A protective structure for air flow redirection of a gauge pressure sensor

Abstract

The present invention relates to the technical field of pressure sensors, and discloses a protective structure for airflow redirection for a gauge pressure sensor, including a gauge pressure sensor module, wherein a protective component is installed at the upper end of the gauge pressure sensor module. The protective structure for airflow redirection for a gauge pressure sensor forms a redirection airflow channel connected to a protective cavity through the cooperation of an upper cover and a dust cap, and the side wall airflow channel of the redirection airflow channel and the main airflow channel allow the gas to be redirected to enter the interior of the protective cavity. While achieving pressure balance, large particles of dust and liquid impurities from the outside cannot enter the airflow channel under the action of gravity. Even if some light impurities can enter the airflow channel, they adhere to the side wall of the airflow channel during the redirection process. The side wall airflow channels arranged in a circular array can ensure good airflow permeability, and large particles of impurities are isolated while maintaining pressure balance, thereby achieving the purpose of the joint action of pressure balance and protective structure.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure sensors, in particular to an airflow redirecting protection structure for a gauge pressure sensor. Background Art

[0002] Pressure sensors are divided into two types: absolute pressure and gauge pressure. Absolute pressure sensors sense the difference between pressure and a fixed reference pressure; gauge pressure sensors sense the difference between pressure and ambient pressure. Since ambient pressure is affected by factors such as temperature, humidity, and altitude, the reference pressure values ​​in different environments vary. To ensure the output accuracy of gauge pressure sensors, it is necessary to ensure that the ambient pressure is balanced with the internal pressure of the sensor.

[0003] In the prior art, while the internal pressure of a gauge pressure sensor is connected to the ambient pressure balance, harsh atmospheric environments such as liquids, moisture, and dust particles enter the MEMS (micro-electromechanical system) pressure sensor, affecting the measurement accuracy and durability of the gauge pressure sensor. This has the disadvantage of being unable to provide protection while achieving reference pressure balance of the sensor. Therefore, a protective structure with airflow deflection for a gauge pressure sensor is proposed. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the present invention provides a protective structure for air flow redirection for a gauge pressure sensor, which has the advantages of pressure balance and the combined effect of a protective structure. It solves the problem in the existing technology that while the internal pressure of the gauge pressure sensor is balanced with the ambient pressure, harsh atmospheric environment such as liquid, moisture and dust particles enter the interior of the pressure sensor, which will affect the measurement accuracy and durability of the gauge pressure sensor. There is a disadvantage that while achieving reference pressure balance of the sensor, protection cannot be provided.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned purpose of the combined effect of the pressure balance and the protective structure, the present invention provides the following technical solution: a protective structure for airflow redirection for a gauge pressure sensor, comprising a gauge pressure sensor module, a protective component mounted on the upper end of the gauge pressure sensor module, and a protective cavity formed between the gauge pressure sensor module and the protective component;

[0008] The protective component includes an upper cover and a dust cap, the upper end of the upper cover is mounted with a dust cap, and a deflecting airflow channel communicating with the protective cavity is formed between the upper cover and the dust cap; the deflecting airflow channel includes a side wall airflow channel and a main airflow channel that intersect vertically;

[0009] A waterproof and breathable membrane is provided above the main air flow channel.

[0010] Preferably, the upper cover includes a connecting tube and a second annular clip, the second annular clip is connected to the upper end of the connecting tube, the main air flow channel is arranged at the geometric center of the connecting tube, and the side wall air flow channel array is distributed on the second annular clip.

[0011] Preferably, the inner side wall of the dust cap is provided with a first annular buckle, and the inner top surface of the dust cap is provided with an array of bumps for limiting the assembly of the upper cover and the connecting pipe.

[0012] Preferably, an interference fit is formed between the first annular buckle and the second annular buckle.

[0013] Preferably, a groove is provided on the upper end surface of the connecting pipe for positioning and placing the waterproof breathable membrane.

[0014] Preferably, the upper plane of the waterproof breathable membrane and the upper end surface of the connecting pipe are located at the same horizontal plane to prevent blockage.

