Ice making system

Abstract

The utility model relates to ice making technical field provides an ice making system. The ice making system includes the compressor, condenser, expansion valve and evaporimeter that set gradually and link into circulation loop, the evaporimeter with the compressor is through first delivery pipe intercommunication, first delivery pipe has gas -liquid separation tank in series, the gas -liquid separation tank divides first delivery pipe into the first pipe section of to the evaporimeter and the second pipe section to the compressor, the gas -liquid separation tank has gas storage cavity, the gas storage cavity is through the second pipe section with the suction port intercommunication of compressor, the ice making system still includes gas pipe, and the both ends of gas pipe are communicated with the compressor and the chamber of evaporimeter respectively, the second pipe section is equipped with first valve body, and gas pipe is equipped with second valve body. The utility model ice making system can block liquid refrigerant outside the compressor in the ice making and ice removing two stages, avoid the compressor to suffer " liquid knock ".

Description

Technical Field

[0001] This utility model relates to the field of ice-making technology, and in particular to an ice-making system. Background Technology

[0002] The refrigeration system of an ice maker mainly includes a compressor, condenser, expansion valve, and evaporator. During ice making, the low-temperature, low-pressure gaseous refrigerant is transformed into a high-temperature, high-pressure gaseous refrigerant by the compressor, and then into a medium-temperature, high-pressure gas-liquid mixture by the condenser. Afterward, it flows into the evaporator as a low-temperature, low-pressure gas-liquid mixture, absorbing heat from the surrounding environment and turning into gaseous refrigerant, thus lowering the temperature around the evaporator and producing ice. The gaseous refrigerant then flows back into the compressor for recirculation. However, if the refrigerant in the evaporator is not completely vaporized, liquid refrigerant flowing into the compressor can cause "liquid slugging," damaging the compressor.

[0003] During de-icing, the high-temperature, high-pressure gaseous refrigerant from the compressor is typically reversed and sent to the evaporator to heat it, causing the formed ice to gradually melt and fall off, thus achieving the purpose of de-icing. During this process, the high-temperature, high-pressure gaseous refrigerant liquefies inside the evaporator upon cooling, forming liquid refrigerant. When de-icing is complete and the system switches back to ice making, this liquid refrigerant rushes back to the compressor with the return gas, creating a risk of liquid slugging again. Utility Model Content

[0004] This invention proposes an ice-making system designed to prevent liquid refrigerant from entering the compressor during the ice-making or de-icing process, thereby ensuring the normal operation of the compressor.

[0005] The ice-making system provided by this utility model includes a compressor, a condenser, an expansion valve, and an evaporator arranged sequentially and connected in a circulation loop. The evaporator and the compressor are connected through a first delivery pipe. A gas-liquid separator is connected in series in the first delivery pipe. The gas-liquid separator divides the first delivery pipe into a first pipe section facing the evaporator and a second pipe section facing the compressor. The gas-liquid separator has a gas storage chamber, which is connected to the suction port of the compressor through the second pipe section. The ice-making system also includes a gas supply pipe, the two ends of which are connected to the chambers of the compressor and the evaporator, respectively. The second pipe section is provided with a first valve body, and the gas supply pipe is provided with a second valve body.

[0006] In one embodiment, the second pipe section is connected to a heat exchanger.

[0007] In one embodiment, the heat exchanger includes a heat exchange tube that is spirally wound around the second tube segment.

[0008] In one embodiment, the length of the second pipe segment is greater than the length of the first pipe segment.

[0009] In one embodiment, the gas-liquid separator further includes a water storage chamber isolated from the gas storage chamber. The expansion valve is connected to the evaporator via a fourth delivery pipe. The gas-liquid separator is connected to a return water pipe that communicates with the water storage chamber. The end of the return water pipe furthest from the water storage chamber is connected to the fourth delivery pipe.

[0010] In one embodiment, the condenser and the expansion valve are connected via a third delivery pipe. The return water pipe includes a first return water section, a second return water section, and a third return water section connected in sequence. The first return water section is connected to the water storage chamber, the third return water section is connected to the fourth delivery pipe, and the second return water section is fitted into the third delivery pipe.

