Thermal type gas mass flow meter

Abstract

The utility model discloses a thermal type gas mass flow meter, and relates to the technical field of flow meters. The flow meter comprises an airflow pipeline, one end of the airflow pipeline is fixedly connected with a connector, one end of the connector is provided with a through hole communicated with the airflow pipeline, a flow meter external body is inserted into the through hole, and one end of the flow meter external body is fixedly connected with a built-in sensor. After a flow meter external body is guided to drive a locking sliding block to be inserted into an L-shaped guide sliding groove, the locking sliding block moves to the position below a locking groove along the interior of the L-shaped guide sliding groove, a jacking assembly is used for pushing the locking sliding block to be embedded into the locking groove in the length direction of a follow-up sliding groove, and then a locking nut is screwed to be in threaded connection with a locking thread; therefore, fixed connection between the flowmeter external body and the airflow pipeline is achieved, the axial movement of the flowmeter external body driving the locking sliding block is limited through the locking groove, and then the stability of the built-in sensor inserted into the airflow pipeline is effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of flow meters, and particularly to a thermal gas mass flow meter. Background Art

[0002] With the rapid development of modern industrial technology, the requirements for the accuracy and reliability of gas flow measurement are becoming increasingly strict. Against this background, the thermal gas mass flow meter has become an indispensable important tool in fields such as industrial production, environmental protection, and laboratory research, thanks to its unique thermal diffusion measurement principle, wide application range, and excellent performance.

[0003] The core of the thermal gas mass flow meter lies in its sensor design. The sensor is internally equipped with two standard-level temperature detectors. One serves as a heat source responsible for generating heat, and the other is used to measure the temperature of the fluid. When the gas flows through the sensor, the heat loss of the heat source shows a non-linear relationship with the gas flow rate. The thermal gas mass flow meter precisely utilizes this relationship and converts it into a linear output of the measured flow signal, thereby achieving accurate measurement of the gas flow rate.

[0004] However, in the traditional flow meter design, the insertion rod is usually fixedly connected to the pipeline through a threaded connection. As a result, when the insertion rod is subjected to the internal pressure of the pipeline, the connection end between the insertion rod and the pipeline is prone to looseness, which in turn affects the overall installation stability of the flow meter and reduces the safety of the device. Summary of the Utility Model

[0005] The purpose of this application is to provide a thermal gas mass flow meter to solve the problem that when the insertion rod is subjected to the internal pressure of the pipeline, the connection end between the insertion rod and the pipeline is prone to looseness, which in turn affects the overall installation stability of the flow meter and reduces the safety of the device.

[0006] To achieve the above purpose, this application specifically adopts the following technical solutions:

[0007] A thermal gas mass flowmeter includes an air flow pipeline. One end of the air flow pipeline is fixedly connected with a connector. One end of the connector is provided with a perforation communicating with the air flow pipeline. A flowmeter external body is inserted into the interior of the perforation. One end of the flowmeter external body is fixedly connected with an internal sensor. The internal sensor is installed inside the air flow pipeline. One end of the flowmeter external body is symmetrically provided with follower chutes. Locking sliders are slidably connected inside the follower chutes. The inner side of the connector is symmetrically provided with L-shaped guiding chutes adapted to the locking sliders. Locking grooves adapted to the locking sliders are provided inside the L-shaped guiding chutes. A locking nut is movably sleeved on one end of the flowmeter external body. A locking thread threadedly connected with the locking nut is provided on the outer side of the connector. A jacking assembly for pushing the locking sliders into the interior of the locking grooves is installed inside the L-shaped guiding chutes.

