Cable connection structure and pressure sensor

Abstract

The invention 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 setting through the pins set on the shell to power the electronic module and lead out the electrical signal processed by the electronic module assembly. For external devices or interfaces with relatively loose positions, it is best to use cables to realize power supply and signal transmission. When using cables, the solder joints are easily detached 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 the cable on the shell to prevent the cable from being pulled off. This cable connection structure is relatively complex and difficult to manufacture and assemble. Summary of the invention

[0003] In view of the deficiencies of the prior art, 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 solutions: 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, an 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 comprises a main shell having 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 the outer sides of the corresponding side walls of the main shell.

[0013] The present invention also 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 a first processing circuit connected to the pressure sensitive element via a lead is disposed;

[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 arranged 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 connected to 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 three-dimensional schematic diagram of the pressure sensor of the first embodiment;

[0024] Figure 5 It 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 of the first embodiment with the flexible circuit board 26 and the circuit board 22 further hidden;

[0026] Figure 7 It is a 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] Fig. 9 It is a schematic diagram of the combination of the frame assembly and the circuit board 21 of the third embodiment;

[0029] Fig.10 It is a 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 shell; 20, pressure sensitive element; 21a, pressure through hole; 21b, conductive hole; 21, substrate; 23, electronic component; 24, lead wire; 2, pressure measurement component; 31a, cantilever portion; 31b, connecting portion; 31c, buckle portion; 31, first buckle; 32, second buckle; 3, connecting structure; 4, waterproof 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 portion; 251c, cover; 251d, vent; 251, second frame; 252a, body; 252b, first extension portion; 252c, support portion; 252d, groove; 252e, inner wall of groove; 252f, opening; 252g, third extension portion; 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 cannot be interpreted as limiting the present application. In the following description, the same symbols are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0032] In the description of the present 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 the present application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application 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 operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

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

[0035] Please refer to Figure 1 to Figure 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 measurement assembly 2, and the pressure measurement 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 wiring harnesses 81, and the end of the wiring 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 welded to the circuit board 22 toward the inside of the pressure sensor, for example, welded 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 may include a bend 81c (also referred to as a U-shaped bend) with the proximal and distal directions turned 180°, and the proximal end of the bend 81c continues to extend to form a longitudinal ( Figure 2 The first longitudinal extension portion 81a (in the vertical direction) is formed, and the distal end of the bent portion 81c continues to extend to form a second longitudinal extension portion 81b in the longitudinal direction. In other words, the adjacent ends of the first longitudinal extension portion 81a and the second longitudinal extension portion 81b are turned 180 degrees through 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 yielding portion 72 provided on the upper cover 7 and then continues to extend to the distal end 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 yielding portion 72 may also be provided on the main shell 1.

[0038] The main body 81e of the wire harness 81 may extend laterally toward a 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 a certain acute angle to the transverse direction (as shown in FIG. Figure 2 Thus, when the distal end of the harness 81 is pulled, especially when it is pulled substantially to the left, the pulling force transmitted to the proximal end welded to the conductive hole 22b through the U-shaped portion 810 is much smaller, because the U-shaped portion 810 can compensate for the lateral pulling displacement through its own flexibility. On the other hand, the pulling force that the solder joint 81d can withstand in the direction along which the circuit board extends is much greater than the force perpendicular to the direction in which the circuit board 22 extends.

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

[0040] More specifically, the inner wall of the housing may be laterally against a side of the second longitudinal extension portion 81b that is away from the first longitudinal extension portion 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 force 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 referred to as the 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 arranged 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 to 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 schemes, the first relief portion 72 can also be a hole set on the upper cover 7. There is a breathable gap 72a between the first relief portion 72 and the wiring harness 81. The environmental reference pressure of the pressure sensor can be connected to the inside 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. At this time, the pressure sensitive element can be a gauge pressure sensitive element.

[0041] In this embodiment, the pressure measurement assembly 2 may further include a circuit board 21 extending substantially transversely, the circuit board 21 being blocked at one end of the inner side of the pressure introduction channel 120, and the pressure introduction channel 120 may be defined by the inner cavity of an interface tube 12 formed by the main body 11 extending downward. The circuit board 21 is provided with a pressure through hole 21a extending upward and downward, the lower end of the pressure through hole 21a is connected to one end of the inner side of the pressure introduction channel 120, the pressure sensitive element 20 is blocked at the upper end of the pressure through hole 21a, and is electrically connected to a first processing circuit (not marked) provided on the upper surface of the circuit board 21 through a lead 24. The first processing circuit on the circuit board 21 may be electrically connected to a second processing circuit (not marked) including a conductive hole 22b on the upper surface of the circuit board 22 through a flexible circuit board 26. Among them, the circuit board 22 may be provided with a second clearance portion 22a for the flexible circuit board 26 to pass upward, and in some other schemes, the second clearance portion 22a may also be provided on the main housing 1. The circuit board 22 is further provided with a third paving portion 22 c through which the second longitudinal extension portion 81 b can pass upward and downward. The third paving portion 22 c can also be provided on the main housing 1 .

