Steady-flow thermal gas mass flow meter
By introducing a flow stabilizing tube and a slow-flow disk structure into the thermal gas mass flowmeter, the measurement deviation problem caused by uneven mixed gas flow velocity and temperature specific heat capacity differences is solved, achieving higher measurement accuracy and sensor protection.
Patent Information
- Application Number
- CN202423021203.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-12-09
AI Technical Summary
When measuring mixed gases of different media, existing thermal gas mass flowmeters have measurement result deviation problems caused by uneven flow rate and temperature specific heat capacity differences.
A steady-flow thermal gas mass flowmeter is designed, which includes a steady-flow tube and a slow-flow disk. Through the structural design of the steady-flow tube and the slow-flow disk, the gas is evenly transported to the temperature sensor, reducing the damage to the sensor caused by excessive flow velocity. The slow-flow holes also make the gas evenly distributed, reducing measurement deviation.
It effectively prevents the temperature sensor from being damaged by excessive gas flow rate, reduces the deviation of the measurement results by evenly delivering gas, and improves the measurement accuracy.
Smart Images
Figure CN223389236U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thermal gas mass flowmeters, in particular to a steady-flow thermal gas mass flowmeter. Background Art
[0002] Thermal gas mass flowmeters are flowmeters designed based on the principle of thermal diffusion. This principle utilizes the fact that when a fluid flows through a heat source, the amount of heat dissipated by the heat source is proportional to the fluid's flow rate. This series of flowmeters uses two standard-grade RTD sensors: one for heat source and one for measuring fluid temperature. As the fluid flows, the temperature difference between the two is linearly related to the flow rate. Microelectronic control technology converts this relationship into a linear output signal for measuring flow. When the gas to be measured enters the gas pipeline, it may contain gases of different media. Mixed gases of different media have different specific heat capacities to temperature, and the flow rate may be uneven as it passes through the sensor, resulting in deviations in the measured results. Utility Model Content
[0003] The purpose of this application is to provide a steady-flow thermal gas mass flowmeter, aiming to solve the above-mentioned problems in the prior art.
[0004] The present application provides a steady-flow thermal gas mass flowmeter, comprising a thermal gas mass flowmeter body, the thermal gas mass flowmeter body being fixedly connected to a gas pipeline, and a flange being fixedly connected to each end of the gas pipeline; a limiting ring being fixedly connected to the gas pipeline upstream of the thermal gas mass flowmeter body, a flow stabilizing tube being magnetically connected to the limiting ring, and the flow stabilizing tube being a pipe having three sections with different inner diameters, wherein the middle section is a tapered pipe with a diameter gradually decreasing from upstream to downstream, and the first section has a diameter equal to the diameter of the cone. The cylindrical pipe has the same maximum diameter as the conical pipe, and its tail section is a cylindrical pipe with the same diameter as the minimum diameter of the conical pipe. The head end of the conical pipe in the middle section of the flow stabilizing pipe is fixedly connected to a mounting ring, and a reset spring is fixedly connected to the mounting ring. The other end of the reset spring is fixedly connected to the slow flow disk, and the slow flow disk is slidably connected to the cylindrical pipe of the first section of the flow stabilizing pipe, and a slow flow hole is provided in the slow flow disk. The cylindrical pipe of the tail section of the flow stabilizing pipe is detachably connected to the flow stabilizing disk, and a plurality of flow stabilizing holes are provided in the flow stabilizing disk.
[0005] Furthermore, the gas pipeline is fixedly connected to the main pipeline through a flange.
[0006] Furthermore, a pressure sensor is fixedly connected to the main pipeline upstream of the gas pipeline.
[0007] Furthermore, the limiting ring is a tapered ring with a diameter gradually decreasing from upstream to downstream, and its taper is the same as the taper of the tapered pipe in the middle section of the flow stabilizing pipe.
[0008] Furthermore, a magnetic block is embedded in the limiting ring, and a magnetic body that is magnetically matched with the magnetic block is embedded in the flow stabilizing tube.
[0009] Furthermore, a thread is provided on the outside of the tail end of the cylindrical pipe of the tail section of the flow stabilizing pipe, and the flow stabilizing disk is threadedly connected to the flow stabilizing pipe.
[0010] Furthermore, the slow-flow hole is a tapered hole with a diameter gradually decreasing from upstream to downstream.
[0011] The beneficial effects of the utility model are as follows: the utility model prevents the temperature sensor from being damaged due to excessive gas flow rate through the slow flow disk; and uniformly transports the gas to be tested toward the temperature sensor through the steady flow disk, thereby reducing the deviation of the test result. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0013] Figure 2 This is an enlarged schematic diagram of part A.
[0014] Figure 3 This is a side view of the slow flow plate.
[0015] Figure 4 This is a side view of the flow stabilizer.
