CN210293530U

CN210293530U - Pressure sensor assembly

Info

Publication number: CN210293530U
Application number: CN201921011331.XU
Authority: CN
Inventors: 唐玉豪; 梁厚勋; 段红军
Original assignee: Shanghai Wenxiang Automotive Sensors Co Ltd
Current assignee: Shanghai Wenxiang Automotive Sensors Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-04-10
Anticipated expiration: 2029-06-28

Abstract

The utility model provides a pressure sensor subassembly for detect the pressure of vehicle fuel tank, pressure sensor subassembly includes shell, printed circuit board, pressure sensor and upper cover. The housing has a seal groove. The pressure sensor is installed between one side of the printed circuit board and the sealing groove, and at least one part of the pressure sensor is bonded with the sealing groove. The upper cover is abutted against the other side of the printed circuit board.

Description

Pressure sensor assembly

Technical Field

The utility model mainly relates to the automotive electronics field especially relates to a pressure sensor subassembly.

Background

A pressure sensor assembly is arranged in a vehicle fuel tank assembly of an automobile and used for detecting the evaporation pressure of the vehicle fuel tank, the difference value is converted into an analog voltage signal after being amplified, conditioned and subjected to digital-to-analog conversion according to the difference value between the evaporation pressure value of the fuel tank and the external atmospheric pressure, and the analog voltage signal is sent to an Electronic Control Unit (ECU) of the automobile and further serves as one of the references of the subsequent work of the ECU.

Fig. 1 is a schematic structural diagram of a conventional pressure sensor assembly. As shown in fig. 1, the pressure sensor assembly 100 includes an upper cover 110, a screw 120, a printed circuit board 130, a pressure sensor 140, a rectangular sealing ring 150, and a housing 160, which are connected in this order. The pressure sensor 140 is assembled on the printed circuit board 130, and the printed circuit board 130 assembled with the pressure sensor 140 is locked and fixed on the casing 160 through the screw 120, the rectangular sealing ring 150 is placed between the casing 160 and the pressure sensor 140, and the rectangular sealing ring 150 is used for meeting the sealing requirement of the joint of the pressure sensor 140 and the casing 160. The upper cover 110 is engaged with the housing 160 by a hooking structure for fixing the pressure sensor 140 and the printed circuit board 130 between the upper cover 110 and the housing 160. Upon receiving the pressure signal, the pressure sensor 140 inputs the pressure signal to the ECU through the pin 170. The pins 170 are connected to the printed circuit board 130 through a soldering process.

Fig. 2 is a partial structural diagram of an exterior of a conventional pressure sensor assembly. As shown in fig. 2, the pressure sensor assembly 100 is secured to a fuel tank pressure sensor assembly conduit 10. The pressure sensor assembly 100 is retained by the retaining support posts 180 to effect sealing of the pressure sensor assembly 100. The limiting support column 180 locks the printed circuit board 130 (the printed circuit board 130 is located inside the pressure sensor assembly 100, not shown in fig. 2, see fig. 1) to the housing by a screw, and an outer sealing ring 190 is arranged on the pipe 10, and the outer sealing ring 190 is used for achieving the sealing connection of the pipe 10 and a fuel tank pipe (not shown in fig. 2).

The assembly structure of the existing pressure sensor assembly, as described above, has the following disadvantages:

(1) the shell and the pressure sensor are sealed through the rectangular sealing ring, the rectangular sealing ring needs to be pressed and deformed to realize sealing after the printed circuit board is locked by the screw, and therefore the rectangular sealing ring can generate a reverse acting force on the pressure sensor due to the pressed deformation. Because the installation torsion of each screw is difficult to control to the same value when processing in the production process, the reaction force that leads to pressure sensor in same batch different products to receive is different, therefore the voltage signal deviation of pressure sensor output is great, and the precision is not high.

(2) The assembly of the existing pressure sensor assembly needs to use screws, the assembly of the screws consumes working hours, and certain product working hours and material cost are needed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pressure sensor subassembly can realize pressure sensor and printed circuit board's sealed requirement, improves the precision that pressure sensor detected.

In an embodiment of the invention, the housing has one or more sealing grooves.

