JP2010024687A - Check valve and its installation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new check valve which is excellent in constructibility to be properly and easily installed in a pit even if the pipe of a riser portion is long and to provide an installation method for the check valve. <P>SOLUTION: The check valve 10 prevents the backflow of wastewater into an inflow port 102. The check valve is equipped with a valve seat 12, and installed in such a manner that an opening 14 of the valve seat faces the inflow port of the pit 100. For example, a bottom surface of the valve seat is formed in such a shape as to abut on the bottom of the pit, and the valve seat is provided with a valve body 24 for openably/closably closing the inner surface side of the opening. Additionally, a connecting portion 32 for connecting the valve seat and an abutting portion 34 together is formed in the upper portion of the valve seat, and a positional relationship between the valve seat and the abutting portion is fixedly maintained with the connecting portion. The abutting portion abuts on the inner surface of the riser portion 114 in the installation of the check valve in the pit, and regulates the direction of the valve seat with respect to the axial direction of the riser portion. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a backflow prevention valve and a method for installing the backflow valve, and more particularly to a backflow prevention valve and a method for installing the backflow valve that are used, for example, for a trough having a rising pipe portion and prevent backflow of drainage into an inflow port.

  Conventionally, in order to prevent drainage and bad odor due to drainage from entering the house, a technology for preventing a backflow of drainage from the outflow side to the inflow side in the tub by providing a backflow prevention valve at the bottom of the tub is known. It is.

  For example, Patent Document 1 discloses a backflow prevention device (backflow prevention valve) installed at an inflow side connection port of a public fence. The backflow prevention device is accommodated in the public tub from the upper end opening of the riser pipe (rise pipe part) by the support rod connected to the supported part. Then, one end side of the backflow prevention device is inserted and connected from the inflow side connection port to the inflow side connection pipe by the attachment device, whereby the backflow prevention device is fixedly installed in the public fence.

Further, Patent Document 2 discloses a backflow prevention valve installed in a further downstream pipe. The backflow prevention valve is lowered from the vertical pipe portion (rising pipe portion) of the kite by the support pipe fixed to the cylindrical portion of the support body and is arranged in the downstream pipe. And the stopper fixedly attached to the internal peripheral surface of a standing pipe part and the backflow prevention valve are connected, and, thereby, the backflow prevention valve is fixedly installed in the cage.
JP 2006-2835473 A [E03F 7/04] JP 2008-101396 A [E03F 5/10]

  However, in the technique of Patent Document 1, after performing the work of housing the backflow prevention device in a public fence, the dedicated attachment device is used to connect one end side of the backflow prevention device from the inflow side connection port to the inflow side connection port. The work of inserting and connecting to the tube must be performed, which takes time and effort.

  Moreover, in the technique of patent document 2, in order to install a backflow prevention valve fixedly in a cage | basket, after attaching the cylinder part of a support body to a downstream pipe | tube, it held the handle and made it the diameter-reduced state. The stopper must be lowered and fitted into the groove of the support. Similarly, in order to remove the backflow prevention valve from the further downstream pipe, after removing the stopper having a reduced diameter by grasping the handle, the cylindrical portion of the support body must be removed from the downstream pipe. . For this reason, for example, when the pipe length of the vertical pipe portion is long, it is difficult to expand and contract the stopper from the upper opening of the vertical pipe portion, and on the contrary, the stopper and therefore the backflow prevention valve cannot be attached. Furthermore, in the technique of Patent Document 2, after performing the operation of arranging the backflow prevention valve in the downstream pipe by the support pipe, it is necessary to further perform the operation of fitting the stopper described above into the groove portion of the backflow prevention valve, After all, the installation work takes time and effort.

  Therefore, a main object of the present invention is to provide a novel check valve and a method for installing the same.

  Another object of the present invention is to provide a backflow prevention valve excellent in workability and an installation method thereof.

  Still another object of the present invention is to provide a backflow prevention valve and a method for installing the backflow prevention valve that can be installed in the tub appropriately and easily even when the length of the rising pipe portion is long.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses, supplementary explanations, and the like indicate correspondence relationships with embodiments described later to help understanding of the present invention, and do not limit the present invention in any way.

  A first aspect of the present invention is a backflow prevention valve that is used in a trough having a rising pipe portion and prevents a backflow of drainage into the inflow port in the trough, having an opening facing the inflow port, and a lower end portion thereof Is provided on the valve seat that contacts the bottom of the rod, the valve body that opens and closes the opening, and contacts the inner surface of the rising pipe part to regulate the orientation of the valve seat relative to the axial direction of the rising pipe part It is a backflow prevention valve provided with the contact part and the connection part which hold | maintains the positional relationship of a valve seat and a contact part fixedly.

