Gas mass flowmeter

Abstract

The utility model discloses a gas mass flow meter which comprises a flange pipe fitting, a base, a shell, a packaging sleeve, a sensor electrical connection component and a flow sensor. The shell is detachably connected with the base, and a built-in cavity is defined by the shell and the base; the packaging sleeve is fixed on the shell; the sensor electrical connection part is arranged in the built-in cavity in a penetrating manner; the flow sensor is positioned in the built-in cavity and is detachably connected with the sensor electrical connection component; a flow detection inlet and a flow detection outlet are formed in the base; a pressure balance hole is formed in the base, one end of the pressure balance hole is communicated with the pipe cavity, and the other end of the pressure balance hole is communicated with the built-in cavity. According to the utility model, the pressure bearing problem of the flow sensor can be solved, the flow sensor does not need to be packaged, the disassembly difficulty of the flow sensor can be reduced, sol treatment is not needed, and the disassembly of the flow sensor is relatively convenient and rapid.

Description

Technical Field

[0001] The utility model relates to the field of flow meters, in particular to a gas mass flow meter. Background Art

[0002] As an instrument for measuring the flow rate of a medium, gas mass flowmeters are widely used in industrial production, environmental monitoring, energy management and other fields. Gas mass flowmeters used in micro-electromechanical systems often include a housing and a flow sensor. In order to solve the pressure problem of the flow sensor, the flow sensor needs to be packaged in the housing with high-pressure sealant. Although it makes the production simple and convenient, if the flow sensor fails, it is difficult to disassemble the flow sensor, which makes it time-consuming to disassemble and inconvenient to repair and replace the flow sensor. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a gas mass flow meter, which can solve the pressure problem of the flow sensor and does not require packaging the flow sensor, thereby reducing the difficulty of disassembling the flow sensor, making the disassembly of the flow sensor more convenient and quick, thereby improving the disassembly efficiency of the flow sensor and facilitating the maintenance and replacement of the flow sensor.

[0004] The purpose of the utility model is achieved by the following technical solutions:

[0005] A gas mass flowmeter, comprising a flange pipe, a base, a shell, a packaging sleeve, a sensor electrical connection component and a flow sensor; the flange pipe is provided with a tube cavity; the base is arranged on the flange pipe; the shell is connected to the base in a detachable manner, and the shell and the base form a built-in cavity; the packaging sleeve is fixed on the shell; the sensor electrical connection component is arranged on the packaging sleeve and penetrates into the built-in cavity; the flow sensor is located in the built-in cavity and is connected to the sensor electrical connection component in a detachable manner; a flow detection inlet and a flow detection outlet are provided on the base; the flow detection inlet is connected to the tube cavity of the flange pipe, and the flow detection inlet is used to guide the gas to the flow sensor; one end of the flow detection outlet is connected to the tube cavity of the flange pipe, and the other end faces the flow sensor; a pressure balance hole is provided on the base, one end of the pressure balance hole is connected to the tube cavity, and the other end is connected to the built-in cavity.

[0006] The sensor electrical connection component includes a sensor connection line and a sensor connection terminal; the sensor connection terminal is connected to the sensor connection line; and the flow sensor is connected to the sensor connection terminal in a detachable manner.

[0007] The packaging sleeve is provided with a packaging cavity, and the sensor connecting line includes a first line segment and a second line segment arranged in sequence; the first line segment is packaged in the packaging cavity; the second line segment is located outside the packaging cavity and passes through the built-in cavity; the sensor connecting terminal is connected to an end of the second line segment away from the first line segment.

[0008] The shell comprises a main shell and an external seat; the main shell is connected to the base in a detachable manner; the external seat is arranged on an end of the main shell away from the base.

[0009] The packaging sleeve includes an end seat and a penetrating tube body; the penetrating tube body is arranged on the end seat, and the packaging cavity extends from the end seat to the penetrating tube body; the external seat is provided with a mounting groove and a connecting groove; one end of the connecting groove is connected to the mounting groove, and the other end is connected to the built-in cavity; the end seat is installed in the mounting groove, and the penetrating tube body is penetrated in the connecting groove and the built-in cavity.

[0010] A gasket and a fixing sleeve are sequentially arranged in the installation groove along the direction close to the base; the end seat is limited between the fixing sleeve and the gasket; a penetration hole is arranged on the gasket, and the penetration tube body is also penetrated in the penetration hole; the fixing sleeve is threadedly connected in the installation groove.

[0011] One end of the sensor connection line away from the sensor connection terminal extends out of the shell and is connected to the mainboard connection terminal.

