Pressure sensor

Abstract

The invention provides a pressure sensor. The pressure sensor comprises a housing which defines a mounting cavity and a pressure introduction channel; the pressure sensitive element is blocked at one end of the inner side of the pressure introduction channel; the supporting seat is fixed in the mounting cavity; the electronic module assembly is arranged in the mounting cavity, extends longitudinally and comprises a substrate which is fixed on the supporting seat and is electrically connected to the pressure sensitive element, the substrate extends in the left-right direction, a processing circuit is arranged on the surface of the front side of the substrate, and a plurality of metalized grooves are formed in the upper part of the substrate; and a plurality of conductive coil springs including a first spring segment wound about a first central axis, the first spring segment including an elastic portion having a plurality of coils sparsely arranged in a longitudinal direction; and a second spring segment including a plurality of coils wound around a second central axis and arranged in the longitudinal direction, wherein at least one coil of the second spring segment protrudes outward toward one side in the transverse direction to form a protruding portion. According to the conductive spiral spring disclosed by the invention, reliable electric contact between the conductive spiral spring and a circuit board can be easily realized in a lateral plugging manner.

Description

Technical Field

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

[0002] In hydraulic modules of automotive braking systems, the lateral dimensions of pressure sensors are limited by installation space, so their circuit boards are typically arranged vertically to provide sufficient area for electronic components. In these pressure sensors, the vertical circuit board must be electrically connected to the terminals. For example, this can be accomplished by connecting the vertical circuit board to the horizontal circuit board above via a flexible circuit board, which then forms an electrical connection between the horizontal circuit board and the terminals. For example, by vertically connecting the lower ends of spring terminals to electrical contacts on the horizontal circuit board, as shown in CN118090016A. Alternatively, additional electrical connectors may be provided to connect the vertical circuit board and the spring terminals, as shown in CN118090016A. This increases product complexity and costs. Alternatively, the outer wall of the spring terminal can be directly connected to the vertical circuit board through lateral contact, as shown in CN118624089A. However, the outer wall of the spring terminal is typically round, limiting the contact area with the vertical circuit board. This results in high contact resistance and the risk of disconnection under vibration.

[0003] The information disclosed in this Background of the Invention section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present application provides a pressure sensor, so that the terminal can easily form reliable and large-area electrical contact with the circuit board.

[0005] The present invention provides a pressure sensor, comprising:

[0006] A housing enclosing a mounting cavity and a pressure introduction passage;

[0007] a pressure sensitive element sealed at one inner end of the pressure introduction channel;

[0008] a support seat fixed in the mounting cavity;

[0009] An electronic module assembly disposed in the mounting cavity and extending longitudinally includes a substrate fixed to the support base and electrically connected to the pressure sensitive element, the substrate extending in the left-right direction and having a processing circuit disposed on the front surface thereof, and a plurality of metallized grooves disposed on an upper portion of the substrate;

[0010] and a plurality of conductive coil springs, comprising a first spring section wound about a first central axis, the first spring section comprising a plurality of coils sparsely arranged in a longitudinal direction and having an elastic portion; and a second spring section comprising a plurality of coils wound about a second central axis and arranged in a longitudinal direction, the second spring section comprising at least one coil protruding laterally outward to form a protrusion;

[0011] At least a portion of the first spring segment is retained on the outer shell; at least a portion of the second spring segment is retained in a first retaining hole formed on the support seat, and the protrusion is correspondingly inserted into the metallized groove and electrically contacts the inner wall of the metallized groove.

[0012] Preferably, the protrusion includes two arms connected to each other at one outer end to form an arched top, and the outer side of at least one of the two arms is in electrical contact with the inner walls of the left and right corresponding sides of the metallized groove.

[0013] Preferably, a gap is left between the two arms to allow them to deform toward one side or the other.

[0014] Preferably, the support seat has a forward positioning surface; the substrate is fixed to the positioning surface backward, and the protrusions of the conductive coil spring are inserted forward into the corresponding metallized grooves.

