JP4329512B2 - Constant flow valve with check function - Google Patents

Description

  The present invention relates to a constant flow valve having a check function.

Conventionally, it is preferable to equip a water supply pipe such as a hot water washing apparatus attached to a toilet with a constant flow valve with a check function. Here, as shown in FIG. 5, the basic structure of the hot water washing apparatus is a hot water tank 3 for storing water, and water supplied from the hot water tank 3 is heated by a heater 2a to form hot water. A hot water tank 2 for storing, a nozzle 6 for injecting hot water stored in the hot water tank 2 toward a portion to be cleaned from the tip 6a, and a water supply pipe for connecting the water supply tank 3 and the hot water tank 2 to each other 4 and a water supply pipe 7 for communicating the hot water tank 2 and the nozzle 6. A water supply valve 5 for controlling the supply of water from the water supply tank 3 is interposed in the flow path of the water supply pipe 4, and further, at a location downstream of the water supply valve 5 in the flow path of the water supply pipe 4. When the pressure relief valve 8 is communicated via the communication pipe 9 and the pressure in the hot water tank 2 exceeds a predetermined value, water is discharged from the pressure relief valve 8 before being supplied to the hot water tank 2. The water pressure in the hot water tank 2 is suppressed to a predetermined value or less.

  In the hot water cleaning apparatus having the above-described configuration, it is preferable that a constant flow valve with a check function is provided in the flow path of the water supply pipe 4 that allows the water supply tank 3 and the hot water tank 2 to communicate with each other. The amount of water supplied from 3 to the hot water tank 2 is adjusted, and the backflow of the supplied water is prevented. The constant flow valve with a check function includes an elastic member that is a valve body that opens and closes the inlet in a case in which an inlet and an outlet through which water passes is formed, and an elastic member that presses the elastic member toward the inlet. The elastic member is deformed according to the biasing means and the pressing force of the water flowing into the case from the inflow port toward the outflow side, and the elastic member is deformed to change the opening area (for example, the elastic member abuts the outflow port). A gap formed between the notch provided on the inner surface of the case and the elastic member so as to communicate with the outflow port, and by allowing water to flow out of the outflow port through this gap, A device for adjusting the outflow amount has been proposed (see Patent Document 1).

However, in the above-described conventional constant flow rate valve with a check function, fluctuations in the inclination direction occur in the elastic member that moves forward and backward in the axial direction while receiving the urging force and water pressure from the urging means. Inevitably, the change in the tilt direction may adversely affect the check function. That is, since the elastic member is in an inclined state, the inlet may not be reliably sealed by the elastic member at the time of backflow. In this case, there is a problem that the check function is not sufficiently exhibited. Further, in order to change the opening area of the gap appropriately by deformation of the elastic member, a thin-walled elastic member is not convenient and a thick-walled one is required. There is a problem that the elastic member has a small deflection and therefore has a poor sealing property.
JP 2000-360232 A

  This invention is invented in view of the said problem, Comprising: It aims at providing the constant flow valve with a non-return function which can exhibit a non-return function reliably with a simple structure.

In order to solve the above-described problems, the constant flow valve with a check function according to the present invention has a thin-walled upstream elasticity that opens and closes the inlet 13 in the case 20 in which the inlet 13 and the outlet 15 through which the fluid passes are formed. A member 21, a downstream elastic member 11 disposed on the downstream side of the upstream elastic member 21, urging means for pressing the upstream elastic member 21 against the inlet 13 through the downstream elastic member 11, The downstream elastic member 11 is deformed in accordance with the pressing force toward the outlet 15 by the fluid flowing into the case 20 from the inlet 13, the gap 8 whose opening area changes , the upstream elastic member 21, and the downstream elasticity. And at least one of the opposing surfaces of the member 11 is provided with a concavo-convex shape for preventing adhesion of both, and the fluid that has flowed into the case 20 from the inlet 13 flows out of the outlet 15 through the gap 8 To do.

In the constant flow valve with a check function configured as described above, when the amount of fluid flowing into the case 20 through the inlet 13 is large due to deformation of the downstream elastic member 11, the opening area of the gap 8 is reduced. In addition, when the flow rate is small, the opening area of the gap 8 can be increased to automatically adjust the flow rate, and the upstream elastic member 11 is pressed against the inflow port 13 at the time of reverse flow. The inlet 13 can be sealed to exhibit a check function. Here, since the upstream elastic member 11 is formed in a thin shape, the flexibility is high, and therefore, the upstream elastic member 11 can be flexed freely according to the opening shape of the inflow port 13 to seal the inflow port 13 with good sealing performance. . Further, even if the inclination direction of the downstream elastic member 21 changes during use, the upstream elastic member 11 is not affected, and the inflow port 13 is also reliably sealed by this. . That is, according to the constant flow valve with a check function having the above-described configuration, the check function can be surely exhibited by the simple structure in which the upstream elastic member 21 and the downstream elastic member 11 are provided as the valve bodies. .

