JPH08296747A - Valve device - Google Patents

Abstract

PURPOSE: To make fluid easy to flow out of a liquid supply port without enlarging the shifting stroke of a valve. CONSTITUTION: A cap 41 installed on the tank 39 for reserving water provided with a valve seat 43, where a water supply port 42 is made, in condition of being inclined to horizontal direction. The water supply port 42 is opened and closed from above by the valve 48 of the valve body 44. It follows that a film is made by the surface tension of water, accompanying the opening of the valve 48, but this film is asymmetrical above and below, and the balance is lost, and it is apt to break from the lower weak place where water pressure is applied, so water is easy to flow out from the water supply port 42 without enlarging the shifting stroke of the valve 48.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device which opens and closes a liquid supply port by moving a valve up and down.

[0002]

2. Description of the Related Art For example, FIG. 13 shows a conventional structure of a valve device for a water supply tank in an automatic ice making device mounted on a refrigerator. In the figure, a cylindrical tube portion 2 is provided at the bottom of the tank 1.
Is projectingly provided, and a cap 3 is detachably screwed to the cylindrical portion 2. A valve seat 5 having a circular water supply port 4 is provided at the center of the cap 3. And
The cap 3 is provided with a valve shaft 6 that is vertically movable with respect to the valve seat 5, and a circular valve that is attached to the lower end of the valve shaft 6 to open and close the water supply port 4 from above. 7 is provided, and a compression coil spring 9 that biases the valve body 8 in the closing direction (downward) is provided.

In the above structure, the lower end of the valve shaft 6 is pushed up, the valve body 8 is pushed upward relative to the valve seat 5, and the valve 7 moves away from the peripheral edge of the water supply port 4 to supply water. The mouth 4 is opened (see the chain double-dashed line). When the water supply port 4 is opened, the water stored in the tank 1 is
The water will flow downward from the water supply port 4 through the gap between the peripheral edge of the valve and the valve 7.

[0004]

By the way, in such a structure, when the valve 7 moves in the opening direction with respect to the water supply port 4, as shown in FIG. A film A is formed between the upper surface of the seat 5 and the surface tension of water. While the film A is formed, the film A prevents water in the tank 1 from flowing out from the water supply port 4,
As the film A breaks, the water in the tank 1 flows out from the water supply port 4.

However, in the above-mentioned conventional structure, the shape of the valve 7 and the valve seat 5 is symmetrical with respect to the center of the water supply port 4, and when the valve 7 is opened, the periphery of the water supply port 4 and the valve are closed. The gap with 7 is substantially constant over the entire circumference.
Therefore, the film A formed between the lower surface of the valve 7 and the upper surface of the valve seat 5 is formed in a concentric shape centered on the center of the water supply port 4, and has a substantially constant strength over the entire circumference. Since it has a certain thickness, it is hard to be broken and eventually water is supplied to the water inlet 4
It was hard to leak from. Therefore, in the related art, it is necessary to secure a large movement stroke of the valve 7 in order to make the membrane A easy to break, and therefore, a large space is required to install the valve body 8.

Therefore, an object of the present invention is to provide a valve device which makes it easier for liquid to flow out from the liquid supply port without increasing the movement stroke of the valve.

[0007]

In order to achieve the above object, a first means of the present invention is a valve seat provided at a lower portion of a tank for storing a liquid and having a liquid supply port, It is provided so as to be movable in the vertical direction with respect to the valve seat, and closes the liquid supply port by contacting the peripheral portion of the liquid supply port from above,
In a valve device having a valve that opens the liquid supply port by separating upward from the peripheral portion of the liquid supply port, the valve seat is inclined with respect to a horizontal plane.

In order to achieve the same purpose, the second means of the present invention is provided in the lower part of the tank for storing the liquid,
A valve seat having a liquid supply port and a vertically movable seat relative to the valve seat are provided, and the liquid supply port is closed by contacting the peripheral portion of the liquid supply port from above. A valve device having a valve that opens the liquid supply port by being separated upward from the peripheral edge of the valve device, which is located below the valve and is located inside the liquid supply port when the valve is closed. It is characterized in that a protrusion is provided at a portion eccentric from the center of the liquid supply port.

In this case, the protrusion may be formed of a drooping rib, or may have an outer surface having a slope inclined downward toward the center of the liquid supply port.

