Flange sealing device

Abstract

The present invention provides a flange sealing device, which is used on a process pipeline in an oil and gas station, and includes: an annular sealing gasket and two relatively arranged groove flanges, the annular sealing gasket is sandwiched between the two groove flanges; the groove flange has a first end and a second end, the first end is used to connect with the pipeline, the second ends of the two groove flanges are relatively arranged, and an annular sealing groove capable of accommodating the annular sealing gasket is arranged on the end surface of the second end of the two groove flanges; a grease injection channel is arranged on the groove flange, the grease injection channel has a grease inlet and a grease outlet, the grease inlet is connected to the outside, a grease injection check valve is arranged at the grease inlet, the grease outlet is arranged between the annular sealing groove and the inner hole, and is connected to the junction of the annular sealing groove and the annular sealing gasket, so that the sealing grease flowing out of the grease outlet flows to the junction under the thrust of the medium in the pipeline to seal the junction. The present invention can seal the junction without stopping the process pipeline to ensure production efficiency.

Description

Technical Field

[0001] The invention relates to the field of oil and gas exploitation and transportation, and in particular to a flange sealing device. Background Art

[0002] In order to control the flow of media in process pipelines in oil and gas stations, control valves or other devices are generally installed in different sections of process pipelines. The control valves or other devices need to be connected to the process pipelines through two bevel flanges. Figure 1 As shown, in order to ensure that the process pipeline and the control valve or other device can maintain good sealing performance and pressure bearing capacity after being connected through two bevel flanges, corresponding sealing grooves 112 are usually set on the connecting surfaces of the two bevel flanges 110, and a sealing steel ring 120 is set between the two corresponding sealing grooves 112. Then, the two bevel flanges 110 are fastened by fasteners 130 to squeeze the sealing steel ring 120 to achieve sealing.

[0003] After the process pipeline is put into production, when the temperature or pressure of the medium in the pipeline changes, or when the medium in the pipeline is highly corrosive, it may cause leakage or puncture at the sealing surface formed by the sealing steel ring and the sealing groove. In the prior art, when leakage or puncture at the sealing surface formed by the sealing steel ring and the sealing groove is encountered, the sealing steel ring will first be further compressed by tightening the flange in order to restore the seal. When the tightening method cannot eliminate the leakage or puncture, the sealing of the sealing surface formed by the sealing groove and the sealing steel ring can only be restored by replacing the flange or the sealing steel ring.

[0004] However, when replacing flanges or sealing steel rings, the pipeline needs to be depressurized, and even industrial hot work and other operating procedures are required, which will cause the process pipeline to be shut down for too long, seriously affecting the production efficiency of the process pipeline. Summary of the invention

[0005] The present invention provides a flange sealing device, which can repair the sealing joint of the flange and restore the sealing performance without stopping the production of the process pipeline, so as to ensure the production efficiency of the process pipeline.

[0006] The present invention provides a flange sealing device, which is used on a process pipeline in an oil and gas station, and comprises: an annular sealing gasket and two oppositely arranged bevel flanges, wherein the annular sealing gasket is sandwiched between the two bevel flanges;

[0007] The bevel flange has a first end and a second end, the first end of the bevel flange is used to connect to the pipeline, the second ends of the two bevel flanges are arranged opposite to each other, and an annular sealing groove capable of accommodating the annular sealing gasket is arranged on the end surfaces of the second ends of the two bevel flanges, and the annular sealing groove is arranged around the inner hole of the bevel flange;

[0008] A grease injection channel is provided on the bevel flange, and the grease injection channel has a grease inlet and a grease outlet. The grease inlet is connected to the outside, and a grease injection check valve is provided at the grease inlet. The grease outlet is provided between the annular sealing groove and the inner hole, and is connected to the joint of the annular sealing groove and the annular sealing gasket, so that the sealing grease flowing out of the grease outlet flows to the joint under the thrust of the medium in the pipeline to seal the joint.

