Fluorine-lined double-flow channel

Abstract

The utility model discloses a fluorine-lined double-flow channel which comprises a steel layer and a tetrafluoro lining layer, and the tetrafluoro lining layer is attached to the interior of the steel layer. The steel layer is formed by sequentially connecting and combining a connecting pipe flange, a connecting pipe, a cavity plate and a pipe box flange; the connecting pipes are arranged side by side, one end of each connecting pipe extends into the connecting pipe flange, a step part is arranged in the connecting pipe flange and is provided with a transition fillet, and a gap is formed between the fillet and each connecting pipe; the other end of the connecting pipe abuts against the cavity plate, an annular protrusion is arranged on the periphery of the end face, away from the connecting pipe end, of the cavity plate, and the annular protrusion is inserted into the pipe box flange. According to the fluorine-lined double-flow channel provided by the utility model, the problem of high cost of manufacturing the double-flow channel by using metal tantalum is solved by utilizing the design that the carbon steel is lined with PTFE, the connection strength of the PTFE lining layer and the carbon steel is high, and the fluorine-lined double-flow channel can be used under the conditions of higher positive and negative pressure, high temperature and strong corrosion.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tube box, specifically, a fluorine lining double flow tube box belongs to the technical field of anticorrosive heat exchanger. BACKGROUND

[0002] The medium of multi-stream heat exchanger is different, and the channels are independent, therefore, the tube box also needs to have multi-flow channels. The tube box of the heat exchanger needs to have strong corrosion resistance in chemical process production, and needs to have negative pressure resistance, various alkali resistance, strong acid resistance and corrosion resistance.

[0003] The double-flow tube box of the prior art under strong acid, strong alkali and other working conditions is made of metal tantalum, since the metal tantalum is a scarce metal, the price is very high, and the welding difficulty is high, so that the application range of such equipment is relatively narrow, which is not conducive to the demand of high-speed development of domestic chemical industry.

[0004] From the above, it is obvious that the prior art has inconvenience and defects in actual use, so it is necessary to improve. UTILITY MODEL CONTENTS

[0005] The utility model provides a fluorine lining double flow tube box in view of the deficiency in the background art, utilizes the design of carbon steel lining PTFE to solve the problem of high cost of double flow tube box made of metal tantalum, the PTFE lining layer has high connection strength with carbon steel, and can be used under higher positive and negative pressure, high temperature and strong corrosion conditions.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme:

[0007] A fluorine lining double flow tube box, comprising a steel layer and a tetrafluoro lining layer, the tetrafluoro lining layer is attached to the inside of the steel layer.

[0008] The steel layer is composed of a connecting pipe flange, a connecting pipe, a cavity plate and a tube box flange.

[0009] Further, the connecting pipes are arranged side by side, and one end of the connecting pipe extends into the connecting pipe flange.

[0010] Further, the connecting pipe flange is provided with a stepped portion, and the end portion of the connecting pipe and the stepped portion form a lap joint.

[0011] Further, the height of the stepped portion is greater than the thickness of the connecting pipe, and the stepped portion is provided with a transition fillet, and a gap is formed between the fillet and the connecting pipe.

[0012] Further, one end of the connecting pipe abuts against the cavity plate, and the connecting pipe and the cavity plate are in communication.

[0013] Further, the end face of the cavity plate away from the end of the connecting pipe is provided with an annular protrusion, and the annular protrusion is inserted into the inside of the tube box flange.

[0014] Further, the four fluorine lining is internally provided with a partition plate, and the four fluorine lining and the partition plate are both made of PTFE material.

[0015] Further, the four fluorine lining is internally provided with a partition plate, and the four fluorine lining and the partition plate are both made of PTFE material.

[0016] Further, the four fluorine lining is internally provided with a partition plate, and the four fluorine lining and the partition plate are both made of PTFE material.

