CN114739473A

CN114739473A - Air flow sensor for improving intake temperature monitoring and process thereof

Info

Publication number: CN114739473A
Application number: CN202210407456.4A
Authority: CN
Inventors: 朱邦海; 吴永斌; 吴进涛; 林敏�
Original assignee: Wenzhou Rongji New Energy Co ltd
Current assignee: Wenzhou Rongji New Energy Co ltd
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2022-07-12

Abstract

The application discloses an air flow sensor for improving intake temperature monitoring and a process thereof, wherein the air flow sensor comprises a shell, a plug, an air measuring flow channel and a communicating groove are arranged on the shell; a circuit board mounted on the housing through a circuit board placement groove; the ventilation flow channel penetrates through two ends of the circuit board and is communicated with the circuit board placing groove; the first temperature measuring element comprises a platinum wire resistor and a thermistor which are arranged in the wind measuring flow channel; and the second temperature measuring element is arranged in the ventilation flow channel, and in daily use, by adopting the technical scheme, according to the bridge balance principle, the temperature rise causes the same increment of the compensating element and the platinum wire resistor, and the balance state of the bridge cannot be influenced, so that the compensating element eliminates the influence of the air temperature on the flow measurement value.

Description

Air flow sensor for improving intake temperature monitoring and process thereof

Technical Field

The invention relates to an air flow sensor for improving intake air temperature monitoring and a process thereof.

Background

An air flow sensor, also called an air flow meter, is one of the important sensors of an electronic fuel injection engine. The air flow sensor converts the sucked air flow into an electric signal and sends the electric signal to an Electronic Control Unit (ECU) as one of basic signals for determining oil injection, and at present, the air flow sensor is a key component in an electronic control system of an automobile engine and is used for monitoring the mass flow of the air inlet of the engine; at present, in the prior art, whether the ambient temperature influences monitoring data or not is not considered in working environments, so that the detected data error is large, and the stability of components is poor due to the influence of the air duct temperature, so that the hot film elements on the wind measuring element placing frame are influenced through a main board element circuit, and further the distortion of the detected air flow detection data is caused; the key point is that the platinum wire resistor in the prior art is arranged in front of the compensation element, and because the temperature of the platinum wire resistor is high, the gas temperature is increased secondarily when the gas passes through the thermal field area of the platinum wire resistor, so that the resistance value of the compensation element is increased and distorted, the resistance value of the platinum wire resistor is unequal to that of the compensation element, and the bridge is unbalanced. There is thus a need for improvement.

Disclosure of Invention

The present invention is directed to solving one of the technical problems of the prior art.

The present application provides an air flow sensor with improved intake air temperature monitoring, comprising:

the casing is provided with a plug, a wind measuring flow passage and a communicating groove;

a circuit board mounted on the housing through a circuit board placement groove;

the ventilation flow channel penetrates through two ends of the circuit board and is communicated with the circuit board placing groove;

the first temperature measuring element is arranged in the wind measuring flow channel;

a second temperature sensing element mounted in the ventilation flow passage.

The first temperature sensing element includes:

the platinum wire resistor is arranged in the wind measuring flow channel and is electrically connected with the circuit board;

a thermistor installed in the anemometry flow channel.

The resistance value of the platinum wire resistor is 20R, and the resistance value of the thermistor is 1000R.

Simultaneously, a manufacturing process of the air flow sensor for improving intake temperature monitoring is disclosed, which is characterized by comprising the following steps:

s1, sequentially pouring polyamide, polyaryletherketone, fluororesin and alkyd resin into crushing and screening equipment, crushing until the diameter of the polyamide, polyaryletherketone, fluororesin and alkyd resin can pass through a 180-mesh screen, uniformly collecting the polyamide, putting the polyamide and the alkyd resin and the mineral essential oil organic solvent into stirring equipment together, and stirring at the rotation speed of 400-500r/min for 20-30min to obtain a mixed base material;

s2, respectively putting chromium methacrylate chloride, n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 1, 3-tri (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, a composite anticorrosive agent and a reinforcing filler into a stirring device in which the mixed base material obtained in the step S1 is located, and stirring at the rotating speed of 530r/min for 36min to obtain an anticorrosive modified base material;

s3, respectively adding the nucleating agent and the defoaming agent into stirring equipment in which the anticorrosion modified base material is located, and stirring for 2 hours at the rotating speed of 850r/min until the mixed material is pasty, thereby obtaining engineering plastic slurry;

s4, extruding, cutting and granulating the engineering plastic slurry obtained in the step S3 through a screw extruder to obtain an engineering plastic raw material;

s5, manufacturing the engineering plastic raw material into a shell by an injection molding method;

wherein the raw materials comprise the following components in parts by weight: 8 parts of polyamide, 5 parts of polyaryletherketone, 13 parts of fluororesin, 17 parts of alkyd resin, 4 parts of chromium chloride methacrylate, 5 parts of n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 3 parts of 1,1, 3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 2 parts of a composite preservative agent, 1 part of a nucleating agent, 3 parts of a defoaming agent, 2 parts of a reinforcing filler and 4 parts of a mineral essential oil organic solvent.