[0010]

According to the first means, by tilting the valve seat with respect to the horizontal plane, the liquid film formed between the lower surface of the valve and the upper surface of the valve seat when the valve is opened is The lower side and the upper side of the seat have an asymmetrical shape. Further, in this case, there is a difference in the depth of the liquid between the lower side and the upper side of the valve seat, and the pressure of the liquid applied to the membrane is larger on the lower side of the valve seat than on the upper side, and The cross-section coefficient of is smaller in the film formed below the valve seat than in the film formed above.
Therefore, the film formed on the lower side of the valve seat is more liable to break than the film formed on the upper side, and the balance of the film as a whole is lost, and the film is easily broken from a weak place.

The liquid film formed between the valve and the valve seat when the valve is open tends to form the smallest radius circle between the valve and the valve seat. Therefore, in the second means,
The size of the gap between the valve and the valve seat varies depending on the side of the valve having the protrusion and the side not having the protrusion. That is, with the opening of the valve, the gap between the outer surface of the protrusion and the valve seat becomes smaller than the gap between the outer surface of the valve and the valve seat on the side where the protrusion is present. A film is formed between the outer surface of the protrusion and the valve seat on the side where there is. Therefore, the membrane is formed between the outer surface of the valve and the valve seat on the side without the protrusion, but is formed between the outer surface of the protrusion and the valve seat on the side with the protrusion. As a result, the balance of the film as a whole is lost, and the film easily breaks from weak places.

In this case, when the protrusion of the valve is formed by a rib having a hanging shape, it is possible to easily form an unbalanced film. Further, when the projection has a structure in which the outer surface has a slope inclined downward toward the center of the liquid supply port, the film formed on the side where the projection is formed is surely formed along the slope. As a result, it becomes possible to stably form an unbalanced film.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to a valve device for a water supply tank in an automatic ice making device mounted on a refrigerator will be described below with reference to FIGS. First, FIG.
In the figure, a schematic configuration around the automatic ice making device mounted on the refrigerator main body 11 is shown. In FIG. 3, an ice tray 13 and an ice tray 13 are provided in an ice making chamber 12 formed in a refrigerator body 11.
An ice making machine 15 including a drive mechanism 14 that rotatably supports the ice making tray 13 is provided. This ice machine 15
Is formed by cooling the water stored in the ice tray 13 with the cold air supplied into the ice making chamber 12,
On the basis of detecting the ice making completion temperature by a temperature sensor (not shown) provided in the ice tray 13, the drive mechanism 14 inverts and twists the ice tray 13 to release ice. The ice thus formed is stored in the ice storage container 16.

A refrigerating chamber 18 is formed above the ice making chamber 12 via a partition wall 17, and a placing table 19 is provided in the refrigerating chamber 18. A water receiver 20 is integrally provided on the mounting table 19. An outlet 21 is provided at the bottom of the water receiver 20, and the water received by the water receiver 20 is supplied to the ice tray 13 from the outlet 21.

Inside the water receiver 20, as shown in FIGS. 4 and 5, a fixed quantity water reservoir 22 is detachably mounted. This fixed amount water reservoir 22 has a fixed amount, for example, 10
It is configured to be able to store 5 cc of water, and the amount of stored water is set to the optimum amount of water supplied to the ice tray 13. And
A water outlet 23 is formed at the center of the bottom of the fixed quantity water reservoir 22, and the water outlet 23 is configured to be opened and closed by a water outlet valve mechanism 24.

The water outlet valve mechanism 24 is inserted into the water outlet 23 and is supported by a support arm 25 which is erected on the inner bottom surface of the fixed quantity water reservoir 22 so as to be vertically movable.
6 is supported so as to be movable up and down, and the water outlet 23 is connected to the fixed amount water reservoir 2
2 and a valve body 27 that opens and closes from the outside.
The valve rod 26 is configured by abutting an upper valve rod 28 provided on the metered water reservoir 22 side and a lower valve rod 29 provided on the valve body 27 side via a diaphragm 30. Upper stem 2
A compression coil spring 31 is provided between the lower end flange 28 a of 8 and the support arm 25, and the compression coil spring 31 urges the upper valve rod 28 downward. A compression coil spring 32 is provided between the valve body 27 and the lower end flange 29a of the lower valve rod 29, and the compression coil spring 32 urges the valve body 27 upward with respect to the lower valve rod 29. Has been done. An annular soft rubber packing 33 is attached to the opening edge of the water outlet 23 as a sealing material.

