Plug-in type grating heat exchanger

Abstract

The utility model belongs to the technical field of heat exchangers, and particularly discloses a plug-in type grating heat exchanger which comprises a heat exchanger body, and a shell pass inlet and a shell pass outlet are formed in the heat exchanger body. Tube boxes are installed at the two ends of the heat exchanger body, each tube box is provided with a tube pass inlet and a tube pass outlet, the heat exchanger body comprises tube plates, a shell, a pull rod, a pipe spacer and a grid, the two ends of the shell are fixedly connected with the tube boxes through the tube plates, one end of the pipe spacer is fixedly connected to the tube plates, and the other end of the pipe spacer is in threaded connection with the pull rod. The grating comprises a longitudinal rack, a transverse rack and a limiting plate, the longitudinal rack and the transverse rack are perpendicularly arranged in a crossed mode to form a mounting grid, through mutual insertion of tooth protrusions and tooth grooves, welding is omitted, the weight is reduced, the structural strength is high, and dislocation can be prevented; the limiting plates are arranged on the two sides of the longitudinal rack and the transverse rack. The pipe spacer and the pull rod are connected to the limiting plate, and the structural strength is high; the high finned tubes are arranged in the mounting grids, and stable support is provided for the high finned tubes.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers, and in particular relates to a plug-in grid heat exchanger. Background Art

[0002] The grid heat exchanger is a type of shell-and-tube heat exchanger. Its main feature is that the component supporting the heat exchange tube is the grid. This grid support has low resistance to the medium but still has sufficient strength to support the heat exchange tube.

[0003] The baffles of ordinary shell-and-tube heat exchangers can not only support the heat exchange tubes, but also improve the heat transfer coefficient of the medium on the shell side by adjusting the spacing and the size of the gaps of the baffles. However, the resistance of the baffles to the shell side medium is relatively large, and it is not applicable to some working conditions with strict pressure drop control requirements. Although the grid has almost no effect on the heat transfer coefficient of the shell side medium, it has very small flow resistance to the shell side medium, which is basically a few KPa or even a few tenths of a KPa for a device. Therefore, the grid heat exchanger is suitable for the process requirements of chemical plants that do not need to improve the heat transfer coefficient of the shell side medium, but require very small flow resistance of the shell side medium.

[0004] The grid heat exchangers currently used in chemical plants usually have a grid structure consisting of two steel bars in different directions superimposed in a steel ring, and the intersections are reinforced by welding. In this way, during the manufacturing process of large-diameter grid equipment, the grid will be twisted after spot welding due to welding, and the manufacturing error of large-diameter grids is difficult to control, which ultimately leads to very low overall forming quality of large-diameter grids. In addition, the grid has a certain strength to support the heat exchange tubes, but during the manufacturing process of large-diameter grid equipment, after a large number of heat exchange tubes are installed, a large number of grid welds will break, which ultimately causes the entire grid tube bundle to deform and cannot be smoothly installed into the equipment shell. Utility Model Content

[0005] In view of the problem that the overall forming quality of large-diameter grids in the prior art is very low, and a large number of grid welding points are prone to breakage after a large number of heat exchange tubes are installed, which eventually causes the entire grid tube bundle to deform and cannot be installed smoothly, a plug-in grid heat exchanger is proposed. The utility model provides the following technical solutions:

[0006] A plug-in grid heat exchanger comprises a heat exchanger body, on which a shell side inlet and a shell side outlet are provided; tube boxes are installed at both ends of the heat exchanger body, on which a tube side inlet and a tube side outlet are provided; the heat exchanger body comprises a tube sheet, a shell, a tie rod, a distance tube and a grid; the shell is fixedly connected to the tube box through the tube sheets at both ends; one end of the distance tube is fixedly connected to the tube sheet, and the other end is threadedly connected to the tie rod; the tie rod is threadedly installed on the grid; the grid comprises a longitudinal rack, a transverse rack and a limit plate; the longitudinal rack and the transverse rack are arranged perpendicularly to form an installation grid, and are plugged into each other through tooth protrusions and tooth grooves; the limit plates are arranged on both sides of the longitudinal rack and the transverse rack; the distance tube and the tie rod are connected to the limit plates; and high-fin tubes are arranged through the installation grid.

