Split type hydraulic auxiliary sealing gate plate assembly for gate valve

Abstract

The utility model relates to the technical field of oil and gas exploitation, and discloses a split type hydraulic auxiliary sealing flashboard assembly for a gate valve, which comprises an upper valve rod, an outer flashboard, an inner flashboard and a lower valve rod, a combination body of the outer flashboard and the inner flashboard is of a cuboid structure, and a through circular fluid channel is arranged inside the combination body. T-shaped grooves are formed in the sides, close to the fluid channel, of the outer gate plate and the inner gate plate, the upper valve rod is installed in the T-shaped grooves, and a circular groove parallel to the fluid channel is formed in the outer gate plate. Aiming at the defects in the prior art, the split type gate plate structure is adopted, the adjustable hydraulic auxiliary seal is adopted, the gate plate can be conveniently installed when the gate valve is assembled, adjustable sealing pressure can be generated when the adjustable hydraulic auxiliary seal gate valve is used, and the adjustable hydraulic auxiliary seal gate valve has less switching torque and excellent sealing sand prevention performance. The problems that an existing flashboard switch is too large in torque and poor in sealing performance are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oil and natural gas exploitation, especially relates to a split type hydraulic auxiliary sealing gate plate assembly for gate valve. BACKGROUND

[0002] In the process of oil and natural gas exploitation, wellhead devices, oil (gas) tree devices, manifold devices and other equipment are needed, and the gate valve is an essential component of these devices. The core function of the gate valve is to cut off and seal the fluid in the system, and this function is mainly achieved by the gate plate. The sealing performance of the gate plate is crucial to the safety of personnel and property, smooth production and transportation.

[0003] The gate valve relies on the close fit between the gate plate and the valve seat to achieve sealing. The current common practice is to design a certain sealing pressure between the gate plate and the valve seat. However, the use effect of the valve designed in this way is generally unsatisfactory. If the sealing pressure is too high, it will cause difficulty in opening and closing the gate valve, and if the sealing pressure is too low, it will result in poor sealing effect of the gate valve, causing fluid and sand in it to enter the gate valve, which will cause problems such as incomplete opening and closing of the gate valve and reduced service life. Therefore, we propose a split type hydraulic auxiliary sealing gate plate assembly for gate valve. SUMMARY

[0004] The utility model aims at providing a split type hydraulic auxiliary sealing gate plate assembly for gate valve. In view of the deficiencies in the prior art, a split gate plate structure is adopted, and an adjustable hydraulic auxiliary sealing is used, which can facilitate the installation of the gate plate during the assembly of the gate valve and generate adjustable sealing pressure during use, thus having less opening and closing torque and superior sealing and sand prevention performance, solving the problems of excessive opening and closing torque and poor sealing performance of the existing gate plate.

[0005] The above technical purpose of the utility model is achieved by the following technical scheme: a split type hydraulic auxiliary sealing gate plate assembly for gate valve, comprising an upper valve stem, an outer gate plate, an inner gate plate and a lower valve stem, the combination of the outer gate plate and the inner gate plate is in a rectangular cuboid structure, and a through circular fluid passage is provided inside, the outer gate plate and the inner gate plate are provided with a T-shaped groove on the side close to the fluid passage, and the upper valve stem is installed inside the T-shaped groove.

[0006] By adopting the above technical scheme, the T-shaped groove structure is used for transmission, which can avoid the disadvantages of screw thread transmission such as easy deformation, easy jamming and easy pressure accumulation compared with screw thread transmission.

[0007] The further setting of the utility model is that the outer gate plate is internally provided with a circular groove parallel to the fluid channel, the inner gate plate is installed in the circular groove, a circular boss is arranged on the inner gate plate, a sealing groove is arranged on the circular boss, a first gate plate sealing piece and a second gate plate sealing piece are installed in the sealing groove, the first gate plate sealing piece and the second gate plate sealing piece are in contact with the inner wall of the circular groove on the outer gate plate, a gap space is formed between the outer gate plate and the inner gate plate, and the gap space is a hydraulic cavity.