  In the first invention, the backflow prevention valve (10) is used for the dredger (100) having the rising pipe portion (114), and prevents the backflow of drainage into the inflow port (102) in the dredger. The backflow prevention valve includes a valve seat (12), and is installed in the basket so that the opening (14) of the valve seat faces the inflow port. For example, the valve seat is formed in a shape in which the lower end thereof is in contact with the bottom of the bag, and the valve seat is provided with a valve body (24) that closes the inner surface side of the opening so as to be freely opened and closed. In addition, a connecting portion (32) for connecting the valve seat and the contact portion (34) is formed in the upper portion of the valve seat, and the positional relationship between the valve seat and the contact portion is fixedly held by this connecting portion. Is done. The contact portion is a portion that comes into contact with the inner surface of the rising pipe portion when the check valve is installed on the ridge, and regulates the orientation of the valve seat with respect to the axial direction of the rising pipe portion.

  According to the first aspect of the present invention, once the backflow prevention valve is inserted into the upper opening of the rising pipe portion and the contact portion is brought into contact with the inner surface of the rising pipe portion once, the valve with respect to the axial direction of the rising pipe portion is provided. The backflow prevention valve can be installed on the bag as it is while the orientation of the seat is fixedly held. Therefore, it is not necessary to adjust the direction of the rising pipe portion of the backflow prevention valve with respect to the axial direction when the backflow prevention valve is pushed downward or thereafter, and the workability is excellent.

  A second invention is dependent on the first invention, and further includes a rotating means for adjusting the orientation of the valve seat with respect to the circumferential direction of the rising pipe portion.

  In the second invention, the backflow prevention valve (10) includes rotating means (36, 38) for adjusting the orientation of the valve seat (12) with respect to the circumferential direction of the riser pipe portion (114). By rotating the backflow prevention valve in the circumferential direction, the direction of the backflow prevention valve is adjusted so that the opening (14) of the valve seat and the inflow port (102) of the rod (100) face each other.

  A third invention is dependent on the second invention, and the rotating means includes a mounting portion formed in the connecting portion and an operation member mounted on the mounting portion.

  In the third invention, a mounting portion (36) is formed at the upper end opening edge of the connecting portion (32), and the operating member (38) is mounted on the mounting portion. For this reason, even from the upper opening of the rising pipe portion (114), the operation for pushing the backflow prevention valve (10) downward using the operation member and the work for rotating the backflow prevention valve in the circumferential direction are performed. be able to.

  According to the third aspect of the invention, even if the length of the riser pipe portion is long, the backflow prevention valve can be easily and appropriately installed from the upper opening of the riser pipe portion to the eaves.

  A fourth invention is dependent on any one of the first to third inventions, and the connecting portion is formed in a cylindrical shape along the inner surface of the rising tube portion.

  In the fourth invention, the connecting portion (32) is formed in a cylindrical shape along the inner surface of the rising tube portion (114). For this reason, the valve seat (12), the valve body (24), etc. in the ridge (100) can be visually inspected from the upper opening of the rising pipe portion without obstructing the view.

  According to the fourth aspect of the invention, it is possible to easily maintain and manage the backflow prevention valve.

  A fifth invention is dependent on any one of the first to fourth inventions, and the contact portion includes a first contact portion and a second contact portion, at least one of which is made of an elastic body, and the first contact portion is a valve seat. The second contact portion is provided at a position that receives a reaction force from the first contact portion.

  In 5th invention, a 1st contact part (34a) and a 2nd contact part (34b) are provided on the outer surface of a connection part (32). For example, the water stop member (22) extended from the outer surface of the valve seat (12) to the outer surface of the connecting portion is used for the first contact portion. In addition, for example, the second contact portion is formed in a vertically long rectangular plate shape, is provided on the opposite side of the position where the first contact portion is formed, and receives a reaction force from the first contact portion.

  According to 5th invention, the junction part of the valve seat of a backflow prevention valve and the inflow port of a soot can be sealed appropriately, and it can prevent that water leaks from the junction part.

  A sixth invention is dependent on the fourth or fifth invention, wherein the diameter of a circle passing through the outer surface of the first contact portion and the outer surface of the second contact portion is larger than the inner diameter of the rising tube portion, and is at least per first One of the part and the second contact part is compressed by the inner surface of the rising pipe part.

  In the sixth aspect of the invention, the diameter of the circle passing through the outer surface of the first contact portion (34a) and the outer surface of the second contact portion (34b) is larger than the inner diameter of the rising tube portion (114). When the prevention valve (10) is installed on the gutter (100), the contact portions (34, 34a) made of an elastic body are compressed by the inner surface of the rising pipe portion.

