CN103604260A - Refrigerator water supply device and water supply method - Google Patents

Abstract

The present invention relates to the technical field of refrigerators, and more specifically, to a refrigerator water supply device and a water supply method thereof. A water supply device for a refrigerator, comprising a refrigerating door body, a freezing door body, a door shelf arranged on the refrigerating door body, an ice making device arranged on the freezing door body, and a cold water outlet that can receive cold water from the outside; it also includes a water pipe , the water pump, the water valve connected to the water pump, the water tank assembly detachably installed on the door shelf, the water pump and the water valve are located in the press chamber, one end of the water pipe is connected to the water tank assembly, and the other end is connected to the water pump; Ice maker and cold water outlet. The water tank of the present invention has a simple installation structure and is convenient for users to disassemble and clean. Equipped with a filter device to prevent secondary pollution of pure water added by users and provide a safe and hygienic water source. The water tank assembly for water supply is installed on the refrigerator door body. Through the installation of the water outlet of the water tank and the bracket interface, the stability and reliability of the smooth flow of water can be guaranteed, and the assembly and disassembly are more convenient, which is convenient for users to clean.

Description

A kind of refrigerator water supply device and water supply method thereof

technical field

The present invention relates to the technical field of refrigerators, and more specifically, to a refrigerator water supply device and a water supply method thereof.

Background technique

Most of the high-end refrigerators on the market are equipped with functions such as water dispensers and automatic ice makers, and there are outlets for taking ice and cold water on the door panel, so that you can take ice or cold water without opening the refrigerator door. This type of refrigerator generally introduces tap water directly from the tap water pipe to supply water to the automatic ice maker and drinking water device through the water valve, so the water supply is greatly affected by the tap water pressure. The pressure is very high, and there will be a large deviation in the water supply when filling the automatic ice-making device with water at a fixed time; the water quality of the external water source is also a big problem, and the method of adding a filter to the refrigerator cannot reduce the external water source. Water quality has improved a lot.

In order to solve these problems, some refrigerators are equipped with a water tank for its water supply, which is generally installed in the refrigerator body, and the water quality problem can be solved by adding pure water to the user, which will bring the risk of secondary pollution of the water quality, and because not only the The water supply of the ice device also needs to provide the function of taking cold water. The capacity of the water tank must be large, and it will take up more storage space when installed in the box. Using the method of built-in water supply tank, under certain circumstances, such as when there is no water in the water tank, the water pump will pump water, and air will be sucked into the pipeline, resulting in a mixed state of water column and air column in the water pipe; after the user adds water to the water tank, If the water pump continues to pump water, due to the pressure formed by the air column and water column in the water pipe, the water channel in the pipe will be blocked and the water will not flow.

Contents of the invention

The technical problem to be solved by the present invention is to provide a refrigerator water supply device, the water tank of which has a simple installation structure and is convenient for users to disassemble and clean. It is also equipped with a filter device, which can prevent secondary pollution of pure water added by users and provide a safe and hygienic water source. Further, a water supply method is provided, which can prevent the waterway from being blocked by air pressure, and realize the effect of providing stable water supply with accurate water flow to the ice making device and the function of taking cold water.

In order to solve the above technical problems, the technical solution adopted by the present invention is: a refrigerator water supply device, which includes a refrigerator door body, a freezer door body, a door shelf arranged on the refrigerator door body, and a system installed on the freezer door body. Ice device and cold water outlet that can be connected to cold water from the outside;

It also includes a water pipe, a water pump, a water valve connected to the water pump, and a water tank assembly detachably installed on the door shelf. The water pump and the water valve are arranged in the press chamber. The water pipes are respectively connected to the ice making device and the cold water outlet.

In the present invention, the water tank assembly for water supply is installed on the refrigerated door, and the complete installation of the water outlet of the water tank and the bracket interface can ensure the stability and reliability of the smooth waterway, making assembly and disassembly more convenient, and convenient for users to clean; Furthermore, the space on the door is fully utilized, so that the space in the box body can be better utilized and the space utilization rate is improved.

Moreover, under certain circumstances, such as when the water tank assembly for water supply changes from an anhydrous state to a state with water, the timing reverse operation of the water pump can prevent the air pressure in the pipeline from blocking the pumping phenomenon, so that the water pump and water valve can be used stably. The ice making device and the function of taking cold water on the freezing door realize water supply.

Specifically, the water pipes include a first water pipe, a second water pipe, a third water pipe, a fourth water pipe, a fifth water pipe, and a sixth water pipe. Hinge; the first water pipe is foamed in the refrigerator door body, passes through the lower hinge of the refrigerator, and is connected to the second water pipe through a pipe joint; the second water pipe passes through the bottom of the refrigerator and is connected to the water pump;

The water valve is provided with two outlets, respectively connected to the third water pipe and the fourth water pipe, the third water pipe is connected to the fifth water pipe through a pipe joint, the fifth water pipe is connected to the cold water outlet; the fourth water pipe is connected to the sixth water pipe through a pipe joint, The sixth water pipe is connected to the ice making device; the third water pipe and the fourth water pipe pass through the bottom of the refrigerator; the fifth water pipe and the sixth water pipe are foamed in the freezer door body and pass through the lower hinge of the freezer.

A freezing door body and a refrigerating door body are installed in the front of the refrigerator box body, and the door bodies are respectively connected to the front ends of both sides of the box body through hinges, so as to be able to rotate around the hinge shaft. The water in the water tank passes through the pipeline system from the lower hinge of the refrigerating door body, through the water pump and water valve in the press chamber, and then through the lower hinge of the freezing door body, to supply water to the ice making device and the cold water outlet respectively. The water pump provides power for the flow of the waterway. The water flowing out of the water tank assembly enters the water pump through the first water pipe and the second water pipe. The joint is connected to the fifth water pipe, which will flow to the cold water outlet, and a part of the water will pass through the fourth water pipe and connect to the sixth water pipe through the pipe joint, and flow to the ice making device. It can stably supply water to the ice making device and the cold water outlet on the freezer door.

Further, the water tank assembly includes a water supply box detachably installed on the door shelf, a bracket provided on the water supply box, a connecting piece, and a sensing device for sensing whether the water tank is installed in place. One end of the connecting piece is connected to the water supply box. Water outlet, the other end is connected with the first water pipe. The water supply box includes a water tank body at the bottom and a water tank cover sealed with the water tank body. The water tank cover is provided with a water injection port, a knob is provided on the water injection port, and a filter device is provided at the lower part of the water injection port. The filter device is used to filter the water poured into the water tank to provide a safe and hygienic water source to meet the needs of consumers. There are protrusions on the bottom of the water tank body, which can slide on the door shelf with less resistance.

Further, a cooperating guiding and limiting structure is provided between the water tank cover and the bracket. The guide and position-limiting structure includes a tank cover guide rail structure and a tank cover buckle limit structure arranged on the water tank cover, and a bracket guide rail structure arranged on the bracket to cooperate with the tank cover guide rail structure and the tank cover buckle limit structure. And bracket buckle limit structure. The buckle limit structure on the water tank cover and the bracket prevents the water supply tank from falling off lightly after it is installed in place. The bracket has a slide guide structure and a buckle limit structure, which can guide the positioning and installation of the water tank. Moreover, the water tank can slide in the upper door shelf of the refrigerator door, and connect with the silicone connector on the bracket through the horizontal installation direction.

Further, the sensing device includes a reed switch clamped on the bracket, a magnet installed on the water tank cover, and the magnet and the reed switch sense whether the water tank is installed in place. The connecting piece is a silicone connecting piece, and a hole is opened on the side wall of the bracket, the silicone connecting piece is inserted into the hole, and the other end is connected to the first water pipe. The ice making device includes an ice making tray and an ice making temperature sensing head.

In the present invention, one end of the silicone connector has an H-shaped round rib structure, and the side of the bracket has a larger round hole. The hole can be stuck in the middle of the H-shaped round rib structure, which can limit the silicone connector within the range of the round hole gap. Freedom of movement. Or different from the above structure, one end of the silicone connector only has a square rib structure, and the side of the bracket has an H-shaped rib structure, and the rib has a round hole, the square rib of the silicone connector is inserted into the bracket, and the round rib on the rib within the hole range.