A valve drive device 34 is disposed below the water receiver 20. This valve drive device 34 is
An operating shaft 36 that is vertically movable in the case 35 below the lower valve rod 29, a motor (not shown) provided in the case 35, and a cam that converts rotational movement of the motor into vertical movement of the operating shaft 36. It has a mechanism. The operation shaft 36 is inserted through a hole 37 formed in the bottom of the water receiver 20 and is projected upward. The hole 37 is closed by a packing 38 for preventing water outflow, and the operating shaft 36
Is in contact with the lower valve rod 29 through the packing 38. Then, as the operation shaft 36 is moved up and down,
While the lower valve rod 29 and the upper valve rod 28 are moved up and down,
The valve body 27 is also moved up and down.

On the other hand, a tank 39 for storing a liquid, in this case water, is detachably set on the mounting table 19 described above. At the lower part of the tank 39, a tubular portion 40 having a cylindrical shape is provided so as to project downward, and a cap 41 is detachably screwed to the tubular portion 40 as shown in FIG. A valve seat 43 having a water supply port 42 which is a circular liquid supply port is provided in an approximately central portion of the cap 41 in a state of being inclined with respect to a horizontal plane, and the water supply port 42 is provided with a valve body 44.
It is configured to be opened and closed by.

The valve element 44 is attached to a valve shaft 47 which is vertically movably inserted in a shaft insertion portion 46 of a support frame 45 provided in the cap 41, and a water inlet 42 which is attached to a lower end portion of the valve shaft 47.
And a valve 48 in the shape of a circular bowl that opens and closes from above, and is attached to the lower side in the closing direction by a compression coil spring 49 as an urging means provided between the shaft insertion portion 46 and the valve 48. It is energized. In the closed state of the valve 48, the lower surface of the valve 48 comes into contact with the peripheral portion of the water supply port 42 from above to close the water supply port 42. The valve shaft 47 of the valve element 44 is arranged on the same axis as the valve rod 26 of the water valve mechanism 24.

On the lower surface of the cap 41, a cylindrical portion 41a is provided so as to project downward. The outer diameter of the tubular portion 41a is set to be slightly smaller than the inner diameter of the upper surface opening of the fixed quantity water reservoir 22, and the tubular portion 41a forms a gap between the inner peripheral surface of the fixed quantity water reservoir 22. It is inserted in the fixed amount water reservoir 22 in a state.

A water purifier 50 is housed in the tank 39. This water purifier 50 is arranged so as to surround the support frame 45 and has a case 52 in which a water passage port 51 is formed in a peripheral wall portion.
And a cylindrical water purifying filter 53 disposed in the case 52. A cylindrical air vent 54 is provided upright on the top of the case 52. The water purification filter 53 is made of, for example, a non-woven fabric made of fibrous activated carbon, and has a function of purifying water passing through the water purification filter 53.

Next, the operation of the above configuration will be described. In the state of FIG. 4, the water supply port 42 on the tank 39 side is closed by the valve 48. Further, the operation shaft 36 of the valve drive mechanism 34 is at the lower limit position, the upper valve rod 28 on the water discharge valve mechanism 24 side is separated from the valve shaft 47 on the tank 39 side, and the water outlet 23
Is open.

When the operation shaft 36 is moved upward from this state, the valve shaft 26 is pushed up by the operation shaft 36, and the valve body 27 is also pushed up. The water outlet 23 comes to be closed. When the valve rod 26 is further pushed up, the upper end of the upper valve rod 28 comes into contact with the valve shaft 47 on the tank 39 side from below and pushes up the valve shaft 47. Valve shaft 47
Is pushed up, the valve 48 comes to be separated from the valve seat 43 upward.

Here, even when the valve 48 is separated from the valve seat 43, when the moving stroke of the valve 48 is small, as shown in FIGS. 2B and 2C, the lower surface of the valve 48 and the valve 48 are The film A is formed between the upper surface of the seat 43 and the upper surface of the water by the surface tension of the water, and while the film A is formed, the film A prevents the water in the tank 39 from flowing out from the water supply port 42. As the film A breaks, the water in the tank 39 will flow out from the water supply port 42.

