Refrigerating device for multi-temperature controlled cold storage

Abstract

The application relates to the technical field of cold storage equipment, and discloses a refrigerating device of a multi-temperature-control cold storage, which comprises an outdoor unit, an indoor unit, a shunt unit, a reflux unit and a control host; the outdoor unit comprises a variable-frequency compressor controlled by the control host; the indoor unit comprises at least two evaporators, each evaporator is provided with a temperature detection unit electrically connected to the control host; the output end of the shunt unit is provided with at least two shunt branch pipes, each shunt branch pipe is respectively provided with a flow regulating valve controlled by the control host; the output end of the outdoor unit is connected with the input end of the shunt unit, each shunt branch pipe is respectively connected with the input end of each evaporator of the indoor unit, and the output end of each evaporator of the indoor unit is connected with the input end of the outdoor unit through the reflux unit. The refrigerating device of the multi-temperature-control cold storage can meet the temperature requirements of various cold storages, and can reduce the energy consumption and use cost of the cold storage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cold storage equipment, in particular to a refrigeration device of a multi-temperature-control cold storage. BACKGROUND

[0002] The cold storage is a low-temperature refrigeration equipment, which is mainly used for constant-temperature storage of food, dairy products, meat, aquatic products, poultry, fruits and vegetables, cold drinks, medicines and the like, and the amount of stored frozen food is relatively large. Among them, the required storage temperature requirements of different storage products are different, for example, for the preservation of fruits and vegetables, the required storage temperature is usually-5℃ to 5℃; for the cold storage of frozen food, the required storage temperature is usually-10℃ to-5℃; for the cold storage of frozen aquatic products and poultry meat food, the required storage temperature is usually-20℃ to-10℃; for the rapid freezing before fresh product cold storage, the required storage temperature is usually below-23℃. Therefore, the cold storage should be set up according to the product category to be stored. Different temperature storage cold storage areas.

[0003] The refrigeration device can provide refrigeration capacity for the cold storage to realize the low-temperature storage environment of the cold storage, and is the core equipment of the cold storage construction. In order to realize different cold storage temperatures, corresponding refrigeration devices are usually set up in different cold storage areas, and each refrigeration device can independently operate according to the temperature requirements of each cold storage area, the refrigeration control does not interfere with each other, and the temperature regulation control accuracy of each cold storage area is high. However, the setting of multiple refrigeration devices increases the energy consumption of the cold storage, and the use cost of the cold storage is high. SUMMARY

[0004] In order to meet the temperature requirements of the cold storage and reduce the energy consumption and use cost of the cold storage, the present application provides a refrigeration device of a multi-temperature-control cold storage.

[0005] The refrigeration device of the multi-temperature-control cold storage provided by the present application adopts the following technical scheme:

[0006] The application relates to a refrigerating device of a multi-temperature-control cold storage, which comprises an outdoor unit, an indoor unit, a shunt unit, a reflux unit and a control host; the outdoor unit comprises a variable-frequency compressor and a condenser, the variable-frequency compressor is controlled by the control host, the exhaust port of the variable-frequency compressor is connected with the condensing cavity inlet of the condenser; the condensing cavity outlet of the condenser is connected with the input end of the shunt unit; the output end of the shunt unit is provided with at least two shunt branch pipes, each shunt branch pipe is provided with a flow regulating valve, and the flow regulating valve is controlled by the control host; the indoor unit comprises at least two evaporators, each evaporator is correspondingly provided with a temperature detection unit, and the temperature detection unit is electrically connected with the control host; the inlets of the evaporators are connected with the shunt branch pipes in one-to-one correspondence, and a throttling expansion valve is arranged on the connecting path of the evaporator and the shunt branch pipe; the input end of the reflux unit is provided with at least two reflux branch pipes, each reflux branch pipe is connected with the outlet of each evaporator in one-to-one correspondence; and the output end of the reflux unit is connected with the air inlet of the variable-frequency compressor.

[0007] In order to store different products, based on different storage temperature requirements of different products, the cold storage can be divided into different storage areas by using heat insulation structure design and the like. When the refrigerating device of the multi-temperature-control cold storage is applied to cold storage refrigeration, each evaporator of the indoor unit is respectively installed in each storage area, so as to respectively perform refrigeration for each storage area by each evaporator.

