JP6478636B2 - Float type backflow prevention valve - Google Patents

Description

  The present invention relates to a float type backflow prevention valve disposed in a drainage system which discharges drainage generated in a site of a factory or the like or in a building into a river, a sea, a public drainage facility or the like.

  In the drainage system that discharges the drainage (fluid) generated in the site of the factory or in the building into the river, sea, public drainage facilities, etc., the backflow (overflow) is prevented to drain in the forward direction from upstream to downstream. Float type non-return valve is provided.

  The float-type check valve has a plurality of types such as those using a single float (see, for example, Patent Document 1) or those using a plurality of floats (see, for example, Patent Document 2) There is.

  In the float-type backflow non-return valve described in Patent Document 2, one float is accommodated in each of two accommodation portions arranged in an up and down manner. The floats of the respective housings have different functions.

  The float of the upper accommodation portion opens the flow hole by floating at the time of occurrence of forward drainage from upstream to downstream and guides the drainage to the downstream side. In addition, this float closes the flow hole by descent when drainage is not generated. The float in the lower housing part closes the flow hole by floating and prevents backflow to the upstream when backflow water in the reverse direction to the forward direction is generated. In addition, this float opens the flow hole by descent at the time of forward drainage and in a state where drainage is not generated.

Japanese Utility Model Application Publication No. 6-67588 Japanese Utility Model Publication No. 49-100241

  In the float type backflow check valve having the two floats described above, when the drainage in the forward direction is generated, the upper float floats up and opens the flow hole, but the drainage drops so as to abut the upper float. That is, the drainage abuts on the upper float that is about to rise, and inhibits the float from rising. Therefore, the flow of drainage was obstructed.

  An object of the present application is to provide a float type backflow preventive valve capable of reducing the hindrance of float floating due to drainage.

  The float type non-return valve disposed in the drainage system for draining from the upstream side to the downstream side disclosed in the present application includes a hollow first accommodation portion and a second accommodation portion, a first annular valve seat, a partition member, a second annular It has a valve seat, a first float, and a second float. The first housing portion and the second housing portion are vertically connected to communicate the upstream side and the downstream side of the drainage system. The first annular valve seat is disposed on the upper surface of the first accommodation portion, and opens in the vertical direction to communicate the upstream side of the drainage system with the first accommodation portion. The partition member partitions the first storage portion and the second storage portion, and has a communication hole communicating the first storage portion and the second storage portion. The second annular valve seat is disposed on the bottom surface of the second accommodation portion, and opens in the vertical direction to communicate the second accommodation portion with the downstream side of the drainage system. The first float is accommodated in the first accommodation portion so as to be movable in the vertical direction, floats up as the water level rises in the first accommodation portion, and is fitted to the opening of the first annular valve seat to open the opening Closing the first annular valve seat and lowering the water level of the first storage section to open the opening of the first annular valve seat, thereby closing the first annular valve seat. Open. The second float is accommodated in the second accommodation portion so as to be vertically movable, and floats with the rise in water level in the second accommodation portion to open the opening of the second annular valve seat. The second annular valve seat is opened by opening the second annular valve seat and lowering with the lowering of the water level of the second accommodation portion so as to fit in the opening of the second annular valve seat and close the opening. Close the plug.

  The communication hole may be disposed at a position where the first float and the second float are not closed.

  The communication hole may be formed such that the inflow direction of the fluid into the second accommodation portion is in a direction away from the second annular valve seat.

  The communication hole may be formed such that the inflow direction of the fluid to the first accommodation portion is in the direction close to the first float.

  According to the float type non-return valve disclosed in the present application, the float is accommodated in each of the two accommodating portions connected vertically. The forward drainage from the upstream to the downstream of the drainage system flows first into the upper first storage section and then into the lower second storage section. The second float accommodated in the second accommodation part floats up by drainage and opens the second annular valve seat. Then, the drainage flows downstream through the opening of the opened second annular valve seat. The said drainage flows into a 1st accommodating part, and the force of a forward direction (vertical downward) is reduced. That is, the momentum of the forward direction of drainage can be reduced in the first accommodation part before reaching the second float. Therefore, inhibition of the float of the second float due to drainage can be reduced, and drainage efficiency can be improved.