  A seventh aspect of the invention is a method of installing a backflow prevention valve in the bag by installing the backflow prevention valve according to any one of the third to sixth aspects of the invention, wherein (a) the backflow prevention valve is inserted from the upper opening of the rising pipe portion. (B) pushing the backflow prevention valve downward using the operation member to bring the lower end of the valve seat into contact with the bottom surface of the rod; and (c) using the operation member to turn the backflow prevention valve This is a method of installing a backflow prevention valve, which includes a step of rotating the valve seat in the circumferential direction so that the opening of the valve seat faces the inflow port of the bag.

  In the seventh invention, in step (a), the backflow prevention valve (10) is inserted from the upper opening of the rising pipe portion (114). In step (b), the backflow prevention valve (10) is pushed downward by the operating member (38) attached to the attachment portion (36), and the bottom surface of the backflow prevention valve and the bottom surface of the rod (100) are brought into contact with each other. Let In step (c), the backflow prevention valve is rotated in the circumferential direction by the operation member attached to the attachment portion, and the orientation of the valve seat (12) of the backflow prevention valve with respect to the circumferential direction of the rising pipe portion is adjusted. The opening (14) of the valve seat and the inlet (102) of the soot are made to face each other.

  According to this invention, since the backflow prevention valve can be installed in the bag while the orientation of the valve seat with respect to the axial direction of the rising pipe portion is fixedly held, the workability is excellent.

  Furthermore, according to the present invention, since the direction of the backflow prevention valve can be adjusted from the upper opening of the rising pipe section, the backflow prevention valve can be appropriately and easily installed even when the pipe length of the rising pipe section is long. Can be installed on the fence.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  1 and 2, a backflow prevention valve 10 according to an embodiment of the present invention is used in a dredger 100 having a rising pipe portion 114, and the reverse flow of drainage to the inlet 102 is conducted in the dredger 100. To prevent.

  Here, as shown in FIG. 2, the gutter 100 is a synthetic resin straight gutter having an inlet 102, an outlet 104, and an inspection port 106, and commercially available products are manufactured and sold by the applicant, for example. ST150-200 (product number 5409, refer to General Catalog No. C00-03 for Kubota Eye Eye Sewerage) can be used. In this trough 100, an inflow pipe 108 is connected to the inflow port 102, and an outflow pipe 110 is connected to the outflow port 104. Further, a vertical pipe 112 extending in the vertical upward direction is connected to the inspection port 106, and a rising pipe portion 114 in the basket 100 is configured. Here, the “rising pipe portion 114” in this embodiment is a concept including not only the vertical pipe 112 connected to the inspection port 106 but also an upward rising portion of the ridge 100.

  As shown in FIGS. 1 to 5, the backflow prevention valve 10 includes a valve seat 12, and is installed in the basket 100 so that the opening 14 in the valve seat 12 faces the inflow port 102.

  The valve seat 12 is made of a synthetic resin such as vinyl chloride, and has an outer surface that is curved along the inner surface of the flange 100 and a lower end portion that is in contact with the bottom surface of the flange 100.

  Specifically, the valve seat 12 includes a saddle portion 16 and a pipe portion 18, and the pipe portion 18 is formed integrally or by secondary processing on the inner surface side of the saddle portion 16. The saddle portion 16 has a shape in which the outer surface is curved along the inner surface of the flange 100, and a notch 20 is provided in the lower portion thereof. The pipe portion 18 is a pipe having an outer diameter at least equal to or larger than the inner diameter of the inflow pipe 108, and the outer surface of the pipe bottom abuts the bottom surface of the ridge 100. A part of the outer opening of the pipe part 18 is joined to the notch 20 of the saddle part 16, and the inner surface thereof is continuous with the notch 20, and is used as the opening 14 in the valve seat 12.

  A water stop member 22 made of an elastic body is provided on the outer surface of the valve seat 12. The water-stop member 22 is used to fill a gap between the valve seat 12 and the inlet 102 to ensure water-stop, and is made of, for example, sponge rubber (foam rubber) formed of silicon rubber or fluoro rubber. And is attached to the outer surface of the saddle portion 16 and the outer surface of the tube bottom in the tube portion 18. Moreover, the water stop member 22 is extended from the outer surface of the valve seat 12 to the outer surface of the connection part 32 formed in the upper part of the said valve seat 12, and the connection in the water stop member 22 is mentioned later for details. The part located on the outer surface of the part 32 functions as the contact part 34 (first contact part 34a).

  Further, the valve seat 12 is provided with a valve body 24 that closes the inner surface side of the opening 14 so as to be freely opened and closed.

  Specifically, the end face of the outer opening of the pipe part 18 is inclined toward the inner surface side of the saddle part 16 from the upper part toward the lower part, and the valve body 24 is attached to the upper part of the inclined end face 26 by a hinge 28 or the like. . The size of the valve body 24 is larger than the inner diameter of the inclined end surface 26, and the valve body 24 is usually placed on the inclined end surface 26 that faces obliquely upward due to gravity and closes the inclined end surface 26 of the pipe portion 18. When the inner surface of the valve body 24 is pushed from the inside of the pipe portion 18, the valve body 24 opens outward, and when the outer surface of the valve body 24 is pushed, the valve body 24 hits the tube wall of the pipe portion 18 and closes the inclined end face 26. A rubber packing 30 or the like is attached to the inner surface of the valve body 24.