[0012] The flow detection inlet, the flow detection outlet, and the pressure balance hole are sequentially arranged on the base along the axial direction of the tube cavity.

[0013] The flow sensor is detachably fixed on the base.

[0014] The gas mass flowmeter also includes an airflow guide ring; the portion of the flange pipe cavity between the flow detection inlet and the flow detection outlet is formed as a ring-mounted cavity section; the airflow guide ring is arranged in the ring-mounted cavity section; and a plurality of vents are arranged on the airflow guide ring.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The utility model provides a gas mass flow meter, which reasonably arranges flange pipe fittings, a base, a shell, a packaging sleeve, a sensor electrical connection component and a flow sensor, and arranges a pressure balance hole on the base, so that the gas in the tube cavity can gradually enter the built-in cavity through the pressure balance hole, so that the pressure in the built-in cavity gradually increases, which can solve the pressure problem of the flow sensor without packaging the flow sensor, reduce the difficulty of disassembling the flow sensor, and do not need to perform sol treatment, so that the disassembly of the flow sensor is more convenient and quick, so as to improve the disassembly efficiency of the flow sensor and facilitate the maintenance and replacement of the flow sensor; moreover, it can reduce the damage caused by pipeline impurities to the flow sensor, so as to effectively extend the service life of the flow sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a cross-sectional view of the utility model;

[0019] Figure 3 It is a schematic diagram of the matching between the electrical connection component of the sensor and the packaging sleeve;

[0020] Among them, 1. flange pipe fittings; 2. air flow guide ring; 3. base; 4. flow detection inlet; 5. flow detection outlet; 6. flow sensor; 7. sensor connection terminal; 8. sensor connection line; 9. epoxy resin layer; 10. main shell; 11. gasket; 12. packaging sleeve; 13. fixed sleeve; 14. main board connection terminal; 15. external seat; 16. shell; 17. sensor electrical connection component; 18. end seat; 19. through-tube body; 21. first line segment; 22. second line segment; 23. tube cavity; 24. built-in cavity; 25. packaging cavity; 26. installation groove; 27. connecting groove; 28. pressure balance hole. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0022] like Figure 1-3As shown, a gas mass flowmeter includes a flange pipe 1, a base 3, a shell 16, a packaging sleeve 12, a sensor electrical connection component 17 and a flow sensor 6; the flange pipe 1 is provided with a tube cavity 23; the base 3 is arranged on the flange pipe 1; the shell 16 is connected to the base 3 in a detachable manner, and the shell 16 and the base 3 form a built-in cavity 24; the packaging sleeve 12 is fixed on the shell 16; the sensor electrical connection component 17 is arranged on the packaging sleeve 12 and penetrates into the built-in cavity 24; the flow sensor 6 is located in the built-in cavity 2 4, and is connected to the sensor electrical connection component 17 in a detachable manner; a flow detection inlet 4 and a flow detection outlet 5 are provided on the base 3; the flow detection inlet 4 is connected to the tube cavity 23 of the flange pipe fitting 1, and the flow detection inlet 4 is used to guide the gas to the flow sensor 6; one end of the flow detection outlet 5 is connected to the tube cavity 23 of the flange pipe fitting 1, and the other end faces the flow sensor 6; a pressure balance hole 28 is provided on the base 3, one end of the pressure balance hole 28 is connected to the tube cavity 23, and the other end is connected to the built-in cavity 24.

[0023] When in use, the gas flowing into the flange pipe fitting 1 can flow to the flow sensor 6 through the flow detection inlet 4, and after the flow sensor 6 detects the flow, it flows back from the flow detection outlet 5 to the tube cavity 23 of the flange pipe fitting 1. Moreover, by providing a pressure balance hole 28 on the base 3, the gas in the tube cavity 23 can gradually enter the built-in cavity 24 through the pressure balance hole 28, so that the pressure in the built-in cavity 24 gradually increases to a state of pressure balance with the tube cavity 23, thereby avoiding damage to the flow sensor 6 due to a sudden increase in the pressure in the built-in cavity 24, and solving the pressure bearing problem of the flow sensor 6 without packaging the flow sensor 6. When the flow sensor 6 fails, the shell 16 can be disassembled from the base 3, and then the flow sensor 6 and the sensor electrical connection component 17 can be disassembled, and the flow sensor 6 can be removed to complete the disassembly of the flow sensor 6. Therefore, there is no need to perform sol treatment, which can reduce the difficulty of disassembly of the flow sensor 6, making the disassembly of the flow sensor 6 more convenient and quick, and can reduce the disassembly time of the flow sensor 6, so as to improve the disassembly efficiency of the flow sensor 6 and facilitate the maintenance and replacement of the flow sensor 6.

