Cold water supply unit

Abstract

This utility model belongs to the field of energy-saving heat exchange technology and discloses a cold water supply device, including a first heat exchanger, a second heat exchanger, a return water container, and a supply water container. The first heat exchanger has a first fluid channel and a second fluid channel; the second heat exchanger has a refrigerant heat exchange channel that can exchange heat with the ambient cold air to lower its temperature; the refrigerant heat exchange channel is connected to the first fluid channel to form a refrigeration circuit; the return water container is connected to the second fluid channel to form a water temperature regulation circuit; the supply water container has an inlet and an outlet, the inlet selectively connected to the cold water outlet of the second fluid channel; the outlet of the supply water container is connected to a cold water consumption point to provide cold water. This utility model can save a large amount of electrical energy, improve the stability of cold water temperature, and solve the problem of freezing of the first heat exchanger due to excessively low refrigerant temperature.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving heat exchange technology, and in particular to a cold water supply device. Background Technology

[0002] In milk processing, milk that has undergone high-temperature sterilization needs to be cooled promptly. In existing technology, a water pump draws low-temperature coolant from a tank. The coolant flows out of the pump and is transported through a vertical pipe to a cooling jacket, filling it completely. This coolant cools the milk in the discharge pipe. After cooling, the cooled coolant is returned to a cooler via a return pipe for further cooling. Finally, the cooled coolant is returned to the tank via a connecting pipe, thus achieving a cooling cycle. The problems are: using a cooler to cool the coolant consumes a significant amount of electricity, increasing production costs; in practical applications, the temperature of the low-temperature coolant is difficult to control, and the cooler itself is prone to heat exchanger freezing, resulting in insufficient stability of the chilled water supply and failing to achieve the expected energy-saving effect. Utility Model Content

[0003] The purpose of this invention is to provide a cold water supply device that solves the problems of high energy consumption, poor temperature stability, and easy freezing of the first heat exchanger in cold water supply methods.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] Cold water supply unit, including:

[0006] A first heat exchanger having a first fluid channel and a second fluid channel therein;

[0007] The second heat exchanger has a refrigerant heat exchange channel that can exchange heat with the ambient cold air to lower its temperature; the refrigerant heat exchange channel contains refrigerant and is connected to the first fluid channel to form a refrigeration circuit.

[0008] A water return container has a water return outlet and a water return inlet. The water return outlet is connected to the cold water inlet of the second fluid channel, and the water return inlet is connected to the cold water outlet of the second fluid channel to form a water temperature regulation loop.

[0009] A water supply container having an inlet and an outlet, the inlet being selectively connected to the cold water outlet of the second fluid channel; the outlet of the water supply container being connected to a cold water consumption point to provide cold water.

[0010] In some embodiments, the cold water supply device further includes:

[0011] A return water pipe, the two ends of which are respectively connected to the cold water outlet and the return water inlet, and a first valve is provided on the return water pipe;

[0012] The water inlet pipe has one end connected to the return water pipe between the cold water outlet and the first valve, and the other end connected to the water inlet. A second valve is provided on the water inlet pipe. The first valve and the second valve can be alternately opened so that the cold water outlet alternately opens the return water inlet and the water inlet.

[0013] In some embodiments, a first temperature sensor is provided on the return water pipe. The first temperature sensor is used to detect the cold water temperature at the cold water outlet. When the cold water temperature is between a first temperature A and a second temperature B, the first valve is closed and the second valve is opened, and the cold water flows into the water supply container. Otherwise, the first valve is open and the second valve is closed, and the cold water flows back to the return water container. The first temperature A is lower than the second temperature B.

[0014] In some embodiments, the return water pipe is also equipped with a flow meter. When the cold water temperature is lower than a third temperature C and / or the flow rate of the flow meter is lower than a set flow rate, the first valve opens and the second valve closes, and the third temperature C is lower than the first temperature A.

