JP2013148121A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a valve element in a valve device to be assembled to a base supporting the same without complication of any structure of the valve device while the play therebetween is minimum.SOLUTION: A valve device includes a base having a mounting part for a tubular body and a shaft part, a valve element having a bearing part of the shaft part and turnably assembled to the base, and provided with a lid part for closing one end of the tubular body at the pre-turn position, and a torsional coil spring 30 for accumulating the urging force to the valve element by the turn of the valve element from the pre-turn position. A holding recess 123a is formed, which is provided with a distal wall part 123c and a pair of holding wall parts 123d, 123d capable of introducing a coil part 31 of the spring 30 into the base from the side opposite to the drawing side of arm parts 32, 33 of the spring 30, and brought into contact with an outer circumferential part of the introduced coil part 31.

Description

  The present invention relates to a valve device that closes one end of a tubular body in a valve-closed state.

  The valve body of the backflow prevention valve is combined so as to be rotatable with respect to the valve opening, and the urging force of the torsion coil spring is applied to the valve body in order to maintain the closed state of the valve opening. There is a valve. (See Patent Document 1) In such a valve, a shaft that is supported by a pair of bearing portions formed on the valve port side is provided on the valve body side, and the shaft between the pair of bearing portions is provided as described above. Such a spring is provided in the valve by passing it through the coil portion of the torsion coil spring. However, in this method, since the spring is attached using the shaft of the valve body, that is, the rotation shaft of the valve body, there is no flexibility in the installation position of the spring.

JP 2009-67388 A

  The main problem to be solved by the present invention is that this type of valve device can be easily and appropriately assembled with a torsion coil spring that applies a biasing force to the valve body constituting the valve device.

In order to achieve the above object, according to the present invention, a valve device is provided with a base provided with a mounting portion for a tubular body,
A valve body which is combined with the base so as to be pivotable, and has a lid portion which closes one end of the tubular body at a position before the pivoting;
A valve device configured to include a torsion coil spring that stores an urging force against the valve body by rotation from a position before the valve body rotates;
The coil portion of the spring can be introduced into the base from the side opposite to the pulling side of the arm portion of the spring, and a back wall portion and a pair of sandwiching wall portions that are in contact with the outer peripheral portion of the introduced coil portion, respectively. The provided holding recess was assumed to be formed.

  The coil portion of the spring introduced from the entrance of the holding recess is sandwiched between the pair of sandwiching wall portions and is in contact with the back wall portion. As a result, the spring can be combined with the base, that is, the valve device, simply by storing the coil portion of the spring in the holding recess of the base. Such a holding recess of the base can be formed when the base is constructed by injection molding of a synthetic resin. Therefore, after the base and the valve body are molded simultaneously as an injection molded product of the synthetic resin, the spring is attached thereto. It is also possible to configure the valve device easily and appropriately.

  The holding recess is further preferably provided with a side wall portion facing one end portion of the introduced coil portion and a side wall portion facing the other end portion of the coil portion. Moreover, it is preferable that the back side of the holding recess and the back side of the pair of holding wall portions be configured by an arcuate surface along a virtual circular arc that is substantially equal to the outer diameter of the coil portion. The other one. Further, it is another preferred embodiment that an arm lead-out portion with respect to the valve body in the spring is formed on one of the pair of holding wall portions of the holding recess. Further, it is still another preferred embodiment that a fixing portion of the arm portion with respect to the base of the spring is formed in front of the entrance of the holding recess.

  According to the present invention, a torsion coil spring that applies an urging force to a valve body constituting the valve device is easily and appropriately applied to the valve device from a state in which the valve body is rotatably combined with a base that supports the torsion coil spring. Can be assembled.

FIG. 1 is a side view showing a state in which a valve device according to an embodiment of the present invention is attached to a pipe body, and the valve body is in a closed state. FIG. 2 is a cross-sectional view showing a state where the valve device is attached to the pipe body, and the valve body is in a valve open state. FIG. 3 is a cross-sectional view showing a state where the valve device is attached to the pipe body, and the valve body is in a closed state. FIG. 4 is a perspective view of the valve device. FIG. 5 is an enlarged view of a main part of FIG. FIG. 6 is a perspective view showing the valve device as viewed from a direction different from FIG. FIG. 7 is an enlarged view of a main part of FIG. FIG. 8 is a fragmentary perspective view of the valve device. FIG. 9 is an enlarged view of a main part of FIG. FIG. 10 is a fragmentary perspective view of the valve device viewed from a direction different from that in FIG. FIG. 11 is an enlarged view of a main part of FIG. FIG. 12 is a side view of the valve device. FIG. 13 is a plan view of the valve device. FIG. 14 is a rear view of the valve device. FIG. 15 is a front view of the valve device. FIG. 16 is a cross-sectional view of the main part at the position AA in FIG. 17 is a cross-sectional view taken along the line BB in FIG.

