JP2006322532A - Vacuum breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum breaker having high reliability for ensuring vacuum breakage without causing the leakage during washing. <P>SOLUTION: The vacuum breaker comprises a tubular casing having an inflow port and an outflow port for washing water and a vent hole in the side face, and a flexible valve member having a slit portion opposed thereto ranging from a cylindrical portion via a tapered portion. The flexible valve member has the cylindrical portion stored with a gap to the inner wall face of the casing and its diameter is enlarged by washing water supplied from the inflow port to close the vent hole and prevent the leakage of water from the casing and to close the slit portion in response to the vacuum condition of the inflow port and prevent the backflow from the outflow port into the inflow port. On the downstream side beyond the vent hole of the cylindrical portion of the flexible valve member, a bead portion is formed in the peripheral direction which is protruded toward the casing opposed thereto. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes a tubular casing having an inlet and an outlet for washing water and having a vent hole on a side surface, and a flexible valve member provided with a slit portion facing the cylindrical portion through a tapered portion. And the cylindrical portion of the flexible valve member is accommodated to form a gap with the inner wall surface of the casing, and the diameter is expanded by the washing water supplied from the inflow port to close the vent hole, The present invention relates to a vacuum breaker structure that prevents leakage of water from a casing and closes a slit portion in response to a vacuum state of an inflow port to prevent backflow from the outflow port to the inflow port.

  A structure of a conventional vacuum breaker shown in FIG. 5 is known. In the vacuum breaker 51 shown in FIG. 5, a tubular casing 52 having an inflow port and an outflow port for washing water and having a vent hole 54 on a side surface, and a slit facing the tubular portion 59a through a tapered portion 59b. And a tubular portion 59a of the flexible valve member 59 is housed in a gap with the inner wall surface of the casing 52 and supplied from the inlet. The diameter is increased by washing water to close the vent hole 54 to prevent water leakage from the casing 52, and the slit portion is closed in response to the vacuum state of the inflow port, so that the back flow from the outflow port to the inflow port In the vacuum breaker that prevents the air from flowing through the vent hole 54 when the negative pressure is generated in the casing 52 due to the water flow through the flexible valve member 59, the internal pressure of the vacuum breaker is prevented. Azukasuru is that the constricted portion B is formed in the casing 52 (see Patent Document 1).

2-50467 (Page 1-2, Fig. 1 and Fig. 2)

  However, in the conventional vacuum breaker, the sealing force is weak because it is a contact seal by the side surface of the tubular portion 59a of the flexible valve member 59 and the inner wall surface of the casing 52. As a result of repeated contact, wear occurs on the side surface of the tubular portion 59a of the flexible valve member 59, or water scales adhere to the side surface of the tubular portion 59a of the flexible valve member 59 and the inner wall surface of the casing 52. There was a problem that the watertightness between the two could not be maintained and leakage occurred.

  Further, when the flow rate is small, the sealing force between the side surface of the tubular portion 59a of the flexible valve member 59 and the inner wall surface of the casing 52 is not sufficient, and the length of the throttle portion B in the casing 52 is short. There is a problem that leakage occurs from the gap between the flexible valve member 59 and the inner wall surface of the casing 52 due to disturbance of water flowing out from the slit 51.

  Further, since the narrowed portion B is configured integrally with the casing 52, the processing cost is high and the cost is increased.

  Furthermore, since the guide member 60 disposed on the inner side of the flexible valve member 59 is made of a material that does not have elasticity, when the vacuum valve breaks, the flexible valve member 59 contracts. When the vacuum breakage state occurs intermittently due to close contact with the guide member 60, the flexible valve 59 does not return to the original shape due to the close contact of the member at the time of the vacuum break. There was a problem that the member 59 was deformed and the vacuum breaking performance could not be maintained.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a highly reliable vacuum breaker that does not leak during cleaning and reliably breaks the vacuum.

  In order to solve the above-mentioned problem, a first invention is provided with a tubular casing having an inlet and an outlet for washing water, having a vent hole on a side surface, and a slit portion facing the taper portion from the tubular portion. A flexible valve member provided therein, and the tubular portion of the flexible valve member is accommodated so as to form a gap with the inner wall surface of the casing, and is expanded by washing water supplied from the inflow port. A vacuum breaker that closes the vent hole to prevent water leakage from the casing, and closes the slit portion in response to the vacuum state of the inflow port to prevent backflow from the outflow port to the inflow port. The bead portion protruding toward the casing is formed in the circumferential direction on the downstream side of the vent hole of the tubular portion of the flexible valve member.