[0009] The flange sealing device as described above, optionally, the grease injection channel includes a first channel section and a second channel section;

[0010] The first end of the first channel section is communicated with the grease inlet, the second end of the first channel section is communicated with the first end of the second channel section, and the second end of the second channel section is communicated with the grease outlet.

[0011] In the flange sealing device as described above, optionally, the first channel section is perpendicular to the bevel surface of the bevel flange.

[0012] As for the flange sealing device as described above, optionally, the second channel section is perpendicular to the end surface of the second end of the bevel flange.

[0013] As for the flange sealing device as described above, optionally, there are at least two grease injection channels, and at least two of the grease injection channels are arranged at intervals on the bevel flange.

[0014] In the flange sealing device as described above, optionally, at least two of the grease injection channels are evenly distributed along the circumference of the bevel flange.

[0015] As for the flange sealing device as described above, optionally, the grease outlet is arranged close to the annular sealing groove.

[0016] As for the flange sealing device as described above, optionally, the grease injection check valve is connected to the hole wall of the grease inlet through a threaded seal.

[0017] In the flange sealing device as described above, optionally, the annular sealing groove is coaxially arranged with the inner hole.

[0018] In the flange sealing device as described above, optionally, the hardness of the annular sealing gasket is smaller than the hardness of the bevel flange.

[0019] The flange sealing device of the present invention is used on the process pipeline in the oil and gas station, and comprises: an annular sealing gasket and two oppositely arranged groove flanges, the annular sealing gasket is sandwiched between the two groove flanges; the groove flange has a first end and a second end, the first end is used to connect with the pipeline, the second ends of the two groove flanges are oppositely arranged, and the end faces of the second ends of the two groove flanges are provided with annular sealing grooves that can accommodate the annular sealing gasket, and the annular sealing grooves are arranged around the inner holes of the groove flanges; a grease injection channel is provided on the groove flange, the grease injection channel has a grease inlet and a grease outlet, the grease inlet is connected to the outside, and a grease injection check valve is provided at the grease inlet, so that the sealing grease can be injected into the internal space of the flange sealing device from the grease inlet, while the medium in the pipeline is not injected into the inner space of the flange sealing device. The grease will not flow out of the grease inlet due to the obstruction of the grease injection check valve. The grease outlet is arranged between the annular sealing groove and the inner hole and is connected with the joint of the annular sealing groove and the annular sealing gasket, so that the sealing grease flowing out of the grease outlet can flow to the joint of the annular sealing groove and the annular sealing gasket under the thrust of the medium in the pipeline. Then, the sealing grease gathered near the joint will be carried into the leakage or puncture gap by the medium near the leakage or puncture, and accumulate in the gap to form a filling blockage, blocking the leakage or puncture to restore the sealing of the flange sealing device, so as to achieve the repair of the sealing joint of the flange and the restoration of the sealing of the flange sealing device without stopping the production of the process pipeline, thereby ensuring the production efficiency of the process pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a structural schematic diagram of a flange sealing device in the prior art;

[0022] Figure 2 A schematic structural diagram of a flange sealing device provided in one embodiment of the present invention;

[0023] Figure 3 A schematic structural diagram of another flange sealing device provided by an embodiment of the present invention;

[0024] Figure 4 A schematic structural diagram of another flange sealing device provided in one embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 110, 210-bevel flange;

[0027] 112-sealing groove;

[0028] 120-sealing steel ring;

[0029] 130, 230-fasteners;

[0030] 212-annular sealing groove;

[0031] 213-inner hole;

[0032] 214- Grease injection channel;

[0033] 2141-first channel section;

[0034] 2142-Second channel section;

[0035] 214a- grease inlet;

[0036] 214b- grease outlet;

[0037] 215- Grease injection check valve;

[0038] 220-ring seal;

[0039] 221-Joint. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “top”, “bottom”, “upper” and “lower” (if any) are based on the orientations or positional relationships shown in the accompanying 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.

