CN212055849U - Air trap valve - Google Patents

Abstract

The application discloses cover gas valve belongs to oil gas exploitation technical field. This set of gas valve includes: the sleeve nozzle sleeve, the valve plug, the pressure regulating structure, the limiting structure and the sealing structure; a stepped hole is arranged in the valve plug, the end with the smaller aperture on the valve plug is fixedly connected with the inner wall of the first end of the nozzle sleeve, and the outer wall of the end with the larger aperture on the valve plug is provided with a limit groove; the limiting structure is hermetically connected with the side wall of the nozzle sleeve, and one end of the limiting structure is clamped in the limiting groove; the first end of the pressure regulating structure can block the stepped hole, and can move under the action of external force to conduct the two chambers; the first end of the sleeve nozzle sleeve is connected with the sleeve, the second end of the sleeve nozzle sleeve is connected with the sealing structure, and the third end of the sleeve nozzle sleeve is connected with the oil pipe; the valve plug can be prevented from falling off through the limiting effect of the limiting structure on the valve plug; the first end of the pressure regulating structure can conduct the two cavities under the action of external force, so that the release of gas in the sleeve to the oil pipe can be realized.

Description

air valve

technical field

The present application relates to the technical field of oil and gas exploitation, and in particular, to a casing valve.

Background technique

In the process of oil and gas exploitation, a large amount of gas is easily generated in the casing, which causes the pressure in the casing to increase greatly, thus affecting the normal operation of the deep well pump. For smooth oil production, the gas in the casing can be released into the tubing to reduce the pressure in the casing. In practical engineering, a casing gas valve is usually installed on the Christmas tree at the oil wellhead. The casing gas valve is set at the connection between the oil pipe and the casing, which can release the gas in the casing into the oil pipe.

In the related art, a gas sleeve valve includes a nozzle sleeve, a valve plug, a pressure regulating structure and a solid plug. The nozzle sleeve is a T-shaped tubular structure. The solid plug can be detachably connected to the sealing end of the nozzle sleeve. The inlet end of the nozzle sleeve is used to communicate with the casing, and the exhaust end of the nozzle sleeve is used to communicate with the oil pipe. The valve plug is threadedly connected with the inner wall of the nozzle sleeve, and the valve plug is provided with a through hole. The pressure regulating structure is threadedly connected with the valve plug. The pressure regulating structure is used to block the through hole and can open the through hole under the action of external force. , to connect casing and tubing.

However, when the gas in the casing is released into the oil pipe through the above-mentioned device, the pushing action of the gas on the valve plug makes the connection between the valve plug and the nozzle sleeve easy to loosen, and then falls off, thus affecting the normal development of the oil and gas well. .

Utility model content

The present application provides a gas sleeve valve, which can solve the problem that the valve plug is easy to fall off. The technical solution is as follows:

A sleeve air valve, the sleeve air valve comprises: a nozzle sleeve, a valve plug, a pressure regulating structure, a limit structure and a sealing structure;

The valve plug is provided with a stepped hole in the axial direction, the valve plug is arranged in the inner cavity of the nozzle sleeve, and the end of the valve plug with a smaller hole diameter is connected to the inner wall of the first end of the nozzle sleeve. fixedly connected to separate the mouthpiece into two chambers, and the outer wall of the end of the valve plug with the larger aperture is provided with a limiting groove;

One end of the limiting structure passes through the side wall of the mouthpiece sleeve, and is sealedly connected with the sidewall of the mouthpiece cover, and one end of the limiting structure is clamped in the limiting groove;

The pressure regulating structure is connected to the inner wall of one end of the valve plug with a large hole diameter, the first end of the pressure regulating structure can block the stepped hole, and the first end of the pressure regulating structure can be under the action of external force moving to conduct the two chambers;

The first end of the mouthpiece is used to connect with the sleeve, the second end of the mouthpiece opposite to the first end is detachably connected to the sealing structure, and the first end of the mouthpiece is detachably connected to the sealing structure. The three ends are used to connect with the oil pipe.