FIG. 2 is a cross-sectional view of the non-return valve according to the first embodiment. It is the figure which looked at the 1st annular valve seat from the 1st float side. It is the figure which looked at a divider plate from the 1st float side. It is the figure which looked at the 2nd annular valve seat from the 2nd float side. It is explanatory drawing which shows the operation state of a backflow preventive valve. It is an expanded sectional view of a divider plate. FIG. 7 is a cross-sectional view of a non-return valve according to a second embodiment. FIG. 10 is a cross-sectional view of the non-return valve according to the third embodiment. FIG. 10 is a cross-sectional view of the non-return valve according to the fourth embodiment. FIG. 14 is a cross-sectional view of the non-return valve according to the fifth embodiment. It is an expanded sectional view and a top view of a divider plate which illustrated the shape of the communicating hole concerning other examples. It is an expanded sectional view of the divider plate concerning other examples.

  A float type backflow non-return valve (hereinafter referred to as a backflow non-return valve) according to the present application will be described with reference to the drawings. The configuration of the check valve disclosed in the present application is not limited to the embodiment.

Configuration of First Reverse Check Valve 1 FIG. 1 is a cross-sectional view of the reverse check valve 1 according to the first embodiment. FIG. 2 is a view of the first annular valve seat 15 of the check valve 1 as viewed from the first float 9A side. FIG. 3 is a view of the divider plate 7 of the check valve 1 as viewed from the first float 9A side. FIG. 4 is a view of the second annular valve seat 17 of the check valve 1 as viewed from the second float 9B side. In addition, in FIGS. 2 to 4, for convenience of explanation, illustration of a part of the configuration such as the floats 9A and 9B is omitted.

  As shown in FIG. 1, the backflow prevention valve 1 of this embodiment is disposed in a drainage system for discharging drainage (fluid) generated on the floor 2 (upstream) of a building to a river or sea (downstream) To prevent backflow water (fluid) from flowing back to floor 2 from the downstream (overflow prevention). The drainage system includes a recess H formed on the floor surface 2 and a drainage pipe 3 extending downward from the bottom of the recess H. The backflow prevention valve 1 is disposed at the upper end of the drainage pipe 3.

  The backflow prevention valve 1 is provided with a main body 5, a float accommodating portion 6, a partition plate 7, a support plate 8, a first float 9A, a second float 9B, and the like. The main body 5 has a stepped annular (perforated disk) shape having an inner surface 11 having an upstream port 11 having a circular cross section penetrating in the vertical direction. Further, the main body 5 (flange 5A) is fixedly supported on the bottom surface of the recess H by welding 4.

  The float accommodating portion 6 is a cylindrical member having an upper surface, and communicates the upstream port 11 with the drainage pipe 3 (downstream port 19). The float accommodating portion 6 has two accommodating portions (a first accommodating portion 20, a second accommodating portion 21). The floats 9A and 9B are accommodated in the respective accommodating portions 20 and 21. The float accommodating portion 6 is made of metal such as stainless steel, for example. The float accommodating portion 6 is fixedly supported on the lower surface of the main body 5 by four screws 12 (see FIG. 2) on the upper surface. The upper surface of the float housing portion 6 has an annular structure with an inner surface step, and the first annular valve seat 15 is sandwiched between the inner surface stepped portion 10 and the lower surface of the main body 5. That is, the upper surface of the float accommodating portion 6 functions as a valve seat presser, and presses and fixes the first annular valve seat 15 to the lower surface of the main body 5.

  The first annular valve seat 15 is made of, for example, rubber, and has a communicating opening 15A at the center as shown in FIG. The annular valve seat 15 communicates the upstream port 11 with the first accommodation portion 20 via the communication opening 15A.

