Gas flow measurement device

Abstract

The present invention relates to the technical field, and in particular to a gas flow measurement device, comprising: a control device, the control device comprising a housing and a main circuit board, the main circuit board being installed in a cavity, the main circuit board comprising a control module, a differential pressure detection module and a thermal detection module, the differential pressure detection module and the thermal detection module being both electrically connected to the control module; a flow detection component, the flow detection component comprising a differential pressure flow detector and a thermal flow detector, the differential pressure detection module and the differential pressure flow detector being electrically connected, and the thermal detection module and the thermal flow detector being electrically connected. The gas flow measurement device provided by the present invention integrates the differential pressure flow detector and the thermal flow detector in the gas flow measurement device, uses different flow detectors in different environments, does not need to replace the gas flow measurement device, improves the work efficiency of workers, and avoids leakage of gas such as gas in the pipeline caused by multiple replacements of the gas flow measurement device.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring equipment, and in particular to a gas flow measuring device. Background Art

[0002] At present, the commonly used measurement principles for gas flow measurement are: differential pressure, thermal, ultrasonic, vortex, etc. The ultrasonic flowmeter adopts the time difference method, using a pair of ultrasonic transducers to send and receive ultrasonic waves alternately in opposite directions, and measures the flow velocity of the fluid by observing the downstream and upstream propagation time in the medium, and then calculates the flow rate by the flow velocity. It is an indirect, non-contact measuring instrument; the vortex flowmeter is a flowmeter that measures the flow rate of closed pipe fluid based on the Karman vortex principle; the differential pressure flowmeter calculates the flow rate by measuring the pressure drop on the obstacle inserted in the flow channel; the thermal mass flowmeter measures the mass flow based on the heat transfer principle of the heating element.

[0003] However, the sensitivity and range of the differential pressure flowmeter cannot meet the measurement requirements in an environment with low flow and little water vapor; and the sensitivity and range of the thermal flowmeter cannot meet the measurement requirements in a humid working environment with high water vapor and high flow rate. Factors such as humidity will be affected by climate and season. Therefore, in actual use, different flow meters need to be replaced according to different environments, and the flow meter needs to be disassembled and installed many times, which is time-consuming, labor-intensive, and cost-intensive. In some specific occasions, such as underground mines, the disassembly and installation of the flow meter is relatively complicated. Multiple installation and disassembly of the flow meter will reduce the work efficiency of the staff and easily cause gas leakage such as methane in the mine pipeline. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the technical problem that the flow meter in the prior art needs to be replaced multiple times according to the environment during use, which reduces the work efficiency of the staff and is also easy to cause leakage of gas such as methane in the mine pipeline, the present invention provides a gas flow measurement device, which integrates a differential pressure flow detector and a thermal flow detector in the gas flow measurement device. Through the control of a control module, different flow detectors are used in different environments, so that there is no need to replace the gas flow measurement device, thereby improving the work efficiency of the workers and avoiding leakage of gas such as methane in the pipeline caused by multiple replacements of the gas flow measurement device.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a gas flow measurement device, comprising:

[0006] A control device, the control device comprising a housing and a main circuit board, the housing having a cavity therein, the main circuit board being installed in the cavity, the main circuit board comprising a control module, a differential pressure detection module and a thermal detection module, the differential pressure detection module and the thermal detection module being both electrically connected to the control module;

[0007] A flow detection component, the flow detection component includes a differential pressure flow detector and a thermal flow detector, the differential pressure detection module is electrically connected to the differential pressure flow detector, and the thermal detection module is electrically connected to the thermal flow detector.

[0008] Furthermore, a display is installed in the housing, and the differential pressure detection module and the thermal detection module are both electrically connected to the display.

[0009] Furthermore, the control device further comprises a cover body, which is mounted on the shell to cover the shell, and a display window is provided on the cover body.

[0010] Furthermore, it also includes a connector, one end of which is fixedly connected to the control device, and the other end of which is fixedly connected to the flow detection component.

