Corrosion-resistant long-acting rotary closed type double-control check valve

Abstract

The utility model relates to the technical field of control valves for fluid pipelines, in particular to a corrosion-resistant long-acting rotary-closing type double-control check valve which comprises a valve body, and two stages of check valve assemblies with the same opening direction are sequentially arranged in the valve body. The check valve assembly comprises a first support and a second support, a sliding rod is movably connected to the middle of the first support, a valve element is fixedly connected to the sliding rod, a valve port is formed in the valve body, the valve element can close the valve port in a one-way mode, the sliding rod is sleeved with a spring, and the spring deforms when the valve element is far away from the valve port. The check valve assembly further comprises a guide mechanism, the guide mechanism is arranged in the valve body, and the guide mechanism can enable the sliding rod to rotate while sliding relative to the first support. The double-control combined non-return valve is applied to the field of fluid pipelines for industrial production, aviation ships and urban construction, is of a double-control combined non-return structure, and can improve the effects of preventing reverse inrush flow and preventing leakage.

Description

Technical Field

[0001] This utility model relates to the field of control valve technology for fluid pipelines, specifically a corrosion-resistant, long-lasting, rotary closed-loop valve with dual control and single flow. Background Technology

[0002] Various types of check valves are installed on oil wells, production equipment, and pipelines in the petroleum, chemical, and refining industries. According to safety production management regulations, check valves used in pipelines handling high-temperature, high-pressure, and corrosive media must be of metal construction, meaning both the valve core and valve port are made of metal. Currently, most check valves close the valve port through a reciprocating axial motion, meaning the valve core impacts the valve port when it closes. Due to the high pressure within the pipeline, to reduce the deformation caused by the valve core impacting the valve port when closing, key structures of check valves are made of high-hardness metal materials. However, high-hardness metal materials are not corrosion-resistant; therefore, check valves will rust after a period of use, causing incomplete valve closure or even failure.

[0003] Furthermore, check valves used in pipelines handling corrosive media are fitted with corrosion-resistant plastic gaskets or soft seals using sealing rings. However, these non-metallic materials are susceptible to high temperatures and aging, and are easily damaged in media containing sand or other contaminants. Therefore, the gaskets or sealing rings have a short lifespan and require frequent replacement. These problems have long plagued production enterprises in the petroleum, chemical, and refining industries, not only affecting normal production but also posing numerous safety hazards. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a corrosion-resistant, long-lasting, closed-loop dual-control single-flow valve.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A corrosion-resistant, long-life, closed-loop dual-control single-flow valve includes a valve body, in which two single-flow valve assemblies with the same opening direction are sequentially arranged.

[0007] The one-way valve assembly includes a first bracket and a second bracket. A sliding rod is movably connected to the middle of the first bracket. A valve core is fixedly connected to the sliding rod. A valve port is provided inside the valve body. The valve core can close the valve port in one direction. A spring is sleeved on the outside of the sliding rod. The spring deforms when the valve core moves away from the valve port.

[0008] The single-flow valve assembly also includes a guide mechanism disposed within the valve body. The guide mechanism enables the sliding rod to rotate while sliding relative to the first support.

[0009] The utility model discloses a double -controlled combined check structure can improve the effect of preventing reverse inrush current and preventing leakage, in addition, the guiding mechanism of single -flow valve assembly can make the sliding rod and the valve core rotate simultaneously when the sliding rod drives the valve core to move and close the valve port, thereby when the valve core closes the valve port, the valve core gradually approaches the valve port in the mode of screw feed, direct impact of the valve core to the valve port is avoided, thereby avoiding the deformation of valve core and valve port, and for the medium of viscidity and containing sand, iron filings and turbid impurity, the valve core can utilize the characteristic of screw movement to push the medium and impurity at the valve port and close the valve port in the mode of playing shadow boxing, avoiding the hard impact of valve core and valve port and impurity simultaneously, and rotating and pushing out the impurity, the tightness of sealing is guaranteed.

[0010] The guiding mechanism comprises a spiral slide and a positioning pin, the positioning pin is in sliding fit with the spiral slide, the guiding mechanism further comprises a shaft sleeve, the shaft sleeve is fixedly connected to the second support, and the sliding rod is movably penetrated through the shaft sleeve.

