Cable connection structure and pressure sensor

Abstract

The utility model discloses a cable connection structure suitable for a pressure sensor or other electronic devices. The cable connection structure comprises a housing; the electronic module assembly is arranged in the shell; the cable comprises a plurality of wire harnesses penetrating through the shell from far to ground, a U-shaped part is formed at the near end of a main body part of each wire harness, each U-shaped part comprises a first longitudinal extension part, a bent part and a second longitudinal extension part which are sequentially connected from the near end to the far end, and the first longitudinal extension parts are welded to the electronic module assembly; the distal end of the main body portion of the wire harness extends toward a side away from the first longitudinal extension portion. According to the cable connection structure, the pulling resistance of the cable can be greatly improved.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a cable connection structure and a pressure sensor. Background Art

[0002] The electronic module assembly inside the pressure sensor can be connected to a relatively fixed external device via pins provided on the housing to power the electronic module and lead out the electrical signals processed by the electronic module assembly. For external devices or interfaces that are relatively loose in position, it is best to use cables to achieve power supply and signal transmission. When using cables, the solder joints can easily fall off when the cables are pulled by excessive tension during production and installation. In the prior art, a plug fixed to the outside of the cable is usually used to clamp onto the housing to prevent the cable from being pulled off. This cable connection structure is relatively complex and difficult to manufacture and assemble. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the present application provides a cable connection structure to improve its anti-pulling ability.

[0004] To achieve the above objectives, the present application provides the following technical solution: a cable connection structure, comprising:

[0005] case;

[0006] an electronic module assembly disposed inside the housing;

[0007] And a cable including multiple wiring harnesses passing through the shell from far to far, the proximal end of the main body of the wiring harness forms a U-shaped portion, the U-shaped portion includes a first longitudinal extension portion, a bending portion and a second longitudinal extension portion connected in sequence from the proximal end to the distal end, the first longitudinal extension portion is welded to the electronic module assembly; the distal end of the main body of the wiring harness extends toward a side away from the first longitudinal extension portion.

[0008] Preferably, the inner wall of the housing is laterally against a side of the second longitudinal extension portion away from the first longitudinal extension portion.

[0009] Preferably, the shell includes a main shell with an opening at one longitudinal end and an upper cover connected to the opening, and the second longitudinal extension portion passes through the upper cover longitudinally.

[0010] Preferably, the proximal end of the first longitudinal extension portion faces one side of the upper cover.

[0011] Preferably, the proximal end of the first longitudinal extension portion faces away from the upper cover, and the main body of the wire harness passes through the side wall of the housing transversely.

[0012] Preferably, opposite side edges of the upper cover extend toward one side of the main shell to form buckles, and the buckles are connected to outer sides of corresponding side walls of the main shell.

[0013] The present invention further claims protection for a pressure sensor, wherein the cable connection structure is as described above, wherein the electronic module assembly includes a pressure measurement assembly, and the pressure measurement assembly includes:

[0014] A pressure sensitive element coupled to the medium to be measured through a pressure introduction channel;

[0015] a first circuit board fixed inside the housing, on which is disposed a first processing circuit connected to the pressure sensitive element via leads;

[0016] and a second circuit board fixed inside the shell and located on a side of the first circuit board away from the pressure introduction channel, which is electrically connected to the first processing circuit through a flexible circuit board; the wiring harness is vertically welded to the second circuit board.

[0017] Preferably, a plurality of first supporting parts for supporting the second circuit board are provided inside the main housing.

[0018] Preferably, two opposite side walls of the main housing protrude inwardly to form inner protrusions to form a second supporting portion whose top surface passes over a side surface of the second circuit board away from the first circuit board.

