Plate type heat exchanger and refrigeration cycle apparatus

Patent metadata

Field	Value
Publication number	US-10697677-B2
Application number	US-201515767247-A
Country	US
Kind code	B2
Filing date	Dec 11, 2015
Priority date	Dec 11, 2015
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A plate heat exchanger includes a plate stack including a plurality of heat transfer plates stacked with each other. Each of the heat transfer plates includes a heat medium inflow hole serving as an inlet for a heat medium, a heat medium outflow hole serving as an outlet for the heat medium, a refrigerant inflow hole serving as an inlet for refrigerant, and a refrigerant outflow portion located below the refrigerant inflow hole and serving as an outlet for the refrigerant. The heat transfer plates define heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward, arranged alternately with one another. Each of the heat medium passages and the refrigerant passages is defined between adjacent ones of the heat transfer plates.

First claim

The invention claimed is:

1. A plate heat exchanger comprising:
a plate stack including a plurality of heat transfer plates stacked with each other, each of the heat transfer plates including
a heat medium inflow hole serving as an inlet for a heat medium,
a heat medium outflow hole serving as an outlet for the heat medium,
a refrigerant inflow hole serving as an inlet for refrigerant, and
a refrigerant outflow hole located below the refrigerant inflow hole and serving as an outlet for the refrigerant,
the heat transfer plates defining
a plurality of heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and
a plurality of refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward,
each of the plurality of heat medium passages and the plurality of refrigerant passages being defined between adjacent ones of the heat transfer plates such that a heat medium passage and a refrigerant passage are arranged alternately with one another; and

a refrigerant outlet nozzle attached to the plate stack and projecting from the plate stack along a stacking direction of the heat transfer plates, the refrigerant outlet nozzle being configured to let therethrough the refrigerant, leaving the refrigerant outflow portion hole, out of the plate stack,
a lower edge of the refrigerant outflow hole being located above a lower edge of the inner surface of the refrigerant outlet nozzle,
the refrigerant outlet nozzle including a projection projecting upward from an inner surface of the refrigerant outlet nozzle.

2. The plate heat exchanger of claim 1 , wherein the plate stack has a bend that is located at a lower portion of the plate stack,
at least one heat transfer plate of the heat transfer plates having the bend,
the bend projecting toward a heat transfer plate adjacent to the heat transfer plate to which the bend is provided.

3. The plate heat exchanger of claim 2 , wherein the bend projects toward the heat transfer plate that is adjacent to one heat transfer plate, more away from the refrigerant outlet nozzle, of two heat transfer plates adjacent to the heat transfer plate to which the bend is provided.

4. The plate heat exchanger of claim 1 ,
wherein the plate stack includes a cut provided to a lower portion of the plate stack and a cover covering the cut,
wherein the cut and the cover are provided to at least one of the heat transfer plates,
wherein the cover serves as part of a bottom portion for the plurality of refrigerant passages, and
wherein the bottom portion for the plurality of refrigerant passages is located below the lower part of the inner surface of the refrigerant outlet nozzle.

5. A plate heat exchanger comprising:
a plate stack including a plurality of heat transfer plates stacked with each other, each of the heat transfer plates including
a heat medium inflow hole serving as an inlet for a heat medium,
a heat medium outflow hole serving as an outlet for the heat medium,
a refrigerant inflow hole serving as an inlet for refrigerant, and
a refrigerant outflow portion located below the refrigerant inflow hole and serving as an outlet for the refrigerant, the heat transfer plates defining
a plurality of heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and
a plurality of refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward,

each of the plurality of heat medium passages and the plurality of refrigerant passages being defined between adjacent ones of the heat transfer plates such that a heat medium passage and a refrigerant passage are arranged alternately with one another; and

a refrigerant outlet nozzle attached to the plate stack and projecting from the plate stack along a stacking direction of the heat transfer plates, the refrigerant outlet nozzle being configured to let therethrough the refrigerant, leaving the refrigerant outflow portion, out of the plate stack,
the plate stack including a cut provided to a lower portion of the plate stack and a cover covering the cut,
the cut and the cover being provided to at least one of the heat transfer plates,
the cover serving as at least part of a bottom portion for the plurality of refrigerant passages,
the bottom portion for the plurality of refrigerant passages being located below a lower part of an inner surface of the refrigerant outlet nozzle.

6. A refrigeration cycle apparatus comprising:
a refrigerant circuit, through which refrigerant circulates, including a compressor, the plurality of refrigerant passages of the plate heat exchanger of claim 1 , an expansion device, and an evaporator connected in a loop by refrigerant pipes; and
a heat medium circuit, through which a heat medium circulates, including a pump, the plurality of heat medium passages of the plate heat exchanger, and a load side heat exchanger connected in a loop by heat medium pipes,
the plate heat exchanger functioning as a condenser that condenses the refrigerant.

7. The refrigeration cycle apparatus of claim 6 , wherein the refrigerant circulating through the refrigerant circuit contains a substance having a double bond.

8. A plate heat exchanger comprising:
a plate stack including a plurality of heat transfer plates stacked with each other, each of the heat transfer plates including
a heat medium inflow hole serving as an inlet for a heat medium,
a heat medium outflow hole serving as an outlet for the heat medium,
a refrigerant inflow hole serving as an inlet for refrigerant, and
a refrigerant outflow portion located below the refrigerant inflow hole and serving as an outlet for the refrigerant,
the heat transfer plates defining
a plurality of heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and
a plurality of refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward,
each of the plurality of heat medium passages and the plurality of refrigerant passages being defined between adjacent ones of the heat transfer plates such that a heat medium passage and a refrigerant passage are arranged alternately with one another; and

a refrigerant outlet nozzle attached to the plate stack and projecting from the plate stack along a stacking direction of the heat transfer plates, the refrigerant outlet nozzle being configured to let therethrough the refrigerant, leaving the refrigerant outflow portion, out of the plate stack, the refrigerant outlet nozzle including a projection projecting upward from an inner surface of the refrigerant outlet nozzle,
the plurality of refrigerant flow passages including a first refrigerant flow passage and a second refrigerant flow passage,
wherein
a distance between the first refrigerant flow passage and the refrigerant outlet nozzle is larger than a distance between the second refrigerant flow passage and the refrigerant outlet nozzle, and
a width of the first refrigerant flow passage is larger than a width of the second refrigerant flow passage.

Assignees

• Mitsubishi Electric Corp

Inventors

• Yanachi Satoru
• Kato Yohei
• Uchino Shinichi
• Kasai Kohei
• Obayashi Tomoyoshi
• Kadowaki Kimitaka
• Saikusa Tetsuji

Classifications

• F25B39/04 Primary

  Condensers · CPC title

• F28F9/0236

  floating elements · CPC title

• F28F9/0246

  Arrangements for connecting header boxes with flow lines · CPC title

• F28F9/028

  by using inserts for modifying the pattern of flow inside the header box, e.g. by using flow restrictors or permeable bodies or blocks with channels · CPC title

• F28D2021/007

  Condensers · CPC title