JP2703186B2 - 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 a water purifier for filtering drinking water, and more particularly to a water purifier having a drain valve for appropriately removing water remaining in the water purifier after being filtered. It is.

[0002]

2. Description of the Related Art In recent years, hollow fiber membranes formed by bundling porous hollow fibers having countless micropores have been widely used as filter media for filtering drinking water. A hollow fiber membrane is a type of filter that filters water using micropores on the hollow fiber wall surface.In use, water permeates through the wall surface from outside the hollow fiber and flows into the hollow fiber. Dust in the water is filtered, and the water that has flowed into the hollow fiber flows out through the opening at the end of the hollow fiber. Hollow fiber membranes have the advantage of filtering bacteria as well, since the micropores are as small as 0.01-0.1 microns. However, water with reduced residual chlorine and dissolved oxygen filtered by the hollow fiber membrane is in a state where anaerobic bacteria are easy to propagate, so it proliferates and generates gas such as hydrogen sulfide, and the water purifier There was a problem that an unpleasant odor was generated in the remaining filtered water.

Therefore, a drain valve for draining water in the water purifier to the outside of the water purifier has conventionally been provided. FIG. 9 is a cross-sectional view of a water purifier provided with a conventional drain valve shown in Japanese Utility Model Laid-Open No. 5-67876. The cartridge 54 includes a plurality of hollow fiber membranes 57 each having one end surface 55 fixed with a resin 56 in an open state, a partition mesh 58, an activated carbon 59,
A bottom cover 60 made of a mesh or a non-woven fabric is used.

[0004] The supplied water is supplied to a cartridge 54.
The cartridge 54 enters the cartridge 54 from the bottom lid 60 through the gap between the container body 62 and the cartridge case 63, and the activated carbon 59
It comes out of the fresh water outlet 64 of the container main body 62 through the layer, the partition mesh 58 and the hollow fiber membrane 57. The container body 6
The water drain valve 65 and the air valve 66 described with reference to FIG. 9 are incorporated in FIG. 2, and when the raw water is supplied, the pressure in the water purifier rises, and the ball 67 of the air valve 66 closes the air port 68, The drain valve 65 is also closed. Next, when the supply of the raw water stops, the pressure in the water purifier decreases, and the ball 67 of the air valve 26 moves to open the air port 68, and at the same time the drain valve 65 opens to drain the water inside.

[0005]

By the way, the air valve 66
When the ball 67 moves and the air port 68 is opened, the drain valve 65 is opened and the water inside is discharged. However, in the water purifier having such a configuration, the air entering through the air port 68 is used. As a result, the residual water in the vessel is pushed, flows through the hollow fiber membrane 57, and is drained from the drain valve 65 located ahead of the hollow fiber membrane 57. However, at this time, the water head pressure generated by the height difference between the air port 68 and the drain valve 65 is small, and when the drain valve 65 is opened, the air flowing from the drain portion of the drain valve 65 will flow out of the water purifier. A negative force is applied to the water, and the drainage speed is reduced. Therefore, a sufficient suction force for passing through a fine channel such as a hollow fiber membrane is not generated, and water remains inside the water purifier. As described above, when the water filtered by the hollow fiber membrane remains in the water purifier, the filtered water generates an off-flavor due to anaerobic bacteria due to a low residual chlorine and dissolved oxygen.
Therefore, after a certain period of time, the off-flavor generated on the downstream side of the hollow fiber membrane cannot be absorbed, and the off-flavor is generated in the filtered water, which is a problem.

In the conventional example, as shown in FIG. 10, a rubber valve 71 having a drain hole 75 is provided with a drain port 72.
It is provided at the upper part, and when draining filtered water, the drain valve 6
The rubber valve 71 is bent by water flowing down from the communication port 73 so as not to be drained from the port 5, and abuts against the sealing surface 74 to close the water drain port 72, thereby preventing water from leaking from the communication port 73. However, since the rubber valve 71 used for the drain valve 65 of the above-mentioned conventional water purifier is a disk type, water from the communication port 73 easily escapes around on the upper surface of the rubber valve 71, and the drain hole 7
5 and there was a problem with airtightness.

[0007] The present invention has been made to solve the above-mentioned problems, and has as its object to provide a water purifier that drains water remaining in the water purifier without leaving it in the water purifier. I do. Another object of the present invention is to provide a water purifier having a drain valve with excellent liquid tightness when supplied water is filtered and discharged.

[0008]

The water purifier of the present invention comprises: a hollow fiber membrane chamber for holding a hollow fiber membrane as a filter medium; a supply path for supplying water from the water pipe to the hollow fiber membrane chamber;
A water purifier having a water discharge passage for discharging water filtered in the hollow fiber membrane chamber, comprising a drain valve provided in the middle of the supply path to eliminate residual water in the water purifier; The drain valve is provided at a lower end of the water purifier main body, and a drain tube extending outside the water purifier is connected to a drain port of the drain valve.

Preferably, in the water purifier of the present invention, the drain valve is provided on a drain valve body formed of a cylinder formed by opening an upper end and a lower end, and on a side surface of the drain valve body. An inflow port through which water flows into the drain valve body, a discharge port provided at the lower part of the drain valve to discharge water from the drain valve body, and an upper end opening part of the drain valve body, which is provided in the lower part. A cup provided with a drainage plug having an inflow window formed so that water flows into the formed cylindrical hollow portion from the outer peripheral portion and a receiving surface for receiving water flowing out of the cylindrical hollow portion below the drainage plug. It has a valve body of a mold, and a spring fitted between the valve seat and the valve body to separate the valve body from the valve seat formed below the valve body.

[0010]

In the water purifier of the present invention, tap water supplied from the supply channel is filtered out by the hollow fiber membrane in the hollow fiber membrane chamber, and is output to the outside through the drainage channel in a state where bacteria and the like are removed. On the other hand, when not in use, the residual water in the water purifier is removed from another drainage port by a drainage valve provided in the middle of the supply path, but is extended outside the water purifier at the drainage port of the drainage valve. The water head increases the head pressure, increases the drainage capacity of the residual water in the water purifier, and further increases the drainage efficiency by the drain valve provided at the lower end of the water purifier main body. In the water purifier of the present invention, when the supplied water passes through the drain valve, the water enters the drain valve body from the inflow port, flows into the inflow window from around the drain valve, and then drains the water. The water flows down from the lower end of the stopper to the receiving surface of the cup-shaped valve body, closing the drainage hole against the spring force that urges the valve body.However, the water flowing down to the valve body hits the cup-shaped receiving surface. Momentum from the water received by the body can be obtained large, and it is pressed against the valve seat provided in the drain hole against the spring force in a liquid-tight manner, so that water leakage to the drain hole is eliminated and the next To the flow path.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A water purifier according to an embodiment of the present invention will be described below with reference to the drawings. Here, FIG. 1 shows the entire configuration of the water purifier 2 in a partial cross-sectional view. As shown in the figure, a filter cartridge 1 is detachably attached to a main body. Although the structure of the filter cartridge 1 will be described later in detail, this filter cartridge 1 has two hollow fiber membrane chambers 21A and 21A.
B. Also, the hollow fiber membrane chamber 21
A nonwoven fabric filter 4 is disposed above A, 21B.

The water purifier 2 has an input port 25 for water at the lower part on both left and right sides of the water purifier 2, and an output port 24 for water on the upper surface of the water purifier 2. Only one of the input ports is used, and the other is used with the stopper plugged, depending on the positional relationship between the water purifier 2 and the water pipe. Input port 25
A tube is connected from the water pipe to the
Is provided with an outlet tube 8. A water passage is provided in the water purifier 2 from the input port 25 to the output port 24. FIG. 2 is a partial cross-sectional perspective view schematically showing the flow of a water channel in the water purifier 2. Therefore,
The supply path A extends from the input port 25 to the hollow fiber membrane chambers 21A and 21B, and the drainage path B extends from the hollow fiber membrane chambers 21A and 21B to the output port 24 (in FIG. The configuration is partially omitted, and only the position of the drain valve 7 is shown.)

On the other hand, a flow meter 6 is attached to the lower right part of the water purifier 2. At the lower portion, a drain valve 7 is provided in the middle of the supply path A along with the flow meter 6, and a drain tube 7a is connected to the drain valve 7 and extends further downward outside the water purifier 2. , Is fixed such that its tip is located at the lower end of the kitchen sink (not shown). That is, the tip of the drain tube 7a is fixed to a position about 200 mm below the water purifier 2 by a fixture (not shown) so that the drain tube 7a hangs down along the side wall of the kitchen sink. Further, the diameter of the drainage tube 7a is 2 to 6 mm. If the size is larger than this, the flow of the drained water is hindered by the inflow of a large amount of air into the drainage tube 7a, and conversely, if it is smaller than this, the viscosity of the water also causes the flow. This is because the flow of water is obstructed. In addition, the hollow fiber membrane chamber 2
The granular activated carbon 5 is disposed in a space between the outer walls 1A and 21B and the inner wall of the main body of the filter cartridge 1.

