Sea valve of mud tank

Abstract

The utility model relates to the technical field of valves, in particular to a mud tank sea valve. Comprising a valve body, a valve seat is fixedly and hermetically connected in the valve body, a valve rod is fixed on a valve cover of the valve body, an inner sleeve is concentrically, fixedly and hermetically connected in the valve rod, a screw rod is concentrically and hermetically connected in the inner sleeve through threads, a step disc is concentrically and fixedly arranged at one end of the screw rod in the valve body, and a fixed disc is fixed on a valve core and located in a step hole of the fixed disc. A gap is formed between the outer edge of the small-diameter end of the stepped disc and the inner edge of the small hole of the stepped hole, a supporting rod is fixed in the valve body and makes contact with the valve seat, the valve seat is located between the supporting rod and the valve element, and a polished rod is concentrically fixed to the valve element, penetrates through the valve seat and the supporting rod and is in sliding connection with the supporting rod. According to the utility model, the valve core is connected with the screw rod by arranging the step disc and the fixed disc, and the step disc can slide in the step hole of the fixed disc, so that the assembly error of the screw rod and the valve core can be eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a subsea valve for a mud tank. Background Technique

[0002] During the process of oil drilling production, the main functions of the mud tank in the circulation system are to configure drilling fluid, circulate drilling fluid, store various drilling fluids with different performance requirements, and place solids control equipment, etc. The function of the drilling fluid is to clean the bottom of the well, carry cuttings, cool and lubricate the drill bit and drill string, balance the formation pressure, consolidate the wellbore, and transmit hydraulic power. Different performance drilling fluids in the mud tank are pumped into the drill string through the drilling pump and the circulation pipeline to complete the drilling fluid circulation process. Subsea valves are respectively installed at the bottom of the mud tank, and the subsea valves provide drilling fluid for the drilling pump, control the circulation pipeline of the drilling fluid, and the interval compartments. Usually, the mud tank is large in size and has a relatively high height.

[0003] Due to the height of the mud tank, the overall length of the valve body is usually long. When driving the valve body to open and close, the external force of the mud flow in the tank is very likely to impact the valve body, especially the spool part, causing the valve body to bend and the spool to deflect, thereby reducing the sealing effect of the valve body. At the same time, due to the overall length of the valve body, the manufacturing errors accumulate too much, affecting the sealing effect of the valve body on the orifice, and further increasing the difficulty of controlling the mud flow through the orifice of the entire mud tank.

[0004] The patent document with the application number CN201921744686.X discloses a subsea valve for a mud tank. A self-sealing device A and a self-sealing device B are arranged between the valve stem and the upper valve body of the subsea valve, which improves the overall sealing performance of the valve, and effectively prevents corrosive media such as mud in the deep-sea environment from entering the valve body as the valve stem moves up and down, thus effectively extending the overall service life of the valve. Since the valve stem is relatively long, the valve stem passes through the hole between the upper valve body flange and the lower valve body flange and the arranged guide cylinder, which can make the middle part of the valve stem obtain good positioning and ensure that the valve stem and the lower valve body are coaxial. However, this subsea valve still has the problem that the external force of the mud flow in the tank is very likely to impact the spool, causing the spool to deflect, and then reducing the sealing effect.

[0005] The patent document with the application number CN202121796779.4 discloses a subsea valve for a solids control system mud tank. The support device of the subsea valve can support the rod part suspended in the valve body and simultaneously support the sealing plate, so that both can withstand the external force of the unidirectional impact of the fluid, avoiding the bending of the rod end and the skew of the sealing plate, and ensuring the sealing effect of the flow inlet. The spherical mechanism enables the sealing plate to rotate arbitrarily in space, eliminating the manufacturing error between it and the flow inlet port, and fitting on the port of the flow inlet with a high degree of fit, not only improving the sealing effect, but also avoiding the drawback of eccentric wear of the sealing plate and increasing its service life. However, during the mud flow process, the horizontal support rod for stabilizing the rod will be impacted, easily causing the horizontal support rod to bend, and then unable to effectively support and stabilize the rod. When the mud impacts the sealing plate, since the sealing plate and the rod are movably connected through a hemispherical support shell and a rotating sphere, when the mud impacts the sealing plate, the sealing plate is prone to skew. When the valve needs to be closed, the sealing plate needs to rotate before it can be sealed and fitted with the flow inlet. During the valve closing process, the sealing plate and the flow inlet will have sliding contact, so the wear degree between the sealing plate and the flow inlet is large, and the problem of sealing aging is likely to occur. Utility Model Content

[0006] The technical problem to be solved by the present utility model lies in a subsea valve for a mud tank with good sealing performance, capable of improving the sealing aging, capable of eliminating the manufacturing error between the valve core and the valve seat, and with strong impact resistance of the valve core.

