Metal heat exchanger with double-tube-plate structure

Abstract

The utility model relates to the technical field of heat exchanger equipment, and particularly discloses a metal heat exchanger with a double-tube-plate structure, which comprises a shell, two main tube plates are respectively arranged at two ends of the shell, a plurality of heat exchange tubes are fixedly connected between the main tube plates at the two ends, and auxiliary tube plates are arranged on the sides, far away from each other, of the two main tube plates. The ends of the heat exchange tubes penetrate through the main tube plate and then extend, the extending parts penetrate through the auxiliary tube plate, the peripheries of the heat exchange tubes penetrating through the main tube plate are sleeved with sealing rings, the sealing rings extend to be bordered with the auxiliary tube plate, and the joints of the heat exchange tubes and the main tube plate and the auxiliary tube plate are welded in a sealed mode. The auxiliary tube plate is additionally arranged on the basis of the main tube plate, a double-tube-plate structure is formed, the opening end of the heat exchange tube firstly penetrates through the main tube plate to be communicated with the auxiliary tube, the opening end of the heat exchange tube is not prone to leakage due to the partition of the main tube plate, and the sealing ring is additionally arranged, so that the sealing performance of connection between the opening of the heat exchange tube and the main tube plate and the auxiliary tube plate is further enhanced. The heat exchange tube is not prone to leakage in the using process, and the service life of the heat exchanger is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger equipment, in particular to a metal heat exchanger with a double-tube plate structure. Background Art

[0002] A tubular heat exchanger utilizes two fluids to exchange heat within the heat exchanger. One fluid, called the tube-side fluid, flows within the heat exchange tubes; the other, called the shell-side fluid, flows outside the tubes. Due to the temperature difference, the two fluids exchange heat as they flow through the heat exchanger, achieving the desired heat exchange. Existing heat exchangers have their heat exchange tubes welded to a single tube sheet at both ends. During use, residual gas and pinholes form at the welding arc, making the tube ends on the tube sheet particularly susceptible to leakage and weld cracking, shortening the heat exchanger's lifespan. Utility Model Content

[0003] The purpose of the utility model is to provide a metal heat exchanger with a double tube sheet structure to solve the problem that the heat exchange tube orifices on the existing single tube sheet are particularly prone to leakage and welding cracks, which shortens the service life of the heat exchanger.

[0004] In order to solve the above problems, the technical solutions provided are as follows:

[0005] A metal heat exchanger with a double-tube sheet structure comprises a shell, two main tube sheets are provided at each end of the shell, a plurality of heat exchange tubes are fixedly connected between the main tube sheets at the two ends, a sub-tube sheet is provided on the side of the two main tube sheets away from each other, the ends of the plurality of heat exchange tubes pass through the main tube sheets and then extend, the extended portion passes through the sub-tube sheet, a sealing ring is provided on the outer periphery of the heat exchange tubes passing through the main tube sheets, the sealing ring extends to the edge of the sub-tube sheet, and the connection between the heat exchange tubes and the main tube sheets and the sub-tube sheets is sealed and welded.

[0006] The basic principle and beneficial effect of the above technical solution are: a secondary tube sheet is added on the basis of the main tube sheet to form a double tube sheet structure. The heat exchange tube end first passes through the main tube sheet to communicate with the secondary tube. With the partition of the main tube sheet, the heat exchange tube end is not prone to leakage. In addition, a sealing ring is added to further enhance the sealing of the connection between the heat exchange tube end and the main tube sheet and the secondary tube sheet, so that the heat exchange tube will not easily leak during use, thereby extending the service life of the heat exchanger.

[0007] Furthermore, the housing is fixedly connected to a header at each end, and the ends of the multiple heat exchange tubes are connected to the inner cavity of the header. The end of one end of the header is provided with a tube-side inlet, and the end of the other end of the header is provided with a tube-side outlet. The solution to be cooled is input into the inner cavity of the header through the tube-side inlet, and the solution to be cooled is cooled while flowing into the heat exchange tubes. The cooled solution flows out of the tube-side outlet.

[0008] Furthermore, a buffer device extending into the header is provided at the tube-side inlet. The buffer device includes a bell-shaped mouth communicating with the tube-side inlet, which extends into the header. A concave surface is provided on the inside of the bell-shaped mouth, and a water outlet hole is provided within the concave surface. The bell-shaped mouth reduces the flow rate of the solution, thereby reducing the impact of the solution entering the header cavity on the heat exchange nozzles and auxiliary tube sheets, thereby protecting the heat exchange nozzles and auxiliary tube sheets. The concave surface with the water outlet hole disperses the outlet water, further reducing the impact of the solution on the heat exchange nozzles and auxiliary tube sheets, ensuring the sealing between the auxiliary tube sheets and the heat exchange nozzle ends, preventing leakage at the heat exchange nozzle ends, and further extending the service life of the heat exchanger.

[0009] Furthermore, the auxiliary tube plate is fixed to the main tube plate by welding.

[0010] Furthermore, the main tube plate has a thickness of 20-40 mm, and the auxiliary tube plate has a thickness of 10-20 mm.

[0011] Furthermore, the sealing head is fixedly connected to the end of the shell through a flange. The flange connection facilitates the removal of the sealing head from the end of the shell for inspection and cleaning of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of the metal heat exchanger of the utility model;

[0013] Figure 2 for Figure 1 A magnified schematic diagram of the structure in the middle.