[0042] 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 the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0043] The terms "first" and "second" in the specification and claims of the present application and the above-mentioned figure descriptions are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0044] In the process pipelines of oil and gas stations, it is common to connect two bevel flanges and fasten them with fasteners to achieve the connection between the pipe sections. At the same time, in order to ensure the sealing performance and pressure bearing capacity after the connection, corresponding sealing grooves are usually set on the butt surfaces of the two bevel flanges, and the sealing steel ring is clamped between the two corresponding sealing grooves. Under the tightening action of the fasteners, the two bevel flanges squeeze the sealing steel ring through the sealing groove to meet the sealing and pressure requirements of the process pipeline. In the actual production process of the process pipeline, the sealing surface between the sealing groove and the sealing steel ring will have leakage gaps due to the temperature or pressure changes of the medium in the pipeline, and will also corrode the sealing surface due to the strong corrosiveness of the medium in the pipeline. Leakage gaps, coupled with changes in external temperature, will cause the fasteners to loosen, resulting in failure of the seal between the sealing groove and the sealing steel ring.

[0045] When solving the problem of leakage or puncture leakage on the sealing surface between the sealing groove and the sealing steel ring, the prior art generally tightens the fasteners connecting the two bevel flanges so that the sealing groove can further press the sealing steel ring to eliminate the leakage gap or puncture gap. When the tightening method is ineffective, the prior art can only restore the sealing between the sealing groove and the sealing steel ring by replacing the bevel flange or the sealing steel ring.

[0046] However, in the prior art, when replacing the bevel flange or the sealing steel ring, it is necessary to first shut down the process pipeline to release the pressure, then disassemble the bevel flange and the sealing steel ring, and inspect the sealing groove and the sealing steel ring to determine the bevel flange and / or sealing steel ring that needs to be replaced. After the replacement is completed, they are reassembled and connected, and the seal is tested. The entire replacement process will take a relatively long time, that is, the process pipeline needs to be shut down for a relatively long time, which seriously affects the production efficiency of the process pipeline.

[0047] In order to solve the above-mentioned technical problems existing in the prior art, the present invention provides a flange sealing device, which is provided with a grease injection channel. When seepage or puncture occurs at the joint between the annular sealing groove and the annular sealing gasket of the flange sealing device, sealing grease can be injected into the joint between the annular sealing groove and the annular sealing gasket through the grease injection channel without stopping the process pipeline to fill the leakage gap or puncture gap at the joint. This not only can restore the sealing performance of the flange sealing device, but also ensures the production efficiency of the process pipeline.

[0048] The flange sealing device of the present invention is described in detail below through specific embodiments:

[0049] Figure 2 A schematic structural diagram of a flange sealing device provided in one embodiment of the present invention. Figure 3 A schematic structural diagram of another flange sealing device provided in one embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of another flange sealing device provided by an embodiment of the present invention. This embodiment provides a flange sealing device.

[0050] The flange sealing device is commonly used on process pipelines in oil and gas stations. The flange sealing device includes an annular sealing gasket 220 and two oppositely arranged bevel flanges 210 , wherein the annular sealing gasket 220 is sandwiched between the two bevel flanges 210 .

[0051] Among them, the annular sealing gasket 220 can be made of metal materials, such as a sealing steel ring; it can also be made of polymer materials, such as polytetrafluoroethylene; it can also be made of any other material that can meet the functional and performance requirements of the annular sealing gasket 220 of the present invention, and no specific restrictions are made here.

[0052] The bevel flange 210 has a first end and a second end, wherein the first end of the bevel flange 210 is an end having a beveled surface, and the second end of the bevel flange 210 is an end of a plane opposite to the first end of the bevel flange 210; the first end of the bevel flange 210 is used to connect to the pipeline, and the specific connection method with the pipeline can be a threaded connection or a welding; the second ends of the two bevel flanges 210 are arranged opposite to each other, and an annular sealing groove 212 for accommodating an annular sealing gasket 220 is arranged on the end faces of the second ends of the two bevel flanges 210, and the annular sealing groove 212 is arranged around the inner hole 213 of the bevel flange 210. Generally, the shape of the annular sealing groove 212 is circular, and the annular sealing gasket 220 needs to be placed in the annular sealing groove 212, so the shape of the annular sealing gasket 220 is also circular.

