JP4127932B2 - Butterfly valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a butterfly valve, and more particularly, to an improvement in means for fixing a rotational position of a valve body in a butterfly valve whose valve casing is configured to be assembled and disassembled without using a tool.
[0002]
[Prior art]
In general, a butterfly valve is a valve that opens and closes a pipe by rotating a generally disc-shaped valve body around its valve shaft, and a valve casing that houses the valve body has a cross-section with an inner diameter equal to the diameter of the valve body. It has a circular cylindrical shape.
[0003]
In particular, in the butterfly valve provided in the middle of the powder conveyance pipe, a ring packing is fitted on the inner peripheral surface of the valve casing, and this ring packing abuts on the periphery of the disc-shaped valve body as a valve seat. The function of.
[0004]
In particular, when food powder or chemical powder is handled as the conveying powder, it is important to clean the pipeline and the butterfly valve from the viewpoint of hygiene. In particular, valve devices with complicated shapes that tend to retain powder tend to retain old powder. For complete cleaning, they are removed from the pipeline and further disassembled, and every part is cleaned. It is desirable to do.
[0005]
As a butterfly valve suitable for such an application, a butterfly valve disclosed in Japanese Utility Model Publication No. 3-26354 is known. In this butterfly valve, in order to make it easy to replace the ring packing, the valve housing divided into two parts and the connecting part of the valve housing are assembled so as to be assembled and disassembled without using a tool. The clamp member to be used is used. The ring packing is fitted on the inner peripheral surface of the connecting portion of the valve housing. When the valve housing is disassembled, it is exposed at the end surface and can be easily replaced.
[0006]
The valve shaft is eccentric from the center line of the rotation axis of the valve body. The valve shaft extends outside through one of the divided valve housings, and an opening / closing operation lever member is attached to one end thereof. A base for supporting the boss portion of the lever member is fixed at a position where the valve shaft penetrates the valve housing. On the other hand, a click ball urged by a spring is disposed in the boss portion of the lever member, and the position of the lever member is determined by inserting the click ball into a click groove (fitting recess) formed on the gantry side. Is configured to be stably supplied. That is, the opening degree of the valve body can be adjusted to the fully open position, the fully closed position, and the intermediate position therebetween.
[0007]
[Problems to be solved by the invention]
By the way, in the structure in which the position of the valve body is stabilized by fitting the click ball and the click groove as described above, the force to stabilize the valve body in the stop position is insufficient if the strength of the spring that biases the click ball is weak. If it is too strong, an excessive force is required to rotate the valve element with the lever member.
[0008]
The present invention is a butterfly valve that is easy to assemble and disassemble when cleaning and replacing the ring packing, and requires excessive force to rotate the valve element with the lever member. Therefore, an object of the present invention is to provide a butterfly valve having a mechanism suitable for adjusting the opening degree of the valve body so that the valve body can be sufficiently stabilized at the stop position.
[0009]
[Means for Solving the Problems]
The butterfly valve according to the present invention is a butterfly valve that opens and closes a pipe line by rotating a generally disc-shaped valve body around its valve shaft, and is attached to each other so that the valve shaft is sandwiched and assembled. The valve casing is composed of two connectable cylindrical bodies, the valve casing is divided into two parts, the clamp member that surrounds and fastens the outer periphery of the connection part of the two cylindrical bodies, and the inner peripheral surface of the valve casing. A ring-shaped seal member that contacts the peripheral edge of the valve body in the closed position, and the valve shaft has one end penetrating the valve casing and the clamp member and projecting outside the casing. Is attached to the disk-shaped valve body so as to rotate together with the valve shaft and to indicate the rotational position of the valve body. Valve with pin member The pin member is further slidable in the axial direction in the valve body position display means, and is urged toward one side in the axial direction. A bearing portion that pivotally supports the valve shaft is formed at a location where the extension portion of the valve shaft penetrates, and the urging force of the valve body position display means is formed on the surface of the bearing portion. The tip of the pin member abuts, and a hole is formed in which the tip of the pin member is inserted in accordance with at least two positions of the valve element open position and closed position, and the pin member is detached from the surface of the bearing portion. Alternatively, it is further provided with an engagement release means for pulling out from the hole.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a front view of a butterfly valve according to the present invention, and FIG. 2 is a rear view thereof. FIG. 3 is a side view of the butterfly valve of FIGS. 1 and 2. 4 is a view showing a longitudinal section passing through the center as viewed from the side surface opposite to FIG. In both cases, the valve body is shown in the open position.
