Twisted tube heat exchanger and manufacturing method of twisted tube heat exchanger

A heat exchanger and twisted-tube technology, applied in the field of twisted-tube heat exchangers, can solve the problems of content regulation, unpredictable anti-corrosion effect, solder corrosion, etc., and achieve the effect of anti-corrosion

CN104236339BInactive Publication Date: 2017-04-12MITSUBISHI ELECTRIC CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-04-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

A twisted tube heat exchanger which can prevent corrosion of a brazed joined part of water tubing is provided. A twisted tube heat exchanger 1, comprises: water tubing 3 which is made of phosphorus deoxidized copper, and which is provided with plural rows of crests and valley bottoms on the circumference thereof in a continuous and spiral form for each row; refrigerant tubing 5 which is spirally wound up and secured along the shape of the crest and valley bottom on the circumference of the water tubing 3; and joint tubing 4 which is made of phosphorus deoxidized copper, and which is connected to an end of the water tubing 3, wherein a joined part between the water tubing 3 and the joint tubing 4 is brazed with a brazing material 2 of phosphorus copper filler metal containing 4.0 to 8.0 weight% of tin, and 6.8 to 8.0 weight% of phosphorus, but containing no silver.
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Description

technical field

[0001] The present invention relates to a twisted tube heat exchanger used in a heat pump water heater and a manufacturing method of the twisted tube heat exchanger. Background technique

[0002] As a water-refrigerant heat exchanger used in a heat pump water heater, for example, a twisted tube heat exchanger is known. The twisted tube heat exchanger uses a twisted tube with a spiral groove on the outer periphery as a water pipe, and a refrigerant pipe is wound along the spiral groove on the outer periphery of the water pipe, and the water pipe and the refrigerant pipe are caulked. The heater exchanges heat between the water flowing in the water pipe and the refrigerant flowing in the refrigerant pipe. The spiral groove provided in the water pipe has the effect of generating eddy current on the water side to improve heat exchange performance.

[0003] The water pipe of the water-refrigerant heat exchanger is connected with the external machine through the c...

Examples

Embodiment approach 1

[0018] figure 1 It is a figure which schematically shows the cross section of the twisted-tube heat exchanger in Embodiment 1 of this invention along the water-tube longitudinal direction. Such as figure 1 As shown, for the twisted tube heat exchanger 1 , a twisted tube with a plurality of (for example, 3) valleys provided on the outer periphery and each valley is continuously spirally arranged is used as the water pipe 3 . For the water pipe 3 , both ends of the phosphorus-deoxidized copper smooth pipe were fixed, a mandrel was inserted into the inner diameter side, and the phosphorus-deoxidized copper smooth pipe was continuously twisted to form a plurality of valley bottoms. At this time, by controlling the helical pitch P of the water pipe 3 with high precision, it is possible to stably insert the refrigerant pipe 5 described later.

[0019] On the outer periphery of the water pipe 3, the refrigerant pipe 5 is spirally wound along the shape of the bottom of each valley. ...