Protective shell for double-pressure sensor and double-pressure sensor

Abstract

The utility model relates to the technical field of pressure sensors, in particular to a protective shell for a double-pressure sensor and the double-pressure sensor, which comprises a sealing cover and a base, a first sealing groove is arranged on a first limiting part of the sealing cover, a first sealing bulge is arranged on a first upper surface of the base, and the first sealing bulge extends into the first sealing groove. The first sealing protrusion and the first sealing groove are fused and fixed into a whole through ultrasonic welding to achieve sealing of the base and the sealing cover, due to the fact that the first sealing protrusion is fused into the first sealing groove through ultrasonic waves, the sealing cover and the base are made of the same material, and the first sealing protrusion and the first sealing groove are seamlessly connected and fused into a whole. And water cannot enter, so that a long-term sealing effect and a long-term IP protection capability are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure sensors, in particular to a protective shell for dual pressure sensors and a dual pressure sensor. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] The protective shell currently used in the dual pressure sensor includes a sealing cover and a base. The existing sealing cover and the base are encapsulated with epoxy resin glue. The resin encapsulation is easily exposed to harsh environments such as long-term humidity or high temperature, and is prone to absorbing moisture and decomposing, expanding or aging, which makes it impossible to seal the sealing cover and the base, and ultimately leads to the failure of IP protection. Secondly, the existing technology uses a method of fixing the base to the inspected pipe or other components, and using epoxy resin to encapsulate the base and the sealing cover. The short-term pull-out force test meets the requirements, but long-term vibration and high-temperature and extreme cold environments can easily cause the epoxy resin to age, resulting in the separation of the sealing cover and the base, which in turn causes abnormal noise or affects the accuracy of the dual pressure sensor test. Utility Model Content

[0004] In order to solve the problem that an epoxy resin glue packaging process is adopted between the sealing cover and the base, the resin packaging is easily susceptible to moisture absorption and decomposition, expansion or aging in harsh environments such as long-term humidity or high temperature, thereby causing the sealing cover and the base to be unable to achieve sealing, and ultimately leading to failure of IP protection, the utility model provides a protective shell for a dual pressure sensor, by providing a first sealing groove on the first limiting portion of the sealing cover, and providing a first sealing protrusion on the first upper surface of the base, the first sealing protrusion extends into the first sealing groove, and the first sealing protrusion and the first sealing groove are fused and fixed into one by ultrasonic welding to achieve sealing between the base and the sealing cover. Since the first sealing protrusion is melted into the first sealing groove by ultrasonic wave, the sealing cover and the base are made of the same material, that is, the first sealing protrusion and the first sealing groove are seamlessly connected and fused into one, and moisture cannot enter, thereby achieving a long-term sealing effect and lasting IP protection capability.

[0005] To achieve the above purpose, the utility model provides the following technical solutions: a protective shell for a dual pressure sensor, comprising

[0006] A sealing cover having an outwardly protruding plug hole integrally formed on its upper portion, a reference cavity disposed therein, a connecting cavity disposed outside the reference cavity, the connecting cavity being in communication with the reference cavity, a first limiting portion being circumferentially disposed at the connection point, and a first sealing groove being circumferentially disposed along the first limiting portion;

[0007] A base, the base comprising a first upper surface, and a first sealing protrusion integrally injection-molded along a circumferential direction on the first upper surface;

[0008] The base is embedded in the connecting cavity along the connecting cavity, so that the first upper surface is in contact with the first limiting portion and limits the base, and the first sealing protrusion extends into the first sealing groove, and the first sealing protrusion and the first sealing groove are fused and fixed into one by ultrasonic welding to achieve sealing between the base and the sealing cover.

[0009] The utility model provides a protective shell for a dual pressure sensor, wherein the surface of the first limiting portion is perpendicular to the inner wall of the connecting cavity, that is, a plane, and the surfaces around the first upper surface that contact the first limiting portion are also planes.

[0010] The utility model provides a protective shell for a dual pressure sensor, wherein the surface of the first limiting portion is an inclined surface, and the inclined surface extends from the connecting cavity to the reference cavity, and the distance from the inclined surface to the axis of the plug hole gradually decreases.

