CN211576454U

CN211576454U - Gauge pressure is protective structure of air current diversion for sensor

Info

Publication number: CN211576454U
Application number: CN201922036019.2U
Authority: CN
Inventors: 王小平; 李凡亮; 吴登峰; 曹万
Original assignee: Wuhan Finemems Inc
Current assignee: Wuhan Finemems Inc
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-09-25
Anticipated expiration: 2029-11-22

Abstract

The utility model relates to a pressure sensor technical field just discloses a protective structure of air current diversion for gauge pressure sensor, including gauge pressure sensor module, protective part is installed to the upper end of gauge pressure sensor module. This kind of gauge pressure sensor is with protective structure of air current diversion, use through the cooperation that forms the diversion airflow channel who communicates with the protection cavity between upper cover and the dust cap, diversion airflow channel lateral wall airflow channel and main airflow channel make gas by the diversion inside that enters into the protection cavity, when realizing pressure balance, impurity such as external large granule dust and liquid can not get into airflow channel under the action of gravity, even partial light impurity can get into airflow channel, depend on the lateral wall at airflow channel at the diversion in-process, good air current trafficability characteristic can be ensured to the lateral wall airflow channel that circumference array arranged, isolated large granule impurity when keeping pressure balance, thereby realized pressure balance and protective structure combined action's purpose.

Description

Gauge pressure is protective structure of air current diversion for sensor

Technical Field

The utility model relates to a pressure sensor technical field specifically is a protective structure of air current diversion for gauge pressure sensor.

Background

The pressure sensor is divided into an absolute pressure type and a gauge pressure type, and the absolute pressure sensor senses the difference value between the pressure and a fixed reference pressure; the gauge pressure sensor is a difference value between sensing pressure and environmental pressure, and because the environmental pressure value is influenced by factors such as temperature, humidity and altitude, reference pressure values under different environments are different, and in order to ensure the output accuracy of the gauge pressure type sensor, the balance between the environmental pressure and the internal pressure of the sensor must be ensured.

In the prior art, when the internal pressure of a gauge pressure sensor is in balance communication with the environmental pressure, a severe atmospheric environment such as liquid, moisture, dust particles and the like enters the interior of an MEMS (micro electro mechanical system) pressure sensor, which affects the measurement accuracy and durability of the pressure sensor, and the gauge pressure sensor has the defect that the gauge pressure sensor cannot be protected while realizing the balance of reference pressure of the sensor, so that the protective structure for changing the direction of air flow for the gauge pressure sensor is provided.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

To prior art not enough, the utility model provides a gauge pressure is protective structure of air current diversion for sensor, possess advantages such as pressure balance and protective structure combined action, when having solved gauge pressure sensor's among the prior art internal pressure and environmental pressure balance and being linked together, abominable atmospheric environment is for example liquid, moisture and dust particle etc. enter into pressure sensor's inside, can produce the influence to gauge pressure sensor's measurement accuracy and durability, there is when realizing sensor reference pressure balance, can not carry out the problem of the shortcoming of protection.

(II) technical scheme

For the purpose that realizes above-mentioned pressure balance and protective structure combined action, this practicality provides following technical scheme: a gauge pressure sensor is with protection structure of air current diversion, including gauge pressure sensor die set, the upper end of the said gauge pressure sensor die set is fitted with the protective member, form the protective cavity between protective member and the said gauge pressure sensor die set;

the protective component comprises an upper cover and a dustproof cap, the upper end of the upper cover is provided with the dustproof cap, and a diversion airflow channel communicated with the protective cavity is formed between the upper cover and the dustproof cap; the diversion airflow channel comprises a side wall airflow channel and a main airflow channel which are vertically intersected;

and a waterproof breathable film is arranged above the main airflow channel.

Preferably, the upper cover comprises a connecting pipe and a second annular buckle, the second annular buckle is connected to the upper end of the connecting pipe, the main air flow channel is arranged at the geometric center of the connecting pipe, and the side wall air flow channel array is distributed on the second annular buckle.

Preferably, the inner side wall of the dustproof cap is provided with a first annular buckle, and lugs are distributed on the inner top surface of the dustproof cap in an array mode and used for limiting the assembly of the upper cover and the connecting pipe.

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

Preferably, the upper end face of the connecting pipe is provided with a groove for positioning and placing the waterproof and breathable film.

Preferably, the upper plane of the waterproof breathable film and the upper end face of the connecting pipe are located on the same horizontal plane and used for preventing blockage.

