Thermal mass flow meter

Abstract

The utility model relates to the technical field of flow meters, and discloses a thermal mass flow meter which comprises a meter head, and a detection pipe is fixedly installed below the meter head. The protection assembly comprises two protection covers, flanges, a top cover and a lower through hole, the side wall of each protection cover is fixedly provided with the same flange, the flanges on the two sides on the same side are locked through bolts, each protection cover is provided with a cavity, and the two protection covers jointly clamp and wrap a pipeline; the detection pipe penetrates through the protective cover above and extends into the pipeline for detection, the compression nut is in threaded connection with the detection pipe and compresses and fixes the top cover, the two protective covers are used for wrapping the connection position of the pipeline and the detection pipe, wrapping protection of the detection pipe is achieved, and the probability of overflow is reduced; the top cover is compressed at the opening of the upper protective cover by the compression nut, so that for maintenance, the top cover is more convenient to disassemble and assemble, the maintenance step is simplified, and the top cover has better practical application.

Description

Technical Field

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

[0002] Thermal gas mass flow meter is a new type of instrument used to measure and control gas mass flow. It is designed based on the principle of thermal diffusion (heat conduction) and uses the constant temperature difference method to accurately measure the gas.

[0003] The prior art discloses a thermal mass flowmeter (publication number: CN220871830U), including a meter head, a connecting pipe is fixed to the lower surface of the meter head, a sampling terminal is fixed to the end of the connecting pipe away from the meter head, a pipeline is arranged below the meter head, a first positioning frame is fixed to the upper surface of the pipeline, a second positioning frame is fixed to the upper surface of the first positioning frame, a maintenance mechanism is provided on the left side of the second positioning frame, and a stabilization mechanism is provided on the left side of the first positioning frame.

[0004] In the prior art, two connectable shells are provided on the basis of the existing flow meter, and the flow meter is disassembled and assembled by disassembling and assembling the two shells. After the flow meter and the pipeline are installed, the connection position is in an open space. If the connection position leaks, it will overflow directly, and there is a lack of sealing for the connection position. Secondly, the clamping of the two shells in the above-mentioned prior art cannot provide downward pressure in the installation direction of the flow meter. The shell can only prevent the pipeline of the flow meter from falling off, and cannot provide the flow meter with a force to squeeze toward the installation pipeline.

[0005] To this end, we propose a thermal mass flow meter. Utility Model Content

[0006] The utility model mainly solves the above-mentioned technical problem of poor sealing performance at the connection position between the flow meter and the pipeline, and provides a thermal mass flow meter.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solution, a thermal mass flow meter, comprising:

[0008] A meter head, a detection tube is fixedly installed below the meter head, a detection terminal is fixedly installed at the lower end of the detection tube, and a gas flow sensor is fixedly installed at the bottom end of the detection tube;

[0009] A protective component is arranged below the meter head and is used to protect the connection position between the detection tube and the pipeline. The protective component includes a protective cover, a rib, a top cover, a clamping nut and a lower through hole. There are two protective covers, and the side walls of each protective cover are fixedly installed with the same rib. The ribs on both sides of the same side are locked by bolts. The protective cover has a cavity, and the two protective covers clamp and wrap the pipeline together. The detection tube passes through the upper protective cover and extends into the pipeline for detection. The top cover is detachably arranged on the top of the protective cover, and the clamping nut is threadedly connected to the detection tube and clamps and fixes the top cover.

[0010] As a preferred embodiment of the utility model, the protective cover forms a rectangular block structure, and the same retaining edges are symmetrically arranged on the two opposite sides of the protective cover. The wall surface of each retaining edge is provided with a mounting hole, and the bolts pass through the mounting holes and the two retaining edges are locked by nuts.

[0011] As a preferred embodiment of the utility model, an arc-shaped groove is provided on one side of the protective cover for installing the pipe, and the arc-shaped grooves on the two protective cover walls together form a circular plate, and the pipe passes through the circular hole.

