Pressure sensor and pressure detection device

Abstract

The utility model provides a pressure sensor and a pressure detection device, and relates to the technical field of pressure sensors. In the pressure sensor, a pressure interface main body extends out of a shell; a pressure channel is formed in the pressure connector body, and a deformation diaphragm is formed at one end of the pressure channel. And a pressure sensitive element is arranged on one side of the deformation diaphragm. The circuit board is arranged in the shell; the circuit board comprises a first board part, a second board part and a flexible connecting part which are integrally formed. The first plate part is electrically connected with the pressure sensitive element and is parallel to the pressure sensitive element. An included angle is formed between the first plate part and the second plate part. The flexible connecting part is connected between the first plate part and the second plate part. The output end assembly is used for outputting electric signals. The pressure detection device provided by the utility model adopts the pressure sensor. The pressure sensor and the pressure detection device provided by the utility model can improve the problem that the pressure sensor in the prior art is large in size and difficult to process.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure sensors, in particular to a pressure sensor and a pressure detection device. Background Art

[0002] A pressure sensor is a Wheatstone bridge circuit made of multiple resistors fabricated using semiconductor technology. These resistors are mounted on a deformable diaphragm. The diaphragm is strained by the pressure of the pressure medium being measured. This strain causes the resistance of the multiple resistors to change, and consequently, the output of the Wheatstone bridge circuit. This output is then processed by a conditioning circuit to form a specific output signal. This is the basic principle of this pressure sensor.

[0003] However, in the prior art, when the circuit board is placed horizontally, the overall volume of the pressure sensor increases; and when the circuit board is placed vertically, the structure of the pressure sensor changes, which greatly increases the difficulty of processing. Utility Model Content

[0004] The technical problem solved by the utility model is how to improve the problem in the prior art that the pressure sensor is large in size and difficult to process.

[0005] The embodiment of the present utility model can be implemented as follows:

[0006] The utility model provides a pressure sensor, comprising:

[0007] case;

[0008] A pressure interface body is disposed inside the housing and partially extends out of the housing; a pressure channel is defined on the pressure interface body, and a deformable diaphragm is formed at one end of the pressure channel; a pressure sensitive element is provided on a side of the deformable diaphragm away from the pressure channel;

[0009] A circuit board is disposed inside the housing; the circuit board includes a first board portion, a second board portion, and a flexible connecting portion; the first board portion is electrically connected to the pressure sensitive element and is parallel to the pressure sensitive element; the first board portion and the second board portion are arranged at an angle; the flexible connecting portion is connected between the first board portion and the second board portion; the first board portion, the second board portion, and the flexible connecting portion are integrally formed;

[0010] The output end component is arranged inside the shell and partially extends out of the shell; the output end component is electrically connected to the second board portion and is used to output electrical signals.

[0011] The advantages of the pressure sensor provided by the utility model over the prior art include:

[0012] In this pressure sensor, since the circuit board uses a flexible connection portion to connect the first and second plate portions, during the assembly process of the circuit board and the pressure-sensitive element, the electrical connection between the first plate portion and the pressure-sensitive element can be completed while the circuit board is generally horizontal, and then the second plate portion can be vertically set by bending the flexible connection portion. While maintaining the deformable diaphragm in a horizontal setting, the second plate portion of the circuit board is set vertically. On the one hand, this helps to reduce the overall volume of the pressure sensor. On the other hand, it does not require changing the setting form of the pressure channel and the deformable diaphragm, thereby reducing the processing difficulty of the pressure channel and the deformable diaphragm. Based on this, the pressure sensor provided by the utility model can improve the problem of the large size and processing difficulty of the pressure sensor in the prior art.

[0013] Optionally, the flexible connection portion is connected to one side edge of the first plate portion, and the flexible connection portion is connected to one side edge of the second plate portion.

[0014] Optionally, the flexible connection portion includes a first flexible portion and a second flexible portion, the first flexible portion and the second flexible portion are both connected between the first plate portion and the second plate portion, and the first flexible portion and the second flexible portion are arranged in parallel and at intervals.

