Frame assembly and pressure measuring assembly

Abstract

A frame body assembly for a pressure sensor is used for accommodating protective gel and is easy to exhaust smoothly, and comprises a first frame body with an opening at the upper end and filled with the protective gel, and a second frame body with an opening at the lower end and filled with the protective gel; the second frame body is combined and fixed to the first frame body and is provided with a cover part covering the opening, and the cover part is provided with a vent hole used for penetrating through the upper side and the lower side of the cover part; and the waterproof breathable film is adhered to an approximately flat mounting surface arranged on one side of the inner side and the outer side of the cover part so as to seal and cover the corresponding end of the vent hole. The utility model also discloses a pressure measurement assembly comprising a substrate and the frame assembly, and a manufacturing method of the pressure measurement assembly.

Description

Technical Field

[0001] This application relates to the field of sensor technology, specifically to a frame assembly and a pressure measurement assembly. Background Technology

[0002] Pressure sensors are used to measure the pressure of a medium. They can be categorized into three types based on the measured pressure: absolute pressure, differential pressure, and gauge pressure. When measuring gauge pressure, an ambient reference pressure is required through a vent. Existing gauge pressure sensors typically have a sealed housing to protect the pressure measurement components (especially the pressure chip) within their cavity from environmental moisture. They obtain the reference pressure through a vent covered by a waterproof and breathable membrane, while simultaneously isolating external moisture. Due to the need for a sealed housing, these pressure sensors typically consist of a main housing and at least one cap combined together for manufacturability. Electrical connection terminals located on the main housing or cap (in this case, the cap can also be called an end cap) are electrically connected to the pressure measurement components. However, in some application environments (such as drier environments or environments with an external protective shell), a cap may not be necessary. This allows for structural simplification and size optimization of such pressure sensors.

[0003] On the other hand, to protect the relatively fragile pressure chip and the leads used to connect to the measurement circuit, a frame is typically used to surround the pressure chip and leads, and the frame is filled with protective gel to protect them from mechanical and chemical adverse effects. When considering omitting the cover to simplify the structure of the pressure sensor, the challenge arises in simultaneously protecting the pressure chip and leads with the protective gel: the pressure chip and leads still need to be isolated from external moisture. If they are isolated from the external environment through a frame with vents, a waterproof and breathable membrane needs to be covered over the vents. The protective gel requires a vacuum venting process to remove air bubbles, which is difficult due to the typically high viscosity of the gel. When using such a frame, we found that the available size of the vents is insufficient to guarantee smooth venting due to limitations imposed by the sensor's permissible size, circuit board area, and the edge bonding width of the waterproof and breathable membrane. This results in sensor measurement errors or requires several times the time to achieve complete venting. Utility Model Content

[0004] In view of the shortcomings of the prior art, this application provides a pressure sensor to solve at least one of the above-mentioned technical defects.

[0005] To achieve the above objectives, this application provides the following technical solution: a frame assembly, comprising:

[0006] A first frame having an opening at its upper end, the interior of which is filled with protective gel;

[0007] A second frame is assembled and fixed to the first frame, having a cover portion that seals the opening, and the cover portion having a vent hole for passing through the upper and lower sides of the cover portion.

[0008] A waterproof and breathable membrane is adhered to a flat mounting surface on one side of the inner and outer sides of the cover to seal the corresponding end of the vent hole.

[0009] Preferably, the lower end of the first frame extends outward along a plane to form a first extension for sealingly bonding to an external component with a first adhesive.

[0010] Preferably, the lower end of the second frame extends outward along the plane to form a second extension for sealingly bonding to the first extension with a second adhesive.

[0011] Preferably, the upper end of the first frame forms a third extension that extends vertically, the third extension being integrally connected to the body of the first frame via a ring of support, and the lower end of the first frame abutting against the support; the first frame is sealed to the third extension by a third adhesive.

[0012] Preferably, the support portion is recessed downwards to form a groove, and at least a portion of the third adhesive is contained in the groove.