In this case, since the valve seat 43 is inclined with respect to the horizontal plane, the valve 48 is opened when the valve 48 is opened.
The film A formed between the valve seat 43 and the valve seat 43 has an asymmetrical shape between the lower side (the right side in FIGS. 2B and 2C) of the valve seat 43 and the upper side. Further, in this case, the lower side of the valve seat 43 is deeper because it is lower than the upper side, and the pressure of water on the membrane A is such that the lower side of the valve seat 43 is higher than the upper side. The cross-section coefficient of the membrane A is larger, and the membrane A formed on the lower side of the valve seat 43 is smaller than the membrane A formed on the upper side. Therefore, the film A formed on the lower side of the valve seat 43 is more easily torn than the film A formed on the upper side, the balance of the film A as a whole is lost, and the film A is easily torn from the lower side. As the operating shaft 36 moves to the upper limit position, the valve 48 also moves to the upper limit position.

When the membrane A breaks, the water in the tank 39 flows out from the water supply port 42 through the gap between the valve 48 and the valve seat 43 and is stored in the fixed amount water reservoir 22. And
The water level in the fixed amount water reservoir 22 rises, and as shown in FIG.
When the lower surface opening of the tubular portion 41a of the cap 41 is closed by the water surface, the water flow from the water supply port 42 is stopped. At this time, a fixed amount of water is stored in the fixed amount water reservoir 22.

When a fixed amount of water is stored in the fixed amount water reservoir 22 as described above, the operating shaft 36 is thereafter lowered from the upper limit position to the lower limit position. As the operation shaft 36 is lowered from the upper limit position, first, the valve 48 on the tank 39 side comes into contact with the peripheral portion of the water supply port 42 to close the water supply port 42. The closed state is maintained by the body 27. Then, when the operation shaft 36 is lowered to the lower limit position, the upper valve rod 28 is separated from the valve shaft 47, the valve body 27 is separated downward from the bottom of the fixed quantity water reservoir 22, and the water outlet 23 is opened. become. Then, the water stored in the fixed amount water reservoir 22 is discharged from the water outlet 23.
Out into the water receiver 20 and due to the head drop the outlet 2
It is supplied from 1 and stored in the ice tray 13 below.

The water stored in the ice tray 13 is stored in the ice making chamber 1
It is cooled by the cold air supplied into the inside of the container 2 to become ice. When an ice making completion temperature is detected by a temperature sensor (not shown) provided in the ice tray 13, the ice tray 13 is inverted and twisted so that the ice in the ice tray 13 falls into the ice storage container 16. Stored and then ice tray 1
When 3 is returned to the original horizontal state, the water supply operation as described above is performed.

According to the first embodiment described above, the tank 39
Since the valve seat 43 of the valve 4 is inclined with respect to the horizontal plane,
The membrane A formed between the valve 48 and the valve seat 43 when the valve 8 is opened has an asymmetric shape between the lower side and the upper side of the valve seat 43, and the lower side of the valve seat 43 is higher than the upper side. Since it is lower, it is deeper, and the pressure of the water on the membrane A is larger on the lower side of the valve seat 43 than on the upper side, and moreover, the cross-section coefficient of the membrane A is the valve seat 43. The film A formed on the lower side is smaller than the film A formed on the upper side. Therefore, the film A formed on the lower side of the valve seat 43 is more easily torn than the film A formed on the upper side, the balance of the film A as a whole is lost, and the film A is easily torn from the lower side. Therefore, the water can easily flow out from the water supply port 42 without increasing the movement stroke of the valve 48.

Therefore, the valve device according to the first embodiment of the present invention,
FIG. 6 shows the result of a water supply experiment using a valve device having a conventional structure. This FIG. 6 is a measurement of the movement stroke of the valve when the membrane A is broken when the valve is opened. As is apparent from FIG. 6, according to the first embodiment of the present invention, it is possible to supply water even if the average value is 1.66 mm shorter than the conventional value. Therefore, the moving stroke of the valve 48 can be reduced, and the valve device can be made compact.

7 to 9 show a second embodiment of the present invention. This second embodiment is different from the above-mentioned first embodiment in the following points. That is, the valve seat 56 in which the water supply port 55 is formed is formed in a horizontal state. In addition, on the lower surface of the valve 57 that opens and closes the water supply port 55, it is located inside the water supply port 55 in the closed state of the valve 57, and has a protruding shape as a protrusion on the outer peripheral portion eccentric from the center of the water supply port 55. Ribs 58 that form In this case, the rib 58 is formed in an arc shape centered on the center of the valve 57 and is formed in an angular region of about 120 degrees (shown by an angle θ in FIG. 8).

