A pressure sensor

Abstract

A pressure sensor includes a housing including a pressure port of metal fixed to a lower end of a cylindrical housing, a pressure introduction passage provided on the pressure port, a pressure sensitive element, a support seat including a main body portion and a fixed portion fixed to a lower end of the main body portion and fixed to the pressure port, a first pressing edge formed at an upper end of the cylindrical housing to press a lower end of an electrical connector to the main body portion, a first clearance hole provided on the main body portion to surround at least a portion of the pressure sensitive element, a first substrate having a first signal processing circuit provided on an upper surface thereof, a second substrate having a second signal processing circuit provided on an upper surface thereof, a compressed conductive coil spring held in a first holding hole provided on the main body portion, a lower end of the compressed conductive coil spring being electrically connected to the second signal processing circuit and an upper end of the compressed conductive coil spring being electrically connected to a second electrical contact portion provided on the second substrate, and a terminal provided on the electrical connector. The pressure sensor has high space utilization and is easy to assemble.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensor, in particular to a pressure sensor. BACKGROUND

[0002] In the ESC system (Electronic Stability Control) of automobile, pressure sensor is needed to measure the pressure of brake medium, which is usually arranged on the hydraulic module with limited installation space, so it is required to have small size, especially the lateral size. Usually, the circuit board is arranged laterally, so the area for mounting electronic components is small, and then multiple circuit boards arranged vertically or the circuit board arranged vertically is needed. No matter which arrangement, the electrical connection between these components and terminals is usually inconvenient and high cost. For example, when the circuit board is arranged vertically, the wire bonding planes of the circuit board and the pressure sensitive element are perpendicular to each other, which is extremely inconvenient from the equipment or control; when multiple circuit boards arranged vertically are arranged, the fixation and electrical connection between these circuit boards also increase the cost and process complexity.

[0003] On the other hand, the pressure sensor usually uses a metal elastic diaphragm as a pressure deformation body, and a Wheatstone bridge composed of thick film resistors or silicon strain gauges is attached to the surface of the side of the metal elastic diaphragm away from the measured pressure medium to convert the strain of the metal elastic diaphragm into an electrical signal. These thick film resistors or silicon strain gauges need to be connected to the circuit board through leads. These leads and resistors are preferably protected by gel. Therefore, it is usually necessary to fix a frame capable of accommodating gel on the side of the circuit board away from the metal elastic diaphragm. SUMMARY

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

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a pressure sensor, comprising:

[0006] A housing comprising a metal cylinder extending longitudinally, a metal pressure port fixed to the lower end of the cylinder, and an electrical connector extending into the cylinder at the lower end; a pressure introduction channel is arranged on the pressure port;

[0007] A pressure sensitive element fixed to one end of the inside of the pressure introduction channel;

[0008] The support seat comprises a main body, a fixed part fixed to the lower end of the main body and fixed to the pressure interface; the upper end of the cylinder shell forms a first pressing edge for pressing the lower end of the electrical connector to the main body; the main body is provided with a first clearance hole around at least part of the pressure sensitive element;

[0009] A first substrate fixed to the upper surface of the main body, the lower side surface of which is close to the pressure sensitive element and leaves a gap between the pressure sensitive element, the upper side surface of which is provided with a first signal processing circuit electrically connected to the pressure sensitive element through a lead, and a via hole allowing the lead to pass through up and down;

[0010] A second substrate provided with a second clearance hole on the radial inner side of the fixed part and allowing the pressure sensitive element to pass through, the upper side surface of which is provided with a second signal processing circuit;

[0011] A compressed conductive coil spring held in the first holding hole provided on the main body, the lower end of which is electrically connected to the second signal processing circuit, and the upper end of which is electrically connected to the first electrical contact provided on the lower side surface of the substrate and electrically connected to the first signal processing circuit;

[0012] And a terminal provided on the electrical connector, which is electrically connected to the first substrate.