Further, at least one of mutual facing surface of the upstream-side elastic member 21 and the downstream-side elastic member 11 is provided with a concavo-convex shape for preventing the adhesion of both 11 and 21. By doing in this way, even after it is used for a long time, the upstream elastic member 21 and the downstream elastic member 11 can be kept in a separated state, and the check function can be stably exhibited.

It is also preferable to provide a guard portion 16 for preventing the upstream elastic member 21 from being pushed downstream in a portion surrounding the upstream elastic member 21 in the case 20. By doing so, as possible out to prevent the occurrence of a malfunction due to the upstream side elastic member 21 is washed away.

Further, when the inflow port 13 is closed, an uneven shape that makes the upstream elastic member 21 and the periphery of the inflow port 13 of the case 20 line contact each other is formed so that the upstream elastic member 21 and the periphery of the inflow port 13 of the case 20 face each other. It is also preferable to provide it on at least one of the surfaces. By doing in this way, it is prevented that the upstream elastic member 21 adheres to the inner surface of the case 20 in a state where the inlet 13 is sealed, and therefore there is no problem even when water is supplied after being left for a long time. The inlet 13 can be opened.

  The constant flow valve with a check function of the present invention has an effect that the check function can be surely exhibited with a simple structure.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. 1 and 2 show a water supply pipe 4 equipped with an example of a constant flow valve with a check function according to an embodiment of the present invention. As shown in the figure, a strainer plug 10 having a strainer 10a is provided in the flow path of the water supply pipe 4, and the check function of this example is provided on the downstream side of the strainer plug 10 in the flow path. A constant flow valve is provided.

  The constant flow rate valve with a check function of this example includes an upstream elastic member 21 and a downstream elastic member 11 forming a valve body in a cylindrical case 20 forming an outer shell. An inflow port 13 that communicates with the internal space of the case 20 is provided on the upstream side of the case 20, and an outflow port 15 that also communicates with the internal space is provided on the downstream side. A surface 21 a facing the upstream side of the upstream elastic member 21, which is a thin disk made of an elastic body such as synthetic rubber, abuts the peripheral portion of the inlet 13 on the inner surface of the case 20 to close the inlet 13. It is like that. The downstream-side elastic member 11 is a substantially cylindrical thick member made of an elastic body such as synthetic rubber, and a concave portion into which a projection 12a of a plate 12 described later is fitted in a central portion of the surface 11c facing the downstream side. 11a is provided. On the downstream side of the downstream elastic member 11 in the internal space of the case 20, a disk-shaped plate 12 made of a highly rigid resin or the like is provided, and a cylindrical protrusion is formed at the central portion of the surface 12e facing the upstream side. 12a is provided.

  As shown in FIG. 3, the plate 12 is provided with a plurality of through holes 12b at substantially equal intervals so as to surround a central portion where the projections 12a are provided. Then, on the peripheral portion surrounding the region where the through-hole 12b is provided on the surface 12e facing the upstream side of the plate 12, a contact portion 12c formed one step higher toward the upstream side, and the contact portion 12c And a notch 12d formed to be recessed on the downstream side, and the notch 12d and the downstream side in a state where the surface of the contact portion 12c is in contact with the surface 11c facing the downstream side of the downstream elastic member 11. A gap 8 is formed between the elastic member 11 and the elastic member 11. Further, a compression spring 14 as an urging means is disposed on the downstream side of the plate 12 in the internal space of the case 20, and the urging force to the upstream side is applied to the plate 12 by the restoring force of the compression spring 14. It is like that.

  That is, the constant flow valve with a check function of this example arranges the upstream elastic member 21, the downstream elastic member 11, the plate 12, and the compression spring 14 in this order from the upstream side to the downstream side in the case 20. Thus, in a state where liquid, that is, water does not flow in from the inlet 13 of the case 20, the plate 12 is moved to the downstream elastic member 11 by the upstream biasing force applied from the compression spring 14 on the most downstream side. The downstream elastic member 11 is pressed against the upstream elastic member 21, and the upstream elastic member 21 is pressed toward the inlet 13 on the inner surface of the case 20 to maintain the sealed state of the inlet 13. (See FIG. 1). As shown in FIG. 2, when the water having passed through the strainer 10a flows into the inflow port 13, the upstream side against the urging force of the compression spring 14 that presses the upstream elastic member 21 against the inflow port 13 side. The pressing force that presses the side elastic member 21 downstream acts by the water flowing into the inflow port 13, and this pressing force exceeds the urging force of the compression spring 14, so that the compression spring 14 is compressed and the upstream elasticity is compressed. The member 21, the downstream elastic member 11, and the plate 12 are moved integrally to the downstream side, whereby the inlet 13 is released from the sealing by the pressure of the upstream elastic member 21, and water flows into the case 20. It is like that.

