Differential pressure type flow measuring device for low-flow-rate gas

Abstract

The utility model discloses a low-flow-rate gas differential pressure type flow measuring device, which comprises a communicating pipe, an adjusting type differential pressure measuring structure and a pressure measuring device, the adjustable differential pressure measuring structure comprises a circulation inner cavity, a pore plate, a pair of pressure tapping nozzles, a pair of fixing rings, a pair of supporting frames, a pair of measuring pipes, a differential pressure measuring instrument and a turbulence adjusting assembly. The utility model relates to the technical field of measuring devices, and has the beneficial effects that the problem that when an existing differential pressure flow meter is used for adjusting airflow through a pore plate, the flowing airflow has a turbulent flow phenomenon on the right side after passing through the pore plate, and the turbulent flow of the gas can cause pressure loss and influence the pressure measuring effect is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring devices, in particular to a differential pressure type flow measuring device for low-flow gas. Background Technique

[0002] A differential pressure flowmeter is a flow measuring instrument that determines the flow rate by measuring the pressure difference formed by the fluid in the pipeline. Its working principle is based on Bernoulli's law and Ettingshausen's law. When the fluid passes through the measuring device in the pipeline (such as an orifice plate, nozzle, cross-sectional change, etc.), the fluid velocity increases and the pressure drops. By measuring the pressure difference before and after passing through the measuring device, the flow rate of the fluid can be deduced. When the existing differential pressure flowmeter adjusts the air flow through the orifice plate, the flowing air will show a turbulent phenomenon on the right side after passing through the orifice plate. The gas turbulence will cause pressure loss and affect the pressure measurement effect. Content of the Utility Model

[0003] To achieve the above objectives, the utility model is realized through the following technical solutions: a differential pressure type flow measuring device for low-flow gas, comprising: a connecting pipe, on which an adjustable differential pressure measuring structure is installed;

[0004] The adjustable differential pressure measuring structure includes: a flow inner cavity, an orifice plate, a pair of pressure tapping nozzles, a pair of fixing rings, a pair of support frames, a pair of measuring pipes, a differential pressure measuring instrument, and a turbulence regulating component;

[0005] The flow inner cavity is opened inside the connecting pipe. A pair of pressure tapping nozzles are arranged on both sides of the upper wall surface of the connecting pipe. A pair of fixing rings are sleeved on the outer wall surface of the connecting pipe. A pair of support frames are installed on the pair of fixing rings. A pair of measuring pipes are embedded on the pair of support frames. The lower ends of the pair of measuring pipes are installed on the pair of pressure tapping nozzles. The differential pressure measuring instrument is installed at the upper ends of the pair of measuring pipes. The turbulence regulating component is installed inside the flow inner cavity.

[0006] Preferably, connecting flanges are installed at both ends of the connecting pipe.

[0007] Preferably, the turbulence regulating component includes: a pair of fixing frames, a telescopic push rod, a fixing rod, a pair of connecting rods, and a Venturi tube;

[0008] A pair of fixing frames are installed on the upper wall surface of the connecting pipe. The telescopic push rod is embedded on the pair of fixing frames. The fixing rod is installed at the output end of the telescopic push rod. A pair of connecting rods are installed on the lower wall surface of the fixing rod. The Venturi tube is embedded in the flow inner cavity. The lower ends of the pair of connecting rods penetrate through the connecting pipe and are installed on the Venturi tube.

[0009] Preferably, the fixing rod is installed at the output end of the telescopic push rod through a connecting block.

[0010] Preferably, an adjusting groove is opened on the outer wall surface of the connecting pipe.

[0011] Preferably, the Venturi tube is closely fitted with the flow inner cavity.

[0012] Advantageous effects

[0013] The utility model provides a differential pressure type flow measurement device for low-flow gas, which has the following advantageous effects: this solution uses an adjustable differential pressure measurement structure. By adding an adjustment structure to the traditional differential pressure measurement device, the Venturi tube is used to reduce the occurrence of air flow turbulence, and position adjustment is performed according to different gas flow rates to ensure a stable measurement effect. It solves the problem that when the existing differential pressure flowmeter adjusts the air flow through the orifice plate, the flowing air will have a turbulence phenomenon on the right side after passing through the orifice plate, and the gas turbulence will cause pressure loss and affect the pressure measurement effect. Description of the drawings

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the differential pressure type flow measurement device for low-flow gas described in the utility model.

[0015] Figure 2 It is a front view structural schematic diagram of the differential pressure type flow measurement device for low-flow gas described in the utility model.

[0016] Figure 3 It is a side view structural schematic diagram of the differential pressure type flow measurement device for low-flow gas described in the utility model.

[0017] Figure 4 It is a front view sectional structural schematic diagram of the connecting pipe of the differential pressure type flow measurement device for low-flow gas described in the utility model.

[0018] In the figure: 1 - connecting pipe; 2 - flow inner cavity; 3 - orifice plate; 4 - pressure tapping nozzle; 5 - fixing ring; 6 - support frame; 7 - measuring pipe; 8 - differential pressure measuring instrument; 9 - connecting flange; 10 - fixing frame; 11 - telescopic push rod; 12 - fixing rod; 13 - connecting rod; 14 - Venturi tube; 15 - connecting block; 16 - adjustment groove. Specific embodiments

[0019] Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model.