[0011] Furthermore, the connector includes a catheter seat cover, a column is fixedly provided at the lower end of the shell, a plug-in slot is provided at the upper end of the catheter seat cover, the column is plugged into the catheter seat cover, a step surface is provided at the lower end of the column, and the step surface is abutted against the bottom surface of the plug-in slot for limiting position.

[0012] Furthermore, a shaft retaining ring is provided on the cylinder, an annular groove is provided on the circumferential surface of the cylinder, the shaft retaining ring is installed in the annular groove, a limit plate is sleeved on the cylinder, the limit plate is located above the shaft retaining ring, the limit plate and the shaft retaining ring are abutted, the shaft retaining ring and the limit plate and the cylinder are inserted into the catheter seat cover together, a press plate is provided above the limit plate, the press plate and the limit plate are abutted, and the press plate and the catheter seat cover are detachably fixedly connected.

[0013] The beneficial effect of the present invention is that, when the gas flow measurement device of the present invention is in an environment with low flow rate and small water vapor, the control module controls the thermal detection module to be enabled, and the data displayed on the display at this time is the data transmitted by the thermal detection module, and when the gas flow measurement device is in an environment with high flow rate and large water vapor, the control module controls the differential pressure detection module to be enabled, and the data displayed on the display at this time is the data transmitted by the differential pressure detection module. Thus, the detection accuracy of the gas flow measurement device is improved.

[0014] When the shell and the catheter seat cover are connected, the lower end of the column is limited by the step surface and the bottom surface of the plug-in slot, so that the column cannot move upward, and the shaft retaining ring and the column cannot move upward through the interference between the limiting plate and the shaft retaining ring, thereby fixing the column and the catheter seat cover relatively. When the column needs to be separated from the catheter seat cover, it is only necessary to remove the pressing plate from the catheter seat cover and then move the column out of the plug-in slot, thereby facilitating the maintenance of the control device without removing the entire gas flow measurement device from the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a structural schematic diagram of the gas flow measurement device of the present invention.

[0017] Figure 2 It is a cross-sectional schematic diagram of the gas flow measurement device of the present invention.

[0018] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0019] Figure 4 yes Figure 2 Enlarged view of point B in the middle.

[0020] Figure 5 It is a structural schematic diagram of the differential pressure detection tube and the connecting tube of the present invention.

[0021] Figure 6 It is a bottom view schematic diagram of the differential pressure detection tube and the connecting tube of the present invention.

[0022] In the figure: 1, control device; 1-1, housing; 1-2, main circuit board; 2, flow detection assembly; 2-1, differential pressure flow detector; 2-2, thermal flow detector; 1-3, display; 1-4, cover; 3, connector; 3-1, catheter seat cover; 1-11, column; 3-11, plug slot; 1-111, step surface; 1-12, shaft retaining ring; 1-13, limit plate; 3-2, press plate; 3-3, connecting pipe; 3-31, first gas channel; 3-32, second gas channel; 3-33, first ventilation joint; 3-34, second ventilation joint; 3-35, first gas nozzle; 3-36, second gas nozzle; 2-11, differential pressure detection tube; 2-111, high-pressure gas channel; 2-112, low-pressure gas channel; 2-113, first air inlet; 2-114, second inlet; 2-115, first contact surface; 2-116, second contact surface; 2-21, temperature sensor; 2-22, mass flow rate sensor. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] like Figures 1 to 6 As shown, it is the best embodiment of the present invention, a gas flow measurement device, including a control device 1, a connector 3 and a flow detection component 2, the flow detection component 2 is connected to the control device 1 for gas flow detection, the connector 3 is used to assemble the control device 1 and the flow detection component 2, the flow detection component 2 includes a differential pressure flow detector 2-1 and a thermal flow detector 2-2, the differential pressure flow detector 2-1 and the thermal flow detector 2-2 are both electrically connected to the control device 1, the differential pressure flow detector collects the pressure difference of the gas flowing through, and transmits the collected pressure difference data to the control device 1, the thermal flow detector 2-2 collects the temperature difference of the gas flowing through, calculates the heat carried away by the gas flowing through by the temperature difference, and thus calculates the flow rate of the gas flowing through.

