Pressure sensor

Abstract

A pressure sensor capable of being reliably sealed under high pressure comprises a shell internally provided with an installation cavity, and the shell comprises an outer shell and an end button connected to one side of the longitudinal top of the outer shell; the top of the shell sinks towards one side of the bottom to form a groove; the bottom of the housing is provided with a pressure guiding hole whose top end is communicated with the bottom of the groove. The pressing ring, the seat body and the sealing ring are sequentially arranged in the groove from one side of the top to one side of the bottom; the pressing ring is fixedly connected into the groove and presses the seat body towards one side of the bottom; the seat body is provided with a pressure via hole which is communicated with two sides of the top and the bottom of the seat body, and the pressure via hole is hermetically connected to the bottom of the groove through a sealing ring under the compression of the compression ring; the sealing ring surrounds the bottom end of the pressure via hole and the top end of the pressure guide hole; the pressure sensitive element is fixedly plugged at the top end of the pressure via hole; and the electronic module assembly comprises a substrate fixed at the top of the seat body, and one side of the top of the substrate is provided with a processing circuit electrically connected to the pressure sensitive element.

Description

TECHNICAL FIELD

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

[0002] In the existing pressure sensor, the top of the shell is usually provided with a pressing edge formed by pressure riveting to provide a pressing force to press the base downward so as to form a pressure seal between the base and the shell through the sealing ring, thereby isolating the elements inside the sensor from the pressure medium to be measured. However, when the pressure of the pressure medium to be measured is large, the pressing edge may not be sufficient to provide the above-mentioned pressing force. In addition, under the action of a large pressing force, the pressure sensitive element is easily disturbed by the above-mentioned pressing force and a large measurement error is generated. On the other hand, when the base of the pressure sensitive element is pressed by the pressing force, stress interference is easily formed on the pressure sensitive element fixed on the base. CONTENT OF THE UTILITY MODEL

[0003] In view of the deficiencies of the prior art, the present application provides a pressure sensor to solve at least one of the above-mentioned defects.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: To achieve the above-mentioned purpose, the present application provides the following technical scheme: a pressure sensor, comprising:

[0005] A shell with an installation cavity inside, comprising an outer shell and an end button connected to one side of the longitudinal top of the outer shell; the top of the outer shell is recessed towards one side of the bottom to form a recess; the bottom of the outer shell is formed with a pressure guide hole with a top end connected to the bottom of the recess;

[0006] A pressing ring, a seat body and a sealing ring are sequentially arranged in the recess from one side of the top to one side of the bottom; the pressing ring is fixedly connected in the recess and presses the seat body towards one side of the bottom; the seat body has a pressure through hole connecting the top and the bottom of the seat body, which is sealingly connected to the bottom of the recess through the sealing ring under the pressing of the pressing ring; the sealing ring surrounds the bottom end of the pressure through hole and the top end of the pressure guide hole;

[0007] A pressure sensitive element fixedly plugged into the top end of the pressure through hole;

[0008] And an electronic module assembly, comprising a substrate fixed to the top of the seat body, and one side of the top of the substrate is provided with a processing circuit electrically connected to the pressure sensitive element.

[0009] Preferably, the pressing ring is interference-fitted or screw-connected to the inner wall of the recess.

[0010] Preferably, the seat body comprises an axial and longitudinal disc-shaped main body portion, a top surface of the main body portion extends laterally, the main body portion comprises a first support portion and a second support portion surrounding the periphery of the first support portion; the base plate is fixedly attached to the top surface of the first support portion; the compression ring is compressed towards the bottom side of the second support portion; a groove is formed between the top surface of the first support portion and the top surface of the second support portion to separate the two.

[0011] Preferably, the sealing ring is pressed upwards against the first support portion.

[0012] Preferably, the outer peripheral contour of the sealing ring is directed towards the top side of the groove.

[0013] Preferably, the groove comprises an upper portion for accommodating the compression ring and a lower portion for accommodating the sealing ring.

[0014] Preferably, the groove further comprises a support step connecting the upper portion and the lower portion in the radial direction, the support step is supported on the bottom of the main body portion towards the top side.

[0015] Preferably, the seat body further comprises a longitudinal disc-shaped main body portion and a protrusion protruding downwards from the bottom of the main body portion and extending into the inside of the sealing ring, the bottom end of the pressure through hole is arranged on the bottom surface of the protrusion.

[0016] Preferably, a circumferential positioning portion is formed on the outer wall of the main body portion.

