CN118669091A - A prevent leaking well head gate valve for oil development - Google Patents

Abstract

The present invention discloses a leak-proof wellhead gate valve for oil extraction, which relates to the technical field of oil extraction, and includes a housing, a valve core mechanism, and a leak-proof component. The valve core mechanism includes a connecting seat and a support block. A threaded rod is sealed and installed at the center of the connecting seat, a rotating wheel is fixedly installed at the top of the threaded rod, a control valve block is rotatably installed at the bottom of the threaded rod, a sealing gasket is installed at the middle of the outer side of the control valve block, and a support component is installed inside the control valve block. The leak-proof component includes an annular limit groove and a plugging ring. A conical annular ring is installed on the plugging surface outside the plugging ring. Both the plugging ring and the conical annular ring are hollow. A support ring is fixedly installed at the middle of the inner side of the plugging ring, and a filling ring is fixedly installed at the side of the outer side of the support ring. The leak-proof wellhead gate valve for oil extraction achieves the effect of leak-proof, reduces the impact of fluid impact, has good sealing effect, is not prone to leakage, and is safe and reliable.

Description

A leak-proof wellhead gate valve for oil production

Technical Field

The invention relates to the technical field of oil exploitation, in particular to a leakage-proof wellhead gate valve used for oil exploitation.

Background Art

Oil is an important energy source. Compared with coal, it has the advantages of high energy density, convenient transportation and storage, and less pollution to the atmosphere after combustion. Oil is a fluid mineral buried deep underground, and the oil wellhead is an important equipment in the oil extraction process. Oil is an important resource, known as the blood of industry. It is generally extracted from the oil reservoir in the oil field. A gate valve will be installed at the wellhead of the oil field to control the circulation of oil. When extracting oil, the oil pump sucks the oil in the reservoir into the oil pipe, and then discharges it through the wellhead gate valve to extract the oil. The gate valve is a valve with a gate as the opening and closing part. The gate moves up and down along the vertical direction of the center line of the valve body channel, and the movement direction is perpendicular to the flow direction of the medium. The gate valve can only be fully opened and fully closed in the pipeline to cut off the flow of the medium, and cannot be used as a condition or to control the flow.

At present, when oil is transported, the wellhead gate valve is easily affected by the impact of the oil fluid during transportation at the connection with the oil pipeline, which causes the wellhead gate valve to easily deviate from the oil pipeline seal, thereby causing leakage and wasting resources.

Summary of the invention

To achieve the above objectives, the present invention is implemented through the following technical solutions: a leak-proof wellhead gate valve for oil production, comprising:

The housing has a shell for supporting the equipment structure, a top cover is installed on the top of the housing, and an oil outlet and an oil inlet are installed on the corresponding two sides of the housing respectively;

A valve core mechanism, the valve core mechanism is used to cut off and control the flow of petroleum fluid, and the valve core mechanism is installed inside the housing;

Wherein, the valve core mechanism comprises a connecting seat and a supporting block, the connecting seat is installed on the top of the top cover by screws, the supporting block is fixedly installed at the side of the inner cavity of the shell, and the supporting block is installed at a bottom position close to the inner cavity of the shell, a threaded rod is sealingly installed at the center of the connecting seat, a rotating wheel is fixedly installed at the top of the threaded rod, a control valve block is rotatably installed at the bottom end of the threaded rod, a sealing gasket is installed in the middle of the outer side of the control valve block, and a supporting assembly is installed inside the control valve block, the threaded rod is driven to rotate by the rotating wheel, and the threaded rod is moved up and down by forward and reverse rotation, and the bottom end of the threaded rod is rotatably installed with the top of the control valve block, so that the control valve block can be lifted and pushed downward, and then the sealing gaskets symmetrically on both sides cooperate with the ports of the oil outlet and the oil inlet, so as to achieve the effect of opening the flow of oil and cutting off the flow.

