JPH0355019Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a structure for connecting a yoke to a valve cover in a valve device.

[Conventional technology]

In valve devices, a drive device attached to the outside of the valve body is sometimes used to open and close the valve body housed in the valve body, and in such cases, the valve stem connected to the valve body passes through the valve cover attached to the valve box, is guided inside the yoke, and is connected to the drive device. For this reason, the yoke must be connected to the valve lid.

Conventionally, as a structure for connecting the yoke to the valve cover, a yoke nut type fixing means or a fixing means using a tightening bolt has generally been adopted.

[Problem that the invention attempts to solve]

However, in the conventional connection structure described above, the structure is complicated, the number of parts is increased, and the diameter has to be increased due to reasons such as the need to form flanges on the valve cover and yoke. There was a problem.

The present invention is intended to provide a yoke connection structure in a valve device that has a small number of parts, has a simple structure, and can reliably prevent the yoke from slipping off and rotating relative to the valve lid.

[Means for solving problems]

In the present invention, a fitting hole is formed at the lower end of the yoke, and a fitting convex portion that fits into the fitting hole is formed at the upper part of the valve lid, and an upward direction is formed on the outer surface of this fitting convex portion. Forms a tapered surface that spreads outward along the
An insertion hole extending in the direction intersecting the valve stem is provided in the yoke, an open part is formed in this insertion hole at a location opposite to the tapered surface, a lock pin is inserted into this insertion hole, and the side surface of this lock pin is formed into a flat surface. The flat surface of the lock pin faces the tapered surface from the opening of the insertion hole and comes into surface contact with the tapered surface, and the lock pin straddles and engages the insertion hole and the tapered surface, thereby closing the yoke. is connected to the valve lid.

[Effect]

According to the configuration of the present invention, not only the fitting protrusion formed on the upper part of the valve cover fits into the fitting hole formed at the lower end of the yoke, but also the flat surface of the lock pin inserted into the insertion hole of the yoke fits into the fitting hole formed at the lower end of the yoke. Since the open portion of the lock pin comes into surface contact with the tapered surface of the fitting convex portion, the lock pin engages across the insertion hole and the tapered surface, thereby connecting the yoke to the valve cover. Such a connection structure not only prevents the yoke and the valve lid from coming off in the axial direction, but also prevents them from rotating, so the connection between the two is reliable, and the structure is simple and can be realized with a reduced number of parts. Furthermore, since the flat surface formed on the side surface of the lock pin comes into surface contact with the tapered surface formed on the fitting convex portion, the contact area is large and mechanical strength is improved.

〔Example〕

The present invention will be explained below based on an embodiment shown in the drawings.

In FIG. 1, reference numeral 1 denotes a valve cover, and this valve cover 1 is fixed to a valve box 2, some of which are not shown, with tightening bolts 3. In addition, these valve lids 1
A gasket 4 is sandwiched between the valve housing 2 and the valve housing 2 to prevent leakage of fluid flowing through the valve housing 2. Further, a valve body 9 is housed inside the valve box 2, and the valve body 9 is connected to the valve stem 5. The valve rod 5 passes through a seal 6 and a seal retainer 7 housed inside the valve lid 1 and is guided into a yoke 8, and its upper end is connected to a drive device (not shown).

As shown in FIG. 2, a fitting convex portion 10 is formed at the upper end of the valve lid 1, and on both left and right sides of the outer surface thereof, there are tapered surfaces that increase in diameter as they approach the upper end. 11, 11 are processed.
As shown in FIG. 4, these tapered surfaces 11, 11 are tapered so as to widen from each other in the direction intersecting the valve stem 5.

As shown in FIG. 1, a fitting hole 12 is formed at the lower end of the yoke 8 to fit into the fitting convex portion 10. Extending insertion holes 14, 14 are formed. One side of each of these insertion holes 14, 14 is open to the inside of the fitting hole 12. Therefore, the part where the side of the insertion hole 14, 14 is open is a groove 13 with a semicircular cross section, 13. The opening in the grooves 13, 13 is the valve lid 1.
When the fitting protrusion 10 on the side is fitted into the fitting hole 12 on the yoke 8 side, it faces the tapered surfaces 11, 11 formed on the outer surface of the fitting protrusion 10.