[0008] Taking the refrigeration cycle path of one evaporator as an example, the refrigeration process of the refrigerating device of the multi-temperature-control cold storage is as follows: the variable-frequency compressor in the outdoor unit compresses low-temperature and low-pressure gaseous refrigerant to generate high-temperature and high-pressure gaseous refrigerant; the high-temperature and high-pressure gaseous refrigerant generated by the variable-frequency compressor is transported into the condensing cavity of the condenser, low-temperature cooling liquid flows in the condenser, the low-temperature cooling liquid absorbs the temperature of the high-temperature and high-pressure gaseous refrigerant in the condensing cavity, the high-temperature and high-pressure gaseous refrigerant releases heat to be cooled to condense into medium-temperature and high-pressure liquid refrigerant and is discharged from the condensing cavity outlet of the condenser; the medium-temperature and high-pressure liquid refrigerant generated by the condenser is shunted by the shunt unit to flow into the connecting path of the evaporator which needs to perform refrigeration work, the medium-temperature and high-pressure liquid refrigerant is processed by the throttling expansion valve on the connecting path to be converted into low-temperature and low-pressure liquid refrigerant, the low-temperature and low-pressure liquid refrigerant flows to the evaporator, the heat absorption of the low-temperature and low-pressure liquid refrigerant flowing in the evaporator can cool the surrounding of the evaporator to achieve refrigeration, and the low-temperature and low-pressure liquid refrigerant is vaporized into low-temperature and low-pressure gaseous refrigerant after heat absorption; the low-temperature and low-pressure gaseous refrigerant output by the evaporator is transported back to the variable-frequency compressor after passing through the reflux unit, and the circulation is repeated to achieve refrigeration.

[0009] In the refrigeration process, the refrigeration device of the multi-temperature control cold storage can adjust the operating frequency of the variable frequency compressor through the control host, adjust the refrigerating capacity of the variable frequency compressor by adjusting the operating frequency of the variable frequency compressor, and control the opening and closing of the flow regulating valve on each shunt branch pipe of the shunt unit through the control host to control the on-off control or flow regulation of different shunt branch pipes to realize the opening and closing or refrigerating capacity regulation of the refrigeration cycle path operation of each evaporator. The control host adjusts the variable frequency compressor and the flow regulating valve according to the temperature detection feedback of the temperature detection unit arranged in each evaporator.

[0010] The control process of the refrigeration device of the multi-temperature control cold storage is as follows: the control host sets the required temperature of each storage area, the temperature detection unit of each evaporator can feed back the detected evaporator refrigeration temperature to the control host, and the control host judges whether the refrigeration temperature in the storage area corresponding to the detected evaporator reaches the pre-set required temperature according to the temperature feedback. If the temperature feedback of a certain evaporator exceeds the pre-set required temperature, the control host controls the opening and opening size of the flow regulating valve of the shunt branch pipe connected to the evaporator, opens the refrigeration cycle path of the evaporator, and adjusts the refrigerant flow of the shunt branch pipe. At the same time, the control host controls the variable frequency compressor to operate at the operating frequency matched with the required temperature of the evaporator, and when the temperature feedback of the temperature detection unit of the evaporator reaches the pre-set required temperature, the control host controls the flow regulating valve and the variable frequency compressor to be closed. In this way, the refrigeration requirements of each storage area are met.

[0011] Therefore, the refrigeration device of the multi-temperature control cold storage can realize the temperature control of each storage area through the control host without the need for additional multiple outdoor unit structures, the temperature control is accurate, and the manufacturing and use costs of the cold storage are reduced. Moreover, the variable frequency compressor adjusts the operating frequency appropriately, reduces the single operation mode of the compressor that can only output refrigerating capacity at the lowest temperature requirement, reduces the possibility of long-term full-load operation of the compressor, and reduces energy consumption. Moreover, when the variable frequency compressor adjusts the refrigerating capacity, the flow regulating valve on the shunt branch pipe can also be used to control the evaporator refrigerant flow, and the double flow regulation combination can reduce the instability of the evaporator flow distribution caused by the change of the variable frequency compressor discharge flow.

[0012] Optionally, a static mixing element is further arranged on the input end of the shunt unit, the input end of the static mixing element is connected with the outlet of the condensing cavity of the condenser, and the output end of the static mixing element is connected with each shunt branch pipe.

