On-off valve

Abstract

To provide an on-off valve capable of being easily assembled.SOLUTION: An on-off valve includes: a valve main body 2 in which a fluid flow channel 6 is formed inside; a valve element 3 which is provided inside the valve main body 2 for opening and closing the flow channel 6; a valve stem 4 with a handle on which a handle 18 for rotating the valve element 3 around an axis is integrally formed and which is inserted to the valve main body 2 and is mounted on the valve element 3; and a snap pin 5 which is engaged with the valve stem 4 with the handle to prevent the valve stem 4 with the handle from slipping out of the valve main body 2, or the on-off valve includes: the valve main body 2; the valve element 3; and the valve stem 4 with the handle, wherein a slot 20 along a flowing direction of the flow channel 6 in a state of closing the flow channel 6 by the valve element 3, is formed on the valve element 3, a projection portion 22 fitted to the slot 20 is formed on an end portion of the valve stem 4 with the handle, and an extending direction of the handle 18 formed on the valve stem 4 with the handle and an extending direction of the projection portion 22 are orthogonal to each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an on-off valve provided in a fluid flow path. [Background technology]

[0002] As shown in Patent Document 1 below, for example, an on-off valve used in a fluid flow path may have a configuration including a body 12 having flow paths 17, 18, and 19 formed therein, a ball valve element 30 for switching between these flow paths 17, 18, and 19, an operating shaft 24 provided on the ball valve element 30, and a handle 25 for manually rotating this operating shaft 24. In this configuration, when assembling the on-off valve, the handle 25 is fixed to the operating shaft 24 by an appropriate means such as a fixing pin 26 (see especially paragraphs 0024 to 0027 and Figure 1 of Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-139010 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration shown in Patent Document 1, when assembling the on-off valve, the handle and the operating shaft must be fixed together, which increases the number of work steps.

[0005] Therefore, an object of the present invention is to provide an on-off valve that can be easily assembled. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides: a valve body having a fluid flow path formed therein; a valve element provided inside the valve body for opening and closing the flow path; a valve stem with a handle integrally formed therewith for rotating the valve element about an axis, the valve stem being inserted through the valve body and attached to the valve element; a snap pin that engages with the valve stem with handle to prevent the valve stem with handle from coming off the valve body; An on-off valve having the above structure was constructed.

[0007] This eliminates the need to fasten the handle and operating shaft, making it easy to assemble the on-off valve. Furthermore, the use of a snap pin to prevent the handle and valve shaft from coming loose further simplifies assembly.

[0008] In the above on-off valve, It is preferable that an insertion hole into which the snap pin is inserted is formed in a boss portion of the valve body through which the handle-equipped valve stem is inserted.

[0009] In this way, the snap pin inserted into the insertion hole and the valve stem with handle engage at right angles, so that the snap pin exerts a high prevention effect against coming out.

[0010] In the on-off valve having the insertion hole, It is preferable that the boss portion is formed with a rotation prevention portion that extends along the axial direction of the valve stem with handle and abuts against the handle to limit the rotation angle of the valve stem with handle around its axis within a predetermined angle range.

[0011] In this way, the boss portion, which was thinned in the axial direction due to the formation of the insertion hole, can be thickened by the thickness of the anti-rotation portion, thereby improving the rigidity of the boss portion. Furthermore, when assembling the on-off valve, each part can be incorporated into the valve body using the anti-rotation portion as a guide, improving work efficiency.

[0012] In the on-off valve having the anti-rotation portion, It is preferable that the insertion hole and the anti-rotation portion overlap in the axial direction.

[0013] In this way, it is possible to reinforce the vicinity of the insertion hole, where the rigidity is particularly likely to decrease.

[0014] In the on-off valve having the insertion hole, It is preferable that the insertion hole has a pillar portion formed from the inner wall on one side of the insertion hole in the axial direction to the inner wall on the other side, and that the pillar portion can abut against the snap pin when the snap pin is inserted into the insertion hole.

[0015] This improves the rigidity of the boss, especially in the vicinity of the insertion hole. Furthermore, by allowing the post and snap pin to abut against each other, the insertion depth of the snap pin into the insertion hole can be restricted to a predetermined depth, and the sliding contact between the post and snap pin prevents the snap pin from falling out of the insertion hole.

