Thermal type gas flowmeter

Abstract

The utility model discloses a thermal type gas flow meter, which belongs to the technical field of flow meters and comprises a flow meter body and a test circuit board, a thermal type sensor wafer is electrically connected onto the test circuit board, a first circuit board is mounted on the flow meter body through a second support frame, and the first circuit board is electrically connected with the test circuit board. The second circuit board is electrically connected with the first circuit board, a contact pin is arranged on the second circuit board, the contact pin is connected with a power source through a four-core wire, the shell covers the second supporting frame and is installed on the flow meter body, a penetrating through hole is formed in the flow meter body, and the two ends of the flow meter body are each provided with a quick plug connector. And a filter screen is mounted between the quick connector and the flow meter body through a snap spring for a hole and a sealing ring 1. The filter screen and the quick connector are arranged at the two ends of the flow meter body, so that it is guaranteed that gas entering the flow meter is clean and free of impurities, the measurement accuracy is guaranteed, quick installation and maintenance are facilitated, and the device is suitable for occasions needing to be frequently disassembled or moved.

Description

Technical Field

[0001] This utility model belongs to the field of flow meter technology, specifically relating to a thermal gas flow meter. Background Technology

[0002] A thermal gas flow meter is a precision instrument that measures the mass flow rate of a gas using the principle of heat conduction. It typically consists of two reference-level resistance thermometers: a heater and a temperature sensor that measures changes in gas temperature. When the heater sensor is energized and heated to a set temperature and maintains a stable thermal equilibrium, the gas flowing through the heater carries away some heat, causing the sensor temperature to drop. The temperature sensor, located downstream of the heater sensor, measures the gas temperature change. The gas mass flow rate is determined by measuring the temperature difference between the heater and the temperature sensor; the temperature difference is proportional to the gas mass flow rate.

[0003] The working principle of a thermal gas flow meter is based on the principles of thermal diffusion or thermal conduction. It calculates the mass flow rate of the gas by measuring the temperature change caused by the gas flowing through a heating element such as a hot wire. This type of flow meter can directly display the standard volumetric flow rate without temperature or pressure compensation. It can provide high-precision flow measurement results under various operating conditions and is widely used in industries such as petroleum, chemical, steel, metallurgy, power, light industry, pharmaceuticals, and environmental protection for the detection of gas flow rates such as air, oxygen, nitrogen, hydrocarbon gases, natural gas, and coal gas.

[0004] However, in the use of existing flow meters, when gas enters the flow meter, it carries impurities such as liquid or foreign matter, which can affect the temperature change of the heater and thus affect the accuracy of the measurement. Utility Model Content

[0005] In view of the above-mentioned problems in the prior art, the purpose of this utility model is to provide a thermal gas flow meter.

[0006] This utility model provides the following technical solution:

[0007] A thermal gas flow meter includes a flow meter body, a test circuit board mounted inside the flow meter body, a thermal sensor wafer electrically connected to the test circuit board, a first circuit board mounted on the flow meter body via a second support bracket, and the first circuit board is electrically connected to the test circuit board, the second circuit board is electrically connected to the first circuit board, and the second circuit board is provided with pins, which are connected to a power supply via a four-core wire, a housing covering the second support bracket, and the housing is mounted on the flow meter body, the flow meter body has a through hole inside, both ends of which are equipped with quick-connect connectors, and a filter screen is installed between the quick-connect connectors and the flow meter body through the hole using a retaining ring and a sealing ring.

[0008] Specifically, a support frame is installed at the bottom of the flow meter body.

[0009] Specifically, the test circuit board is installed inside the flow meter body using a pressure plate and screws, and the outer casing is snapped onto the flow meter body.

[0010] Specifically, the display circuit board is electrically connected to the second circuit board, and the display circuit board is electrically connected to the up and down buttons, the menu button and the display panel. At the same time, the up and down buttons, the menu button and the display panel are installed on the outer casing, and the display circuit board is located inside the outer casing.