[0042] The pressure sensitive element 20 and the lead 24 may be enclosed in a frame assembly 25 fixed to the upper surface of the circuit board 21, and the lower part of the inner cavity of the frame assembly 25 is filled with a protective gel 253 for at least covering the pressure sensitive element 20 and the lead 24. The protective gel may also cover other circuit elements of the first processing circuit, such as a conditioning chip, etc. The protective gel 253 may be exposed to the interior of the housing, or may be connected to the interior of the housing through a vent provided on a cover of the frame assembly 25, and the frame assembly 25 may also include a waterproof and 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] In order to facilitate the fixing of the circuit boards 21 and 22 inside the housing, several first support parts 14, preferably substantially columnar, can be provided inside the main housing 1. The first support parts 14 are preferably provided at the corners of the housing wall 15. For example, the cross section of the housing wall 15 can be rectangular, and the main body 11 protrudes toward one side of the housing wall 15 to form the first support parts 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 part 14 and can be fixed on the top surface 14a by bonding. The circuit board 22 can be positioned circumferentially by the inner wall of the housing wall 15, and preferably abuts against the inner wall of the housing wall 15 to the left to prevent the circuit board 22 from being pulled off from 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 protruded 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 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. The protrusion 15b is snapped into 71a outward. The inner side of the buckle 71 can form a guiding inclined surface 71b inclined outwardly, and correspondingly, the outer side of the protrusion 15b can form a guiding inclined surface (not marked) inclined inwardly. Among them, the corresponding side outer walls of the shell wall 15 can be recessed inwardly to form a second receiving groove 15a for accommodating the buckle 71 (see for details). Figure 6The middle parts of the corresponding two side outer walls of the shell wall 15 can be relatively convex inward to form a second support portion 151, and the top surface 151a of the second support portion 151 is relatively sunken but goes upward over the circuit board 22 to support the upper cover 7 upward. In particular, the corresponding two side edges of the circuit board 22 are concave inward to form positioning notches 22d matching the second support portion 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 make the overall arrangement more compact, the cable 8 and the second clearance portion 22a can be arranged at Figure 2 The second support portion 151 and the buckle 71 are arranged on the left and right sides of Figure 2 At the same time, the positioning protrusion 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 excessive thickness 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 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 also be covered on the connection between the flexible circuit board 26 and the circuit board 21.

[0048] In some other variant embodiments, the main body of the wire harness 81 may pass through a through hole provided on the left side wall of the shell wall 15 and pass out laterally. Figure 2 The cable 8 and the circuit board 22 shown in the figure can also be turned upside down. In this case, the main body of the harness 81 can pass outward from the through hole set on the left side wall of the shell wall 15, and the first longitudinal extension part 81a passes downward through the conductive hole 22b and is welded to the lower surface of the circuit board 21 to form a welding point, and the bent part 81c is located on the upper side of the circuit board 22. In this way, the effect of preventing the cable 8 from being pulled off can also be achieved; and, in addition, a fixing plug sleeved on the outside of each harness 81 can be fixed in the through hole to further improve the risk of preventing the cable 8 from 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 Figure 7-Figure 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 covering the opening 252f. The cover 251c is provided with a vent 251d for penetrating 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 schemes, the waterproof breathable membrane 254 may 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 parts 252b, and the first extension parts 252b can be more firmly and tightly bonded to the upper surface of the circuit board 21 through 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 parts 251b, and the second extension parts 251b can be tightly bonded to the upper surface of the first extension parts 252b through a second adhesive (not shown).

[0053] See also Fig. 9In the third embodiment, preferably, the upper end of the first frame 252 may form a third extension portion 252g extending substantially up and down. The third extension portion 252g is integrally connected to the body 252a of the first frame 252 through a circle of support portions 252c. The body 251a of the second frame 251 may extend up and down, the lower end of the body 251a may be supported against the middle of the support portion 252c, and the gap between the body 251a, the third extension portion 252g and the groove 252d is filled with the third adhesive 250, so that the body 251a of the first frame 251 may be sealed and bonded to the third extension portion 252g through the third adhesive 250. In some other schemes, the lower end of the body 251a of the first frame 251 may also extend outwardly with respect to the upper end, for example, it may be a cone-shaped cylinder with the cone top facing upward. The lower end of the body 251a can be supported against the outer edge of the support portion 252c, or tightly fit on the inner wall of the third extension portion 252g. Preferably, it is best to make the protective gel 253 lower than the upper edge of the body 252a, so that when the lower end of the body 251a is tightly fitted on the inner wall of the third extension portion 252g, the body 252a and the third extension portion 252g are integrally connected through the support portion 252c, so that the installation stress generated by the tight fit or threaded fit is transmitted to the protective gel 253 filled in the body 252a, which can reduce the measurement error caused by the transmission of the installation stress generated by the tight fit or threaded fit to the protective gel 253 filled in the body 252a.

