CN217032856U - Double-nozzle gas differential pressure sensor - Google Patents

Abstract

The utility model discloses a double-nozzle gas differential pressure sensor which comprises a shell and a sensing element, wherein a first air nozzle and a second air nozzle are arranged on the shell, an airflow cavity is arranged in the shell, the first air nozzle and the second air nozzle are respectively communicated with the airflow cavity, a group of clamping blocks are also arranged on the inner wall of the shell, a group of clamping grooves matched with the clamping blocks are arranged on the sensing element, the sensing element is arranged above the airflow cavity in the shell, the clamping blocks on the inner wall of the shell are clamped in the clamping grooves, a group of mounting columns and a plurality of mounting support legs are also arranged on the shell, and through holes are formed in the mounting columns.

Description

Double-nozzle gas differential pressure sensor

The technical field is as follows:

the utility model belongs to the technical field of gas pressure difference detection, and particularly relates to a double-nozzle gas pressure difference sensor.

The background art comprises the following steps:

the gas differential pressure sensor is one of differential pressure sensors, can be used for measuring the pressure of different gases, and connects the gas differential pressure sensor with different gas pipelines when in use, and the existing gas differential pressure sensor also has the following defects in the production and use processes: during assembly, the sensing element and the sensor main body are generally directly sealed by glue filling, and the sensing element is easy to shift during glue filling, so that the consistency of products is not good; the part for connecting the gas pipeline is generally two cylindrical gas nozzles, and the gas nozzles are poor in tightness and easy to loosen when connected with the gas pipeline, and are easy to break; the zero drift is great, easily receive temperature influence etc. based on above-mentioned defect, this application provides a two mouth gas differential pressure sensor to overcome above-mentioned defect.

The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.

The utility model has the following contents:

the utility model aims to provide a double-nozzle gas differential pressure sensor, thereby overcoming the defects in the prior art.

In order to achieve the purpose, the utility model provides a double-nozzle gas differential pressure sensor which comprises a shell and a sensing element, wherein a first air nozzle and a second air nozzle are arranged on the shell, an airflow cavity is arranged in the shell, the first air nozzle and the second air nozzle are respectively communicated with the airflow cavity, a group of clamping blocks are further arranged on the inner wall of the shell, a group of clamping grooves matched with the clamping blocks are formed in the sensing element, the sensing element is arranged above the airflow cavity in the shell, the clamping blocks on the inner wall of the shell are clamped in the clamping grooves, a group of mounting columns and a plurality of mounting support legs are further arranged on the shell, and through holes are formed in the mounting columns.

Preferably, the first air tap and the second air tap are divided into a front section and a rear section, the rear section is directly arranged on the shell, the outer portion of the rear section is of a cylindrical structure, the front section is connected with the rear section, the outer portion of the front section is of a conical structure with a large diameter at one end and a small diameter at one end, and the large end of the front section is connected with the rear section and the diameter of the front section is larger than that of the rear section.

Preferably, the first air tap and the second air tap are further provided with an integral reinforcing plate at the rear section.

Preferably, the shell further extends towards two sides to form fixing lugs, and fixing holes are formed in the fixing lugs.

Preferably, the sensing element is a thermal flow sensor.

Preferably, the housing is of one-piece injection-molded construction.

Compared with the prior art, one aspect of the utility model has the following beneficial effects:

(1) the sensing element and the shell are fixed through the clamping groove and the clamping block, so that the position consistency between the sensing element and the shell can be ensured, and the consistency of subsequent products in glue pouring can be improved;

(2) the front sections of the first air nozzle and the second air nozzle are designed in a tapered structure, so that the tightness of connection between the first air nozzle and a gas pipeline can be improved, and meanwhile, the integral strength of the first air nozzle and the second air nozzle can be improved due to the design of the integral reinforcing plate;

(3) the design of the mounting column, the mounting support legs and the fixing lugs extending out of two sides on the shell can fix different positions according to different use occasions, so that the application range is wider;

(4) the sensing element adopts a thermal flow sensor, so that the measurement precision can be improved.

Description of the drawings:

FIG. 1 is a schematic view of a dual-orifice differential gas pressure sensor of the present invention;

FIG. 2 is an exploded view of a dual-orifice differential gas pressure sensor in accordance with the present invention;

FIG. 3 is a schematic view of the interior of the housing of a dual-orifice differential gas pressure sensor of the present invention;

the reference signs are: 1-shell, 11-clamping block, 12-mounting column, 121-through hole, 13-mounting support leg, 14-fixing lug, 15-fixing hole, 2-sensing element, 21-clamping groove, 3-air nozzle I, 4-air nozzle II, 5-airflow chamber and 6-integral reinforcing plate.

