Novel valve cover structure of general valve

Abstract

The utility model relates to the technical field of valve bonnets, in particular to a novel universal valve bonnet structure which comprises a valve bonnet, a copper sealing sleeve, a rotation stopping spring clamping ring and a fixing pin. Two 90-degree fan-shaped lugs corresponding to the fan-shaped grooves of the valve deck are symmetrically arranged on the outer wall of the copper sealing sleeve, an annular groove is machined in the upper edge of the valve deck, and the copper sealing sleeve is installed in the valve deck in the axial direction of the fan-shaped grooves of the valve deck through the fan-shaped lugs of the copper sealing sleeve. According to the structure, the reliability and the machining convenience of the sealing sleeve in the valve cover are improved, meanwhile, the product assembly process can be simpler, more convenient and faster, raw materials are saved, the machining procedure is simplified, and meanwhile the production cost is reduced. And the assembling time is reduced, so that the working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of valve cover technology, specifically a novel general-purpose valve cover structure. Background Technology

[0002] As is well known, in the field of general valve manufacturing, the fixation of the internal copper sealing sleeve of the valve cover has long relied on a combination structure of threaded connection and anti-rotation cap. Specifically, the traditional method requires machining a precision internal thread, typically a trapezoidal thread Tr40×7, on the inner wall of the valve cover, while simultaneously machining a matching external thread on the outer wall of the copper sealing sleeve. The two threads engage to resist the axial force acting on the copper sealing sleeve when the valve is opened and closed. To prevent the copper sealing sleeve from rotating with the valve stem, a copper cap with a reverse thread is added to the top of the copper sealing sleeve, relying on the friction generated by tightening the cap to achieve anti-rotation.

[0003] Traditional structures have significant drawbacks: low processing efficiency and high cost. Valve cover thread machining requires three processes: rough turning, semi-finish turning, and thread milling, accumulating 35 minutes. Due to the tendency for the internal thread to vibrate during machining, the pass rate is only 65%. Copper sealing sleeve thread machining requires two machines—a lathe and a dedicated threading machine—taking 28 minutes. The soft nature of copper causes thread deformation exceeding 20%. The anti-rotation cap requires additional turning, drilling, and tapping processes, increasing the total processing cost of a single component by 40%.

[0004] The axial load-bearing reliability is insufficient. Finite element analysis shows that the stress concentration at the root of the thread reaches 180MPa, which exceeds the yield strength of H62 brass of 140MPa, causing the risk of plastic deformation. When the measured peak axial impact force of valve opening and closing is 800N, the fretting wear of the thread pair leads to an increase in the mating clearance, and the axial movement reaches 0.5mm.

[0005] The anti-rotation mechanism has a high failure rate. During normal operation, when the pre-tightening force of the valve cap is less than 200N, the copper sleeve rotates at an angle exceeding 10°. After using a lever to operate the valve stem and make the torque exceed 70N·m, the friction is broken, causing the valve cap to loosen. Under temperature cycling, the difference in thermal expansion coefficients of copper and steel causes the pre-tightening force to decrease. After 200 opening and closing cycles, the anti-rotation failure rate reaches 100%. A maintenance report from a petrochemical company pointed out that 23% of the leakage failures of DN200 valves were caused by uneven wear of the sealing surface due to the rotation of the copper sealing sleeve.

[0006] The industry has attempted improvements, but with limited success. Adopting a flat key anti-rotation solution requires precision milling of the keyway, increasing processing costs by 30%, and the flat key is prone to shear breakage. While an integrated cast copper sleeve eliminates threads, maintenance requires replacing the entire valve cover, drastically increasing maintenance costs fivefold. In summary, traditional structures suffer from systemic defects in processing efficiency, axial strength, and anti-rotation stability; therefore, it is necessary to propose solutions to this technical problem. Utility Model Content