[0017] Preferably, a plurality of terminals are molded on the end knob; one end of the terminal extends into the inside of the mounting cavity and is electrically connected to the electronic module assembly, and the outer side end has an electrical contact surface exposed to the outside of the end knob to form electrical contact with external equipment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A perspective view of a pressure sensor of a first embodiment;

[0019] Figure 2 A top view of a pressure sensor of a first embodiment;

[0020] Figure 3 A sectional view of a pressure sensor of a first embodiment along A-A shown in Figure 2 ;

[0021] Figure 4 A sectional view of a pressure sensor of a first embodiment along B-B shown in Figure 2 ;

[0022] Figure 5 A sectional view of a pressure sensor of a second embodiment;

[0023] Explanation of reference signs: 100, pressure sensor; 10, pressure introduction hole; 11a, upper part; 11b, lower part; 11, groove; 12, thin wall part; 13, pressure edge; 1a, sealing groove; 1, shell; 21a, clamping groove; 21, convex part; 22, wall part; 23, main body part; 24, positioning column; 2, end knob; 30a, circumferential positioning part; 30b, groove; 30c, pressure via hole; 31, main body part; 32, convex part; 3a, first support part; 3b, second support part; 3, seat body; 401, lead wire; 40, pressure sensitive element; 41a, allowance part; 41, substrate; 42, processing circuit; 43, electric connection element; 44, frame; 4, electronic module assembly; 5, pressure ring; 61, horizontal part; 62, vertical part; 6, terminal; 7, sealing ring; 8, sealing ring; 9, sealing ring. DETAILED DESCRIPTION

[0024] 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 used to explain the present application, but 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.

[0025] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like 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.

[0026] In addition, the terms "mounting", "connecting", and "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] It should be further understood that the term "and / or" used in the specification and corresponding claims of the present application means any combination of one or more of the listed items and all possible combinations.

[0028] Please refer to Figures 1-4 In the first embodiment, the pressure sensor 100 comprises a housing (not labeled), a compression ring 5, a seat body 3 and a sealing ring 9. The housing has an installation cavity inside, which can comprise a shell 1 and an end knob 2 connected to the upper side of the longitudinal top part of the shell 1 (the upper part in Figure 3 , Figure 4 the shell 1 can be recessed towards the bottom side of the bottom part (the lower part in Figure 3 , Figure 4 the shell 1 can be recessed towards the bottom side of the bottom part (the lower part in

[0029] The compression ring 5, the seat body 3 and the sealing ring 9 are sequentially arranged in the recess 11 from the top side to the bottom side. The compression ring 5 is fixedly connected in the recess 11 and presses the seat body 3 towards the bottom side. The seat body 3 has a pressure through hole 30c that is connected to the bottom of the recess 11 in a sealed manner through the sealing ring 9 under the pressing of the compression ring 5, and the sealing ring 9 surrounds the top end of the pressure through hole 30c and the top end of the pressure introduction hole 10, so that the top end of the pressure introduction hole 10 and the bottom end of the pressure through hole 30c are in sealed communication.

[0030] The pressure sensor 100 further comprises an electronic module assembly 4 and at least one pressure sensitive element 40, which can be fixedly sealed at the top end of the pressure through hole 30c by sealing glue to obtain the pressure of the pressure medium to be measured.

[0031] The electronic module assembly 4 comprises a substrate 41 fixed to the top of the seat body 3, and a processing circuit 42 is arranged on one side of the top of the substrate 41, which can be electrically connected to the pressure sensitive element 40 through a lead 401. The substrate 41 can be provided with a hole-shaped or notched-shaped accommodation portion 41a to accommodate the pressure sensitive element 40. In addition, a frame 44 surrounding the pressure sensitive element 40 and the lead 401 can be fixed to the surface of the top side of the substrate 41, and the frame 44 is filled with protective gel (not labeled) covering the pressure sensitive element 40 and the lead 401.

[0032] The compression ring 5 can be connected to the inner wall of the recess 11 by interference fit, so that the compression ring 5 provides sufficient pressing force to the seat body 3. Alternatively, the compression ring 5 can also be threadedly connected to the inner wall of the recess 11.

[0033] In particular, the seat body 3 can include an axial and longitudinal disc-shaped main body portion 31. The top surface of the main body portion 31 extends in a transverse direction. The main body portion 31 includes a first support portion 3a and a second support portion 3b surrounding the periphery of the first support portion 3a. The substrate 41 can be fixedly attached to the top surface of the first support portion 3a by means of glue. The compression ring 5 can be compressed towards the bottom side to the second support portion 3b. In order to avoid excessive compression force to form stress interference to the pressure sensitive element 40, a groove 30b can be formed between the top surface of the first support portion 3a and the top surface of the second support portion 3b to separate the two.