[0016] In each of the above on-off valves, It is preferable that the valve body has a long hole formed in the flow direction of the flow path when the valve body closes the flow path, and that the end of the valve stem with handle has a protrusion that fits into the long hole, and that the extension direction of the handle and the extension direction of the protrusion are perpendicular to each other.

[0017] This allows the valve disc to tilt slightly relative to the valve stem with the handle when pressed against the valve seat by fluid pressure in the closed state. This tilt further improves the sealing performance between the valve disc and the valve seat. Moreover, because the extension direction of the handle is perpendicular to the direction of the flow path in the closed state, it is easy to visually recognize that the on-off valve is in the closed state.

[0018] In order to solve the above problems, the present invention provides: a valve body having a fluid flow path formed therein; a valve element provided inside the valve body for opening and closing the flow path; a valve stem with a handle integrally formed therewith, which rotates the valve body around an axis; The valve body has an elongated hole formed in the flow direction of the flow path when the valve body closes the flow path, and a protrusion that fits into the elongated hole is formed at the end of the valve stem with the handle, so that the extension direction of the handle and the extension direction of the protrusion are perpendicular to each other to form an on-off valve.

[0019] This eliminates the need to fix the handle and operating shaft, simplifying assembly of the on-off valve. Furthermore, when the valve disc is in the closed state, it can be slightly tilted relative to the valve shaft with the handle when pressed against the valve seat by the pressure of the fluid. This tilting further improves the sealing performance between the valve disc and the valve seat. Furthermore, by orthogonally extending the handle and the protrusion, the extension direction of the handle is orthogonal to the direction of the flow path in the closed state, making it easier to visually recognize that the on-off valve is in the closed state. [Effects of the Invention]

[0020] According to the above-described configuration of the present invention, it is possible to provide an on-off valve that can be easily assembled. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a cross-sectional view showing a first embodiment of an on-off valve according to the present invention; [Figure 2] A perspective view of the on-off valve shown in Figure 1, seen from downstream above. [Figure 3] 3 is a perspective view of the on-off valve shown in FIG. 1 as seen from a downstream upper side different from that shown in FIG. 2. [Figure 4] FIG. 2 is a perspective view of the valve shown in FIG. 1 with a portion cut away. [Figure 5] FIG. 2 is an exploded perspective view showing the valve stem with the handle and the valve body of the on-off valve shown in FIG. [Figure 6] Front view of the valve stem with handle of the on-off valve shown in Figure 1 [Figure 7]FIG. 2 is a partially cutaway perspective view showing another example of the main part of the on-off valve shown in FIG. 1; [Figure 8] FIG. 2 is a cross-sectional view showing another example of the main part of the on-off valve shown in FIG. 1. [Figure 9] FIG. 10 is a cross-sectional view showing a second embodiment of the on-off valve according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] A first embodiment of an on-off valve 1 according to the present invention will be described with reference to Fig. 1 to Fig. 6. Fig. 1 is a cross-sectional view of the on-off valve, and Figs. 2 and 3 are perspective views of the on-off valve. This on-off valve 1 has as its main components a valve body 2, a valve element 3, a valve stem 4 with a handle, and a snap pin 5.

[0023] A fluid flow path 6 is formed inside the valve body 2. An inlet 7 through which the fluid flows in is formed at one end (upstream side) of the flow path 6. A joint 9 having a flow path 8 formed therein is fixed with a bolt 10 to the other end (downstream side) of the flow path 6. The joint 9 has an outlet 11 through which the fluid flows out. A valve seat 12 on which the valve element 3 can be seated is provided at the upstream end of the flow path 8 formed in the joint 9. A sealing member 13 (O-ring) is provided between the valve body 2 and the joint 9 to ensure airtightness between them.

[0024] The valve body 2 is formed with a boss portion 14 having a through hole through which the valve stem with handle 4 is inserted. The boss portion 14 is formed with an insertion hole 15 through which the snap pin 5 is inserted, extending perpendicular to the axial direction of the valve stem with handle 4. This insertion hole 15 has openings on both the side surface of the boss portion 14 on which the snap pin 5 is inserted and on the side surface opposite to the insertion side.

