A roll-pressed valve stem

Abstract

The utility model provides a kind of roll pressure valve stem, the utility model includes roll pressure thread section, tool withdrawal groove, valve stem main body, shaft shoulder and drive end, one end of valve stem main body is connected with roll pressure thread section by tool withdrawal groove, another end of valve stem main body is connected with drive end, roll pressure thread section is formed using cold roll pressure process, drive end surface is wedge, the right end of drive end is provided with internal hexagon recess, annular anti-loosening groove is opened in the end of roll pressure thread section away from tool withdrawal groove along circumference, annular anti-loosening groove is embedded with elastic lock washer, the inner wall of tool withdrawal groove is provided with labyrinth groove, the outer end surface of shaft shoulder is provided with annular sealing groove, double-layer composite sealing ring is arranged in annular sealing groove.The utility model can effectively resist thread loosening caused by vibration by the combination structure of annular anti-loosening groove and elastic lock washer;Rely on the double sealing design of double-layer composite sealing ring and tool withdrawal groove labyrinth groove, realize efficient sealing under multiple working conditions.

Description

Technical Field

[0001] This utility model relates to the field of valve stem technology, and in particular to a rolled valve stem. Background Technology

[0002] As the core transmission component of a valve, the valve stem is widely used in petrochemical, hydropower, metallurgy, and municipal pipeline networks. It plays a crucial role in transmitting opening and closing torque and controlling media flow, and its performance directly affects the valve's sealing reliability, operational flexibility, and service life. However, existing technologies suffer from limitations such as a single sealing structure, poor adaptability, and reliance on a single nut for tightening. In scenarios involving vibration in petrochemical pipelines or fluctuations in the operating conditions of hydropower equipment, the threads are prone to loosening, leading to decreased valve opening and closing accuracy and even media leakage, increasing safety risks. Therefore, we propose a rolled valve stem to address these issues. Utility Model Content

[0003] To address the shortcomings mentioned above, this utility model provides a rolled valve stem that effectively resists thread loosening caused by vibration through a combination of annular anti-loosening groove and elastic anti-loosening washer; and achieves high-efficiency sealing under multiple working conditions by relying on the dual sealing design of double-layer composite sealing ring and labyrinth groove with relief groove.

[0004] To solve the above problems, the technical solution provided by this utility model is as follows:

[0005] A rolled valve stem includes a rolled thread section, a relief groove, a valve stem body, a shoulder, and a drive end. One end of the valve stem body is connected to the rolled thread section via the relief groove, and the other end of the valve stem body is connected to the drive end. The rolled thread section is formed by cold rolling. The surface of the drive end is wedge-shaped, and an internal hexagonal groove is provided at the right end of the drive end. An annular anti-loosening groove is provided circumferentially at the end of the rolled thread section away from the relief groove. An elastic anti-loosening washer is embedded in the annular anti-loosening groove. A labyrinth groove is provided on the inner wall of the relief groove. An annular sealing groove is provided on the outer end face of the shoulder. A double-layer composite sealing ring is provided in the annular sealing groove.

[0006] Furthermore, the double-layer composite sealing ring includes an outer ring plate and an inner ring plate, with the inner ring plate embedded inside the outer ring plate.

[0007] Furthermore, the drive end is provided with mounting holes.

[0008] Furthermore, both of the elastic anti-loosening washers are made of stainless steel, and the cross-section of the elastic anti-loosening washers is Ω-shaped.

[0009] Furthermore, the outer ring plate is made of flexible graphite, the inner ring plate is made of fluororubber, and the inner diameter of the inner ring plate fits into the bottom of the annular sealing groove.

[0010] Furthermore, the end faces of the labyrinth groove and the unloading groove form a closed, sealed cavity.

[0011] Furthermore, the mounting hole is a through-hole, and the mounting hole is formed on the wedge-shaped surface of the drive end.

[0012] Furthermore, the valve stem body, the rolled thread section, the shoulder, and the drive end are integrally machined from 2Cr13 stainless steel.

[0013] Furthermore, the surface of the rolled thread section is phosphated.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. An Ω-shaped stainless steel elastic anti-loosening washer is embedded in the annular anti-loosening groove at the end of the rolled thread section. It can generate continuous pre-tightening force through elastic deformation, effectively resisting thread loosening caused by vibration, improving valve stem connection stability, and adapting to vibration conditions.

