Ceramic throttle valve for christmas tree

Abstract

The utility model discloses a ceramic throttle valve for a christmas tree, which comprises a metal valve body, a cylindrical ceramic valve core arranged in an inner cavity of the metal valve body, a ceramic valve seat positioned outside the ceramic valve core, a ceramic tube arranged on the inner wall of a single-side medium inlet of the metal valve body, and a ceramic diffusion section arranged on the inner wall of a bottom medium outlet of the metal valve body. A plurality of throttling holes are formed in the ceramic valve element, the sliding sleeve is arranged above the ceramic valve element, and the driving shaft is arranged at the top end of the sliding sleeve. The driving shaft sequentially penetrates out of the center of the upper valve cover and the center of the packing gland and is connected with a driving device, a sliding sleeve lining is arranged on the inner side of the sliding sleeve, and an inner hole of the sliding sleeve lining is attached to the outer circle of the ceramic valve element in a contact mode. According to the utility model, the valve core adopts the cylindrical symmetrical opening design, so that natural gas forms hedging in the cavity after flowing through the throttling holes, part of kinetic energy can be converted into heat energy to be dissipated, the abrasion of the valve core is reduced, meanwhile, all easily-abraded parts are made of ceramic materials, and the service life of the throttling valve can be greatly prolonged by utilizing the natural abrasion-resistant characteristic of ceramic.

Description

Technical Field

[0001] The utility model relates to the technical field of throttle valves, and particularly relates to a ceramic throttle valve for a gas production tree. Background Art

[0002] At present, all the throttle valves used on the wellhead gas production trees in natural gas fields are metal throttle valves. Since natural gas contains formation sand grains, especially shale gas wells have a high sand content, and the pressure difference is large and the flow rate is fast, the erosion of the valve core is very strong. At present, the general service life of throttle valves in the industry does not exceed half a year, and some are even less than 1 month. It is necessary to frequently stop production to replace new valves on site, which not only affects production efficiency but also increases costs. Content of the Utility Model

[0003] To solve the technical problems mentioned in the background art, the utility model provides a ceramic throttle valve for a gas production tree.

[0004] The utility model adopts the following technical scheme: a ceramic throttle valve for a gas production tree, which is characterized in that it includes a metal valve body with a single-sided medium inlet and a bottom medium outlet; a cylindrical ceramic valve core is arranged at the center of the bottom of the inner cavity of the metal valve body; a ceramic valve seat is arranged outside the ceramic valve core through step positioning; the ceramic valve seat is tightly arranged at the bottom of the inner cavity of the metal valve body; the top of the metal valve body is connected with an upper valve cover through bolts; packing is arranged inside the top of the upper valve cover and is pressed tightly by a packing gland; a ceramic valve body lining is attached to the inner wall of the inner cavity of the metal valve body; a ceramic pipe is arranged on the inner wall of the single-sided medium inlet of the metal valve body; a ceramic diffusion section is arranged on the inner wall of the bottom medium outlet of the metal valve body; the top of the ceramic valve core extends above the top of the single-sided medium inlet; a plurality of throttle holes are opened on the ceramic valve core; the medium flows through the throttle holes from the single-sided medium inlet and forms a counterflush in the cavity of the ceramic valve core and then flows out from the bottom medium outlet; a sliding sleeve is arranged above the ceramic valve core; a driving shaft is arranged at the top of the sliding sleeve; the driving shaft passes through the centers of the upper valve cover and the packing gland in sequence and is connected with a driving device; a sliding sleeve lining is arranged inside the sliding sleeve; the inner hole of the sliding sleeve lining contacts and fits with the outer circle of the ceramic valve core, and can slide up and down along the outer circle of the ceramic valve core under the drive of the driving device to change the area of contact between the throttle holes and the medium; when the sliding sleeve moves to the lowest position, the sliding sleeve lining is tightly attached to the inclined surface on the ceramic valve seat to cut off the medium and close it.

[0005] Further, the throttle holes on the ceramic valve core adopt a symmetric hole opening design.

[0006] Further, the bottom of the sliding sleeve lining and the top of the ceramic valve seat are respectively provided with wedge angles with the same angle adaptation.

[0007] Further, the ceramic diffusion section adopts a Venturi structure with a narrow upper part and a wide lower part.