[0013] Preferably, it further comprises a pressing seat fixed to the first substrate; the terminal is a spring terminal; the pressing seat is provided with a first holding hole for holding the lower part of the spring terminal; the electrical connector is provided with a third holding hole for holding the upper part of the spring terminal.

[0014] Preferably, the pressing seat comprises a pressing seat body forming the first holding hole and a first surrounding wall formed by the edge of the pressing seat body extending downward and adhering to the edge of the upper side surface of the first substrate.

[0015] Preferably, the pressing seat comprises a pressing seat body forming the first holding hole and a first surrounding wall formed by the edge of the pressing seat body extending downward and abutting against the edge of the upper side surface of the first substrate; the support seat further comprises a pressing part molded in the main body at the lower end, the upper end of the pressing part is bent inward to form a second pressing edge for pressing the pressing seat downward.

[0016] Preferably, the pressure seat comprises a pressure seat body forming the first holding hole, a first surrounding wall formed by edges of the pressure seat body extending downward to abut against edges of the upper side surface of the first substrate, and a ring of second surrounding walls formed by the pressure seat body extending downward; the second surrounding walls abut against or abut against the upper side surface of the first substrate and form a cavity with the first substrate surrounding the upper end of the via; the first surrounding wall, the second surrounding wall and the first substrate form a cavity, and the first signal processing circuit comprises a second electrical contact located in the cavity and in electrical contact with the lower end of the spring terminal.

[0017] Preferably, the cavity is filled with a gel covering the lead.

[0018] Preferably, a side surface of the pressure sensitive element away from the pressure introduction channel is provided with a pressure sensing circuit electrically connected to the first signal processing circuit through the lead, and the gel partially fills the gap to cover the pressure sensing circuit.

[0019] Preferably, the lower end of the second surrounding wall elastically abuts against the first substrate.

[0020] Preferably, the pressure seat further comprises at least one ring of thin shell-shaped connecting parts connected to the upper end of the second surrounding wall and the pressure seat body respectively.

[0021] Preferably, the fixing part comprises a plurality of parts made of metal material arranged in a circumferential gap, and the fixing part protrudes inwardly to form a anti-extrusion part for preventing the second substrate from being extruded downward.

[0022] The pressure sensor described above, by arranging two substrates with circuits arranged thereon in an up-down arrangement, and using the space around the connecting flange of the lower substrate, increases the arrangement area of electronic components while saving space in the housing; at the same time, the circuits on the two substrates can be conveniently electrically connected through the conductive coil spring. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Structure diagram of the pressure sensor of the first embodiment;

[0024] Figure 2 Structure diagram of the pressure sensor of the second embodiment;

[0025] Figure 3 Structure diagram of the pressure sensor of the third embodiment;

[0026] Explanation of reference signs: 100, pressure introduction channel; 111, support disc; 11a, groove; 11, connecting flange; 1a, step surface; 1b, step surface; 1c, flange part; 1d, upper end surface; 1f, lower end surface; 1, pressure interface; 200, pressure sensing circuit; 201, gap; 20, metal elastic diaphragm; 21, support wall; 22, enlarged part; 2, pressure sensitive element; 311, pressing edge; 31, pressing part; 321, anti-dropping part; 32, fixing part; 33a, clearance hole; 33b, retaining hole; 33, main body part; 3, support seat; 400, gel; 411, electrical contact part; 412, electrical contact part; 41a, via hole; 41, substrate; 42a, clearance hole; 42, substrate; 431, electronic element; 43, signal processing circuit; 44, electrical connector; 451, electrical contact part; 45, signal processing circuit; 4, electronic module assembly; 501, waterproof and breathable membrane; 511, extension part; 51a, retaining hole; 51, pressing seat main body; 52, enclosing wall; 531, connecting part; 53, enclosing wall; 5a, cavity; 5b, cavity; 5c, step surface; 5d, hole; 5, pressing seat; 61, pressing edge; 6, barrel shell; 71, support flange; 7a, step surface; 7b, retaining hole; 7, electrical connector; 8, spring terminal; 91, sealing ring; 92, sealing ring. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. The following examples are exemplary and are only used to explain the present application, and cannot be interpreted as a limitation on the present application. In the following description, the same reference signs are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0028] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the prepositions "first", "second", "third", etc. are only used for the purpose of distinguishing the objects being modified, and cannot be understood as indicating or implying relative importance.