[0011] Specifically, a sealing ring 2 is provided between the test circuit board and the flow meter body.

[0012] The beneficial effects of the utility model are:

[0013] 1. This device is equipped with filters and quick-connect fittings at both ends of the flow meter body to ensure that the gas entering the flow meter is clean and free of impurities, thereby ensuring the accuracy of the measurement and facilitating quick installation and maintenance, making it suitable for occasions that require frequent disassembly or relocation.

[0014] 2. This device is designed with sealing ring one and sealing ring two to ensure the sealing of all connections of the flow meter and prevent gas leakage;

[0015] 3. This device is equipped with a display panel, up and down keys, and a menu key, which can display the flow meter readings and facilitate user input to adjust the flow meter settings or view different measurement data, ensuring user convenience. Attached Figure Description

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 This is an exploded view of this utility model;

[0018] The components in the diagram are labeled as follows: 1. Support frame one; 2. Hole retaining ring; 3. Quick connector; 4. Filter screen; 5. Sealing ring one; 6. Flow meter body; 7. Test circuit board; 8. Sealing ring two; 9. Pressure plate; 10. Screw; 11. Circuit board one; 12. Support frame two; 13. Circuit board two; 14. Pin; 15. Display circuit board; 16. Menu key; 17. Up and down keys; 18. Housing; 19. Four-core wire; 20. Display panel. Detailed Implementation

[0019] like Figure 1As shown, this utility model provides a thermal gas flow meter, including a flow meter body 6, a test circuit board 7 installed inside the flow meter body 6, a thermal sensor wafer integrating a heating element and a temperature sensor electrically connected to the test circuit board 7, a first circuit board 11 installed on the flow meter body 6 via a second support frame 12, and the first circuit board 11 is electrically connected to the test circuit board 7, a second circuit board 13 is electrically connected to the first circuit board 11, and the second circuit board 13 is provided with a pin 14, the pin 14 is connected to a power supply via a four-core wire 19, and a housing 18 covers the second support frame 12 and is installed on the flow meter body 6; the flow meter body 6 has a through hole inside, and quick-connect connectors 3 are installed at both ends of the through hole, and a filter screen 4 is installed between the quick-connect connector 3 and the flow meter body 6 through the hole using a retaining spring 2 and a sealing ring 5.

[0020] When gas flows through the heating element, it carries away some heat, causing the element's temperature to drop. The flow meter uses a temperature sensor to measure this temperature change to estimate the gas flow rate. The higher the flow rate, the more heat is carried away, and the more significant the temperature drop. Furthermore, in this device, the gas is first filtered through filter 4 to ensure measurement accuracy.

[0021] Because this thermal gas flow meter is designed to measure a smaller flow range, compared to thermal gas flow meters that measure a larger flow range, this thermal gas flow meter uses a quick-connect fitting 3 connection method. This connection method facilitates quick installation and maintenance and is suitable for occasions that require frequent disassembly or relocation. Its quick installation and disconnection feature greatly simplifies assembly and maintenance operations and reduces downtime.

[0022] Test circuit board 7 is used to test the electronic components of the flow meter to ensure that they are working properly; circuit board 2 13 is used to connect to the power supply and provide power to various electronic components; circuit board 1 11 is used to process the flow meter's signals and control logic.

[0023] Specifically, a support frame 1 is installed at the bottom of the flow meter body 6, which facilitates the subsequent fixing of the flow meter body 6 to other devices or locations.

[0024] Specifically, the test circuit board 7 is installed inside the flow meter body 6 by means of the pressure plate 9 and screws 10, and the outer casing 18 is snapped onto the flow meter body 6.