A water supply method, using the refrigerator water supply device, comprises the following steps:

S1: The user replenishes the water supply box and installs the water supply box;

S2: The sensing device senses whether the water tank is installed in place, and if it is installed in place, the sensing device provides a signal to the water pump;

S3: The water pump runs in reverse, returning the excess water and air attached to the water pipe to the water supply box;

S4: The water pump runs forward, supplying water to the ice making device and the cold water outlet respectively;

S5: After filling the ice making device with water, the ice-making temperature sensing head senses the temperature in the ice-making compartment. If the temperature sensed by the ice-making temperature sensing head rises, it means that there is water in the water supply box and the water filling is completed. If it rises, it means that there is no water injection, that is, it is judged that there is no water in the water supply box.

Specifically, when the water supply box is dry, the user will remove the water supply box to replenish water, and when the user reinstalls the water supply box, the sensing device will provide a signal change, which can trigger the reverse operation of the water pump at regular intervals. The water pump runs in reverse to return excess water and air attached to the water delivery pipe to the water supply box, which reduces the pressure in the water delivery pipe. When the water pump is pumped in the forward direction, the water can flow normally.

Wherein, whether there is water in the water supply box can be vaguely judged by feeling the temperature change of the ice-making temperature sensing head 81 under the ice-making box after filling the ice-making box with water. The temperature of the freezer where the ice box is located is generally -15-25 degrees, and the room temperature of the refrigerator where the water tank is located is generally 2-8 degrees, so if the temperature of the temperature sensor of the ice box rises significantly, it means that the water supply box If there is water and the water injection is completed, if there is no obvious temperature rise, it means that there is no water injection, that is, it is judged that the water supply box has no water.

Compared with the prior art, the beneficial effect is that the water tank of the present invention has a simple installation structure and is convenient for users to disassemble and clean. It is also equipped with a filter device, which can prevent secondary pollution of pure water added by users and provide a safe and hygienic water source. The water tank assembly for water supply is installed on the refrigeration door body, and the complete installation of the water outlet of the water tank and the bracket interface can ensure the stability and reliability of the smooth flow of water, making assembly and disassembly more convenient for users to clean; and making full use of the The space on the door can make better use of the space in the cabinet and improve the space utilization rate.

Its water supply method, under certain conditions, such as when the water tank changes from anhydrous to a state of water, the water pump is used to perform regular reverse operation to prevent the waterway from being blocked by air pressure; under normal circumstances, the water pump is operated in the forward direction to achieve water supply. Realize the effect of providing stable water supply with accurate water flow to the ice making device and the function of taking cold water.

Description of drawings

Fig. 1 is a schematic layout diagram of the water supply device of the present invention.

Fig. 2 is a schematic diagram of the exploded structure of the water tank assembly of the present invention.

Fig. 3 is a schematic diagram of the assembly structure of the water tank assembly of the present invention.

Fig. 4 is a schematic cross-sectional structure diagram of the water tank assembly of the present invention.

Fig. 5 is a schematic diagram of the installation of the water supply box of the present invention.

Fig. 6 is an enlarged schematic view of the cooperation structure between the bracket and the water tank cover of the present invention.

Fig. 7 is a schematic flow chart of the water supply method of the present invention.

Detailed ways

The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

As shown in Figure 1, a water supply device for a refrigerator includes a refrigerator door body 1, a freezer door body 2, a door shelf 3 arranged on the refrigerator door body 1, and an ice making device 8 arranged on the freezer door body 2 And the cold water outlet 9 that can be connected with cold water from the outside;

It also includes a water pipe 5, a water pump 6, a water valve 7 connected to the water pump 6, a water tank assembly 4 detachably installed on the door shelf 3, the water pump 6 and the water valve 7 are arranged in the press chamber, and one end of the water pipe 5 is connected to the water tank assembly 4. The other end is connected to the water pump 6; the water valve 7 is respectively connected to the ice making device 8 and the cold water outlet 9 through the water pipe 5.

In this embodiment, the water tank assembly 4 for water supply is installed on the refrigerated door body 1, and through the complete installation of the water outlet of the water tank and the bracket interface, the stability and reliability of the smooth waterway can be guaranteed, and the assembly and disassembly are more convenient and convenient. The user is clean; and the space on the door is fully utilized, so that the space in the box can be better utilized and the space utilization rate is improved.