Next, the configuration of the filter cartridge 1 will be described. FIG. 3 shows a sectional view of the filter cartridge 1. In the filter cartridge 1, the lower case 11 and the middle case 12 are fitted together, and the middle case 12 and the upper case 18 are fitted together to form an entire outer case. A water inlet port 9 and a water outlet port 10 are formed in the lower case 11. Further, the filter cartridge 1
The middle plate 19 separates the filter into two right and left filters.

Since the main parts of the filter cartridge 1 are symmetrical, only the right part will be described, and the description of the left part will be omitted. Hollow fiber membrane chambers 21A and 21B accommodating the hollow fiber membrane 3 are provided at the center.
Here, the hollow fiber membrane 3 is a kind of filter that filters water using micropores on the hollow fiber wall surface. The function of the hollow fiber membrane is that when used, water penetrates the wall from outside the hollow fiber and flows into the hollow fiber.At that time, the dust in the water is filtered, and the water flowing into the hollow fiber is removed at the end of the hollow fiber. It flows out through the opening (lower side in the figure). The hollow fiber membrane 3 has a pore size of 0.01 to
Since it is as small as 0.1 micron, it has the advantage of filtering bacteria, iron rust, mold and nigori that cannot be removed with activated carbon.

A resin mesh filter 22 is provided above the hollow fiber membrane chambers 21A and 21B. A hole communicating with the water outlet port 10 is provided at a position opposing the center of the middle case 12, and the housing part of the hollow fiber membrane 3 and the water outlet port 10 are in communication. A donut-shaped lower filter 14 is fixed around the hole by a lower filter retainer 13. A hollow cylindrical space between the outer walls of the hollow fiber membrane chambers 21A and 21B and the inner wall of the upper case 18;
The granular activated carbon 15 is accommodated in the upper part of 4. As the granular activated carbon 15, granular activated carbon having a particle size of 42 to 80 mesh is used. Above the granular activated carbon 15, a mixed activated carbon 17 is stored. Mixed activated carbon 17
Is a granular activated carbon having a particle size of 42 to 80 mesh and 30 to 8
It is a mixture of coral powder having a particle size of 0 mesh.

Next, the drain valve will be described. The drain valve 7 is integrally formed with the safety valve 35, and is connected to the hollow fiber membrane chambers 21 </ b> A,
It is provided in the middle of the supply path A where water is supplied to 1B. Here, FIG. 4 is an exploded perspective view of the drain valve and the safety valve, and FIG. 5 is a side view of the drain valve and the safety valve. FIG. 6 is a side sectional view of the drain valve and the safety valve.
FIG. 6 shows an AA ′ cross section and a BB ′ cross section in FIG. 5, in which an upper drain valve section is indicated by an AA ′ cross section sectioned by a C line.

The drain valve body 31 of the drain valve 7 is composed of a plurality of cylinders. First, a drain plug portion 32 having an opening for forming a drain plug is formed at an upper portion, and a flow passage hole 51 is formed vertically downward. In the middle of the flow path hole 51, an inflow port 33 which is a connection portion to the supply path is provided. Below this, an inlet 34 for the safety valve is provided. The inflow port 33 is provided at an upper portion of a valve adapter 40 described later, and the inflow port 34 of the safety valve is provided at a lower portion thereof. The flow passage is divided into a flow passage hole 51 forming the drain valve 7 and a flow passage hole 51a forming the safety valve. On the other hand, the safety valve 35 is formed in a communication portion formed between the inlet 34 of the safety valve and the supply hole 51a.
The drain hole 51b is bent vertically similarly to the supply hole 51a, and is formed up to a communication portion. In the communication portion, the supply hole 51a and the drain hole 51b communicate with each other. Further, the drain hole 51b is formed with a drain port 36 at a tip bent vertically downward in front of the communication portion.

The drain plug 32 of the drain valve body 31 includes:
A plug member 38 having an O-ring 37 is inserted from above. The plug member 38 is formed of a hollow cylinder having the same diameter as the inner diameter of the flow passage hole 51 so that the upper portion 38a is fitted into the flow passage hole 51. It is composed of a hollow cylinder having a diameter of. And
The lower portion 38c is a hollow cylinder having the same diameter as the upper portion 38a. A pair of flat surfaces is formed on the side surface except for a base portion at the lower end, and an inflow window 38m communicating with the internal space is formed on the flat surface. A spring 3 is provided below the plug member 38 from below.
A valve adapter 40 biased upward by 9 is provided. And the stopper member 38 is located at the upper end of the drain stopper 32,
That is, it is fixed to the upper end of the drain valve body 31 with the screw 52,
The above-mentioned series of members are arranged at predetermined positions. The structure of the valve adapter 40 will be further described later.

FIG. 7 is a sectional view of the safety valve 35 taken along the line BB 'shown in FIG. The safety valve 35 has a valve seat 41 fitted with a valve spring 42 inserted into a supply hole 51a. An O-ring 43 made of rubber is fitted into the opening of the elliptical safety valve 35, and the opening is closed with a blind plug 44 attached by a screw 45. In the safety valve 35, the other end of the valve spring 42 fitted to the valve seat 41 is fixed to the blind plug 44, and the valve seat 41 is arranged at a predetermined position. That is, the valve seat 41 is normally urged by the valve spring 42, and the inflow port 34 of the safety valve is provided.
The passage communicating with is blocked. And the valve seat 41
When the water pressure exceeds a certain value, the valve seat 4
1 compresses the valve spring 42 so that the inflow port 34 and the drain hole 36 of the safety valve communicate with each other. In the present embodiment, the water pressure is set to ² kg / cm ^{2 at} which the communication between the inflow port 34 and the drain hole 36 of the safety valve starts.

Next, the valve adapter 40 will be described in detail. FIG. 8 is a side view of the valve adapter 40. The valve adapter 40 has a cup-shaped valve adapter body 46, and an O-ring 47 made of rubber is fitted in a reduced diameter portion at the lower end thereof. A rectangular window 48 penetrated is formed on all sides of the inclined side surface of the valve adapter body 46. A projecting portion 49 is formed at the upper end of the valve adapter body 46 so that a spring 39 urged from below contacts the spring 39. The valve adapter 40 having such a shape is
It is formed of resin such as plastic.

The valve adapter 40 having such a configuration is
Although it is urged upward by the spring 39, further movement is restricted because its upper end is in contact with the lower end of the plug member 38. On the other hand, below the valve adapter 40, the diameter of the drain hole 51b is reduced, and the bank 50 is formed so that the end of the spring 39 having a diameter larger than the diameter is fixed. The spring 39 is fitted on the outer periphery of the bank portion 50, and the O-ring 4 fitted on the valve adapter 40 is fitted on the inner periphery when the valve adapter 40 is lowered.
7 comes in contact with the liquid tight.

The operation of the water purifier 2 having the above configuration will be described below. The water that has entered from the input port 25 passes through the drain valve 7 (the valve adapter 40 is lowered), and is branched into two hands under the filter cartridge 1.
It flows into the two hollow fiber membrane chambers 21A and 21B through the granular activated carbon 5 and the nonwoven fabric filter 4. The water flowing out of the hollow fiber membrane chambers 21A and 21B joins under the filter cartridge 1 and flows out of the outlet tube 8 of the outlet port 24 through the flow meter 6. The flow meter 6 measures the flow rate of tap water flowing through the water purifier 2,
When the usage limit of the filter cartridge 1 is approaching, a display for instructing replacement is performed. Filter cartridge 1
Can be easily removed and attached to the water purifier 2, and the user can always replace the filter cartridge 1 with the exchange display to supply clean water.

Next, the operation of the filter cartridge 1 having the above configuration will be described along the flow of water. Tap water that has entered through the water inlet port 9 immediately branches right and left and goes to the left and right hollow fiber membrane chambers 21A and 21B. The reason why the two hollow fiber membrane chambers are used is that the filtering ability of the hollow fiber membrane 3 is low and only one hollow fiber membrane cannot be filtered when a large amount of tap water is flowed. The branched tap water passes through the lower filter 14 and enters the granular activated carbon 5. here,
The lower filter 14 is for removing dust in tap water.

