Labor-saving first opening ring of valve actuator

Abstract

The invention relates to a labor-saving first opening ring of a valve actuator, which is applied to the valve actuator and has supporting force acting on the bottom of a stroke column of the jacking valve actuator. The first open ring comprises a ring body serving as a jacking reference and rotatably arranged around the circle center of the ring body, and a jacking block arranged on the ring body and facing the stroke column; the jacking block applies jacking supporting force to the stroke column in the process of rotating along with the ring body, the reset spring is installed on the inner wall of the ring body, the axis of the reset spring is parallel to the ring body, and when the ring body rotates to a jacking state, the jacking block is limited by pressure on the stroke column; friction resistance generated when the stroke column abuts against the jacking block is larger than reset elastic force of the reset spring. 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] The present invention relates to the technical field of valve automatic control, and in particular to a labor-saving first open-loop of a valve actuator. 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 be correctly installed.

[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 valve actuator labor-saving first open-loop with a reasonable structure, so as to reduce the resistance during the first installation and be reusable.

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

[0006] A valve actuator labor-saving first open-loop is applied to a valve actuator and has a supporting force acting on the bottom of a stroke column for jacking up the valve actuator; the first open-loop includes:

[0007] A ring body, serving as a jacking reference, is rotatably arranged around its center.

[0008] A jacking block is arranged on the ring body and faces the stroke column; during the rotation of the ring body, the jacking block applies a jacking support force to the stroke column.

[0009] A return spring is installed at the inner wall of the ring body, and the axis of the return spring is parallel to the ring body.

[0010] When the ring body rotates to the jacking state, the jacking block is limited by the pressure on the stroke column; the frictional resistance generated by the stroke column against the jacking block is greater than the return elastic force of the return spring.

[0011] As a further improvement of the above technical solution:

[0012] The ring body is of an open structure.

[0013] The installation position of the return spring and the opening position are respectively located on the opposite sides of the ring body.

[0014] The axial height of the jacking block is less than the limit height that the stroke column of the valve actuator can be lifted.

[0015] The lifting blocks are arranged in a circular array on the first open ring.

[0016] Chamfer setting for top profile of jacking block.

[0017] The lifting block faces one side of the stroke column and is coplanar with the inner wall of the ring body.

[0018] A travel block is protrudingly formed on the outer circular contour surface of the ring body, and the movement path of the travel block is limited by the valve actuator structure.

[0019] An installation point is formed on the inner wall of the ring body, one end of the return spring is sleeved on the installation point, and the other end is a free end.

[0020] The end of the return spring away from the mounting point resists deformation only when the ring body is in a rotating state.

[0021] The beneficial effects of the present invention are as follows:

[0022] This application has a compact and reasonable structure, is easy to operate, and can reduce the initial installation resistance. It solves the problem of the existing electric heating actuator having to overcome the 14kg axial installation resistance caused by the superposition of the internal preload force (10kg) of the actuator and the valve thrust (4kg) during the first installation, so that the manual installation force value meets the recommended range of the ASME B16.34 standard (≤8kg). This application reduces the peak resistance in the initial stage of installation from 14kg to 0kg by raising the initial contact position between the actuator and the valve core by 4mm. Since the force in the initial stage of installation is the smallest (10kg+4kg), the force increases linearly as the spring is compressed; after the force in the initial stage is reduced to 0kg, the force required for subsequent valve installation is also greatly reduced.

[0023] The first-open ring reset in the present application is achieved with the assistance of the first-open spring, and the reset is faster and more convenient.

[0024] The present 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 control mechanism that can automatically fail after installation and can be repeatedly activated by mechanical or electrical signals, meeting the requirements of repeated installation and system pressure testing after maintenance and disassembly (refer to GB / T 17446 Sealing Component Reliability Test Method). The first open ring can be reversed clockwise and counterclockwise, and after completing the supporting action, it can be reset to the initial state to achieve the purpose of repeated use, supporting more than 50 times of repeated use; 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 the 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 traditional solution (refer to ASTM D1414 standard test method).

[0026] This application improves the compatibility of the structure. Under the premise of maintaining the original sealing performance (meeting the valve pressure test requirements of GB / T 13927), there is no need to change the interface size between the actuator and the manifold, and it is adapted to the existing standard valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the first open ring structure of the present invention.

[0028] Figure 2 It is a structural schematic diagram of the first open ring of the present invention from another perspective.

[0029] Figure 3 It is a schematic structural diagram of the first open ring without a return spring of the present invention.

[0030] Figure 4 This is a schematic structural diagram from another perspective of the first open ring of the present invention without a return spring.