[0025] As shown in Fig. 4, two pillar portions 16 (hereinafter referred to as a first pillar portion 16a and a second pillar portion 16b) are formed within the insertion hole 15, spanning from the inner wall on one side (the side closer to the flow path 6) of the insertion hole 15 in the axial direction to the inner wall on the other side (the side farther from the flow path 6). The first pillar portion 16a is formed at a position slightly recessed from the insertion side of the insertion hole 15 toward the through-hole side, and has a semicircular cross-sectional shape that is rounded on the insertion side. The second pillar portion 16b is formed on the opposite side of the through-hole from the first pillar portion 16a, and has a rectangular cross-sectional shape. The end faces of both pillar portions 16a, 16b on the through-hole side form a continuous surface with the through-hole.

[0026] The boss portion 14 is formed with a rotation prevention portion 17 extending along the axial direction of the handle-equipped valve stem 4. This rotation prevention portion 17 abuts against a handle 18 of the handle-equipped valve stem 4 and has the function of limiting the rotation angle of the handle-equipped valve stem 4 around its axis within a predetermined angle range. The shape of this rotation prevention portion 17 is designed so that the handle-equipped valve stem 4 can rotate 90 degrees around its axis. As shown in Figure 3, this rotation prevention portion 17 is formed to overlap with the insertion hole 15 in the axial direction.

[0027] The valve element 3 is a ball valve having a cylindrical flow path 19 formed therethrough that can communicate with the flow path 6 formed in the valve body 2. The valve element 3 is disposed inside the flow path 6 formed in the valve body 2 and has the function of opening and closing the flow path 6 by rotating around its axis. As shown in Figure 5, the surface of the valve element 3 facing the handle-equipped valve stem 4 has an elongated hole 20 formed along the flow direction of the flow path 6 when the valve element 3 closes the flow path 6 of the valve body 2.

[0028] As shown in FIG. 6, the handle-equipped valve stem 4 has a shaft portion 21 that is inserted into a boss portion 14 formed on the valve body 2 and attached to the valve element 3. A handle 18 for rotating the valve element 3 around its axis is integrally molded on the end of the shaft portion 21 that protrudes from the valve body 2 (boss portion 14). The outer diameter of the handle 18 is larger than that of the shaft portion 21. A protrusion 22 that fits into an elongated hole 20 formed in the valve element 3 is formed on the end of the shaft portion 21 opposite to the side on which the handle 18 is formed. The extension directions of the handle 18 and the protrusions 22 are perpendicular to each other. The shaft portion 21 is formed with a pin groove 23 into which a snap pin 5 is inserted and two circumferential grooves 25 in which O-rings 24 are provided. The outer diameter of the shaft portion 21 is larger near the pin groove 23 (see symbol d in FIG. 6) than near the circumferential groove 25 (see symbol D in FIG. 6) (D>d).

[0029] The snap pin 5 is a member made of an elastic material and has a bent portion 5a formed in a substantially U-shape, and an extended piece 5b extending from the bent portion 5a and having two outward bulges formed in two locations that sandwich the shaft portion 21 of the handle-equipped valve stem 4. When the snap pin 5 is inserted into the insertion hole 15 formed in the boss portion 14 of the valve body 2 while climbing over the retaining portion 26 formed at the insertion opening of the insertion hole 15, the bulged portion of the extended piece 5b of the snap pin 5 engages with the pin groove 23 formed in the shaft portion 21 of the handle-equipped valve stem 4, thereby exerting a retaining effect on the handle-equipped valve stem 4.

[0030] The snap pin 5 is formed so that, when inserted into the insertion hole 15, both its tip (extension piece 5b) and rear end (bent portion 5a) fit inside the maximum diameter of the boss portion 14. In addition, in this inserted state, the inside of the bent portion 5a abuts against the rounded portion of the first pillar portion 16a, and the inside of the tip of the extension piece 5b abuts against two opposing sides of the second pillar portion 16b.

[0031] In the on-off valve 1, the handle 18 and the stem 21 are integrated, which simplifies assembly. Furthermore, the snap pin 5 is used to prevent the valve stem 4 with the handle from coming off, further enhancing ease of assembly.

