JPH07136644A - Water purifier - Google Patents

Abstract

PURPOSE:To prevent the occurrence of unpleasant noise, in a water purifier having an emitting joint having a back flow preventing device built therein, by constituting the back flow preventing device of a valve disc and a valve case housing a stopper preventing the flying-out of the valve disc and providing the opening part formed to the valve case at an eccentric position. CONSTITUTION:The residual chlorine or offensive smell in raw water such as tape water is removed by activated carbon in a cartridge and the fine dust such as iron rust therein is removed by hollow yarn membranes to obtain purified water which is, in turn, discharged from the purified water emitting port 5a of a cartridge case through an emitting joint. The emitting joint has a back flow preventing device 20 and the valve disc 21 thereof is raised by the pressure of the purified water flowing in the joint to be stopped at the position of a stopper 23 and purified water passes through the outer peripheral part of the stopped valve disc 21. In this case, the opening part 23a of the stopper 23 is provided so as to be eccentric with respect to the center of a valve case 22. By this constitution, the valve disc 21 is stopped at a predetermined position by utilizing the flow of purified water to prevent the generation of unpleasant noise caused by the vibration of the valve disc 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backflow prevention device for a water purifier for purifying drinking water such as domestic tap water.

[0002]

2. Description of the Related Art As a conventional technique relating to a backflow prevention device for a water purifier, as described in Japanese Patent Application No. 4-23540, a valve seat having a water sealing surface, a movable spherical valve element, and a valve element protruding The valve case is configured to accommodate a stopper having an opening portion as a water passage for prevention, and the opening portion is configured by a cross-shaped rib with the center of the valve case as an axis.

[0003]

In the structure of the above-mentioned conventional example, since the valve case, the stopper, and the valve body, which are the main components of the backflow prevention device, are symmetrical with respect to the axis of the water passage, the water flow is prevented. At the same time, the vortex generated above the valve body causes turbulence in the valve case, and due to momentary imbalance of water pressure, the valve body violently moves inside the valve case and collides with the inner surface of the valve case. There was a problem that occurs.

In view of the above problems, an object of the present invention is to prevent abnormal noise from the backflow prevention device.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a structure of a backflow prevention device, which includes a valve seat having a water sealing surface, a movable valve element, and a water passage for preventing the valve element from popping out. The valve case is configured to accommodate a stopper having an opening, and the opening is eccentric with respect to the center of the valve case.

Further, the valve element has a spherical shape, and when the valve element receives the resistance of the water flow, the valve element is held in contact with three points inside the opening, and the triangle connecting the three points with which the valve element contacts. The center of the valve body is located inside the.

[0007]

According to the present invention, by making the opening of the stopper eccentric with respect to the center of the valve case,
Since the water flow tries to flow to the eccentric opening with low resistance, the valve body rises in the valve case due to the pressure of the water flow and stops at the position of the opening of the stopper. Moreover, the valve body is always
It contacts three points inside the opening, and the center of the valve element is always located inside the triangle connecting the three points. That is, the valve body is always pressed against the opening of the stopper, and the valve body stands still in the valve case. Therefore, it is possible to suppress the generation of abnormal noise due to the vibration of the valve body.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of the water purifier 1. With this, first, the overall configuration will be described.

The inlet 2 having the raw water outlet 2a is fixed to the base 3. The cartridge 4 is formed by a cartridge case 5 having a purified water discharge port 5a and a cartridge cap 6 having a raw water inlet 6a at the upper part,
Activated carbon 7 made of coconut husks and the like as filter medium and opening 8a
The hollow fiber membrane 9 housed in the case 8 having the above is incorporated.

The hollow fiber membrane 9 is bent and inserted into the case 8, and is fixed to the upper end portion 8b of the case 8 with a resin. The hollow fiber membrane 9 is formed by bundling pipe-shaped threads having a large number of openings of about 0.1 μm on the outer surface.

In order to prevent the activated carbon 7 from flowing out, an inlet filter 10 is attached to the cartridge cap 6, and an outlet filter 11 is attached to the case 8.

A cartridge cap 6 of the cartridge 4 is screwed into the inlet 2 and fixed to the base 3.

The inlet 2 has an L-shaped inlet joint 12
Is attached and is connected to a water tap 50 for supplying raw water by a hose 13. The inlet joint 12 and the hose 13 are fixed by a hose joint 14 and a connection nut 15.

A discharge joint 16 incorporating a backflow prevention device 20 is attached to the purified water discharge port 5a, and an upper case 30 is provided.
It is fixed to the cartridge case 5 by means of and is connected by a hose 17 to a water tap 50 for discharging purified water. The discharge joint 16 and the hose 17 are the hose joint 18 and the connection nut 1.
It is fixed by 9.

Next, the structure of the backflow prevention device 20 will be described in detail with reference to the enlarged view of the backflow prevention device 20 shown in FIG. 2 and the perspective view of the backflow prevention device 20 shown in FIG.

