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 field of sensor technology, and in particular to a pressure sensor. Background Art

[0002] In existing pressure sensors, the top of the shell is usually provided with a pressing force by forming a pressing edge through riveting to press the base downward so that a pressure seal is formed between the sealing ring and the shell, thereby isolating the components inside the sensor from the pressure medium to be measured. However, when the pressure of the pressure medium to be measured is relatively high, the pressing edge may not be sufficient to provide the above-mentioned pressing force. In addition, under the action of a relatively large pressing force, the pressure sensitive element is easily disturbed by the above-mentioned pressing force and a relatively 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. Summary of the invention

[0003] In view of the deficiencies in 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 solutions: To achieve the above-mentioned purpose, the present application provides the following technical solutions: A pressure sensor, comprising:

[0005] A housing having an installation cavity inside, comprising an outer shell and a terminal button connected to one side of the longitudinal top of the outer shell; the top of the outer shell is recessed toward the bottom side to form a groove; the bottom of the outer shell is formed with a pressure-inducing hole having a top end connected to the bottom of the groove;

[0006] A pressure ring, a seat body and a sealing ring are sequentially arranged in the groove from the top side to the bottom side; the pressure ring is fixedly connected in the groove and presses the seat body toward the bottom side; the seat body has a pressure through hole connecting the top and bottom sides thereof, which is sealedly connected to the bottom of the groove through the sealing ring under the pressure of the pressure ring; the sealing ring surrounds the bottom end of the pressure through hole and the top end of the pressure-inducing hole;

[0007] A pressure sensitive element fixedly sealed at the top of the pressure through hole;

[0008] The electronic module assembly comprises a substrate fixed on the top of the seat body, and a processing circuit electrically connected to the pressure sensitive element is arranged on one side of the top of the substrate.

[0009] Preferably, the pressure ring is interference fit or threadedly connected to the inner wall of the groove.

[0010] Preferably, the seat body includes a disc-shaped main body portion axially arranged along the longitudinal direction, the top surface of the main body portion extends laterally, and the main body portion includes a first support portion and a second support portion surrounding the periphery of the first support portion; the substrate is adhered and fixed to the top surface of the first support portion; the pressure ring is pressed toward the bottom side to the second support portion; a circle 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 upwardly against the first supporting portion.

[0012] Preferably, the outer peripheral contour of the sealing ring faces the groove toward the top side.

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

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

[0015] Preferably, the seat body further includes a disc-shaped main body portion extending longitudinally and a convex portion protruding downward from the bottom of the main body portion and extending into the inner side of the sealing ring, and the bottom end of the pressure through hole is arranged on the bottom surface of the convex portion.

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

[0017] Preferably, it also includes a plurality of terminals molded on the terminal button; one end of the terminal extends into the interior of the installation cavity and is electrically connected to the electronic module assembly, and the outer end thereof has an electrical contact surface exposed outside the terminal button for forming electrical contact with an external device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional diagram of the pressure sensor of the first embodiment;

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

[0020] Figure 3 The pressure sensor of the first embodiment is Figure 2 A cross-sectional view of AA shown in FIG;

[0021] Figure 4 The pressure sensor of the first embodiment is Figure 2 A cross-sectional view of BB shown in ;

[0022] Figure 5 is a cross-sectional view of a pressure sensor according to a second embodiment;

[0023] Explanation of the reference numerals: 100, pressure sensor; 10, pressure-inducing hole; 11a, upper part; 11b, lower part; 11, groove; 12, thin-walled part; 13, pressing edge; 1a, sealing groove; 1, shell; 21a, slot; 21, convex part; 22, wall-like part; 23, main body; 24, positioning column; 2, terminal; 30a, circumferential positioning part; 30b, groove; 30c, pressure through hole; 31, main body; 32, convex part; 3a, first supporting part; 3b, second supporting part; 3, seat; 401, lead; 40, pressure sensitive element; 41a, yielding part; 41, substrate; 42, processing circuit; 43, electrical connection element; 44, frame; 4, electronic module assembly; 5, pressing ring; 61, horizontal part; 62, vertical part; 6, terminal; 7, sealing ring; 8, sealing ring; 9, sealing ring. DETAILED DESCRIPTION

[0024] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The following embodiments are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application. In the following description, the same symbols are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0025] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc. indicate directions or positional relationships based on directions or positional relationships shown in the accompanying drawings, or directions or positional relationships in which the products of the present application are usually placed when in use, or directions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the equipment or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limitations on the present 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.

[0026] In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] It should be further understood that the term “and / or” used in the specification and corresponding claims of this application refers to any and all possible combinations of one or more of the listed items.

[0028] Please refer to Figure 1 to Figure 4 In the first embodiment, the pressure sensor 100 includes a housing (not marked), a pressure ring 5, a seat 3 and a sealing ring 9. The housing has an installation cavity inside, which may include a housing 1 and a housing connected to the longitudinal top of the housing 1 ( Figure 3 , Figure 4 The top of the housing 1 can be turned toward the bottom ( Figure 3 , Figure 4 The lower part of the housing 1 is concave on one side to form a groove 11. The bottom of the housing 1 may be formed with a pressure-introducing hole 10 with a top end connected to the bottom of the groove 11, and the pressure-introducing hole 10 is used to introduce the pressure medium to be measured into the interior of the sensor.

