Double-cold-source indoor unit and refrigerating unit

Abstract

The invention discloses a double-cold-source indoor unit and a refrigerating unit, the double-cold-source indoor unit comprises a cabinet, a fan, a water coil pipe and a fluorine coil pipe, the cabinet is provided with an air inlet and an air outlet, the fan, the water coil pipe and the fluorine coil pipe are installed in the cabinet, the water coil pipe comprises a plurality of first pipelines which are communicated with one another, the first pipelines are arranged in rows, and the fluorine coil pipe is arranged in the cabinet. The fluorine coil pipe comprises a plurality of second pipelines which are communicated with one another, the plurality of second pipelines are arranged in rows, a plurality of rows of second pipelines are formed, the rows of first pipelines and the rows of second pipelines are arranged in a staggered mode in the direction from the air inlet to the air outlet, and the first row of first pipelines are closer to the air inlet than the first row of second pipelines. The first pipelines and the second pipelines are arranged in the staggered mode, so that the heat exchange coefficient can be increased, meanwhile, hot air flow firstly flows through the first pipelines in the first column and then flows through the second pipelines in the first column, then the first pipelines can be prevented from being frozen and cracked, and normal operation of the refrigerating unit is guaranteed.

Description

[Technical field]

[0001] The present application relates to the field of refrigeration technology, and in particular to a dual-cold-source indoor unit and a refrigeration unit including the dual-cold-source indoor unit. [Background technology]

[0002] Refrigeration units (such as air conditioning units) play an important role in modern life, providing a comfortable and healthy indoor environment. In related technologies, refrigeration units used for indoor cooling usually remove indoor heat through a refrigeration cycle to reduce the air temperature, and then resupply the cooled air to the room through air circulation to meet the indoor temperature requirements.

[0003] In the process of realizing the invention, the inventors found that there are at least the following problems in the prior art: the water coil in the refrigeration unit is prone to freezing and cracking, which affects the normal operation of the refrigeration unit. [Summary of the invention]

[0004] In order to overcome the problems existing in the above-mentioned prior art, the main purpose of the present application is to provide a refrigeration unit that can prevent the coil from being frozen and cracked.

[0005] In order to achieve the above objectives, this application specifically adopts the following technical solutions:

[0006] The present application provides a dual-cold source indoor unit, the dual-cold source indoor unit comprising:

[0007] A cabinet, wherein the cabinet is provided with an air inlet and an air outlet;

[0008] A fan, wherein the fan is arranged in the cabinet;

[0009] A water coil, the water coil is installed in the cabinet, and the water coil includes a plurality of first pipes that are interconnected, and the plurality of first pipes are arranged in a row to form a plurality of rows of first pipes; and

[0010] A fluorine coil, the fluorine coil is installed in the cabinet, and the fluorine coil comprises a plurality of second pipes that are interconnected, and the plurality of second pipes are arranged in a row to form a plurality of rows of second pipes;

[0011] Wherein, along the direction from the air inlet to the outlet air, each column of the first pipes and each column of the second pipes are arranged alternately, and the first column of the first pipes is closer to the air inlet than the first column of the second pipes.

[0012] In some embodiments, the inner wall of each of the first pipes is set to be a smooth surface, and the inner wall of each of the second pipes is provided with threads.

[0013] In some embodiments, the dual cold source indoor unit further includes a protective net, the protective net is arranged at the air inlet, and the fan is arranged at the air outlet.

[0014] In some embodiments, the dual cold source indoor unit also includes a first pipeline, a second pipeline and a two-way valve, the first pipeline is connected to the input end of the water coil, the second pipeline is connected to the output end of the water coil, and the two-way valve is connected to the second pipeline and is located in the cabinet.

[0015] In some embodiments, the dual cold source indoor unit further includes an air pipe and a first liquid pipe, the air pipe is connected to the output end of the fluorine coil, and the first liquid pipe is connected to the input end of the fluorine coil.

[0016] In some embodiments, the dual cold source indoor unit further includes a plurality of electronic expansion valves, which are connected in parallel to the first liquid pipe and are located in the cabinet.

