Double-pipe heat exchanger

Abstract

The utility model relates to a double-pipe heat exchanger which comprises an inner pipe and an outer pipe, and the inner pipe comprises a plurality of inner pipe straight pipe sections arranged side by side at intervals and inner pipe bent pipe sections connected between every two corresponding adjacent inner pipe straight pipe sections. The outer pipe comprises outer pipe straight pipe sections connected to the peripheries of the corresponding inner pipe straight pipe sections in a sleeving mode and outer pipe connecting sections connected between the two corresponding adjacent outer pipe straight pipe sections, and the two adjacent outer pipe straight pipe sections are defined as the first outer pipe straight pipe section and the second outer pipe straight pipe section respectively. The outer pipe connecting section comprises a middle bent pipe section, a first connecting section connected between the middle bent pipe section and the first outer pipe straight pipe section and a second connecting section connected between the middle bent pipe section and the second outer pipe straight pipe section, and fluid enters the first connecting section along the inner direction of the first outer pipe straight pipe section at an obtuse angle; and fluid enters the straight pipe section of the second outer pipe along the inner direction of the second connecting section at an obtuse angle. The double-pipe heat exchanger provided by the utility model can reduce the deposition and blockage of materials at the connecting position of the outer pipe straight pipe section and the outer pipe connecting pipe.

Description

Technical Field

[0001] The utility model relates to a heat exchanger in the technical fields of metallurgy and chemical engineering, and particularly relates to a double-pipe heat exchanger. Background Art

[0002] The double-pipe heat exchanger is a commonly used heat exchanger in metallurgy and chemical engineering. Its specific structure is as disclosed in the Chinese patent "A detachable and efficient double-pipe heat exchanger" with the patent number CN115950282A. It includes an inner pipe and an outer pipe. The inner pipe includes a plurality of inner pipe straight pipe sections arranged in parallel at intervals, and the inner pipe also includes inner pipe elbow sections connected between corresponding adjacent two inner pipe straight pipe sections. The outer pipe includes outer pipe straight pipe sections sleeved around the corresponding inner pipe straight pipe sections, and the outer pipe also includes outer pipe connecting pipes connected between adjacent two outer pipe straight pipe sections. The outer pipe connecting pipes are perpendicular to the outer pipe straight pipe sections.

[0003] During use, the heat medium flows inside the inner pipe, and the cold medium flows in the shell layer between the outer pipe connecting pipes, the outer pipe straight pipe sections, and the inner pipe straight pipe sections, so as to achieve heat exchange. The problems existing in the existing double-pipe heat exchanger are as follows: when the shell layer material flows from one outer pipe straight pipe section to another outer pipe straight pipe section, since the outer pipe connecting pipe is perpendicular to the outer pipe straight pipe section, the flow direction of the material will change sharply by 90 degrees at the connection, resulting in a large resistance. When the material is a slurry containing solids, it is extremely easy to cause siltation or blockage. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a double-pipe heat exchanger that can reduce the siltation and blockage of the material at the connection position between the outer pipe straight pipe section and the outer pipe connecting pipe.

[0005] To solve the above technical problems, the technical solution of a double-pipe heat exchanger in the utility model is as follows:

[0006] A double-pipe heat exchanger includes an inner pipe and an outer pipe. The inner pipe includes a plurality of inner pipe straight pipe sections arranged in parallel at intervals and inner pipe elbow sections connected between corresponding adjacent two inner pipe straight pipe sections. The outer pipe includes outer pipe straight pipe sections sleeved around the corresponding inner pipe straight pipe sections and outer pipe connection sections connected between corresponding adjacent two outer pipe straight pipe sections. Define two adjacent outer pipe straight pipe sections as the first outer pipe straight pipe section and the second outer pipe straight pipe section respectively. The outer pipe connection section includes an intermediate elbow section, a first connection section connected between the intermediate elbow section and the first outer pipe straight pipe section, and a second connection section connected between the intermediate elbow section and the second outer pipe straight pipe section. The fluid enters the first connection section at an obtuse angle along the inner direction of the first outer pipe straight pipe section, and the fluid enters the second outer pipe straight pipe section at an obtuse angle along the inner direction of the second connection section.

[0007] Further, the obtuse angle is not less than 120°.

[0008] Further, the first connection section is a straight pipe or an arc-shaped pipe, and the second connection section is a straight pipe or an arc-shaped pipe.

[0009] Further, both ends of the inner pipe elbow section are detachably connected to the corresponding ends of the inner pipe straight pipe sections.

