CN210953211U - Pressure sensor assembly - Google Patents

Abstract

The utility model provides a pressure sensor assembly, include: the shell comprises a cavity and an opening frame, wherein the opening frame comprises a shell L-shaped groove; the upper cover comprises a double-L-shaped groove and is arranged at the edge of the upper cover; the upper cover and the shell are integrated through the double L-shaped grooves and the shell L-shaped groove cover. The utility model discloses a new seal structure, casing and upper cover combination form similar two L type groove structures, simplify the rubber coating technology simultaneously, can improve the leakproofness between product casing and the upper cover by a wide margin and require and reduce product boundary size to a certain extent, avoid because of the risk that product boundary size brought greatly.

Description

Pressure sensor assembly

Technical Field

The utility model relates to a novel fuel tank pressure sensor, especially a pressure sensor subassembly.

Background

The fuel tank pressure sensor is one of dozens of sensors on an automobile, and is used for detecting fuel evaporation pressure, further judging whether fuel overproof emission risks exist according to the pressure value of fuel tank evaporation, converting the detected pressure value into a corresponding voltage value, and sending a pressure signal to an Electronic Control Unit (ECU) of the automobile.

The structure of the product generally adopted at present is shown in fig. 1 to 4.

The sensor assembly comprises a shell 1, an upper cover 2, a waterproof breathable film 3, a protective cover 4, a contact pin 5, a PCB 6, a pressure chip 7 and a sealing ring 8. The pressure chip 7 is attached to the PCB 6 through an SMT process, and then the pressure chip 7 in the assembled PCB 6 and the shell 1 are bonded and sealed through gluing so as to meet the sealing requirement of the joint of the pressure chip 7 and the shell 1.

Fig. 3 is a schematic structural view of a conventional housing 1.

The inner peripheral edge of the shell 1 is designed by a U-shaped groove 9.

Fig. 4 illustrates the structure of the prior art upper cover 2, and the upper cover 2 is matched with the shell 1, and an upper cover rib position 10 structure with a raised edge is adopted.

During assembly, the PCB 6 and the pressure chip 7 are covered by the upper cover 2, and the rib 10 of the upper cover is adhered by gluing in the U-shaped groove 9 of the shell 1, so that the sealing requirement between the shell 1 and the upper cover 2 is met. An enlarged view of the assembled structure is shown in FIG. 2.

The defects of the structure in practical use include the following aspects:

firstly, the upper cover 2 and the shell 1 are usually glued, bonded and sealed in the shell U-shaped groove 9, in the actual gluing process, due to uneven gluing and the difference of glue flowability, the tightness of the shell 1 and the upper cover 2 is poor, a poor phenomenon can occur in a sealing test, the occurrence rate of the poor phenomenon is relatively high, and the glue distribution in the shell U-shaped groove 9 is analyzed to be uneven, so that the rib position 10 of the upper cover is locally free from obvious glue sticking phenomenon, and the gluing process parameters are difficult to control;

secondly, after the shell U-shaped groove 9 of the shell 1 is coated with glue, the upper cover rib position 10 of the upper cover 2 is arranged in the shell U-shaped groove 9, and the distribution state of the glue cannot be observed after the upper cover is assembled, so that the risk of poor sealing performance between the shell 1 and the upper cover 2 is increased;

thirdly, because casing 1 need design casing U type groove 9, occupation space layout is great, when the product has boundary dimension requirement, and receives the restriction of the inside overall arrangement of product, and the design of casing U type groove 9 to a great extent can make the boundary dimension increase of product, leads to unable satisfying product boundary dimension requirement.

SUMMERY OF THE UTILITY MODEL

For solving rubber coating technological parameter difficult control among the prior art, product casing and upper cover leakproofness do not reach the product boundary size scheduling problem on the large side well, the utility model discloses a new seal structure, casing and upper cover combination form similar two L type groove structures, simplify the rubber coating technology simultaneously, can improve the leakproofness requirement between product casing and the upper cover by a wide margin and reduce product boundary size to a certain extent, avoid because of the risk that product boundary size is brought on the large side.