[0008] Further, a graphite gasket is provided between the top end of the metal valve body and the upper valve cover.

[0009] Compared with the prior art, the advantages of the present utility model are as follows: for the ceramic throttle valve for gas production tree designed by the present utility model, the valve core adopts a cylindrical symmetrically perforated design, so that natural gas forms a counterflush inside the cavity after flowing through the throttle hole, which can convert part of the kinetic energy into heat energy and dissipate it, thereby reducing the wear of the valve core. At the same time, all the easily worn parts are made of ceramic material, and the natural wear-resistant characteristics of the ceramic can greatly improve the service life of the throttle valve. Description of the Drawings

[0010] Figure 1 is the overall structural schematic diagram of the ceramic throttle valve for gas production tree of the present utility model;

[0011] Figure 2 is the cross-section of the ceramic throttle valve for gas production tree of the present utility model in the use state Figure 1 ;

[0012] Figure 3 is the cross-section of the ceramic throttle valve for gas production tree of the present utility model in the use state Figure 2 .

[0013] Among them:

[0014] 1 - metal valve body, 2 - ceramic tube, 3 - graphite gasket, 4 - sliding sleeve, 5 - sliding sleeve inner lining, 6 - ceramic valve seat, 7 - ceramic valve body inner lining, 8 - ceramic diffusion section, 9 - ceramic valve core, 10 - upper valve cover, 11 - packing, 12 - packing gland, 13 - drive shaft. Detailed Embodiments

[0015] The following is a further description with reference to the accompanying drawings for the convenience of those skilled in the art to understand the technical solution of the present utility model. It should be understood that these descriptions are exemplary and not intended to limit the scope of the present utility model.

[0016] In the following detailed description, for the sake of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present utility model. However, obviously, one or more embodiments can also be implemented without these specific details. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present utility model.

[0017] As Figures 1-3As shown in the figure, the ceramic throttle valve for gas production tree designed by the utility model includes a metal valve body 1 with a single-sided medium inlet and a bottom medium outlet. A cylindrical ceramic valve core 9 is arranged at the center of the bottom of the inner cavity of the metal valve body 1. A ceramic valve seat 6 is arranged outside the ceramic valve core 9 through step positioning. The ceramic valve seat 6 is tightly arranged at the bottom of the inner cavity of the metal valve body 1. The top of the metal valve body 1 is connected to an upper valve cover 10 by bolts. A graphite gasket 3 is arranged between the top of the metal valve body 1 and the upper valve cover 10 to achieve top sealing. A packing 11 is arranged inside the top of the upper valve cover 10 and is pressed tightly by a packing gland 12. The material of the packing 11 includes but is not limited to polytetrafluoroethylene or graphite.

[0018] In this embodiment, a ceramic valve body lining 7 is attached to the inner wall of the inner cavity of the metal valve body 1 by means of gluing or hot fitting. A ceramic pipe 2 is arranged on the inner wall of the single-sided medium inlet of the metal valve body 1. A ceramic diffusion section 8 is arranged on the inner wall of the bottom medium outlet of the metal valve body 1. The ceramic parts can protect the inner cavity of the metal valve body 1 from being scoured by high-speed fluid. In this embodiment, the top of the ceramic valve core 9 extends above the top of the single-sided medium inlet to prevent the fluid medium from overflowing.

[0019] In this embodiment, a number of throttle holes are opened on the ceramic valve core 9. Specifically, the throttle holes on the ceramic valve core 9 adopt a symmetric hole-opening design. The hole-opening methods include but are not limited to round holes, square holes, V-shaped holes, etc., and can be specially designed according to different flow requirements to achieve linear adjustment or 100% adjustment. As Figure 3 shown, the fluid medium flows through the throttle holes from the single-sided medium inlet, forms a counterflow in the cavity of the ceramic valve core 9, and then flows out from the bottom medium outlet. The counterflow effect can convert part of the kinetic energy of the medium fluid into heat energy and dissipate it. A sliding sleeve 4 is arranged above the ceramic valve core 9. A driving shaft 13 is arranged at the top of the sliding sleeve 4. The driving shaft 13 passes through the centers of the upper valve cover 10 and the packing gland 12 in sequence and is connected to an external driving device. A sliding sleeve lining 5 is arranged inside the sliding sleeve 4. The inner hole of the sliding sleeve lining 5 is in contact with and fits the outer circle of the ceramic valve core 9, and can slide up and down along the outer circle of the ceramic valve core 9 under the drive of the driving device to change the area of contact between the throttle holes and the medium. Specifically, wedge angles with the same angle adaptation are respectively arranged at the bottom of the sliding sleeve lining 5 and the top of the ceramic valve seat 6. When the sliding sleeve 4 moves to the lowest position, the sliding sleeve lining 5 is in close contact with the inclined surface on the ceramic valve seat 6 to achieve medium cut-off and closing.