[0053] At the same time, a grease injection channel 214 is provided on the groove flange 210, and the grease injection channel 214 has a grease inlet 214a and a grease outlet 214b. The grease inlet 214a is connected to the outside, and a grease injection check valve 215 is provided at the grease inlet 214a. The grease injection check valve 215 can conduct the direction from the grease inlet 214a to the grease outlet 214b, and block the direction from the grease outlet 214b to the grease inlet 214a, so that a grease gun or other equipment that can be used for grease injection can inject the sealing grease into the grease injection channel 214 through the grease injection check valve 215 at the grease inlet 214a and flow into the internal space of the flange sealing device through the grease outlet 214b, so that the sealing grease from the pipeline can be The medium entering the internal space of the flange sealing device cannot pass through the grease injection channel 214 and flow to the outside from the grease injection check valve 215 at the grease inlet 214a; the grease outlet 214b is arranged between the annular sealing groove 212 and the inner hole 213, and is connected to the joint 221 of the annular sealing groove 212 and the annular sealing gasket 220, so that the sealing grease flowing out from the grease outlet 214b flows to the joint 221 of the annular sealing groove 212 and the annular sealing gasket 220 under the thrust of the medium in the pipeline to seal the joint 221, wherein sealing particles can be added to the sealing grease to increase the leak-proof effect of the sealing grease, improve the sealing ability of the sealing grease and the reliability after sealing.

[0054] In specific implementation, when the flange sealing device is in use, the pressure or temperature change of the medium in the pipeline causes leakage or puncture at the joint 221 between the annular sealing groove 212 and the annular sealing gasket 220 of the flange sealing device; or, when the medium in the pipeline is highly corrosive and corrodes the annular sealing groove 212 of the bevel flange 210 or the edge of the annular sealing gasket 220 into a pit, causing leakage or puncture at the joint 221 between the annular sealing groove 212 and the annular sealing gasket 220; first, the fasteners 230 connecting the two bevel flanges 210 can be tightened to compress the annular sealing gasket 220 to restore the seal. When the fasteners 230 of the two bevel flanges 210 cannot eliminate the leakage or puncture, a grease gun or other grease injection equipment can be used with the bevel method. The grease injection check valve 215 at the grease inlet 214a of the flange 210 is connected to inject the sealing grease into the grease injection channel 214 and flow into the internal space of the flange sealing device through the grease outlet 214b. At this time, since the medium entering the internal space of the flange sealing device from the pipeline has a certain pressure, and the pressure diffuses from the inner hole 213 of the grooved flange 210 toward the annular sealing gasket 220, the sealing grease can be squeezed and pushed by the medium to gather at the joint 221 of the annular sealing groove 212 of the flange sealing device and the annular sealing gasket 220. Then, the sealing grease gathered near the joint 221 will be entrained by the medium near the leakage or puncture point into the leakage or puncture gap, and accumulate in the gap to form a filling blockage, blocking the leakage or puncture, so as to restore the sealing of the flange sealing device.

[0055] Of course, when the flange sealing device encounters leakage or puncture, the bevel flange 210 may not be tightened according to actual needs, but the gap causing leakage or puncture at the joint 221 between the annular sealing groove 212 of the flange sealing device and the annular sealing gasket 220 may be filled directly by injecting grease into the grease inlet 214a to restore the sealing performance of the flange sealing device.

[0056] See also Figure 4 As shown, specifically, the grease injection channel 214 may include a first channel section 2141 and a second channel section 2142; the first end of the first channel section 2141 is connected to the grease inlet 214a, the second end of the first channel section 2141 is connected to the first end of the second channel section 2142, and the second end of the second channel section 2142 is connected to the grease outlet 214b.

[0057] Among them, the first channel section 2141 and the second channel section 2142 can be on the same straight line or have a certain angle between each other; the specific setting method of the first channel section 2141 and the second channel section 2142 can be determined based on comprehensive considerations of actual conditions and is not limited here.

