A method for expanding and sealing a tube sheet and a tube
A technology for expansion joints and tubes, which is applied in the field of connection between metal tubes and metal plates, can solve the problems of unstable expansion joint speed, high expansion joint cost, fast wear and tear of tube expanders, etc., and achieve stable expansion joint pass rate, reduce Small expansion joint wear, reducing the effect of expansion joint temperature rise
Active Publication Date: 2016-03-09
GREE ELECTRIC APPLIANCES INC
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- Abstract
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Problems solved by technology
The existing expansion joint methods in actual production have the following disadvantages: the first pass rate of expansion joint is low and unstable, the service life of the tube expander is short, and the cost of expansion joint is high
After analysis, the cause of the above defects is: due to the large friction force of the expansion joint, the expansion speed is forced to be unstable, resulting in uneven expansion force in the circumferential direction, resulting in uneven thinning of the expansion joint (local mutation, forming a sealed channel) The expansion joint is not sealed; coupled with the friction force, the temperature of the expansion joint will rise, and the wear and tear of the expander will be accelerated, and the inner wall of the copper tube will be scratched and peeled, resulting in a low and unstable expansion joint. In addition, due to friction The larger the tube expander wears and damages quickly, the life of the tube expander is short, the consumption of the tube expander is large, and the expansion cost is high
Method used
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Embodiment Construction
[0028] Embodiments of the present invention are described in detail below in conjunction with accompanying drawings:
[0029] The tube sheet and tube expansion joint sealing method in one embodiment of the present invention is used for the expansion joint sealing of the shell tube tube plate and the copper heat exchange tube, and the steps are as follows:
[0030] 1. Check and prepare the tube expander and tube expander 1.
[0031] 2. Prepare lubricant. The lubricant in this embodiment is a liquid or solid lubricant, preferably a liquid lubricant. Further preferably, the liquid lubricant is a water-based lubricant suitable for expansion of shells and tubes, and the water-based lubricant can also achieve a certain cooling effect. Put the lubricant in the In a dedicated container, the liquid level is preferably 50mm to 60mm.
[0032] 3. Insert the expansion part 1a of the tube expander 1 below the liquid level in the prepared container containing the lubricant, so as to adh...
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The invention discloses a method for sealing of a pipe plate and a pipe through expanding and connecting. The method includes following steps: coating lubricant on the surface of an expanding and connecting portion of a pipe expander or the inner wall of an expanded and connected section of the pipe, and inserting the expanding and connecting portion into the expanded and connected section of the pipe. By the method, frictional force can be evidently reduced, temperature rise in expanding and connecting can be lowered, one-time expanding and connecting qualification rate can be improved and stabilized, expanding and connecting abrasion of the pipe expander can be remarkably reduced, service cycle of the pipe expander can be prolonged, consumption of the pipe expander can be lowered, and expanding and connecting cost can be substantially lowered.
Description
technical field [0001] The invention relates to the connection of a metal tube and a metal plate, in particular to a method for expansion joint sealing of a tube plate and a tube. Background technique [0002] At present, the steps of the method for expanding and sealing the tube sheet and the tube are as follows: ① prepare the tube expander and the tube expander; ② connect the tube expander to the tube expander and insert it into the expanded section of the tube for expansion; ③ expand After connecting about 5 tubes, pull out the tube expander to cool down; ④ Cool down to about 40 degrees Celsius and continue to expand. The existing expansion joint methods in actual production have the following disadvantages: the one-time qualified rate of expansion joint is low and unstable, the service life of the tube expander is short, and the cost of expansion joint is high. After analysis, the cause of the above defects is: due to the large friction force of the expansion joint, the...
Claims
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IPC IPC(8): B21D26/045
Inventor 梁三星
Owner GREE ELECTRIC APPLIANCES INC