CN217604147U - Pipeline connecting structure of air preheater bypass high-pressure economizer - Google Patents
Pipeline connecting structure of air preheater bypass high-pressure economizer Download PDFInfo
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- CN217604147U CN217604147U CN202221591935.8U CN202221591935U CN217604147U CN 217604147 U CN217604147 U CN 217604147U CN 202221591935 U CN202221591935 U CN 202221591935U CN 217604147 U CN217604147 U CN 217604147U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses a pipeline connection structure of air preheater bypass high pressure economizer, including the internal piping, parallelly connected elbow pipe, connect in the adapter sleeve between an internal piping tip and a tip of parallelly connected elbow pipe, the one end of internal piping has first screw thread section, be provided with first flange on the first screw thread section, adapter sleeve's both ends are fixed second flange and the third flange of being provided with respectively, the one end of parallelly connected elbow pipe has the second screw thread section, be provided with the fourth flange on the second screw thread section, between first flange and the second homogeneous phase flange, between third flange and the fourth flange fixed connection, internal piping and parallelly connected elbow pipe all with be provided with location structure between the adapter sleeve, the external diameter of first screw thread section and second screw thread section is greater than adapter sleeve's internal diameter.
Description
Technical Field
The utility model relates to a pipeline connection structure of air preheater bypass high pressure economizer.
Background
The economizer is a device which is arranged at the lower part of a flue at the tail part of a boiler and used for recovering the waste heat of exhausted smoke, heats the water fed by the boiler into a heating surface of saturated water under the pressure of a steam drum, and reduces the exhaust temperature of the smoke, saves energy and improves the efficiency because the economizer absorbs the heat of high-temperature smoke.
The economizer among the prior art includes the shell body, parallel arrangement in a plurality of inside pipes in the shell body, with the snakelike return bend (parallelly connected elbow pipe) of the parallelly connected intercommunication of the tip of adjacent inside pipe, the connected mode between inside pipe and the snakelike return bend is welded fastening usually.
The leakage fault of the large-capacity boiler economizer is mainly caused by leakage of coiled pipes, most of the leakage is caused by three reasons of (1) wear of pipe walls, (2) poor welding quality or crack generation of pipe walls in a weld heat affected zone, and the like, (3) corrosion of inner walls, and the like, so that the corresponding coiled pipes need to be replaced in time after the leakage occurs.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the defect that exists among the prior art, provide a pipeline connection structure of air preheater bypass high pressure economizer, greatly reduced fault rate to reduce the maintenance cost.
In order to realize the technical effects, the utility model adopts the technical scheme that: the utility model provides a pipeline connection structure of air preheater bypass high pressure economizer, includes internal pipeline, parallelly connected elbow pipe, connect in an internal pipeline tip with adapter sleeve between a tip of parallelly connected elbow pipe, the one end of internal pipeline has first screw thread section, be provided with rather than the first flange of looks screw-thread fit on the first screw thread section, adapter sleeve's both ends are fixed respectively and are provided with second flange and third flange, the one end of parallelly connected elbow pipe has the second screw thread section, be provided with rather than the fourth flange of looks screw-thread fit on the second screw thread section, first flange with between the second flange third flange with homogeneous phase fixed connection between the fourth flange, internal pipeline and parallelly connected elbow pipe all with be provided with location structure between the adapter sleeve, the external diameter of first screw thread section and second screw thread section is greater than adapter sleeve's internal diameter.
In a further improvement, the positioning structure comprises positioning holes which are arranged at two end parts of the connecting sleeve and communicated with the pipe cavity of the connecting sleeve, and the first thread section and the second thread section respectively penetrate through the corresponding first connecting flange, the second connecting flange, the third connecting flange and the fourth connecting flange and are inserted into the corresponding positioning holes.
In a further improvement, the second connecting flange, the third connecting flange and the connecting sleeve are welded and fixed.
In a further improvement, the first connecting flange and the second connecting flange are welded and fixed, and the third connecting flange and the fourth connecting flange are fixedly connected through a fastener.
In a further improvement, the first connecting flange and the second connecting flange, and the third connecting flange and the fourth connecting flange are fixedly connected through fasteners.
In a further refinement, the fastening element is a fastening bolt.
In a further improvement, sealing structures are arranged between the first connecting flange and the second connecting flange and between the third connecting flange and the fourth connecting flange.
In a further improvement, the sealing structure is a sealing gasket arranged between the first connecting flange and the second connecting flange and between the third connecting flange and the fourth connecting flange.
In a further improvement, the middle part of the connecting sleeve is provided with an expansion joint.
The utility model has the advantages and beneficial effects that: through increasing adapter sleeve, and set up the expansion joint on adapter sleeve, reduce the stress deformation because of the difference in temperature arouses, reduce the damage rate of parallelly connected return bend, there is flange through threaded connection on parallelly connected return bend and the internal pipe in addition, and flange is connected with the flange of adapter sleeve tip, original welded connection's mode has been replaced, there is not the welding seam crackle phenomenon because of welding quality is bad to cause from this internal pipe and the tip of parallelly connected return bend, reduce the seepage phenomenon, in addition because adapter sleeve has been increased, make and to dismantle between parallelly connected return bend and the internal pipe, when needing to be changed, need not to cut, only need to demolish the back with the fastener between third flange and the fourth flange, demolish the fourth flange on the second screw thread section of parallelly connected return bend and can change, it is convenient to maintain, greatly reduced the cost of maintaining.
