CN221826236U - Gas mass flowmeter and gas flow measurement system - Google Patents

Abstract

The embodiment of the utility model provides a gas mass flowmeter and a gas flow measurement system, which relate to the field of gas flow measurement. The gas mass flowmeter includes a tube body and a sensor assembly, wherein the tube body has a first accommodating cavity and an airflow channel for gas circulation; the sensor assembly includes a rectifier, a measuring part, an extension part, a sealing plate and a lead connector; the rectifier, the extension part, the sealing plate and the lead connector are connected in sequence; wherein the rectifier is placed in the airflow channel, a rectifier channel is provided on the rectifier, and the rectifier channel is connected to the airflow channel; one end of the measuring part is located in the rectifier channel, and the other end of the measuring part is connected to the lead connector; the sealing plate is connected to the tube body for sealing the first accommodating cavity; the lead connector is located in the first accommodating cavity. The gas mass flowmeter reduces the gas flowing through the chip by placing the rectifier channel in the airflow channel, and the gas is more stable, thereby making the measurement of the gas flow more accurate.

Description

A gas mass flow meter and a gas flow measurement system

Technical Field

The utility model relates to the field of gas flow measurement, in particular to a gas mass flow meter and a gas flow measurement system.

Background Art

Gas mass flow meter is an instrument for measuring gas flow, which is installed in the pipeline to record the amount of gas flowing through. It can measure blast furnace gas flow meter, coke oven gas mass flow meter, coal gas, air, nitrogen, acetylene, hydrogen, natural gas, etc.

The inventors have found through research that the mass flowmeter in the prior art has the problems of complex structure and low flow sensing sensitivity.

Utility Model Content

The utility model aims to provide a gas mass flowmeter and a gas flow measurement system, which can place the rectifying channel on the rectifying part in the air flow channel to realize small flow real gas test with high flow detection accuracy.

The embodiment of the utility model is achieved as follows:

In a first aspect, the utility model provides a gas mass flow meter, comprising:

A tube body, the tube body having a first accommodating cavity and an air flow channel for gas circulation;

The sensor assembly includes a rectifier, a measuring part, an extension part, a sealing plate and a lead connecting part; the rectifier, the extension part, the sealing plate and the lead connecting part are connected in sequence;

Among them, the rectifying component is placed in the airflow channel, and a rectifying channel is opened on the rectifying component, which is connected to the airflow channel; one end of the measuring component is located in the rectifying channel, and the other end of the measuring component is connected to the lead connector; the sealing plate is connected to the tube body for sealing the first accommodating cavity; the lead connector is located in the first accommodating cavity.

In an optional embodiment, the sensor assembly further comprises a contraction section, a measurement section and an expansion section connected in sequence; the rectifying channel has an inlet and an outlet;

The measuring piece is located in the measuring section, the channel area of the contraction section gradually decreases from the inlet to the outlet, and the channel area of the expansion section gradually increases from the inlet to the outlet.

In an optional embodiment, the measuring element includes a conductive rod and a MEMS flow chip, one end of the conductive rod is connected to the lead connector, the other end of the conductive rod is located in the rectifying channel and is provided with a mounting groove, and the MEMS flow chip is mounted in the mounting groove;

The rectifier, the extension, the sealing plate and the lead connector are provided with interconnecting mounting holes, and the conductive rod is located in the mounting holes;

Among them, the center line of the mounting hole is perpendicular to the center line of the rectifying channel. One end of the mounting hole located in the lead connector is a potting cavity, which is used to inject glue to isolate the rectifying channel from the outside of the airflow channel.

In an optional embodiment, a sealing groove is provided on the side wall of the potting cavity, and the sealing groove is annular and perpendicular to the center line of the conductive rod.

In an optional embodiment, a glue-stop groove is provided at the position of the mounting hole in the extension piece. The glue-stop groove is annular and perpendicular to the center line of the conductive rod. The glue-stop groove is used to prevent the glue in the potting cavity from flowing toward the direction of the rectifying channel.

In an optional embodiment, the gas mass flow meter further includes a control module, which is accommodated in the first accommodating cavity and electrically connected to the measuring component for receiving an analog signal transmitted by the measuring component and converting the analog signal into a digital signal.

In an optional embodiment, the gas mass flow meter further includes a display module, which is accommodated in the first accommodating cavity and is electrically connected to the control module for receiving and displaying digital signals transmitted by the control module.