[0011] The guiding mechanism of the two-stage single -flow valve assembly is identical, specifically:

[0012] The shaft sleeve is fixedly connected with the positioning pin inside, the spiral slide is arranged outside the sliding rod, and one end of the sliding rod provided with the spiral slide is movably arranged in the shaft sleeve.

[0013] The guiding mechanism of the two-stage single -flow valve assembly is different, specifically:

[0014] In the guiding mechanism of the first-stage single -flow valve assembly, the shaft sleeve is fixedly connected with the positioning pin inside, the spiral slide is arranged outside the sliding rod, and one end of the sliding rod provided with the spiral slide is movably arranged in the shaft sleeve;

[0015] In the guiding mechanism of the second-stage single -flow valve assembly, the shaft sleeve is provided with the spiral slide on the outer surface, the valve core is fixedly connected with the positioning pin through the guiding rod, and the sliding rod is movably penetrated through the shaft sleeve.

[0016] The adjusting nut is threadedly connected to the sliding rod, the damping pad is movably sleeved on the sliding rod, and the spring and the damping pad are located between the adjusting nut and the first support.

[0017] In order to be compact in structure, the second supports of the two-stage single -flow valve assemblies are arranged as one support, which is arranged between the first supports of the two-stage single -flow valve assemblies.

[0018] The inlet of the valve body is provided with a spherical structure of the flow divider cover. The flow divider cover can divide the incoming fluid, prevent the high-speed fluid from directly eroding the components in the valve body.

[0019] The first support comprises a first outer disc, a first connecting rod and a first inner disc, the first connecting rod is connected between the first outer disc and the first inner disc, a channel between the first outer disc and the first inner disc is arranged as a valve port, a guide hole is arranged at a center position of the first inner disc, and a sliding rod is movably penetrated through the guide hole.

[0020] The second support comprises a second outer disc, a second connecting rod and a second inner disc, the second connecting rod is connected between the second outer disc and the second inner disc, and an outer wall of the second outer disc is screwed on an inner wall of the valve body.

[0021] The first support and / or the second support are connected with the valve body in a threaded mode, so that the positions of the first support and / or the second support in the valve body can be adjusted, and the opening pressure of the check valve can be adjusted.

[0022] The valve body comprises a first shell and a second shell, the first shell and the second shell are connected in a detachable mode, and the two-stage check valve assemblies are arranged in the first shell and the second shell respectively.

[0023] The beneficial effects achieved by the utility model are as follows:

[0024] The utility model is applied to the field of fluid pipelines in industrial production, airships and urban construction, is a double-control combined check structure, and can improve the effects of preventing reverse gushing and leakage.

[0025] The utility model adopts a spiral motion mode to rotate the check valve, avoids impact when the valve core closes the valve port, avoids deformation to cause incomplete closing, and when the check valve is closed, the utility model can use the spiral rotation characteristics to push out the impurities and medium on the valve port in the way of shadowboxing, and close the valve port, so that leakage is avoided.

[0026] The utility model is provided with an adjusting nut and a damping pad, has the functions of limiting the opening size of the valve core, preventing the spring from being damaged by excessive compression and damping.

[0027] The utility model is provided with a flow distribution cover at the inlet of the check valve, can distribute the incoming fluid, and prevents high-speed fluid from directly eroding the internal control and movement components of the valve body.

[0028] The utility model discloses a valve body is made of stainless steel material, environmental protection corrosion -resistant, is applicable to the high temperature, high pressure, high corrosive environment of petroleum, chemical industry, refining etc. industry, also apply to biological pharmacy, medical health etc. environmental protection field, can also play the good check action to the muddy silt of various medium in the bad scene of viscous turbidity simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and serve to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0030] Figure 1 It is the structural schematic diagram of the utility model embodiment one, and the first support and the shaft sleeve are arranged on the valve body.

[0031] Figure 2 It is the structural schematic diagram of the utility model embodiment one (valve core open state).

[0032] Figure 3 It is the internal structure schematic diagram of the second support and the shaft sleeve in the utility model embodiment one.

[0033] Figure 4 It is the plan view of the second support in the utility model embodiment one.