[0011] In one embodiment, the second return water section is spirally wound around the third delivery pipe.

[0012] In one embodiment, the intersection of the second return water section and the first return water section is located below the intersection of the second return water section and the third return water section.

[0013] In one embodiment, the gas-liquid separator has a drain port communicating with the water storage chamber, the first return water section is communicating with the drain port, and the height of the drain port is higher than the height of the intersection of the second return water section and the first return water section.

[0014] In one embodiment, the third delivery pipe is connected in series with a storage tank, and the third return water section includes a main line communicating with the second return water section and a first branch and a second branch branching from the main line. The first branch is connected to the fourth delivery pipe, and the second branch is connected to the storage tank. The first branch is provided with a third valve body, and the second branch is provided with a fourth valve body. The third valve body is used to open during ice making, and the fourth valve body is used to open during ice removal.

[0015] This novel ice-making system features a gas-liquid separator connected in series with a first delivery pipe between the evaporator and compressor. This separator separates the mixed gaseous and liquid phases. An additional gas delivery pipe connects the compressor and evaporator, with its two ends communicating with the chambers of the compressor and evaporator, respectively. The first delivery pipe has a first valve body, and the gas delivery pipe has a second valve body. The first valve body is located between the compressor and the gas-liquid separator, i.e., connected to the second pipe section. During ice making, the first valve body opens, and the second valve body closes. The refrigerant absorbs heat inside the evaporator and then enters the gas-liquid separator through the first pipe section. The gas-liquid separator intercepts any liquid droplets that may remain in the refrigerant, allowing only the gaseous phase to enter the compressor chamber through the second pipe section. During de-icing, both the first and second valve bodies open simultaneously. The high-temperature gaseous refrigerant, compressed by the compressor, is then transported in the reverse direction through the gas delivery pipe to the evaporator, heating it and causing the formed ice blocks to detach. The liquid refrigerant formed by liquefaction inside the evaporator is re-entering the gas-liquid separator through the first pipe section under the action of airflow. The gas-liquid separator intercepts any remaining liquid refrigerant after de-icing, allowing only gaseous refrigerant to enter the compressor chamber through the second pipe section. Clearly, this ice-making system can prevent liquid refrigerant from entering the compressor during both the ice-making and de-icing stages, thus avoiding "liquid slugging" of the compressor. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an embodiment of the ice-making system provided by this utility model; Figure 2 This is a flow diagram of the ice-making system according to an embodiment of the present invention during ice making; Figure 3 This is a flow diagram of the ice-making system provided by this utility model during the de-icing process.

[0018] Explanation of reference numerals in the attached figures: 1. Compressor; 2. Condenser; 3. Expansion valve; 4. Evaporator; 5. Gas-liquid separator; 51. Gas storage chamber; 52. Water storage chamber; 6. Liquid storage tank; 7. First delivery pipe; 71. First pipe section; 72. Second pipe section; 73. Heat exchanger; 8. Second delivery pipe; 9. Third delivery pipe; 10. Fourth delivery pipe; 11. Gas delivery pipe; 12. Return water pipe; 121. First return water section; 122. Second return water section; 123. Third return water section; 1231. Main line; 1232. First branch line; 1233. Second branch line; 13. First valve body; 14. Second valve body; 15. Third valve body; 16. Fourth valve body; 17. Fifth valve body. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] It should be noted that the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to direct setup or connection, or indirect setup or connection through centered components or centered structures.

[0021] Furthermore, in embodiments of this utility model, terms such as "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, or in a conventional placement or usage state. These terms are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the structure, feature, device, or element referred to must have a specific orientation or positional relationship, nor that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0022] The various specific technical features and embodiments described in the detailed embodiments can be combined in any suitable manner without contradiction. For example, different implementation methods can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the various specific technical features / embodiments in this utility model will not be described separately.

[0023] To prevent liquid refrigerant from entering the compressor during the ice-making or de-icing process and to ensure the normal operation of the compressor, this utility model proposes an ice-making system.