In a possible implementation manner, the limiting structure includes a top wire and a limiting post;

The side wall of the mouthpiece is provided with a threaded through hole, the top wire is fixedly connected with the threaded through hole, and one end of the top wire is fixedly connected with the first end of the limit post, the limit The second end of the column is clamped in the limiting groove.

Optionally, a pressure relief hole is provided on the side wall of the mouthpiece that is connected to the top wire, and the pressure relief hole can communicate with the first chamber when the top wire is unscrewed, and the first chamber is connected to the first chamber. A chamber refers to a chamber among the two chambers for communicating with the oil pipe.

Optionally, the pressure regulating structure includes: a valve stem, an elastic member, and a pressure regulating ball;

The side wall of the first end of the valve rod is provided with an exhaust groove communicating with a first chamber, and the first chamber refers to a chamber used to communicate with the oil pipe among the two chambers , the side wall of the first end of the valve stem is threadedly connected to the inner wall of the end with a larger aperture on the valve plug;

The first end of the valve stem is connected with the first end of the elastic member, and the second end of the elastic member abuts on the pressure regulating ball, and the pressure regulating ball is used to block the stepped hole , the pressure regulating ball can move under the action of external force to conduct the second chamber and the exhaust groove, the second chamber refers to the two chambers used to communicate with the sleeve of a chamber.

Optionally, the second end of the valve stem is in a hexagonal prismatic structure.

Optionally, the sealing structure is provided with a central through hole, and the second end of the pressure regulating structure passes through the central through hole and is sealedly connected to the sealing structure.

Optionally, the sealing structure includes a plug, a sealing packing and a gland;

The plug, the sealing packing and the gland are sequentially sleeved on the pressure regulating structure, and the plug is fixedly connected with the second end of the mouth sleeve, and the gland is connected to the pressure regulating structure. The plug is fixedly connected, and the sealing packing is used to seal the gap between the pressure regulating structure and the plug.

Optionally, the pressure regulating structure is provided with a resisting and retreating boss, and the resisting and retreating boss is located in a first chamber, and the first chamber refers to the two chambers near the mouthpiece. a chamber at the second end.

Optionally, the maximum distance between the resisting boss and the sealing structure is less than a distance threshold, where the distance threshold refers to a minimum distance preventing the first end of the pressure regulating structure from being separated from the valve plug.

Optionally, the air sleeve valve further includes a sealing ring, the inner wall of the second end of the nozzle sleeve is provided with a stepped platform, the sealing ring is seated on the stepped surface of the stepped platform, and the sealing structure abuts against After the sealing structure is fixedly connected to the second end of the mouthpiece on the sealing ring and is sealed with the second end of the mouthpiece, the sealing ring can be pressed against the step end face of the table.

The beneficial effects of the technical solutions provided by this application may at least include:

The outer wall of the upper end of the valve plug with the larger hole diameter is provided with a limit groove, the limit structure is sealedly connected with the side wall of the nozzle sleeve, and one end of the limit structure can be stuck in the limit groove, so that the limit structure can pass through The limit groove limits the valve plug to prevent the valve plug from falling off. In addition, the first end of the nipple sleeve is connected to the casing, and the third end of the nipple sleeve is connected to the oil pipe. The first end of the pressure regulating structure can be moved by the action of external force, and then the two chambers are connected to realize The release of gas in the casing to the tubing.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a gas sleeve valve provided in an embodiment of the present application;

2 is a schematic structural diagram of another gas sleeve valve provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another gas sleeve valve provided by an embodiment of the present application.

Reference number:

1: Mouth sleeve; 2: Valve plug; 3: Pressure regulating structure; 4: Limiting structure; 5: Sealing structure;

11: pressure relief hole; 41: top wire; 42: limit post; 31: valve stem; 32: elastic part; 33: pressure regulating ball; 34: blocking boss; 51: plug; 52: sealing packing ; 53: gland.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

