CN217191941U - Hydraulic expansion head for pipe end of heat exchange pipe - Google Patents
Hydraulic expansion head for pipe end of heat exchange pipe Download PDFInfo
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- CN217191941U CN217191941U CN202123119066.7U CN202123119066U CN217191941U CN 217191941 U CN217191941 U CN 217191941U CN 202123119066 U CN202123119066 U CN 202123119066U CN 217191941 U CN217191941 U CN 217191941U
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- expansion joint
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- heat exchange
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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
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model relates to a heat exchange tube pipe end hydraulic pressure expansion joint, including the hydraulic pressure expansion joint in hole area superhigh pressure water route, set up high pressure water route water inlet at the hydraulic pressure expansion joint tail end, the first half of hydraulic pressure expansion joint is the expansion joint body, set up flutedly on the expansion joint body surface, the recess is put through with superhigh pressure water route, be equipped with the internal expanding cover in the recess, the internal expanding cover is pressed with the expansion joint body and is annotated together, the bonding section A department in internal expanding cover both sides is glued together with the pressure after the expansion joint body is annotated, internal expanding cover middle part expansion joint working section B department is in the detached state with after the expansion joint body is annotated, internal expanding cover middle part expansion joint working section B department is equipped with the delivery port in high pressure water route; the outer cover that expands is equipped with outward including the cover that expands, and the relative interior cover that expands of the cover that expands outward has bigger intensity and higher hardness, eliminates tube sheet hole tang and heat exchange tube external diameter clearance, guarantees that the welding goes on smoothly and welding quality, has improved the concentricity of tube sheet hole and heat exchange tube hole, can improve pipeline through-flow effect.
Description
Technical Field
The utility model relates to a eliminate when being applied to heat exchange tube and tube sheet butt joint welding in trades heat exchangers such as nuclear power, chemical industry radial clearance with the tube sheet tang, improve heat exchange tube and tube sheet butt joint welding quality's heat exchange tube pipe end hydraulic pressure head that expands.
Background
In the heat exchange equipment, the tube plate and the heat exchange tube are welded in a butt joint mode, and the heat exchange equipment has the advantages of high weld strength, strong weld corrosion resistance and the like. When the hole density of the tube plate is larger, the welding seam is limited by the structure and needs to adopt an inner hole rotary welding mode. When the diameter of the pipe hole is small, welding wires cannot be added in the inner hole. Therefore, the welding orifice of the tube plate is designed to be in a thin-wall inner spigot form, and the end of the heat exchange tube is inserted into the inner spigot. During welding, the thin-wall spigot metal and the pipe end metal are melted together, so that the thickness of a welding seam can be increased, and the strength of a welding seam joint is ensured.
In order to ensure that the weld metal can be completely melted through, the inner diameter of the spigot of the tube plate and the outer diameter of the end of the heat exchange tube are required to have a small fit clearance, and the clearance is preferably zero. However, because the heat exchange tube has a forming error, a roundness error is generated even when the heat exchange tube is bent, and a processing error is generated on an inner spigot of the tube plate. Due to the existence of the errors, the gap between the inner diameter of the seam joint of the tube plate spigot and the outer diameter of the end of the heat exchange tube is difficult to ensure, so that the seam joint of the tube plate spigot can not be completely melted, and the unqualified seam is caused.
If after the end of the heat exchange tube is inserted into the inner spigot of the tube plate, the end of the heat exchange tube is expanded and jointed to the spigot of the tube plate, so that the gap between the spigot and the end of the heat exchange tube is eliminated, and the thin-wall spigot metal of the tube plate at the welding joint is completely melted during welding, thereby ensuring the quality of welding seams.
The hydraulic expansion joint mode is widely applied to the pipe end expansion joint of a heat exchanger through pipe, but for a butt joint, because a gap exists between the end face of a spigot of a pipe plate and the end face of a heat exchange pipe, when the expansion joint is carried out by adopting a common hydraulic expansion joint mode, a cylindrical rubber sleeve of the hydraulic expansion joint can be extruded into the gap between the end face of the spigot of the pipe plate and the end face of the heat exchange pipe under the action of ultrahigh pressure, so that the axial positioning of the heat exchange pipe can be damaged, and the rubber sleeve can also be cracked. Therefore, in order to apply the hydraulic expansion joint to the butt joint, it is necessary to study an expansion joint having a suitable structure.
