CN215639614U - Explosion-proof gas flowmeter - Google Patents
Explosion-proof gas flowmeter Download PDFInfo
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- CN215639614U CN215639614U CN202121292365.8U CN202121292365U CN215639614U CN 215639614 U CN215639614 U CN 215639614U CN 202121292365 U CN202121292365 U CN 202121292365U CN 215639614 U CN215639614 U CN 215639614U
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Abstract
The utility model provides an explosion-proof gas flowmeter, which relates to the technical field of measuring instruments and comprises a measuring main body and a circuit board, wherein the circuit board receives a signal from the measuring main body and converts the signal into an electric signal for output, a synchronous gear cover is fixed between the measuring main body and the circuit board, and the synchronous gear cover seals the measuring main body. The circuit board and the measuring main body are separated by arranging the synchronous gear cover, so that gas cannot enter the circuit board, and the purposes of preventing the gas from burning in the cavity by electric ignition and further achieving an explosion-proof function are achieved.
Description
Technical Field
The utility model relates to the technical field of measuring instruments, in particular to an explosion-proof gas flowmeter.
Background
The Roots flowmeter is a high-precision gas flow meter, and realizes the purpose of metering by utilizing the rotation of a waist wheel in a metering cavity.
At present, the gas roots flowmeter is quite perfect in technology and structure, such as a gas roots flow agent disclosed in patent CN 201721604963.8; however, in order to ensure that the waist wheel can be driven by gas flow to rotate and reduce the friction force between the waist wheel rotating shaft and the main body shell, a sealing ring is not arranged between a cavity in which the gas flows and a cavity in which the synchronizing gear is arranged, but a bearing is arranged, so that the gas can seep through the bearing to enter the synchronizing gear when the flow is measured, but the synchronizing gear, the sensor and the signal sending device are in the same cavity, and the gas flowmeter usually measures combustible gas such as shale gas, so that the gas is easily ignited to combust in the cavity, and further explosion is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an explosion-proof gas flowmeter, aiming at the defects of the prior art, and realizing the purposes that a synchronous gear and a circuit board are arranged in different closed cavities on the premise that the circuit board can stably receive flow signals given by a magnetic column and send electric signals, so that the gas is further prevented from burning in the cavities by electric ignition, and the explosion-proof function is realized.
The embodiment of the utility model is realized by the following technical scheme: the utility model provides an explosion-proof gas flowmeter, includes and measures main part and circuit board, the circuit board is used for receiving the signal that comes from measuring the main part and converts into the signal of telecommunication output, be fixed with the synchronous gear lid between measurement main part and the circuit board, the synchronous gear lid seals the measurement main part.
Further, measure the main part and include the main part shell, synchronous gear lid and main part shell terminal surface fixed connection to the fixed connection position of synchronous gear lid and main part shell is provided with the sealing washer.
Furthermore, two parallel side surfaces of the main body shell are respectively provided with a fluid inlet and a fluid outlet.
Furthermore, at least one waist wheel is arranged in the main body shell, a synchronous gear is coaxially arranged on a rotating shaft of the waist wheel, a plurality of pairs of magnetic columns are arranged on the synchronous gear, and the circuit board is provided with a Hall element for inducing the change of the magnetic field.
Further, the magnetic columns are uniformly distributed on the same synchronous gear, and the two magnetic columns in each pair of magnetic columns are opposite in polarity after installation.
Further, the magnetic columns are evenly distributed on each synchronous gear, and the two magnetic columns in each pair of magnetic columns are opposite in polarity after installation.
Further, the main body shell comprises a bottom cover and a waist wheel gland, the waist wheel gland is installed between the synchronizing gear and the waist wheel, and the bottom cover and the waist wheel gland both support a rotating shaft of the waist wheel.
Furthermore, the synchronous gear cover is connected with a circuit board cover, and the circuit board is arranged in a cavity formed by the synchronous gear cover and the circuit board cover; the circuit board cover is provided with a signal wire seal.