At the same time, the control valve block is installed inside the shell, and the control valve block is limited by the cavity inside the shell, so that the control valve block is not prone to tilt;

Also includes:

An anti-leakage component, which is used to seal the connection between the oil outlet and the oil inlet, and is installed at the oil outlet of the oil outlet and the oil inlet of the oil inlet;

Wherein, the anti-leakage component includes an annular limiting groove and a sealing ring, the annular limiting groove is arranged at the oil outlet of the oil outlet and the oil inlet of the oil inlet, the sealing ring is installed at the side of the oil outlet and the side of the oil inlet, and the oil outlet and the oil inlet are sealed and adapted to the oil pipe through the sealing ring, the sealing ring and the annular limiting groove are at the same height, the sealing surface of the outer side of the sealing ring is installed with a conical annular ring, the sealing ring and the conical annular ring are both hollow, a supporting ring is fixedly installed in the middle of the sealing ring, a filling ring is fixedly installed on the side of the outer side of the supporting ring, the oil outlet and the oil inlet are connected with the external oil pipeline port, and under the fixing of the bolts, the sealing ring installed in the middle is squeezed, thereby preliminarily sealing the pipeline connection;

At the same time, under the action of the connection pressure, the filling ring is located inside the conical annular ring, and with the support of the filling ring, the conical annular ring is embedded in the annular limiting groove, and then the conical annular ring and the annular limiting groove cooperate with each other to achieve a step-type seal. The multiple seals provide a good sealing effect and are less likely to leak. The connections between the structures are fully utilized to connect the mechanisms together.

Preferably, the support blocks are evenly distributed on the sides of the bottom of the control valve block, which facilitates the bottom of the control valve block to fit with the top of the support block so that the control valve block is positioned. The control valve block is installed directly below the threaded rod, which facilitates the control valve block to move up and down through the threaded rod.

Preferably, the sealing gasket is made of rubber, two sealing gaskets are provided, and the two sealing gaskets are symmetrically arranged along the control valve block, so as to facilitate the use of two symmetrical sealing gaskets to cooperate with the oil outlet and the oil inlet.

Preferably, the support assembly includes a cavity, the cavity is opened in the middle of the control valve block, a circular block is installed in the middle of the cavity, a supporting round rod and a strip elastic sheet are fixedly installed at both ends of the circular block, a pushing disc is fixedly installed at one end of the supporting round rod away from the circular block, the middle of the outer side of the pushing disc is an arc surface, the outer side of the pushing disc is in contact with the outer side of the sealing gasket, the pushing disc and the sealing gasket are installed at the same height, and the two sealing gaskets are located at the ports of the oil outlet and the oil inlet to perform the blocking;

At the same time, under the elastic force of the strip elastic sheet, and by utilizing the circular block to move horizontally in the cavity, the support of the supporting round rod can be utilized to enable the pushing disc to exert an outward pushing force on the sealing gasket, thereby making the two symmetrical sealing gaskets fit tightly with the ports of the oil outlet and the oil inlet, thereby achieving a good sealing effect on the oil.

Preferably, the strip elastic sheet is arc-shaped, which facilitates elastic deformation of the strip elastic sheet after being subjected to pressure, and the strip elastic sheet is evenly distributed on the sides of the outer side of the circular block, which can increase the elastic supporting force. There are two circular blocks, and the two circular blocks are symmetrically arranged along the strip elastic sheet.

By utilizing the outward pushing force of the push disc on the sealing gasket, the middle part of the sealing gasket will extend to the inside of the oil outlet and the inside of the oil inlet, reducing the influence of the oil fluid pressure and making it less likely to adapt to the seepage.

Preferably, the material of the sealing ring and the material of the conical annular ring are both set to rubber material to facilitate sealing. There are two filling rings, and the two filling rings are symmetrically arranged along the supporting ring to facilitate filling the space inside the conical annular ring.

Preferably, a pretreatment component is installed on the outer side of the oil inlet, and the pretreatment component includes a circular shell, the center of the circular shell is installed in the middle of the outer side of the oil inlet, a shunt pipe is installed between the side of the outer side of the circular shell and the oil inlet, the shunt pipe, the circular shell and the oil inlet are connected, and an annular filter net is fixedly installed inside the circular shell, and an auxiliary module is installed at the center of the annular filter net, so that petroleum fluid enters the circular shell and is filtered in time by the annular filter net, thereby performing preliminary treatment on the debris, reducing the amount of impurities entering the outer shell, reducing the contact between the sand impurities and the sealing gasket, reducing the wear on the sealing gasket, and extending the service life of the sealing gasket, which is conducive to long-term use.