  Hereinafter, typical embodiments of the present invention will be described with reference to FIGS. The valve device V according to this embodiment closes one end of the pipe body P in the closed state. In the illustrated example, the valve device V opens the lower end Pa when the fluid flows out from the lower end Pa of the tubular body P with the lower end Pa open, and the lower end Pa when the outflow stops. It can be used as a backflow prevention valve for fuel or the like. Such a valve device V is formed by combining a base 1 and a valve body 2.

  The base 1 includes an attachment portion 10 and a shaft portion 11 for the tube body P. In the illustrated example, the base 1 has a rectangular plate-like portion 12, the attachment portion 10 on one surface side of the rectangular plate-like portion 12, and the shaft portion 11 on the other surface side.

  In the illustrated example, the attachment portion 10 is configured as a hollow body protruding from the center of the rectangular plate-like portion 12. The mounting portion 10 has a substantially rectangular cross-sectional outline in a direction perpendicular to the protruding direction. Further, engaging claws 10a are formed on the side portions facing each other across the center of the attachment portion 10, respectively. And in this embodiment, it is an attachment part from the outer side of the tubular body P with respect to the attachment hole Pb which followed the said cross-sectional outline shape of the attachment part 10 formed in the side part by the side of the lower end Pa of the tubular body P. When 10 is inserted, the pair of engaging claws 10a and 10a are elastically deformed in contact with the edge of the mounting hole Pb to allow this insertion, and the insertion of the rectangular plate-like portion 12 on the outer surface of the tube P is completed. The engaging claw 10a is elastically restored at the position, and is caught in the mounting hole Pb inside the tube body P. (FIG. 3, FIG. 4, FIG. 9) Thereby, in this embodiment, the valve device V can be attached to the lower end Pa portion of the tubular body P with one touch. In the illustrated example, protrusions 120 are formed on both sides of the rectangular plate-like portion 12 along the length direction of the tubular body P, and the rectangular plate-like portion 12 has a circular cross-sectional shape in the attached state. On the other hand, the protrusions 120 are in contact with each other at two positions on the left and right sides of the mounting portion 10. In addition, the attachment part 10 is sufficient as long as it has a structure that can be attached to the tubular body P, and is not limited to the structure shown in the figure.

  In the illustrated example, the shaft portion 11 has a cylindrical shape, and is formed at two positions on the left and right sides on the other surface side of the rectangular plate-like portion 12. In the illustrated example, a direction perpendicular to the other surface of the rectangular plate-like portion 12 is set such that a wall surface runs along the substantially central portion of both sides of the rectangular plate-like portion 12 where the protrusion 120 is formed. A side wall portion 121 is formed so as to protrude from the side. The outer wall surface of the side wall 121 is flush with the side. The shaft portion 11 projects in a direction perpendicular to the outer surface, with one end of the shaft integrally connected to the outer surface of the side wall portion 121. The center line of the left and right shaft portions 11 forms part of the same virtual straight line (indicated by symbol x in FIG. 5, hereinafter referred to as the first straight line). The center line of the left and right shaft portions 11 does not necessarily have to be part of the same virtual straight line.

  On the other surface side of the rectangular plate-like part 12, between the left and right side wall parts 121, 121, intersects the first straight line x at the center of the rectangular plate-like part 12 at right angles to the first straight line x. A central wall 122 is formed along an imaginary straight line (indicated by reference numeral x ′ in FIG. 5, hereinafter referred to as a second straight line). The central wall portion 122 has a protruding dimension from the rectangular plate-like portion 12, that is, a height larger than that of the side wall portion 121.

  Of the wall upper end 122a of the central wall 122, the position where the first straight line x and the second straight line x ′ intersect, and the wall side end directed downward in the state of attachment to the tubular body P in the central wall 122 The portion positioned between the two portions 122b is formed so as to substantially follow an arc of a virtual circle (not shown) surrounding the shaft center line of the shaft portion 11 with the shaft portion 11 as a center. Yes. In the illustrated example, the wall upper end 122a and the wall side end 122b function as a guide portion 13 described later.

