Pressure sensor

Abstract

The invention provides a pressure sensor, the structure of the pressure sensor is shown in figure 1, the pressure sensor comprises a shell, a pressure joint, a pressure sensitive element, an electronic module assembly, a plurality of terminals and a metal shielding cover, one end of the pressure joint is fixedly connected with a port of the shell to define a mounting cavity; the pressure sensitive element is hermetically plugged at one end, facing the mounting cavity, of the pressure introduction channel; the electronic module assembly is fixedly arranged in the mounting cavity and is electrically connected to the pressure sensitive element; the plurality of terminals are fixedly arranged on the shell, and one end of each terminal extends into the mounting cavity so as to be electrically connected to the electronic module assembly; and the metal shielding cover is fixedly arranged on the shell, and at least one part of the plurality of terminals is enclosed in the metal shielding cover at the same time. According to the pressure sensor provided by the invention, the metal shielding cover arranged on the shell simultaneously encloses at least one part of the plurality of terminals, so that electromagnetic shielding protection can be provided for the terminals, and the problem that external electromagnetic energy interferes with the terminals is avoided.

Description

Technical Field

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

[0002] Pressure sensors are more susceptible to the negative effects of electromagnetic interference or electrical disturbances than other sensors. For example, a pressure sensor converts pressure into an electrical signal, which may be interfered with by electromagnetic energy from another source that passes through the path of the electrical signal, thereby interfering with the operation of the receiver.

[0003] In order to solve the problem of interference of external electromagnetic energy on the pressure sensor, it is necessary to shield the interference of external electromagnetic energy on the terminal. Summary of the invention

[0004] Based on the above problems existing in the prior art, the present invention aims to provide a pressure sensor to solve the technical problem that external electromagnetic energy may interfere with the terminals in the pressure sensor.

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

[0006] shell;

[0007] A pressure connector, one end of which is fixedly connected to the port of the housing to enclose a mounting cavity, and the pressure connector has a pressure introduction channel for introducing a pressure medium into the mounting cavity;

[0008] A pressure sensitive element, hermetically sealed at one end of the pressure introduction channel toward the installation cavity, for responding to the pressure of the pressure medium to be measured and generating a corresponding electrical signal;

[0009] An electronic module assembly, fixedly disposed in the mounting cavity and electrically connected to the pressure sensitive element;

[0010] A plurality of terminals are fixedly arranged on the housing, and one end of each terminal extends into the mounting cavity to be electrically connected to the electronic module assembly;

[0011] and a metal shielding cover, which is fixedly arranged on the housing and simultaneously surrounds at least a part of the plurality of terminals inside the metal shielding cover.

[0012] According to one embodiment of the present invention, the housing includes a shell portion extending generally up and down and a cover portion integrally connected to the inner side of the shell portion, the terminal is fixedly arranged on the cover portion, one end of the terminal extends into the installation cavity and is electrically connected to the electronic module assembly, and the other end of the terminal passes through the cover portion outwardly.

[0013] According to one embodiment of the present invention, the metal shielding cover includes two metal half shells arranged opposite to each other on the left and right sides; a socket is left between the left and right ends of the cover and the inner wall of the outer shell to allow the metal half shell on the corresponding left and right sides to be inserted downwardly into at least a part of the socket, and the part of the metal half shell inserted into the socket matches the shape and size of the socket.

[0014] According to an embodiment of the present invention, the metal half shell and the plug hole are sealed by a sealant.

[0015] According to an embodiment of the present invention, the metal half shell includes a large diameter portion, a transition connection portion and a small diameter portion which are fixedly connected in sequence, and the transition connection portion is downwardly abutted against a stopper formed on the outer shell.

[0016] According to an embodiment of the present invention, the large diameter portion is clamped in a concave cavity formed by the inner wall of the shell.

[0017] According to an embodiment of the present invention, the large diameter portion is flexible.

[0018] According to one embodiment of the present invention, the electronic module assembly includes an electrically connected circuit board and a flexible circuit board, the circuit board is fixedly disposed in the installation cavity and is electrically connected to the pressure sensitive element; the flexible circuit board is electrically connected to one end of the terminal extending into the installation cavity, and a grounding spring sheet is provided on the flexible circuit board, and the grounding spring sheet is electrically contacted to the inner wall of the metal shielding cover.

[0019] According to an embodiment of the present invention, the lower end of the metal shielding cover passes downward over the lower edge of the terminal.

[0020] According to an embodiment of the present invention, the edge of the pressure connector extends upward to form a metal cylinder shell, the upper end of the metal cylinder shell is connected to the outer shell and passes upward over the lower end edge of the metal shielding cover.