Preferably, the diversion pipes are evenly distributed between the side of the outer side of the circular shell and the oil inlet, so as to discharge the oil in the circular shell into the oil inlet. The annular filter net is installed in the middle of the circular shell to filter the impurities carried by the oil.

Preferably, the auxiliary module includes a guide cone, the outer edge of the guide cone is fixedly installed at the center of the annular filter residue net, a zigzag spring plate is fixedly installed at the arc surface of the inner cavity of the guide cone, a right-angle rod is fixedly installed at the bend of the outer side of the zigzag spring plate, and a round ball is fixedly connected to one end of the right-angle rod away from the zigzag spring plate. The guide cone is located in the middle of the oil inlet, and the oil returns to the circular shell under the guidance of the guide cone.

At the same time, as the petroleum fluid flows back into the oil inlet from the diversion pipe, the fluid pressure of the petroleum fluid itself is used to impact the end of the zigzag spring plate, causing the zigzag spring plate to bend and deform, and through the support of the right-angle rod, the spherical ball knocks on the inner cavity of the guide cone, and most of the petroleum fluid enters the outer shell, while a small amount of fluid flows in a rewinding manner under the action of the warping edge of the zigzag spring plate, so that the zigzag spring plate is subjected to reciprocating impact, causing the guide cone to vibrate under the impact, and thus making it difficult for sand particles to adhere to the conical surface outside the guide cone, which helps the sand particles to fall off into the annular filter residue net, achieving a self-cleaning effect and making full use of the impact of the fluid to connect the structure together.

Preferably, the curved spring plates are evenly distributed on the arc surface of the inner cavity of the guide cone, and the sphere is installed on the conical surface close to the inner cavity of the guide cone, so as to facilitate the use of the sphere to knock the inner cavity of the guide cone.

The present invention provides a leak-proof wellhead gate valve for oil production, which has the following beneficial effects:

1. The anti-leakage wellhead gate valve used for oil extraction can lift and push the control valve block downward by moving the threaded rod, and then cooperate with the ports of the oil outlet and the oil inlet through the symmetrical sealing gaskets on both sides, so as to achieve the effect of opening the flow of oil and cutting off the flow. At the same time, the control valve block is installed inside the shell, and the control valve block is limited by the cavity inside the shell, so that the control valve block is not easy to be skewed.

2. The leak-proof wellhead gate valve used for oil extraction can be sealed by using two sealing gaskets at the ports of the oil outlet and the oil inlet. At the same time, under the elastic force of the strip elastic sheet and by using the circular block that can move horizontally in the cavity, the support of the supporting round rod can be used to enable the pushing disc to apply an outward pushing force to the sealing gasket, thereby making the two symmetrical sealing gaskets fit closely with the ports of the oil outlet and the oil inlet, so as to achieve a good sealing effect on the oil.

3. The leak-proof wellhead gate valve used for oil extraction utilizes the outer pushing force of the sealing gasket by the pushing disk, and the middle part of the sealing gasket will extend to the inside of the oil outlet and the inside of the oil inlet, thereby reducing the influence of the oil fluid pressure and making it less likely to adapt to the seepage.

Fourth, the leak-proof wellhead gate valve used for oil extraction utilizes the sealing ring to be squeezed to perform preliminary sealing on the pipeline connection. At the same time, under the action of the connection pressure, the filling ring is located inside the conical annular ring, and the conical annular ring is embedded in the annular limit groove by the support of the filling ring. Then, the conical annular ring and the annular limit groove cooperate with each other to achieve a stepped seal. The multiple seals make the sealing effect good and are not prone to leakage.

5. The leak-proof wellhead gate valve used for oil extraction utilizes the flow of the oil fluid itself. At this time, the oil fluid enters the circular shell and is filtered by the annular filter residue net in time to filter the sand impurities carried by the oil fluid, thereby performing preliminary treatment on the debris, reducing the entry of impurities into the shell, reducing the contact between the sand impurities and the sealing gasket, reducing the wear on the sealing gasket, and extending the service life of the sealing gasket, which is conducive to long-term use.