  The partition plate (partition member) 7 has a disk shape as shown in FIG. 3 and is fixedly supported by welding on the inner side surface of the float housing portion 6. The partition plate 7 is made of metal such as stainless steel, for example. The partition plate 7 divides the float accommodating portion 6 into two, a first accommodating portion 20 and a second accommodating portion 21. Further, the partition plate 7 has a plurality of communication holes 16 penetrating from the upper surface to the lower surface, and communicates the first accommodation portion 20 and the second accommodation portion 21 via the communication holes 16. The communication hole 16 is formed on the circumferential surface side of the partition plate 7 which is a position where the first float 9A is not closed. Further, as shown in FIG. 1, the communication hole 16 is inclined in a direction in which the penetration direction (hole direction) from the upper surface to the lower surface of the partition plate 7 is apart from the center of the partition plate 7.

  The support plate 8 has an annular structure as shown in FIG. 4 and is fixedly supported by welding on the inner surface of the lower end of the float accommodating portion 6. The support plate 8 supports the annular valve seat 17 on the top surface. The second annular valve seat 17 is pressed and fixed to the support plate 8 by the valve seat presser 18. The second annular valve seat 17 is made of, for example, rubber, and has a communication opening 17A at the center. The second annular valve seat 17 communicates the upstream housing portion 21 with the downstream drain pipe 3 via the communication opening 17A. The valve seat retainer 18 has an annular structure as shown in FIG. 4 and is fixed to the support plate 8 by four screws 13.

  The floats 9A, 9B are formed of metal such as stainless steel and have the same hollow spherical shape as shown in FIG. The floats 9A and 9B are formed to have a specific gravity smaller than that of the drainage, and move (float and descend) in the housings 20 and 21 in accordance with the water level change in the housings 20 and 21 (during drainage). The first float 9A is engaged with the communication opening 15A by floating to close the first annular valve seat 15. The second float 9B is fitted to the communication opening 17A by lowering to close the second annular valve seat 17.

Operation of Second Floats 9A and 9B FIG. 5 (A) is an explanatory view showing an operation state of the backflow prevention valve 1 when drainage flows from the upstream to the downstream (forward direction) in normal time, and FIG. ) Is an explanatory view showing an operation state of the backflow prevention valve 1 when backflow water flows from the downstream to the upstream (reverse direction) at the time of backflow. The arrow shown by the dotted line in FIG. 5A exemplifies the flow of waste water flowing in the forward direction. Moreover, FIG. 5 (B) has shown the state with which the accommodating parts 20 and 21 were satisfy | filled with backflow water.

  In normal times, the water level in the drain pipe 3 is generally lower than the position where the support plate 8 is disposed. Therefore, when drainage does not occur, the floats 9A and 9B are lowered as shown in FIG. It becomes a state. That is, the first float 9A is in a state of being placed (landed) on the partition plate 7, and the second float 9B is in a state of being fitted to the communication opening 17A. Therefore, the first annular valve seat 15 is opened, and the second annular valve seat 17 is closed.

  In normal times, when drainage in the forward direction occurs, the drainage flows into the first accommodation portion 20 through the upstream port 11 and the communication opening 15A. Thereafter, the drainage passes through the communication hole 16 and flows into the second accommodation portion 21. The first float 9A is in a state of being landed on the partition plate 7 as shown in FIG. In normal operation, the water level of the first accommodation portion 20 basically does not rise to such an extent that the first float 9A closes the first annular valve seat 17, so the first float 9A does not Do not close.