In an optional embodiment, the tube body further has a second accommodating cavity, and the second accommodating cavity is used to accommodate the battery assembly.

In an optional embodiment, the gas mass flow meter further includes a rectifier assembly, which is connected to the tube body and disposed at one end of the air flow channel.

In a second aspect, the utility model provides a gas flow measurement system, including a filter, a front straight pipe, a rear straight pipe and the aforementioned gas mass flow meter, wherein the filter, the front straight pipe, the airflow channel and the rear straight pipe are connected in sequence.

The beneficial effects of the embodiments of the utility model are:

The gas mass flow meter includes a tube body and a sensor assembly, wherein the tube body has a first accommodating cavity and an airflow channel for gas circulation; the sensor assembly includes a rectifying component, a measuring component, an extending component, a sealing plate and a lead connecting component; the rectifying component, the extending component, the sealing plate and the lead connecting component are connected in sequence; wherein the rectifying component is placed in the airflow channel, a rectifying channel is provided on the rectifying component, and the rectifying channel is connected to the airflow channel; one end of the measuring component is located in the rectifying channel, and the other end of the measuring component is connected to the lead connecting component; the sealing plate is connected to the tube body for sealing the first accommodating cavity; the lead connecting component is located in the first accommodating cavity.

The gas mass flow meter places a rectifying channel in the gas flow channel, so that the gas flowing through the chip is reduced and the gas is more stable, thereby making the measurement of gas flow more accurate.

The gas flow measurement system comprises a filter, a front straight pipe, a rear straight pipe and the above-mentioned gas mass flow meter, wherein the filter, the front straight pipe, the air flow channel and the rear straight pipe are connected in sequence. The gas flow measurement system has all the functions of the above-mentioned gas mass flow meter.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of the structure of a gas measurement system provided by an embodiment of the utility model;

FIG2 is a schematic structural diagram of a gas mass flow meter provided by an embodiment of the utility model from a first viewing angle;

FIG3 is a schematic structural diagram of a gas mass flow meter provided by an embodiment of the utility model from a second viewing angle;

Fig. 4 is a cross-sectional view of the A-A position in Fig. 3;

FIG5 is a schematic structural diagram of a sensor assembly provided by an embodiment of the present utility model at a first viewing angle;

FIG6 is a schematic diagram of the structure of the sensor assembly provided by an embodiment of the present utility model at a second viewing angle;

FIG7 is a cross-sectional view taken along line B-B in FIG6 .

Icons: 100-gas mass flowmeter; 110-tube body; 111-air flow channel; 112-first accommodating chamber; 113-second accommodating chamber; 120-sensor assembly; 121-rectifier; 122-measuring piece; 123-extension piece; 124-sealing plate; 125-lead connector; 126-rectifier channel; 127-contraction section; 128-measuring section; 129-expansion section; 131-conductive rod; 132-MEMS flow chip; 133-mounting hole; 134-potting chamber; 135-sealing groove; 136-glue stop groove; 140-control module; 150-display module; 160-battery assembly; 170-rectifier assembly; 200-filter; 300-front straight pipe; 400-rear straight pipe; 500-gas flow measurement system.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Generally, the components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition and explanation in the subsequent drawings.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Please refer to Figure 1, which is a structural schematic diagram of the gas measurement system provided in an embodiment of the utility model. Specifically, the gas flow measurement system 500 includes a gas mass flow meter 100, a filter 200, a front straight pipe 300 and a rear straight pipe 400, and the filter 200, the front straight pipe 300, the airflow channel 111 and the rear straight pipe 400 are connected in sequence.

The gas mass flow meter 100 is described in detail below:

Please refer to Figures 2-4, Figure 2 is a structural schematic diagram of the gas mass flowmeter 100 provided in an embodiment of the utility model under a first viewing angle; Figure 3 is a structural schematic diagram of the gas mass flowmeter 100 provided in an embodiment of the utility model under a second viewing angle; Figure 4 is a cross-sectional view at A-A in Figure 3.