FIG. 1 illustrates a schematic structural diagram of a gas sleeve valve according to an embodiment of the present application. As shown in FIG. 1 , the air sleeve valve includes: a nozzle sleeve 1 , a valve plug 2 , a pressure regulating structure 3 , a limiting structure 4 and a sealing structure 5 . The valve plug 2 is provided with a stepped hole in the axial direction, the valve plug 2 is arranged in the inner cavity of the nozzle sleeve 1, and the end of the valve plug 2 with a smaller hole diameter is fixedly connected with the inner wall of the first end of the nozzle sleeve 1 to connect the nozzle sleeve 1. The mouth cover 1 is divided into two chambers, and the outer wall of the end of the valve plug 2 with the larger aperture is provided with a limiting groove. One end of the limiting structure 4 passes through the side wall of the mouthpiece sleeve 1 and is sealedly connected with the sidewall of the mouthpiece cover 1 , and one end of the limiting structure 4 is clamped in the limiting groove. The pressure regulating structure 3 is connected to the inner wall of one end of the valve plug 2 with a large aperture, the first end of the pressure regulating structure 3 can block the stepped hole, and the first end of the pressure regulating structure 3 can move under the action of external force to conduct the two. chambers. The first end of the mouthpiece cover 1 is used to connect with the sleeve, the second end of the mouthpiece cover 1 opposite to the first end is detachably connected with the sealing structure 5, and the third end of the mouthpiece cover 1 is used for detachable sealing connection. Connect with the oil pipe.

In the embodiment of the present application, the outer wall of the end of the valve plug 2 with the larger upper aperture is provided with a limiting groove, the limiting structure 4 is sealedly connected with the side wall of the nozzle sleeve 1, and one end of the limiting structure 4 can be stuck in the limiting position In this way, the limiting structure 4 can limit the valve plug 2 through the limiting groove, thereby preventing the valve plug 2 from falling off. In addition, the first end of the nipple sleeve 1 is connected with the casing, and the third end of the nipple sleeve 1 is connected with the oil pipe, which can promote the movement of the first end of the pressure regulating structure 3 through the action of external force, thereby conducting the two chambers. , in order to realize the release of the gas in the casing to the tubing.

The shape of the mouthpiece sleeve 1 may be a hollow T-shaped structure, so that the third end of the mouthpiece cover 1 may be provided with a communication pipe for fixed connection with the oil pipe. Of course, the nozzle sleeve 1 may also be a hollow cylindrical structure, and in this case, a through hole may be provided on the side wall of the nozzle sleeve 1 so as to communicate with the oil pipe through the through hole.

Wherein, the limiting groove may be a ring-shaped groove, of course, may also be a section of groove, as long as it is convenient for one end of the limiting structure 4 to be clipped into the groove, which is not limited in the embodiments of the present application. In addition, the width of the groove may be slightly larger than the size of one end of the limiting structure 4 in the direction of the central axis of the valve plug 2, so that one end of the limiting structure 4 can be clamped in the groove.

In some embodiments, the outer wall of the valve plug 2 and the inner wall of the nozzle sleeve 1 can both be cylindrical structures, the outer wall of the end with the smaller hole diameter on the valve plug 2 is provided with an external thread, and the first end of the nozzle sleeve 1 has an external thread. The inner wall can be provided with internal threads, so that the valve plug 2 can be connected with the nipple sleeve 1 in a threaded connection.

In other embodiments, the inner wall of the nipple cover 1 may be a stepped structure, and the inner wall of the end with the smaller inner diameter of the nipple cover 1 may be provided with internal threads. Correspondingly, the outer wall of the end with the smaller hole diameter on the valve plug 2 An external thread may be provided, and then the valve plug 2 may be threadedly connected with the mouthpiece sleeve 1 . In this way, an annular space can be formed between the inner wall of the part with the larger inner diameter of the mouthpiece sleeve 1 and the outer wall of the end of the valve plug 2 with the larger hole diameter.

In still other embodiments, as shown in FIG. 2 , the outer wall of the valve plug 2 may be a stepped structure, and the outer diameter of the end of the valve plug 2 with a smaller hole diameter is larger. At this time, the outer wall of the larger outer diameter end of the valve plug 2 can be provided with external threads, and correspondingly, the inner wall of the nozzle sleeve 1 can be provided with internal threads, and the valve plug 2 can be threadedly connected to the nozzle sleeve 1 . In this way, an annular space can be formed between the outer wall of the end of the valve plug 2 with the smaller outer diameter and the inner wall of the mouthpiece sleeve 1 . At this time, the groove can be arranged on the end of the valve plug 2 with the smaller outer diameter.

