CN105928669A - Flange connection leakage early warning device - Google Patents

Abstract

The invention relates to a flange connection leakage early warning device, which is characterized in that it includes a flange sealing system and a leakage protection early warning system; the flange sealing system is mainly composed of a pair of metal clamps, and the metal clamps are semicircular It is ring-shaped, and a groove with a rectangular cross-section is opened on the inner side, and the pair of metal clamps cooperate with each other to seal and hold the edge of the flange; the leakage protection early warning system includes a buffer tank, and a pressure gauge is provided on the buffer tank. A spherical valve is provided at the bottom, and an alarm device is connected to the pressure gauge; the buffer tank is communicated with a metal clamp through a leakage medium discharge channel. The device can be applied to complex working conditions such as high temperature, high pressure, vibration, etc. It can maintain good sealing performance for a long time, effectively prevent the leakage of the flange, and can monitor the leakage of the flange in real time. After the leakage occurs, there will be an early warning device. , to prompt personnel to evacuate, and a buffer tank is used as a buffer for leakage to buy time for personnel evacuation.

Description

A flange connection leakage warning device

technical field

The invention relates to the field of flange sealing structures, in particular to a flange connection leakage warning device.

Background technique

The flange sealing structure is widely used in petrochemical industry because of its easy disassembly and assembly. According to statistics, there are tens of thousands of static sealing points in five sets of main devices, six sets of supporting devices and seven auxiliary workshops with an annual output of 30 trillion tons of ethylene in a large petrochemical plant. It is not appropriate to rely on manpower and enhanced patrols to protect and monitor the leakage of flanges in key parts of the entire plant. Because many fluids handled by chemical plants are flammable, explosive, toxic or corrosive working media, and usually have pressure and temperature, once leakage occurs, it will cause material loss and energy loss, resulting in environmental pollution, and production cannot be carried out normally, increasing Unplanned maintenance and downtime, even endangering human health and life safety and other consequences. In the traditional flange connection system, the bolts are subjected to tensile loads, and the bolts will produce stress relaxation effects under high temperature conditions. Traditional bolted connections are prone to loosening or insufficient pre-tightening force and leakage under complex working conditions such as high temperature, high pressure, and vibration, and traditional flange connection structures are difficult to monitor and give early warning after leakage occurs.

Contents of the invention

In view of the above technical problems, the purpose of the present invention is to provide a flange connection leakage warning device, which can be applied to complex working conditions such as high temperature, high pressure, vibration, etc., maintain good sealing performance for a long time, and effectively prevent flange leakage. It can monitor the leakage of the flange in real time. After the leakage occurs, there will be an early warning device to remind personnel to evacuate, and a buffer tank will be used as a buffer for leakage to buy time for personnel to evacuate.

For realizing above-mentioned purpose, the technical scheme that the present invention takes is:

A flange connection leakage early warning device is characterized in that it includes a flange sealing system and a leakage protection early warning system;

The flange sealing system is mainly composed of a pair of metal clamps, the metal clamps are semi-circular, and a groove with a rectangular cross-section is opened on the inner side, and the pair of metal clamps cooperate with each other to seal the edge of the flange. stuck; the surface of the upper flange and the lower flange of the flange is circumferentially distributed with a circle of fixed-depth blind holes, and the pair of metal clamps are provided with bolt holes corresponding to the fixed-depth blind holes. A depth-fixing bolt is screwed into the hole, and the end of the depth-fixing bolt presses against the bottom of the blind hole; the bottom of the inner groove of the metal clamp is provided with two circumferentially arranged rectangular cross-section grooves, and a pair of inner grooves of the metal clamp There are O-rings in the two rectangular cross-section grooves at the bottom, and the two O-rings are respectively in contact with the outer sides of the upper flange and the lower flange for extrusion and sealing; the outer sides of the two ends of the metal clamp are provided with There is a connecting plate with bolt holes, and a pair of metal clamps are fixedly connected through the connecting plate and connecting bolts; the end faces of the two ends of the metal clamps are respectively provided with matching grooves and protrusions. The above-mentioned grooves and protrusions are axially distributed, and there is also a strip pad between the grooves and the protrusions;

The leakage protection early warning system includes a buffer tank, a pressure gauge is provided on the buffer tank, a spherical valve is provided at the bottom of the buffer tank, and an alarm device is connected to the pressure gauge; the buffer tank is connected to the flange sealing system through the leakage medium discharge channel A metal clamp connected through the connection.