In order to improve the accuracy of flow detection, the gas mass flowmeter 100 provided in this embodiment includes a tube body 110 and a sensor assembly 120, the tube body 110 has a first accommodating cavity 112 and an airflow channel 111 for gas circulation; the sensor assembly 120 includes a rectifying member 121, a measuring member 122, an extension member 123, a sealing plate 124 and a lead connector 125; the rectifying member 121, the extension member 123, the sealing plate 124 and the lead connector 125 are connected in sequence; wherein the rectifying member 121 is placed in the airflow channel 111, and a rectifying channel 126 is provided on the rectifying member 121, and the rectifying channel 126 is connected to the airflow channel 111; one end of the measuring member 122 is located in the rectifying channel 126, and the other end of the measuring member 122 is connected to the lead connector 125; the sealing plate 124 is connected to the tube body 110, and is used to seal the first accommodating cavity 112; the lead connector 125 is located in the first accommodating cavity 112.

Specifically, the rectifying member 121, the extension member 123, the sealing plate 124 and the lead connector 125 are connected in sequence, wherein the extension member 123 and the lead connector 125 are coaxially arranged, and the connection plane of the sealing plate 124 is perpendicular to the axis of the extension member 123 and the lead connector 125. The sealing plate 124 is provided with screw holes, and the sealing plate 124 is used to be sealed and connected to the tube body 110, thereby isolating the first accommodating cavity 112 and the gas channel, and also preventing external gas from entering the gas flow channel 111 to affect the measurement structure. At the same time, connecting the sealing plate 124 to the tube body 110 avoids frequent disassembly, which is conducive to improving the reliability of the sensor assembly 120 test.

The rectifying member 121 includes a rectifying cover plate and a rectifying body, and the rectifying cover plate and the rectifying body are connected by screws. A rectifying channel 126 is provided on the rectifying member 121, and the rectifying channel 126 is connected to the gas flow channel 111, and is used to rectify the gas; the measuring member 122 is inserted into the rectifying channel 126, and the measuring member 122 is used to count the flow of the gas. In a thermal gas meter with a large flow, the rectifying channel 126 is used to realize a small flow real gas test, and the flow detection accuracy is high; the lead connector 125 is used to connect an external lead, so that the lead is connected to the measuring member 122.

In this embodiment, to ensure the consistency of gas flow in the airflow channel 111 and the rectifying channel 126, the axis of the airflow channel 111 coincides with the axis of the rectifying channel 126. In other embodiments, the specific position of the rectifying channel 126 relative to the airflow channel 111 can be adjusted according to actual needs.

The working principle of the gas mass flow meter 100 is as follows:

By setting up the rectifying channel 126, the large-flow gas in the airflow channel 111 is converted into a small-flow gas, and the flow of the gas in the rectifying channel 126 is measured by the measuring device 122, so as to obtain a more accurate measurement result, avoiding the error caused by the unstable gas flow in the airflow channel 111 and the reduced sensitivity of the measuring device 122 caused by the unstable gas flow.

Further, please refer to Figures 5 to 7. Figure 5 is a schematic diagram of the structure of the sensor assembly 120 provided in the embodiment of the utility model under the first viewing angle; Figure 6 is a schematic diagram of the structure of the sensor assembly 120 provided in the embodiment of the utility model under the second viewing angle; Figure 7 is a cross-sectional view at B-B in Figure 6. The sensor assembly 120 also includes a contraction section 127, a measuring section 128 and an expansion section 129 connected in sequence, the measuring member 122 is located in the measuring section 128, the rectifying channel 126 has an inlet and an outlet, the channel area of the contraction section 127 gradually decreases from the inlet to the outlet, and the channel area of the expansion section 129 gradually increases from the inlet to the outlet. It should be noted that the gas flows from the inlet of the rectifying channel 126 to the outlet of the rectifying channel 126.

It can be understood that by providing the contraction section 127, the measuring section 128 and the expansion section 129, when the gas flows from the contraction section 127 through the measuring section 128, the gas flow channel gradually decreases, thereby forming a stable flowing gas, thereby improving the stability of the gas when passing through the measuring piece 122 and the signal strength of the flow rate, and improving the accuracy of the measuring piece 122 in measuring the flow rate.

In this embodiment, the contraction section 127 and the expansion section 129 are both elliptical horn channels, and the contraction section 127 and the expansion section 129 are oriented in opposite directions. In other embodiments, the inlet and outlet of the rectifying channel 126 may also be circular, and the length and size of the rectifying channel 126 may be flexibly set as needed.

