Sealing structure of shell and tube graphite heat exchanger

Abstract

The utility model relates to the technical field of heat exchanger sealing, in particular to a tube nest graphite heat exchanger sealing structure which comprises two tube plates which are symmetrically arranged, a plurality of heat exchange tubes are fixedly arranged between the two tube plates in a penetrating mode, and a plurality of O-shaped sealing rings matched with the heat exchange tubes are fixedly arranged in the tube plates. The O-shaped sealing rings are tightly attached to the outer surfaces of the heat exchange tubes, limiting plates are fixedly arranged on the opposite sides of the two tube plates, a plurality of limiting holes matched with the heat exchange tubes are formed in the limiting plates, and the diameter of the limiting holes is smaller than the outer diameter of the heat exchange tubes. According to the utility model, the O-shaped sealing ring is arranged, so that the sealing performance and the capability of adapting to thermal expansion working conditions of the heat exchanger can be effectively improved, and the loading capacity and the corrosion resistance of the heat exchanger are well improved in a balanced manner; and by arranging the limiting plates, the situation that the heat exchange tubes slide out of the O-shaped sealing rings to cause sealing failure when sliding in the tube plate after being heated can be prevented, and the stability of the heat exchanger during working is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger sealing, and specifically discloses a tube-in-tube graphite heat exchanger sealing structure. Background Art

[0002] Graphite heat exchanger is a heat exchange equipment made of graphite as the base material. It has excellent corrosion resistance and good thermal conductivity. It is widely used in chemical, pharmaceutical, dye and food industries. Graphite heat exchangers are mainly divided into round block hole type, plate type and shell and tube type.

[0003] The structures of existing shell-and-tube graphite heat exchangers are generally divided into fixed tube sheet type and floating head type. The fixed tube sheet type cannot solve the problem of thermal expansion of the heat exchange tubes and is prone to tearing between the tube sheet and the tube head. The floating head type solves the problem of thermal expansion of the heat exchanger through a floating tube sheet, but due to the fixed connection between the heat exchange tubes and the floating tube sheet, different batches of heat exchange tubes and slight differences in the ratio of raw materials, the thermal expansion and contraction of each heat exchange tube are inconsistent, which can easily lead to the situation that a single heat exchange tube cannot be prevented from pulling off during use of the floating head shell-and-tube heat exchanger, resulting in failure of the heat exchanger. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the utility model provides a shell-and-tube graphite heat exchanger sealing structure to solve the problem that the existing shell-and-tube graphite heat exchanger easily causes the single heat exchange tube to expand, which may be damaged during long-term use, affecting the overall performance and service life of the heat exchanger.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The sealing structure of the shell-and-tube graphite heat exchanger includes a tube sheet, two of which are symmetrically arranged, a number of heat exchange tubes are fixedly arranged between the two tube sheets, a number of O-rings are fixedly arranged inside the tube sheet to match the number of heat exchange tubes, and the O-rings are tightly fitted to the outer surface of the heat exchange tube, and limit plates are fixedly arranged on the opposite sides of the two tube sheets, and a number of limit holes are opened on the limit plates to match the number of heat exchange tubes, and the diameter of the limit holes is smaller than the outer diameter of the heat exchange tube.

[0007] Furthermore, a plurality of tube holes are provided on the tube plate to match the plurality of heat exchange tubes.

[0008] Furthermore, two ends of the plurality of heat exchange tubes are fixedly disposed in corresponding tube holes on the two tube sheets.

[0009] Furthermore, a plurality of sealing grooves are provided on the inner wall of the tube hole to cooperate with the heat exchange tube.

[0010] Furthermore, the O-ring is fixedly arranged in the sealing groove.

[0011] Furthermore, the outer diameter of the O-ring is adapted to the inner diameter of the sealing groove.

[0012] Furthermore, a plurality of bolt holes 1 are arranged at intervals on the limiting plate, and a plurality of bolt holes 2 are arranged on the tube plate to match the plurality of bolt holes 1.