[0011]
In the figure, reference numerals 11 and 12 respectively denote divided casings, and these divided casings 11 and 12 are combined to constitute a valve casing 10 of a butterfly valve. Each of the divided casings 11 and 12 has a substantially cylindrical shape, and is provided with flange-like joint portions 13, 14, 15 and 16 at both ends of the cylinder. A stepped portion is provided on both abutting surfaces of the joint portions 13 and 14 facing each other of the split casings 11 and 12 so as to form an annular recess on the inner peripheral surface into which the ring packing 17 having a substantially rectangular cross section can be fitted. ing. Further, the valve shaft 21 is inserted into the ring packing 17 at both ends of the valve body 20, and in this state, the divided casings 11 and 12 are joined and coupled so that the valve shaft 21 is sandwiched between the ring packing insertion portions. That is, the joint portions 13 and 14 facing each other of the split casings 11 and 12 are formed with semicircular openings that sandwich the valve shaft 21 at both upper and lower ends by being joined to each other. In this way, the mutual positioning of the divided casings 11 and 12 can be reliably performed by sandwiching the valve shaft 21 and fitting the ring packing 17 therebetween.
[0012]
And both the split casings 11 and 12 have the outer flange part of both joint parts 13 and 14 in the state which the said ring packing 17 was mounted | worn with the inner peripheral surface side of both joint parts 13 and 14 which is the coupling | bond part. The clamp member 30 having a pair of upper and lower semicircular arms 31 and 32 fitted from the outer peripheral direction is tightened and coupled in the axial direction of the valve casing 10.
[0013]
More specifically, the open / close clamp 30 serving as a clamp member includes a pair of upper and lower arms 31 and 32 having a semicircular shape having a concave portion that matches a trapezoidal cross-sectional shape obtained by abutting the outer flanges of the joint portions 13 and 14. ing. One end portions of the arms 31 and 32 are connected to each other by a hinge portion 33 so as to be freely opened and closed. On the other end portion of one arm (upper arm) 31, a bolt 35 screwed with a screw nut 34 is rocked by a pin 36. A U-shaped groove 37 into which the bolt 35 fits in the swinging direction is formed at the other end portion of the other arm (lower arm) 24 while being movably attached, and the joint portion 13 of the divided casings 11 and 12 is formed. , 14 is fitted into the pair of arms 31, 32 from the outer peripheral direction, the bolt 35 is fitted into the groove 37, and the screw nut 34 is tightened, so that both the joint portions 13, 14 are formed in the recesses of the pair of arms 31, 32. The outer flange is tightened in the axial direction via the ring packing 17 so as to be integrally coupled. The semicircular openings formed in the butt joint portions 13, 14 to support the lower end of the valve shaft 21 at the lower ends of both the divided casings 11, 12 are covered by the lower arm 32 of the clamp member 30. Needless to say, the vertical relationship of the fastening portion may be reversed so that the screw nut 34 and the bolt 35 are attached to the lower arm 32 to form the U-shaped groove 37 in the upper arm 31.
[0014]
By the way, the outer joint portions 15 and 16 of the divided casings 11 and 12, that is, the joint portions on the opposite side to the joint portions 13 and 14 that become the butt coupling portions of the two divided casings 11 and 12, are the mating joint portions of the pipeline. Needless to say, it matches the shape of the joint. In the present embodiment, the joint portion is formed into a flange shape and the abutting surface is a flat surface having the annular groove 18 to be fitted to the annular convex portion of the mating joint portion of the pipeline.
[0015]
The upper end of the upper arm 31 of the clamp member 30 is provided with a shaft support portion 38 that is formed so as to protrude upward and pass through the extending portion 22 of the valve shaft 21. The valve shaft support portion 38 has a flat upper end surface, and a flange-shaped enlarged diameter portion 39 is formed around the upper end. The extension portion 22 of the valve shaft 21 extends further upward than the upper end surface of the valve shaft support portion 38, and as will be described later, a pin member that allows or restricts the rotation of the valve body 20 and the valve body 20 An index member having a display knob for displaying the rotation position, and an opening / closing lever member are attached. The extension portion 22 of the valve shaft 21 has a circular cross section so that the portion inserted into the shaft support portion 38 can rotate, but the further upper portion passing through the shaft support portion 38 is inserted there. Thus, the member to be attached has a rectangular cross section so as to rotate together with the valve shaft 21.
