CN111284813A - An enamel built-in coil tube liner - Google Patents

Abstract

The invention relates to an enamel built-in coil tube inner tube, which comprises an inner tube body, the top end of the inner tube is provided with an inner tube upper sealing head, the bottom end is provided with an inner tube lower sealing head, and a coil tube is installed in the inner tube tube. , both ends of the coil tube are fixed on the upper sealing head of the inner bladder, and extend out of the upper sealing head of the inner bladder, and the lower sealing head of the inner bladder is a convex ellipsoid surface. In the enamel built-in coil tube liner provided by the present invention, by setting the lower head of the inner liner to be a convex ellipsoid, when the lower head of the inner liner is subjected to external pressure, the ellipsoid surface will have an outward supporting force to prevent the edge of the ellipsoid. deformation, thereby improving the qualification rate of the enamel built-in coil.

Description

An enamel built-in coil tube liner

technical field

The invention belongs to the technical field of inner liner, and in particular relates to an enamel built-in coil tube inner liner.

Background technique

Referring to Figure 1, the enamel built-in coiled tube liner on the market now includes an inner liner barrel 3, the top of the inner liner barrel is provided with an inner liner upper seal 4, the bottom end is provided with an liner lower seal 5, and the inner liner barrel is provided with an inner liner upper seal 4. A coil tube 2 is installed in the body, and both ends of the coil tube are fixed on the upper sealing head of the inner bladder and extend out of the upper sealing head of the inner bladder. The enamel built-in coil liner of this structure has the following technical problems:

Under the action of high-temperature enamel, the edge of the lower head of the inner tank is easily deformed by external pressure, so that the pass rate of the enamel built-in coil is significantly reduced.

SUMMARY OF THE INVENTION

In view of the problems existing in the above-mentioned prior art, the present invention provides an enamel built-in coil tube liner that solves the above-mentioned technical problems.

In order to realize the above-mentioned purpose of the invention, a technical scheme provided by the present invention is as follows:

An enamel built-in coil tube inner tube comprises an inner tube cylinder body, the top end of the inner tube cylinder body is provided with an inner tube upper sealing head, the bottom end is provided with an inner tube lower sealing head, a coil tube is installed in the inner tube tube, and the coil tube The two ends of the liner are fixed on the upper sealing head of the inner pot, and the upper sealing head of the inner pot is extended, and the lower sealing head of the inner pot is a convex ellipsoid surface.

Preferably, it also includes a lower cover of the inner tank, the lower cover of the inner tank bulges inwardly to form an inwardly convex ellipsoid surface, the bottom of the lower head of the inner tank is provided with an opening, and the lower cover of the inner tank is clamped In the opening, interference fit with the lower sealing head of the inner pot, and the lower sealing cover of the inner pot is welded on the lower sealing head of the inner pot to form a seal with the lower sealing head of the inner pot.

Preferably, the lower head of the inner bladder is integrated with the inner bladder cylinder.

Preferably, the bottom end of the lower cover of the inner container is horizontal and located lower than the bottom end of the lower sealing head of the inner container.

Preferably, the upper sealing head of the inner container is a convex ellipsoid.

In the enamel built-in coil tube liner provided by the present invention, by setting the lower head of the inner liner to be a convex ellipsoid, when the lower head of the inner liner is subjected to external pressure, the ellipsoid surface will have an outward supporting force to prevent the edge of the ellipsoid. deformation, thereby improving the qualification rate of the enamel built-in coil.

Another technical solution provided by the present invention is as follows: an enamel built-in coiled tube liner, comprising an inner liner cylinder, the top of the inner liner is provided with an inner liner upper head, the bottom end is provided with an inner liner lower head, and the inner liner is provided with an inner liner. A coiled tube is installed in the bile cylinder, two ends of the coiled tube are fixed on the upper sealing head of the inner bladder, and extend out of the upper sealing head of the inner bladder, and the lower sealing head of the inner bladder is a convex spherical surface.