[0015] In some embodiments, the cold water supply device further includes an outlet pipe, the two ends of which are respectively connected to the return water outlet and the cold water inlet of the second fluid channel. A first booster pump is provided on the outlet pipe. When the cold water temperature is lower than the third temperature C and / or the flow rate of the flow meter is lower than the set flow rate, the power of the first booster pump is increased and / or the power of the second heat exchanger is decreased.

[0016] In some embodiments, the return water container is provided with a plurality of return water outlets, each of the return water outlets is connected to the outlet pipe through a branch pipe, and each of the branch pipes is provided with a first booster pump.

[0017] In some embodiments, a first pipeline and a second pipeline are provided between the refrigerant heat exchange channel and the first fluid channel to communicate with each other. A circulation pump and a third valve are provided on the first pipeline or the second pipeline. The third valve is used to regulate the flow rate of the refrigerant in the first fluid channel.

[0018] In some embodiments, a second temperature sensor is provided on the first pipeline and / or the second pipeline, the second temperature sensor being used to detect the temperature of the refrigerant at the refrigerant inlet and / or refrigerant outlet of the first fluid channel.

[0019] In some embodiments, the water outlet is provided with a water supply pipe to be connected to the cold water consumption point, and the water supply pipe is provided with a second booster pump.

[0020] In some embodiments, at least one sidewall of the return water container and the supply water container are in contact for heat exchange.

[0021] The beneficial effects of this utility model are:

[0022] The cold water supply device provided by this utility model utilizes ambient cold air to create a refrigeration circuit by setting a second heat exchanger, which can save a significant amount of energy, especially in cold weather with low ambient temperatures. By setting a return water container, a water temperature regulation circuit is formed between the return water container and the second fluid channel, enabling temperature control and regulation of the cold water in the second fluid channel. When the cold water temperature is suitable, the supply water container is selectively activated to supply water to the cold water consumption points, thereby controlling the cold water temperature at the cold water consumption points. This improves the stability of the cold water temperature and facilitates the control of the milk cooling process. Simultaneously, the return water container exchanges heat with the second fluid channel through the water temperature regulation circuit, while the second fluid channel exchanges heat with the first fluid channel. The higher temperature cold water in the return water container can regulate the temperature of the low-temperature refrigerant in the first fluid channel, effectively preventing the first heat exchanger from freezing due to excessively low refrigerant temperature. This ensures the continuity of cold water supply and improves the production efficiency of the milk processing process. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the cold water supply device provided in this embodiment of the utility model.

[0024] In the picture:

[0025] 1. First heat exchanger; 11. Cold water inlet; 12. Cold water outlet; 13. Refrigerant inlet; 14. Refrigerant outlet;

[0026] 2. Second heat exchanger; 21. First pipeline; 22. Second pipeline; 23. Circulation pump; 24. Third valve; 25. Second temperature sensor;

[0027] 3. Return water container; 31. Return water outlet; 32. Return water inlet;

[0028] 4. Water supply container; 41. Water inlet; 42. Water outlet; 43. Water supply pipe; 44. Second booster pump;

[0029] 5. Cold water consumption points;

[0030] 6. Return water pipe; 61. First valve; 62. First temperature sensor; 63. Flow meter;

[0031] 7. Water inlet pipe; 71. Second valve;

[0032] 8. Water outlet pipe; 81. First booster pump; 82. Branch pipe; 83. Third temperature sensor. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0034] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] This utility model provides a cold water supply device suitable for cold water cooling processes in production workshops, such as cooling processes after high-temperature sterilization of milk. Figure 1As shown, the cold water supply device includes a first heat exchanger 1, a second heat exchanger 2, a return water container 3, and a supply water container 4. The first heat exchanger 1 has a first fluid channel and a second fluid channel that can exchange heat with each other. The second heat exchanger 2 has a refrigerant heat exchange channel that can exchange heat with the ambient cold air to lower the temperature. The refrigerant heat exchange channel contains refrigerant and is connected to the first fluid channel to form a refrigeration circuit. The return water container 3 has a return water outlet 31 and a return water inlet 32. The return water outlet 31 is connected to the cold water inlet 11 of the second fluid channel, and the return water inlet 32 ​​is connected to the cold water outlet 12 of the second fluid channel to form a water temperature regulation circuit. The supply water container 4 has an inlet 41 and an outlet 42. The inlet 41 is selectively connected to the cold water outlet 12 of the second fluid channel. The outlet 42 of the supply water container 4 is connected to the cold water consumption point 5 to provide cold water.