Also disclosed is a crushing and screening device, which comprises:

the bottom of the machine body is provided with a discharge hole, and the top of the machine body is provided with a feed hopper;

the crushing device is arranged in the machine body and connected with the feed hopper for crushing materials;

and the screening device is arranged in the machine body and is used for screening the crushed materials.

The crushing device comprises:

the crushing bin is arranged in the machine body, and the top of the crushing bin is communicated with the feed hopper;

a pair of pulverizing rollers installed in the pulverizing bin in a rolling manner in opposition to each other;

the grinding chamber is arranged at the bottom of the inner cavity of the crushing bin, and the top of the grinding chamber is open;

a grinding block rotatably mounted within the grinding chamber;

a driving unit for providing a rotational driving force to the grinding block and the pair of pulverizing rollers.

The driving unit includes:

a pair of gears which are respectively installed at the end parts of the crushing rollers and are meshed with each other;

the motor I is used for driving one crushing roller to rotate;

the transmission shaft is rotatably arranged at the bottom of the crushing bin;

a belt for drivingly connecting one of the pulverizing rollers to the drive shaft;

a worm mounted on the drive shaft;

one end of the linkage shaft is fixedly connected with the grinding block, and the other end of the linkage shaft is in transmission connection with the worm through the worm wheel;

and the discharge port penetrates through the bottom of the crushing bin from top to bottom.

The screening device includes:

the fixed cylinder is fixedly arranged in the machine body and sleeved outside the crushing bin;

the plurality of longitudinal grooves are uniformly arranged on the side wall of the fixed cylinder at intervals;

the movable cylinder is rotatably sleeved on the outer side of the fixed cylinder, and a plurality of transverse grooves are formed in the outer wall of the movable cylinder at intervals;

the fluted disc is arranged at one end of the peripheral wall of the movable cylinder;

and the output end of the second motor is provided with a transmission gear meshed with the fluted disc.

Further comprising:

the turning hopper is movably arranged on the inner peripheral side of the fixed cylinder;

the shovel plate is arranged on one side of the material turning hopper;

a return hopper communicated with the crushing device;

and the planetary gear transmission unit is used for enabling the turning hopper to rotate together with the movable cylinder.

Further comprising:

and the anti-overflow cover is arranged between the discharge port and the discharge end of the screening device.

The invention has the following main beneficial effects:

1. according to the bridge balance principle, the temperature rise causes the same increment of the compensation element and the platinum wire resistor, and the balance state of the bridge cannot be influenced, so that the compensation element eliminates the influence of the air temperature on the flow value;

2. by adopting the nontoxic antioxidant reagent and the anticorrosive composite reagent, the corrosion resistance of the shell is obviously improved, the oxidation resistance and the cavitation resistance of the shell can be realized, the service life of the shell is prolonged, and the shell is not easy to corrode and damage;

3. through the arrangement of the grinding bin, the second motor, the first motor, the pair of gears, the pair of grinding rollers, the grinding chamber, the belt, the transmission shaft, the worm wheel, the worm, the grinding block, the discharge opening, the fixed cylinder, the fluted disc, the transmission gear, the movable cylinder, the longitudinal groove, the transverse groove, the planetary transmission unit, the turning hopper and the shovel plate, the materials are ground and crushed for many times, and the grinding and crushing effects and the grinding speed of the materials are improved.

Drawings

FIG. 1 is a schematic diagram of an airflow sensor configured to improve intake air temperature monitoring in accordance with an embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of an airflow sensor for improved intake air temperature monitoring in accordance with an embodiment of the present application;

FIG. 3 is a schematic diagram of an internal structure of a crushing and screening device according to an embodiment of the present application;

FIG. 4 is a schematic cross-sectional view taken along the line A-A in FIG. 3;

fig. 5 is a schematic structural diagram of a crushing roller of a crushing and screening device according to an embodiment of the present application.

