阅读说明：本技术 一种用于压力辅助连接阀轴 (Valve shaft for pressure auxiliary connection ) 是由 陆瑾 于 2019-09-26 设计创作，主要内容包括：本发明公开了一种用于压力辅助连接阀轴,包括阀闭合构件具有封闭构件的孔内,并延伸出所述壳体的轴。在阀关闭构件的孔的内表面和轴的外表面之间形成一个或多个锁定孔,锁定孔从轴的轴线向外并且朝向轴的内端成角度。一个或多个锁定构件被插入到每个锁定孔中并与每个锁定孔接合,所述锁定构件将轴相对于阀关闭构件的位置固定,使得轴的旋转使阀旋转。闭合构件处于打开位置和闭合位置之间,并且使得来自阀壳体内部的内部压力增加了锁定构件与锁定孔之间的接合。(A shaft for a pressure assisted coupling valve includes a valve closure member having a bore enclosing a member and extending out of a housing. One or more locking holes are formed between an inner surface of the bore of the valve closure member and an outer surface of the shaft, the locking holes being angled outwardly from the axis of the shaft and toward the inner end of the shaft. One or more locking members are inserted into and engage each locking aperture, the locking members fixing the position of the shaft relative to the valve closure member such that rotation of the shaft rotates the valve. The closure member is between the open position and the closed position and such that internal pressure from inside the valve housing increases the engagement between the locking member and the locking aperture.)

1. A valve shaft for pressure assisted connection, comprising: a valve closure member in the valve housing; a shaft having a first end and a second end, the first end being received within the shaft receiving bore of the valve closure member and the second end extending out of the valve housing, one or more locking bores being defined by a first portion formed in an inner surface of the shaft receiving bore of the valve closure member and a second portion formed in an outer surface of the shaft, the locking bore extending axially and outwardly at an angle thereto, the axis of rotation of the shaft being oriented toward the first end of the shaft; and one or more locking members, each locking member being inserted into one of the locking holes and engaging with the first and second portions of the respective locking hole, the locking members fixing the position of the shaft relative to the valve closure member such that rotation of the shaft about the axis of rotation rotates the valve closure member between the open and closed positions and such that internal pressure from inside the valve housing increases the engagement between the locking members and the locking holes.

2. The valve of claim 1, comprising two or more locking apertures and two or more locking members.

3. The valve of claim 2, wherein the two or more locking holes are evenly spaced around the circumference of the shaft.

4. The valve of claim 1, further comprising a retainer threadably engaged with the shaft receiving bore and retaining the first end of the shaft.

5. The valve of claim 1, wherein an outer diameter of the first end of the shaft is smaller than an inner diameter of the shaft receiving bore such that the first end of the shaft is insertable through the shaft receiving bore and a locking member is inserted into a locking bore prior to insertion.

6. The valve of claim 1, wherein the one or more locking apertures are only accessible through the interior cavity of the valve housing when the shaft is received in the shaft receiving aperture.

7. The valve of claim 1, wherein the valve closure member is a ball valve.

8. A method of assembling a valve, comprising: inserting a valve closure member into a valve housing; inserting a first end of a shaft through the valve housing and the valve closure member such that the first end is received in the shaft receiving bore of the valve closure member, and a second end of the shaft extends out of the valve housing, and one or more locking members are mounted in one or more locking holes, each locking hole being defined by a first portion formed in an inner surface of the shaft receiving hole of the valve closing member and a second portion formed in an outer surface of the shaft, each locking hole extending along the axis of rotation of the shaft and toward the first end of the shaft and being inclined outwardly, wherein each locking member engages with the first and second portions of the respective locking aperture to fix the position of the shaft relative to the valve closure member, such that rotation of the shaft about the axis of rotation rotates the valve closure member between the open position and the open position, the internal pressure inside the valve housing increasing the engagement between the one or more locking members and the one or more locking apertures.

9. The method of claim 8, wherein the one or more locking holes comprise two or more locking holes and the one or more locking members comprise two or more locking members.