[0015] (3) Beneficial effects

[0016] Compared with the prior art, the present invention provides a protective structure for airflow redirection for a gauge pressure sensor, which has the following beneficial effects:

[0017] 1. This kind of gauge pressure sensor uses an airflow redirection protection structure, which forms a redirection airflow channel connected to the protection cavity between the upper cover and the dust cap. The side wall airflow channel of the redirection airflow channel and the main airflow channel allow the gas to be redirected 180 degrees to enter the interior of the protection cavity. While achieving pressure balance, large particles of dust and liquids and other impurities from the outside cannot enter the airflow channel under the action of gravity. Even if some light impurities can enter the airflow channel, they will adhere to the side walls of the airflow channel during the deflection process. The side wall airflow channels arranged in a circular array can ensure good airflow permeability, isolate large particles of impurities while maintaining pressure balance, thereby achieving the purpose of the joint action of pressure balance and protective structure.

[0018] 2. This gauge pressure sensor uses an airflow redirection protection structure that filters the airflow through the use of a waterproof breathable membrane to prevent dust and water from entering its protective cavity. The upper plane of the waterproof breathable membrane and the upper end surface of the connecting tube are located at the same horizontal plane, which can prevent the waterproof breathable membrane from forming an inner cavity that can accumulate dust or liquid, and prevent long-term accumulation of impurities from clogging the waterproof breathable membrane and affecting pressure balance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 An exploded view of an airflow redirection protection structure provided by an embodiment of the present invention.

[0020] Figure 2A cross-sectional view of an airflow redirection protection structure provided by an embodiment of the present invention.

[0021] Figure 3 A cross-sectional view of a dust cap of an airflow redirection protection structure provided by an embodiment of the present invention.

[0022] Figure 4 A diagram of the upper cover of the airflow redirection protection structure provided by an embodiment of the present invention.

[0023] Figure 5 Assembly diagram of the upper cover and waterproof breathable membrane of the airflow redirection protection structure provided by an embodiment of the present invention.

[0024] Figure 6 This is an application example of the airflow redirection protection structure provided by the embodiment of the present invention.

[0025] In the figure: 10 dust cap, 11 protrusion, 12 first annular buckle, 13 inner top surface, 30 waterproof breathable membrane, 31 upper plane of waterproof breathable membrane, 60 upper cover, 61 second annular buckle, 62 side wall air flow channel, 63 main air flow channel, 64 groove, 65 first plane, 66 upper end surface of connecting pipe, 70 connecting pipe, 80 air flow channel, 100 protective structure for air flow redirection, 200 gauge pressure sensor module, 300 protective cavity. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-6 , discloses an airflow deflection protection structure for a gauge pressure sensor provided by an embodiment of the present invention, which is composed of a dust cap 10, a waterproof breathable membrane 30 and an upper cover 60;

[0028] like Figure 6 and Figure 2 As shown, the airflow redirecting protective structure 100 is installed on the gauge pressure sensor module 200 to form a protective cavity 300 isolated from the outside world. The advantages of the airflow redirecting protective structure 100 are that the protective cavity 300 can not only maintain pressure balance through convection with the outside atmosphere, but also filter the airflow passing through the redirecting airflow channel. In addition, the waterproof and breathable membrane 30 is provided on the upper end surface of the connecting tube 70, which will not form liquid accumulation and cause blockage, forming a liquid seal, ensuring that the sensor has durable waterproof and dustproof properties and guaranteed accuracy.

[0029] like Figure 4As shown, the upper cover 60 is provided with a first plane 65, on which a connecting pipe 70 is provided, at least one main airflow channel 63 is provided at the geometric center of the connecting pipe 70, the upper end of the connecting pipe 70 is provided with a second annular buckle 61 that is engaged with the dust cap 10, the second annular buckle 61 at the upper end of the connecting pipe 70 is provided with sidewall airflow channels 62 arranged in a circumferential array, a redirecting airflow channel 80 communicating with the protective cavity 300 is formed between the upper cover 60 and the dust cap 10, the redirecting airflow channel 80 includes the sidewall airflow channel 62 and the main airflow channel 63, and a groove 64 to which the waterproof breathable membrane 30 is attached is provided on the upper end surface 66 of the connecting pipe;

