Tubular heat exchanger

Abstract

The utility model discloses a tube type heat exchanger which comprises a heat exchange tube and a tube plate, stepped holes are evenly distributed in the tube plate, the head end of the heat exchange tube is a stepped shaft section, the stepped shaft section is inserted into the stepped holes, and after the step position of the stepped shaft section abuts against the step end face of the stepped holes, the stepped shaft section is inserted into the stepped holes. The outer end faces of the heat exchange tubes are flush with the outer end faces of the tube plates. A conical groove is formed in the joint of the stepped hole and the outer end face of the tube plate; welding extends from the root of the conical groove to the outer end face of the tube plate, positioning can be achieved through the shape, position and size, the end face of the assembled heat exchange tube is flush with the end face of the tube plate, and fluid can flow in and out more smoothly.

Description

TECHNICAL FIELD

[0001] The utility model belongs to heat exchanger technical field, concretely relates to a tubular heat exchanger. BACKGROUND

[0002] Tubular heat exchanger is the most widely used heat exchanger in chemical industry and alcohol production. It is mainly composed of shell, tube sheet, heat exchange tube, head, baffle, etc. The required materials can be made of ordinary carbon steel, red copper or stainless steel. When heat exchange is carried out, one fluid enters from the connecting pipe of the head, flows in the tube, and flows out from the outlet pipe of the other end of the head, which is called tube side; the other fluid enters from the connecting pipe of the shell and flows out from the other connecting pipe on the shell, which is called shell side. The traditional tubular heat exchanger often has a plurality of installation holes with a slightly larger inner diameter than the diameter of the heat exchange tube on the tube sheet, the heat exchange tube is directly inserted through the installation hole, and the end of the heat exchange tube is long at the outer end surface of the tube sheet, then the part of the heat exchange tube near the tube sheet is annularly welded, so that the heat exchange tube is sealed and fixedly connected with the tube sheet. This assembly method needs to measure the length of the cross section of the heat exchange tube and the tube sheet each time, which is relatively cumbersome. And because the head end of the heat exchange tube is long, it often causes the liquid to produce a baffle when entering the heat exchange tube, reducing the flow rate. SUMMARY

[0003] The utility model aims at providing a tubular heat exchanger, which aims to solve the connection problem of the heat exchange tube and the tube sheet in the background art.

[0004] To solve the above technical problems, the utility model aims at realizing as follows:

[0005] A tubular heat exchanger, comprising a heat exchange tube and a tube sheet, wherein the tube sheet is uniformly provided with a stepped hole, the head end of the heat exchange tube is a stepped shaft section, the stepped shaft section is inserted into the stepped hole, after the stepped end of the stepped shaft section abuts against the stepped end surface of the stepped hole, the outer end surface of the heat exchange tube is flush with the outer end surface of the tube sheet; a tapered groove is formed at the connection between the stepped hole and the outer end surface of the tube sheet; and welding extends from the root of the tapered groove to the outer end surface of the tube sheet.

[0006] On the basis of the above scheme and as a preferred scheme of the above scheme: the stepped shaft section of the heat exchange tube is formed by turning.

[0007] On the basis of the above scheme and as a preferred scheme of the above scheme: the distance between the stepped end of the stepped shaft section and the outer end surface of the heat exchange tube is 5-15 mm; and the distance between the stepped end surface of the stepped hole and the outer end surface of the tube sheet is less than the distance between the stepped end of the stepped shaft section and the outer end surface of the heat exchange tube.

[0008] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects: the present invention provides a stepped shaft at the head end of the heat exchange tube and a corresponding stepped hole on the tube sheet. When the stepped shaft is inserted into the stepped hole, the step of the stepped shaft section abuts against the step end face of the stepped hole, and the outer end face of the heat exchange tube is flush with the outer end face of the tube sheet. Such a structure does not require measurement of the heat exchange tube. It only needs to abut the heat exchange tube against the tube sheet after assembly, and positioning can be achieved through shape and position dimensions. After assembly, the end face of the heat exchange tube is flush with the end face of the tube sheet, and the fluid enters and exits more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0010] Figure 2 This is the main view of the overall structure of the utility model;

[0011] Figure 3 yes Figure 2 Cross-sectional view at AA in the middle;