10. The method of claim 9, wherein the two or more locking holes are evenly spaced around a circumference of the shaft.

Technical Field

The invention relates to the technical field of control mechanisms of valves, in particular to a valve shaft for pressure-assisted connection.

Background

Rotary control valves are widely used in a variety of process control applications. The shaft is typically secured to the control member using a tapered pin or key inserted perpendicular to the shaft's centerline. It is desirable in control valve applications to have a shaft connection that does not allow any hysteresis. For a taper pin type connection, the shaft and control member must be installed in pairs. Tapered reamers are used to machine the correct size taper to match the taper pin. During assembly, the tapered pin is forcibly inserted into the tapered hole and effectively wedged into place. The tapered key uses tapered flats machined longitudinally into a round bar to form a semi-circular tapered pin. Assembling the shaft to the control member requires the key to be forcibly inserted and effectively wedged in place. Both designs rely on the wedging effect of the key or pin to remain in place. U.S. patent No. 4,768,750 (Wilson), entitled "valve coupling," is an example of a ball valve that uses a tapered wedge to lock a shaft to a valve member. It is not uncommon for these types of wedge pins to loosen under repeated cycling, particularly at higher torques.

Disclosure of Invention

According to one aspect, there is provided a valve comprising a valve closure member in a valve housing, a shaft having a first end and a second end, the first end being received within the shaft receiving bore of the valve closure member and the second end extending out of the valve housing, the one or more locking holes defined by a first portion formed in an inner surface of the shaft receiving bore of the valve closure member and a second portion formed in an outer surface of the shaft, the locking holes and the one or more locking members angled outwardly from an axis of the shaft toward the first end of the shaft, each locking member inserted into one of the locking holes and engaging the locking hole with the respective first and second portions, the locking members fixing the position of the shaft relative to the valve closure member, such that rotation of the shaft rotates the valve closure member between the open and closed positions and such that internal pressure from inside the valve housing increases the engagement between the locks.

According to another aspect, the valve may include two or more locking apertures and two or more locking members.

According to another aspect, the two or more locking holes may be evenly spaced about the circumference of the shaft.

According to another aspect, the valve may further include a retainer threadably engaged with the shaft receiving bore and retaining the first end of the shaft.

According to another aspect, the first end of the shaft may have an outer diameter that is smaller than an inner diameter of the shaft receiving hole such that the first end of the shaft may be inserted through the shaft receiving hole before the locking member. Inserted into the locking hole.

According to another aspect, the one or more locking apertures may be accessible exclusively via the interior cavity of the valve housing when the shaft is received within the shaft receiving aperture.

According to another aspect, the valve closure member may be a ball valve.

According to one aspect, there is provided a method of assembling a valve, the method comprising: inserting a valve closure member into a valve housing; the first end of the shaft is inserted through the valve housing and the valve closure member such that the first end is received within the valve. The shaft of the valve closure member receives the bore and extends the second end of the shaft out of the valve housing and mounts one or more locking members in one or more locking bores, each locking bore defined by a first portion formed therein. An inner surface of the shaft receiving bore of the valve closure member and a second portion formed in the outer surface of the shaft, each locking bore angled outwardly from the axis of the shaft toward the first end of the shaft, wherein each locking member engages the first and second portions of the respective locking bore to fix the position of the shaft relative to the valve closure member such that rotation of the shaft rotates the valve closure member between the open and closed positions and thereby causes internal pressure from within the valve housing to increase engagement between the one or more locking members and the one or more locking bores.

According to another aspect, the one or more locking holes may include two or more locking holes, and the one or more locking members may include two or more locking members.

According to another aspect, the two or more locking holes are evenly spaced around the circumference of the shaft.

According to another aspect, mounting the locking member may further include mounting a retainer that threadably engages the shaft receiving bore and retains the first end of the shaft.

According to another aspect, the first end of the shaft may have an outer diameter that is less than an inner diameter of the shaft receiving bore.

According to another aspect, the one or more locking apertures may be accessible exclusively via the interior cavity of the valve housing when the shaft is received within the shaft receiving aperture.