[0013] In the refrigeration process of the multi-temperature controlled cold storage refrigeration device, the refrigerant is converted from gas to liquid by the condenser for the evaporator refrigeration. In the actual refrigeration process, the refrigerant discharged from the condenser is substantially mixed with the gaseous refrigerant that has not been condensed, that is, the refrigerant discharged from the condenser is in a gas-liquid mixed state dominated by liquid, which is called two-phase refrigerant. During the flow process, the gas-liquid two-phase will naturally separate, which will cause unequal distribution of refrigerant to different branches. The decline in evaporation heat exchange efficiency caused by uneven distribution of refrigerant can be as high as 25%, especially the distribution of liquid refrigerant has a greater impact on evaporation heat exchange performance. The multi-temperature controlled cold storage refrigeration device needs to be divided twice in the refrigeration process, one is the distribution of the distribution unit, such as when each evaporator is refrigerated at the same required temperature, each distribution branch pipe is opened at the same time, and the two-phase refrigerant is distributed to each evaporator through the distribution unit; the other is the distribution of the refrigerant in the evaporator itself, because the evaporator is evaporated by setting multiple evaporating pipes, the two-phase refrigerant needs to be distributed to each evaporating pipe for the refrigeration of the evaporator. Therefore, improving the gas-liquid mixing uniformity of the two-phase refrigerant discharged from the condenser is beneficial to improving the heat exchange efficiency of the multi-temperature controlled cold storage refrigeration device.

[0014] Therefore, the multi-temperature controlled cold storage refrigeration device in the present application is provided with a static mixing element on the input end of the distribution unit. The two-phase refrigerant is mixed with the aid of the static mixing element, which can improve the gas-liquid mixing uniformity. The distribution uniformity of the two-phase refrigerant after the mixing uniformity treatment can be improved, thereby improving the refrigeration effect and being beneficial to the rapid adjustment of the temperature of the cold storage.

[0015] Optionally, the static mixing element comprises a shell, a flow guide plate and a baffle, the shell is internally provided with a flow channel, the flow guide plate is arranged in the flow channel, one side of the flow guide plate facing the inlet end of the flow channel is provided with an arch portion, the circumferential side of the arch portion forms a flow guide side groove with the inner wall of the flow channel, a plurality of flow guide through holes are arranged on the plate surface of the flow guide plate and located on the circumferential side of the arch portion, and the flow guide through holes are in communication with the flow guide side groove; the baffle is arranged in the flow channel, the baffle is located on the side of the flow guide plate away from the inlet end of the flow channel, a baffle through hole is arranged on the baffle, the baffle through hole is arranged in a staggered manner with the flow guide through hole, and the baffle through hole is in communication with the outlet end of the flow channel.

[0016] When the two-phase refrigerant passes through the static mixing element, the two-phase refrigerant is dispersed along the circumferential side of the arch portion of the guide plate, and then flows out through the guide passage of the guide plate and is blocked by the plate surface of the baffle. The plate surface of the baffle causes part of the two-phase refrigerant to flow to the baffle hole for output. Because the two-phase refrigerant has been dispersed to the four directions by the arch portion of the guide plate, the two-phase refrigerant is collected from the circumferential side to the baffle hole for flow output at the baffle. The two-phase refrigerant collides and mixes, improving the mixing uniformity. Part of the two-phase refrigerant is intercepted by the baffle and flows back to the guide plate. The two-phase refrigerant is intercepted and divided by the guide plate. Part of the two-phase refrigerant flows upward and mixes with the two-phase refrigerant above the guide plate and then flows to the baffle. Part of the two-phase refrigerant flows downward and mixes with the two-phase refrigerant below the guide plate and then flows to the baffle. The two-phase refrigerant is circulated and mixed between the guide plate and the baffle for flow output, improving the turbulence effect and increasing the probability of molecular collision and mixing of the two-phase refrigerant, thereby improving the gas-liquid mixing uniformity and the distribution uniformity of the two-phase refrigerant.

[0017] Optionally, the baffle is provided with a conical protrusion facing the plate surface of the guide plate, and the baffle hole penetrates the central axis position of the conical protrusion, and the necked end of the conical protrusion faces the guide plate.

[0018] The baffle is provided with a conical protrusion, and a mixing chamber with a triangular cross section is formed between the guide plate, the circumferential taper surface of the conical protrusion, and the inner wall of the flow channel. The circumferential taper surface of the conical protrusion guides the two-phase refrigerant to flow to the guide plate, improving the backflow effect of the two-phase refrigerant flowing to the guide plate. The two-phase refrigerant flowing out of the baffle hole is mostly mixed in the mixing chamber, improving the gas-liquid mixing uniformity and the distribution uniformity of the two-phase refrigerant.