The to-be-solved technical problem of the utility model is to provide an improved pressure sensor subassembly to realize good leakproofness, and effectively reduced product boundary size.

In order to solve the technical problem, the utility model provides a pressure sensor assembly, a serial communication port, include:

the shell comprises a cavity and an opening frame, wherein the opening frame comprises a shell L-shaped groove;

the upper cover comprises a double-L-shaped groove and is arranged at the edge of the upper cover;

the upper cover and the shell are integrated through the double L-shaped grooves and the shell L-shaped groove cover.

Preferably, the utility model further provides a pressure sensor assembly, which is characterized in that,

the double-L-shaped groove comprises a first step combination and a second step combination, the height of the first step is lower than that of the second step, and the upper area of the first step, the shell and the second step form a glue storage groove together.

Preferably, the utility model further provides a pressure sensor assembly, which is characterized in that,

the shell L-shaped groove comprises an L-shaped step shape with a low inner part and a high outer part on the upper top surface of the shell frame.

Preferably, the utility model further provides a pressure sensor assembly, which is characterized in that,

further included within the cavity is:

the pressure chip is attached to the PCB, and then the assembled pressure chip in the PCB is bonded and sealed with the shell.

Preferably, the utility model further provides a pressure sensor assembly, which is characterized in that,

the pressure sensor assembly further comprises:

and the sealing ring is assembled on the shell and used for realizing the sealing of the joint of the shell and the oil tank.

Preferably, the utility model further provides a pressure sensor assembly, which is characterized in that,

the pressure sensor assembly further comprises:

and the contact pin is connected with the PCB in a welding manner, and the pressure chip is used for sensing a pressure signal and inputting the pressure signal into an automobile ECU system through the contact pin.

Preferably, the utility model further provides a pressure sensor assembly, which is characterized in that,

the pressure sensor assembly further comprises:

the waterproof breathable film is attached to the bulge of the vent hole of the upper cover;

and the protective cover is buckled on the protrusion of the vent hole of the upper cover.

Compared with the prior art, the utility model has the advantages of it is following:

the product boundary size is relatively small, and the requirement on the product boundary size can be better met; the sealing effect of the shell and the upper cover is reliable; the product cost is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the principle of the invention. In the drawings:

FIG. 1 is a cross-sectional block diagram of a prior art pressure sensor assembly;

FIG. 2 is an enlarged partial schematic view of FIG. 1;

fig. 3 is a schematic structural view of the housing 1 in fig. 1;

FIG. 4 is a schematic view of the structure of the upper cover 2 of FIG. 1;

FIG. 5 is a cross-sectional structural view of the pressure sensor assembly of the present invention;

FIG. 6 is an enlarged partial schematic view of FIG. 5;

FIG. 7 is a schematic structural view of the housing of FIG. 5;

fig. 8 is a schematic structural view of the upper cover in fig. 5.

Reference numerals

1-shell

2-upper cover

3-waterproof and breathable film

4-protective cover

5-pin

6-PCB board

7-pressure chip

8-sealing ring

9-shell U-shaped groove

10-upper cover rib position

12-casing

13-upper cover

14-waterproof and breathable film

15-protective cover

16-pin

17-PCB board

18-pressure chip

19-sealing ring

20-L-shaped groove of shell

210-Combined step

211-first step

212-second step

230-glue storage tank

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only examples or embodiments of the application, from which the application can also be applied to other similar scenarios without inventive effort for a person skilled in the art. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.

As used in this application and the appended claims, the terms "a," "an," "the," 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.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited. Further, although the terms used in the present application are selected from publicly known and used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Further, it is required that the present application is understood not only by the actual terms used but also by the meaning of each term lying within.

Example one

The product structure of the existing fuel tank pressure sensor is analyzed, so that the product boundary size is large, and the root cause of poor sealing property between the shell and the upper cover is that the U-shaped groove of the shell occupies a large space and is large in layout, and the distribution state of glue cannot be observed after glue coating and assembling.