[0008] By adopting the above technical scheme, dynamic sealing is formed, the pressure between the gate plate and the valve seat can be adjusted by adjusting the hydraulic pressure in the cavity, the sealing performance of the gate valve can be greatly improved, the mud and impurities contained in the fluid can be prevented from entering the gap between the gate plate and the valve seat, and the sealing surface is protected; meanwhile, the mud and impurities contained in the fluid can be prevented from entering the middle cavity of the gate valve, and the valve opening and closing is prevented from being stuck.

[0009] The further setting of the utility model is that a sand prevention ring is arranged between the outer gate plate and the inner gate plate.

[0010] By adopting the above technical scheme, the mud and impurities can be effectively prevented from entering the gap between the outer gate plate and the inner gate plate.

[0011] The further setting of the utility model is that the outer gate plate is provided with an outer gate plate oil injection channel connected with the hydraulic cavity on the side away from the fluid channel, a thread is arranged on the inner side of the outer gate plate oil injection channel, the lower valve rod is installed in the outer gate plate oil injection channel, a sealing groove is arranged on the lower valve rod, a lower valve rod outer sealing piece and a lower valve rod inner sealing piece are installed in the sealing groove, the lower valve rod outer sealing piece and the lower valve rod inner sealing piece are in contact with the inner wall of the outer gate plate oil injection channel of the outer gate plate, and a through lower valve rod oil injection channel is arranged in the lower valve rod.

[0012] By adopting the above technical scheme, a continuous oil injection channel is arranged in the gate plate assembly, and a sealing piece is arranged at the position where the oil injection channel is in communication with the outside, the sealing property of the oil injection channel can be effectively ensured, and the pressure maintenance of the hydraulic cavity and the cleanliness of the hydraulic oil can be effectively ensured.

[0013] The further setting of the utility model is that a connecting thread is arranged at the end of the lower valve rod oil injection channel away from the sealing groove.

[0014] By adopting the above technical scheme, the oil injection equipment is connected in use, the use is convenient, and the connection is reliable.

[0015] The utility model discloses beneficial effect is: the utility model discloses through adopting split type gate plate structure, set up the hydraulic cavity between outer gate plate and inner gate plate, and through adjustable hydraulic pressure, has reached both can conveniently install the gate plate when assembling the gate valve, can produce the good effect of adjustable sealing pressure when using, has improved the sealing performance of gate valve greatly, realized the balance between the appropriate opening and closing torque and superior sealing sand prevention performance. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will be to the embodiment description needed to use the drawing briefly introduced, obviously, the following description in the drawing is only some embodiments of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0017] Figure 1 It is the structure schematic diagram of the utility model as a whole.

[0018] Figure 2 It is the structure schematic diagram of the utility model Figure 1 in A-A direction section.

[0019] Figure 3 It is the structure schematic diagram of the utility model in gate plate part.

[0020] Figure 4 It is the structure schematic diagram of the utility model in lower valve stem part.

[0021] In the drawing, 1, upper valve stem;2.1, inner gate plate;2.2, first gate plate sealing piece;2.3, second gate plate sealing piece;2.4, sand prevention ring;2.5, outer gate plate;3.1, lower valve stem;3.2, lower valve stem outer sealing piece;3.3, lower valve stem inner sealing piece;

[0022] a, T-shaped groove;B, fluid passage;C, hydraulic cavity;D, outer gate plate oil injection channel;E, screw thread;F, lower valve stem oil injection channel;G, connecting screw thread. DETAILED DESCRIPTION

[0023] The technical scheme of the utility model will be described clearly and completely in conjunction with specific embodiments. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by the ordinary skilled person in the art without making creative labor belong to the scope of the utility model protection.

[0024] Please refer to Figures 1-4The utility model provides a technical scheme: a split type hydraulic auxiliary sealing gate plate assembly for gate valve technical scheme, including upper valve rod 1, outer gate plate 2.5, inner gate plate 2.1 and lower valve rod 3.1, the combination of outer gate plate 2.5 and inner gate plate 2.1 is rectangular parallelepiped structure, is provided with the through circular fluid passage b in the inside, upper valve rod 1, outer gate plate 2.5, inner gate plate 2.1 and lower valve rod 3.1 all adopt low alloy steel, stainless steel or corrosion -resistant alloy material, can satisfy the use condition under different working conditions.