In some embodiments, the pressure regulating structure 3 may include: a valve stem 31, an elastic member 32, and a pressure regulating ball 33; the side wall of the first end of the valve stem 31 is provided with an exhaust groove communicating with the first chamber, the valve The side wall of the first end of the rod 31 is threadedly connected to the inner wall of the end with a larger aperture on the valve plug 2; the first end of the valve rod 31 is connected to the first end of the elastic piece 32, and the second end of the elastic piece 32 abuts On the pressure regulating ball 33, the pressure regulating ball 33 is used to block the stepped hole, and the pressure regulating ball 33 can move under the action of an external force to conduct the second chamber and the exhaust groove.

The first chamber refers to one of the two chambers for communicating with the tubing, and the second chamber refers to one of the two chambers for communicating with the casing.

In the actual implementation process, the casing can be fixedly connected to the first end of the nozzle sleeve 1, and the oil pipe can be fixedly connected to the third end of the nozzle sleeve 1. When the gas pressure in the casing is greater than the gas pressure in the oil pipe, the gas Under the action of the pressure difference, a force is applied to the pressure regulating ball 33 to squeeze the elastic member 32 to shorten. At this time, the pressure regulating ball 33 can move towards the direction close to the elastic member 32 to conduct the second chamber and the exhaust groove, The first chamber and the second chamber are further communicated, and then the gas in the casing can pass through the second chamber and the first chamber in sequence, and then enter the oil pipe.

Wherein, the length direction of the exhaust groove can be parallel to the central axis direction of the valve stem 31, of course, it can also form a certain angle with the central axis direction of the valve stem 31, as long as the pressure regulating ball 33 can conduct the second chamber and the exhaust gas After the air groove, the exhaust groove may communicate with the first chamber and the second chamber, which is not limited in the embodiment of the present application.

The inner wall of the valve plug 2 with the larger hole diameter is provided with internal threads, and the side wall of the first end of the valve stem 31 is provided with external threads, and the valve stem 31 can be threadedly connected with the valve plug 2 . In this way, by rotating the valve stem 31, the valve stem 31 can move along the direction of the central axis of the valve plug 2, and then the pressing force of the elastic member 32 can be adjusted.

When the pressing force of the valve stem 31 on the elastic member 32 is relatively large, a relatively large external force is required to push the pressure regulating ball 33 so that the elastic member 32 can be squeezed and shortened. The pressure regulating ball 33 can be pushed to release the gas only when the difference between the gas pressures is relatively large, so the release frequency of the gas in the casing is low. When the pressing force of the valve stem 31 on the elastic member 32 is small, a small external force is required to push the pressure regulating ball 33, so that the elastic member 32 can be squeezed and shortened, that is, the gas pressure in the casing is the same as the pressure in the oil pipe. When the difference between the gas pressures is small, the pressure regulating ball 33 can be pushed to release the gas, so the release frequency of the gas in the casing is high.

Wherein, the first end of the valve rod 31 may be provided with a connecting column, so that the elastic member 32 can be sleeved on the connecting column. Of course, the elastic member 32 may also be connected to the first end of the valve stem 31 in other ways, which is not limited in the embodiment of the present application. For example, the elastic member 32 may be adhered to the first end of the valve stem 31 by adhesive. The elastic member 32 may be a spring. Of course, the elastic member 32 may also be other types of elastic members 32, which are not limited in this embodiment of the present application.

Wherein, the diameter of the pressure regulating ball 33 may be larger than the minimum diameter of the stepped hole, and smaller than the diameter of a part of the stepped hole in contact with the pressure regulating ball 33 . In this way, when the elastic member 32 presses the pressure regulating ball 33 toward the end of the valve plug 2 with a smaller hole diameter, the pressure regulating ball 33 can block the stepped hole of the valve plug 2. In addition, when the pressure regulating ball 33 is far away from the valve plug When the upper end with the smaller hole diameter, the pressure regulating ball 33 can conduct the first chamber and the second chamber through the exhaust groove.