  In addition, a connecting portion 32 that connects the valve seat 12 and the contact portion 34 is integrally formed on the upper portion of the valve seat 12 (saddle portion 16). The connecting portion 32 is made of a synthetic resin such as vinyl chloride, and is formed in a cylindrical shape along the inner surface of the rising tube portion 114, for example, and holds the positional relationship between the valve seat 12 and the contact portion 34 in a fixed manner.

  On the outer surface of the connecting portion 32, a contact portion 34 that comes into contact with the inner surface of the rising pipe portion 114 when the backflow prevention valve 10 is installed on the flange 100 is provided. The contact portion 34 is formed in a shape having a predetermined length in the axial direction of the rising tube 114, and thereby restricts the direction of the valve seat 12 with respect to the axial direction of the rising tube portion 114. In this embodiment, two contact portions 34 (a first contact portion 34a and a second contact portion 34b) are provided on the outer surface of the connecting portion 32. As described above, the first contact portion 34a includes the valve seat 12. The water-stop member 22 extended in the upper part of is used. The second contact portion 34b is formed in a vertically long rectangular plate shape with a synthetic resin such as vinyl chloride, and is provided on the opposite side of the position where the first contact portion 34a is formed, and the first contact portion 34a. Receive reaction force from. The contact portion 34 is provided so that the diameter of a circle passing through the outer surface of the first contact portion 34a and the outer surface of the second contact portion 34b is larger than the inner diameter of the rising tube portion 114. The first contact portion 34 a is compressed by the inner surface of the rising pipe portion 114 when the prevention valve 10 is installed on the bag 100.

  In addition, the upper end opening edge of the connecting portion 32 is formed with notches at two points facing each other in the diameter direction, and these notches are used as the mounting portion 36. An operation member 38 is mounted on the mounting portion 36 so that the backflow prevention valve 10 can move in the vertical direction and can rotate in the circumferential direction. The member 38 functions as a rotating means of the backflow prevention valve 10 for adjusting the orientation of the valve seat 12 with respect to the circumferential direction of the rising pipe portion 114.

  Here, as shown in FIG. 6, the operation member 38 is a long member made of a synthetic resin such as vinyl chloride. The operation member 38 includes a vertical member 40 formed in a cylindrical shape having a length corresponding to the tube length of the rising pipe portion 114, and a horizontal member 42 formed in a cylindrical shape having a length corresponding to the outer diameter of the connecting portion 32. The upper horizontal member 42a is formed at the upper end portion of the vertical member 40, and the lower horizontal member 42b is formed at the lower end portion of the vertical member 40, and has a substantially I-shape.

  1-5, the mounting portion 36 includes a first mounting portion 36a that extends downward from the upper end opening edge of the connecting portion 32, and a second portion that extends in the circumferential direction of the connecting portion 32 from the lower end of the first mounting portion 36a. The mounting portion 36b and the third mounting portion 36c extending in the vertical direction from the end portion of the second mounting portion 36b are configured, and the two mounting portions 36 are formed substantially in point symmetry with the center of the connecting portion 32 as a fixed point. The third mounting portions 36c are disposed at positions facing each other in the horizontal direction orthogonal to the axial direction of the opening 14 of the valve seat 12. For this reason, although the details will be described later, the direction of the lateral member 42 of the operation member 38 disposed in the third mounting portion 36c is set so that the opening 14 of the valve seat 12 of the check valve 10 and the inlet 102 of the rod 100 Can be used as a measure of whether or not the two are properly facing each other.

  With reference to FIGS. 7-9, the method of installing such a backflow prevention valve 10 in the bag 100 is shown below. However, it should be noted that the riser 112 is not shown in FIGS. 7 to 9 for simplification of the drawings.

  First, the backflow prevention valve 10 is inserted from the upper opening of the rising pipe portion 114 (vertical pipe 112), and the contact portion 34 is brought into contact with the inner surface of the rising pipe portion 114.

  Next, the operation member 38 is attached to the attachment portion 36 of the check valve 10. Specifically, as shown in FIGS. 7A and 7B, the lower side member 42b of the operation member 38 is moved from the first mounting portion 36a to the third mounting portion via the second mounting portion 36b. 36c is disposed below the third mounting portion 36c. As a result, the backflow prevention valve 10 can be moved downward by the operation member 38 and can be rotated in the circumferential direction.

  Then, as shown in FIG. 8, by holding the upper lateral member 42 a and pressing the operation member 38 downward, the backflow prevention valve 10 is pushed downward, and the bottom surface of the backflow prevention valve 10 and the flange 100 are Make contact with the bottom.