[0012] As a preferred embodiment of the present invention, the outer wall of the detection tube is provided with threads, and the clamping nut is threadedly connected to the outer wall of the detection tube.

[0013] As a preferred embodiment of the utility model, the top of the protective cover is provided with a lower through hole for installing the detection tube, the detection tube extends into the protective cover cavity through the lower through hole, the top of the protective cover is open, and the top cover is adapted to the opening of the protective cover.

[0014] As a preferred embodiment of the utility model, the protection component further comprises a sinking groove, the top of the protection cover is provided with the sinking groove, a sealing ring is arranged in the sinking groove, and the top cover contacts the sealing ring.

[0015] As a preferred embodiment of the present invention, the protection assembly further comprises an anti-slip rod, and the same anti-slip rods are fixedly mounted on the four corners of the top cover, and the anti-slip rods can contact the outer wall of the protective cover to limit the slippage of the top cover.

[0016] As a preferred embodiment of the utility model, the anti-drop rod forms a rod body structure with an L-shaped horizontal cross section, the anti-drop rod and the top cover are integrally formed, and the anti-drop rod is clamped at the four corners of the protective cover.

[0017] Beneficial Effects

[0018] The utility model provides a thermal mass flow meter, which has the following beneficial effects:

[0019] 1. This thermal mass flowmeter, by setting two protective covers, uses the two protective covers to wrap the connection position of the pipeline and the detection tube, realizes the wrapping protection of the detection tube and reduces the probability of overflow. By setting a detachable top cover, during installation, the two protective covers can be fixed to the pipeline first, and then the detection tube can be connected to the pipeline, and finally the clamping nut can be tightened, and the top cover can be pressed to the opening of the upper protective cover by using the clamping nut. For maintenance, it is easier to disassemble and assemble, simplifies the maintenance steps, and has better practical application.

[0020] 2. This thermal mass flowmeter squeezes the sealing ring into the sinking groove through the top cover to achieve sealing of the gap between the top cover and the protective cover. After the detection tube and the pipeline are installed, the protective cover and the top cover can form a relatively sealed chamber to wrap the detection tube. The installation position of the detection tube and the pipeline is in the sealed chamber, which has a better sealing effect.

[0021] 3. This thermal mass flowmeter is provided with an anti-drop rod, and utilizes the angle iron-shaped anti-drop rod to clamp the four corners of the protective cover. When the top cover is tightened and fixed by the clamping nut, the protective cover has a stronger anti-deviating effect, thereby ensuring the supporting performance of the top cover for the detection tube and better sealing performance for the protective cover chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is one of the overall three-dimensional diagrams of the utility model;

[0023] Figure 2 This is the second overall stereogram of the utility model;

[0024] Figure 3 This is a three-dimensional diagram of the protective component of the utility model;

[0025] Figure 4 This is a three-dimensional diagram of the protective cover of the utility model;

[0026] Figure 5 It is a three-dimensional diagram of the top cover of the utility model.

[0027] Legend: 10, meter head; 11, detection tube; 12, detection terminal; 20, protective cover; 21, rib; 22, top cover; 23, locking nut; 24, lower through hole; 30, sinking groove; 31, anti-drop rod. DETAILED DESCRIPTION

[0028] A thermal mass flow meter, such as Figure 1 and Figure 2 As shown, including:

[0029] A meter head 10 is provided below the meter head 10, a detection tube 11 is fixedly installed, a detection terminal 12 is fixedly installed at the lower end of the detection tube 11, a gas flow sensor is fixedly installed at the bottom end of the detection tube 11, and the gas flow sensor needs to be connected to the control board of the meter head 10 by electrical signals. The meter head 10 is connected to an external device, such as a computer, and the gas flow sensor is used to detect the flow of gas flowing through the pipeline, and then the quality of the gas is obtained in conjunction with the software. The specific detection method has been disclosed in detail in the prior art, and the detection method in (Publication No.: CN220871830U) can be referred to, and no further description is given here;