  Further, in the illustrated example, the left and right side wall portions 121 and 121 and the central wall portion 122 are respectively the same height as the side wall portion 121 and the reinforcing wall portions formed along the first straight line x. 123 is integrated.

  On the other hand, the valve body 2 has a bearing portion 20 of the shaft portion 11 of the base 1 and is rotatably combined with the base 1 and closes the lower end Pa of the tubular body P at a position before the rotation. A lid 21 is provided.

  In the illustrated example, the valve body 2 includes the lid portion 21, a base portion 22 on which the bearing portion 20 is formed, and an arm portion 23 that connects the base portion 22 and the lid portion 21.

  The lid portion 21 of the valve body 2 has a disk shape and has a size capable of closing the lower end Pa of the tubular body P. That is, the lid 21 is configured so that one surface thereof is in close contact with the lower end Pa of the tubular body P at the position before the rotation.

  The base portion 22 extends between the short side 22a positioned below, the long side 22b positioned above the short side 22a, the short side 22a and the long side 22b, and the middle in the vertical direction at the position before the rotation. Are formed in the shape of a mountain plate having left and right side sides 22c and 22c inclined downward from the position by the dimensional difference between the short side 22a and the long side 22b. It is integrated. The left bearing portion 20 has an outer peripheral portion integrally connected to the left end of the long side 22 b of the base portion 22, and the right bearing portion 20 has an outer peripheral portion integrally connected to the right end of the long side 22 b of the base portion 22. The left side wall 121 of the base 1 is positioned inside the left bearing 20 and the shaft 11 is accommodated in the bearing 20, and the base 1 is placed inside the right bearing 20. The valve body 2 and the base 1 are combined in a state where the right side wall portion 121 is positioned and the shaft portion 11 is accommodated in the bearing portion 20.

  One end of the arm portion 23 is integrally connected to the center of the other surface of the lid portion 21, and the other end of the arm portion 23 is located at the center position of the short side 22 a on the one surface side of the base portion 22 that is directed downward at the position before the rotation. Are connected together. The length direction of the arm portion 23 is orthogonal to one surface of the base portion 22, whereby the valve body 2 has a lever shape as a whole in a side view.

  In the middle of the left and right bearings 20, 20 in the valve body 2, in the illustrated example, at the center of the long side 22 b of the base 22, the short side 22 a side is opened on both sides of the base 22 and on the long side 22 b side. A recess 22d is formed in the recess. The left-right dimension of the recess 22d is slightly larger than the thickness of the central wall portion 122 of the base 1, and the central wall is located in the recess 22d within a range in which the valve body 2 rotates by a predetermined angle from the position before rotation. The portion 122 is accommodated, and the inner back portion of the recess 22d is slid on the guide portion 13 which is a portion formed so as to substantially follow an arc of a virtual circle centering on the shaft portion 11 in the central wall portion 122. It comes to be touched. In this embodiment, the inner back portion of the recess 22d functions as a sliding contact portion 24 with respect to the guide portion 13. That is, in this embodiment, the guide portion 13 has a convex shape, and the sliding contact portion 24 has a concave shape that receives the convex guide portion 13.

  In this embodiment, the sliding contact portion 24 of the valve body 2 slidably contacted in this way and the guide portion 13 of the base 1 cooperate with the shaft portion 11 to rotate the valve body 2. The movement is made regular.

  That is, in this embodiment, the inner diameter of the bearing portion 20 of the valve body 2 is larger than the outer diameter of the shaft portion 11 of the base 1, but the valve body 2 is rotated by a predetermined angle from the pre-rotation position. In the moving range, the shaft portion 11 is in contact with the inner wall of the bearing portion 20, and the sliding contact portion 24 is in contact with the guide portion 13 on the outside of the shaft portion 11. (Figure 2)

  Thereby, in this embodiment, even when there is a dimensional difference between the shaft portion 11 and the bearing portion 20, the valve body 2 can be rotated regularly without rattling. When the valve returns from the valve-opened state to the pre-rotation position, the lower end Pa of the tubular body P can be appropriately closed by the lid portion 21 of the valve body 2. Further, in this embodiment, the guide portion 13 has a convex shape and the sliding contact portion 24 has a concave shape for receiving it, so that the valve body in the axial direction of the shaft portion 11 by the cooperation of the both. The movement of 2 is restricted, and the play in this direction is minimized.

