Natural gas pipeline monitoring alarm device

Abstract

The utility model discloses a natural gas pipeline monitoring alarm device, relates to the technical field of monitoring alarm devices, and is used for saving pipeline monitoring resources and materials. The device comprises connecting ends which are connected to the opposite end faces of two adjacent gas conveying pipelines respectively, a middle pipe is arranged between the two connecting ends, the two adjacent gas conveying pipelines are communicated through the middle pipe, and the two connecting ends are connected through a first bolt; a pair of measuring pipes is connected to the centrally-arranged pipe, the two measuring pipes are respectively connected with accommodating ends, air valves are arranged in the accommodating ends, the two accommodating ends are respectively connected with transmission pipes, and the two transmission pipes are respectively communicated with the two ends of the differential pressure measurer; and the differential pressure measurer is connected with a differential pressure alarm. Compared with an existing natural gas pipeline monitoring and alarming device, the natural gas pipeline monitoring and alarming device is installed at the position of a connector of each section of gas conveying pipeline, so that detection of the device only needs to be carried out for a certain distance, and more resources and materials can be saved relatively.

Description

Technical Field

[0001] The utility model relates to the technical field of monitoring alarm devices, in particular to a natural gas pipeline monitoring alarm device. Background Art

[0002] The pipeline that transports natural gas (including associated gas produced in oil fields) from the mining site or processing plant to the urban gas distribution center or industrial enterprise user is also called a gas transmission pipeline. Using natural gas pipelines to transport natural gas is the only way to transport natural gas in large quantities on land. With the development of society, the use of natural gas is constantly increasing. Natural gas pipelines are affected by the environment during the transportation of natural gas and often leak. However, the existing leakage monitoring method has the disadvantages of requiring electrical detection, low detection accuracy, poor stability, and short service life. To address the above problems, an innovative design is made based on the original natural gas pipeline leakage detection technology based on sensor monitoring.

[0003] For example, the Chinese patent document with announcement number CN205859619U proposes a natural gas pipeline leakage alarm device using sensor monitoring, which includes a data display screen, a first optical cable connector, a processor and an optical fiber temperature sensor. The upper end of the data display screen is connected to an alarm light, and a control panel is installed below it. Speakers are fixed on the left and right sides of the control panel. An organic body is set on the left side of the first optical cable connector, and a second optical cable connector is connected below it. The processor is electrically connected to the internal unit of the speaker below and to the right side of the processor. The first optical cable connector is connected to a light source through an optical cable. A natural gas pipeline is installed on the inner side of the optical cable, and an optical cable is set on the outer side of the optical fiber temperature sensor.

[0004] The device uses optical fiber temperature sensors for detection, replacing the traditional electrical detection method, and overcomes the shortcomings of traditional optical sensors that rely on light intensity. Multiple optical fiber temperature sensors sense simultaneously, with high detection accuracy and a detection distance of up to tens of kilometers. The processing system can accurately determine the location of leaks and leak points, realizing online monitoring of natural gas management. It is not easily affected by environmental factors, has good stability, long service life, and is simple to operate and easy to use.

[0005] However, due to the long length of natural gas pipelines, especially the huge amount used in the West-East Gas Transmission Project, this detection device consumes a lot of resources and is not suitable for large-scale use. Utility Model Content

[0006] The purpose of the invention of the utility model is to provide a natural gas pipeline monitoring and alarm device to address the above-mentioned problems, so as to save resources and materials for pipeline monitoring, and to realize large-scale installation and application by combining the characteristics that the gas pipeline is connected in sections.

[0007] The technical solutions adopted in this utility model are as follows:

[0008] A natural gas pipeline monitoring and alarm device includes connecting ends connected to opposite end surfaces of two adjacent gas pipelines, an intermediate pipe is arranged between the two connecting ends, the intermediate pipe connects the two adjacent gas pipelines, and the two connecting ends are connected by a first bolt;

[0009] A pair of measuring tubes are connected to the middle tube, and the two measuring tubes are respectively connected to a receiving end, wherein an air valve is provided in the receiving end, and the two receiving ends are respectively connected to a transmission tube, and the two transmission tubes are respectively connected to the two ends of the differential pressure measuring device;

[0010] The differential pressure measuring device is connected to a differential pressure alarm.

[0011] Furthermore, the differential pressure alarm is an audible and visual alarm.

[0012] Furthermore, the differential pressure measuring device is also connected to a differential pressure display meter.

[0013] Furthermore, the measuring tube is connected to the central tube via a height adjustment end.