[0019] Optionally, the circumferential side surface of the conical protrusion is a concave curved surface that is recessed toward the central axis.

[0020] The circumferential side surface of the conical protrusion of the baffle is a concave curved surface. Under the combined action of the interception and backflow of the baffle, the continuous flow of the two-phase refrigerant, and the guiding action of the concave curved surface, the two-phase refrigerant forms a spiral backflow state toward the guide plate at the circumferential side of the conical protrusion. The two-phase refrigerant is then dispersed by the guide plate and flows out of the baffle hole, further improving the gas-liquid mixing effect.

[0021] Optionally, one side of the arch portion away from the inlet end of the flow channel is formed with an arc-shaped groove, and the arc-shaped groove is arranged in front of the baffle hole.

[0022] The arc-shaped groove is arranged on the guide plate, so that the two-phase refrigerant intercepted by the baffle is mostly concentrated in the arc-shaped groove of the guide plate for gas-liquid mixing, and the arc-shaped groove is arranged in front of the through hole of the baffle, so that the mixing area of the gas-liquid mixing is located in front of the through hole of the baffle, and the two-phase refrigerant in the mixing area can accurately and quickly pass through the through hole of the baffle to be output, thereby improving the gas-liquid mixing effect, reducing the flow loss caused by the residence of the two-phase refrigerant around the through hole of the baffle, and achieving the comprehensive effect of gas-liquid mixing and rapid flow.

[0023] Optionally, the arched surface of the arch portion towards the inlet end of the flow channel is a conical protruding surface or a hemispherical protruding surface.

[0024] The arch portion is provided with a conical protruding surface or a hemispherical protruding surface, which can improve the uniformity of the dispersion of the two-phase refrigerant.

[0025] Optionally, a center hole is arranged through the arch portion, and the center hole is coaxially arranged with the through hole of the baffle.

[0026] The arch portion is provided with a center hole, and the center hole and the through hole of the baffle are coaxially arranged, so that the flow path in the flow channel at the coaxial position of the center hole and the through hole of the baffle is not intercepted by the guide plate and the baffle, and part of the two-phase refrigerant directly passes through the guide plate and flows out from the through hole of the baffle. This part of the two-phase refrigerant can be referred to as a center flow beam. The rapid flow of the center flow beam forms a direct pushing force between the guide plate and the baffle. The center flow beam drives the two-phase refrigerant flowing around the through hole of the baffle to flow out from the through hole of the baffle, thereby improving the uniformity of gas-liquid mixing, improving the flow efficiency of the two-phase refrigerant, and reducing the mixing residence phenomenon.

[0027] Optionally, the diameter of the flow channel increases and then decreases along the axial direction, and the inner wall of the flow channel is a curved surface along the axial cross section.

[0028] By adopting the above technical solution, the flow chamber of the flow channel has a spherical structure as a whole, which can improve the mixing capacity of the two-phase refrigerant therein. The inner wall of the flow channel and the arch portion of the guide plate form a guide side groove, and the two-phase refrigerant flowing out through the guide side groove and the guide opening can flow along the curved surface of the inner wall of the flow channel under the action of inertia, thereby improving the overturning mixing of the two-phase refrigerant and helping to improve the turbulent effect of the two-phase refrigerant.

[0029] Optionally, the guide plate is arranged at the position with the largest diameter of the flow channel, and the arch portion is arched to the inlet end of the flow channel.

[0030] By adopting the above technical scheme, the flow length of the flow guide side groove formed between the flow channel and the supply part is prolonged, the dispersion range of the two-phase refrigerant in the flow guide side groove is increased, the dispersion resistance is improved, the dispersion effect is improved, which helps the two-phase refrigerant to pass through the flow guide through hole on the flow guide plate uniformly and quickly, reduces the blocking phenomenon of the two-phase refrigerant at the flow guide through hole, and the two-phase refrigerant after dispersion is mixed between the flow guide plate and the baffle, the mixing and dispersion uniformity is high, and the gas-liquid mixing uniformity is improved.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. The refrigeration device of the multi-temperature controlled cold storage can realize temperature control of each storage area without additional outdoor unit structure, and the temperature control is accurate, which reduces the manufacturing and use cost of the cold storage. Moreover, the frequency of the variable frequency compressor is adjusted, which reduces the single operation mode of the compressor only outputting refrigeration capacity at the lowest temperature requirement, reduces the possibility of long-term full-load operation of the compressor, and reduces energy consumption. The static mixing element is arranged on the input end of the flow dividing unit, the two-phase refrigerant is mixed with the aid of the static mixing element, the gas-liquid mixing uniformity is improved, the distribution uniformity of the two-phase refrigerant after mixing is improved, and the refrigeration effect is improved, which is beneficial to rapid adjustment of the temperature of the cold storage.