Preferably, it also includes a lower cover of the inner tank, the lower cover of the inner tank bulges inwardly to form an inwardly convex spherical surface, the bottom of the lower head of the inner tank is provided with an opening, and the lower cover of the inner tank is clamped on the bottom of the inner tank. The opening is in interference fit with the lower sealing head of the inner pot, and the lower sealing cover of the inner pot is welded on the lower sealing head of the inner pot to form a seal with the lower sealing head of the inner pot.

Preferably, the lower head of the inner bladder is integrated with the inner bladder cylinder.

Preferably, the bottom end of the lower cover of the inner container is horizontal and located lower than the bottom end of the lower sealing head of the inner container.

Preferably, the upper sealing head of the inner container is a convex spherical shape.

The enamel built-in coiled tube liner provided by the present invention, by setting the lower head of the inner liner to be a convex spherical surface, when the lower head of the inner liner is subjected to external pressure, the spherical surface will have an outward supporting force to prevent its edge from deforming, Thus, the qualification rate of the enamel built-in coil is improved.

Description of drawings

1 is a perspective view of an existing enamel built-in coiled tube liner;

Fig. 2 is the perspective view of a kind of enamel built-in coil tube liner provided by the present invention;

Reference numerals in the figure; coil 2, inner tank cylinder 3, inner tank upper head 4, inner tank lower head 5, inner tank lower cover 6.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Embodiment 1, the present invention provides an enamel built-in coiled tube liner, referring to FIG. 2, comprising an inner liner cylinder 3, the top end of the inner liner cylinder is provided with an inner liner upper sealing head 4, and the bottom end is provided with an inner liner lower part. Head 5, a coiled tube 2 is installed in the inner bladder, both ends of the coiled tube are fixed on the upper sealing head of the inner bladder, and extend out of the upper sealing head of the inner bladder, and the lower sealing head of the inner bladder is a convex ellipsoid surface , as a preferred solution, the ellipsoid surface is an ellipsoid surface intercepted by ellipsoids with radii a, b, c along the plane where a and b are located, where a:b:c=2.5:1:1.

In the enamel built-in coil tube liner provided by the present invention, by setting the lower head of the inner liner to be a convex ellipsoid, when the lower head of the inner liner is subjected to external pressure, the ellipsoid surface will have an outward supporting force to prevent the edge of the ellipsoid. deformation, thereby improving the qualification rate of the enamel built-in coil.

In actual use, during the heating process of the coil, the liquid in the inner tube is heated and expanded, which increases the pressure on the lower head of the inner tube, so that the lower head of the inner tube is easy to bulge out and deform, which will affect the built-in enamel over time. The service life of the coiled tube liner, for this reason, the applicant has also made the following design, referring to FIG. 1, the enamel built-in coiled tube liner also includes an inner liner lower cover 6, and the inner liner lower cover protrudes inwards An inner convex ellipsoid surface is formed, the bottom of the lower head of the inner pot is provided with an opening (not marked in the figure), and the lower cover of the inner pot is stuck in the opening and the lower head of the inner pot is interfering with the lower head of the inner pot and the lower cover of the inner pot is welded on the lower head of the inner pot to form a seal with the lower head of the inner pot. During production, the lower head of the inner tank can be installed and then welded, and finally the inner tank of the built-in coil tube is enamelled. In this structure, the lower cover of the inner tank and the lower head of the inner tank are used together. When the lower head of the inner tank is subjected to external pressure, the convex ellipsoid surface of the lower head of the inner tank will have an outward supporting force to prevent its edge. Deformation, when the lower cover of the liner is under internal pressure, the convex ellipsoid surface of the lower cover of the liner will have an inward supporting force to prevent it from being deformed, especially when the lower cover of the liner and the lower head of the liner will be deformed. After the interference fit is welded, the effect of supporting each other and preventing the deformation of the lower head of the inner tank is better. After testing, the structure can withstand the ultra-high pressure of more than 1.6MPa, and does not deform under high temperature sintering at 900 °C. The pass rate is relatively high. A 13% improvement over the existing structure.

