Welded shell and tube plate structure

Abstract

The utility model discloses a welded shell tube plate structure which comprises a cylinder, a fixed flange plate and a copper tube plate, the fixed flange plate is welded and fixed on the cylinder, the copper tube plate abuts against the outer side of the fixed flange plate, and a rubber sealing ring is further placed between the copper tube plate and the fixed flange plate. The fixing flange plate, the copper pipe plate and the rubber sealing ring are relatively fixed through bolts, a heat transfer pipe is placed in the barrel, pipe holes are distributed in the copper pipe plate, the two ends of each pipe hole are an original port and a throttling hole end respectively, and the original port and the throttling hole end are welded and fixed to the pipe holes respectively. An air pipe end cover assembly and a liquid pipe end cover assembly are further welded to the outer side of the copper pipe plate. The utility model has the characteristics that the structure is simple, firm and reliable, the leakage of refrigerant is prevented, and the maintenance and replacement of parts in the installation and subsequent use process are more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to a welded shell-tube-tube-sheet structure. Background Art

[0002] At present, the connections between the shell and tube, tube sheet and heat transfer tube used in the heat pump industry are mostly expansion joints, and adhesives are applied to the expansion joints to achieve a sealing effect. However, in actual use, leakage is prone to occur at the expansion joints, resulting in refrigerant outflow and the unit cannot operate normally. In addition, the tube sheet is welded to the cylinder, which is not conducive to later internal maintenance and cleaning work. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a welded shell-tube-tube-sheet structure, which has a simple structure, is firm and reliable, prevents refrigerant leakage, and is more convenient for installation and maintenance and replacement of parts during subsequent use.

[0004] In order to solve the above problems, the utility model adopts the following technical solutions:

[0005] A welded shell-tube-tube sheet structure comprises a cylinder, a fixed flange and a copper tube sheet, wherein the fixed flange is welded and fixed to the cylinder, the copper tube sheet is close to the outside of the fixed flange, and a rubber sealing ring is placed between the copper tube sheet and the fixed flange, the fixed flange, the copper tube sheet and the rubber sealing ring are relatively fixed by bolts, a heat transfer tube is placed on the cylinder, tube holes are distributed on the copper tube sheet, the two ends of the tube hole are respectively an original port and a throttling hole end, the original port and the throttling hole end are respectively welded and fixed to the tube hole, and an air pipe end cover assembly and a liquid pipe end cover assembly are also welded to the outside of the copper tube sheet.

[0006] A further technical solution is that at least two limiting steps are distributed on the copper tube plate, and the gas pipe end cover assembly and the liquid pipe end cover assembly are welded and fixed on the edge side of the limiting step on the copper tube plate, and a confluence cavity is formed between the copper tube plate and the limiting step, and the confluence cavity is used to gather all the heat transfer tubes.

[0007] A further technical solution is that four limiting steps are distributed on the copper tube plate, and the air pipe end cover assembly and the liquid pipe end cover assembly are each provided with a pair. A pair of air pipe end cover assemblies are welded to the upper end of the copper tube plate, and a pair of liquid pipe end cover assemblies are welded to the lower end. The four limiting steps are used to weld the air pipe end cover assembly and the liquid pipe end cover assembly to form a confluence cavity.

[0008] A further technical solution is that the trachea end cover assembly includes a fan-shaped end cover and a connecting pipe, the fan-shaped end cover is provided with drawing holes, one end of the connecting pipe is welded and fixed to the drawing holes on the fan-shaped end cover, and the liquid pipe end cover assembly has the same structure as the trachea end cover assembly, the difference being that the inner diameter of the connecting pipe on the trachea end cover assembly is larger than the inner diameter of the connecting pipe on the liquid pipe end cover assembly.

[0009] A further technical solution is that the four limit steps distributed on the copper tube plate and the fan-shaped end cover on the air pipe end cover assembly are all fan-shaped structures, which are used for welding with the limit steps. Similarly, the fan-shaped end cover on the liquid pipe end cover assembly is also welded and fixed with the limit steps.

[0010] A further technical solution is that the heat transfer tube is a "U"-shaped structure, the shape of the entire heat transfer tube is like a long U, the inside of the heat transfer tube is an internal thread or a smooth tube wall, and a high-temperature and high-pressure refrigerant flows through the heat transfer tube.