[0008] By adopting the above technical solution, through the combined use of the jacking assembly and the follower chutes, locking sliders and locking grooves, after guiding the flowmeter external body to drive the locking sliders to insert into the interior of the L-shaped guiding chutes, it is convenient to move along the interior of the L-shaped guiding chutes to the lower part of the locking grooves, and use the jacking assembly to push the locking sliders to be inserted into the interior of the locking grooves along the length direction of the follower chutes. Then, tighten the locking nut and the locking thread to form a threaded connection, thereby realizing the fixed connection between the flowmeter external body and the air flow pipeline, and using the locking grooves to limit the axial movement of the flowmeter external body driving the locking sliders, thus effectively improving the stability of the internal sensor inserted into the interior of the air flow pipeline and enhancing the safety of the device.

[0009] Furthermore, the jacking assembly includes a storage groove opened inside the L-shaped guiding chute. A jacking spring is fixedly connected inside the storage groove. The top of the jacking spring is fixedly connected with an arc-shaped jacking slider. One end of the arc-shaped jacking slider is slidably connected inside the storage groove. The storage groove is arranged directly below the locking groove.

[0010] By adopting the above technical solution, through the combined use of the jacking spring and the arc-shaped jacking slider, when rotating the flowmeter external body to drive the locking sliders to move along the guiding direction of the L-shaped guiding chutes to the lower part of the locking grooves, it is convenient for the locking sliders to push the arc-shaped jacking sliders to compress the jacking spring and retract into the interior of the storage groove. Then, use the resilience characteristic of the jacking spring to push the arc-shaped jacking sliders to eject the locking sliders to be inserted into the interior of the locking grooves along the length direction of the follower chutes, thereby realizing the limitation of the axial movement of the locking sliders along the flowmeter external body and enhancing the installation stability of the device.

[0011] Furthermore, unlocking chutes communicating with the storage groove are symmetrically opened at one end of the connector. One end of the arc-shaped jacking slider is fixedly connected with an unlocking slider. One end of the unlocking slider is slidably connected inside the unlocking chute.

[0012] By adopting the above technical solution, through the combined use of the unlocking chute and the unlocking slider, it is convenient to drive the arc-shaped lifting slider to move downward along the length direction of the unlocking chute by pulling the unlocking slider, and one end of the arc-shaped lifting slider is disengaged from the inside of the L-shaped guiding chute, and the lifting spring is squeezed to generate a contraction deformation. At the same time, the arc-shaped lifting slider is retracted into the inside of the receiving groove, so that the locking slider can be disengaged from the inside of the locking groove along the length direction of the follower chute under the action of gravity and slide into the inside of the L-shaped guiding chute, thereby facilitating the driving of the locking slider to disengage from the inside of the locking groove and improving the practicability of the device.

[0013] Furthermore, a rubber sealing ring is fixedly connected to the inner top of the locking nut, and the rubber sealing ring is in contact with the top of the connecting head.

[0014] By adopting the above technical solution, through the combined use of the locking nut and the rubber sealing ring, it is convenient to utilize the deformation characteristic of the rubber sealing ring to make the rubber sealing ring deform and fill the gap between the locking nut and the connecting head, thereby effectively improving the sealing performance of the device.

[0015] Furthermore, one end of the external body of the flowmeter is fixedly connected with a porous polymer elastic composite sleeve, and the porous polymer elastic composite sleeve is embedded in the inside of the through hole.

[0016] By adopting the above technical solution, through the combined use of the porous polymer elastic composite sleeve with the external body of the flowmeter and the connecting head, the propagation stroke of the vibration and noise generated by the built-in sensor is effectively extended, and the propagation intensity of the vibration force and noise is weakened.

[0017] Furthermore, friction thread grooves are formed on the outer side of the locking nut.

[0018] By adopting the above technical solution, through the combined use of the friction thread grooves and the locking nut, the friction force on the surface of the locking nut is effectively increased, and the stability of screwing the locking nut is improved.

[0019] Furthermore, an expansion groove is formed on the inner side of the unlocking chute, and one end of the unlocking slider extends into the inside of the expansion groove and is fixedly connected with a driving block.

[0020] By adopting the above technical solution, through the combined use of the expansion groove and the driving block, the internal space of the unlocking chute and the contact area with the unlocking slider are effectively expanded, and the practicability of the device is improved.