[0033] 2. The mixing area of the static mixing element is located in front of the baffle through hole, so that the two-phase refrigerant in the mixing area can pass through the baffle through hole to output under the continuous pushing of the flow effect, which improves the gas-liquid mixing effect and reduces the flow efficiency loss caused by the retention of the two-phase refrigerant on the side of the baffle through hole, and has the comprehensive effect of gas-liquid mixing and rapid flow. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a structural principle block diagram of embodiment 1 of the present application.

[0035] Figure 2 is a structural principle block diagram of embodiment 2 of the present application.

[0036] Figure 3 is a cross-sectional structure schematic diagram of the static mixing element of embodiment 2 of the present application.

[0037] Figure 4 is a cross-sectional structure schematic diagram of the static mixing element of embodiment 3 of the present application.

[0038] Figure 5 is a cross-sectional structure schematic diagram of the static mixing element of embodiment 4 of the present application.

[0039] Figure 6 is a cross-sectional structure schematic diagram of the static mixing element of Embodiment 5 of the present application.

[0040] Reference signs: 1, variable frequency compressor; 2, condenser; 3, shunt unit; 4, first flow regulating valve; 5, second flow regulating valve; 6, throttling expansion valve; 7, first evaporator; 8, second evaporator; 9, reflux unit; 10, static mixing element; 11, shell; 12, flow conversion channel; 13, connecting end cover; 14, shunt connecting head; 15, flow guide plate; 151, arch part; 152, flow guide opening; 153, arc-shaped groove; 154, center hole; 16, baffle; 161, conical protrusion; 162, baffle through hole. DETAILED DESCRIPTION

[0041] The following will be described in detail with reference to the accompanying drawings. Figures 1-6 The present application will be further described in detail.

[0042] Embodiments of the present application disclose a refrigerating device of a multi-temperature-control cold storage.

[0043] Embodiment 1

[0044] The refrigerating device of the multi-temperature-control cold storage is used for refrigeration control of different storage areas of the cold storage. The storage areas of the cold storage can be divided and constructed according to the temperature requirements of the products to be stored. In order to facilitate the description and understanding of the embodiments of the present application, the cold storage is divided into two storage areas, i.e., a refrigeration area and a freezing area in the embodiments of the present application, wherein the storage temperature of the refrigeration area is set to -5℃ to 5℃, and the storage temperature of the freezing area is set to -20℃ to -10℃.

[0045] Reference Figure 1 The refrigerating device of the multi-temperature-control cold storage comprises an outdoor unit, an indoor unit, a shunt unit 3, a reflux unit 9 and a control host.

[0046] The outdoor unit comprises a variable frequency compressor 1 and a condenser 2. The variable frequency compressor 1 is controlled by the control host. The exhaust port of the variable frequency compressor 1 is connected with the condensing cavity inlet of the condenser 2. The condensing cavity outlet of the condenser 2 is connected with the input end of the shunt unit 3.

[0047] The output end of the shunt unit 3 is provided with a first shunt branch pipe and a second shunt branch pipe. The first flow regulating valve 4 is arranged on the first shunt branch pipe, and the second flow regulating valve 5 is arranged on the second shunt branch pipe. The first flow regulating valve 4 and the second flow regulating valve 5 are respectively controlled by the control host.