[0015] Preferably, the first retaining hole is connected to the positioning surface through a connecting notch, and the corresponding protrusion of the conductive coil spring protrudes forward from the positioning surface through the connecting notch.

[0016] Preferably, the pressure sensitive element is an inverted cup-shaped element, and the outer surface of the cup wall of the pressure sensitive element is provided with a flat mounting surface for mounting a pressure measurement circuit, and the mounting surface is substantially flush with the front surface of the substrate.

[0017] Preferably, the housing includes a cylindrical shell, a pressure interface fixed to the longitudinal distal end of the cylindrical shell, and a terminal button connected to the longitudinal proximal end of the pressure interface.

[0018] Preferably, at least a portion of the first spring segment is accommodated in a second retaining hole formed on the terminal button.

[0019] Preferably, the first central axis and the second central axis are offset in the transverse direction; the longitudinal distal end of the portion and the longitudinal proximal end of the second spring segment are integrally connected via a connecting portion extending substantially transversely.

[0020] Preferably, a surface of the longitudinal distal end of the terminal button is provided with a retaining groove for accommodating and positioning the connecting portion.

[0021] The pressure sensor of the present invention can be easily connected to the circuit board in a sideways plugging manner through a specially made spring terminal, thereby achieving reliable electrical contact, while having a relatively simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. 4 is a cross-sectional view of the pressure sensor according to the first embodiment.

[0023] Figure 2 FIG. 1 is a bottom view of a partial structure of the pressure sensor according to the first embodiment.

[0024] Figure 3 FIG. 1 is a front view of a partial structure of the pressure sensor according to the first embodiment.

[0025] Figure 4 FIG. 1 is a top view of a partial structure of the pressure sensor according to the first embodiment.

[0026] Figure 5 FIG. 4 is a perspective view of a conductive coil spring of the pressure sensor according to the first embodiment.

[0027] Figure 6 FIG. 4 is a perspective view of another conductive coil spring of the pressure sensor of the first embodiment.

[0028] Figure 7 FIG. 4 is a cross-sectional view of a support base of a pressure sensor according to a second embodiment.

[0029] Figure 8 FIG. 4 is a perspective view of a support base of a pressure sensor according to a second embodiment.

[0030] Figure 9 FIG. 4 is a cross-sectional view of a support base of a pressure sensor according to a third embodiment.

[0031] Figure 10 FIG. 4 is a perspective view of a support base of a pressure sensor according to a third embodiment.

[0032] Figure 11 FIG. 1 is a bottom view of a partial structure of a pressure sensor according to a third embodiment. DETAILED DESCRIPTION

[0033] 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.

[0034] In the description of this application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is conventionally placed when in use, or 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 element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the prepositive terms "first", "second", "third", etc. are only used to distinguish the modified objects, and cannot be understood as indicating or implying relative importance.

[0035] 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.

[0036] 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.

[0037] like Figures 1 to 6 As shown. Figure 1 In FIG, the pressure sensor 100 is cut along a plane perpendicular to the left and right directions; Figure 2 In FIG, only the conductive coil spring 5a, the conductive coil spring 5b, the substrate 41 and the terminal 13 are shown, wherein the substrate 41 is cut away by a transverse plane; Figure 3 In the embodiment, the cylindrical shell 12 and the seat body 33 are omitted; Figure 4 In FIG, only the clamping leg 32 and the disc body 114 are shown, and the clamping leg 32 is cut away.