Reference numerals

101-shell, 102-wind measuring flow channel, 103-communicating groove, 104-circuit board, 105-ventilation flow channel, 106-second temperature measuring element, 107-platinum wire resistor, 108-thermistor, 201-machine body, 202-discharge hole, 203-feed hopper, 301-crushing bin, 302-crushing roller, 303-grinding chamber, 304-grinding block, 401-gear, 402-motor I, 403-transmission shaft, 404-belt, 405-worm, 406-linkage shaft, 407-discharge hole, 501-fixed cylinder, 502-longitudinal groove, 503-movable cylinder, 504-fluted disc, 505-motor II, 506-turning hopper, 507-shovel plate, 508-returning hopper and 509-overflow preventing cover.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived from the embodiments in the present application by a person skilled in the art, are within the scope of protection of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application are capable of operation in sequences other than those illustrated or described herein, and that the terms "first," "second," etc. are generally used in a generic sense and do not limit the number of terms, e.g., a first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The server provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

As shown in fig. 1 to 5, an embodiment of the present application provides an airflow sensor for improving intake air temperature monitoring, which includes a housing 101, on which a plug, a wind measuring flow passage 102 and a communication groove 103 are provided; a circuit board 104 mounted on the housing 101 via a circuit board 104 placement groove; a ventilation flow passage 105 which penetrates both ends of the circuit board 104 and communicates with the placement groove of the circuit board 104; a first temperature measuring element installed in the anemometric flow path 102; a second temperature measuring element 106 mounted in the ventilation flow passage 105.

Further, the first temperature measuring element comprises a platinum wire resistor 107 which is arranged in the wind measuring flow channel 102 and electrically connected with the circuit board 104; and a thermistor 108 installed in the anemometer channel 102.

Preferably:

the resistance of the platinum wire resistor 107 was 20R, and the resistance of the thermistor 108 was 1000R.

Also disclosed is a process for manufacturing an air flow sensor with improved intake air temperature monitoring, comprising the steps of:

s1, sequentially pouring polyamide, polyaryletherketone, fluororesin and alkyd resin into crushing and screening equipment

After the mixture is crushed to a diameter capable of passing through a 180-mesh screen, uniformly collecting the mixture and putting the mixture and the mineral essential oil organic solvent into stirring equipment together, and stirring the mixture for 20 to 30 minutes at a rotating speed of 400-;

s2, respectively putting chromium methacrylate chloride, beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate, 1, 3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, a composite preservative agent and a reinforcing filler into a stirring device in which the mixed base material obtained in the step S1 is located, and stirring at a rotation speed of 530r/min for 36min to obtain a preservative modified base material;

s5, manufacturing the shell 101 from the engineering plastic raw material by an injection molding method;

Also discloses a crushing and screening device, which comprises a machine body 201, wherein the bottom of the machine body is provided with a discharge hole 202, and the top of the machine body is provided with a feed hopper 203; a crushing device installed in the machine body 201 and connected with the feed hopper 203 for crushing the material; and the screening device is arranged in the machine body 201 and used for screening the crushed materials.

Further, the crushing apparatus includes a crushing bin 301 installed in the machine body 201 and having a top portion communicating with the feed hopper 203, a pair of crushing rollers 302 installed in the crushing bin 301 in an opposed rolling manner; a grinding chamber 303 which is arranged at the bottom of the inner cavity of the crushing bin 301 and has an open top; a grinding block 304 rotatably mounted in the grinding chamber 303; a driving unit for providing a rotational driving force to the grinding block 304 and the pair of pulverizing rollers 302.

Further, the driving unit includes a pair of gears 401 which are respectively installed at the end portions of the respective pulverizing rollers 302 and engaged with each other; a first motor 402 for driving one of the crushing rollers 302 to rotate; a transmission shaft 403 which is rotatably installed at the bottom of the crushing bin 301; a belt 404 for drivingly connecting one of the crushing rollers 302 to the drive shaft 403; a worm 405 mounted on the drive shaft 403; one end of the linkage shaft 406 is fixedly connected with the grinding block 304, and the other end of the linkage shaft is in transmission connection with the worm 405 through a worm wheel; and the discharge opening 407 vertically penetrates through the bottom of the crushing bin 301.

