Gas pipeline micro flow detection device

Abstract

The utility model relates to the technical field of gas pipeline detection, in particular to a gas pipeline micro flow detection device which comprises a secondary pipeline connected with a main pressure regulator on a main pipeline in parallel, the end, close to the inlet end of the main pipeline, of the secondary pipeline is a gas inlet end, and the end, close to the outlet end of the main pipeline, of the secondary pipeline is a gas outlet end. The secondary pipeline is provided with a secondary pressure regulator and a micro flow metering device in series in the direction from the air inlet end to the air outlet end, and the outlet pressure of the secondary pressure regulator is higher than the closing pressure of the main pressure regulator. By means of the secondary pipeline connected with the main pressure regulator in parallel, the secondary pressure regulator and the micro flow metering device are used in cooperation, the purpose of detecting the micro flow condition of the pipeline at the rear end of the main pressure regulator can be achieved, and later maintenance and safety management are facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of gas pipeline detection, and in particular to a gas pipeline micro-flow detection device. Background Art

[0002] Gas pipeline pressure regulation plays a crucial role in the gas transportation process. Existing gas pipeline pressure regulation systems generally lack flow metering devices installed in series. Even if flow metering devices are installed, the large number of gas-consuming devices connected to the back-end pipelines of the flow metering devices and the high gas demand often require pipelines with relatively high flow rates. Consequently, the flow metering devices installed on the gas pipelines must also be of a model with a relatively large range.

[0003] like Figure 1 As shown, the structure of an existing gas pipeline pressure regulating system generally includes a main pipeline 1, the left end of the main pipeline 1 is an inlet end 11, and the right end is an outlet end 12. A main pressure regulator 2 is connected in series to the main pipeline 1; the main pressure regulator 2 is a gas pressure regulator, and its function is to maintain a specified pressure at the outlet end 12. When the gas flow at the outlet end 12 gradually decreases to a small flow, the pressure in the pipeline behind the main pressure regulator 2 rises. When the pressure reaches or exceeds the closing pressure of the main pressure regulator 2, the main pressure regulator 2 is closed.

[0004] However, for the above-mentioned gas pipeline pressure regulating system, if a flow metering device with a larger range is connected in series with the main pipeline 1 and the main pressure regulator 2, the flow metering device can often only detect larger gas flow values. It is difficult to accurately detect small flow values. Small flow refers to the flow in the range of 0 to 4000L / H. This makes it difficult to control the small flow conditions of the back-end pipeline, which is inconvenient for subsequent maintenance and safety management. Utility Model Content

[0005] In order to solve the problem that the existing gas pipeline system is unable to accurately detect small flow values, resulting in difficulty in controlling the small flow in the back-end pipeline and inconvenience in subsequent maintenance and safety management, the present application provides a gas pipeline small flow detection device.

[0006] This application provides a gas pipeline micro-flow detection device, which adopts the following technical solutions:

[0007] A gas pipeline micro-flow detection device includes a secondary pipeline connected in parallel with a main pressure regulator on the main pipeline, wherein the end of the secondary pipeline close to the inlet end of the main pipeline is the air inlet end, and the end of the secondary pipeline close to the outlet end of the main pipeline is the air outlet end. The secondary pipeline is provided with a secondary pressure regulator and a micro-flow metering device along the direction from the air inlet end to the air outlet end, and the outlet pressure of the secondary pressure regulator is higher than the closing pressure of the main pressure regulator.

[0008] By adopting the above technical solution, when in use, when the gas flow rate in the rear-end pipeline of the main pressure regulator is large, the main pipeline, the main pressure regulator, the secondary pipeline, the secondary pressure regulator and the micro-flow metering device work simultaneously to supply gas to the gas-consuming equipment connected to the rear-end pipeline; when the gas flow rate in the rear-end pipeline is reduced to a micro-flow rate, since the outlet pressure of the secondary pressure regulator is higher than the closing pressure of the main pressure regulator, the main pipeline is closed, and the micro-flow gas only enters the rear-end pipeline of the main pressure regulator through the secondary pipeline. In this process, the flow rate detected by the micro-flow metering device is the actual flow rate of the rear-end pipeline of the main pressure regulator, thereby achieving the purpose of accurately controlling the micro-flow rate of the rear-end pipeline.