[0015] Optionally, the pressure sensor also includes a mounting bracket; the mounting bracket includes a first body, a second body and a partition; the first body and the second body are respectively arranged on opposite sides of the partition; the pressure interface body is connected to the first body, the second plate portion is connected to the second body, and the first plate portion is arranged on the side of the partition close to the second body; a through hole is opened on the partition, and the through hole is used for the wire connecting the pressure sensitive element and the first plate portion to pass through.

[0016] Optionally, the first body is bent into an arc shape, and the first body is wrapped around the outer circumference of the pressure interface body.

[0017] Optionally, the second main body is bent into an arc shape, and a clamping portion is protruded from both sides of the second main body; a clamping slot is opened on both sides of the second plate portion; and the two clamping portions are respectively clamped into the two clamping slots.

[0018] Optionally, a side of the second body away from the partition is wrapped around the outer periphery of the output end component.

[0019] Optionally, a mounting groove is provided on the output end assembly, and the second plate portion is embedded in the mounting groove.

[0020] Optionally, the shell is cylindrical, and one end of the shell is wrapped around the output end assembly, and the other end is wrapped around the pressure interface body.

[0021] A pressure detection device comprises the above-mentioned pressure sensor.

[0022] The pressure detection device provided by the present invention adopts the above-mentioned pressure sensor. The beneficial effects of the pressure detection device relative to the prior art are the same as the beneficial effects of the above-mentioned pressure sensor relative to the prior art, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic diagram of the explosion structure of the pressure sensor provided in an embodiment of the present application;

[0025] Figure 2 A cross-sectional view of a pressure sensor provided in an embodiment of the present application;

[0026] Figure 3 This is a partial structural diagram of the pressure sensor provided in an embodiment of the present application.

[0027] Icon: 10-pressure sensor; 100-housing; 200-pressure interface body; 210-pressure channel; 220-deformable diaphragm; 230-pressure sensitive element; 300-circuit board; 310-first plate portion; 320-second plate portion; 321-card slot; 330-flexible connecting portion; 331-first flexible portion; 332-second flexible portion; 400-output end assembly; 410-mounting slot; 500-mounting bracket; 510-first body; 520-second body; 521-card connecting portion; 530-partition; 531-through hole. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0032] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0033] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention can be combined with each other.

[0034] See also Figure 1 In this embodiment, a pressure sensor 10 is provided. The pressure sensor 10 can be used to detect the pressure of a fluid in real time. The pressure sensor 10 in this embodiment can improve the problem of the pressure sensor 10 in the prior art being large in size and difficult to manufacture.

[0035] In this embodiment, please refer to Figure 1 、 Figure 2 and Figure 3The pressure sensor 10 includes a housing 100, a pressure interface body 200, a circuit board 300, and an output end assembly 400. The pressure interface body 200 is disposed within the housing 100 and partially extends out of the housing 100. A pressure channel 210 is defined on the pressure interface body 200, and a deformable diaphragm 220 is formed at one end of the pressure channel 210. A pressure sensitive element 230 is provided on the side of the deformable diaphragm 220 away from the pressure channel 210. The circuit board 300 is disposed within the housing 100. The circuit board 300 includes a first plate portion 310, a second plate portion 320, and a flexible connection portion 330. The first plate portion 310 is electrically connected to the pressure sensitive element 230 and is parallel to the pressure sensitive element 230. The first plate portion 310 and the second plate portion 320 are disposed at an angle. The flexible connection portion 330 is connected between the first plate portion 310 and the second plate portion 320. The first plate portion 310, the second plate portion 320, and the flexible connection portion 330 are integrally formed. The output end assembly 400 is disposed inside the housing 100 and partially extends out of the housing 100 ; the output end assembly 400 is electrically connected to the second board portion 320 and is used to output electrical signals.

