First mounting structure of valve actuator and mounting and resetting method

Abstract

The valve actuator first installation structure comprises an actuator body, the actuator body comprises a base, a stroke column and a shell, a first opening ring is rotatably installed on the base, and the first opening ring comprises a ring body which is arranged at the junction of the stroke column and the base in a sleeving mode and a jacking block which is located on the upper end face of the ring body; when the jacking block rotates along with the ring body, the jacking block has two states of supporting the stroke column and releasing the stroke column to reset, the reset elastic piece extends to the interior of the shell from the ring body, and the reset elastic piece abuts against the shell when the jacking block is in the supporting state. And the elastic deformation reset force is smaller than the frictional resistance generated when the stroke column is pressurized on the jacking block. The first open ring is additionally arranged on the base, the stroke column is supported by the first open ring, and the axial thrust needing to be overcome by an operator during installation is remarkably weakened.

Description

Technical Field

[0001] The present invention relates to the technical field of valve automatic control, and in particular to a first installation structure of a valve actuator and an installation and reset method. Background Art

[0002] A compression spring is arranged inside the valve actuator. Usually, the pre-tightening force of the compression spring is relatively large. In the prior art, the pre-tightening force is set to more than 10 kg (industry standard); plus the pre-tightening force of the valve core spring (generally more than 4 kg), during installation, it is necessary to overcome the axial thrust brought by the pre-tightening forces of both the actuator and the valve core spring to install correctly.

[0003] The initial pre-tightening force of the spring is 10 + 4 kg. As the spring is compressed during installation, the force required for installation will increase linearly. After the actuator spring is compressed by 3 mm, it will increase by 18 N and 1.8 kg of force, and the force required to install the valve will also increase linearly. Summary of the Invention

[0004] The applicant of the present invention aims at the above-mentioned disadvantages in the existing production technology, and provides a first installation structure of a valve actuator and an installation and reset method with reasonable structure, which adds a first open loop on the basis of the existing technology, can reduce the resistance during the first installation, and can be reused.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A first installation structure of a valve actuator includes an actuator body, the actuator body includes a base, a stroke column, and a housing. A first open loop is rotatably installed on the base. The first open loop includes:

[0007] A ring body, sleeved at the junction of the stroke column and the base,

[0008] A jacking block, located on the upper end surface of the ring body; when the jacking block rotates with the ring body, there are two states: supporting the stroke column and releasing the stroke column to reset,

[0009] A reset elastic member, extending from the ring body to the inside of the housing. When the jacking block is in the supporting state, the reset elastic member abuts against the housing; and the elastic deformation reset force is less than the frictional resistance generated by the stroke column pressing on the jacking block.

[0010] As a further improvement of the above technical solution:

[0011] The reset elastic member adopts a special-shaped bending structure. When the ring body rotates to the supporting state, its bent part abuts against the housing to form a deformation force.

[0012] The reset elastic member includes:

[0013] A flat extension section, extending from the ring body and pointing to the housing,

[0014] The longitudinal extension section is located at one end of the horizontal extension section close to the outer shell and extends vertically upward perpendicular to the annular body.

[0015] The deformation section is located at the top of the longitudinal extension section and is set at an angle with the longitudinal extension section; the deformation section is used to abut against the outer shell.

[0016] The deformation section and the longitudinal extension section are arranged coplanarly.

[0017] The inner wall of the outer shell is formed with a resisting rib plate, and the bottom end of the resisting rib plate is set with an arc-shaped contour.

[0018] The deformation section abuts against the arc-shaped contour at the bottom of the resisting rib plate.

[0019] The jacking blocks and the reset elastic members are both arranged in an array on the annular body.

[0020] The annular body is an open ring.

[0021] A jacking method for the first installation structure of a valve actuator includes the following steps:

[0022] The thermal expansion body built in the valve actuator is energized and heated to expand, and the stroke column is jacked up to the expected height.

[0023] The annular body is rotated to move the jacking block below the convex structure of the stroke column. At this time, the annular body supports the stroke column, and the reset elastic member abuts against the resisting rib plate and deforms.

[0024] At this time, the first-opening ring supports the stroke column, reducing the axial thrust that the operator needs to overcome during installation.