[0013] Preferably, the second frame further includes a ring body integrally connected to the outer edge of the cover, and the lower part of the body of the second frame forms a tight fit or a threaded fit with the third extension.

[0014] Preferably, the first adhesive and / or the second adhesive are conductive adhesives.

[0015] Preferably, the first frame and / or the second frame are metal parts.

[0016] Preferably, the first frame and / or the second frame are thin-shell metal parts formed by stamping.

[0017] This application also claims a pressure measuring assembly comprising:

[0018] A substrate has at least one pressure-sensitive element and a measuring circuit electrically connected to the pressure-sensitive element via leads on one side, and at least one pressure via penetrating both sides of the substrate is provided thereon, with the pressure-sensitive element correspondingly sealed on one side of the pressure via.

[0019] and at least one frame assembly, which is fixed to the side of the substrate on which the pressure-sensitive element is disposed and surrounds the pressure-sensitive element and the lead wire inside therein, the protective gel covering the pressure-sensitive element and the lead wire.

[0020] This application also provides a method for manufacturing a pressure measuring component, which includes:

[0021] A substrate is provided, on which at least one pressure-sensitive element and a measuring circuit electrically connected to the pressure-sensitive element via leads are disposed on the upper side, and at least one pressure via penetrating both sides of the substrate is disposed on the substrate, and the pressure-sensitive element is correspondingly sealed on the upper side of the pressure via.

[0022] At least one first frame having an opening at the top is provided, the lower end of the first frame is sealed to the upper side of the substrate by a first adhesive, and the pressure-sensitive element is surrounded inside the first frame.

[0023] The interior of the first frame is filled with protective gel so that the protective gel at least covers the corresponding pressure-sensitive element and lead wire;

[0024] The protective gel is degassed under negative pressure.

[0025] Provide at least one second frame having a cover portion, wherein the cover portion is provided with a vent hole for passing through the upper and lower sides of the cover portion;

[0026] The lower end of the second frame is sealed to the first frame by a second adhesive.

[0027] At least one waterproof and breathable membrane is provided and is correspondingly bonded to the outer surface of the cover. Attached Figure Description

[0028] Figure 1 This is a perspective view of the pressure sensor according to the first embodiment;

[0029] Figure 2 This is a top view of the pressure sensor according to the first embodiment;

[0030] Figure 3 The pressure sensor of the first embodiment along Figure 2 The cross-sectional view of AA shown in the figure;

[0031] Figure 4 for Figure 3 An enlarged view of part B shown in the diagram;

[0032] Figure 5 This is a schematic diagram of the pressure measurement assembly in the second embodiment;

[0033] Figure 6 This is a schematic diagram of the pressure measurement component in the third embodiment.

[0034] Explanation of reference numerals in the attached drawings: 11a, First part; 11b, Second part; 11, Pressure introduction channel; 12, Interface tube; 13, Positioning structure; 14, Mounting plane; 15, Recess; 1, Main housing; 20, Pressure sensitive element; 21a, Pressure through hole; 21b, Conductive hole; 21, Substrate; 23, Electronic component; 24, Lead wire; 2, Pressure measuring assembly; 31a, Cantilever; 31b, Connecting part; 31c, Snap-fit ​​part; 31, First snap-fit; 32, Second snap-fit; 3, Connecting structure; 4, Waterproof and breathable 5. Air film; 61. Protective gel; 62. Lateral portion; 63. Longitudinal portion; 64. Elastic portion; 65. Electrical connection terminal; 250. Third adhesive; 251a. Body; 251b. Second extension; 251c. Cover; 251d. Vent hole; 251. Second frame; 252a. Body; 252b. First extension; 252c. Support; 252d. Groove; 252e. Groove inner wall; 252f. Opening; 252g. Third extension; 252. First frame; 25. Frame assembly; Detailed Implementation

[0035] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings. The following embodiments are exemplary and are only used to explain this application, and should not be construed as limiting this application. In the following description, the same reference numerals are used to denote the same or equivalent elements, and repeated descriptions are omitted.