[0024] The sensor electrical connection component 17 includes a sensor connection line 8 and a sensor connection terminal 7; the sensor connection terminal 7 is connected to the sensor connection line 8; and the flow sensor 6 is detachably connected to the sensor connection terminal 7. By adopting the above arrangement, the connection between the flow sensor 6 and the sensor electrical connection component 17 can be facilitated.

[0025] The packaging sleeve 12 is provided with a packaging cavity 25, and the sensor connecting wire 8 includes a first line segment 21 and a second line segment 22 arranged in sequence; the first line segment 21 is packaged in the packaging cavity 25; the second line segment 22 is located outside the packaging cavity 25 and penetrates the built-in cavity 24; the sensor connecting terminal 7 is connected to the end of the second line segment 22 away from the first line segment 21. By packaging the first line segment 21 of the sensor connecting wire 8 in the packaging cavity 25, the airflow is prevented from leaking from the inside of the sensor connecting wire 8, and the pressure bearing capacity can be improved. Since the flow sensor 6 is not packaged, only the sensor connecting wire 8 needs to be pressure tested, and even if there is leakage after packaging, it will not cause damage to the flow sensor 6. Specifically, the first line segment 21 can be packaged in the packaging cavity 25 by an epoxy resin layer 9 or the like.

[0026] The housing 16 includes a main housing 10 and an external seat 15; the main housing 10 is detachably connected to the base 3; the external seat 15 is disposed on an end of the main housing 10 away from the base 3. By adopting the above structure, the housing 16 can be easily manufactured.

[0027] The packaging sleeve 12 includes an end seat 18 and a penetration tube body 19; the penetration tube body 19 is disposed on the end seat 18, and the packaging cavity 25 extends from the end seat 18 to the penetration tube body 19. By adopting the above structure, the packaging sleeve 12 can be easily manufactured.

[0028] The external seat 15 is provided with a mounting groove 26 and a connecting groove 27; one end of the connecting groove 27 is connected to the mounting groove 26, and the other end is connected to the internal cavity 24; the end seat 18 is installed in the mounting groove 26, and the penetrating tube body 19 is penetrated in the connecting groove 27 and the internal cavity 24. By adopting the above arrangement, the installation of the packaging sleeve 12 can be facilitated.

[0029] The installation groove 26 is provided with a gasket 11 and a fixed sleeve 13 in sequence along the direction close to the base 3; the end seat 18 is limited between the fixed sleeve 13 and the gasket 11; the gasket 11 is provided with a through hole, and the through tube body 19 is also through the through hole. The fixed sleeve 13 is threadedly connected in the installation groove 26. During the installation process, the gasket 11 can be placed in the installation groove 26 first, and then the end seat 18 of the packaging sleeve 12 can be placed on the gasket 11. At this time, the through tube body 19 is through the through hole, the connecting groove 27 and the built-in cavity 24 of the gasket 11, and then the fixed sleeve 13 is threadedly connected in the installation groove 26, and the fixed sleeve 13 is used to press against the end seat 18, so that the end seat 18 is limited between the fixed sleeve 13 and the gasket 11, and the above structure can facilitate the installation of the packaging sleeve 12.

[0030] Specifically, the cross-sectional area of ​​the installation groove 26 is greater than the cross-sectional area of ​​the communicating groove 27 , and the bottom wall of the installation groove 26 is formed as abutment wall for the gasket 11 to abut against.

[0031] One end of the sensor connection line 8 away from the sensor connection terminal 7 extends out of the housing 16 and is connected to the mainboard connection terminal 14. When in use, the mainboard connection terminal 14 can be connected to an external mainboard.

[0032] The flow detection inlet 4 , the flow detection outlet 5 , and the pressure balance hole 48 are sequentially arranged on the base 3 along the axial direction of the tube cavity 23 .

[0033] In actual design, the flow sensor 6 can also be detachably fixed on the base 3 to improve the installation stability of the flow sensor 6. Specifically, the flow sensor 6 is fixed on the base 3 by bolts, clamping, etc.