[0017] Accordingly, the present application also provides a refrigeration unit, the refrigeration unit comprising:

[0018] A dual cold source indoor unit as described in any of the above embodiments;

[0019] A chilled water outdoor unit, the chilled water outdoor unit is detachably connected to the water coil and is used to provide cooling liquid to the water coil;

[0020] A fluorine pump outdoor unit, which is detachably connected to the fluorine coil and is used to cool the refrigerant and then provide it to the fluorine coil; and

[0021] A controller is connected to the chilled water outdoor unit, the fluorine pump outdoor unit and the dual cold source indoor unit respectively, and is used to control the operation of the chilled water outdoor unit, the fluorine pump outdoor unit and the dual cold source indoor unit according to the outdoor temperature, so that the water coil and / or the fluorine coil can exchange heat with the indoor air.

[0022] In some embodiments, the fluorine pump outdoor unit includes a body, a fluorine pump, a condenser and a second liquid pipe. The fluorine pump and the condenser are respectively installed in the body, and the output end of the fluorine pump is detachably connected to the input end of the fluorine coil. The input end of the fluorine pump is connected to the output end of the condenser through the second liquid pipe, and the input end of the condenser is detachably connected to the output end of the fluorine coil.

[0023] In some embodiments, the fluorine pump outdoor unit further includes a liquid storage tank, which is disposed in the machine body and connected to an input end of the fluorine pump.

[0024] In some embodiments, there are multiple dual-cold source indoor units, and each of the water coils in the multiple dual-cold source indoor units is detachably connected to the chilled water outdoor unit, and the fluorine coils in the multiple dual-cold source indoor units are detachably connected to the fluorine pump outdoor unit.

[0025] The dual cold source indoor unit of the present application includes a cabinet, a fan, a water coil and a fluorine coil. The cabinet is provided with an air inlet and an air outlet. The fan, the water coil and the fluorine coil are installed in the cabinet respectively. The water coil includes a plurality of first pipes interconnected with each other, and the plurality of first pipes are arranged in a row to form a plurality of first pipes in a row. The fluorine coil includes a plurality of second pipes interconnected with each other, and the plurality of second pipes are arranged in a row to form a plurality of second pipes in a row. In the direction from the air inlet to the air outlet, the first pipes in each row and the second pipes in each row are arranged in a staggered manner, and the first pipe in the first row is closer to the air inlet than the second pipe in the first row. Compared with the prior art, the present application can improve the heat exchange coefficient by staggering the first pipes in each row and the second pipes in each row. At the same time, the hot air flow first flows through the first pipe in the first row and then flows through the second pipe in the first row, thereby preventing the first pipe from being frozen and cracked, and ensuring the normal operation of the refrigeration unit.

Brief Description of the Drawings

[0026] Figure 1 A schematic diagram of a refrigeration unit provided in an embodiment of the present application.

[0027] Figure 2 This is a cross-sectional view of the distribution of the water coil and the fluorine coil provided in the embodiments of the present application.

[0028] Figure 3 This is a structural diagram of multiple dual-cold source indoor units in parallel provided in an embodiment of the present application.

[0029] Figure ID:

[0030] 1. Dual cold source indoor unit; 10. Cabinet; 11. Water coil; 111. First pipeline; 12. Fluorine coil; 121. Second pipeline; 13. Fan; 2. Chilled water outdoor unit; 3. Fluorine pump outdoor unit; 31. Fluorine pump; 32. Condenser; 33. Liquid storage tank; 34. Second liquid pipe; 4. Gas pipe; 5. First liquid pipe; 6. First pipeline; 7. Second pipeline; 8. Electronic expansion valve; 9. Two-way valve. [Specific implementation method]

[0031] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0034] Reference Figure 1 As shown, the embodiment of the present application discloses a refrigeration unit, which includes a dual cold source indoor unit 1, a chilled water outdoor unit 2, a fluorine pump outdoor unit 3 and a controller (not shown in the figure), and the dual cold source indoor unit 1 includes a cabinet 10 ( Figure 3 ), water coil 11, fluorine coil 12 and fan 13, the cabinet 10 is provided with an air inlet and an air outlet, the water coil 11, fluorine coil 12 and fan 13 are respectively installed in the cabinet 10, wherein the fan 13 is used to suck the indoor air into the cabinet 10 through the air inlet of the cabinet 10 and discharge it through the air outlet, and the water coil 11 and fluorine coil 12 are respectively used to exchange heat with the indoor air. The chilled water outdoor unit 2 is detachably connected to the water coil 11, and is used to provide cooling liquid to the water coil 11, wherein the cooling liquid can be water. The fluorine pump outdoor unit 3 is detachably connected to the fluorine coil 12, and is used to provide the refrigerant to the fluorine coil 12 after cooling, wherein the refrigerant can be Freon, which is a type of synthetic fluorocarbon compound, common ones are R22 (chlorodifluoromethane), R1234a (1,1,1,2-tetrafluoroethane), etc. The controller is connected to the chilled water outdoor unit 2, the fluorine pump outdoor unit 3 and the dual cold source indoor unit 1 respectively, and is used to control the operation of the chilled water outdoor unit 2, the fluorine pump outdoor unit 3 and the dual cold source indoor unit 1 according to the outdoor temperature, so that the water coil 11 and / or the fluorine coil 12 can exchange heat with the indoor air. In this embodiment, the fan 13 can be set as a centrifugal fan, and the air inlet and the air outlet can be set at the side of the cabinet 10, such as the front and the rear.