[0009] Preferably, a plurality of secondary pressure regulators are provided, and the plurality of secondary pressure regulators are arranged in series on the secondary pipeline.

[0010] By adopting the above technical solution, when in use, the stability of the gas pressure in the secondary pipeline is ensured by connecting several secondary pressure regulators in series, thereby ensuring the accuracy of the detection data of the micro-flow metering device.

[0011] Preferably, a plurality of secondary pressure regulators are provided, and the plurality of secondary pressure regulators are arranged in parallel on the secondary pipeline.

[0012] By adopting the above technical solution, when in use, the gas pressure in the secondary pipeline is stabilized as quickly as possible by connecting several secondary pressure regulators in parallel, thereby ensuring the accuracy of the detection data of the micro-flow metering device.

[0013] Preferably, a first control valve is provided at the air inlet end of the secondary pipeline, and a second control valve is provided at the air outlet end of the secondary pipeline.

[0014] By adopting the above technical solution, when in use, the coordinated use of the first control valve and the second control valve facilitates subsequent maintenance of the secondary pipeline by the staff.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] 1. By connecting a secondary pressure regulator, a micro-flow metering device, and a secondary pipeline in parallel with the main pressure regulator of the main pipeline, and by ensuring that the outlet pressure of the secondary pressure regulator is higher than the closing pressure of the main pressure regulator, when the gas flow in the rear-end pipeline decreases to a micro-flow, the micro-flow metering device can analyze and detect the micro-flow value flowing through the secondary pipeline. This allows for real-time control of the pipeline behind the main pressure regulator, facilitates subsequent maintenance and safety management, reduces the overall safety risk of the gas pipeline, greatly improves pipeline maintenance efficiency, and also enables safety monitoring for different situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram mainly showing the structure of the existing gas pipeline pressure regulating system in the background technology;

[0018] Figure 2 This is a schematic diagram mainly showing the secondary pipeline connection structure in an embodiment of the present application;

[0019] Figure 3 This is a schematic diagram mainly showing the series connection state of the secondary voltage regulators in the embodiment of the present application;

[0020] Figure 4 2 is a schematic diagram mainly showing the parallel connection state of the secondary voltage regulators in the embodiment of the present application.

[0021] Figure numerals: 1. Main pipeline; 11. Inlet end; 12. Outlet end; 2. Main pressure regulator; 3. Secondary pipeline; 31. Air inlet end; 32. Air outlet end; 4. Secondary pressure regulator; 5. Micro flow metering device; 6. First control valve; 7. Second control valve. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1 -Attached Figure 2 This application is described in further detail.

[0023] The embodiment of the present application discloses a gas pipeline micro-flow detection device.

[0024] Reference Figure 2 A gas pipeline micro-flow detection device includes a secondary pipeline 3, the left end of the secondary pipeline 3 is an air inlet end 31, and the right end is an air outlet end 32. The air inlet end 31 of the secondary pipeline 3 is connected to the inlet end 11 of the main pipeline 1, and the air outlet end 32 of the secondary pipeline 3 is connected to the outlet end 12 of the main pipeline 1, that is, the secondary pipeline 3 is arranged in parallel with the main pressure regulator 2 on the main pipeline 1, and a secondary pressure regulator 4 and a micro-flow metering device 5 are installed on the secondary pipeline 3. The secondary pressure regulator 4 and the micro-flow metering device 5 are connected in sequence from the air inlet end 31 of the secondary pipeline 3 to the air outlet end 32 of the secondary pipeline 3, that is, the secondary pressure regulator 4 and the micro-flow metering device 5 are connected in series.

[0025] Reference Figure 2 When the gas flow in the rear-end pipeline of the main pressure regulator 2 decreases to a micro flow, as the pressure in the rear-end pipeline of the main pressure regulator 2 rises until its pressure reaches or exceeds the closing pressure of the main pressure regulator 2, the main pressure regulator 2 is closed. At this time, the gas entering the inlet end 11 of the main pipeline 1 only enters the rear-end pipeline of the main pressure regulator 2 through the secondary pipeline 3, so that the micro flow in the secondary pipeline 3 is monitored in real time by the micro flow metering device 5. The flow detected by the micro flow metering device 5 is the actual flow in the rear-end pipeline.