6. The leak-proof wellhead gate valve used for oil extraction utilizes the fluid pressure of the oil fluid itself to impact the end of the zigzag spring plate, causing the zigzag spring plate to bend and deform. At this time, the spherical ball strikes the inner cavity of the guide cone, and most of the oil fluid enters the outer shell, while a small amount of fluid flows in a revolving manner under the action of the warping edge of the zigzag spring plate, thereby causing the zigzag spring plate to be impacted reciprocatingly, causing the guide cone to vibrate under the impact, thereby making it difficult for sand particles to adhere to the conical surface outside the guide cone, which helps the sand particles to fall off into the annular filter residue net, thereby achieving a self-cleaning effect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of an anti-leakage wellhead gate valve for oil production according to the present invention;

FIG2 is a schematic diagram of the disassembled structure of the anti-leakage wellhead gate valve used for oil production according to the present invention;

FIG3 is a schematic diagram of the internal structure of the housing cross section of the present invention;

FIG4 is a schematic diagram of the overall structure of the valve core mechanism of the present invention;

FIG5 is a schematic diagram of the internal structure of a control valve block in cross section according to the present invention;

FIG6 is a schematic diagram of the overall structure of the anti-leakage assembly of the present invention;

FIG7 is a schematic diagram of the cross-sectional internal structure of the sealing ring and the conical annular ring of the present invention;

FIG8 is a schematic diagram of the connection structure between the pretreatment component and the oil inlet of the present invention;

FIG9 is a schematic diagram of the internal structure of a circular shell in cross section according to the present invention;

FIG10 is a schematic diagram of the connection structure between the auxiliary module and the annular filter residue net of the present invention;

FIG. 11 is a schematic diagram of the side structure of the auxiliary module of the present invention.

In the figure: 1. shell; 2. top cover; 3. oil outlet; 4. oil inlet; 5. valve core mechanism; 6. anti-leakage component; 7. pretreatment component; 51. connecting seat; 52. support block; 53. threaded rod; 54. runner; 55. control valve block; 56. sealing gasket; 57. support component; 61. annular limit groove; 62. sealing ring; 63. conical annular ring; 64. support ring; 65. filling ring; 571. cavity; 572. circular block; 573. supporting circular rod; 574. pushing disc; 575. strip elastic sheet; 71. circular shell; 72. diverter pipe; 73. annular filter residue net; 74. auxiliary module; 741. guide cone; 742. zigzag spring plate; 743. right-angle rod; 744. sphere.

DETAILED DESCRIPTION

The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

In the first embodiment, as shown in FIGS. 1 to 5 , the present invention provides a technical solution: a leak-proof wellhead gate valve for oil production, comprising:

The housing 1 has a shell for supporting the equipment structure, a top cover 2 is installed on the top of the housing 1, and an oil outlet 3 and an oil inlet 4 are installed on the corresponding two sides of the housing 1;

A valve core mechanism 5, which is used to cut off and control the flow of petroleum fluid, and the valve core mechanism 5 is installed inside the housing 1;

The valve core mechanism 5 includes a connecting seat 51 and a supporting block 52. The connecting seat 51 is installed on the top of the top cover 2 by screws. The supporting block 52 is fixedly installed at the side of the inner cavity of the shell 1, and the supporting block 52 is installed at the bottom position close to the inner cavity of the shell 1. A threaded rod 53 is sealed and installed at the center of the connecting seat 51. A rotating wheel 54 is fixedly installed at the top of the threaded rod 53. A control valve block 55 is rotatably installed at the bottom of the threaded rod 53. A sealing gasket 56 is installed in the middle of the outer side of the control valve block 55. A supporting assembly 57 is installed inside the control valve block 55. The staff twists the rotating wheel 54 to rotate the threaded rod 53, and the threaded rod 53 is rotated and moved up and down by forward and reverse rotation, and the bottom end of the threaded rod 53 is rotated to the top of the control valve block 55. The control valve block 55 can be lifted and pushed downward, and then the sealing gaskets 56 on both sides are matched with the ports of the oil outlet 3 and the ports of the oil inlet 4, so as to achieve the effect of opening the flow of oil and cutting off the flow.