Further, the screening device includes a fixed cylinder 501 fixedly installed in the machine body 201 and sleeved outside the crushing bin 301; a plurality of longitudinal grooves 502 which are uniformly arranged on the side wall of the fixed cylinder 501 at intervals; the movable cylinder 503 is rotatably sleeved outside the fixed cylinder 501, and a plurality of transverse grooves are formed in the outer wall of the movable cylinder at intervals; a toothed plate 504 mounted on one end of the outer peripheral wall of the movable cylinder 503; the output end of the second motor 505 is provided with a transmission gear 401 meshed with the fluted disc 504.

Further, the device also comprises a material turning hopper 506 which is movably arranged on the inner peripheral side of the fixed cylinder 501; a shovel plate 507 attached to the turning hopper 506 side; a return hopper 508 that communicates with the crushing apparatus; and a planetary gear transmission unit for rotating the hopper 506 together with the movable cylinder 503.

Further, a spill guard 509 is included and is mounted between the discharge port 202 and the discharge end of the screening apparatus.

In the basic embodiment of the present application, by adopting the above technical solution, the windfinding area has the platinum wire resistor 107 exposed to the intake air flow, and the ECM can heat the platinum wire resistor 107 to a specified temperature by applying a specified current to the platinum wire resistor 107. The intake air flow may cool the platinum wire resistor 107 and the thermistor 108, thereby changing their resistance values. To maintain a stable current value, the ECM varies the voltage applied to the platinum wire resistor 107 and thermistor 108. The voltage value is proportional to the air flow through the sensor and the ECM uses this value to calculate the intake air amount. The platinum wire resistor 107 and the thermistor 108 form a bridge circuit, the voltage difference between two ends of the bridge circuit is kept equal by controlling the transistors to maintain a preset temperature, when the intake air temperature rises, the resistance value of the platinum wire resistor 107 also rises, the resistance value of the compensating element is also higher, the compensating element with a reasonable resistance value is added, the compensating element and the part of the platinum wire resistor 107 with the increased resistance value caused by the temperature rise can be equal, according to the bridge balance principle, the temperature rise causes the same increment of the compensating element and the platinum wire resistor 107, the balance state of the bridge cannot be influenced, and therefore the compensating element eliminates the influence of the air temperature on the flow measurement value.

In the preferred embodiment of the present application, the corrosion resistance of the casing 101 is significantly improved by using the non-toxic antioxidant agent and adding the anti-corrosion composite agent, so as to achieve the purpose of improving the corrosion resistance of the casing 101 on the premise of no environmental pollution, achieve the purposes of oxidation resistance and cavitation resistance of the casing 101, improve the service life of the casing 101, and prevent the casing 101 from being corroded and damaged.

In the preferred embodiment of the present application, large particle materials are put into the feed hopper 203, enter the crushing bin 301 through the feed hopper 203, the second motor 505 and the first motor 402 operate simultaneously, the pair of crushing rollers 302 rotate oppositely under the cooperation of the pair of gears 401 to crush and crush the large particle materials falling into the crushing bin 301, the crushed materials fall into the grinding chamber 303, the transmission shaft 403 rotates with the crushing rollers 302 under the action of the belt 404 along with the operation of the first motor 402, the grinding block 304 rotates in the grinding chamber 303 under the cooperation of the worm gear and the worm 405, the materials fall between the side wall of the grinding block 304 and the side wall of the grinding chamber 303, the materials are ground into fine particles along with the rotation of the grinding block 304, the crushing bin 301 is discharged from the discharge port 407 and falls into the fixed cylinder 501, the movable cylinder 503 rotates outside the fixed cylinder 501 through the cooperation of the fluted disc 504 and the transmission gear 401, the plurality of longitudinal grooves 502 and the plurality of transverse grooves move alternately to form a scissor effect, the widths of the longitudinal grooves 502 and the transverse grooves are not more than the required particle diameter, for convenience of display, the widths of the transverse grooves and the wide grooves shown in the drawing are larger, the planetary transmission unit comprises a sun gear fixedly connected with a material turning hopper 506, a gear ring arranged on the inner side of a movable cylinder 503 and a planet gear rotatably arranged at the end part of the fixed cylinder 501 and meshed with the sun gear and the gear ring, when the movable cylinder 503 rotates, the planetary transmission unit drives the material turning hopper 506 to rotate along the circumferential direction of the inner wall of the fixed cylinder 501, so as to scoop up the materials accumulated at the bottom of the inner wall of the fixed cylinder 501 and move towards the upper part of the fixed cylinder 501, in the process, the materials shoveled on the material turning hopper 506 are gradually accumulated at the corner between a shovel plate 507 and the material turning hopper 506, the materials at the corner between the shovel plate 507 and the material turning hopper 506 fall into a material returning hopper 508 along with the turning of the material turning hopper 506 continuously turning over on the inner wall of the fixed cylinder 501, and fall to the bottom of the fixed cylinder 501 after being crushed and ground again by a crushing roller 302 and a grinding block 304, the materials passing through the transverse groove and the longitudinal groove 502 fall into the discharge port 202 at the bottom of the machine body 201 and are discharged out of the machine body 201 through the discharge port 202.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An airflow sensor for improved intake air temperature monitoring, comprising:

the wind measuring device comprises a shell (101) which is provided with a plug, a wind measuring flow channel (102) and a communicating groove (103);

a circuit board (104) mounted on the housing (101) through a circuit board (104) placement slot;

the ventilation flow channel (105) penetrates through two ends of the circuit board (104) and is communicated with the placement groove of the circuit board (104);

a first temperature measuring element mounted in the anemometric channel (102);

a second temperature measuring element (106) mounted in the ventilation flow channel (105).

2. The airflow sensor for improved intake air temperature monitoring of claim 1 wherein said first temperature sensing element comprises:

the platinum wire resistor (107) is arranged in the wind measuring flow channel (102) and is electrically connected with the circuit board (104);

a thermistor (108) mounted in the anemometry flow channel (102).

3. An airflow sensor for improved intake air temperature monitoring according to claim 2, wherein:

the resistance value of the platinum wire resistor (107) is 20R, and the resistance value of the thermistor (108) is 1000R.

4. A process for manufacturing an airflow sensor adapted for improved intake air temperature monitoring as claimed in claim 3, comprising the steps of:

s5, manufacturing the engineering plastic raw material into a shell (101) by an injection molding method;

5. A comminution screening device as claimed in claim 4, which includes:

the device comprises a machine body (201), a discharge hole (202) is formed in the bottom of the machine body, and a feed hopper (203) is formed in the top of the machine body;

the crushing device is arranged in the machine body (201) and connected with the feed hopper (203) for crushing materials;

the screening device is arranged in the machine body (201) and used for screening the crushed materials.

6. A crushing screening device according to claim 5, characterized in that the crushing screening device comprises:

a crushing bin (301) which is arranged in the machine body (201) and the top of which is communicated with a feed hopper (203);

a pair of pulverizing rollers (302) that are mounted in the pulverizing bin (301) in a rolling manner so as to be opposed to each other;

a grinding chamber (303) which is arranged at the bottom of the inner cavity of the crushing bin (301) and is open at the top;

a grinding block (304) rotatably mounted within the grinding chamber (303);

a drive unit for providing a rotational drive force to the grinding block (304) and the pair of pulverizing rollers (302).

7. The crushing screening device according to claim 6, wherein the driving unit includes:

a pair of gears (401) which are respectively installed at the end parts of the crushing rollers (302) and are meshed with each other;

a first motor (402) for driving one of the crushing rollers (302) to rotate;

a transmission shaft (403) rotatably mounted at the bottom of the crushing bin (301);

a belt (404) for drivingly connecting one of the crushing rollers (302) to the drive shaft (403);

a worm (405) mounted on the drive shaft (403);

one end of the linkage shaft (406) is fixedly connected with the grinding block (304), and the other end of the linkage shaft is in transmission connection with the worm (405) through a turbine;

and the discharge port (407) vertically penetrates through the bottom of the crushing bin (301).

8. A comminution screening device as claimed in claim 5, which includes:

the fixed cylinder (501) is fixedly arranged in the machine body (201) and sleeved outside the crushing bin (301);

the plurality of longitudinal grooves (502) are uniformly arranged on the side wall of the fixed cylinder (501) at intervals;

the movable cylinder (503) is sleeved outside the fixed cylinder (501) in a rotating mode, and a plurality of transverse grooves are formed in the outer wall of the movable cylinder at intervals;

a toothed disc (504) mounted on one end of the outer peripheral wall of the movable cylinder (503);

and the output end of the second motor (505) is provided with a transmission gear (401) meshed with the fluted disc (504).

9. The crushing screening device of claim 8, further comprising:

a hopper (506) movably mounted on the inner peripheral side of the fixed cylinder (501);

a shovel plate (507) installed on one side of the hopper (506);

a return hopper (508) in communication with the crushing device;

a planetary gear transmission unit for rotating the tipping bucket (506) together with the movable cylinder (503).

10. A pulverizing and screening apparatus as defined in any one of claims 5 to 9, further comprising:

an overflow prevention shroud (509) mounted between the discharge outlet (202) and a screening device discharge end.