[0019] Preferably, the pressure sensitive element is a gauge pressure sensitive element, and the air-permeable gap between the wiring harness and the housing on the side of the pressure sensitive element away from the pressure introduction channel is communicated with the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a top view of the pressure sensor of the first embodiment;

[0021] Figure 2 The pressure sensor of the first embodiment is Figure 1 A cross-sectional view of AA shown in FIG;

[0022] Figure 3 The pressure sensor of the first embodiment is Figure 1 A cross-sectional view of BB shown in ;

[0023] Figure 4 is a perspective schematic diagram of the pressure sensor of the first embodiment;

[0024] Figure 5 This is a three-dimensional schematic diagram of the pressure sensor of the first embodiment with the upper cover hidden;

[0025] Figure 6This is a three-dimensional schematic diagram of the pressure sensor according to the first embodiment with the flexible circuit board 26 and the circuit board 22 further hidden;

[0026] Figure 7 Schematic diagram of the combination of the frame assembly and the circuit board 21 of the second embodiment;

[0027] Figure 8 for Figure 7 An enlarged schematic diagram of the local C shown in FIG;

[0028] Figure 9 Schematic diagram of the combination of the frame assembly and the circuit board 21 of the third embodiment;

[0029] Figure 10 Schematic diagram of the combination of the frame assembly and the circuit board 21 of the third embodiment;

[0030] Explanation of reference numerals: 11, pressure introduction channel; 12, interface tube; 13, positioning structure; 14, mounting plane; 15, recessed portion; 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 portion; 31b, connecting portion; 31c, buckle portion; 31, first buckle; 32, second buckle; 3, connecting structure; 4, waterproof and breathable membrane; 5, protective gel ; 61, transverse portion; 62, longitudinal portion; 63, elastic portion; 6, electrical connection terminal; 250, third adhesive; 251a, body; 251b, second extension; 251c, cover; 251d, vent; 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 DESCRIPTION

[0031] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The following embodiments are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. In the following description, the same reference numerals are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0032] In the description of this application, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of this application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0033] In addition, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0034] It should be further understood that the term “and / or” used in this specification and the corresponding claims refers to any and all possible combinations of one or more of the listed items.

[0035] Please refer to Figures 1 to 6 . In the first embodiment, the cable connection structure includes a shell (unmarked), an electronic module assembly (unmarked) is installed inside the shell, and the electronic module assembly includes a pressure measuring assembly 2, and the pressure measuring assembly 2 includes at least one pressure sensitive element 20 and at least one circuit board 22. The pressure sensitive element 20 is coupled to the medium to be measured through a pressure introduction channel 120 provided on the shell to obtain the pressure of the medium to be measured. The specific type of the pressure sensitive element 20 does not need to be limited. For example, in this embodiment, it can be a piezoresistive semiconductor pressure sensitive element; in some other schemes, the pressure sensitive element 20 can also be a metal diaphragm pressure sensitive element with a larger area or a capacitive pressure sensitive element, one side of which can be directly coupled to the medium to be measured in a manner exposed to the medium to be measured. In this embodiment, the pressure sensor includes the above-mentioned cable connection structure.

[0036] Among them, the circuit board 22 can be fixed inside the shell along a transverse plane. The pressure sensor also includes a cable 8, and the cable 8 includes a plurality of wire harnesses 81, and the end of the wire harness 81 close to the shell (defined as the proximal end) forms a U-shaped portion 810. The proximal end of the U-shaped portion 810 is vertically soldered to the circuit board 22 toward the inside of the pressure sensor, for example, soldered to the conductive hole 22b provided on the circuit board 22 to form a solder joint 81d, wherein the solder joint 81d can be located. The conductive hole 22b can also be referred to as a metallized via. Specifically, the U-shaped portion 810 can include a bend portion 81c (also referred to as a U-shaped bend) with the proximal and distal directions turned 180°, and the proximal end of the bend portion 81c continues to extend to form a longitudinal ( Figure 2 The distal end of the bent portion 81c extends further to form the first longitudinal extension portion 81a (in the vertical direction) and the second longitudinal extension portion 81b. In other words, the first longitudinal extension portion 81a and the second longitudinal extension portion 81b have adjacent ends that are turned 180 degrees by the bent portion 81c.