The specific implementation mode is as follows:

the following detailed description of specific embodiments of the utility model is provided, but it should be understood that the scope of the utility model is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 1-3, a double-nozzle gas differential pressure sensor includes a housing 1 and a sensing element 2, a first air nozzle 3 and a second air nozzle 4 are provided on the housing 1, an airflow chamber 5 is provided inside the housing 1, the first air nozzle 3 and the second air nozzle 4 are respectively communicated with the airflow chamber 5, a set of clamping block 11 is further provided at an inner wall of the housing 1, a set of clamping groove 21 matched with the clamping block 11 is provided on the sensing element 2, the sensing element 2 is provided above the airflow chamber 5 in the housing 1, wherein the clamping block 11 at the inner wall of the housing 1 is clamped into the clamping groove 21, a set of mounting posts 12 and a plurality of mounting legs 13 are further provided on the housing 1, and through holes 121 are provided in the mounting posts 12.

Preferably, the first air tap 3 and the second air tap 4 are divided into a front section and a rear section, wherein the rear section is directly arranged on the shell 1, the outer part of the front section is of a cylindrical structure and is connected with the rear section, the outer part of the front section is of a conical structure with a large diameter at one end and a small diameter at one end, and the large end of the front section is connected with the rear section and has a diameter larger than that of the rear section.

Preferably, an integral reinforcing plate 6 is further arranged at the position of the rear section of the first air nozzle 3 and the second air nozzle 4.

Preferably, fixing lugs 14 extend out of the two sides of the housing 1, and fixing holes 15 are formed in the fixing lugs 14.

Preferably, the sensing element 2 is a thermal flow sensor, and the thermal flow sensor senses flow values of different gases to obtain a pressure difference between the different gases, and the thermal flow sensor has higher precision and resolution, small zero drift and is not easily influenced by temperature, so that the measurement precision can be improved.

Preferably, the housing 1 is of one-piece injection molded construction.

The working principle of the utility model is as follows:

when the device is assembled, the clamping groove 21 on the sensing element 2 is clamped on the clamping block 11 on the inner wall of the shell 1, the joint between the sensing element 2 and the inner wall of the shell 1 is encapsulated by using encapsulation glue, when the device is used, the first air nozzle 3 and the second air nozzle 4 are respectively connected with different gas pipelines, two gases respectively flow into the airflow cavity 5 from the first air nozzle 3 and the second air nozzle 4, the sensing element 2 above the airflow cavity 5 senses the flow of the two gases to obtain the pressure difference of the two gases, one of the first air nozzle 3 and the second air nozzle 4 can be connected with a specific gas pipeline, the other gas can be directly communicated with the atmosphere, and the pressure difference between the specific gas and the atmosphere is measured at the moment; the two gases respectively flow into the gas flow chamber 5 and then flow out from the gas tap on the side with relatively low pressure, and the gas with relatively high pressure flows into the gas flow chamber 5 in a much smaller amount than the gas with relatively low pressure during the continuous measurement, so that the influence of the gas with relatively high pressure on the gas flow with relatively low pressure can be ignored.

Because the front sections of the first air nozzle 3 and the second air nozzle 4 are of the conical structures, the tightness of connection with a gas pipeline can be improved, the problem that the pipeline and the air nozzles are loosened is solved, the measurement stability can be improved, and the measurement precision is improved; the integral strength of the first air nozzle 3 and the second air nozzle 4 can be improved by the design of the integral reinforcing plate 6, and the air nozzles are prevented from being broken; the design of the mounting post 12, the through hole 121, the mounting legs 13 and the fixing ears 14 can mount and fix the shell 1 from different angles according to specific use occasions, and the application range is wider.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the utility model to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the utility model and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the utility model and various alternatives and modifications. It is intended that the scope of the utility model be defined by the claims and their equivalents.

Claims (6)

1. A kind of double-mouth gas differential pressure sensor, characterized by that: the air faucet comprises a shell and a sensing element, wherein a first air faucet and a second air faucet are arranged on the shell, an airflow cavity is arranged inside the shell, the first air faucet and the second air faucet are respectively communicated with the airflow cavity, a set of clamping blocks are further arranged at the inner wall of the shell, a set of clamping grooves matched with the clamping blocks are formed in the sensing element, the sensing element is arranged above the airflow cavity in the shell, the clamping blocks at the inner wall of the shell are clamped in the clamping grooves, a set of mounting columns and a plurality of mounting support legs are further arranged on the shell, and through holes are formed in the mounting columns.

2. A dual-nozzle differential gas pressure sensor as recited in claim 1, wherein: the air cock is divided into two front sections and two rear sections, wherein the rear section is directly arranged on the shell, the outer part is of a cylindrical structure, the front section is connected with the rear section, the outer part of the front section is of a conical structure with one large diameter and one small diameter, and the large end of the diameter is connected with the rear section and the diameter of the large end of the diameter is larger than that of the rear section.

3. A dual-nozzle differential gas pressure sensor as recited in claim 2, wherein: and the positions of the first air nozzle and the second air nozzle at the rear section are also provided with an integral reinforcing plate.

4. A dual-nozzle differential gas pressure sensor as recited in claim 1, wherein: the shell also extends towards the two sides to form fixing lugs, and fixing holes are formed in the fixing lugs.

5. A dual nozzle differential gas pressure sensor as in claim 1 wherein: the sensing element employs a thermal flow sensor.

6. A dual-nozzle differential gas pressure sensor as recited in claim 1, wherein: the shell is of an integrated injection molding structure.

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