High-precision main shaft for petroleum and natural gas valve

Abstract

The utility model discloses a high-precision main shaft for a petroleum and natural gas valve, which relates to the technical field of valve shafts and comprises a main shaft body, two ends of the main shaft body are respectively provided with a first connecting end and a second connecting end, two sides of the first connecting end are provided with first plain end grooves, and two sides of the second connecting end are provided with second plain end grooves. An insertion part is arranged at the outer end of the second connecting end, flat grooves matched with the second flat grooves are formed in the two sides of the insertion part, and cross-shaped grooves are formed in the flat grooves; a plurality of sealing grooves are formed in the periphery of the main shaft body and used for installing sealing assemblies. The main shaft body is provided with the lubricating structure, the lubricating structure comprises an annular lubricating groove formed in the outer surface of the main shaft body, a centrifugal flow guide groove is further formed in the outer surface of the main shaft body, and the annular lubricating groove is communicated with the centrifugal flow guide groove, so that a lubricating agent flows along a specific path when the main shaft rotates, the service life is prolonged, and meanwhile friction is reduced; and the operation precision and reliability of the valve are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve shafts, and more specifically, to a high-precision main shaft for oil and gas valves. Background Art

[0002] In the oil and gas industry, as a key component, the performance of the valve main shaft directly affects the reliability and efficiency of the entire valve system. However, traditional valve main shafts face the following main challenges: in harsh environments such as high pressure, high temperature, and corrosive media, the surface of the main shaft is prone to wear, reducing the service life and increasing maintenance costs. At the same time, traditional lubrication methods often struggle to form a continuous and effective lubricating film at critical parts of the main shaft, further exacerbating the wear problem. Summary of the Utility Model

[0003] Aiming at the problems existing in the prior art, the purpose of the utility model is to provide a high-precision main shaft for oil and gas valves to solve the technical problems mentioned in the above background art.

[0004] To solve the above problems, the utility model adopts the following technical solutions:

[0005] A high-precision main shaft for oil and gas valves, comprising a main shaft body, and the main shaft body is a cylindrical structure extending axially;

[0006] Both ends of the main shaft body are respectively provided with a first connection end and a second connection end. The length of the first connection end is greater than that of the second connection end. First flat grooves are opened on both sides of the first connection end, second flat grooves are opened on both sides of the second connection end, an insertion part is provided at the outer end of the second connection end, flat grooves matching the second flat grooves are provided on both sides of the insertion part, and a "cross" groove is opened on the flat grooves. The insertion part is used to connect with the actuator;

[0007] A plurality of sealing grooves are opened on the outer periphery of the main shaft body, and the sealing grooves are used to install sealing components;

[0008] The main shaft body is provided with a lubrication structure. The lubrication structure includes an annular lubrication groove provided on the outer surface of the main shaft body. A centrifugal diversion groove is also opened on the outer surface of the main shaft body. The annular lubrication groove is communicated with the centrifugal diversion groove, so that the lubricant flows along a specific path when the main shaft rotates.

[0009] Preferably, it also includes a marking cone pit opened on the second connection end for marking the installation position and assisting in positioning. The diameter of the marking cone pit is 1.19 mm, and the chamfer angle is 118°.

[0010] Preferably, it further includes a plurality of axial positioning marks opened on the main shaft body, axially spaced along the outer circumferential surface of the main shaft body, for achieving rapid calibration and precise positioning.

[0011] Preferably, the surface of the main shaft body is coated with a wear-resistant coating, and the wear-resistant coating covers the outer circumferential surface of the main shaft body for improving the wear resistance.

[0012] Preferably, the main shaft body is made of 303 stainless steel or 316 stainless steel, and the main shaft body made of 316 stainless steel is applicable to high-corrosion environments.

[0013] Preferably, a through hole is provided at the axis of the main shaft body for assisting the circulation of gas or liquid.

[0014] Preferably, the diameter of the main shaft body is between 9.514 - 9.522 mm, and the surface roughness is below Ra0.025;

[0015] Preferably, the sealing assembly is an O-ring, a graphite ring or other seals.