[0021] The beneficial effects of the present invention are:

[0022] In a pressure sensor provided by the present invention, a metal shielding cover arranged on a shell simultaneously surrounds at least a part of a plurality of terminals therein, and can provide electromagnetic shielding protection for the terminals to avoid interference of external electromagnetic energy on the terminals. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 is a structural schematic diagram of a pressure sensor provided in Embodiment 1 of the present invention;

[0025] Figure 2 is a schematic structural diagram of a metal shielding cover in an embodiment of the present invention;

[0026] Figure 3 is another structural schematic diagram of a pressure sensor provided in Embodiment 1 of the present invention;

[0027] Figure 4 is a schematic diagram of the structure of a pressure sensor provided by Embodiment 2 of the present invention;

[0028] Figure markings: 1-housing; 101-stop part; 10-cavity; 11-shell; 12-cover; 2-pressure joint; 20-pressure introduction channel; 21-metal cylinder shell; 22-crimping edge; 3-pressure sensitive element; 4-electronic module assembly; 41-circuit board; 42-flexible circuit board; 5-terminal; 6-metal shielding cover; 61-metal half shell; 611-large diameter part; 612-transition connection part; 613-small diameter part; 7-grounding spring; 8-substrate; 80-via; 9-sealing ring. DETAILED DESCRIPTION

[0029] The following descriptions of the embodiments refer to the attached drawings to illustrate specific embodiments in which the present invention can be implemented.

[0030] Embodiment 1

[0031] The present invention provides a pressure sensor, the structure of which is as follows Figure 1 As shown, it includes a housing 1, a pressure connector 2, a pressure sensitive element 3, an electronic module assembly 4, a plurality of terminals 5 and a metal shielding cover 6, wherein one end of the pressure connector 2 is fixedly connected to the port of the housing 1 to enclose a mounting cavity. The pressure connector 2 has a pressure introduction channel 20 for introducing a pressure medium into the mounting cavity; the pressure sensitive element 3 is sealed at one end of the pressure introduction channel 20 toward the mounting cavity, and is used to respond to the pressure of the pressure medium to be measured and generate a corresponding electrical signal; the electronic module assembly 4 is fixedly arranged in the mounting cavity and electrically connected to the pressure sensitive element 3; a plurality of terminals 5 are fixedly arranged on the housing 1, and one end of the terminal 5 extends into the mounting cavity to be electrically connected to the electronic module assembly 4; the metal shielding cover 6 is fixedly arranged on the housing 1, and at the same time, it encloses at least a part of the plurality of terminals 5 inside it.

[0032] Compared with the prior art, in a pressure sensor provided by the present invention, a metal shielding cover 6 arranged on the housing 1 simultaneously surrounds at least a portion of several terminals 5 therein, and can provide electromagnetic shielding protection for the terminals 5 to avoid interference of external electromagnetic energy on the terminals 5.

[0033] According to an embodiment of the present invention, in order to improve the electromagnetic shielding effect of the terminal 5, the lower end of the metal shielding cover 6 passes downward over the lower end edge of the terminal 5; further, the pressure connector 2 is made of metal material, and its edge can extend upward to form a metal cylinder shell 21, and the upper end of the metal cylinder shell 21 is connected to the housing 1 and passes upward over the lower end edge of the metal shielding cover 6. At this time, the metal cylinder shell 21 can constitute a shielding shell, which can provide electromagnetic shielding protection for the electronic module assembly 4 in the installation cavity. Among them, the metal cylinder shell 21 can be grounded through the electronic module assembly 4.

[0034] Specifically, the housing 1 includes a shell portion 11 extending generally up and down and a cover portion 12 integrally connected to the inner side of the shell portion 11. The terminal 5 is fixedly arranged on the cover portion 12, one end of the terminal 5 extends into the installation cavity and is electrically connected to the electronic module assembly 4, and the other end of the terminal 5 passes through the cover portion 12 outward.

[0035] like Figure 2 The figure shows a schematic diagram of the structure of the metal shielding cover 6 in the first embodiment of the present invention. According to the first embodiment of the present invention, the metal shielding cover 6 includes two metal half shells 61 arranged opposite to each other on the left and right sides, and a plug hole (not shown in the figure) is left between the left and right ends of the cover 12 and the inner wall of the housing 1 to allow the metal half shell 61 on the corresponding side to be inserted downwardly at least partially, and the part of the metal half shell 61 inserted into the plug hole matches the shape and size of the plug hole.

[0036] It should be noted that achieving electromagnetic shielding of the terminal 5 does not require the metal shielding cover 6 to be completely closed in the circumferential direction. That is, when there is a gap in the circumferential direction of the metal shielding cover 6, it can also shield the interference of external electromagnetic energy on the terminal 5 to a large extent. Therefore, when the two metal half shells 61 are respectively inserted into the two sockets, the metal shielding cover 6 composed of the two metal half shells 61 distributed at intervals can also shield the interference of external electromagnetic energy on the terminal 5.

