Split-flow-type flow sensor device
First Claim
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1. A split-flow-type flow sensor apparatus comprising:
- a main flow passage;
a bypass flow passage with a thermal flow sensor said bypass flow passage having an entrance directly disposed in a portion of said main flow passage, a first straight pipe part extending along said main flow passage from the entrance, a bent part placed downstream from said first straight pipe part, a second straight pipe part placed downstream from the bent part and being provided with said thermal flow sensor placed on a wall face of said second straight pipe part, and an exit to said main flow passage placed downstream from said second straight pipe part;
a first rectification member placed upstream from the entrance of said bypass flow passage in said main flow passage;
a second rectification member placed upstream from said thermal flow sensor in said second straight pipe part of said bypass flow passage; and
a fixing member for resiliently fixing said second rectification member to said second straight pipe part.
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Abstract
A split-flow-type flow sensor apparatus includes a main flow passage and a bypass flow passage, wherein a thermal flow sensor is placed on the wall face of the bypass flow passage. A first rectification member is placed upstream from a diversion part to the bypass flow passage in the main flow passage, and a second rectification member is placed upstream from the thermal flow sensor in the bypass flow passage. A bypass flow passage module is inserted into an opening formed on a side of a main flow passage module. The side opening of the main flow passage module is sealed and an entrance and an exit of the bypass flow passage are positioned in the main flow passage.
78 Citations
20 Claims
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1. A split-flow-type flow sensor apparatus comprising:
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a main flow passage; a bypass flow passage with a thermal flow sensor said bypass flow passage having an entrance directly disposed in a portion of said main flow passage, a first straight pipe part extending along said main flow passage from the entrance, a bent part placed downstream from said first straight pipe part, a second straight pipe part placed downstream from the bent part and being provided with said thermal flow sensor placed on a wall face of said second straight pipe part, and an exit to said main flow passage placed downstream from said second straight pipe part; a first rectification member placed upstream from the entrance of said bypass flow passage in said main flow passage; a second rectification member placed upstream from said thermal flow sensor in said second straight pipe part of said bypass flow passage; and a fixing member for resiliently fixing said second rectification member to said second straight pipe part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A split-flow-type flow sensor apparatus comprising:
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a main flow passage; a bypass flow passage with a thermal flow sensor, said bypass flow passage having an entrance directly disposed in a portion of said main flow passage, a first straight pipe part extending along said main flow passage from the entrance, a bent part placed downstream from said first straight pipe part, a second straight pipe part placed downstream from the bent part and being provided with said thermal flow sensor placed on a wall face of said second straight pipe part, and an exit to said main flow passage placed downstream from said second straight pipe part, said second straight pipe part being formed in a bypass flow member which has an opening at one face of said straight pipe part, and the wall face being a portion of a plate which closes the opening of said bypass flow member and is provided with said thermal flow sensor; a first rectification member placed upstream from the entrance of said bypass flow passage in said main flow passage; and a second rectification member placed upstream from said thermal flow sensor in said second straight pipe part of said bypass flow passage, said second rectification member being held by said plate and said bypass flow member. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification