JP3139254B2 - 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 described in JP-open flat 5-261363, a valve case having a water seal face, the valve body movably ball-shaped, A built-in compression spring for pressing the valve body is provided, and a stopper having an opening is welded to the valve case in order to prevent the valve body and the compression spring from jumping out.

[0003]

In the structure of the above-mentioned conventional example, since the valve element is formed in a ball shape, a turbulent flow occurs in the valve case due to a vortex generated above the valve element when flowing water. The instantaneous imbalance of the water pressure causes the valve body to move violently in the valve case, colliding with the inner surface of the valve case, and causing abnormal noise.

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

[0005]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The feature of the present invention is that a cart for storing filter media
A ridge and a backflow prevention device in which the cartridge is directly connected.
Built-in base and purified water outlet for discharging purified water to the outside
In the water purifier equipped with, the backflow prevention device is
Movable self-removal to prevent backflow of raw water supplied to the cartridge
Existing valve body and a water seal in contact with the valve body to prevent backflow of raw water
A valve seat having a surface, and compression for pressing the valve body against the valve seat
The spring prevents the valve from jumping out and opens as a water passage.
Consists of a valve case that houses a stopper with a mouth
The valve body has a water-sealing surface of the valve body having a spherical surface, and has an outer peripheral portion.
In addition to providing a plurality of rib-shaped guides,
Ru Oh <br/> in providing the resistor which is a portion protruding upward in the radial direction.

[0006]

According to the present invention, by providing a plurality of rib-shaped guide portions on the outer peripheral portion of the valve body, the raw water flowing into the valve case is once rectified by the guide portions, and the guide portion of the valve body is connected to the valve. Vibration can be suppressed because the operation of the valve element is stabilized by contacting the inner surface of the case. Also, by providing a resistor partly protruding in the radial direction above the water sealing surface of the valve body, the valve body rises in the valve case by the water pressure of the raw water flowing into the valve case and stops at the position of the stopper, During this operation, when the raw water passes through the inside of the valve case, the flow is obstructed by the resistor of the valve body and tends to flow to the side without the resistor. At this time, the valve body provided with the resistor is pressed against the inner surface of the valve case not provided with the resistor due to the flow resistance of the raw water, and provided on the outer peripheral portion of the valve body. The rib-shaped guide portion comes into contact with the inner surface of the valve case and stops. That is, the valve element is always pressed in one direction, and the valve element stops in the valve case, thereby suppressing generation of abnormal noise due to vibration of the valve element.

[0007]

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, and 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.

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.

An upper case 12 is provided with a water purification case 1 having a water purification port 13a and a slidable water purification pipe 13 mounted thereon.
4 are stored. The upper case 12 is elastically attached to the middle case 15 by the elastic claws 14a of
It is fixed to be rotatable by 60 °. By mounting the middle case 15 on the upper part of the cartridge 4, the water purification case 1
4 and a water passage are formed.

Next, the structure of the water purification case 14 will be described in detail with reference to FIG.

The auxiliary water passage 1 is provided inside the water purification case 14.
4b and a main water passage 14c are formed. Auxiliary water passage 1
4b, the indicator 16 and the indicator 16
And a pressing spring 17 for urging the pressure. The transparent window 18 shown in FIG. 1 is attached to the upper case 12 at a position corresponding to the indicator 16 so that the movement of the indicator 16 can be viewed from the outside.

The main water passage 14c has a bypass port 14d communicating with the purified water discharge port 5a. The main water passage 14c has a structure in which the water purification pipe 13 can slide.

A groove is provided in a part of the water purification pipe 13, and a C-ring 19, which is partially cut, is mounted in the groove. The main water passage 14c and the auxiliary water passage 14b are connected by a case cap 20.

Next, the structure of the backflow prevention device 40 will be described in detail with reference to a partially enlarged view of FIG. Backflow prevention device 40
Is a movable valve body 21 for preventing backflow of raw water supplied to the cartridge 4, as shown in FIGS.
A valve seat 22 having a water sealing surface for preventing the backflow of raw water with the valve element 21 in close contact, a stopper 23 for preventing the valve element 21 from jumping out, and a water sealing property for pressing the valve element 21 and the valve seat 22 And a valve case 2b formed in the inlet 2 accommodating a valve spring 24 for improving the pressure.

Further, a plurality of rib-shaped guide portions 21b are provided on the outer peripheral portion of the valve body 21, and a resistor 21a partially protruding in the radial direction is provided above the water sealing surface.

A plurality of projections 21e are provided on a part of the outside of the rib-shaped guide 21b.

Further, the rib-shaped guide portion 2 of the valve body 21
A ring portion 21d is provided on the upper surface of 1b.

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

When the faucet 50 is opened, the raw water of tap water flows into the cartridge 4 via the inlet 2. 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 purified water case 14 via the purified water discharge port 5a of the cartridge case 5, passes through the auxiliary water passage 14b and the main water passage 14a, and is discharged from the purified water port 13a of the purified water pipe 13.

