Pressure sensor with buffer structure

Abstract

The utility model discloses a pressure sensor with a buffer structure, which comprises a filler neck, a bracket, a pressure core body, a circuit board, a shell and an electric connector, and is characterized in that a buffer gasket is welded at the outlet end of a pressure inlet hole of the filler neck, and a buffer groove is radially arranged on the pressure bearing surface of the buffer gasket, which is opposite to the pressure inlet hole; and an axially arranged vent hole is formed in the buffer groove. The sensor provided by the utility model has buffering and pressure relief capabilities on instantaneous pressure, has the advantages of few parts, low processing difficulty and good sealing performance, and can ensure the reliability of the sensor. According to the pressure sensor, the height and the weight can be effectively reduced, the buffer gasket can reduce the instantaneous pressure of a medium, and the pressure core body is protected; all parts of the sensor are connected mainly in a laser welding mode, the welding penetration of the parts is controlled by adjusting welding parameters, and the reliability of connection is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, specifically a pressure sensor with a buffer structure. Background Technology

[0002] Sensors are mostly selected based on the requirements of different media within different measurement ranges. The pressure core of small-range sensors generally cannot withstand instantaneous large overload pressures; otherwise, it will cause mechanical damage to the pressure core, leading to chip deformation and failure. Therefore, for small-range pressure sensors operating under overload transient pressure conditions, buffering of the measured medium is necessary to protect the pressure core and ensure its reliability.

[0003] In the aerospace industry, pressure sensors are widely used for pressure measurement. To ensure product accuracy when specific pressure requirements are met, pressure cores with the smallest possible range must be selected. However, when measuring pressure in areas such as engine compartments or pressure relief vents, the transient pressure on the pressure sensor can be significantly higher, exceeding the actual sensor range by several times and even more than twice the burst pressure of the pressure core, leading to sensor failure. Therefore, to ensure the sensor's measurement accuracy and transient pressure resistance, appropriate buffer structures must be incorporated into the pressure sensor to reduce transient pressure and ensure long-term stable operation.

[0004] The most common buffering method on the market is to add buffer screws. This solution has the following problems: (1) The buffer screws have requirements on the height of the sensor. If the sensor's external dimensions do not meet the requirements, the design cannot be carried out; (2) The addition of buffer screws will cause a large amount of space to be occupied inside the sensor, which will increase the product quality while occupying the space of the circuit board layout; (3) The buffer screws are fixed by thread installation. Long-term vibration conditions may cause the threads to loosen; (4) In order to ensure the threads are tight, adhesive needs to be added for fixing, which may cause the generation of foreign matter and media compatibility problems. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the prior art by providing a pressure sensor with a buffer structure that has the ability to buffer and relieve instantaneous pressure.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A pressure sensor with a buffer structure includes a connector, a bracket, a pressure core, a circuit board, a housing, and an electrical connector. The sensor is characterized in that: a buffer pad is welded to the outlet end of the pressure inlet of the connector, a radially arranged buffer groove is provided on the pressure-bearing surface of the buffer pad facing the pressure inlet, and an axially arranged vent hole is provided on the buffer groove.

[0008] The distance between the vent hole and the central axis of the buffer pad is more than twice the distance between the vent hole and the edge of the buffer pad.

[0009] The radius of the vent hole is not less than the radius of the buffer groove.

[0010] The buffer groove is a cross-shaped milled groove, and the ratio of the radius of the buffer groove to the radius of the buffer pad is 1:10 to 20.

[0011] The outlet end of the pressure inlet is flared, and the inner diameter of the outlet end face of the pressure inlet is not less than twice the inner diameter of the inlet end face of the pressure inlet.

[0012] The connector is provided with a groove for connecting the pressure inlet hole, and a bracket containing the pressure core is installed in the groove, with the adjacent end faces of the connector and the bracket welded together.

[0013] The pressure core is welded into the pre-set mounting cavity of the bracket.

[0014] The circuit board is fixed to the bracket with screws and is connected to the pressure core through wiring.

[0015] The outer shell is welded to the bracket and has threaded mounting holes for installing electrical connectors.