[0010] Further, erosion-resistant and wear-resistant plates with an inclination direction consistent with the corresponding connection section are provided between the outer pipe straight pipe sections and the inner pipe straight pipe sections. The erosion-resistant and wear-resistant plate in the first outer pipe straight pipe section is used to direct the fluid in the first outer pipe straight pipe section to the first connection section, and the erosion-resistant and wear-resistant plate in the second outer pipe straight pipe section is used to direct the fluid discharged from the first connection section to the downstream of the first outer pipe straight pipe section.

[0011] Further, maintenance openings are provided on each outer pipe straight pipe section at the corresponding erosion-resistant and wear-resistant plates. The maintenance openings and the first connection section are respectively arranged on the opposite sides of the first outer pipe straight pipe section; the maintenance openings and the second connection section are distributed on the opposite sides of the second outer pipe straight pipe section.

[0012] The beneficial effects of the present utility model are as follows: In the present utility model, the fluid flows from the first outer pipe straight pipe section through the outer pipe connection section to the second outer pipe straight pipe section. The outer pipe connection section does not adopt the straight pipe structure perpendicular to the outer pipe straight pipe section in the prior art. The outer pipe connection section includes an intermediate elbow section, a first connection section and a second connection section, and the whole outer pipe connection section presents an elbow structure. In this way, it is avoided that the fluid enters the outer pipe connection section at 90° from the first outer pipe straight pipe section, and it is also avoided that the fluid enters the second outer pipe straight pipe section at 90° from the outer pipe connection section, reducing the siltation and blockage of the material at the connection position between the outer pipe straight pipe section and the outer pipe connection pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] By referring to the accompanying drawings and reading the following detailed description, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become easily understandable. In the drawings, several embodiments of the present disclosure are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0014] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0015] 1. Maintenance opening; 2. Erosion-resistant and wear-resistant plate; 3. First connection section; 4. Outer pipe connection section; 5. Inner pipe straight pipe section; 6. Inner pipe elbow section; 7. Intermediate elbow section; 8. Second connection section; 9. First outer pipe straight pipe section; 10. Second outer pipe straight pipe section. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] For the convenience of understanding the present utility model, the present utility model will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. The preferred embodiments of the present utility model are given in the accompanying drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure content of the present utility model more thorough and comprehensive.

[0017] It should be noted that unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model are only for the purpose of describing specific embodiments and are not used to limit the present utility model.

[0018] An embodiment of a shell-and-tube heat exchanger in the present utility model is as Figure 1 shown: It includes an inner tube and an outer tube. The inner tube includes a plurality of inner tube straight pipe segments 5 arranged side by side at intervals in the front-rear direction, and inner tube elbow segments 6 connected between corresponding adjacent two inner tube straight pipe segments. In this embodiment, the axis of the inner tube straight pipe segment extends in the left-right direction.

[0019] The outer tube includes an outer tube straight pipe segment sleeved on the periphery of the corresponding inner tube straight pipe segment and an outer tube connection segment 4 connected between corresponding adjacent two outer tube straight pipe segments. The axis of the outer tube straight pipe segment extends in the left-right direction. The above all belong to the prior art.

[0020] Define two adjacent outer tube straight pipe segments as the first outer tube straight pipe segment 9 and the second outer tube straight pipe segment 10 respectively. The outer tube connection segment includes an intermediate elbow segment 7, a first connection segment 3 connected between the intermediate elbow segment 7 and the first outer tube straight pipe segment, and a second connection segment 8 connected between the intermediate elbow segment 7 and the second outer tube straight pipe segment 10. In this embodiment, the first connection segment, the intermediate elbow segment and the second connection segment form an elbow structure, and both the first connection segment and the second connection segment are straight pipe structures (or arc pipe structures).

[0021] The fluid enters the first connection segment at an obtuse angle along the inner direction of the first outer tube straight pipe segment, and the fluid enters the second outer tube straight pipe segment at an obtuse angle along the inner direction of the second connection segment. The obtuse angle is complementary to α as shown in Figure 1 , and the angle of α ≤ 60°. Therefore, the obtuse angle in the present utility model is not less than 120°.

[0022] In the air of this embodiment, both ends of the inner tube elbow segment 6 are detachably connected to the corresponding inner tube straight pipe segments, which is convenient for the maintenance and replacement of the inner tube elbow segment.

[0023] In this embodiment, an erosion-resistant and wear-resistant plate 2 with an inclination direction consistent with that of the corresponding connection section is arranged between the straight pipe section of the outer pipe and the straight pipe section of the inner pipe. The erosion-resistant and wear-resistant plate in the first straight pipe section of the outer pipe is used to guide the fluid in the first straight pipe section of the outer pipe to the first connection section, and the erosion-resistant and wear-resistant plate in the second straight pipe section of the outer pipe is used to guide the fluid discharged from the first connection section to the downstream of the first straight pipe section of the outer pipe. The erosion-resistant and wear-resistant plate plays a role in further preventing siltation and blockage and guiding. As Figure 1 shown, for the first straight pipe section of the outer pipe, the fluid in the outer pipe flows from left to right until it reaches the erosion-resistant and wear-resistant plate. Under the guiding action of the erosion-resistant and wear-resistant plate, the fluid enters the first connection section, and then flows through the intermediate elbow section and the second connection section to the second straight pipe section of the outer pipe. After being guided and reversed by the erosion-resistant and wear-resistant plate in the second straight pipe section of the outer pipe, it flows from right to left along the second straight pipe section of the outer pipe.