[0025] As Figure 3 shown, the embodiment provides a split type hydraulic auxiliary sealing gate plate assembly for gate valve, and T-shaped groove a is arranged on one side of outer gate plate 2.5 and inner gate plate 2.1 close to fluid passage b, and upper valve rod 1 is installed in T-shaped groove a, adopts T-shaped groove structure to drive, compared with thread drive, the structure can avoid the disadvantages such as deformation of thread of thread drive, easy to jam and easy to store pressure.

[0026] As Figure 3 shown, the embodiment provides a split type hydraulic auxiliary sealing gate plate assembly for gate valve, and circular groove parallel to fluid passage b is arranged in the inside of outer gate plate 2.5, and inner gate plate 2.1 is installed in circular groove, and circular boss is arranged on inner gate plate 2.1, and sealing groove is arranged on circular boss, and first gate plate sealing piece 2.2 and second gate plate sealing piece 2.3 are installed in the inside of sealing groove, and first gate plate sealing piece 2.2 and second gate plate sealing piece 2.3 contact with the inner wall of circular groove on outer gate plate 2.5, to form dynamic sealing.

[0027] As Figure 3 shown, the embodiment provides a split type hydraulic auxiliary sealing gate plate assembly for gate valve, and gap space is formed between outer gate plate 2.5 and inner gate plate 2.1, and gap space is hydraulic cavity c, and the pressure between gate plate and valve seat can be adjusted by adjusting the hydraulic pressure in cavity, to greatly improve the sealing performance of gate valve.

[0028] As Figure 3 shown, the embodiment provides a split type hydraulic auxiliary sealing gate plate assembly for gate valve, and sand prevention ring 2.4 is arranged between outer gate plate 2.5 and inner gate plate 2.1, can effectively prevent mud and impurities from entering the gap between outer gate plate and inner gate plate, and the plane close to valve seat of outer gate plate 2.5 and inner gate plate 2.1 is specially treated, so that the gate plate is more wear -resisting and corrosion -resisting.

[0029] As Figure 3 , Figure 4As shown in the figure, the embodiment provides a split type hydraulic auxiliary sealing gate plate assembly for a gate valve, an outer gate plate 2.5 is provided with an outer gate plate oil injection channel d connected with the hydraulic cavity c on the side away from the fluid passage b, a thread e is arranged on the inner side of the outer gate plate oil injection channel d, and a lower valve rod 3.1 is installed in the outer gate plate oil injection channel;

[0030] As shown in the figure, Figure 4 As shown in the figure, the embodiment provides a split type hydraulic auxiliary sealing gate plate assembly for a gate valve, a sealing groove is arranged on the lower valve rod 3.1, a lower valve rod outer sealing element 3.2 and a lower valve rod inner sealing element 3.3 are installed in the sealing groove, the lower valve rod outer sealing element 3.2 and the lower valve rod inner sealing element 3.3 are in contact with the inner wall of the outer gate plate oil injection channel d of the outer gate plate 2.5 to form a static seal, a through lower valve rod oil injection channel f is arranged in the lower valve rod 3.1, and the lower valve rod outer sealing element 3.2 and the lower valve rod inner sealing element 3.3 adopt a composite sealing element structure, the surface structure adopts a fluorine rubber material, the performance of resisting sulfur and high pressure is improved, and the internal metal framework structure adopts a corrosion-resistant alloy material, the corrosion resistance is improved.

[0031] As shown in the figure, Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown in the figure, the embodiment provides a split type hydraulic auxiliary sealing gate plate assembly for a gate valve, a continuous oil injection channel is arranged in the gate plate, and a sealing element is arranged at a position where the oil injection channel is in communication with the outside, the sealing element is reasonably designed, the closed property of the oil injection channel can be effectively ensured, and the pressure maintenance of the hydraulic cavity and the cleanliness of the hydraulic oil can be effectively ensured.

[0032] As shown in the figure, Figure 4 As shown in the figure, the embodiment provides a split type hydraulic auxiliary sealing gate plate assembly for a gate valve, a lower valve rod oil injection channel f is provided with a connecting thread g at an end away from the sealing groove, and is connected with an oil injection device in use, which is convenient and reliable in connection.