  Subsequently, as shown in FIG. 9, the orientation of the valve seat 12 of the backflow prevention valve 10 with respect to the circumferential direction of the rising pipe portion 114 is adjusted. Specifically, in a state where the lower lateral member 42b is disposed below the third mounting portion 36c of the backflow prevention valve 10, the upper lateral member 42a is gripped and the operation member 38 is rotated in the circumferential direction. The longitudinal direction of the upper lateral member 42 a of the operation member 38 is orthogonal to the axial direction of the inflow port 102 of the rod 100. Thereby, the backflow prevention valve 10 is arranged in a direction in which the opening 14 of the valve seat 12 and the inflow port 102 of the rod 100 face each other.

  Finally, the operation member 38 is removed from the mounting portion 36 of the backflow prevention valve 10 to complete the installation of the backflow prevention valve 10 on the bag 100 (see FIG. 2).

  When such a backflow prevention valve 10 is installed in the tub 100, the valve body 24 of the backflow prevention valve 10 closes the inclined end surface 26 in the pipe portion 18 of the valve seat 12 except when drainage flows into the tub 100. Then, when drainage flows from the inflow pipe 108 to the trough 100, the drainage flows into the pipe portion 18, pushes the inner surface of the valve body 24 to open the valve body 24, and flows out to the outflow pipe 110 through the inside of the trough 100. When the flow of the drainage stops again, the valve body 24 closes the inclined end face 26 in the pipe portion 18 of the valve seat 12. On the other hand, when drainage flows backward from the outflow pipe 110 into the tub 100 due to heavy rain or the like, the drainage pushes the outer surface of the valve body 24 and the valve body 24 closes the pipe portion 18 of the valve seat 12. The valve body 24 prevents drainage from flowing into the inflow pipe 108 and the house in front of the inflow pipe 108.

  Furthermore, when maintaining and managing such a backflow prevention valve 10, the valve seat 12 or the valve body 24 in the rod 100 is visually inspected from the upper opening of the rising pipe portion 114. Further, for example, when checking the inside of the pipe portion 18 in the valve seat 12 of the check valve 100, the check valve 10 may be removed from the bag 100 and checked. When removing the backflow prevention valve 10 from the bag 100, the operating member 38 is inserted into the rising pipe portion 114, and the lower lateral member 42b of the operating member 38 is connected from the first mounting portion 36a to the second mounting portion. The third mounting portion 36c is passed through the third mounting portion 36c and is disposed on the upper portion of the third mounting portion 36c. As a result, the backflow prevention valve 10 becomes movable by the operation member 38 in the upward direction. Then, as shown in FIG. 10, by holding the upper lateral member 42 a and pulling the operating member 38 upward, the backflow prevention valve 10 is moved upward, and the backflow prevention valve 10 is raised. Remove from the upper opening.

  Thus, according to this embodiment, the contact portion 34 is formed in the check valve 10, and the positional relationship between the contact portion 34 and the valve seat 12 is fixedly held by the connecting portion 32. For this reason, if the backflow prevention valve 10 is inserted into the upper opening of the rising pipe portion 114 and the contact portion 34 is brought into contact with the inner surface of the rising pipe portion 114 once, the valve with respect to the axial direction of the rising pipe portion 114 is In the state where the direction of the seat 12 is fixedly held, the backflow prevention valve 10 can be installed on the bag 100 as it is. Therefore, it is not necessary to adjust the direction of the rising pipe portion 114 of the backflow prevention valve 10 with respect to the axial direction when the backflow prevention valve 10 is pushed downward or thereafter, and the workability is excellent.

  In this embodiment, the backflow prevention valve 10 is provided with a mounting portion 36. By using the operation member 38 mounted on the mounting portion 36, the backflow prevention valve 10 is moved in the vertical direction and rotated in the circumferential direction. Can be made. For this reason, even from the upper opening of the rising pipe portion 114, the operation of pushing the backflow prevention valve 10 downward using the operation member 38, the operation of rotating the backflow prevention valve 10 in the circumferential direction, and the backflow prevention valve The work of removing 10 can be performed. Here, as described above, in the backflow prevention device inserted and connected to the inflow side connection pipe from the inflow side connection port of the public pole as disclosed in Patent Document 1, the riser pipe connected to the public pole When the pipe length of the (rising pipe section) is long, after performing the work of housing the backflow prevention device in a public fence, use a dedicated mounting device to connect the backflow prevention device from the inflow side connection port to the inflow side. Work to insert and connect to the connecting pipe. In addition, in a check valve installed in a downstream pipe as disclosed in Patent Document 2, when the length of the vertical pipe (rising pipe) is long, the upper part of the vertical pipe is It is difficult to increase or decrease the diameter of the stopper from the opening. On the other hand, the stopper and therefore the backflow prevention valve cannot be attached. However, in this embodiment, the backflow prevention valve 10 can be easily and appropriately installed from the upper opening of the rising pipe portion 114 to the ridge 100 even if the rising pipe portion 114 is long. Furthermore, for example, when the backflow prevention valve 10 is clogged with foreign matter, the backflow prevention valve 10 can be easily removed from the bag 100.