[0036] When the pressure sensor 10 is placed in a fluid for pressure detection, the fluid enters the pressure channel 210 and directly acts on the deformable diaphragm 220. The pressure exerted by the fluid causes the deformable diaphragm 220 to produce a slight deformation. At this time, the pressure sensitive element 230 can form an electrical signal based on the deformation amount of the deformable diaphragm 220. The electrical signal is transmitted to the circuit board 300 for processing and then output through the output end component 400, thereby completing the detection of the fluid pressure.

[0037] As described above, in the pressure sensor 10, because the circuit board 300 utilizes a flexible connection portion 330 to connect the first plate portion 310 and the second plate portion 320, during the assembly process of the circuit board 300 and the pressure sensitive element 230, the electrical connection between the first plate portion 310 and the pressure sensitive element 230 can be completed while the circuit board 300 is generally horizontal, and then the second plate portion 320 can be vertically arranged by bending the flexible connection portion 330. While maintaining the deformable diaphragm 220 in a horizontal position, the second plate portion 320 of the circuit board 300 is arranged vertically. This, on the one hand, helps to reduce the overall volume of the pressure sensor 10, and on the other hand, does not require changing the arrangement of the pressure channel 210 and the deformable diaphragm 220, thereby reducing the difficulty in processing the pressure channel 210 and the deformable diaphragm 220. Based on this, the pressure sensor 10 provided by the present invention can improve the problem of the pressure sensor 10 in the prior art being large in size and difficult to process.

[0038] It is worth noting that, precisely because the first plate portion 310, the second plate portion 320, and the flexible connection portion 330 are integrally formed, the first plate portion 310 and the pressure sensitive element 230 can be directly wired together during assembly of the circuit board 300. After the wiring is complete, the second plate portion 320 can be directly assembled to the designated position simply by bending the flexible connection portion 330. Furthermore, precisely because the flexible connection portion 330 is flexible and can be bent arbitrarily, it is possible to prevent the first plate portion 310 from interfering with the assembly of the second plate portion 320. This allows the circuit board 300 to be arranged partially horizontally and partially vertically without adding excessive process steps, thereby reducing assembly difficulty and substantially increasing assembly process costs, while meeting the need to reduce the size of the pressure sensor 10.

[0039] Optionally, in this embodiment, the flexible connector 330 is connected to one side of the first plate portion 310, and the flexible connector 330 is connected to one side of the second plate portion 320. Therefore, when assembling the circuit board 300, with the first plate portion 310, second plate portion 320, and flexible connector 330 unfolded, the circuit board 300 can be considered to be laid flat. At this point, the first plate portion 310 and the pressure-sensitive element 230 can be wire-tied. After the wire-tied assembly is complete, the flexible connector 330 can be bent to install the second plate portion 320 in the desired position, completing the assembly of the circuit board 300.

[0040] Connecting the flexible connector 330 to the side of the first plate 310 can prevent the flexible connector 330 from interfering with the binding wire during the wiring assembly of the first plate 310 and the pressure sensitive element 230, facilitating faster wiring and improving assembly efficiency. Furthermore, the flexible connector 330 can be prevented from interfering with the binding wire accuracy.

[0041] Optionally, in this embodiment, the flexible connection portion 330 includes a first flexible portion 331 and a second flexible portion 332. Both the first flexible portion 331 and the second flexible portion 332 are connected between the first plate portion 310 and the second plate portion 320, and the first flexible portion 331 and the second flexible portion 332 are arranged in parallel and spaced apart. This reduces the cost of installing the flexible connection portion 330. Furthermore, when the first flexible portion 331 and the second flexible portion 332 are spaced apart, even if the first plate portion 310 and the second plate portion 320 twist relative to each other, the first flexible portion 331 and the second flexible portion 332 will not be damaged. This improves the relative freedom of movement of the first plate portion 310 and the second plate portion 320, facilitates assembly of the first plate portion 310 and the second plate portion 320, reduces the difficulty of assembling the circuit board 300, and improves the assembly efficiency of the circuit board 300.

[0042] Of course, in other embodiments of the present application, the flexible connection portion 330 may also be formed by an integral flexible structure.