[0054] Preferably, the support portion 252c may be recessed downward to form a circle of grooves 252d. The inner peripheral wall of the body 251a may be supported on the inner wall 252e of the groove 252d. A part or all of the third adhesive 250 is accommodated in the groove 252d. This can reduce the risk of the third adhesive 250 overflowing into the inner cavity of the first frame 251, and can further reduce the transmission of the installation stress to the body 252a.

[0055] See also Fig.10 In the fourth embodiment, the upper portion of the body 252a of the second frame 251 extends up and down, and can be tightly fitted or threadedly fitted to the inner wall of the third extension portion 252g. After the upper portion of the body 252a shrinks inward, a gap is formed between the body 252a and the third extension portion 252g for accommodating at least a portion of the third adhesive 250. The lower end of the body 251a of the second frame 251 is supported downward on the support portion 252c, specifically, can be supported on the bottom of the groove 252d.

[0056] In the above embodiments, the first frame 252 is preferably a metal part, and the first frame 252 can additionally form an electromagnetic shield for the pressure sensitive element 20 and the lead 24; preferably, the second frame 251 can also be a metal part, so that the first frame 252 can form an electrical contact by supporting the second frame 251, so that the frame assembly 25 can additionally form a complete electromagnetic shield for the pressure sensitive element 20 and the lead 24. In the first embodiment, the second frame 251 can be a metal part, and the first frame 252 can be a metal part or not, so that a complete electromagnetic shield can also be formed. The lower end of the body 251a of the second frame 251 can be tilted outward relative to the upper end, so that the additional pressure on the pressure sensitive element caused by the weight of the protective gel 253 itself and the pressure fluctuations that may be caused by vibration can be relatively reduced.

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

[0058] Preferably, in order to further ensure reliable electrical contact between the first frame 252 and the second frame 251, the third adhesive 250 may be a conductive adhesive. Similarly, the second adhesive may also be a conductive adhesive. More preferably, the first adhesive may also be a conductive adhesive, in which case the first frame 252 may be electrically connected to a ground terminal of the measurement circuit through the conductive adhesive.

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

[0060] A circuit board 21 is provided, on the upper side of which at least one pressure sensitive element 20 and a measuring circuit electrically connected to the pressure sensitive element 20 through a lead 24 are arranged, and at least one pressure through hole 21a is arranged on the circuit board 21 and passes through both sides of the circuit board 21. The pressure sensitive element 20 is correspondingly blocked on the upper side of the pressure through hole 21a;

[0061] Provide at least one first frame 252 having an opening 252f at the upper end, seal the lower end of the first frame 252 to the upper side of the circuit board 21 by a first adhesive, and surround the pressure sensitive element 20 inside 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, and a vent hole 251d is provided on the cover 251c for penetrating the upper and lower sides of the cover 251c;

[0065] The lower end of the second frame body 251 is sealedly connected to the first frame body 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, in order to protect the relatively fragile pressure chip and the leads for connecting to the measuring circuit, a frame is usually used to surround the pressure chip and the leads, and a protective gel is filled in the frame to protect them from mechanical and chemical adverse factors. When considering omitting the cover to simplify the structure of the above-mentioned pressure sensor, in order to simultaneously protect the pressure chip and the leads through the protective gel, such a difficulty is introduced, that is, the pressure chip and the leads still need to be isolated from the external moisture. If they are separated from the external environment by a frame with a vent, it is necessary to cover the vent with a waterproof breathable film. The protective gel needs to be vented under vacuum to discharge the bubbles in the gel. Since the viscosity of the gel is usually large, it is difficult to completely discharge the bubbles. When using such a frame, we found that due to the limitations of the allowable size of the sensor, the area of ​​the circuit board, and the edge bonding width of the waterproof breathable film, the available size of the vent is not enough to ensure smooth exhaust, resulting in sensor measurement errors or requiring several times of time to achieve complete exhaust.

[0068] Compared with the prior art, the pressure measurement component 2 manufactured by the above 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 the present application is not only applicable to the above-mentioned pressure sensor, but also to other types of sensors (such as temperature sensors, etc.) that measure other physical quantities, and further, to other electronic devices other than sensors. When the above-mentioned cable connection structure is applicable to other types of sensors, the above-mentioned pressure measurement component can be replaced by 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 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.

2. The cable connection structure according to claim 1, characterized in that: 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, characterized in that: The shell comprises 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 comprises a pressure measurement assembly, and the pressure measurement assembly comprises: 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 a first processing circuit connected to the pressure sensitive element via a lead is disposed; 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 arranged inside the main housing.

9. The pressure sensor according to claim 7, characterized in that: The 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.

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 the side of the pressure sensitive element away from the pressure introduction channel is communicated with the environment.

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