  Further, in this embodiment, the connecting portion 32 is formed in a cylindrical shape along the inner surface of the rising tube portion 114. For this reason, the valve seat 12 or the valve body 24 in the eaves 100 can be visually inspected from the upper opening of the rising pipe portion 114 without obstructing the view. Even if a foreign object is clogged between the opening 14 and the valve body 24, the foreign object can be removed by inserting a suction hose or the like into the bag 100 without any trouble. Therefore, the maintenance of the backflow prevention valve 10 can be easily performed.

  Furthermore, in this embodiment, on the outer surface of the connecting portion 32, a first contact portion 34a made of an elastic body is provided on the upper portion of the valve seat 12, and opposite to the position where the first contact portion 34a is formed. A second contact portion 34b that receives a reaction force from the elastic body is provided. The contact portion 34 is provided so that the diameter of a circle passing through the outer surface of the first contact portion 34a and the outer surface of the second contact portion 34b is larger than the inner diameter of the rising tube portion 114. The first contact portion 34 a is compressed by the inner surface of the rising pipe portion 114 when the prevention valve 10 is installed on the bag 100. For this reason, the junction part of the valve seat 12 of the backflow prevention valve 10 and the inflow port 102 of the collar 100 can be sealed appropriately, and it can prevent that water leaks from the junction part.

  In the above-described embodiment, the mounting portion 36 is formed at two opposing points on the upper end opening edge of the connecting portion 32, and the operation member 38 having a substantially I-shape is mounted on the mounting portion 36. It is not necessary to be limited to this, and the shape and arrangement position of the mounting portion 36 and the shape of the operation member 38 are not particularly limited.

  For example, as shown in FIG. 11, the third mounting portions 36 c can also be formed at positions facing each other in the axial direction of the opening 14 of the valve seat 12. In this case, the upper side member 42a is grasped and the operation member 38 is rotated in the circumferential direction, and the longitudinal direction of the upper side member 42a of the operation member 38 is set to the axial direction of the inlet 102 of the ridge 100. Match. Thereby, the backflow prevention valve 10 can be arrange | positioned in the direction where the opening 14 of the valve seat 12 and the inflow port 102 of the collar 100 oppose.

  Further, each of the third mounting portions 36c must not be arranged at a position facing in the horizontal direction perpendicular to the axial direction of the opening 14 of the valve seat 12 or a position facing each other in the axial direction of the opening 14 of the valve seat 12. For example, if an arrow indicating the direction of the opening 14 of the valve seat 12 when the lower lateral member 42b is disposed in the third mounting portion 36c is described in the upper lateral member 42a of the operation member 38, the arrow The backflow prevention valve 10 can be rotated in the direction in which the opening 14 of the valve seat 12 and the inflow port 102 of the rod 100 face each other.

  Furthermore, if an arrow indicating the direction of the inlet 102 of the ridge 100 is described in the vicinity of the upper opening of the rising pipe portion 114, for example, when the length of the rising pipe portion 114 is long, the upper opening of the rising pipe portion 102 is long. Even if the direction of the inlet 102 of the ridge 100 cannot be visually confirmed, the backflow prevention valve 10 is set so that the opening 14 of the valve seat 12 and the inlet 102 of the ridge 100 face each other using the arrow or the like as a guide. It can be rotated.

  Although not shown, the mounting portion 36 may be formed in a substantially L shape by the first mounting portion 36a and the second mounting portion 36b. In this case, by arranging the lower lateral member 42b of the operation member 38 in the second mounting portion 36b, the backflow prevention valve 10 can move downward and turn in the circumferential direction.

  Furthermore, although not shown, the mounting portion 36 can be formed in a protruding shape that protrudes upward from the upper end of the communicating portion 32.

  In the above-described embodiment, the first contact portion 34 a and the second contact portion 34 b are provided on the outer surface of the coupling portion 32, and the first contact portion 34 a extends from the upper portion of the valve seat 12. Although the water member 22 is used and the second contact portion 34b is formed in a rectangular plate shape with synthetic resin, it is not necessary to be limited to this. As long as it is formed into a shape having a predetermined length at least in the axial direction of the riser pipe 114 and the direction of the valve seat 12 with respect to the axial direction of the riser pipe part 114 can be regulated, The shape and the arrangement position are not particularly limited.

  For example, the first contact portion 34 a made of an elastic body can be separately provided on the outer surface of the connecting portion 32 without extending the water stop member 22 to the outer surface of the connecting portion 32.