[0024] like Figures 1 to 3As shown, an embodiment of the ice-making system of this utility model includes a compressor 1, a condenser 2, an expansion valve 3, and an evaporator 4 arranged sequentially and connected in a circulation loop. The evaporator 4 and the compressor 1 are connected through a first delivery pipe 7. A gas-liquid separator 5 is connected in series in the first delivery pipe 7. The gas-liquid separator 5 divides the first delivery pipe 7 into a first pipe section 71 facing the evaporator 4 and a second pipe section 72 facing the compressor 1. The gas-liquid separator 5 has a gas storage chamber 51, which is connected to the suction port of the compressor 1 through the second pipe section 72. The ice-making system also includes a gas delivery pipe 11, the two ends of which are connected to the chambers of the compressor 1 and the evaporator 4, respectively. The second pipe section 72 is provided with a first valve body 13, and the gas delivery pipe 11 is provided with a second valve body 14.

[0025] Specifically, a first delivery pipe 7 connects the evaporator 4 and the compressor 1, a second delivery pipe 8 connects the compressor 1 and the condenser 2, a third delivery pipe 9 connects the condenser 2 and the expansion valve 3, and a fourth delivery pipe 10 connects the expansion valve 3 and the evaporator 4. The four delivery pipes form a loop connecting the compressor 1, the condenser 2, the expansion valve 3, and the evaporator 4.

[0026] During the ice-making process, the low-temperature, low-pressure gaseous refrigerant is transformed into a high-temperature, high-pressure gaseous refrigerant by the compressor 1. This high-temperature, high-pressure gaseous refrigerant then passes through the condenser 2, becoming a medium-temperature, high-pressure gas-liquid mixture. This medium-temperature, high-pressure gas-liquid mixture then passes through the expansion valve 3, transforming into a low-temperature, low-pressure gas-liquid mixture that flows into the evaporator 4. Inside the evaporator 4, it absorbs heat from the surrounding environment and becomes gaseous refrigerant, causing the temperature around the evaporator 4 to drop and thus preparing ice. The gaseous refrigerant then recirculates back into the compressor 1. During this process, some incompletely vaporized liquid refrigerant may remain inside the evaporator 4, potentially flowing into the compressor 1 and causing liquid slugging damage.

[0027] During de-icing, the high-temperature, high-pressure gaseous refrigerant in compressor 1 is reverse-flowed to evaporator 4, heating the evaporator 4 and causing the formed ice to gradually melt and fall off, thus achieving the purpose of de-icing. During this process, the high-temperature, high-pressure gaseous refrigerant liquefies inside evaporator 4 upon cooling, forming liquid refrigerant. When de-icing is complete and the system switches back to ice making, this liquid refrigerant rushes back to compressor 1 with the return gas, again creating a risk of liquid slugging.

[0028] To prevent liquid refrigerant from entering compressor 1 during ice making or de-icing, the ice making system of this invention has a gas-liquid separator 5 connected in series with the first delivery pipe 7 between evaporator 4 and compressor 1. This gas-liquid separator 5 separates the mixed gaseous and liquid phases. The gas-liquid separator 5 divides the first delivery pipe 7 into a first pipe section 71 facing evaporator 4 and a second pipe section 72 facing compressor 1. The gas-liquid separator 5 has a feed inlet, which is connected to the discharge port of evaporator 4 through the first pipe section 71. Inside the gas-liquid separator 5, there is a gas-liquid separator and a gas storage chamber 51 and a water storage chamber 52 separated by the gas-liquid separator. The gas outlet of the gas storage chamber 51 is connected to the suction port of compressor 1 through the second pipe section 72. An additional gas supply pipe 11 is provided between the compressor 1 and the evaporator 4. The two ends of the gas supply pipe 11 are connected to the chambers of the compressor 1 and the evaporator 4, respectively. The first delivery pipe 7 is provided with a first valve body 13, and the gas supply pipe 11 is provided with a second valve body 14. The first valve body 13 is located between the compressor 1 and the gas-liquid separator 5, that is, the first valve body 13 is connected to the second pipe section 72.