[0043] In this embodiment, the pressure sensor 10 further includes a mounting bracket 500. The mounting bracket 500 includes a first body 510, a second body 520, and a partition 530. The first body 510 and the second body 520 are disposed on opposite sides of the partition 530. The pressure interface body 200 is connected to the first body 510, and the second plate portion 320 is connected to the second body 520. The first plate portion 310 is disposed on a side of the partition 530 proximal to the second body 520. The partition 530 includes a through hole 531 for passing a wire connecting the pressure sensitive element 230 and the first plate portion 310. The first body 510 supports the pressure interface body 200, while the second body 520 supports the second plate portion 320. This allows the circuit board 300 and the pressure interface body 200 to form a single unit, facilitating assembly of the pressure sensor 10 within the housing 100. Furthermore, this improves the overall stability of the circuit board 300 relative to the pressure interface body 200.

[0044] To fit the pressure interface body 200, the first body 510 is optionally bent into an arc shape, wrapping around the outer circumference of the pressure interface body 200. Bending the first body 510 into an arc shape facilitates stable assembly of the first body 510 and the pressure interface body 200, thereby improving the connection stability between the first body 510 and the pressure interface body 200.

[0045] Alternatively, the second body 520 can be curved into an arc shape, with protruding engaging portions 521 formed on either side of the second body 520. The second plate portion 320 has engaging slots 321 formed on either side of the second body 520. The two engaging portions 521 engage with the two engaging slots 321, respectively. The coordination between the engaging portions 521 and the engaging slots 321 enhances the connection stability between the second plate portion 320 and the second body 520. Curving the second body 520 into an arc shape also increases the distance between the second body 520 and the second plate portion 320, facilitating heat dissipation from the second plate portion 320.

[0046] Furthermore, to facilitate heat dissipation from the circuit board 300, the second body 520 is provided with a plurality of hollow holes (not shown) to facilitate airflow around the circuit board 300, thereby facilitating heat dissipation. This also reduces the overall mass of the mounting bracket 500, and thereby the overall mass of the pressure sensor 10.

[0047] Furthermore, to enhance the overall stability of the pressure sensor 10, the side of the second body 520 away from the partition 530 wraps around the periphery of the output assembly 400. This allows the output assembly 400, circuit board 300, mounting bracket 500, and pressure interface body 200 to form a single unit, enhancing the relative positional stability of the output assembly 400, circuit board 300, mounting bracket 500, and pressure interface body 200.

[0048] In this embodiment, the output assembly 400 is provided with a mounting slot 410, into which the second plate portion 320 is inserted. Inserting the second plate portion 320 into the mounting slot 410 improves the overall stability of the second plate portion 320 relative to the output assembly 400, thereby enhancing the stability of the second plate portion 320 connected to the designated circuit of the output assembly 400. Furthermore, additional connections can be added to the second plate portion 320, further improving its overall stability and preventing it from moving relative to the first plate portion 310, thereby preventing damage to the flexible connector 330.

[0049] In this embodiment, the housing 100 is cylindrical, and one end of the housing 100 is wrapped around the output end assembly 400 , and the other end is wrapped around the pressure interface body 200 .