Further, please refer to Figures 5-7. The measuring part 122 includes a conductive rod 131 and a MEMS flow chip 132. The measuring part 122 includes a conductive rod 131 and a MEMS flow chip 132. One end of the conductive rod 131 is connected to the lead connector 125, and the other end of the conductive rod 131 is located in the rectifying channel 126 and is provided with a mounting groove, and the MEMS flow chip 132 is installed in the mounting groove; the rectifying part 121, the extension part 123, the sealing plate 124 and the lead connector 125 are provided with a connected mounting hole 133, and the conductive rod 131 is located in the mounting hole 133; wherein the center line of the mounting hole 133 is perpendicular to the center line of the rectifying channel 126, and one end of the mounting hole 133 located in the lead connector 125 is a potting cavity 134, and the potting cavity 134 is used to pour glue to isolate the rectifying channel 126 from the outside of the airflow channel 111.

Specifically, the MEMS flow chip 132 is installed in the installation groove and is located at the center of the rectifying channel 126, so that when the gas is accelerated through the contraction section 127 to form a stable flow gas and enters the measuring section 128, the flow size is sensed by the MEMS flow chip 132, and then flows out through the expansion section 129. It can be understood that in this embodiment, the flow size of the gas is measured by the MEMS flow chip 132, and the MEMS chip is set at the center of the rectifying channel 126, so that the measured flow is more accurate, and the measurement accuracy is improved.

According to the above configuration, a sealing groove 135 is provided on the side wall of the potting cavity 134. The sealing groove 135 is annular and perpendicular to the center line of the conductive rod 131. There can be multiple sealing grooves 135. In this embodiment, there are two sealing grooves 135, which can improve the overall compressive strength.

According to the above content, a glue stop groove 136 is opened at the position of the mounting hole in the extension piece 123. The glue stop groove 136 is annular and perpendicular to the center line of the conductive rod 131. The glue stop groove 136 is used to prevent the glue in the encapsulation cavity 134 from flowing in the direction of the rectifying channel 126.

Furthermore, the gas mass flow meter 100 also includes a control module 140 , which is accommodated in the first accommodating chamber 112 and electrically connected to the measuring element 122 for receiving an analog signal transmitted by the measuring element 122 and converting the analog signal into a digital signal.

Specifically, when the MEMS measuring chip in the measuring element 122 measures the gas flow rate, an analog electrical signal is generated, and the analog signal is transmitted to the control module 140 through the conductive rod 131, and the control module 140 converts the analog signal into a digital signal.

According to the above configuration, the gas mass flow meter 100 also includes a display module 150, which is accommodated in the first accommodating chamber 112, and the display module 150 is electrically connected to the control module 140, for receiving the digital signal transmitted by the control module 140; and displaying the measured gas flow rate through the LED display screen on the display module 150.

Furthermore, the tube body 110 also has a second accommodating cavity 113, and the second accommodating cavity 113 is used to accommodate a battery assembly 160. The battery assembly 160 is connected to the sensor assembly 120, the control module 140 and the display module 150, and supplies power to the sensor assembly 120, the control module 140 and the display module 150 to ensure the normal operation of the gas mass flow meter 100.

Furthermore, the gas mass flow meter 100 further includes a rectifier assembly 170, which is connected to the tube body 110 and disposed at one end of the airflow channel 111. It should be noted that the gas enters the airflow channel 111 from one end where the rectifier assembly 170 is located, and flows out from the other end of the airflow channel 111; wherein the rectifier channel 126 is disposed away from the rectifier assembly, so that after the gas passes through the rectifier assembly 170, the gas flows at a distance from one end to ensure the stability of the gas flow.