[0017] Further, the four fluorine lining is internally provided with a partition plate, and the four fluorine lining and the partition plate are both made of PTFE material.

[0018] Compared with the prior art, the utility model has the following advantages after adopting the above technical scheme:

[0019] The pipe box in the utility model is composed of a steel layer and a four fluorine lining inside the steel layer, and solves the problem of high cost of pipe boxes made of metallic tantalum in the prior art.

[0020] The structure mode that the annular convex is inserted into the pipe box flange inside is adopted at the bending place of the four fluorine lining, the connection strength of the steel layer is enhanced and positioning is facilitated, the connection strength of the four fluorine lining and the steel layer after forming is improved, the gap for the four fluorine powder to enter is formed between the round angle and the connecting pipe, the four fluorine powder is solidified in the gap and forms the convex, and the connection strength of the four fluorine lining and the steel layer is further enhanced.

[0021] The utility model will be explained in detail in connection with the drawings and examples. DRAWINGS

[0022] Figure 1 It is the structure schematic diagram of the utility model;

[0023] Figure 2 It is Figure 1 the cross section schematic diagram of A-A place in 21-4;

[0024] Figure 3 It is the connection schematic diagram of the connecting pipe and the four fluorine lining.

[0025] In the drawing, 11-connecting pipe flange, 12-connecting pipe, 13-cavity plate, 14-pipe box flange, 15-annular convex, 16-hook groove; 21-four fluorine lining, 22-partition plate, 23-flange. CONCRETE IMPLEMENTING METHOD

[0026] In order to have more clear understanding of the technical features, purposes and effects of the utility model, the concrete implementing method of the utility model will be explained in connection with the drawings.

[0027] For example, Figures 1-3The utility model provides a kind of fluorine-lined double-flow pipe box, including steel layer and tetrafluoro lining 21, tetrafluoro lining 21 is attached in steel layer inside;Steel layer is composed of connecting pipe flange 11, connecting pipe 12, cavity plate 13 and pipe box flange 14, steel layer adopts sectional welding combination.

[0028] The connecting pipe 12 is arranged side by side, and one end of the connecting pipe 12 extends into the connecting pipe flange 11.

[0029] The connecting pipe flange 11 is provided with a stepped portion, and the end of the connecting pipe 12 overlaps the stepped portion; the height of the stepped portion is greater than the thickness of the connecting pipe 12 to ensure the connection strength.

[0030] The stepped portion is provided with a transition fillet, and a gap is formed between the fillet and the connecting pipe 12, which ensures that the tetrafluoro powder can enter the gap and form a protrusion after solidification, enhancing the adhesion between the tetrafluoro lining 21 and the steel layer.

[0031] The other end of the connecting pipe 12 abuts against the cavity plate 13, and the connecting pipe 12 is in communication with the cavity plate 13. The presence of the stepped portion in the connecting pipe flange 11 ensures the connection strength, and the connecting pipe 12 directly abuts against the cavity plate 13, reducing the welding difficulty and improving the welding efficiency.

[0032] The end face of the cavity plate 13 away from the end of the connecting pipe 12 is provided with an annular protrusion 15, and the annular protrusion 15 is inserted into the inside of the pipe box flange 14.

[0033] The connection structure between the annular protrusion 15 and the pipe box flange 14 is the same as that between the connecting pipe 12 and the connecting pipe flange 11, and the requirements are consistent.

[0034] By adopting the structure of inserting the annular protrusion 15 into the inside of the pipe box flange 14 at the bending part of the tetrafluoro lining 21, the connection strength of the steel layer is enhanced and positioning is facilitated, which is beneficial to the connection strength between the tetrafluoro lining 21 and the steel layer after forming.

[0035] The tetrafluoro lining 21 is provided with a partition plate 22 in the middle, and both the partition plate 22 and the tetrafluoro lining 21 are made of PTFE material, solving the technical difficulty of the middle partition plate 22 not being resistant to negative pressure.