As a preferred embodiment, the lower sealing head of the inner bladder is integrated with the inner bladder cylinder.

In the present application, the bottom end of the lower cover of the inner container is preferably horizontal and positioned lower than the bottom end of the lower cover of the inner container. In this way, the inner liner of the enamel inner coil is easy to be placed stably, and when the inner convex ellipsoid surface of the lower cover of the inner liner is under pressure, the bottom end of the lower cover of the inner liner will also receive a reaction force to prevent the inner liner from falling down. The cover is deformed, thereby sharing a part of the force of the lower head of the inner tank, which is beneficial to the protection of the lower head of the inner tank.

In the present application, the upper end of the inner container is preferably a convex ellipsoid surface, and the reason is the same as the design principle of the lower end of the inner container, which will not be repeated here.

Example 2, the main difference between Example 2 and Example 1 is that the lower head of the inner tank is a convex spherical surface. Specifically, the present invention provides an enamel built-in coil inner tank, including an inner tank cylinder. The top end of the inner bladder is provided with an inner bladder upper head, the bottom end is provided with an inner bladder lower head, a coiled tube is installed in the inner bladder cylinder, and both ends of the coiled tube are fixed on the inner bladder upper head, and extend The upper sealing head of the inner pot is out, and the lower sealing head of the inner pot is a convex spherical surface.

The enamel built-in coiled tube liner provided by the present invention, by setting the lower head of the inner liner to be a convex spherical surface, when the lower head of the inner liner is subjected to external pressure, the spherical surface will have an outward supporting force to prevent its edge from deforming, Thus, the qualification rate of the enamel built-in coil is improved.

In actual use, during the heating process of the coil, the liquid in the inner tube is heated and expanded, which increases the pressure on the lower head of the inner tube, so that the lower head of the inner tube is easy to bulge out and deform, which will affect the built-in enamel over time. The service life of the coiled tube liner, for this reason, the applicant has also made the following design, referring to FIG. 1, the enamel built-in coiled tube liner also includes an inner liner lower cover 6, and the inner liner lower cover protrudes inwards An inner convex spherical surface is formed, an opening (not shown in the figure) is provided at the bottom of the lower head of the inner pot, and the lower cover of the inner pot is clamped in the opening and the lower head of the inner pot is an interference fit , and the lower cover of the inner pot is welded on the lower head of the inner pot to form a seal with the lower head of the inner pot. During production, the lower head of the inner tank can be installed and then welded, and finally the inner tank of the built-in coil tube is enamelled. In this structure, the lower cover of the inner tank and the lower head of the inner tank are used together. When the lower head of the inner tank is subjected to external pressure, the convex spherical surface of the lower head of the inner tank will have an outward supporting force to prevent its edge from deforming. , When the lower cover of the inner tank is under internal pressure, the convex spherical surface of the lower cover of the inner tank will have an inward supporting force to prevent its deformation, especially the interference between the lower cover of the inner tank and the lower head of the inner tank After matching and then welding, the two support each other to prevent the deformation of the lower head of the inner tank, and the effect is better.

As a preferred embodiment, the lower sealing head of the inner bladder is integrated with the inner bladder cylinder.

In the present application, the bottom end of the lower cover of the inner container is preferably horizontal and positioned lower than the bottom end of the lower cover of the inner container. In this way, the inner liner of the enamel inner coil is easy to be placed stably, and when the inner convex spherical surface of the lower cover of the inner liner is under pressure, the bottom end of the lower cover of the inner liner will also receive a reaction force to prevent the lower sealing of the inner liner. The cover is deformed, thereby sharing a part of the force of the lower head of the inner tank, which is beneficial to the protection of the lower head of the inner tank.

In the present application, the upper head of the inner pot is preferably a convex spherical shape, and the reason is the same as the design principle of the lower head of the inner pot, which will not be repeated here.

