CN209459711U

CN209459711U - Gas flowmeter based on MEMS chip

Info

Publication number: CN209459711U
Application number: CN201920503148.5U
Authority: CN
Inventors: 李永坚; 吴英; 翟渊; 向毅; 施金良; 刘强
Original assignee: Guangzhou Only Control Industrial Technology Co Ltd; Chongqing University of Science and Technology
Current assignee: Guangzhou Only Control Industrial Technology Co Ltd; Chongqing University of Science and Technology
Priority date: 2019-04-12
Filing date: 2019-04-12
Publication date: 2019-10-01
Anticipated expiration: 2029-04-12

Abstract

The utility model discloses a kind of gas flowmeters based on MEMS chip, including the watchcase with inner cavity, the watchcase is equipped with air inlet and air outlet, gauge line is installed in the inner cavity, the gauge line includes main pipeline and measuring room, the main pipeline front end is connected to by admission line with air inlet, rear end setting outlet is connected to inner cavity, middle part is equipped with rectifier, main pipeline is being respectively equipped with the air inlet capillary and outlet capillary being connected to measuring room close to rectifier rear and front end position, wherein, the aperture of outlet capillary is greater than the aperture of air inlet capillary, MEMS chip and circuit board are installed in the measuring room, the utility model can effectively improve the accuracy of metric results, and the discharge of pollutant in watchcase can be facilitated, it is simple with structure, it is easy to use, the advantages that good reliability.

Description

Gas flowmeter based on MEMS chip

Technical field

The utility model belongs to measuring instrument technical field, and in particular to a kind of gas flowmeter based on MEMS chip.

Background technique

Existing domestic gas meter is usually mechanical diaphragm gauge, i.e., by pressure difference of the natural gas flow through gas meter, flow meter, makes The movement of measuring room interior diaphragm, then mechanical counter work is driven through a series of mechanical transmission mechanisms, realize the survey to gas flow Amount, not only structure is complicated for such gas meter, flow meter, and metric results are easy to be influenced by outside environmental elements such as temperature, accuracy It is poor.

The gas meter, flow meter of another kind of mainstream is IC card type gas meter, flow meter, can obtain reading more conveniently, is meter reading work belt Carry out great convenience, but its structure is still to be equally existed and be easy by external environment influence based on diaphragm gas meter, Measuring accuracy and the poor problem of accuracy.

Utility model content

In view of this, the present invention provides a kind of gas flowmeters based on MEMS chip, solve existing gas meter, flow meter and hold Vulnerable to external environment influence, the poor technical problem of metering accuracy.

To achieve the above object, technical solutions of the utility model are as follows:

A kind of gas flowmeter based on MEMS chip, including the watchcase with inner cavity, the watchcase is equipped with air inlet And gas outlet, it is characterized by: gauge line being installed in the inner cavity, which includes main pipeline and measuring room, the master Pipeline front end is connected to by admission line with air inlet, and rear end setting outlet is connected to inner cavity, and middle part is equipped with rectifier, supervisor Road is being respectively equipped with the air inlet capillary and outlet capillary being connected to measuring room close to rectifier rear and front end position, wherein The aperture of outlet capillary is greater than the aperture of air inlet capillary, is equipped with MEMS chip and circuit board in the measuring room.

Using the above structure, gas flow detection is carried out using MEMS chip, avoids outside environmental elements and metering is tied The influence of fruit effectively increases the accuracy of metric results.The rectifier being arranged in main pipeline can make the combustion gas gas flowed into While flowing more steady, resistance appropriate is provided, the indoor tolerance of metering is entered by air inlet capillary to increase；Air inlet hair Tubule is smaller than outlet capillary, and such design may insure that air-flow is more steady in measuring room, has further ensured metering As a result accuracy.

Preferably, the watchcase is in rectangular parallelepiped structure, is surrounded and is formed by the upper housing and lower case of setting symmetrical above and below, Air inlet setting in upper housing upper end, gas outlet setting in lower case lower end, such design while facilitating manufacture, Gas meter, flow meter is set to form top air inlet, the construction of lower section outlet facilitates the discharge of pollutant in watchcase.

In order to further increase filth-discharging effect, the watchcase lower end is additionally provided at least one sewage draining exit, the sewage draining exit with it is interior Chamber connection, and it is removably equipped with blanking cover, so in the long-term use, the sewage draining exit that can use lower end carries out Periodical blowdown, while the design makes it possible that acquisition above structure gas meter, flow meter is transformed using conventional gas table, and can Efficiently use the original air inlet/outlet of conventional gas table.