[0048] The indoor unit comprises a first evaporator 7 installed in the refrigeration area of the freezer and a second evaporator 8 installed in the freezing area of the freezer, the first evaporator 7 is provided with a first temperature detection unit capable of detecting the refrigeration temperature of the first evaporator 7 to correspondingly detect the temperature of the refrigeration area of the freezer, the second evaporator 8 is provided with a second temperature detection unit capable of detecting the refrigeration temperature of the second evaporator 8 to correspondingly detect the temperature of the freezing area of the freezer, the first temperature detection unit and the second temperature detection unit are electrically connected with the control host, the inlet of the first evaporator 7 is connected with the first shunt branch pipe, and the connection path of the first evaporator 7 and the first shunt branch pipe is provided with a throttling expansion valve 6, the inlet of the second evaporator 8 is connected with the second shunt branch pipe, and the connection path of the second evaporator 8 and the second shunt branch pipe is also provided with a throttling expansion valve 6.

[0049] The input end of the reflux unit 9 is provided with a first reflux branch pipe connected with the outlet of the first evaporator 7 and a second reflux branch pipe connected with the outlet of the second evaporator 8, and the output end of the reflux unit 9 is connected with the air inlet of the variable frequency compressor 1.

[0050] A control method of a refrigeration device of a multi-temperature control freezer, in particular:

[0051] The control host sets the storage temperature required by the refrigeration area and the freezing area, sets the storage temperature of the refrigeration area to-5℃ to 5℃, and sets the storage temperature of the freezing area to-20℃ to-10℃, sets the operation mode of the variable frequency compressor 1 according to the storage temperature requirements of the refrigeration area and the freezing area, specifically, the low-frequency operation mode of the variable frequency compressor 1 corresponding to the required storage temperature of the refrigeration area, and the high-frequency operation mode of the variable frequency compressor 1 corresponding to the required storage temperature of the freezing area, wherein the low-frequency operation mode corresponds to a frequency of 10-25HZ, and the high-frequency operation mode corresponds to a frequency of 25-50HZ.

[0052] The first temperature detection unit monitors the refrigeration temperature of the refrigeration area in real time and feeds back to the control host, and the second temperature detection unit monitors the refrigeration temperature of the freezing area in real time and feeds back to the control host.

[0053] The control host compares and judges whether the temperature fed back by the first temperature detection unit is within the pre-set refrigeration temperature range of the refrigeration area, and compares and judges whether the temperature fed back by the second temperature detection unit is within the pre-set refrigeration temperature range of the freezing area.

[0054] If the temperature fed back by the first temperature detection unit is within the refrigeration temperature range of the refrigeration area, and the temperature fed back by the second temperature detection unit is within the refrigeration temperature range of the freezing area, it indicates that the refrigeration area and the freezing area both have no refrigeration requirement.

[0055] If the temperature fed back by the first temperature detecting unit is not within the storage temperature range of the refrigeration area, and the temperature fed back by the second temperature detecting unit is within the storage temperature range of the freezing area, it indicates that the refrigeration area has refrigeration demand, and the freezing area has no refrigeration demand. At this time, the control host controls the first flow regulating valve 4 to open, the second flow regulating valve 5 to close, and the variable frequency compressor 1 to start operating in the low frequency operation mode. The circulating path of the refrigerant is: variable frequency compressor 1→condenser 2→splitting unit 3, first splitting branch pipe→throttling expansion valve 6→first evaporator 7→(back to) variable frequency compressor 1. The first evaporator 7 performs refrigeration on the refrigeration area until the pre-set storage temperature of the refrigeration area is reached, and the control host closes the variable frequency compressor 1 and the first flow regulating valve 4.

[0056] If the temperature fed back by the first temperature detecting unit is within the storage temperature range of the refrigeration area, and the temperature fed back by the second temperature detecting unit is not within the storage temperature range of the freezing area, it indicates that the refrigeration area has no refrigeration demand, and the freezing area has refrigeration demand. At this time, the control host controls the first flow regulating valve 4 to close, the second flow regulating valve 5 to open, and the variable frequency compressor 1 to start operating in the high frequency operation mode. The circulating path of the refrigerant is: variable frequency compressor 1→condenser 2→splitting unit 3, second splitting branch pipe→throttling expansion valve 6→second evaporator 8→(back to) variable frequency compressor 1. The second evaporator 8 performs refrigeration on the freezing area until the pre-set storage temperature of the freezing area is reached, and the control host closes the variable frequency compressor 1 and the second flow regulating valve 5.