  In the illustrated example, a mold component such as a slide core (not shown) that moves the base 1 and the valve body 2 in the axial direction of the shaft portion 11 between the bearing portion 20 and the shaft portion 11 is omitted. ), The inner diameter of the bearing portion 20 and the outer diameter of the shaft portion 11 are set so that a gap can be formed in a state where the shaft portion 11 is housed in the bearing portion 20. Further, the outer surface of the side guide portion 13 of the base 1 and the inner surface of the bearing portion 20 of the valve body 2 are also formed by mold constituent members that are movable in a direction orthogonal to the axial direction of the shaft portion 11. Therefore, if the sliding contact portion 24 and the guide portion 13 are not provided, the valve body 2 may be rattled when rotating in the direction intersecting the axial direction of the shaft portion 11 of the base 1 and in the axial direction. Such rattling is suppressed by the guide unit 13. As a result, in this embodiment, the base 1 and the valve body 2 can be molded simultaneously as a synthetic resin injection-molded product without hindrance.

  Further, in this embodiment, the valve device V includes the torsion coil spring 30 as the urging means 3 that stores the urging force against the valve body 2 by the rotation of the valve body 2 from the position before the rotation. I have. As a result, in this embodiment, the state in which the lid portion 21 of the valve body 22 closes the lower end Pa of the pipe body P can be more reliably created and stabilized by the biasing force of the biasing means 3. Can be maintained.

  In this embodiment, the coil portion 31 of the spring 30 can be introduced into the base 1 from the side opposite to the pull-out side of the arm portions 32 and 33 of the spring 30 and the introduced coil portion. A holding recess 123a having a rear wall portion 123c and a pair of sandwiching wall portions 123d and 123d that are respectively in contact with the outer peripheral portion of 31 is formed.

  In the example shown in the drawing, a holding recess 123 a for receiving the coil portion 31 of the spring 30 is formed on one of the reinforcing wall portions 123 formed on the left and right sides of the central wall portion 122 of the base 11. The holding recess 123a is provided with an inlet 123e on the side facing downward in the attached state, that is, behind the valve body 2 in the pre-rotation position, and the coil portion 31 is placed inside through the inlet 123e. It is configured to fit. The back wall 123c faces the entrance 123e, and the clamping wall 123d is between the entrance 123e and the back wall 123c. In the illustrated example, the upper and lower inner walls of the holding recess 123a function as the sandwiching wall portion 123d.

  Specifically, the spring 30 includes an arm portion 33 with respect to the valve body 2 drawn from one end 34 of the coil portion 31 and an arm portion with respect to the base 1 drawn from the other end 35 of the coil portion 31. The two arm portions 32 and 33 are drawn out toward one side across a virtual straight line y that bisects the coil portion 31 in the front-rear direction perpendicular to the winding center axis of the coil portion 31. . (Fig. 9)

  A fixing portion 122c of the arm portion 32 with respect to the base 1 of the spring 30 is formed in front of the entrance 123e of the holding recess 123a. In the illustrated example, a fixing portion 122c protruding from the central wall portion 122 toward the side wall portion 121 is formed below the central wall portion 122 of the base 1, and the arm portion 32 of the spring 30 with respect to the base 1 is fixed. It is stored between the portion 122c and the other surface of the rectangular plate-like portion 12, and is hooked on the fixing portion 122c.

  Further, in one of the pair of holding wall portions 123d and 123d of the holding recess 123a, in the illustrated example, an upper holding wall portion 123d is formed with a lead-out portion 123b of the arm portion 33 with respect to the valve body 2 in the spring 30. . In the illustrated example, a slit communicating with the holding recess 123a is formed at the upper end of the reinforcing wall portion 123, and this slit functions as the lead-out portion 123b. The slit is opened at the entrance 123e of the holding recess 123a and continues from the entrance 123e to a position directly above the back wall 123c. The lead-out portion 123b is located immediately above the one end portion 34 of the coil portion 31. A long side 22b of the base portion 22 of the valve body 22 is formed with a fastening portion 22e having a groove shape for receiving an arm portion 33 with respect to the valve body 2 in the spring 30 pressed against the long side 22b from above.

  In the illustrated example, when the valve body 22 is in the pre-rotation position, the arm portion 33 of the spring 30 with respect to the valve body 2 protrudes forward from the entrance 123e of the holding recess 123a. (FIGS. 8 to 11) When the valve body 2 is rotated from the pre-rotation position, the arm portion 33 of the spring 30 with respect to the valve body 2 enters the lead-out portion 123b in the process. Then, by the movement of the arm portion 33 with respect to the valve body 2 in the spring 30 due to the rotation of the valve body 2, the coil portion 31 of the spring 30 is elastically deformed to return the valve body 22 to the pre-rotation position. Is stored in the spring 30.