[0007] In order to achieve the above object, the technical solution provided by the present utility model is:

[0008] A subsea valve for a mud tank, including a valve body, a valve seat is fixedly and sealingly connected inside the valve body, a valve rod is fixed on the valve cover of the valve body, an inner sleeve is concentrically and fixedly and sealingly connected inside the valve rod, the inner sleeve extends into the valve body after passing through the valve cover, a screw rod is concentrically and threadedly and sealingly connected inside the inner sleeve, the screw rod penetrates the inner sleeve, one end of the screw rod inside the valve body is concentrically fixed with a stepped disc, a valve core concentric with the valve seat is arranged inside the valve body, a fixed disc is fixed on the valve core, a stepped hole is opened on the fixed disc, the large-diameter end of the stepped disc is slidably clamped inside the large hole of the stepped hole, the small-diameter end of the stepped disc penetrates the small hole of the stepped hole, and a gap is arranged between the outer edge of the small-diameter end of the stepped disc and the inner edge of the small hole of the stepped hole. A support rod is fixed inside the valve body, the support rod contacts the valve seat, the valve seat is located between the support rod and the valve core, a smooth rod is concentrically fixed on the valve core, the smooth rod penetrates the valve seat and the support rod, and the smooth rod is slidably connected with the support rod. A support rod is fixed inside the valve body, and a part of the inner sleeve inside the valve body penetrates the hole on the support rod.

[0009] Specifically, the support rod is perpendicular to the inner sleeve.

[0010] Specifically, a handwheel is fixed at one end of the screw rod outside the valve body.

[0011] Specifically, one end of the supporting rod facing away from the mud flow direction is a tip.

[0012] Specifically, a sleeve is fixed on the supporting rod, the axial direction of the sleeve is parallel to the movement direction of the valve core, and a plug rod is slidably inserted into the sleeve, and the plug rod is fixedly connected to the valve core.

[0013] Specifically, the small-diameter end of the stepped disc is fixedly connected to the screw rod, a lead screw is concentrically fixed on the small-diameter end of the stepped disc, the lead screw is threadedly connected to the screw rod, and the thread direction of the lead screw is opposite to the thread direction of the screw rod.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. The present utility model connects the valve core and the screw rod by arranging the stepped disc and the fixed disc. The stepped disc can slide in the stepped hole of the fixed disc, and the assembly error between the screw rod and the valve core can be eliminated.

[0016] 2. When the valve core moves, it is always concentric with the valve seat, which can ensure the effective sealing between the valve core and the valve seat.

[0017] 3. The cooperation between the sleeve and the plug rod can effectively improve the stability of the valve core during movement, and at the same time can improve the impact resistance of the valve core.

[0018] 4. The supporting rod can effectively stabilize the inner sleeve part in the valve body, and can prevent the screw rod and the inner sleeve part in the valve body from being deformed by the impact of the mud. Description of the Drawings

[0019] Figure 1 is a cross-sectional view of the present utility model.

[0020] Figure 2 is Figure 1 the enlarged view of area A in

[0021] Figure 3 the schematic diagram after the valve core and the valve seat are sealed and connected.

[0022] The part names in the drawings are:

[0023] 1 valve body

[0024] 2 valve rod

[0025] 3 inner sleeve

[0026] 4 screw rod

[0027] 5 handwheel

[0028] 6 supporting rod

[0029] 7 sleeve

[0030] 8 Insert rod

[0031] 9 Step Plate

[0032] 10 Fixed plate

[0033] 11 Valve core

[0034] 12 Valve seat

[0035] 13 Support rod

[0036] 14 Bare. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0038] Example 1: Reference Figures 1 - 3 As shown, a mud tank seabed valve comprises a valve body 1, a valve seat 12 is fixedly and sealedly connected inside the valve body 1, a valve stem 2 is fixedly connected to the valve cover of the valve body 1, an inner sleeve 3 is concentrically and fixedly sealedly connected inside the valve stem 2, the inner sleeve 3 penetrates the valve cover and extends into the valve body 1, a screw 4 is coaxially threadedly and sealedly connected inside the inner sleeve 3, and the screw 4 penetrates the inner sleeve 3.