Preferably, the gauge line is horizontally disposed, to improve metering accuracy, to ensure admission line and gauge line Be reliably connected, admission line is preferably bend pipe, and upper end is vertically connected to air inlet, lower end bent to horizontal direction after with supervisor Road docking.

To ensure the sealing of admission line and main pipeline link position and being reliably connected, admission line is docked with main pipeline Position is equipped with flange connector, and main pipeline front end is equipped with sealed step in the corresponding flange connector position.

The aperture of air inlet capillary and the ratio in outlet capillary aperture are preferably 3:5, and such aperture design can make The air-flow for flowing into measuring room is in optimal steady state.

The rectifier includes the cowling panel being installed in main pipeline and the rectification hole that is evenly distributed on cowling panel, the knot The rectifier of structure can be while guaranteeing rectification effect, it is ensured that provided resistance is appropriate.

The utility model has the advantages that

Using the gas flowmeter based on MEMS chip of above technical scheme, the accurate of metric results can be effectively improved Property, and the discharge of pollutant in watchcase can be facilitated, have structure simple, it is easy to use, the advantages that good reliability.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model one of which embodiment；

Fig. 2 is the structural schematic diagram of gauge line in Fig. 1；

Fig. 3 is the structural schematic diagram of the utility model another kind embodiment.

Specific embodiment

The utility model is described in further detail with attached drawing with reference to embodiments.

Gas flowmeter based on MEMS chip as shown in Figure 1, the watchcase 1 including being substantially in hollow rectangular parallelepiped structure, The watchcase 1 is surrounded by the upper housing 11 and lower case 12 symmetrical above and below for being arranged and being fixed with one, and forms inner cavity 1a, It is equipped with vertically set air inlet 2 and gas outlet 3 in 11 upper end of upper housing, air inlet 2 and gas outlet 3 are respectively close to watchcase The two sides of 1 length direction.

Two sewage draining exits being connected to inner cavity 1a 9 are symmetrically arranged in 12 lower end of lower case, and sewage draining exit 9 is along the vertical direction downward Setting, position is corresponding with air inlet 2 and gas outlet 3 respectively, and blanking cover 10 is respectively configured to block the sewage draining exit 9, uses Cheng Zhong can use the sewage draining exit 9 and carry out the entrapped contaminants being periodically discharged in watchcase 1.

Gas outlet 3 is connected to inner cavity 1a, and air inlet 2 is vertically arranged admission line 5 by one and is connected with gauge line 4, the meter Buret 4 is arranged horizontally in the 1a of inner cavity, and 5 lower end of admission line is docked after bending to horizontal direction with gauge line 4.

Fig. 2 shows the specific structures of gauge line 4 comprising one along 4 length direction of gauge line, i.e., horizontally disposed Main pipeline 41,41 front end of main pipeline connect with 5 lower end of admission line, and rear end is arranged to form outlet 4a, and is connected to inner cavity 1a.

Main pipeline 41 is being equipped with sealed step 41a with 5 link position of admission line, and admission line 5 is equipped in corresponding position Flange connector 5a, after main pipeline 41 is connect with admission line 5, flange connector 5a is connected on sealed step 41a, and it is close to form step Envelope, while guaranteeing that connection is reliable, it is ensured that the sealing performance of pipeline enclosure.

The measuring room 42 to be formed that is recessed inwardly along its outer wall is equipped on gauge line 4, which passes through 45 envelope of cover board It closes, is relatively isolated with the inner cavity 1a with watchcase 1, while air inlet capillary 43 is set in the front end of measuring room 42, rear end is provided Gas capillary 44, and it is respectively communicated to main pipeline 41.

Region is equipped with MEMS chip 7 and circuit between air inlet capillary 43 and outlet capillary 44 in measuring room 42 Plate 8,43 apertures of aperture ratio air inlet capillary of outlet capillary 44 are bigger in the present embodiment, and ratio is about 5:3, such combustion gas When flowing into measuring room 42, air-flow is comparatively steady, advantageously ensures that the accuracy of metric results.