In some embodiments, the second end of the valve stem 31 may be in a hexagonal prism-like structure, so that the valve stem 31 can be easily clamped on the valve stem 31 with a wrench to adjust the valve stem 31 . Of course, the second end of the valve stem 31 may also be configured in other shapes, which are not limited in the embodiment of the present application.

In some embodiments, the pressure regulating structure 3 may be provided with a backstop boss 34 , and the backstop boss 34 may be located in the first chamber.

Wherein, the blocking boss 34 may be an annular boss disposed on the outer wall of the pressure regulating structure 3 , and of course may also be bosses of other shapes, which are not limited in the embodiment of the present application. In this way, when the pressure regulating structure 3 moves toward the second end of the nozzle sleeve 1 until the resisting boss 34 contacts the sealing structure 5, the resisting boss 34 can block the continuous movement of the pressure regulating structure 3, thus preventing the The pressure regulating structure 3 is displaced too much.

Wherein, the resisting boss 34 can be integrally formed with the pressure regulating structure 3 , which can ensure that the resisting boss 34 can have sufficient strength and stability. Of course, the resisting boss 34 can also be fixedly connected to the pressure regulating structure 3 in other ways, as long as the resisting boss 34 can have sufficient strength and stability, which is not limited in the embodiment of the present application.

It should be noted that, when the pressure regulating structure 3 includes the valve stem 31 , the blocking boss 34 may be disposed on the outer wall of the valve stem 31 .

In some embodiments, the maximum distance between the blocking boss 34 and the sealing structure 5 may be smaller than the distance threshold, which refers to the minimum distance to prevent the first end of the pressure regulating structure 3 from being separated from the valve plug 2 .

The distance threshold may be the length along the central axis of the portion of the pressure regulating structure 3 in contact with the valve plug 2 when the first end of the pressure regulating structure 3 is pressed against the stepped hole. In this way, when the pressure regulating structure 3 moves to the second end of the nozzle sleeve 1, since the distance between the resisting boss 34 and the sealing structure 5 is smaller than the direction along the central axis of the part of the pressure regulating structure 3 in contact with the valve plug 2 Therefore, the maximum distance that the pressure regulating structure 3 moves toward the second end of the nozzle sleeve 1 does not exceed the length along the central axis of the part of the pressure regulating structure 3 in contact with the valve plug 2. Therefore, the pressure regulating structure 3 does not move. will separate from the valve plug 2.

It should be noted that when the pressure regulating structure 3 includes a valve stem 31 and the valve stem 31 is threadedly connected to the valve plug 2 , the distance threshold may be the thread length of the internal thread on the valve plug 2 .

In some embodiments, as shown in FIG. 3 , the sealing structure 5 may be provided with a central through hole, and the second end of the pressure regulating structure 3 passes through the central through hole and is sealedly connected to the sealing structure 5 . In this way, the second end of the pressure regulating structure 3 can protrude out of the sealing structure 5 and be exposed to the outside air. After that, the second end of the pressure regulating structure 3 can be adjusted directly outside the casing valve to realize the matching of the casing. Control of the frequency of gas release in the tube.

It should be noted that, in the actual project, the pressure regulating structure 3 can be adjusted at any time to control the release frequency of the gas in the casing, and there is no need to disassemble any parts and adjust the casing gate. A lot of convenience has come.

It should be noted that, when the pressure regulating structure 3 includes a valve stem 31 , the valve stem 31 can pass through the central through hole and be sealedly connected with the sealing structure 5 . In this way, the valve stem 31 can be directly adjusted outside the casing valve, and further, the displacement of the valve stem 31 can be adjusted at any time to control the release frequency of the gas in the casing, so that the gas in the casing can be adjusted at any time according to the actual situation. The release frequency can be flexibly adjusted, which can improve the oil production efficiency and ensure the safety of oil production.