  The waste water flowing into the second accommodation portion 21 is stored in the second accommodation portion 21 because the second float 9B closes the second annular valve seat 17. And since the water level of the 2nd accommodating part 21 rises, for example, as shown to FIG. 5 (A), the 2nd float 9B floats up by the buoyancy in the state in which the lower part substantially half was submerged. Thereby, the second annular valve seat 17 is opened, and the waste water stored in the second accommodation portion 21 passes through the communication opening 17A, flows out to the downstream port 19, and is finally discharged to a river or the like. . And the water level of the 2nd accommodating part 21 also falls, and the 2nd float 9B seats on the 2nd annular valve seat 17 again. Thereby, the second annular valve seat 17 is closed again. Thus, the second float 9B ascends to open the second annular valve seat 17 when drainage in the forward direction occurs.

  On the other hand, since the water level in the drain pipe 3 rises from the downstream side toward the float accommodating portion 6 at the time of backflow, the backflow water reaches the second annular valve seat 17 from the downstream port 19. Then, as shown in FIG. 5 (B), the second float 9B is pushed up (floats up) to the rising drainage. As a result, the second annular valve seat 17 is opened, and the back flow water flows from the downstream port 19 into the second accommodation portion 21 through the communication opening 17A. Then, when the water level of the second accommodation portion 21 rises, the backflow water passes through the communication hole 16 and flows into the first accommodation portion 20.

  As the water level of the first accommodation portion 20 rises due to the reverse flow water, for example, the first float 9A starts to rise by buoyancy in a state where about a lower half is submerged. Then, when the water level of the first accommodation portion 20 further rises, the first float 9A further rises and engages with the communication opening 15A as shown in FIG. 5 (B), and the first annular valve seat 15 Close the plug.

Thereby, backflow water can be reliably prevented from overflowing to the floor surface 2 or the like upstream of the first annular valve seat 15. The floats 9A and 9B do not have to have a precise spherical shape, and may have a substantially spherical shape that can close the first annular valve seat 15 and the second annular valve seat 17. The floats 9A and 9B may not have the same shape.

Operation of Drainage and Backflow Water in Third Communication Hole 16 FIG. 6 is an enlarged sectional view of the partition plate 7. As described above, the communication hole 16 is inclined in the direction in which the penetration direction is away from the center of the partition plate 7. Therefore, when passing through the communication hole 16, the normal forward drainage flows into the second accommodation portion 21 in a direction in which it abuts on the inner side surface of the second accommodation portion 21 as indicated by the arrow W1. That is, the drainage flows into the second accommodation portion 21 in a direction away from the second float 9B (the second annular valve seat 17). Therefore, since the drainage does not directly contact the second float 9B, the floating of the second float 9B is prevented from being impeded by the abutment of the drainage flowing into the second accommodation portion 21.

  Further, when passing through the communication hole 16, the backflow water in the backflow direction flows back into the first accommodation portion 20 in the direction close to the first float 9A as shown by the arrow W2. Thereby, the backflow water directly abuts on the first float 9A, and biases the first float 9A in a direction to push it upward.

  As described above, the floats 9A and 9B are accommodated in the two accommodating portions 20 and 21 connected vertically. The drainage in the forward direction from the upstream to the downstream of the drainage system first flows into the upper first storage unit 20 and then flows into the lower second storage unit 21. The second float 9 </ b> B accommodated in the second accommodation portion 21 ascends by drainage and opens the second annular valve seat. Then, the drainage flows downstream through the opening of the opened second annular valve seat. By flowing the drainage into the first storage unit 20, the force in the forward direction (vertically downward) is reduced. That is, the momentum of the forward direction of drainage can be reduced in the first accommodation portion 20 before reaching the second float 9B. Therefore, the obstruction to the floating of the second float 9B due to the drainage can be reduced, and the drainage efficiency can be improved.

  Further, as described above, since the penetration direction of the through hole 16 is inclined in the direction away from the center of the partition plate 7, the floating of the second float 9B flows into the second accommodation portion 21 at normal times. Can be prevented from being disturbed by the contact of the Therefore, drainage can be discharged more efficiently. Furthermore, since the first float 9A is urged upward by the abutment of the backflow water against the first float 9A at the time of backflow, the first annular valve seat 15 can be closed more quickly.