[0029] The pressure ring 5, the seat body 3 and the sealing ring 9 are sequentially arranged in the groove 11 from the top side to the bottom side. The pressure ring 5 is fixedly connected in the groove 11 and presses the seat body 3 toward the bottom side. The seat body 3 has a pressure through hole 30c connecting the top and bottom sides thereof, which is sealedly connected to the bottom of the groove 11 through the sealing ring 9 under the compression 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-inducing hole 10, so that the top end of the pressure-inducing hole 10 and the bottom end of the pressure through hole 30c are sealedly connected.

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

[0031] The electronic module assembly 4 includes a substrate 41 fixed to the top of the base 3, and a processing circuit 42 is arranged on one side of the top of the substrate 41. The processing circuit 42 can be electrically connected to the pressure sensitive element 40 through the lead 401. The substrate 41 can be provided with a hole-shaped or notch-shaped making way 41a to make way for the pressure sensitive element 40. Among them, a frame 44 surrounding the pressure sensitive element 40 and the lead 401 can also be fixed on the top side surface of the substrate 41, and the frame 44 is filled with a protective gel (not marked) covering the pressure sensitive element 40 and the lead 401.

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

[0033] Specifically, the seat body 3 may include a disc-shaped main body portion 31 axially arranged in the longitudinal direction. The top surface of the main body portion 31 extends in the 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 may be fixed to the top surface of the first support portion 3a by gluing. The pressure ring 5 may be pressed against the second support portion 3b toward the bottom side. In order to prevent excessive pressing force from causing stress interference to the pressure sensitive element 40, a circle groove 30b may 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] The sealing ring 9 is pressed upward to the bottom of the seat body 3, preferably to the bottom of the first support portion 3a. Preferably, the outer peripheral contour of the sealing ring 9 can be directly opposite to the groove 30b toward the top side.

[0035] In some other solutions, preferably, the groove 11 includes an upper portion 11a for accommodating the pressure ring 5 and a lower portion 11b for accommodating the sealing ring 9. More preferably, the groove 11 also includes a support step (not marked) connecting the upper portion 11a and the lower portion 11b in the radial direction. The support step is supported on the bottom of the main body 31 toward the top side. In this way, when the sealing ring 9 is pressed toward the bottom side by the pressure ring 5 and reaches a predetermined deformation degree to provide a predetermined pressing force, the excess pressing force is supported and offset by the support step.

[0036] In order to facilitate the positioning of the sealing ring 9, the seat body 3 may also include a disc-shaped main body 31 extending longitudinally and a convex portion 32 protruding downward from the bottom of the main body 31 and extending into the inner side of the sealing ring 9. The bottom end of the pressure through hole 30c is arranged on the bottom surface of the convex portion 32. In order to facilitate the circumferential positioning by the assembly equipment when assembling the seat body 3, a circumferential positioning portion 30a may be formed on the outer wall of the main body 31.

[0037] In some other schemes, preferably, the housing of the pressure sensor 100 may also include a plurality of terminals 6 molded on the terminal button 2. One end of the terminal 6 extends into the interior of the installation cavity and is electrically connected to the electronic module assembly 4, and the outer end thereof has an electrical contact surface (not marked) exposed to the outside of the terminal button 2 for forming electrical contact with an external device (not shown). The housing terminal button 2 can be fixed to one side of the top of the housing 1 by riveting, and the horizontal middle or outer position of the top of the housing 1 extends upward to form a circle of thin-walled portion 12. The top of the thin-walled portion 12 is folded inward to form a circle of pressing edge 13 that presses the terminal button 2 toward the bottom side. For example, the terminal button 2 may include a circle of wall-like portions 22 arranged axially and longitudinally, and the pressing edge 13 is pressed against the top of the wall-like portion 22 toward the bottom side. The terminal button 2 also includes a main body portion 23 that is integrally closed and connected to the top of the wall-like portion 22, and the main body portion 23 can generally extend in the horizontal direction, and the middle of the main body portion 23 extends toward the top side to form a circle of convex portions 21. The terminal 6 may include a vertical portion 62 and a horizontal portion 61 with one end integrally connected to the top of the vertical portion 62, wherein the bottom end of the vertical portion 62 extends into the installation cavity and can be electrically connected to the processing circuit 42 through an electrical connection element 43. The top of the vertical portion 62 is exposed to the outside of 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 installation cavity to form at least one positioning column 24, and the positioning column 24 is penetrated through a positioning hole (not marked) on the electrical connection element 43, and can then be fixed to the above-mentioned positioning hole by hot riveting. The bottom of the wall-shaped portion 22 presses a sealing ring 8 toward the bottom side to a circle of sealing surface 1b formed on the lateral inner position of the top of the housing 1. The outer periphery of the convex portion 21 may be formed with a card slot 21a to facilitate plugging with an external device. Among them, the terminal button 2 can be made of insulating materials such as plastic, and the housing 1 can be made of metal material.

