摘要:
An air flow measuring instrument, comprising: an auxiliary passage 8 arranged inside a main passage through which fluid flows, a tabular member 5 on which a pattern of a heating resistor for measuring an air flow is provided on one face 5a, the tabular member being disposed inside the auxiliary passage so that the one face 5a on which the heating resistor pattern of the tabular member is provided is disposed along a flow of fluid inside the auxiliary passage 8, a heating resistor pattern-side fluid passage 8a portion formed so that the fluid flows between the face 5a and a passage-forming surface 8d of the auxiliary passage, and a back-surface 8b side fluid passage portion formed so that fluid flows between a face 5b on a side opposite to the face of the tabular member and the passage-forming surface of the auxiliary passage. Guidance portion 13 guiding dust that collides against the end portion to back-surface side fluid passage portion 8b side is provided on upstream-side end of tabular member.
摘要:
An air flow measuring instrument, comprising: an auxiliary passage 8 arranged inside a main passage through which fluid flows, a tabular member 5 on which a pattern of a heating resistor for measuring an air flow is provided on one face 5a, the tabular member being disposed inside the auxiliary passage so that the one face 5a on which the heating resistor pattern of the tabular member is provided is disposed along a flow of fluid inside the auxiliary passage 8, a heating resistor pattern-side fluid passage 8a portion formed so that the fluid flows between the face 5a and a passage-forming surface 8d of the auxiliary passage, and a back-surface 8b side fluid passage portion formed so that fluid flows between a face 5b on a side opposite to the face of the tabular member and the passage-forming surface of the auxiliary passage. Guidance portion 13 guiding dust that collides against the end portion to back-surface side fluid passage portion 8b side is provided on upstream-side end of tabular member.
摘要:
A heating resistor type flow measuring device comprising a housing having a support part provided between a frame body and a connector and connected to the mounting part of a fluid passage, a flow rate detection element held on the frame body side of the housing, and an electronic circuit held on the housing and connected electrically to the flow rate detection element and the connector, wherein the electronic circuit is held on the frame body side of the housing and positioned in the fluid passage, a member with the rigidity higher than the material of the main structural member of the housing is formed integrally with the support part, the housing is fixed to the fluid passage through the member with high rigidity. A metal plate is inserted into the support part so as to increase rigidity. Further, a distance is provided between the support part and a metal plate forming a route for conducting the heat transferred to the metal base fixing an electronic circuit substrate by a plastic mold so as to form a structure obstructing a heat transfer, or a clearance is provided in a portion spaced by the plastic mold between the support part and the metal base so as to form a structure obstructing a heat transfer.
摘要:
A heating resistor type flow measuring device comprising a housing having a support part provided between a frame body and a connector and connected to the mounting part of a fluid passage, a flow rate detection element held on the frame body side of the housing, and an electronic circuit held on the housing and connected electrically to the flow rate detection element and the connector, wherein the electronic circuit is held on the frame body side of the housing and positioned in the fluid passage, a member with the rigidity higher than the material of the main structural member of the housing is formed integrally with the support part, the housing is fixed to the fluid passage through the member with high rigidity. A metal plate is inserted into the support part so as to increase rigidity. Further, a distance is provided between the support part and a metal plate forming a route for conducting the heat transferred to the metal base fixing an electronic circuit substrate by a plastic mold so as to form a structure obstructing a heat transfer, or a clearance is provided in a portion spaced by the plastic mold between the support part and the metal base so as to form a structure obstructing a heat transfer.
摘要:
A gas flow measuring apparatus includes a detecting element including a heating resistor and a thermo-sensitive resistor disposed on a diaphragm and external terminals connected to the heating resistor and the thermo-sensitive resistor, and a flow rate detecting unit which controls heating temperature of the heating resistor and which detects a flow rate of gas according to a change in a resistance value of the heating resistor or the thermo-sensitive resistor. The detecting element includes a resistor area in which the heating resistor and the thermo-sensitive resistor are formed and a fixed section area in which the external terminals are formed. A stress mitigating unit is formed between the resistor area and the fixed section area.