[0020] Preferably, in this embodiment, the ceramic diffusion section 8 adopts a Venturi structure with a narrow top and a wide bottom, which can greatly reduce the erosion of the high-speed fluid on the metal valve body.

[0021] In summary, for the ceramic throttle valve for gas production tree designed by the present utility model, the ceramic valve core adopts a cylindrical symmetrically perforated design, enabling the natural gas to form a counterflush inside the cavity after flowing through the throttle holes, being able to convert part of the kinetic energy into heat energy and dissipate it, thereby reducing the wear of the valve core. At the same time, all the easily worn parts are made of ceramic material, and by utilizing the natural wear-resistant characteristics of the ceramic, the service life of the throttle valve can be greatly improved.

[0022] The above embodiments are only used to describe the preferred embodiments of the present utility model, rather than to limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A ceramic throttle valve for a gas production tree, characterized in that, It includes a metal valve body (1) with a single-sided medium inlet and a bottom medium outlet; a cylindrical ceramic valve core (9) is arranged at the center of the bottom of the inner cavity of the metal valve body (1); a ceramic valve seat (6) is positioned outside the ceramic valve core (9) through a step; the ceramic valve seat (6) is closely arranged at the bottom of the inner cavity of the metal valve body (1); the top of the metal valve body (1) is connected to an upper valve cover (10) by bolts; a packing (11) is arranged inside the top of the upper valve cover (10) and is pressed tightly by a packing gland (12); a ceramic valve body lining (7) is attached to the inner wall of the inner cavity of the metal valve body (1); a ceramic pipe (2) is arranged on the inner wall of the single-sided medium inlet of the metal valve body (1); a ceramic diffusion section (8) is arranged on the inner wall of the bottom medium outlet of the metal valve body (1); the top of the ceramic valve core (9) extends above the top of the single-sided medium inlet; a number of throttle holes are opened on the ceramic valve core (9); the medium flows through the throttle holes from the single-sided medium inlet, forms a counterflush in the cavity of the ceramic valve core (9), and then flows out from the bottom medium outlet; a sliding sleeve (4) is arranged above the ceramic valve core (9); a driving shaft (13) is arranged at the top of the sliding sleeve (4); the driving shaft (13) passes through the centers of the upper valve cover (10) and the packing gland (12) in sequence and is connected to a driving device; a sliding sleeve lining (5) is arranged inside the sliding sleeve (4); the inner hole of the sliding sleeve lining (5) is in contact and fit with the outer circle of the ceramic valve core (9), and can slide up and down along the outer circle of the ceramic valve core (9) under the drive of the driving device to change the area of contact between the throttle holes and the medium; when the sliding sleeve (4) moves to the lowest position, the sliding sleeve lining (5) is closely attached to the inclined surface on the ceramic valve seat (6) to achieve the cut-off and closing of the medium.

2. The ceramic throttle valve for gas production tree according to claim 1, characterized in that: The throttle holes on the ceramic valve core (9) adopt a symmetric hole-opening design.

3. The ceramic throttle valve for gas production tree according to claim 2, characterized in that: The bottom of the sliding sleeve lining (5) and the top of the ceramic valve seat (6) are respectively provided with wedge angles with the same angle adaptation.

4. The ceramic throttle valve for gas production tree according to claim 3, wherein The ceramic diffusion section (8) adopts a Venturi structure with a narrow upper part and a wide lower part.

5. The ceramic throttle valve for gas production tree according to claim 4, characterized in that, A graphite gasket (3) is arranged between the top of the metal valve body (1) and the upper valve cover (10).

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