[0036] In the description of this application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this application and to simplify the description, and are not intended to indicate or imply that the equipment or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Furthermore, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] It should also be further understood that the term "and / or" as used in this application specification and the corresponding claims refers to any combination of one or more of the listed items and all possible combinations.

[0039] Please refer to the following: Figures 1-3 In the first embodiment, the pressure sensor includes a generally longitudinally extending main housing 1, the main housing 1 having a generally longitudinal ( Figure 3 The pressure introduction channel 11 extends in the left-right direction. One longitudinal end of the pressure introduction channel 11 is used to introduce the pressure medium to be measured, and its second longitudinal end extends to one side of the main housing 1. Figure 3 The pressure sensor also includes a mounting plane 14 on the upper side of the surface. The pressure sensor further includes a pressure measuring assembly 2 mounted on the mounting plane 14, the pressure measuring assembly 2 having a pressure-sensitive element 20 correspondingly sealed and coupled to the other end of the pressure inlet channel 11. The main housing 1 may be made of resin material, on which a plurality of electrical connection terminals 6 are moldably fixed, these electrical connection terminals 6 preferably along... Figure 3 The front-to-back direction (perpendicular to the plane of the paper) shown is arranged side by side. One end of the electrical connection terminal 6 is electrically connected to the pressure measuring component 2, and the other end can extend generally longitudinally toward the side away from the pressure measuring component 2 to the outside of the main housing 1 for electrical connection with external devices.

[0040] A connecting structure 3 extends outward from the mounting plane 14 of the main housing 1 to form a connection for mechanical connection with external equipment. For example, the connecting structure may include a first latch 31 and a second latch 32 extending outward from the side of the main housing 1 where the pressure measuring component 2 is located. These latches can be connected to plate-shaped or other shaped external equipment. Please refer to the following for details. Figure 1 To give the latch 31 a certain degree of elasticity in the lateral direction, the first latch 31 can include a latching portion 31c, the lower end of which extends longitudinally to form a cantilever portion 31a. The end of the cantilever portion 31a away from the latching portion 31c is connected to the corresponding front and rear sides of the main housing 1 via a connecting portion 31b. Thus, Figure 1 The "U"-shaped structure shown, consisting of the connecting part 31b, the cantilever part 31a, and the latching part 31c, allows the first latch 31 to have a certain degree of elasticity in the vertical direction, which facilitates the mechanical connection between the first latch 31 and external equipment. Similarly, the second latch 32 can also adopt a similar structure to the first latch 31.

[0041] The pressure measuring assembly 2 can also be arranged generally longitudinally. The lower part of the main housing 1 can extend longitudinally outwards towards the end furthest from the electrical connection terminal 6 to form an interface tube 12, the first portion 11a of which can be defined by the inner cavity of the interface tube 12. A stepped positioning structure 13 can be provided at one outer end of the interface tube 12 to facilitate positioning when connected to a fluid interface of a container or pipe containing the pressure medium to be measured.

[0042] The pressure sensor in this embodiment omits the cover typically found in pressure sensors of the prior art, thus simplifying its structure; and it is... Figure 3 The sensors shown have relatively small dimensions in the front-to-back direction; that is, the main body (excluding the clips) is roughly flat and extends longitudinally. These pressure sensors are particularly suitable for use in protected enclosed or semi-enclosed spaces such as automobiles, or other less harsh environments.

[0043] In other schemes, there can be more than one pressure inlet channel 11 and corresponding pressure sensing element 20. For example, there can be two pressure sensing elements 20 and two pressure inlet channels 11, or more.