In summary, the gas mass flow meter 100 adopts the principle of shunting and places the rectifying channel 126 in the air flow channel 111, so that the gas flowing through the chip is reduced and the gas is more stable, thereby making the measurement of the gas flow more accurate. By setting the sealing plate 124, it is prevented that the outside air enters the rectifying channel 126 to affect the measurement structure and the gas in the rectifying channel 126 is prevented from entering the first accommodating chamber 112. At the same time, the sealing plate 124 is connected to the tube body 110, so that it does not need to be frequently disassembled, which is conducive to improving the reliability of the gas mass flow meter 100 test. The MEMS flow chip 132 is arranged on the axis of the rectifying channel 126 to ensure the consistency of the flow signal. The contraction section 127, the measurement section 128 and the expansion section 129 are arranged to improve the strength of the flow signal and the stability of the flowing gas. The analog signal transmitted by the MEMS chip is converted into a digital signal by the control module 140, and the measurement result is displayed by the display module 150. The stability of the gas in the air flow channel 111 is improved by the rectifier assembly 170.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. A gas mass flow meter, comprising: A tube body (110), wherein the tube body (110) has a first accommodating cavity (112) and an air flow channel (111) for gas circulation; A sensor assembly (120), the sensor assembly (120) comprising a rectifying component (121), a measuring component (122), an extending component (123), a sealing plate (124) and a lead connecting component (125); the rectifying component (121), the extending component (123), the sealing plate (124) and the lead connecting component (125) are connected in sequence; The rectifying component (121) is placed in the airflow channel (111); a rectifying channel (126) is provided on the rectifying component (121); the rectifying channel (126) is communicated with the airflow channel (111); one end of the measuring component (122) is located in the rectifying channel (126); the other end of the measuring component (122) is connected to the lead connector (125); the sealing plate (124) is connected to the tube body (110) and is used for sealing the first accommodating cavity (112); the lead connector (125) is located in the first accommodating cavity (112). 2. A gas mass flow meter according to claim 1, characterized in that the sensor assembly (120) further comprises a contraction section (127), a measurement section (128) and an expansion section (129) connected in sequence; the rectifying channel (126) has an inlet and an outlet; The measuring member (122) is located in the measuring section (128), the channel area of the contraction section (127) gradually decreases from the inlet to the outlet, and the channel area of the expansion section (129) gradually increases from the inlet to the outlet. 3. A gas mass flow meter according to claim 1, characterized in that the measuring element (122) comprises a conductive rod (131) and a MEMS flow chip (132), one end of the conductive rod (131) is connected to the lead connector (125), the other end of the conductive rod (131) is located in the rectifying channel (126) and is provided with a mounting groove, and the MEMS flow chip (132) is mounted in the mounting groove; The rectifying member (121), the extending member (123), the sealing plate (124) and the lead connecting member (125) are provided with connecting holes (133) that are connected to each other, and the conductive rod (131) is located in the connecting hole (133); The center line of the mounting hole (133) and the center line of the rectifying channel (126) are perpendicular to each other, and one end of the mounting hole (133) located in the lead connector (125) is a potting cavity (134), and the potting cavity (134) is used for pouring glue to isolate the rectifying channel (126) from the outside of the airflow channel (111). 4. A gas mass flow meter according to claim 3, characterized in that a sealing groove (135) is provided on the side wall of the potting cavity (134), and the sealing groove (135) is annular and perpendicular to the center line of the conductive rod (131). 5. A gas mass flow meter according to claim 3, characterized in that a glue-stopping groove (136) is provided at a position where the mounting hole (133) is located in the extension piece (123), and the glue-stopping groove (136) is annular and perpendicular to the center line of the conductive rod (131), and the glue-stopping groove (136) is used to prevent the glue in the encapsulation cavity (134) from flowing in the direction where the rectifying channel (126) is located. 6. The gas mass flow meter according to any one of claims 1 to 5 is characterized in that the gas mass flow meter (100) further includes a control module (140), the control module (140) is accommodated in the first accommodating cavity (112), and the control module (140) is electrically connected to the measuring element (122) for receiving an analog signal transmitted by the measuring element (122) and converting the analog signal into a digital signal. 7. The gas mass flow meter according to claim 6 is characterized in that the gas mass flow meter (100) also includes a display module (150), the display module (150) is accommodated in the first accommodating cavity (112), and the display module (150) is electrically connected to the control module (140) for receiving and displaying the digital signal transmitted by the control module (140). 8. The gas mass flow meter according to any one of claims 1 to 5, characterized in that the tube body (110) further comprises a second accommodating cavity (113), and the second accommodating cavity (113) is used to accommodate a battery assembly (160). 9. The gas mass flow meter according to any one of claims 1 to 5, characterized in that the gas mass flow meter (100) further comprises a rectifier assembly (170), wherein the rectifier assembly (170) is connected to the tube body (110) and is arranged at one end of the airflow channel (111). 10. A gas flow measurement system, characterized in that it comprises a filter (200), a front straight pipe (300), a rear straight pipe (400) and a gas mass flow meter (100) as described in any one of claims 1 to 9, wherein the filter (200), the front straight pipe (300), the air flow channel (111) and the rear straight pipe (400) are connected in sequence.