In the above structure, the valve 57 is moved upward from the state where the water supply port 55 is closed, and the valve 5 is opened.
When 7 is separated from the valve seat 56 upward, first, in FIG.
As shown in, a film A is formed between the lower surface of the valve 57 and the upper surface of the valve seat 56 by the surface tension of water. This membrane A attempts to form the smallest radius circle between the valve 57 and the valve seat 56.

When the valve 57 is further pushed up, as shown in FIG. 9C, the size of the gap between the valve 57 and the valve seat 56 on the side where the rib 58 is present and the side where the rib 58 is not present. The things are changing. That is, as the valve 57 rises,
On the side with the rib 58, the outer surface of the rib 58 and the valve seat 56
Since the gap between the outer surface of the valve 57 and the valve seat 56 is smaller than the gap between the outer surface of the valve 57 and the valve seat 56, the membrane A is formed between the outer surface of the rib 58 and the valve seat 56 on the side where the rib 58 is located. Will be formed. Therefore, the membrane A is formed between the outer surface of the valve 57 and the valve seat 56 on the side without the rib 58, but is formed between the outer surface of the rib 58 and the valve seat 56 on the side with the rib 58. As a result, the balance of the film A as a whole is lost, and the film A is easily broken from weak places.

The results of a water supply experiment using the valve device of the second embodiment are also shown in FIG. This Figure 6
As is apparent from the above, according to the second embodiment of the present invention,
It can be seen that water can be supplied even if the average value is shorter than the conventional value by about 0.43 mm.

10 to 12 show a third embodiment of the present invention. This third embodiment differs from the above-mentioned second embodiment in the following points. That is, in the lower portion of the valve 59, the protrusion 60 is provided on the inner side of the water supply port 55 in the closed state of the valve 59, and on the outer peripheral portion eccentric from the center of the water supply port 55. In this case, the outer surface 60a of the protrusion 60 is configured to have a slope inclined downward toward the center of the water supply port 55. This protrusion 60 is also
Like the rib 58, the rib 58 is formed in an angular region of about 120 degrees. Further, in the valve 59, the lower surface 59a other than the protrusion 60
The part is formed flat.

In the above structure, the valve 59 is moved upward from the state in which the water supply port 55 is closed, and the valve 5 is opened.
When 9 separates upward from the valve seat 56, first, as shown in FIG. 12B, a film A is formed between the lower surface of the valve 57 and the upper surface of the valve seat 56 by the surface tension of water. In this case, the shape of the film A varies depending on the side of the valve 59 where the protrusion 60 is present and the side where the protrusion 60 is not present. That is, as the valve 59 moves up, the film A is formed between the outer surface 60a of the protrusion 60 and the valve seat 56 on the side where the protrusion 60 is present (on the right side in FIG. 12). As the film rises, the film A becomes
It moves relatively to the lower side of the protrusion 60 along the outer surface 60a of 0. On the other hand, on the side without the protrusion 60,
The film A formed between the outer surface of the valve 59 and the valve seat 56 becomes larger as the gap becomes larger.

Therefore, in the valve 59, the shape of the membrane A is largely different between the side where the protrusion 60 is present and the side where the protrusion 60 is not present, and the balance of the membrane A as a whole is lost, and the membrane A is easily broken from weak places.

The results of a water supply experiment using the valve device of the third embodiment are also shown in FIG. This Figure 6
As is apparent from the above, according to the third embodiment of the present invention,
It can be seen that water can be supplied even if the average value is shorter than the conventional value by about 0.07 mm. In this case, although the average value of the moving stroke when the film A is broken is not so different from the conventional one, it is understood that the standard deviation σ is smaller than that of the conventional and other examples.
If the standard deviation σ is small, it can be said that there is no unevenness in the movement stroke when the film A is broken. It is considered that this is because the difference between the slope of the outer surface 60a of the projection 60 that transmits the film A and the portion without the projection 60 is reliably exhibited, and the asymmetric film A is reliably formed.

