Strength expansion pipe plate slotting structure

Abstract

A slotting structure of a strength expansion connecting pipe plate comprises a pipe plate and a through hole which is formed in the pipe plate and used for inserting a heat exchange pipe and serves as a pipe hole, a conventional groove is formed in the inner wall of the pipe hole, meanwhile, a plurality of grooves surrounding the inner wall of the through hole by a circle are formed in the inner wall of the pipe hole in the axial direction at equal intervals, the depth of each groove is 0.5-0.6 mm, each groove is triangular, the width of each groove is 0.5-0.6 mm, and the width of each groove is 0.5-0.6 mm. And the space between the grooves is 1.5 mm. The utility model is suitable for the strength expansion connection of the heat exchange tube and the tube plate in the manufacturing process of a heat exchanger, especially the expansion connection of the tube plate and the heat exchange tube made of special materials, non-ferrous metals and materials with hardness difference less than 30HB. The heat exchanger is simple in structure and convenient to install, the sealing performance of the heat exchange tube and the tube plate is enhanced, the pull-out resistance of the heat exchange tube is increased, the quality of the heat exchanger is improved, and the service life of equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to heat exchanger heat exchange pipe and pipe plate connecting technical field, specifically is a kind of strength expansion joint pipe plate slot structure. BACKGROUND

[0002] Currently in the heat exchanger manufacturing process in domestic, the connection of heat exchanger and pipe plate mainly adopts GB / T151-2014 "Heat Exchanger" standard, in the standard, it is specified that the groove width of strength expansion joint is 3mm, depth is 0.5mm, groove distance from pipe plate surface is 8mm, groove spacing is 6mm.This structure is good in sealing and stress effect when conventional material (carbon steel) and the hardness difference of heat exchange pipe and pipe plate reaches about 30HB specified in relevant standard.But for special material or the hardness difference of heat exchange pipe and pipe plate does not reach about 30HB specified, sealing effect is poor, and leakage phenomenon often occurs after a period of time of equipment operation, which affects the quality and service life of heat exchanger.In order to solve this problem, more standard plus new structure combination form or directly using new structure is used in domestic.For example, Chinese patent CN 219796421 U (pipe plate hole slot structure and connecting structure) is thread plus conventional form, and the structure is complex, and the processing and manufacturing difficulty is great, and the thread sealing property is poor, and the precision is difficult to guarantee. UTILITY MODEL CONTENTS

[0003] The utility model provides a kind of strength expansion joint pipe plate slot structure for the deficiency of prior art, the pipe plate slot structure changes slotting form, overcome the problem that original structure pipe plate slotting is not obvious, and expansion joint hardness difference is too small to affect expansion joint quality, can effectively improve sealing effect.

[0004] The technical scheme of the utility model is as follows:

[0005] A kind of strength expansion joint pipe plate slot structure, including pipe plate and the through hole for inserting heat exchange pipe as pipe hole opened on pipe plate, the inner wall of the pipe hole is provided with conventional groove, while the inner wall of the pipe hole is equidistantly opened along the axial direction and is provided with a plurality of recesses around the inner wall of through hole, the depth of the recess is 0.5-0.6mm, the recess is triangle, groove width is 0.5-0.6mm, and groove spacing is 1.5mm.

[0006] At least 6 the recesses form a group of slotting.

[0007] The slotting is arranged on one side of conventional groove.

[0008] The slotting is arranged on both sides of conventional groove.