[0037] The shell may include a main shell 1 with an opening at the upper end and an upper cover 7 connected to the opening. The first longitudinal extension portion 81a and the bending portion 81c are located inside the shell, and the distal end of the second longitudinal extension portion 81b passes upward through the first yield portion 72 provided on the upper cover 7 and then continues to extend distally to form the main body 81e of the wiring harness 81. The wiring harness 81 may include a core wire 811 and a protective layer 812 wrapped around the core wire 811. The main body 81e of the above-mentioned multiple wiring harnesses 81 may be covered with a wire collection sleeve 83. In some other schemes, the first yield portion 72 may also be provided on the main shell 1.

[0038] The main body 81e of the harness 81 may extend laterally toward the side of the second longitudinal extension portion 81b away from the first longitudinal extension portion 81a, for example, it may extend laterally (ie, Figure 2 ), or it may extend obliquely at an acute angle to the transverse direction (as shown in FIG. Figure 2 (Indicated by the dashed arrow in the figure). Thus, when the distal end of wire harness 81 is pulled, especially generally to the left, the tensile force transmitted through U-shaped portion 810 to the proximal end soldered to conductive via 22b is much smaller. This is because U-shaped portion 810 can compensate for lateral displacement due to its own flexibility. On the other hand, solder joint 81d can withstand much greater tensile forces along the direction in which the circuit board extends than forces perpendicular to the direction in which circuit board 22 extends.

[0039] Therefore, this cable connection structure can effectively prevent the cable 8 from being pulled off from the circuit board 22 .

[0040] More specifically, the inner wall of the housing may be laterally against a side of the second longitudinal extension 81b that is away from the first longitudinal extension 81a ( Figure 2 In this way, when the distal end of the wiring harness 81 is pulled, its lateral force component can be offset to a considerable extent and friction can be formed to offset part of the longitudinal force component, thereby further reducing the risk of the solder joint 81d between the cable 8 and the circuit board 22 being pulled off, especially when the wiring harness 81 has a certain rigidity. The so-called "certain rigidity" means that the rigidity of the wiring harness 81 can maintain its shape by itself and has a certain resistance to external forces in a direction other than its own extension direction (also called axial direction). In other words, the wiring harness 81 is preferably not completely flexible. Among them, the first yielding portion 72 can be a notch provided on the edge of the upper cover 7. Specifically, the main shell 1 may include a main body 11 and a longitudinal side ( Figure 2 The first longitudinal extension portion 81b is formed by extending from the housing 15 (the upper side of the housing 15), and the second longitudinal extension portion 81b is laterally against the left inner wall of the housing 15. In some other embodiments, the first relief portion 72 can also be a hole provided on the upper cover 7. A breathable gap 72a is left between the first relief portion 72 and the wiring harness 81. The ambient reference pressure of the pressure sensor can be communicated to the interior of the housing through the above-mentioned breathable gap 72a and the second relief portion 22a. The side of the pressure sensitive element 20 away from the pressure introduction channel 120 obtains the reference pressure inside the housing through the waterproof breathable membrane 254. In this case, the pressure sensitive element can be a gauge pressure sensitive element.

[0041] In this embodiment, the pressure measurement assembly 2 may further include a generally transversely extending circuit board 21. The circuit board 21 is sealed against one inner end of the pressure introduction channel 120, which may be defined by the inner cavity of a mouthpiece 12 extending downward from the main body 11. A pressure through-hole 21a extending vertically through the circuit board 21 is provided. The lower end of the pressure through-hole 21a communicates with the inner end of the pressure introduction channel 120. The pressure sensitive element 20 is sealed against the upper end of the pressure through-hole 21a and is electrically connected to a first processing circuit (not labeled) disposed on the upper surface of the circuit board 21 via a lead 24. The first processing circuit on the circuit board 21 may be electrically connected to a second processing circuit (not labeled) including conductive holes 22b disposed on the upper surface of the circuit board 22 via a flexible circuit board 26. The circuit board 22 may be provided with a second clearance portion 22a for the flexible circuit board 26 to pass upward therethrough. In other embodiments, the second clearance portion 22a may also be disposed on the main housing 1. The circuit board 22 is further provided with a third paving portion 22 c for the second longitudinal extension portion 81 b to pass through. The third paving portion 22 c may also be provided on the main housing 1 .