[0029] Figure 2 The flow path diagram of this ice-making system during ice making is shown. Figure 3 The flow path diagram for de-icing in this ice-making system is shown. During ice making, the first valve 13 is open and the second valve 14 is closed. After absorbing heat inside the evaporator 4, the refrigerant enters the gas-liquid separator 5 through the first pipe section 71. The gas-liquid separator 5 intercepts any liquid droplets that may remain in the refrigerant, allowing only the gas phase to enter the compressor 1 chamber through the second pipe section 72. During de-icing, the first valve 13 and the second valve 14 open simultaneously. The high-temperature gaseous refrigerant, compressed by the compressor 1, is transported in reverse through the gas delivery pipe 11 to the evaporator 4, heating the evaporator 4 and causing the formed ice blocks to fall off. The liquid refrigerant formed inside the evaporator 4, under the action of airflow, re-enters the gas-liquid separator 5 through the first pipe section 71. The gas-liquid separator 5 intercepts any liquid refrigerant that may remain in the de-iced refrigerant, allowing only the gaseous refrigerant to enter the compressor 1 chamber through the second pipe section 72.

[0030] In summary, the ice-making system of this utility model has a gas-liquid separator 5 connected in series in the first delivery pipe 7 between the evaporator 4 and the compressor 1 to separate the mixed gas and liquid phases. In addition, a gas delivery pipe 11 is provided between the compressor 1 and the evaporator 4. The two ends of the gas delivery pipe 11 are respectively connected to the chambers of the compressor 1 and the evaporator 4. The first delivery pipe 7 is provided with a first valve body 13, and the gas delivery pipe 11 is provided with a second valve body 14. The first valve body 13 is located between the compressor 1 and the gas-liquid separator 5, that is, the first valve body 13 is connected to the second pipe section 72. This system can block the liquid refrigerant from the compressor 1 in both the ice-making and de-icing stages, thus preventing the compressor 1 from suffering from "liquid slugging".

[0031] Both the first valve body 13 and the second valve body 14 are one-way valves, and their flow directions are opposite: the first valve body 13 flows from the evaporator 4 to the compressor 1, while the second valve body 14 flows from the compressor 1 to the evaporator 4. This prevents the high-temperature, high-pressure gas in the compressor 1 from entering the gas-liquid separator 5 through the second pipe section 72 under pressure during the de-icing stage.

[0032] Furthermore, the second pipe section 72 may be connected to a heat exchanger 73. The heat exchanger 73 may be, but is not limited to, an electric heating rod, a semiconductor cooling device, etc. The heating end of the heat exchanger 73 is thermally connected to the pipe wall of the second pipe section 72 to release heat to the second pipe section 72, evaporate any droplets that may be present in the second pipe section 72, and further eliminate the possibility of droplets being present in the second pipe section 72.

[0033] In practical applications, the heat exchanger 73 can be a heat exchange tube, which is spirally wound around the second pipe section 72. That is, the heat exchanger 73 can have a tubular structure, spirally wound around the second pipe section 72. This arrangement allows for a larger heat exchange area within a limited space, improving droplet evaporation efficiency. Alternatively, the heat exchanger 73 can also be a sleeve fitted over the second pipe section 72, with the inner wall of the sleeve and the outer wall of the second pipe section 72 forming an annular channel for the flow of the heating fluid, which can also release heat to the second pipe section 72.

[0034] The length of the second pipe section 72 can be greater than the length of the first pipe section 71, thereby extending the heat exchange path of the second pipe section 72, so that the residual liquid refrigerant is fully evaporated and overheated before reaching the compressor 1, further reducing the risk of liquid slugging.

[0035] To discharge the liquid refrigerant separated from the gas-liquid separator 5 and prevent it from remaining in the water storage chamber 52 within the separator 5, which would gradually reduce the amount of refrigerant circulating in the entire ice-making system, the gas-liquid separator 5 is connected to a return water pipe 12 that communicates with the water storage chamber 52. The end of the return water pipe 12 furthest from the water storage chamber 52 is connected to the fourth delivery pipe 10. The return water pipe 12 is used to transport the liquid refrigerant separated from the gas-liquid separator 5 to the pipeline between the expansion valve 3 and the evaporator 4, meaning this portion of the liquid refrigerant is re-introduced into the evaporator 4 for evaporation, ensuring that all the refrigerant passing through the evaporator 4 is converted into a gaseous state before entering the compressor 1.