The spherical valve is an electronic switch spherical valve, the pressure gauge is an electronic pressure gauge, and the two are connected through a data line or a radio.

The beneficial effects obtained by the present invention are: the device in the present invention can be applied to complex working conditions such as high temperature, high pressure, vibration, etc., maintain good sealing performance for a long time, effectively prevent the leakage of the flange, and can detect the leakage of the flange in real time After the leakage occurs, there will be an early warning device to warn the personnel to evacuate, and a buffer tank will be used as a buffer for the leakage to buy time for the personnel to evacuate. Among them, the fixed-depth bolts used for pre-tightening on the metal clamp are subjected to compressive loads instead of traditional tensile loads, and the relaxation of general high-temperature bolts under compression conditions is less than that under tension conditions, which is different from the traditional flange sealing structure. Compared with the service life of the bolt is improved. The bolt positioning hole of the flange is a blind hole with a fixed depth and no through hole, which enhances the strength and rigidity of the flange, and can be connected by large-diameter bolts, which can reduce the bearing capacity of the bolts and increase the pressing force of the gasket to ensure its connection. Tightness. The inner side of the metal clamp is installed with an O-ring as the second seal. The secondary seal structure makes the sealing effect of the flange better and reduces the number of unplanned maintenance and shutdowns. The early warning device can respond to the leakage quickly and accurately, and can give early warning in time to prompt personnel to evacuate.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic top view of the flange part in the present invention.

Fig. 3 is a structural schematic diagram (ie, a cross-sectional schematic diagram) of the flange sealing system in the present invention.

In the figure: 1—Connecting plate, 2—Metal clamp, 3—Fixed depth bolt, 4—Anti-loosening gasket, 5—Upper flange, 6—O-ring, 7—Rectangular section groove, 8—Leakage Medium discharge channel, 9—buffer tank, 10—pressure gauge, 11—alarm device, 12—spherical valve, 13—gasket, 14—lower flange, 15—strip pad, 16—connecting bolt, 17—fixed Deep blind holes.

detailed description

In order to better understand the present invention, the technical solutions of the present invention will be further described below in conjunction with the embodiments and accompanying drawings (as shown in Figures 1-3).

A flange connection leakage early warning device, which includes a flange sealing system and a leakage protection early warning system;

The flange sealing system is mainly composed of a pair of metal clamps 2, the metal clamps 2 are semi-circular, and a groove with a rectangular cross section is opened on the inner side (that is, the cross section of the metal clamp 2 is "[" type), The pair of metal clamps 2 cooperate with each other to seal and hold the edge of the flange (the flange is composed of the upper flange 5, the lower flange 14 and the gasket 13) (that is, the edge of the flange is completely sealed. wrapped); the surface of the upper flange 5 and the lower flange 14 of the flange (that is, the upper surface of the upper flange 5 and the lower surface of the lower flange 14) is distributed with a circle of deep blind holes in the circumferential direction 17. The pair of metal clamps 2 are provided with bolt holes corresponding to the fixed depth blind holes 17 (that is, corresponding to the number, position and size), and the fixed depth bolts 3 are screwed in the bolt holes (the fixed depth bolts 3 and the An anti-loosening gasket 4 is provided between the metal clamps 2), and the ends of the depth-fixing bolts 3 are pressed against the bottom of the depth-fixing blind hole 17 (the flange surface processing of the upper flange 5 and the lower flange 14 is There is a fixed depth blind hole 17, and after the metal clamp 2 clamps the upper flange 5 and the lower flange 14, the gasket 13 is provided with a pretightening force through the fixed depth bolt 3 to form a first-level seal); The bottom of the inner groove of the metal clamp 2 is provided with two circumferentially arranged rectangular cross-sectional grooves 7, and a pair of metal clamps 2 are provided with O-rings 6 in the two rectangular cross-sectional grooves 7 at the bottom of the inner groove. The O-shaped seal ring 6 is in extrusion-seal contact with the outer sides of the upper flange 5 and the lower flange 14 respectively (the O-ring 6 is installed on the inner side of the metal clamp 2, and the upper flange 5 is extruded after the installation is completed. and the outer side of the flange of the lower flange 14 to form a second-level seal); the outer sides of the two ends of the metal clamp 2 are provided with a connecting plate 1, and a bolt hole is opened on the connecting plate 1, and a pair of metal clamps 2 The connecting plate 1 and the connecting bolt 16 are fixedly connected between them; the end faces of the two ends of the metal clip 2 are respectively provided with matching grooves and protrusions, and the grooves and protrusions are axially distributed, and the grooves and protrusions There is also a strip pad 15 between them (that is, a strip pad 15 is provided in the groove for sealing);