In an embodiment of the present invention, the one or more sealing grooves are symmetrically arranged along a center line of the pressure sensor.

In an embodiment of the present invention, at least a portion of the pressure sensor is disposed in the sealing groove.

In an embodiment of the present invention, the upper cover includes an upper cover protrusion, and the upper cover protrusion abuts against the other side of the printed circuit board.

In an embodiment of the present invention, the housing further includes a supporting step, and the printed circuit board is fixed between the supporting step and the upper cover.

In an embodiment of the present invention, the housing further includes a glue storage groove, and the upper cover is bonded to the glue storage groove.

The utility model discloses an in the embodiment, the shell still includes the inlet vent, waterproof ventilated membrane is attached inlet vent bottom mouth communicates to the inside of shell.

In an embodiment of the present invention, the pressure sensor is mounted on the printed circuit board by surface mount technology.

In an embodiment of the present invention, the outer seal ring is further disposed on the outer shell, and the outer seal ring is used for sealing a joint between the outer shell and the fuel tank pipeline of the vehicle.

Compared with the prior art, the utility model discloses cancelled the fixed knot of screw, rectangle sealing washer and constructed, subtracted the influence to product output precision that the screw equipment produced, simplified assembly process, reduced the material cost and the processing cost of product.

Drawings

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein:

fig. 1 is a schematic view of an internal structure of a conventional pressure sensor module.

Fig. 2 is a partial structural diagram of an exterior of a conventional pressure sensor module.

Fig. 3A is a schematic diagram of an internal structure of a pressure sensor assembly according to an embodiment of the present invention.

Fig. 3B is an enlarged schematic view of the internal structure of the pressure sensor assembly in fig. 3A.

Fig. 4A is a schematic structural diagram of the pressure sensor assembly in fig. 3A from another view angle.

FIG. 4B is a detailed schematic view of the upper cover protrusion of the pressure sensor assembly of FIG. 3A.

Fig. 5A/5B are schematic external perspective views of the pressure sensor assembly of fig. 3A.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited by the specific embodiments disclosed below.

In describing the embodiments of the present application in detail, the cross-sectional views illustrating the structure of the device are not enlarged partially in a general scale for convenience of illustration, and the schematic drawings are only examples, which should not limit the scope of the present application. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

As used in this application and the appended claims, the terms "a," "an," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.

For convenience in description, spatial relational terms such as "below," "beneath," "below," "under," "over," "upper," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that these terms of spatial relationship are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary words "below" and "beneath" can encompass both an orientation of up and down. The device may have other orientations (rotated 90 degrees or at other orientations) and the spatial relationship descriptors used herein should be interpreted accordingly. Further, it will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.

In the context of this application, a structure described as having a first feature "on" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed in between the first and second features, such that the first and second features may not be in direct contact.

Fig. 3A is a schematic diagram of an internal structure of a pressure sensor assembly according to an embodiment of the present invention. As shown in fig. 3A, a pressure sensor assembly 300 is used to detect the pressure of a vehicle fuel tank, and the pressure sensor 300 includes a housing 310, a printed circuit board 320, a pressure sensor 330, and a cover 340. The housing 310 of the pressure sensor 300 further includes an air inlet hole 310b, and a waterproof air permeable membrane 360 is attached to a bottom port of the air inlet hole 310b and communicated to the inside of the housing 310. The waterproof vented membrane 360 serves to block the ingress of outside water vapor into the interior of the pressure sensor assembly 300, preventing the effects of water vapor or liquid on the component life and operation of the internal components of the pressure sensor assembly 300. The air inlet hole 310b is used to keep the air inside the pressure sensor and the air outside the pressure sensor flowing. The upper cover 340, the printed circuit board 320, the pressure sensor 330, and the housing 310 are connected in sequence. The pressure sensor 330 is mounted to the printed circuit board 320 by a technique, which may be surface mount technology or other packaging techniques. The housing 310 may include a glue storage slot 311, the upper cover 340 and the glue storage slot 311 of the housing 310 are fixed to each other by gluing through the glue storage slot, and the upper cover 340 and the housing 310 cooperate to fix the assembled printed circuit board 320 and the pressure sensor 330. Upon receiving the pressure signal, the pressure sensor 330 inputs the pressure signal to the ECU through the contact pin 350. The pins 350 and the printed circuit board 320 may be connected by a soldering process.