At the same time, the control valve block 55 is installed inside the housing 1, and the control valve block 55 is limited by the cavity inside the housing 1, so that the control valve block 55 is not prone to tilting;

The support blocks 52 are evenly distributed on the sides of the bottom of the control valve block 55, which makes it easy to fit the bottom of the control valve block 55 with the top of the support blocks 52, so that the control valve block 55 is positioned. The control valve block 55 is installed directly below the threaded rod 53, which makes it easy to drive the control valve block 55 to move up and down through the threaded rod 53.

The sealing gasket 56 is made of rubber. Two sealing gaskets 56 are provided, and the two sealing gaskets 56 are symmetrically arranged along the control valve block 55, so that the two symmetrical sealing gaskets 56 can be matched with the oil outlet 3 and the oil inlet 4.

The support assembly 57 includes a cavity 571, which is opened in the middle of the control valve block 55. A circular block 572 is installed in the middle of the cavity 571. A supporting round rod 573 and a strip elastic sheet 575 are fixedly installed at both ends of the circular block 572. A pushing disc 574 is fixedly installed at one end of the supporting round rod 573 away from the circular block 572. The middle of the outer side of the pushing disc 574 is an arc surface. The outer side of the pushing disc 574 is in contact with the outer side of the sealing gasket 56. The pushing disc 574 and the sealing gasket 56 are installed at the same height. When the control valve block 55 is pushed downward by the threaded rod 53, the two sealing gaskets 56 are used to seal the port of the oil outlet 3 and the port of the oil inlet 4.

At the same time, under the elastic force of the strip elastic sheet 575, and by utilizing the circular block 572 to move horizontally in the cavity 571, the support of the supporting round rod 573 can be utilized to enable the pushing disc 574 to apply an outward pushing force to the sealing gasket 56, thereby making the two symmetrical sealing gaskets 56 fit tightly with the ports of the oil outlet 3 and the oil inlet 4, so as to achieve a good sealing effect on the oil.

The strip elastic sheet 575 is arc-shaped, which facilitates the elastic deformation of the strip elastic sheet 575 after being subjected to pressure, and the strip elastic sheet 575 is evenly distributed on the sides outside the circular block 572 to increase the elastic supporting force. There are two circular blocks 572, and the two circular blocks 572 are symmetrically arranged along the strip elastic sheet 575.

By utilizing the outward pushing force of the push disc 574 on the sealing gasket 56, the middle of the sealing gasket 56 will extend to the inside of the oil outlet 3 and the inside of the oil inlet 4, reducing the influence of the oil fluid pressure and making it less likely to adapt to seepage.

The second embodiment, as shown in FIG. 1 to FIG. 7 , is based on the first embodiment:

Also includes:

The anti-leakage component 6 is used to seal the connection between the oil outlet 3 and the oil inlet 4. The anti-leakage component 6 is installed at the oil outlet of the oil outlet 3 and the oil inlet of the oil inlet 4;

The anti-leakage component 6 includes an annular limiting groove 61 and a sealing ring 62. The annular limiting groove 61 is provided at the oil outlet of the oil outlet 3 and the oil inlet of the oil inlet 4. The sealing ring 62 is installed at the side of the oil outlet 3 and the side of the oil inlet 4. The oil outlet 3 and the oil inlet 4 are sealed and adapted to the oil pipe through the sealing ring 62. The sealing ring 62 and the annular limiting groove 61 are at the same height. The sealing surface of the outer side of the sealing ring 62 is installed with a conical annular ring 63. The sealing ring 62 and the conical annular ring 63 are both hollow. A support ring 64 is fixedly installed in the middle of the sealing ring 62. A filling ring 65 is fixedly installed on the side of the outer side of the support ring 64. The oil outlet 3 and the oil inlet 4 are connected to the external oil pipeline port, and under the fixation of bolts, the sealing ring 62 installed in the middle is squeezed, thereby preliminarily sealing the pipeline connection.

At the same time, under the action of the connection pressure, the filling ring 65 is located inside the conical annular ring 63, and with the support of the filling ring 65, the conical annular ring 63 is embedded in the annular limiting groove 61, and then the conical annular ring 63 and the annular limiting groove 61 cooperate with each other to achieve a step-type seal.