The traditional hydraulic expansion joint only consists of an expansion joint body and a layer of expansion sleeve, and when the expansion sleeve expands and deforms under the action of ultrahigh pressure water, two ends of the expansion sleeve must be reliably sealed, so that the material only needs to adopt rubber with low hardness and good elasticity. The expansion joint has good expansion effect when being applied to a heat exchange tube with a through tube type structure.
However, when a circular seam is formed in the middle of the heat exchange tube to be expanded, the expansion section of the expansion sleeve can extrude the expansion section rubber of the expansion sleeve into the circular seam under the action of ultrahigh pressure water, so that the orifice end face of the heat exchange tube is separated from the orifice end face of the tube plate, and the expansion sleeve is further burst.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the not enough of existence among the prior art and provide one kind and can carry out the heat exchange tube pipe end hydraulic pressure head that the butt joint heat exchange tube expanded joint, the hydraulic pressure expanded joint mode is by superhigh pressure water pressure with the bloated of confined cylindrical rubber sleeve, outwards produces even extrusion force to the heat exchange tube inner wall to the heat exchange tube diameter that will penetrate the tube sheet hole expands and pastes tight tube sheet pore wall, can not destroy the axial positioning of heat exchange tube, can not lead to the rubber sleeve to break.
The purpose of the utility model is realized like this:
a hydraulic expansion head for the end of a heat exchange tube comprises a hydraulic expansion joint with an ultrahigh pressure waterway in an inner hole, wherein a high pressure waterway water inlet is arranged at the tail end of the hydraulic expansion joint, the ultrahigh pressure waterway of the hydraulic expansion joint is communicated with an ultrahigh pressure water source through the high pressure waterway water inlet, the front half part of the hydraulic expansion joint is an expansion joint body, a groove is arranged on the outer surface of the expansion joint body, the groove is communicated with an ultrahigh pressure water circuit of a hydraulic expansion joint, an inner expansion sleeve is arranged in the groove, the inner expansion sleeve and an expansion joint body are pressed and injected together, the bonding sections A at the two sides of the inner expansion sleeve are bonded with the expansion joint body after being pressed and injected to form sealing, the middle expansion joint working section B of the inner expansion sleeve is separated from the expansion joint body after being pressed and injected, a water outlet of the high pressure water circuit is arranged at the middle expansion joint working section B of the inner expansion sleeve, and when ultrahigh pressure water enters, the expansion sleeve generates expansion deformation and is an expansion joint working section; the outer layer of the inner expansion sleeve is provided with an outer expansion sleeve which is pressed and injected with the expansion joint body and the inner expansion sleeve, and the outer expansion sleeve has higher strength and higher hardness relative to the inner expansion sleeve.
The material of the outer expansion sleeve is high-strength nylon with high strength and hardness, the material of the inner expansion sleeve is rubber with low hardness and good elasticity, and the material of the expansion joint body is stainless steel.
The hydraulic expansion joint is provided with ultrahigh water pressure by a hydraulic expansion joint machine, is connected with a hydraulic expansion joint gun through a high-pressure hose, and is connected with the expansion joint gun through threads.
The utility model discloses have following positive effect:
the traditional hydraulic expansion joint only consists of an expansion joint body and an expansion sleeve, and when the expansion sleeve expands and deforms under the action of ultrahigh pressure water, two ends of the expansion sleeve must be reliably sealed, so that the material only can adopt rubber with low hardness and good elasticity. The expansion joint has good expansion joint effect when being applied to a heat exchange tube with a through tube structure. However, when a circular seam is formed in the middle of the heat exchange tube to be expanded, the expansion section of the expansion sleeve can extrude the expansion section rubber of the expansion sleeve into the circular seam under the action of ultrahigh pressure water, so that the end face of the orifice of the heat exchange tube is separated from the end face of the orifice of the tube plate, and the expansion sleeve is further burst.