[0033] Working principle: the utility model discloses a split gate structure is adopted, sets up the hydraulic cavity c between outer gate 2.5 and inner gate 2.1, and reaches good effect that can conveniently install the gate when assembling the gate valve and can produce adjustable sealing pressure when using through adjustable hydraulic pressure, greatly improves the sealing performance of the gate valve, the outer gate 2.5 and the inner gate 2.1 between being provided with sandproof ring 2.4, can effectively prevent the mud and impurities from entering the gap between the outer gate and the inner gate, realizes the balance between the appropriate opening and closing torque and the superior sealing sandproof performance, the gate is provided with continuous oil injection channel inside, and the oil injection channel is provided with the sealing member of reasonable design at the place of communicating with the outside, can effectively guarantee the closed nature in the oil injection channel, thereby can effectively guarantee the pressure maintenance of the hydraulic cavity and the cleanness of the hydraulic oil, the lower valve stem oil injection channel f is provided with connecting thread g at the end away from the sealing groove, is connected with the oil injection equipment in use, convenient to use, and reliable connection.

[0034] It should be noted that, in this document, the terms such as first and second are used merely to distinguish one entity or action from another, and do not necessarily require or imply that these entities or actions are in any way mutually exclusive or in any way in a subordinate relationship. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment, and the standard parts used in the present application can be purchased from the market, and can be customized according to the description and drawings, and the specific connection mode of each part adopts the mature conventional means in the prior art, and the mechanical, parts and equipment adopt the conventional type in the prior art, which will not be described in detail here.

[0035] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A split-type hydraulic auxiliary sealing gate assembly for a gate valve, comprising an upper valve stem (1), an outer gate (2.5), an inner gate (2.1), and a lower valve stem (3.1), characterized in that: The combination of the outer gate (2.5) and the inner gate (2.1) has a cuboid structure and a through circular fluid channel (b) inside. The outer gate (2.5) and the inner gate (2.1) have a T-shaped groove (a) on the side near the fluid channel (b), and the upper valve stem (1) is installed inside the T-shaped groove (a).

2. The split-type hydraulic auxiliary sealing gate assembly for a gate valve according to claim 1, characterized in that: The outer gate (2.5) has a circular groove parallel to the fluid channel (b) inside. The inner gate (2.1) is installed in the circular groove. The inner gate (2.1) has a circular boss. The circular boss has a sealing groove. The sealing groove has a first gate seal (2.2) and a second gate seal (2.3) installed inside. The first gate seal (2.2) and the second gate seal (2.3) are in contact with the inner wall of the circular groove on the outer gate (2.5).

3. The split-type hydraulic auxiliary sealing gate assembly for a gate valve according to claim 1, characterized in that: A gap space is formed between the outer gate (2.5) and the inner gate (2.1), and the gap space is a hydraulic chamber (c).

4. A split-type hydraulic auxiliary sealing gate assembly for a gate valve according to claim 1, characterized in that: A sand-proof ring (2.4) is provided between the outer gate (2.5) and the inner gate (2.1).

5. A split-type hydraulic auxiliary sealing gate assembly for a gate valve according to claim 3, characterized in that: The outer gate (2.5) has an outer gate oil injection channel (d) connected to the hydraulic chamber (c) on the side away from the fluid channel (b). The outer gate oil injection channel (d) has a thread (e) on the outside. The lower valve stem (3.1) is installed in the outer gate oil injection channel (d).

6. A split-type hydraulic auxiliary sealing gate assembly for a gate valve according to claim 5, characterized in that: The lower valve stem (3.1) is provided with a sealing groove, and an outer sealing element (3.2) and an inner sealing element (3.3) of the lower valve stem are installed inside the sealing groove. The outer sealing element (3.2) and the inner sealing element (3.3) of the lower valve stem are in contact with the inner wall of the outer gate oil injection channel (d) of the outer gate (2.5). The lower valve stem (3.1) is provided with a through lower valve stem oil injection channel (f), and the lower valve stem oil injection channel (f) is provided with a connecting thread (g) at the end away from the sealing groove.

Images