The material of the sealing ring 62 and the material of the conical annular ring 63 are both set to rubber material for easy sealing. Two filling rings 65 are provided, and the two filling rings 65 are symmetrically arranged along the support ring 64 to fill the space inside the conical annular ring 63.

The third embodiment, as shown in FIGS. 1 to 5 and 8 to 11 , is based on the first embodiment:

A pretreatment component 7 is installed on the outer side of the oil inlet 4. The pretreatment component 7 includes a circular shell 71. The center of the circular shell 71 is installed in the middle of the outer side of the oil inlet 4. A shunt pipe 72 is installed between the side of the outer side of the circular shell 71 and the oil inlet 4. The shunt pipe 72, the circular shell 71 and the oil inlet 4 are connected. An annular filter residue net 73 is fixedly installed inside the circular shell 71. An auxiliary module 74 is installed at the center of the annular filter residue net 73. When the petroleum fluid enters from the oil inlet 4, the flow of the petroleum fluid itself is utilized. At this time, the petroleum fluid enters the circular shell 71, and under the filtration of the annular filter residue net 73, the sand impurities carried by the petroleum fluid are filtered in time, and then the debris is preliminarily processed, and the impurities entering the outer shell 1 are reduced, and the contact between the sand impurities and the sealing gasket 56 is reduced, and the wear on the sealing gasket 56 is reduced. At this time, the filtered oil flows back to the oil inlet 4 from the shunt pipe 72, so that the oil can smoothly enter the outer shell 1.

The shunt pipe 72 is evenly distributed between the outer side of the circular shell 71 and the oil inlet 4, so as to discharge the oil in the circular shell 71 into the oil inlet 4. The annular filter net 73 is installed in the middle of the circular shell 71 to filter the impurities carried by the oil.

The auxiliary module 74 includes a guide cone 741, the outer edge of the guide cone 741 is fixedly installed at the center of the annular filter residue net 73, a curved spring plate 742 is fixedly installed at the arc surface of the inner cavity of the guide cone 741, a right-angle rod 743 is fixedly installed at the bend of the outer side of the curved spring plate 742, and a round ball 744 is fixedly connected to the end of the right-angle rod 743 away from the curved spring plate 742. With the guide cone 741 in the middle of the oil inlet 4, the oil returns to the circular shell 71 under the guidance of the guide cone 741;

At the same time, as the petroleum fluid flows back to the oil inlet 4 from the diversion pipe 72, the fluid pressure of the petroleum fluid itself is used to impact the end of the zigzag spring plate 742, causing the zigzag spring plate 742 to bend and deform, and through the support of the right-angle rod 743, the ball 744 knocks the inner cavity of the guide cone 741, and most of the petroleum fluid enters the outer shell 1, while a small amount of fluid flows in a roll-back manner under the action of the warping edge of the zigzag spring plate 742, so that the zigzag spring plate 742 is subjected to reciprocating impacts, causing the guide cone 741 to vibrate under the impact, making it difficult for sand particles to adhere to the conical surface outside the guide cone 741, which helps the sand particles to fall off into the annular filter residue net 73 for self-cleaning.

The curved spring plates 742 are evenly distributed on the arc surface of the inner cavity of the guide cone 741 , and the spheres 744 are installed on the conical surface close to the inner cavity of the guide cone 741 , so that the inner cavity of the guide cone 741 can be knocked by the spheres 744 .

When in use, the staff places the leakage assembly 6 on the ports of the oil outlet 3 and the oil inlet 4, and connects the oil outlet 3 and the oil inlet 4 with the external oil pipeline port, and under the fixing of the bolts, the sealing ring 62 installed in the middle is squeezed, thereby preliminarily sealing the pipeline connection;

At the same time, under the action of the connection pressure, the filling ring 65 is located inside the conical ring ring 63, and the conical ring ring 63 is embedded in the annular limiting groove 61 by the support of the filling ring 65, and then the conical ring ring 63 and the annular limiting groove 61 cooperate with each other to achieve a step-type seal, which is not easy to leak;