[0038] The cold water supply device provided by this utility model, by setting up a second heat exchanger 2, allows the refrigerant heat exchange channel within the second heat exchanger 2 to exchange heat with the ambient cold air for cooling, thereby utilizing the ambient cold air as the cold source for the refrigeration circuit. This is especially beneficial in extremely cold weather with low ambient temperatures (-20℃ to -30℃), resulting in significant energy savings. By setting up a return water container 3, a water temperature regulation circuit is formed between the return water container 3 and the second fluid channel, enabling temperature control and regulation of the cold water in the second fluid channel. When the cold water temperature is suitable, the supply water container 4 is selectively activated, supplying water to the cold water consumption point 5, thus achieving temperature control of the cold water at the cold water consumption point 5. The cold water supply device improves the stability of the cold water temperature, making it easier to control the milk cooling process. When the ambient temperature is too low, the refrigerant temperature in the first fluid channel may freeze and become inoperable or reduce its efficiency. Through the return water container 3 and the water temperature regulation loop, heat exchange occurs with the second fluid channel. The temperature of the cold water in the return water container 3 gradually decreases, while the second fluid channel exchanges heat with the first fluid channel. The higher temperature cold water in the return water container 3 can regulate the temperature of the low-temperature refrigerant in the first fluid channel, increasing the heat exchange rate and effectively preventing the first heat exchanger 1 from freezing due to the low refrigerant temperature. This ensures the continuity of the cold water supply and improves the production efficiency of the milk processing process. It can be understood that the cold water supply device of this invention can effectively control the temperature of the supplied cold water and prevent the first heat exchanger 1 from freezing. The cold water supply has high stability and can significantly save energy. The first heat exchanger 1 can be a plate heat exchanger, and the second heat exchanger 2 can be an air-cooled heat exchanger.

[0039] In some embodiments, the cold water supply device further includes a return pipe 6 and an inlet pipe 7. The two ends of the return pipe 6 are connected to the cold water outlet 12 and the return water inlet 32, respectively, and a first valve 61 is provided on the return pipe 6. One end of the inlet pipe 7 is connected to the return pipe 6 between the cold water outlet 12 and the first valve 61, and the other end of the inlet pipe 7 is connected to the inlet 41. A second valve 71 is provided on the inlet pipe 7. The first valve 61 and the second valve 71 can be alternately opened so that the cold water outlet 12 alternately opens the return water inlet 32 ​​and the inlet 41.

[0040] like Figure 1 As shown, when the first valve 61 is open and the second valve 71 is closed, it is used to cool the cold water in the return water container 3 until the cold water temperature is suitable, resulting in stable cold water. Then, the first valve 61 closes and the second valve 71 opens. At this time, the cold water with a suitable temperature in the second fluid channel directly enters the water supply container 4, which supplies water to the cold water consumption point 5. It can be understood that by setting the first valve 61 and the second valve 71, the return water container 3 and the water supply container 4 can work alternately, which is beneficial for the cold water in the water supply container 4 to have a set temperature, thereby improving the temperature stability of the cold water and improving the cooling efficiency of the milk cooling process. Both the first valve 61 and the second valve 71 are electric valves to facilitate electric operation control. Specifically, they can be on / off valves or shut-off valves, or other valves with on / off or flow regulation functions.

[0041] In some embodiments, a first temperature sensor 62 is provided on the return water pipe 6. The first temperature sensor 62 is used to detect the cold water temperature at the cold water outlet 12. When the cold water temperature is between the first temperature A and the second temperature B, the first valve 61 is closed and the second valve 71 is opened, and the cold water flows into the water supply container 4; otherwise, the first valve 61 is open and the second valve 71 is closed, and the cold water flows back to the return water container 3, and the first temperature A is lower than the second temperature B.