[0025] Furthermore, to facilitate real-time monitoring and control of the flow meter by staff, the display circuit board 15 is electrically connected to the second circuit board 13, and the display circuit board 15 is electrically connected to the up / down keys 17, the menu key 16, and the display panel 20. At the same time, the up / down keys 17, the menu key 16, and the display panel 20 are installed on the housing 18, and the display circuit board 15 is located inside the housing 18, so that the flow meter reading can be displayed, and it is convenient for users to input and adjust the flow meter settings or view different measurement data.

[0026] Furthermore, to prevent the test circuit board 7 from being wetted by liquid carried by the gas or liquid from the external environment, and to prevent gas leakage, a sealing ring 8 is provided between the test circuit board 7 and the flow meter body 6.

[0027] The working principle of this utility model is as follows:

[0028] The gas first enters the flow meter through a quick-connect fitting 3 made of 304 stainless steel, and then passes through a filter 4, also made of 304 stainless steel, to ensure that the gas entering the flow meter is clean and free of impurities. Next, the gas flows through the flow meter body 6, which is made of BPT material and integrates a thermal sensor wafer for measuring gas flow. During gas flow, sealing rings 5 ​​and 8 ensure the sealing of all connections of the flow meter, preventing gas leakage.

[0029] The flow meter body 6 transmits the flow signal to the test circuit board 7, circuit board one 11, and circuit board two 13. These circuit boards, composed of electronic components, process the flow signal and execute control logic. Pins 14 and four-core wires 19 are responsible for transmitting signals and power between the circuit boards. The processed flow data is sent to the display circuit board 15 and displayed to the user via the display panel 20.

[0030] Users can interact with the flow meter using the menu key 16 and the up and down keys 17 to adjust settings or view measurement data. All internal components of the flow meter are protected by housings 18 made of PBT material, providing additional protection, including waterproofing and dustproofing. Support brackets 1 and 2 12, along with screws 10, ensure the stability of the flow meter structure and the secure fixing of each component. Snap rings 2 are used to secure the filter screen 4 during assembly. This design ensures the accuracy, stability, and user-friendliness of this thermal gas flow meter.

[0031] This device features filters 4 and quick-connect fittings 3 at both ends of the flowmeter body 6 to ensure that the gas entering the flowmeter is clean and free of impurities, thereby ensuring measurement accuracy and facilitating quick installation and maintenance. This makes it suitable for applications requiring frequent disassembly or relocation. It also incorporates sealing rings 5 ​​and 8 to ensure the sealing of all connections and prevent gas leakage. Furthermore, the device includes a display panel 20, up / down keys 17, and a menu key 16, allowing users to display flowmeter readings and input / adjust flowmeter settings or view different measurement data, ensuring ease of operation.

[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A thermal gas flow meter, comprising a flow meter body, a test circuit board mounted inside the flow meter body, a thermal sensor wafer electrically connected to the test circuit board, a first circuit board mounted on the flow meter body via a second support bracket, and the first circuit board being electrically connected to the test circuit board, a second circuit board being electrically connected to the first circuit board, and the second circuit board having pins connected to a power supply via a four-core wire, and a housing covering the second support bracket, and the housing being mounted on the flow meter body. It is characterized in that The flow meter body has a through hole inside, with quick-connect fittings installed at both ends. A filter screen is installed between the quick-connect fittings and the flow meter body through the hole using a snap ring and a sealing ring.

2. The thermal gas flow meter according to claim 1, characterized in that, A support frame is installed at the bottom of the flow meter body.

3. A thermal gas flow meter according to claim 1, characterized in that, The test circuit board is installed inside the flow meter body using a pressure plate and screws, and the outer casing is snapped onto the flow meter body.

4. A thermal gas flow meter according to claim 1, characterized in that, The display circuit board is electrically connected to the second circuit board, and the display circuit board is electrically connected to the up and down buttons, the menu button and the display panel. At the same time, the up and down buttons, the menu button and the display panel are mounted on the housing, and the display circuit board is located inside the housing.

5. A thermal gas flow meter according to any one of claims 1-4, characterized in that, A sealing ring is provided between the test circuit board and the flow meter body.

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