[0007] Preferably, the shell is cylindrical, and the outer rings of the longitudinal rack and the transverse rack are fixedly connected with a fixing ring.

[0008] Preferably, the pull rod is threadedly connected to the limiting plate, and a fastening nut is provided on one side of the pull rod passing through the limiting plate, and the fastening nut is threadedly connected to the pull rod.

[0009] Preferably, the tube sheets are connected to each other via a fastening assembly, which includes bolts and nuts.

[0010] Preferably, each grille is provided with more than three limiting plates, and the limiting plates are arranged at equal intervals in the circumferential direction.

[0011] Preferably, each grille is respectively provided with four limiting plates.

[0012] Preferably, there are more than two grids spaced apart and arranged in parallel.

[0013] Preferably, four grids are arranged in parallel at equal intervals.

[0014] Preferably, a support is fixedly connected to the lower side of the shell, and more than two supports are arranged at intervals.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The longitudinal rack and the transverse rack are arranged perpendicularly to form an installation grid, and the teeth are plugged into each other through the tooth protrusions and tooth grooves, so welding can be eliminated, which is beneficial to reducing the overall weight. At the same time, the structural strength is high and misalignment can be prevented; the limit plates are arranged on both sides of the longitudinal rack and the transverse rack; the distance tubes and the pull rods are connected to the limit plates, and the structural strength is high; high-fin tubes are arranged in the installation grid to provide stable support for the high-fin tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 About Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0019] Figure 3 About Figure 1 Schematic diagram of the cross-sectional structure of the middle BB;

[0020] Figure 4 It is a schematic diagram of the structure of the longitudinal rack and the transverse rack;

[0021] Figure 5 It is a structural schematic diagram of a fixing ring and a limiting plate;

[0022] In the attached drawings, 1. heat exchanger body; 11. tube sheet; 12. shell; 13. tie rod; 14. distance tube; 15. grid; 151. longitudinal rack; 152. transverse rack; 153. limit plate; 154. fixing ring; 2. tube box; 3. high-fin tube; 4. support; 5. shell side inlet; 6. shell side outlet; 7. tube side inlet; 8. tube side outlet. DETAILED DESCRIPTION

[0023] The directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only referenced to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the invention of the utility model.

[0024] like Figure 1-5 As shown, a plug-in grid heat exchanger comprises a heat exchanger body 1, on which a shell side inlet 5 and a shell side outlet 6 are arranged; a tube box 2 is installed at both ends of the heat exchanger body 1, on which a tube side inlet 7 and a tube side outlet 8 are arranged, the heat exchanger body 1 comprises a tube sheet 11, a shell 12, a tie rod 13, a distance tube 14 and a grid 15, the shell 12 is fixedly connected to the tube box 2 through the tube sheet 11 at both ends, one end of the distance tube 14 is fixedly connected to the tube sheet 11, and the other end is threadedly connected to the tie rod 13, and the tie rod 13 is threadedly installed on the grid 15, the grille 15 includes a longitudinal rack 151, a transverse rack 152 and a limit plate 153, the longitudinal rack 151 and the transverse rack 152 are arranged perpendicularly to form a mounting grid, and are plugged into each other through tooth protrusions and tooth grooves, so welding can be eliminated, which is beneficial to reducing the overall weight. At the same time, the structural strength is high and misalignment can be prevented; the limit plate 153 is arranged on both sides of the longitudinal rack 151 and the transverse rack 152; the distance tube 14 and the pull rod 13 are connected to the limit plate 153, and the structural strength is high; the high fin tube 3 is arranged in the mounting grid to provide stable support for the high fin tube 3.