[0029] Furthermore, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] It should also be further understood that the term "and / or" as used in this application specification and the corresponding claims refers to any combination of one or more of the listed items and all possible combinations.

[0031] like Figure 1 As shown. The pressure sensor of the first embodiment includes a housing composed of a pressure interface 1, a cylindrical shell 6, and an electrical connector 7. Both the cylindrical shell 6 and the pressure interface 1 are made of metal. A portion of the electrical connector 7 extends downward into the interior of the cylindrical shell 6. The cylindrical shell 6 extends longitudinally (i.e., vertically in the figure), and its lower end can be welded to a stepped surface 1a formed on the pressure interface 1. Its upper end is bent inward to form a pressing edge 61 to press downward against the stepped surface 7a formed on the electrical connector 7. Preferably, a sealing ring 92 can be provided between the pressing edge 61 and the stepped surface 7a, and / or a sealant can be applied between the pressing edge 61 and the outer wall of the electrical connector 7.

[0032] A pressure inlet channel 100 is formed within the pressure interface 1. One end of the pressure inlet channel 100 is sealed and coupled to a pressure-sensitive element 2. The pressure-sensitive element 2 generates a corresponding electrical signal in response to the pressure of the medium to be measured within the pressure inlet channel 100. The pressure sensor also includes an electronic module assembly 4 disposed inside the housing to process the aforementioned electrical signal. The electrical connector 7 is provided with terminals electrically connected to the electronic module assembly 4.

[0033] The electronic module assembly 4 may include a support base 3 fixed inside the housing. The upper end of the support base 3 is supported on a portion of the electrical connector 7 extending into the cylindrical shell 6, and its lower end is fixed to a stepped surface 1b formed on the pressure port 1. For example, the support base 3 includes a main body 33 and a metal fixing part 32 molded into the upper end of the support base 3. The fixing part 32 may be thin-shell shaped, and may extend continuously in the circumferential direction to form a complete circle, or may be divided into multiple parts arranged at intervals in the circumferential direction. When the fixing part 32 forms a complete circle, its lower end may be welded to the stepped surface 1b; when the fixing part 32 is divided into multiple parts arranged at intervals in the circumferential direction, the fixing part 32 may be snapped onto the outer wall of the flange part 1c formed by the corresponding upward protrusion from the inner side of the stepped surface 1b.

[0034] The pressure sensitive element 2 can be exemplarily composed of a metal elastic diaphragm 20 with its upper surface laterally extending, and a peripheral edge of the diaphragm 20 downwardly extending to form a supporting wall 21, and a lower end of the supporting wall 21 being sealingly connected to an inner end of the pressure introduction channel 100. For example, the inner end of the pressure introduction channel 100 can have a connecting flange 11 formed on an upper end surface 1d of the pressure connector 1, and an outer wall of the connecting flange 11 can extend outwardly to form a supporting disc 111, and the lower end of the supporting wall 21 can be supported on and welded to an upper surface of the supporting disc 111. Preferably, the supporting disc 111 is arranged at a longitudinal middle portion of the connecting flange 11, so that a groove 11a is formed between the supporting disc 111 and a root of the connecting flange 11, and the groove 11a is inwardly and radially concave, so as to isolate the metal elastic diaphragm 20 from the stress of the pressure connector 1 during installation. The upper surface of the metal elastic diaphragm 20 is insulated and provided with a pressure sensing circuit 200 composed of a thick film resistor or a semiconductor strain gauge or other types of strain resistance.