[0011] The utility model provides a protective shell for a dual pressure sensor, wherein the first sealing protrusion includes a first side surface and a second side surface, and the distance between the first side surface and the second side surface gradually decreases from bottom to top of the first sealing protrusion, and the first sealing protrusion and the first sealing groove are fused into one by ultrasonic waves, so that the first sealing protrusion can be better melted during ultrasonic vibration friction.

[0012] The utility model provides a protective shell for dual pressure sensors, wherein two fixing areas for fixing and sealing the pressure sensors are provided on the first upper surface, and pressure introduction holes for taking pressure from the pressure sensors are provided on the fixing areas, which facilitates the installation and measurement of the pressure sensors.

[0013] The utility model provides a protective shell for a dual pressure sensor, wherein the base further comprises a first lower surface, and two pressure-taking tubes for taking pressure are integrally formed on the first lower surface and extend away from the first upper surface. The pressure-taking tubes are connected to the pressure introduction hole to facilitate obtaining the medium of the liquid or gas pipeline.

[0014] The utility model provides a protective shell for a dual pressure sensor, wherein a second sealing groove is arranged on the fixing area along the circumference of the pressure introduction hole, and a sealing ring is arranged in the second sealing groove to achieve sealing between the pressure-sensitive capacitor and the base, thereby ensuring measurement accuracy.

[0015] The utility model provides a protective shell for a dual pressure sensor, wherein the air outlet of the pressure introduction hole is a tapered port.

[0016] The utility model provides a protective shell for a dual pressure sensor, wherein first connecting protrusions are symmetrically extended from both sides of the sealing cover in a direction away from the plug-in hole, and fixing holes are provided on the first connecting protrusions to facilitate fixing the sealing cover to the measured pipe or component.

[0017] The utility model provides a protective shell for a dual pressure sensor, wherein isolation protrusions are evenly arranged on the sides of the base for easy removal from the sealing cover, and the base is in contact with and connected to the side wall of the connecting cavity of the sealing cover via the isolation protrusions.

[0018] The utility model provides a protective shell for a dual pressure sensor, which also includes a PIN needle for transmitting signals. The PIN needle penetrates the sealing cover and enters the plug-in hole, and the PIN needle is sealed and connected to the sealing cover.

[0019] The utility model provides a protective shell for a dual pressure sensor, wherein the inner wall of the sealing cover extends a protrusion along the axial direction of the plug-in hole in a direction away from the plug-in hole, and a plurality of third sealing grooves are provided on the protrusion. The PIN needle passes through the sealing cover from the third sealing groove and enters the plug-in hole, and a sealant is provided in the third sealing groove for sealing.

[0020] A dual pressure sensor comprises a protective shell and a pressure sensor housing, wherein the pressure sensor housing is injection-molded on a base.

[0021] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model provides a protective shell for a dual pressure sensor. The ultrasonic welding process is adopted between the sealing cover and the base of this design, so that the sealing cover and the base, which are made of the same material, are perfectly fused together, thereby improving the IP protection level and significantly improving the pulling force between the sealing cover and the base, thereby avoiding the risk of the sealing cover falling off the base; secondly, the embedded installation method between the base and the sealing cover provides double protection against the sealing cover and the base falling off in actual applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the connection between a protective shell and a PIN needle for a dual pressure sensor of the utility model;

[0023] Figure 2 A schematic diagram of a first structure of the connection between the sealing cover and the PIN needle;

[0024] Figure 3 is a first structural schematic diagram of the base;

[0025] Figure 4 for Figure 3 A magnified view of middle A;

[0026] Figure 5 A second structural diagram showing the connection between the sealing cover and the PIN needle;

[0027] Figure 6 is a second structural schematic diagram of the seat;

[0028] Figure 7 This is an injection molding diagram of a protective shell for a dual pressure sensor and a pressure sensor housing of the utility model;

[0029] Figure 8 It is a structural diagram of the base embedded in the sealing cover. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the utility model embodiments in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the utility model embodiments, not all of the embodiments. Based on the utility model embodiments, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of utility model protection.

[0031] In the description of the utility model, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limitations on the utility model.