[0038] In an embodiment, the pressure sensor 100 includes a housing 1 forming a mounting cavity (not marked) and an electronic module assembly 4 and a pressure sensitive element 2 arranged in the mounting cavity. The housing 1 may include a pressure interface 11 with a pressure introduction channel 120 formed therein. The outer end of the pressure introduction channel 120 extends through the outer end of a pressure interface tube 112 formed on the pressure interface 11 to receive the pressure medium to be measured, and the inner end thereof is blocked by the pressure sensitive element 2. The pressure sensitive element 2 receives the pressure medium to be measured, and converts the pressure of the pressure medium to be measured into an electrical signal through a pressure measurement circuit 23, and transmits the above-mentioned electrical signal to the electronic module assembly 4 for processing. Among them, the electronic module assembly 4 includes at least a substrate 41 arranged in the longitudinal direction (i.e., the up and down direction). The substrate 41 extends in the left and right direction and a processing circuit 42 is provided on the front surface. The processing circuit 42 can be electrically connected to the pressure measurement circuit 23 of the pressure sensitive element 2 through an electrical connector 43. The pressure sensor 100 also includes a support base 3 for fixing the substrate 41, which includes at least a main body (not marked) and a plurality of legs 32 extending downward from the lower edge of the main body of the support base 3. The lower end of the legs 32 protrudes inward to form a snap-fitting portion 323 that can be snapped into the snap-fitting groove 11b formed on the pressure interface 11. The main body of the support base 3 includes at least a seat body 31, and the seat body 31 can have a forward positioning surface 31a. The substrate 41 is facing backward (such as Figure 2 The base plate 41 is fixed to the positioning surface 31a by an adhesive. Additionally or alternatively, the base plate 41 can be fixed to the positioning surface 31a by a plurality of rivet portions 31b extending forward from the seat body 31, or the seat body 31 can be formed with a plurality of clips 312 for clipping and fixing the base plate 41 to the base plate 41. The clips 312 are preferably provided on the left and right sides of the positioning surface 31a. The edge of the positioning surface 31a can extend forward to form a surrounding wall for limiting the position of the base plate 41. In order to make the base plate 41 as wide as possible, the base plate 41, especially the front surface, can be configured to be as close as possible to the central axis of the housing 1, in particular the central axis of the cylindrical shell 12 (described in detail below).

[0039] In this embodiment, after the processing circuit 42 processes the above-mentioned electrical signal, it is transmitted to the outside of the pressure sensor 100 through two conductive coil springs 5a and two conductive coil springs 5b. Among them, the conductive coil spring 5a and the conductive coil spring 5b both include a spring segment 51 wound around the central axis P1, and a spring segment 52 including multiple coils wound around the central axis P2 and arranged in the longitudinal direction. At least one coil of the spring segment 52 protrudes outward in a lateral direction to form a protrusion 521. The spring segment 51 preferably includes an elastic portion 512 having multiple coils sparsely arranged in the longitudinal direction, so that it can provide a certain longitudinal elasticity when it is longitudinally plugged into an external device. In some other embodiments, the coils of the spring segment 52 can also be closely arranged in the longitudinal direction.

[0040] The conductive coil springs 5a and 5b can be arranged at the four corners of a rectangle in a transverse plane. The upper portion of the substrate 41 is provided with four spaced-apart metallized grooves 41a corresponding one to each of the four conductive coil springs. The metallized grooves 41a are part of the processing circuit 42 or are electrically connected to the processing circuit 42. The two conductive coil springs 5a are located on the front side of the substrate 41, and their protrusions 521 are respectively inserted forward into the corresponding metallized grooves 41a; the two conductive coil springs 5b are located on the rear side of the substrate 41, and their protrusions 521 are respectively inserted forward into the corresponding metallized grooves 41a. The outer side of the protrusion 521 is electrically in contact with at least one of the front and rear side walls of the metallized groove 41a. The metallized groove 41a can be made into a metal layer on the inner wall of the groove that passes through it by a process such as copper plating.

[0041] The protrusion 521 may include two arms 5211 connected at one end to form an arched top 5210. The outer side of at least one of the two arms 5211 is electrically contacted with the inner wall of the corresponding left and right sides of the metallized groove 41a. Preferably, the outer side of the protrusion 521 can be inserted into the metallized groove 41a with a tight fit. A gap 5213 can be further left between the two arms 5211 to allow them to deform toward the left and right sides. In this way, when the protrusion 521 is inserted into the metallized groove 41a, the gap 5213 allows the arms 5211 to be squeezed and deformed by the inner wall of the metallized groove 41a, thereby forming an elastic electrical contact with the inner wall of the metallized groove 41a.