[0025] A reset method for the first installation structure of a valve actuator includes the following steps:

[0026] The thermal expansion body continues to expand due to heat, causing the stroke column to continue to rise; when the rising height of the stroke column is greater than the above-mentioned expected height, the longitudinal pressure on the first-opening ring disappears, and the reset elastic member resets, pushing the annular body away from the supporting position.

[0027] The beneficial effects of the present invention are as follows:

[0028] The structure of the present utility model is compact and reasonable, and the operation is convenient. By adding a first-opening ring on the base, the initial installation resistance can be reduced, and the problem of the 14 kg axial installation resistance caused by the superposition of the internal pre-tightening force (10 kg) of the existing electric actuator and the valve thrust (4 kg) during the first installation can be solved, making the manual installation force value meet the recommended range of ASME B16.34 standard (≤8 kg).

[0029] In this application, by raising the initial contact position between the actuator and the valve core by 4 mm, the peak resistance in the initial installation stage is reduced from 14 kg to 0 kg. Since the force in the initial installation stage is the smallest (10 kg + 4 kg), as the spring is compressed, the force rises linearly; after reducing the force in the initial stage to 0 kg, the force required for subsequent valve installation is also greatly reduced.

[0030] This application can also achieve the reversibility of the drag reduction function, overcome the defect that the existing temporary drag reduction mechanism cannot be reset, and provide a regulation mechanism that can automatically fail after installation and can be repeatedly activated by mechanical or electrical signals, meeting the requirements of repeated installation after maintenance disassembly and system pressure testing (refer to GB / T 17446 Test Method for Reliability of Sealing Elements). The first open loop can rotate forward and backward clockwise and counterclockwise. After completing the support action, it can be reset to the initial state to achieve the purpose of repeated use for more than 50 times; when reinstalling repeatedly, the initial installation resistance deviation rate can still be maintained at < 5%.

[0031] This application can reduce the dynamic wear of the sealing surface, eliminate the forced relative sliding between the sealing surfaces of the actuator and the valve core during installation, and reduce the O-ring wear rate to less than 1 / 3 of the traditional solution (refer to the ASTM D1414 standard test method).

[0032] This application improves the compatibility of the structure. On the premise of maintaining the original sealing performance (meeting the requirements of GB / T 13927 Valve Pressure Test), it is not necessary to change the interface dimensions between the actuator and the manifold, and it is compatible with existing standard valve bodies. Brief Description of the Drawings

[0033] Figure 1 It is a schematic diagram of the overall structure of the valve actuator of the present invention.

[0034] Figure 2 It is a schematic diagram of the hidden housing structure of the valve actuator of the present invention.

[0035] Figure 3 It is a schematic diagram of the structure of the first open loop of the present invention.

[0036] Figure 4 It is a schematic diagram of the structure of the first open loop from another perspective of the present invention.

[0037] Figure 5 It is a schematic diagram of the base structure of the present invention.

[0038] Figure 6 It is a schematic diagram of the housing structure of the present invention.

[0039] Figure 7 It is a schematic diagram of the mating state of the housing and the first open loop of the present invention.

[0040] Wherein: 1. Base; 2. Stroke column; 3. Outer shell; 4. First opening ring;

[0041] 101. Limit rib;

[0042] 401. Ring body; 402. Lifting block; 403. Reset elastic member; 404. Horizontal extension section; 405. Vertical extension section; 406. Deformation section; 407. Contact rib plate; 408. Stroke block; 408. Thimble. Specific embodiments

[0043] The following combines with the attached drawings to illustrate the specific embodiments of the present invention.

[0044] As Figures 1-7 shown, the first installation structure of the valve actuator in this embodiment includes an actuator body. The actuator body includes a base 1, a stroke column 2, and an outer shell 3. A first opening ring 4 is rotatably installed on the base 1. The first opening ring 4 includes:

[0045] A ring body 401, sleeved at the junction of the stroke column 2 and the base 1,

[0046] A lifting block 402, located on the upper end surface of the ring body 401; when the lifting block 402 rotates with the ring body 401, there are two states: supporting the stroke column 2 and releasing the stroke column 2 to reset,

[0047] A reset elastic member 403, extending from the ring body 401 to the inside of the outer shell 3. When the lifting block 402 is in the supporting state, the reset elastic member 403 abuts against the outer shell 3; and the elastic deformation reset force is less than the frictional resistance generated by the pressure of the stroke column 2 on the lifting block 402.