[0042] The pressure-sensitive element 20 and leads 24 can be enclosed within a frame assembly 25 fixed to the upper surface of the circuit board 21. The lower portion of the inner cavity of the frame assembly 25 is filled with a protective gel 253 that covers at least the pressure-sensitive element 20 and leads 24. The protective gel can also cover other circuit components of the first processing circuit, such as a conditioning chip. The protective gel 253 can be exposed to the interior of the housing or connected to the interior of the housing through a vent provided on a cover portion of the frame assembly 25. The frame assembly 25 can also include a waterproof, breathable membrane covering the vent 251d.

[0043] The main body 11 of the main housing 1 may be in the shape of a substantially transversely extending plate, on which a mounting hole (not marked) is provided, in which a bushing 111 is fixed for mechanical fixation with external equipment.

[0044] To facilitate securing the circuit boards 21 and 22 within the housing, several first support portions 14, preferably substantially cylindrical, may be provided within the main housing 1. These first support portions 14 are preferably located at the corners of the housing wall 15. For example, the housing wall 15 may have a rectangular cross-section, with the main body 11 extending toward one side of the housing wall 15 to form first support portions 14 integrally connected to the four corners of the housing wall 15. The bottom of the circuit board 22 is supported on the top surface 14a of the first support portion 14 and may be secured thereto by adhesive bonding. The circuit board 22 may be positioned circumferentially by the inner wall of the housing wall 15, preferably abutting the inner wall 15 toward the left to prevent the circuit board 22 from being pulled off the top surface 14a.

[0045] The circuit board 22 can be fixed in a first receiving groove 16a formed by the upper surface of the main body 11 by bonding or other known methods. The edge of the first receiving groove 16a can be relatively upwardly protruding to form a positioning protrusion 16 for positioning the circuit board 21 in the lateral direction. The opposite side edges of the upper cover 7 can extend downward to form a buckle 71, and the buckle 71 is buckled and connected to the corresponding two side outer walls of the shell wall 15. For example, the corresponding outer wall of the shell wall 15 protrudes outward to form a protrusion 15b. The buckle 71 is plate-shaped and has a buckle hole 71a formed thereon. The protrusion 15b is snapped into the 71a outward. The inner side of the buckle 71 can form an outwardly inclined guide slope 71b, and accordingly, the outer side of the protrusion 15b can form an inwardly inclined guide slope (not marked). The corresponding two side outer walls of the shell wall 15 can be recessed inward to form a second receiving groove 15a for accommodating the buckle 71 (see for details). Figure 6The middle portions of the corresponding outer walls of the housing 15 may be relatively inwardly convex to form second support portions 151. The top surfaces 151a of the second support portions 151 are relatively sunken but extend upward over the circuit board 22 to support the upper cover 7. Specifically, the corresponding edges of the circuit board 22 are recessed inward to form positioning notches 22d that mate with the second support portions 151.

[0046] In order to avoid interference between the cable 8 and the flexible circuit board 26, the second support portion 151, the buckle 71 and the positioning protrusion 16 and to make the overall arrangement more compact, the cable 8 and the second clearance portion 22a can be arranged at Figure 2 The left and right sides of the second support portion 151 and the buckle 71 are arranged on Figure 2 At the front and rear sides, at the same time, the positioning protrusions 16 can be set to two and extend left and right, so as to limit the circuit board 21 at the front and rear ends, and the circuit board 21 can be limited left and right by the cooperation of the second support part 151 and the positioning notch 22d. In addition, a groove 16b extending front and back can be provided between the positioning protrusion 16 and the front and rear side walls of the shell wall 15 to avoid the risk of deformation of the shell wall 15 due to being too thick during injection molding. Among them, the other parts of the upper cover 7 except the buckle 71 can be completely surrounded by the shell wall 15, and its upper end surface can be flush with the top of the shell wall 15. Similarly, the outer surface of the buckle 71 can be flush with the corresponding outer wall surface of the shell wall 15. In addition, the outer wall of the shell wall 15 and the upper side surface of the main body 11 can be integrally connected through several ribs 17.