[0042] The housing 1 may further include a terminal button 13 disposed on a longitudinally proximal side (i.e., an upper side) of the pressure interface 11. At least a portion of the spring segment 51 is retained in a retaining hole 131 formed in the terminal button 13, and at least a portion of the spring segment 52 is retained in a retaining hole 31d formed in the support base 3.

[0043] Please refer to Figure 5 、 Figure 6Preferably, the central axis P1 and the central axis P2 are offset in the transverse direction, and the longitudinal distal end of the portion 512 and the longitudinal proximal end of the spring segment 52 are integrally connected by a connecting portion 53 that extends substantially transversely. The presence of the transition portion 513 can prevent the conductive coil springs 5a and 5b from escaping upward from the retaining hole 131. This allows the spring segments 51 of the conductive coil springs 5a and 5b to be arranged in a desired manner, while also ensuring that their spring segments 52 and protrusions 521 are arranged substantially evenly spaced on the rear side of the substrate 41 in the left-right direction of the substrate 41. Specifically, for the conductive coil spring 5b, since its spring segments 51 and 52 are located on the front and rear sides of the substrate 41, respectively, the connecting portion 53 can extend from the upper side of the substrate 41 across the front and rear sides of the substrate 41 to connect the spring segments 51 and 52. In some other solutions, alternatively, the center axis P1 and the center axis P2 can also be coaxially arranged, so that the electric coil springs 5a and 5b are generally located on the rear side of the substrate 41, and their spring segments 51 are arranged at intervals in the left-right direction on the rear side of the substrate 41.

[0044] Preferably, the spring segment 51 includes a portion 511 formed into a plurality of coils wound around a central axis P1. Portion 511 is connected to the longitudinal proximal end of portion 512, distal from the spring segment 52. The coils of portion 511 are preferably closely spaced longitudinally to provide a certain degree of rigidity when the spring segment 51 is longitudinally plugged into an external device. Preferably, the outer diameter of portion 511 is smaller than that of portion 512, and portions 512 and 511 are connected by a transition portion 513. Accordingly, the retaining hole 131 may be a stepped hole, with the diameter of the upper portion of the retaining hole 131 being smaller than that of the lower portion. The upper and lower portions of the retaining hole 131 are connected by a generally conical transition surface, which presses downward against the transition portion 513 to provide additional retention force to prevent the conductive coil springs 5a and 5b from dislodging upward. The transition portion 513 may be closely spaced longitudinally to provide a certain degree of rigidity. Preferably, the longitudinal proximal end of portion 511 can be formed into a flat contact surface, thereby maintaining a sufficient contact area when electrically contacting an external device in the longitudinal direction. The longitudinal proximal end of portion 511 forms a tapered head 514, which allows the coils to be closely arranged in the longitudinal direction. The conductive coil springs 5a and 5b are preferably integrally formed from a single metal wire.

[0045] Preferably, the distal end of the spring segment 52 forms a tapered head 522 with coils closely arranged in the longitudinal direction. The protrusions 521 of the conductive coil spring 5a are all inserted forward into the corresponding metallized slots 41a.

[0046] Preferably, according to the pressure sensor 100 of claim 4, the retaining hole 31d is connected to the positioning surface 31a through a connecting notch 31e, and the corresponding protrusion 521 of the conductive coil spring 5a protrudes forward from the positioning surface 31a through the connecting notch.

[0047] For example, the pressure sensitive element 2 can be an inverted cup-shaped element. The outer surface of the cup wall 22 of the pressure sensitive element 2 is provided with a flat mounting surface 22a for mounting the pressure measurement circuit 23. The inner wall opposite the mounting surface 22a is also flat, thereby forming a vertical elastic diaphragm on the cup wall 22. The cup-shaped element is preferably made of a metal material. The pressure measurement circuit 23 can be a piezoresistive measurement circuit, which can include two strain gauges 231, such as silicon strain gauges, each with two piezoresistors. These four piezoresistors form a Wheatstone bridge circuit that generates an electrical signal in response to the pressure of the pressure medium to be measured within the pressure chamber 20 formed by the inner side of the cup wall 22. Since the pressure measurement circuit 23 is disposed on the mounting surface 22a, it can be easily electrically connected to the pads 41b disposed on the lower portion of the front surface of the substrate 41 via electrical connectors 43 (particularly bonding wires). Preferably, the mounting surface 22a is substantially flush with the mounting surface 231 and the front surface of the substrate 41. In an alternative embodiment, the pressure measurement circuit 23 may also be arranged on the side surface of the cup bottom 21 of the pressure sensitive element 2 facing the substrate 41. In this way, although the pressure measurement circuit 23 is perpendicular to the pad 41b, it can be welded to the pad 41b through a flexible or other flexible electrical connector board.