[0058] See also Figure 4 As shown, in order to enable the grease gun or other grease injection equipment to have a larger operating space when connecting to the grease inlet 214a when using a grease gun or other grease injection equipment for grease injection, it is more preferred that the first channel section 2141 can be set to be perpendicular to the bevel surface of the bevel flange 210. At this time, the grease inlet 214a connected to the first end of the first channel section 2141 is located on the bevel surface of the bevel flange 210, and the normal of the grease inlet 214a is perpendicular to the bevel surface of the bevel flange 210.

[0059] In specific implementation, when leakage or puncture occurs in the flange sealing device, the grease gun or other grease injection equipment is moved close to the grease inlet 214a connected to the first end of the first channel section 2141 of the grease injection channel 214 in a direction perpendicular to the bevel of the bevel flange 210, and the sealing grease is injected after it is docked with the grease injection check valve 215 at the grease inlet 214a. In the process of moving the grease gun or other grease injection equipment close to the grease inlet 214a perpendicular to the bevel of the bevel flange 210, there is a certain angle between the grease gun or other grease injection equipment and the pipelines connected at both ends of the flange sealing device, which can reduce the interference of the pipelines with the grease gun or other grease injection equipment. In addition, it can also reduce the interference of the fasteners 230 connecting the two bevel flanges 210 with the grease gun or other grease injection equipment.

[0060] See also Figure 4 As shown, in order to enable the sealing grease to quickly and fully cover the joint 221 of the annular sealing groove 212 and the annular sealing gasket 220 under the squeezing and pushing of the medium in the pipeline after entering the flange sealing device from the grease outlet, it is more preferred that the second channel section 2142 be arranged to be perpendicular to the end face of the second end of the bevel flange 210. At this time, the grease outlet 214b connected to the second end of the second channel section 2142 is located on the end face of the second end of the bevel flange 210 and is close to the annular sealing groove 212. The normal of the grease outlet 214b is perpendicular to the end face of the second end of the bevel flange 210.

[0061] In specific implementation, when the flange sealing device leaks or is punctured, there is no need to shut down the process pipeline to relieve pressure. That is, when the pipeline is under pressure, a grease gun or other grease injection equipment can be directly placed close to the grease inlet 214a, and after it is docked with the grease injection check valve 215 at the grease inlet 214a, the sealing grease can be injected. The sealing grease first enters the grease injection channel 214 through the grease injection check valve 215, and then flows from the grease outlet 214b of the grease injection channel 214 into the end faces of the second ends of the two grooved flanges 210 that are relatively set. Since the medium entering the flange sealing device from the pipe section has a certain pressure, and the pressure diffuses from the inner hole 213 of the grooved flange 210 toward the annular sealing gasket 220, the medium flows from the grease outlet 214b into the end faces of the second ends of the two grooved flanges 210 that are relatively set. The sealing grease in between will be squeezed and pushed by the medium inside the flange sealing device to gather at the joint 221 between the annular sealing groove 212 of the flange sealing device and the annular sealing gasket 220 to fill the gap at the joint 221 that causes leakage or puncture, and the normal of the grease outlet 214b is set perpendicular to the end face of the second end of the bevel flange 210 so that the sealing grease flowing out of the grease outlet 214b can be squeezed and pushed by the medium to the joint 221 of the annular sealing groove 212 of the flange sealing device and the annular sealing gasket 220 without omission and smoothly, and then, the sealing grease gathered near the joint 221 will be carried into the gap of leakage or puncture by the medium near the leakage or puncture, and accumulate in the gap to form a filling blockage, blocking leakage or puncture, so as to restore the sealing of the flange sealing device.

[0062] In order to enable the flange sealing device to repair leakage or puncture gaps at the joint 221 between the annular sealing groove 212 and the annular sealing gasket 220 more accurately and quickly and save sealing grease, at least two grease injection channels 214 can be set on the bevel flange 210. That is to say, in a specific implementation, two grease injection channels 214 can be set on the bevel flange 210, or three grease injection channels 214 can be set on the bevel flange 210, or more grease injection channels 214 can be set on the bevel flange 210 according to actual needs.

