Wear-resistant kelly cock valve

Abstract

The utility model belongs to the technical field of plug valves, and discloses a wear-resistant kelly cock valve which comprises a valve body, a cock body and a valve seat, a wear-resistant layer is arranged on the contact surface of the cock body and the valve seat, the wear-resistant layer is made of micro tungsten carbide-based composite materials, and a plurality of micro grooves are formed in the surface of the wear-resistant layer at equal intervals along the surface of the wear-resistant layer. The valve seat is of a split structure and is composed of a lower valve seat body and an upper valve seat body, the lower valve seat body and the upper valve seat body are installed on the valve body through connecting pieces, a silicon nitride ceramic coating is sprayed on the inner wall of the valve body, an elastic sealing ring is arranged on the contact face of the lower valve seat body and the upper valve seat body, and the sealing ring is made of fluororubber and graphite compounds. The upper valve seat is provided with fixing lugs which are integrally formed and symmetrically arranged. The connecting piece comprises connecting rods installed on the valve body and the fixing lugs and fastening caps installed on the connecting rods. Abrasion resistance of the plug valve can be improved conveniently, and abraded parts of the valve seat can be replaced independently and conveniently, so that maintenance time is shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of plug valve especially relates to a wear -resisting type kelly cock. BACKGROUND

[0002] The kelly cock is a common blowout preventer, in order to avoid the occurrence of blowout accident, the kelly cock is connected on the upper and lower ends of the kelly pipe, and the kelly cock is opened or closed by rotating 90 degrees with special wrench according to the indication.

[0003] The kelly cock is a key equipment in oil drilling operation, which is used for controlling the flow of drilling fluid and emergency shutdown, and the existing plug valve has the following problems:

[0004] 1) poor wear resistance: the valve core and valve seat are easily worn under the scouring of high sand content drilling fluid, resulting in sealing failure and frequent replacement;

[0005] 2) high replacement cost: the replacement cost of the traditional integral valve seat is high, and the integral valve seat needs to be disassembled and repaired, so the maintenance efficiency is low, therefore, the utility model provides a wear -resisting type kelly cock. CONTENT OF THE UTILITY MODEL

[0006] In view of the above problems of the existing plug valve, the utility model is provided.

[0007] Therefore, the utility model aims at providing a wear -resisting type kelly cock, which aims at: the combination of tungsten carbide wear -resisting layer and split type valve seat solves the problems of poor wear resistance and high replacement cost of the traditional plug valve.

[0008] To solve the above technical problems, the utility model provides the following technical scheme:

[0009] A wear -resisting type kelly cock, comprising a valve body, a plug body and a valve seat, the contact surface of the plug body and the valve seat is provided with a wear -resisting layer, the wear -resisting layer is micro tungsten carbide base composite material, the wear -resisting layer surface is provided with a plurality of micro grooves, and a plurality of micro grooves are equidistantly arranged along the surface of the wear -resisting layer.

[0010] The valve seat is a split type structure, the valve seat is composed of a lower valve seat and an upper valve seat, and the lower valve seat and the upper valve seat are installed on the valve body through a connecting piece.

[0011] As the technical scheme of the utility model, the inner wall of the valve body is sprayed with a silicon nitride ceramic coating.

[0012] As the utility model discloses a kind of wear-resistant type kelly cock valve, wherein: the contact surface of the lower valve seat and the upper valve seat is equipped with elastic sealing ring, and the material of the sealing ring is fluorine rubber and graphite compound.

[0013] As the utility model discloses a kind of wear-resistant type kelly cock valve, wherein: the upper valve seat has integrally formed and symmetrically arranged fixing lug, and the connecting piece includes the connecting rod installed on the valve body and the fixing lug and the fastening cap installed on the connecting rod.

[0014] As the utility model discloses a kind of wear-resistant type kelly cock valve, wherein: the outer surface of the valve body has integrally formed fixing edge, and the fixing edge is provided with threaded hole corresponding to the connecting rod, one end of the connecting rod is provided with lower thread matched with the threaded hole, and the connecting rod is installed on the fixing edge by the lower thread and the threaded hole.

[0015] As the utility model discloses a kind of wear-resistant type kelly cock valve, wherein: the fixing lug is provided with through hole corresponding to the connecting rod, and the connecting rod is inserted into the through hole, and the connecting rod is connected with the fastening cap.