At this time, the staff turns the rotating wheel 54, thereby rotating the threaded rod 53, and uses the threaded rod 53 to move, and the bottom end of the threaded rod 53 and the top of the control valve block 55 are rotatably installed, so that the control valve block 55 can be lifted, and then the sealing gaskets 56 on both sides are symmetrically released from the ports of the oil outlet 3 and the oil inlet 4, so as to open the gate;

At this time, the oil enters from the oil inlet 4, and the guide cone 741 is located in the middle of the oil inlet 4. At this time, the oil returns to the circular shell 71 under the guidance of the guide cone 741;

And by utilizing the flow of the petroleum fluid itself, the petroleum fluid enters the circular shell 71 at this time, and under the filtration of the annular filter residue net 73, the sand impurities carried by the petroleum fluid are filtered in time, and then the impurities are preliminarily processed, and the impurities entering the shell 1 are reduced, and the contact between the sand impurities and the sealing gasket 56 is reduced, and the wear of the sealing gasket 56 is reduced. At this time, the filtered oil flows back to the oil inlet 4 from the diverter pipe 72, so that the oil can smoothly enter the shell 1.

At the same time, as the oil fluid flows back to the oil inlet 4 from the diverter pipe 72, the oil fluid's own fluid pressure is used to impact the end of the zigzag spring plate 742, causing the zigzag spring plate 742 to bend and deform, and through the support of the right-angle rod 743, the ball 744 knocks the inner cavity of the guide cone 741, and most of the oil fluid enters the housing 1, while a small amount of fluid flows in a revolving manner under the action of the warping edge of the zigzag spring plate 742, so that the zigzag spring plate 742 is subjected to reciprocating impacts, causing the guide cone 741 to vibrate under the impact, and thus making it difficult for sand particles to adhere to the conical surface outside the guide cone 741, which helps the sand particles to fall off into the annular filter residue net 73 for self-cleaning;

At this time, the oil enters the interior of the housing 1 and is discharged through the oil outlet 3;

When it is necessary to cut off the flow of oil, the threaded rod 53 is rotated in the opposite direction by the rotating wheel 54, and the control valve block 55 moves downward, and cooperates with the ports of the oil outlet 3 and the oil inlet 4 through the symmetrical sealing pads 56 on both sides, thereby realizing the cutoff and stoppage of the flow of oil. Moreover, under the elastic force of the strip elastic sheet 575, the circular block 572 can be moved horizontally in the cavity 571, and the support of the supporting circular rod 573 can be used to make the push disc 574 apply an outward push force to the sealing pad 56, so that the two symmetrical sealing pads 56 are tightly fitted with the ports of the oil outlet 3 and the oil inlet 4, so that the sealing effect of the oil is good.

After the oil is transported, the impurities inside the annular filter screen 73 can be cleaned.

Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims (10)

