Plate-type refrigerant evaporator

• US 5,137,082 A
• Filed: 10/26/1990
• Issued: 08/11/1992
• Est. Priority Date: 10/31/1989
• Status: Expired due to Fees

• Current Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Original Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Inventors: Nakabou, Tadashi, Yamauchi, Yoshiyuki, Shimoya, Masahiro
• Primary Examiner(s): DAVIS JR, ALBERT
• Application Number:
  US07/603,623
• Time in Patent Office: 655 Days
• Field of Search: 165/152, 165/153, 165/146, 165/147, 165/903, 165/911, 165/110, 165/176, 165/150, 165/139, 62/515
• US Class Current: 165/110
• CPC Class Codes: F25B 39/022 with plate-like or laminated elements
• CPC Class Codes: F28D 1/0341 with U-flow or serpentine-flow inside the conduits
• CPC Class Codes: F28D 2021/0085 Evaporators
• CPC Class Codes: F28F 13/08 by varying the cross-section of the flow channels
• CPC Class Codes: F28F 3/044 the deformations being pontual, e.g. dimples
• CPC Class Codes: Y10S 165/183 Indirect-contact evaporator
• CPC Class Codes: Y10S 165/903 Convection

Abstract

A plate-type heat exchanger comprises a stack of flat tubes each composed of a pair of confronting core plates jointed to each other and defining a fluid passage. A cross sectional area of the fluid passage is increased along the flowing direction of the refrigerant. A plurality of ribs are disposed on the fluid passage. A flowing resistance of the ribs which are disposed near an outlet tank is lower than that of the ribs which are disposed near an inlet tank.

Claims

1. A plate-type refrigerant evaporator comprising:

a plurality of flat tubes each formed by two core plates sealingly jointed together;

each flat tube including an inlet tank portion and two outlet tank portions and defining a fluid passage therein, the inlet tanks portion being disposed on a center line of the core plate, each of two outlet tank portions being disposed at both side of the inlet tank portion;

the fluid passage including a center passage and two branch passage, the center passage, the center passage being connected with the inlet tank portion and each of two branch passage being connected with each outlet tank portion in such a manner that the core plate is symmetric with respect to the center line of the core plate, and a cross sectional area of the fluid passage being increased along a flowing direction of the refrigerant; and

a corrugated fin interposed between and secured to adjacent core plates of each adjacent pain of the flat tubes.

2. A plate-type refrigerant evaporator claimed in claim 1 wherein the flat tubes are successively stacked in the direction of each flat tube.

3. A plate-type refrigerant evaporator claimed in claim 1 wherein the flat tubes and the corrugated fin are made of aluminum alloy.

4. A plate-type refrigerant evaporator claimed in claim 1 wherein the flat tubes and the corrugated fins are soldered to each other.