[0014] Furthermore, the inner ring connected to the end is connected to the end face of the gas pipeline through a second bolt.

[0015] Furthermore, a junction port is provided on the inner ring connected to the end, and an engaging port is provided at the junction port corresponding to the position of the gas transmission pipeline, and the output pipeline is mechanically engaged with the engaging port connected to the end.

[0016] Furthermore, a flange is provided on the inner ring of the connecting end, and the flange extends into the gas pipeline connected to the connecting end.

[0017] Furthermore, the first bolt is a stud bolt, which passes through two connecting ends and is respectively connected to a nut at both ends.

[0018] Furthermore, a protective layer is provided on the inner layer of the end portion of the gas transmission pipeline.

[0019] Furthermore, the air valve at the receiving end is connected to a rotating end, and the rotating end is connected to a hand crank handle.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] 1. Considering that natural gas pipelines are connected through sections of pipe, when repairing leaky pipelines, the section is often replaced directly, thus eliminating the need to monitor every part of the pipeline. Compared with existing natural gas pipeline monitoring and alarm devices, this device is installed at the connection point of each section of the gas pipeline, so that the device only needs to monitor a certain distance, which is relatively more resource-efficient.

[0022] 2. The monitoring and alarm device of this design is equipped with a differential pressure flowmeter inside. The differential pressure flowmeter is one of the most common methods for gas flow measurement. Based on the Bernoulli principle, the gas flow rate is calculated by measuring the pressure difference between two points inside the pipeline, and the values ​​between them are used to determine whether there is a gas leak in the middle. The principle is simple and the detection is rapid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an overview of the right side of the utility model;

[0024] Figure 2 This is an overview of the left side of the utility model;

[0025] Figure 3 This is an overview of the front of the present invention.

[0026] In the figure: gas transmission pipeline 1, connecting end 2, second bolt 3, protective layer 4, first bolt 5, middle tube 6, height adjustment end 7, measuring tube 8, receiving end 9, differential pressure measuring device 10, differential pressure display meter 11, hand crank handle 12, rotating end 13, differential pressure alarm 14, warning light 15, sound end 16, transmission pipe 17. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings.

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The natural gas transmission pipelines are all connected in sections in sequence, and the natural gas pipeline monitoring and alarm devices are installed at the end connections of adjacent gas transmission pipelines 1.

[0030] like Figures 1 to 3As shown, the natural gas pipeline monitoring and alarm device includes connecting ends 2 connected to the opposite end faces of two adjacent gas pipelines 1, and a central pipe 6 is placed between the two connecting ends 2 to connect the two adjacent gas pipelines 1. The connecting ends 2 are generally in the shape of flange plates. The two connecting ends 2 are connected by a first bolt 5 to achieve the connection between the two adjacent gas pipelines 1, and at the same time, the central pipe 6 is firmly clamped between the two gas pipelines 1. Figure 1 As shown, the first bolt 5 can be a stud bolt structure. After the stud bolt is passed through the flange holes of the two connected ends 2, the connection between the two connected ends 2 is achieved by tightening nuts at both ends.

[0031] In some embodiments, the inner ring connected to the end 2 is connected to the end face of the gas pipeline 1 via the second bolt 3 , that is, the connection to the end 2 is made axially rather than circumferentially of the gas pipeline 1 .

[0032] Specifically, a joint is provided on the inner ring connected to end 2. This joint corresponds to a meshing opening provided at the position of gas pipeline 1. Gas pipeline 1 and the meshing opening connected to end 2 are mechanically meshed. The so-called mechanical meshing connection forms a mechanical meshing joint between the two. A secure connection is then achieved by tightening the second bolt 3.

[0033] In addition, since the device is connected to the end of the gas pipeline 1, it is an invasive connection method. In order to prevent the risk of leakage caused by the reduction of sealing at the end of the gas pipeline 1 due to the installation of the device at the interface, a protective layer 4 is provided on the inner layer of the end of the gas pipeline 1, and the protective layer 4 is made of sealing material.

[0034] A pair of measuring tubes 8 are connected to the center tube 6 to respectively lead out air pressure detection points in the center tube 6. The two measuring tubes 8 are respectively connected to a receiving end 9, and a gas valve is provided in the receiving end 9. By opening or closing the gas valve, the device can control the on / off of the natural gas transmission process, and also serves as a partition device between the differential pressure measuring device 10. In some embodiments, the gas valve in the receiving end 9 is connected to a rotating end 13, and the rotating end 13 is connected to a hand crank 12. By moving the hand crank 12 to rotate, the rotating end 13 is rotated to open or close the gas valve. The two receiving ends 9 are respectively connected to a transmission pipe 17, and the two transmission pipes 17 are respectively connected to the two ends of the differential pressure measuring device 10.

