Built-in valve actuator head opening ring

Abstract

The utility model relates to a built-in valve actuator first opening ring which is applied to a valve actuator, rotates around a stroke column of the valve actuator and provides supporting force for the stroke column, and comprises a ring body which is sleeved on the stroke column and can rotate in a reciprocating mode in the circumferential direction, and a jacking block which is located on the top end face of the ring body and used for providing supporting force for the stroke column. The mounting extension block is positioned on the inner wall of the ring body; one end of the reset spring is connected to the mounting extension block, and the other end of the reset spring points to a base of the valve actuator; the plane where the deformation path of the reset spring is located is perpendicular to the motion path of the stroke column. The first open ring is additionally arranged on the base, the stroke column is supported by the first open ring, the axial thrust needing to be overcome by an operator during installation is weakened, and the operation difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field, and in particular to an open-loop built-in valve actuator. Background Technology

[0002] Valve actuators have internal compression springs, which typically have a large preload. In current technology, the preload is set to over 10 kg (industry standard). In addition, the preload of the valve core spring (usually over 4 kg) means that the axial thrust caused by the preload of both the actuator and the valve core spring must be overcome for proper installation.

[0003] The initial preload of the spring is 10+4kg. As the spring is compressed during installation, the force required for installation will increase linearly. After the actuator spring is compressed by 3mm, the force will increase by 18N and 1.8kg. The force required to install the valve will also increase linearly. Utility Model Content

[0004] In response to the shortcomings of the existing production technology, the applicant provides a structurally sound built-in valve actuator with a first-loop opening mechanism, thereby reducing resistance during initial installation and enabling repeated use.

[0005] The technical solution adopted in this utility model is as follows:

[0006] An integrated valve actuator with an open-loop mechanism is used in valve actuators to rotate around the actuator's stroke column, providing support for the stroke column.

[0007] The first loop includes:

[0008] The ring body, fitted onto the stroke column, can be circumferentially rotated back and forth.

[0009] The lifting block, located on the top end face of the ring, is used to provide support for the stroke column.

[0010] An extension block is installed on the inner wall of the ring; the extension block extends downwards beyond the bottom surface of the ring.

[0011] The return spring is connected at one end to the mounting extension block and at the other end to the base of the valve actuator; the plane of the deformation path of the return spring is perpendicular to the movement path of the stroke column.

[0012] As a further improvement to the above technical solution:

[0013] The ring is an open ring, and the central angle corresponding to the open part of the ring is smaller than the central angle corresponding to the part of the ring.

[0014] The return spring is located in the middle section of the ring.

[0015] The lifting block is arranged to extend upward perpendicularly to the ring body.

[0016] The height of the lifting block is less than the lifting limit height of the stroke column.

[0017] The top surface of the extension block is coplanar with the upper surface of the ring.

[0018] Mounting points are formed on the side wall of the mounting extension block, and one end of the return spring is sleeved on the mounting point.

[0019] The bottom of the mounting extension block rests within the groove structure on the valve actuator base.

[0020] The first ring is made of a single molded plastic part.

[0021] The beneficial effects of this utility model are as follows:

[0022] This application features a compact and reasonable structure, convenient operation, and reduces initial installation resistance. It solves the problem of existing electrothermal actuators requiring overcoming the combined 14kg axial installation resistance during initial installation due to the combined internal preload (10kg) and valve thrust (4kg). This ensures that the manual installation force meets the ASME B16.34 recommended range (≤8kg). By raising the initial contact position between the actuator and valve core by 4mm, the peak resistance during the initial installation stage is reduced from 14kg to 0kg. Since the force during the initial installation stage is minimal (10kg + 4kg), the force increases linearly as the spring is compressed. Reducing the initial force to 0kg significantly reduces the force required for subsequent valve installation.

[0023] The initial opening ring reset in this application is achieved with the assistance of an initial opening spring, making reset faster and more convenient.

[0024] This application also achieves reversibility of the drag reduction function, overcoming the defect of existing temporary drag reduction mechanisms that cannot be reset. It provides a control mechanism that can automatically fail after installation and can be repeatedly activated by mechanical or electrical signals, meeting the requirements for repeated installation after maintenance disassembly and system pressure testing (refer to GB / T 17446 Reliability Test Method for Sealing Elements). The initial opening ring can rotate clockwise and counterclockwise, and after completing the support action, it can be reset to the initial state, achieving the purpose of multiple reuses and supporting more than 50 repeated uses; the initial installation resistance deviation rate can still be maintained at <5% during repeated installation.

[0025] This application can reduce dynamic wear of the sealing surface, eliminate forced relative sliding between the actuator and the valve core sealing surface during installation, and reduce the O-ring wear rate to less than 1 / 3 of the conventional solution (refer to the ASTM D1414 standard test method).