  According to a second aspect of the present invention, there is provided a flexible valve having a tubular casing having an inlet and an outlet for washing water and having a vent hole on a side surface, and a slit portion opposed from the cylindrical portion through a tapered portion. The flexible valve member is accommodated so that the cylindrical portion forms a gap with the inner wall surface of the casing, and the diameter of the flexible valve member is increased by the washing water supplied from the inflow port to thereby form the vent hole. A vacuum breaker that closes to prevent water leakage from the casing and closes the slit portion in response to a vacuum state of the inlet to prevent backflow from the outlet to the inlet. Projecting inward from the clearance between the inner wall surface of the casing and the tubular portion of the flexible valve member over a predetermined section longer than the inner diameter of the casing, on the outlet side of the flexible valve member storage position. Reduced diameter part is formed And said that you are.

  Further, the reduced diameter portion is formed by a cylindrical body fitted and fixed in a casing.

  3rd invention is provided with the inflow port and outflow port of washing water, the tubular casing which has a ventilation hole in the side surface, and the flexible valve provided with the slit part which faced through the taper part from the cylindrical part The flexible valve member is accommodated so that the cylindrical portion forms a gap with the inner wall surface of the casing, and the diameter of the flexible valve member is increased by the washing water supplied from the inflow port to thereby form the vent hole. In the vacuum breaker, which closes and prevents water leakage from the casing, and closes the slit portion in response to the vacuum state of the inlet, and prevents backflow from the outlet to the inlet, the flexible valve At the inlet side end of the member, there is provided a deformation return member consisting of a ring portion having a water passage inside and a linear elastic body protruding from the ring portion toward the inside of the cylindrical portion. It is characterized by being.

  The present invention exhibits the following effects by the above configuration. That is, according to the first aspect of the present invention, it is possible to provide a highly reliable vacuum breaker that hardly leaks from the gap between the flexible valve member and the casing even when the number of operations increases or when scales adhere. I can do it.

  According to the second invention, it is possible to provide a highly reliable vacuum breaker by eliminating leakage from the gap between the flexible valve member and the inner wall surface due to disturbance of water flowing out of the slit of the vacuum breaker into the casing at a low flow rate. I can do it.

  Further, if the reduced diameter portion is formed by a cylindrical body that is fitted and fixed in the casing, it is possible to provide an inexpensive vacuum breaker because the processing of the component parts becomes easier.

  According to the third aspect of the invention, the vacuum breaker that has been crushed at the time of the vacuum break can be reliably restored to its original shape, and a more reliable vacuum breaker can be provided.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, although the example which applied the vacuum breaker of this invention mainly to the urinal was shown in the present Example, the same effect can be exhibited even if it uses it for a urinal, and backflow, such as a shower hose in a bathroom, is shown. It can also be used by connecting to an instrument that needs to be prevented.

FIG. 1 shows a state in which the vacuum breaker 1 of the present invention is applied to the downstream side of the automatic cleaning valve device 2. The automatic cleaning valve device 2 is a device for supplying cleaning water to the flush toilet 11 by driving the electromagnetic valve 5, and a sensor 3 for detecting a user is provided inside the cover case 2a in which the electromagnetic valve 5 is housed. The battery 4 and a controller (not shown) for controlling the driving of the electromagnetic valve 5 based on the detection signal from the sensor 3 are housed.
The electromagnetic valve 5 can open and close the cleaning flow path by the diaphragm valve 8 attached to the mounting recess 12 provided in the water supply valve main body 9 in which the flow path of the cleaning water is formed. A stop cock 6 and a filter 7 are attached to the water supply valve body 9 on the upstream side of the diaphragm valve 8. A water supply pipe connecting portion 13 is formed on the upstream side of the stop cock 6, and a water supply pipe (not shown) from a water supply source is connected and fixed.

  FIG. 2 shows a cross-sectional configuration diagram of the vacuum breaker 1.

  That is, the vacuum breaker 1 has a casing 10 formed in a circular tube shape, and a flange portion 10a as an inflow port for cleaning water is formed on the upper end portion of the casing 10 so as to protrude outward. A plurality of vent holes 10b are formed on the lower peripheral surface of the portion 10a. Further, a connecting cap nut 16 is disposed at the upper end portion of the casing 10, and is connected to the lower end portion of the water supply valve body 9 through the cap nut 16 in a watertight manner. The flange portion 10a of the casing 10 is placed on the flange portion 16a formed inwardly projecting at the lower portion of the cap nut 16. In addition, the lower end part 10c as an outflow port of the casing 10 is connected to the flush toilet 11 using a connecting pipe (not shown).