[0016] Preferably, the cross-section of the annular lubricating groove is U-shaped, and the annular lubricating groove is provided with a plurality of concentric grooves, and the plurality of annular lubricating grooves are interconnected for increasing the lubricant storage and achieving segmented lubrication;

[0017] The width of the annular lubricating groove is between 1 / 20 - 1 / 10 of the diameter of the main shaft body 1, and the depth is between 1 / 2 - 2 / 3 of the width;

[0018] The centrifugal diversion groove is radially inclined and connected to the annular lubricating groove, facilitating the guiding and distribution of the lubricant to key parts during rotation.

[0019] Compared with the prior art, the advantages of the present utility model are as follows:

[0020] 1. The combination of high-precision machining and multiple surface treatments significantly improves the performance and service life of the main shaft. The dimensional accuracy of the main shaft body is controlled within ±0.003 mm, the cylindricity and roundness errors are controlled within 0.002 mm, and the surface roughness reaches below Ra0.025. Coupled with plasma nitriding and physical vapor deposition coating treatments, a nitrided layer of 50 - 100 μm and a titanium nitride coating of 2 - 3 μm are formed. This combination of precision machining and surface treatment greatly improves the wear resistance, corrosion resistance and sealing performance of the main shaft, extends the service life, reduces friction at the same time, and improves the operation accuracy and reliability of the valve.

[0021] 2. The lubrication structure significantly improves the lubrication effect of the main shaft. A plurality of concentric annular lubrication grooves provided on the outer surface of the main shaft body communicate with the centrifugal diversion grooves to form a complex lubrication system. This design not only increases the storage capacity of the lubricant but also utilizes the centrifugal force during the rotation of the main shaft to evenly distribute the lubricant along a specific path to key parts, achieving a better lubrication effect. The optimized lubrication effect further reduces friction and wear, improves the operating efficiency and service life of the main shaft, and also enhances the overall performance and reliability of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic three-dimensional structure of the present utility model Figure 1 ;

[0023] Figure 2 Schematic three-dimensional structure of the present utility model Figure 2 ;

[0024] Figure 3 Schematic side view structure diagram of the present utility model;

[0025] Figure 4 Schematic front view structure diagram of the present utility model;

[0026] Figure 5 Of the present utility model Figure 2 Enlarged structure diagram at position A in

[0027] Description of the reference numerals in the drawings:

[0028] 1. Main shaft body; 2. First connection end; 3. Second connection end; 4. First flat groove; 5. Second flat groove; 6. Insertion part; 7. Sealing groove; 8. Annular lubrication groove; 9. Centrifugal diversion groove; 10. Marking cone pit; 11. Positioning mark. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] Embodiment:

[0031] Please refer to Figures 1-5, A high-precision main shaft for oil and gas valves, including a main shaft body 1. The main shaft body 1 is a cylindrical structure extending axially. The diameter of the main shaft body 1 is between 9.514 - 9.522 mm. The dimensional accuracy of the main shaft body 1 is controlled within ±0.003 mm. The cylindricity and roundness errors are controlled within 0.002 mm. The surface roughness is below Ra0.025. The high-precision surface treatment can reduce friction and improve the sealing performance. The main shaft body 1 is made of high-strength and high-hardness alloy steel material, and during the processing, it undergoes treatment to remove sharp edges, corners, and burrs to avoid defects such as surface scratches, bruises, pulls, and pits. After processing, thermal aging treatment is carried out to eliminate residual stress and ensure dimensional stability and long-term reliability. The outer circular surface of the main shaft body 1 is processed by centerless grinding technology, and ultrasonic cleaning is used to remove surface residual impurities.