[0057] If the temperature fed back by the first temperature detecting unit is not within the storage temperature range of the refrigeration area, and the temperature fed back by the second temperature detecting unit is not within the storage temperature range of the freezing area, it indicates that the refrigeration area has refrigeration demand, and the freezing area also has refrigeration demand. At this time, the control host prioritizes the refrigeration demand of the freezing area, first performs refrigeration on the freezing area, and then performs refrigeration on the refrigeration area after the refrigeration of the freezing area reaches the pre-set storage temperature. Since the variable frequency compressor 1 is switched from the high frequency mode corresponding to the refrigeration of the freezing area to the low frequency mode corresponding to the refrigeration of the refrigeration area, the discharge flow of the variable frequency compressor 1 fluctuates, which easily causes the refrigerant distribution at the evaporator to be unstable. Uneven distribution of the refrigerant reduces the evaporative heat exchange efficiency. At this time, the control host can adjust the refrigerant flow of the first flow regulating valve 4 to stabilize the refrigeration state at the evaporator.

[0058] Therefore, the refrigeration device of the multi-temperature controlled cold storage can realize temperature joint control of each storage area without additional multiple outdoor unit structures, has accurate temperature control, and reduces the manufacturing and use costs of the cold storage. Moreover, the variable frequency compressor 1 adjusts the operation frequency appropriately, reduces the single operation mode in which the compressor can only output refrigeration capacity in the lowest temperature demand mode, reduces the possibility of long-term full-load operation of the compressor, and reduces energy consumption.

[0059] Embodiment 2

[0060] With reference to Figure 2 The difference between the present embodiment and Embodiment 1 is that the refrigerating device of the multi-temperature controlled refrigerator of Embodiment 2 is provided with a static mixing element 10 at the input end of the flow distribution unit 3. The input end of the static mixing element 10 is connected with the outlet of the condensing cavity of the condenser 2 through a connecting pipe, and the output end of the static mixing element 10 is connected with each flow distribution branch pipe respectively.

[0061] With reference to Figure 3 The static mixing element 10 comprises a shell 11 which is a tubular shell 11, and a flow turning channel 12 is axially provided in the shell 11. One end of the flow turning channel 12 serves as an inlet, and the other end serves as an outlet. A connecting end cover 13 is provided on the inlet of the flow turning channel 12 of the shell 11. The connecting end cover 13 is fixedly installed on the shell 11 by fasteners, and an end cover connecting pipe is provided on the connecting end cover 13 and communicates with the inlet of the flow turning channel 12. The connecting pipe is inserted into the end cover connecting pipe to connect the static mixing element 10 with the condenser 2. A flow distribution connector 14 is provided on the outlet of the flow turning channel 12 of the shell 11. The flow distribution connector 14 is fixedly installed on the shell 11 by fasteners, and a plurality of flow distribution ports are provided on the flow distribution connector 14 and communicate with the outlet of the flow turning channel 12 respectively. Each flow distribution branch pipe is inserted into each flow distribution port to connect the static mixing element 10 with each flow distribution branch pipe.

[0062] With reference to Figure 3 The static mixing element 10 further comprises a flow guide plate 15 which is installed in the flow turning channel 12 of the shell 11. An arching portion 151 is provided on the side of the flow guide plate 15 facing the inlet of the flow turning channel 12. The arching surface of the arching portion 151 is a tapered convex surface. A flow guide side groove is formed between the arching portion 151 and the inner wall of the flow turning channel 12. A plurality of flow guide through openings 152 are provided on the plate surface of the flow guide plate 15 and located on the circumferential side of the arching portion 151.

[0063] With reference to Figure 3 The static mixing element 10 further comprises a baffle plate 16 which is installed in the flow turning channel 12 of the shell 11 and located on the side of the flow guide plate 15 away from the inlet of the flow turning channel 12. A tapered convex portion 161 is provided on the plate surface of the baffle plate 16 facing the flow guide plate 15. The tapered convex portion 161 has a tapered convex portion end portion which faces the flow guide plate 15. A baffle plate through hole 162 is provided on the baffle plate 16 and located on the central axis of the tapered convex portion 161. The baffle plate through hole 162 axially penetrates the baffle plate 16. The baffle plate through hole 162 is located away from the flow guide through opening 152.