The utility model discloses compare current pressure sensor subassembly, improved equipment and the sealed mode between shell, pressure sensor and the printed circuit board, reduced technology complexity, improved the detection precision of device.

Fig. 3B is an enlarged schematic view of the internal structure of the pressure sensor assembly in fig. 3A. As shown in fig. 3B, the housing 310 has a seal groove with a seal groove a face and a seal groove B face. In some other embodiments, the housing 310 may have one or more seal grooves symmetrically disposed on the housing 310 along a centerline of the pressure sensor 330, which may be spaced apart by ribs. In this embodiment, the housing 310 has two seal slots 312 and 313 (see FIG. 5B) separated by a rib 315, the rib 315 being below the seal slot A face of the seal slot. In some other embodiments, the sealing

grooves

312 and 313 may be integrally connected sealing grooves (see fig. 5A), and as shown in fig. 5A, the sealing

grooves

312 and 313 may communicate with each other in a ring structure. The pressure sensor 330 is installed between one side 320a of the printed circuit board 320 and the sealing

grooves

312 and 313, and at least a portion of the pressure sensor 330 is bonded to the sealing

grooves

312 and 313 by the sealing grooves, and at least a portion of the pressure sensor 330 is disposed in the sealing

grooves

312 and 313. The pressure sensor 330 and the surface of the sealing groove A are provided with a certain gap 330a, and the gap 330a can prevent the pressure sensor 330 from being pressed during assembly and limiting, so that the stress generated by pressing is reduced, and the measurement accuracy is inaccurate.

Fig. 4A is a schematic structural diagram of the pressure sensor assembly in fig. 3A from another view angle, fig. 4B is a schematic detail diagram of an upper cover protrusion of the pressure sensor assembly in fig. 3A, and fig. 5A/5B are schematic external view views of the pressure sensor assembly in fig. 3A. The combined spacing between the pressure sensor 330, the housing 310, the upper cover 340 and the printed circuit board 320 is described below with respect to fig. 3B, fig. 4A-B and fig. 5A/5B:

in the present embodiment, the housing 310 has two sealing

grooves

312 and 313, and here, the sealing groove 313 on the right side of the pressure sensor 330 in fig. 5B is taken as an example for illustration, and the sealing groove 312 on the other side may have a similar structure. As shown in fig. 3B, the sealing groove 313 of the housing 310 has a sealing groove a surface 313a and a sealing groove B surface 313B. The sealing groove a surface 313a is lower than the bottom surface of the pressure sensor 330, and at least a part of the pressure sensor 330 is disposed in the sealing groove 313 through the sealing groove glue. The sealing groove B surface 312B is higher than the bottom surface of the pressure sensor 330, and this arrangement makes it possible to apply adhesive to at least a part of the bottom surface and the side surface of the pressure sensor 330, thereby increasing the adhesion area between the pressure sensor 330 and the sealing groove of the housing 310 and ensuring the adhesion strength and the sealing effect.

The upper cover 340 includes an upper cover protrusion 341, and the upper cover protrusion 341 abuts against the other side 320b of the printed circuit board 320 to limit the printed circuit board 320. As shown in fig. 4A, the view of fig. 4A is a side view of the pipe of the fuel tank pressure sensor assembly, the housing 310 further includes a supporting step 314, the pressure sensor 330 is limited by the supporting step 314, and the printed circuit board 320 is fixed between the supporting step 314 and the upper cover 340, i.e. the combination of the pressure sensor 330 and the printed circuit board 320 is limited by the supporting step 314 and the upper cover protrusion 341 of the upper cover 340.