[0021] Furthermore, a ceramic polymer nano-coating is coated on the surface of the built-in sensor.

[0022] By adopting the above technical solution, the corrosion resistance and service life of the built-in sensor are effectively improved by setting the ceramic polymer nano-coating.

[0023] In summary, the present application includes at least one of the following beneficial effects:

[0024] 1. By setting the cooperation of the jacking component with the follower chute, the locking slider, and the locking groove, it is convenient to move the locking slider along the inner side of the L-shaped guiding chute to below the locking groove after the external body of the flowmeter is guided to drive the locking slider to insert into the inner side of the L-shaped guiding chute, and use the jacking component to push the locking slider to embed into the inner side of the locking groove along the length direction of the follower chute, and then tighten the locking nut and the locking thread to form a threaded connection, so as to realize the fixed connection between the external body of the flowmeter and the air flow pipeline, and use the locking groove to limit the axial movement of the external body of the flowmeter driving the locking slider, thereby effectively improving the stability of the built-in sensor inserted into the inner side of the air flow pipeline and improving the safety of the device.

[0025] 2. By setting the cooperation of the jacking spring and the arc-shaped jacking slider, it is convenient to make the locking slider push the arc-shaped jacking slider to squeeze the jacking spring and retract into the inner side of the receiving groove when rotating the external body of the flowmeter to drive the locking slider to move to below the locking groove along the guiding direction of the L-shaped guiding chute, and then use the resilience characteristic of the jacking spring to push the arc-shaped jacking slider to push out the locking slider to embed into the inner side of the locking groove along the length direction of the follower chute, so as to realize the limitation of the axial movement of the locking slider along the external body of the flowmeter and improve the installation stability of the device. Description of the Drawings

[0026] Figure 1 is the three-dimensional structural schematic diagram of the device main body in the present application.

[0027] Figure 2 is the internal structure explosion diagram of the perforation in the present application.

[0028] Figure 3 is the internal structure sectional view of the perforation in the present application.

[0029] Figure 4 is Figure 3 the enlarged view of part A in

[0030] Figure 5 is the internal structure schematic diagram of the locking nut in the present application.

[0031] Description of the Reference Numerals:

[0032] 1. Airflow pipeline; 2. Connector; 3. Perforation; 4. External body of flowmeter; 5. Built-in sensor; 6. Follow-up sliding groove; 7. Locking slider; 8. L-shaped guiding sliding groove; 9. Locking groove; 10. Locking nut; 11. Locking thread; 12. Storage groove; 13. Lifting spring; 14. Arc-shaped lifting slider; 15. Unlocking sliding groove; 16. Unlocking slider; 17. Rubber sealing ring; 18. Porous polymer elastic composite sleeve; 19. Friction groove; 20. Expansion groove; 21. Driving block. Detailed implementation mode

[0033] The following will further describe the present application in detail with reference to the attached Figures 1-5 drawings.

[0034] The embodiment of the present application discloses a thermal gas mass flowmeter.

[0035] Referring to Figures 1-4 , a thermal gas mass flowmeter includes an airflow pipeline 1. One end of the airflow pipeline 1 is fixedly connected to a connector 2. One end of the connector 2 is provided with a perforation 3 communicating with the airflow pipeline 1. The inside of the perforation 3 is inserted with an external body 4 of the flowmeter. One end of the external body 4 of the flowmeter is fixedly connected to a built-in sensor 5. The built-in sensor 5 is installed inside the airflow pipeline 1. One end of the external body 4 of the flowmeter is symmetrically provided with follow-up sliding grooves 6. The inside of the follow-up sliding grooves 6 is slidably connected with locking sliders 7. The inner side of the connector 2 is symmetrically provided with L-shaped guiding sliding grooves 8 adapted to the locking sliders 7. The inside of the L-shaped guiding sliding grooves 8 is provided with locking grooves 9 adapted to the locking sliders 7. One end of the external body 4 of the flowmeter is movably sleeved with a locking nut 10. The outside of the connector 2 is provided with a locking thread 11 threadedly connected to the locking nut 10. The inside of the L-shaped guiding sliding grooves 8 is provided with a lifting assembly for pushing the locking sliders 7 into the inside of the locking grooves 9;

