JP2006266276A - Self-closing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-closing valve with a fixed flow rate valve capable of stabilizing operation of a main valve even when water pressure on a primary side is reduced. <P>SOLUTION: When a knob 13 is pressed down against a return spring 11 from a water cut-off condition, an operation rod 18 lowers, and a pilot valve 19 integrated with the operation rod 18 also lowers and leaves a valve seat. As a result, since pressure in a pressure chamber P is equal to pressure on the primary side, water in the pressure chamber P passes through a pilot hole in a pipe member 20 and flows into a flow-out port 3 on a secondary side to let the pressure escape. When pressure in the pressure chamber P escapes onto the primary side and the pressure in the pressure chamber P is reduced, the main valve 14 rises due to the pressure on the primary side. As a result, the main valve 14 leaves the valve seat 16, and a water passing passage is opened. Since the fixed flow rate valve 23 is arranged in the water passing passage, fixed amount of water flows from a flow-in port 2 into the flow-out port 3 by the fixed flow rate valve 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a self-closing valve applied to a washbasin or the like of a public facility.

  Conventionally, a pilot-type self-closing valve is often employed as a bathroom, a washroom, faucet water discharge and an automatic water stop mechanism from the viewpoint of saving water.

  The outline of such a pilot-type self-closing valve will be explained. By pushing the knob, the pilot valve is separated from the pilot valve seat, and the primary pressure filled in the pressure chamber is released to the secondary side flow path so that the pressure chamber and the primary side are released. A pressure difference is created between the pressure and the main valve, which causes the main valve to move away from the valve seat and supply primary water to the secondary side.On the other hand, when the knob is released, the pilot valve moves to the pilot valve seat. The primary valve is seated and the pressure on the primary side gradually fills the pressure chamber through the small hole, and the main valve is closed when the pressure chamber is filled with the primary pressure. As such a pilot type self-closing valve, what is indicated by patent documents 1 and 2 is known.

  Patent Document 1 discloses a self-closing valve in which a main valve is a diaphragm type, and cleaning water from the diaphragm valve is distributed to a rim cleaning and a bowl cleaning by a rotating drum. In the self-closing valve, a constant flow valve is provided at the most upstream part of the primary side, and the flow rate of the washing water flowing to the self-closing valve unit is made constant regardless of the level of the supply water pressure.

In Patent Document 2, self-closing valve bodies A and B having a cylindrical shape are fitted to form a self-closing valve body, while the main valve is provided with a large-diameter portion and a small-diameter portion, and the large-diameter portion is one self-closing portion. The valve body B is slidable on the inner peripheral surface of the valve body B, and the small-diameter portion is slidable on the inner peripheral surface of the other self-closing valve body A, between the inner peripheral surface of the one self-closing valve body B and the main valve. The pressure chamber is formed in the side, the pilot hole that communicates the pressure chamber and the secondary side is formed on the side of the self-closing valve body B, and the small hole that leads the pressure on the primary side to the pressure chamber is formed in the main valve Is disclosed. In Patent Document 2, the pilot valve and the main valve are separately configured to reduce the operating force, improve the operational feeling, and make it compact.
JP 2000-34762 A JP 2004-251422 A

  Since the self-closing valve disclosed in Patent Document 1 includes a constant flow valve, it is possible to suppress fluctuations in the amount of water supplied to the secondary side due to the pressure on the primary side. Since the constant flow valve has a pressure loss because it is provided upstream of the small hole, when the primary pressure is low, the pressure difference between the pressure chamber and the primary side becomes small, and the operation of the main valve becomes dull.

  Since Patent Document 2 does not include a constant flow valve, the amount of water supplied to the secondary side varies due to the pressure on the primary side. In addition, if a constant flow valve is incorporated, there remains a problem even if it is provided downstream of the small hole that guides the primary pressure to the pressure chamber so that the operation of the main valve does not blur. That is, in Patent Document 2, a U-shaped packing that is in sliding contact with the inner peripheral surface of the self-closing valve body is mounted on the outer periphery of the large-diameter portion of the main valve. The pressure chamber, that is, the pressure on the primary side acts, and the pressure on the secondary side acts on the convex portion of the U-shaped packing. As a result, there is a pressure difference between the concave and convex portions of the U-shaped packing at the time of water stoppage, and the smooth movement of the main valve may be hindered due to this pressure difference. In addition, the durability of the packing is also adversely affected.