In the combined position limitation, fig. 4B is a detailed schematic diagram of the upper cover protrusion of the pressure sensor assembly in fig. 3A, and the shape and structure of the upper cover protrusion 341 of the upper cover 340 can be clearly seen from fig. 4B, the upper cover protrusion 341 is provided on one side of the upper cover 340 and has two convex surfaces 341a and 341B, and in some other embodiments, the upper cover protrusion 341 may also have multiple convex surfaces. Fig. 5A/5B are schematic external perspective views of the pressure sensor assembly of fig. 3A. As shown in fig. 5A/5B, the pressure sensor package 300 is secured to a fuel tank pressure sensor package conduit 30, and an outer sealing ring 370 is provided on the conduit 30, the outer sealing ring 370 being used to effect a sealed connection of the conduit 30 to a fuel tank conduit (not shown in fig. 5A/5B). From this perspective, it can be seen that the supporting steps 314 of the housing 310 are located at both sides of the housing 310 and protrude from the surface of the housing 310, the

housing sealing grooves

312 and 313 are recessed from the surface of the housing 310, and the

housing sealing grooves

312 and 313 may be connected to each other (as shown in fig. 5A) or separated by ribs 315 (as shown in fig. 5B).

The above embodiment of the utility model provides a new pressure sensor subassembly is proposed, it is spacing to have a combination in this subassembly, and the upper cover of upper cover is protruding promptly, printed circuit board, pressure sensor and the combination of the support step of shell are spacing to and pressure sensor passes through the viscose with the seal groove of shell and is connected, has cancelled the equipment of parts such as screw and rectangle sealing washer. The bidirectional limiting of the supporting step and the upper cover protrusion on the printed circuit board can greatly reduce the risk of sealing failure of the product in the processes of falling, mechanical vibration and the like, improve the reliability of the product, reduce the area of the printed circuit board which needs to be reserved for screw holes, reduce the complexity of the process, improve the output precision of the product, and reduce the material cost and the process cost of the product.

The order of processing elements and sequences, the use of alphanumeric characters, or other designations in the present application is not intended to limit the order of the processes and methods in the present application, unless otherwise specified in the claims. While various presently contemplated embodiments have been discussed in the foregoing disclosure by way of example, it should be understood that such detail is solely for that purpose and that the appended claims are not limited to the disclosed embodiments, but, on the contrary, are intended to cover all modifications and equivalent arrangements that are within the spirit and scope of the embodiments herein disclosed.

This application uses specific words to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Similarly, it should be noted that in the preceding description of embodiments of the application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to require more features than are expressly recited in the claims. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.

Although the present invention has been described with reference to the present specific embodiments, it will be understood by those skilled in the art that the above embodiments are merely illustrative of the present invention, and various equivalent changes and substitutions may be made without departing from the spirit of the present invention, and therefore, changes and modifications to the above embodiments within the spirit of the present invention will fall within the scope of the claims of the present application.

Claims

1. A pressure sensor assembly for detecting the pressure of a vehicle fuel tank, said pressure sensor assembly comprising a housing, a printed circuit board, a pressure sensor and an upper cover,

the shell is provided with a sealing groove, the pressure sensor is installed between one side of the printed circuit board and the sealing groove, and at least one part of the pressure sensor is bonded with the sealing groove; the upper cover is abutted against the other side of the printed circuit board.

2. The pressure sensor assembly of claim 1, wherein the housing has one or more seal grooves.

3. The pressure sensor assembly of claim 2, wherein the one or more seal grooves are symmetrically disposed along a centerline of the pressure sensor.

4. The pressure sensor assembly of any of claims 1-3, wherein at least a portion of the pressure sensor is disposed within the seal groove.

5. The pressure sensor assembly of claim 4, wherein the upper cover includes an upper cover projection that abuts the other side of the printed circuit board.

6. The pressure sensor assembly of claim 1, wherein the housing further comprises a support ledge, the printed circuit board being secured between the support ledge and the upper cover.

7. The pressure sensor assembly of claim 1 wherein the housing further comprises an outer seal ring for sealing a junction of the housing and a vehicle fuel tank conduit.

8. The pressure sensor assembly of claim 1, wherein the housing further comprises a glue reservoir, the upper cover being bonded to the glue reservoir.

9. The pressure sensor assembly of claim 1, wherein the housing further comprises an air inlet through hole and a waterproof vent membrane attached to a bottom port of the air inlet through hole and communicating to an interior of the housing.

10. The pressure sensor assembly of claim 1, wherein the pressure sensor is mounted to the printed circuit board by surface mount technology.