[0007] (a) Technical problems to be solved

[0008] To address the shortcomings of existing technologies, this utility model provides a novel universal valve cover structure.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, this utility model provides the following technical solution: a novel universal valve cover structure, comprising a valve cover, a copper sealing sleeve, an anti-rotation spring retainer, and a fixing pin. The valve cover has two symmetrically cast 90-degree fan-shaped grooves on its inner wall. The copper sealing sleeve has two symmetrically arranged 90-degree fan-shaped ears on its outer wall, corresponding to the fan-shaped grooves of the valve cover. An annular groove is machined along the upper edge of the valve cover. The copper sealing sleeve is axially inserted into the valve cover via its fan-shaped ears along the fan-shaped grooves. After rotating 90 degrees, the fan-shaped ears are embedded in the annular groove along the upper edge of the valve cover, thus achieving axial fixation of the copper sealing sleeve. The anti-rotation spring retainer is installed in a groove on the upper surface of the copper sealing sleeve, and the anti-rotation spring retainer has a 90-degree fan-shaped protrusion. This protrusion is embedded in any of the fan-shaped grooves of the valve cover, preventing the copper sealing sleeve from rotating.

[0011] Furthermore, the present invention is improved in that the outer diameter of the fan-shaped groove of the valve cover is larger than the outer diameter of the copper sealing sleeve and the fan-shaped ear.

[0012] Furthermore, the present invention is improved in that the height and width of the fan-shaped ears on the copper sealing sleeve match the size of the annular groove on the valve cover, so that there is no axial movement gap after the fan-shaped ears are embedded in the groove.

[0013] Furthermore, the present invention is improved in that the fan-shaped protrusion of the anti-rotation spring retainer matches the size of the fan-shaped groove of the valve cover, and the anti-rotation spring retainer limits the rotation of the copper sealing sleeve and the fan-shaped ear in the groove by limiting the fan-shaped groove.

[0014] Furthermore, the present invention is improved in that the fixing pin passes through the side wall of the valve cover and presses against the copper sealing sleeve, providing additional anti-rotation protection in large-diameter valves.

[0015] Furthermore, an improvement of this utility model is that the fixing pin is an internally threaded fixing pin.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, this utility model provides a novel universal valve cover structure, which has the following beneficial effects:

[0018] This new universal valve cover structure achieves a comprehensive breakthrough in processing efficiency, structural strength, and ease of maintenance through a grooved connection mechanism and a dual-mode anti-rotation design. In the processing stage, the 90-degree fan-shaped groove of the valve cover is directly cast, and only the upper annular groove needs to be machined. This greatly reduces the processing time of a single valve cover from that of the traditional threaded structure. The copper sealing sleeve adopts a one-time milling process to form a fan-shaped ear, replacing the original two processes of turning the outer circle and picking the thread. This reduces processing time and improves the pass rate. After the anti-rotation cap is eliminated from the overall assembly, the number of parts is reduced by one, and the cumulative processing cost is reduced.

[0019] The grooved connection increases the axial load capacity of the copper sealing sleeve from 800N to 1200N compared to traditional threads. Finite element analysis shows that the stress peak decreases from 180MPa to 75MPa, completely avoiding the risk of thread root fracture. The anti-rotation mechanism adopts a dual design of mechanical interlocking with snap rings and radial tightening with fixed pins. The anti-rotation torque jumps from 70N·m in the parallel cap friction mode to over 200N·m. The failure rate is zero after 2000 opening and closing cycles, especially achieving zero rotation under the working condition of large-diameter valve levers. The 90-degree fan-shaped ear design increases the force-bearing area compared to threaded connections, and the axial locking without gap characteristics formed by rotating 90° during assembly eliminate the 0.5mm axial movement of traditional structures.

[0020] The assembly process is simplified to three steps: axial insertion, 90° rotation to snap in, and pressing in the retaining ring. The time required for a single set is greatly reduced. The visual alignment design between the fan-shaped ears and the valve cover groove eliminates the need for special tools, improving the assembly error tolerance. When replacing the copper sealing sleeve during maintenance, there is no need to disassemble the threads. Simply pull out the retaining ring and rotate it 90° in the opposite direction to remove it. On-site maintenance time is shortened. Furthermore, large-diameter valves can be reinforced later by adding fixing pins, avoiding the need to replace the entire valve cover. Calculations based on large-scale production show that the annualized material cost is reduced at a scale of 10,000 sets, resulting in cost savings, extended service life, and a decrease in overall maintenance costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the exploded structure of this utility model;

[0022] Figure 2 This utility model Figure 1 Schematic diagram of the assembly structure of the middle valve cover;

[0023] Figure 3 This utility model Figure 1 A schematic diagram of the individual component structure of the middle valve cover;

[0024] Figure 4 This utility model Figure 1 Schematic diagram of the structure of the copper sealing sleeve;

[0025] Figure 5 This utility model Figure 1A schematic diagram of the structure of the stop spring retainer.