  This embodiment differs from the above-described first embodiment in the configuration of the float accommodating portion. This different configuration will be described with reference to FIG. The other configuration is the same as that of the first embodiment, and hence the description is omitted.

  FIG. 7 is a cross-sectional view of the non-return valve 100 according to the second embodiment. In this embodiment, the float accommodating portion 60 is constituted by separate cylindrical members 61 and 62. The cylindrical member 61 forms the housing portion 20 and is fixedly supported on the lower end of the main body 5 together with the first annular valve seat 15 on the upper surface as in the first embodiment. Further, the cylindrical member 61 has a flange 61A formed on the outer periphery at the lower end.

  The cylindrical member 62 forms the housing portion 21 and supports the support plate 8 in which the second annular valve seat 17 is disposed at the lower end as in the first embodiment. Further, the cylindrical member 62 is formed with a flange 62A on the outer periphery at the upper end. The flange 62A is fixedly supported by a bolt and a nut (not shown) on the flange 61A of the cylindrical member 61 while holding the partition plate 70. The partition plate 70 has a communication hole 16 of the same shape as that of the first embodiment.

  This embodiment differs from the previous embodiment 1 in the configuration in which the check valve is provided between the two drains. This different configuration will be described with reference to FIG. The other configuration is the same as that of the first embodiment, and hence the description is omitted.

  8 is a cross-sectional view of the non-return valve 101 according to a third embodiment of the present invention. The main body 50 of the check valve 101 has a male screw 50a at a part of the outer periphery. When the male screw 50 a is screwed to the female screw 30 a formed on a part of the inner periphery of the drain pipe 30, the backflow prevention valve 101 is attached to the drain pipe 30. Further, a drain pipe on the upstream side (not shown) is connected to the upper end of the main body 50 by screw connection in the same manner as the drain pipe 30.

  This embodiment differs from the previous embodiment 1 in the configuration in which the check valve is provided between the two drains. Moreover, it differs from the above-mentioned Example 3 in the structure provided between two drainage pipes using a fixture. This different configuration will be described with reference to FIG. The other configuration is the same as that of the first embodiment, and hence the description is omitted.

  FIG. 9 is a cross-sectional view of the non-return valve 102 according to the fourth embodiment of the present invention. The upper end outer periphery of the main body 51 of the non-return valve 102 protrudes from the drain pipe 31 and is screwed to the fixture 400. The fixture 400 has a substantially cylindrical shape, and a female screw 400 a provided on the inner periphery is screwed to a male screw 31 a provided on the outer periphery of the end of the drainage pipe 31. As a result, the backflow prevention valve 102 is attached to the drainage pipe 31 via the attachment 400. Further, a drain pipe on the upstream side (not shown) is screwed to the upper end of the fixture 400 so as to be fitted onto the fixture 400.

  This embodiment differs from the previous embodiment 1 in the configuration in which the check valve is provided between the two drains. Moreover, it differs from the above-mentioned Example 3 and Example 4 in the structure provided between two drain pipes using a flange. This different configuration will be described with reference to FIG. The other configuration is the same as that of the first embodiment, and hence the description is omitted.

  FIG. 10 is a cross-sectional view of the non-return valve 103 according to the fifth embodiment of the present invention. The main body 52 of the check valve 103 has a flange 52b at its upper end. By fixing the flange 52 b to the flange 32 b provided on the outer periphery of the end of the drain pipe 32 by means of the bolt 450, the backflow prevention valve 103 is attached to the drain pipe 32. Further, at the upper end of the main body 52, a not-shown upstream drainage pipe is fixed to the flange 52b in the same manner as the drainage pipe 32.

[Other embodiments]
In each of the embodiments described above, the penetrating direction of the communication holes formed in the partition plate is inclined in the direction away from the center of the partition plate, but the invention is not particularly limited thereto. Since the force of drainage is reduced by flowing into the first containing portion, the communication hole can be penetrated in any direction as long as the fluid can move between at least the first containing portion and the second containing portion. May be For example, the communication hole may have a shape shown in FIGS. 11 (A) to 11 (D).