[0032] In the on-off valve 1 described above, the boss portion 14 is formed with an insertion hole 15 extending perpendicular to the axial direction of the valve stem 4 with handle, into which the snap pin 5 is inserted. Therefore, the snap pin 5 inserted into the insertion hole 15 engages with the valve stem 4 with handle so that the snap pin 5 is perpendicular to the valve stem 4 with handle, and this snap pin 5 exerts a high effect of preventing the valve stem 4 with handle from coming off.

[0033] In the on-off valve 1 described above, the anti-rotation portion 17 formed on the boss portion 14 overlaps with the insertion hole 15 in the axial direction, so that the vicinity of the insertion hole 15, where rigidity is particularly likely to decrease, can be reinforced intensively by the thick anti-rotation portion 17. Furthermore, even if a large external force is applied due to contact with the handle 18, damage to the vicinity of the boss portion 14 can be prevented.

[0034] In the on-off valve 1, the pillar portion 16 is formed within the insertion hole 15, thereby improving the rigidity of the vicinity of the insertion hole 15. In particular, in the above embodiment, the roundness of the first pillar portion 16a abuts against the inner side of the bent portion 5a of the snap pin 5, thereby restricting the insertion of the snap pin 5 into the insertion hole 15 to a predetermined depth. Furthermore, the two opposing sides of the second pillar portion 16b abut against the inner tip of the extension piece 5b, thereby generating friction between the second pillar portion 16b and the snap pin 5, preventing the snap pin 5 from falling out of the insertion hole 15. This ensures that the snap pin 5 can reliably retain the handle-attached valve stem 4. The number, shape, and arrangement of the pillar portions 16 in the above embodiment are merely exemplary and can be modified as appropriate. Furthermore, depending on the shape and size of the insertion hole 15, a configuration without the pillar portion 16 may be possible.

[0035] In the above-described on-off valve 1, the snap pin 5 is formed so that, when inserted into the insertion hole 15, both its tip (extension piece 5b) and rear end (bent portion 5a) are located inside the maximum diameter of the boss portion 14, so there is little risk of the snap pin 5 accidentally coming into contact with a hand or the like and falling off.

[0036] In the on-off valve 1 described above, the outer diameter of the handle 18 is larger than the outer diameter of the shaft portion 21, so that the hand is less likely to accidentally come into contact with the boss portion 14 when operating the handle 18, and this can prevent the snap pin 5 from falling off due to such contact. Also, the outer diameter of the shaft portion 21 is larger (D>d) near the pin groove 23 (see symbol d in FIG. 6) than near the circumferential groove 25 (see symbol D in the same figure), so that the rigidity near the pin groove 23 is improved and damage to the vicinity of the pin groove 23 can be prevented when a load from the snap pin 5 acts on the shaft portion 21.

[0037] In the on-off valve 1 described above, the valve element 3 is formed with an elongated hole 20 that aligns with the flow direction of the flow path 6 in a state in which the valve element 3 closes the flow path 6 of the valve body 2, and the extension direction of the handle 18 of the handle-equipped valve stem 4 and the extension direction of the protrusion 22 formed on the end of the stem portion 21 that fits into the elongated hole 20 formed in the valve element 3 are orthogonal to each other. Therefore, when the valve element 3 is in the closed state, the valve element 3 can be slightly inclined relative to the handle-equipped valve stem 4 when pressed against the valve seat 12 by fluid pressure. This inclination further improves the sealing performance between the valve element 3 and the valve seat 12. Moreover, because the extension direction of the handle 18 is orthogonal to the direction of the flow path 6 in the closed state, it is easy to visually recognize that the on-off valve 1 is in the closed state.

[0038] In the above embodiment, the extension pieces 5b extending from the bent portion 5a have two outward bulges (one on each extension piece 5b) that sandwich the shaft portion 21 of the handle-equipped valve stem 4. However, as shown in Fig. 7, it is also possible to form an outward bulge on only one extension piece 5b and make the other extension piece 5b straight. In this way, it is possible to reduce the processing cost associated with processing the other extension piece 5b, and also to reduce friction between the other extension piece 5b and the shaft portion 21, allowing for smooth rotation of the handle-equipped valve stem 4.