The utility model relates to an eliminate when being applied to heat exchange tube and tube sheet butt joint welding in trades heat exchangers such as nuclear power, chemical industry radial clearance with the tube sheet tang, improve heat exchange tube and tube sheet butt joint welding quality's expand tube joint. The utility model discloses a hydraulic pressure expands and has connect two advantages: 1. eliminate tube sheet hole tang and heat exchange tube external diameter clearance, guarantee that the welding goes on smoothly and welding quality: 2. the concentricity of the tube plate hole and the heat exchange tube hole is improved, and the through-flow effect of the pipeline can be improved.
Drawings
Fig. 1 is a schematic structural view of a butt weld between a tube plate and a heat exchange tube of a heat exchanger.
Fig. 2 is a schematic view of the tube sheet orifice configuration of the fig. a heat exchanger.
Fig. 3 is a partial enlarged schematic view of the heat exchanger tube plate and the heat exchange tube pair in the eccentric state.
Fig. 4 is a cross-sectional view of the present invention.
Fig. 5 is an operation diagram of the present invention.
In the figure, 1 is a heat exchanger, 2 is a tube plate, 3 is a heat exchange tube, 4 is a hydraulic expansion joint, 5 is an expansion joint body, 6 is an inner expansion sleeve, and 7 is an outer expansion sleeve.
Detailed Description
As shown in fig. 4 and 5, the utility model discloses a heat exchange tube end hydraulic expansion head, which comprises a hydraulic expansion joint 4 with an ultrahigh pressure water path in an inner hole, a high pressure water path water inlet is arranged at the tail end of the hydraulic expansion joint 4, the ultrahigh pressure water path of the hydraulic expansion joint 4 is communicated with an ultrahigh pressure water source through the high pressure water path water inlet, the first half part of the hydraulic expansion joint 4 is an expansion joint body 5, a groove is arranged on the outer surface of the expansion joint body 5 and is communicated with the ultrahigh pressure water path of the hydraulic expansion joint 4, an inner expansion sleeve 6 is arranged in the groove, the inner expansion sleeve 6 and the expansion joint body 5 are pressed and injected together, bonding sections A at two sides of the inner expansion sleeve 6 are bonded with the expansion joint body 5 to form a seal, a middle expansion joint working section B of the inner expansion sleeve 6 is in a separated state after being pressed and injected with the expansion joint body 5, a high pressure water path water outlet is arranged at the middle expansion joint working section B of the inner expansion sleeve 6, when ultrahigh pressure water enters, expansion deformation is generated, and the expansion joint working section is formed; the outer layer of the inner expansion sleeve 6 is provided with an outer expansion sleeve 7 which is pressed and injected with the expansion joint body 5 and the inner expansion sleeve 6, and the outer expansion sleeve 7 has higher strength and higher hardness relative to the inner expansion sleeve 6.
As shown in fig. 4, the expansion joint body 5 is made of stainless steel, the inner expansion sleeve 6 is made of rubber, and the expansion joint body is low in hardness and good in elasticity. The inner expansion sleeve 6 and the expansion joint body 5 are pressed and injected together, and the inner expansion sleeve 6 and the expansion joint body 5 at the position A are bonded together after being pressed and injected, so that the sealing effect is realized; and the inner expansion sleeve 6 and the expansion joint body 5 at the position B are in a separated state after being injected with pressure, and generate expansion deformation after ultrahigh pressure water enters, so that an expansion joint working section is formed. The outer expansion sleeve 7 is made of high-strength nylon, is pressed and injected with the expansion joint body 5 and the inner expansion sleeve 6 together, and has higher strength, higher hardness and better elasticity relative to the inner expansion sleeve 6. The outer expansion sleeve 7 is made of high-strength nylon with high strength and hardness, the inner expansion sleeve 6 is made of rubber with low hardness and high elasticity, and the expansion joint body 5 is made of stainless steel. The hydraulic expansion joint is provided with ultrahigh water pressure by a hydraulic expansion joint machine, is connected with a hydraulic expansion joint gun through a high-pressure hose, and is connected with the expansion joint gun through a thread 4.