[0026] This application improves structural compatibility, and without changing the interface size between the actuator and the manifold, it adapts to existing standard valve bodies while maintaining the original sealing performance (meeting the requirements of GB / T 13927 valve pressure test). Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the first open-loop application of the present invention in a valve actuator, with the outer casing hidden in the diagram.

[0028] Figure 2 This is a bottom view of a valve actuator with the first open loop of the present invention.

[0029] Figure 3 This is a schematic diagram of the first open-loop structure of the present invention.

[0030] Figure 4 This is a structural schematic diagram of the first open-loop part of the present invention from another perspective.

[0031] Figure 5 This is a schematic diagram of the first open-loop structure of the present invention without a return spring.

[0032] Figure 6 This is a schematic diagram of the first open-loop structure of the present invention without a return spring, from another perspective.

[0033] The components include: 1. Initial opening ring; 2. Base; 3. Stroke column; 4. Compression spring;

[0034] 101. Ring body; 102. Lifting block; 103. Return spring; 104. Stroke block; 105. Mounting point; 106. Ejector pin;

[0035] 201. Limiting reinforcement;

[0036] 301. Top block; 302. Rib plate. Detailed Implementation

[0037] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0038] like Figures 1-6 As shown, in this embodiment, the built-in valve actuator's first open ring 1 is applied to the valve actuator, rotating around the actuator's stroke column 3 and providing support force to the stroke column 3.

[0039] The first loop 1 includes:

[0040] The ring 101 is fitted onto the stroke column 3 and can be circumferentially reciprocated.

[0041] The lifting block 102, located on the top end face of the ring 101, is used to provide support for the stroke column 3.

[0042] Ejector pin 106 is located on the inner wall of ring 101; ejector pin 106 extends downward beyond the bottom end face of ring 101.

[0043] The return spring 103 points to the base 2 of the valve actuator; the plane on which the deformation path of the return spring 103 lies is perpendicular to the motion path of the stroke column 3.

[0044] The ring 101 is an open ring, and the central angle corresponding to the open part of the ring 101 is smaller than the central angle corresponding to the part of the ring 101.

[0045] The return spring 103 is located in the middle section of the ring 101.

[0046] The lifting block 102 is set to extend upward perpendicularly to the ring body 101.

[0047] The height of the lifting block 102 is less than the lifting limit height of the stroke column 3.

[0048] The top surface of the ejector pin 106 is coplanar with the upper end surface of the ring 101.

[0049] Mounting point 105 is formed on the side wall of ejector pin 106, and one end of return spring 103 is sleeved on mounting point 105.

[0050] The bottom end of the ejector pin 106 rests in the groove structure on the valve actuator base 2.

[0051] The first ring 1 is made of a single piece of molded plastic.

[0052] The specific structure and working process of this utility model are as follows:

[0053] The valve actuator has an internal compression spring 4, which typically has a large preload, sometimes reaching 10 kg in some existing technologies. Combined with the reaction force of the fluid in the valve core, this achieves the pressing of the sealing surface. Under this structure, the initial installation resistance is significant, being the sum of the preload and reaction force, requiring the overcoming of a large axial thrust during installation.

[0054] The high initial resistance is concentrated in the initial stage of installation. The first 3mm of stroke requires overcoming 90% of the resistance, making it difficult for operators to apply force. Moreover, the spring preload decreases significantly after repeated disassembly and assembly, resulting in a rapid decline in service life.

[0055] This application utilizes the elastic extension force generated by the compression spring 4 after compression, combined with the fixed-position support structure, to achieve the purpose of expanding the closing size; and through the thrust of the first opening spring, it generates the function of repeatedly setting the first installation position.

[0056] like Figure 1 and Figure 3As shown, this application adds a first opening ring 1 to the conventional actuator. The first opening ring 1 includes a ring body 101, and a protrusion is formed on the top surface of the ring body 101. This protrusion is the lifting block 102. Figure 5 and Figure 6 As shown, an mounting point 105 is formed on the inner wall of the ring 101, and a first-opening spring is sleeved on the mounting point 105; a stroke block 104 is formed on the outer wall of the ring 101. The thickness of the stroke block 104 is the same as the thickness of the ring 101. The stroke block 104 is equivalent to increasing the end face area at a certain position on the first-opening ring 1, so that the stroke block 104 can be set at this increased area and the bottom end of the stroke block 104 can be supported.

[0057] The function of the first ring 1 is to lift the stroke column 3. The outer circular outline of the stroke column 3 has a ring array of ribs 302 and top blocks 301. The protrusions on the first ring 1 are used to support the top blocks 301, which in turn support the top blocks 301 and the stroke column 3.

[0058] The first ring 1 is placed on the base 2, as follows Figure 1 As shown, the base 2 has a circumferentially formed limiting rib 201. One end of the limiting rib 201 pointing towards the center abuts against the first opening ring 1, thus limiting the first opening ring 1. The stroke block 104 on the first opening ring 1 falls between two adjacent limiting ribs 201. When the stroke block 104 rotates with the first opening ring 1, the movement path is the arc distance between the two adjacent limiting ribs 201, preventing the protrusion and the stroke column 3 from being difficult to align due to too large a rotation angle.