[0026] The control device 1 includes a shell 1-1, a cover body 1-4, a main circuit board 1-2 and a first sealing ring. A cavity is provided inside the shell 1-1, and the main circuit board 1-2 is installed in the cavity. The cover body 1-4 is installed on the shell 1-1 to cover the shell 1-1. The first sealing ring is provided between the shell 1-1 and the cover body 1-4 to seal the shell 1-1 and the cover body 1-4. A display window is provided on the cover body 1-4. A display 1-3 is installed in the shell 1-1. The display 1-3 is matched with a display plug. The display 1-3 is electrically connected to the main circuit board 1-2 so as to display the information on the main circuit board 1-2 on the display 1-3.

[0027] The main circuit board 1-2 includes a control module, a differential pressure detection module and a thermal detection module. The differential pressure detection module and the thermal detection module are both electrically connected to the control module, the differential pressure detection module is electrically connected to the differential pressure flow detector 2-1, the thermal detection module is electrically connected to the thermal flow detector 2-2, and the differential pressure detection module and the thermal detection module are both electrically connected to the display 1-3. When the gas flow measurement device is in an environment with low flow rate and small water vapor, the control module controls the thermal detection module to be enabled. At this time, the data displayed on the display 1-3 is the data transmitted by the thermal detection module. When the gas flow measurement device is in an environment with high flow rate and large water vapor, the control module controls the differential pressure detection module to be enabled. At this time, the data displayed on the display 1-3 is the data transmitted by the differential pressure detection module. Thereby improving the detection accuracy of the gas flow measurement device.

[0028] The connector 3 includes a catheter seat cover 3-1, a press-fit plate 3-2 and a connecting pipe 3-3. A column 1-11 is fixedly arranged at the lower end of the shell 1-1. The column 1-11 and the shell 1-1 can be formed as one piece. A plug-in groove 3-11 is arranged at the upper end of the catheter seat cover 3-1. The column 1-11 is plugged into the catheter seat cover 3-1. A step surface 1-111 is arranged at the lower end of the column 1-11. The step surface 1-111 is abutted against the bottom surface of the plug-in groove 3-11 for limiting position. A second sealing ring is arranged between the column 1-11 and the catheter seat cover 3-1 for sealing. A shaft retaining ring 1-11 is arranged on the column 1-11. 12, an annular groove is provided on the circumferential surface of the cylinder 1-11, and the shaft retaining ring 1-12 is installed in the annular groove. A limit plate 1-13 is mounted on the cylinder 1-11, and the limit plate 1-13 is located above the shaft retaining ring 1-12, and the limit plate 1-13 is against the shaft retaining ring 1-12. The shaft retaining ring 1-12, the limit plate 1-13 and the cylinder 1-11 are inserted into the catheter seat cover 3-1 together, and the press-fit plate 3-2 is covered above the limit plate 1-13, and the press-fit plate 3-2 is against the limit plate 1-13. The press-fit plate 3-2 and the catheter seat cover 3-1 are detachably fixedly connected by screws. The lower end of the column 1-11 is limited by the step surface 1-111 and the bottom surface of the plug-in slot 3-11, so that the column 1-11 cannot move upward, and the interference between the limiting plate 1-13 and the shaft retaining ring 1-12 makes the shaft retaining ring 1-12 and the column 1-11 unable to move upward, thereby fixing the column 1-11 and the catheter seat cover 3-1 relatively. When it is necessary to separate the column 1-11 from the catheter seat cover 3-1, it is only necessary to remove the pressing plate 3-2 from the catheter seat cover 3-1, and then remove the column 1-11 from the plug-in slot 3-11, thereby facilitating the maintenance of the control device 1 without removing the entire gas flow measurement device from the equipment.