[0030] like Figure 3 As shown, the inner side wall of the dust cap 10 is provided with an annular first annular buckle 12, and an interference fit is formed between the first annular buckle 12 and the second annular buckle 61. The inner top surface 13 of the dust cap 10 is provided with an array of protrusions 11; the number of protrusions 11 is four, which are used to match the side wall air flow channel 62 on the connecting pipe 70 for positioning;

[0031] like Figure 5 As shown, the waterproof breathable membrane 30 is concentrically arranged on the groove 64, and the upper plane 31 of the waterproof breathable membrane is located on the same horizontal plane as the upper end surface 66 of the connecting tube. When the upper plane 31 of the waterproof breathable membrane is lower than the upper end surface 66 of the connecting tube, an inner cavity that can accumulate dust or liquid is formed, thereby preventing impurities from accumulating for a long time and clogging the waterproof breathable membrane 30.

[0032] When using:

[0033] like Figure 1 As shown, in the protective structure 100 for airflow redirection of the present invention, the airflow channel 80 enters the internal cavity through the waterproof breathable membrane 30 after being redirected 180°. Large particles of dust and liquids and other impurities from the outside cannot enter the airflow channel 80 due to the action of gravity. Even if some light impurities can enter the airflow channel 80, they will adhere to the side walls of the airflow channel 80 during the redirection process. The sidewall airflow channels 62 arranged in a circular array can ensure good airflow permeability, which is conducive to maintaining pressure balance.

[0034] The gauge pressure sensor uses an airflow redirection protection structure, which forms a redirection airflow channel 80 connected to the protection cavity 300 between the upper cover 60 and the dust cap 10. The side wall airflow channel 62 of the redirection airflow channel 80 and the main airflow channel 63 allow the gas to be redirected 180 degrees and enter the interior of the protection cavity 300. While achieving pressure balance, large particles of dust and liquids and other impurities from the outside cannot enter the airflow channel 80 under the action of gravity. Even if some light impurities can enter the airflow channel 80, they adhere to the side walls of the airflow channel 80 during the redirection process. The side wall airflow channels 62 arranged in a circular array can ensure good airflow permeability, isolate large particles of impurities while maintaining pressure balance, thereby achieving the purpose of the combined effect of pressure balance and protection structure, solving the problem that the internal pressure of the gauge pressure sensor in the prior art is connected to the ambient pressure balance, while the harsh atmospheric environment such as liquid, moisture and dust particles enter the interior of the pressure sensor, which will affect the measurement accuracy and durability of the gauge pressure sensor, and there is a disadvantage of not being able to provide protection while achieving the reference pressure balance of the sensor.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A protective structure for airflow deflection for a gauge pressure sensor, characterized in that: It comprises a gauge pressure sensor module (200), a protective component (100) being installed at the upper end of the gauge pressure sensor module (200), and a protective cavity (300) being formed between the gauge pressure sensor module (200) and the protective component (100); The protective component (100) comprises an upper cover (60) and a dust cap (10); the dust cap (10) is installed at the upper end of the upper cover (60); a deflecting airflow channel (80) communicating with the protective cavity (300) is formed between the upper cover (60) and the dust cap (10); the deflecting airflow channel (80) comprises a side wall airflow channel (62) and a main airflow channel (63) that intersect vertically; A waterproof and breathable membrane (30) is provided above the main air flow channel (63); The upper cover (60) comprises a connecting tube (70) and a second annular buckle (61), wherein the second annular buckle (61) is connected to the upper end of the connecting tube (70), the main air flow channel (63) is arranged at the geometric center of the connecting tube (70), and the side wall air flow channels (62) are distributed in an array on the second annular buckle (61); The upper end surface of the connecting pipe (70) is provided with a groove (64) for positioning and placing the waterproof breathable membrane (30); The upper plane of the waterproof and breathable membrane (30) and the upper end surface of the connecting pipe (70) are located at the same horizontal plane to prevent blockage.

2. The airflow redirection protection structure for a gauge pressure sensor according to claim 1, characterized in that: The inner side wall of the dust cap (10) is provided with a first annular buckle (12), and the inner top surface of the dust cap (10) is provided with an array of protrusions (11) for assembling and limiting the upper cover (60) and the connecting pipe (70).

3. The airflow redirection protection structure for a gauge pressure sensor according to claim 2, characterized in that: An interference fit is formed between the first annular buckle (12) and the second annular buckle (61).

Images