[0035] In other embodiments, the pressure sensitive element 2 can also be composed of an elastic diaphragm made of ceramic or other suitable materials, and the upper surface of the elastic diaphragm is insulated and provided with a pressure sensing circuit 200 composed of a thick film resistor or a semiconductor strain gauge or other types of strain resistance. The elastic diaphragm can be sealingly fixed to the inner end of the pressure introduction channel 100 by pressure sealing or adhesive sealing.

[0036] The electronic module assembly 4 can include a base plate 41 and a base plate 42 arranged in a vertical direction and laterally extending. The base plate 42 is arranged at a radially inner side of the fixing portion 32. The upper surface of the base plate 41 is provided with a signal processing circuit 43, and the upper surface of the base plate 42 is provided with a signal processing circuit 45. The signal processing circuit 43 and the signal processing circuit 45 are electrically connected by an electrical connector 44 arranged on the support seat 3. For example, the lower surface of the base plate 41 is provided with a plurality of electrical contact portions 412 electrically connected to the base plate 41, the signal processing circuit 45 includes a plurality of electrical contact portions 451 corresponding to the electrical contact portions 412, and the electrical connector 44 is a longitudinally arranged and compressed conductive coil spring, and the upper and lower ends of the conductive coil spring are electrically connected to the corresponding electrical contact portions 412 and 451, respectively, so as to electrically connect the signal processing circuit 43 and the signal processing circuit 45. Preferably, the electrical contact portions 412 are electrically connected by metalized vias penetrating through the base plate 41. Preferably, the main body portion 33 is provided with a retaining hole 33b for retaining the conductive coil spring and connecting the upper and lower sides of the main body portion 33.

[0037] The terminal is preferably a stepped spring terminal, i.e. it comprises at least an upper section, a lower section and a transition section connecting the upper section and the lower section, the outer diameter of the upper section being smaller than that of the lower section. The signal processing circuit 43 further comprises a plurality of electrical contacts 411 which are in electrical contact with the lower ends of the spring terminals 8 provided. The lower part of the spring terminals 8 is held in a longitudinal holding hole 51a formed in the holder body 51, the upper part of the spring terminals 8 is held in a longitudinal holding hole 7b formed in the electrical connector 7, and the upper end of the spring terminals 8 extends upwardly from the holding hole 7b to be electrically connected to an external device. The holding hole 7b is preferably a stepped hole, and the transition section is preferably tightly coiled so as to be pressed by the stepped surface of the stepped hole. The lower section comprises at least a loosely coiled elastic part, and the upper section preferably comprises a tightly coiled rigid part to be inserted into the external device.

[0038] The present application provides two laterally extending substrates as the base of the circuit, and ensures the area of the electronic components to be installed under the premise of relatively low lateral dimension.

[0039] The lower side surface of the substrate 41 is spaced apart from the upper side surface of the metal elastic diaphragm 20 by a gap 201, the height of the gap 201 being preferably as small as possible under the premise of allowing the predetermined upward deformation of the metal elastic diaphragm 20, for example, 1.5mm-3mm. The middle part of the substrate 41 can be provided with a via hole 41a, and the pressure sensing circuit 200 is electrically connected between the signal processing circuit 43 on the upper side surface of the substrate 41 and the pressure sensing circuit 200 on the upper side surface of the metal elastic diaphragm 20 through a plurality of leads (not labeled) passing through the via hole 41a. The substrate 41 can be fixed to the support seat 3 in a suitable manner, for example, the lower side surface of the substrate 41 can be bonded to the upper end of the main body part 33, and in order to leave more available area on the substrate 41, the edge of the lower side surface of the substrate 41 is preferably bonded to the upper end of the main body part 33 to form a continuous annular plane or an intermittent annular plane.