[0048] The reset elastic member 403 adopts a special-shaped bending structure. When the ring body 401 rotates to the supporting state, its bent part abuts against the outer shell 3 to form a deformation force.

[0049] The reset elastic member 403 includes:

[0050] A horizontal extension section 404, extending from the ring body 401 and pointing to the outer shell 3,

[0051] A vertical extension section 405, located at one end of the horizontal extension section 404 close to the outer shell 3, extending vertically upward from the ring body 401,

[0052] A deformation section 406, located at the top of the vertical extension section 405, and set at an angle with the vertical extension section 405; the deformation section 406 is used to abut against the outer shell 3.

[0053] The deformation section 406 and the vertical extension section 405 are arranged in the same plane.

[0054] A contact rib plate 407 is formed on the inner wall of the outer shell 3, and the bottom end of the contact rib plate 407 is set with an arc-shaped contour.

[0055] The deformation section 406 abuts against the arc-shaped contour of the bottom of the abutting rib 407 .

[0056] The lifting blocks 402 and the resetting elastic members 403 are arranged in an array on the ring body 401 .

[0057] The ring body 401 is an open ring.

[0058] The jacking method of the first installation structure of the valve actuator of this embodiment includes the following steps:

[0059] The thermal expansion body built into the valve actuator is energized and heated to expand, lifting the travel column 2 to the expected height;

[0060] The ring body 401 is rotated to move the lifting block 402 to below the raised structure of the travel column 2. At this time, the ring body 401 supports the travel column 2, and the reset elastic member 403 abuts against the abutting rib 407 and deforms.

[0061] At this time, the first opening ring 4 supports the travel column 2 to reduce the axial thrust that the operator needs to overcome during installation.

[0062] The method for resetting the first-installation structure of the valve actuator of this embodiment includes the following steps:

[0063] The thermal expansion body continues to expand due to heat, causing the travel column 2 to continue to rise; when the lifting height of the travel column 2 is greater than the above-mentioned expected height, the longitudinal pressure on the first opening ring 4 disappears, the reset elastic member 403 resets, and pushes the ring body 401 to retreat from the supporting position.

[0064] The specific structure and working process of this application are as follows:

[0065] The valve actuator is equipped with a compression spring inside. Usually, the preload force of the compression spring is relatively large. In some existing technologies, the preload force is set to 10kg. In addition, the reaction force of the valve core fluid is added to achieve the compression of the sealing surface. Under this structural premise, the resistance in the initial stage of installation is relatively large, which is the sum of the preload force and the reaction force. During installation, a large axial thrust must be overcome.

[0066] The high initial resistance is concentrated in the initial stage of installation. 90% of the resistance needs to be overcome in the first 3mm of travel, which makes it difficult for the operator to apply force. Moreover, after multiple disassembly and assembly, the spring preload force decays significantly and the service life decays rapidly.

[0067] The present application achieves the purpose of expanding the closing size by the elastic expansion and contraction force generated by the reset elastic member 403 in cooperation with the support structure at the fixed position; and the function of repeatedly setting the first installation position is generated by the thrust of the first opening spring.

[0068] like Figure 2 As shown, the present application adds a first opening loop 4 on the basis of the conventional actuator, such asFigure 3 and Figure 4 As shown, the first open ring 4 includes a ring body 401, a lifting block 402 is formed on the top surface of the ring body 401, and a reset elastic member 403 is formed on the outer wall of the ring body 401, and the reset elastic member 403 is set to a deformable structure tending to a triangle. Specifically, the reset elastic member 403 includes a flat section 404 located on the diameter of the ring body 401, and a triangular deformable structure is connected to the end of the flat section 404 away from the ring body 401. The deformable structure includes a longitudinal section 405 connected to and perpendicular to the flat section 404, and a deformation section 406 with an acute angle between the longitudinal section 405. In order to facilitate deformation reset, the longitudinal section 405 and the deformation section 406 form an open triangular structure, and a rounded structure is used at the angle between the longitudinal section 405 and the deformation section 406 to reduce the probability of deformation damage.