1. A leak-proof wellhead gate valve for oil production, characterized by comprising: A casing (1), the casing (1) comprising a shell body for supporting a device structure, a top cover (2) being mounted on the top of the casing (1), and an oil outlet (3) and an oil inlet (4) being mounted on corresponding two sides of the casing (1); A valve core mechanism (5), the valve core mechanism (5) is used to cut off and control the flow of petroleum fluid, and the valve core mechanism (5) is installed inside the housing (1); The valve core mechanism (5) comprises a connecting seat (51) and a supporting block (52), wherein the connecting seat (51) is mounted on the top of the top cover (2) by means of screws, the supporting block (52) is fixedly mounted on the side of the inner cavity of the housing (1), and the supporting block (52) is mounted near the bottom of the inner cavity of the housing (1), a threaded rod (53) is sealedly mounted at the center of the connecting seat (51), a rotating wheel (54) is fixedly mounted on the top of the threaded rod (53), a control valve block (55) is rotatably mounted on the bottom of the threaded rod (53), a sealing gasket (56) is mounted in the middle of the outer side of the control valve block (55), and a supporting assembly (57) is mounted inside the control valve block (55); Also includes: An anti-leakage component (6), the anti-leakage component (6) being used to seal the connection between the oil outlet (3) and the oil inlet (4), the anti-leakage component (6) being installed at the oil outlet of the oil outlet (3) and the oil inlet of the oil inlet (4); The anti-leakage component (6) comprises an annular limiting groove (61) and a sealing ring (62); the annular limiting groove (61) is provided at the oil outlet of the oil outlet (3) and the oil inlet of the oil inlet (4); the sealing ring (62) is installed at the side of the oil outlet (3) and the side of the oil inlet (4); the oil outlet (3) and the oil inlet (4) are sealed and adapted to the oil pipe through the sealing ring (62); the sealing ring (62) and the annular limiting groove (61) are at the same height; a conical annular ring (63) is installed on the sealing surface outside the sealing ring (62); the sealing ring (62) and the conical annular ring (63) are both hollow; a support ring (64) is fixedly installed in the middle of the sealing ring (62); and a filling ring (65) is fixedly installed on the side outside the support ring (64). 2. A leak-proof wellhead gate valve for oil production according to claim 1, characterized in that the support blocks (52) are evenly distributed on the sides of the bottom of the control valve block (55), and the control valve block (55) is installed directly below the threaded rod (53). 3. The anti-leakage wellhead gate valve for oil extraction according to claim 1, characterized in that: the material of the sealing gasket (56) is rubber, two sealing gaskets (56) are provided, and the two sealing gaskets (56) are symmetrically arranged along the control valve block (55). 4. A leak-proof wellhead gate valve for oil production according to claim 1, characterized in that: the support assembly (57) comprises a cavity (571), the cavity (571) is opened in the middle of the control valve block (55), a circular block (572) is installed in the middle of the cavity (571), a supporting round rod (573) and a strip elastic sheet (575) are fixedly installed at both ends of the circular block (572), a pushing disc (574) is fixedly installed at one end of the supporting round rod (573) away from the circular block (572), the middle of the outer side of the pushing disc (574) is an arc surface, the outer side of the pushing disc (574) is in contact with the outer side of the sealing gasket (56), and the pushing disc (574) and the sealing gasket (56) are installed at the same height. 5. A leak-proof wellhead gate valve for oil production according to claim 4, characterized in that: the strip elastic sheet (575) is arc-shaped, and the strip elastic sheet (575) is evenly distributed on the side of the outer side of the circular block (572), and there are two circular blocks (572), and the two circular blocks (572) are symmetrically arranged along the strip elastic sheet (575). 6. A leak-proof wellhead gate valve for oil production according to claim 1, characterized in that the material of the sealing ring (62) and the material of the conical annular ring (63) are both set to rubber material, and two filling rings (65) are provided, and the two filling rings (65) are symmetrically arranged along the support ring (64). 7. A leak-proof wellhead gate valve for oil production according to claim 1, characterized in that: a pretreatment component (7) is installed on the outer side of the oil inlet (4), and the pretreatment component (7) comprises a circular shell (71), the center of the circular shell (71) is installed in the middle of the outer side of the oil inlet (4), a shunt pipe (72) is installed between the side of the outer side of the circular shell (71) and the oil inlet (4), the shunt pipe (72), the circular shell (71) and the oil inlet (4) are connected, and an annular filter residue net (73) is fixedly installed inside the circular shell (71), and an auxiliary module (74) is installed at the center of the annular filter residue net (73). 8. A leak-proof wellhead gate valve for oil production according to claim 7, characterized in that the diverter pipe (72) is evenly distributed between the side of the outer side of the circular shell (71) and the oil inlet (4), and the annular filter screen (73) is installed in the middle of the circular shell (71). 9. A leak-proof wellhead gate valve for oil production according to claim 7, characterized in that: the auxiliary module (74) comprises a guide cone (741), the outer edge of the guide cone (741) is fixedly installed at the center of the annular filter residue net (73), a curved spring plate (742) is fixedly installed on the arc surface of the inner cavity of the guide cone (741), a right-angle rod (743) is fixedly installed at the bend of the outer side of the curved spring plate (742), and a ball (744) is fixedly connected to one end of the right-angle rod (743) away from the curved spring plate (742). 10. A leak-proof wellhead gate valve for oil production according to claim 9, characterized in that the curved spring plates (742) are evenly distributed on the arc surface of the inner cavity of the guide cone (741), and the spherical ball (744) is installed on the conical surface close to the inner cavity of the guide cone (741).