[0037] Furthermore, the metal shielding cover 6 may also be composed of other numbers of metal half shells 61 , rather than being limited to two.

[0038] According to an embodiment of the present invention, the metal half shell 61 and the plug hole may be sealed by a sealant (not shown in the figure) to prevent water vapor from invading the installation cavity and affecting the pressure sensitive element 3 .

[0039] According to one embodiment of the present invention, the metal half shell 61 includes a large diameter portion 611, a transition connection portion 612 and a small diameter portion 613 which are fixedly connected in sequence. The transition connection portion 612 is downwardly pressed against a stop portion 101 formed on the outer shell 1. The stop portion 101 can provide support and positioning for the transition connection portion 612.

[0040] Furthermore, a cavity 10 is formed above the stopper 101 and on the inner wall of the shell 11 , wherein the bottom end of the cavity 10 is the stopper 101 , and the large diameter portion 611 is clamped in a cavity 110 formed by the inner wall of the shell 1 .

[0041] It can be understood that the cavity 10 can position the metal half shell 61 in the horizontal and vertical directions, thereby improving the working stability and reliability of the metal shielding cover 6.

[0042] On this basis, in order to install the large diameter portion 611 in the concave cavity 10 without damaging the large diameter portion 611, the large diameter portion 611 can be set to be flexible; it can be understood that the flexible large diameter portion 611 can be installed in the concave cavity 10 by changing its shape, and the large diameter portion 611 can be restored to its original shape after being installed in the concave cavity 10. Of course, the large diameter portion 611 can also be set to be elastic, and the elastic large diameter portion 611 can also support it to be installed in the concave cavity 10 by deformation.

[0043] According to an embodiment of the present invention, the electronic module assembly 4 may include an electrically connected circuit board 41 and a flexible circuit board 42. The circuit board 41 is fixedly disposed in the mounting cavity and electrically connected to the pressure sensitive element 3. Specifically, the circuit board 41 may be electrically connected to the pressure sensitive element 3 through a lead; the flexible circuit board 42 is electrically connected to one end of the terminal 5 extending into the mounting cavity, and a grounding spring 7 is disposed on the flexible circuit board 42, and the grounding spring 7 is electrically in contact with the inner wall of the metal shielding cover 6.

[0044] Specifically, the way in which the grounding spring sheet 7 achieves electrical contact with the inner wall of the metal shielding cover 6 is: when the metal half shell 61 is inserted downward into the socket, the inner wall of the metal half shell 61 will push the grounding spring sheet 7 to undergo elastic deformation, so as to achieve elastic contact between the grounding spring sheet 7 and the inner wall of the metal half shell 61, thereby achieving electrical contact between the grounding spring sheet 7 and the inner wall of the metal half shell 61; it is easy to understand that although the flexible circuit board 42 is flexible as a whole, it still has a certain rigidity, so as to be sufficient to support the reaction force generated when the grounding spring sheet 7 elastically contacts the inner wall of the metal shielding cover 6.

[0045] According to an embodiment of the present invention, the pressure sensor further comprises a substrate 8 fixedly arranged on the upper end surface of the pressure connector 2 and having a through hole 80. An inner end of the pressure introduction channel 20 is arranged on the upper end surface of the pressure connector 2, and the substrate 8 is sealed at an inner end of the pressure introduction channel 20. One end of the through hole 80 is connected to the pressure introduction channel 20. The circuit board 41 is fixedly arranged on the surface of the substrate 8, and a clearance hole (not shown in the figure) is opened at a position corresponding to the through hole 80 of the circuit board 41, and the pressure sensitive element 3 is sealed at the other end of the through hole 80.

[0046] The edge of the pressure connector 2 extends upward and rolls inward to form a curling edge 22, which cooperates with the shoulder formed by the outer wall of the bottom end of the shell 11 to press the bottom end of the shell 11 against the upper surface of the substrate 8, thereby pressing the substrate 8 against the upper end surface of the pressure connector 2. Further, in order to ensure the sealing effect between the substrate 8 and the pressure connector 2, a sealing ring 9 is also provided between the substrate 8 and the pressure connector 2, and preferably, the sealing ring 9 can be an O-ring.

[0047] Furthermore, the substrate 8 is made of a conductive material, and the bottom end of the metal shielding cover 6 extends toward the substrate 8 to cover the circuit board 41 and the flexible circuit board 42 inside. Figure 3 As shown, the bottom end of the metal shielding cover 6 is electrically connected to the substrate 8.

[0048] It can be understood that the bottom end of the metal shielding cover 6 extends toward the substrate 8 to cover the circuit board 41 and the flexible circuit board 42 inside, and the bottom end of the metal shielding cover 6 is electrically connected to the substrate 8, so that the metal shielding cover 6 can be combined with the substrate 8 to form a shielding tube, thereby shielding the interference of external electromagnetic energy on the circuit board 41 and the flexible circuit board 42.