[0047] In order to protect the electronic components on the upper surface of the circuit board 21, a layer of first protective glue (not shown) can be covered on the upper surface of the circuit board 21, and a layer of second protective glue 91 can be covered outside the solder joint 81d. In addition, a layer of third protective glue 92 can be covered on the connection between the flexible circuit board 26 and the circuit board 21.

[0048] In some other variations of the embodiment, the main body of the harness 81 can pass through the through hole provided on the left side wall of the shell wall 15. Figure 2 The cable 8 and circuit board 22 shown in the figure can also be turned upside down. In this case, the main body of the wiring harness 81 can pass outward through the through hole provided in the left side wall of the shell 15, and the first longitudinal extension portion 81a can pass downward through the conductive hole 22b and weld to the lower surface of the circuit board 21 to form a solder joint. The bent portion 81c is located on the upper side of the circuit board 22. This can also prevent the cable 8 from being pulled off; and additionally, a fixing plug mounted on the outside of each wiring harness 81 can be fixed in the through hole to further prevent the risk of the cable 8 being pulled off.

[0049] In the above embodiments, it is easy to understand that the purpose of providing the circuit board 21 and the circuit board 22 is to ensure that there is enough space to arrange circuit elements. When the lateral available area of ​​the pressure sensor is sufficient, the pressure sensor can omit the circuit board 22 and the associated structures (flexible circuit board 26, first support portion 14, etc.), and the first longitudinal extension portion 81a is directly welded to the circuit board 21 to form a solder joint.

[0050] See also Figures 7 and 8 In the second embodiment, the frame assembly 25 may include at least one first frame 252 corresponding to the pressure sensitive element 20 , with an opening 252 f at the upper end thereof and a protective gel 253 filled therein.

[0051] Preferably, the frame assembly 25 may further include at least one second frame 251 and at least one waterproof breathable membrane 254. The second frame 251 is assembled and fixed to the corresponding first frame 252. The second frame 251 has a cover 251c that covers the opening 252f. The cover 251c is provided with a vent 251d that passes through the upper and lower sides of the cover 251c. The waterproof breathable membrane 254 is bonded to a substantially flat mounting surface provided on the inner side of the cover 251c, thereby covering the upper end of the vent 251d; in some other embodiments, the waterproof breathable membrane 254 can also be provided on the lower surface of the cover 251c by other means, thereby covering the lower end of the vent 251d.

[0052] Preferably, the lower end of the first frame 252 extends outward along a plane to form a circle of first extension portions 252b. The first extension portions 252b can be more firmly and hermetically bonded to the upper surface of the circuit board 21 using a first adhesive (not shown). More preferably, the lower end of the second frame 251 also extends outward along a plane to form a circle of second extension portions 251b. The second extension portions 251b can be hermetically bonded to the upper surface of the first extension portions 252b using a second adhesive (not shown).

[0053] See also Figure 9In the third embodiment, preferably, a third extension portion 252g extending substantially vertically may be formed at the upper end of the first frame 252. The third extension portion 252g is integrally connected to the main body 252a of the first frame 252 via a ring of support portions 252c. The main body 251a of the second frame 251 may extend vertically, with the lower end of the main body 251a supporting the middle portion of the support portion 252c. The gap between the main body 251a, the third extension portion 252g, and the groove 252d is filled with a third adhesive 250. In this way, the main body 251a of the first frame 251 may be sealingly bonded to the third extension portion 252g via the third adhesive 250. In other embodiments, the lower end of the main body 251a of the first frame 251 may also extend outwardly at an angle relative to the upper end, for example, in the shape of a cone with the top facing upward. The lower end of the body 251a can rest against the outer edge of the support portion 252c, or fit snugly against the inner wall of the third extension portion 252g. Preferably, the protective gel 253 is positioned lower than the upper edge of the body 252a. This allows the support portion 252c to integrally connect the body 252a and the third extension portion 252g, minimizing measurement errors caused by the tight or threaded fit of the installation stress transferred to the protective gel 253 within the body 252a.