The following is the manufacturing method of the enamel built-in coil tube liner of the present invention, and its technological process is: 1, raw material shearing board → 2, cylinder body 3 rounding → 3, cylinder body 3 straight seam welding → 4, welding pipe seat → 5 , Combination welding of the upper head of the inner tank 4→6, installation of the coil 2 and welding with the pipe seat of the enamel inner tank→7, welding of the inner wall of the inner tank coil support rod→8, combined welding of the lower head of the inner tank 5→9 , Degreasing the enamel liner → 10, sandblasting the inner wall and coil of the enamel liner → 11, enamel coating → 12, drying → 13, enamel sintering → 14, combined welding liner lower cover 6.

Specifically:

1. Raw material shearing: the plate cutting error is ±0.15mm.

2. Cylinder body 3 rolls: roll opening degree ≤2.0mm, axial misalignment <1.5mm, coaxiality error ±0.35mm, cylinder straightness error <0.2mm after rolling; this kind of rolling accuracy can only Ensure that the inner tank is not deformed in the axial direction at high temperature during the enamel sintering process.

3. Cylinder body 3 straight seam welding: using plasma welding process, using φ1.0mm welding wire, welding shielding argon flow control range "18 ~ 20L/min", ion shielding gas flow "2.8 ~ 3.3L/min", welding current It is 161A, the welding speed is 405mm/min, and the welding wire adding speed is 43cm/min. Such equipment operating parameters can ensure the quality of plasma straight seam welding, and can also meet the overall enamel requirements of the inner tank.

4. Welding pipe sockets: welding of cold and hot water interface sockets, temperature probe sockets, sewage pipe sockets, etc. on the enamel liner.

5. Combined welding of the upper head 4 of the inner tank: the combined welding of the upper head 4 of the inner tank and the inner tank body 3 adopts the carbon dioxide gas shielded welding process, the welding current is 206A, the welding speed is 823mm/min, and the welding angle is 375° .

6. Install the coil 2 and weld it with the upper head 4 of the enamel liner: As shown in Figure 2, the circulation port of the coil 2 and the two ports on the upper head 4 of the inner tank are welded after installation, generally Two ports are provided with tube seats, and the circulation port of the coil tube 2 is connected to the upper head of the inner tank by welding with the tube seat. After the circulation port of the coil tube 2 is installed with the two ports on the upper head 4 of the inner tank, Both the inner and outer walls will be welded, welding current: 202A±5A, welding torch rotation angle 397±9°, welding voltage 20V±2V, welding torch speed 2.3-3.2 rpm, welding wire diameter φ1.0, welding torch and barrel are 45± 3°.

7. Welding of the support rod of the coil tube on the inner wall of the inner tube: the support rod on the coil tube 2 is welded to the inner wall of the inner tube, and the support rod is welded on the inner wall of the inner tube to ensure the firmness and stability of the coil tube 2 and the inner tube after welding. It is also to ensure the stability of the enamel process after the coil 2 and the inner tank are combined and welded. The welding parameters of this process: the angle between the welding torch and the welding surface is 61±3°, the welding current is 191A±5A, and the welding voltage is 20V±2V.

8. Combined welding of the lower head 5 of the inner tank: After the welding and fixing of the coil 2 is completed, this process is the combined welding of the lower head 5 of the inner tank and the inner tank body. The welding adopts the carbon dioxide gas shielded welding process, the welding current is 206A, and the welding The speed is 823mm/min and the welding angle is 375°. As of this process, the semi-finished product of the inner tank without enamel has been completed, and the next step is to enter the enamel process stage.

9. Degreasing the enamel liner: The degreasing process is to carry out surface treatment on the combined welded semi-finished liner, and use a high temperature baking process of 206°±9° to remove the oil and impurities on the surface of the semi-finished liner.

10. Sandblasting the inner wall of the enamel liner and the coil pipe: The sandblasting process is to use special steel shot (diameter φ1.0) on the enamel surface of the semi-finished liner to continuously impact it, so that the roughness of the enamel surface can reach Ra≥2.8. The surface sandblasting of the enamel surface is to ensure that when the next enamel is applied, the enamel can be effectively adsorbed on the enamel surface of the inner tank. The sandblasted steel shot is a process of technological operation on the enamel surface in the semi-finished product inner tank through a high-pressure inflatable device. The device requires that the air pressure during sandblasting should be greater than 0.65MPa, and the travel speed of the spray gun during the spraying process is 11.5mm. /s, the distance between the spray gun and the spray surface is 52mm±3mm.