[0036] The tetrafluoro lining 21 adopts a round corner transition at the variable diameter part, and the partition plate 22 and the tetrafluoro lining 21 adopt a round corner transition at the connection part, reducing stress concentration and facilitating fluid flow.

[0037] The outside of the connection part between the tetrafluoro lining 21 and the connecting pipe flange 11 and the pipe box flange 14 is provided with a flange 23.

[0038] As a preferred embodiment, the inside and end face of the steel layer are provided with a hook groove 16 matched with the tetrafluoro lining 21, which enhances the connection strength between the tetrafluoro lining 21 and the steel layer.

[0039] The specific working principle of the utility model is:

[0040] The pipe box in the utility model is composed of a steel layer and a tetrafluoro lining layer inside the steel layer, solves the problem of high cost of pipe box made of metal tantalum in the prior art; and can be used under the conditions of positive pressure, negative pressure, high temperature and strong corrosion.

[0041] Through the structure mode that the annular protrusion at the bending part of the tetrafluoro lining layer is inserted into the inside of the pipe box flange, the connection strength of the steel layer is enhanced and positioning is facilitated, which is beneficial to improving the connection strength of the tetrafluoro lining layer and the steel layer after forming; the clearance for the tetrafluoro powder to enter is formed between the round corner and the pipe, the tetrafluoro powder enters the clearance and solidifies to form a protrusion, and the connection strength of the tetrafluoro lining layer and the steel layer is further enhanced.

[0042] The above is an example of the best implementation mode of the utility model, wherein the parts not described in detail are the common knowledge of the ordinary skilled in the art. The protection scope of the utility model is subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the utility model is also within the protection scope of the utility model.

Claims

1. A fluorine-lined dual-flow pipe box, characterized by: It comprises a steel layer and a polytetrafluoroethylene lining (21), wherein the polytetrafluoroethylene lining (21) is attached to the interior of the steel layer; The steel layer is formed by sequentially connecting a pipe flange (11), a pipe (12), a cavity plate (13) and a pipe box flange (14); A step portion is provided in the pipe flange (11), and the end of the pipe (12) is overlapped with the step portion, and the height of the step portion is greater than the thickness of the pipe (12); the step portion is provided with a transition fillet, and a gap is formed between the fillet and the pipe (12); An annular protrusion (15) is provided on the periphery of the end surface of the cavity plate (13) away from the end of the pipe (12), and the annular protrusion (15) is inserted into the interior of the pipe box flange (14).

2. The fluorine-lined dual-flow pipe box according to claim 1, characterized in that: The connecting pipes (12) are arranged side by side, and one end of the connecting pipe (12) extends into the interior of the connecting pipe flange (11).

3. The fluorine-lined dual-flow pipe box according to claim 1, characterized in that: One end of the connecting pipe (12) abuts against the cavity plate (13), and the connecting pipe (12) and the cavity plate (13) are arranged in communication.

4. The fluorine-lined dual-flow pipe box according to claim 1, characterized in that: A partition plate (22) is provided in the middle of the tetrafluoroethylene lining (21), and both the partition plate (22) and the tetrafluoroethylene lining (21) are made of PTFE material.

5. The fluorine-lined dual-flow pipe box according to claim 4, characterized in that: The diameter change portion of the polytetrafluoroethylene lining (21) adopts a rounded transition; the connection portion between the partition plate (22) and the polytetrafluoroethylene lining (21) adopts a rounded transition.

6. The fluorine-lined dual-flow pipe box according to claim 1, characterized in that: The outside of the connection between the polytetrafluoroethylene lining (21), the connecting pipe flange (11) and the pipe box flange (14) is provided with a flange (23).

7. The fluorine-lined dual-flow pipe box according to claim 1, characterized in that: The interior and end surface of the steel layer are provided with hook grooves (16) that cooperate with the polytetrafluoroethylene lining (21).

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