CN210221166U - Gas flowmeter - Google Patents

Abstract

The utility model discloses a gas flowmeter relates to metering device technical field. The gas flow meter comprises a shell and a rectifying baffle arranged in the shell, wherein a gap is formed between one end face of the rectifying baffle and the shell, the rectifying baffle divides the inside of the shell into a first cavity and a second cavity which are communicated with each other, a first rectifying assembly is arranged in the first cavity, a second rectifying assembly is arranged in the second cavity, and the second rectifying assembly comprises a mass flow sensor and is used for measuring gas passing through the second rectifying assembly. The stability and reliability of measurement can be improved.

Description

Gas flowmeter

Technical Field

The utility model relates to a metering device technical field particularly, relates to a gas flowmeter.

Background

The gas flowmeter is one of the common instruments in process automation instruments and devices, is widely applied to various fields of national economy such as industrial production, experimental research, daily life and the like, is an important tool for developing industrial and agricultural production, saving energy, improving product quality, improving economic benefit and management level, and plays an important role in national economy.

In the prior art, a gas flowmeter directly adopts a gas inlet pipe and a gas outlet pipe on one side of a cavity formed by a shell, and a cover plate sealed with an opening of the cavity, wherein a gas flow passage between the gas inlet pipe and the gas outlet pipe forms a connecting passage, so that gas flow is relatively stable, and the flow at the gas pipe is more accurately measured.

However, in the conventional structure, the outlet pipe is fixed to the housing in a cantilever state, and the gas flow path still has a certain impact force on the outlet pipe, causing a slight swing of the outlet pipe, which causes a problem that the flow rate cannot be stably measured. The method of adding the supporting structure at the cantilever end of the outlet pipe increases the difficulty of press sealing of the shell, easily causes unqualified shell air tightness and influences the final measurement stability and the measurement reliability.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a gas flowmeter can promote measuring stability and reliability.

The embodiment of the utility model is realized like this:

an embodiment of the utility model provides a gas flowmeter, including the casing, and set up rectification baffle in the casing, a terminal surface of rectification baffle with be formed with the clearance between the casing, the rectification baffle will inside first cavity and the second cavity of dividing into mutual intercommunication of casing, be provided with first rectification subassembly in the first cavity, be provided with second rectification subassembly in the second cavity, second rectification subassembly includes mass flow sensor for measure and pass through the gas of second rectification subassembly.

Optionally, the first fairing assembly includes a shut-off valve including a valve body, and first and second connection channels in communication with the valve body, respectively, the first connection channel being in communication with an inlet duct provided on the housing.

Optionally, first rectification subassembly still includes the filter core, the filter core is located in the first connecting channel, just the one end of filter core with entry pipeline inner wall joint.

Optionally, the second rectification assembly further comprises a rectification channel, the rectification channel comprises a contraction section, a first connection section, a diffusion section and a second connection section which are sequentially communicated, the contraction section and the diffusion section are of a circular truncated cone structure, the small ends of the contraction section and the diffusion section are respectively communicated with the first connection section, and the mass flow sensor is located at the first connection section.

Optionally, the rectifying channel is communicated with an outlet pipe arranged on the housing, and the rectifying channel and the outlet pipe are located on the same straight line.

Optionally, the second rectifying assembly further comprises a grid and a rectifier, the grid is located at one end of the contraction section away from the first connection section, and the rectifier is located at one end of the second connection section away from the diffusion section.

Optionally, the inlet pipe and the outlet pipe are located on the same side of the housing, and the inlet pipe and the outlet pipe are connected through a connecting bracket.

Optionally, the housing comprises an upper housing and a lower housing which are buckled with each other, and a joint of the upper housing and the lower housing is sealed by a sealing ring.

Optionally, the junction of going up the casing with the casing down is provided with first recess and second recess respectively, first recess with the second recess forms joint portion jointly, be provided with first support frame on the rectification passageway, first support frame with joint portion joint.

Optionally, a second support frame is arranged on the stop valve, and the second support frame is clamped with the clamping portion.