11. Enamel coating:

① Soak the porcelain powder and water in the stainless steel cylinder in proportion (1:0.35), when soaking, add water first, then add the porcelain powder, the soaking time is controlled between 4-24 hours, and different enamel powders are never allowed to mix use.

② Mix the soaked glaze slurry evenly, sieve it with a 25-40 mesh screen, and use a special inspection piece (1 square decimeter) to weigh for inspection: first weigh and peel the inspection piece, and then immerse the inspection piece vertically into the material. In the bucket, soak it for three times repeatedly. After taking out the excess glaze slurry, the weight of the glaze slurry adsorbed on the test piece is weighed to be 9-23g/square decimeter.

③ Weigh and peel the 100ml standard test weight bottle, fill up the glaze slurry with the adjusted adsorption capacity, weigh it, record the weight, and control the test weight between 180-200g.

④ Fill 1 Bayer glaze slurry, pour it into the Bayer sieve through the funnel, rinse the glaze slurry in the Bayer sieve with clean water until the water flowing out is clear water, read the scale of the remaining porcelain powder as the particle size, and the porcelain powder particle size is controlled at 9- 13 grids.

⑤Check the surface of the workpiece to ensure that there are no rust spots, welding flashes, sharp corners, burrs and other defects affecting the enamel; at the same time, check the inner tank and

If there is any residual steel grit in the tube seat, the steel grit needs to be cleaned before entering the enamelling process.

⑥Paste textured paper on the outer thread of the joint on the inner tank to protect the thread from contact with the glaze slurry.

⑦ Move the sandblasted qualified inner tank to the enamel coating machine and fix it to ensure that the inner tank does not fall off during the enamel coating process, inject an appropriate amount of enamel glaze slurry according to the size of the inner tank; set the speed and angle, and start the enamel coating After the enamel is finished, the inner tank is hung vertically and the excess glaze slurry is thrown away.

⑧The feature of this process is that the inner tank and coil 2 are enamel-coated as a whole, and the process parameters are very strict.

12. Drying: This process is to bake the enamel-coated liner in a high temperature furnace of 206℃±9℃. This process is to ensure that the enamel-coated enamel is completely absorbed on the enamel surface of the inner liner, and at the same time ensure The thickness of the enamel layer is controlled at 0.35mm.

13. Enamel sintering: This process is the molding process of the enamel surface of the enamel inner tank. The sintering temperature of the enamel inner tank in the high temperature furnace is 836±5℃, and the sintering time of the enamel inner tank in the furnace is 867±10 seconds. After the enamel liner comes out of the furnace, the inner liner should be cooled by blowing air cooling device, and the blowing air temperature should be controlled at 19±3℃. In this way, the enamel inner tank and coil tube can withstand strong impact force.

14. Combine and weld the lower cover 6 of the inner tank: as shown in Figure 2, the lower cover 6 of the inner tank is combined with the lower head 5 of the inner tank in the enamel inner tank that has been enamelled. The convex surface is installed in the inner tank, and the lower head 5 of the inner tank and the lower cover 6 of the inner tank are interference fit. The inner convex enamel surfaces are closely attached together and then welded. This matching welding process can ensure that the water in the inner tank will not penetrate into the welding seam area and ensure the service life of the inner tank. In addition, the inner tank of the structure of FIG. 1 is enamel before the lower head 5 is installed. After the inner tank of this structure is installed with the lower head 5 of the inner tank, the lower head 5 of the inner tank is installed into the inner tank of the structure of FIG. 1. Afterwards, a large supporting force will be generated to force the deformed liner into a standard circle. Under the action of this huge external force, the welding part of the coil 2 installed in the inner liner and the upper head 4 of the inner liner will be welded together. The enamel layer will crack. If the inner tank with the structure of Fig. 1 is deformed greatly under the condition of high temperature enamel, when the lower head 5 of the inner tank is installed, the enamel layer on the inner wall of the inner tank will have an overall cracking phenomenon. The inner pot with the structure of Fig. 2 can completely change this process defect. The inner pot with the structure of Fig. 2 has the lower head 5 of the inner pot convexly arranged and welded with the inner pot 1 as a whole for integral enamelling. The outer convex standard ellipse of the lower head 5 of the inner tank of the head 4 is welded to the whole of the inner tank cylinder 3, and these three parts are processed into an inseparable part with high strength and ensure no deformation under high temperature sintering at 900 ° C; Figure 2 Structure If the inner tank is not deformed, the lower cover 6 of the inner tank is installed, and the enamel inner tank and the coil tube 2 and their welding parts will not be cracked and the overall cracking phenomenon will not occur.