[0036] Among them, the lifting assembly includes a storage groove 12 opened inside the L-shaped guiding sliding groove 8. The inside of the storage groove 12 is fixedly connected with a lifting spring 13. The top of the lifting spring 13 is fixedly connected with an arc-shaped lifting slider 14. One end of the arc-shaped lifting slider 14 is slidably connected inside the storage groove 12. The storage groove 12 is arranged directly below the locking groove 9;

[0037] Moreover, the outside of the locking nut 10 is provided with a friction groove 19.

[0038] When in use, first pull the flow meter external body 4 to drive the built-in sensor 5 through the perforation 3 and insert it into the interior of the air flow duct 1, and at the same time drive the locking slider 7 to align with the top of the L-shaped guide groove 8, and insert it into the inner side of the perforation 3 along the guiding direction of the L-shaped guide groove 8, and then rotate the flow meter external body 4 to drive the locking slider 7 to move along the guiding direction of the L-shaped guide groove 8 to the bottom of the locking groove 9, and form a conflict with the arc surface lifting slider 14, push the arc surface lifting slider 14 to squeeze the lifting spring 13 to produce a contraction deformation, and at the same time retract into the interior of the storage groove 12, and then rotate the flow meter external body 4 to drive the locking slider 7 to align with the locking groove 9, use the rebound characteristics of the lifting spring 13, so that the lifting spring 13 rebounds and pushes one end of the arc surface lifting slider 14 to push the locking slider 7 along the length of the follower groove 6 The locking nut 10 is then pulled toward the connector 2 along the length direction of the flow meter external body 4, and the locking nut 10 is tightened to form a threaded connection with the locking thread 11. At the same time, the locking nut 10 is arranged to effectively increase the friction between the hand, so that when the built-in sensor 5 is subjected to the internal pressure of the pipeline, the flow meter external body 4 is driven to push the locking slider 7 to move axially, and at the same time, the locking slider 7 is caused to contact with the inner wall of the locking groove 9, thereby effectively improving the stability of the built-in sensor 5 inserted into the airflow pipeline 1, reducing the loosening of the locking nut 10 and the locking thread 11 caused by the built-in sensor 5, enhancing the installation stability of the device, and improving the safety of the device.

[0039] Reference Figure 2 and Figure 4 , an unlocking slide groove 15 connected to the receiving groove 12 is symmetrically opened at one end of the connector 2, an unlocking slide groove 16 is fixedly connected to one end of the arc-surface lifting slide block 14, and one end of the unlocking slide block 16 is slidably connected to the inside of the unlocking slide groove 15;

[0040] An expansion slot 20 is formed inside the unlocking slide slot 15 , and one end of the unlocking slider 16 extends into the expansion slot 20 and is fixedly connected to a driving block 21 .

[0041] During use, when the locking nut 10 is loosened to release the threaded connection with the locking thread 11, the driving block 21 is manually triggered to move along the inner wall of the expansion slot 20, and the driving block 21 drives the unlocking slider 16 to move downward along the length direction of the unlocking chute 15. As a result, the unlocking slider 16 drives the arc-shaped lifting slider 14 to squeeze the lifting spring 13 to generate a contraction deformation. At the same time, the arc-shaped lifting slider 14 disengages from the inside of the L-shaped guiding chute 8 and retracts into the inside of the storage groove 12. Consequently, the locking slider 7 moves downward along the length direction of the follower chute 6 under the action of gravity and slides into the inside of the L-shaped guiding chute 8. Then, the flowmeter external body 4 is rotated to drive the locking slider 7 to move along the inside of the L-shaped guiding chute 8 and disengage from the inside of the through hole 3, thereby facilitating the disconnection of the flowmeter external body 4 from the through hole 3 and effectively improving the practicality of the device.