[0059] As an optimized implementation of this embodiment, the travel block 104 on the first open ring 1 is designed such that when the travel block 104 moves to the side limit rib 201, the protrusion can fall below the top block 301 of the travel column 3. The limit rib 201 also plays the role of assisting in positioning and facilitating accurate positioning.

[0060] The actuator in this embodiment works as follows:

[0061] Once the initial installation function is set up, the stroke column 3 will first rise by 4mm. This rising is existing technology, and the inventor will briefly explain it as follows:

[0062] During the production process, the actuator is inverted, and pressure is applied from top to bottom using a special fixture. The pressure acts on, for example, Figure 6 The actuator is positioned at the concave bottom, and the pressure displacement is 4mm, meaning the stroke column 3 is initially raised by 4mm. Simultaneously, the eccentric pin 106 with its ramp surface actuates the reset structure of the first opening ring 1, causing the first opening ring 1 to rotate to the desired position.

[0063] After the initial lifting is completed, the first opening ring 1 rotates to the expected angle. At this time, the protrusion of the first opening ring 1 is exactly below the top block 301, supporting the top block 301 and the stroke column 3. The compression spring 4 sleeved on the stroke column 3 is in a compressed state, and the reaction force of the compression spring 4 is applied to the stroke column 3 and the first opening ring 1. At this time, the stroke column 3 is raised by 4mm by the first opening ring 1.

[0064] When the actuator is powered on, the thermal expansion body built into the stroke column 3 expands due to heat, supporting the stroke column 3 to continue to rise. When the rising height is greater than 4mm, the pressure on the first opening ring 1 disappears. At this time, the restoring force of the first opening spring pushes the first opening ring 1 back to the initial position.

[0065] After the actuator is de-energized and the thermal tension body contracts, since the support of the first opening ring 1 is no longer available below the top block 301, the stroke column 3 is pushed completely to the bottom under the action of the compression spring 4, and the valve closes.

[0066] When the initial installation function needs to be reset, it can be done by pushing the stroke column 3 up by more than 4 mm from the bottom of the actuator, rotating the initial opening ring 1 to a fixed angle, and then removing the bottom thrust.

[0067] This application solves the problem of 14kg axial installation resistance caused by the superposition of the internal preload (10kg) and valve thrust (4kg) of existing electrothermal actuators during initial installation, making the manual installation force value conform to the recommended range of ASME B16.34 (≤8kg); and has the advantages of reversibility to achieve drag reduction function, reducing dynamic wear of sealing surface and improving structural compatibility.

[0068] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. An in-line valve actuator head opening loop (1) characterized by: The application is applied to a valve actuator, rotates around a stroke column (3) of the valve actuator, and provides a supporting force for the stroke column (3), The first open ring (1) comprises: A ring body (101) is sleeved on the stroke column (3) and is arranged in a circumferential reciprocating rotation mode, A jacking block (102) is located on a top end face of the ring body (101) and is used for providing a supporting force for the stroke column (3), A jack pin (106) is located on an inner wall of the ring body (101); the jack pin (106) extends downward beyond a bottom end face of the ring body (101), 2. The in-line valve actuator open loop (1) as claimed in claim 1, characterized in that: A reset spring (103) is directed to a base (2) of the valve actuator; a plane in which a deformation path of the reset spring (103) is located is perpendicular to a movement path of the stroke column (3).

3. The in-line valve actuator open loop (1) as claimed in claim 2, characterized in that: The ring body (101) is an open ring; a central angle of an open part of the ring body (101) is smaller than a central angle of a part of the ring body (101).

4. The in-line valve actuator open loop (1) as claimed in claim 1, characterized in that: The reset spring (103) is located at a middle section of the ring body (101).

5. The in-line valve actuator open loop (1) as claimed in claim 4, characterized in that: The jacking block (102) is arranged in an upward extending mode perpendicular to the ring body (101).

6. The in-line valve actuator open loop (1) as claimed in claim 1, characterized in that: A height of the jacking block (102) is smaller than a jacking limit height of the stroke column (3).

7. The in-line valve actuator open loop (1) as claimed in claim 6, characterized in that: A top face of the jack pin (106) is coplanar with an upper end face of the ring body (101).

8. The in-line valve actuator open loop (1) as claimed in claim 1, characterized in that: An installation point (105) is formed on a side wall of the jack pin (106); one end of the reset spring (103) is sleeved on the installation point (105).

9. The in-line valve actuator open loop (1) as claimed in claim 1, characterized in that: A bottom end of the jack pin (106) falls into a groove structure on the base (2) of the valve actuator. The first open ring (1) is integrally formed by a plastic part.

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