[0040] In the present embodiment, the support base 3 comprises a main body portion 33, and a generally downwardly extending metal compression portion 31 for pressing and fixing the substrate 41 downwardly. The compression portion 31 can be in the shape of a thin shell, which can circumferentially surround the substrate 41. The lower end of the compression portion 31 can be molded into the main body portion 33. The substrate 41 is arranged radially inwardly of the compression portion 31. The upper end of the compression portion 31 is inwardly bent to form a compression edge 311, which is pressed downwardly to a compression seat 5 via a sealing ring 91 arranged between the compression edge 311 and the step surface 5c, and the compression seat 5 presses the substrate 41 downwardly to the main body portion 33. Similarly, the compression portion 31 can also extend continuously in the circumferential direction to form a whole circle, or be divided into a plurality of portions arranged in the circumferential direction. The lower end edge of the electrical connector 7 extends downwardly to form a support flange 71 extending into the interior of the barrel 6 and supported by the main body portion 33, and the compression portion 31 is arranged outwardly of the compression seat 5 and inwardly of the support flange 71. The compression seat 5 and the main body portion 33 are both made of insulating material, and the main body portion 33 is made of plastic.

[0041] The compression seat 5 can comprise a compression seat main body 51, and the outer edge of the compression seat main body 51 extends downwardly to form a surrounding wall 52 abutting against the upper side surface of the substrate 41. The compression seat main body 51 further forms an upwardly extending step surface 5c, and the compression edge 311 is pressed downwardly to the step surface 5c. The lower end of the surrounding wall 52 can abut against the upper side surface of the substrate 41, and preferably abut against the edge of the upper side surface of the substrate 41. In this way, the compression seat 5 and the upper side surface of the substrate 41 form a cavity 5a, and some electronic components 431 constituting the signal processing circuit 43 can be arranged in the cavity 5a. The electrical contact portion 411 described above is arranged in the cavity 5a. In some other schemes, additionally or alternatively, the lower end of the surrounding wall 52 can also be fixed to the support base 3 by means of adhesion.

[0042] Specifically, the pressure base body 51 can also extend downward to form a surrounding wall 53, which abuts against or approaches the upper surface of the substrate 41 to form a cavity 5b surrounding the upper end of the through hole 41a. The cavity 5a is formed by the surrounding wall 52, the surrounding wall 53 and the upper surface of the substrate 41. The cavity 5b is connected to the upper surface of the pressure base 5 through a hole 5d provided on the pressure base body 51. The cavity 5b and the through hole 41a can be filled with gel 400 covering the lead wire. The gel 400 can also partially overflow downward into the gap 201 to cover the lower part of the lead wire (the gel in the gap 201 can be first applied to the metal elastic diaphragm 20 to cover the lower part of the lead wire and then allowed to cure for a period of time). At this time, the pressure base 5 can act as a frame in the prior art to hold the gel 400. Preferably, a waterproof and breathable membrane 501 can be bonded to the upper surface of the hole 5d. While preventing water vapor from entering the cavity 5b, the hole 7b is kept connected to the environment through the gap (unmarked) left between the electrical connector 7 and the pressure seat 5. This allows the ambient reference pressure to be introduced onto the upper surface of the metal elastic diaphragm 20, thereby measuring the relative pressure of the pressure medium to be measured relative to the environment, i.e., the gauge pressure.

[0043] The edge of the metal elastic diaphragm 20 can extend radially outward relative to the support wall 21 to form an enlarged portion 22, thereby increasing the rigidity of the edge portion of the metal elastic diaphragm 20. The lower surface of the substrate 42 can be bonded to the upper surface 1d of the pressure interface 1. At this time, the middle part of the substrate 42 is provided with at least one clearance hole 42a that allows the support plate 111 to pass longitudinally, so that during assembly, the substrate 42 can be assembled to the pressure interface 1 before the support wall 21.

[0044] The clearance hole 42a, connecting flange 11, support plate 111, metal elastic diaphragm 20, and clearance hole 33a can all be concentrically arranged circles in cross-sectional shape on the transverse plane. The pressing part 31 and the fixing part 32 can be integrally connected.