[0042] Refer to Figure 2 and Figure 5 At the inner top of the locking nut 10, a rubber sealing ring 17 is fixedly connected, and the rubber sealing ring 17 fits against the top of the connecting head 2.

[0043] During use, when the locking nut 10 is tightened to form a threaded connection with the locking thread 11, the locking nut 10 drives the rubber sealing ring 17 to approach one end of the storage groove 12 and squeezes the rubber sealing ring 17 to deform. At the same time, the rubber sealing ring 17 deforms and fills the gap between the locking nut 10 and the connecting head 2, thereby effectively improving the sealing performance of the connection end between the locking nut 10 and the connecting head 2.

[0044] Refer to Figure 2 and Figure 5 At one end of the flowmeter external body 4, a porous polymer elastic composite sleeve 18 is fixedly connected, and the porous polymer elastic composite sleeve 18 is embedded inside the through hole 3.

[0045] During use, when the flowmeter external body 4 is pulled to drive the built-in sensor 5 to pass through the through hole 3 and insert into the airflow pipe 1, the flowmeter external body 4 drives the porous polymer elastic composite sleeve 18 to be embedded inside the through hole 3 and fit against the inner side of the through hole 3. Then, by utilizing the elastic porous characteristics of the porous polymer elastic composite sleeve 18, when the porous polymer elastic composite sleeve 18 vibrates and generates noise due to the internal pressure of the airflow pipe 1 acting on the built-in sensor 5, the travel of the vibration force and noise transmitted to the surface of the connecting head 2 is effectively extended, and the propagation intensity of the vibration force and noise is weakened.

[0046] Refer to Figure 1 and Figure 2 On the surface of the built-in sensor 5, a ceramic polymer nano-coating is applied.

[0047] When in use, a ceramic polymer nano coating is coated on the surface of the built-in sensor 5 so that a corrosion-resistant protective layer is formed on the surface of the built-in sensor 5 , thereby extending the service life and accuracy of the built-in sensor 5 .

[0048] The implementation principle of a thermal gas mass flowmeter in this embodiment is as follows: first, the built-in sensor 5 is driven through the perforation 3 and inserted into the interior of the airflow duct 1 by pulling the flowmeter external body 4, and at the same time, the locking slider 7 is driven to align with the top of the L-shaped guide groove 8, and inserted into the inner side of the perforation 3 along the guiding direction of the L-shaped guide groove 8, and then the flowmeter external body 4 is rotated to drive the locking slider 7 to move to the bottom of the locking groove 9 along the guiding direction of the L-shaped guide groove 8, and form a conflict with the arc-surface lifting slider 14, pushing the arc-surface lifting slider 14 to squeeze the lifting spring 13 to produce a contraction deformation, and at the same time retract into the contraction The inside of the receiving groove 12, and then after the flow meter external body 4 is rotated to drive the locking slider 7 to align with the locking groove 9, the rebound characteristic of the lifting spring 13 is used to make the lifting spring 13 rebound and push one end of the arc lifting slider 14 to push the locking slider 7 to move upward along the length direction of the following slide groove 6, and make one end of the locking slider 7 embedded in the locking groove 9 along the length direction of the following slide groove 6, so that when the built-in sensor 5 is subjected to the internal pressure of the pipeline, the flow meter external body 4 is driven to push the locking slider 7 to move axially, and at the same time, the locking slider 7 is in conflict with the inner wall of the locking groove 9;

[0049] Then, the locking nut 10 is pulled along the length direction of the flow meter external body 4 to move closer to the connector 2, and the locking nut 10 is tightened to form a threaded connection with the locking thread 11, and at the same time, the locking nut 10 drives the rubber sealing ring 17 to move closer to one end of the receiving groove 12, and squeezes the rubber sealing ring 17 to deform, and at the same time, the rubber sealing ring 17 is deformed and fills the gap between the locking nut 10 and the connector 2;