  The casing 10 is provided with a rubber flexible valve member 101. The flexible valve member 101 is arranged vertically with a slight gap from the inner wall surface 10d of the casing. The thin-walled side wall 101a, the tapered wall portion 101b formed in an inclined shape at the lower portion of the thin-walled side wall 101a, and the lower portion of the tapered wall portion 101b are integrally extended along the axial center of the casing 10. The rib portion 101e and a flange portion 101f that protrudes outward from the upper end portion of the thin side wall 101a, and a slit 101g is formed between the opposing inner edge sides of the rib portion 101e. Has been.

  Further, a bead 101h projecting toward the opposing casing 10 is formed in the circumferential direction on the downstream side of the portion of the flexible valve member 101 that contacts the vent hole 10b of the casing.

  The flange portion 101f of the flexible valve member 101 is disposed with the ring portion 102a of the deformation preventing member 102 placed thereon. The deformation preventing member 102 is formed of a spring steel wire or the like, and a linear elastic body 102b protruding inward from the ring portion 102a to the center of the flexible valve member 102.

  Further, a substantially cylindrical sleeve 17 having an inner diameter smaller than the inner diameter of the casing 10 is detachably disposed on the casing 10 via an O-ring 18 further downstream of the slit portion 101g. The upstream side and the downstream side are kept watertight. At this time, the relationship of 1 <L / D <3 is maintained between the aperture diameter D of the sleeve 17 and the length L of the sleeve.

Next, the operation of the vacuum breaker will be described.
First, the operation in the water passing state is illustrated in FIG. That is, when cleaning water is introduced from the water supply valve body 9 into the casing 10, the cleaning water passes through the inlet 15 and reaches the flexible valve member 101, and the tapered wall portion 101 b of the flexible valve member 101 is caused by water pressure. Since the bead 101h that presses the side wall and presses the thin side wall 101a to the side and protrudes toward the facing casing 10 is formed in the circumferential direction, the bead 101h is brought into close contact with the inner wall surface 10d of the casing. Water leakage can be satisfactorily prevented from the pores 10b, and the slit 101g of the rib portion 101e can be pushed and expanded to allow water to pass under the casing 10 so that the washing water can be supplied to the flush toilet 11. When the water flow from the water supply valve body 9 is stopped, the vacuum breaker 1 returns to the state shown in FIG.

  In such a structure, even when the thin side wall portion 101a of the flexible valve member 101 is worn due to an increase in the number of washings, or even when a scale or the like adheres to the bead 101h shown in FIG. Can be sealed. As a result, leakage toward the vent hole 10b from the gap between the thin side wall 101a of the flexible valve member 101 and the casing inner wall surface 10d can be prevented from occurring, and a highly reliable vacuum breaker can be provided.

  Further, when the flow rate through the casing 10 is small, the seal between the thin side wall 101a of the flexible valve member 101 and the inner wall surface 10d of the casing is broken due to the up-and-down disturbance of the cleaning water flowing through the casing 10 without the sleeve 17. Although leakage occurs from the vent hole 10b, the presence of the sleeve 17 can suppress such leakage. According to the knowledge of the inventor, it is known that no leakage occurs when the length L of the sleeve 17 extends over a section longer than the throttle diameter D which is the inner diameter (1 <L / D). However, when L / D is greater than 3, the pressure loss at the throttle portion increases, so the pressure in the casing rises and leakage occurs from the thin side wall 101a of the flexible valve member 101 and the casing inner wall surface 10d. I know that. Therefore, the relationship between the throttle diameter D and the length L of the sleeve 17 is set so as to maintain 1 <L / D <3. As a result, it is possible to eliminate leakage from the gap between the thin side wall 101a of the flexible valve member and the inner wall surface 10a of the flexible valve member due to the disturbance of the water flowing out from the slit 101g of the flexible valve member 101 when the flow rate is small.

  Further, the sleeve 17 was made detachable by being installed on the casing 10 via an O-ring 18. This makes it easier to process the component parts, so that an inexpensive vacuum breaker can be provided.