Rectifier 6 is embedded in the middle part of main pipeline 41, which is located at air inlet capillary 43 and outlet capillary 44 accesses The intermediate region of 41 position of main pipeline, i.e. air inlet capillary 43 are located at 6 front end of rectifier, and outlet capillary 44 is located at rectifier 6 Rear end, in the present embodiment, rectifier 6 includes fixed cowling panel 61 and being evenly distributed on cowling panel 61 with 41 tube wall of main pipeline Rectification hole 62, the rectification hole 62 is horizontally disposed, is mutually communicated the main pipeline 41 of 6 two sides of rectifier, gas metering In the process, rectifier 6 can make the gas flowed out via main pipeline 41 more steady, simultaneously because the blocking of the rectifier 6, makes Measuring room 42 can be entered through air inlet capillary 43 by obtaining more gases, improve metering accuracy.

Air inlet 2 is connected to the end of registering one's residence of gas pipeline, gas outlet 3 is connect with indoor gas end, natural gas warp when use Air inlet 2, admission line 5 introduce gauge line 4, and a part is flowed out by main pipeline 41, outlet 4a, gas outlet 3, and another part passes through Air inlet capillary 43 enters in measuring room 42, and MEMS chip 7 detects the gas flow, and generates flow signal, and circuit board 8 should It is exported after flow signal processing to the display module (not shown) in 1 outside of watchcase, or is transmitted in a wired or wireless fashion Control terminal realizes the teletransmission of metric results.

Fig. 3 shows another structure type of the utility model, and similar with former structure type, watchcase 1 is by upper The lower upper housing 11 and lower case 12 for being symmetrical arranged and being fixed with one surrounds, and forms inner cavity 1a, difference be by 12 lower end of lower case has been arrived in the setting of gas outlet 3, and deviates 2 side of air inlet, meanwhile, on upper housing 11 and lower case 12 It is configured with sewage draining exit 9, so as to periodical blowdown.

The arrangement of this upper entering and lower leaving can be such that air-flow flows in shell 1 smooth, and can be convenient discharge watchcase Dirt, dust and other impurities in 1 keep the cleaning in gauge line 4, in order to avoid influence the service life and metering standard of gas flowmeter True property.

Finally, it should be noted that foregoing description is only the preferred embodiment of the utility model, the common skill of this field Art personnel are under the enlightenment of the utility model, under the premise of without prejudice to the utility model aims and claim, can make Multiple similar expressions, such transformation are each fallen within the protection scope of the utility model.

Claims

1. a kind of gas flowmeter based on MEMS chip is set on the watchcase (1) including the watchcase (1) with inner cavity (1a) There are air inlet (2) and gas outlet (3), it is characterised in that: gauge line (4) are installed in the inner cavity (1a), the gauge line (4) packet Main pipeline (41) and measuring room (42) are included, main pipeline (41) front end is connected to by admission line (5) with air inlet (2), after End setting outlet (4a) is connected to inner cavity (1a), and middle part is equipped with rectifier (6), and main pipeline (41) is before rectifier (6) End positions are respectively equipped with the air inlet capillary (43) and outlet capillary (44) being connected to measuring room (42) afterwards, wherein outlet The aperture of capillary (44) is greater than the aperture of air inlet capillary (43), be equipped in the measuring room (42) MEMS chip (7) and Circuit board (8).

2. the gas flowmeter according to claim 1 based on MEMS chip, it is characterised in that: the watchcase (1) is in length Cube structure is surrounded and is formed by the upper housing (11) and lower case (12) of setting symmetrical above and below, and the air inlet (2) is arranged upper Shell (11) upper end, gas outlet (3) are arranged in lower case (12) lower end.

3. the gas flowmeter according to claim 1 or 2 based on MEMS chip, it is characterised in that: under the watchcase (1) End is additionally provided at least one sewage draining exit (9), which is connected to inner cavity (1a), and is removably equipped with blanking cover (10)。

4. the gas flowmeter according to claim 2 based on MEMS chip, it is characterised in that: gauge line (4) water Flat setting, admission line (5) are bend pipe, and upper end is vertically connected to air inlet (2), lower end bent to horizontal direction after with supervisor Road (41) docking.

5. the gas flowmeter according to claim 4 based on MEMS chip, it is characterised in that: the admission line (5) It is being equipped with flange connector (5a) with main pipeline (41) docking location, main pipeline (41) front end is in the corresponding position flange connector (5a) Equipped with sealed step (41a).

6. the gas flowmeter according to claim 1 based on MEMS chip, it is characterised in that: the air inlet capillary (43) ratio in aperture and outlet capillary (44) aperture is 3:5.

7. the gas flowmeter according to claim 1 based on MEMS chip, it is characterised in that: rectifier (6) packet The rectification hole (62) for including the cowling panel (61) being installed in main pipeline (41) and being evenly distributed on cowling panel (61).