[0012] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0013] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the given embodiments, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0014] In the description of this application, it should be understood that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0015] See Figures 1-4As shown, the application discloses a column tube heat exchanger, which comprises heat exchange tubes 10 and a tube plate 20, the tube plate 20 is uniformly provided with stepped holes 21, the head end of the heat exchange tube 10 is a stepped shaft section, the stepped shaft section is inserted into the stepped hole 21, after the stepped end surface 211 of the stepped hole 21 is abutted by the stepped position 111 of the stepped shaft section, the outer end surface 10a of the heat exchange tube 10 is flush with the outer end surface 20a of the tube plate 20; and a tapered groove 22 is arranged at the joint of the stepped hole 21 and the outer end surface 20a of the tube plate 20; and the welding extends from the root of the tapered groove 22 to the outer end surface 20a of the tube plate 20. Specifically, the stepped shaft section of the heat exchange tube 10 is preferably formed by turning in the embodiment. That is, the heat exchange tube cut to a fixed length is clamped on a lathe, and the head end part is turned to make the head end part smaller than the rear end by 0.5mm-0.6mm, the turning amount of the thickness does not affect the strength of the heat exchange tube 10, and the stepped shaft can be formed, the stepped hole of the tube plate is processed by milling, and after the processing of the stepped hole is completed, the reverse surface is re-clamped and positioned, the joint of the stepped hole and the end surface of the tube plate is milled, and the tapered groove 22 is processed, so that the head end of the heat exchange tube can be fully exposed to the tube plate, and the welding can be fully welded during the welding process. In addition, the tapered groove 22 can form a molten pool, that is, the molten welding material is effectively formed and filled by means of the tapered groove 22; after the welding is completed and cooled, the excess welding material at the tapered groove 22 can be polished flat. Thus, the application sets the stepped shaft at the head end of the heat exchange tube, sets the corresponding stepped hole on the tube plate, and when the stepped shaft is inserted into the stepped hole, the stepped end surface of the stepped hole is abutted by the stepped position of the stepped shaft section, and the outer end surface of the heat exchange tube is flush with the outer end surface of the tube plate, so that the heat exchange tube does not need to be measured, and the heat exchange tube and the tube plate are only needed to be abutted after assembly, and positioning can be realized by the shape and size, and the end surface of the heat exchange tube is flush with the end surface of the tube plate after assembly, so that the fluid inlet and outlet are more smooth

[0016] Further, the distance between the stepped position 111 of the stepped shaft section and the outer end surface 10a of the heat exchange tube 10 is preferably 5-15mm in the embodiment, and the distance between the stepped end surface 211 of the stepped hole 21 and the outer end surface 20a of the tube plate 20 is smaller than the distance between the stepped position 111 of the stepped shaft section and the outer end surface 10a of the heat exchange tube 10. In this way, while ensuring the cooperation of the stepped shaft and the stepped hole, the length of the stepped shaft can be reduced as much as possible, and the influence on the strength of the heat exchange tube can be effectively controlled.

[0017] The above embodiment is only a preferred embodiment of the application, and does not limit the protection scope of the application, so that: equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A shell-and-tube heat exchanger comprising heat exchange tubes (10) and a tube sheet (20), characterized in that: The tube plate (20) is uniformly provided with a stepped hole (21), the head end of the heat exchange tube (10) is a stepped shaft section, the stepped shaft section is inserted into the stepped hole (21), after the stepped end (111) of the stepped shaft section abuts against the stepped end surface (211) of the stepped hole (21), the outer end surface (10a) of the heat exchange tube (10) is flush with the outer end surface (20a) of the tube plate (20); and a tapered groove (22) is arranged at the joint of the stepped hole (21) and the outer end surface (20a) of the tube plate (20); and welding is performed from the root of the tapered groove (22) to the outer end surface (20a) of the tube plate (20).

2. A shell-and-tube heat exchanger according to claim 1, characterized in that: The stepped shaft section of the heat exchange tube (10) is formed by turning.

3. A shell-and-tube heat exchanger according to claim 1, characterized in that: The distance between the stepped end (111) of the stepped shaft section and the outer end surface (10a) of the heat exchange tube (10) is 5-15 mm; and the distance between the stepped end surface (211) of the stepped hole (21) and the outer end surface (20a) of the tube plate (20) is less than the distance between the stepped end (111) of the stepped shaft section and the outer end surface (10a) of the heat exchange tube (10).

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