[0042] The first temperature A and the second temperature B can be set according to the temperature requirement of the cold water consumption point 5. Cold water within this temperature range is considered to be at a suitable temperature. When the cold water temperature is suitable, it can be directly supplied to the cold water consumption point 5 through the water supply container 4. When the cold water temperature is unsuitable, i.e., if the cold water temperature is too high, the cooling effect will be reduced, and the cooling rate of the milk cannot be controlled. Therefore, the cold water is recycled to the return water container 3 and circulated through the water temperature regulation loop to cool it down until the temperature is suitable. If the cold water temperature is too low, there may be a small flow rate of cold water or it may freeze easily, which will also affect the continuous cooling of the milk. In this case, the cold water needs to be recycled to the return water container 3. After mixing with the higher-temperature return water in the return water container 3, the water temperature is circulated through the water temperature regulation loop to regulate the water temperature until the temperature is suitable. At this time, the cold water with the lower temperature mixes with the cold water with the higher temperature in the return water container 3 and enters the water temperature regulation circuit. At the same time, it can exchange heat with the refrigerant in the second fluid channel while exchanging heat with the first fluid channel and the second fluid channel. This avoids the first heat exchanger 1 freezing due to the refrigerant being too cold, which would affect normal operation.

[0043] In some embodiments, the return water pipe 6 is also provided with a flow meter 63. When the cold water temperature is lower than the third temperature C and / or the flow rate of the flow meter 63 is lower than the set flow rate, the first valve 61 is opened and the second valve 71 is closed, and the third temperature C is lower than the first temperature A.

[0044] like Figure 1 The function of flow meter 63 is to detect and monitor the flow rate of cold water in the return water pipe 6. When flow meter 63 shows a very low flow rate, there may be a blockage in the second fluid channel within the first heat exchanger 1, or the cold water may freeze due to excessively low temperature, leading to a reduction in water flow. If not addressed promptly, this could cause the first heat exchanger 1 to malfunction, affecting the normal milk production process. Therefore, this embodiment uses flow meter 63 to detect the operating status of the first heat exchanger 1. Additionally, if the cold water temperature at the cold water outlet 12 is too low, such as below the third temperature C, there may also be a risk of freezing. In this case, the flow rate or temperature of the cold water in the second fluid channel may be low, making it unsuitable for introduction into the milk cooling production line for cooling. In this situation, the cold water is recycled back to the return water container 3 through the return water pipe 6 for timely treatment. Treatment methods include, but are not limited to, increasing the flow rate or water pressure of the cold water in the return water pipe 6 and the second fluid channel, or adjusting the temperature of the cold water in the second fluid channel and the return water pipe 6, such as heating the return water container 3. The first temperature A, the second temperature B, and the third temperature C are all set according to the actual cooling efficiency requirements, and no specific restrictions are imposed in this embodiment.

[0045] In some embodiments, the cold water supply device further includes an outlet pipe 8, with both ends of the outlet pipe 8 connected to the return water outlet 31 and the cold water inlet 11 of the second fluid channel, respectively. The outlet pipe 8 is equipped with a first booster pump 81, which increases the power of the first booster pump 81 and / or decreases the power of the second heat exchanger 2 when the cold water temperature is lower than the third temperature C and / or the flow rate of the flow meter 63 is lower than the set flow rate.

