# US 2021/0080184 A1 · Heat exchanger

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- Number: US 2021/0080184 A1
- Document ID: US20210080184A1
- Status: Published application
- Kind: A1
- Application number: 16/895,167
- Filed: 2020-06-08
- Published: 2021-03-18
- Earliest claimed: 2019-09-12
- Assignees: NGK Insulators, Ltd.
- Applicants: Ngk Insulators, Ltd.
- Inventors: Yutaro FUMOTO; Tatsuo KAWAGUCHI
- Web page: https://patentgrep.com/patent/US20210080184A1

## CPC

- F28D 7/10: the conduits being arranged one within the other, e.g. concentrically {(multiple wall tubes for leak detection F28F1/003)}
- F01N 3/28: Construction of catalytic reactors
- F01N 13/009: {having two or more separate purifying devices arranged in series}
- F28D 1/0246: {heat-exchange elements having several adjacent conduits forming a whole, e.g. blocks}
- F28D 7/103: {consisting of more than two coaxial conduits or modules of more than two coaxial conduits}
- F28D 7/1676: {with particular pattern of flow of the heat exchange media, e.g. change of flow direction}
- F28D 21/0003: {the heat being recuperated from exhaust gases (F28D21/0014 takes precedence)}
- F28F 1/40: the means being only inside the tubular element
- F28F 7/02: Blocks traversed by passages for heat-exchange media {(F28D7/0008 takes precedence)}
- F28F 19/01: by using means for separating solid materials from heat-exchange fluids, e.g. filters
- F28F 21/04: of ceramic; of concrete; of natural stone
- F28F 27/02: for controlling the distribution of heat-exchange media between different channels ({static flow control means in header boxes F28F9/026}; arrangements of guide plates or guide vanes F28F9/22, F28F25/12)
- F01N 2410/03: in case of low temperature
- F01N 2410/06: at cold starting
- F01N 2900/1602: Temperature of exhaust gas apparatus
- F28D 2021/008: {for vehicles}
- F28F 2250/06: Derivation channels, e.g. bypass
- Y02T 10/12: Improving ICE efficiencies
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A heat exchanger includes: a hollow pillar shaped honeycomb structure; a first cylindrical member fitted to a surface of an outer peripheral wall of the pillar shaped honeycomb structure; a second cylindrical member fitted to a surface of an inner peripheral wall of the pillar shaped honeycomb structure; a cylindrical guide member having a portion, the portion being disposed on a radially inner side of the second cylindrical member with a distance so as to form the flow path for the first fluid; an upstream cylindrical member connecting an upstream end of the first cylindrical member to an upstream side of the guide member; and a downstream cylindrical member connected to a downstream end of the first cylindrical member. The guide member includes an inclined portion that inclines to its downstream side.

## Claims

### Claim 1

A heat exchanger, comprising:
a hollow pillar shaped honeycomb structure having an inner peripheral wall, an outer peripheral wall and partition walls each disposed between the inner peripheral wall and the outer peripheral wall, the partition walls defining a plurality of cells to form flow paths for a first fluid, each of the cells extending from an inflow end face to an outflow end face;
a first cylindrical member fitted to a surface of the outer peripheral wall of the pillar shaped honeycomb structure;
a second cylindrical member fitted to a surface of the inner peripheral wall of the pillar shaped honeycomb structure;
a cylindrical guide member having a portion, the portion being disposed on a radially inner side of the second cylindrical member with a distance so as to form the flow path for the first fluid;
an upstream cylindrical member connecting an upstream end of the first cylindrical member to an upstream side of the guide member; and
a downstream cylindrical member connected to a downstream end of the first cylindrical member,
wherein the guide member comprises an inclined portion that inclines to its downstream side; and
wherein a communication port for directing the first fluid flowing on an inner peripheral side of the guide member to a space between an inner peripheral side of the second cylindrical member and an outer peripheral side of the guide member is provided between a tip of the inclined portion of the guide member and the second cylindrical member or at the inclined portion of the guide member.

### Claim 2 (depends on 1)

The heat exchanger according to claim 1, wherein a cross-sectional area of the guide member in a forming region for the communication port in a direction perpendicular to an axial direction is substantially the same as a cross-sectional area of a downstream end of the downstream cylindrical member in the direction perpendicular to the axial direction.

### Claim 3 (depends on 1)

The heat exchanger according to claim 1, wherein a ratio RA represented by the following equation (1) is 75% or less:
RA=|A1−A2|/A2×100 (1)
in which A1 is a cross-sectional area of the downstream end of the downstream cylindrical member in the direction perpendicular to the axial direction, and A2 is a cross-sectional area of the guide member in the forming region for the communication port in the direction perpendicular to the axial direction.

### Claim 4 (depends on 1)

The heat exchanger according to claim 1, wherein a ratio RB represented by the following equation (2) is 700% or less:
RB=|A3−A4|/A4×100 (2)
in which A3 is a cross-sectional area of a flow path end portion between the first cylindrical member and the second cylindrical member in the direction perpendicular to the axial direction or a smaller value among values calculated by π×E×F;
A4 is an opening area of the communication port;
when the communication port is provided between the tip of the inclined portion of the guide member and the second cylindrical member, E is a distance between the downstream end of the second cylindrical member and the downstream cylindrical member in the direction parallel to the axial direction, and F is an inner diameter at the downstream end of the second cylindrical member;
when the communication port is provided at the inclined portion of the guide member, E is a distance between the downstream end of the guide member and the downstream cylindrical member in the direction parallel to the axial direction, and F is an inner diameter at the downstream end of the guide member.

### Claim 5 (depends on 1)

The heat exchanger according to claim 1, further comprising an outer cylindrical member arranged on a radially outer side of the first cylindrical member with a distance so as to form a flow path for a second fluid.

### Claim 6 (depends on 1)

The heat exchanger according to claim 1, further comprising an on-off valve arranged on the downstream end of the second cylindrical member or the guide member.

### Claim 7 (depends on 6)

The heat exchanger according to claim 6, wherein the on-off valve is configured to be able to adjust the flow of the first fluid inside the second cylindrical member and/or the guide member during heat exchange.