In this application, the outer, inner, top, bottom, etc. refer to the use state of the inner liner of the enamel-covered built-in coil tube.

The above-mentioned embodiments only represent the embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (10)

1. An enamel built-in coiled tube inner liner, comprising an inner liner cylinder (3), the top end of the inner liner cylinder is provided with an inner liner upper sealing head (4), and the bottom end is provided with an inner liner lower sealing head (5), A coiled tube (2) is installed in the inner bladder, both ends of the coiled tube are fixed on the upper sealing head of the inner bladder, and extend out of the upper sealing head of the inner bladder, and it is characterized in that, The lower sealing head of the inner container is an outwardly convex ellipsoid. 2. An enamel built-in coiled tube liner according to claim 1, characterized in that it further comprises a lower cover (6) of the liner, and the lower cover of the liner protrudes inwardly to form an inner convex ellipsoid surface , the bottom of the inner tank lower head is provided with an opening, the inner tank lower cover is stuck in the opening and the inner tank lower head is in an interference fit, and the inner tank lower cover is welded to the inner tank. A seal is formed on the lower sealing head of the inner pot and the lower sealing head of the inner pot. 3 . The enamel built-in coiled tube liner according to claim 2 , wherein the lower head of the inner liner is integrated with the inner liner cylinder. 4 . 4. An enamel built-in coiled tube liner according to claim 2, wherein the bottom end of the lower cover of the inner liner is horizontal, and the position is lower than the bottom end of the lower cover of the inner liner . 5 . The enamel built-in coiled tube liner according to claim 1 , wherein the upper head of the liner is a convex ellipsoid. 6 . 6. An enamel inner liner with built-in coil tube, comprising an inner liner barrel, the top end of the inner liner barrel is provided with an inner liner upper sealing head, the bottom end is provided with an inner liner lower sealing head, and a coil tube is installed in the inner liner barrel, Both ends of the coiled tube are fixed on the upper sealing head of the inner bladder, and extend out of the upper sealing head of the inner bladder, which is characterized in that: The lower sealing head of the inner liner is a convex spherical surface. 7 . The enamel built-in coiled tube liner according to claim 6 , further comprising a lower cover of the liner, the lower cover of the liner bulges inward to form an inner convex spherical surface, and the inner liner is convex. 8 . The bottom of the lower sealing head of the inner pot is provided with an opening, the lower sealing cover of the inner pot is clamped in the opening, and the lower sealing head of the inner pot is in an interference fit, and the lower sealing cover of the inner pot is welded to the bottom of the inner pot. The upper sealing head forms a seal with the lower sealing head of the inner liner. 8 . The enamel built-in coiled tube liner according to claim 7 , wherein the lower sealing head of the inner liner is integrated with the inner liner cylinder. 9 . 9 . The enamel built-in coiled tube liner according to claim 7 , wherein the bottom end of the lower cover of the inner liner is horizontal, and the position is lower than the bottom end of the lower cover of the inner liner. 10 . . 10 . The enamel built-in coil tube liner according to claim 6 , wherein the upper head of the liner is a convex spherical shape. 11 .

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