And under certain circumstances, when the water tank assembly 4 of water supply changes from anhydrous to having water state, implement timing reverse operation by water pump 6, can prevent the air pressure in the pipeline from blocking the water pumping phenomenon, can stabilize by water pump and water valve like this The water supply is realized for the ice making device and the function of taking cold water on the freezing door body.

Specifically, the water pipe 5 includes a first water pipe 51, a second water pipe 52, a third water pipe 53, a fourth water pipe 54, a fifth water pipe 55, and a sixth water pipe 56. The lower part of the refrigerator door body 1 is provided with a refrigerator lower hinge 11, and the freezer door The lower part of the body 2 is provided with a refrigerated lower hinge 21; the first water pipe 51 is foamed in the refrigerated door body 1, passes through the refrigerated lower hinge 11, and is connected to the second water pipe 52 through a pipe joint; the second water pipe 52 passes through the bottom of the refrigerator , connected with the water pump 6;

The water valve 7 is provided with two outlets, respectively connected to the third water pipe 53 and the fourth water pipe 54, the third water pipe 53 is connected to the fifth water pipe 55 through a pipe joint, and the fifth water pipe 55 is connected to the cold water outlet 9; the fourth water pipe 54 passes through The pipe joint is connected to the sixth water pipe 56, and the sixth water pipe 56 is connected to the ice making device 8; the third water pipe 53 and the fourth water pipe 54 pass through the bottom of the refrigerator, and the fifth water pipe 55 and the sixth water pipe 56 are foamed in the freezer door body 2 and pass through the lower hinge 21 of the freezer.

A freezing door body 2 and a refrigerating door body 1 are installed in the front of the refrigerator cabinet, and the doors are connected to the front ends of both sides of the cabinet through hinges respectively, so as to be able to rotate around the hinge shaft. The water in the water tank passes through the pipeline system from the lower hinge of the refrigerating door 1, through the water pump 6 and the water valve 7 in the press chamber, and then through the lower hinge of the refrigerating door, to supply water to the ice making device 8 and the cold water outlet 9 respectively. . The water pump 6 provides power for the flow of the waterway. The water flowing out from the water tank assembly 4 enters the water pump 6 through the first water pipe 51 and the second water pipe 52 . The water is connected to the fifth water pipe 55 through the third water pipe 53 through the pipe joint, and will flow to the cold water outlet 9, and a part of the water is connected to the sixth water pipe 56 through the fourth water pipe 54 through the pipe joint, and flows to the ice making device 8. The airtight connection between the water pipes, through the action of the water pump 6 and the water valve 7, can stably supply water to the ice making device and the cold water outlet 9 on the freezing door body.

As shown in Figures 2 and 3, the water tank assembly includes a water supply box detachably installed on the door shelf 3, a bracket 43 on the water supply box, a connecting piece 44, a sensing device for sensing whether the water tank is installed in place, and the connecting piece 44 One end is connected to the water outlet of the water supply box, and the other end is connected to the first water pipe 51 . The water supply box includes a water tank body 41 located at the bottom, a water tank cover 42 sealed with the water tank body 41, the water tank cover 42 is provided with a water injection port, the water injection port is provided with a knob 45, and the water injection port bottom is provided with a filter device 46.

The filtering device 46 is used to filter the water poured into the water tank, so as to provide a safe and hygienic water source and meet the needs of consumers. There is a protrusion at the bottom of the water tank body 41, which can slide on the door shelf 3 with less resistance.

As shown in Figures 2-6, a cooperative guiding and limiting structure is provided between the water tank cover 42 and the bracket 43 . The guiding and limiting structure includes a tank cover guide rail structure 422 and a tank cover buckle limiting structure 421 arranged on the water tank cover 42, and a tank cover guide rail structure 422 and a tank cover buckle limiting structure 421 that are arranged on the bracket 43 cooperate with each other. The bracket guide rail structure 431 and the bracket buckle stop structure 432 .

Through the buckle limit structure on the water tank cover 42 and the support 43, the water supply tank will not fall off lightly after it is installed in place, and the slide guide structure and the buckle limit structure are arranged on the support 43, which can guide the positioning and installation of the water tank. And the water tank can slide in the door shelf 3 on the refrigerator door, and dock with the silicone connector 44 on the support 43 through the horizontal installation direction.