[0026] In the diagram: 1. Valve cover; 2. Copper sealing sleeve; 3. Anti-rotation spring retainer; 4. Fixing pin. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1 to 5 This utility model is a novel universal valve cover structure, including a valve cover 1, a copper sealing sleeve 2, an anti-rotation spring retainer 3, and a fixing pin 4. The inner wall of the valve cover 1 is symmetrically cast with two 90-degree fan-shaped grooves. The outer wall of the copper sealing sleeve 2 is symmetrically provided with two 90-degree fan-shaped ears corresponding to the fan-shaped grooves of the valve cover 1. The upper edge of the valve cover 1 is machined with an annular groove. The copper sealing sleeve 2 is axially inserted into the valve cover 1 through its fan-shaped ears along the fan-shaped grooves of the valve cover 1. After rotating 90 degrees, the fan-shaped ears are embedded in the annular groove on the upper edge of the valve cover 1, thereby fixing the copper sealing sleeve 2 axially. The anti-rotation spring retainer 3 is installed in a groove on the upper surface of the copper sealing sleeve 2, and the anti-rotation spring retainer 3 is provided with a 90-degree fan-shaped protrusion. This protrusion is embedded in any of the fan-shaped grooves of the valve cover 1, preventing the copper sealing sleeve 2 from rotating.

[0029] In this design, the outer diameter of the fan-shaped groove of the valve cover 1 is larger than the outer diameter of the copper sealing sleeve 2 and the fan-shaped lug. The height and width of the fan-shaped lug on the copper sealing sleeve 2 match the dimensions of the annular groove on the valve cover 1, ensuring that there is no axial movement clearance after the fan-shaped lug is embedded in the groove.

[0030] In this design, the fan-shaped protrusion of the anti-rotation spring retainer 3 matches the size of the fan-shaped groove of the valve cover 1. The anti-rotation spring retainer 3 limits the movement of the fan-shaped groove, preventing the copper sealing sleeve 2 and the fan-shaped ear from rotating within the groove.

[0031] In this design, the fixing pin 4 passes through the side wall of the valve cover 1 and presses against the copper sealing sleeve 2, providing additional anti-rotation protection in large-diameter valves.

[0032] In this design, the fixing pin 4 is an internally threaded fixing pin 4.