[0046] It can be understood that the outlet pipe 8, the second fluid channel, the return pipe 6, and the return container 3 form a water temperature regulation loop. Cold water in the return container 3 enters the second fluid channel through the outlet pipe 8 and exchanges heat with the refrigerant in the first fluid channel, causing its temperature to drop. The cooled water then returns to the return container 3 through the return pipe 6 until the temperature of the cold water in the return container 3 is stable and uniform, reaching a suitable temperature, before the inlet pipe 7 is connected to supply water. The first booster pump 81 pumps the cold water from the return container 3, providing circulation power for the cold water in the water temperature regulation loop. Simultaneously, when there is a risk of freezing in the first heat exchanger 1, such as when the cold water temperature is lower than the third temperature C or the flow rate is lower than the set flow rate, a freezing risk is considered present. In this case, increasing the power of the first booster pump 81 increases the cold water pressure and flow rate in the second fluid channel, thereby preventing freezing. Conversely, reducing the power of the second heat exchanger 2 prevents the refrigerant temperature in the first fluid channel from becoming too low, thereby altering the heat exchange efficiency between the first and second fluid channels and preventing freezing. Depending on the actual risk situation, the freezing risk can be quickly resolved by either increasing the power of the first booster pump 81 alone, decreasing the power of the second heat exchanger 2 alone, or increasing the power of the first booster pump 81 while decreasing the power of the second heat exchanger 2. In some embodiments, a third temperature sensor 83 is installed on the outlet pipe 8, located near the cold water inlet 11, to detect the temperature of the cold water entering the second fluid channel, thereby adjusting the power of the second heat exchanger 2. The difference between the temperatures detected by the first temperature sensor 62 and the third temperature sensor 83 can be used to monitor and detect the heat exchange efficiency of the first heat exchanger 1, thus providing a basis for adjusting the working efficiency of the temperature regulation loop and the refrigeration loop.

[0047] In some embodiments, the return water container 3 is provided with a plurality of return water outlets 31, each return water outlet 31 is connected to the water outlet pipe 8 through a branch pipe 82, and a first booster pump 81 is provided on each branch pipe 82.

[0048] by Figure 1As shown in the example, the return water container 3 is provided with two return water outlets 31. The return water outlets 31 are provided with branch pipes 82 connected to the water outlet pipes 8. Each branch pipe 82 is provided with a first booster pump 81. When the two first booster pumps 81 are turned on at the same time, the circulation pressure of the cold water in the water temperature regulation loop can be further increased, and the thawing of the cold water in the second fluid channel can be accelerated to effectively prevent the first heat exchanger 1 from freezing, thereby improving the stability of the cold water supply.

[0049] In some embodiments, a first pipe 21 and a second pipe 22 are provided between the refrigerant heat exchange channel and the first fluid channel to communicate with each other. A circulation pump 23 and a third valve 24 are provided on the first pipe 21 or the second pipe 22. The third valve 24 is used to regulate the flow rate of the refrigerant in the first fluid channel.

[0050] like Figure 1 A refrigeration circuit is formed between the refrigerant heat exchange channel, the second pipe 22, the first fluid channel, and the first pipe 21 to provide low-temperature refrigerant. The two ends of the first pipe 21 are connected to the inlet of the refrigerant heat exchange channel and the refrigerant outlet 14 of the first fluid channel, respectively. The two ends of the second pipe 22 are connected to the outlet of the refrigerant heat exchange channel and the refrigerant inlet 13 of the first fluid channel, respectively. The refrigerant exchanges heat with ambient air and cools down within the refrigerant heat exchange channel of the second heat exchanger 2. The circulating pump 23 provides circulation power for the refrigerant in the refrigeration circuit and can regulate the flow rate and supply pressure of the refrigerant in the refrigeration circuit. The third valve 24 is used to regulate the flow rate of the refrigerant. When the temperature of the refrigerant is too low, the flow rate is reduced to prevent the first heat exchanger 1 from freezing; when it is necessary to increase the heat exchange efficiency within the first heat exchanger 1, the flow rate is increased. The flow rate, velocity, and pressure of the refrigerant can be adjusted simultaneously to quickly improve the cooling effect.

[0051] In some embodiments, a second temperature sensor 25 is provided on the first pipeline 21 and / or the second pipeline 22. The second temperature sensor 25 is used to detect the temperature of the refrigerant at the refrigerant inlet 13 and / or the refrigerant outlet 14 of the first fluid channel.