[0031] Figure 5 This is a schematic diagram of the first open ring of the present invention being applied to a valve actuator, in which the housing is hidden.

[0032] Figure 6 It is a bottom view of the valve actuator with the first open ring of the present invention.

[0033] Among them: 1. First open ring; 2. Base; 3. Travel column; 4. Compression spring;

[0034] 101, ring body; 102, lifting block; 103, return spring; 104, travel block; 105, mounting point; 106, ejector pin;

[0035] 201, limiting ribs;

[0036] 301. Top block; 302. Rib plate. DETAILED DESCRIPTION

[0037] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0038] like Figures 1 - 6 As shown, the valve actuator labor-saving first opening ring 1 of this embodiment is applied to the valve actuator and has a supporting force acting on the bottom of the stroke column 3 of the jacking valve actuator; the first opening ring 1 includes:

[0039] The ring body 101, as a lifting reference, can be rotatably arranged around its center.

[0040] The lifting block 102 is arranged on the ring body 101 and faces the travel column 3. The lifting block 102 applies a lifting support force to the travel column 3 during the rotation of the ring body 101.

[0041] The return spring 103 is installed on the inner wall of the ring body 101, and the axis of the return spring 103 is parallel to the ring body 101.

[0042] When the ring body 101 rotates to the lifting state, the lifting block 102 is limited by the pressure on the travel column 3 ; the friction resistance generated by the travel column 3 against the lifting block 102 is greater than the restoring elastic force of the restoring spring 103 .

[0043] The ring body 101 is an open structure.

[0044] The installation position and the opening position of the return spring 103 are located at opposite sides of the ring body 101 .

[0045] The axial height of the lifting block 102 is smaller than the maximum height that the travel column 3 of the valve actuator can lift.

[0046] The lifting blocks 102 are arranged in a circular array on the first open ring 1 .

[0047] The top profile of the lifting block 102 is chamfered.

[0048] The lifting block 102 faces one side of the travel column 3 and is coplanar with the inner wall of the ring body 101 .

[0049] A travel block 104 is protrudingly formed on the outer circular contour surface of the ring body 101 , and the movement path of the travel block 104 is limited by the structure of the valve actuator.

[0050] An installation point 105 is formed on the inner wall of the ring body 101 , and one end of the return spring 103 is sleeved on the installation point 105 , and the other end is a free end.

[0051] The end of the return spring 103 away from the mounting point 105 is deformed only when the ring body 101 is in the rotating state.

[0052] The specific structure and working principle of this application are as follows:

[0053] The valve actuator is provided with a compression spring 4, which usually has a large preload force. In some prior arts, the preload force is set to 10 kg. 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 large, which is the sum of the preload force and the reaction force. During installation, a large axial thrust must be overcome.

[0054] 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.

[0055] This application achieves the purpose of expanding the closing size by the elastic telescopic force generated after the compression spring 4 is compressed, in cooperation with the support structure at a fixed position; and generates the function of repeatedly setting the first installation position through the thrust of the first-opening spring.

[0056] As Figure 5 shown, based on a conventional actuator, this application adds a first-opening ring 1. As Figure 1 and Figure 2 shown, the first-opening ring 1 includes a ring body 101. A protrusion is formed on the top surface of the ring body 101, and an installation point 105 is formed on the inner wall of the ring body 101. A first-opening spring is sleeved on the installation point 105; a travel block 104 is formed on the outer wall of the ring body 101. The thickness of the travel block 104 is the same as that of the ring body 101. The purpose of the travel block 104 is to limit the rotation path length of the first-opening ring 1; one of the travel blocks 104 is equivalent to increasing the end face area at a certain position on the first-opening ring 1, so as to facilitate the setting of a jacking block 102 and supporting the bottom end of the supporting jacking block 102 at the increased area.

[0057] The function of the first-opening ring 1 is to lift the travel column 3. Rib plates 302 and top blocks 301 are annularly arranged on the outer circular contour of the travel column 3. The jacking block 102 on the first-opening ring 1 is used to support the top block 301, and plays a supporting role for the top block 301 and the travel column 3 on the travel column 3.

[0058] As Figure 5 shown, the first-opening ring 1 is placed on the base 2. A limiting rib 201 is formed on the circumference of the base 2. One end of the limiting rib 201 pointing to the center of the circle is close to the first-opening ring 1, playing a limiting role for the first-opening ring 1. The travel block 104 on the first-opening ring 1 falls between two adjacent limiting ribs 201. When the travel block 104 rotates with the first-opening ring 1, the movement path is the arc distance between two adjacent limiting ribs 201, preventing the protrusion and the travel column 3 from being difficult to align due to too large a rotation angle.