[0030] like Figure 2 and Figure 3 As shown, the protective assembly is arranged below the meter head 10 to protect the connection position between the detection tube 11 and the pipeline. The protective assembly includes a protective cover 20, a flange 21, a top cover 22, a clamping nut 23 and a lower through hole 24. The protective cover 20 has two, and the side wall of each protective cover 20 is fixedly installed with the same flange 21. The flanges 21 on both sides of the same side are locked by bolts. The protective cover 20 has a cavity. The two protective covers 20 clamp and wrap the pipeline together. The detection tube 11 passes through the upper protective cover 20 and extends to the pipeline for detection. The top cover 22 is detachably arranged on the top of the protective cover 20. The clamping nut 23 is threadedly connected to the detection tube 11 and clamps and fixes the top cover 22. The protective cover 20 forms a rectangular block. Structure, the same flanges 21 are symmetrically arranged on the two opposite sides of the protective cover 20, and the wall surface of each flange 21 is provided with a mounting hole, and the bolt passes through the mounting hole and the two flanges 21 are locked by a nut, and an arc groove is provided on one side of the protective cover 20 for installing the pipeline, and the arc grooves on the walls of the two protective covers 20 together form a circular plate, and the pipeline passes through the circular hole, and the outer wall of the detection tube 11 is provided with a thread, and the clamping nut 23 is threadedly connected with the outer wall of the detection tube 11, and the top of the protective cover 20 is provided with a lower through hole 24 for installing the detection tube 11, and the detection tube 11 extends into the cavity of the protective cover 20 through the lower through hole 24, and the top of the protective cover 20 is open, and the top cover 22 is adapted to the opening of the protective cover 20;

[0031] In the present solution, two protective covers 20 are provided and the connection position between the pipeline and the detection tube 11 is wrapped with the two protective covers 20 to realize the wrapping protection of the detection tube 11 and reduce the probability of overflow. By providing a removable top cover 22, during installation, the two protective covers 20 can be fixed to the pipeline first, and then the detection tube 11 can be connected to the pipeline, and finally the clamping nut 23 can be tightened. The clamping nut 23 can be used to press the top cover 22 to the opening of the upper protective cover 20. For maintenance, it is easier to disassemble and assemble, simplifies the maintenance steps, and has better practical application.

[0032] like Figure 4As shown, the protection component also includes a sinking groove 30. The top of the protective cover 20 opens the sinking groove 30. A sealing ring is arranged in the sinking groove 30. The top cover 22 abuts against the sealing ring. By setting the sealing ring, the sealing ring is squeezed into the sinking groove 30 through the top cover 22 to achieve sealing of the gap between the top cover 22 and the protective cover 20. After the detection tube 11 is installed with the pipeline, the protective cover 20 and the top cover 22 can form a relatively sealed chamber to wrap the detection tube 11. The installation position of the detection tube 11 and the pipeline is in the sealed chamber, which has a better sealing effect.

[0033] like Figure 5 As shown, the protection component also includes an anti-slip rod 31, and the four corners of the top cover 22 are fixedly installed with the same anti-slip rod 31, the anti-slip rod 31 can resist the outer wall of the protective cover 20 to limit the sliding of the top cover 22, and the anti-slip rod 31 forms a rod body structure with an L-shaped horizontal cross-section. The anti-slip rod 31 and the top cover 22 are integrally formed, and the anti-slip rod 31 is clamped at the four corners of the protective cover 20. By setting the anti-slip rod 31, the four corners of the protective cover 20 are clamped by the angle iron-shaped anti-slip rod 31. When the top cover 22 is tightened and fixed by the clamping nut 23, the protective cover 20 has a stronger anti-deviation effect, thereby ensuring the supporting performance of the top cover 22 for the detection tube 11 and the better sealing performance of the chamber of the protective cover 20.