[0032] In the description of the utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "disposed" should be understood broadly. For example, they may refer to fixed connection or disposition, detachable connection or disposition, or integral connection or disposition. Those skilled in the art will understand the specific meanings of the above terms in the utility model based on the specific circumstances.

[0033] Currently, epoxy resin encapsulation is used between the sealing cover and the base. The resin encapsulation is prone to absorb moisture and decompose, expand or age in harsh environments such as long-term humidity or high temperature, which can cause the sealing cover and the base to fail to seal, ultimately leading to IP protection failure. Figure 1 As shown, the present design provides a first sealing groove 14 on the first limiting portion 13 of the sealing cover 10, and provides a first sealing protrusion 23 on the first upper surface 24 of the base 20. The first sealing protrusion 23 extends into the first sealing groove 14, and the first sealing protrusion 23 and the first sealing groove 14 are fused and fixed into one by ultrasonic welding to achieve sealing between the base 20 and the sealing cover 10. Since the first sealing protrusion 23 is melted into the first sealing groove 14 by ultrasonic wave, the material of the sealing cover and the base is the same, that is, the first sealing protrusion 23 and the first sealing groove 14 are seamlessly connected and fused into one, and moisture cannot enter, thereby achieving a long-term sealing effect and lasting IP protection capability.

[0034] This design can be used in other sealing detection equipment and sealing equipment.

[0035] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0036] like Figure 1-3 As shown, a protective case for a dual pressure sensor includes a sealing cover 10 and a base 20. The sealing cover 10 and the base 20 are respectively integrally injection-molded structures. The sealing cover 10 and the base 20 are made of the same material. The base 20 is embedded in the sealing cover 10, and the first sealing protrusion 23 of the base 20 is completely fused with the first sealing groove 14 of the sealing cover 10 through an ultrasonic welding process to achieve a perfect seal, thereby greatly improving the IP protection level while avoiding the risk of the sealing cover 10 falling off the base 20.

[0037] A protective shell for a dual pressure sensor, such as Figure 2 and 5 As shown, the sealing cover 10 has an integrally formed upper portion with an outwardly protruding insertion hole 15, a reference cavity 11 is provided inside the sealing cover 10, a connecting cavity 12 is provided outside the reference cavity 11, the connecting cavity 12 is connected to the reference cavity 11, and a first limiting portion 13 is provided circumferentially at the connection point, and a first sealing groove 14 is provided circumferentially along the first limiting portion 13; Figure 3 and 6 As shown, the base 20 includes a first upper portion 24 and a first sealing protrusion 23 integrally injection-molded along the circumferential direction on the first upper portion 24; the base 20 is embedded in the connecting cavity 12 along the connecting cavity 12, so that the first upper portion 24 is in contact and connected with the first limiting portion 13 and limits the base 20, and the first sealing protrusion 23 extends into the first sealing groove 14, and the first sealing protrusion 23 and the first sealing groove 14 are fused and fixed into one by ultrasonic welding to achieve sealing between the base 20 and the sealing cover 10.

[0038] like Figure 1 As shown, a protective case for a dual pressure sensor also includes a PIN needle 30 for transmitting signals to output the internal pressure signal. The PIN needle 30 is sealed with the sealing cover 10. The inner wall of the sealing cover 10 extends a protrusion 18 axially inward along the plug hole 15. A plurality of third sealing grooves 19 are provided on the protrusion 18. The PIN needle 30 passes through the sealing cover 10 from the third sealing groove 19 and enters the plug hole 15. Sealant is provided in the third sealing groove 19 to perform a second seal on the connection between the PIN needle 30 and the sealing cover 10.

[0039] In a specific embodiment, Figure 2 As shown, the surface of the first limiting portion 13 is perpendicular to the inner wall of the connecting cavity 12 .

[0040] In another specific embodiment, the surface of the first limiting portion 13 is an inclined surface, which extends from the connecting cavity 12 to the reference cavity 11, and its distance from the axis of the plug-in hole 15 gradually decreases, wherein the cross-section of the first limiting portion 13 is a conical structure, that is, the straight-line distance from the axis of the plug-in hole 15 gradually decreases from bottom to top, wherein the part of the first upper surface 24 that contacts the first limiting portion 13 matches the structure of the first limiting portion 13, and is also an inclined surface, thereby achieving the tightness of ultrasonic welding.