[0045] Please see Figure 2In the pressure sensor of the second embodiment, the fixed portion 32 and the main body portion 33 can be integrally made of the same material. The fixed portion 32 is divided into a plurality of circumferentially spaced portions, and the fixed portion 32 is clamped on the flange portion 1c. The sealing ring 91 can be omitted, so that the pressing edge 311 can be directly pressed downward to the step surface 5c. The pressure seat 5 further comprises at least one ring-shaped connecting portion 531, which is connected to the upper end of the surrounding wall 53 and the pressure seat main body 51 respectively. In this way, the surrounding wall 53 and the connecting portion 531 as a whole have relatively high longitudinal expansion and contraction deformation capability, so that the lower end of the surrounding wall 53 elastically abuts against the upper side surface of the base plate 41, to avoid the deformation of the base plate 41 caused by excessive pressure when the lower end of the surrounding wall 53 abuts against the upper side surface of the base plate 41. In addition, the relief hole 42a not only allows the support disc 111 to pass longitudinally, but also allows the enlarged portion 22 to pass longitudinally, so that the edge portion of the upper side surface of the base plate 42 can be preliminarily bonded to the lower side surface of the main body portion 33, and then assembled with the support seat 3 to the pressure interface 1.

[0046] Preferably, the radially inner side edge and the radially outer side edge of the connecting portion 531 are at different vertical heights, and the lower edge of the connecting portion 531 is connected to the pressure seat main body 51, and the upper edge of the connecting portion 531 is connected to the upper end of the surrounding wall 53, so as to further improve the longitudinal expansion and contraction deformation capability of the surrounding wall 53 and the connecting portion 531 as a whole.

[0047] Please refer to Figure 3 In the pressure sensor of the third embodiment, the upper end edge of the retaining hole 51a is protruded upward to form an extension portion 511, so as to increase the longitudinal height of the retaining hole 51a, to better retain the spring terminal 8. When the height of the retaining hole 51a is sufficient, the spring terminal 8 can be inserted into the retaining hole 51a first, and then retained in a vertical state by the retaining hole 51a. In addition, the relief hole 42a not only allows the support disc 111 to pass longitudinally, but also allows the enlarged portion 22 to pass longitudinally, so that the edge portion of the upper side surface of the base plate 42 can be preliminarily fixed to the lower side surface of the main body portion 33, and then assembled with the support seat 3 to the pressure interface 1. The anti-disengagement portion 321 protruding radially inward can be formed on the fixed portion 32 by pressing concave or the like, so as to press the base plate 42 to the lower end surface 1f of the main body portion 33 by the anti-disengagement portion 321. At this time, the anti-disengagement portion 321 is preferably configured as a plurality of circumferentially spaced portions, so that the anti-disengagement portion 321 is easily elastically deformed to make the base plate 42 pass over the anti-disengagement portion 321 when the base plate 42 is installed to the main body portion 33.

[0048] The scope of the disclosure is not intended to be limited by the detailed description, but is instead defined by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.