  Alternatively, the first contact portion 34a may be formed of a synthetic resin in a plate shape, and the second contact portion 34b may be formed of an elastic body.

  Furthermore, each of the first contact portion 34a and the second contact portion 34b can be formed of an elastic body.

  Furthermore, a part of the peripheral wall of the connecting portion 32 can be used as the second contact portion 34b. As shown in FIGS. 12 and 13, the connecting portion 32 is formed in a cylindrical shape having an outer diameter substantially equal to the inner diameter of the rising tube portion 114, and a portion corresponding to a position facing the first contact portion 34 a on the peripheral wall thereof. Functions as the second contact portion 34b. In this case, not only the first contact portion 34a and the second contact portion 34b but also the entire peripheral wall of the riser pipe 114 can surround the connection portion 32 and maintain its position. It can be installed on the basket 100 in a stable state. In addition, in order to enlarge the reaction force from the 1st contact part 34a, it is suitable to give the water stop member 22 thickness.

  Further, in the above-described embodiment, the mounting portion 36 is formed in the backflow prevention valve 10 as a rotating means for adjusting the orientation of the valve seat 12 with respect to the circumferential direction of the rising pipe portion 114, and the operation portion mounted on the mounting portion 36 is used. Although the backflow prevention valve 10 is rotated in the circumferential direction by using the member 38, it is not necessary to be limited to this.

  For example, as shown in FIG. 14, the connection part 32 in the backflow prevention valve 10 shown in FIG. 12 can be extended upward, and the upper opening can be made to face the ground surface. In this case, it is not necessary to form the mounting portion 36 in the connecting portion 32, and the operator directly rotates the backflow prevention valve 10 in the circumferential direction, whereby the flow of the valve seat 12 and the rod 100 of the backflow prevention valve 10 is increased. The outlet 102 can be opposed.

  Further, even when the pipe length of the rising pipe portion 114 is short, the operator directly rotates the backflow prevention valve 10 in the circumferential direction so that the valve seat 12 of the backflow prevention valve 10 and the outlet 102 of the rod 100 face each other. Can do.

  Furthermore, in the above-described embodiment, the connecting portion 32 is formed in a cylindrical shape along the inner surface of the rising tube portion 114, but is not limited to this, and connects the valve seat 12 and the contact portion 34. As long as the positional relationship between the valve seat 12 and the contact portion 34 can be fixedly held, the shape of the connecting portion 32 is not particularly limited.

  For example, as shown in FIG. 15, the upper portion of the connecting portion 32 in the check valve 10 shown in FIG. 12 is removed, and an annular portion 44 formed in a short cylindrical shape having the same outer diameter as the connecting portion 32 is formed concentrically. The connecting portion 32 and the annular portion 44 may be connected by a plurality of connecting portions 46 arranged at a predetermined interval. In this case, a part of the peripheral wall of the connecting part 32 corresponding to the opposite side of the first contact part 34a and a part of the annular part 44 positioned coaxially in the vertical direction function as the second contact part 34b.

  Further, as shown in FIG. 16, the connecting portion 32 may be formed in a plate shape having a substantially L-shaped cross section. The communication part 32 includes a first part 32a extending upward from the upper part of the valve seat 12 (saddle part 16) and a second part 32b extending horizontally from the upper end of the first part 32a. A second contact portion 34b formed in a vertically long rectangular shape is integrally provided at the end opposite to the first portion 32a. Further, on the outer surface of the first portion 32a, the water stop member 22 extends from the outer surface of the valve seat 12, and the extended water stop member 22 functions as the first contact portion 34a.

  In the above-described embodiment, one second contact portion 34b is provided for one first contact portion 34a. However, the present invention is not limited to this, and one first contact portion 34a is provided. The plurality of second contact portions 34 b can be arranged along the inner surface of the rising tube portion 114.

  For example, as shown in FIG. 17, the connecting portion 32 extends from the upper portion of the valve seat 12 (saddle portion 16) upward and is formed in a flat plate shape, and from the inner surface side of the first portion 32a. It includes a second portion 32b that extends in the horizontal direction and is formed in a substantially Y shape when viewed from above. On the outer surface of the first portion 32a, a water stop member 22 extends from the outer surface of the valve seat 12, and the extended water stop member 22 functions as the first contact portion 34a. A second contact portion 34b is provided at each end of the second portion 32b opposite to the first portion 32a. The second contact portion 34b is formed, for example, in a columnar shape extending in the vertical direction, and each of the second contact portions 34b comes into contact with the inner surface of the rising pipe portion 114 when the backflow prevention valve 10 is installed on the flange 100. In this case, since the reaction force from the first contact portion 34a can be received by the plurality of second contact portions 34b, the backflow prevention valve 10 can be installed on the bag 100 in a more stable state.