[0029] The upper end of the connecting pipe 3-3 is provided with an external thread, and the lower end of the catheter seat cover 3-1 is provided with an internal thread hole. The connecting pipe 3-3 and the catheter seat cover 3-1 are fixed by the matching thread connection of the external thread and the internal thread hole. The connecting pipe 3-3 is provided with a first gas channel 3-31 and a second gas channel 3-32. The upper end surface of the connecting pipe 3-3 is connected with a first ventilation joint 3-33 and a second ventilation joint 3-34. The first ventilation joint 3-33 is connected to the first gas channel 3-31, and the second gas channel 3-32 is connected to the second ventilation joint 3-34. The first ventilation joint 3-33 and the second ventilation joint 3-34 are both connected to a differential pressure sensor. The upper end surface of the connecting pipe 3-3 is connected with a plurality of first gas nozzles 3-35 and a plurality of second gas nozzles 3-36. The first gas nozzle 3-35 is connected to the first gas channel 3-31, and the second gas nozzle 3-36 is connected to the second gas channel 3-32.

[0030] The differential pressure flow detector 2-1 includes a differential pressure detection tube 2-11, which is fixedly connected to the connecting tube 3-3. The cross section of the differential pressure detection tube 2-11 is in the shape of a bullet head. The smaller end of the differential pressure detection tube 2-11 first contacts the gas flowing in the pipeline. The differential pressure detection tube 2-11 includes a first contact surface 2-115 and a second contact surface 2-116. The first contact surface 2-115 is located at the smaller end of the differential pressure detection tube 2-11, and the second contact surface 2-116 is located at the larger end of the differential pressure detection tube 2-11. At one end, the first contact surface 2-115 is the windward side of the airflow direction, and the second contact surface 2-116 is the leeward side of the airflow direction. The first contact surface 2-115 is provided with a plurality of first air inlets 2-113, and the second contact surface 2-116 is provided with a plurality of second air inlets. The differential pressure detection tube 2-11 is provided with a high-pressure gas channel 2-111 and a low-pressure gas channel 2-112 inside. The first air inlets 2-113 are all connected to the high-pressure gas channel 2-111, and the second air inlets are all connected to the low-pressure gas channel 2-112. The top of the high-pressure gas channel 2-111 is connected to the first gas channel 3-31, and the low-pressure gas channel 2-112 is connected to the second gas channel 3-32.

[0031] The thermal flow detector 2-2 includes a temperature sensor 2-21, a mass flow rate sensor 2-22 and a heater. The temperature sensor 2-21 and the mass flow rate sensor 2-22 are arranged at the lower end of the differential pressure detection tube 2-11. The heater is arranged inside the differential pressure detection tube 2-11. The heater is connected to the mass flow rate sensor 2-22 to heat the mass flow rate sensor 2-22. The temperature sensor 2-21 and the mass flow rate sensor 2-22 are both electrically connected to the thermal detection module. The temperature of the gas flowing through the pipeline is measured by the temperature sensor 2-21, and the mass flow rate sensor 2-22 is heated by the heater. When the gas in the pipeline flows through, it will take away part of the heat of the mass flow rate sensor 2-22, so that the gas flow rate is calculated by calculating the heat taken away by the gas in the pipeline.