Claims

1. A pressure sensor, characterized in that, include: The housing includes a longitudinally extending metal cylindrical shell (6), a metal pressure port (1) fixed to the lower end of the cylindrical shell (6), and an electrical connector (7) extending into the cylindrical shell (6) at its lower end; a pressure inlet channel (100) is provided on the pressure port (1); A pressure-sensitive element (2) is fixed to one end of the inner side of the pressure introduction channel (100); The support base (3) includes a main body (33) and a fixing part (32) fixed to the lower end of the main body (33) and fixed to the pressure interface (1); the upper end of the shell (6) forms a first pressing edge (61) that presses the lower end of the electrical connector (7) to the main body (33); the main body (33) is provided with a first clearance hole (33a) surrounding at least a portion of the pressure sensitive element (2); A first substrate (41) fixed to the upper surface of the main body (33) has its lower surface close to the pressure-sensitive element (2) and a gap (201) between it and the pressure-sensitive element (2). Its upper surface is provided with a first signal processing circuit (43) that is electrically connected to the pressure-sensitive element (2) through a lead wire, and has a through hole (41a) that allows the lead wire to pass through vertically. The second substrate (42) is provided with a second clearance hole (42a) located radially inside the fixing part (32) and allowing the pressure sensitive element (2) to pass through, and a second signal processing circuit (45) is provided on its upper surface; A compressed conductive helical spring is held in a first holding hole (33b) provided on the main body (33), with its lower end electrically contacting the second signal processing circuit (45) and its upper end electrically contacting the first electrical contact portion (412) provided on the lower surface of the substrate (41) and electrically connected to the first signal processing circuit (43). and terminals disposed on electrical connectors (7), which are electrically connected to the first substrate (41).

2. The pressure sensor according to claim 1, characterized in that, It also includes a pressure seat (5) fixed to the first substrate (41); the terminal is a spring terminal (8); the pressure seat (5) is provided with a first retaining hole (51a) for retaining the lower part of the spring terminal (8); the electrical connector (7) is provided with a third retaining hole (7b) for retaining the upper part of the spring terminal (8).

3. The pressure sensor according to claim 2, characterized in that, The pressure base (5) includes a pressure base body (51) forming the first retaining hole (51a) and a first enclosure wall (52) formed by the downward extension of the edge of the pressure base body (51) and bonded to the edge of the upper surface of the first substrate (41).

4. The pressure sensor according to claim 2, characterized in that, The pressure seat (5) includes a pressure seat body (51) forming the first retaining hole (51a) and a first enclosure wall (52) extending downward from the edge of the pressure seat body (51) and abutting against the edge of the upper surface of the first substrate (41); the support seat (3) also includes a pressing part (31) with its lower end molded in the main body (33), and the upper end of the pressing part (31) is bent inward to form a second pressing edge (311) for pressing the pressure seat (5) downward.

5. The pressure sensor according to claim 2, characterized in that, The pressure base (5) includes a pressure base body (51) forming the first retaining hole (51a), a first enclosure wall (52) extending downward from the edge of the pressure base body (51) and abutting against the edge of the upper surface of the first substrate (41), and a second enclosure wall (52) extending downward from the pressure base body (51); the second enclosure wall (52) approaches or abuts against the upper surface of the first substrate (41) and forms a cavity (5b) between the second enclosure wall (52) and the first substrate (41) surrounding the upper end of the through hole (41a); the first enclosure wall (52), the second enclosure wall (52) and the first substrate (41) form a cavity (5a), and the first signal processing circuit (43) includes a second electrical contact portion (411) located in the cavity (5a) and electrically contacting the lower end of the spring terminal (8).

6. The pressure sensor according to claim 5, characterized in that, The cavity (5b) is filled with a gel (400) covering the lead wire.

7. The pressure sensor according to claim 6, characterized in that, The pressure sensing element (2) has a pressure sensing circuit (200) on the side surface away from the pressure introduction channel (100) provided with a lead wire electrically connected to the first signal processing circuit (43). The gel (400) partially fills the gap (201) to cover the pressure sensing circuit (200).

8. The pressure sensor according to claim 5, characterized in that, The lower end of the second enclosure (52) elastically abuts against the first substrate (41).

9. The pressure sensor according to claim 8, characterized in that, The pressure seat (5) also includes at least one thin-shell-shaped connecting part (531) whose radial inner and outer edges are respectively connected to the upper end of the second enclosure wall (52) and the pressure seat body (51).

10. The pressure sensor according to claim 8, characterized in that, The fixing part (32) includes a plurality of parts made of metal material and spaced apart in the circumferential direction. The fixing part (32) protrudes inward to form an anti-detachment part (321) to prevent the second substrate (42) from falling off downward.

Images