[0041] As a preference, Figure 3 、 4 As shown in Figure 6, the first sealing protrusion 23 includes a first side surface 231 and a second side surface 232. The distance between the first side surface 231 and the second side surface 232 gradually decreases from bottom to top of the first sealing protrusion 23, and the first sealing protrusion 23 and the first sealing groove 14 are fused into one by ultrasonic waves. The cross-section of the first sealing protrusion 23 can be a triangle, and the first sealing protrusion 23 is melted from top to bottom by ultrasonic waves, thereby melting the first sealing protrusion 23 into the first sealing groove 14 to achieve one-piece sealing molding.

[0042] like Figure 3 and 6 As shown, two fixing areas 21a, 21b for fixing and sealing the pressure sensor are provided on the first upper surface 24, and pressure introduction holes 22a, 22b for taking pressure from the pressure sensor are provided on the fixing areas 21a, 21b, wherein second sealing grooves 27a, 27b are provided circumferentially along the pressure introduction holes 22a, 22b on the fixing areas 21a, 21b, and sealing of the pressure-sensitive capacitor and the base 20 is achieved by providing sealing rings in the second sealing grooves 27a, 27b.

[0043] As a preference, Figure 3 and 6 As shown, the base 20 further includes a first lower surface 25 , on which are integrally formed two pressure-taking tubes 26 a and 26 b extending away from the first upper surface 24 . The pressure-taking tubes 26 a and 26 b are connected to the pressure introduction holes 22 a and 22 b .

[0044] like Figure 3 and 6 As shown, the air outlets of the pressure introduction holes 22a and 22b are tapered openings to reduce the direct impact of pressure on the pressure-sensitive capacitor.

[0045] like Figure 5 and 8 As shown, a protective shell for a dual pressure sensor is provided, wherein first connecting protrusions 16 are symmetrically extended outward on both sides of the sealing cover 10, a fixing hole 17 is provided on the first connecting protrusion 16, a steel sleeve 40 is provided in the fixing hole 17, and the base 20 is embedded in the sealing cover 10 to fix the sealing cover 10 on the pipeline or component to be detected through the fixing hole 17.

[0046] As a preference, Figure 3 and 6 As shown, isolation protrusions 28 are evenly arranged on the side of the base 20. The base 20 is in contact with and connected to the side wall of the connecting cavity 12 of the sealing cover 10 through the isolation protrusions 28, which makes it easy to remove the base 20 from the sealing cover 10. Secondly, the isolation protrusions 28 are connected to the side wall of the connecting cavity 12 of the sealing cover 10, which reduces the contact area, that is, reduces the friction, and facilitates melting the first sealing protrusion 23 of the base 20 into the first sealing groove 14 of the sealing cover 10 by ultrasonic welding, thereby achieving perfect sealing.

[0047] like Figure 7 As shown, a dual pressure sensor includes a protective shell and pressure sensor housings 50 a and 50 b , wherein the pressure sensor housings 50 a and 50 b are made of metal and are injection-molded on the base 20 .

[0048] like Figure 8 As shown, during installation, the pressure sensor is fixed and sealed in the fixing areas 21a and 21b, and then the base 20 is embedded in the sealing cover 10. The first sealing protrusion 23 of the base 20 is melted into the first sealing groove 14 of the sealing cover 10 by ultrasonic welding to achieve sealing between the base 20 and the sealing cover 10. Then, the sealing cover 10 is fixed to the pipeline or component to be tested through the fixing hole 17.

[0049] The same components and parts are denoted by replacing the suffix "a" with "b" and their description is omitted.

[0050] The above are only specific implementation methods of the utility model, but the scope of protection of the utility model is not limited to them. Any changes or substitutions that do not require creative effort should be covered by the scope of protection of the utility model. Therefore, the scope of protection of the utility model should be based on the scope of protection defined in the claims.