The backflow prevention device 20 includes a movable valve body 21 for preventing the backflow of the purified water discharged from the purified water discharge port 5a, and a valve seat for preventing the purified water from flowing back by closely contacting the valve body 21.
It is composed of a valve case 22 having 22a and a stopper 23 for preventing the valve body 21 from popping out.

The stopper 23 has an opening 23a which is eccentric with respect to the center of the valve case 22.

Next, the operation will be described with reference to FIGS.

By opening the water tap 50 dedicated to the water purifier, the raw water of the tap water is once sent to the water tap 50, passes through the hose 13 and flows into the cartridge 4 through the inlet joint 12 and the inlet 2.

After the residual chlorine and odor are removed by the activated carbon 7 in the cartridge 4, it flows in through the opening 8a of the case 8. The raw water flowing in from the opening 8a is purified water by removing fine dust such as iron rust by the hollow fiber membrane 9 housed in the case 8. The purified water flows into the discharge joint 16 via the purified water discharge port 5a of the cartridge case 5. The purified water that has passed through the discharge joint 16 passes through the hose 17, returns to the water tap 50 again, and is discharged from the nozzle 51 of the water tap 50 to the outside.

Next, the operation of the backflow prevention device 20 of the present invention will be described with reference to FIGS.

The purified water that has passed through the purified water discharge port 5a flows into the backflow prevention device 20 of the discharge joint 16. The valve body 21 rises due to the water pressure of the inflowing purified water, and stands still at the position of the stopper 23 as shown in FIG. The purified water that has flowed in passes through the outer peripheral portion of the valve body 21 that is stationary at the position of the stopper 23 and flows into the hose 17.

When the water tap 50 is closed, the valve body 21, which is stationary at the position of the stopper 23, is pushed down by the hydraulic head pressure inside the hose and descends. As shown in FIG. 2, the valve seat 22a of the valve case 22 is positioned at the position. To stand still. Since the valve body 21 comes into close contact with the valve seat 22a by the head pressure, purified water cannot flow back into the cartridge 4. For example, when the cartridge 4 is replaced due to its service life or the like, even if the upper case 30 is removed and the discharge joint 16 is removed from the purified water discharge port 5a of the cartridge case 5, the residual water in the hose 17 is backflowed by the backflow prevention device 20. Therefore, the cartridge 4 can be replaced without wetting the surroundings.

Next, the operation of the backflow prevention device 20 of the present invention will be described in detail.

In many conventional backflow prevention devices, as shown in FIG. 5, a valve case 22, a stopper 23, and a valve body 21, which are main components of the backflow prevention device 20, are symmetrical with respect to the axis of the water passage. Therefore, at the time of water flow, a vortex generated above the valve body 21 causes a turbulent flow in the valve case 22, and due to an instantaneous imbalance of the water pressure, the valve body 21 moves to the valve case 2.
By violently moving inside 2, there was a case where an abnormal noise was generated because it collided with the inner surface of the valve case 22.

Therefore, according to the present invention, as shown in FIG. 4, the opening 23a of the stopper 23 for preventing the valve body 21 from popping out is eccentric with respect to the center of the valve case 22. As a result, the purified water tends to flow into the opening 23a having a low resistance, so that the valve body 21 stands still at the position of the opening 23a from which the purified water is discharged. Moreover, as shown in FIG. 6, the valve element 21 contacts three points inside the opening 23a, and the center of the valve element 21 is always located inside the triangle connecting the three points.

That is, the valve body 21 is always pressed against the opening 23a side of the stopper 23, and the valve body 21 stands still in the valve case 22, so that abnormal noise is generated by the vibration of the valve body 21. Can be suppressed.

[0029]

According to the present invention, since the valve body in the valve case can be stationary in a stable manner, it is possible to prevent abnormal noise from being generated from the backflow prevention device due to the vibration of the valve body.

[Brief description of drawings]

FIG. 1 is an overall sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a backflow prevention device.

FIG. 3 is an exploded perspective view of a backflow prevention device.

FIG. 4 is an operation explanatory view of the backflow prevention device.

FIG. 5 is a cross-sectional view of a conventional backflow prevention device.

FIG. 6 is a P view of FIG.

[Explanation of symbols]

1 ... Water purifier, 20 ... Backflow prevention device, 21 ... Valve body, 22 ...
Valve case, 22a ... Valve seat, 23 ... Stopper, 23a ...
Aperture.

Claims (3)

[Claims] 1. A water purifier comprising a cartridge for containing a filter medium, a base for fixing the cartridge, and a discharge joint incorporating a backflow prevention device, wherein the backflow prevention device comprises a valve seat having a water sealing surface, and a movable valve. A water purifier characterized by comprising a valve case that accommodates a stopper having a body and a valve body to prevent the body from popping out and has an opening as a water passage, and the opening is eccentric with respect to the center of the valve case. . 2. The valve body is spherical, and when the valve body receives resistance, the spherical valve body outer peripheral portion is held in contact with three points inside the eccentric opening. The water purifier according to claim 1. 3. When the valve body is held in contact with three points, the center of the valve body is located inside a triangle connecting the three points when viewed from above. Water purifier according to 1.