[0016] 2. The labyrinth groove on the inner wall of the relief groove forms a closed sealing cavity, which, together with the double-layer composite sealing ring of outer flexible graphite and inner fluororubber at the shaft shoulder, constitutes a double sealing structure, which can prevent media leakage and achieve high-efficiency sealing under multiple working conditions.

[0017] 3. The valve stem is integrally formed from 2Cr13 stainless steel. The rolled thread section is cold rolled and phosphated, which combines high strength and corrosion resistance. The double-layer composite sealing ring has strong material compatibility, which extends the service life of the valve stem and improves the sealing reliability.

[0018] In summary, this type of rolled valve stem has wide applicability, addressing the problems mentioned in the background section, such as the existing technology having a single sealing structure, poor adaptability, and relying on a single nut for locking. In scenarios such as vibration in petrochemical pipelines and fluctuations in the operating conditions of hydroelectric equipment, the threads are prone to loosening, leading to a decrease in valve opening and closing accuracy, and even causing media leakage, thus increasing the risk to safe production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the right-side structure of the drive end of this utility model.

[0021] Figure 3 This is a schematic diagram of the structure of the double-layer composite sealing ring of this utility model.

[0022] Figure 4 This is a side view of the elastic anti-loosening washer of this utility model.

[0023] Explanation of key component symbols:

[0024] 1-Rolled thread section, 2-Undrilled groove, 3-Valve stem body, 4-Shoulder, 5-Drive end, 6-Elastic anti-loosening washer, 7-Labyrinth groove, 8-Double-layer composite sealing ring, 801-Outer ring plate, 802-Inner ring plate, 9-Mounting hole, 10-Internal hexagonal groove. Detailed Implementation

[0025] To make the objectives, technical solutions and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and examples, but the examples given are not intended to limit the present utility model.

[0026] like Figures 1-4 As shown, the embodiment of this utility model includes a rolled thread section 1, a relief groove 2, a valve stem body 3, a shoulder 4, and a drive end 5. One end of the valve stem body 3 is connected to the rolled thread section 1 through the relief groove 2, and the other end of the valve stem body 3 is connected to the drive end 5.

[0027] The rolled thread section 1 is used to cooperate with the internal thread structure of the valve to realize opening and closing adjustment; the relief groove 2 is reserved space for thread machining and integrates sealing function; the valve stem body 3 is the core load-bearing component; the shoulder 4 is used for positioning and sealing; the drive end 5 is used to connect the drive mechanism to transmit torque.

[0028] The valve stem body 3, the rolled thread section 1, the shoulder 4 and the drive end 5 are integrally formed from 2Cr13 stainless steel. 2Cr13 stainless steel has good corrosion resistance, mechanical strength and processing performance, and can adapt to the erosion of the medium in the valve working environment. At the same time, it meets the structural stability requirements of integrated processing and avoids the problem of weak strength caused by segmented connection.

[0029] The rolled thread section 1 is formed using a cold rolling process. This process allows the thread metal fibers to remain continuous without being cut, significantly improving the thread's strength, wear resistance, and fatigue life. Simultaneously, it results in a lower thread surface roughness and higher mating precision. The surface of the rolled thread section 1 is treated with phosphate coating. This phosphate layer enhances the thread surface's wear resistance and corrosion resistance, while also improving lubrication during thread mating and reducing meshing wear.

[0030] An annular anti-loosening groove is formed circumferentially at the end of the rolled thread section 1 away from the relief groove 2, and an elastic anti-loosening washer 6 is embedded in the groove. The elastic anti-loosening washer 6 is made of stainless steel with an "Ω" shaped cross section, and has good elasticity and corrosion resistance. Two elastic anti-loosening washers 6 are embedded in the annular anti-loosening groove.

[0031] During assembly, the elastic anti-loosening washer 6 undergoes elastic deformation after thread engagement, tightly adhering to the annular anti-loosening groove and the end face of the valve's internal thread, generating a continuous axial preload force. This effectively prevents the valve stem from loosening during vibration or high-frequency operation, ensuring the stability of valve opening and closing.