[0063] At least two grease injection channels 214 are arranged at intervals on the bevel flange 210, that is, at least two grease injection channels 214 can be arranged at equal intervals on the bevel flange 210, or can be arranged at unequal intervals. The specific arrangement of the grease injection channels 214 can also be determined according to the on-site operating space during specific implementation, and no further restrictions are made here.

[0064] It should be noted that no matter how many grease injection channels 214 are set on the bevel flange 210, and no matter how the at least two grease injection channels 214 are arranged on the bevel flange 210, it is necessary to consider the strength of the bevel flange 210 and the pressure requirements of the specific application scenario of the flange sealing device; that is, after determining the number and arrangement of the grease injection channels 214 set on the bevel flange 210 of the flange sealing device, it is also necessary to check the overall strength of the bevel flange 210 to ensure that the overall strength of the bevel flange 210 and the strength of the wall near the grease injection channels 214 can meet the strength requirements of the scenario in which the flange sealing device is used.

[0065] Taking into account the uncertainty of the position where leakage or puncture occurs at the joint 221 between the annular sealing groove 212 and the annular sealing gasket 220 of the flange sealing device, and at the same time, in order to ensure that when leakage or puncture occurs at any position of the joint 221 between the annular sealing groove 212 and the annular sealing gasket 220, it can be accurately and quickly handled and sealing grease can be saved, at least two grease injection channels 214 can be set and evenly distributed along the circumference of the groove flange 210.

[0066] In specific implementation, when leakage or puncture occurs at any position of the joint 221 between the annular sealing groove 212 and the annular sealing gasket 220 of the flange sealing device, the grease injection channel 214 closest to the leakage or puncture gap can be selected to inject sealing grease so that the sealing grease blocks the leakage or puncture gap and restores the seal. This method of selecting the grease injection channel 214 closest to the leakage or puncture gap for grease injection can not only accurately and quickly deal with leakage or puncture at any position of the joint 221 between the annular sealing groove 212 and the annular sealing gasket 220, but also saves sealing grease.

[0067] Of course, if the gap of leakage or puncture at the joint 221 of the annular sealing groove 212 and the annular sealing gasket 220 of the flange sealing device is relatively large, or there are many leakage or puncture locations, sealing grease can also be injected from two or more grease injection channels 214 at the same time to quickly block the relatively large leakage or puncture gap, or to quickly block multiple leakage or puncture gaps, so as to facilitate the flange sealing device to quickly restore the seal. In specific implementation, when multiple leakages occur, the seal can be restored by first tightening the fastener 230 on the groove flange 210, and if tightening is ineffective, the seal can be restored by injecting sealing grease through the grease injection channel 214.

[0068] In order to enable the sealing grease entering the flange sealing device from the grease outlet 214b to quickly gather in the leakage or puncture gap at the joint 221 between the annular sealing groove 212 and the annular sealing gasket 220, so as to plug the leakage or puncture gap as soon as possible and restore the sealing of the flange sealing device, the grease outlet 214b can be arranged close to the annular sealing groove 212.

[0069] In specific implementation, when a gap with leakage or puncture occurs at the joint 221 between the annular sealing groove 212 and the annular sealing gasket 220 of the flange sealing device, sealing grease is injected into the flange sealing device from the grease injection channel 214. Since the grease outlet 214b is close to the annular sealing groove 212, the sealing grease flowing into the flange sealing device from the grease outlet 214b can quickly reach the joint 221 between the annular sealing groove 212 and the annular sealing gasket 220 under the squeezing and pushing of the medium in the flange sealing device. The sealing grease gathered near the joint 221 will be carried into the gap with leakage or puncture by the medium near the leakage or puncture, and accumulate in the gap to form a filling blockage, thereby blocking the leakage or puncture and restoring the sealing performance of the flange sealing device.