[0032] At both ends of the main shaft body 1, a first connection end 2 and a second connection end 3 are respectively provided. The length of the first connection end 2 is greater than that of the second connection end 3. The asymmetric design can adapt to different connection requirements and increase the applicability of the main shaft. On both sides of the first connection end 2, first flat slots 4 are provided. On both sides of the second connection end 3, second flat slots 5 are provided. At the outer end of the second connection end 3, an insertion part 6 is provided. On both sides of the insertion part 6, flat slots matching the second flat slots 5 are provided, and a "cross" slot is provided on the flat slots. The insertion part 6 is used to connect with the actuator;

[0033] On the outer circumference of the main shaft body 1, a plurality of sealing grooves 7 are provided. The sealing grooves 7 are used to install sealing components. The sealing components are O-rings, graphite rings, or other sealing parts. Other sealing parts can be mechanical seals, which can effectively prevent medium leakage, improve the sealing performance of the valve, and effectively prevent medium leakage, improve the sealing performance and safety of the valve;

[0034] The main shaft body 1 is provided with a lubrication structure. The lubrication structure includes an annular lubrication groove 8 provided on the outer surface of the main shaft body 1. On the outer surface of the main shaft body 1, a centrifugal diversion groove 9 is also provided. The annular lubrication groove 8 is connected to the centrifugal diversion groove 9, so that the lubricant flows along a specific path when the main shaft rotates.

[0035] The cross-section of the annular lubrication groove 8 is U-shaped, and the annular lubrication groove 8 is provided as a plurality of concentric grooves. The plurality of annular lubrication grooves 8 are connected to each other, which is used to increase the lubricant storage capacity and achieve segmented lubrication;

[0036] The width of the annular lubrication groove 8 is between 1 / 20 - 1 / 10 of the diameter of the main shaft body 1, and the depth is between 1 / 2 - 2 / 3 of the width; it can provide sufficient lubricant storage space without affecting the strength of the main shaft

[0037] The centrifugal diversion groove 9 is radially inclined and connected to the annular lubrication groove 8, facilitating the guiding and distribution of the lubricant to key parts during rotation, so as to achieve a better lubrication effect.

[0038] It also includes a marking cone pit 10 opened on the second connection end 3, which is used to identify the installation position and assist in positioning. The diameter of the marking cone pit 10 is 1.19 mm, and the chamfer angle is 118°.

[0039] It also includes a plurality of axial positioning marks 11 opened on the main shaft body 1, which are axially arranged at intervals along the outer circumferential surface of the main shaft body and are used to achieve rapid calibration and precise positioning.

[0040] The surface of the main shaft body 1 is coated with a wear-resistant coating, and the wear-resistant coating covers the outer circumferential surface of the main shaft body 1, which is used to improve the anti-wear performance. The surface of the main shaft body 1 is treated by plasma nitriding to form a nitriding layer with a thickness of 50 - 100 μm. Further, physical vapor deposition (PVD) technology is used on the nitriding layer to deposit a titanium nitride coating with a thickness of 2 - 3 μm, further enhancing the corrosion resistance and anti-friction performance.

[0041] The main shaft body 1 is made of 303 stainless steel or 316 stainless steel. Among them, the main shaft body 1 made of 316 stainless steel is suitable for high-corrosion environments.

[0042] A through hole is provided at the axis of the main shaft body 1, which is used to assist the flow of gas or liquid.

[0043] The processing of the main shaft body 1 adopts the following technological process:

[0044] (1) Rough machining: The rough machining of the shaft body is carried out by a CNC lathe, leaving a finishing allowance of 0.2 - 0.3 mm.

[0045] (2) Heat treatment: Quenching and tempering treatment is carried out to improve the material strength and hardness.

[0046] (3) Finishing: Grinding is carried out by a high-precision CNC grinding machine to control the cylindricity and roundness errors within 0.002 mm.

[0047] (4) Ultra-precision machining: Final machining is carried out using an ultra-precision grinding machine to make the surface roughness reach below Ra0.025.

[0048] (5) Surface treatment: Plasma nitriding and physical vapor deposition coating treatment are carried out.

[0049] Comprehensive performance tests are carried out on the processed main shaft, including:

[0050] A. Measurement of dimensional and shape accuracy: It is carried out using a coordinate measuring machine.