[0034] Figure 5 It is the structural schematic diagram of the sliding rod and the valve core close to the valve body inlet end in the utility model embodiment one.

[0035] Figure 6 It is the structural schematic diagram of the sliding rod and the valve core far from the valve body inlet end in the utility model embodiment one.

[0036] Figure 7 It is the plan view of the first support in the utility model embodiment one.

[0037] Figure 8 It is the structural schematic diagram of the utility model embodiment two.

[0038] Figure 9 It is the structural schematic diagram of the utility model embodiment two (valve core open state).

[0039] Figure 10 It is the structural schematic diagram of the second support and the shaft sleeve in the utility model embodiment two.

[0040] Figure 11 It is the structural schematic diagram of the sliding rod and the valve core close to the valve body inlet end in the utility model embodiment two.

[0041] Figure 12 It is the application scene schematic diagram of the utility model applied to crude oil well mouth control device.

[0042] Figure 13 This is a schematic diagram of the application scenario of this utility model in a crude oil wellhead control device (with the first-stage single-flow valve assembly removed).

[0043] In the diagram: 1. Valve body; 101. First housing; 102. Second housing; 2. Second bracket; 201. Second outer disc; 202. Second connecting rod; 203. Second inner disc; 3. Positioning pin; 4. Spring; 5. Shock absorber; 6. First bracket; 601. First outer disc; 602. First connecting rod; 603. First inner disc; 604. Guide hole; 7. Valve core; 8. Diverter shroud; 9. Bushing; 10. Sliding rod; 11. Adjusting nut; 12. Spiral slide; 13. Guide rod; 14. Crude oil wellhead; 15. Three-way valve; 16. Integrated fluid control device; 17. Equipment. Detailed Implementation

[0044] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0045] Example 1: As Figures 1-7 As shown, a corrosion-resistant, long-life, rotary closed-loop double-control single-flow valve includes a valve body 1, in which two single-flow valve assemblies with the same opening direction are sequentially arranged.

[0046] The one-way valve assembly includes a first bracket 6 and a second bracket 2. A sliding rod 10 is movably connected to the middle of the first bracket 6. A valve core 7 is fixedly connected to the sliding rod 10. A valve port is provided inside the valve body 1. The valve core 7 can close the valve port in one direction. A spring 4 is sleeved on the outside of the sliding rod 10. The spring 4 deforms when the valve core 7 moves away from the valve port.

[0047] The single-flow valve assembly also includes a guide mechanism, which is disposed inside the valve body 1. The guide mechanism enables the sliding rod 10 to slide relative to the first bracket 6 while rotating.

[0048] This utility model is a dual-control combined check valve structure, which can improve the effect of preventing reverse flow and preventing leakage. In addition, the guide mechanism of the single-flow valve assembly can make the sliding rod 10 and the valve core 7 rotate simultaneously when the sliding rod 10 drives the valve core 7 to move and close the valve port. Thus, when the valve core 7 closes the valve port, the valve core 7 gradually approaches the valve port in a spiral feeding manner, avoiding the valve core 7 directly hitting the valve port, thereby avoiding deformation of the valve core 7 and the valve port. Furthermore, for viscous media and turbid impurities such as sand and iron filings, the valve core 7 can use its spiral movement characteristics to rotate and push the media and impurities at the valve port forward and close the valve port in a Tai Chi manner, avoiding hard impact between the valve core 7 and the valve port and the impurities, while rotating and pushing out the impurities, ensuring the tightness of the seal.

[0049] The guide mechanism comprises a spiral slide 12 and a positioning pin 3 which is in sliding fit with the spiral slide 12, and further comprises a shaft sleeve 9 which is fixedly connected to the second support 2, and a sliding rod 10 which is movably penetrated through the shaft sleeve 9.

[0050] The guide mechanism of the two-stage single-flow valve assembly is identical in structure, specifically, the shaft sleeve 9 is internally fixedly connected with the positioning pin 3, and the spiral slide 12 is arranged outside the sliding rod 10, and one end of the sliding rod 10 provided with the spiral slide 12 is movably arranged inside the shaft sleeve 9.