[0009] Compared with the prior art, the utility model is suitable for the strength expansion joint of heat exchange pipe and pipe plate in the heat exchanger manufacturing process, especially the expansion joint of the pipe plate and heat exchange pipe of special material, nonferrous metal and material hardness difference less than 30HB. The utility model discloses on the basis of standard slot increases one group or two groups, guarantees the close adhesion of heat exchange pipe and pipe plate, strengthens the sealing performance of heat exchange pipe and pipe plate, increases the anti -tension of heat exchange pipe, improves the quality of heat exchanger, prolongs the service life of equipment. The utility model structure is simple, and the installation is convenient, and the effect is remarkable, can be popularized widely in the tubular heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the structural schematic diagram of the utility model;

[0011] Figure 2 It is the assembly schematic diagram (single group) of the utility model;

[0012] Figure 3 It is the assembly drawing (double group) of the utility model;

[0013] Figure 4 It is the slot local cutaway view. DETAILED DESCRIPTION

[0014] The utility model will be further explained in detail in combination with the drawings and implementation.

[0015] As Figure 1 Shown, a kind of strength expansion joint pipe plate slot structure, including pipe plate and the through hole for inserting heat exchange pipe as pipe hole 2 opened on pipe plate, the conventional groove 3 of standard GB / T151 strength expansion joint slot size is opened on the inner wall of the pipe hole 2, while the recess along the inner wall of the through hole is equidistantly opened on the inner wall of the pipe hole 2 along the axial direction, the depth of the recess is 0.5-0.6mm, the recess is triangle, groove width is 0.5-0.6mm, groove spacing is 1.5mm.

[0016] At least 6 the recess constitutes a group of slot 4. This structure can increase the contact area between pipe plate and pipe, so that the gap can be better filled during expansion, thereby improving the tightness and strength of expansion. In addition, the slot can effectively disperse the expansion stress, reduce the influence of pull-out force, and ensure the stability and safety of the connection.

[0017] The slot 4 is arranged on one side of the conventional groove 3. It is suitable for heat exchangers with thin pipe plate thickness and medium that does not allow micro leakage.

[0018] The slot 4 is arranged on both sides of the conventional groove 3. It is suitable for heat exchangers with thick pipe plate thickness and medium that does not allow micro leakage.

[0019] The expansion joint is a kind of connection method for fixing the heat exchange pipe on the tube plate, the end of the heat exchange pipe is plastically deformed by the pipe expander, so as to be tightly attached to the tube plate, thereby achieving the purpose of sealing and fixing. During the expansion joint process, the end of the pipe is plastically deformed, and the tube plate is in an elastic deformation state, after the expansion joint is completed, the tube plate generates extrusion pressure on the pipe, so that the two are tightly combined. By changing the slotting form, it is easier to tightly attach to the tube plate, even if one groove leaks, it does not affect other grooves, six grooves and ensure the sealing, effectively increase the pull-off force of the heat exchange pipe.

[0020] When assembling Figure 2 、 Figure 3 , the heat exchange pipe 5 is inserted into the pipe hole 2, and the heat exchange pipe is connected with the tube plate by the expansion joint device (mechanical expansion or hydraulic expansion), so as to tightly attach the heat exchange pipe to the tube plate, thereby achieving the connection effect of the heat exchange pipe and the tube plate.

[0021] The above description is only the application embodiment of the utility model, of course, cannot with this to limit the right range of the utility model, therefore, the equivalent change made in the patent range of the utility model application still belongs to the protection range of the utility model.

Claims

1. A slotted structure of a strong expanded tube plate, comprising a tube plate and a through hole opened on the tube plate as a tube hole for inserting a heat exchange tube, characterized in that, The inner wall of the pipe hole (2) is provided with a conventional groove (3), and a plurality of grooves are equidistantly arranged on the inner wall of the pipe hole (2) along the axial direction and surround the inner wall of the through hole, the depth of the grooves is 0.5-0.6mm, the grooves are triangular, the groove width is 0.5-0.6mm, and the groove spacing is 1.5mm.

2. The slotted structure of a strength expanded pipe plate according to claim 1, wherein At least 6 of the grooves form a group of grooves (4).

3. A slotted structure of a strength expanded pipe plate according to claim 2, wherein The group of grooves (4) is arranged on one side of the conventional groove (3).

4. The slotted tubular plate of claim 2, wherein The group of grooves (4) is arranged on both sides of the conventional groove (3).

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