[0035] The present application adopts a refrigerant fluorine pump refrigeration mode and a chilled water cooling method for combined refrigeration to reduce the indoor temperature. Since water resources are relatively abundant, the investment is more economical, and the two refrigeration methods can be used alternately or together according to changes in ambient temperature, saving energy consumption and meeting customer needs. At the same time, the chilled water outdoor unit 2, the fluorine pump outdoor unit 3 and the dual cold source indoor unit 1 are all detachably connected for easy storage and transportation.

[0036] Exemplarily, when the outdoor temperature is within the first preset temperature range, the controller controls the chilled water outdoor unit 2 to provide the water coil 11 with a coolant with a lower temperature, so that the coolant with a lower temperature flows into the water coil 11. At this time, the fan 13 draws indoor air into the cabinet. After the coolant in the water coil 11 exchanges heat with the air in the cabinet 10, the temperature of the coolant in the water coil 11 increases and flows back to the chilled water outdoor unit 2. The air temperature in the cabinet 10 decreases and is discharged from the air outlet, so that the indoor temperature decreases, realizing the water-cooled refrigeration mode; when the outdoor temperature is within the second preset temperature range, the controller controls the chilled water outdoor unit 2 to provide the water coil 11 with a coolant with a lower temperature, so that the coolant with a lower temperature flows into the water coil 11. At the same time, the controller also controls the fluorine pump outdoor unit 3 to provide the fluorine coil 12 with a refrigerant with a lower temperature, so that the refrigerant with a lower temperature flows into the fluorine coil 12. At this time, the fan 13 draws indoor air into the cabinet. The coolant in the water coil 11 exchanges heat with the air in the cabinet 10 The refrigerant in the fluorine coil 12 exchanges heat with the air in the cabinet 10, and then the coolant temperature rises and flows back to the chilled water outdoor unit 2, the refrigerant temperature rises and flows back to the fluorine pump outdoor unit 3, the air temperature in the cabinet 10 decreases and is discharged from the air outlet of the cabinet 10, so that the indoor temperature is reduced, and the dual cold source refrigeration mode is realized; when the outdoor temperature is in the third preset temperature range, the controller controls the fluorine pump outdoor unit 3 to provide the fluorine coil 12 with a lower temperature refrigerant, so that the lower temperature refrigerant flows into the fluorine coil 12, at this time, the fan 13 draws the indoor air into the cabinet 10, and the refrigerant in the fluorine coil 12 exchanges heat with the air in the cabinet 10, and the refrigerant temperature rises and flows back to the fluorine pump outdoor unit 3, the air temperature in the cabinet 10 decreases and is discharged from the air outlet of the cabinet 10, so that the indoor temperature is reduced, and the refrigerant refrigeration mode is realized, wherein the temperature in the first preset temperature range is higher than the temperature in the second preset temperature range, and the temperature in the second preset temperature range is higher than the temperature in the third preset temperature range.

[0037] The refrigeration mode of the refrigeration unit in the related technology is single, which is difficult to meet the needs of users. The present application can automatically switch between three refrigeration modes according to the detected real-time outdoor temperature. When the outdoor temperature is high, the unit automatically switches to the chilled water refrigeration mode; when the outdoor temperature is low, the unit automatically switches to the dual-power refrigeration mode, and the chilled water and fluorine pump dual-power refrigeration run at the same time; when the outdoor temperature is lower, the unit automatically switches to the fluorine pump circulation refrigeration mode, using the fluorine pump to run, and the water coil 11 stops working, thereby switching the refrigeration mode according to the environmental conditions, saving energy consumption and meeting customer needs.