[0033] In this embodiment, the valve cover 1 has two 90-degree fan-shaped cast grooves, and the copper sealing sleeve 2 inside the valve cover 1 has two corresponding 90-degree fan-shaped ears. A machined groove is located on the upper edge of the valve cover 1, into which the two ears on the copper sealing sleeve 2 can be rotated. The anti-rotation spring retainer 3 prevents the copper sealing sleeve 2 from rotating with the valve stem during valve opening and closing. The fixing pin 4 provides more reliable performance for large-diameter valves, preventing the copper sealing sleeve 2 from rotating during valve operation. The copper sealing sleeve 2 with two 90-degree fan-shaped ears is placed into the valve cover 1 along the two 90-degree fan-shaped grooves cast inside the valve cover 1. After rotating 90 degrees, the two 90-degree fan-shaped ears of the copper sealing sleeve 2 are rotated into the groove machined on the upper edge of the valve cover 1. The 90-degree fan-shaped design is used, and the outer diameter of the two 90-degree fan-shaped grooves on the valve cover 1 is larger than the outer diameter of the 90-degree fan-shaped ears on the copper sealing sleeve 2. After the two 90-degree sector-shaped ears of the copper sealing sleeve 2 are inserted into the grooves on the valve cover 1, the copper sealing sleeve 2 is axially fixed. When the valve is operated, the axial force of the valve stem is transmitted to the sealing sleeve and then offset by the force of the two 90-degree sector-shaped ears on the copper sealing sleeve 2 in the grooves. The height and width of the two sector-shaped ears on the copper sealing sleeve 2 match the dimensions of the grooves machined on the valve cover 1, ensuring that there is no axial movement gap after the sector-shaped ears on the copper sealing sleeve 2 are inserted into the grooves, thus axially fixing the copper sealing sleeve 2. The two 90-degree sectors equally divide the circumference, maximizing the force-bearing area of ​​the sector under the same conditions, and also aiding in positioning during installation. After the two fan-shaped ears of the copper sealing sleeve 2 are rotated and engaged in the grooves machined along the upper edge of the valve cover 1, the anti-rotation spring retainer 3 is placed into the groove on the copper sealing sleeve 2. The 90-degree fan-shaped ring on the retainer is placed into either of the two fan-shaped grooves on the valve cover 1. The anti-rotation spring retainer 3 is fixed to the copper sealing sleeve 2 and also to the valve cover 1, thereby preventing the copper sealing sleeve 2 from rotating along with the valve stem. Since the outer diameter of the cast fan-shaped groove on the valve cover 1 is larger than the outer diameter of the fan-shaped ears on the copper sealing sleeve 2, and the 90-degree fan-shaped protrusion on the retainer matches the size of the fan-shaped groove on the valve cover 1, after the retainer is placed in it, the 90-degree fan shape on the retainer can prevent the two fan-shaped ears on the copper sealing sleeve 2 from rotating in the groove, thereby preventing the copper sleeve from rotating in the valve cover 1. The function of the retaining pin 4 is to provide additional limiting protection in large-diameter valves, where operators often use auxiliary tools such as levers to close the valve, thus applying excessive torque to the valve stem. Alternatively, when there are special requirements for valve reliability, the retaining pin 4 ensures that the copper sealing sleeve 2 does not rotate with the valve stem. The retaining pin 4 provides a very strong fixing effect, and its internal thread allows for easy disassembly.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel universal valve cover structure, characterized in that, The device includes a valve cover (1), a copper sealing sleeve (2), an anti-rotation spring retainer (3), and a fixing pin (4). The inner wall of the valve cover (1) is symmetrically cast with two 90-degree fan-shaped grooves. The outer wall of the copper sealing sleeve (2) is symmetrically provided with two 90-degree fan-shaped ears corresponding to the fan-shaped grooves of the valve cover (1). The upper edge of the valve cover (1) is machined with an annular groove. The copper sealing sleeve (2) is axially inserted into the valve cover (1) through its fan-shaped ears along the fan-shaped grooves of the valve cover (1). After rotating 90 degrees, the fan-shaped ears are embedded in the annular grooves on the upper edge of the valve cover (1), thereby fixing the copper sealing sleeve (2) axially. The anti-rotation spring retainer (3) is installed in the groove on the upper surface of the copper sealing sleeve (2), and the anti-rotation spring retainer (3) is provided with a 90-degree fan-shaped protrusion. The protrusion is embedded in any of the fan-shaped grooves of the valve cover (1) to prevent the copper sealing sleeve (2) from rotating.

2. The novel universal valve cover structure according to claim 1, characterized in that, The outer diameter of the fan-shaped groove of the valve cover (1) is larger than the outer diameter of the copper sealing sleeve (2) and the fan-shaped ear.

3. The novel universal valve cover structure according to claim 2, characterized in that, The height and width of the fan-shaped ears on the copper sealing sleeve (2) match the size of the annular groove on the valve cover (1), so that there is no axial movement gap after the fan-shaped ears are embedded in the groove.

4. The novel universal valve cover structure according to claim 1, characterized in that, The fan-shaped protrusion of the anti-rotation spring retainer (3) matches the size of the fan-shaped groove of the valve cover (1). The anti-rotation spring retainer (3) limits the movement of the fan-shaped groove to prevent the copper sealing sleeve (2) and the fan-shaped ear from rotating in the groove.

5. The novel universal valve cover structure according to claim 1, characterized in that, The fixing pin (4) passes through the side wall of the valve cover (1) and presses against the copper sealing sleeve (2) to provide additional anti-rotation protection in large-diameter valves.

6. The novel universal valve cover structure according to claim 1, characterized in that, The fixing pin (4) is an internal thread fixing pin (4).

Images