[0032] The inner wall of the relief groove 2 is provided with a labyrinth groove 7, which forms a closed sealing cavity with the end face of the relief groove 2. This structure utilizes the labyrinth sealing principle to extend the leakage path of the medium. When the medium inside the valve attempts to penetrate through the thread gap, it must pass through multiple tortuous sealing cavities, effectively blocking the leakage of the medium and improving the sealing and protection performance of the valve stem. It is especially suitable for high-pressure or corrosive media conditions.

[0033] The outer end face of the shoulder 4 is provided with an annular sealing groove, in which a double-layer composite sealing ring 8 is installed for sealing the end faces of the valve stem and valve body. The double-layer composite sealing ring 8 includes an outer ring plate 801 and an inner ring plate 802. The inner ring plate 802 is embedded inside the outer ring plate 801, forming a double sealing protection. The outer ring plate 801 is made of flexible graphite material, which has excellent high temperature resistance, corrosion resistance and sealing performance, and can adapt to temperature fluctuations during valve operation, blocking most media penetration. The inner ring plate 802 is made of fluororubber material. Fluororubber has good elasticity and strong sealing fit. Its inner diameter fits tightly with the bottom of the annular sealing groove, further sealing possible leakage gaps. The double structure works together to improve sealing reliability and prevent media leakage from the shoulder end face.

[0034] The drive end 5 has a wedge-shaped surface, which facilitates its fit with the slot of the drive mechanism (such as a wrench or actuator), resulting in more even force distribution when transmitting torque and preventing slippage. The right end of the drive end 5 has an internal hexagonal groove 10, which can be used with an internal hexagonal wrench for manual operation, improving the convenience of assembly and maintenance. At the same time, the wedge-shaped surface of the drive end 5 has a through-hole mounting hole 9, which is used to insert a fixing pin or bolt to achieve a firm connection between the drive end 5 and the external drive mechanism and prevent relative displacement during transmission.

[0035] All electrical components mentioned in the text are electrically connected to an external controller and power supply, and the controller can be a conventional known device such as a computer that provides control.

[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rolled valve stem, comprising a rolled thread section (1), a relief groove (2), a valve stem body (3), a shoulder (4), and a drive end (5), wherein one end of the valve stem body (3) is connected to the rolled thread section (1) through the relief groove (2), and the other end of the valve stem body (3) is connected to the drive end (5), wherein the rolled thread section (1) is formed by cold rolling process, and the surface of the drive end (5) is wedge-shaped, characterized in that, The right end of the drive end (5) is provided with an internal hexagonal groove (10), the end of the rolled thread section (1) away from the relief groove (2) is provided with an annular anti-loosening groove along the circumference, the annular anti-loosening groove is provided with an elastic anti-loosening washer (6), the inner wall of the relief groove (2) is provided with a labyrinth groove (7), the outer end face of the shoulder (4) is provided with an annular sealing groove, and the annular sealing groove is provided with a double-layer composite sealing ring (8).

2. The roller-formed valve stem as described in claim 1, characterized in that, The double-layer composite sealing ring (8) includes an outer ring plate (801) and an inner ring plate (802), wherein the inner ring plate (802) is embedded inside the outer ring plate (801).

3. A rolled valve stem as described in claim 2, characterized in that, The drive end (5) is provided with a mounting hole (9).

4. A rolled valve stem as described in claim 3, characterized in that, The two elastic anti-loosening washers (6) are made of stainless steel, and the cross-section of the elastic anti-loosening washers (6) is "Ω" shaped.

5. A rolled valve stem as described in claim 4, characterized in that, The outer ring plate (801) is made of flexible graphite, and the inner ring plate (802) is made of fluororubber. The inner diameter of the inner ring plate (802) fits against the bottom of the annular sealing groove.

6. A rolled valve stem as described in claim 5, characterized in that, The labyrinth groove (7) and the end face of the retraction groove (2) form a closed sealed cavity.

7. A rolled valve stem as described in claim 6, characterized in that, The mounting hole (9) is a through-hole, and the mounting hole (9) is opened on the wedge-shaped surface of the drive end (5).

8. A rolled valve stem as described in claim 7, characterized in that, The valve stem body (3), the rolled thread section (1), the shoulder (4) and the drive end (5) are integrally formed from 2Cr13 stainless steel.

9. A rolled valve stem as described in claim 8, characterized in that, The surface of the rolled thread section (1) is phosphated.

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