[0013] Furthermore, the inner threads of bolt hole 1 and bolt hole 2 are connected with fixing bolts, and the limiting plate and the tube plate are fixedly connected by the fixing bolts.

[0014] Furthermore, the diameter of the limiting hole is larger than the inner diameter of the heat exchange tube.

[0015] Furthermore, the tube sheet and the heat exchange tube are made of graphite, and the O-ring is made of rubber.

[0016] The beneficial effects of the utility model are:

[0017] The utility model can effectively improve the sealing performance of the heat exchanger and the ability to adapt to thermal expansion conditions by arranging the O-ring, so that the pressure bearing capacity and corrosion resistance of the heat exchanger are well balanced. By arranging the limit plate, the heat exchange tube can be prevented from sliding out of the O-ring when sliding in the tube sheet after being heated, resulting in sealing failure, thereby ensuring the stability of the heat exchanger during operation. The heat exchanger manufactured by the utility model has a wider range of applications and can better meet the use requirements under various temperatures and various sealing conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a schematic cross-sectional view of the utility model with the O-ring removed;

[0020] Figure 3 It is a structural schematic diagram of the tube sheet and tube holes of the utility model;

[0021] Figure 4 It is a partial structural schematic diagram of the heat exchange tube and O-ring of the utility model.

[0022] In the figure: 1. tube sheet; 2. heat exchange tube; 3. O-ring; 4. limit plate; 5. limit hole; 6. tube hole; 7. sealing groove; 8. fixing bolt. DETAILED DESCRIPTION

[0023] The utility model is described and illustrated in detail below in conjunction with the accompanying drawings.

[0024] Example 1

[0025] like Figure 1-4As shown, the sealing structure of the shell-and-tube graphite heat exchanger includes a tube sheet 1, two tube sheets 1 are symmetrically arranged, a plurality of heat exchange tubes 2 are fixedly arranged between the two tube sheets 1, a plurality of O-type sealing rings 3 are fixedly arranged in the tube sheet 1 to match the plurality of heat exchange tubes 2, the O-type sealing rings 3 are tightly fitted to the outer surface of the heat exchange tube 2, and limiting plates 4 are fixedly arranged on the opposite sides of the two tube sheets 1, and a plurality of limiting holes 5 are opened on the limiting plates 4 to match the plurality of heat exchange tubes 2, and the diameter of the limiting holes 5 is smaller than the outer diameter of the heat exchange tube 2.

[0026] By setting the O-ring 3, the sealing performance of the heat exchanger and the ability to adapt to thermal expansion conditions can be effectively improved, so that the pressure bearing capacity and corrosion resistance of the heat exchanger are well balanced. By setting the limiting plate 4, and the diameter of the limiting hole 5 is smaller than the outer diameter of the heat exchange tube 2, the heat exchange tube 2 can be prevented from sliding out of the O-ring 3 when sliding in the tube sheet 1 after being heated, resulting in sealing failure, thereby ensuring the stability of the heat exchanger during operation.

[0027] A plurality of tube holes 6 are provided on the tube sheet 1 to cooperate with the plurality of heat exchange tubes 2 .

[0028] Both ends of a plurality of heat exchange tubes 2 are fixedly disposed in corresponding tube holes 6 on two tube sheets 1 .

[0029] A plurality of sealing grooves 7 are provided on the inner wall of the tube hole 6 to match the heat exchange tube 2 .

[0030] The O-ring 3 is fixedly arranged in the sealing groove 7 .

[0031] The outer diameter of the O-ring 3 is adapted to the inner diameter of the sealing groove 7 .

[0032] Through the above arrangement, the sealing groove 7 is machined after the tube sheet 1 is impregnated, or the tube sheet 1 is impregnated after the sealing groove 7 is machined, the compression amount of the O-ring 3 is between 15-25%, the size of the sealing groove 7 is set in accordance with the O-ring 3, and after the sealing groove 7 is machined, impurities such as oil and graphite powder in the sealing groove 7 are purged.