[0020] Embodiment: Please refer to Figures 1-4 , the utility model provides a technical solution: a differential pressure type flow measurement device for low-flow gas. This solution takes into account that the traditional differential pressure flowmeter will affect the measurement effect due to the turbulence phenomenon during measurement, resulting in pressure loss and affecting the measurement accuracy. Based on the above content, the following technical means are set in this case;

[0021] Specifically, this device at least includes a connecting pipe 1, a flow inner cavity 2, an orifice plate 3, a pair of pressure tapping nozzles 4, a pair of fixing rings 5, a pair of support frames 6, a pair of measuring pipes 7, a differential pressure measuring instrument 8, and a turbulence regulating component;

[0022] The turbulence regulating component includes: a pair of fixing frames 10, a telescopic push rod 11, a fixing rod 12, a pair of connecting rods 13, and a Venturi tube 14;

[0023] The connecting pipe 1 is installed in the middle position of the pipeline through the connecting flanges 9 installed on both sides. After the gas flows into the flow inner cavity 2, the left pressure tapping nozzle 4 cooperates with the left measuring pipe 7 to measure the left air pressure. When the gas passes through the orifice plate 3 to generate a pressure difference, the right pressure tapping nozzle 4 cooperates with the right measuring pipe 7 to measure the right pressure through the differential pressure measuring instrument 8, so as to calculate the pressure difference by comparison. When the gas passing through the orifice plate 3 generates a turbulence phenomenon, it enters the Venturi tube 14. The good fluid stability of the Venturi tube 14 prevents the gas flow from generating a turbulence phenomenon. According to different gas flow rates, the output end of the telescopic push rod 11 installed on the fixing frame 10 extends and retracts, and through the cooperation of the fixing rod 12 and the connecting rod 13, the Venturi tube 14 is driven to adjust its position, protecting the flowing gas and effectively preventing the occurrence of turbulence.

[0024] Furthermore, the flow inner cavity 2 is opened inside the connecting pipe 1. A pair of pressure tapping nozzles 4 are pre-mounted on both sides of the upper wall surface of the connecting pipe 1. A pair of fixing rings 5 are sleeved on the outer wall surface of the connecting pipe 1. A pair of support frames 6 are installed on the pair of fixing rings 5. A pair of measuring pipes 7 are embedded on the pair of support frames 6. The lower ends of the pair of measuring pipes 7 are installed on the pair of pressure tapping nozzles 4. The differential pressure measuring instrument 8 is installed at the upper ends of the pair of measuring pipes 7. The turbulence regulating component is installed inside the flow inner cavity 2;

[0025] A pair of fixing frames 10 are installed on the upper wall surface of the connecting pipe 1. The telescopic push rod 11 is embedded on the pair of fixing frames 10. The fixing rod 12 is installed at the output end of the telescopic push rod 11. A pair of connecting rods 13 are installed on the lower wall surface of the fixing rod 12. The Venturi tube 14 is embedded in the flow inner cavity 2. The lower ends of the pair of connecting rods 13 penetrate through the connecting pipe 1 and are installed on the Venturi tube 14.

[0026] In the specific implementation process, furthermore, connecting flanges 9 are installed at both ends of the connecting pipe 1.

[0027] In the specific implementation process, furthermore, the fixing rod 12 is installed at the output end of the telescopic push rod 11 through a connecting block 15.

[0028] In the specific implementation process, furthermore, an adjustment groove 16 is opened on the outer wall surface of the connecting pipe 1.

[0029] In the specific implementation process, furthermore, the Venturi tube 14 is closely fitted with the flow inner cavity 2.

[0030] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A differential pressure type flow measurement device for low flow rate gases, comprising: A connecting pipe (1), characterized in that an adjustable differential pressure measuring structure is installed on the connecting pipe (1). The adjustable differential pressure measuring structure includes: a flow-through inner cavity (2), an orifice plate (3), a pair of pressure tapping nozzles (4), a pair of fixing rings (5), a pair of support frames (6), a pair of measuring pipes (7), a differential pressure measuring instrument (8), and a turbulence regulating assembly. The flow-through inner cavity (2) is opened inside the connecting pipe (1). A pair of pressure tapping nozzles (4) are pre-installed on both sides of the upper wall surface of the connecting pipe (1). A pair of fixing rings (5) are sleeved on the outer wall surface of the connecting pipe (1). A pair of support frames (6) are installed on the pair of fixing rings (5). A pair of measuring pipes (7) are embedded in the pair of support frames (6). The lower ends of the pair of measuring pipes (7) are installed on the pair of pressure tapping nozzles (4). The differential pressure measuring instrument (8) is installed at the upper ends of the pair of measuring pipes (7). The turbulence regulating assembly is installed inside the flow-through inner cavity (2).

2. The differential pressure type flow measurement device for low flow rate gas according to claim 1, wherein Connection flanges (9) are installed at both ends of the connecting pipe (1).

3. A differential pressure type flow measuring device for low flow rate gases according to claim 1, characterized in that, The turbulence regulating assembly includes: a pair of fixing frames (10), a telescopic push rod (11), a fixing rod (12), a pair of connecting rods (13), and a Venturi tube (14). A pair of fixing frames (10) are installed on the upper wall surface of the connecting pipe (1). The telescopic push rod (11) is embedded in the pair of fixing frames (10). The fixing rod (12) is installed at the output end of the telescopic push rod (11). A pair of connecting rods (13) are installed on the lower wall surface of the fixing rod (12). The Venturi tube (14) is embedded in the flow-through inner cavity (2). The lower ends of the pair of connecting rods (13) penetrate through the connecting pipe (1) and are installed on the Venturi tube (14).

4. A differential pressure type flow measuring device for low flow rate gases according to claim 3, characterized in that, The fixing rod (12) is installed at the output end of the telescopic push rod (11) through a connecting block (15).

5. A differential pressure type flow measuring device for low flow rate gas according to claim 3, characterized in that, An adjustment groove (16) is opened on the outer wall surface of the connecting pipe (1).

6. The differential pressure type flow measurement device for low flow rate gas according to claim 3, wherein The Venturi tube (14) is in close fit with the flow-through inner cavity (2).

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