The granular activated carbon 5 absorbs chlorine components in tap water. Chlorine kills 99% of bacteria in tap water, and it is indispensable to add chlorine to tap water for supply of tap water, but when used as a drink, chlorine produces an unpleasant odor. Reduce. Therefore, the chlorine contained in the tap water is absorbed by the granular activated carbon 15. Then, the water passes through the mixed activated carbon 17, and the coral mixed in the mixed activated carbon 17 adds a mineral component to the water.

Further, the water that has passed through the resin mesh filter 22 flows into the hollow fiber membrane 3. The operation of the hollow fiber membrane 3 is as follows.
During use, water flows from the outside of the hollow fiber into the inside of the hollow fiber through the micropores on the wall surface. Here, the micropores of the hollow fiber membrane 3 are equal to 0.
Since it is as small as 01-0.1 micron, it also filters bacteria, iron rust, mold and nigori. Then, dust and bacteria in the water are filtered, and the water that has flowed into the hollow fiber flows out of the opening at the end of the hollow fiber. The water that has passed through the inside of the hollow fiber membrane 3 and has flowed out of the opening merges with the water that flows out of the left-hand hollow fiber membrane chamber 21B and flows out of the water discharge port.

Next, the operation of the drain valve 7 will be described. When water was supplied from the faucet into the water purifier 2, the water in the water purifier 2 circulated due to the pressure of the water flowing out of the faucet, and was drained from the outlet tube 8. At this time, the water that has flowed to the drain valve 7 enters the drain valve main body 31 from the supply path A connected to the inflow port 33, and the plug member 3
8 flows downward around the intermediate portion 38b, enters into the lower portion 38c of the plug member 38 from the inflow window 38m, flows downward, and flows into the valve adapter 40. Then, the water is supplied to the valve adapter 40.
From above, and out through a window 48 formed in the side surface. Then, the valve adapter 40 is pressed down against the urging force of the spring 39 by the pressure of the water flowing from above, and the O-ring 47 is liquid-tightly joined to the bank portion 50 to close the drain hole 51b. Therefore, the water is drain 3
It does not flow to the side 6 but flows to the filter cartridge 1 side.

Although a part of the water also flows to the safety valve 35 side, the water is stopped because it is shut off by the valve seat 41. However, when the supplied water pressure becomes high, the pressure applied to the valve seat 41 also increases, and the valve seat 41 moves toward the blind plug 44 against the urging force of the valve spring 42.
Retreat. The valve seat 41 is retracted by a predetermined distance, the inflow port 34 of the safety valve communicates with the drain hole 36, a part of the supplied water flows to the drain port 36, and the filter cartridge 1
The flow to the outlet is restricted. Therefore, the flow of water at a high pressure into the hollow fiber membrane that is not so high in pressure resistance is restricted, and a heavy load is prevented from being applied to the water purifier main body due to clogging of the hollow fiber membrane.

On the other hand, when the faucet is closed, the supply of water from the input port 25 stops, and the filtration water supplied into the water purifier 2 stops discharging from the outlet tube 8 through the output port 24. I do. As a result, water that has been supplied and not discharged into the water purifier 2 remains, but this water is drained through the drain valve 7. Specifically, since the flow of the water supplied from the input port 25 is stopped, the inflow of the water from the inflow port 33 to the drain valve 7 is stopped.
Is released from the water pressure that has been pressed against the bank 50 against the urging force of the spring 39, the water is lifted upward by the urging force of the spring 39, and the drain hole 51b is opened. Therefore, the water collected in the water purifier 2 flows backward through the hollow fiber membrane and the flow path, and the water that has entered the drain valve body 31 from the inflow port 33 flows into the drain hole 51 b opened by the rise of the valve adapter 40. . The drain tube 7 connected to the drain hole 36
Flow out to the kitchen sink via a.

The configuration and operation of the embodiment of the present invention have been described above. According to the embodiment, the following effects can be obtained. As described above, in the water purifying water drain valve of the present embodiment, the water drain valve 7 is provided at the lower end of the water purifier 2.
, The water collected from the drain valve 7 through the hollow fiber membrane chambers 21A, 21B and the flow path to the outlet tube 8 has a height from the end of the drain tube 7a to the end of the outlet tube 8. The water is efficiently drained by the head pressure generated by the h. That is, the suction force for discharging the water in the water purifier increases according to the magnitude of the water head pressure, and the magnitude of the water head pressure is determined by the height h in the water purifier as in the present embodiment. Is done. For this reason, in the conventional water purifier, the water is drained without the drain tube. Therefore, in comparison with the present embodiment, the height for determining the water head pressure can be indicated by h ′.

