Multi-sealing flange

Abstract

The utility model provides a multi-seal flange, including: the flange shell that is sleeved on the outer surface of connecting mechanism and is located in the periphery of casing pipe, be provided the flexible support backing ring and the seal ring in the flange shell, flexible support backing ring abut between connecting mechanism lower end face and casing pipe upper end face, seal ring is sleeved on the periphery of casing pipe. According to the utility model, the sealing performance of the sleeve after being connected with the connecting mechanism can be greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to oil gas machinery connecting piece technical field, specifically, relate to a multiple sealing flange. BACKGROUND

[0002] Flange is the common structure applied to oil gas production site, it is mainly used for connecting upper structure and lower structure together. In order to adapt to the increasingly diversified oil gas equipment, for the mechanism installed on the casing, it is usually necessary to guarantee that the casing and the mechanism have preferable sealing performance with the casing in the connecting position. Since the upper end face of the casing is usually uneven, after connecting the casing and the mechanism through the flange, the sealing performance is poor, once leakage occurs, it is easy to cause oil gas leakage, causes great economic loss, and also can cause serious well site safety accident. SUMMARY

[0003] One purpose of the utility model is to provide a multiple sealing flange to greatly improve the sealing performance of the casing after being connected with the connecting mechanism.

[0004] According to the utility model, provide a multiple sealing flange, including: the flange shell of being sleeved in the outer surface of connecting mechanism and being located at the casing periphery, the flexible support pad ring and sealing ring of being set in the inside of the flange shell, the flexible support pad ring is abutted between the lower end face of connecting mechanism and the upper end face of casing, and the sealing ring is set on the periphery of casing.

[0005] In one preferred embodiment, the inner wall of the flange shell is provided with two sealing ring grooves, and two sealing rings are arranged in the two sealing ring grooves.

[0006] In one preferred embodiment, the multiple sealing flange further comprises a one-way valve interface, a valve body, a spring arranged inside the one-way valve interface, and a plugging ball arranged in the valve body. The first end of the one-way valve interface is connected with the sealing ring groove through the channel formed in the inside of the flange shell, and the second end is connected with the valve body. The inside of the one-way valve interface communicates with the inside of the valve body, and one end of the spring is connected with the plugging ball.

[0007] In one preferred embodiment, the valve body is connected with a one-way valve outer cover at the end away from the one-way valve interface.

[0008] In a preferred embodiment, the multiple sealing flange further comprises: a one-way valve interface, a valve body, a spring arranged inside the one-way valve interface, and a blocking ball arranged inside the valve body, a receiving space is arranged between the inner wall of the flange shell and the sleeve at the lower part of the sealing ring groove, a first end of the one-way valve interface is communicated with the receiving space through a channel arranged inside the flange shell, and a second end is connected with the valve body, the inside of the one-way valve interface is communicated with the inside of the valve body, one end of the spring is connected with the blocking ball, and the valve body is connected with a one-way valve outer cover at an end away from the one-way valve interface.

[0009] In a preferred embodiment, the flange shell comprises: an upper connecting piece, a lower connecting piece, and a columnar part arranged between and connecting the upper connecting piece and the lower connecting piece.

[0010] In a preferred embodiment, the upper surface of the upper connecting piece is provided with an upper steel ring groove extending in a circumferential direction, and the lower surface of the lower connecting piece is provided with a lower steel ring groove extending in a circumferential direction.

[0011] In a preferred embodiment, the upper surface of the upper connecting piece is provided with a boss, and the upper steel ring groove is arranged on the surface of the boss.

[0012] In a preferred embodiment, the outer side surface of the columnar part is provided with a plurality of observation openings, and a plurality of grease injection openings are arranged on the side opposite to the observation openings.

[0013] In a preferred embodiment, the outer side surface of the columnar part is further provided with two pressure test openings.

[0014] The utility model has at least the following technical effects:

[0015] According to the application, the flange shell is sleeved on the outer surface of the connecting mechanism and located at the outer periphery of the sleeve, the flexible supporting pad ring is arranged inside the flange shell, and the sealing ring is arranged. The flexible supporting pad ring is abutted between the lower end surface of the connecting mechanism and the upper end surface of the sleeve, so that the unevenness of the upper end surface of the sleeve is compensated by the supporting pad ring with a softer material, and the auxiliary sealing between the connecting mechanism and the sleeve is realized. In addition, the sealing ring is sleeved on the outer periphery of the sleeve, so that the sleeve is further sealed, and the sealing performance of the sleeve after being connected with the connecting mechanism is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The structure schematic diagram of the multiple sealing flange and the connecting mechanism after assembly according to one embodiment of the utility model is schematically shown;

[0017] Figure 2 The structure schematic diagram of the multiple sealing flange and the connecting mechanism after assembly according to one embodiment of the utility model is schematically shown; Figure 1An enlarged overall structure schematic view at middle A;

[0018] Figure 3 An overall structure schematic view of a flange shell according to one embodiment of the present application is schematically shown;

[0019] Figure 4 An assembled top view structure schematic view of a multiple sealing flange connection mechanism according to one embodiment of the present application is schematically shown.