  The communication hole 161 shown in FIG. 11A is formed in the center of the partition plate 71 in a square in plan view. In the communication hole 161, one side of the square is shorter than the diameter of the first float, and a gap is formed even when the first float is seated. The drainage can pass through the gap.

  The communication hole 162 shown in FIG. 11B is formed by the through hole 162A in the vertical direction (vertical direction) in the through direction and the through hole 162B inclined in the direction away from the center of the partition plate 72. Further, the communication holes 163 shown in FIG. 11C are formed along the circumferential surface of the partition plate 73 in the vertical direction in the penetration direction. The drain holes from the first accommodating portion can also be made to flow into the second accommodating portion in the direction away from the second float (second annular valve seat) by the communication holes 162 and 163. In addition, the arrangement position and the arrangement number of the communication holes are not limited to the above-described embodiment, and can be arbitrarily set in consideration of the flow rate and the like.

  Moreover, although the upper surface and lower surface of the partition plate of each above-mentioned Example are planes, it is not specifically limited to this. For example, the partition plate 74 may have a recess 250 or 251 having an arc shape in cross section as shown in FIG. 12. In the recess 250, the lowered first float can be seated. In the recess 251, the floated second float can be seated.

  Furthermore, although the partition plate of each of the above-described embodiments is in a state of supporting the lowered first float, it may not support the first float. For example, a support member for supporting the first float may be separately provided above the partition plate.

  Moreover, in the above-mentioned each Example, although it divides using a partition plate into a 1st accommodating part and a 2nd accommodating part, if it is a partition member which can be divided into a 1st accommodating part and a 2nd accommodating part It may be any configuration.

  The present application is useful for reducing the obstruction of float floating due to drainage in a float type backflow preventive valve. In addition, for example, drain water generated in the site of the factory or in the building into rivers, the sea, public drainage facilities, etc., or drain water used in bathtubs and washrooms in ordinary households into public drainage facilities etc. It can be used in the industrial field where construction, sales and operation are carried out.

DESCRIPTION OF SYMBOLS 1, 100-103 Float type backflow preventive valve 5, 50, 51, 52 Main body 3 Drain pipe 6, 60 Float accommodating part 7, 70-74 Partition plate 8 Support plate 9A 1st float 9B 2nd float 15 1st annular valve Seats 16 and 161 to 163 communicating holes 17 second annular valve seat 20 first housing portion 21 second housing portion

Claims (2)

A float-type backflow check valve disposed in a drainage system that drains from upstream to downstream,
A hollow first housing portion and a second housing portion which are vertically connected and communicate the upstream side and the downstream side of the drainage system;
A first annular valve seat which is disposed on the upper surface of the first accommodation portion and which opens in the vertical direction to communicate the upstream side of the drainage system with the first accommodation portion;
A partition member having a communication hole for partitioning the first storage portion and the second storage portion and communicating the first storage portion and the second storage portion;
A second annular valve seat disposed on the bottom surface of the second housing portion and opened in the vertical direction to communicate the second housing portion with the downstream side of the drainage system;
It is accommodated in the first accommodating portion so as to be movable in the vertical direction, floats with the rise in water level in the first accommodating portion, and is fitted to the opening of the first annular valve seat to close the opening. A first annular valve seat is closed, and the first annular valve seat is opened by opening the first annular valve seat by opening the first annular valve seat. With the float,
The second annular portion is accommodated in the second accommodation portion so as to be movable in the vertical direction, and floats with the rise of the water level in the second accommodation portion to open the opening of the second annular valve seat. A second method for closing the second annular valve seat by opening it and lowering it as the water level in the second accommodation portion is reduced to fit in the opening of the second annular valve seat and closing the opening. With the float,
Including float type backflow prevention valve.   The float-type non-return valve according to claim 1, wherein the communication hole is disposed at a position where it is not closed by the first float and the second float.

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