[0038] Reference Figure 2 As shown, A is the air flow direction, B is the coolant flow direction, and C is the refrigerant flow direction. The water coil 11 includes a plurality of first pipes 111, which are arranged in a row to form a plurality of first pipes 111, and each first pipe 111 is interconnected. The fluorine coil 12 includes a plurality of second pipes 121, which are arranged in a row to form a plurality of second pipes 121, and each second pipe 121 is interconnected. In this embodiment, the first pipe 111 and the second pipe 121 can both be copper pipes. The chilled water outdoor unit 2 is connected to each first pipe 111, and the fluorine pump outdoor unit 3 is connected to each second pipe 121. Specifically, two adjacent first pipes 111 can be connected at the end or at the tail; two adjacent second pipes 121 can be connected at the end or at the tail.

[0039] Exemplarily, if the first first pipe 111 is connected to the second first pipe 111 at the end, the second first pipe 111 is connected to the third first pipe 111 at the tail, the third first pipe 111 is connected to the fourth first pipe 111 at the end, and so on. The connection method of the second pipe 121 is the same as the connection method of the first pipe 111, which is not repeated here.

[0040] Further, along the direction of the air inlet of the cabinet 10 pointing to the outlet air, each row of the first pipes 111 and each row of the second pipes 121 are arranged in a staggered manner, and the first row of the first pipes 111 is closer to the air inlet of the cabinet 10 than the first row of the second pipes 121, and the inner wall of each first pipe 111 is set as a smooth surface, and the inner wall of each second pipe 121 is provided with a thread. When the indoor air flows from the air inlet of the cabinet 10 to the air outlet of the cabinet 10 under the action of the fan 13, the air first flows through the first row of the first pipes 111 and performs heat exchange with the first row of the first pipes 111, then flows to the first row of the second pipes 121 and performs heat exchange with the first row of the second pipes 121, then flows to the second row of the first pipes 111 and performs heat exchange with the second row of the first pipes 111, then flows to the second row of the second pipes 121 and performs heat exchange with the second row of the second pipes 121, and so on, until it flows through all the pipes and flows out from the air outlet of the cabinet 10.

[0041] In this embodiment, the heat exchange coefficient can be improved by cross-distributing each column of the first pipes 111 and each column of the second pipes 121, and the first column of the first pipes 111 is closer to the air inlet of the cabinet 10 than the first column of the second pipes 121, that is, the first column of the first pipes 111 is located upstream of the air flow, so that the hot air flow first flows through the first column of the first pipes 111 and then flows through the first column of the second pipes 121 (if the hot air flow first flows through the second pipe 121, the second pipe 121 cools the hot air flow, and the cooled hot air flow is likely to cause the first pipe 111 to freeze and crack when it passes through the first pipe 111 again), thereby preventing the first pipe 111 from being frozen and cracked, thereby achieving the purpose of cooling the hot air flow, reducing the energy consumption of the unit, reducing the energy consumption cost, and improving the cooling capacity and efficiency of the unit. At the same time, the inner wall of the first pipe 111 is set to a smooth surface, so that impurities and dirt in the coolant are not easily attached to the inner wall of the first pipe 111, maintaining the smooth flow of the coolant in the first pipe 111 and ensuring the cooling effect; the inner wall of the second pipe 121 is provided with threads, thereby increasing the heat exchange area of ​​the refrigerant and improving the heat exchange efficiency.

[0042] For example, Figure 2The two rows of first pipes 111 and the two rows of second pipes 121 in the example are used for explanation. For the first row of first pipes 111 and the first row of second pipes 121, if the hot air flow first flows through the first row of second pipes 121, then the hot air flow is cooled to a lower temperature after heat exchange with the first row of second pipes 121, and then passes through the first row of first pipes 111, it is easy to freeze the first row of first pipes 111, that is, if the hot air flow first flows through the first row of second pipes 121 and then flows through the first row of first pipes 111, it is easy to freeze the first row of first pipes 111 due to the lower air flow temperature; and if the hot air flow first flows through the first row of first pipes 111 and then flows through the first row of second pipes 121, since the hot air flow has a higher temperature when flowing through the first row of first pipes 111, it is not easy to freeze the first row of first pipes 111.