[0052] like Figure 1 As shown, both the first pipe 21 and the second pipe 22 are equipped with a first temperature sensor 62, which is used to detect the temperature of the refrigerant at the refrigerant inlet 13 and / or refrigerant outlet 14 of the first fluid channel, respectively. Based on the measured temperatures of the refrigerant inlet 13 and the refrigerant outlet 14, and the temperature difference between them, the heat exchange efficiency of the first heat exchanger 1 can be monitored and controlled, and the power of the second heat exchanger 2 can be adjusted accordingly. When the measured temperature of the refrigerant inlet 13 is low or the temperature difference is large, the power of the second heat exchanger 2 can be increased to further reduce the temperature of the refrigerant in the refrigeration circuit. When the temperature difference is small, the power of the second heat exchanger 2 can be reduced to save energy.

[0053] In some embodiments, the outlet 42 is provided with a water supply pipe 43 to be connected to the cold water consumption point 5, and a second booster pump 44 is provided on the water supply pipe 43.

[0054] The cold water at a suitable temperature in the water supply container 4 is transported to the cold water consumption point 5 through the water supply pipe 43 by the second booster pump 44 for the cooling process.

[0055] In some embodiments, at least one sidewall of the return water container 3 and the supply water container 4 are in contact for heat exchange.

[0056] The return water container 3 and the supply water container 4 can be water tanks or water tanks respectively. By attaching the side walls of the return water container 3 and the supply water container 4 together, heat exchange between the cold water in the return water container 3 and the supply water container 4 can be achieved, which helps to ensure that the cold water in the supply water container 4 has a stable temperature.

[0057] The cold water supply device provided by this utility model can provide cold water for the production workshop and can completely eliminate the equipment risk caused by the freezing of the plate heat exchanger 1 of the first heat exchanger; the air cooling efficiency is improved and the cold water supply can be greatly increased; the cold water temperature at the cold water outlet 12 of the second flow channel can directly meet the usage requirements without the need for secondary cooling by a refrigeration unit.

[0058] Specifically, based on factory testing, using a traditional chilled water supply system with two air-cooled systems and a total cooling capacity of 2200KW, the existing process cannot achieve the required operating conditions with a single cooling cycle. Ammonia plate heat exchangers must be activated for secondary cooling to meet the chilled water temperature requirements (not exceeding 4℃). Furthermore, when the outdoor ambient temperature reaches -20℃ to -30℃, the existing process frequently experiences plate heat exchanger freezing, resulting in insufficient chilled water supply stability and failing to achieve the expected energy-saving effect.

[0059] A comparative test was conducted using the improved chilled water supply device provided by this utility model. Refrigeration system COP: The ratio of the annual cooling capacity (GJ) of the system (excluding air-cooled and tower water systems) to the annual power consumption (GJ) of the system (excluding air-cooled and tower water systems), dimensionless. 1 kWh = 0.0036 GJ. Calculation formula: COP = Cooling capacity / (Power consumption × 0.0036); Improvement value = Improved COP value - Unimproved COP value;

[0060] Taking a certain factory as an example, from January to March and November to December 2024, the factory used an air-cooled system (i.e., the second heat exchanger 2), and the total cooling capacity used in the five months was 12648.65 GJ. Based on this cooling capacity, the electricity saving = monthly cooling capacity / (increase rate × 0.0036), see Table 1.

[0061] Table 1. Statistics on Electricity Savings

[0062]