The leakage protection early warning system includes a buffer tank 9, the buffer tank 9 is provided with a pressure gauge 10, and the bottom thereof is provided with a spherical valve 12, and the pressure gauge 10 is also connected with an alarm device 11; the buffer tank 9 is discharged through the leakage medium. The channel 8 communicates with a metal clamp 2 in the flange sealing system (that is, the leakage medium enters the buffer tank 9 through the leakage medium discharge channel 8, and the buffer tank 9 releases pressure through the ball valve 12).

The spherical valve 12 is an electronic switch spherical valve, the pressure gauge 10 is an electronic pressure gauge, and the two are connected by a data line or a radio.

The principle of use of a flange connection leakage warning device: 1. The pressure gauge 10 transmits the measured pressure to the alarm device 11 in the form of a data line or radio, and when the pressure in the buffer tank 9 measured by the pressure gauge 10 reaches the alarm When the preset value of the device is reached, the alarm device will be activated and the alarm will sound to notify personnel to evacuate. 2. When the pressure in the buffer tank 9 measured by the pressure gauge 10 reaches the preset relief value, the switch of the spherical valve 12 will be triggered to release the pressure of the buffer tank 9 .

The above descriptions are only application examples of the present invention, and of course the scope of rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the patent scope of the present invention still belong to the protection scope of the present invention.

Claims (2)

1. A flange connection leakage early warning device is characterized in that: it includes a flange sealing system and a leakage protection early warning system; The flange sealing system is mainly composed of a pair of metal clamps (2). ) cooperate with each other to seal the edge of the flange; the upper flange (5) and the lower flange (14) of the flange are circumferentially distributed with a circle of deep blind holes (17), and the pair of The metal clip (2) is provided with a bolt hole corresponding to the fixed depth blind hole (17), and the fixed depth bolt (3) is screwed in the bolt hole, and the end of the fixed depth bolt (3) is pressed against the fixed depth blind hole ( 17) Bottom; the bottom of the inner groove of the metal clip (2) is provided with two circumferentially arranged rectangular cross-section grooves (7), and a pair of metal clips (2) have two rectangular cross-sectional grooves (7) at the bottom of the inner groove ) are equipped with O-rings (6), and the two O-rings (6) are respectively in contact with the outer surfaces of the upper flange (5) and the lower flange (14) to squeeze and seal; the metal Both ends of the clamp (2) are provided with a connecting plate (1), and a bolt hole is opened on the connecting plate (1), and a pair of metal clamps (2) pass through the connecting plate (1) and the connecting bolt (16) Fixed connection; the end faces of the two ends of the metal clamp (2) are respectively provided with matching grooves and protrusions, the grooves and protrusions are axially distributed, and there are also strip-shaped pad(15); The leakage protection early warning system includes a buffer tank (9), a pressure gauge (10) is provided on the buffer tank (9), a spherical valve (12) is provided at the bottom of the buffer tank (9), and an alarm device ( 11); the buffer tank (9) communicates with a metal clamp (2) in the flange sealing system through the leakage medium discharge channel (8). 2. A flange connection leakage early warning device according to claim 1, characterized in that: the spherical valve (12) is an electronic switch spherical valve, the pressure gauge (10) is an electronic pressure gauge, and between the two Connect via data cable or radio.