[0043] For the second row of first pipes 111 and the second row of second pipes 121, since the temperature of the coolant will increase after the first row of first pipes 111 and the hot air flow undergo heat exchange, the temperature of the coolant flowing into the second row of first pipes 111 will be relatively higher. Therefore, when the hot air flow first flows through the first row of first pipes 111 and the first row of second pipes 121 for heat exchange and cooling before flowing through the second row of first pipes 111, it is not easy to freeze the second row of first pipes 111. In this embodiment, the first pipes 111 and the second pipes 121 of each row are cross-distributed, and the first row of first pipes 111 is closer to the air inlet of the cabinet 10 than the first row of second pipes 121, thereby improving the heat exchange coefficient of the water coil and the fluorine coil and reducing the possibility of the pipes being frozen and cracked.

[0044] In this embodiment, the first pipe and the second pipe are each provided with 2 rows. It can be understood that in other embodiments, the first pipe may also be provided with 3 rows, 4 rows, 5 rows or more, and the second pipe may also be provided with 3 rows, 4 rows, 5 rows or more.

[0045] Continue to refer to Figure 1As shown, the dual cold source indoor unit also includes an air pipe 4, a first liquid pipe 5, a first pipeline 6, a second pipeline 7, an electronic expansion valve 8, a two-way valve 9 and a protective net. The air pipe 4 is connected to the output end of the fluorine coil 12, the first liquid pipe 5 is connected to the input end of the fluorine coil 12, the electronic expansion valve 8 is connected to the first liquid pipe 5 and is located in the cabinet 10, and is used to control the flow of the refrigerant flowing into the fluorine coil 12. The first pipeline 6 is connected to the input end of the water coil 11, the second pipeline 7 is connected to the output end of the water coil 11, and the two-way valve 9 is connected to the second pipeline 7 and is located in the cabinet 10, and is used to control the on-off of the second pipeline 7. The protective net is set at the air inlet of the cabinet 10, and the fan 13 is set at the air outlet of the cabinet 10, so that when the fan 13 is started, the indoor air can flow into the cabinet 10 from the protective net and then be discharged from the air outlet of the cabinet 10. The electronic expansion valve 8 is a throttling element that can adjust the refrigerant flow rate entering the refrigeration device according to a preset program, and can use the electrical signal generated by the adjusted parameter to control the voltage or current applied to the electronic expansion valve, thereby achieving the purpose of adjusting the liquid supply. The two-way valve 9 can be set as an electric two-way valve.

[0046] In this embodiment, the temperature and pressure of the fluorine coil can be kept stable by setting the electronic expansion valve 8, thereby ensuring the normal operation of the refrigeration system; the impurities in the air flowing into the cabinet 10 can be filtered out by setting the protective net, avoiding excessive dust, impurities, etc. from adhering to the fan 13, the water coil 11 and the fluorine coil 12 and affecting their normal operation.

[0047] In some embodiments, the electronic expansion valve 8 is disposed in the cabinet 10, and a plurality of electronic expansion valves 8 are provided, and the plurality of electronic expansion valves 8 are connected in parallel to the liquid pipe 5. Exemplarily, two electronic expansion valves 8 may be provided, and the two electronic expansion valves 8 are connected in parallel to the liquid pipe 5 and are located in the cabinet 10.

[0048] The output end of the chilled water outdoor unit 2 is detachably connected to the first pipeline 6, and the input end of the chilled water outdoor unit 2 is detachably connected to the second pipeline 7. The fluorine pump outdoor unit 3 includes a body, a fluorine pump 31, a condenser 32, a liquid storage tank 33 and a second liquid pipe 34. The fluorine pump 31, the condenser 32 and the liquid storage tank 33 are respectively installed in the body. The output end of the fluorine pump 31 is detachably connected to the first liquid pipe 5, the input end of the fluorine pump 31 is connected to the output end of the condenser 32 through the second liquid pipe 34, the input end of the condenser 32 is detachably connected to the air pipe 4, and the liquid storage tank 33 is connected to the input end of the fluorine pump 31. Among them, the condenser 32 is a component of the refrigeration system, which is used to convert gas or vapor into liquid and transfer the heat in the pipe to the air near the pipe in a very fast way; the liquid storage tank 33 is used to store refrigerant liquid to provide refrigerant for the fluorine pump outdoor unit 3. By providing a liquid storage tank in this embodiment, the refrigerant at the input end of the fluorine pump can be in liquid state, thereby avoiding damage to the fluorine pump or affecting the stable operation of the fluorine pump, thereby protecting the fluorine pump and increasing the service life of the fluorine pump.