[0016] The electrical connector is threaded to the housing and then fixed with screws, and the electrical connector is connected to the circuit board via wires.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] This utility model's pressure sensor effectively reduces the sensor's height and weight by using a buffer pad. The core structure of the sensor consists of a buffer pad and a support. The medium is transmitted to the buffer pad through the pressure inlet of the connector, where it is buffered to reduce the instantaneous pressure of the medium and protect the pressure core. The various components of the sensor are mainly connected by laser welding. The welding depth of the parts is controlled by adjusting the welding parameters to ensure the reliability of the connection. Compared with the design of buffer screws, there are no issues of loosening due to vibration or medium compatibility. Attached Figure Description

[0019] Appendix Figure 1 A schematic diagram of the structure of the buffer pad provided by this utility model;

[0020] Appendix Figure 2 This is a schematic diagram of the pressure sensor with a buffer structure provided by this utility model.

[0021] Wherein: 1—connector nozzle; 11—pressure inlet; 12—embedded groove; 2—buffer pad; 21—buffer groove; 22—vent hole; 3—bracket; 4—pressure core; 5—circuit board; 6—outer shell; 7—electrical connector. Detailed Implementation

[0022] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0023] The terms “a,” “one,” “the,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended meaning of inclusion and that other elements / components / etc. may exist in addition to the listed elements / components / etc.

[0024] like Figure 1-2 As shown: A pressure sensor with a buffer structure includes a connector 1, a bracket 3, a pressure core 4, a circuit board 5, a housing 6, and an electrical connector 7. The connector 1 includes a pressure inlet 11 and an embedding groove 12 communicating with the pressure inlet 11. The bracket 3, which houses the pressure core 4, is installed in the embedding groove 12, and the adjacent end faces of the connector 1 and the bracket 3 are welded together. The pressure core 4 is welded in a pre-set mounting cavity of the bracket 3. The circuit board 5 is fixed to the bracket 3 with screws and is connected to the pressure core 4 via a wire. The housing 6 is welded to the bracket 3 and has a threaded mounting hole for mounting the electrical connector 7. The electrical connector 7 is threaded to the housing 6 and then fixed with screws. The electrical connector 7 is connected to the circuit board 5 via a wire.

[0025] The pressure sensor's inlet port 11 has a flared outlet. The inner diameter of the outlet end face of the inlet port 11 is not less than twice the inner diameter of the inlet end face. A buffer pad 2 is welded to the outlet end of the inlet port 11 of the connector 1. A radially arranged buffer groove 21 is provided on the pressure-bearing surface of the buffer pad 2 facing the inlet port 11. An axially arranged vent hole 22 is provided on the buffer groove 21. The distance between the vent hole 22 and the central axis of the buffer pad 2 is more than twice the distance between the vent hole 22 and the edge of the buffer pad 2, and the radius of the vent hole 22 is not less than the radius of the buffer groove 21. Furthermore, the buffer groove 21 is a cross-shaped milled groove, and the ratio of the radius of the buffer groove 21 to the radius of the buffer pad 2 is 1:10 to 20. The ratio of the thickness of the buffer pad 2 to the diameter of the buffer pad 2 is 1:10 to 20. Example

[0026] like Figure 1-2 The pressure sensor shown includes a connector 1, a buffer pad 2, a bracket 3, a pressure core 4, a circuit board 5, a housing 6, and an electrical connector 7. A hexagonal shape with 32mm flatness is machined on the outer surface of the connector 1 to facilitate sensor installation, and an M12 external thread is machined as the mounting thread. The buffer pad 2 has a radially arranged cross-shaped buffer groove 21 passing through an axis, and an axially arranged vent hole 22 on the buffer groove 21. The buffer pad 2 uses the buffer groove 21 to convert the axial pressure source into radial pressure, and then converts it back into axial pressure through the vent hole 22, thus providing a buffering effect. The buffer pad 2 and the connector 1 are connected by laser welding to ensure reliable connection. The bracket 3 is also connected to the connector 1 by laser welding. The pressure core 4 has a pre-set mounting bracket. The cavity is fitted with an M2 threaded hole at the top; the pressure core 4 is placed in the pre-set mounting cavity of the bracket 3 and fixed to the bracket 3 by laser welding; the circuit board 5 is fixed to the threaded hole on the bracket 3 with screws and connected to the pressure core 4 to transmit sensor signals; the outer shell 6 is laser welded to the bracket 3 to protect the assembly consisting of the bracket 3 and the pressure core 4, and is provided with a threaded mounting hole for mounting the electrical connector 7; after the electrical connector 7 is threadedly connected to the outer shell 6, it is reinforced with screws and connected to the circuit board 5 through wires to provide power and signal output to the entire assembly.