[0039] A hand wheel 5 is fixed to one end of the screw rod 4 outside the valve body 1 .

[0040] A step plate 9 is fixed concentrically to one end of the screw rod 4 in the valve body 1. A valve core 11 concentric with the valve seat 12 is provided in the valve body 1, and a fixed plate 10 is fixed on the valve core 11. A stepped hole is provided on the fixed plate 10, and the large diameter end of the step plate 9 is slidably engaged in the large hole of the stepped hole, and the small diameter end of the step plate 9 passes through the small hole of the stepped hole, and a gap is provided between the outer edge of the small diameter end of the step plate 9 and the inner edge of the small hole of the stepped hole.

[0041] Specifically, the small diameter end of the step plate 9 is fixedly connected to the screw rod 4. A screw rod is coaxially fixed to the small diameter end of the step plate 9, and the screw rod is threadedly connected to the screw rod 4, and the thread direction of the screw rod is opposite to that of the screw rod 4.

[0042] A support rod 13 is fixed in the valve body 1, and the end of the support rod 13 that is away from the mud flow direction is a tip. By setting the end of the support rod 13 that is away from the mud flow direction as a tip, the resistance of the support rod 13 to the mud can be reduced. The support rod 13 contacts the valve seat 12, and the valve seat 12 is located between the support rod 13 and the valve core 11. A polished rod 14 is concentrically fixed on the valve core 11, and the polished rod 14 passes through the valve seat 12 and the support rod 13, and the polished rod 14 is slidably connected to the support rod 13.

[0043] A support rod 6 is fixed inside the valve body 1, and a part of the inner sleeve 3 inside the valve body 1 penetrates through the hole on the support rod 6. The support rod 6 is perpendicular to the inner sleeve 3.

[0044] During the rotation of the screw rod 4, it can drive the stepped disk 9 to rotate. While the screw rod 4 rotates, it can drive the stepped disk 9, the fixed disk 10, and the valve core 11 to move along the axial direction of the screw rod 4.

[0045] Since the large-diameter end of the stepped disk 9 is slidably clamped in the large hole of the stepped hole, the small-diameter end of the stepped disk 9 penetrates through the small hole of the stepped hole, and a gap is provided between the outer edge of the small-diameter end of the stepped disk 9 and the inner edge of the small hole of the stepped hole. Therefore, the stepped disk 9 can slide in the stepped hole of the fixed disk 10. When the valve core 11 is connected to the screw rod 4, the assembly error between the valve core 11 and the screw rod 4 can be eliminated. After the screw rod 4 is connected to the valve core 11, it can ensure that the valve core 11 is concentric with the valve seat 12.

[0046] The valve core 11 is slidably connected to the support rod 13 through a smooth rod 14. During the movement of the valve core 11, it always remains concentric with the valve seat 12. After the valve core 11 is in sealing contact with the valve seat 12, the sealing performance can be improved.

[0047] The support rod 6 can support a part of the inner sleeve 3 inside the valve body 1. At the same time, the cooperation between the smooth rod 14 and the support rod 13 can support the valve core 11, and can prevent the parts of the screw rod 4 and the inner sleeve 3 inside the valve body 1 from deforming under the impact of the mud.

[0048] During assembly, first fix the support rod 13 inside the valve body 1, and then fix the valve seat 12 inside the valve body 1. Then put the valve core 11 into the valve body 1 and make the smooth rod 14 penetrate through the valve seat 12 and the support rod 13. At this time, the stepped disk 9 is located in the stepped hole of the fixed disk 10, and then fix the support rod 6 inside the valve body 1. After the support rod 6 is fixed inside the valve body 1, make the inner sleeve 3 penetrate through the hole on the support rod 6. At this time, the screw rod 4 is located in the inner sleeve 3. Adjust the position of the stepped disk 9 in the stepped hole of the fixed disk 10 so that the lead screw is threadedly connected to the screw rod 4, and then complete the fixed connection between the stepped disk 9 and the screw rod 4. Then make the inner sleeve 3 penetrate through the valve cover and the valve rod 2, fix and seal the connection between the valve cover and the valve body 1, and make the valve rod 2 fixedly and sealedly connected to the inner sleeve 3. Finally, install the handwheel 5 on the screw rod 4.