Induction device comprises the dry reed switch 47 that is clamped on the support, the magnet 48 that is installed on the water tank cover, whether magnet 48 and dry reed switch 47 induction water tanks are installed in place. The connector 44 is a silicone connector, and a hole is opened on the side wall of the bracket 43 , the silicone connector 44 is inserted into the hole, and the other end is connected to the first water pipe 51 . The ice making device 8 includes an ice making tray and an ice making temperature sensing head 81 .

In this embodiment, one end of the silicone connector 44 has an H-shaped round rib structure, and the side of the bracket 43 has a larger round hole. The hole can be stuck in the middle of the H-shaped round rib structure, which can limit the silicone connector in its round hole You can move freely within the range of the gap. Or different from the above structure, one end of the silicone connector only has a square rib structure, and the side of the bracket has an H-shaped rib structure, and the rib has a round hole, the square rib of the silicone connector is inserted into the bracket, and the round rib on the rib within the hole range.

As shown in Figure 7, a water supply method, using the refrigerator water supply device, includes the following steps:

S1: The user replenishes the water supply box and installs the water supply box;

S2: The sensing device senses whether the water tank is installed in place, and if it is installed in place, the sensing device provides a signal to the water pump;

S3: The water pump runs in reverse, returning the excess water and air attached to the water pipe to the water supply box;

S4: The water pump runs forward, supplying water to the ice making device and the cold water outlet respectively;

S5: After filling the ice making device with water, the ice-making temperature sensing head senses the temperature in the ice-making compartment. If the temperature sensed by the ice-making temperature sensing head rises, it means that there is water in the water supply box and the water filling is completed. If it rises, it means that there is no water injection, that is, it is judged that there is no water in the water supply box.

Specifically, when the water supply box is dry, the user will remove the water supply box to replenish water, and when the user reinstalls the water supply box, the sensing device will provide a signal change, which can trigger the reverse operation of the water pump at regular intervals. The water pump runs in reverse to return excess water and air attached to the water delivery pipe to the water supply box, which reduces the pressure in the water delivery pipe. When the water pump is pumped in the forward direction, the water can flow normally.

Wherein, whether there is water in the water supply box can be vaguely judged by feeling the temperature change of the ice-making temperature sensing head 81 under the ice-making box after filling the ice-making box with water. The temperature of the freezer where the ice box is located is generally -15-25 degrees, and the room temperature of the refrigerator where the water tank is located is generally 2-8 degrees, so if the temperature of the temperature sensor of the ice box rises significantly, it means that the water supply box If there is water and the water injection is completed, if there is no obvious temperature rise, it means that there is no water injection, that is, it is judged that the water supply box has no water.

The installation structure of the water tank in this embodiment is simple and convenient for users to disassemble and clean. It is also equipped with a filter device, which can prevent secondary pollution of pure water added by users and provide a safe and hygienic water source. The water tank assembly for water supply is installed on the refrigeration door body, and the complete installation of the water outlet of the water tank and the bracket interface can ensure the stability and reliability of the smooth flow of water, making assembly and disassembly more convenient for users to clean; and making full use of the The space on the door can make better use of the space in the cabinet and improve the space utilization rate.

Its water supply method, under certain conditions, such as when the water tank changes from anhydrous to a state of water, the water pump is used to perform regular reverse operation to prevent the waterway from being blocked by air pressure; under normal circumstances, the water pump is operated in the forward direction to achieve water supply. Realize the effect of providing stable water supply with accurate water flow to the ice making device and the function of taking cold water.

The same or similar symbols correspond to the same or similar components; the positional relationship described in the drawings is only for illustrative purposes, and should not be construed as a limitation on this patent.

The above description is only the preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements suitable for the actual situation can be made to the technical solution of the invention. Therefore, the protection scope of the present invention is not limited thereto, and any insubstantial changes based on the technical solution of the present invention are included in the protection scope of the present invention.