[0051] The positioning pin 3 is capable of extending outside the shaft sleeve 9 at one end; and the position of the sliding rod 10 provided with the spiral slide 12 can be different from the diameter of the main body of the sliding rod 10.

[0052] In order to achieve compact structure, the second support 2 of the two-stage single-flow valve assembly is arranged as one support which is arranged between the first supports 6 of the two-stage single-flow valve assembly, and the shaft sleeves 9 of the two-stage single-flow valve assembly are fixedly connected to the two sides of the support. On this basis, in order to ensure that the opening directions of the spools 7 of the two-stage single-flow valve assembly are identical, the spools 7 and the shaft sleeves 9 of the two-stage single-flow valve assembly are arranged at different positions relative to the first support 6, and the spool 7 and the shaft sleeve 9 of the single-flow valve assembly close to the inlet end of the valve body 1 are arranged on one side of the first support 6, while the spool 7 and the shaft sleeve 9 of the single-flow valve assembly away from the inlet end of the valve body 1 are arranged on both sides of the first support 6.

[0053] The sliding rod 10 is threadedly connected with an adjusting nut 11, and further movably sleeved with a shock pad 5, and the spring 4 and the shock pad 5 are located between the adjusting nut 11 and the first support 6, and the shock pad 5 is arranged close to the first support 6. The adjusting nut 11 can be used to adjust the opening pressure of the single-flow valve.

[0054] The valve body 1 is provided with a split cover 8 of spherical structure at the inlet. The split cover 8 is connected to the inside of the valve body 1 through a support structure similar to the second support 2, and is arranged close to the inlet end of the valve body 1. The split cover 8 protects the two-stage single-flow valve assembly.

[0055] The first bracket 6 includes a first outer disc 601, a first connecting rod 602, and a first inner disc 603. The first outer disc 601 and the first inner disc 603 are connected by the first connecting rod 602. The channel between the first outer disc 601 and the first inner disc 603 is configured as a valve port. A guide hole 604 is provided at the center of the first inner disc 603. The sliding rod 10 moves through the guide hole 604. The first outer disc 601 is fixedly connected to or threadedly connected to the inner wall of the valve body 1. Specifically, for the flow control assembly near the inlet end of the valve body 1, the first outer disc 601 of the first bracket 6 is fixedly connected to the inner wall of the valve body 1; while for the flow control assembly away from the inlet end of the valve body 1, the first outer disc 601 of the first bracket 6 is threadedly connected to the inner wall of the valve body 1.

[0056] The second bracket 2 includes a second outer disc 201, a second connecting rod 202 and a second inner disc 203. The second outer disc 201 and the second inner disc 203 are connected by the second connecting rod 202. The outer wall of the second outer disc 201 is screwed onto the inner wall of the valve body 1.

[0057] The valve body 1 includes a first housing 101 and a second housing 102, which are detachably connected. The two-stage single-flow valve assemblies are respectively disposed within the first housing 101 and the second housing 102. Specifically, the first housing 101 and the second housing 102 are connected by threads.

[0058] When specifically applied to crude oil wellhead control devices, such as Figure 12 , Figure 13 As shown, the crude oil wellhead control device is installed at the crude oil wellhead 14 in the oil field and is used in multiple scenarios. It is divided into upper and lower parts, and a dual-control check valve is installed between the upper and lower parts of the device.

[0059] Crude oil is extracted from the underground oil layer by the continuous up-and-down movement of a polished rod. The upward movement of the polished rod extracts the crude oil. This up-and-down movement is called an upstroke and a downstroke. The polished rod needs to pause between strokes, and normally it needs to perform 4-5 strokes per minute. Crude oil is extracted from the well during the upstroke, so the flow is intermittent. As the polished rod repeatedly performs these up-and-down strokes, the dual-control check valve installed on the wellhead control device also needs to be constantly opened and closed. Furthermore, crude oil is a mixture of three main media: oil, water, and gas. Gas can also cause the dual-control check valve to close, resulting in a very high switching frequency for the valve.