[0032] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A gas flow measurement device, characterized in that: include: A control device (1), the control device (1) comprising a housing (1-1) and a main circuit board (1-2), the housing (1-1) being provided with a cavity inside, the main circuit board (1-2) being installed in the cavity, the main circuit board (1-2) comprising a control module, a differential pressure detection module and a thermal detection module, the differential pressure detection module and the thermal detection module being both electrically connected to the control module; A flow detection assembly (2), the flow detection assembly (2) comprising a differential pressure flow detector (2-1) and a thermal flow detector (2-2), the differential pressure detection module being electrically connected to the differential pressure flow detector (2-1), and the thermal detection module being electrically connected to the thermal flow detector (2-2); A connector (3), one end of the connector (3) being fixedly connected to the control device (1), and the other end of the connector (3) being fixedly connected to the flow detection component (2); The connecting head (3) comprises a catheter seat cover (3-1) and a connecting pipe (3-3); the upper end of the connecting pipe (3-3) is threadedly connected to the catheter seat cover (3-1); a first gas channel (3-31) and a second gas channel (3-32) are arranged in the connecting pipe (3-3); a first ventilation joint (3-33) and a second ventilation joint (3-34) are connected to the upper end surface of the connecting pipe (3-3); the first ventilation joint (3-33) is connected to the first gas channel (3-31); the second gas channel (3-32) is connected to the second ventilation joint (3-34); a differential pressure sensor is arranged in the connecting pipe (3-3); the first ventilation joint (3-33) and the second ventilation joint (3-34) are both connected to the differential pressure sensor; A column (1-11) is fixedly arranged at the lower end of the housing (1-1), a shaft retaining ring (1-12) is arranged on the column (1-11), an annular groove is provided on the circumferential surface of the column (1-11), the shaft retaining ring (1-12) is installed in the annular groove, a limiting plate (1-13) is sleeved on the column (1-11), the limiting plate (1-13) is located above the shaft retaining ring (1-12), and the limiting plate (1-13) is provided on the upper surface of the shaft retaining ring (1-12). The positioning plate (1-13) abuts against the shaft retaining ring (1-12); the shaft retaining ring (1-12), the limiting plate (1-13) and the column (1-11) are inserted into the catheter seat cover (3-1); a pressing plate (3-2) is arranged above the limiting plate (1-13); the pressing plate (3-2) abuts against the limiting plate (1-13); and the pressing plate (3-2) and the catheter seat cover (3-1) are detachably fixedly connected; The differential pressure flow detector (2-1) comprises a differential pressure detection tube (2-11), the differential pressure detection tube (2-11) is fixedly connected to the connecting tube (3-3), a high-pressure gas channel (2-111) and a low-pressure gas channel (2-112) are arranged inside the differential pressure detection tube (2-11), a plurality of first air inlets (2-113) and a plurality of second air inlets (2-114) are arranged on the differential pressure detection tube (2-11), the first air inlets (2-113) are all connected to the high-pressure gas channel (2-111), the second air inlets are all connected to the low-pressure gas channel (2-112), the upper part of the high-pressure gas channel (2-111) is connected to the first gas channel (3-31), and the low-pressure gas channel (2-112) is connected to the second gas channel (3-32).

2. A gas flow measurement device as claimed in claim 1, characterized in that: A display (1-3) is installed in the housing (1-1), and the differential pressure detection module and the thermal detection module are both electrically connected to the display (1-3).

3. A gas flow measurement device as claimed in claim 1, characterized in that: The control device (1) further comprises a cover body (1-4), wherein the cover body (1-4) is mounted on the shell (1-1) to cover the shell (1-1), and a display window is provided on the cover body (1-4).

4. A gas flow measurement device as claimed in claim 1, characterized in that: The upper end of the catheter seat cover (3-1) is provided with a plug-in slot (3-11), the column (1-11) is plugged into the catheter seat cover (3-1), and the lower end of the column (1-11) is provided with a step surface (1-111), and the step surface (1-111) abuts against the bottom surface of the plug-in slot (3-11) for limiting position.

5. A gas flow measurement device as claimed in claim 1, characterized in that: The cross section of the differential pressure detection tube (2-11) is in the shape of a bullet head. The differential pressure detection tube (2-11) comprises a first contact surface (2-115) and a second contact surface (2-116). The first contact surface (2-115) is located at an end of the differential pressure detection tube (2-11) with a smaller size, and the second contact surface (2-116) is located at an end of the differential pressure detection tube (2-11) with a larger size. A plurality of the first air inlets (2-113) are located on the first contact surface (2-115), and a plurality of the second air inlets are located on the second contact surface (2-116).

6. A gas flow measurement device as claimed in claim 1, characterized in that: The thermal flow detector (2-2) comprises a temperature sensor (2-21), a mass flow rate sensor (2-22) and a heater; the temperature sensor (2-21) and the mass flow rate sensor (2-22) are arranged at the lower end of the differential pressure detection tube (2-11); the heater is arranged inside the differential pressure detection tube (2-11); the heater is connected to the mass flow rate sensor (2-22) to heat the mass flow rate sensor (2-22); and the temperature sensor (2-21) and the mass flow rate sensor (2-22) are both electrically connected to the thermal detection module.

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