[0049] In some embodiments, there are multiple dual-cold source indoor units 1, and each water coil 11 in the multiple dual-cold source indoor units 1 is detachably connected to the chilled water outdoor unit 2, and the fluorine coil 12 in the multiple dual-cold source indoor units 1 is detachably connected to the fluorine pump outdoor unit 3.

[0050] Reference Figure 3 As shown, exemplarily, there are four cabinets 10 arranged in parallel, each cabinet 10 is respectively installed with a water coil 11, a fluorine coil 12, a two-way valve 9 and two electronic expansion valves 8, the arrangement of the water coil 11 and the fluorine coil 12 in each cabinet 10 is the same as the above embodiment, and the connection method of the two-way valve 9 and each electronic expansion valve 8 is the same as the two-way valve 9 and the electronic expansion valve 8 in the above embodiment. This embodiment adopts a one-to-many detachable connection method, one outdoor unit can correspond to multiple indoor units that are combined in cabinets, which is convenient for disassembly and transportation, and at the same time, it responds to development quickly, saves costs, and facilitates convenient maintenance in the later stage. At the same time, multiple indoor units can be combined in cabinets according to the application environment, which increases the equipment adjustment capacity. In addition, through the setting of the two-way valve, it can be accurately adjusted automatically according to the load demand or hot spot load demand of the controlled water coil 11, and at the same time, the water flow rate can be adjusted according to the dew point temperature control to meet the design requirements of no condensation water, reducing the safety hazards of water entering the machine room.

[0051] In the case of a large demand for cooling capacity, the present application can directly use the existing indoor equipment in parallel layout or quickly develop indoor units with relatively small cooling capacity to arrange multiple indoor units in parallel to meet the demand, and can share the external unit circulation through a parallel solution to reduce the number of external units and save costs; during the actual use of the parallel layout of multiple indoor units, the number of indoor unit starts and stops can also be controlled according to logic to achieve cooling capacity adjustment under different demands; in later maintenance, simply maintaining the data of one indoor unit can meet the data maintenance of the entire equipment.

[0052] In actual application scenarios, when the outdoor temperature is in the second preset temperature range W2 (for example, 20°C ≥ W2>5°C), the unit uses the fluorine pump refrigeration mode and the chilled water refrigeration mode at the same time, the water coil 11 and the fluorine coil 12 are turned on at the same time, and the refrigerant in the fluorine pump refrigeration mode dissipates heat through the condenser 32, and then is pressurized by the fluorine pump 31, and then throttled and reduced in pressure expansion through the electronic expansion valve 8, and then flows into the fluorine coil 12. At this time, the refrigerant exchanges heat with the heat source in the fluorine coil 12 to cool the heat source. , the refrigerant absorbs heat through the fluorine coil 12, evaporates completely to become gaseous refrigerant, and the gaseous refrigerant then enters the condenser 32; when the chilled water cooling mode is performed at the same time, the two-way valve 9 connected to the second pipeline 7 adjusts the water flow rate according to the actual required cooling capacity, and the chilled water outdoor unit 2 transports the chilled water from the first pipeline 6 to the water coil 11, and the water coil 11 exchanges heat with the hot air or other heat source circulating in the machine room, and the chilled water that absorbs heat flows back to the chilled water outdoor unit 2 from the second pipeline 7, thereby completing the dual cold source cycle.

[0053] When the outdoor temperature is in the third preset temperature range W3 (for example, W3≤5°C), the fluorine pump refrigeration mode is used. At this time, the refrigerant in the fluorine pump refrigeration mode dissipates heat through the condenser 32, is pressurized by the fluorine pump 31, and then expands by throttling and reducing the pressure through the electronic expansion valve 8, and then absorbs heat through the fluorine coil 12, evaporates completely to become a gaseous refrigerant, and the gaseous refrigerant enters the condenser 32 to complete the refrigeration cycle.