[0016]
On the valve shaft support portion 38, an index member 50 is provided so as to be inserted into the valve shaft extending portion 22 and slidably contact the upper end surface of the shaft support portion 38. The index member 50 has an arcuate surface facing the outer peripheral surface of the enlarged-diameter portion 39 of the shaft support portion 38, and is slidably protruded by being biased from the arc-shaped surface toward the outer peripheral surface of the enlarged-diameter portion 39. A moving pin member 51 is incorporated. The pin member 51 is oriented so that its axial direction is parallel to the disc surface of the valve body 20, and the tip of the pin member 51 is pressed against the outer peripheral surface of the diameter-enlarged portion 39 of the valve shaft support portion 38. The proximal end portion on the opposite side is connected to a display knob 52 provided outside the index member 50 (in the axial direction of the pin member 51). When the tip of the pin member 51 is pressed against the outer peripheral surface of the enlarged diameter portion 39 of the valve shaft support portion 38, the rotation of the index member 50 and the valve shaft 21 is regulated by friction, and the opening degree of the valve body 20 is relatively large. In addition, the user can know the opening position of the valve body 20 from the position of the display knob 52.
[0017]
A groove extending in the radial direction of the pin member 51 is formed at a position on the surface where the index member 50 receives the display knob 52, and the display knob 52 formed in a linear convex portion so as to be fitted in this groove. The display knob 52 is pulled into the index member 50 by fitting one end into the groove, and the distal end portion of the pin member 51 is pressed against the outer peripheral surface of the enlarged diameter portion 39 of the valve shaft support portion 38. The other end of the display knob 52 is an enlarged diameter portion that can be picked as a knob. The enlarged diameter portion is picked and the display knob 52 is pulled out toward the outside of the index member 50, so that the linear convex portion is removed from the groove. When the display knob 52 is further rotated around the axis, the linear convex portion intersects with the groove, and the display knob 52 can be held in the pulled-out position. That is, when the display knob 52 is pulled out toward the outside of the index member 50, the tip end portion of the pin member 51 is detached from the outer peripheral surface of the enlarged-diameter portion 39 of the valve shaft support portion 38 and the index member 50 and the valve shaft 21. Is allowed to rotate. Therefore, the opening degree of the valve body 20 can be changed with a relatively small force.
[0018]
Further, the outer peripheral surface of the enlarged diameter portion 39 of the valve shaft support portion 38 is a locking hole (corresponding to the closed position) into which the tip of the pin member 51 is fitted at each position corresponding to the open position and the closed position of the valve body 20. Although the locking hole 53 is illustrated, the locking hole 54 corresponding to the open position is shown in FIG. 4 with the pin member 51 inserted therein, and the pin member 51 is formed at each position. Is inserted into the locking holes 53 and 54 to prevent the index member 50 and the valve shaft 21 from rotating, thereby stabilizing the position of the valve body 20. At an intermediate position between the open position and the closed position of the valve body 20, the display knob 52 can be pulled out of the index member 50 or pulled into the index member 50, as described above. The opening degree of the valve body 20 can be changed with a relatively small force when the display knob 52 is pulled out, and the opening degree of the valve body 20 is maintained relatively stably when the display knob 52 is retracted. . Further, the index member 50 rotates on the outer peripheral surface of the enlarged diameter portion 39 and comes into contact with the side surface of the index member 50 when the index member 50 reaches each position corresponding to the open position and the closed position of the valve body 20. Stopper pins 55 and 56 that prevent rotation are implanted.
[0019]
An opening / closing lever 60 for rotating the valve body 20 is inserted into the upper end of the extending portion of the valve shaft 21 and fixed with a thumbscrew 61. The position of the opening / closing lever 60 coincides with the position of the display knob 52. Therefore, in this configuration example, the opening position of the valve body 20 can also be known from the position of the opening / closing lever 60. However, the opening position of the valve body 20 can always be known from the position of the display knob 52 even when the opening / closing lever 60 is removed because it may get in the way of the work space. It can also be operated with only a lever or other handle attached. That is, the function of indicating the opening position of the valve body 20 on the handle is not necessary, and the function can be configured to purely rotate the valve shaft 21. As an example of such a case, a handle with two arms extending in a Y-shape or T-shape is more likely to give a rotational force than a lever with a single arm, or a wheel-shaped handle is more powerful. Easy to enter and easy to operate.
