Air flow rate measurement device

Patent metadata

Field	Value
Publication number	US-11747183-B2
Application number	US-202117374202-A
Country	US
Kind code	B2
Filing date	Jul 13, 2021
Priority date	Jan 15, 2019
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

A housing has a front surface, a rear surface, and side surface connecting the front surface with the rear surface. The housing is formed by injection molding. A first sub-passage is formed in the housing and communicates a first sub-passage inlet formed in the front surface with a first sub-passage outlet formed in the rear surface. A second sub-passage is formed in the housing and communicates a second sub-passage inlet formed in a midway portion of the first sub-passage with a second sub-passage outlet at a position different from the first sub-passage outlet. A flow rate detection unit is provided in the second sub-passage. A mold parting mark is formed in the rear surface of the housing at a position away from an inner opening edge of the first sub-passage outlet.

First claim

What is claimed is:

1. An air flow rate measurement device to be installed in a main passage that is configured to cause air to flow therethrough, the air flow rate measurement device comprising:
a housing having a front surface on an upstream side of the main passage, a rear surface on a downstream side of the main passage, and a side surface connecting the front surface with the rear surface, the housing formed by injection molding;
a first sub-passage formed in the housing, the first sub-passage communicating a first sub-passage inlet, which is formed in the front surface, with a first sub-passage outlet, which is formed in the rear surface;
a second sub-passage formed in the housing, the second sub-passage communicating a second sub-passage inlet, which is formed in a midway portion of the first sub-passage, with a second sub-passage outlet, which is formed at a position different from the first sub-passage outlet;
a flow rate detection unit provided in the second sub-passage and configured to output a signal according to a flow rate of air flowing through the second sub-passage; and
a mold parting mark formed in the rear surface of the housing at a position that is away from an inner opening edge of the first sub-passage outlet.

2. The air flow rate measurement device according to claim 1 , wherein
the mold parting mark is formed in the rear surface of the housing at a position that is away from the inner opening edge of the first sub-passage outlet and that is away from the side surface.

3. The air flow rate measurement device according to claim 1 , further comprising:
a front mold parting mark formed in the front surface of the housing at a position that is away from an inner opening edge of the first sub-passage inlet.

4. The air flow rate measurement device according to claim 3 , wherein
the mold parting mark is formed in the front surface of the housing at a position that is away from the inner opening edge of the first sub-passage inlet and that is away from the side surface.

5. The air flow rate measurement device according to claim 1 , wherein
the second sub-passage outlet is formed in the rear surface of the housing, and
the mold parting mark is formed in the rear surface of the housing at a position away from an inner opening edge of the second sub-passage outlet.

Assignees

• Denso Corp

Inventors

• Tsuchiya Takuma
• Sudou Akiyuki

Classifications

• G01F1/6842 Primary

  with means for influencing the fluid flow · CPC title

• B29C33/005

  characterised by the location of the parting line of the mould parts · CPC title

• G01F5/00 Primary

  Measuring a proportion of the volume flow · CPC title

• B29C45/0025

  Preventing defects on the moulded article, e.g. weld lines, shrinkage marks (preventing defects on the preformed parts or layers B29C45/14836) · CPC title

• B29C66/306

  Applying a mark during joining · CPC title