[0026] Reference Figure 3During the detection process of the micro-flow metering device 5, the secondary pressure regulator 4 is used to ensure the stability of the gas pressure in the secondary pipeline 3, so as to ensure the accuracy of the detection result of the micro-flow metering device 5. At the same time, multiple secondary pressure regulators 4 can be set, and multiple secondary pressure regulators 4 can be set in series on the secondary pipeline 3, so that the pressure stability in the secondary pipeline 3 can be further ensured by the coordinated use of multiple secondary pressure regulators 4.

[0027] Reference Figure 4 In actual use, multiple secondary pressure regulators 4 can also be set in parallel on the secondary pipeline 3, so that the gas pressure in the secondary pipeline 3 can be stabilized as soon as possible through multiple secondary pressure regulators 4, thereby improving the detection rate of the micro-flow metering device 5 while ensuring the detection accuracy of the micro-flow metering device 5.

[0028] Reference Figure 2 In addition, in order to facilitate the staff's later maintenance of the secondary pipeline 3, a first control valve 6 is installed at the air inlet end 31 of the secondary pipeline 3, and a second control valve 7 is installed at the air outlet end 32 of the secondary pipeline 3. The first control valve 6 is used to control the communication between the air inlet end 31 of the secondary pipeline 3 and the inlet end 11 of the main pipeline 1, and the second control valve 7 is used to control the communication between the air outlet end 32 of the secondary pipeline 3 and the outlet end 12 of the main pipeline 1.

[0029] The implementation principle of the embodiment of the present application is: when in use, the device is connected to the main pipeline 1. When the gas flow rate used in the rear-end pipeline of the main pressure regulator 2 is large, the main pipeline 1 and the secondary pipeline 3 simultaneously supply gas to the gas-consuming equipment connected to the rear-end pipeline; when the gas flow rate of the pipeline at the rear-end of the main pressure regulator 2 gradually decreases to a small flow rate, the pressure in the pipeline at the rear-end of the main pressure regulator 2 rises. When the pressure reaches or exceeds the closing pressure of the main pressure regulator 2, the main pipeline 1 is closed, and the small flow rate of gas only enters the rear-end pipeline of the main pressure regulator 2 through the secondary pipeline 3. During the flow of gas, the gas flow rate in the secondary pipeline 3 is detected by the small flow metering device 5. The flow rate detected by the small flow metering device 5 is the actual flow rate of the rear-end pipeline of the main pressure regulator 2. In this way, the purpose of accurately controlling the small flow rate of the rear-end pipeline can be achieved, thereby facilitating the staff's later maintenance and safety management of the gas pipeline.

[0030] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A gas pipeline micro-flow detection device, characterized by: The invention comprises a secondary pipeline (3) connected in parallel with a main pressure regulator on a main pipeline (1); an end of the secondary pipeline (3) close to an inlet end (11) of the main pipeline (1) is an air inlet end (31); an end of the secondary pipeline (3) close to an outlet end (12) of the main pipeline (1) is an air outlet end (32); a secondary pressure regulator (4) and a micro-flow metering device (5) are provided on the secondary pipeline (3) along the direction from the air inlet end (31) to the air outlet end (32); and an outlet pressure of the secondary pressure regulator (4) is higher than the closing pressure of the main pressure regulator (2).

2. A gas pipeline micro-flow detection device according to claim 1, characterized in that: A plurality of the secondary pressure regulators (4) are provided, and the plurality of the secondary pressure regulators (4) are arranged in series on the secondary pipeline (3).

3. A gas pipeline micro-flow detection device according to claim 1, characterized in that: A plurality of the secondary pressure regulators (4) are provided, and the plurality of the secondary pressure regulators (4) are arranged in parallel on the secondary pipeline (3).

4. A gas pipeline micro-flow detection device according to claim 1, characterized in that: The air inlet end (31) of the secondary pipeline (3) is provided with a first control valve (6), and the air outlet end (32) of the secondary pipeline (3) is provided with a second control valve (7).

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