[0025] Furthermore, the shell 12 is cylindrical, and the outer rings of the longitudinal rack 151 and the transverse rack 152 are fixedly connected with a fixing ring 154, and the fixing ring 154 contacts the inner wall surface of the shell 12, so the support is stable and the firmness is high.

[0026] Furthermore, the pull rod 13 is threadedly connected to the limit plate 153, and a fastening nut is provided on one side of the pull rod 13 passing through the limit plate 153. The fastening nut is threadedly connected to the pull rod 13. The span and lateral tightness between the grilles 15 can be adjusted by rotating the pull rod 13 to improve stability.

[0027] Furthermore, the tube sheets 11 are connected to each other through a fastening assembly, and the fastening assembly includes bolts and nuts, that is, through common bolts and nuts, and a flange connection is performed, which is firmly fixed and has low cost.

[0028] Furthermore, each grid 15 is provided with four limiting plates 153 , and the limiting plates 153 are arranged at equal intervals in the circumferential direction; four of the grids 15 are arranged in parallel at equal intervals, which can improve the firmness of fixing the high-fin tubes 3 .

[0029] Furthermore, a support 4 is fixedly connected to the lower side of the shell 12, and two supports 4 are arranged at intervals and symmetrically arranged on both sides with respect to the center of gravity of other upper components to provide stable support.

Claims

1. A plug-in grid heat exchanger, comprising a heat exchanger body (1), the heat exchanger body (1) being provided with a shell side inlet (5) and a shell side outlet (6); a tube box (2) being installed at both ends of the heat exchanger body (1), the tube box (2) being provided with a tube side inlet (7) and a tube side outlet (8), characterized in that: The heat exchanger body (1) comprises a tube sheet (11), a shell (12), a tie rod (13), a distance tube (14) and a grille (15). The shell (12) is fixedly connected to the tube box (2) at both ends through the tube sheet (11). One end of the distance tube (14) is fixedly connected to the tube sheet (11), and the other end is threadedly connected to the tie rod (13). The tie rod (13) is threadedly mounted on the grille (15). The grille (15) comprises a longitudinal rack (151), a transverse rack (152) and a limit plate (153). The longitudinal rack (151) and the transverse rack (152) are arranged to intersect vertically to form an installation grid, and are plugged into each other through tooth protrusions and tooth grooves. The limit plate (153) is arranged on both sides of the longitudinal rack (151) and the transverse rack (152). The distance tube (14) and the tie rod (13) are connected to the limit plate (153). A high fin tube (3) is arranged through the installation grid.

2. The plug-in grid heat exchanger according to claim 1, characterized in that: The housing (12) is cylindrical, and the outer rings of the longitudinal rack (151) and the transverse rack (152) are fixedly connected with a fixing ring (154).

3. The plug-in grid heat exchanger according to claim 1, characterized in that: The pull rod (13) is threadedly connected to the limiting plate (153), and a fastening nut is provided on one side of the pull rod (13) passing through the limiting plate (153), and the fastening nut is threadedly connected to the pull rod (13).

4. The plug-in grid heat exchanger according to claim 1, characterized in that: The tube sheets (11) are connected to each other via a fastening assembly, wherein the fastening assembly comprises bolts and nuts.

5. The plug-in grid heat exchanger according to claim 1, characterized in that: Each grille (15) is provided with more than three limit plates (153), and the limit plates (153) are arranged at equal intervals in the circumferential direction.

6. The plug-in grid heat exchanger according to claim 5, characterized in that: Each grille (15) is respectively provided with four limiting plates (153).

7. The plug-in grid heat exchanger according to claim 1, characterized in that: There are more than two grids (15) arranged in parallel and at intervals.

8. The plug-in grid heat exchanger according to claim 7, characterized in that: Four grids (15) are arranged in parallel at equal intervals.

9. The plug-in grid heat exchanger according to claim 1, characterized in that: A support (4) is fixedly connected to the lower side of the shell (12), and more than two of the supports (4) are arranged at intervals.

Images