Phase Change Cold Storage Device Having Vortex Coiled Tubes

Patent metadata

Field	Value
Publication number	US-2023040985-A1
Application number	US-202017790304-A
Country	US
Kind code	A1
Filing date	Jul 3, 2020
Priority date	Jan 7, 2020
Publication date	Feb 9, 2023
Grant date	—

Abstract

The present invention provides a phase change cold storage device having vortex coiled tubes, which falls within the technical field of low temperatures and comprises an inlet tube, an outlet tube, a tube plate, a baffle plate, vortex coiled tubes, a cylinder body, a central tube, a support frame, a seal head and a saddle, wherein the tube plate is fixedly connected to the cylinder body, a lower end position and a central position of the tube plate are respectively perforated, the inlet tube and the outlet tube are respectively connected to a lower end position and a central position of the tube plate, the baffle plate and the vortex coiled tubes are mounted on the central tube, one end of the central tube is fixed on the tube plate, and the other end is inserted through the support frame connected to the cylinder body, the head is connected to the cylinder, provided on the opposite side of the inlet and outlet tubes, and the saddle is provided below the cylinder. The present invention has a compact structure, is easy to manufacture, and easily enhances heat transfer with vortex coiled tubes, and at the same time, has a good cold storage effect and a wide application range.

First claim

1 . A phase change cold storage device having vortex coiled tubes, characterized by comprising an inlet tube ( 1 ), an outlet tube ( 2 ), a tube plate ( 3 ), a baffle plate ( 4 ), vortex coiled tubes ( 5 ), a cylinder body ( 6 ), a central tube ( 7 ), a support frame ( 8 ), a seal head ( 9 ) and a saddle ( 10 ), wherein the tube plate ( 3 ) is fixedly connected to the cylinder body ( 6 ), a lower end position and a central position of the tube plate ( 3 ) are respectively opened, the inlet tube ( 1 ) and the outlet tube ( 2 ) are respectively connected to a lower end position and a central position of the tube plate ( 3 ), and the baffle plate ( 4 ) and the vortex coiled tubes ( 5 ) are mounted on the central tube ( 7 ), one end of the central tube ( 7 ) is fixed on the tube plate ( 3 ), and the other end is inserted on a support frame ( 8 ) connected to a cylinder body ( 6 ); the seal head ( 9 ) is connected to the cylinder body ( 6 ) and arranged on the other side opposite to the inlet tube ( 1 ) and the outlet tube ( 2 ); and the saddle ( 10 ) is arranged below the cylinder body ( 6 ).

2 . The phase change cold storage device having vortex coiled tubes according to claim 1 , characterized in that: there are N baffle plates ( 4 ) (N≥2), and M vortex coiled tubes ( 5 ) are mounted between every two baffle plates ( 4 ) (M≥4); the baffle plate ( 4 ) has a central opening, and the whole is in an arcuate shape or a disc-annular shape; the size of the central opening is adapted to the diameter of the central tube ( 7 ).

3 . The phase change cold storage device having vortex coiled tubes according to claim 1 , characterized in that: the vortex coiled tube ( 5 ) comprises backing strips ( 17 ), backing rings ( 18 ), a support ring ( 19 ) and coiled tubes ( 21 ); the backing rings ( 18 ) are welded between rings of the coiled tubes ( 21 ); four backing rings ( 18 ) are uniformly distributed and fixedly arranged on the inner rings of the coiled tubes ( 21 ) and are spot-welded on the support rings ( 19 ); the backing strips ( 17 ) are uniformly distributed along the circumference between the backing rings ( 18 ); the backing rings ( 18 ) are finally distributed along a plane in a stepwise increasing radial manner; and the thickness of the backing rings ( 18 ) is 1-5 mm.

4 . The phase change cold storage device having vortex coiled tubes according to claim 3 , characterized in that: the two ends of the coiled tube ( 21 ) are closed, and a phase change material is contained inside; the support rings ( 19 ) are lined with substrate backing strips ( 20 ) at a gap between the inner rings of the coiled tubes ( 21 ), and the thickness of the substrate backing strips ( 20 ) is adapted to the outer diameter of the coiled tubes ( 21 ); the backing strips ( 17 ) are flat, and the inner diameter of the support ring ( 19 ) is the same as the outer diameter of the central tube ( 7 ); the support rings ( 19 ) have the same thickness as the backing strips ( 17 ) and backing rings ( 18 ) and a length slightly greater than the outer diameter of the coiled tubes ( 21 ).

5 . The phase change cold storage device having vortex coiled tubes according to claim 1 , characterized in that: the central tubes ( 7 ) are of a single-tube or double-tube structure; the central tube ( 7 ) comprises an outer tube ( 11 ), an inner tube ( 12 ), an annular tube plate ( 13 ) and fins ( 14 ) nested between the inner tube ( 12 ) and the outer tube ( 11 ); and the inner tube ( 12 ) and the outer tube ( 11 ) are filled with a phase change material therebetween.

6 . The phase change cold storage device having vortex coiled tubes according to claim 5 , characterized in that: the fins ( 14 ) are a circular fin, a spiral fin, a corrugated fin or a needle-shaped fin.

7 . The phase change cold storage device having vortex coiled tubes according to claim 1 , characterized in that: the support frame ( 8 ) is composed of a sleeve ( 15 ) and a support rib plate ( 16 ), and the diameter of the sleeve ( 15 ) is slightly larger than the diameter of the central tube ( 7 ).

8 . The phase change cold storage device having vortex coiled tubes according to claim 1 , characterized in that: the outer wall of the cylinder body ( 6 ) is wrapped with an insulation layer composed of an insulation material.

9 . The phase change cold storage device having vortex coiled tubes according to claim 4 , characterized in that: the phase change material in the coiled tubes ( 21 ) and the central tube ( 7 ) is an organic phase change material, an inorganic phase change material or a composite phase change material; the organic phase change material is octanoic acid, nonanoic acid, decanoic acid, dodecanol, tert-pentanol, ethylene glycol, n-dodecane, n-tetradecane, n-pentadecane or n-hexadecane, and the inorganic phase change material is Na 2 SO 4 ·10H 2 O or Ge 1 Sb 2 Te 4 .

10 . The phase change cold storage device having vortex coiled tubes according to claim 9 , characterized in that: the fluid in the device is a cryogenic fluid, the inlet temperature of which is lower than the phase change temperature of the phase change material in the coiled tubes ( 21 ) and the central tube ( 7 ).

Assignees

• Nanjing University Of Technology

Inventors

• Ling Xiang
• Zhang Zhen

Classifications

• Y02E60/14

  Thermal energy storage · CPC title

• F28F21/083

  from stainless steel · CPC title

• F28D7/12

  the surrounding tube being closed at one end, e.g. return type (F28D7/14 takes precedence) · CPC title

• F28F21/085

  from copper or copper alloys · CPC title

• F28F9/0135

  formed by grids having only one tube per closed grid opening (F28F9/0132 and F28F9/0133 take precedence) · CPC title