Fluid heating device for engine

Patent metadata

Field	Value
Publication number	US-10520218-B2
Application number	US-201514813717-A
Country	US
Kind code	B2
Filing date	Jul 30, 2015
Priority date	Jul 31, 2014
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

There is provided a fluid heating device for an engine with increased heating efficiency of fluid. The fluid heating device for an engine includes: a holder; a heater; and a radiator pipe, the radiator pipe is inserted into the holder, the heater is housed in the holder, heat of the heater is radiated to fluid passing through the radiator pipe via the radiator pipe. The radiator pipe is formed by an outer pipe and an inner pipe in the outer pipe, the heat generated by the heater is transferred to the outer pipe and the inner pipe, the fluid passing inside and outside the inner pipe in the outer pipe is heated by heat radiation from the outer pipe and the inner pipe.

First claim

What is claimed is:

1. A fluid heating device for an engine comprising:
a holder:
a heater housed in the holder; and
a radiator pipe inserted into the holder,
wherein the radiator pipe is formed by an outer pipe and at least one inner pipe in the outer pipe, heat generated by the heater is transferred to the outer pipe and the inner pipe, a fluid passing inside and outside the inner pipe in the outer pipe is heated by heat radiation from the outer pipe and the inner pipe,
wherein an outwardly-facing surface of the inner pipe is in contact with an inwardly-facing surface of the outer pipe so that the heat of the heater is transferred to the inner pipe via the outer pipe, and
wherein the holder and the outer pipe respectively comprise a single straight pipe extending straight over an entire length of the holder and the outer pipe,
wherein the outer pipe extends over the entire length of the holder in an axial direction of the holder and has a flat outer-pipe wall portion with a flat outwardly-facing outer-pipe surface and a flat inwardly-facing outer pipe surface, the heater is flat in form, partially placed at a respective central part of the holder and the outer pipe in a respective axial direction of the holder and the outer pipe, and placed along the flat outwardly-facing outer-pipe surface, and the inner pipe is in contact with the flat inwardly-facing outer-pipe surface,
and wherein an outwardly-facing surface at the central part of the outer pipe in the axial direction of the outer pipe comprises a heat receiving face along which the heater extends and a fitting face fitted into the holder, the heat receiving face is formed at a part of an entire circumference of the outwardly-facing surface at the central part of the outer pipe in the axial direction of the outer pipe, and the fitting face is formed at an entire rest part of the entire circumference of the outwardly-facing surface at the central part of the outer pipe in the axial direction of the outer pipe.

2. The fluid heating device for the engine according to claim 1 ,
wherein at least one of opposite end portions of the outer pipe and the inner pipe is protruding outside from an end portion of the holder.

3. The fluid heating device for the engine according to claim 1 ,
wherein a wall of the inner pipe has radial corrugations formed by folding the wall alternately inward and outward.

4. The fluid heating device for the engine according to claim 3 ,
wherein the radial corrugations extend in an axial direction of the outer pipe and are spirally twisted about a central axis of the outer pipe.

5. The fluid heating device for the engine according to claim 1 ,
wherein the inner pipe in the outer pipe comprises plurality of inner pipes and the plurality of inner pipes is disposed in a bundle in the outer pipe.

6. The fluid heating device for the engine according to claim 5 ,
wherein the inner pipes are spirally twisted about a central axis of the outer pipe.

7. The fluid heating device for the engine according to claim 6 ,
wherein at least one of opposite end portions of the outer pipe and at least one, inner pipe of the plurality of inner pipes is protruding outside from an end portion of the holder.

8. The fluid heating device for the engine according to claim 2 ,
wherein a wall of the inner pipe has radial corrugations formed by folding the wall alternately inward and outward.

9. The fluid heating device for the engine according to claim 8 ,
wherein the radial corrugations extend in an axial direction of the outer pipe and are spirally twisted about a central axis of the outer pipe.

10. The fluid heating device for the engine according to claim 2 ,
wherein the inner pipe in the outer pipe comprises a plurality of inner pipes and the plurality of inner pipes is disposed in a bundle in the outer pipe.

Assignees

• Kubota Kk

Inventors

• Okada Koji
• Fujii Yasuo
• Ishida Mikio

Classifications

• F24H9/0021

  Sleeves surrounding heating elements or heating pipes, e.g. pipes filled with heat transfer fluid, for guiding heated liquid · CPC title

• F24H1/121

  using electric energy supply · CPC title

• F01M2013/0455

  with a de-icing or defrosting system · CPC title

• F01M5/001

  Heating · CPC title

• F02M31/125

  Fuel · CPC title