CN219015368U

CN219015368U - Pressure sensor for intake manifold

Info

Publication number: CN219015368U
Application number: CN202223450306.6U
Authority: CN
Inventors: 陈旖雯; 朱荣惠
Original assignee: Wuxi Huayang Science And Technology Co ltd
Current assignee: Wuxi Huayang Science And Technology Co ltd
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2023-05-12
Anticipated expiration: 2032-12-22

Abstract

The utility model relates to the technical field of sensors, in particular to a pressure sensor for an air inlet manifold, which comprises a shell and an upper cover which can be matched with each other, wherein the shell comprises an air tap with an air passage, a plug with a pin chamber and an assembly chamber formed by the upper cover after being matched with each other; the assembly cavity is internally provided with a contact pin and a PCBA board, and the PCBA board is connected with a pressure chip; the contact pin comprises a contact pin inserting part, a contact pin supporting part and a contact pin connecting part; the contact pin inserting part is arranged in the contact pin chamber, the contact pin supporting part is embedded in the shell, and the contact pin connecting part is arranged in the assembly chamber; an NTC probe is embedded in the air passage, and the NTC probe is connected with the contact pin connecting part. The device has simple structure, and each part adopts modularized design, so that the device is easy to assemble and has high air tightness; the accuracy of pressure and temperature measurement of the sensor can be effectively improved while the processing cost is reduced.

Description

Pressure sensor for intake manifold

Technical Field

The utility model relates to the technical field of sensors, in particular to a pressure sensor for an intake manifold.

Background

The intake pressure sensor is connected with the intake manifold through a vacuum tube, senses the vacuum change in the intake manifold along with different rotational speed and load of the engine, and converts the vacuum change into a voltage signal from the change of the internal resistance of the sensor so as to enable the ECU to correct the fuel injection quantity and the ignition timing angle.

The intake pressure sensor detects the absolute pressure of the intake manifold behind the throttle valve, detects the change of the absolute pressure in the manifold according to the rotation speed and the load of the engine, and then converts the change into signal voltage to be sent to an Engine Control Unit (ECU), and the ECU controls the magnitude of the basic fuel injection quantity according to the magnitude of the signal voltage.

Therefore, the absolute pressure and the temperature value of the intake manifold are accurately mastered, and the accurate control of the fuel injection quantity of the automobile can be realized. The existing sensor for monitoring the absolute pressure and temperature value of the intake manifold has the problems of complex structure and poor air tightness, so that the production cost of the pressure sensor is increased, and the use effect is not ideal.

Therefore, a new technical solution is urgently needed to solve the above technical problems.

Disclosure of Invention

The utility model aims to solve the problems of the prior art, and provides a pressure sensor for an intake manifold, which is used for solving the technical problems of complex structure, poor air tightness, increased production cost and unsatisfactory use effect of the traditional sensor.

The above purpose is realized by the following technical scheme:

the pressure sensor for the intake manifold comprises a shell and an upper cover which can be matched with each other, wherein the shell comprises an air tap with an air passage, a plug with a pin chamber and an assembling chamber formed by the upper cover after being matched with each other; the assembly cavity is internally provided with a contact pin and a PCBA board, and the PCBA board is connected with a pressure chip; the contact pin comprises a contact pin inserting part, a contact pin supporting part and a contact pin connecting part; the contact pin inserting part is arranged in the contact pin chamber, the contact pin supporting part is embedded in the shell, and the contact pin connecting part is arranged in the assembly chamber; an NTC probe is embedded in the air passage, and the NTC probe is connected with the contact pin connecting part.

Further, the number of the pins is 4, and the pins comprise a first pin, a second pin, a third pin and a fourth pin; the pin connection part of the first pin is respectively connected with the PCBA and the NTC probe; the pin connection part of the second pin is connected with the NTC probe, and the pin connection parts of the third pin and the fourth pin are respectively connected with the PCBA board.

Further, a pin groove is further formed in the bottom wall of the assembly chamber, and the pin groove can accommodate the pin connection portions of the first pin and the second pin and is sealed through glue.

Further, a plurality of hot riveting columns are arranged in the assembly cavity, and correspondingly, a plurality of positioning holes capable of being sleeved with the hot riveting columns are formed in the PCBA board, so that the PCBA board is riveted with the hot riveting columns through hot riveting.

Further, the pressure chip is arranged on the lower side of the PCBA board, and a sealing gasket with a through hole is arranged between the air passage and the pressure chip.

Further, a gasket groove is formed in the bottom wall of the assembly chamber, and the gasket groove is used for embedding the sealing gasket.