  In order to solve the above-described problems, the present invention provides a main valve that is detachable from a valve seat, and a water pressure acting on the main valve that is provided in a region opposite to the valve seat across the main valve. A pilot that opens the primary pressure in the pressure chamber to the secondary flow path by communicating the pressure chamber, a small hole that guides the pressure in the primary flow path to the pressure chamber, and the pressure chamber and the secondary flow path A hole, a pilot valve that opens and closes the pilot hole, and a return spring that applies an urging force in the direction in which the pilot valve is seated, and from the primary side flow path to the secondary side for a predetermined time according to the pressure fluctuation in the pressure chamber In the self-closing valve for supplying water to the flow path, an opening connected to the primary flow path is provided, and a constant flow valve is provided in a water passage for supplying water from the opening to the valve seat of the main valve.

  By adopting the above configuration, the constant flow valve becomes a pressure loss, the pressure difference between the primary side pressure and the pressure chamber can be prevented from being reduced, and the operation of the main valve is stabilized. In addition, the structure is more compact than when the constant flow valve is provided outside the self-closing valve unit.

Further, in Patent Document 2, since the pilot hole is formed in the radial direction of the valve body, the primary pressure is applied to the concave portion when the water is stopped, while the convex portion of the packing attached to the large diameter portion of the main valve is stopped. However, in the invention described in claim 2, the self-closing valve is composed of an upper body and a lower body, and a large diameter portion of the main valve slides in the upper body. A pressure chamber is formed by movably fitting, the small diameter portion of the main valve faces in the lower body, the small hole is formed through the large diameter portion of the main valve, and the small diameter of the main valve is formed through the water passage. Since the same pressure is applied to the recesses and protrusions of the packing when the water stops, the packing does not stick when the main valve starts to operate. Life span is also extended.

In the invention according to claim 3, a pipe member that defines a pilot hole is attached to the pilot valve, and the pipe member is extended to the secondary side flow path through a through hole formed in the axial direction of the main valve. Since the same pressure is applied to the concave portion and the convex portion of the packing at the time of water stoppage, the packing does not stick at the start of the operation of the main valve, and the life of the packing is extended.

  According to the first aspect of the invention, a constant flow valve is incorporated, and stable operation of the main valve can be ensured even when the pressure on the primary side is low.

According to the invention which concerns on Claim 2, there is no feeling of being caught at the time of the operation | movement start of a main valve, and the lifetime of packing is also extended.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a longitudinal sectional view of a main valve and a pilot valve of a self-closing valve according to the present invention in a closed state (water-stopped state), and FIG. 2 is an enlarged sectional view illustrating details of the structure of the pilot valve and its valve seat, 3A is a plan view of the constant flow valve, and FIG. 3B is a cross-sectional view of the constant flow valve.

  In FIG. 1, the self-closing valve has a primary inlet 2 formed on the side surface of the faucet body 1, and a secondary outlet 3 formed on the lower surface. It communicates in an internal space 4 formed in the faucet body 1. An opening 5 is formed on the upper surface of the faucet body 1, and the opening 5 is connected to the internal space 4.

  A cylindrical lower body 6 and upper body 7 constituting a self-closing valve body are accommodated in the internal space 4. The lower main body 6 has an internal thread portion formed on the inner peripheral surface, and an opening 8 connected to the inflow port 2 formed on the side surface.

  A male thread portion is formed on the outer periphery of the lower portion of the upper body 7 so as to be screwed into a female thread portion formed on the inner circumferential surface of the lower body 6. By screwing the upper body 7 to a predetermined depth of the lower body 6, A self-closing valve body is constructed.