Therefore, as in the present embodiment, the drain tube 7
By dropping a into the kitchen sink, the height can be obtained about 200 mm as compared with the conventional one, and the water is efficiently drained by the corresponding high head pressure. As a result, since the water drain valve 7 is provided at the lower end of the water purifier 2, the water remaining in the water purifier easily flows out, eliminating residual water in the water purifier.
It was possible to eliminate the off-flavor due to the filtered water that easily causes bacteria. Further, in the water draining valve 7 provided in the water purifier in this embodiment, since the shape of the valve adapter 40 is cup-shaped, the momentum of water flowing down from above is efficiently transmitted. Spring 3 biasing
In contrast to the urging force of No. 9, it is strongly pressed against the bank portion 50 which is a valve seat, and the drainage hole 51b is closed by a rubber O-ring 47 at the ground contact portion with the bank portion 50. It has become possible.

By the way, the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the present invention. For example, the shape of the drain valve main body or the shape of the flow path flowing through the main body does not need to be the one described in the above embodiment, and may be made to flow from the upper end of the drain plug.

[0033]

As is apparent from the above description, in the water purifier of the present invention, the drain valve is provided at the lower end of the water purifier main body, and is extended to the outside of the water purifier at the drain port of the water drain valve. Since the drainage tube is connected, it is possible to provide a water purifier drain valve in which the water remaining in the water purifier without being discharged from the faucet is drained from the water outlet without remaining in the container. Was. Further, since the water purifier of the present invention has a cup-shaped valve element of the water drain valve provided in the water purifier, it is possible to provide a water purifier having a water drain valve with excellent liquid tightness. Was.

[Brief description of the drawings]

FIG. 1 is a partial sectional perspective view of a water purifier according to one embodiment of the present invention.

FIG. 2 is a partial cross-sectional perspective view showing a water channel in the water purifier according to one embodiment of the present invention.

FIG. 3 is a sectional view of a filter cartridge of the water purifier.

FIG. 4 is an exploded perspective view of a drain valve and a safety valve of the water purifier according to one embodiment of the present invention.

FIG. 5 is a side view of a drain valve and a safety valve of the water purifier according to one embodiment of the present invention.

FIG. 6 is a side sectional view of a drain valve and a safety valve of the water purifier according to one embodiment of the present invention.

FIG. 7 is a side view of a valve adapter which is a component of a water removal valve for a water purifier according to an embodiment of the present invention.

FIG. 8 is a side sectional view of a safety valve of the water purifier according to one embodiment of the present invention.

FIG. 9 is a sectional view of a filter cartridge of a conventional water purifier.

FIG. 10 is a sectional view of a drain valve of a conventional water purifier.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter cartridge 2 Water purifier 3 Hollow fiber membrane 7 Drain valve 8 Outlet tube 21A Hollow fiber membrane chamber 21B Hollow fiber membrane chamber 31 Drain valve main body 33 Inflow 34 Inflow of safety valve 37 O-ring 38 Plug member 39 Spring 40 Valve Adapter 46 Valve adapter body 47 O-ring 48 Window

Claims (1)

(57) [Claims] 1. A hollow fiber membrane chamber for holding a hollow fiber membrane as a filter medium, a supply path for supplying water from the water pipe to the hollow fiber membrane chamber, and an outlet for discharging water filtered in the hollow fiber membrane chamber. A water drain having a water channel, wherein a water drain valve provided in the middle of the supply channel for removing residual water in the water purifier includes a water drain valve comprising a cylinder formed by opening an upper end and a lower end. A main body, an inflow port provided on a side surface portion of the drain valve main body to allow water to flow into the drain valve main body, and an outlet provided at a lower portion of the drain valve main body to discharge water from the drain valve main body; A drain plug having an inflow window formed inside the upper end opening of the drain valve body and configured to allow water to flow from an outer peripheral portion into a cylindrical hollow portion formed at a lower portion; and a cylindrical hollow at a lower portion of the drain plug. Cup with an upper receiving surface for receiving water flowing from the part In order to separate the valve body of the mold, the valve seat formed below the valve body and the valve body,
A water purifier having a spring fitted between the valve seat and the valve body.