[0051] B. Surface roughness measurement: Measured using a surface roughness instrument.

[0052] C. Dynamic balance test: Conducted at three rotational speeds of 5000 rpm, 7500 rpm, and 10000 rpm.

[0053] D. Corrosion resistance test: Conducted a 360-hour salt spray test in a simulated oil and gas environment.

[0054] E. Wear resistance test: Conducted a continuous operation test for 10000 hours, and measured the wear amount every 1000 hours.

[0055] The above is only the preferred specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its improved concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. A high-precision spindle for petroleum and natural gas valves, characterized by: It comprises a main shaft body (1), wherein the main shaft body (1) is an axially extending cylindrical structure; The two ends of the main shaft body (1) are respectively provided with a first connecting end (2) and a second connecting end (3); the length of the first connecting end (2) is greater than the length of the second connecting end (3); first flat grooves (4) are provided on both sides of the first connecting end (2); second flat grooves (5) are provided on both sides of the second connecting end (3); an inserting portion (6) is provided at the outer end of the second connecting end (3); flat grooves matching the second flat grooves (5) are provided on both sides of the inserting portion (6); and a "cross" groove is provided on the flat groove; the inserting portion (6) is used for connecting to an actuator; A plurality of sealing grooves (7) are provided on the outer circumference of the main shaft body (1), and the sealing grooves (7) are used for installing sealing components; The spindle body (1) is provided with a lubrication structure, the lubrication structure comprising an annular lubrication groove (8) provided on the outer surface of the spindle body (1), a centrifugal guide groove (9) also being provided on the outer surface of the spindle body (1), the annular lubrication groove (8) being connected to the centrifugal guide groove (9), so that the lubricant flows along a specific path when the spindle rotates.

2. The high-precision spindle for petroleum and natural gas valves according to claim 1, characterized in that: It also includes a marking cone pit (10) formed on the second connection end (3) for marking the installation position and assisting in positioning, wherein the diameter of the marking cone pit (10) is 1.19 mm and the chamfer angle is 118°.

3. The high-precision spindle for petroleum and natural gas valves according to claim 1, characterized in that: It also includes a plurality of axial positioning marks (11) provided on the main shaft body (1), which are arranged at intervals along the outer circumferential surface of the main shaft body (1) in the axial direction, and are used to achieve rapid calibration and precise positioning.

4. The high-precision spindle for petroleum and natural gas valves according to claim 1, characterized in that: The surface of the main shaft body (1) is coated with a wear-resistant coating, and the wear-resistant coating covers the outer circumferential surface of the main shaft body (1) to improve the wear resistance.

5. The high-precision spindle for petroleum and natural gas valves according to claim 1, characterized in that: The main shaft body (1) is made of 303 stainless steel or 316 stainless steel, wherein the main shaft body (1) made of 316 stainless steel is suitable for highly corrosive environments.

6. The high-precision spindle for petroleum and natural gas valves according to claim 1, characterized in that: A through hole is provided at the axis center of the main shaft body (1) for assisting the circulation of gas or liquid.

7. The high-precision spindle for petroleum and natural gas valves according to claim 1, characterized in that: The main shaft body (1) has a diameter between 9.514 and 9.522 mm, and a surface roughness of less than Ra0.

025.

8. The high-precision spindle for petroleum and natural gas valves according to claim 1, characterized in that: The sealing component is an O-ring or a graphite ring.

9. The high-precision spindle for petroleum and natural gas valves according to claim 1, characterized in that: The cross section of the annular lubrication groove (8) is U-shaped, and the annular lubrication groove (8) is arranged as a plurality of concentric grooves, and the plurality of annular lubrication grooves (8) are interconnected, so as to increase the lubricant reserve and realize segmented lubrication; The width of the annular lubrication groove (8) is between 1 / 20 and 1 / 10 of the diameter of the main shaft body (1), and the depth is between 1 / 2 and 2 / 3 of the width; The centrifugal guide groove (9) is radially inclined and connected to the annular lubrication groove (8).

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