  The upper surface of the upper main body 7 has a concave portion formed by a partition wall 9, and a cup-shaped case 10 is fitted into the concave portion, and a return spring 11 is accommodated in the cup-shaped case 10. A knob 13 is attached to the upper surface of the faucet body 1 via a nut 12, and the knob 13 is biased upward by the return spring 11, that is, in a direction in which a pilot valve described later is seated. Therefore, in the water stop state, as shown in FIG. 1, the elastic force of the return spring 11 causes the bottom surface of the knob 13 and the top surface of the faucet body 1, and the bottom surface of the operation portion 17 and the top surface of the cup-shaped case 10 to A slight gap is formed between them.

On the other hand, a main valve 14 is disposed in a self-closing valve body composed of the lower body 6 and the upper body 7. The main valve 14 has a large-diameter portion at the top, and the large-diameter portion is slidably fitted to the inner peripheral surface of the upper main body 7 via a U-shaped packing 14a. A pressure chamber P is defined by the lower surface of the wall 9 and the upper surface of the large diameter portion of the main valve 14.

  A small diameter portion of the main valve 14 faces the lower main body 6, and an opening 6 a connected to the outflow port 3 is formed on the bottom surface of the lower main body 6, and a valve seat 15 on which the main valve 14 is seated is provided on the opening circumference 6 a. ing. A water passage 16 is formed between the outer peripheral surface of the small diameter portion of the main valve 14 and the inner peripheral surface of the lower main body 6 to guide the water flowing in from the inlet 2 to the outlet 3.

An operation rod 18 is attached to the lower surface of the knob 13 by an operation unit 17. The lower end of the operation rod 18 extends into the pressure chamber P through a hole formed in the cup-shaped case 10 and the partition wall 9, and a pilot valve 19 is integrally formed in a portion extending into the pressure chamber P. .

  A pipe member 20 serving as a pilot hole extends downward from the pilot valve 19, and the lower end of the pipe member 20 is connected to the outlet 3 through a hole formed in the main valve 14.

  The pressure chamber P and the inlet 2 communicate with each other through a small hole 21 formed in the main valve 14, and a pin 22 fixed to the upper body 7 is inserted into the small hole 21. The pressure chamber P communicates with the primary inflow port 2 through a gap between the outer periphery and the inner periphery of the small hole 21.

Further, the small hole 21 is provided in parallel with the water passage 16, and a constant flow valve 23 is disposed in the water passage 16. The constant flow valve 23 is urged upward by a spring 24 disposed in the water passage 16 and abuts against a stopper (not shown) formed on the lower body 6, and the main valve 14 is in response to the pressure on the primary side. It moves up and down along the small diameter part.
Thus, since the water flow path 16 is not located on the upstream side with respect to the small hole 21, no pressure loss occurs even if the constant flow valve 23 is arranged in the water flow path 16.

  As shown in FIG. 3, the constant flow valve 23 has an annular shape and a plurality of orifice holes 25 formed around it. A pressure difference is generated between the large diameter portion and the small diameter portion of the main valve 14 by the orifice holes 25. I try to let them.

  Next, the operation of the self-closing valve of the present invention will be described. First, in the water stop state shown in FIG. 1, the pressure of the pressure chamber P acts on the convex part of the U-shaped packing 14a attached to the large diameter part of the main valve 14, and the concave part of the U-shaped packing 14a acts on the concave part. The primary pressure is acting. At this time, since the pressure in the pressure chamber P is equal to the pressure on the primary side, the convex portion and the concave portion of the U-shaped packing 14a have the same pressure.

As shown in FIG. 4, the knob 13 is pushed down against the return spring 11 from the water stop state.
Then, the operating rod 18 is lowered, the pilot valve 19 integrated with the operating rod 18 is also lowered as shown in FIG. 2A, and the pilot valve 19 is separated from the valve seat as shown in FIG. 2B. . As a result, since the pressure in the pressure chamber P is equal to the primary pressure, the water in the pressure chamber P flows through the pilot hole in the pipe member 20 to the outlet 3 on the secondary side in order to release this pressure. .