Further, a clamping groove capable of clamping the upper cover is formed in the inner wall corresponding to the top opening of the assembly cavity, an arc-shaped step is formed in the top edge of the upper cover, a sealing groove is formed between the arc-shaped step and the clamping groove, and sealing glue is filled in the sealing groove.

Further, a hollowed-out sleeve is arranged at the end part of the air tap, and the head part of the NTC probe is arranged in the hollowed-out sleeve.

Further, an annular groove is formed in the outer wall of the air faucet, and a 0-shaped ring is arranged in the annular groove.

Advantageous effects

The pressure sensor for the intake manifold has a simple structure, and each part adopts a modularized design, so that the pressure sensor is easy to assemble and high in air tightness; the accuracy of pressure and temperature measurement of the sensor can be effectively improved while the processing cost is reduced.

Drawings

FIG. 1 is a perspective view of a pressure sensor for an intake manifold according to the present utility model;

FIG. 2 is a cross-sectional view of a pressure sensor for an intake manifold according to the present utility model;

FIG. 3 is a top view of a pressure sensor for an intake manifold according to the present utility model;

FIG. 4 is a schematic view of a pin connection structure of a pressure sensor for an intake manifold according to the present utility model;

fig. 5 is an exploded view of a pressure sensor for an intake manifold according to the present utility model.

Illustration of the graphic indicia:

1-shell, 2-upper cover, 3-air flue, 4-air cock, 5-contact pin cavity, 6-plug, 7-assembly cavity, 8-contact pin, 9-PCBA board, 10-pressure chip, 11-NTC probe, 12-contact pin recess, 13-hot rivet post, 14-locating hole, 15-sealing gasket, 16-gasket recess, 17-clamping groove, 18-arc ladder, 19-seal groove, 20-sealant, 21-fretwork cover, 22-annular, 23-O type circle, 24-contact pin grafting portion, 25-contact pin supporting portion, 26-contact pin connecting portion, 27-first contact pin, 28-second contact pin, 29-third contact pin, 30-fourth contact pin.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. The described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1, 2 and 5, a pressure sensor for an intake manifold comprises a housing 1 and an upper cover 2 which can be mutually matched, wherein the housing 1 comprises an air tap with an air passage 3, a plug 6 with a pin chamber 5 and an assembling chamber 7 formed by matching the upper cover 2; a PCBA plate 9 and a plurality of pins 8 are arranged in the assembly chamber 7, and a pressure chip 10 is connected to the PCBA plate 9; an NTC probe 11 is also embedded in the air passage 3; the NTC probe 11 is connected to a part of the pins 8.

Specifically, in this embodiment, the absolute pressure of the intake manifold behind the throttle valve is measured by the pressure chip 10, the temperature of the intake manifold behind the throttle valve is measured by the NTC probe, the change of the absolute pressure gauge temperature in the manifold is detected according to the engine speed and the load, and then the absolute pressure gauge temperature is converted into a signal voltage to be sent to an Engine Control Unit (ECU), and the ECU controls the magnitude of the basic fuel injection amount according to the magnitude of the signal voltage.

As shown in fig. 4, the pin 8 includes a pin insertion portion 24, a pin supporting portion 25, and a pin connecting portion 26; the pin inserting portion 24 is disposed in the pin chamber 5, the pin supporting portion 25 is embedded in the housing 1, and the pin connecting portion 26 is disposed in the assembly chamber 7.

Specifically, the number of pins 8 is 4, including a first pin 27, a second pin 28, a third pin 29 and a fourth pin 30; the pin connection portion 26 of the first pin 27 is connected to the PCBA board 9 and the NTC probe 11, respectively; the pin connection portion 26 of the second pin 28 is connected to the NTC probe 11, and the pin connection portions 26 of the third pin 29 and the fourth pin 30 are connected to the PCBA board 9, respectively.

A pin groove 12 is further formed in the bottom wall of the assembly chamber 7, and the pin groove 12 can accommodate the pin connection portions 26 of the first pin 27 and the second pin 28 and is sealed and fixed by glue.

As a connection form between the PCBA plate 9 and the housing 1 in this embodiment, a plurality of rivet hot posts 13 are disposed in the assembly chamber 7, and correspondingly, a plurality of positioning holes 14 capable of being sleeved with the rivet hot posts 13 are formed in the PCBA plate 9, so that the PCBA plate 9 and the rivet hot posts 13 are riveted through rivet hot.

As shown in fig. 3, in this embodiment, the pressure chip 10 is disposed on the underside of the PCBA board 9, and a sealing gasket 15 with a through hole is disposed between the air passage 3 and the pressure chip 10; a gasket groove 16 is formed in the bottom wall of the assembly chamber 7, and the gasket groove 16 is used for embedding the sealing gasket 15.