[0027] The pressure sensor of this utility model effectively reduces the height and weight of the sensor by using a buffer pad 2. The core structure of the sensor is the buffer pad 2 and the bracket 3. The medium is transmitted to the buffer pad 2 through the pressure inlet 11 of the connector 1. The instantaneous pressure of the medium is reduced by buffering, thus protecting the pressure core 4. The components of the sensor are mainly connected by laser welding. The welding depth of the parts is controlled by adjusting the welding parameters to ensure the reliability of the connection. Compared with the design of buffer screws, there are no problems of loosening in the vibration environment or medium compatibility.

[0028] In this embodiment of the invention, the term "multiple" refers to two or more, unless otherwise explicitly defined. The terms "install," "connect," and "fix" should be interpreted broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention based on the specific circumstances.

[0029] In the description of the embodiments of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0030] In this specification, the terms "an embodiment," "a preferred embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The above embodiments are only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed by this utility model shall fall within the scope of protection of this utility model. Technologies not covered by this utility model can be implemented by existing technologies.

Claims

1. A pressure sensor with a cushioning structure, comprising a connection nipple (1), a bracket (3), a pressure core (4), a circuit board (5), a housing (6), an electrical connector (7), characterized in that: The outlet end of the inlet hole (11) of the connecting nozzle (1) is welded with a buffer gasket (2), the buffer gasket (2) is provided with a radial buffer groove (21) on the pressure bearing surface of the buffer gasket (2) opposite to the inlet hole (11), and the buffer groove (21) is provided with an axial air hole (22).

2. The pressure sensor with a buffering structure according to claim 1, wherein: The distance between the air hole (22) and the central axis of the buffer gasket (2) is more than twice the distance between the air hole (22) and the edge of the buffer gasket (2).

3. The pressure sensor with a buffering structure according to claim 1, wherein: The radius of the air hole (22) is not less than the radius of the buffer groove (21).

4. The pressure sensor with a buffering structure according to claim 1, wherein: The buffer groove (21) is a cross-shaped milled groove, and the ratio of the radius of the buffer groove (21) to the radius of the buffer gasket (2) is 1:10-20.

5. The pressure sensor with a buffering structure according to claim 1, wherein: The outlet end of the inlet hole (11) is in a horn mouth state, and the inner diameter of the outlet end surface of the inlet hole (11) is not less than twice the inner diameter of the inlet end surface of the inlet hole (11).

6. The pressure sensor with a buffering structure according to any one of claims 1-5, wherein: The connecting nozzle (1) is provided with an embedded groove (12) communicating with the inlet hole (11), a support (3) provided with a pressure core (4) is installed in the embedded groove (12), and the abutting end surfaces of the connecting nozzle (1) and the support (3) are welded.

7. The pressure sensor with a buffering structure according to any one of claims 1-5, wherein: The pressure core (4) is welded in a preset installation cavity of the support (3).

8. The pressure sensor with a buffering structure according to any one of claims 1-5, wherein: The circuit board (5) is fixed on the support (3) by screws, and the circuit board (5) is connected with the pressure core (4) by wires.

9. The pressure sensor with a buffering structure according to any one of claims 1-5, wherein: The shell (6) is welded on the support (3), and the shell (6) is provided with a threaded mounting hole for mounting an electric connector (7).

10. The pressure sensor with a buffering structure according to any one of claims 1-5, wherein: The electric connector (7) is screwed with the shell (6) and fixed by screws, and the electric connector (7) is connected with the circuit board (5) by wires.

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