[0054] Preferably, the support portion 252c can be recessed downward to form a circular groove 252d. The inner peripheral wall of the body 251a can be supported against the inner wall 252e of the groove 252d. A portion or all of the third adhesive 250 is contained within the groove 252d. This reduces the risk of the third adhesive 250 overflowing into the inner cavity of the first frame 251 and further reduces the transmission of installation stress to the body 252a.

[0055] See also Figure 10 In the fourth embodiment, the upper portion of the main body 252a of the second frame 251 extends vertically, and can be tightly or threadably fitted onto the inner wall of the third extension 252g. The upper portion of the main body 252a contracts inward, creating a gap between the main body 252a and the third extension 252g for accommodating at least a portion of the third adhesive 250. The lower end of the main body 251a of the second frame 251 rests downwardly on the support portion 252c, specifically, on the bottom of the groove 252d.

[0056] In each of the above embodiments, the first frame 252 is preferably a metal member. The first frame 252 can provide additional electromagnetic shielding for the pressure sensitive element 20 and the leads 24. Preferably, the second frame 251 can also be a metal member. In this way, the first frame 252 can form electrical contact with the second frame 251 by supporting it, so that the frame assembly 25 can additionally provide complete electromagnetic shielding for the pressure sensitive element 20 and the leads 24. In the first embodiment, the second frame 251 can be a metal member, and the first frame 252 can be a metal member or not, so as to still provide complete electromagnetic shielding. The lower end of the main body 251a of the second frame 251 can be tilted outward relative to the upper end. This can relatively reduce the additional pressure applied to the pressure sensitive element by the weight of the protective gel 253 itself, as well as pressure fluctuations caused by vibration.

[0057] Preferably, the first frame body 252 and / or the second frame body 251 are thin shell-shaped elements obtained by stamping.

[0058] 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 this case, the conductive adhesive can be used to electrically connect the first frame 252 to a ground terminal of the measurement circuit.

[0059] The present application also provides a method for manufacturing a pressure measurement assembly 2, which includes:

[0060] A circuit board 21 is provided, with at least one pressure sensitive element 20 and a measurement circuit electrically connected to the pressure sensitive element 20 via leads 24 disposed on its upper side. At least one pressure via 21a is provided on the circuit board 21, extending through both sides of the circuit board. The pressure sensitive element 20 is correspondingly sealed on the upper side of the pressure via 21a.

[0061] Provide at least one first frame 252 having an opening 252f at its upper end, seal the lower end of the first frame 252 to the upper side of the circuit board 21 with a first adhesive, and enclose the pressure sensitive element 20 within the first frame 252;

[0062] Filling the first frame 252 with a protective gel 253 so that the protective gel 253 at least covers the corresponding pressure sensitive element 20 and the lead 24;

[0063] Exhausting the protective gel 253 under negative pressure;

[0064] At least one second frame 251 having a cover 251c is provided, wherein the cover 251c is provided with a vent hole 251d for penetrating the upper and lower sides of the cover 251c;

[0065] The lower end of the second frame 251 is sealedly connected to the first frame 252 by a second adhesive;

[0066] At least one waterproof breathable membrane 254 is provided and bonded to the outer surface of the cover portion 251c.