The technical scheme of the embodiment of the utility model at least has the following advantages and beneficial effects:
the circuit board and the measuring main body are separated by arranging the synchronous gear cover, so that gas cannot enter the circuit board, and the purposes of preventing the gas from burning in the cavity by electric ignition and further achieving an explosion-proof function are achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view in another aspect of the present invention;
icon: 1-sealing a signal wire; 2-a circuit board; 3-a circuit board cover; 4-a synchronizing gear cover; 5-sealing ring; 6-main body shell; 7-a fluid outlet; 8-a waist wheel; 9-bottom cover; 10-a fluid inlet; 11-synchronize this wheel; 12-a magnetic column; 13-a lumbar wheel gland; 14-Hall element.
Detailed Description
In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the products of the present invention are used, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the device or element which is referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-2, an explosion-proof gas flowmeter comprises a measuring main body and a circuit board 2, wherein the circuit board 2 is used for receiving a signal from the measuring main body and converting the signal into an electric signal for output, a synchronous gear cover 4 is fixed between the measuring main body and the circuit board 2, and the synchronous gear cover 4 seals the measuring main body to separate the circuit board 2 from the measuring main body and ensure that gas does not enter the circuit board 2, so that the gas is prevented from being combusted in a cavity due to electric ignition, and an explosion-proof function is further achieved.
Further, in order to prevent the combustible gas from leaking from the joint of the synchronous gear cover 4 and the main body shell 6, the measuring main body comprises a main body shell 6, the end surfaces of the synchronous gear cover 4 and the main body shell 6 are fixedly connected through screws, a sealing ring 5 is arranged at the fixed connection position of the synchronous gear cover 4 and the main body shell 6, and the sealing ring 5 is pressed by the synchronous gear cover 4 and the main body shell 6.
In this embodiment, two parallel side surfaces of the main body housing 6 are respectively provided with a fluid inlet 10 and a fluid outlet 7, the gas fluid enters the main body housing 6 from the fluid inlet 10, and when leaving the main body housing 6 from the fluid outlet 7, the gas fluid flows in the main body housing 6, and the flow rate of the gas fluid is measured.
In this embodiment, at least one waist wheel 8 is disposed in the main body housing 6, the number of the waist wheels shown in the drawing is two, the power for rotating the waist wheels 8 comes from the kinetic energy of the gas fluid flowing, a synchronous gear 11 is coaxially disposed on the rotating shaft of the waist wheels 8, the waist wheels 8 rotate one circle, and the synchronous gear 11 rotates one circle, so as to bring the amount of the gas fluid flowing through the waist wheels 8 to the synchronous gear 11; the synchronous gear 11 is provided with a plurality of pairs of magnetic columns 12, the circuit board 2 is provided with a Hall element 14 for inducing the change of a magnetic field, the synchronous gear 11 rotates for a circle, the position of the magnetic columns 12 arranged on the synchronous gear 11 changes for a circle, namely, the change of the magnetic field generated by the magnetic columns 12 is circulated once, and the aim of measuring the flow of gas fluid flowing through the main body shell 6 is achieved.
In the present embodiment, one way of arranging the magnetic cylinder 12 is as follows:
in order to reduce the material usage of the magnetic columns 12, the magnetic columns 12 are evenly distributed on the same synchronizing gear 11, and the two magnetic columns 12 in each pair of magnetic columns 12 are opposite in polarity after installation.
In the present embodiment, another way of arranging the magnetic pillar 12 is as follows:
in order to improve the accuracy of the measurement, the magnetic columns 12 are uniformly distributed on each synchronizing gear 11, and the two magnetic columns 12 in each pair of magnetic columns 12 have opposite polarities after being installed; the synchronous gear cover 4 is made of aluminum, the magnetic columns 12 can be subjected to force for blocking magnetic flux change according to the Lenz law, the more the synchronous gears 11 provided with the magnetic columns 12 are, the larger the resistance is, the higher the precision is, the resistance can be adapted to the rotating speed of the synchronous gears 11, and the slower the rotating speed is, the smaller the magnetic flux change speed is, and the smaller the resistance is; conversely, the greater the resistance.