Drawings
FIG. 1 is a first schematic view of the present invention;
FIG. 2 is a second schematic view of the present invention;
FIG. 3 is an exploded view of the present invention;
FIG. 4 is a schematic view of an internal conduit;
FIG. 5 is a schematic view of a coupling sleeve;
FIG. 6 is a schematic view of the connection sleeve with the second and third connection flanges;
FIG. 7 is a schematic view of a parallel elbow;
fig. 8 is a schematic view of a first connecting flange.
Wherein: 1. an inner conduit; 2. connecting a sleeve; 3. bending pipes in parallel; 4. a first thread segment; 6. a second thread segment; 7. a first connecting flange; 8. a second connecting flange; 9. a third connecting flange; 10. a fourth connecting flange; 11. an expansion joint; 12. and (7) positioning the holes.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows: as shown in fig. 1 to 8, a pipeline connecting structure of an air preheater bypass high-pressure economizer includes an internal pipeline 1, a parallel elbow pipe, and a connecting sleeve 2 connected between one end of the internal pipeline 1 and one end of the parallel elbow pipe, wherein one end of the internal pipeline 1 has a first threaded section 4, the first threaded section 4 is provided with a first connecting flange 7 in threaded fit with the first threaded section 4, two ends of the connecting sleeve 2 are respectively and fixedly provided with a second connecting flange 8 and a third connecting flange 9, one end of the parallel elbow pipe has a second threaded section 6, the second threaded section 6 is provided with a fourth connecting flange 10 in threaded fit with the second threaded section 6, the first connecting flange 7 and the second connecting flange 8 are fixedly connected, the third connecting flange 9 and the fourth connecting flange 10 are fixedly connected, positioning structures are respectively arranged between the internal pipeline 1 and the parallel elbow pipe and the connecting sleeve 2, and outer diameters of the first threaded section 4 and the second threaded section 6 are larger than an inner diameter of the connecting sleeve 2.
In order to reduce the stress deformation of the joint caused by the temperature difference change, the expansion joint 11 is arranged in the middle of the connecting sleeve 2, so that the stability of the whole connecting structure is ensured.
In order to improve the axial positioning between the connecting sleeve 2 and the internal pipeline 1 and between the connecting sleeve and the parallel elbow 3, the positioning structure comprises positioning holes 12 which are arranged at two end parts of the connecting sleeve 2 and communicated with the pipe cavity of the connecting sleeve, and the first thread section 4 and the second thread section 6 respectively penetrate through the corresponding first connecting flange 7, the second connecting flange 8, the third connecting flange 9 and the fourth connecting flange 10 to be inserted into the corresponding positioning holes 12.
In order to further improve the sealing effect, sealing structures are arranged between the first connecting flange 7 and the second connecting flange 8 and between the third connecting flange 9 and the fourth connecting flange 10, the sealing structures are sealing gaskets arranged between the first connecting flange 7 and the second connecting flange 8 and between the third connecting flange 9 and the fourth connecting flange 10, therefore, the connecting structure is provided with double-layer sealing structures between the internal pipeline 1 and the connecting sleeve 2 and between the parallel elbow 3 and the connecting sleeve 2, the first layer of sealing structure is a first layer of sealing structure between the end parts of the first threaded section 4 and the second threaded section 6 on the internal pipeline 1 and the parallel elbow 3 and the bottom surface of the positioning hole 12 arranged on the connecting sleeve 2, as the outer diameters of the first threaded section 4 and the second threaded section 6 are larger than the inner diameter of the connecting sleeve 2, a first sealing structure is formed, and the second sealing structure is a sealing gasket arranged between the connecting flanges, thereby ensuring the sealing performance of the whole coal economizer and greatly reducing the leakage phenomenon.
In order to facilitate processing and manufacturing, the second connecting flange 8, the third connecting flange 9 and the connecting sleeve 2 are welded and fixed.
Since most of the leakage phenomenon occurs on the parallel elbow 3, in order to facilitate the replacement of the parallel elbow, in this embodiment, it is preferable that the first connecting flange 7 and the second connecting flange 8 are welded and fixed, and the third connecting flange 9 and the fourth connecting flange 10 are fixedly connected by a fastener, so that when the parallel elbow 3 needs to be replaced, the third connecting flange 9 and the fourth connecting flange 10 are removed by removing the fastener, and then the fourth connecting flange 10 is removed from the second thread section 6, so that the step of cutting when the welding is removed is avoided, and in addition, preferably, the fastener is a fastening bolt.