[0069] Correspondingly, such as Figure 6 and Figure 7 As shown, a resisting rib 407 is formed on the inner wall of the housing 3, and the bottom end profile of the resisting rib 407 adopts an arc profile composed of a straight line segment and a curved line segment. When the deformation segment 406 of the reset elastic member 403 rotates with the ring body 401, the bottom end of the deformation segment 406 first contacts the bottom end of the resisting rib 407. As the ring body 401 rotates, the deformation segment 406 gradually approaches the resisting rib 407 and is pressed toward the longitudinal section 405 by the resisting rib 407, forming elastic potential energy of deformation. When the rotational force and the pressure applied by the stroke column 2 to the lifting block 402 of the ring body 401 are removed, the elastic potential energy pushes the ring body 401 to reset.

[0070] like Figure 2 As shown, a travel block 408 is also formed on the outer wall of the ring body 401. The thickness of the travel block 408 is the same as that of the ring body 401. The purpose of the travel block 408 is to limit the length of the rotation path of the first open ring 4; one of the travel blocks 408 is equivalent to increasing the end surface area at a certain position on the first open ring 4, so that the lifting block 402 is set at the increased area here to support the bottom end of the lifting block 402.

[0071] The function of the first opening ring 4 is to lift the travel column 2. The outer circular contour of the travel column 2 has a ring array of ribs and a top block, wherein the top block is a convex structure on the travel column 2. The lifting block 402 on the first opening ring 4 is used to support the top block, and plays a supporting role for the top block and the travel column 2.

[0072] The first open ring 4 is placed on the base 1, as Figure 5As shown, the base 1 is formed with a circumferential limit rib 101, and one end of the limit rib 101 pointing to the center of the circle is close to the first opening ring 4, which plays a limiting role on the first opening ring 4. The travel block 408 on the first opening ring 4 falls between two adjacent limit ribs 101. When the travel block 408 rotates with the first opening ring 4, the movement path is the arc distance between the two adjacent limit ribs 101, which prevents the protrusion and the travel column 2 from being difficult to align due to a large rotation angle.

[0073] As an optimized implementation of this embodiment, the travel block 408 on the first open ring 4 is designed as follows: when the travel block 408 moves close to the limiting rib 101 on one side, the protrusion can just fall under the top block of the travel column 2, and the limiting rib 101 also plays a role in auxiliary positioning and auxiliary alignment.

[0074] The working process of the actuator in this embodiment is as follows:

[0075] When the first installation function is set, the travel column 2 is first lifted by 4 mm. The lifting here is the prior art, and the inventor briefly explains it as follows:

[0076] During the production process, the actuator is turned upside down and pressure is applied from top to bottom through a special fixture. Figure 6 The bottom of the actuator is shown in the concave position, and the pressing displacement is 4mm, that is, the stroke column 3 is first lifted by 4mm. At the same time, the ejector pin 106 with the slope surface moves the reset structure of the first opening ring 1, so that the first opening ring 1 rotates to the expected position.

[0077] After the initial lifting is completed, the first opening ring 4 rotates to the expected angle. At this time, the protrusion of the first opening ring 4 is just below the top block, supporting the top block and the travel column 2. The reset elastic member 403 is in a compressed state at this time, and the reaction force of the compression spring sleeved on the travel column 2 is applied to the travel column 2 and the first opening ring 4, pressing the first opening ring 4 to limit the position. At this time, the travel column 2 is lifted by the first opening ring 4 by 4mm.

[0078] When the actuator is powered on, the thermal expansion body built into the stroke column 2 expands due to the heat, supporting the stroke column 2 to continue to rise. When the lifting height is greater than 4 mm, the pressure on the first open ring 4 disappears. At this time, the reset force of the reset elastic member 403 acts to push the first open ring 4 back to its initial position.

[0079] After the actuator is powered off and the thermal expansion body shrinks, since there is no support of the first opening ring 4 under the top block, the travel column 2 is completely pushed to the bottom under the action of the compression spring, and the valve is closed.