[0050] In summary, in the pressure sensor 10 and pressure detection device provided in this embodiment, since the circuit board 300 uses a flexible connection portion 330 to connect the first plate portion 310 and the second plate portion 320, during the assembly process of the circuit board 300 and the pressure sensitive element 230, the electrical connection between the first plate portion 310 and the pressure sensitive element 230 can be completed while the circuit board 300 is generally horizontal, and then the second plate portion 320 is vertically arranged by bending the flexible connection portion 330. While maintaining the deformable diaphragm 220 in a horizontal position, the second plate portion 320 of the circuit board 300 is arranged vertically. On the one hand, this helps to reduce the overall volume of the pressure sensor 10. On the other hand, it does not require changing the arrangement of the pressure channel 210 and the deformable diaphragm 220, thereby reducing the processing difficulty of the pressure channel 210 and the deformable diaphragm 220. Based on this, the pressure sensor 10 provided by the utility model can improve the problem of the pressure sensor 10 in the prior art being large in size and difficult to process. Because the first plate portion 310, the second plate portion 320, and the flexible connection portion 330 are integrally formed, the first plate portion 310 and the pressure-sensitive element 230 can be directly wired together during assembly of the circuit board 300. After this wiring is complete, the second plate portion 320 can be directly assembled to the designated position simply by utilizing the flexible bending of the flexible connection portion 330. Furthermore, the flexible connection portion 330 is flexible and can be bent arbitrarily, preventing the first plate portion 310 from interfering with the assembly of the second plate portion 320. This allows the circuit board 300 to be arranged partially horizontally and partially vertically without adding excessive process steps, thus reducing assembly difficulty and substantially increasing assembly process costs while meeting the need to reduce the size of the pressure sensor 10.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A pressure sensor, characterized in that: include: Housing (100); A pressure interface body (200) is provided inside the housing (100) and partially extends out of the housing (100); a pressure channel (210) is provided on the pressure interface body (200), and a deformable diaphragm (220) is formed at one end of the pressure channel (210); a pressure sensitive element (230) is provided on a side of the deformable diaphragm (220) away from the pressure channel (210); A circuit board (300) is provided inside the housing (100); the circuit board (300) comprises a first board portion (310), a second board portion (320) and a flexible connecting portion (330); the first board portion (310) is electrically connected to the pressure sensitive element (230), and the first board portion (310) is parallel to the pressure sensitive element (230); the first board portion (310) and the second board portion (320) are arranged at an angle; the flexible connecting portion (330) is connected between the first board portion (310) and the second board portion (320); the first board portion (310), the second board portion (320) and the flexible connecting portion (330) are integrally formed; An output end component (400) is arranged inside the housing (100) and partially extends out of the housing (100); the output end component (400) is electrically connected to the second plate portion (320) and is used to output electrical signals.

2. The pressure sensor according to claim 1, wherein The flexible connection portion (330) is connected to one side edge of the first plate portion (310), and the flexible connection portion (330) is connected to one side edge of the second plate portion (320).

3. The pressure sensor according to claim 1, wherein The flexible connecting portion (330) includes a first flexible portion (331) and a second flexible portion (332), wherein the first flexible portion (331) and the second flexible portion (332) are both connected between the first plate portion (310) and the second plate portion (320), and the first flexible portion (331) and the second flexible portion (332) are arranged in parallel and at intervals.

4. The pressure sensor according to claim 1, wherein The pressure sensor (10) further includes a mounting bracket (500); the mounting bracket (500) includes a first body (510), a second body (520) and a partition (530); the first body (510) and the second body (520) are respectively arranged on opposite sides of the partition (530); the pressure interface body (200) is connected to the first body (510), the second plate portion (320) is connected to the second body (520), and the first plate portion (310) is arranged on a side of the partition (530) close to the second body (520); a through hole (531) is opened on the partition (530), and the through hole (531) is used for allowing a wire connecting the pressure sensitive element (230) and the first plate portion (310) to pass through.

5. The pressure sensor according to claim 4, characterized in that The first body (510) is bent into an arc shape, and the first body (510) is wrapped around the outer circumference of the pressure interface body (200).

6. The pressure sensor according to claim 4, characterized in that The second main body (520) is bent into an arc shape, and a clamping portion (521) is protruded on both sides of the second main body (520); a clamping groove (321) is opened on both sides of the second plate portion (320); and the two clamping portions (521) are respectively clamped into the two clamping grooves (321).

7. The pressure sensor according to claim 6, characterized in that The side of the second body (520) away from the partition (530) is wrapped around the outer periphery of the output end component (400).

8. The pressure sensor according to claim 1, wherein The output end assembly (400) is provided with a mounting groove (410), and the second plate portion (320) is embedded in the mounting groove (410).

9. The pressure sensor according to claim 1, wherein The housing (100) is cylindrical, and one end of the housing (100) is wrapped around the output end assembly (400), and the other end is wrapped around the pressure interface body (200).

10. A pressure detection device, characterized in that: The method comprises a pressure sensor (10) as claimed in any one of claims 1 to 9.

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