[0070] It should be noted that the distance between the grease outlet 214b and the annular sealing groove 212 can be determined according to the needs of actual application, and no specific restrictions are made here. However, when determining the distance between the grease outlet 214b and the annular sealing groove 212, it is necessary to take into account the strength of the bevel flange 210, the pressure requirement of the application scenario of the flange sealing device, and the strength of the edge of the annular sealing groove 212. That is to say, after determining the distance between the grease outlet 214b and the annular sealing groove 212, it is also necessary to check the overall strength of the bevel flange 210 to ensure that the overall strength of the bevel flange 210 and the strength of the side edge of the annular sealing groove 212 close to the grease injection channel 214 can meet the strength requirements of the scenario in which the flange sealing device is used.

[0071] In addition, the method of setting the grease injection check valve 215 at the grease inlet 214a of the grease injection channel 214 includes but is not limited to the following two possible implementation methods:

[0072] One possible implementation is to connect the grease injection check valve 215 to the hole wall of the grease inlet 214a through a threaded seal, that is, to set an internal thread on the hole wall of the grease inlet 214a, and to set an external thread matching the internal thread on the hole wall of the grease inlet 214a on the outer surface of one end of the grease injection check valve 215 connected to the grease inlet 214a, so as to achieve a threaded seal connection, wherein the threaded seal connection can be selected from tapered threads or flat threads, etc.; generally, under high pressure conditions, a tapered surface seal is selected between the grease injection check valve 215 and the hole wall of the grease inlet 214a, and the sealing effect is better. In addition, this implementation method of connecting the grease injection check valve 215 to the hole wall of the grease inlet 214a through a threaded seal also has the advantage of being easy to disassemble and replace.

[0073] In other embodiments, in order to ensure a more reliable seal at the threaded connection, a sealing material may be applied to the threaded connection surface to further ensure the sealing of the threaded connection between the grease injection check valve 215 and the hole wall of the grease inlet 214a.

[0074] Another possible implementation method is to connect the grease injection check valve 215 and the hole wall of the grease inlet 214a by interference fit. This connection method can ensure good sealing between the grease injection check valve 215 and the hole wall of the grease inlet 214a.

[0075] At present, the outer shape and inner hole 213 of the bevel flange 210 commonly used in the flange sealing device are both circular, and the outer shape of the bevel flange 210 and the inner hole 213 are coaxially arranged. Therefore, in order to ensure that the bevel flange 210, the annular sealing groove 212 and the annular sealing gasket 220 of the flange sealing device can be evenly stressed, the annular sealing groove 212 can be coaxially arranged with the inner hole 213. This arrangement ensures that the flange sealing device is evenly stressed, and also facilitates the uniform arrangement of multiple grease injection channels 214 along the circumferential direction.

[0076] Considering that the flange sealing device realizes sealing by two bevel flanges 210 being arranged opposite to each other and squeezing the annular sealing gasket 220 clamped between the annular sealing grooves 212 of the two bevel flanges 210, in order to enable the annular sealing gasket 220 to deform under the squeezing of the two bevel flanges 210 and seal the joint 221 between the annular sealing groove 212 and the annular sealing gasket 220 to ensure the sealing performance of the flange sealing device, the hardness of the selected annular sealing gasket 220 is generally smaller than the hardness of the bevel flange 210.

[0077] In specific implementation, when the two bevel flanges 210 are relatively arranged and fastened together by the fasteners 230, the relatively arranged annular sealing grooves 212 on the two bevel flanges 210 will squeeze the annular sealing gasket 220 sandwiched therebetween. At this time, since the hardness of the annular sealing gasket 220 is less than the hardness of the bevel flange 210, the annular sealing gasket 220 will gradually deform under the extrusion of the bevel flange 210 and fill the joint 221 between the annular sealing groove 212 and the annular sealing gasket 220, so that the flange sealing device has good sealing performance and a certain pressure-bearing capacity.