[0036] The condenser 2 and the expansion valve 3 are connected through the third delivery pipe 9. The return water pipe 12 may include a first return water section 121, a second return water section 122 and a third return water section 123 connected in sequence. The first return water section 121 is connected to the water storage chamber 52, the third return water section 123 is connected to the fourth delivery pipe 10, and the second return water section 122 is fitted to the third delivery pipe 9.

[0037] Normally, the temperature of the refrigerant flowing out of the evaporator 4 is relatively low, around 10°C, while the temperature of the refrigerant flowing out of the condenser 2 is usually higher, around 35°C. In this embodiment, a section of the return water pipe 12 is connected to the third delivery pipe 9 and then converges into the fourth delivery pipe 10. This allows the low-temperature refrigerant separated from the gas-liquid separator 5 to exchange heat with the higher-temperature refrigerant flowing out of the condenser 2. On the one hand, this effectively utilizes the heat from the third delivery pipe 9, and on the other hand, it reduces the heat dissipation burden on the condenser 2.

[0038] In practical applications, the second return water section 122 can be spirally wound around the third delivery pipe 9, thereby achieving a larger heat exchange area within a limited space and improving heat exchange efficiency.

[0039] The intersection of the second return water section 122 and the first return water section 121 can be located below the intersection of the second return water section 122 and the third return water section 123. This design allows the return water in the second return water pipe 12 to enter at a lower level and exit at a higher level, reducing the flow rate of the return water, extending the contact time between the return water and the third delivery tank, and promoting sufficient heat exchange between the return water and the third delivery pipe 9.

[0040] The gas-liquid separator 5 has a drain port connected to the water storage chamber 52. The first return water section 121 is connected to the drain port, and the height of the drain port is higher than the height of the intersection of the second return water section 122 and the first return water section 121. With this design, the liquid refrigerant in the water storage chamber 52 falls naturally under the action of gravity without the need for any pump, and the trapped liquid refrigerant can be quickly guided to the second return water section 122 for heat exchange.

[0041] The third delivery pipe 9 is connected in series with a liquid storage tank 6 for storing refrigerant. The third return water section 123 includes a main line 1231 connected to the second return water section 122, and a first branch line 1232 and a second branch line 1233 branching from the main line 1231. The first branch line 1232 is connected to the fourth delivery pipe 10, and the second branch line 1233 is connected to the liquid storage tank 6. The first branch line 1232 is provided with a third valve body 15, and the second branch line 1233 is provided with a fourth valve body 16. The pipeline between the liquid storage tank 6 and the expansion valve 3 is provided with a fifth valve body 17. The third valve body 15 and the fifth valve body 17 are used to open when making ice, and the fourth valve body 16 is used to open when de-icing.

[0042] In summary, the workflow of this ice-making system is as follows: During ice making, the fifth valve body 17, the first valve body 13, and the third valve body 15 are opened, while the second valve body 14 and the fourth valve body 16 are closed. The refrigerant stored in the liquid receiver 6 (initially, the refrigerant stored in the liquid receiver 6 is usually at room temperature and pressure) enters the expansion valve 3 through the fifth valve body 17. The expansion valve 3 converts the room temperature and pressure refrigerant output from the liquid receiver 6 into a low-temperature, low-pressure gas-liquid mixture. This low-temperature, low-pressure gas-liquid mixture flows into the evaporator 4, where it absorbs heat from the surrounding environment and becomes a medium-temperature refrigerant that may carry a liquid phase. The medium-temperature refrigerant flowing out of the evaporator 4 enters the gas-liquid separator 5 through the first pipe section 71. The liquid separator 5 intercepts any liquid droplets that may remain in the refrigerant, allowing only the gas phase to enter the compressor 1 chamber through the second pipe section 72. The liquid refrigerant intercepted by the gas-liquid separator 5 flows back to the front end of the evaporator 4 after exchanging heat with the third delivery pipe 9 through the return water pipe 12, and is reintroduced into the evaporator 4 for evaporation. After multiple cycles, the refrigerant output from the evaporator 4 can be completely converted into a liquid phase and enter the compressor 1. The compressor 1 compresses the input medium-temperature gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant flows into the liquid storage tank 6 after being cooled by the condenser 2 and the third delivery pipe 9, and this cycle repeats continuously.