[0020] In the present application, all the drawings are schematic drawings, which are only used for explaining the principles of the present application, and are not drawn according to the actual proportion. DETAILED DESCRIPTION

[0021] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] In the description of the present application, it should be understood that the terms "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, which are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0023] In the present application, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned term in the present application can be understood according to the specific circumstances.

[0024] As Figures 1 to 3The utility model discloses a multiple sealing flange 100 for connecting the connecting mechanism 1 with the sleeve 5, which comprises a flange shell 4 sleeved on the outer surface of the connecting mechanism 1 and located at the outer periphery of the sleeve 5, a flexible support gasket ring 2 arranged inside the flange shell 4 and abutting between the lower end surface of the connecting mechanism 1 and the upper end surface of the sleeve 5, and a sealing ring 3 arranged inside the flange shell 4 and sleeved on the outer periphery of the sleeve 5. The flexible support gasket ring 2 is clamped in the space formed by the lower end surface of the connecting mechanism 1, the flange shell 4 and the upper end surface of the sleeve 5 through interference fit. Optionally, the sealing ring 3 is a BT sealing ring. The flange shell 4 comprises an upper connecting piece 41, a lower connecting piece 43 and a cylindrical part 42 arranged between the upper connecting piece 41 and the lower connecting piece 43 and connecting the two. The upper connecting piece 41 and the lower connecting piece 43 are both cylindrical. Optionally, the connecting mechanism 1 is connected with the flange shell 4 through threads. The connecting mechanism 1 can be a limiting sleeve.

[0025] According to the utility model, the flange shell 4 is sleeved on the outer surface of the connecting mechanism 1 and located at the outer periphery of the sleeve 5, the flexible support gasket ring 2 is arranged inside the flange shell 4, and the sealing ring 3 is arranged inside the flange shell 4. Since the flexible support gasket ring 2 abuts between the lower end surface of the connecting mechanism 1 and the upper end surface of the sleeve 5, the unevenness of the upper end surface of the sleeve 5 can be compensated by the support gasket ring with a softer material, so as to realize the auxiliary sealing between the connecting mechanism 1 and the sleeve 5. Since the sealing ring 3 is sleeved on the outer periphery of the sleeve 5, the sleeve 5 is further sealed, and the sealing performance of the sleeve 5 after being connected with the connecting mechanism 1 is greatly improved.

[0026] In one or more embodiments, two sealing ring grooves 31 are formed in the inner wall of the flange shell 4, and two sealing rings 3 are arranged in the two sealing ring grooves 31. Each sealing ring 3 can withstand a pressure of 35 MPa, further improving the sealing pressure resistance of the flange shell 4.

[0027] In one or more embodiments, the multiple sealing flange 100 further comprises a one-way valve interface 6 which is configured as an open-ended hollow structure. The first end of the one-way valve interface 6 is connected with the sealing ring groove 31 through the channel formed in the inside of the flange shell 4, and the second end thereof is connected with a valve body 9 which is also configured as an open-ended hollow structure through threads. The inside of the one-way valve interface 6 communicates with the inside of the valve body 9. A spring 8 is arranged in the inside of the one-way valve interface 6, and one end of the spring 8 is connected with a blocking ball 7 arranged in the valve body 9. Optionally, the one-way valve interface 6 is connected with the channel formed in the inside of the flange shell 4 through threads.

[0028] In one or more embodiments, the valve body 9 is connected to the one-way valve outer cover 10 through threads at one end away from the one-way valve interface 6, and the one-way valve outer cover 10 is used to seal the internal space of the valve body 9. The spring 8 can press the sealing ball 7 in the internal space of the valve body 9 by applying elastic force, so that the fluid in the well cannot flow outwards. When it is necessary to inject liquid into the internal space of the flange shell 4 from the outside, the one-way valve outer cover 10 is opened, and the hydraulic pipeline is connected to the valve body 9. The injected fluid can compress the spring 8 and flow into the internal space of the flange shell 4 from the gap between the sealing ball 7 and the valve body 9.

[0029] In one or more embodiments, the sleeve 5 at the lower part of the sealing ring groove 31 has a receiving space between the inner wall of the flange shell 4, the first end of the one-way valve interface 6 is communicated with the receiving space through the channel in the internal space of the flange shell 4, and the second end is connected to the valve body 9 which is configured as an open-ended hollow structure. The internal space of the one-way valve interface 6 is communicated with the internal space of the valve body 9, the spring 8 is arranged in the internal space of the one-way valve interface 6, and one end of the spring 8 is connected to the sealing ball 7 which is arranged in the valve body 9. The other end of the valve body 9 is connected to the one-way valve outer cover 10 through threads. In extreme cases, by injecting special sealing grease into the internal space of the valve body 9, the sealing grease can enter the receiving space and fill the outer wall of the sleeve 5 after solidification to form a dense protective layer, which can further improve the sealing ability and prolong the sealing pressure time.