[0034] In particular, the seat body 3 can include an axial and longitudinal disc-shaped main body portion 31. The top surface of the main body portion 31 extends in a transverse direction. The main body portion 31 includes a first support portion 3a and a second support portion 3b surrounding the periphery of the first support portion 3a. The substrate 41 can be fixedly attached to the top surface of the first support portion 3a by means of glue. The compression ring 5 can be compressed towards the bottom side to the second support portion 3b. In order to avoid excessive compression force to form stress interference to the pressure sensitive element 40, a groove 30b can be formed between the top surface of the first support portion 3a and the top surface of the second support portion 3b to separate the two.

[0035] In other embodiments, preferably, the recess 11 includes an upper portion 11a for accommodating the compression ring 5 and a lower portion 11b for accommodating the sealing ring 9. More preferably, the recess 11 further includes a support step (not labeled) connecting the upper portion 11a and the lower portion 11b in a radial direction. The support step is supported on the bottom of the main body portion 31 towards the top side. In this way, when the sealing ring 9 is compressed towards the bottom side by the compression ring 5 to a predetermined deformation degree to provide a predetermined compression force, the excess compression force is supported by the support step to be offset.

[0036] In order to facilitate the positioning of the sealing ring 9, the seat body 3 can further include a longitudinal disc-shaped main body portion 31 and a protrusion 32 protruding downwards from the bottom of the main body portion 31 and extending into the inside of the sealing ring 9. The bottom end of the pressure via 30c is arranged on the bottom surface of the protrusion 32. In order to facilitate circumferential positioning by assembly equipment when assembling the seat body 3, circumferential positioning portions 30a can be formed on the outer wall of the main body portion 31.

[0037] In some other embodiments, the housing of the pressure sensor 100 can further include a plurality of terminals 6 molded on the end knob 2. One end of the terminals 6 extends into the mounting cavity and is electrically connected to the electronic module assembly 4, and the outer end thereof has an electrical contact surface (not labeled) exposed outside the end knob 2 for making electrical contact with an external device (not shown). In this case, the housing end knob 2 can be fixed to one side of the top of the housing 1 by means of press riveting, and a thin-walled portion 12 is formed on the top of the housing 1 at a position extending upwardly from the lateral middle or the outer side. The top end of the thin-walled portion 12 is pressed inwardly to form a press edge 13 that presses the end knob 2 toward the bottom side. In this case, the end knob 2 can include a wall portion 22 arranged axially and longitudinally, and the press edge 13 presses the top of the wall portion 22 toward the bottom side. The end knob 2 further includes a main body portion 23 integrally connected to the top of the wall portion 22, which can extend generally laterally, and a convex portion 21 extends from the middle of the main body portion 23 toward the top side. The terminals 6 can include a vertical portion 62 and a horizontal portion 61 integrally connected to the top of the vertical portion 62, wherein the bottom end of the vertical portion 62 extends into the mounting cavity and can be electrically connected to the processing circuit 42 by means of an electrical connecting element 43. The top of the vertical portion 62 is exposed outside the convex portion 21 to form the above-mentioned electrical contact surface. Preferably, the main body portion 23 can extend toward the inside of the mounting cavity to form at least one positioning post 24 that passes through a positioning hole (not labeled) in the electrical connecting element 43 and is then fixed to the positioning hole by means of hot riveting. The bottom of the wall portion 22 presses a sealing ring 8 against a sealing surface lb formed on the top of the housing 1 at a position laterally inwardly. The outer periphery of the convex portion 21 can be formed with a clamping groove 21a for facilitating plugging with an external device. In this case, the end knob 2 can be made of an insulating material such as plastic, and the housing 1 can be made of a metal material.

[0038] In this embodiment, the housing 1 can be cylindrical, and preferably has a fixed outer diameter, and a sealing groove la can be formed on the proximal end of the bottom end of the housing 1, and a sealing ring 7 can be arranged in the sealing groove la to facilitate sealing when the housing 1 is connected to a container containing a pressure medium to be measured. In addition, the pressure ring 5, the wall portion 22, the main body portion 31, the convex portion 32, and the substrate 41 are preferably circular or annular, which facilitates processing and press riveting.