(III) advantageous effects

Compared with the prior art, the utility model provides a protective structure of air current diversion for gauge pressure sensor possesses following beneficial effect:

1. this kind of gauge pressure sensor is with protective structure of air current diversion, use through the cooperation that forms the diversion airflow channel who communicates with the protection cavity between upper cover and the dust cap, diversion airflow channel lateral wall airflow channel and main airflow channel make gas by the inside that 180 diversions entered into the protection cavity, when realizing pressure balance, external large granule dust and impurity such as liquid can't get into airflow channel under the action of gravity, even partial light impurity can get into airflow channel, depend on the lateral wall at airflow channel at the diversion in-process, good air current trafficability characteristic can be ensured to the lateral wall airflow channel that the circumference array was arranged, isolated large granule impurity when keeping pressure balance, thereby the mesh of pressure balance and protective structure combined action has been realized.

2. This kind of gauge pressure is protective structure of air current diversion for sensor, through the use of waterproof ventilated membrane, filter the air current, prevent that dust and water from entering into inside its protection cavity to the up end of the last plane of waterproof ventilated membrane and connecting pipe is located same horizontal plane, can avoid waterproof ventilated membrane to form the inner chamber that can accumulate dust or liquid, avoids impurity long-term accumulation to lead to blockking up waterproof ventilated membrane, influences pressure balance, and the precision of sensor.

Drawings

Fig. 1 is an exploded view of a protective structure for deflecting an airflow according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a protective structure for changing the direction of airflow according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of a dust cap of a protective structure for changing the direction of airflow according to an embodiment of the present invention.

Fig. 4 is an upper cover view of the protective structure for changing the direction of airflow according to the embodiment of the present invention.

Fig. 5 is an assembly view of the upper cover and the waterproof breathable film of the airflow direction changing protective structure according to the embodiment of the present application.

Fig. 6 is an application example of the airflow direction changing protection structure according to the embodiment of the present invention.

In the figure: 10 dust cap, 11 convex block, 12 first annular buckle, 13 inner top surface, 30 waterproof ventilated membrane, 31 waterproof ventilated membrane upper plane, 60 upper cover, 61 second annular buckle, 62 side wall airflow channel, 63 main airflow channel, 64 groove, 65 first plane, 66 connecting pipe upper end surface, 70 connecting pipe, 80 airflow channel, 100 airflow direction changing protective structure, 200 gauge pressure sensor module, 300 protective cavity.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by persons skilled in the art based on the embodiments in the present application without any creative work belong to the protection scope of the present application.

Referring to fig. 1-6, a protection structure for changing direction of airflow for a gauge pressure sensor according to an embodiment of the present invention is disclosed, which is composed of a dust cap 10, a waterproof breathable film 30 and an upper cover 60;

as shown in fig. 6 and 2, the protective structure 100 for changing the direction of the airflow is installed on the gauge pressure sensor module 200 to form a protective cavity 300 isolated from the outside, and the protective structure 100 for changing the direction of the airflow has the advantages that the protective cavity 300 can not only keep pressure balance with the outside atmosphere by convection, but also filter the airflow passing through the variable-direction airflow channel, and the waterproof breathable film 30 is arranged on the upper end surface of the connecting pipe 70, so that liquid seal is formed without forming liquid loading to cause blockage, thereby ensuring that the sensor has durable waterproof and dustproof characteristics and ensuring precision;

as shown in fig. 4, the upper cover 60 is provided with a first plane 65, a connecting pipe 70 is arranged on the first plane 65, at least one main airflow channel 63 is arranged at the geometric center of the connecting pipe 70, a second annular buckle 61 buckled with the dust cap 10 is arranged at the upper end of the connecting pipe 70, the second annular buckle 61 at the upper end of the connecting pipe 70 is provided with side wall airflow channels 62 arranged in a circumferential array, a diversion airflow channel 80 communicated with the protective cavity 300 is formed between the upper cover 60 and the dust cap 10, the diversion airflow channel 80 comprises the side wall airflow channel 62 and the main airflow channel 63, the side wall airflow channel 62 and the main airflow channel 63 are vertically intersected, and a groove 64 for sticking the waterproof breathable film 30 is arranged on the upper end surface 66 of the connecting pipe;

as shown in fig. 3, an annular first annular buckle 12 is arranged on the side wall inside the dust cap 10, an interference fit is formed between the first annular buckle 12 and the second annular buckle 61, and the inner top surface 13 of the dust cap 10 is provided with the lugs 11 distributed in an array; the number of the convex blocks 11 is four, and the convex blocks are used for being matched with the side wall airflow channel 62 on the connecting pipe 70 for limiting;

as shown in fig. 5, the waterproof breathable film 30 is concentrically disposed on the groove 64, the upper plane 31 of the waterproof breathable film and the upper end surface 66 of the connecting pipe are located on the same horizontal plane, and when the upper plane 31 of the waterproof breathable film is lower than the upper end surface 66 of the connecting pipe, an inner cavity capable of accumulating dust or liquid is formed, so that the phenomenon that the waterproof breathable film 30 is blocked due to the long-term accumulation of impurities is avoided.