[0030] In one or more embodiments, the upper surface of the upper connecting part 41 of the flange shell 4 is provided with an upper steel ring groove 401 extending in a circumferential direction, and the lower surface of the lower connecting part 43 of the flange shell 4 is provided with a lower steel ring groove 402 extending in a circumferential direction. Steel rings are arranged in the internal spaces of the upper steel ring groove 401 and the lower steel ring groove 402, respectively, for sealing with the connecting parts.

[0031] In one or more embodiments, the upper surface of the upper connecting part 41 has a boss 403, and the upper steel ring groove 401 is arranged on the surface of the boss 403. The boss 403 can make the steel ring groove 401 contact the other connecting parts first, so as to ensure that the steel ring is compressed first and the sealing reliability is ensured.

[0032] As shown in FIG. 1, Figure 3 In one or more embodiments, the flange shell 4 is provided with a plurality of observation openings 406 on the outer side surface of the columnar part 42, and a plurality of grease injection openings 408 are arranged on the side opposite to the observation openings 406.

[0033] In one or more embodiments, the flange shell 4 is further provided with two pressure test openings 407 on the outer side surface of the columnar part 42.

[0034] As shown in FIG. 1, Figure 3 , Figure 4As shown, in one or more embodiments, the upper connector 41 of the flange housing 4 is provided with a plurality of upper holes 404 arranged uniformly in a circumferential manner on the outer side of the boss 403, and the lower connector 43 is provided with a plurality of lower holes 405 arranged uniformly in a circumferential manner, the upper holes 404 and the lower holes 405 being used for connection with other connecting components through threaded members. Optionally, the upper holes 404 and the lower holes 405 are staggered with the observation port 406, the pressure testing port 407, and the grease injection port 408, so as to facilitate on-site worker operation.

[0035] The operation steps of the multiple sealing flange are briefly described as follows. The device is first placed on and off the casing 5, and the limiting installation is completed after the casing 5 presses against the flexible support pad ring 2, the flexible support pad ring 2 can compensate for the unevenness of the upper end surface of the casing 5, and at the same time, auxiliary sealing of the upper end surface of the casing 5 is realized; then the upper holes 404 and the lower holes 405 of the flange housing 4 are connected with other wellhead devices to realize the fixation of the device. Subsequently, the one-way valve outer cover 10 is opened, the hydraulic pipeline is connected to the valve body 9 through threaded connection, and special fluorine oil is injected to activate the two sealing rings 3, so as to realize the second sealing of the outer wall of the casing 5. In an extreme case, the one-way valve outer cover 10 located at the lowermost part of the flange housing 4 can be opened, and the hydraulic pipeline is connected to the corresponding valve body 9 through threaded connection, and special sealing grease is injected into the valve body 9, the sealing grease fills the entire outer wall of the casing 5 after solidification, so as to form a dense protective layer and realize the third sealing of the outer wall of the casing 5.

[0036] Although the utility model has been described with reference to the preferred embodiments, various improvements can be made and equivalent parts can be replaced without departing from the scope of the utility model. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A multiple seal flange characterized by, The flange shell is sleeved on the outer surface of the connecting mechanism and located at the outer periphery of the sleeve, the flexible support pad ring is arranged in the interior of the flange shell and abuts between the lower end surface of the connecting mechanism and the upper end surface of the sleeve, and the sealing ring is sleeved on the outer periphery of the sleeve. Two sealing ring grooves are formed in the inner wall of the flange shell, and the two sealing rings are arranged in the two sealing ring grooves.

2. The multiple seal flange of claim 1, wherein, Further comprising:

3. The multiple seal flange of claim 2, wherein, The one-way valve interface is connected with the sealing ring groove through the channel formed in the interior of the flange shell, the second end is connected with the valve body, the interior of the one-way valve interface is communicated with the interior of the valve body, and one end of the spring is connected with the blocking ball. The valve body is connected with the one-way valve outer cover at the end away from the one-way valve interface.

4. The multiple seal flange of claim 3, wherein, Further comprising:

5. The multiple seal flange of claim 2, wherein, The one-way valve interface is connected with the sealing ring groove through the channel formed in the interior of the flange shell, the second end is connected with the valve body, the interior of the one-way valve interface is communicated with the interior of the valve body, and one end of the spring is connected with the blocking ball. The flange shell comprises an upper connecting piece, a lower connecting piece and a cylindrical part arranged between the upper connecting piece and the lower connecting piece and connecting the two.

6. The multiple seal flange of claim 1, wherein, The upper surface of the upper connecting piece is provided with an upper steel ring groove extending in a circumferential form, and the lower surface of the lower connecting piece is provided with a lower steel ring groove extending in a circumferential form.

7. The multiple seal flange of claim 6, wherein, The upper surface of the upper connecting piece has a boss, and the upper steel ring groove is arranged on the surface of the boss.

8. The multiple seal flange of claim 7, wherein, The outer side surface of the cylindrical part is provided with a plurality of observation ports, and a plurality of grease injection ports are arranged on the side opposite to the observation ports.

9. The multiple seal flange of claim 6, wherein, The outer side surface of the cylindrical part is further provided with two pressure test ports.

10. The multiple seal flange of claim 9, wherein, ​

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