[0078] The flange sealing device of the present invention is used on the process pipeline in the oil and gas station, and comprises: an annular sealing gasket 220 and two oppositely arranged groove flanges 210, the annular sealing gasket 220 is sandwiched between the two groove flanges 210; the groove flange 210 has a first end and a second end, the first end is used to connect with the pipeline, the second ends of the two groove flanges 210 are arranged oppositely, and the end surfaces of the second ends of the two groove flanges 210 are provided with annular sealing grooves 212 that can accommodate the annular sealing gasket 220, and the annular sealing grooves 212 are arranged around the inner hole 213 of the groove flange 210; by arranging a grease injection channel 214 on the groove flange 210, the grease injection channel 214 has a grease inlet 214a and a grease outlet 214b, the grease inlet 214a is connected to the outside, and a grease injection check valve 215 is arranged at the grease inlet 214a, so that the sealing grease can be injected from the grease inlet 214a into the internal air of the flange sealing device In the meantime, the medium in the pipeline cannot flow out of the grease inlet 214a due to the obstruction of the grease injection check valve 215. The grease outlet 214b is arranged between the annular sealing groove 212 and the inner hole 213, and is connected with the joint 221 of the annular sealing groove 212 and the annular sealing gasket 220, so that the sealing grease flowing out of the grease outlet 214b can flow to the joint 221 of the annular sealing groove 212 and the annular sealing gasket 220 under the thrust of the medium in the pipeline, and then, the sealing grease gathered near the joint 221 will be carried into the gap of leakage or puncture by the medium near the leakage or puncture point, and accumulate in the gap to form a filling blockage, blocking the leakage or puncture, so as to restore the sealing of the flange sealing device, so that the sealing joint 221 of the flange can be repaired without stopping the production of the process pipeline, and the sealing of the flange sealing device can be restored, thereby ensuring the production efficiency of the process pipeline.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flange sealing device, used on process pipelines in oil and gas stations, characterized in that: include: An annular sealing gasket and two oppositely arranged bevel flanges, wherein the annular sealing gasket is sandwiched between the two bevel flanges; The bevel flange has a first end and a second end, the first end of the bevel flange is used to connect to the pipeline, the second ends of the two bevel flanges are arranged opposite to each other, and an annular sealing groove capable of accommodating the annular sealing gasket is arranged on the end surfaces of the second ends of the two bevel flanges, and the annular sealing groove is arranged around the inner hole of the bevel flange; The groove flange is provided with at least two grease injection channels arranged at equal intervals, and the grease injection channel has a grease inlet and a grease outlet, the grease inlet is connected to the outside, the normal line of the grease inlet is perpendicular to the groove slope of the groove flange, and a grease injection check valve is provided at the grease inlet; the normal line of the grease outlet is perpendicular to the end face of the second end of the groove flange and the grease outlet is provided close to the annular sealing groove, the grease outlet is provided between the annular sealing groove and the inner hole, and is connected to the joint of the annular sealing groove and the annular sealing gasket, so that the sealing grease added with sealing particles flowing out of the grease outlet flows to the joint under the thrust of the medium in the pipeline to seal the joint; the number of the grease injection channels is related to the strength of the groove flange; The distance between the grease outlet and the annular sealing groove is at least related to the strength of the groove flange and the edge strength of the annular sealing groove; Wherein, the grease injection channel comprises a first channel section and a second channel section; The first end of the first channel section is communicated with the grease inlet, the second end of the first channel section is communicated with the first end of the second channel section, and the second end of the second channel section is communicated with the grease outlet; the first channel section is perpendicular to the bevel surface of the bevel flange; the second channel section is perpendicular to the end surface of the second end of the bevel flange; Among them, when a seepage occurs at the junction of the annular sealing groove and the annular sealing gasket, the grease injection channel closest to the seepage is selected from the at least two equally spaced grease injection channels for grease injection; when multiple seepages occur at the junction of the annular sealing groove and the annular sealing gasket, grease is injected into the at least two equally spaced grease injection channels at the same time.

2. The flange sealing device according to claim 1, characterized in that: At least two of the grease injection channels are evenly distributed along the circumference of the groove flange.

3. The flange sealing device according to claim 1 or 2, characterized in that: The grease injection check valve is connected to the hole wall of the grease inlet through a threaded seal.

4. The flange sealing device according to claim 1 or 2, characterized in that: The annular sealing groove is coaxially arranged with the inner hole.

5. The flange sealing device according to claim 1 or 2, characterized in that: The hardness of the annular sealing gasket is less than the hardness of the groove flange.

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