CN2771833Y - Diaphragm type air flow meter - Google Patents
Diaphragm type air flow meter Download PDFInfo
- Publication number
- CN2771833Y CN2771833Y CN 200520070180 CN200520070180U CN2771833Y CN 2771833 Y CN2771833 Y CN 2771833Y CN 200520070180 CN200520070180 CN 200520070180 CN 200520070180 U CN200520070180 U CN 200520070180U CN 2771833 Y CN2771833 Y CN 2771833Y
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- China
- Prior art keywords
- air flow
- air
- utility
- sensor head
- thin film
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Abstract
The utility model relates to a diaphragm type air flow meter which is suitable for measuring the flow of intake air of an internal combustion engine of a motor vehicle. The utility model comprises a machine body, an air channel arranged in the machine body, an air flow sensor arranged in the air channel and a drive circuit of the air flow sensor, wherein the air flow sensor comprises a bracket and a metal thin film sensor head arranged in the air channel and fixedly connected to one end of the bracket, wherein the metal thin film sensor head is formed by that a metal thin film is affixed and lined on a heat-insulating substrate and is processed into a gating shape. The utility model enhances the accuracy of the air flow value measured by the air flow meter, increases transient response property under the condition of the abrupt change of the air flow, reduces heat loss in the process of transferring, reduces the electric power consumption of an exothermic resistance element, the metal thin film sensor head is in contact with air in a flat plate type vertical face, the area is small, the sensor head can be kept clean and the service life of the sensor head can be increased.
Description
Technical field
The utility model relates to a kind of air flowmeter, is meant that especially a kind of measurement internal combustion engine of motor vehicle that is applicable to enters the diaphragm type air flowmeter of air mass flow.
Background technology
Usually, air flowmeter as the suction air capacity of the internal combustion engine of measured automobiles etc., be illustrated in figure 1 as the global sections figure of existing hot wire formula air flowmeter, heat release resistance and detect resistor chain with air intake opening that heat release resistance has a same structure and be listed in the branch road of body, the air major part of air intake opening is passed through from the main channel, and that part of air that distributes passes through from the branch road of air.When air mass flow changes, cause that the electric current that flows through heat release resistance also changes, take out a signal as heat release resistance and certain corresponding output electric signal of air mass flow by driving circuit, realize control to the fuel of internal combustion engine ratio.
But the heat release resistive element of this hot wire formula air flowmeter comprises a rich spool of being made by stupalith etc., as the platinum filament of heat release resistive element then with the coil form dish on this rich spool, on the platinum filament of rich lopping, be with glass material spare, the platinum filament of this lopping is connected on the lead, has supporter to support this rich spool and glass outer layer.Be used for heating the heat of the rich spool of this heat release resistive element itself, simultaneously also through should rich spool and lead reach on the supporter, these can not be ignored.Quicken the heated filament lost of life owing to exist this phenomenon can make the control circuit electric current increase, the big dirty easily air mass flow numerical precision that makes air flowmeter record of another thermal resistance vertical plane and air surface of contact reduces, will bring problem:, in automobile, fluctuation will take place as be in the condition of rapid acceleration or abrupt deceleration when automobile.
Summary of the invention
The utility model provides a kind of simple in structure, easy to use in order to solve the weak point that above-mentioned prior art exists, and the sensitivity that can improve air flow measurement, lowers the consumption electric power of heater, the diaphragm type air flowmeter of long service life.
For achieving the above object, the utility model adopts following scheme: a kind of diaphragm type air flowmeter, include body, be arranged on air duct in the body, be installed in the air flow sensor in the air duct and the driving circuit of air flow sensor, described air flow sensor includes support and places in the air duct and be fixedly connected on sensing metal film device head on support one end, wherein sensing metal film device head be by the attached lining of metallic film on heat-insulating substrate through being processed into palisade.
The utility model further is set to, and offers porosely with sensing metal film device head corresponding position on the described support, and the palisade of sensing metal film device head partly is in the scope in this hole.