The utility model discloses a new shell body seal structure designs into similar two L type groove structures with casing and upper cover combination, and two L type groove occupation space overall arrangement are less relatively to reduced product boundary size, the rubber coating again after casing and the upper cover assembly can observe glue distribution state behind the rubber coating, optimized the rubber coating technology, improved the leakproofness between product casing and the upper cover by a wide margin.

The structure of the pressure sensor module according to the present invention will be described with reference to fig. 5, 6, 7, and 8.

Fig. 5 is a partial cross-sectional structural view of the pressure sensor assembly of the present invention.

As can be understood from the figure, the pressure sensor of the present invention comprises a casing 12, an upper cover 13, a waterproof and breathable film 14, a protective cover 15, a contact pin 16, a PCB 17, a pressure chip 18, and a sealing ring 19.

The pressure chip 18 is attached to the PCB 17 by an SMT process, and then the pressure chip 18 and the housing 12 in the assembled PCB 17 are sealed by gluing and bonding, so as to meet the sealing requirement at the joint of the pressure chip 18 and the housing 12.

A particular improvement of the present invention is embodied in the sealing structure of the housing 12 and the upper cover 13, as shown in fig. 6.

The shell 12 comprises a cavity and an opening frame, and in the design of the opening frame, the traditional U-shaped groove 9 is changed into a shell L-shaped groove 20 structure, and meanwhile, the design of a double L-shaped groove 21 is also adaptively improved for the structure of the upper cover 13. To be described further, the upper top surface of the rim of the housing 12 is formed in an L-shaped step shape with a low inside and a high outside.

The lower frame of the upper cover 13 adopts a double-L-shaped groove 21 structure, please refer to fig. 6 and 8 at the same time.

Specifically, the lower frame of the upper cover 13 forms a double L-shaped groove 21 by using a combined step 210, wherein the height of the first step 211 is lower than that of the second step 212.

The L-shaped groove inner side of the shell and the first step are matched in a clearance fit mode, an interference fit mode and a transition fit mode.

The embodiment shown in the figure is the case that the dimension of the first step 211 of the upper cover in the length and width directions is slightly smaller than that of the housing 12 in the length and width directions, and in addition, the combination can be realized in the interference fit and transition fit.

When the upper cover 13 is closed with the housing 12, the first step 211 is closed on the lower step of the inner side of the housing 12, and the second step 212 is higher than the first step 211, so that the glue storage groove 230 is formed on the first step 211, as shown in fig. 6.

Fig. 6 is a partially enlarged structural view of a double L-shaped groove formed by combining a casing L-shaped groove 20 of the casing 12 and a double L-shaped groove 21 of the upper cover, and it can be seen from the figure that the casing L-shaped groove 20 and the double L-shaped groove 21 of the upper cover form a similar double L-shaped glue storage groove, a gap formed by combining the casing L-shaped groove and the double L-shaped groove 21 is a casing and upper cover combined gap 22, the combined gap is bonded and sealed by gluing, the glue distribution state is easy to observe after gluing, and the space layout occupied by the casing L-shaped groove 20 and the double L-shaped groove 21 of the upper cover.

Fig. 7 is a detailed structural view of the housing L-shaped groove 20, and fig. 8 is a detailed structural view of the upper cover double L-shaped groove 21.

In addition, the sensor assembly further comprises a sealing ring 19, wherein the sealing ring 19 is directly assembled on the shell 12 and used for realizing the sealing requirement of the joint of the shell 12 and the oil tank.

The contact pin 16 is connected with the PCB 17 through welding, and the pressure chip 18 is used for sensing a pressure signal and inputting the pressure signal into an ECU system of the automobile through the contact pin.

The waterproof breathable film 14 is attached to the protrusion of the vent hole of the upper cover 13, and the protective cover 15 is buckled on the protrusion of the vent hole of the upper cover 13, so that the waterproof breathable requirement of the product is met.

Comparing fig. 6 with fig. 2 of the existing pressure sensor assembly, it can be found that the layout of the occupied space of the U-shaped groove 9 of the shell is large, the upper cover 2 is installed after the U-shaped groove 9 of the shell is coated with glue, glue is easily distributed unevenly and cannot be observed, and therefore the phenomenon that the tightness between the shell 1 and the upper cover 2 is poor is caused, and thus the control of the gluing process is more difficult.