[0067] In the prior art, to protect the fragile pressure chip and the leads connecting to the measurement circuit, a frame is typically used to surround the pressure chip and leads. The frame is then filled with a protective gel to protect them from mechanical and chemical influences. While omitting the cover to simplify the structure of the aforementioned pressure sensor, the protective gel, used to protect both the pressure chip and leads, presents a challenge: the pressure chip and leads still need to be isolated from external moisture. If these are isolated from the outside environment by a frame with vents, the vents must be covered with a waterproof, breathable membrane. The protective gel requires vacuum degassing to remove any bubbles trapped within it. However, due to the high viscosity of the gel, complete bubble removal is difficult. When using such a frame, we found that the available vent size was insufficient to ensure smooth degassing due to limitations in the sensor's size, circuit board area, and the adhesive width of the waterproof, breathable membrane's edges. This can lead to measurement errors or require significantly longer degassing times.

[0068] Compared with the existing technology, the pressure measurement component 2 manufactured by the above-mentioned manufacturing method can, while separately protecting the pressure sensitive element 20 and the lead 24 through the frame component 25, enable the protective gel filled in the frame component 25 to smoothly and efficiently discharge bubbles, thereby reducing the measurement error of the pressure sensor.

[0069] It should be noted that the cable connection structure in this application is applicable not only to the aforementioned pressure sensor, but also to other types of sensors that measure other physical quantities (such as temperature sensors, etc.). Furthermore, it is also applicable to other electronic devices other than sensors. When the aforementioned cable connection structure is applicable to other types of sensors, the aforementioned pressure measurement assembly can be replaced with other types of sensitive elements (such as temperature sensitive elements).

[0070] The scope of the disclosure is defined not by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are construed as being included in the disclosure.

Claims

1. A cable connection structure, characterized in that: include: case; an electronic module assembly disposed inside the housing; And a cable including multiple wiring harnesses passing through the shell from far to near, the proximal end of the main body of the wiring harness forms a U-shaped portion, the U-shaped portion includes a first longitudinal extension portion, a bending portion and a second longitudinal extension portion connected in sequence from the proximal end to the distal end, the first longitudinal extension portion is welded to the electronic module assembly; the distal end of the main body of the wiring harness extends toward a side away from the first longitudinal extension portion.

2. The cable connection structure according to claim 1, wherein: The inner wall of the housing is laterally against a side of the second longitudinal extension portion away from the first longitudinal extension portion.

3. The cable connection structure according to claim 1, wherein: The shell includes a main shell with an opening at one longitudinal end and an upper cover connected to the opening, and the second longitudinal extension portion passes through the upper cover longitudinally.

4. The cable connection structure according to claim 3, characterized in that: The proximal end of the first longitudinal extension portion faces one side of the upper cover.

5. The cable connection structure according to claim 3, characterized in that: The proximal end of the first longitudinal extension portion faces away from the upper cover, and the main body of the wire harness passes through the side wall of the housing transversely.

6. The cable connection structure according to claim 3, characterized in that: The opposite side edges of the upper cover extend toward one side of the main shell to form buckles, and the buckles are connected to the outer sides of the corresponding side walls of the main shell.

7. A pressure sensor, characterized in that: The cable connection structure according to any one of claims 1 to 6, wherein the electronic module assembly includes a pressure measurement assembly, and the pressure measurement assembly includes: A pressure sensitive element coupled to the medium to be measured through a pressure introduction channel; a first circuit board fixed inside the housing, on which is disposed a first processing circuit connected to the pressure sensitive element via leads; and a second circuit board fixed inside the shell and located on a side of the first circuit board away from the pressure introduction channel, which is electrically connected to the first processing circuit through a flexible circuit board; the wiring harness is vertically welded to the second circuit board.

8. The pressure sensor according to claim 7, characterized in that A plurality of first supporting parts for supporting the second circuit board are provided inside the main housing.

9. The pressure sensor according to claim 7, characterized in that The opposite side walls of the main housing protrude inward to form inner protrusions to form a second supporting portion whose top surface passes over a side surface of the second circuit board away from the first circuit board.

10. The pressure sensor according to any one of claims 7 to 9, characterized in that The pressure sensitive element is a gauge pressure sensitive element, and the air-permeable gap between the wiring harness and the housing on a side of the pressure sensitive element away from the pressure introduction channel is communicated with the environment.

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