[0044] Specifically, the pressure introduction channel 11 may include a longitudinally extending first portion 11a and a laterally extending second portion 11b, the second portion 11b being formed by extending laterally from one inner end of the first portion 11a, and the end of the second portion 11b away from the first portion 11a (i.e., the end of the second portion 11b away from the first portion 11a) Figure 3 The upper end of the pressure sensor extends upward to the mounting plane 14. Preferably, to further reduce the vertical dimension of the pressure sensor, the mounting plane 14 may be located at the bottom of a recess 15 formed by the inward recess of the upper surface of the main housing 1.

[0045] Specifically, the pressure measuring assembly 2 may include a substrate 21 fixed to the mounting plane 14, at least one pressure-sensitive element 20 disposed on the upper side of the substrate 21, and a measuring circuit electrically connected to the pressure-sensitive element 20 via a lead 24. The substrate 21 has at least one pressure through-hole 21a extending through both sides of the substrate 21. The pressure-sensitive element 20 is correspondingly blocked on one side of the pressure through-hole 21a. The side of the substrate 21 furthest from the mounting plane 14 (i.e., the side away from the pressure through-hole 21a) Figure 3 The upper side of the substrate 21 is provided with a processing circuit (not labeled) including multiple electronic components 23. The processing circuit is electrically connected to one end of the electrical connection terminal 6 near the pressure measuring component 2. For example, the corresponding end of the electrical connection terminal 6 may extend upward to form a lateral portion 61 perpendicular to the substrate 21. A conductive hole 21b may be provided on the substrate 21, and the lateral portion 61 may be soldered to the conductive hole 21b. The conductive hole 21b is electrically connected to the processing circuit on the upper side of the substrate 21. The pressure-sensitive element 20 is fixed to the side of the substrate 21 away from the mounting plane 14 (i.e., Figure 3 (on the upper side) and electrically connected to the processing circuit via lead 24.

[0046] Preferably, in order to fix the pressure sensor to an external device while also allowing the electrical connection terminal 6 to be easily plugged in, the electrical connection terminal 6 may include the aforementioned transverse portion 61 and a longitudinal portion 62 integrally connected. The middle portion of the longitudinal portion 62 forms an elastic portion 63 that is elastic in the longitudinal direction. For example, the elastic portion 63 may be U-shaped. The two ends of the elastic portion 63 are integrally and vertically connected to the adjacent ends of other portions of the electrical connection terminal 6. The elastic portion 63 may be formed by arching laterally through the longitudinal portion 62.

[0047] Preferably, the pressure measuring assembly 2 may further include at least one frame assembly 25 corresponding to the pressure-sensitive element 20. A protective gel 5, covering at least the pressure-sensitive element 20 and the lead wire 24, is fixedly disposed on the side of the substrate 21 away from the mounting plane 14. The protective gel 5 may be contained within a corresponding frame assembly 25 fixed to the corresponding side of the substrate 21.

[0048] The frame assembly 25 may include at least one first frame 252 corresponding to the pressure-sensitive element 20, which has an opening 252f at its upper end and is filled with protective gel 5.

[0049] Preferably, the frame assembly 25 may further include at least one second frame 251 and at least one waterproof and breathable membrane 4. The second frame 251 is assembled and fixed to the corresponding first frame 252. The second frame 251 has a cover portion 251c that covers the opening 252f. The cover portion 251c is provided with a vent hole 251d for penetrating the upper and lower sides of the cover portion 251c. The waterproof and breathable membrane 4 is adhered to a generally flat mounting surface provided on the inner side of the cover portion 251c, thereby covering the upper end of the vent hole 251d; in other embodiments, the waterproof and breathable membrane 4 may also be disposed on the lower surface of the cover portion 251c in other ways, thereby covering the lower end of the vent hole 251d.

[0050] Please refer to the following: Figure 4 Preferably, the lower end of the first frame 252 extends outward along a plane to form a first extension 252b, which can be more firmly and sealingly bonded to the upper surface of the substrate 21 by a first adhesive (not shown). More preferably, the lower end of the second frame 251 also extends outward along a plane to form a second extension 251b, which can be sealingly bonded to the upper surface of the first extension 252b by a second adhesive (not shown).