  The water that has flowed into the case 20 flows downstream while passing through the side of the upstream elastic member 21 and the downstream elastic member 11, and is formed between the downstream elastic member 11 and the notch 12 d of the plate 12. Through the gap 8 to reach the through-hole 12b of the plate 12, flow through the through-hole 12b to the downstream side of the plate 12 and the compression spring 14, and then flow out of the case 20 through the outlet 15. Is. At this time, the downstream elastic member 11 and the plate 12 are in a state where they are pressed against each other by the pressing force (that is, water pressure) to the outlet 15 side by the water flowing in from the inlet 13 and the biasing force of the compression spring 14. Since the downstream elastic member 11 is deformed according to the pressing force, the opening area of the gap 8 changes. Here, the stronger the pressing force (that is, the higher the water pressure), the more the downstream elastic member 11 is deformed to reduce the opening area of the gap 8. When the flow rate is large and the water pressure is high, the gap 8 When the flow area is small and the flow rate is small and the water pressure is low, the flow area of the water is adjusted by increasing the opening area of the gap 8.

  In this example, by providing the notch 2d in the plate 2 as described above, the gap 8 for allowing the downstream elastic member 11 to pass therethrough and flowing water downstream is formed. However, the present invention is not limited to this. For example, when the plate 2 is not provided, a notch is provided at a location where the downstream elastic member 11 is pressed on the inner surface of the case 20, or the plate 2 of the downstream elastic member 11 itself or the inner surface of the case 20 is provided. A similar gap 8 may be formed by providing a notch portion at a location where it is pressed against. Reference numeral 16 in the figure denotes a guard portion for preventing the upstream elastic member 21 from being pushed downstream beyond the downstream elastic member 11 during water supply, and is an upstream having a disk shape inside the case 20. It is provided in a portion surrounding the outer peripheral edge of the side elastic member 21.

Then, when a back flow occurs on the downstream side of the constant flow valve with a check function of this example, water flows back into the case 20 from the outlet 15. The water pressure of this back flow water and the biasing force of the compression spring 14 Thus, the upstream elastic member 21, the downstream elastic member 11, and the plate 12 are integrally pressed against the inflow port 13, and the upstream elastic member 21 seals the inflow port 13 to make a check. . Although the case where the water pressure of the backflow is low is also conceivable, even in this case, the urging force that the compression spring 14 presses the upstream elastic member 21 against the inflow port 13 via the plate 12 or the downstream elastic member 11 assists. Therefore, the check is surely made.

  Here, in the constant flow valve with a check function of this example, the upstream elastic member 21, the downstream elastic member 11, the plate 12, and the compression spring 14 are placed on the axis of water flowing from the inlet 13 of the case 20. Further, the projection 12a of the plate 12 is fitted in the recess 11a of the downstream elastic member 11, so that the forward / backward movement is performed while receiving the urging force or water pressure of the compression spring 14. Although each member is positioned and prevented from tilting, it is inevitable that the plate 2 and the downstream elastic member 11 fitted thereto are slightly tilted. However, in the constant flow rate valve with a check function of this example, the upstream elastic member 21 is provided separately from the downstream elastic member 11, so that even if the downstream elastic member 11 is tilted, the upstream elastic member 21 is upstream. The elastic member 21 is not affected. Therefore, the upstream elastic member 21 can reliably seal the inflow port 13 and exhibit a check function. Further, since the upstream elastic member 21 is formed to be thin, it has flexibility, so that when the inlet 13 is sealed at the time of reverse flow, the upstream elastic member 21 can be flexed freely according to the opening shape of the inlet 13. The inlet 13 is sealed with a good sealing property to perform the check.

  Furthermore, in the constant flow rate valve with a check function of the present example, the protrusion 11b is provided on the central portion of the surface facing the upstream elastic member 21 of the downstream elastic member 11 (that is, the surface facing the upstream side). A shape is formed, and the uneven shape prevents the upstream elastic member 21 and the downstream elastic member 11 from adhering to each other on the opposing surfaces. Therefore, the upstream elastic member 21 and the downstream elastic member 11 are kept separated even after being used for a long period of time, and the check function is stably exhibited. The structure for forming the concavo-convex shape is not limited to providing the protrusion 11b, and it is also preferable to provide a groove or a textured texture. Further, the uneven shape is not limited to being provided on the downstream elastic member 11, and may be provided on at least one of the opposing surfaces of the upstream elastic member 21 and the downstream elastic member 11.