[0059] As an optimized implementation manner of this embodiment, the travel block 104 on the first-opening ring 1 is designed such that when the travel block 104 moves to be close to one side of the limiting rib 201, the protrusion can just fall below the top block 301 of the travel column 3, and the limiting rib 201 simultaneously plays a role of assisting in positioning and assisting in finding the right position.

[0060] The working process of the actuator in this embodiment is as follows:

[0061] When the first installation function is set, the travel column 3 first lifts by 4 mm. This lift is a prior art, and the inventor makes a simple explanation as follows:

[0062] During the production process, the actuator is inverted, and pressure is applied from top to bottom through a special fixture. The pressure acts on as Figure 6The 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.

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

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

[0065] After the actuator is powered off and the thermal expansion body shrinks, since there is no support of the first opening ring 1 below the top block 301, the travel column 3 is completely pushed to the bottom under the action of the compression spring 4, and the valve is closed.

[0066] When the first installation function needs to be reset, the first installation function can be reset by pushing the stroke column 3 up by >4MM from the bottom of the actuator, rotating the first opening ring 1 to a fixed angle, and then withdrawing the bottom thrust.

[0067] The advantage of this application is that a first opening ring is added inside the actuator, and the 4mm protrusion on the first opening ring is used. When the protrusion is rotated to the preset position, the main spring inside the actuator can be compressed by 4mm, and the contact position with the valve core can be raised by 4mm, so that the actuator can be installed on the manifold with zero resistance. At the same time, the structure can be reset manually, which is convenient for installers to install and use repeatedly. It solves the problem of the existing electric heating actuator having to overcome the 14kg axial installation resistance caused by the superposition of the internal preload force (10kg) of the actuator and the valve thrust (4kg) at the first installation, so that the manual installation force value meets the recommended range of the ASME B16.34 standard (≤8kg); and it has the advantages of reversibility to achieve the drag reduction function, reduce dynamic wear on the sealing surface, and improve the compatibility of the structure.

[0068] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A valve actuator labor-saving first open loop (1), characterized in that: Applied to a valve actuator, the device has a supporting force acting on the bottom of a travel column (3) of the valve actuator; the first opening loop (1) comprises: The ring body (101) serves as a lifting reference, and the ring body (101) is rotatable around its center. The lifting block (102) is arranged on the ring body (101) and faces the travel column (3); the lifting block (102) applies a lifting support force to the travel column (3) during the rotation of the ring body (101). The return spring (103) is installed on the inner wall of the ring body (101), and the axis of the return spring (103) is parallel to the ring body (101). When the ring body (101) rotates to the lifting state, the lifting block (102) is limited by the pressure on the travel column (3); the friction resistance generated by the travel column (3) contacting the lifting block (102) is greater than the restoring elastic force of the restoring spring (103).

2. The valve actuator labor-saving first open loop (1) as described in claim 1, characterized in that: The ring body (101) is an open structure.

3. The valve actuator force-saving first open loop (1) according to claim 2, characterized in that: The installation position and the opening position of the return spring (103) are located at opposite sides of the ring body (101).

4. The valve actuator labor-saving first open loop (1) according to claim 1, characterized in that: The axial height of the lifting block (102) is smaller than the maximum height that the travel column (3) of the valve actuator can lift.

5. The valve actuator force-saving first open loop (1) as described in claim 1, characterized in that: The lifting blocks (102) are arranged in a circular array on the first open ring (1).

6. The valve actuator with labor-saving first open loop (1) as described in claim 1, characterized in that: The top contour of the lifting block (102) is chamfered.

7. The valve actuator force-saving first open loop (1) as described in claim 1, characterized in that: The lifting block (102) faces one side of the travel column (3) and is coplanar with the inner wall of the ring body (101).

8. The valve actuator labor-saving first open loop (1) as described in claim 1, characterized in that: A travel block (104) is protrudingly formed on the outer circular contour surface of the ring body (101), and the movement path of the travel block (104) is limited by the valve actuator structure.

9. The valve actuator force-saving first open loop (1) as described in claim 1 is characterized in that: The inner wall of the ring body (101) is formed with a mounting point (105), one end of the return spring (103) is sleeved on the mounting point (105), and the other end is a free end.

10. The valve actuator force-saving first open loop (1) as described in claim 9, characterized in that: One end of the return spring (103) that is away from the mounting point (105) resists deformation only when the ring body (101) is in a rotating state.

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