The utility model discloses beneficial effect includes:

the embodiment of the utility model provides a gas flowmeter makes the inside first cavity and the second cavity of dividing of casing through the rectification baffle that sets up in the casing to can promote the support intensity of casing. The first chamber and the second chamber are communicated with each other through a gap formed between one end face of the rectifying baffle and the shell. Through the first rectification subassembly of setting in first cavity, can make the measurand gas that gets into gas flowmeter carry out preliminary rectification, like air current vortex cutting, air current pulsation buffering etc.. Under the action of the first rectifying component, the airflow entering the first cavity is smooth. The measured gas flowing to the first chamber through the first rectifying assembly enters the second chamber through a gap formed between one end face of the rectifying baffle and the shell, and in the process, the measured gas is rectified again, so that the measured gas rectified again enters the second rectifying assembly in a laminar flow state. The measured gas flowing through the second rectifying assembly is fully rectified again and finally detected by the mass flow sensor, and the stability and the reliability of measurement can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required 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 diagram of a gas flowmeter according to an embodiment of the present invention;

fig. 2 is a second schematic structural diagram of a gas flowmeter according to an embodiment of the present invention;

fig. 3 is a third schematic structural diagram of a gas flowmeter according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a second rectifying assembly according to an embodiment of the present invention.

Icon: 100-a gas flow meter; 110-a housing; 1102-an upper housing; 1104-a lower housing; 1106-sealing ring; 1108 — a first groove; 1109-second groove; 112-a first chamber; 114-a second chamber; 116-an inlet duct; 118-an outlet conduit; 119-a linking scaffold; 120-a rectifying baffle; 122-a gap; 130-a first rectifying component; 132-a shut-off valve; 1322-a valve body; 1324-first connection channel; 1326-a second connection channel; 1328-a second support; 134-a filter element; 140-a second rectifying component; 142-a mass flow sensor; 144-a rectifying channel; 1442-a constriction; 1444 — first connecting section; 1446-a diffuser section; 1448 — second connecting section; 1449 — first support frame; 146-a grid; 148-rectifier.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "inside" and "outside" are used for indicating the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the utility model is usually placed when using, and are only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element to be referred must have a specific position, be constructed and operated in a specific position, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, the present embodiment provides a gas flowmeter 100, including a housing 110 and a rectification baffle 120 disposed in the housing 110, wherein a gap 122 is formed between an end surface of the rectification baffle 120 and the housing 110, the rectification baffle 120 divides the interior of the housing 110 into a first chamber 112 and a second chamber 114 which are communicated with each other, a first rectification component 130 is disposed in the first chamber 112, a second rectification component 140 is disposed in the second chamber 114, and the second rectification component 140 includes a mass flow sensor 142 for measuring gas passing through the second rectification component 140.

It should be noted that, first, the housing 110 is a sealing structure, and only then, it can be ensured that the measured gas passing through the first rectifying component 130, the gap 122 and the second rectifying component 140 in sequence cannot leak, and cannot be influenced by the external gas, so as to ensure the normal use and the stability of the gas flowmeter 100 during use.

Second, the embodiment of the present invention does not specifically limit the form of the mass flow sensor 142, as long as the detection that can be stable is measured by the gas. For example, the mass flow sensor 142 may be implemented as a MEMS (micro-electro-mechanical system) mass flow sensor chip, which has the advantages of wide range of measurement range, fast response speed, high sensitivity, low power consumption, near zero start, high consistency and reliability, and is convenient for calibration and maintenance.

The embodiment of the utility model provides a gas flowmeter 100 makes casing 110 inside divide into first cavity 112 and second cavity 114 through the rectification baffle 120 of setting in casing 110 to can promote casing 110's support intensity. The first chamber 112 and the second chamber 114 are communicated with each other through a gap 122 formed between one end surface of the rectification baffle 120 and the casing 110. The first flow straightening assembly 130 disposed in the first chamber 112 can primarily straighten the measured gas entering the gas meter 100, such as gas flow vortex cutting, gas flow pulsation dampening, etc. The airflow into the first chamber 112 is smoothed by the first fairing assembly 130. The measured gas flowing through the first flow rectification assembly 130 to the first chamber 112 enters the second chamber 114 through the gap 122 formed between the one end surface of the flow rectification baffle 120 and the housing 110, and in this process, the measured gas is again rectified, so that the measured gas, which is again rectified, enters the second flow rectification assembly 140 in a laminar flow state. The measured gas flowing through the second rectification assembly 140 is fully rectified again and is finally detected by the mass flow sensor 142, so that the stability and the reliability of measurement can be improved.

As shown in fig. 1, the first rectification assembly 130 includes a blocking valve 132, the blocking valve 132 includes a valve body 1322, and first and second connection passages 1324 and 1326 respectively communicating with the valve body 1322, the first connection passage 1324 communicating with the inlet duct 116 provided on the housing 110.