[0043] During de-icing, the first valve body 13, the second valve body 14, and the fourth valve body 16 are opened, while the third valve body 15 and the fifth valve body 17 are closed. The high-temperature gaseous refrigerant in the compressor 1 is reverse-transported to the evaporator 4 through the gas delivery pipe 11 to heat the evaporator 4 and cause the formed ice blocks to fall off. The refrigerant in the evaporator 4 enters the gas-liquid separator 5 through the first pipe section 71 under the action of airflow. The gas-liquid separator 5 intercepts the liquefied liquid refrigerant and only allows the gaseous refrigerant to enter the compressor 1 through the second pipe section 72. The compressor 1 compresses the input medium-temperature gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant flows into the liquid storage tank 6 for storage after being cooled by the condenser 2 and the third delivery pipe 9. The liquid refrigerant intercepted by the gas-liquid separator 5 enters the liquid storage tank 6 for storage through the return water pipe 12.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An ice-making system, characterized in that, The device includes a compressor, a condenser, an expansion valve, and an evaporator arranged sequentially and connected in a loop. The evaporator and the compressor are connected through a first delivery pipe. A gas-liquid separator is connected in series with the first delivery pipe. The gas-liquid separator divides the first delivery pipe into a first pipe section facing the evaporator and a second pipe section facing the compressor. The gas-liquid separator has a gas storage chamber, which is connected to the suction port of the compressor through the second pipe section. The ice-making system also includes a gas supply pipe, the two ends of which are connected to the chambers of the compressor and the evaporator, respectively. The second pipe section is provided with a first valve body, and the gas supply pipe is provided with a second valve body.

2. The ice-making system as described in claim 1, characterized in that, The second pipe section is connected to a heat exchanger.

3. The ice-making system as described in claim 2, characterized in that, The heat exchanger includes a heat exchange tube, which is spirally wound around the second tube segment.

4. The ice-making system as described in claim 3, characterized in that, The length of the second pipe segment is greater than the length of the first pipe segment.

5. The ice-making system according to any one of claims 1 to 4, characterized in that, The gas-liquid separator also has a water storage chamber isolated from the gas storage chamber. The expansion valve is connected to the evaporator through a fourth delivery pipe. The gas-liquid separator is connected to a return water pipe that is connected to the water storage chamber. The end of the return water pipe away from the water storage chamber is connected to the fourth delivery pipe.

6. The ice-making system as described in claim 5, characterized in that, The condenser and the expansion valve are connected through a third delivery pipe. The return water pipe includes a first return water section, a second return water section and a third return water section connected in sequence. The first return water section is connected to the water storage chamber, the third return water section is connected to the fourth delivery pipe, and the second return water section is fitted to the third delivery pipe.

7. The ice-making system as described in claim 6, characterized in that, The second return water section is spirally wound around the third delivery pipe.

8. The ice-making system as described in claim 6, characterized in that, The intersection of the second return water section and the first return water section is located below the intersection of the second return water section and the third return water section.

9. The ice-making system as described in claim 6, characterized in that, The gas-liquid separator has a drain port that communicates with the water storage chamber. The first return water section is connected to the drain port, and the height of the drain port is higher than the height of the intersection of the second return water section and the first return water section.

10. The ice-making system as described in claim 6, characterized in that, The third delivery pipe is connected in series with a storage tank. The third return water section includes a main line connected to the second return water section and a first branch and a second branch branching from the main line. The first branch is connected to the fourth delivery pipe, and the second branch is connected to the storage tank. The first branch is provided with a third valve body, and the second branch is provided with a fourth valve body. The third valve body is used to open when making ice, and the fourth valve body is used to open when de-icing.

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