[0016] As the utility model discloses a kind of wear-resistant type kelly cock valve, wherein: the outer surface of the connecting rod, which is extended out of the through hole, is provided with upper thread matched with the fastening cap, and the upper thread is connected with the fastening cap by screw thread.

[0017] As the utility model discloses a kind of wear-resistant type kelly cock valve, wherein: the pitch of the lower thread and the upper thread is different.

[0018] Compared with the prior art, the utility model has at least the following beneficial effects:

[0019] 1、The utility model discloses a tungsten carbide wear-resistant layer and a micro-groove are combined to enhance the oil storage capacity of the wear-resistant layer and reduce the friction heat, thereby improving the wear resistance of the cock valve.

[0020] 2、The utility model discloses a split type valve seat, which can replace the wear part separately and reduce the maintenance time.

[0021] 3、The utility model discloses an elastic sealing ring is arranged on the contact surface of the lower valve seat and the upper valve seat, and the material of the sealing ring is fluorine rubber and graphite compound, so as to ensure the sealing property of the connecting part of the lower valve seat and the upper valve seat. DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the premise that the technical scheme of the present application is not deviated.

[0023] Figure 1 It is a whole front view structural schematic diagram of the present application.

[0024] Figure 2 It is a whole bottom view structural schematic diagram of the present application.

[0025] Figure 3 It is an exploded structural schematic diagram of the present application. Figure 2 It is an enlarged structural schematic diagram of A in the middle.

[0026] Figure 4 It is an exploded structural schematic diagram of the present application.

[0027] Mark explanation:

[0028] In the drawing: 1, valve body; 101, fixed edge; 102, threaded hole; 201, wear-resistant layer; 202, micro groove; 31, lower valve seat; 32, upper valve seat; 321, fixed lug; 4, connecting rod; 401, lower thread; 402, upper thread; 5, fastening cap. Specific implementation

[0029] The technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0030] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture is changed, the directionality indications will also be changed accordingly.

[0031] Meanwhile, the meaning of "and / or" or "and / or" in the whole text is that three schemes are included. Taking "A and / or B" as an example, the A scheme, the B scheme, or the scheme of A and B being satisfied at the same time are included.

[0032] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0033] Referring to Figures 1-4 , a wear-resistant kelly cock valve is provided, which comprises a valve body 1, a plug body and a valve seat, the contact surface of the plug body and the valve seat is provided with a wear-resistant layer 201, the wear-resistant layer 201 is a micro-tungsten carbide-based composite material, a plurality of micro-grooves 202 are arranged on the surface of the wear-resistant layer 201, and the plurality of micro-grooves 202 are equidistantly arranged along the surface of the wear-resistant layer 201. In application, by arranging the wear-resistant layer 201 on the surface of the plug body, and arranging the micro-grooves 202 on the surface of the wear-resistant layer 201, the friction coefficient between the plug body and the valve seat can be reduced, and the wear resistance of the plug valve can be improved.

[0034] The valve seat is a split structure, and the valve seat is composed of a lower valve seat 31 and an upper valve seat 32. The lower valve seat 31 and the upper valve seat 32 are installed on the valve body 1 through a connecting piece, so that the worn parts of the valve seat can be replaced separately, thereby reducing the maintenance time.

[0035] Referring to Figures 1-4 , the inner wall of the valve body 1 is sprayed with a silicon nitride ceramic coating, so as to improve the thermal shock resistance of the valve body 1.

[0036] Referring to Figure 4 , the contact surface of the lower valve seat 31 and the upper valve seat 32 is provided with an elastic sealing ring, and the sealing ring is made of fluorine rubber and graphite compound, so as to ensure the sealing property of the connecting part of the lower valve seat 31 and the upper valve seat 32.

[0037] Referring to Figures 1-4 , the upper valve seat 32 has integrally formed and symmetrically arranged fixing ears 321, the connecting piece comprises a connecting rod 4 installed on the valve body 1 and the fixing ears 321, and a fastening cap 5 installed on the connecting rod 4, so as to install the valve seat on the valve body 1 by using the connecting piece.