[0033] The limiting plate 4 is provided with a plurality of bolt holes 1 at intervals, and the tube plate 1 is provided with a plurality of bolt holes 2 in coordination with the plurality of bolt holes 1.

[0034] The bolt hole 1 and the bolt hole 2 are internally threadedly connected with fixing bolts 8 , and the limiting plate 4 and the tube plate 1 are fixedly connected by the fixing bolts 8 .

[0035] The diameter of the limiting hole 5 is larger than the inner diameter of the heat exchange tube 2 .

[0036] The tube sheet 1 and the heat exchange tube 2 are both made of graphite, and the O-ring 3 is made of rubber.

[0037] The O-ring 3 made of rubber can meet most of the anti-corrosion requirements in the industry. By utilizing the compressibility of the O-ring 3, the O-ring 3 is installed in the sealing groove 7 of the tube sheet 1, and then the heat exchange tube 2 is directly inserted into the O-ring 3 after being chamfered. By designing a suitable compression amount of the O-ring 3, a sealing form with a maximum pressure resistance of 1.6MPa can be achieved.

Claims

1. A sealing structure of a tube-in-tube graphite heat exchanger, comprising a tube sheet (1), characterized in that: Two tube sheets (1) are symmetrically arranged, a plurality of heat exchange tubes (2) are fixedly arranged between the two tube sheets (1), a plurality of O-type sealing rings (3) are fixedly arranged in the tube sheet (1) in cooperation with the plurality of heat exchange tubes (2), the O-type sealing rings (3) are tightly fitted on the outer surface of the heat exchange tube (2), and a limit plate (4) is fixedly arranged on the opposite sides of the two tube sheets (1), a plurality of limit holes (5) are opened on the limit plate (4) in cooperation with the plurality of heat exchange tubes (2), and the diameter of the limit hole (5) is smaller than the outer diameter of the heat exchange tube (2).

2. The sealing structure of the tube-in-tube graphite heat exchanger according to claim 1, characterized in that: A plurality of tube holes (6) are provided on the tube sheet (1) to cooperate with the plurality of heat exchange tubes (2).

3. The sealing structure of the tube-in-tube graphite heat exchanger according to claim 2, characterized in that: Both ends of a plurality of heat exchange tubes (2) are respectively fixedly arranged in corresponding tube holes (6) on two tube sheets (1).

4. The sealing structure of the tube-in-tube graphite heat exchanger according to claim 1, characterized in that: A plurality of sealing grooves (7) are provided on the inner wall of the tube hole (6) to cooperate with the heat exchange tube (2).

5. The sealing structure of the tube-in-tube graphite heat exchanger according to claim 4, characterized in that: The O-type sealing ring (3) is fixedly arranged in the sealing groove (7).

6. The sealing structure of the tube-in-tube graphite heat exchanger according to claim 5, characterized in that: The outer diameter of the O-ring (3) is adapted to the inner diameter of the sealing groove (7).

7. The sealing structure of the tube-in-tube graphite heat exchanger according to claim 1, characterized in that: The limiting plate (4) is provided with a plurality of bolt holes one at intervals, and the tube plate (1) is provided with a plurality of bolt holes two in coordination with the plurality of bolt holes one.

8. The sealing structure of the tube-in-tube graphite heat exchanger according to claim 7, characterized in that: The bolt hole 1 and the bolt hole 2 are internally threadedly connected with fixing bolts (8), and the limiting plate (4) and the tube plate (1) are fixedly connected by the fixing bolts (8).

9. The sealing structure of the tube-in-tube graphite heat exchanger according to claim 1, characterized in that: The diameter of the limiting hole (5) is larger than the inner diameter of the heat exchange tube (2).

10. The sealing structure of the tube-in-tube graphite heat exchanger according to claim 1, characterized in that: The tube sheet (1) and the heat exchange tube (2) are both made of graphite, and the O-ring (3) is made of rubber.

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