[0054] When the outdoor temperature is within the first preset temperature range W1 (for example, W1>20°C), the unit automatically switches to the chilled water cooling mode. At this time, the two-way valve 9 connected to the second pipeline 7 can adjust the water flow rate according to the actual required cooling capacity. The chilled water outdoor unit 2 transports the chilled water from the first pipeline 6 to the water coil 11. The chilled water exchanges heat with the circulating hot air in the machine room or other heat sources in the water coil 11. The chilled water that absorbs heat flows back to the chilled water outdoor unit 2 from the second pipeline 7. This cycle is repeated to achieve the purpose of cooling. This operating mode reduces the energy consumption of the unit and reduces energy consumption costs.

[0055] This application adopts dual cold source cycle refrigeration, which is environmentally friendly and energy-saving. It adopts a one-to-many internal and external air-conditioning connection form. It can flexibly switch multiple cooling sections according to scene requirements, facilitate disassembly and transportation, and quickly respond to development, save costs, and facilitate convenient maintenance in the later stage.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A dual cold source indoor unit, characterized in that: include: A cabinet, wherein the cabinet is provided with an air inlet and an air outlet; A fan, wherein the fan is arranged in the cabinet; A water coil, the water coil is installed in the cabinet, and the water coil includes a plurality of first pipes that are interconnected, and the plurality of first pipes are arranged in a row to form a plurality of rows of the first pipes; and A fluorine coil, the fluorine coil is installed in the cabinet, and the fluorine coil comprises a plurality of second pipes that are interconnected, and the plurality of second pipes are arranged in a row to form a plurality of rows of second pipes; Wherein, along the direction from the air inlet to the outlet air, each column of the first pipes and each column of the second pipes are arranged alternately, and the first column of the first pipes is closer to the air inlet than the first column of the second pipes.

2. The dual cold source indoor unit according to claim 1, characterized in that: The inner wall of each of the first pipes is a smooth surface, and the inner wall of each of the second pipes is provided with threads.

3. The dual cold source indoor unit according to claim 1, characterized in that: The dual cold source indoor unit also includes a protective net, which is arranged at the air inlet, and the fan is arranged at the air outlet.

4. The dual cold source indoor unit according to claim 1, characterized in that: The dual cold source indoor unit also includes a first pipeline, a second pipeline and a two-way valve, the first pipeline is connected to the input end of the water coil, the second pipeline is connected to the output end of the water coil, and the two-way valve is connected to the second pipeline and is located in the cabinet.

5. The dual cold source indoor unit according to claim 1, characterized in that: The dual cold source indoor unit further comprises an air pipe and a first liquid pipe, wherein the air pipe is connected to the output end of the fluorine coil, and the first liquid pipe is connected to the input end of the fluorine coil.

6. The dual cold source indoor unit according to claim 5, characterized in that: The dual cold source indoor unit further includes a plurality of electronic expansion valves, which are connected in parallel to the first liquid pipe and are located in the cabinet.

7. A refrigeration unit, characterized in that: include: The dual cold source indoor unit according to any one of claims 1 to 6; A chilled water outdoor unit, the chilled water outdoor unit is detachably connected to the water coil and is used to provide cooling liquid to the water coil; A fluorine pump outdoor unit, which is detachably connected to the fluorine coil and is used to cool the refrigerant and then provide it to the fluorine coil; and A controller is connected to the chilled water outdoor unit, the fluorine pump outdoor unit and the dual cold source indoor unit respectively, and is used to control the operation of the chilled water outdoor unit, the fluorine pump outdoor unit and the dual cold source indoor unit according to the outdoor temperature, so that the water coil and / or the fluorine coil can exchange heat with the indoor air.

8. The refrigeration unit according to claim 7, characterized in that: The fluorine pump outdoor unit includes a body, a fluorine pump, a condenser and a second liquid pipe. The fluorine pump and the condenser are respectively installed in the body, and the output end of the fluorine pump is detachably connected to the input end of the fluorine coil. The input end of the fluorine pump is connected to the output end of the condenser through the second liquid pipe, and the input end of the condenser is detachably connected to the output end of the fluorine coil.

9. The refrigeration unit according to claim 8, characterized in that: The fluorine pump outdoor unit also includes a liquid storage tank, which is arranged in the machine body and connected to the input end of the fluorine pump.

10. The refrigeration unit according to claim 7, characterized in that: There are multiple dual-cold source indoor units, and each of the water coils in the multiple dual-cold source indoor units is detachably connected to the chilled water outdoor unit, and the fluorine coils in the multiple dual-cold source indoor units are detachably connected to the fluorine pump outdoor unit.

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