Specifically, the sealing gasket 15 seals the air passage with the bottom of the pressure chip 10, so that the air pressure flowing in the air passage acts on the pressure chip 10, and accurate measurement is achieved.

As an optimization of the housing 1 and the upper cover 2 in this embodiment, a clamping groove 17 capable of clamping the upper cover 2 is formed in an inner wall corresponding to the top opening of the assembly chamber 7, an arc-shaped step 18 is formed in the top edge of the upper cover 2, a sealing groove 19 is formed between the arc-shaped step 18 and the clamping groove 17, and sealing glue is filled in the sealing groove 19. The glue filling and sealing scheme is adopted, and the glue can completely meet the environmental and sealing requirements of the product.

As the assembly optimization of the upper cover 2 and the housing 1 in the embodiment, the final assembly process is to glue the upper cover 2 and the housing 1, and cure the upper cover 2 and the housing 1, and a sealed cavity is formed inside the upper cover 1 and the housing 2 after the glue is dispensed. When the upper cover 2 is designed, an air outlet hole communicated with the outside is formed, and air expanded by heating in the glue curing process is discharged out of the cavity through the air outlet hole, otherwise, the sealing performance is affected due to the fact that the gland is tilted due to expansion of the heated air.

In order to facilitate accurate measurement of the NTC probe 11, ensure that the NTC probe 11 is exposed to the environment to be measured as much as possible and is not easily damaged by external shock, in this embodiment, a hollowed-out sleeve 21 is disposed at the end of the air tap 4, and the head of the NTC probe 11 is disposed in the hollowed-out sleeve 21.

In order to facilitate the air tap 4 to form a seal with the inner wall of the intake manifold, in this embodiment, an annular groove 22 is provided on the outer wall of the air tap 4, and a 0-shaped ring 23 is provided in the annular groove 22.

The above description is for the purpose of illustrating the embodiments of the present utility model and is not to be construed as limiting the utility model, but is intended to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principle of the utility model.

Claims

1. The pressure sensor for the intake manifold is characterized by comprising a shell and an upper cover which can be matched with each other, wherein the shell comprises an air tap with an air passage, a plug with a pin chamber and an assembling chamber formed by the upper cover after being matched with each other; the assembly cavity is internally provided with a contact pin and a PCBA board, and the PCBA board is connected with a pressure chip; the contact pin comprises a contact pin inserting part, a contact pin supporting part and a contact pin connecting part; the contact pin inserting part is arranged in the contact pin chamber, the contact pin supporting part is embedded in the shell, and the contact pin connecting part is arranged in the assembly chamber; an NTC probe is embedded in the air passage, and the NTC probe is connected with the contact pin connecting part.

2. The pressure sensor for an intake manifold of claim 1, wherein the number of pins is 4, including a first pin, a second pin, a third pin, and a fourth pin; the pin connection part of the first pin is respectively connected with the PCBA and the NTC probe; the pin connection part of the second pin is connected with the NTC probe, and the pin connection parts of the third pin and the fourth pin are respectively connected with the PCBA board.

3. A pressure sensor for an intake manifold as claimed in claim 2, wherein a pin recess is further provided in the bottom wall of the assembly chamber, the pin recess being adapted to receive the pin connection portions of the first pin and the second pin and being sealed by glue.

4. The pressure sensor for an intake manifold of claim 1, wherein a plurality of heat staking posts are disposed in the assembly chamber, and a plurality of positioning holes are correspondingly formed in the PCBA plate and are capable of being sleeved with the heat staking posts, and the PCBA plate is riveted with the heat staking posts by heat staking.

5. A pressure sensor for an intake manifold as claimed in claim 1, wherein the pressure die is provided on the underside of the PCBA plate, a sealing gasket with a through hole being provided between the air passage and the pressure die.

6. A pressure sensor for an intake manifold as recited in claim 5, wherein a gasket groove is formed in a bottom wall of the assembly chamber, the gasket groove being configured to receive the sealing gasket.

7. The pressure sensor for an intake manifold of claim 1, wherein a clamping groove capable of clamping the upper cover is formed in the inner wall corresponding to the top opening of the assembly chamber, an arc-shaped step is formed in the top edge of the upper cover, a sealing groove is formed between the arc-shaped step and the clamping groove, and sealing glue is filled in the sealing groove.

8. The pressure sensor for an intake manifold of claim 1, wherein the end of the air tap is provided with a hollowed-out sleeve, and the head of the NTC probe is disposed in the hollowed-out sleeve.

9. The pressure sensor for an intake manifold of claim 1, wherein the outer wall of the air tap is provided with a circumferential groove, and wherein a 0-ring is disposed in the circumferential groove.