摘要:
An object of the present invention is to provide a structure which prevents a particulate contaminant and a liquid contaminant on which centrifugal separation hardly works, from arriving at a sensor element part. In order to attain the above described object, in a heat resistor type air flow rate measuring device which includes an auxiliary passage taking in a part of a fluid flowing in a main passage, and a plate-shaped sensor element installed in the aforesaid auxiliary passage and for detecting a flow rate of the fluid, and is a heat resistor type flow rate measuring device having an auxiliary passage formed along a curved line at 90° or more in an auxiliary passage portion at an upstream side from the plate-shaped sensor element, the aforesaid auxiliary passage is formed along a curved line at 90° or more on a phantom plane orthogonal to a sensor formation surface of the plate-shaped sensor element and parallel with a flow, and a sensor formation surface side and a rear side of the plate-shaped sensor element have gaps from an auxiliary passage wall surface.
摘要:
An object of the present invention is to provide a structure which prevents a particulate contaminant and a liquid contaminant on which centrifugal separation hardly works, from arriving at a sensor element part. In order to attain the above described object, in a heat resistor type air flow rate measuring device which includes an auxiliary passage taking in a part of a fluid flowing in a main passage, and a plate-shaped sensor element installed in the aforesaid auxiliary passage and for detecting a flow rate of the fluid, and is a heat resistor type flow rate measuring device having an auxiliary passage formed along a curved line at 90° or more in an auxiliary passage portion at an upstream side from the plate-shaped sensor element, the aforesaid auxiliary passage is formed along a curved line at 90° or more on a phantom plane orthogonal to a sensor formation surface of the plate-shaped sensor element and parallel with a flow, and a sensor formation surface side and a rear side of the plate-shaped sensor element have gaps from an auxiliary passage wall surface.
摘要:
A plate-shaped board is arranged so that fluid passages are respectively formed at a sensor-element mounting surface side of the plate-shaped board and at a backside surface side thereof being opposed to the sensor-element mounting surface side, a curved passage portion is provided which is located upstream of the plate-shaped board and changes its direction so as to form a curved line, and the curved passage portion has an outer-side wall surface including a sloping portion that slopes so that, of two edge portions of the outer-side wall surface in a direction perpendicular to board surfaces of the plate-shaped board, the edge portion located on a sidewall surface, facing the sensor-element mounting surface, of the curved passage portion is positioned closer to an inner wall surface of the curved passage portion than the edge portion located on a sidewall surface opposed to the first sidewall surface, along the sidewall surfaces.
摘要:
The invention is intended to improve reliability of a thermal type air flow measuring instrument employing a molded part formed by integral molding together with a metal plate. A slot or opening allowing only a resin to pass through the same is formed in the metal plate in an area or thereabout subjected to higher stresses. A part of connector terminals, which is not required from the intrinsic object, is disposed in the vicinity of a area where the resin has a larger thickness and the temperature difference between the inside and the outside of the resin is locally increased. An injecting direction is set so as to prevent a weld line and a void from being generated in a combined way. In the molded part with the metal plate inserted therein, the occurrence of cracks and an increase of the fatigue crack growth rate can be suppressed and reliability can be improved.
摘要:
A thermal type air flow measuring instrument has a molded part formed by integral molding with a metal plate. A slot or opening allowing only a resin to pass through the same is formed in the metal plate in an area subjected to higher stresses. A part of the connector terminals are disposed in the vicinity of an area where the resin has a larger thickness and the temperature difference between the inside and the outside of the resin is locally increased. The injecting direction is set to prevent a weld line and a void from being generated. For the molded part with the metal plate inserted therein, the occurrence of cracks is minimized. Further, an increase of the fatigue crack growth rate is decreased.