[0011] The beneficial effects of the utility model are as follows: the utility model is a welded shell and tube plate structure, in which the heat transfer tube and the copper tube plate are connected by welding, which is more reliable and firm than the traditional expansion connection, and the risk of leakage at the connection is lower, so as to ensure the normal operation of the unit; the copper tube plate, the rubber sealing gasket and the fixed flange are connected by high-strength bolts. The advantage of bolt fixing is that when the inside of the cylinder is dirty and needs maintenance and cleaning, it is only necessary to unscrew the high-strength bolts on the fixed flange to disassemble it, which greatly reduces labor intensity and saves time and effort; the throttling hole end on the heat transfer tube is integrated with the heat transfer tube, and can be completed without excessive installation and processing, saving additional processing and assembly costs while also meeting the effect of refrigerant throttling. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 This is a structural schematic diagram of a welded shell-tube-tube-sheet structure of the utility model;

[0014] Figure 2 It is a three-dimensional diagram of a copper tube sheet in a welded shell-tube-tube sheet structure of the utility model;

[0015] Figure 3 It is a rear view of a copper tube sheet in a welded shell-tube-tube sheet structure of the utility model;

[0016] Figure 4It is a schematic diagram of a gas pipe end cover assembly in a welded shell-tube-tube-sheet structure of the utility model;

[0017] Figure 5 It is a schematic diagram of a heat transfer tube in a welded shell-tube-tube-sheet structure of the utility model;

[0018] Figure 6 For this utility model Figure 5 A is an enlarged schematic diagram.

[0019] Figure 1-6 In: 1-gas pipe end cover assembly, 2-liquid pipe end cover assembly, 3-copper tube plate, 4-rubber sealing ring, 5-heat transfer tube, 6-fixed flange, 7-cylinder, 11-connecting pipe, 12-fan-shaped end cover, 13-drawing hole, 14-edge, 31-limiting step, 32-converging cavity, 33-tube hole, 51-throttling hole end, 52-original port. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0021] See also Figures 1 to 6 As shown, a welded shell-tube-tube sheet structure comprises a cylinder 7, a fixed flange 6 and a copper tube sheet 3. The fixed flange 6 is welded and fixed on the cylinder 7. The copper tube sheet 3 is close to the outside of the fixed flange 6, and a rubber sealing ring 4 is placed between the copper tube sheet 3 and the fixed flange 6. The fixed flange 6, the copper tube sheet 3 and the rubber sealing ring 4 are relatively fixed by bolts (not shown). A heat transfer tube 5 is placed on the cylinder 7. Tube holes 33 are distributed on the copper tube sheet 3. The two ends of the tube hole 33 are respectively an original port 52 and a throttling hole end 51. The original port 52 and the throttling hole end 51 are respectively welded and fixed to the tube hole 33. An air pipe end cover assembly 1 and a liquid pipe end cover assembly 2 are also welded to the outside of the copper tube sheet 3.

[0022] At least two limiting steps 31 are also distributed on the copper tube sheet 3. The air pipe end cover assembly 1 and the liquid pipe end cover assembly 2 are welded and fixed on the edge side of the limiting step 31 on the copper tube sheet 3. A confluence cavity 32 is formed between the copper tube sheet 3 and the limiting step 31. The confluence cavity 32 is used to collect all the heat transfer tubes 5. Four limiting steps 31 are distributed on the copper tube sheet 3. The air pipe end cover assembly 1 and the liquid pipe end cover assembly 2 are each provided with a pair. A pair of air pipe end cover assemblies 1 are welded on the upper end of the copper tube sheet 3, and a pair of liquid pipe end cover assemblies 2 are welded on the lower end. The confluence cavity 32 is formed by welding the air pipe end cover assembly 1 and the liquid pipe end cover assembly 2 through the four limiting steps 31. The air pipe end cover assembly 1 includes a fan-shaped end cover 12 and a connecting pipe 11. The fan-shaped end cover 12 is provided with drawing holes 13. One end of the connecting pipe 11 is welded and fixed to the drawing hole 13 on the fan-shaped end cover 12. The liquid pipe end cover assembly 2 is also the same structure as the air pipe end cover assembly 1, except that the inner diameter of the connecting pipe 11 on the air pipe end cover assembly 1 is larger than the inner diameter of the connecting pipe 11 on the liquid pipe end cover assembly 2. The four limiting steps 31 distributed on the copper tube plate 3 and the fan-shaped end cover 12 on the air pipe end cover assembly 1 are all fan-shaped structures, which are used for welding with the limiting steps 31. Similarly, the fan-shaped end cover 12 on the liquid pipe end cover assembly 2 is also welded and fixed with the limiting steps 31. The heat transfer tube 5 is a "U"-shaped structure. The shape of the entire heat transfer tube 5 is like a long U. The interior of the heat transfer tube 5 is internally threaded or has a smooth tube wall. High-temperature and high-pressure refrigerant will flow through the heat transfer tube 5.