Specifically, the shut-off valve 132 may be an electromagnetic valve, and the electromagnetic valve is closed automatically when the gas flowmeter 100 is low in power, defaulting or fails to perform normal metering, so as to effectively prevent potential safety hazards. The gas passing through the shut-off valve 132 may also serve as a flow straightener. The outer side wall of the inlet pipe 116 is provided with connecting threads to facilitate connection with a gas pipe so that the gas to be measured enters the gas meter 100 along the inlet pipe 116. By combining the inlet pipe 116, the first connecting passage 1324, the valve body 1322 and the second connecting passage 1326, the gas enters the first chamber 112, and the passage can be cut off by the valve body 1322 while the gas is rectified, so that the safety of use is ensured.

In addition, the embodiment of the present invention does not specifically limit the shapes of the first connection passage 1324 and the second connection passage 1326. For example, the first connection passage 1324 may be configured as a truncated cone-shaped passage as shown in fig. 1, and the second connection passage 1326 may be configured as a cylindrical passage, and of course, the first connection passage 1324 may be configured as a cylindrical passage as long as it can perform the functions of gas conduction and rectification.

As shown in fig. 1, the first fairing assembly 130 further includes a filter element 134, the filter element 134 is disposed in the first connecting passage 1324, and one end of the filter element 134 is clamped to the inner wall of the inlet duct 116.

Specifically, the inner wall of the inlet pipe 116 may be provided with an annular protrusion, and one end of the filter element 134 is clamped with the inlet pipe 116 through the annular protrusion, so that the filter element 134 can be conveniently taken out from the inlet pipe 116 to be cleaned and maintained. Through the filter element 134 located in the first connecting passage 1324, impurities in the pipeline are prevented from entering the gas flowmeter 100 to pollute the mass flow sensor 142 and influence the measurement accuracy. The gas to be measured can be filtered while the gas to be measured can be rectified, and the improvement of the measurement precision is facilitated.

As shown in fig. 1 and 2, the second flow-adjusting assembly 140 further includes a flow-adjusting passage 144, the flow-adjusting passage 144 includes a contracting section 1442, a first connecting section 1444, a diffusing section 1446 and a second connecting section 1448 which are sequentially communicated, the contracting section 1442 and the diffusing section 1446 are truncated cone structures, small ends of the contracting section 1442 and the diffusing section 1446 are respectively communicated with the first connecting section 1444, and the mass flow sensor 142 is located at the first connecting section 1444.

Specifically, since the contraction section 1442 and the diffusion section 1446 are circular truncated cone structures, the small ends of the contraction section 1442 and the diffusion section 1446 are respectively communicated with the first connection section 1444, and when gas flows through the first connection section 1444, the flow rate of the gas is fastest. At this time, since the mass flow sensor 142 is located at the first connection section 1444, that is, the mass flow sensor 142 is disposed at the minimum inner diameter of the rectifying passage 144, it is possible to increase the sensitivity of the mass flow sensor 142 and to improve the measurement accuracy.

As shown in fig. 2, the rectifying passage 144 communicates with the outlet duct 118 provided on the housing 110, and the rectifying passage 144 and the outlet duct 118 are located on the same line.

Thus, when mass flow sensor 142 is dirty, mass flow sensor 142 can be cleaned directly from outlet pipe 118 with the help of tools, disassembly maintenance is avoided, operation difficulty is reduced, maintenance efficiency is improved, and maintenance cost is reduced.

As shown in fig. 4, the second rectifying assembly 140 further includes a grid 146 and a rectifier 148, the grid 146 is located at an end of the contraction section 1442 away from the first connection section 1444, and the rectifier 148 is located at an end of the second connection section 1448 away from the diffusion section 1446.

Thus, when the gas in the second chamber 114 enters the rectifying passage 144, the gas first passes through the rectifying action of the grid 146, so that the passing gas collides and is integrated in the grid 146, the gas flowing in the horizontal direction before entering the grid 146 is adjusted to flow in the vertical direction, and the velocity distribution of the gas entering the grid 146 is relatively uniform. By providing the rectifier 148 at an end of the second connecting section 1448 away from the diffuser section 1446, the influence of the downstream gas fluctuation on the measurement accuracy can be prevented, the measurement stability is facilitated, and the measurement accuracy is improved.

Alternatively, as shown in fig. 1, the inlet duct 116 and the outlet duct 118 are located on the same side of the housing 110, and the inlet duct 116 and the outlet duct 118 are connected by a connecting bracket 119.

Specifically, in practical applications, the inlet pipe 116 and the outlet pipe 118 may be disposed on the same side of the housing 110, or may be disposed on different sides, so as to promote the diversity of the connection with the external pipes. In this embodiment, it is preferable that the inlet duct 116 and the outlet duct 118 are located on the same side of the housing 110, and the inlet duct 116 and the outlet duct 118 are connected by a connecting bracket 119. Thus, the torque and bending moment of the housing 110 are enhanced, the mechanical impact resistance is improved, and the structural strength of the joint of the inlet pipe 116 and the outlet pipe 118 is improved.