When in use:

as shown in fig. 1, the utility model discloses a protective structure 100 of airflow diversion, airflow channel 80 is through 180 after turning to, get into inside cavity through waterproof ventilated membrane 30, impurity such as external large granule dust and liquid can not get into airflow channel 80 under the action of gravity, even partial light impurity can get into airflow channel 80, depend on the lateral wall at airflow channel 80 at the diversion in-process, good air current trafficability can be ensured to lateral wall airflow channel 62 that the circumference array arranged, be favorable to keeping pressure balance.

The protective structure for changing the direction of the airflow for the gauge pressure sensor is characterized in that a direction-changing airflow channel 80 communicated with a protective cavity 300 is formed between an upper cover 60 and a dustproof cap 10 for matching use, the direction-changing airflow channel 62 and a main airflow channel 63 on the side wall of the direction-changing airflow channel 80 enable the air to be changed by 180 degrees to enter the protective cavity 300, when pressure balance is realized, impurities such as external large-particle dust, liquid and the like cannot enter the airflow channel 80 under the action of gravity, even if part of light impurities can enter the airflow channel 80, the light impurities adhere to the side wall of the airflow channel 80 in the direction-changing process, the side-wall airflow channels 62 arranged in a circumferential array can ensure good airflow permeability, the large-particle impurities are isolated while pressure balance is kept, the purpose of coaction of the pressure balance and the protective structure is realized, the problem that the internal pressure of a gauge pressure sensor in the prior art is communicated with the environmental, the entry of a severe atmospheric environment such as liquid, moisture, dust particles, etc. into the pressure sensor has an effect on the measurement accuracy and durability of the pressure sensor, and there is a problem that the pressure sensor cannot be protected while achieving a balance of the reference pressure of the sensor.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a protective structure of table pressure sensor with air current diversion which characterized in that: the gauge pressure sensor comprises a gauge pressure sensor module (200), a protective component (100) is mounted at the upper end of the gauge pressure sensor module (200), and a protective cavity (300) is formed between the gauge pressure sensor module (200) and the protective component (100);

the protective component (100) comprises an upper cover (60) and a dustproof cap (10), the dustproof cap (10) is installed at the upper end of the upper cover (60), and a direction-changing airflow channel (80) communicated with the protective cavity (300) is formed between the upper cover (60) and the dustproof cap (10); the redirecting airflow channel (80) comprises a side wall airflow channel (62) and a main airflow channel (63) which are vertically intersected;

a waterproof breathable film (30) is arranged above the main air flow channel (63).

2. The gauge pressure sensor airflow direction changing protective structure according to claim 1, characterized in that: the upper cover (60) comprises a connecting pipe (70) and a second annular buckle (61), the second annular buckle (61) is connected to the upper end of the connecting pipe (70), the main air flow channel (63) is arranged at the geometric center of the connecting pipe (70), and the side wall air flow channels (62) are distributed on the second annular buckle (61) in an array.

3. The gauge pressure sensor airflow direction changing protective structure according to claim 2, characterized in that: the inner side wall of the dustproof cap (10) is provided with a first annular buckle (12), and convex blocks (11) are distributed on the inner top surface of the dustproof cap (10) in an array mode and used for limiting assembly of the upper cover (60) and the connecting pipe (70).

4. The gauge pressure sensor airflow direction changing protective structure according to claim 3, characterized in that: an interference fit is formed between the first annular buckle (12) and the second annular buckle (61).

5. The gauge pressure sensor airflow direction changing protective structure according to claim 2, characterized in that: the upper end face of the connecting pipe (70) is provided with a groove (64) for positioning and placing the waterproof breathable film (30).

6. The gauge pressure sensor airflow direction changing protective structure according to claim 2, characterized in that: the upper plane of the waterproof breathable film (30) and the upper end face of the connecting pipe (70) are positioned on the same horizontal plane and used for preventing blockage.