[0039] 8, the tip of each extension piece 5b can be bent inward, and the second pillar portion 16b can be made into a hook shape that engages with the bent tip portion of each extension piece 5b. In this way, the snap pin 5 once inserted into the insertion hole 15 engages with the second pillar portion 16b, making it very difficult to remove, and the snap pin 5 can reliably prevent the handle-attached valve stem 4 from coming out.

[0040] Furthermore, by forming a retaining portion 26 in the form of a protrusion that protrudes axially from the inner edge of the insertion hole 15 at the insertion opening for the snap pin 5, it is possible to reliably prevent the snap pin 5 inserted into the insertion hole 15 from falling out. After the snap pin 5 is inserted into the insertion hole 15, a spring pin or the like can also be inserted into a through-hole that extends axially and is formed in the boss portion 14 above the insertion opening, to serve as the retaining portion 26.

[0041] A second embodiment of an on-off valve 1 according to the present invention is shown in Figure 9. This on-off valve 1 has the same basic configuration as the on-off valve 1 according to the first embodiment, except that instead of using a snap pin 5 to prevent the handle-equipped valve stem 4 from coming off, it is secured by a locking member 27. This locking member 27 is not particularly limited, and can be any suitable member, for example, a plate-like member that fits perpendicularly to the axial direction onto a step formed on the stem 21 and is fixed to the boss 14. In the configuration according to the second embodiment, the handle 18 and stem 21 are integrated, making assembly of the on-off valve 1 easy.

[0042] The embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive. Therefore, the scope of the present invention is defined by the claims, not by the above description, and is intended to include meanings equivalent to the claims and all modifications thereof. [Explanation of symbols]

[0043] 1. On-off valve 2 Valve body 3 Valve body 4 Valve stem with handle 5 snap pins 5a Bend part 5b Extension piece 6 Flow path (of the valve body) 7 Inlet 8 (Joint) Flow path 9 Joints 10 volts 11 Outlet 12 Valve seat 13 Sealing member 14 Boss section 15 Insertion hole 16 Column 16a First pillar part 16b Second pillar part 17 Anti-rotation part 18 Handle 19 (Valve body) flow path 20 slots 21 Shaft 22 Protrusion 23 Pin groove 24 O-rings 25 Circumferential groove 26 Stopper 27 Locking member

Claims

1. a valve body (2) having a fluid flow path (6) formed therein; a valve element (3) provided inside the valve body (2) for opening and closing the flow path (6); a handle-equipped valve stem (4) that is inserted through the valve body (2) and attached to the valve disc (3), and that has a handle (18) integrally formed therewith for rotating the valve disc (3) about its axis; a snap pin (5) that engages with the valve stem (4) with handle to prevent the valve stem (4) with handle from coming off the valve body (2); and An insertion hole (15) into which the snap pin (5) is inserted is formed in a boss portion (14) of the valve body (2) through which the handle-equipped valve stem (4) is inserted, The boss portion (14) is formed with a rotation stopper portion (17) that extends along the axial direction of the handle-equipped valve stem (4) and abuts against the handle (18) to limit the rotation angle of the handle-equipped valve stem (4) around its axis within a predetermined angle range, An on-off valve in which the insertion hole (15) and the anti-rotation portion (17) overlap in the axial direction.

2. 2. The on-off valve according to claim 1, further comprising a pillar portion (16) formed within the insertion hole (15) from one inner wall of the insertion hole (15) to the other inner wall in the axial direction of the insertion hole (15), the pillar portion (16) being able to come into contact with the snap pin (5) when the snap pin (5) is inserted into the insertion hole (15).

3. 3. An on-off valve according to claim 1, wherein the valve body (3) is formed with an elongated hole (20) that is aligned with the flow direction of the flow path (6) when the valve body (3) closes the flow path (6), and the end of the handle-equipped valve stem (4) is formed with a protrusion (22) that fits into the elongated hole (20), and the extension direction of the handle (18) and the extension direction of the protrusion (22) are perpendicular to each other.

Images