According to another aspect, the valve closure member may be a ball valve.

In other respects, those skilled in the art will recognize that the above features may be combined together in any reasonable combination.

Drawings

FIG. 1 is a perspective view of an unassembled valve closure member according to the present invention;

FIG. 2 is a side view of the valve closure member of FIG. 1;

FIG. 3 is a top cross-sectional view of the valve closure member of FIG. 1;

FIG. 4 is a front cross-sectional view of the valve closure member of FIG. 3;

FIG. 5 is a partial side cross-sectional view of the valve closure member in a closed position within the valve housing;

FIG. 6 is a partial side cross-sectional view of the valve closure member in a closed position within the valve housing.

Detailed Description

As shown in fig. 5, valve 10 is comprised of valve closure member 12, valve housing 14 and shaft 16. The shaft 16 has a first end 18 and a second end 20, wherein the first end 18 is received in a shaft receiving bore 22 of the valve closure member 12 and the second end 20 extends out of the valve housing 14. The valve 10 also preferably has a packing 23 as is known in the art to prevent leaking elements or other elements. The design shown below and discussed below has been developed for use with ball valves. However, it will be appreciated that this design may be adapted for use with other types of valves that open and close by rotating a closure member using a shaft.

As shown in fig. 4, a locking bore 24 is provided, the locking bore 24 being defined by a first portion 26 formed in an inner surface of the shaft receiving bore 22 and a second portion 28 formed in an outer surface of the shaft 16. The number of locking holes 24 provided will depend on the user's preference and the requirements of the application. However, as shown in FIG. 1, there may be a single locking hole 24. As shown in fig. 4, it is preferred that the two locking holes 24 be evenly spaced about the circumference 34 of the shaft 16. Although this design has many advantages, there may be more than two apertures 24, and the apertures 24 need not be evenly spaced. The locking aperture 24 receives a locking member 30 such that the locking member 30 engages both the first portion 26 and the second portion 28. It has been found that a design having two apertures 24 is convenient because it balances the design while minimizing the number of parts required and manufacturing requirements.

Referring to fig. 3, the locking apertures 24 are angled outwardly from the axis 32 toward the axis 16 toward the first end 18 toward the axis 16. Each locking hole 24 receives a locking member 30 that is inserted such that it engages the first and second portions 26, 26 and the respective locking hole 24. The locking member 30 fixes the position of the shaft 16 relative to the valve closure member 12 such that the valve closure member 12 is permitted to rotate between open positions, as shown in fig. 1. The closed position is shown in fig. 6, and the closed position is shown in fig. 6. In fig. 5, extends out of the valve housing 14 via the rotational axis 16. To maximize engagement between the aperture 24 and the locking member 30, the first portion 26 and the second portion 28 are preferably of equal size so that both locking members 30 participate equally. This may vary depending on the preference of the user and the design requirements, as long as the engagement is sufficiently secure to support the engagement between the shaft 16 and the valve closure member 12.

Referring to fig. 3, an internal pressure, indicated by an arrow, is applied from within the valve housing 14 to the first end 18 of the shaft 16, which increases the engagement between the locking member 30 and the locking member due to the angle of the locking aperture 24 and the locking member 30. And a hole 24. To ensure that the locking member 30 and shaft 12 do not move into the valve closure member 12 during shipping or assembly, or when internal pressure is not applied, the valve 10 may also have a retainer 36 that engages the shaft receiving bore 22 and retains the first end 18 of the shaft 16. As shown in fig. 1. As shown in FIG. 1, the retainer 36 may have threads 38 that engage threads 40 on the shaft receiving bore 22 to mount the retainer 36. It will be appreciated that the retainer 36 may be omitted, or replaced by another design.