  Furthermore, in the above-described embodiment, the valve seat 12 is formed in a shape in which the tube bottom of the tube portion 18 abuts against the bottom surface of the flange 100, but is not limited to this, and at least the lower end of the valve seat 12 It suffices that the portion abuts against the bottom of the heel 100. For example, as shown in FIGS. 18 and 19, the tube bottom portion of the tube portion 18 is cut away to open the lower end portion of the valve seat 12, and the lower end portion is brought into contact with the invert portion 116 at the bottom portion of the rod 100. The opening 14 can also be formed by the pipe portion 18 of the valve seat 12 and the inverted portion 116 of the flange 100. In this case, even if the backflow prevention valve 10 is installed in the reed 100, a reverse step does not occur in the flow path in the reed 100 from the inflow port 102 to the outflow port 104, and foreign matters do not stay.

  Note that the specific numerical values such as the diameter and height described above are merely examples, and can be appropriately changed as necessary.

It is a perspective view which shows the backflow prevention valve of one Example of this invention. It is sectional drawing which shows the state which attached the backflow prevention valve of FIG. 1 to the bag. It is a top view which shows the side surface of the backflow prevention valve of FIG. It is a top view which shows the upper surface of the backflow prevention valve of FIG. It is a top view which shows the front surface of the backflow prevention valve of FIG. It is a perspective view which shows the member for operation used for the backflow prevention valve of FIG. It is an illustration figure which shows a mode that the member for operation of FIG. 6 is mounted | worn to the mounting part of a backflow prevention valve. It is an illustration figure which shows a mode that a backflow prevention valve is moved below using the operation member of FIG. It is an illustration figure which shows a mode that the backflow prevention valve is rotated in the circumferential direction using the operation member of FIG. It is an illustration figure which shows a mode that a backflow prevention valve is moved upward using the member for operation of FIG. It is a perspective view which shows the backflow prevention valve of another Example of this invention. It is a perspective view which shows the backflow prevention valve of another Example of this invention. It is sectional drawing which shows the state which attached the backflow prevention valve of FIG. 12 to the bag. It is a perspective view which shows the backflow prevention valve of another Example of this invention. It is sectional drawing which shows the state which attached the backflow prevention valve of another Example of this invention to the eaves. It is a perspective view which shows the backflow prevention valve of another Example of this invention. It is a perspective view which shows the backflow prevention valve of another Example of this invention. It is sectional drawing which shows the state which attached the backflow prevention valve of another Example of this invention to the eaves. It is an illustration figure which shows the state which attached the backflow prevention valve of FIG. 18 to the bag.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Backflow prevention valve 12 ... Valve seat 24 ... Valve body 32 ... Connection part 34 ... Contact part 36 ... Mounting part 38 ... Operation member 100 ... １１４ 114 ... Standing pipe part

Claims (7)

A backflow prevention valve that is used for a trough having a rising pipe portion and prevents a backflow of drainage into the inflow port in the trough,
A valve seat having an opening facing the inlet, the lower end of which is in contact with the bottom of the ridge,
A valve body provided on the valve seat and configured to freely open and close the opening;
A contact portion that abuts on the inner surface of the rising tube portion and restricts the orientation of the valve seat with respect to the axial direction of the rising tube portion, and a connecting portion that holds the positional relationship between the valve seat and the contact portion fixedly A backflow prevention valve.   The backflow prevention valve according to claim 1, further comprising rotating means for adjusting a direction of the valve seat with respect to a circumferential direction of the rising pipe portion.   The backflow prevention valve according to claim 2, wherein the rotating means includes a mounting portion formed in the connecting portion and an operation member mounted on the mounting portion.   The backflow prevention valve according to any one of claims 1 to 3, wherein the connecting portion is formed in a cylindrical shape along an inner surface of the rising pipe portion.   The contact portion includes a first contact portion and a second contact portion, at least one of which is made of an elastic body. The first contact portion is provided on an upper portion of the valve seat, and the second contact portion is the first contact portion. The backflow prevention valve according to any one of claims 1 to 4, which is provided at a position for receiving a reaction force from a hitting portion.   The diameter of a circle passing through the outer surface of the first contact portion and the outer surface of the second contact portion is larger than the inner diameter of the rising tube portion, and at least one of the first contact portion and the second contact portion is The backflow prevention valve according to claim 4 or 5, wherein the backflow prevention valve is compressed by an inner surface of the rising pipe portion. A backflow prevention valve installation method for installing the backflow prevention valve according to any one of claims 3 to 6 in a cage,
(A) inserting the backflow prevention valve from an upper opening of the rising pipe portion;
(B) pushing the backflow prevention valve downward using the operation member and bringing the lower end of the valve seat into contact with the bottom of the rod; and (c) the backflow using the operation member. A method of installing a check valve, comprising the step of rotating a check valve in the circumferential direction so that the opening of the valve seat faces the inlet of the ridge.

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