[0049] Embodiment 2: On the basis of Embodiment 1, with reference to Figures 1 - 3 As shown, a sleeve 7 is fixed on the support rod 6. The axial direction of the sleeve 7 is parallel to the movement direction of the valve core 11. A plug rod 8 is slidably inserted into the sleeve 7, and the plug rod 8 is fixedly connected to the valve core 11.

[0050] The cooperation between the sleeve 7 and the plug rod 8 can effectively improve the stability of the valve core 11 during movement, and at the same time can improve the impact resistance of the valve core 11.

[0051] In this embodiment, during the valve assembly, after the valve core 11 is installed in the valve body 1, the support rod 6 and the sleeve 7 enter the valve body 1 together. At this time, the polished rod 14 is located inside the sleeve 7. After the lead screw is threadedly connected to the screw rod 4, the polished rod 14 is fixedly connected to the valve core 11. Then, the inner sleeve 3 penetrates through the valve cover and the valve stem 2, the valve cover is fixedly and sealingly connected to the valve body 1, and the valve stem 2 is fixedly and sealingly connected to the inner sleeve 3. Finally, the handwheel 5 is installed on the screw rod 4.

[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A mud tank submarine valve, comprising a valve body (1), a valve seat (12) fixedly and sealingly connected inside the valve body (1), a valve stem (2) fixed on a valve cover of the valve body (1), characterized in that: The valve stem (2) is coaxially fixedly sealed with an inner sleeve (3), which extends into the valve body (1) after penetrating the valve cover. The inner sleeve (3) is coaxially threadedly sealed with a screw rod (4), which penetrates the inner sleeve (3). A step disk (9) is coaxially fixed to one end of the screw rod (4) in the valve body (1). A valve core (11) concentric with the valve seat (12) is arranged in the valve body (1). A fixed disk (10) is fixed on the valve core (11). A stepped hole is provided on the fixed disk (10). The large diameter end of the step disk (9) is slidably engaged in the large hole of the step hole. The small diameter end of the step disk (9) is A small hole at one end of the step plate (9) passes through the stepped hole, a gap is provided between the outer edge of the small diameter end of the step plate (9) and the inner edge of the small hole of the stepped hole, a support rod (13) is fixed inside the valve body (1), the support rod (13) contacts the valve seat (12), the valve seat (12) is located between the support rod (13) and the valve core (11), a smooth rod (14) is concentrically fixed on the valve core (11), the smooth rod (14) passes through the valve seat (12) and the support rod (13), the smooth rod (14) and the support rod (13) are slidably connected, a support rod (6) is fixed inside the valve body (1), and a portion of the inner sleeve (3) inside the valve body (1) passes through the hole on the support rod (6).

2. A mud tank seabed valve according to claim 1, characterized in that: The support rod (6) is perpendicular to the inner sleeve (3).

3. A mud tank seabed valve according to claim 1, characterized in that: A hand wheel (5) is fixed to one end of the screw rod (4) outside the valve body (1).

4. A mud tank seabed valve according to claim 1, characterized in that: The end of the support rod (13) facing away from the mud flow direction is a tip.

5. A mud tank seabed valve according to claim 1, characterized in that: A sleeve (7) is fixed on the support rod (6), the axial direction of the sleeve (7) is parallel to the movement direction of the valve core (11), an insertion rod (8) is slidably inserted in the sleeve (7), and the insertion rod (8) is fixedly connected to the valve core (11).

6. A mud tank seabed valve according to claim 1, characterized in that: The small diameter end of the step plate (9) is fixedly connected to the screw rod (4), a screw rod is coaxially fixed to the small diameter end of the step plate (9), the screw rod is threadedly connected to the screw rod (4), and the thread direction of the screw rod is opposite to the thread direction of the screw rod (4).

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