As shown in fig. 1, 2, 3, 4 and 5, a method for performing expansion joint by using the tube end hydraulic expansion head of the heat exchange tube comprises the following steps:
step 1), firstly inserting a heat exchange tube 3 into a spigot of a tube plate 2 to enable an orifice end face of the heat exchange tube to be attached to an orifice end face of the tube plate, then inserting a hydraulic expansion joint 4 from the other end of the orifice of the tube plate, and enabling an attachment surface of the tube plate 2 and the heat exchange tube 3 to be positioned in the middle of an expansion joint working section B of the hydraulic expansion joint 4 after insertion; at the moment, one part of the expansion joint working section B of the hydraulic expansion joint 4 is arranged in the hole of the tube plate 2, and the other part of the expansion joint working section B is arranged in the tube hole of the heat exchange tube 3;
step 2), starting the hydraulic expansion joint machine, operating the hydraulic expansion joint gun, enabling ultrahigh water pressure to enter the hydraulic expansion joint 4 through an inner hole of the hydraulic expansion joint 4, enabling an expansion joint working section B of the inner expansion sleeve 6 to expand outwards uniformly under the action of the water pressure, and applying outwards radial pressure to the outer expansion sleeve 7 to generate expansion; in the hole of the tube plate 2, the outer expansion sleeve 7 is attached to the inner wall of the hole of the tube plate after being expanded; in the pipe end hole of the heat exchange pipe 3, the outer expansion sleeve 7 generates outward radial pressure on the end part of the heat exchange pipe 3, and the diameter of the end part of the heat exchange pipe 3 is increased to be attached to the inner diameter of a spigot of the pipe plate 2 due to the thin wall of the heat exchange pipe 3;
and 3) operating the hydraulic expansion joint gun to release pressure, wherein the inner expansion sleeve 6 rebounds and retracts under the action of elastic force, the outer expansion sleeve 7 rebounds and retracts under the action of elastic force, and the heat exchange tube 3 is still tightly attached to the orifice spigot of the tube plate 2 due to permanent plastic deformation generated under the action of strong expansion force, so that the expansion joint purpose is achieved.
The hydraulic expansion joint is provided with ultrahigh water pressure by a hydraulic expansion joint machine, is connected with a hydraulic expansion joint gun through a high-pressure hose, and is connected with the expansion joint gun through a thread 4. Because the outer expansion sleeve 7 is made of nylon material with relatively high hardness, the outer expansion sleeve cannot be extruded into a gap between the end faces of the butt orifices of the tube plate 2 and the heat exchange tube 3 under the pressure action of the inner expansion sleeve 6 to cause the expansion sleeve to break, the end faces of the butt orifices of the tube plate 2 and the heat exchange tube 3 cannot be separated, the positioning is damaged, and the expansion joint requirement is ensured. Because the inner expansion sleeve 6 and the outer expansion sleeve 7 both have better elasticity, the original size is recovered after pressure relief, smooth insertion and extraction from a tube plate hole and a heat exchange tube hole are ensured, and the hydraulic expansion joint 4 can be repeatedly used. The expansion joint body 5 is made of stainless steel, the inner expansion sleeve 6 is made of rubber, and the expansion joint body is low in hardness and good in elasticity. The inner expansion sleeve 6 and the expansion joint body 5 are pressed and injected together, and the inner expansion sleeve 6 and the expansion joint body 5 at the position A are bonded together after being pressed and injected, so that the sealing effect is realized; the inner expansion sleeve 6 and the expansion joint body 5 at the position B are in a separated state after being injected with pressure, and when ultrahigh pressure water enters, expansion deformation is generated to form an expansion joint working section. The outer expansion sleeve 7 is made of high-strength nylon, is pressed and injected with the expansion joint body 5 and the inner expansion sleeve 6 together, and has higher strength, higher hardness and better elasticity relative to the inner expansion sleeve 6.