[0035] In addition, since the measuring tube 8 is inserted between the first bolts 5, a height adjustment end 7 is provided to prevent contact and collision between the two. The measuring tube 8 is connected to the middle tube 6 through the height adjustment end 7. The measuring tube 8 is connected to the height adjustment end 7, and the height of the measuring tube 8 is adjusted through the height adjustment end 7.

[0036] The differential pressure measuring device 10 detects the differential pressure of the natural gas transported by the measuring pipe 8 and is connected to a differential pressure alarm 14 to transmit the detected data to the differential pressure alarm 14. When the numerical deviation exceeds a set amount, the differential pressure alarm 14 will issue an alarm.

[0037] In some embodiments, the differential pressure alarm 14 is an audible and visual alarm, on which a warning light 15 is installed, and an audible terminal 16 is installed on the front or other positions to send out alarm information through audible and visual signals.

[0038] In addition, the differential pressure measuring device 10 is preferably connected to a differential pressure display gauge 11, which displays the detected differential pressure data. The differential pressure display gauge 11 is a common pointer-type analog pressure gauge. The differential pressure display gauge 11 installed at each section of the gas pipeline 1 can effectively determine whether the differential pressure between each section of the gas pipeline 1 is the same, thereby determining whether there is a gas leak.

[0039] In actual use, the device is first installed along the end of the gas pipeline 1. As natural gas is transported, the device's measuring tube 8 receives the internal natural gas. Opening the hand crank 12 on the receiving end 9 allows the natural gas to pass through the upper differential pressure measuring device 10 and then out the other end. The value measured by the differential pressure measuring device 10 is then transmitted to the differential pressure display meter 11, which displays the current differential pressure on an external dial. When the value measured by the differential pressure measuring device 10 exceeds a set value, the differential pressure alarm 14 will sound an alarm.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A natural gas pipeline monitoring and alarm device, characterized in that: It comprises connecting ends (2) respectively connected to opposite end surfaces of two adjacent gas transmission pipelines (1), an intermediate pipe (6) is arranged between the two connecting ends (2), the intermediate pipe (6) connects the two adjacent gas transmission pipelines (1), and the two connecting ends (2) are connected by a first bolt (5); A pair of measuring tubes (8) are connected to the middle tube (6), and the two measuring tubes (8) are respectively connected to a receiving end (9), an air valve is provided in the receiving end (9), and the two receiving ends (9) are respectively connected to a transmission tube (17), and the two transmission tubes (17) are respectively connected to the two ends of the differential pressure measuring device (10); The differential pressure measuring device (10) is connected to a differential pressure alarm (14).

2. The natural gas pipeline monitoring and alarm device according to claim 1, characterized in that: The differential pressure alarm (14) is an audible and visual alarm.

3. The natural gas pipeline monitoring and alarm device according to claim 1, characterized in that: The differential pressure measuring device (10) is also connected to a differential pressure display meter (11).

4. The natural gas pipeline monitoring and alarm device according to claim 1, characterized in that: The measuring tube (8) is connected to the center tube (6) via a height adjustment end (7).

5. The natural gas pipeline monitoring and alarm device according to claim 1, characterized in that: The inner ring connected to the end (2) is connected to the end face of the gas transmission pipeline (1) via a second bolt (3).

6. The natural gas pipeline monitoring and alarm device according to claim 5, characterized in that: The inner ring of the connecting end (2) is provided with a junction, and the junction is provided with an engagement opening corresponding to the position of the gas pipeline (1), and the gas pipeline (1) is mechanically engaged with the engagement opening of the connecting end (2).

7. The natural gas pipeline monitoring and alarm device according to claim 1, characterized in that: A flange is provided on the inner ring of the connecting end (2), and the flange extends into the gas pipeline (1) connected to the connecting end (2).

8. The natural gas pipeline monitoring and alarm device according to claim 1, characterized in that: The first bolt (5) is a stud bolt, which passes through the two connecting ends (2) and is connected to a nut at each end.

9. The natural gas pipeline monitoring and alarm device according to claim 1, characterized in that: A protective layer (4) is provided on the inner layer of the end portion of the gas transmission pipeline (1).

10. The natural gas pipeline monitoring and alarm device according to claim 1, characterized in that: The air valve of the receiving end (9) is connected to a rotating end (13), and the rotating end (13) is connected to a hand crank handle (12).

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