The utility model discloses a two L type groove composite seal structure, wherein design casing L type groove 20 on the casing, the characteristic of covering the two L type grooves 21 of design upper cover on is: the shell L-shaped groove 20 and the upper cover double-L-shaped groove 21 are combined to form a similar double-L-shaped glue storage groove, a gap formed by combining the shell L-shaped groove and the upper cover double-L-shaped groove is a shell and upper cover combined gap 22, the combined gap is relatively small, the glue is bonded and sealed through gluing, the glue distribution state is easy to observe after the gluing, and the space layout occupied by the shell L-shaped groove 20 and the upper cover double-L-shaped groove 21 is relatively small, so that the problems that the shell and the upper cover are poor in sealing performance, the boundary size of a product is large and the like.

When using the utility model discloses during the subassembly, assemble the fuel tank pressure sensor product to the oil tank pipeline on, inlet port 23 on the casing links to each other with the oil tank, and at the oil tank during operation, the pressure of 18 perception fuel vaporizations of pressure chip turns into voltage signal after enlargiing to take care of and analog to digital conversion operation with the difference of external atmospheric pressure, and this voltage signal is inputed to ECU through the contact pin, and then as the reference foundation of ECU follow-up action.

To sum up, the utility model discloses fuel tank pressure sensor compares with current product has following apparent advantage:

firstly, the size of the product boundary is relatively small, so that the requirement of the product boundary size can be better met;

the utility model discloses a two L type groove composite seal structure of casing L type groove and upper cover, this two L type groove seal structure occupation space overall arrangement is less relatively, has the requirement at product boundary size, and under the limited condition of product inside overall arrangement, and this two L type structures can satisfy product boundary size requirement better.

Secondly, the sealing effect of the shell and the upper cover is reliable;

in the actual assembling process, after the L-shaped groove of the shell and the double L-shaped grooves of the upper cover are combined, the glue is glued, bonded and sealed, the distribution state of the solidified glue is easy to observe, the bad sealing risk is easy to identify, and the sealing effect is reliable.

Thirdly, the product cost is reduced;

the utility model discloses a two L type groove seal structure, reduced the sealed harmfully of casing with the upper cover, process control is simple effective, has reduced the material cost and the process cost of product by a wide margin.

Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing disclosure is by way of example only, and is not intended to limit the present application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.

Also, this application uses specific language 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 present application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and 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.

Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the use of the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiments. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.

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

Claims (7)

1. A pressure sensor assembly, comprising:

the shell comprises a cavity and an opening frame, wherein the opening frame comprises a shell L-shaped groove;

the upper cover comprises a double-L-shaped groove and is arranged at the edge of the upper cover;

the upper cover and the shell are integrated through the double L-shaped grooves and the shell L-shaped groove cover.

2. The pressure sensor assembly of claim 1,

the double-L-shaped groove comprises a first step combination and a second step combination, the height of the first step is lower than that of the second step, and the upper area of the first step, the shell and the second step form a glue storage groove together.

3. Pressure sensor assembly according to claim 1 or 2,

the shell L-shaped groove comprises an L-shaped step shape with a low inner part and a high outer part on the upper top surface of the shell frame.

4. The pressure sensor assembly of claim 3, further comprising within the cavity:

the pressure chip is attached to the PCB, and then the assembled pressure chip in the PCB is bonded and sealed with the shell.

5. The pressure sensor assembly of claim 4, further comprising:

and the sealing ring is assembled on the shell and used for realizing the sealing of the joint of the shell and the oil tank.

6. The pressure sensor assembly of claim 5, further comprising:

and the contact pin is connected with the PCB in a welding manner, and the pressure chip is used for sensing a pressure signal and inputting the pressure signal into an automobile ECU system through the contact pin.

7. The pressure sensor assembly of claim 6, further comprising:

the waterproof breathable film is attached to the bulge of the vent hole of the upper cover;

and the protective cover is buckled on the protrusion of the vent hole of the upper cover.

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