The driving circuit of described air flow sensor is fixedly connected on the support.
The beneficial effects of the utility model are: the utility model is compared with original technology, by installing on the air flowmeter on the substrate that attached lining is insulating by metallic film through being processed into the sensing metal film device head that palisade forms, the hot-wire resistance that has replaced original technology, strengthened the degree of accuracy of the air mass flow numerical value that air flowmeter records, improved the transient response characteristic under the air mass flow sudden change, reduced the loss of heat in the process of transmitting, lowered the power consumption power of heat release resistive element, and sensing metal film device head is that flat vertical plane contacts with air, area is little, and making sensor head keep clean increases serviceable life.
Below in conjunction with embodiment and accompanying drawing the utility model is further specified.
Description of drawings
Fig. 1 is the whole sectional view of existing hot wire formula air flowmeter;
Fig. 2 is the utility model embodiment sectional view;
Fig. 3 is the utility model embodiment air flow sensor structural representation;
Fig. 4 is the utility model embodiment supporting structure synoptic diagram.
Embodiment
As Fig. 2, Fig. 3, shown in Figure 4, the utility model embodiment adopts a kind of diaphragm type air flowmeter, include body 1, be arranged on the air duct 11 in the body 1, be installed in the air flow sensor 2 in the air duct 11 and the driving circuit 3 of air flow sensor 2, described air flow sensor 2 includes support 21 and places in the air duct 11 and be fixedly connected on sensing metal film device head 22 on support 21 1 ends, and wherein sensing metal film device head 22 is the sensor heads that become palisade to form through Laser Processing on heat-insulating rectangular flat shape substrate 222 by metallic film 221 attached linings.
The utility model embodiment further is set to, offer porose 211 with sensing metal film device head 22 corresponding positions on the described support 21, the palisade of sensing metal film device head 22 partly is in the scope in this hole 211, makes sensing metal film device head 22 upper and lower surfaces can measure the flow of air.The driving circuit 3 of described air flow sensor 2 is fixedly connected on the support 21, and the terminal electrode 223 of sensing metal film device head 22 is connected with driving circuit 3.
The utility model embodiment embodiment: when the utility model is in duty, sensing metal film device head 22 is provided with a fixing temperature, when the air duct 11 of air in body 1 passes through sensing metal film device head 22, the temperature of sensing metal film device head 22 is changed, and the electric current that causes sensing metal film device head 22 changes, will export an output voltage that is directly proportional with air mass flow by the driving circuit 3 of air flow sensor 2, realize control the fuel of internal combustion engine ratio.
Claims (3)
1, a kind of diaphragm type air flowmeter, include body, be arranged on air duct in the body, be installed in the air flow sensor in the air duct and the driving circuit of air flow sensor, it is characterized in that: described air flow sensor includes support and places in the air duct and be fixedly connected on sensing metal film device head on support one end, wherein sensing metal film device head be by the attached lining of metallic film on heat-insulating substrate through being processed into palisade.
2, according to the described diaphragm type air flowmeter of claim 1, it is characterized in that: offer porosely with sensing metal film device head corresponding position on the described support, the palisade of sensing metal film device head partly is in the scope in this hole.
3, diaphragm type air flowmeter according to claim 1 and 2, it is characterized in that: the driving circuit of described air flow sensor is fixedly connected on the support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520070180 CN2771833Y (en) | 2005-03-23 | 2005-03-23 | Diaphragm type air flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520070180 CN2771833Y (en) | 2005-03-23 | 2005-03-23 | Diaphragm type air flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2771833Y true CN2771833Y (en) | 2006-04-12 |
Family
ID=36705624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520070180 Expired - Fee Related CN2771833Y (en) | 2005-03-23 | 2005-03-23 | Diaphragm type air flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2771833Y (en) |
-
2005
- 2005-03-23 CN CN 200520070180 patent/CN2771833Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060412 Termination date: 20140323 |