[0024] Maintenance openings 1 are arranged on each straight pipe section of the outer pipe at the corresponding erosion-resistant and wear-resistant plates. The maintenance opening 1 and the first connection section 3 are respectively arranged on the opposite sides of the first straight pipe section 9 of the outer pipe; the maintenance opening and the second connection section are distributed on the opposite sides of the second straight pipe section of the outer pipe. If materials are blocked at the erosion-resistant and wear-resistant plate and the corresponding connection section, the blocked position can be cleaned and maintained through the maintenance opening.

[0025] The utility model can avoid the problem of rapid speed change when materials flow through the inlet and outlet of the shell of the outer pipe, avoid pipeline blockage. The outer pipe connecting pipe with the erosion-resistant and wear-resistant plate and the elbow structure is beneficial to reducing the pipeline resistance of material flow; the erosion-resistant and wear-resistant plate can avoid the erosion of the inner pipe and the outer pipe by materials, and prolong the service life of the equipment; the improved shell-and-tube heat exchanger can adapt to the heat exchange of solid-containing materials.

[0026] In the above description of this specification, unless otherwise clearly specified and limited, terms such as "fixed", "installed", "connected" or "coupled" should be understood in a broad sense. For example, for the term "connected", it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components or the interaction relationship between two components. Therefore, unless otherwise clearly limited in this specification, those skilled in the art can understand the specific meanings of the above terms in the utility model according to specific situations.

[0027] Based on the above description of this specification, those skilled in the art can also understand the terms used as follows, such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise", etc. The terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of this specification. It is only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or component involved must have the specific orientation, be constructed and operate in the specific orientation. Therefore, the above terms of orientation or positional relationship cannot be understood or interpreted as a limitation to the solution of the present invention.

[0028] In addition, the terms "first" or "second" used in this specification and other terms used to refer to numbers or ordinals are only for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this specification, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise specifically defined.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A shell and tube heat exchanger, comprising an inner tube and an outer tube, wherein the inner tube comprises a plurality of inner tube straight tube sections arranged in parallel at intervals and an inner tube curved tube section connected between two corresponding adjacent inner tube straight tube sections, and the outer tube comprises an outer tube straight tube section sleeved and connected to the outer periphery of the corresponding inner tube straight tube section and an outer tube connecting section connected between two corresponding adjacent outer tube straight tube sections, characterized in that: Two adjacent outer tube straight sections are defined as a first outer tube straight section and a second outer tube straight section, the outer tube connecting section includes an intermediate curved section, a first connecting section connected between the intermediate curved section and the first outer tube straight section, and a second connecting section connected between the intermediate curved section and the second outer tube straight section, the fluid enters the first connecting section at an obtuse angle along the direction of the first outer tube straight section, and the fluid enters the second outer tube straight section at an obtuse angle along the direction of the second connecting section.

2. The double-tube heat exchanger according to claim 1, characterized in that: The obtuse angle is not less than 120°.

3. The shell and tube heat exchanger according to claim 1, characterized in that: The first connecting section is a straight tube or an arc-shaped tube, and the second connecting section is a straight tube or an arc-shaped tube.

4. The double-tube heat exchanger according to claim 1, characterized in that: The two ends of the inner pipe curved section are detachably connected to the corresponding ends of the inner pipe straight section.

5. The double-tube heat exchanger according to any one of claims 1 to 4, characterized in that: An anti-scour wear-resistant plate is arranged between the outer pipe straight section and the inner pipe straight section, and its inclination direction is consistent with the corresponding connecting section. The anti-scour wear-resistant plate in the first outer pipe straight section is used to guide the fluid in the first outer pipe straight section to the first connecting section, and the anti-scour wear-resistant plate in the second outer pipe straight section is used to guide the fluid discharged from the first connecting section to the downstream of the first outer pipe straight section.

6. The double-tube heat exchanger according to claim 5, characterized in that: An inspection port is provided on each outer pipe straight section at the corresponding anti-scour wear-resistant plate, and the inspection port and the first connecting section are arranged on opposite sides of the first outer pipe straight section; the inspection port and the second connecting section are distributed on opposite sides of the second outer pipe straight section.

Images