[0063] Excluding the auxiliary power consumption of the skid-mounted chiller unit (refrigeration unit) and the influence of weather temperature, the estimated electricity savings are 425,421.43 kWh. With an average purchased electricity price of RMB 0.63 per kWh (excluding tax), the project's estimated savings (excluding tax) are 425,421.43 kWh × 0.63 kWh / ton = RMB 268,015.50. This utility model provides a chilled water supply device that achieves efficiency improvement and cost reduction.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cold water supply device, characterized by, include: The first heat exchanger (1) has a first fluid channel and a second fluid channel that can exchange heat with each other. The second heat exchanger (2) has a refrigerant heat exchange channel, which can exchange heat with the ambient cold air to cool down; the refrigerant heat exchange channel contains a refrigerant, and the refrigerant heat exchange channel is connected to the first fluid channel to form a refrigeration circuit; A return water container (3) has a return water outlet (31) and a return water inlet (32). The return water outlet (31) is connected to the cold water inlet (11) of the second fluid channel, and the return water inlet (32) is connected to the cold water outlet (12) of the second fluid channel to form a water temperature regulation loop. A water supply container (4) having an inlet (41) and an outlet (42), the inlet (41) being selectively connected to the cold water outlet (12) of the second fluid channel; the outlet (42) of the water supply container (4) being connected to a cold water consumption point (5) to provide cold water.

2. The cold water supply device according to claim 1, characterized in that Also includes: A return water pipe (6) is provided, with its two ends connected to the cold water outlet (12) and the return water inlet (32) respectively, and a first valve (61) is provided on the return water pipe (6). The water inlet pipe (7) has one end connected to the return water pipe (6) between the cold water outlet (12) and the first valve (61), and the other end connected to the water inlet (41). The water inlet pipe (7) is provided with a second valve (71). The first valve (61) and the second valve (71) can be alternately opened so that the cold water outlet (12) alternately opens the return water inlet (32) and the water inlet (41).

3. The cold water supply device according to claim 2, characterized in that, The return water pipe (6) is equipped with a first temperature sensor (62), which is used to detect the cold water temperature at the cold water outlet (12). When the cold water temperature is between the first temperature A and the second temperature B, the first valve (61) is closed and the second valve (71) is opened, and the cold water flows into the water supply container (4); otherwise, the first valve (61) is opened and the second valve (71) is closed, and the cold water flows back to the return water container (3), where the first temperature A is lower than the second temperature B.

4. The cold water supply device according to claim 3, characterized in that, The return water pipe (6) is also equipped with a flow meter (63). When the cold water temperature is lower than the third temperature C and / or the flow rate of the flow meter (63) is lower than the set flow rate, the first valve (61) opens and the second valve (71) closes, and the third temperature C is lower than the first temperature A.

5. The cold water supply device according to claim 4, characterized in that, It also includes a water outlet pipe (8), the two ends of which are connected to the return water outlet (31) and the cold water inlet (11) of the second fluid channel, respectively. A first booster pump (81) is provided on the water outlet pipe (8). When the cold water temperature is lower than the third temperature C and / or the flow rate of the flow meter (63) is lower than the set flow rate, the power of the first booster pump (81) is increased and / or the power of the second heat exchanger (2) is reduced.

6. The cold water supply device according to claim 5, characterized in that, The return water container (3) is provided with a plurality of return water outlets (31), each of the return water outlets (31) is connected to the water outlet pipe (8) through a branch pipe (82), and each of the branch pipes (82) is provided with a first booster pump (81).

7. The cold water supply device according to claim 1, characterized in that, A first pipeline (21) and a second pipeline (22) are provided between the heat exchange channel of the refrigerant and the first fluid channel to connect them. A circulation pump (23) and a third valve (24) are provided on the first pipeline (21) or the second pipeline (22). The third valve (24) is used to regulate the flow rate of the refrigerant in the first fluid channel.

8. The cold water supply device according to claim 7, characterized in that, A second temperature sensor (25) is provided on the first pipeline (21) and / or the second pipeline (22), and the second temperature sensor (25) is used to detect the temperature of the refrigerant at the refrigerant inlet (13) and / or refrigerant outlet (14) of the first fluid channel.

9. The cold water supply device according to any one of claims 1-8, characterized in that, The outlet (42) is provided with a water supply pipe (43) to be connected to the cold water consumption point (5), and a second booster pump (44) is provided on the water supply pipe (43).

10. The cold water supply device according to any one of claims 1-8, characterized in that, At least one side wall of the return water container (3) and the supply water container (4) are in contact for heat exchange.

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