  As described above, when the pressure in the pressure chamber P escapes to the secondary side and the pressure in the pressure chamber P becomes equal to the secondary side, the main valve 14 is raised by the primary side pressure received by the large diameter portion of the main valve 14. As a result, as shown in FIG. 5, the main valve 14 is separated from the valve seat 16 and the water passage is opened. However, in the case of the present invention, since the constant flow valve 23 is arranged in the water passage, a constant amount of water flows from the inlet 2 to the outlet 3 by the constant flow valve 23.

  On the other hand, when the hand is released from the knob 13, the pilot valve 19 is moved upward by the elastic force of the return spring 11 and is seated on the valve seat, and the communication state by the pilot hole is closed. Furthermore, since the primary pressure gradually fills the pressure chamber P through the small hole 21, the main valve 14 gradually descends along with this, and after a predetermined time has elapsed, the main valve 14 is seated on the valve seat 16 to stop the water. Return to state.

  FIG. 6 is a diagram showing an example in which the water discharge time is changed in the same embodiment. In this embodiment, the screwing amount of the upper body 7 with respect to the lower body 6 is increased. Thereby, the stroke of the main valve can be changed and the water discharge time can be adjusted. That is, as shown in FIG. 6, when the screwing amount is increased and the stroke is shortened, the water discharge time is shortened.

The longitudinal cross-sectional view of the main valve and pilot valve of the self-closing valve which concern on this invention in a closed state (water stop state) An enlarged cross-sectional view explaining details of the pilot valve and the structure around the valve seat (A) is a plan view of a constant flow valve, (b) is a cross-sectional view of the constant flow valve Longitudinal sectional view of a self-closing valve with the pilot valve opened from a water stoppage state Vertical section of a self-closing valve with the main valve open Longitudinal sectional view of the self-closing valve with the main valve stroke set small

Explanation of symbols

P ... Pressure chamber 1 ... Faucet body, 2 ... Inlet, 3 ... Outlet, 4 ... Inner space, 5 ... Opening, 6 ... Lower body constituting self-closing valve body, 6a ... Opening connected to outlet, 7 ... upper body constituting self-closing valve body, 8 ... opening connected to inflow port, 9 ... partition wall, 10 ... cup-shaped case, 11 ... return spring, 12 ... nut, 13 ... knob, 14 ... main valve, 15 ... Valve seat, 16 ... water passage, 17 ... operation part, 18 ... operation rod, 19 ... pilot valve, 20 ... pipe member, 21 ... small hole, 22 ... pin, 23 ... constant flow valve, 24 ... spring, 25 ... orifice hole .

Claims (3)

A main valve that can be attached to and detached from the valve seat, a pressure chamber that is provided in a region opposite to the valve seat across the main valve, and that applies water pressure to the main valve; A small hole for introducing pressure into the pressure chamber, a pilot hole for communicating the pressure chamber and the secondary side flow path to open the primary pressure in the pressure chamber to the secondary side flow path, and a pilot for opening and closing the pilot hole A self-closed valve for supplying water from the primary side flow path to the secondary side flow path for a predetermined time according to the pressure fluctuation in the pressure chamber, and a return spring that applies a biasing force in the direction in which the pilot valve is seated A self-closing valve characterized in that in the valve, an opening connected to the primary side flow path is provided, and a constant flow valve is provided in a water passage for supplying water from the opening to the valve seat of the main valve. 2. The self-closing valve according to claim 1, wherein the self-closing valve includes an upper body and a lower body, and a large diameter portion of the main valve is slidably fitted in the upper body to form a pressure chamber. The small diameter portion of the main valve faces the lower main body, the small hole is formed through the large diameter portion of the main valve, and the water passage is formed between the outer periphery of the small diameter portion of the main valve and the inner periphery of the lower main body. A self-closing valve characterized by being formed. 3. The self-closing valve according to claim 1 or 2, wherein the pilot valve is provided with a pipe member that defines a pilot hole, and the pipe member is connected through a through hole formed in the axial direction of the main valve. A self-closing valve that extends to a secondary flow path.