[0034] The working principle of the utility model is as follows: two protective covers 20 are used to wrap the connection position of the pipeline and the detection tube 11 to realize the wrapping protection of the detection tube 11. The two protective covers 20 can be fixed to the pipeline first, and then the detection tube 11 can be connected to the pipeline. Specifically, the detection tube 11 can be locked with the flange of the pipeline through the flange, that is, the bolts and nuts are locked and fixed, and finally the clamping nut 23 is tightened. The top cover 22 is pressed against the opening of the upper protective cover 20 by the clamping nut 23, and the top cover 22 squeezes the sealing ring in the sinking groove 3. 0, to achieve sealing of the gap between the top cover 22 and the protective cover 20. After the detection tube 11 and the pipeline are installed, the protective cover 20 and the top cover 22 can form a relatively sealed chamber to wrap the detection tube 11. The installation positions of the detection tube 11 and the pipeline are in the sealed chamber. The four corners of the protective cover 20 are clamped by the angle iron anti-drop rod 31. When the top cover 22 is tightened and fixed by the clamping nut 23, the protective cover 20 has a stronger anti-deviating effect, thereby ensuring the sealing performance of the top cover 22 to the upper opening of the protective cover 20.

[0035] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A thermal mass flowmeter, characterized in that: include: A meter head (10), a detection tube (11) is fixedly installed below the meter head (10), a detection terminal (12) is fixedly installed at the lower end of the detection tube (11), and a gas flow sensor is fixedly installed at the bottom end of the detection tube (11); A protection component is arranged below a meter head (10) and is used to protect the connection position between a detection tube (11) and a pipeline. The protection component comprises a protection cover (20), a flange (21), a top cover (22), a clamping nut (23) and a lower through hole (24). The protection cover (20) has two, and the side wall of each protection cover (20) is fixedly mounted with the same flange (21). The flanges (21) on both sides of the same side are locked by bolts. The protection cover (20) has a cavity. The two protection covers (20) clamp and wrap the pipeline together. The detection tube (11) passes through the upper protection cover (20) and extends into the pipeline for detection. The top cover (22) is detachably arranged on the top of the protection cover (20). The clamping nut (23) is threadedly connected to the detection tube (11) and clamps and fixes the top cover (22).

2. The thermal mass flowmeter according to claim 1, characterized in that: The protective cover (20) forms a rectangular block structure, and the protective cover (20) has symmetrically arranged identical retaining edges (21) on opposite sides, and a mounting hole is provided on the wall surface of each retaining edge (21). Bolts pass through the mounting holes and are locked by nuts.

3. The thermal mass flowmeter according to claim 1, characterized in that: An arc-shaped groove is provided on one side of the protective cover (20) for installing a pipeline. The arc-shaped grooves on the walls of the two protective covers (20) together form a circular plate, and the pipeline passes through the circular hole.

4. The thermal mass flowmeter according to claim 1, characterized in that: The outer wall of the detection tube (11) is provided with threads, and the clamping nut (23) is threadedly connected to the outer wall of the detection tube (11).

5. The thermal mass flowmeter according to claim 1, characterized in that: The top of the protective cover (20) is provided with a lower through hole (24) for installing the detection tube (11), and the detection tube (11) extends through the lower through hole (24) into the cavity of the protective cover (20). The top of the protective cover (20) is open, and the top cover (22) is adapted to the opening of the protective cover (20).

6. The thermal mass flowmeter according to claim 1, characterized in that: The protection component also includes a sinking groove (30). The top of the protection cover (20) is provided with the sinking groove (30). A sealing ring is arranged in the sinking groove (30), and the top cover (22) contacts the sealing ring.

7. The thermal mass flowmeter according to claim 1, characterized in that: The protection assembly further comprises an anti-slip rod (31), and the same anti-slip rod (31) is fixedly mounted at the four corners of the top cover (22), and the anti-slip rod (31) can contact the outer wall of the protection cover (20) to limit the sliding of the top cover (22).

8. The thermal mass flowmeter according to claim 7, characterized in that: The anti-slip rod (31) forms a rod body structure with an L-shaped horizontal cross section. The anti-slip rod (31) and the top cover (22) are integrally formed. The anti-slip rod (31) is clamped at four corners of the protective cover (20).

Images