 | 诸暨市沣泽动力机械有限公司 | Nonmetal expansion joint capable of realizing double-layer drainage |
| CN114893627A (en) * | 2022-04-25 | 2022-08-12 | 中国核电工程有限公司 | Gas-cooled micro-reactor straight pipe type main pipeline |
-
2019
- 2019-07-19 CN CN201921139602.XU patent/CN210600644U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110345330A (en) * | 2019-07-19 | 2019-10-18 | 福建福清核电有限公司 | A kind of online leakage monitor of double-level-metal expansion joint and method |
| CN114198585A (en) * | 2022-02-17 | 2022-03-18 | 南京深度***工程有限公司 | Length compensator with sealing detection function |
| CN114593302A (en) * | 2022-03-29 | 2022-06-07 | 诸暨市沣泽动力机械有限公司 | Nonmetal expansion joint capable of realizing double-layer drainage |
| CN114893627A (en) * | 2022-04-25 | 2022-08-12 | 中国核电工程有限公司 | Gas-cooled micro-reactor straight pipe type main pipeline |
| CN114893627B (en) * | 2022-04-25 | 2023-09-15 | 中国核电工程有限公司 | Air-cooled micro-reactor straight pipe type main pipeline |
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