Adjustable coaxiality coupling device

Abstract

The application discloses a coaxiality-adjustable coupling device, a lifting cage (9) is installed in a lifting cage sliding sleeve (16) and the two are in clearance fit, the lower part of the lifting cage (9) is provided with a chuck (22), the chuck (22) is provided with a spherical arc surface (23) on the upper and lower parts respectively, a bushing (8) is sleeved on a valve rod shaft diameter (19), the lower plane of the bushing (8) is tightly attached to a shaft shoulder (24), the outer part of the bushing (8) is sequentially provided with a lower sliding arc gasket (10), the chuck (22), an upper sliding arc gasket (11), a gasket (12) and a spring gasket (13), a nut (14) is screwed on a valve rod threaded rod (15), and a gap (18) is arranged between the upper sliding arc gasket (11) and the gasket (12). The device for adjusting the coaxiality has simple component structure, low manufacturing cost and is convenient for maintenance and replacement.

Description

Technical Field

[0001] This invention relates to a coupling device with adjustable coaxiality. Background Technology

[0002] Generally, a coupling device is required between the valve stem and the actuator of a valve. Currently, rigid clamps are most commonly used. Although the connection strength can meet the usage requirements, the inability to adjust the coaxiality causes the valve stem and actuator to bear large stresses during up-and-down movement, which can easily lead to wear on the valve stem, bushing, and packing. Therefore, it is essential to develop a coupling device with adjustable coaxiality. Summary of the Invention

[0003] The purpose of this invention is to provide an adjustable coaxial coupling device, which dynamically adjusts the coaxiality through the sliding of a spherical arc surface. The technical solution of this invention is: an adjustable coaxial coupling device, wherein the valve stem (1) passes through the center hole (20) of the valve body, the gland fastening bolt (4) fastens the packing ring gland (6) to the valve body (2), the gland fastening bolt (4) presses the sealing packing ring (3) into the packing chamber (21), the bolt (7) fastens the lifting cage sliding sleeve base (5) to the valve body (2), the lifting cage (9) is installed in the lifting cage sliding sleeve (16), the lifting cage (9) and the lifting cage sliding sleeve (16) are clearance-fitted, the upper part of the lifting cage (9) has a lifting cage traction rod (17), and the lower part of the lifting cage (9) has a chuck. (22) The upper and lower end faces of the chuck (22) each have a spherical arc surface (23). The bushing (8) is fitted on the valve stem shaft diameter (19). The lower surface of the bushing (8) is close to the shaft shoulder (24). The bushing (8) is installed in sequence with the sliding arc washer (10), chuck (22), upper sliding arc washer (11), washer (12) and spring washer (13). The nut (14) is fitted with the valve stem thread rod (15). The washer (12) is pressed tightly against the upper surface of the bushing (8). When the lifting cage (9) presses down on the valve stem (1), there is a gap (18) between the upper sliding arc washer (11) and the washer (12).

[0004] The value of the gap (18) is 0.04 to 0.08 mm.

[0005] The diameter of the chuck (22) is 1 to 2 mm larger than the outer diameter of the bushing (8).

[0006] The spherical arc surfaces above and below the chuck (22) have the same arc dimensions as the spherical arc surfaces of the sliding arc pad (10) and the upper sliding arc pad (11).

[0007] Working principle of the invention:

[0008] The lifting cage (9) moves up and down within the lifting cage sleeve (16) to control the lifting height of the valve stem (1). While moving up and down, it is accompanied by slight horizontal movements in the front, back, left and right directions. The lower coaxial valve stem is confined within the valve body bushing and packing ring. Without a coupling device that can flexibly adjust the coaxiality, stress will be generated. This invention designs an adjustable coaxial coupling device. The device uses upper and lower spherical arc surface workpieces. The lower sliding arc pad (10) and the upper sliding arc pad (11) slide in cooperation with the upper and lower spherical arc surfaces of the chuck (22) on the lifting cage (9). When the lifting cage (9) and the valve stem (1) are not coaxial, the bushing (8) will carry the valve stem (1) to move freely in the chuck (22). Since there is a gap (18) of 0.04 to 0.08 mm between the upper sliding arc pad (11) and the pad (12), and the diameter of the chuck (22) is 1 to 2 mm larger than the outer diameter of the bushing (8), the above gap ensures that the valve stem (1) can slide freely in the chuck (22) and be coaxial at all times, eliminating the non-axial stress generated at the connection between the lifting cage (9) and the valve stem (1).