[0060] Because of the high pressure and large temperature difference of the oil well pipe, the crude oil contains sulfide, carbon dioxide and sand, and the production unit needs to add various chemical agents into the oil well due to the working condition requirements. Therefore, the check valve with soft sealing structure cannot be applied in this environment, and the check valve used in the oil field is currently a reciprocating axial movement hard sealing structure. Although the check valve used in the crude oil wellhead control device selects a high hardness metal, due to the high pressure of the oil well pipe and the high frequency of opening and closing, and the high hardness metal is not resistant to corrosion. The check valve used in the production pipeline will basically cause the valve core to deform and rust, resulting in incomplete closing or failure. In addition, the crude oil wellhead control device often needs to be applied in multiple scenes, and the upper port of the integrated fluid control device 16 needs to be opened. The pressure difference between the inlet and outlet of the double-control check valve will change from the small pressure difference of the same source fluid in the integrated fluid control device 16 to the large pressure difference between the pressure in the crude oil pipeline and the atmospheric pressure outside. At this time, the back pressure of the outlet of the double-control check valve becomes very large, and if the valve core has a slight deformation or rust, the crude oil will leak, causing a production safety accident.

[0061] In order to avoid safety hazards and not affect the normal production of the enterprise, the double-control check valve is designed as a combined detachable structure. This structure can switch the three-way valve 15 without affecting the production of crude oil, so that the primary check valve assembly of the double-control check valve can be removed without stopping production. The purpose of removing the primary check valve assembly is to regularly detect the primary check valve assembly to ensure that the quality is good and improve production safety.

[0062] The process of removing the primary check valve assembly without stopping production is as follows: first, switch the T-shaped three-way valve 15 of the crude oil wellhead control device to the lower flow state (as shown in Figure 13 ); remove the upper part of the integrated fluid control device 16 and the equipment 17; and then remove the check valve assembly at the upper end of the double-control check valve.

[0063] Another application scenario of the utility model is the application of the double-control check valve in the high-pressure plug injection pump in the oil field. Specifically, the crude oil in many blocks of the oil field is relatively viscous and needs to be injected into the underground with hot water. Since the oil layer is deep, a high-pressure plunger pump needs to be used. The currently used plunger pump has a pressure of 25-40mpa.

[0064] The working principle of the plunger pump is that the plunger pump chamber is provided with a fluid inlet and an outlet, and the inlet and the outlet are respectively provided with check valves in opposite directions. When the plunger pump works, the piston first sucks hot water into the chamber, at which time the check valve at the inlet is opened and the check valve at the outlet is closed. Then the plunger pump piston injects the hot water in the chamber into the underground oil layer, at which time the check valve at the outlet is opened and the check valve at the inlet is closed, and the cycle is repeated.

[0065] Piston pumps operate in high-temperature, high-pressure environments, and check valves typically employ hard-seal structures made of high-hardness metals. Due to the piston's continuous, rapid opening and closing, the deformation of the valve core and orifice under high-pressure impact causes leakage to begin within a short period. Furthermore, the constant and rapid erosion of the valve core and orifice by hot water causes scaling and corrosion, further hindering sealing and even leading to malfunction.

[0066] The use of this novel rotary closed-loop dual-control single-flow valve can effectively solve the above problems and effectively prevent leakage.

[0067] Example 2: Figures 8-11 As shown, this embodiment is basically the same as the first embodiment, except that the guide mechanism structure of the two-stage single-flow valve assembly is different. Specifically, in the guide mechanism of the first-stage single-flow valve assembly (away from the inlet end of the valve body 1), the bushing 9 is fixedly connected with a positioning pin 3, the spiral slide 12 is set outside the sliding rod 10, and one end of the sliding rod 10 with the spiral slide 12 is movably set inside the bushing 9.

[0068] In the guide mechanism of the other single-flow valve assembly (near the inlet end of valve body 1), a spiral slide 12 is provided on the outer surface of the bushing 9, and the valve core 7 is fixedly connected to the positioning pin 3 through the guide rod 13. The sliding rod 10 is movably installed through the bushing 9. The guide rod 13 and the positioning pin 3 can be configured as two symmetrical sets, and two sets of spiral slides 12 are also provided on the outer surface of the bushing 9 accordingly. The positioning pin 3 can slide along the corresponding spiral slide 12.