  The coil portion 31 of the spring 30 introduced from the entrance 123e of the holding recess 123a is sandwiched by a pair of sandwiching wall portions 123d and 123d and is in contact with the back wall portion 123c. Thereby, in this embodiment, the spring 30 can be provided on the base 1, that is, the valve device V, only by placing the coil portion 31 of the spring 30 in the holding recess 123 a of the base 1. The holding recess 123a of the base 1 can be formed when the base 1 is formed by synthetic resin injection molding. Therefore, the base 11 and the valve body 22 can be simultaneously formed as a synthetic resin injection molded product as described above. After molding, the valve device V can be configured by combining the spring 30 with the spring 30 easily and appropriately.

  In this embodiment, between the long side 22b of the base portion 22 of the valve body 2 and the reinforcing wall portion 123 of the base 1 in a state where the valve body 2 is positioned at the pre-rotation position (see FIG. 5). Further, the coil portion 31 of the spring 30 can be introduced into the holding recess 123a. When the coil portion 31 is placed in the holding recess 123a, the arm portion 33 of the spring 30 with respect to the valve body 2 is placed in the fastening portion 22e. Thereafter, the valve body 2 is rotated to a position where the valve body 2 is not positioned in front of the fixing portion 122c, and the arm portion 32 of the spring 30 with respect to the base 1 is hooked on the fixing portion 122c, thereby the base 1 and the valve body. 2 is completed.

  In this embodiment, the holding recess 123a has a side wall portion 123f facing the one end portion 34 of the introduced coil portion 31 and a side wall portion 123f facing the other end portion 35 of the coil portion 31. I have. That is, in this embodiment, the distance between the left and right side wall portions 123f and 123f in the holding recess 123a is substantially equal to or slightly larger than the total length of the coil portion 31 of the spring 30. Thereby, in this embodiment, the inner surface of the holding recess 123a is in contact with the coil portion 31 of the spring 30 received in the holding recess 123a from five directions except for the entrance 123e, The spring 30 is combined with the base 1 with little backlash.

  In this embodiment, the back wall 123c and the back side of the pair of sandwiching walls 123d and 123d in the holding recess 123a are formed into a virtual circular arc substantially equal to the outer diameter of the coil portion 31. It is constituted by the arcuate surface 123g along. Accordingly, the back side of the back wall portion 123c and the pair of sandwiching wall portions 123d and 123d are brought into contact with the coil portion 31 of the spring 30 in a wide range.

  In the example described above, the shaft 11 is provided on the base 11 and the bearing 20 is provided on the valve body 22. However, the bearing is provided on the base 11 and the shaft is provided on the valve 22. You can also. In this case, typically, the shaft portion is provided so as to protrude outward on the left and right sides of the valve body 22, and the formation portion of the shaft portion of the valve body 22 is formed between the left and right walls formed on the base 11. Bearing portions that are accommodated and accommodate the shaft portions on the sides corresponding to the left and right walls are provided.

P Tube 1 Base 10 Attaching part 11 Shaft part 123a Holding recess 123c Back wall part 123d Holding wall part 2 Valve body 20 Bearing part 21 Lid part 30 Torsion coil spring 31 Coil part 32, 33 Arm part

Claims (5)

A base with an attachment to the tube,
A valve body which is combined with the base so as to be pivotable, and has a lid portion which closes one end of the tubular body at a position before the pivoting;
A valve device configured to include a torsion coil spring that stores an urging force against the valve body by rotation from a position before the valve body rotates;
The coil portion of the spring can be introduced into the base from the side opposite to the pulling side of the arm portion of the spring, and a back wall portion and a pair of sandwiching wall portions that are in contact with the outer peripheral portion of the introduced coil portion, respectively. A valve device comprising a holding recess provided.   The valve device according to claim 1, wherein the holding recess includes a side wall portion facing one end portion of the introduced coil portion and a side wall portion facing the other end portion of the coil portion.   The back side of the back wall portion and the pair of holding wall portions in the holding recess is formed by an arcuate surface along a virtual circular arc that is substantially equal to the outer diameter of the coil portion. The valve device according to claim 2.   The valve device according to any one of claims 1 to 3, wherein a lead-out portion of an arm portion with respect to the valve body in the spring is formed on one of the pair of holding wall portions of the holding recess. .   The valve device according to any one of claims 1 to 4, wherein a fixing portion of an arm portion with respect to a base of the spring is formed in front of the entrance of the holding recess.

Images