[0009] Technical effects of the invention:

[0010] The adjustable coaxiality coupling device of the present invention uses upper and lower spherical arc surface workpieces. The lower sliding arc pad (10) and upper sliding arc pad (11) slide in cooperation with the upper and lower spherical arc surfaces of the chuck (22) on the lifting cage (9). When the lifting cage (9) and the valve stem (1) are not coaxial, the bushing (8) will move freely in the chuck (22) with the valve stem (1). Since there is a gap (18) of 0.04 to 0.08 mm between the upper sliding arc pad (11) and the pad (12), and the diameter of the chuck (22) is 1 to 2 mm larger than the outer diameter of the bushing (8), the gap ensures that the valve stem (1) can slide freely in the chuck (22), and the coaxiality is adjusted at any time to eliminate the different axial stress generated at the connection between the lifting cage (9) and the valve stem (1). The coaxiality adjustment component of the device of the present invention has a simple structure, low manufacturing cost, and is easy to maintain and replace. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention.

[0012] Figure 2 Enlarged view of the coaxiality adjustment device

[0013] Figure 3 for Figure 1 Top view Detailed Implementation

[0014] like Figure 1As shown, an adjustable coaxial coupling device is described. The valve stem 1 passes through the central hole 20 of the valve body. The gland fastening bolts 4 secure the packing ring gland 6 to the valve body 2. The gland fastening bolts 4 also press the sealing packing ring 3 into the packing chamber 21. Bolts 7 secure the lifting cage sliding sleeve base 5 to the valve body 2. Figure 3 As shown, the lifting cage 9 is installed inside the lifting cage sliding sleeve 16, with a clearance fit between the lifting cage 9 and the lifting cage sliding sleeve 16. The upper part of the lifting cage 9 is equipped with a lifting cage traction rod 17, as shown. Figure 2 As shown, the lower part of the lifting cage 9 has a chuck 22, and each of the upper and lower end faces of the chuck 22 has a spherical arc surface 23. The bushing 8 is fitted onto the valve stem shaft diameter 19, and the lower surface of the bushing 8 is in close contact with the shaft shoulder 24. The outer side of the bushing 8 is sequentially installed with a sliding arc washer 10, a chuck 22, an upper sliding arc washer 11, a washer 12, and a spring washer 13. The nut 14 is fitted with the valve stem thread 15, and the washer 12 is pressed tightly against the upper surface of the bushing 8. When the lifting cage 9 presses down to tighten the valve stem 1, A gap 18, ranging from 0.04 to 0.08 mm, is provided between the upper sliding arc shim 11 and the shim 12. The diameter of the chuck 22 is 1 to 2 mm larger than the outer diameter of the bushing 8. The spherical arc surfaces on the upper and lower parts of the chuck 22 have the same arc dimensions as those on the lower sliding arc shim 10 and the upper sliding arc shim 11. This gap ensures that the valve stem 1 can slide freely in the chuck 22, maintaining coaxiality at all times and eliminating the axial stress difference generated at the connection between the lifting cage 9 and the valve stem 1. The components for adjusting coaxiality in this device have a simple structure, low manufacturing cost, and are easy to maintain and replace.

Claims

1. An adjustable coaxiality coupling device, characterized by: Valve stem (1) from the valve body center hole (20) through, gland fastening bolt (4) will be packing gland (6) fastening on the valve body (2), gland fastening bolt (4) will be sealing packing ring (3) pressed in packing chamber (21), bolt (7) will be lifting cage sliding sleeve base (5) fastening on the valve body (2), lifting cage (9) is installed in lifting cage sliding sleeve (16), lifting cage (9) and lifting cage sliding sleeve (16) both clearance fit, lifting cage (9) upper part has lifting cage traction rod (17), lifting cage (9) lower part has a chuck (22), chuck (22) upper and lower end face each has a spherical arc surface (23), bushing (8) is sleeved on the valve stem shaft diameter (19), valve stem (1) is provided with shaft shoulder (24), bushing (8) lower plane close to shaft shoulder (24), bushing (8) outside in turn installs lower sliding arc gasket (10), chuck (22), upper sliding arc gasket (11), gasket (12) and spring washer (13), valve stem (1) upper end is provided with valve stem threaded rod, nut (14) is matched with valve stem threaded rod (15), gasket (12) is pressed to the upper plane of bushing (8), when lifting cage (9) is pressed down valve stem (1), upper sliding arc gasket (11) and gasket (12) between have gap (18).

2. The adjustable coaxiality coupling device of claim 1, wherein: The value of gap (18) is 0.04 to 0.08mm.

3. The adjustable coaxiality coupling device of claim 1, wherein: The diameter of chuck (22) is 1 to 2mm larger than the outer diameter of bushing (8).

4. The adjustable coaxiality coupling device of claim 1, wherein: The spherical arc surface of chuck (22) upper and lower is same as the spherical arc surface arc size of lower sliding arc gasket (10) and upper sliding arc gasket (11). The spherical arc surface of chuck (22) upper and lower is same as the spherical arc surface arc size of lower sliding arc gasket (10) and upper sliding arc gasket (11).

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