As shown in fig. 2 and 3, the housing 110 includes an upper housing 1102 and a lower housing 1104 that are engaged with each other, and a joint between the upper housing 1102 and the lower housing 1104 is sealed by a sealing ring 1106.

Thus, the first rectifying component 130 and the second rectifying component 140 are conveniently installed and sealed after assembly, operation difficulty is reduced, and assembly and packaging efficiency is improved.

As shown in fig. 2, a first groove 1108 and a second groove 1109 are respectively disposed at a joint of the upper housing 1102 and the lower housing 1104, the first groove 1108 and the second groove 1109 together form a clamping portion, a first support 1449 is disposed on the rectifying channel 144, and the first support 1449 is clamped with the clamping portion.

Specifically, the second connecting section 1448 of the rectifying channel 144 may be fixedly connected to the upper housing 1102 through a connecting portion, but the contracting section 1442 of the rectifying channel 144 is in a cantilever state, which is unstable and is easily shaken by the air flow impact to affect the rectifying effect. The rectifying passage 144 is more stable by the first support 1449 disposed on the rectifying passage 144 to form a clamping relationship between the rectifying passage 144 and the housing 110. Simultaneously, through the cooperation of first recess 1108 and second recess 1109, can be earlier with first recess 1108 and first support frame 1449 joint back, casing 1104 under the lock, whole process goes on under the visual, and the counterpoint is convenient to can improve the maneuverability of equipment.

As shown in fig. 3, the blocking valve 132 is provided with a second support 1328, and the second support 1328 is engaged with the engaging portion.

Specifically, the first connection passage 1324 of the blocking valve 132 may be fixedly connected to the upper housing 1102 through a connection portion, but the second connection passage 1326 is in a cantilever state, and when gas flows out of the blocking valve 132, the gas is easily shaken by the impact of the gas flow, and the rectification effect is affected. The blocking valve 132 is engaged with the housing 110 by the second support 1328 provided on the blocking valve 132, so that the second connecting passage 1326 is prevented from being shaken by the air flow. Other advantages are similar to those of the first support frame 1449, and are not described in detail herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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 (10)

1. The utility model provides a gas flowmeter, its characterized in that includes the casing, and sets up the rectification baffle in the casing, a terminal surface of rectification baffle with be formed with the clearance between the casing, the rectification baffle will the casing is inside to be divided into first cavity and the second cavity of intercommunication each other, be provided with first rectification subassembly in the first cavity, be provided with second rectification subassembly in the second cavity, second rectification subassembly includes mass flow sensor, is used for measuring the gas that passes through second rectification subassembly.

2. A gas meter as claimed in claim 1, wherein the first fairing assembly includes a shut-off valve comprising a valve body and first and second connection channels in communication with the valve body, respectively, the first connection channel being in communication with an inlet conduit provided on the housing.

3. The gas meter of claim 2, wherein the first fairing assembly further comprises a filter element positioned within the first connection channel, and wherein one end of the filter element is clamped to the inner wall of the inlet conduit.

4. The gas flowmeter of claim 2, wherein the second rectifying assembly further comprises a rectifying channel, the rectifying channel comprises a contraction section, a first connection section, a diffusion section and a second connection section which are sequentially communicated, the contraction section and the diffusion section are in a circular truncated cone structure, small ends of the contraction section and the diffusion section are respectively communicated with the first connection section, and the mass flow sensor is located at the first connection section.

5. A gas meter as claimed in claim 4, wherein the rectifying channel communicates with an outlet conduit provided on the housing, and the rectifying channel and the outlet conduit are located on the same line.

6. A gas meter as claimed in claim 4, wherein the second fairing assembly further comprises a grating at an end of the convergent section remote from the first connection section and a fairing at an end of the second connection section remote from the divergent section.

7. A gas meter as claimed in claim 5, wherein the inlet conduit and the outlet conduit are located on the same side of the housing and are connected by a connecting bracket.

8. The gas meter of claim 4, wherein the housing comprises an upper housing and a lower housing that snap-fit to each other, and a joint of the upper housing and the lower housing is sealed by a seal ring.

9. The gas flowmeter of claim 8, wherein a first groove and a second groove are respectively formed at the joint of the upper housing and the lower housing, the first groove and the second groove jointly form a clamping portion, a first support frame is arranged on the rectifying channel, and the first support frame is clamped with the clamping portion.

10. The gas flowmeter of claim 9, wherein the shut-off valve is provided with a second support bracket that is snap-fitted to the snap-fit portion.

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