Claims (10)

1. A refrigerator water supply device, characterized in that it includes a refrigerator door (1), a freezer door (2), a door shelf (3) on the refrigerator door (1), a refrigerator door ( 2) The ice making device (8) on the top and the cold water outlet (9) that can be connected to cold water from the outside; It also includes a water pipe (5), a water pump (6), a water valve (7) connected to the water pump (6), a water tank assembly (4) detachably installed on the door shelf (3), a water pump (6) and a water valve (7) Located in the press chamber, one end of the water pipe (5) is connected to the water tank assembly (4), and the other end is connected to the water pump (6); the water valve (7) is respectively connected to the ice making device (8) and cold water through the water pipe (5) Take out the outlet (9). 2. A refrigerator water supply device according to claim 1, characterized in that the water pipe (5) includes a first water pipe (51), a second water pipe (52), a third water pipe (53), a fourth The water pipe (54), the fifth water pipe (55), the sixth water pipe (56), the lower part of the refrigerated door body (1) is provided with a refrigerated lower hinge (11), and the lower part of the refrigerated door body (2) is provided with a frozen lower hinge (21) ; The first water pipe (51) is foamed in the refrigerator door (1), passes through the lower hinge (11) of the refrigerator, and is connected to the second water pipe (52) through a pipe joint; the second water pipe (52) passes through the refrigerator Bottom, connected with water pump (6); The water valve (7) is provided with two outlets, respectively connected to the third water pipe (53) and the fourth water pipe (54), the third water pipe (53) is connected to the fifth water pipe (55) through a pipe joint, and the fifth water pipe (55 ) is connected to the cold water outlet (9); the fourth water pipe (54) is connected to the sixth water pipe (56) through a pipe joint, and the sixth water pipe (56) is connected to the ice making device (8); the third water pipe (53) and the fourth The water pipe (54) passes through the bottom of the refrigerator, and the fifth water pipe (55) and the sixth water pipe (56) are foamed in the freezing door body (2) and pass through the freezing lower hinge (21). 3. A refrigerator water supply device according to claim 2, characterized in that the water tank assembly (4) includes a water supply box fixedly installed on the door shelf (3), a bracket ( 43), a connecting piece (44), a sensing device for sensing whether the water tank is installed in place, one end of the connecting piece (44) is connected to the water outlet of the water supply box, and the other end is connected to the first water pipe (51). 4. A refrigerator water supply device according to claim 3, characterized in that the water supply box includes a water tank body (41) at the bottom, and a water tank cover (42) sealingly assembled with the water tank body (41), The water tank cover (42) has a water injection port, the water injection port is provided with a knob (45), and the water injection port bottom is provided with a filtering device (46). 5. A refrigerator water supply device according to claim 4, characterized in that a cooperating guiding and limiting structure is provided between the water tank cover (42) and the bracket (43). 6. A refrigerator water supply device according to claim 5, characterized in that, the guide and limit structure includes a cover guide rail structure (422) provided on the water tank cover (42) and a box cover buckle limit Structure (421), the bracket guide rail structure (431) and the bracket buckle limit structure (432) that are arranged on the bracket (43) and the box cover guide rail structure (422), the box cover buckle limit structure (421) . 7. A refrigerator water supply device according to claim 4, characterized in that the induction device includes a reed switch (47) clamped on the bracket (43), a reed switch installed on the water tank cover (42) magnet (48). 8. A refrigerator water supply device according to claim 4, characterized in that, the connector (44) is a silicone connector, a hole is opened on the side wall of the bracket (43), and the silicone connector is inserted into the hole, The other end is connected to the first water pipe (51). 9. A refrigerator water supply device according to any one of claims 1 to 8, characterized in that the ice making device (8) includes an ice making tray and an ice making temperature sensing head (81). 10. A water supply method, characterized in that the refrigerator water supply device according to claim 9 is applied, comprising the following steps: S1: The user replenishes the water supply box and installs the water supply box; S2: The sensing device senses whether the water tank is installed in place, and if it is installed in place, the sensing device provides a signal to the water pump; S3: The water pump runs in reverse, returning the excess water and air attached to the water pipe to the water supply box; S4: The water pump runs forward, supplying water to the ice making device and the cold water outlet respectively; S5: After filling the ice making device with water, the ice-making temperature sensing head senses the temperature in the ice-making compartment. If the temperature sensed by the ice-making temperature sensing head rises, it means that there is water in the water supply box and the water filling is completed. If it rises, it means that there is no water injection, that is, it is judged that there is no water in the water supply box.

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