[0051] Please see Figure 5In the second embodiment, preferably, a generally vertically extending third extension 252g may be formed at the upper end of the first frame 252. The third extension 252g is integrally connected to the body 252a of the first frame 252 via a ring of support portions 252c. The body 251a of the second frame 251 may extend vertically, and the lower end of the body 251a may abut against the middle of the support portion 252c. The gap between the body 251a, the third extension 252g, and the groove 252d is filled with a third adhesive 250, so that the body 251a of the first frame 251 can be sealed to the third extension 252g by the third adhesive 250. In some other embodiments, the lower end of the body 251a of the first frame 251 may also extend outward relative to the upper end, for example, it may be a cone-shaped tube with the apex pointing upward. The lower end of the body 251a can abut against the outer edge of the support portion 252c, or be tightly fitted to the inner wall of the third extension portion 252g. Preferably, the protective gel 5 is lower than the upper edge of the body 252a. In this way, when the lower end of the body 251a is tightly fitted to the inner wall of the third extension portion 252g, since the body 252a and the third extension portion 252g are integrally connected by the support portion 252c, the measurement error caused by the installation stress generated by the tight fit or threaded fit being transmitted to the protective gel 5 filled in the body 252a can be reduced.

[0052] Preferably, the support portion 252c may be recessed downwards to form a groove 252d. The inner peripheral wall of the body 251a may abut against the inner wall 252e of the groove 252d. Part or all of the third adhesive 250 is contained in the groove 252d. This reduces the risk of the third adhesive 250 overflowing into the cavity of the first frame 251 and further reduces the transmission of installation stress to the body 252a.

[0053] Please see Figure 6 In the third embodiment, the upper part of the body 252a of the second frame 251 extends vertically and can be tightly or threadedly fitted to the inner wall of the third extension 252g. After the upper part of the body 252a contracts inward, it forms a gap with the third extension 252g to accommodate at least a portion of the third adhesive 250. The lower end of the body 251a of the second frame 251 rests downward against the support 252c, specifically, it can rest against the bottom of the groove 252d.

[0054] In the above embodiments, the first frame 252 is preferably made of metal, which provides additional electromagnetic shielding for the pressure-sensitive element 20 and the lead wire 24. Preferably, the second frame 251 can also be made of metal, so that electrical contact can be formed between the first frame 252 and the second frame 251, thereby providing complete electromagnetic shielding for the pressure-sensitive element 20 and the lead wire 24. In the first embodiment, the second frame 251 can be made of metal, and the first frame 252 can be made of metal or not, which also provides complete electromagnetic shielding. The lower end of the body 251a of the second frame 251 can be tilted outward relative to the upper end, which can relatively reduce the additional pressure on the pressure-sensitive element caused by the weight of the protective gel 5 itself, as well as the pressure fluctuations that may occur due to vibration.

[0055] Preferably, the first frame 252 and / or the second frame 251 are thin-shell-shaped elements obtained by stamping.

[0056] Preferably, to further ensure reliable electrical contact between the first frame 252 and the second frame 251, the third adhesive 250 can be a conductive adhesive. Similarly, the second adhesive can also be a conductive adhesive. More preferably, the first adhesive can also be a conductive adhesive, in which case the first frame 252 can be electrically connected to a ground terminal of the measurement circuit through the conductive adhesive.

[0057] This application also provides a method for manufacturing a pressure measuring component 2, which includes:

[0058] A substrate 21 is provided, on which at least one pressure-sensitive element 20 and a measuring circuit electrically connected to the pressure-sensitive element 20 via a lead 24 are disposed on the upper side, and at least one pressure via 21a is disposed on the substrate 21 penetrating both sides. The pressure-sensitive element 20 is correspondingly sealed on the upper side of the pressure via 21a;

[0059] At least one first frame 252 with an opening 252f at the upper end is provided, the lower end of the first frame 252 is sealed to the upper side of the substrate 21 by a first adhesive, and the pressure sensitive element 20 is surrounded inside a first frame 252.