In some embodiments, the sealing structure 5 includes a plug 51, a sealing packing 52 and a gland 53; the plug 51, the sealing packing 52 and the gland 53 are sequentially sleeved on the pressure regulating structure 3, and the plug 51 and the sleeve The second end of the mouthpiece 1 is fixedly connected, the gland 53 is fixedly connected with the plug 51 , and the sealing packing 52 is used to seal the gap between the pressure regulating structure 3 and the plug 51 .

Wherein, the plug 51 and the second end of the nozzle sleeve 1, and the fixed connection manner of the gland 53 and the plug 51 may all be threaded connections.

Wherein, the plug 51 may be a stepped cylindrical plug 51, and the plug 51 may be provided with a stepped through hole. The end of the plug 51 with the smaller outer diameter and the end with the smaller inner diameter of the stepped through hole are both facing the second end of the nozzle sleeve 1. Correspondingly, the end of the plug 51 with the larger outer diameter and the inner diameter of the stepped through hole are larger One end of each is facing away from the second end of the mouthpiece cover 1 . The end of the plug 51 with the smaller outer diameter is provided with an external thread, and correspondingly, the second end of the nipple sleeve 1 is provided with an internal thread, so that the plug 51 can be threadedly connected with the second end of the nipple sleeve 1 . The larger end of the stepped through hole on the plug 51 is provided with an internal thread. Correspondingly, the end of the gland 53 facing the plug 51 is provided with an external thread, so that the gland 53 can be threadedly connected to the plug 51 .

Wherein, there are gaps between the plug 51 and the pressure regulating structure 3, and between the pressure cover 53 and the pressure regulating structure 3, and the sealing packing 52 can be pressed between the two end faces where the plug 51 and the pressure cover 53 are connected, And the sealing packing 52 is in close contact with the pressure regulating structure 3, so that the sealing packing 52 can effectively seal the gap between the pressure regulating structure 3 and the plug 51, and the gas in the first chamber will not flow from the plug 51. It leaks from the gap with the pressure regulating structure 3 .

Wherein, the material of the sealing packing 52 can be a material with elasticity and airtightness. In this way, on the basis of the sealing property of the sealing packing 52 itself, after the sealing packing 52 is elastically compressed, the plug 51 and the gland can be ensured. 53 , and close contact between the sealing packing 52 and the pressure regulating structure 3 , so that the sealing performance of the sealing packing 52 can be further improved. Further, the material of the sealing packing 52 can also be a material with a certain lubricating function, so that when the pressure regulating structure 3 is adjusted, the frictional force between the pressure regulating structure 3 and the sealing packing 52 can be reduced, and the The smooth adjustment of the pressure regulating structure 3. For example, the material of the sealing packing 52 may be asbestos impregnated with butter, and of course other materials, which are not limited in this embodiment of the present application.

In some embodiments, the air sleeve valve may further include a sealing ring, the inner wall of the second end of the nozzle sleeve 1 is provided with a stepped platform, the sealing ring is located on the stepped surface of the stepped platform, and the sealing structure 5 abuts on the sealing ring, And it is sealingly connected with the second end of the mouthpiece cover 1 .

In this way, the sealing structure 5 can press the sealing ring against the end face of the step table, and then the sealing ring can seal the gap between the sealing structure 5 and the nozzle sleeve 1 , thereby preventing the gas in the first chamber from passing from the sealing structure 5 to the mouthpiece 1 . Leakage from the gap of the muzzle 1.

In some embodiments, a sealing packing may be provided at the joint between the nozzle sleeve 1 and the sealing structure 5, so that the sealing packing can seal the gap between the sealing structure 5 and the nozzle sleeve 1, thereby preventing the gas in the chamber It leaks from the gap between the sealing structure 5 and the mouthpiece cover 1 .

In some embodiments, the limiting structure 4 may include a top wire 41 and a limiting post 42; the side wall of the nozzle sleeve 1 is provided with a threaded through hole, the top wire 41 is fixedly connected with the threaded through hole, and one end of the top wire 41 is connected to the threaded through hole. The first end of the limiting column 42 is fixedly connected, and the second end of the limiting column 42 is clamped in the limiting groove.