[0038] In this embodiment, the housing 1 may be cylindrical, and more preferably, the outer diameter of the housing 1 is a fixed value, and a sealing groove 1a may be provided on the proximal end of the bottom end thereof, and a sealing ring 7 may be provided in the sealing groove 1a to facilitate sealing when connected to a container containing a pressure medium to be measured. In addition, the pressure ring 5, the wall-shaped portion 22, the main body 31, the convex portion 32, and the base plate 41 are preferably circular or annular, which can facilitate processing and riveting.

[0039] Please refer to Figure 5Compared with the first embodiment, in the second embodiment, the pressure ring 5 of the pressure sensor 200 can be integrally connected with the inner peripheral portion of the lower end of the wall-shaped portion 22, or pressed toward the bottom side by the inner peripheral portion of the lower end of the wall-shaped portion 22, while the pressure ring 5 is not fixedly connected to the inner wall of the upper portion 11a. In this way, the pressing force provided to the main body 31 toward the bottom side is completely provided by the pressing edge 13. At this time, although the pressing force may be insufficient, it can still play a role in reducing the interference of the pressing force on the pressure sensitive element 40.

[0040] More preferably, the pressure ring 5 of the pressure sensor 200 can be integrally connected to the inner circumference of the lower end of the wall-like portion 22. In this case, while the thin-wall portion 12 and the pressing edge 13 are relatively thickened, sufficient clamping force can be provided by the pressing edge 13. In order to avoid the terminal button 2 from being crushed, the structural strength of the terminal button 2 (especially the wall-like portion 22) can be increased accordingly. For example, a reinforcing structure (such as reinforcing ribs) can be integrally connected between the convex portion 21 and the wall-like portion 22, or the wall-like portion 22 can be combinedly connected (for example, molded) to the plastic convex portion 21, and the wall-like portion 22 can be made of a metal material such as stainless steel with relatively high structural strength.

[0041] 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, characterized in that: include: A housing having an installation cavity therein comprises an outer shell (1) and a terminal button (2) connected to one side of the longitudinal top of the outer shell (1); the top of the outer shell (1) is recessed toward the bottom to form a groove (11); the bottom of the outer shell (1) is formed with a pressure-inducing hole (10) whose top end is connected to the bottom of the groove (11); A pressure ring (5), a seat body (3) and a sealing ring (9) are sequentially arranged in the groove (11) from the top side to the bottom side; the pressure ring (5) is fixedly connected in the groove (11) and presses the seat body (3) toward the bottom side; the seat body (3) has a pressure through hole (30c) connecting the top and bottom sides thereof, which is sealedly connected to the bottom of the groove (11) through the sealing ring (9) under the pressure 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-inducing hole (10); A pressure sensitive element (40) fixedly sealed at the top of the pressure through hole (30c); and an electronic module assembly (4), comprising a substrate (41) fixed to the top of the base (3), wherein a processing circuit (42) electrically connected to the pressure sensitive element (40) is provided on one side of the top of the substrate 41.

2. The pressure sensor according to claim 1, characterized in that: The pressure ring (5) is interference fit or threadedly connected to the inner wall of the groove (11).

3. The pressure sensor according to claim 1, characterized in that: The seat body (3) comprises a disc-shaped main body (31) axially arranged along the longitudinal direction, the top surface of the main body (31) extends along the transverse direction, and the main body (31) comprises a first support portion (3a) and a second support portion (3b) surrounding the first support portion (3a); the base plate (41) is fitted and fixed to the top surface of the first support portion (3a); the pressure ring (5) is pressed against the second support portion (3b) toward the bottom side; a circle groove (30b) is 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.

4. The pressure sensor according to claim 3, characterized in that: The sealing ring (9) is pressed upwards against the first supporting portion (3a).

5. The pressure sensor according to claim 4, characterized in that: The outer peripheral contour of the sealing ring (9) faces the groove (30b) toward the top side.

6. The pressure sensor according to claim 3, characterized in that: The groove (11) comprises an upper portion (11a) for accommodating the pressure ring (5) and a lower portion (11b) for accommodating the sealing ring (9).

7. The pressure sensor according to claim 6, characterized in that: The groove (11) further comprises a supporting step connecting the upper part (11a) and the lower part (11b) in the radial direction, and the supporting step is supported on the bottom of the main body (31) toward the top side.

8. The pressure sensor according to claim 6, characterized in that: The seat body (3) further comprises a disc-shaped main body (31) extending longitudinally and a convex portion (32) protruding downward from the bottom of the main body (31) and extending into the inner side of the sealing ring (9), and the bottom end of the pressure through hole (30c) is arranged on the bottom surface of the convex portion (32).

9. The pressure sensor according to claim 3, characterized in that: A circumferential positioning portion (30a) is formed on the outer wall of the main body (31).

10. The pressure sensor according to claim 1, characterized in that: It also includes a plurality of terminals (6) molded on the terminal button (2); one end of the terminal (6) extends into the interior of the installation cavity and is electrically connected to the electronic module assembly (4), and the outer end thereof has an electrical contact surface exposed to the outside of the terminal button (2) for forming electrical contact with an external device.

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