Next, the operation of the backflow prevention device 40 of the present invention will be described with reference to FIGS. Raw water that has passed through the inlet 2 flows into the backflow prevention device 40. Valve element 21
The water pressure that has flowed raw water rises in the valve case 2b from the time that is greater than the pushing force of the valve spring 24, to rest at a position of the stopper 23 as shown in FIG. The raw water passes through the outer periphery of the valve body 21 that is stationary at the position of the stopper 23, and flows into the cartridge 4 from the raw water inlet 6 a of the cartridge cap 6.

Next, when the faucet 50 is closed, the stopper 2
The valve element 21 that has been stationary at the position 3 is pushed down by the pressing force of the valve spring 24 and descends, and stops at the position of the valve seat 22. Since the valve element 21 is in close contact with the valve seat 22 by the valve spring 24, the raw water cannot flow back to the faucet 50 side.

Next, the operation of the backflow prevention device 40 of the present invention will be described in detail.

According to the present invention, the raw water that is going to pass through the inside of the valve case 2b is obstructed by the resistor 21a of the valve body 21 and tends to flow to the side without the resistor 21a.
At this time, the valve body 21 provided with the resistor 21a is pressed against the inner surface of the valve case 2b not provided with the resistor 21a due to the flow resistance of the raw water, and the valve body 21 The rib-shaped guide portion 21b provided on the outer peripheral portion serves as the valve case 2b.
6 comes into contact with the inner side surface of the vehicle and stops in the state shown in FIG. At this time, the guide portion 21b regulates the flow of the raw water. That is, the valve element 21 is always pressed in one direction, and the valve element 21 is stopped in the valve case 2b, and the flow of the raw water is rectified by the guide portion 21b. And noise can be suppressed.

However, when the valve element 21 has a low water flow (for example, when the cartridge 4 is clogged), the operation of the valve element 21 becomes unstable because the action of the resistor 21a becomes small. is there. On the other hand, as shown in FIG. 7, by providing a plurality of protrusions 21e on a part of the outside of the rib-shaped guide portion 21b of the valve body 21, the valve body 2
Since the contact area between 1 and the inner surface of the valve case 2b can be reduced, generation of abnormal noise at the time of contact due to vibration can be suppressed.

Further, in order to improve the reliability of the water seal of the backflow prevention device 40, the water seal surface 21c of the valve element 21 has a spherical surface.
The valve seat 22 was made of synthetic rubber. Further, by mounting a valve spring 24 for pressing the valve body 21 inside the rib-shaped guide portion 21b of the valve body 21, the water sealing property is further improved.

Further, in order to improve the reliability of the valve body 21, a ring part 21d is provided on the upper surface of the rib-shaped guide part 21b of the valve body 21 to reinforce the guide part 21b to improve dimensional stability. Improved.

[0031]

According to the present invention, the valve element in the valve case can be stopped in a stable manner and the flow of raw water in the valve case can be rectified. Can be prevented from being generated.
In addition, when the amount of water is low, abnormal noise can be prevented by the action of the projection provided on the guide portion of the valve body. Furthermore, the water seal reliability can be improved by the valve spring mounted on the valve body, and the dimensional stability of the valve body is improved by forming the upper surface of the rib-shaped guide portion of the valve body with a ring portion. This results in a highly reliable backflow prevention device.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view of the backflow prevention device of FIG. 1;

FIG. 4 is an exploded perspective view of the backflow prevention device.

FIG. 5 is an enlarged perspective view of a valve body.

FIG. 6 is an explanatory diagram of the operation of the backflow prevention device.

FIG. 7 is an explanatory view of a projection of a valve body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water purifier, 2 ... Inlet, 2b ... Valve case, 21 ...
Valve body 21a Resistor 21b Guide part 21d Ring part 21e Projection part 22 Valve seat 23 Stopper 24 Valve spring 40 Backflow prevention device.

────────────────────────────────────────────────── ─── of the front page continued (72) inventor Michio Owada Hitachi City, Ibaraki Prefecture Higashitaga-cho, 1 chome, Hitachi, Ltd. living equipment business unit (58) investigated the field (Int.Cl. ^7, DB name ) C02F 1/28 F16K 15/00-15/20

Claims (3)

(57) [Claims] A cartridge containing a 1. A filter medium, a base to which the cart <br/> ridge is built directly connected backflow prevention device, the water purifier clean water outlet is mounted for discharging the purified water to the outside, the The backflow prevention device is provided with the raw water supplied to the cartridge.
A movable valve body that prevents backflow of
A valve seat having a water sealing surface for preventing backflow of water;
A compression spring which presses the valve seat, and consists of a valve case accommodating the stopper having an opening as preventing water passage from jumping out of the valve body, the valve body is spherical water sealing surface of the valve body A water purifier comprising: a plurality of rib-shaped guide portions provided on an outer peripheral portion; and a resistor partially projecting in a radial direction provided on an upper portion of a water sealing surface. 2. The water purifier according to claim 1, wherein a plurality of protrusions are provided on a part of an outer side of the plurality of rib-shaped guides provided on an outer peripheral portion of the valve body. 3. The water purifier according to claim 1, wherein a ring portion is provided on an upper surface of the plurality of rib-shaped guide portions provided on an outer peripheral portion of the valve body.