[0020]
In the butterfly valve configured as described above, when the thumbscrew 61 at the upper end of the extension part of the valve shaft 21 is removed and the display knob 52 of the index member 50 is pulled out, the opening / closing lever 60 and the index member 50 are connected to the valve shaft extension part. 22, and when the wing nut 34 of the clamp member 30 is loosened and the bolt 35 is removed from the U-shaped groove 37 to open the clamp member 30, the clamp member 30 can be easily removed from the valve casing 10, The valve casing 10 is disassembled into two divided casings 11 and 12 so that the valve body 20 and the ring packing 17 can be easily taken out. Therefore, the ring packing 17 can be easily replaced, and the inside of the valve can be easily and reliably cleaned, which is very convenient as a powder butterfly valve. Of course, it can be easily understood that the assembly is also simple.
[Brief description of the drawings]
FIG. 1 is a front view of a butterfly valve according to the present invention.
FIG. 2 is a view of the butterfly valve of FIG. 1 as viewed from the back.
FIG. 3 is a side view of the butterfly valve of FIG. 1;
4 is a view showing the butterfly valve of FIG. 1 in a vertical cross section passing through the center when viewed from the side opposite to that of FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Valve casing 11 Split casing 12 Split casing 13 Joint part 14 Joint part 15 Joint part 16 Joint part 17 Ring packing 18 Ring groove 20 Valve body 21 Valve shaft 22 Valve shaft extension part 30 Clamp member 31 Upper arm 32 Lower arm 33 Hinge Portion 34 Wing nut 35 Bolt 36 Pin 37 U-shaped groove 38 Shaft support 39 Expanded portion 50 Index member 51 Pin member 52 Display knob 53 Locking hole 54 Locking hole 55 Stopper pin 56 Stopper pin 60 Opening / closing lever 61 Butterfly screw

Claims (1)

A butterfly valve that opens and closes a pipeline by rotating a generally disc-shaped valve body (20) around its valve shaft (21),
A two-divided valve casing (10) comprising two cylindrical bodies (11, 12) that can be connected to each other so that the valve shaft (21) is sandwiched and assembled;
A clamp member (30) for surrounding and fastening the outer periphery of the connecting portion of the two cylindrical bodies (11, 12);
A ring-shaped seal member (17) fitted on the inner peripheral surface of the valve casing (10) and in contact with the peripheral edge of the valve body (20) in the closed position;
One end of the valve shaft (21) passes through the valve casing (10) and the clamp member (30) and protrudes out of the casing, and an extension portion (22) to which a handle (60) is attached is attached to one end. )
The extension part (22) of the valve shaft (21) is arranged in parallel with the disc-shaped valve body so as to rotate together with the valve shaft (21) and to indicate the rotational position of the valve body (20). A valve body position display means (50) having a pin member (51) formed;
The pin member (51) is slidable in the axial direction in the valve body position display means (50), and is biased toward one side in the axial direction,
In the clamp member (30), a bearing portion (38) that pivotally supports the valve shaft (21) is formed at a location where the extension portion (22) of the valve shaft (21) penetrates,
The tip of the biased pin member (51) of the valve body position display means (50) contacts the surface of the bearing portion (38), and the tip of the pin member (51) is the valve body (20 ) To be inserted in accordance with at least two positions of the open position and the closed position (53, 54),
Engagement holding means for holding the valve body (20) in the open position or the closed position by inserting the pin member (51) into the holes (53, 54) is formed,
The pin member (51) is further disengaged from the surface of the bearing portion (38), or further provided with an engagement release means (52) for pulling out from the hole portion (53, 54)
The handle (60) is configured to be separable from the engagement holding means and the valve body position display means (50), and the valve shaft (21) extends through a screwing fixing member (61). Even if the handle (60) is removed from the extension part (22), the engagement holding means and the valve body position display means (50) are connected to the handle (60). Is a butterfly valve characterized by functioning independently .

Images