Although the angles of the locking aperture 24 and the locking member 30 act to lock the shaft 16 relative to the valve closure member 12, the shaft 16 is designed such that the first end 18 may be mounted from outside the valve housing 14 with the valve closure member 16 positioned within the valve. In particular, the first end 18 of the shaft 16 is sized such that the outer diameter is smaller than the inner diameter of the shaft receiving bore 22. . This allows the first end 18 of the shaft 16 to be inserted through the shaft receiving bore 22 prior to inserting the locking member 30 into the locking bore 24. When the first end 18 of the shaft 16 is received within the shaft receiving bore 22, the locking bore 24 is accessible, and preferably only accessible, via the interior cavity 42 of the valve housing 14. In this way, the shaft 16 can be inserted into the valve closure member 12 from the outside and then secured in place by installing a locking member 30 that is angled to reduce the likelihood of a loose connection. Placing the locking hole 24 and the locking member 30 in this manner may allow the locking member 30 to be secured so that they do not fall into place when the shaft 16 is in place. The locking member 30, when it exerts pressure within the valve housing 14, is shown in fig. 5. This placement of the locking member 30 relative to the shaft 16 may also prevent the shaft 16 from being able to be forced out of the shaft receiving aperture. This may also be used to prevent the shaft 16 from being pushed out of the valve housing 14 when high pressures are involved.

The method of assembly of the valve 10 will now be described. Valve closure member 12 is inserted into valve housing 14 and first end 18 of shaft 16 is inserted through valve housing 14 and valve closure member 12 such that first end 18 of shaft 16 is received within shaft receiving bore 22 of valve closure member 12. And with the second end 20 of the shaft 16 extending from the valve housing 14. The locking member 30 is mounted in one or more locking holes 24. Refer to the figures. Referring to fig. 5, it can be seen that the locking aperture 24 may be sized and shaped such that the locking member 30 may be inserted only from the interior cavity 42 of the valve housing 14. Once inserted, the locking member 30 engages the first and second portions 26, 28 of the respective locking aperture 24. The position of the fixed shaft 16 relative to the valve closure member 12 such that rotation of the shaft 16 rotates the valve closure member 12 between the open positions, as shown in fig. 2. As shown in fig. 6, the closed position is shown in fig. 6. As shown in fig. 5, and causes internal pressure from within the valve housing 14 to increase the engagement between the locking member 30 and the locking aperture 24 to prevent a loose connection. Mounting the locking member 30 may also have the step of mounting the retainer 36. The first end 18 of the shaft 16 is retained, such as by threadingly engaging the shaft receiving bore 22.

In some embodiments, the first portion 26 of the locking bore 24 may be two rounded grooves machined 180 degrees apart from each other into the shaft-receiving bore 22 of the valve closure member 12. The second portion 28 of the locking hole 24 may be two identical radiused grooves machined longitudinally along the centerline of the shaft 16. So that they form a cylindrical bore when joined together. Although a circular cross-section is preferred, other cross-sectional shapes may be used. The depth of these grooves may vary along their length to form a taper. The slots may be identical and designed to allow the use of two simple circular pins as locking members 30. The taper of the rounded slot may be designed such that internal pressure, which naturally tends to move the shaft 16 outwardly from the valve closure member 12, will tighten the connection between the shaft 16 and the valve closure member 12. Rotating the shaft eliminates any hysteresis. In particular, although a loose-fit connection may have a range of motion in the shaft 16 before the valve closure member 12 moves, a tightened connection will cause the shaft 16 and valve closure member 12 to move together. The use of tapered slots that engage the shaft 16 and closure member 12 equally may also promote a secure, uniform connection. Preferably, the slots are shallow to minimize reduction in the cross-section of the shaft 16. High yield strength can be maintained. The wedging effect of the connection may also allow the entire length and diameter of each locking pin 30 to be engaged to evenly distribute the torque load and form a uniform connection. The retainer 36 may be used to prevent the shaft 16 from sliding inwardly when the valve 10 is not under pressure, such as during shipping or shipping.

In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. The reference to an element by the indefinite article "a" does not exclude the possibility that a plurality of elements is present, unless the context clearly requires that only one element is present.

The scope of the appended claims should not be limited by the preferred embodiments set forth in the above examples and drawings, but should be given the broadest interpretation consistent with the description as a whole.