[0049] Embodiment 2

[0050] Embodiment 2 also provides a pressure sensor, the structure of which is as follows: Figure 4 As shown, the difference between the second embodiment and the first embodiment is that the bottom end of the shell 11 is bonded to the upper end surface of the pressure joint 2 by means of a sealant; at this time, the shell 11 can be directly bonded to the upper end surface of the pressure joint 2 by means of a sealant.

[0051] Compared with the first embodiment, the connection method between the shell 11 and the pressure connector 2 in the second embodiment is simpler, thereby simplifying the assembly process of the pressure sensor.

[0052] To sum up, in a pressure sensor provided by the present invention, the metal shielding cover 6 can independently shield the interference of external electromagnetic energy on the terminal 5. In addition, the bottom end of the metal shielding cover 6 extends toward the substrate 8 to cover the circuit board 41 and the flexible circuit board 42 inside, and the bottom end of the metal shielding cover 6 is electrically connected to the substrate 8, so that the metal shielding cover 6 can be combined with the substrate 8 to form a shielding tube, which can shield the interference of external electromagnetic energy on the circuit board 41 and the flexible circuit board 42, thereby providing electromagnetic protection for the terminal 5 and the electronic module assembly 4.

[0053] It should be noted that although the present invention is disclosed as above by specific embodiments, the above embodiments are not intended to limit the present invention. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A pressure sensor, It is characterized in that include: Housing (1); A pressure connector (2), one end of which is fixedly connected to a port of the housing (1) to enclose and form a mounting cavity, and the pressure connector (2) has a pressure introduction channel (20) for introducing a pressure medium into the mounting cavity; A pressure sensitive element (3) is sealed at one end of the pressure introduction channel (20) facing the installation cavity, and is used to respond to the pressure of the pressure medium to be measured and generate a corresponding electrical signal; An electronic module assembly (4) is fixedly disposed in the mounting cavity and electrically connected to the pressure sensitive element (3); A plurality of terminals (5) are fixedly arranged on the housing (1), and one end of each terminal (5) extends into the installation cavity to be electrically connected to the electronic module assembly (4); and a metal shielding cover (6) which is fixedly arranged on the housing (1) and simultaneously surrounds at least a portion of the plurality of terminals (5) therein.

2. A pressure sensor according to claim 1, It is characterized in that The housing (1) comprises a shell portion (11) extending generally vertically and a cover portion (12) integrally connected to the inner side of the shell portion (11); the terminal (5) is fixedly arranged on the cover portion (12); one end of the terminal (5) extends into the installation cavity and is electrically connected to the electronic module assembly (4); and the other end of the terminal (5) passes through the cover portion (12) outwardly.

3. A pressure sensor according to claim 2, It is characterized in that The metal shielding cover (6) comprises two metal half shells (61) arranged opposite to each other on the left and right sides; a plug hole is respectively left between the left and right ends of the cover (12) and the inner wall of the outer shell (1) for allowing the metal half shell (61) on the corresponding left and right sides to be inserted downwardly at least partially, and the part of the metal half shell (61) inserted into the plug hole matches the shape and size of the plug hole.

4. A pressure sensor according to claim 3, It is characterized in that The metal half shell (61) and the insertion hole are sealed by means of sealant.

5. A pressure sensor according to claim 3, It is characterized in that The metal half shell (61) comprises a large diameter portion (611), a transition connection portion (612) and a small diameter portion (613) which are fixedly connected in sequence, and the transition connection portion (612) is downwardly abutted against a stop portion (101) formed on the outer shell (1).

6. A pressure sensor according to claim 5, It is characterized in that The large diameter portion (611) is clamped in a concave cavity (110) formed by the inner wall of the outer shell (1).

7. A pressure sensor according to claim 5, It is characterized in that The large diameter portion (611) is flexible.

8. A pressure sensor according to claim 1, It is characterized in that The electronic module assembly (4) comprises an electrically connected circuit board (41) and a flexible circuit board (42); the circuit board (41) is fixedly arranged in the installation cavity and electrically connected to the pressure sensitive element (3); the flexible circuit board (42) is electrically connected to one end of the terminal (5) extending into the installation cavity, and a grounding spring (7) is arranged on the flexible circuit board (42), and the grounding spring (7) is electrically in contact with the inner wall of the metal shielding cover (6).

9. A pressure sensor according to claim 1, It is characterized in that The lower end of the metal shielding cover (6) passes downward over the lower edge of the terminal (5).

10. A pressure sensor according to claim 1, It is characterized in that The edge of the pressure joint (2) extends upward to form a metal cylindrical shell (21), the upper end of the metal cylindrical shell (21) is connected to the outer shell (1) and extends upward over the lower edge of the metal shielding cover (6).

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