[0038] Referring to Figure 1 , Figure 2 and Figure 4The outer surface of the valve body 1 is provided with a fixed edge 101, and the fixed edge 101 is provided with a threaded hole 102 corresponding to the connecting rod 4, one end of the connecting rod 4 is provided with a lower thread 401 matched with the threaded hole 102, and the connecting rod 4 is installed on the fixed edge 101 through the threaded cooperation of the lower thread 401 and the threaded hole 102, so that the connecting rod 4 is installed on the fixed edge 101 through the lower thread 401 and the threaded hole 102.

[0039] Referring to Figure 1 , Figure 2 and Figure 4 , the fixed lug 321 is provided with a through hole corresponding to the connecting rod 4, the connecting rod 4 is inserted into the through hole, and the protruding part is connected with the fastening cap 5, so that the connecting rod 4 is inserted and installed on the fixed lug 321.

[0040] Referring to Figure 1 , Figure 2 and Figure 4 , the outer surface of one end of the connecting rod 4 protruding from the through hole is provided with an upper thread 402 matched with the fastening cap 5, and the upper thread 402 is threadedly connected with the fastening cap 5, so that the fastening cap 5 is assembled on the connecting rod 4 and fits better.

[0041] Referring to Figure 1 , Figure 2 and Figure 4 Figure 1 Figure 2 Figure 4 , the pitches of the lower thread 401 and the upper thread 402 are different, so that the connecting rod 4 is correspondingly assembled.

[0042] The working principle of the utility model is as follows: when it is necessary to disassemble and replace the valve seat wear part, the screw fastening cap 5 is used, at this time, the fastening cap 5 is threadedly moved on the outer surface of the connecting rod 4 and moves away from the fixed lug 321, until the fastening cap 5 is disassembled, then the upper valve seat 32 and the lower valve seat 31 are taken out from the valve body 1, and the elastic sealing ring is taken out, then the valve seat wear part is replaced with a new one, and the valve seat wear part is reset, so that the valve seat wear part is conveniently replaced alone, and the maintenance time is reduced.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model and are not limited. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the utility model, and all should be covered in the scope of the claims of the utility model.

Claims

1. A wear resistant kelly cock valve comprising a valve body (1), a plug body and a valve seat, characterized in that: The contact surface of the plug body and the valve seat is provided with a wear-resistant layer (201), the wear-resistant layer (201) is a micro-carbide tungsten-based composite material, the surface of the wear-resistant layer (201) is provided with a plurality of micro-grooves (202), and the plurality of micro-grooves (202) are equidistantly arranged along the surface of the wear-resistant layer (201). The valve seat is of a split structure, and is composed of a lower valve seat (31) and an upper valve seat (32), and the lower valve seat (31) and the upper valve seat (32) are mounted on the valve body (1) through a connecting piece.

2. The abrasion resistant kelly cock valve of claim 1, wherein: The inner wall of the valve body (1) is sprayed with a silicon nitride ceramic coating.

3. The wear-resistant kelly cock valve of claim 1, wherein: The contact surface of the lower valve seat (31) and the upper valve seat (32) is provided with an elastic sealing ring, and the sealing ring is made of a fluorine rubber and graphite composite.

4. The wear-resistant kelly cock valve of claim 3, wherein: The upper valve seat (32) is provided with integrally formed and symmetrically arranged fixing lugs (321), the connecting piece includes a connecting rod (4) mounted on the valve body (1) and the fixing lugs (321) and a fastening cap (5) mounted on the connecting rod (4).

5. The wear-resistant kelly cock valve of claim 4, wherein: The outer surface of the valve body (1) is provided with integrally formed fixing edges (101), and the fixing edges (101) are provided with threaded holes (102) corresponding to the connecting rod (4), one end of the connecting rod (4) is provided with a lower thread (401) matched with the threaded holes (102), and the connecting rod (4) is mounted on the fixing edges (101) through the lower thread (401) and the threaded holes (102) in a threaded fit.

6. The wear-resistant kelly cock valve of claim 5, wherein: The fixing lugs (321) are provided with through holes corresponding to the connecting rod (4), the connecting rod (4) is inserted into the through holes, and the protruding part is connected with the fastening cap (5).

7. The wear-resistant kelly cock valve of claim 6, wherein: The outer surface of one end of the connecting rod (4) protruding out of the through hole is provided with an upper thread (402) matched with the fastening cap (5), and the upper thread (402) is connected with the fastening cap (5) in a threaded fit.

8. The wear-resistant kelly cock valve of claim 7, wherein: The pitch of the lower thread (401) and the upper thread (402) is different.

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