[0048] The housing 1 may further include a cylindrical shell 12 to longitudinally connect the pressure port 11 and the terminal button 13. For example, the pressure port 11 may be fixed to the longitudinal distal end (i.e., the lower end) of the cylindrical shell 12. The upper end of the cylindrical shell 12 may be rolled inward to form a crimping portion 12a, which presses downward against an upwardly facing stepped surface 13a formed on the outer wall of the terminal button 13. The lower end of the terminal button 13 is supported by the upper end of the support seat 3. Thus, the crimping portion 12a downwardly presses the terminal button 13 and the support seat 3 to the upper end of the pressure port 11. Preferably, the lower edge of the terminal button 13 may be recessed upward to form at least one circumferential positioning recess 13b. Correspondingly, the upper end of the support seat 3 may be protruding upward to form at least one circumferential positioning protrusion 315. The circumferential positioning protrusion 315 is inserted upward into the circumferential positioning recess 13b to achieve circumferential positioning between the terminal button 13 and the support seat 3. A sealing body 123 may be provided between the crimping portion 12 a and the stepped surface 13 a .

[0049] The longitudinal distal end of the terminal button 13 may be provided with a retaining groove 132 for accommodating and positioning the connecting portion 53. Thus, when assembling the pressure sensor 100, the terminal button 13 may be inverted, and the spring segments 51 of the conductive coil springs 5a and 5b may be invertedly inserted into the retaining hole 131 of the terminal button 13, while simultaneously placing the connecting portions 53 of the conductive coil springs 5a and 5b into the corresponding retaining grooves 132. The support base 3 is then inverted and circumferentially positioned and connected to the terminal button 13, such that the spring segments 52 of the conductive coil springs 5a and 5b are retained within the retaining hole 31d on the support base 3. Preferably, the circumferential positioning protrusion 315 and the circumferential positioning recess 13b may be engaged by a snap-fit structure, so that the conductive coil springs 5a and 5b, the terminal button 13, and the support base 3 can be securely assembled.

[0050] Preferably, the main body of the support base 3, in addition to the aforementioned base body 31, may also include another base body 33 secured to the base body 31 from the front. After the substrate 41 is secured to the positioning surface 31a and the pads 41b and pressure measurement circuit 23 are electrically connected via the electrical connector 43, the base body 33 can be secured to the base body 31. This allows the upper end of the support base 3 to substantially form a circle after the base bodies 31 and 33 are assembled, thereby providing reliable support for the terminal button 13 via the upper end surface of the support base 3. The upper end surface of the support base 3 may include a recessed cavity 31c for accommodating at least a portion of the connecting portion 53. A cavity 314 for accommodating the avoidance processing circuit 42 is provided between the base body 33 and the positioning surface 31a of the base body 31.

[0051] For example, the upper end of the pressure interface 11 may extend upward to form a boss 11e, and the aforementioned snap-fitting groove 11b may be formed at the bottom of the outer wall of the boss 11e. The inner end of the pressure introduction channel 120 may extend upward through the boss 11e and continue to extend upward to form a vertical tube body 113. The outer wall of the terminal button 13 may extend outward laterally to form a disc body 114. A circumferential positioning groove 114a may be formed on the periphery of the disc body 114. A longitudinally extending positioning ridge 323 may be formed on the inner wall of the clamping leg 32, which is positioned and matched within the aforementioned circumferential positioning groove 114a. The pressure interface 11 may be formed with a circle of stepped surfaces 11d for supporting the clamping leg 32, as well as a circle of stepped surfaces 11c for supporting the connection to the lower end of the cylindrical shell 12. A stress isolation groove 11a is formed on the outer wall of the tube body 113, located between the root of the tube body 113 and the lower side of the disc body 114.