[0016] In the picture:
[0017] 1- Thermal gas mass flowmeter body; 2- Gas pipeline; 3- Flange; 4- Limiting ring; 5- Flow stabilizing tube; 6- Mounting ring; 7- Reset spring; 8- Slow flow disc; 9- Slow flow hole; 10- Flow stabilizing disc; 11- Flow stabilizing hole; 12- Main pipeline; 13- Pressure sensor; 14- Magnetic block; 15- Magnetic body; 16- Temperature sensor. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0019] like Figure 1-4A steady-flow thermal gas mass flowmeter shown includes a thermal gas mass flowmeter body 1, which includes a temperature sensor 16. The thermal gas mass flowmeter body 1 is fixedly connected to a gas pipeline 2, and a flange 3 is fixedly connected to each end of the gas pipeline 2; a limit ring 4 is fixedly connected to the upstream of the thermal gas mass flowmeter body 1 in the gas pipeline 2, and a flow stabilizing tube 5 is magnetically connected to the limit ring 4. The flow stabilizing tube 5 is composed of three sections of pipes with different inner diameters, the middle section of which is a tapered pipe with a diameter gradually decreasing from upstream to downstream, the first section of which is a cylindrical pipe with the same diameter as the maximum diameter of the tapered pipe, and the tail section of which is a cylindrical pipe with a diameter the same as the maximum diameter of the tapered pipe. The cylindrical pipe has the same diameter as the minimum diameter of the tapered pipe. The head end of the tapered pipe in the middle section of the stabilizer pipe 5 is fixedly connected to a mounting ring 6. A reset spring 7 is fixedly connected to the mounting ring 6. The other end of the reset spring 7 is fixedly connected to a slow-flow disc 8. The slow-flow disc 8 is slidably connected to the cylindrical pipe at the head section of the stabilizer pipe 5. A slow-flow hole 9 is provided in the slow-flow disc 8. When the pressure of the gas to be measured is too high, the slow-flow disc 8 moves downstream, and the elastic force of the reset spring 7 can offset part of the gas pressure. A stabilizing disc 10 is detachably connected to the cylindrical pipe at the tail section of the stabilizer pipe 5. A plurality of stabilizing holes 11 are provided in the stabilizing disc 10. The gas to be measured can be evenly transported toward the temperature sensor 16 through the stabilizing holes 11, which can reduce the deviation of the test results.
[0020] The gas pipeline 2 is fixedly connected to the main pipeline 12 through a flange 3.
[0021] A pressure sensor 13 is fixedly connected to the main pipeline 12 upstream of the gas pipeline 2. When the value measured by the pressure sensor 13 is too small, the delivery speed of the gas to be tested should be increased to ensure that enough gas to be tested can pass through the temperature sensor 16 evenly. When the value measured by the pressure sensor 13 is higher than the set value, it means that the air pressure inside the gas pipeline 2 is too high. In order to prevent damage to the pipeline and various components, the delivery of the gas to be tested should be stopped immediately.
[0022] The limiting ring 4 is a tapered ring with a gradually decreasing diameter from upstream to downstream, and its taper is the same as the taper of the tapered pipe in the middle section of the flow stabilizing pipe 5. The above structure enables the flow stabilizing pipe 5 to be connected with the limiting ring 4 in a fitting manner.
[0023] The limiting ring 4 is embedded with a magnetic block 14, and the flow stabilizing tube 5 is embedded with a magnetic body 15 that magnetically cooperates with the magnetic block 14. The magnetic cooperation between the magnetic block 14 and the magnetic body 15 allows the flow stabilizing tube 5 to be firmly connected to the gas pipeline 2.
[0024] The outer portion of the tail end of the cylindrical pipe of the tail section of the flow stabilizing tube 5 is provided with a thread, and the flow stabilizing disk 10 is threadedly connected to the flow stabilizing tube 5 .
[0025] The slow flow hole 9 is a tapered hole with a diameter gradually decreasing from upstream to downstream. The gas to be measured can collide with each other in the slow flow hole 9, so that the mixed gas of different media becomes more uniform after passing through the slow flow plate 8.
[0026] During installation, install the pressure sensor 13 on the main pipeline 12, place the flow stabilizer 5 into the gas pipeline 2 from the upstream port of the gas pipeline 2 until it is magnetically connected to the limit ring 4, thread the flow stabilizer disk 10 to the flow stabilizer 5 from the downstream port of the gas pipeline 2, then install the gas pipeline 2 on the main pipeline 12, and finally install the thermal gas mass flowmeter body 1 on the gas pipeline 2.
[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.
Claims
1. A steady-flow thermal gas mass flowmeter, characterized in that: The cam is connected to the gas pipe at the top and the bottom, and the cam is connected to the gas pipe at the bottom. The cam is connected to the gas pipe at the top and the bottom. The cam is connected to the gas pipe at the bottom.
2. A steady-flow thermal gas mass flowmeter according to claim 1, characterized in that: The gas pipeline is fixedly connected to the main pipeline through a flange.
3. A steady-flow thermal gas mass flowmeter according to claim 2, characterized in that: A pressure sensor is fixedly connected to the main pipeline upstream of the gas pipeline.
4. A steady-flow thermal gas mass flowmeter according to claim 1, characterized in that: The limiting ring is a tapered ring with a diameter gradually decreasing from upstream to downstream, and its taper is the same as the taper of the tapered pipe in the middle section of the flow stabilizing pipe.
5. The steady-flow thermal gas mass flowmeter according to claim 1, characterized in that: A magnetic block is embedded in the limiting ring, and a magnetic body that is magnetically matched with the magnetic block is embedded in the flow stabilizing tube.
6. A steady-flow thermal gas mass flowmeter according to claim 1, characterized in that: The outside of the tail end of the cylindrical pipe of the tail section of the flow stabilizing pipe is provided with a thread, and the flow stabilizing disc is threadedly connected to the flow stabilizing pipe.
7. The steady-flow thermal gas mass flowmeter according to claim 1, characterized in that: The slow-flow hole is a tapered hole with a diameter gradually decreasing from upstream to downstream.