[0050] Then, after loosening the locking nut 10 to release the threaded connection with the locking thread 11, the drive block 21 is manually pressed to move along the inner wall of the expansion slot 20, and the drive block 21 drives the unlocking slider 16 to move downward along the length direction of the unlocking slot 15, so that the unlocking slider 16 drives the arc-surface lifting slider 14 to squeeze the lifting spring 13 to produce a contraction deformation, and at the same time, the arc-surface lifting slider 14 is disengaged from the interior of the L-shaped guide slot 8 and retracted into the interior of the storage slot 12, so that the locking slider 7 moves downward along the length direction of the follower slot 6 under the action of gravity, and slides into the interior of the L-shaped guide slot 8, and then the flow meter external body 4 is rotated to drive the locking slider 7 to move along the interior of the L-shaped guide slot 8 and disengage from the interior of the perforation 3.

Claims

1. A thermal gas mass flow meter, comprising a gas flow duct (1), characterized in that: One end of the airflow duct (1) is fixedly connected to a connector (2), one end of the connector (2) is provided with a through hole (3) communicating with the airflow duct (1), a flow meter external body (4) is inserted into the through hole (3), one end of the flow meter external body (4) is fixedly connected to a built-in sensor (5), the built-in sensor (5) is installed inside the airflow duct (1), one end of the flow meter external body (4) is symmetrically provided with a follow-up slide groove (6), the inside of the follow-up slide groove (6) is slidably connected to a locking slider (7) ), the inner side of the connector (2) is symmetrically provided with an L-shaped guide groove (8) adapted to the locking slider (7), the interior of the L-shaped guide groove (8) is provided with a locking groove (9) adapted to the locking slider (7), one end of the flow meter external body (4) is provided with a locking nut (10) on a movable sleeve, the outer side of the connector (2) is provided with a locking thread (11) threadedly connected to the locking nut (10), and the interior of the L-shaped guide groove (8) is provided with a lifting component for pushing the locking slider (7) to embed into the locking groove (9).

2. A thermal gas mass flow meter according to claim 1, characterized in that: The lifting assembly comprises a receiving groove (12) provided inside the L-shaped guide groove (8), a lifting spring (13) being fixedly connected inside the receiving groove (12), a curved lifting slider (14) being fixedly connected to the top of the lifting spring (13), one end of the curved lifting slider (14) being slidably connected inside the receiving groove (12), and the receiving groove (12) being arranged directly below the locking groove (9).

3. A thermal gas mass flow meter according to claim 2, characterized in that: An unlocking slide groove (15) communicating with the receiving groove (12) is symmetrically provided at one end of the connector (2); an unlocking slide groove (16) is fixedly connected to one end of the arc-surface lifting slide block (14); and one end of the unlocking slide block (16) is slidably connected to the inside of the unlocking slide groove (15).

4. A thermal gas mass flow meter according to claim 1, characterized in that: A rubber sealing ring (17) is fixedly connected to the inner top of the locking nut (10), and the rubber sealing ring (17) fits the top of the connector (2).

5. A thermal gas mass flow meter according to claim 1, characterized in that: One end of the flow meter external body (4) is fixedly connected to a porous polymer elastic composite sleeve (18), and the porous polymer elastic composite sleeve (18) is embedded in the interior of the perforation (3).

6. A thermal gas mass flow meter according to claim 1, characterized in that: The outer side of the locking nut (10) is provided with a friction groove (19).

7. A thermal gas mass flow meter according to claim 3, characterized in that: An expansion slot (20) is provided on the inner side of the unlocking slide slot (15), and one end of the unlocking slider (16) extends into the interior of the expansion slot (20) and is fixedly connected to a driving block (21).

8. A thermal gas mass flow meter according to claim 1, characterized in that: The surface of the built-in sensor (5) is coated with a ceramic polymer nano coating.

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