The side wall of the nozzle sleeve 1 can be provided with a hollow cylindrical branch pipe whose center axis is perpendicular to the center axis of the valve plug 2. The branch pipe is communicated with the chamber of the nozzle sleeve 1, and the branch pipe is provided with internal threads, and the top thread 41 can be threaded with the branch pipe.

Among them, the top wire 41 can be integrally formed with the limit post 42, which can ensure the strength and stability of the limit structure 4. Of course, the top wire 41 can also be fixedly connected with the limit post 42 in other ways, as long as the limit can be guaranteed. The strength and stability of the bit structure 4 may be sufficient, which is not limited in this embodiment of the present application.

Wherein, the end of the top wire 41 opposite to the limit post 42 may be in a hexagonal structure, so that the top wire 41 can be easily adjusted with a wrench.

Wherein, the cross-sectional diameter of the limit post 42 may be slightly smaller than the slot width of the limit slot, so that the limit post 42 can be extended into the limit slot.

In some embodiments, when the outer wall of the valve plug 2 has a stepped structure, or the inner wall of the nipple cover 1 has a stepped structure, a pressure relief is provided on the side wall of the nipple cover 1 connected to the top wire 41 The hole 11 and the pressure relief hole 11 can communicate with the first chamber when the top wire 41 is unscrewed.

Wherein, when the nozzle sleeve 1 is provided with a branch pipe, the pressure relief hole 11 may be provided on the side wall of the branch pipe. In this way, when the top wire 41 is tightened, the top wire 41 can block the pressure relief hole 11, and when the top wire 41 is loosened, the pressure relief hole 11 can pass through the annular shape formed by the outer wall of the valve plug 2 and the inner wall of the nozzle sleeve 1 The space communicates with the first chamber and the outer space of the mouthpiece 1 so that the gas in the first chamber can be discharged from the mouthpiece 1 through the pressure relief hole 11 .

Wherein, loosening the top screw 41 means moving the top screw 41 in a direction away from the valve plug 2 , and tightening the top screw 41 means moving the top screw 41 in a direction close to the valve plug 2 .

It should be noted that, before disassembling the sealing structure 5, the top wire 41 can be unscrewed, so that the gas in the first chamber can be discharged from the nozzle sleeve 1, so that the pressure in the first chamber can be reduced, so as to avoid the first When the pressure in a chamber is too high, when the sealing structure 5 is disassembled, the sealing structure 5 is likely to fly away from the mouthpiece cover 1 quickly, thereby injuring the staff.

In the embodiment of the present application, the outer wall of the end of the valve plug with the larger aperture is provided with a limiting groove, the limiting structure is sealedly connected with the side wall of the mouth sleeve, and one end of the limiting structure can be stuck in the limiting groove, so that , the limit structure can limit the valve plug through the limit groove, thereby preventing the valve plug from falling off. In addition, the first end of the nipple sleeve is connected to the casing, and the third end of the nipple sleeve is connected to the oil pipe. The first end of the pressure regulating structure can be moved by the action of external force, and then the two chambers are connected to realize The release of gas in the casing to the tubing. The blocking boss can prevent the first end of the pressure regulating structure from separating from the valve plug. The second end of the pressure regulating structure can protrude from the sealing structure, so it is convenient to adjust the pressure regulating structure outside the casing valve at any time, and the release frequency of the casing pressure can be controlled at any time.

The above descriptions are only illustrative embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims (10)