  Next, operation at the time of vacuum break will be described. Now, when the water supply valve body 9 is in a vacuum state for some reason and a siphon action occurs in the casing 10, the outside air is introduced into the casing 10 from the vent hole 10b, and as shown in FIG. When the flexible valve member 101 is pressed against the deformation preventing member 102, the flexible valve member 101 comes into close contact with the flexible valve member 101 and closes the inlet 15. The deformation preventing member 102 is elastically deformed in the direction of the inlet 15 compared to the initial state. ing. At this time, the slit 101g of the rib portion 101e is closed to prevent sewage and the like flowing back from the flush toilet side 11, and it is destroyed by the outside air introduced with the siphon action generated in the casing 10, thereby completely preventing the backflow. .

  When the vacuum state is released, the flexible valve member 101 that is pressed and in close contact with the deformation preventing member 102 has a restoring force to return to the original state due to the elasticity of the linear elastic body 102b of the deformation preventing member 102. It becomes a starting force and can be reliably restored to its original shape. Thereby, a highly reliable vacuum breaker can be provided.

It is the figure showing the automatic toilet bowl washing | cleaning apparatus using the vacuum breaker of a present Example. It is a figure which shows the vacuum breaker of this invention, and has shown the initial state. It is a figure which shows the water flow state of the vacuum breaker of this invention. It is a figure which shows the vacuum fracture state of the vacuum breaker of this invention. It is a figure which shows the conventional vacuum breaker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vacuum breaker, 2 ... Automatic washing valve apparatus, 3 ... Sensor controller, 4 ... Battery, 5 ... Solenoid valve, 6 ... Stop cock, 7 ... Filter, 8 ... Diaphragm valve, 9 ... Water supply valve main body, 10 ... Casing, 11 ... flush toilet, 12 ... mounting recess, 13 ... water supply pipe, 14 ... valve seat, 15 ... inlet, 10a ... casing flange, 10b ... casing vent, 10c ... casing lower end, 10d ... casing inner wall surface 16 ... Cap nut, 16a ... Cap nut flange, 101 ... Flexible valve member, 101a ... Thin side wall, 101b ... Tapered wall portion, 101e ... Rib portion, 101f ... Flange portion, 101g ... Slit, 101h ... Bead, 102 ... Deformation preventing member, 102a ... Ring part, 102b ... Linear elastic body, 17 ... Sleeve, 18 ... O-ring

Claims (4)

A tubular casing having an inlet and an outlet for washing water, having a vent on the side surface, and a flexible valve member provided with a slit portion opposed from the cylindrical portion via a tapered portion; The flexible valve member is housed so that the cylindrical portion forms a gap with the inner wall surface of the casing, and the diameter of the flexible valve member is increased by the washing water supplied from the inflow port to close the vent hole. In the vacuum breaker that prevents water leakage and closes the slit portion in response to the vacuum state of the inflow port to prevent backflow from the outflow port to the inflow port, the tubular portion of the flexible valve member A vacuum breaker characterized in that a bead portion protruding toward the opposite casing is formed in the circumferential direction on the downstream side of the vent hole. A tubular casing having an inlet and an outlet for washing water, having a vent on the side surface, and a flexible valve member provided with a slit portion opposed from the cylindrical portion via a tapered portion; The flexible valve member is housed so that the cylindrical portion forms a gap with the inner wall surface of the casing, and the diameter of the flexible valve member is increased by the washing water supplied from the inflow port to close the vent hole. In the vacuum breaker that prevents water leakage and closes the slit portion in response to the vacuum state of the inlet and prevents backflow from the outlet to the inlet, the flexible valve member of the casing is accommodated. On the outlet side from the position, a reduced diameter portion is formed that protrudes inward from the gap between the inner wall surface of the casing and the cylindrical portion of the flexible valve member over a predetermined section longer than the inner diameter of the casing. Specially that Vacuum breaker to be. The vacuum breaker according to claim 2, wherein the reduced diameter portion is formed by a cylindrical body fitted and fixed in a casing. A tubular casing having an inlet and an outlet for washing water, having a vent on the side surface, and a flexible valve member provided with a slit portion opposed from the cylindrical portion via a tapered portion; The flexible valve member is housed so that the cylindrical portion forms a gap with the inner wall surface of the casing, and the diameter of the flexible valve member is increased by the washing water supplied from the inflow port to close the vent hole. An inlet side end of the flexible valve member in a vacuum breaker that prevents water leakage and closes the slit portion in response to a vacuum state of the inlet and prevents backflow from the outlet to the inlet. Is provided with a deformation return member comprising a ring portion having a water passage hole therein and a linear elastic body projecting from the ring portion toward the inside of the cylindrical portion. Vacuum breaker.

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