  In addition, in the constant flow valve with a check function of the present example, a semicircular projection 30 is formed in a ring shape over the entire circumference on the peripheral portion of the inlet 13 on the inner surface of the case 20. Since the inner surface of the case 20 has a concavo-convex shape due to the protrusion 30, the contact between the upstream elastic member 21 and the inner surface of the case 20 when closing the inlet 13 is a ring shape between the upstream elastic member 21 and the tip of the protrusion 30. Thus, the upstream elastic member 21 is prevented from adhering to the inner surface of the case 20 in a state where the inflow port 13 is sealed. Therefore, even if it is used after being left for a long period of time, the inlet 13 is opened without any problem to supply water. Note that the structure for preventing the upstream elastic member 21 from adhering to the inner surface of the case 20 as described above is not limited to the provision of the protrusion 30, and the upstream elastic member 21 and the periphery of the inlet 13 of the case 20. What is necessary is just to form the uneven | corrugated shape which makes the upstream elastic member 21 and the inflow port 13 periphery part of case 20 line-contact in at least one of the mutually opposing surfaces of a part.

  Next, another example of the constant flow valve with a check function in the embodiment of the present invention will be described. In the configuration of this example, the upstream elastic member 21 and the downstream elastic member 11 are formed as one member. Since the configuration is the same as that of the example except for the above, the description of the configuration similar to the example is omitted, and only the configuration different from the example is described below.

FIG. 4 shows an elastic member 40 constituting the valve body of the constant flow valve with a check function of this example. The elastic member 40 includes the upstream elastic member 21 and the downstream elastic member 11 described in the example, the upstream elastic member 21 does not lose flexibility, and the upstream elastic member 21 and the downstream elastic member 11. Are connected via a connecting portion 41 so that they can be tilted independently, and are connected to a portion of the upstream elastic member 21 and a portion of the downstream elastic member 11 using an elastic body such as synthetic rubber. The part 41 is integrally formed. The connection part 41 connects the center part of the mutually opposing surface of the upstream elastic member 21 and the downstream elastic member 11. Also in the elastic member 40 having the above configuration, the upstream elastic member 21 part and the downstream elastic member 11 part perform the same functions as in the example, and open / close the inlet 13 and adjust the opening area of the gap 8. Moreover, since the elastic member 40 is an integral member, the number of parts can be reduced, and the cost and assembly time can be reduced.

It is explanatory drawing of the constant flow valve with a non-return function of an example in embodiment of this invention, (a) is a cross-sectional shape of the water supply pipe provided with the constant flow valve with a non-return function, (b) is determined with a non-return function. The front view shape of the upstream elastic member with which a flow valve is equipped is shown. It is sectional drawing at the time of water supply of the water supply pipe provided with the constant flow valve with a non-return function same as the above. It is a perspective view of the plate with which the constant flow valve with a non-return function same as the above is equipped. It is sectional drawing of the elastic member with which the constant flow valve with a non-return function of the other example in embodiment of this invention is equipped. It is a general block diagram of a warm water washing apparatus.

8 Clearance 11 Downstream Elastic Member 13 Inlet 14 Compression Spring 15 Outlet 16 Guard Part 20 Case 21 Upstream Elastic Member 30 Protrusion 40 Elastic Member 41 Connecting Part

Claims (3)

A thin upstream elastic member that opens and closes the inlet, a downstream elastic member disposed downstream of the upstream elastic member, and an upstream elastic member in a case in which an inlet and an outlet through which the fluid passes are formed Urging means that presses against the inlet side via the downstream elastic member, and the downstream elastic member is deformed according to the pressing force to the outlet side by the fluid that has flowed into the case from the inlet, thereby opening the opening area And at least one of the opposing surfaces of the upstream elastic member and the downstream elastic member are provided with a concavo-convex shape for preventing adhesion of both, and the fluid flowing into the case from the inlet is A constant flow valve with a check function, characterized in that it flows out from the outlet through a gap. The constant flow valve with a check function according to claim 1 , wherein a guard portion for preventing the upstream elastic member from being pushed downstream is provided at a portion surrounding the upstream elastic member in the case. . An uneven shape for linearly contacting the upstream elastic member and the inlet peripheral portion of the case when the inlet is closed is provided on at least one of the opposing surfaces of the upstream elastic member and the peripheral portion of the inlet of the case. The constant flow valve with a check function according to claim 1 or 2 .

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