The present invention is not limited to the above-described embodiments, but can be modified or expanded as follows. For example, in each of the above-described embodiments, the valve drive device 3
The vertical movement of the operation shaft 36 of the valve 4 causes the valve 4 to pass through the valve rod 26.
Although 8, 57 and 59 are configured to move up and down, as the tank is set on the mounting table, the lower end of the valve shaft on the tank side is relatively moved by the pressing portion fixedly provided on the mounting table side. The valve may be pushed up by being pressed by.

Further, the present invention is not limited to the valve device of the tank 39 for water supply in the automatic ice making device. For example, in a spray humidifier, a valve device of a tank for supplying water to be sprayed and a petroleum fan. It can also be applied to a valve device of a tank for supplying kerosene to be burned in a heater.

[0041]

According to the valve device of the first aspect, the valve seat formed with the liquid supply port is inclined with respect to the horizontal plane, so that the valve is opened between the valve and the valve seat when the valve is opened. The formed film of liquid becomes asymmetrical between the lower side and the upper side of the valve seat and the balance is lost, and it easily breaks from the weak side on the lower side where a large amount of water pressure is applied, so without increasing the movement stroke of the valve, The liquid can easily flow out from the liquid supply port.

According to the second aspect of the present invention, the valve device is located at the lower portion of the valve, is located inside the liquid supply port in the closed state of the valve, and protrudes from the central portion of the liquid supply port. Due to the provision of the valve, the liquid film formed between the valve and the valve seat when the valve is opened becomes asymmetric between the side with the protrusion and the side without the protrusion, and the balance is lost and the film breaks from a weak point. Since it becomes easier, the liquid can easily flow out from the liquid supply port without increasing the moving stroke of the valve.

In this case, when the protrusion of the valve is formed of a hanging rib, it is possible to easily form an unbalanced film. Further, when the projection has a structure in which the outer surface has a slope inclined downward toward the center of the liquid supply port, the film formed on the side where the projection is formed is surely formed along the slope. As a result, it becomes possible to stably form an unbalanced film.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a first embodiment of the present invention.

FIG. 2 is an explanatory view of the action when the valve opens.

FIG. 3 is a vertical sectional side view showing an automatic ice making device portion of a refrigerator.

FIG. 4 is a vertical cross-sectional view of the main part when the water supply port is closed.

FIG. 5 is a view corresponding to FIG. 4 with the water supply port opened.

FIG. 6 is a diagram showing experimental results of a water supply experiment in a conventional example and each example of the present invention.

FIG. 7 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 8 is a perspective view from below of the valve.

FIG. 9 is a view corresponding to FIG.

FIG. 10 is a view corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 11 is a view corresponding to FIG.

FIG. 12 is a view corresponding to FIG.

FIG. 13 is a diagram corresponding to FIG. 1 showing a conventional configuration.

FIG. 14 is a view corresponding to FIG.

[Explanation of symbols]

39 is a tank, 42 is a water supply port (liquid supply port), 43 is a valve seat,
44 is a valve body, 47 is a valve shaft, 48 is a valve, 55 is a water supply port (liquid supply port), 56 is a valve seat, 57 is a valve, 58 is a rib (projection),
Reference numeral 59 is a valve, 60 is a protrusion, 60a is an outer surface, and A is a membrane.

Claims (4)

[Claims] 1. A valve seat provided at a lower portion of a tank for storing a liquid and having a liquid supply port formed therein, and a valve seat movably in a vertical direction with respect to the valve seat, the peripheral part of the liquid supply port being provided. A valve device having a valve that closes the liquid supply port by contacting from above and opens the liquid supply port by separating from the peripheral edge of the liquid supply port upward, wherein the valve seat is inclined with respect to a horizontal plane. A valve device characterized by being made. 2. A valve seat provided at a lower portion of a tank for storing a liquid and having a liquid supply port formed therein, and provided so as to be vertically movable with respect to the valve seat, at a peripheral portion of the liquid supply port. A valve device having a valve that closes the liquid supply port by contacting from above and opens the liquid supply port by separating from the peripheral edge of the liquid supply port upward, A valve device characterized in that a protrusion is provided at a portion located inside the liquid supply port in a closed state of the valve and eccentric from the center of the liquid supply port. 3. The valve device according to claim 2, wherein the protrusion is formed by a rib having a drooping shape. 4. The valve device according to claim 2, wherein the protrusion has an outer surface having a slope inclined downward toward the center of the liquid supply port.