[0052] In this embodiment, the clamping legs 32 can be connected as a whole in the circumferential direction, and the circumferential extension angle α of their lower ends can be greater than half a circle; or, there are multiple clamping legs, which are separated by several circumferential notches 32a in the circumferential direction, and the circumferential extension angles of the circumferential notches 32a are all less than half a circle to prevent the clamping legs 32 from laterally escaping from the snap-fit groove 11b.

[0053] See also Figure 7 、 Figure 8 The pressure sensor 100 of the second embodiment can connect the seat body 33 and the seat body 31 as a whole compared to the first embodiment. In order to prevent the seat body 33 from blocking the substrate 41 from being installed to the positioning surface 31a in the rear direction, it can be replaced by the left and right sides (i.e., along the width direction of the substrate 41, for example, Figure 8 The substrate 41 is inserted into the slot 313 formed in the support base 3 (from the left side indicated by the arrow in the middle). When the substrate 41 is inserted leftward into the slot 313, due to the interference between the front and rear surfaces of the substrate 41 and the protrusion 521, the substrate 41 presses the protrusion 521 leftward, causing the spring segment 52 to deform circumferentially. The protrusion 521 finally aligns with the corresponding metallized slot 41a in the left-right direction, at which point the protrusion 521 rebounds into the corresponding metallized slot 41a. During this process, the left sidewall of the metallized slot 41a can be expanded outward to prevent the protrusion 521 from rebounding into the corresponding metallized slot 41a. The slot 313 has a right opening to allow the substrate 41 to be inserted leftward into the slot 313. The first positioning surface 31a of the base body 31 and the positioning surface 33a of the base body 33, which is opposite to the positioning surface 31a in the front and rear directions, define the front and rear inner walls of the slot 313. The support base 3 can be formed with a stop surface 3a for stopping the substrate 41 to the right. The base plate 41 can be fixed in the slot 313 by one or more of tight fit, bonding or snap connection. A support portion 316 can be formed on the support base 3 for supporting the longitudinal distal end of the base plate 41 upward.

[0054] In order to facilitate the connection of the pad 41b and the pressure measurement circuit 23 through the electrical connector 43, a clearance portion for avoiding operation can be provided on one side of the support seat 3. For example, the upper edge of a circumferential notch 32a located on the front side of the substrate 41 can be raised to the upper side of the pad 41b, so that the pad 41b is exposed horizontally or the support seat 3 avoids the pad 41b in the radial direction.

[0055] Preferably, a guide portion 31f is provided on the right opening of the slot 313, which forms a guide slope that gradually decreases the width of the slot 313 from right to left. To accommodate the electronic components of the processing circuit 42, the positioning surface 33a of the seat body 33 can be recessed to form an accommodating cavity 314 for accommodating the processing circuit 42.

[0056] See also Figures 9 to 11Compared to the second embodiment, the pressure sensor 100 of the third embodiment can be configured to more conveniently assemble the substrate 41 to the support base 3 by arranging one arm 5211 of the protrusion 521 perpendicular to the substrate 41 and electrically contacting the inner wall of 41a on its outer side. The end of the other arm 5211, which is away from the arched top 5210, is tilted toward the left or right insertion side of the substrate 41. Although this reduces or eliminates the contact area between the other arm 5211 and the inner wall of the corresponding side of the metallized groove 41a, it allows the protrusion 521 to more easily rebound into the corresponding metallized groove 41a. The gap 5213 between the two arms 5211, which allows them to deform toward the left or right, is roughly in the shape of a right triangle. In addition, the protrusion 521 of the conductive coil spring 5a is inserted rearward into the corresponding metallized groove 41a, while the protrusion 521 of the conductive coil spring 5b is inserted forward into the corresponding metallized groove 41a. In this case, two retaining holes 31d are provided in the seat body 31, and the other two retaining holes 31d are provided in the seat body 33. The connecting portions 53 of the conductive coil springs 5a and 5b do not span the front and rear sides of the substrate 41. This allows only two conductive spring terminals of the same structure to be used when the central axis of the substrate 41 and the cylindrical shell 12 coincide, thereby improving the uniformity of the parts.