[0060] A protective gel 5 is filled inside the first frame 252 so that the protective gel 5 at least covers the corresponding pressure-sensitive element 20 and lead wire 24;

[0061] Under negative pressure, the protective gel 5 is degassed.

[0062] At least one second frame 251 is provided having a cover 251c, wherein the cover 251c is provided with a vent 251d for passing through the upper and lower sides of the cover 251c.

[0063] The lower end of the second frame 251 is sealed to the first frame 252 by a second adhesive.

[0064] Provide at least one waterproof and breathable membrane 4 and adhere it to the outer surface of the cover 251c.

[0065] The pressure measuring component 2 manufactured by the above method can protect the pressure sensitive element 20 and the lead wire 24 separately through the frame component 25, while also allowing the protective gel filled in the frame component 25 to smoothly and efficiently expel air bubbles, thereby reducing the measurement error of the pressure sensor.

[0066] The scope of this disclosure is not limited by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be included in this disclosure.

Claims

1. A frame assembly (25), characterized in that, include: A first frame (252) has an opening (252f) at its upper end, and its interior is filled with protective gel (5); A second frame (251) is fixed to the first frame (252), which has a cover (251c) that covers the opening (252f), and the cover (251c) is provided with a vent (251d) for passing through the upper and lower sides of the cover (251c). A waterproof and breathable membrane (4) is attached to a flat mounting surface on one side of the cover (251c) to seal the corresponding end of the vent (251d).

2. The frame assembly (25) according to claim 1, characterized in that, It also includes at least one adhesive, which includes a first adhesive, wherein the lower end of the first frame (252) extends outward along a plane to form a first extension (252b) for sealingly bonding to an external element by the first adhesive.

3. The frame assembly (25) according to claim 2, characterized in that, The adhesive also includes a second adhesive, and a second extension (251b) is formed by extending outward from the lower end of the second frame (251) along the plane for sealingly bonding to the first extension (252b) by the second adhesive.

4. The frame assembly (25) according to claim 1, characterized in that, It also includes at least one adhesive, the adhesive including a third adhesive, the upper end of the first frame (252) forms a vertically extending third extension (252g), the third extension (252g) is integrally connected to the body of the first frame (252) through a ring of support (252c), the lower end of the first frame (252) abuts against the support (252c); the first frame (252) is sealed to the third extension (252g) by the third adhesive (250).

5. The frame assembly (25) according to claim 4, characterized in that, The support portion (252c) is recessed downward to form a groove (252d), and at least a portion of the third adhesive (250) is contained in the groove (252d).

6. The frame assembly (25) according to claim 4, characterized in that, The second frame (251) also includes a ring body integrally connected to the outer edge of the cover (251c), and the lower part of the body of the second frame (251) forms a tight fit or threaded fit with the third extension (252g).

7. The frame assembly (25) according to any one of claims 2 to 6, characterized in that, At least one of the adhesives is a conductive adhesive.

8. The frame assembly (25) according to any one of claims 1 to 6, characterized in that, The first frame (252) and / or the second frame (251) are metal parts.

9. The frame assembly (25) according to any one of claims 1 to 6, characterized in that, The first frame (252) and / or the second frame (251) are thin-shell metal parts formed by stamping.

10. A pressure measuring component (2), characterized in that, include: A substrate (21) has at least one pressure-sensitive element (20) and a measurement circuit electrically connected to the pressure-sensitive element (20) via a lead (24) on one side. At least one pressure via (21a) is provided on the substrate (21) through both sides. The pressure-sensitive element (20) is correspondingly blocked on one side of the pressure via (21a). and at least one frame assembly (25) according to any one of claims 1 to 8, which is fixed to the side of the substrate (21) where the pressure-sensitive element (20) is disposed and surrounds the pressure-sensitive element (20) and the lead wire (24) therein, the protective gel (5) covering the pressure-sensitive element (20) and the lead wire (24).

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