[0080] When the first installation function needs to be reset, the first installation function can be reset by pushing the stroke column 2 up by >4MM from the bottom of the actuator, rotating the first opening ring 4 to a fixed angle, and then withdrawing the bottom thrust.

[0081] This application solves the problem that when the existing electric heating actuator is first installed, it needs to overcome the superposition of the internal pre-tightening force (10 kg) and the valve thrust (4 kg) of the actuator, resulting in an axial installation resistance of 14 kg, so that the manual installation force value conforms to the recommended range of ASME B16.34 standard (≤8 kg); and has the advantages of reversibility to realize the resistance reduction function, reducing the dynamic wear of the sealing surface and improving the structural compatibility, etc.

[0082] The above description is an explanation of the present invention, not a limitation of the invention. For the scope defined by the present invention, refer to the claims. Any form of modification can be made within the protection scope of the present invention.

Claims

1. A first-installation structure of a valve actuator, comprising an actuator body, the actuator body including a base (1), a stroke column (2), and a housing (3), characterized in that: A first-opening ring (4) is rotatably mounted on a base (1). The first-opening ring (4) includes: A ring body (401) sleeved at the junction of a stroke column (2) and the base (1). A jacking block (402) located on the upper end face of the ring body (401). When the jacking block (402) rotates with the ring body (401), it has two states: supporting the stroke column (2) and releasing the stroke column (2) to reset. A reset elastic member (403) extending from the ring body (401) to the inside of the housing (3). When the jacking block (402) is in the supporting state, the reset elastic member (403) abuts against the housing (3); and the elastic deformation restoring force is less than the frictional resistance generated by the pressure of the stroke column (2) on the jacking block (402).

2. The first-installation structure of the valve actuator according to claim 1, characterized in that: The reset elastic member (403) adopts a special-shaped bending structure. When the ring body (401) rotates to the supporting state, its bent part abuts against the housing (3) to form a deformation force.

3. The first-installation structure of the valve actuator according to claim 2, wherein: The reset elastic member (403) includes: A flat extension section (404) extending from the ring body (401) and pointing to the housing (3). A longitudinal extension section (405) located at one end of the flat extension section (404) close to the housing (3), vertically extending upward from the ring body (401). A deformation section (406) located at the top of the longitudinal extension section (405), with an included angle set between the deformation section (406) and the longitudinal extension section (405); the deformation section (406) is used to abut against the housing (3).

4. The first installation structure of the valve actuator according to claim 3, wherein: The deformation section (406) and the longitudinal extension section (405) are arranged in the same plane.

5. The first installation structure of the valve actuator according to claim 3, characterized in that: Abutting rib plates (407) are formed on the inner wall of the housing (3), and the bottom ends of the abutting rib plates (407) are provided with an arc-shaped contour.

6. The first installation structure of the valve actuator according to claim 5, characterized in that: The deformation section (406) abuts against the arc-shaped contour at the bottom of the abutting rib plate (407).

7. The first installation structure of the valve actuator according to claim 1, characterized in that: The jacking block (402) and the reset elastic member (403) are both arranged in an array on the ring body (401).

8. The first-installed structure of the valve actuator according to claim 7, characterized in that: The ring body (401) is an open ring.

9. A jacking method for the first installation structure of a valve actuator as described in claim 1, characterized in that, It includes the following steps: The thermal expansion body built in the valve actuator is energized and heated to expand, jacking the stroke column (2) to an expected height. Rotate the ring body (401) to move the jacking block (402) below the convex structure of the stroke column (2). At this time, the ring body (401) supports the stroke column (2), and the reset elastic member (403) abuts against the abutting rib plate (407) and deforms. At this time, the first-opening ring (4) supports the stroke column (2), reducing the axial thrust that the operator needs to overcome during installation.

10. A reset method for the first installation structure of a valve actuator as described in claim 1, characterized in that, It includes the following steps: The thermal expansion body continues to heat and expand, causing the stroke column (2) to continue to rise; when the rising height of the stroke column (2) is greater than the above-mentioned expected height, the longitudinal pressure on the first-opening ring (4) disappears, and the reset elastic member (403) resets, pushing the ring body (401) away from the supporting position.

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