[0057] 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 pressure sensor (100), characterized in that: include: A housing (1) enclosing a mounting cavity and a pressure introduction channel (120); a pressure sensitive element (2) sealed at one inner end of the pressure introduction channel (120); A support seat (3) fixed in the installation cavity; An electronic module assembly (4) disposed in the mounting cavity and extending longitudinally includes a substrate (41) fixed to the support seat (3) and electrically connected to the pressure sensitive element (2), the substrate (41) extending in the left-right direction and having a processing circuit (42) disposed on the front surface, and a plurality of metallized grooves (41a) disposed on the upper portion of the substrate (41); and a plurality of conductive coil springs (5a, 5b), comprising a first spring section (51) wound around a first central axis (P1), comprising an elastic portion (512) having a plurality of coils sparsely arranged in the longitudinal direction; and a second spring section (52) wound around a second central axis (P2) comprising a plurality of coils arranged in the longitudinal direction, at least one coil of the second spring section protruding outward in a lateral direction to form a protrusion (521); At least a portion of the first spring segment (51) is retained on the housing (1); at least a portion of the second spring segment (52) is retained in a first retaining hole (31d) formed on the support seat (3), and the protrusion (521) thereof is correspondingly inserted into the metallized groove (41a) and electrically contacts the inner wall of the metallized groove (41a).

2. The pressure sensor (100) according to claim 1, characterized in that The protrusion (521) comprises two arms (5211) whose outer ends are connected to each other to form an arched top (5210), and the outer side of at least one of the two arms (5211) is electrically contacted with the inner walls of the corresponding left and right sides of the metallized groove (41a).

3. The pressure sensor (100) according to claim 2, characterized in that A gap (5213) is left between the two arms (5211) to allow them to deform toward one side or the other.

4. The pressure sensor (100) according to claim 1, characterized in that The support seat (3) has a forward positioning surface (31a); the base plate (41) is fixed to the positioning surface (31a) backward, and the protrusions (521) of the conductive coil springs (5a, 5b) are inserted forward into the corresponding metallized grooves (41a).

5. The pressure sensor (100) according to claim 4, characterized in that The first retaining hole (31d) is connected to the positioning surface (31a) through a connecting notch, and the corresponding protrusion (521) of the conductive coil spring (5a, 5b) protrudes forward from the positioning surface (31a) through the connecting notch.

6. The pressure sensor (100) according to claim 1, characterized in that The pressure sensitive element (2) is an inverted cup-shaped element, and the outer surface of the cup wall (22) of the pressure sensitive element (2) is provided with a flat mounting surface (22a) for mounting a pressure measurement circuit (23), and the mounting surface (22a) is substantially flush with the front surface of the substrate (41).

7. The pressure sensor (100) according to any one of claims 1 to 6, characterized in that The housing (1) comprises a cylindrical shell (12), a pressure interface (11) fixed to the longitudinal distal end of the cylindrical shell (12), and a terminal button (13) connected to the longitudinal proximal end of the pressure interface (11).

8. The pressure sensor (100) according to claim 7, characterized in that At least a portion of the first spring section (51) is accommodated in a second retaining hole (131) formed on the terminal button (13).

9. The pressure sensor (100) according to claim 7, characterized in that The first central axis (P1) and the second central axis (P2) are offset in the transverse direction; the longitudinal distal end of the portion (512) and the longitudinal proximal end of the second spring segment (52) are integrally connected via a connecting portion (53) extending substantially transversely.

10. The pressure sensor (100) according to claim 9, characterized in that The surface of the longitudinal distal end of the terminal button (13) is provided with a retaining groove (132) for accommodating and positioning the connecting portion (53).

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