Claims

1. A protective case for a dual pressure sensor, characterized in that: include A sealing cover (10) has an outwardly protruding plug hole (15) integrally formed on its upper portion, a reference cavity (11) disposed therein, a connecting cavity (12) disposed outside the reference cavity (11), the connecting cavity (12) being in communication with the reference cavity (11), a first limiting portion (13) being circumferentially disposed at the connection point, and a first sealing groove (14) being circumferentially disposed along the first limiting portion (13); A base (20), the base (20) comprising a first upper surface (24), a first sealing protrusion (23) integrally injection-molded along a circumferential direction on the first upper surface (24); The base (20) is embedded in the connecting cavity (12) along the connecting cavity (12), so that the first upper surface (24) is in contact with the first limiting portion (13) and limits the base (20), and the first sealing protrusion (23) extends into the first sealing groove (14), and the first sealing protrusion (23) and the first sealing groove (14) are fused and fixed into one by ultrasonic welding to achieve sealing between the base (20) and the sealing cover (10).

2. A protective case for a dual pressure sensor according to claim 1, characterized in that: The surface of the first limiting portion (13) is perpendicular to the inner wall of the connecting cavity (12).

3. The protective case for a dual pressure sensor according to claim 1, wherein: The surface of the first limiting portion (13) is an inclined surface, and the inclined surface extends from the connecting cavity (12) to the reference cavity (11), and its distance from the axis of the plug hole (15) gradually decreases.

4. The protective case for a dual pressure sensor according to claim 1, wherein: The first sealing protrusion (23) comprises a first side surface (231) and a second side surface (232), and the distance between the first side surface (231) and the second side surface (232) gradually decreases from bottom to top of the first sealing protrusion (23).

5. The protective case for a dual pressure sensor according to claim 4, wherein: Two fixing areas (21a, 21b) for fixing and sealing a pressure sensor are provided on the first upper surface (24), and pressure introduction holes (22a, 22b) for taking pressure from the pressure sensor are provided on the fixing areas (21a, 21b).

6. The protective case for a dual pressure sensor according to claim 5, characterized in that: The base (20) further includes a first lower surface (25), on which two pressure-taking tubes (26a, 26b) for taking pressure are integrally formed and extend away from the first upper surface (24). The pressure-taking tubes (26a, 26b) are connected to the pressure introduction holes (22a, 22b).

7. The protective case for a dual pressure sensor according to claim 5, wherein: Second sealing grooves (27a, 27b) are provided on the fixing areas (21a, 21b) along the circumference of the pressure introduction holes (22a, 22b).

8. The protective case for a dual pressure sensor according to claim 5, wherein: The air outlet of the pressure introduction hole (22a, 22b) is a tapered opening.

9. The protective case for a dual pressure sensor according to claim 1, wherein: First connecting protrusions (16) are symmetrically extended from both sides of the sealing cover (10) in a direction away from the plug-in hole (15), and fixing holes (17) are provided on the first connecting protrusions (16).

10. The protective case for a dual pressure sensor according to claim 1, wherein: Isolation protrusions (28) are evenly arranged on the side of the base (20) for facilitating removal from the sealing cover (10), and the base (20) is in contact with and connected to the side wall of the connecting cavity (12) of the sealing cover (10) via the isolation protrusions (28).

11. The protective case for a dual pressure sensor according to claim 1, wherein: It also includes a PIN needle (30) for transmitting signals, wherein the PIN needle (30) penetrates the sealing cover (10) and enters the plug hole (15), and the PIN needle (30) is sealed and connected to the sealing cover (10).

12. The protective case for a dual pressure sensor according to claim 11, wherein: The inner wall of the sealing cover (10) extends a protrusion (18) along the axial direction of the plug hole (15) in a direction away from the plug hole (15), and a plurality of third sealing grooves (19) are provided on the protrusion (18). The PIN needle (30) passes through the sealing cover (10) from the third sealing groove (19) and enters the plug hole (15), and a sealant is provided in the third sealing groove (19).

13. A dual pressure sensor, characterized in that: The invention comprises the protective shell according to any one of claims 1 to 12 and a pressure sensor housing (50), wherein the pressure sensor housing is injection-molded on a base (20).

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