When the expansion joint works, when ultrahigh pressure water is introduced, because the A positions at the two ends of the inner expansion sleeve 6 are bonded and sealed with the expansion joint body, the expansion section at the middle part of the inner expansion sleeve 6 forms a closed space, the expansion is generated under the action of the water pressure, the diameter is enlarged, outward radial pressure is generated on the inner wall of the outer expansion sleeve 7, the expansion deformation diameter of the outer expansion sleeve 7 is enlarged, outward radial extrusion is performed on the pipe end part of the heat exchange pipe butted with the orifice of the pipe plate, the pipe end part is plastically deformed, and the inner spigot of the orifice of the pipe plate is tightly attached, so that the purpose of eliminating the gap between the outer diameter of the pipe end of the heat exchange pipe and the inner diameter of the spigot of the pipe plate is achieved. Because the outer expansion sleeve 7 has higher strength and hardness, although annular seams exist between the orifices of the tube plate and the ends of the heat exchange tubes. When the large radial force of the inner expansion sleeve 6 is applied, the whole radial expansion is only generated, and the outer expansion sleeve 7 cannot be extruded into the circular seam, so that the outer expansion sleeve 7 is broken, and the smooth expansion joint is ensured.
Claims (3)
1. A hydraulic expansion head at the end of a heat exchange tube comprises a hydraulic expansion joint (4) with an ultrahigh pressure water path in an inner hole,
the method is characterized in that: the tail end of the hydraulic expansion joint (4) is provided with a high-pressure waterway water inlet, the ultrahigh-pressure waterway of the hydraulic expansion joint (4) is communicated with an ultrahigh-pressure water source through the high-pressure waterway water inlet, the front half part of the hydraulic expansion joint (4) is an expansion joint body (5), the outer surface of the expansion joint body (5) is provided with a groove, the groove is communicated with the ultrahigh-pressure waterway of the hydraulic expansion joint (4), an inner expansion sleeve (6) is arranged in the groove, the inner expansion sleeve (6) and the expansion joint body (5) are injected together by pressure, bonding sections A at two sides of the inner expansion sleeve (6) are bonded with the expansion joint body (5) after injection to form sealing, a middle expansion working section B of the inner expansion sleeve (6) is in a separated state after injection with the expansion joint body (5), a middle expansion working section B of the inner expansion sleeve (6) is provided with a high-pressure waterway water outlet, and when ultrahigh-pressure water enters the ultrahigh-pressure expansion joint body to deform, is an expansion joint working section; the outer layer of the inner expansion sleeve (6) is provided with an outer expansion sleeve (7) which is pressed and injected with the expansion joint body (5) and the inner expansion sleeve (6).
2. The tube end hydraulic expansion head of a heat exchange tube according to claim 1, characterized in that: the material of the outer expansion sleeve (7) is nylon, the material of the inner expansion sleeve (6) is elastic rubber, and the material of the expansion joint body (5) is stainless steel.
3. The tube end hydraulic expansion head of a heat exchange tube according to claim 1, characterized in that: the hydraulic expansion joint is provided with ultrahigh water pressure by a hydraulic expansion joint machine, is connected with a hydraulic expansion joint gun through a high-pressure hose, and a hydraulic expansion joint (4) is connected to the expansion joint gun through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123119066.7U CN217191941U (en) | 2021-12-13 | 2021-12-13 | Hydraulic expansion head for pipe end of heat exchange pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123119066.7U CN217191941U (en) | 2021-12-13 | 2021-12-13 | Hydraulic expansion head for pipe end of heat exchange pipe |
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| Publication Number | Publication Date |
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| CN217191941U true CN217191941U (en) | 2022-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123119066.7U Active CN217191941U (en) | 2021-12-13 | 2021-12-13 | Hydraulic expansion head for pipe end of heat exchange pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114178389A (en) * | 2021-12-13 | 2022-03-15 | 开封空分集团有限公司 | Hydraulic expansion head for pipe end of heat exchange pipe and expansion connection method |
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2021
- 2021-12-13 CN CN202123119066.7U patent/CN217191941U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114178389A (en) * | 2021-12-13 | 2022-03-15 | 开封空分集团有限公司 | Hydraulic expansion head for pipe end of heat exchange pipe and expansion connection method |
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