[0039] For further details, please refer to Figure 5In the second embodiment, the pressure ring 5 of the pressure sensor 200 can be integrally connected with the inner circumferential portion of the lower end of the wall portion 22, or pressed toward the bottom side by the inner circumferential portion of the lower end of the wall portion 22, and the pressure ring 5 is not fixedly connected with the inner wall of the upper portion 11a, as compared with the first embodiment. In this way, the pressing force toward the bottom side provided to the main body portion 31 is entirely provided by the pressing edge 13. At this time, although the pressing force can be insufficient, the interference of the pressing force to the pressure sensitive element 40 can be reduced.

[0040] More preferably, the pressure ring 5 of the pressure sensor 200 can be integrally connected with the inner circumferential portion of the lower end of the wall portion 22, and in this case, the sufficient pressing force can be provided by the pressing edge 13 by relatively thickening the thin wall portion 12 and the pressing edge 13. In order to avoid the end knob 2 from being pressed to be broken, the structural strength of the end knob 2 (particularly the wall portion 22) can be increased accordingly, for example, a reinforcing structure (for example, a reinforcing rib) can be integrally connected between the convex portion 21 and the wall portion 22, or the wall portion 22 can be combined (for example, molded) with the convex portion 21 made of plastic, and the wall portion 22 can be made of a metal material such as stainless steel having relatively high structural strength.

[0041] The scope of the disclosure is not limited by the detailed description, but is instead defined by the claims, with equivalents of all parts of the claims being included in the disclosure.

Claims

1. A pressure sensor, characterized by The utility model relates to a pressure sensor, comprising: a housing with an installation cavity in the interior, comprising an outer shell (1) and an end button (2) connected to the longitudinal top side of the outer shell (1); the top of the outer shell (1) is recessed towards the bottom side to form a recess (11); the bottom of the outer shell (1) is formed with a pressure guide hole (10) that is connected to the bottom of the recess (11); a pressure ring (5), a seat body (3) and a sealing ring (9) are sequentially arranged in the recess (11) from the top side to the bottom side; the pressure ring (5) is fixedly connected in the recess (11) and presses the seat body (3) towards the bottom side; the seat body (3) is provided with a pressure through hole (30c) that is connected to the bottom of the recess (11) through the sealing ring (9) under the pressing of the pressure ring (5); the sealing ring (9) surrounds the bottom end of the pressure through hole (30c) and the top end of the pressure guide hole (10); a pressure sensitive element (40) is fixedly blocked at the top end of the pressure through hole (30c); and an electronic module assembly (4) comprising a substrate (41) fixed to the top of the seat body (3), the top side of the substrate (41) being provided with a processing circuit (42) electrically connected to the pressure sensitive element (40).

2. The pressure sensor of claim 1, wherein, The pressure ring (5) is interference fit or screw connected to the inner wall of the recess (11).

3. The pressure sensor of claim 1, wherein, The seat body (3) comprises an axial and longitudinal disc-shaped main body (31), the top surface of the main body (31) extends in the transverse direction, the main body (31) comprises a first support part (3a) and a second support part (3b) surrounding the periphery of the first support part (3a); the substrate (41) is fixedly attached to the top surface of the first support part (3a); the pressure ring (5) is pressed towards the bottom side to the second support part (3b); a groove (30b) is formed between the top surface of the first support part (3a) and the top surface of the second support part (3b) to separate them.

4. The pressure sensor of claim 3, wherein, The sealing ring (9) is pressed upwards to the first support part (3a).

5. The pressure sensor of claim 4, wherein, The outer peripheral contour of the sealing ring (9) is opposite to the groove (30b) towards the top side.

6. The pressure sensor of claim 3, wherein, The recess (11) comprises an upper part (11a) for accommodating the pressure ring (5) and a lower part (11b) for accommodating the sealing ring (9).

7. The pressure sensor of claim 6, wherein, The recess (11) further comprises a support step connecting the upper part (11a) and the lower part (11b) in the radial direction, the support step is supported on the bottom of the main body (31) towards the top side.

8. The pressure sensor of claim 6, wherein, The seat body (3) further comprises a longitudinal disc-shaped main body (31) and a protrusion (32) protruding downwards from the bottom of the main body (31) and extending into the inside of the sealing ring (9), the bottom end of the pressure through hole (30c) is arranged on the bottom surface of the protrusion (32).

9. The pressure sensor according to claim 3, wherein: The outer wall of the main body (31) is formed with a circumferential positioning part (30a).

10. The pressure sensor of claim 1, wherein, Also included are a plurality of terminals (6) molded on the end knob (2); one end of the terminals (6) extends inside the mounting cavity and is electrically connected to the electronic module assembly (4), and the outer end has an electrical contact surface exposed outside the end knob (2) to form electrical contact with external equipment.

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