Claims

1. A corrosion resistant long-acting swing-to-close double-control uniflow valve, characterized by, Including valve body (1), valve body (1) inside is provided with two single valve assemblies of opening direction same in turn; The single valve assembly includes a first support (6), a second support (2), a sliding rod (10) movably connected to the middle of the first support (6), a valve core (7) fixedly connected to the sliding rod (10), a valve port provided in the valve body (1), the valve core (7) can one-way close the valve port, the outside of the sliding rod (10) is sleeved with a spring (4), the spring (4) is deformed when the valve core (7) is away from the valve port; The single valve assembly further includes a guide mechanism, the guide mechanism is arranged in the valve body (1), and the guide mechanism can make the sliding rod (10) slide relative to the first support (6) while rotating.

2. The corrosion resistant long-acting swing-to-close double-control one-way valve according to claim 1, wherein The guide mechanism includes a spiral slide (12) and a positioning pin (3), the positioning pin (3) is in sliding fit with the spiral slide (12), the guide mechanism further includes a shaft sleeve (9), the shaft sleeve (9) is fixedly connected to the second support (2), and the sliding rod (10) movably penetrates the shaft sleeve (9).

3. The corrosion resistant long-acting swing-to-close double-control one-way valve according to claim 2, wherein The guide mechanism structures of the two single valve assemblies are the same, specifically: The inside of the shaft sleeve (9) is fixedly connected with the positioning pin (3), the spiral slide (12) is arranged outside the sliding rod (10), and one end of the sliding rod (10) provided with the spiral slide (12) is movably arranged inside the shaft sleeve (9).

4. The corrosion resistant long-acting swing-to-close double control one-way valve according to claim 2, wherein The guide mechanism structures of the two single valve assemblies are different, specifically: In the guide mechanism of one single valve assembly, the inside of the shaft sleeve (9) is fixedly connected with the positioning pin (3), the spiral slide (12) is arranged outside the sliding rod (10), and one end of the sliding rod (10) provided with the spiral slide (12) is movably arranged inside the shaft sleeve (9); In the guide mechanism of another single valve assembly, the outer surface of the shaft sleeve (9) is provided with the spiral slide (12), the valve core (7) is fixedly connected with the positioning pin (3) through a guide rod (13), and the sliding rod (10) movably penetrates the shaft sleeve (9).

5. The corrosion resistant long-acting swing-to-close double-control uniflow valve according to claim 3 or 4, characterized in that, The adjusting nut (11) is threadedly connected to the sliding rod (10), the shock pad (5) is movably sleeved on the sliding rod (10), and the spring (4) and the shock pad (5) are located between the adjusting nut (11) and the first support (6).

6. The corrosion resistant long-acting swing-to-close double control one-way valve according to claim 1, wherein The second supports (2) of the two single valve assemblies are arranged as the same support, which is arranged between the first supports (6) of the two single valve assemblies.

7. The corrosion resistant long-acting swing-to-close double control one-way valve according to claim 1, wherein The inlet of the valve body (1) is provided with a flow divider cover (8) of spherical structure.

8. The corrosion resistant long-acting swing-to-close double control one-way valve according to claim 1, wherein The first support (6) includes a first outer disc (601), a first connecting rod (602) and a first inner disc (603), the first outer disc (601) and the first inner disc (603) are connected through the first connecting rod (602), the channel between the first outer disc (601) and the first inner disc (603) is arranged as a valve port, a guide hole (604) is arranged at the center position of the first inner disc (603), the sliding rod (10) movably penetrates the guide hole (604), and the first outer disc (601) is fixedly connected or threadedly connected with the inner wall of the valve body (1).

9. The corrosion resistant long-acting swing-to-close double control one-way valve according to claim 1, wherein The second support (2) comprises a second outer disc (201), a second connecting rod (202) and a second inner disc (203), the second outer disc (201) and the second inner disc (203) are connected through the second connecting rod (202), and the outer wall of the second outer disc (201) is screwed on the inner wall of the valve body (1).

10. The corrosion resistant long-acting swing-to-close double control one-way valve according to claim 1, wherein The valve body (1) comprises a first shell (101) and a second shell (102), the first shell (101) and the second shell (102) are connected in a detachable manner, and the two-stage single-flow valve assembly is arranged in the first shell (101) and the second shell (102) respectively.

Images