Connecting and detaching: when the connecting device is connected, firstly, the first connecting flange 7 is meshed with the first thread section 4 on the internal pipeline 1, then the first thread section 4 penetrates through the second connecting flange 8 and then is inserted into the positioning hole 12 in the connecting sleeve 2 and is abutted tightly, then the first connecting flange 7 is connected with the second connecting flange 8, similarly, when the parallel bent pipe 3 is connected, the fourth connecting flange 10 is meshed with the second thread section 6, then the second thread section 6 penetrates through the third connecting flange 9 and then is inserted into the positioning hole 12 in the connecting sleeve 2 and is abutted tightly, then the fourth connecting flange 10 is fixed with the third connecting flange 9 through a fastener, the parallel bent pipe 3 and the internal pipeline 1 do not need to be welded in the connecting mode, a welding seam area and a welding stress area do not exist, therefore, cracks and cracking phenomena can be greatly reduced, and in addition, the dismounting process when the parallel bent pipe 3 needs to be replaced is as follows: firstly, the fastening piece between the third connecting flange 9 and the fourth connecting flange 10 is removed, then the two ends of the parallel elbow 3 are removed from the corresponding two connecting sleeves 2, and then the fourth connecting flange 10 matched with the second thread section 6 on the parallel elbow 3 is removed to be replaced.
The second embodiment: the difference from the first embodiment is that: the first connecting flange 7 and the second connecting flange 8, and the third connecting flange 9 and the fourth connecting flange 10 are fixedly connected by fasteners, in this embodiment, the connecting mode between the connecting flange on the connecting sleeve 2 and the connecting flange on the inner pipeline 1 is changed from welding to fastening, so that the operation is more convenient in the case that the connecting sleeve 2 needs to be replaced, and because the connecting sleeve 2 and the parallel bent pipe 3 are both outside the economizer casing, the failure rate is higher than that of the inner pipeline 1, and the maintenance efficiency is further improved by changing the connecting mode.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The utility model provides a pipeline connection structure of air preheater bypass high pressure economizer, its characterized in that, includes internal pipeline, parallelly connected elbow pipe, connect in internal pipeline a tip with adapter sleeve between the tip of parallelly connected elbow pipe, the one end of internal pipeline has first screw thread section, be provided with rather than the first flange of looks screw-thread fit on the first screw thread section, adapter sleeve's both ends are fixed respectively and are provided with second flange and third flange, the one end of parallelly connected elbow pipe has the second screw thread section, be provided with rather than the fourth flange of looks screw-thread fit on the second screw thread section, first flange with between the second flange homogeneous phase fixed connection between the third flange with between the fourth flange, internal pipeline and parallelly connected elbow pipe all with be provided with location structure between the adapter sleeve, the external diameter of first screw thread section and second screw thread section is greater than adapter sleeve's internal diameter.
2. The pipe connection structure of the air preheater bypass high-pressure economizer according to claim 1, wherein the positioning structure comprises positioning holes which are formed in two end portions of the connection sleeve and communicated with a pipe cavity of the connection sleeve, and the first thread section and the second thread section respectively penetrate through the corresponding first connection flange, the corresponding second connection flange, the corresponding third connection flange and the corresponding fourth connection flange and are inserted into the corresponding positioning holes.
3. The pipe connection structure of the air preheater bypass high-pressure economizer of claim 1, wherein the second connection flange, the third connection flange and the connection sleeve are welded and fixed.
4. The pipe connection structure of the air preheater bypass high-pressure economizer of claim 1, wherein the first connection flange and the second connection flange are welded and fixed, and the third connection flange and the fourth connection flange are fixedly connected through a fastener.
5. The pipe connection structure of the air preheater bypass high-pressure economizer of claim 1, wherein the first connection flange and the second connection flange, and the third connection flange and the fourth connection flange are fixedly connected through fasteners.
6. The pipe connection structure of the air preheater bypass high pressure economizer of claim 4 or 5, wherein the fastening member is a fastening bolt.
7. The pipe connecting structure of the air preheater bypass high-pressure economizer of claim 1, wherein sealing structures are arranged between the first connecting flange and the second connecting flange and between the third connecting flange and the fourth connecting flange.
8. The pipe connection structure of the air preheater bypass high-pressure economizer of claim 7, wherein the sealing structure is a sealing gasket arranged between the first connecting flange and the second connecting flange and between the third connecting flange and the fourth connecting flange.
9. The pipe connection structure of the air preheater bypass high-pressure economizer of claim 1, wherein an expansion joint is provided at a middle portion of the connection sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221591935.8U CN217604147U (en) | 2022-06-24 | 2022-06-24 | Pipeline connecting structure of air preheater bypass high-pressure economizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221591935.8U CN217604147U (en) | 2022-06-24 | 2022-06-24 | Pipeline connecting structure of air preheater bypass high-pressure economizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217604147U true CN217604147U (en) | 2022-10-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221591935.8U Active CN217604147U (en) | 2022-06-24 | 2022-06-24 | Pipeline connecting structure of air preheater bypass high-pressure economizer |
Country Status (1)
| Country | Link |
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| CN (1) | CN217604147U (en) |
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2022
- 2022-06-24 CN CN202221591935.8U patent/CN217604147U/en active Active
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