[0034] The gas mass flow meter further includes an airflow guide ring 2; the portion of the lumen 23 of the flange pipe 1 between the flow detection inlet 4 and the flow detection outlet 5 is formed as a ring-mounting cavity section; the airflow guide ring 2 is arranged in the ring-mounting cavity section; and a plurality of vents are arranged on the airflow guide ring 2. When in use, pipeline impurities can flow to the vents of the airflow guide ring 2 along with the gas, so as to reduce the pipeline impurities from entering the flow sensor 6 through the flow detection inlet 4, and can reduce the damage caused by pipeline impurities to the flow sensor 6, so as to effectively extend the service life of the flow sensor 6.

[0035] In this embodiment, the housing 16 is connected to the base 3 by screws. Specifically, the base 3 is provided with a threaded hole, the housing 16 is provided with a through hole, the screw is passed through the through hole and connected with the threaded hole, so as to facilitate the disassembly and connection between the housing 16 and the base 3. Of course, in addition to this, the housing 16 can also be connected to the base 3 by means of a buckle or the like, as long as the housing 16 can be connected to the base 3 in a detachable manner.

[0036] Among them, the gas mass flow meter can be used in fields such as micro-electromechanical systems according to usage requirements.

[0037] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A gas mass flow meter, characterized in that: It includes a flange pipe fitting, a base, a shell, a packaging sleeve, a sensor electrical connection component and a flow sensor; the flange pipe fitting is provided with a tube cavity; the base is arranged on the flange pipe fitting; the shell is connected to the base in a detachable manner, and the shell and the base form a built-in cavity; the packaging sleeve is fixed on the shell; the sensor electrical connection component is arranged on the packaging sleeve and penetrates into the built-in cavity; the flow sensor is located in the built-in cavity and is connected to the sensor electrical connection component in a detachable manner; a flow detection inlet and a flow detection outlet are arranged on the base; the flow detection inlet is connected to the tube cavity of the flange pipe fitting, and the flow detection inlet is used to guide the gas to the flow sensor; one end of the flow detection outlet is connected to the tube cavity of the flange pipe fitting, and the other end faces the flow sensor; a pressure balance hole is arranged on the base, one end of the pressure balance hole is connected to the tube cavity, and the other end is connected to the built-in cavity.

2. The gas mass flow meter according to claim 1, characterized in that: The sensor electrical connection component includes a sensor connection line and a sensor connection terminal; the sensor connection terminal is connected to the sensor connection line; and the flow sensor is connected to the sensor connection terminal in a detachable manner.

3. The gas mass flow meter according to claim 2, characterized in that: The packaging sleeve is provided with a packaging cavity, and the sensor connecting line includes a first line segment and a second line segment arranged in sequence; the first line segment is packaged in the packaging cavity; the second line segment is located outside the packaging cavity and passes through the built-in cavity; the sensor connecting terminal is connected to an end of the second line segment away from the first line segment.

4. The gas mass flow meter according to claim 3, characterized in that: The shell comprises a main shell and an external seat; the main shell is connected to the base in a detachable manner; the external seat is arranged on an end of the main shell away from the base.

5. The gas mass flow meter according to claim 4, characterized in that: The packaging sleeve includes an end seat and a penetrating tube body; the penetrating tube body is arranged on the end seat, and the packaging cavity extends from the end seat to the penetrating tube body; the external seat is provided with a mounting groove and a connecting groove; one end of the connecting groove is connected to the mounting groove, and the other end is connected to the built-in cavity; the end seat is installed in the mounting groove, and the penetrating tube body is penetrated in the connecting groove and the built-in cavity.

6. The gas mass flow meter according to claim 5, characterized in that: A gasket and a fixing sleeve are sequentially arranged in the installation groove along the direction close to the base; the end seat is limited between the fixing sleeve and the gasket; a penetration hole is arranged on the gasket, and the penetration tube body is also penetrated in the penetration hole; the fixing sleeve is threadedly connected in the installation groove.

7. The gas mass flow meter according to claim 2, characterized in that: One end of the sensor connection line away from the sensor connection terminal extends out of the shell and is connected to the mainboard connection terminal.

8. The gas mass flow meter according to claim 1, characterized in that: The flow detection inlet, the flow detection outlet, and the pressure balance hole are sequentially arranged on the base along the axial direction of the tube cavity.

9. The gas mass flow meter according to claim 1, characterized in that: The flow sensor is detachably fixed on the base.

10. The gas mass flow meter according to claim 1, characterized in that: The gas mass flowmeter also includes an airflow guide ring; the portion of the flange pipe cavity between the flow detection inlet and the flow detection outlet is formed as a ring-mounted cavity section; the airflow guide ring is arranged in the ring-mounted cavity section; and a plurality of vents are arranged on the airflow guide ring.

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