[0014] The reference numerals in the drawings of the specification include: shell 1, main tube plate 2, heat exchange tube 3, auxiliary tube plate 4, sealing ring 5, head 6, tube side inlet 7, tube side outlet 8, bell mouth 9, concave surface 10, water outlet 11. DETAILED DESCRIPTION

[0015] The following is further described in detail through specific implementation methods:

[0016] The embodiment is basically as shown in the attached Figure 1-2 As shown:

[0017] A metal heat exchanger with double tube sheet structure, such as Figure 1 As shown, it includes a shell 1, and two main pipe plates 2 are respectively provided at the left and right ends of the shell 1. The two main pipe plates 2 cooperate with the inner wall of the shell 1 to form a sealed cavity in the shell 1. Multiple heat exchange tubes 3 are fixedly connected between the main pipe plates 2 at both ends. A sub-tube plate 4 is welded on the side away from each other of the two main pipe plates 2. The main pipe plate 2 is 40 mm thick, and the sub-tube plate 4 is 20 mm thick. The ends of the multiple heat exchange tubes 3 pass through the main pipe plates 2 and then extend, and the extended part passes through the sub-tube plate 4, as shown in FIG. Figure 2As shown, the heat exchange tubes 3 passing through the main tube plate 2 are sheathed with sealing rings 5, which extend to the edge of the auxiliary tube plate 4. The heat exchange tubes 3 are sealed and welded to the main tube plate 2 and the auxiliary tube plate 4 at their joints. The left and right ends of the shell 1 are fixedly connected to end caps 6 via flanges. The main tube plate 2 and the auxiliary tube plate 4 separate the inner cavity of the shell 1 from the inner cavity of the end caps 6. The ends of the multiple heat exchange tubes 3 are connected to the inner cavities of the left and right end caps 6. The end of the left end cap 6 is provided with a pipe-side inlet 7, and the end of the right end cap 6 is provided with a pipe-side outlet 8. A buffer device is provided at the end of the pipe-side inlet 7, extending into the end cap 6. The buffer device includes a bell mouth 9 connected to the pipe-side inlet 7, extending into the inner cavity of the end cap 6, and a concave surface 10 is provided on the inner side of the bell mouth 9, with a water outlet 11 provided within the concave surface 10.

[0018] The specific implementation process is as follows:

[0019] A secondary tube sheet 4 is added to the main tube sheet 2 to form a double tube sheet structure. The end of the heat exchange tube 3 first passes through the main tube sheet 2 to connect with the secondary tube. With the main tube sheet 2 as a partition, the end of the heat exchange tube 3 is less likely to leak. In addition, a sealing ring 5 is added to further enhance the sealing between the end of the heat exchange tube 3 and the main tube sheet 2 and the secondary tube sheet 4, so that the heat exchange tube 3 will not easily leak during use, extending the service life of the heat exchanger. The bell mouth 9 of the buffer device can reduce the flow rate of the solution, reducing the impact of the solution entering the inner cavity of the head 6 on the end of the heat exchange tube 3 and the secondary tube sheet 4, thereby protecting the heat exchange tube 3 and the secondary tube sheet 4. The concave surface 10 with the water outlet hole 11 can disperse the outlet water, further reducing the impact of the solution on the end of the heat exchange tube 3 and the secondary tube sheet 4, ensuring the sealing between the secondary tube sheet 4 and the end of the heat exchange tube 3, preventing leakage at the end of the heat exchange tube 3, and further extending the service life of the heat exchanger.

[0020] The above is only an embodiment of the present invention, and the commonly known specific structures and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A metal heat exchanger with a double tube sheet structure, comprising a shell, two main tube sheets provided at each end of the shell, and a plurality of heat exchange tubes fixedly connected between the main tube sheets at the two ends, characterized in that: A secondary tube plate is provided on one side of the two main tube plates away from each other. The ends of multiple heat exchange tubes pass through the main tube plate and then extend. The extended parts pass through the secondary tube plate. A sealing ring is provided on the outer periphery of the heat exchange tube passing through the main tube plate. The sealing ring extends to the edge of the secondary tube plate. The connection between the heat exchange tube and the main tube plate and the secondary tube plate is sealed and welded.

2. The metal heat exchanger with a double tube sheet structure according to claim 1, characterized in that: The two ends of the shell are respectively fixedly connected with a head, and the ends of multiple heat exchange tubes are connected to the inner cavity of the head. The end of the other end of the head is provided with a tube side inlet, and the end of one end of the head is provided with a tube side outlet.

3. The metal heat exchanger with a double tube sheet structure according to claim 2, characterized in that: The pipe inlet end is provided with a buffer device extending into the head. The buffer device includes a bell mouth connected to the pipe inlet, the bell mouth extends into the head, the inner side of the bell mouth is provided with a concave surface, and the concave surface is provided with a water outlet.

4. The metal heat exchanger with a double tube sheet structure according to claim 3, characterized in that: The auxiliary tube plate is fixed to the main tube plate by welding.

5. The metal heat exchanger with a double tube sheet structure according to claim 4, characterized in that: The thickness of the main tube plate is 20-40 mm, and the thickness of the auxiliary tube plate is 10-20 mm.

6. The metal heat exchanger with a double tube sheet structure according to claim 5, characterized in that: The head is fixedly connected to the end of the shell through a flange.

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