[0023] In this embodiment, the heat transfer tube 5 is inserted into the tube hole 33 of the copper tube plate 3, and the heat transfer tube 5 is connected to the copper tube plate 3 by welding; the air pipe end cover assembly 1 and the liquid pipe end cover assembly 2 are clamped on the limiting step 31 on the copper tube plate 3, and then the edge 14 of the fan-shaped end cover 12 is welded to the edge of the limiting step 31 of the copper tube plate 3 by welding; and the connecting pipe 11 on the air pipe end cover assembly 1 and the liquid pipe end cover assembly 2 is first inserted into the drawing hole 13, and then connected by welding, and the fixed flange 6, the copper tube plate 3 and the rubber sealing ring 4 are relatively fixed by bolts (not shown).

[0024] Since the heat transfer tube 5 and the copper tube plate 3 are connected by welding, it is more reliable and firm than the traditional expansion joint connection, and the risk of leakage at the connection is lower, so as to ensure the normal operation of the unit; the copper tube plate 3, the rubber sealing gasket 4, and the fixed flange 6 are connected by high-strength bolts, while the traditional connection is welding. The advantage of bolt fixing is that when the inside of the cylinder 7 is dirty and needs maintenance and cleaning, it only needs to unscrew the high-strength bolts on the fixed flange 6 to disassemble it, while the traditional method requires cutting with a cutting machine, which greatly increases the labor intensity and is time-consuming and labor-intensive.

[0025] Traditional throttling hole ends are mostly external, that is, they are two separate parts from the heat transfer tube 5, which are difficult to process and install and have high costs. The throttling hole end 51 on this heat transfer tube 5 is integrated with the heat transfer tube 5. It only needs to shrink the original port 52 to a small hole of 1.2mm-2mm to become the throttling hole end 51. It can be completed without excessive installation and processing, saving additional processing and assembly costs while also achieving the effect of refrigerant throttling.

[0026] The inside of the cylinder 7 is a water flow channel, so the water pressure is not high when the unit is running, and it can be sealed with a rubber sealing pad 4 with a thickness of 2mm-5mm. High-temperature and high-pressure refrigerant will flow through the confluence cavity 32 in the copper tube plate 3 and the heat transfer tube 5, so the sealing requirement is very high. The copper tube plate 3 and the heat transfer tube 5 are connected by welding, with high strength, which can far meet the sealing requirements. The copper tube plate 3 is made of 2mm-5mm copper plate through a mold, and then drilled and stretched to the shape of the tube hole 33 by a hole drawing machine.

[0027] The above embodiment is only an example of the present invention and is not intended to limit the implementation and scope of rights of the present invention. Any technical solution that is identical or equivalent to the content described in the claims of the present invention should be included in the protection scope of the present invention.

Claims

1. A welded shell-tube-tube sheet structure, comprising a cylinder, a fixed flange and a copper tube sheet, characterized in that: The fixed flange is welded and fixed on the cylinder, the copper tube sheet is close to the outside of the fixed flange, and a rubber sealing ring is placed between the copper tube sheet and the fixed flange. The fixed flange, the copper tube sheet and the rubber sealing ring are relatively fixed by bolts. A heat transfer tube is placed on the cylinder, and tube holes are distributed on the copper tube sheet. The two ends of the tube hole are respectively an original port and a throttling hole end. The original port and the throttling hole end are respectively welded and fixed to the tube hole. An air pipe end cover assembly and a liquid pipe end cover assembly are also welded to the outside of the copper tube sheet.

2. A welded shell-tube-tube-sheet structure according to claim 1, characterized in that: At least two limiting steps are also distributed on the copper tube plate, and the gas pipe end cover assembly and the liquid pipe end cover assembly are welded and fixed on the edge side of the limiting step of the copper tube plate, and a confluence cavity is formed between the copper tube plate and the limiting step.

3. A welded shell-tube-tube-sheet structure according to claim 2, characterized in that: The copper tube plate is provided with four limiting steps, and each of the air pipe end cover assembly and the liquid pipe end cover assembly is provided with a pair. A pair of air pipe end cover assemblies are welded to the upper end of the copper tube plate, and a pair of liquid pipe end cover assemblies are welded to the lower end.

4. A welded shell-tube-tube-sheet structure according to claim 3, characterized in that: The trachea end cover assembly comprises a fan-shaped end cover and a connecting pipe. Drawing holes are distributed on the fan-shaped end cover, and one end of the connecting pipe is welded and fixed to the drawing hole on the fan-shaped end cover.

5. A welded shell-tube-tube-sheet structure according to claim 4, characterized in that: The four limiting steps distributed on the copper tube plate and the fan-shaped end cover on the air pipe end cover assembly are all fan-shaped structures.

6. A welded shell-tube-tube-sheet structure according to claim 1, characterized in that: The heat transfer tube is a "U" shaped structure.

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