JP3139249B2 - Water purifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing backflow of a water purifier intended for purifying drinking water such as tap water at home.

[0002]

As a conventional art relating to the backflow prevention device for water purifier, as shown in JP-open flat 5-215259 Patent described, the valve seat having a water seal face, the valve body movably spherical, jumping out of the valve body The valve case includes a valve case for storing a stopper having an opening as a water passage, and the opening is formed by a cross-shaped rib centered on the center of the valve case.

[0003]

In the structure of the above-mentioned conventional example, the valve case, the stopper and the valve element, which are the main components of the backflow prevention device, are symmetrical with respect to the axis of the water passage. At times, the vortex generated above the valve body causes turbulent flow inside the valve case, and the instantaneous imbalance in water pressure causes the valve body to move violently inside the valve case, colliding with the inner surface of the valve case, and generating abnormal noise. There was a problem that occurs.

[0004] In view of the above problems, an object of the present invention is to prevent abnormal noise from a backflow prevention device.

[0005]

Means for Solving the Problems] It is a feature of the present invention to achieve the above Symbol object, a cartridge containing the filter medium, a base for fixing the cartridge, from a discharge fitting with a built-in backflow prevention device In the water purifier, the backflow prevention device includes a valve seat having a water sealing surface, and a movable
And the valve element of the spherical, consist of a valve case accommodating the stopper having an opening as preventing water passage from jumping out of the valve body, the opening is decentered with respect to the center of the valve casing Rutotomoni , Formed in a fan shape.

[0006]

[0007]

I to the present invention lever, the valve opening of the stopper cable
Eccentric to the center of the fan, and the shape of the opening is fan-shaped
So that the valve always touches the three points inside the fan-shaped opening.
Since the valve element rests in the valve case in a stable state when touched , generation of abnormal noise due to vibration of the valve element can be suppressed.

[0008]

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. Thus, the overall configuration will be described first.

An inlet 2 having a raw water inlet 2 a is fixed to a base 3. The cartridge 4 is formed by a cartridge case 5 having a purified water discharge port 5a at an upper portion and a cartridge cap 6 having a raw water inlet 6a.
Activated carbon 7 made of coconut, etc. as filter medium and opening 8a
A hollow fiber membrane 9 housed in a case 8 having

The hollow fiber membrane 9 is bent and inserted into the case 8, and is fixed to the upper end 8b of the case 8 using a resin. The hollow fiber membrane 9 is formed by bundling pipe-like 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 mounted on the cartridge cap 6 and an outlet filter 11 is mounted on the case 8.

The cartridge 4 has a cartridge cap 6 screwed to the inlet 2 and fixed to the base 3.

The inlet 2 has an L-shaped inlet joint 12.
Is connected to the water tap 50 for supplying raw water and the 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 having a built-in backflow prevention device 20 is attached to the purified water discharge port 5a.
Is fixed to the cartridge case 5 and is connected to the water tap 50 for discharging purified water by the hose 17. Discharge joint 16 and hose 17 are connected to hose joint 18 and connection nut 1
9 fixed.

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

The backflow prevention device 20 is provided with a movable valve body 21 for preventing backflow of purified water discharged from the purified water discharge port 5a, and a valve seat where the valve body 21 is in close contact to prevent backflow of purified water.
It comprises 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, flows through the inlet joint 12 and the inlet 2, and flows into the cartridge 4.

After the residual chlorine and odor are removed by the activated carbon 7 in the cartridge 4, it flows through the opening 8 a of the case 8. Raw water flowing from the opening 8a is purified by removing fine dust such as iron rust by the hollow fiber membrane 9 stored 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 and 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 element 21 rises due to the water pressure of the inflowing purified water, and stops at the position of the stopper 23 as shown in FIG. The flowing clean water flows into the hose 17 through the outer peripheral portion of the valve body 21 that is stationary at the position of the stopper 23.

When the water tap 50 is closed, the valve body 21 which has been stationary at the position of the stopper 23 is pushed down by the head pressure inside the hose and descends, and as shown in FIG. 2, the position of the valve seat 22a of the valve case 22 is reached. To stop. Since the valve element 21 comes into close contact with the valve seat 22a due to the head pressure, purified water cannot flow back into the cartridge 4. For example, when the cartridge 4 is replaced due to its 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 5 a 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.

As shown in FIG. 5, most of the conventional backflow prevention devices have a valve case 22, a stopper 23 and a valve body 21, which are main components of the backflow prevention device 20, in a symmetrical shape with respect to the axis of the water passage. Therefore, at the time of water flow, the vortex generated above the valve element 21 causes turbulent flow in the valve case 22, and the instantaneous water pressure imbalance causes the valve element 21 to move into the valve case 2.
In some cases, the inside of the valve case 22 violently collides with the inner surface of the valve case 22 to generate noise.

Therefore, according to the present invention, the opening 23a of the stopper 23 for preventing the valve body 21 from jumping out is eccentric with respect to the center of the valve case 22, as shown in FIG. As a result, the purified water tends to flow to the opening 23a having a small resistance, so that the valve body 21 stops 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 element 21 is always pressed against the opening 23a side of the stopper 23, and the valve element 21 stops inside the valve case 22, so that the generation of abnormal noise due to the vibration of the valve element 21 is prevented. Can be suppressed.

[0029]

According to the present invention, since the valve element in the valve case can be stopped in a stable manner, generation of abnormal noise from the backflow prevention device due to vibration of the valve element can be prevented.

[Brief description of the drawings]

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

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

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

FIG. 4 is a diagram illustrating the operation 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. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water purifier, 20 ... Backflow prevention device, 21 ... Valve body, 22 ...
Valve case, 22a ... valve seat, 23 ... stopper, 23a ...
Aperture.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Michio Owada, 1-1-1 Higashitaga-cho, Hitachi City, Ibaraki Prefecture Living Equipment Business Division, Hitachi, Ltd. (56) References JP-A-5-215259 (JP, A JP-A-57-1872 (JP, A) JP-A-61-29173 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) C02F 1/28 F16K 15/00-15 / 20

Claims (1)

(57) [Claims] 1. A water purifier comprising a cartridge for storing a filter medium, a base for fixing the cartridge, and a discharge joint having a built-in backflow prevention device, wherein the backflow prevention device has a valve having a water sealing surface. a seat, a valve body movable freely spherical, consist of a valve case accommodating the stopper having an opening as preventing water passage from jumping out of the valve body, the opening in the center of the valve casing Ru is decentered for
A water purifier characterized by having a fan shape .