Processing molding method for stainless steel plate type heat exchanger

A technology of plate heat exchangers and stainless steel plates, applied in forming tools, metal processing equipment, manufacturing tools, etc., can solve the problems of easy deformation and warping of plate heat exchangers, easy accumulation of refrigerant and condensing oil, and linear expansion coefficient of stainless steel Large and other problems, to achieve the effect of improving welding efficiency, improving work effect, and small flow resistance of refrigerant

Inactive Publication Date: 2011-05-25
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large number of welds and dense distribution on the plate heat exchanger, the welding heat input of ordinary resistance welding method is relatively large, and because of the large linear expansion coefficient and low thermal conductivity of stainless steel (about 17w / m×kJ), resistance welding is easy to produce The large welding residual stress causes the plate heat exchanger to be easily deformed and warped after welding and subsequent use, the flow channel is easy to form dead angles, and the refrigerant and condensing oil are easy to accumulate

Method used

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  • Processing molding method for stainless steel plate type heat exchanger
  • Processing molding method for stainless steel plate type heat exchanger
  • Processing molding method for stainless steel plate type heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] see figure 1 with figure 2 , two 304L stainless steel plates with a length of 1.5m, a width of 0.8m, and a thickness of 1.2mm are processed and processed. To form surface micro-patterns, two stainless steel plates are welded at 880 equidistant points by means of current-carrying friction welding with a rotation speed of 2000r / min, a welding speed of 120mm / min, and a current-carrying current of 2KA. Honeycomb solder joints, 4 isolated welds with a length of 1300mm, and the plates are sealed and welded; the aluminum-copper composite inlet pipe and the aluminum-copper composite outlet pipe are sealed and connected to the stainless steel evaporation plate body by arc welding; the inflation positioning mold is adopted, The stainless steel evaporating plate is bulged by high-pressure gas to form a honeycomb-type evaporating plate with hollow channels and dimple-like corrugations on the surface; then other post-welding processes are performed, such as grinding, painting, etc...

Embodiment 2

[0068] see figure 1 with image 3 , Two pieces of 316 stainless steel with a length of 1.5m, a width of 0.8m, and a thickness of 1.3mm are processed and processed, the inner and outer surfaces of the stainless steel plate are subjected to surface shot peening and nano-treatment, and the superimposed inner surface is formed by mechanical micro-rolling The surface is micro-patterned, and laser welding is adopted. The power is 1200W, the welding speed is 1.8m / min, and the attenuation speed is 30%. and sealing and welding the surroundings; the aluminum-copper composite inlet pipe and the aluminum-copper composite outlet pipe are sealed and connected with the stainless steel condensing plate body by arc welding; the inflation positioning mold is used to bulge the stainless steel evaporating plate through high-pressure gas, Make it into a serpentine flow channel type evaporating plate with concave and convex surfaces with semi-cylindrical curved and serpentine hollow flow channels;...

Embodiment 3

[0070] see figure 1 with image 3 , Two pieces of 18-8 stainless steel with a length of 1.5m, a width of 0.8m, and a thickness of 1.1mm are processed and processed, and the inner and outer surfaces of the stainless steel plate are subjected to surface shot peening and nano-treatment, and the superimposed inner surface is subjected to mechanical micro-rolling Press to form micro-patterns on the surface, using water-cooled resistance welding method, welding two stainless steel plates with 14 equal-spaced welding passes into the middle welding pass with a welding current of 8KA, a welding speed of 45cm / min, and an electrode pressure of 5KN. Seal and weld the surroundings; connect the aluminum-copper composite inlet pipe and the aluminum-copper composite outlet pipe with the stainless steel condensing plate body by arc welding; use an inflation positioning mold to bulge the stainless steel evaporating plate with high-pressure gas to make it It is formed into a serpentine flow cha...

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Abstract

The invention discloses a stainless steel plate type heat exchanger and a processing molding method thereof. The plate type heat exchanger comprises a snakelike flow channel type and honeycomb flow channel type evaporation plate or a cold plate. The plate type heat exchanger adopts a stainless steel plate and consists of a stainless steel upper plate, a stainless steel lower plate, an inlet pipe and an outlet pipe, wherein the two stainless steel plates are overlapped and connected by a special welding method; the inlet pipe and the outlet pipe are inserted in the upper end and the lower end between the two stainless steel plates and are connected with the stainless steel plate type heat exchanger body by using an electric arc welding method; and then the plate type heat exchanger is finally molded through a mould and high-pressure bulging technology.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a stainless steel plate heat exchanger and a processing and forming method thereof. Background technique [0002] The refrigeration system is inseparable from the heat exchanger. The plate heat exchanger includes an evaporating plate and a condensing plate. The traditional plate heat exchanger mainly has a serpentine flow channel type and a honeycomb type evaporating plate or condensing plate. The ordinary evaporating plate or condensing plate Generally, two 1-3mm thick 304 stainless steel plates with a length of 1.2-1.8m and a width of 0.5-1.2m are processed into a serpentine flow channel or a honeycomb flow channel by ordinary resistance welding. Carry out bulging to form serpentine flow channel and honeycomb flow channel heat exchangers, allowing refrigerant (such as R-22 or ammonia) to flow in hollow flow channels. Due to the large number of weld beads and dense distributio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K11/08B23K26/42B23P15/26B21D37/01F25B39/00F28F21/08B23K11/11B23K26/20B23K26/244B23K26/70
Inventor 罗键王颖
Owner CHONGQING UNIV
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