It should be noted that the purpose of the opposite polarity is to form a closed magnetic induction line.
In this embodiment, the main body housing 6 includes a bottom cover 9 and a sheave cover 13, the sheave cover 13 is installed between the synchronizing gear 11 and the sheave 8, the bottom cover 9 and the sheave cover 13 both support the rotating shaft of the sheave 8, and bearings are installed at positions where the bottom cover 9 and the sheave cover 13 support the rotating shaft of the sheave 8 in order to reduce the friction force between the rotating shaft of the sheave 8 and the bottom cover 9 and the sheave cover 13 as much as possible.
In this embodiment, the synchronizing gear cover 4 is connected to the circuit board cover 3, the circuit board 2 is disposed in a cavity formed by the synchronizing gear cover 4 and the circuit board cover 3, and the cavity is encapsulated by epoxy; the circuit board cover 3 is provided with a signal wire seal 1 for passing through a signal wire.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An explosion-proof gas flowmeter comprising a measuring body and a circuit board (2), the circuit board (2) being configured to receive a signal from the measuring body and convert the signal into an electrical signal output, characterized in that: a synchronous gear cover (4) is fixed between the measuring main body and the circuit board (2), and the synchronous gear cover (4) seals the measuring main body.
2. The explosion-proof gas flow meter of claim 1, wherein: the measuring main body comprises a main body shell (6), the synchronous gear cover (4) is fixedly connected with the end face of the main body shell (6), and a sealing ring (5) is arranged at the position of fixedly connecting the synchronous gear cover (4) with the main body shell (6).
3. The explosion proof gas flow meter of claim 2, wherein: two parallel side surfaces of the main body shell (6) are respectively provided with a fluid inlet (10) and a fluid outlet (7).
4. The explosion proof gas flow meter of claim 2, wherein: at least one waist wheel (8) is arranged in the main body shell (6), a synchronizing gear (11) is coaxially arranged on a rotating shaft of the waist wheel (8), a plurality of pairs of magnetic columns (12) are arranged on the synchronizing gear (11), and the circuit board (2) is provided with a Hall element (14) which induces the change of a magnetic field.
5. The explosion-proof gas flow meter of claim 4, wherein: the magnetic columns (12) are uniformly distributed on the same synchronous gear (11), and the two magnetic columns (12) in each pair of magnetic columns (12) have opposite polarities after being installed.
6. The explosion-proof gas flow meter of claim 4, wherein: the magnetic columns (12) are uniformly distributed on each synchronous gear (11), and the two magnetic columns (12) in each pair of magnetic columns (12) have opposite polarities after being installed.
7. The explosion-proof gas flow meter of claim 4, wherein: the main body shell (6) comprises a bottom cover (9) and a waist wheel gland (13), the waist wheel gland (13) is installed between the synchronizing gear (11) and the waist wheel (8), and the bottom cover (9) and the waist wheel gland (13) both support a rotating shaft of the waist wheel (8).
8. The explosion-proof gas flow meter of claim 1, wherein: the synchronous gear cover (4) is connected with a circuit board cover (3), and the circuit board (2) is arranged in a cavity formed by the synchronous gear cover (4) and the circuit board cover (3); the circuit board cover (3) is provided with a signal wire seal (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121292365.8U CN215639614U (en) | 2021-06-09 | 2021-06-09 | Explosion-proof gas flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121292365.8U CN215639614U (en) | 2021-06-09 | 2021-06-09 | Explosion-proof gas flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215639614U true CN215639614U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121292365.8U Active CN215639614U (en) | 2021-06-09 | 2021-06-09 | Explosion-proof gas flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215639614U (en) |
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2021
- 2021-06-09 CN CN202121292365.8U patent/CN215639614U/en active Active
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