1. An air sleeve valve, characterized in that the air sleeve valve comprises: a nozzle sleeve (1), a valve plug (2), a pressure regulating structure (3), a limiting structure (4) and a sealing structure (5) ); The valve plug (2) is provided with a stepped hole in the axial direction, the valve plug (2) is arranged in the inner cavity of the mouthpiece sleeve (1), and the valve plug (2) has an end with a smaller hole diameter It is fixedly connected with the inner wall of the first end of the mouthpiece cover (1) to separate the mouthpiece cover (1) into two chambers, and the valve plug (2) has a larger upper aperture at the end. The outer wall is provided with a limit slot; One end of the limiting structure (4) passes through the side wall of the mouthpiece cover (1), and is sealedly connected with the side wall of the mouthpiece cover (1), and one end of the limiting structure (4) stuck in the limit slot; The pressure regulating structure (3) is connected to the inner wall of one end of the valve plug (2) with a large hole diameter, the first end of the pressure regulating structure (3) can block the stepped hole, and the pressure regulating structure The first end of (3) can move under the action of external force to conduct the two chambers; The first end of the mouthpiece cover (1) is used for connecting with the sleeve, and the second end of the mouthpiece cover (1) opposite to the first end is detachably sealed with the sealing structure (5). connection, the third end of the mouthpiece sleeve (1) is used to connect with the oil pipe. 2. The air sleeve valve according to claim 1, wherein the limiting structure (4) comprises a top wire (41) and a limiting post (42); The side wall of the mouthpiece sleeve (1) is provided with a threaded through hole, the ejector wire (41) is fixedly connected with the threaded through hole, and one end of the ejector wire (41) is connected to the limit post (42). ) are fixedly connected, and the second end of the limiting column (42) is clamped in the limiting slot. 3. The air sleeve valve according to claim 2, characterized in that, a pressure relief hole (11) is provided on the side wall of the nozzle sleeve (1) connected with the top wire (41), and the The pressure relief hole (11) can communicate with a first chamber when the top wire (41) is unscrewed, and the first chamber refers to a chamber used for communicating with the oil pipe among the two chambers . 4. The gas sleeve valve according to claim 1, wherein the pressure regulating structure (3) comprises: a valve stem (31), an elastic member (32), and a pressure regulating ball (33); The side wall of the first end of the valve rod (31) is provided with an exhaust groove which communicates with the first chamber, and the first chamber refers to one of the two chambers used to communicate with the oil pipe. a chamber, wherein the side wall of the first end of the valve stem (31) is threadedly connected to the inner wall of the end of the valve plug (2) with a larger aperture; The first end of the valve rod (31) is connected with the first end of the elastic member (32), and the second end of the elastic member (32) abuts on the pressure regulating ball (33), so The pressure regulating ball (33) is used to block the stepped hole, and the pressure regulating ball (33) can move under the action of external force to conduct the second chamber and the exhaust groove, and the second chamber Chamber refers to the one of the two chambers for communication with the cannula. 5 . The sleeve gas valve according to claim 4 , wherein the second end of the valve stem ( 31 ) has a hexagonal prism-like structure. 6 . 6 . The sleeve gas valve according to claim 1 , wherein a central through hole is provided on the sealing structure ( 5 ), and the second end of the pressure regulating structure ( 3 ) passes through the central through hole. 7 . , and is sealingly connected with the sealing structure (5). 7. The casing valve according to claim 6, wherein the sealing structure (5) comprises a plug (51), a sealing packing (52) and a gland (53); The plug (51), the sealing packing (52) and the gland (53) are sequentially sleeved on the pressure regulating structure (3), and the plug (51) and the mouthpiece The second end of the sleeve (1) is fixedly connected, the gland (53) is fixedly connected to the plug (51), and the sealing packing (52) is used to seal the pressure regulating structure (3) and the the gap between the plugs (51). 8 . The air sleeve valve according to claim 1 , wherein the pressure regulating structure ( 3 ) is provided with a resisting boss ( 34 ), and the resisting boss ( 34 ) is located in the first chamber. 9 . , the first chamber refers to one of the two chambers that is close to the second end of the mouthpiece cover (1). 9. The air sleeve valve according to claim 8, characterized in that, the maximum distance between the resisting boss (34) and the sealing structure (5) is less than a distance threshold, and the distance threshold refers to preventing The minimum distance separating the first end of the pressure regulating structure (3) from the valve plug (2). 10. The air sleeve valve according to claim 1, characterized in that, the air sleeve valve further comprises a sealing ring, the inner wall of the second end of the nozzle sleeve (1) is provided with a stepped platform, and the sealing ring is located on the inner wall of the second end of the nozzle sleeve (1) On the step surface of the step platform, the sealing structure (5) abuts on the sealing ring, and is in sealing connection with the second end of the mouthpiece sleeve (1).

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