Reference numeral 15 designates a lock pin, which has a threaded portion 16 formed on the insertion tip side as shown in FIG. In this embodiment, an axially tapered surface 17 is formed. This tapered surface 17 has a cut that becomes deeper as it approaches the insertion tip side.

As shown in FIG. 4, the insertion holes 14...
After inserting the lock pins 15, the nut 18 is screwed onto the threaded portion 16 of the lock pin 15 and tightened.

In such a configuration, the fitting protrusion 10 of the valve lid 1 and the fitting hole 12 of the yoke 8 are connected to the insertion hole 14.
They are interconnected by lock pins 15 inserted into... That is, when an axial force is applied between the valve cover 1 and the yoke 8, the lock pins 15, which are in contact with the outer surface of the valve cover 1 and the inner surface of the yoke 8, prevent the above-mentioned fitting. This prevents the mating protrusion 10 and the fitting hole 12 from shifting in the axial direction. Furthermore, since the fitting convex portion 10 and the tapered surfaces 11 and 17 of the lock pin 15 are in surface contact with each other, even if a force to rotate the yoke 8 in the circumferential direction is applied to the valve cover 1, the valve The yoke 8 is prevented from rotating relative to the lid 1. Therefore, the valve cover 1 and the yoke 8
Even if axial and circumferential forces are applied between the
A strong connection can be made.

In such a configuration, the fitting convex portion 10
The locking pin 15 is simply inserted into the insertion hole 14 formed across the outer surface of the fitting hole 12 and the inner surface of the fitting hole 12, so the number of parts is small and the structure is simple. , yoke 8 for valve cover 1
Can be reliably prevented from falling off and rotating.

Further, since the fitting convex portion 10 and the tapered surfaces 11 and 17 of the lock pin 15 are in surface contact,
Mechanical strength is significantly increased and thus reliability is also increased.

Moreover, no special flange or the like is required, and the valve cover 1 and yoke 8 can be configured compactly, which is effective in adopting a small valve device, and the number of parts is reduced, contributing to cost reduction.

Note that the present invention is not limited to the above embodiments. That is, the number and shape of the lock pins 15 are not limited to the above embodiments. For example, there may be only one lock pin 15, and the flat surface formed on the lock pin 15 is not limited to being tapered along the axial direction.

[Effect of idea]

According to the present invention described in detail above, the number of parts is small and the yoke can be reliably prevented from coming off and rotating relative to the valve lid with a simple structure, and the valve lid and the yoke can be configured compactly. Further, since the flat surface formed on the side surface of the lock pin and the tapered surface formed on the fitting convex portion come into surface contact, the contact area is increased, mechanical strength is improved, and reliability is increased.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional view of the valve device with some parts not shown; FIG. 2 is a front view showing a fitting convex portion; and FIG. 3 is a perspective view showing a lock pin. , FIG. 4 is a sectional view taken along the line - in FIG. 1. 1... Valve lid, 2... Valve box, 5... Valve stem, 8...
Yoke, 12... Fitting hole, 14... Insertion hole, 15
...Lock pin.

Claims (1)

[Scope of Claim for Utility Model Registration] In a valve device in which a yoke is connected to a valve cover attached to a valve box, and a valve stem led out by passing through the valve cover is inserted into the inside of the yoke, the lower end of the yoke In addition to forming a fitting hole, a fitting protrusion that is fitted into the fitting hole is formed in the upper part of the valve lid, and the outer surface of the fitting protrusion has a taper that extends outward along the upward direction. an insertion hole extending in a direction intersecting the valve stem is provided in the yoke, an opening is formed in the insertion hole at a location opposite to the tapered surface, a lock pin is inserted into the insertion hole, and the lock pin is inserted into the insertion hole. Form the sides of the flat surface,
The flat surface of the lock pin is brought into surface contact with the tapered surface by facing the opening of the insertion hole, and the lock pin straddles and engages the insertion hole and the tapered surface, thereby opening the yoke. A connection structure of a yoke in a valve device characterized by being connected to a lid.