[0064] With reference to Figure 3The refrigerant discharged from the condenser 2 is mainly in liquid state and mixed with a part of gaseous two-phase refrigerant, which enters the flow channel 12 through the end cover pipe. The flow channel 12 is sequentially provided with the flow guide plate 15 and the baffle plate 16 along the flow direction of the refrigerant. In the flow channel 12, the two-phase refrigerant is dispersed along the circumferential side of the arch part 151 of the flow guide plate 15, and then flows out through the flow guide opening 152 of the flow guide plate 15 and is blocked by the plate surface of the baffle plate 16. The baffle plate 16 is provided with a conical protrusion 161. The circumferential conical surface of the conical protrusion 161, the flow guide plate 15, and the inner wall of the flow channel 12 form a mixing chamber with a triangular cross section. The circumferential conical surface of the conical protrusion 161 guides the two-phase refrigerant to flow back to the flow guide plate 15. The flow guide plate 15 intercepts and divides the two-phase refrigerant, part of which flows upward and mixes with the two-phase refrigerant above and then flows to the baffle plate 16, and part of which flows downward and mixes with the two-phase refrigerant below and then flows to the baffle plate 16. Such circulation and mixing between the flow guide plate 15 and the baffle plate 16 improves the turbulence effect of the flow and increases the probability of molecular collision and mixing of the two-phase refrigerant, thereby improving the uniformity of the gas-liquid mixing and the uniformity of the distribution of the two-phase refrigerant. With the continuous flow of the mixed two-phase refrigerant in the flow channel, the mixed two-phase refrigerant flows out through the baffle plate hole 162 and then flows into the corresponding branch pipe through the branch port of the branch connection head 14.

[0065] It should be noted that in other embodiments, the static mixing element 10 can also be arranged between the throttling expansion valve 6 and the evaporator. The two-phase refrigerant output by the throttling expansion valve 6 is mixed by the static mixing element 10 before being input into the evaporator, which is beneficial to further optimizing the heat exchange efficiency of the evaporator.

[0066] Embodiment 3

[0067] With reference to Figure 4 The difference between this embodiment and embodiment 2 is that in the static mixing element 10 of embodiment 3, one side of the arch part 151 away from the inlet end of the flow channel 12 is formed with an arc-shaped groove 153, and the arc-shaped groove 153 is arranged in front of the baffle plate hole 162.

[0068] The implementation principle of example 3 is the same as that of example 2. More preferably, the deflector 15 of example 3 is provided with an arc-shaped groove 153, so that the two-phase refrigerant intercepted by the baffle 16 is mostly concentrated in the arc-shaped groove 153 of the deflector 15 for gas-liquid mixing, and at the same time, the arc-shaped groove 153 is arranged in front of the baffle through hole 162, so that the mixing area of gas-liquid mixing is located in front of the baffle through hole 162, and the two-phase refrigerant in the mixing area can accurately and quickly pass through the baffle through hole 162 for output under the continuous pushing of the flow effect, thereby improving the gas-liquid mixing effect, reducing the flow loss caused by the residence of the two-phase refrigerant on the side of the baffle through hole 162, and achieving the comprehensive effect of gas-liquid mixing and rapid flow.

[0069] Example 4

[0070] Referring to Figure 5 The difference between the present embodiment and example 3 is that in the static mixing element 10 of example 4, the shell 11 is a spherical shell 11, and the diameter of the flow channel 12 in the shell 11 increases and then decreases along the refrigerant flow direction, and the side wall of the flow channel 12 is a curved side wall along the cross section of the refrigerant flow direction.

[0071] The deflector 15 is arranged at the maximum diameter of the flow channel 12, and the arch part 151 arches to the inlet end of the flow channel 12. Moreover, the arch surface of the arch part 151 towards the inlet end of the flow channel 12 is a hemispherical convex surface.

[0072] The circumferential side surface of the conical protrusion 161 of the baffle 16 is arranged as a concave curved surface close to the center axis direction.

[0073] The implementation principle of example 4 is the same as that of example 3. More preferably, in example 4, the side wall of the flow channel 12 extending along the refrigerant flow direction is arranged as a variable-diameter curved surface, the arch part 151 of the deflector 15 is arranged as a spherical curved surface, and the circumferential side surface of the conical protrusion 161 of the baffle 16 is arranged as a concave curved surface, so that the multiple curved surfaces guide the flow, which can improve the rotation and overturning effect during the flow of the two-phase refrigerant, improve the turbulent effect of the two-phase refrigerant, and improve the uniformity of gas-liquid mixing.

[0074] Example 5

[0075] Referring to Figure 5 The difference between the present embodiment and example 4 is that in the static mixing element 10 of example 5, the arch part 151 is provided with a center hole 154, and the center hole 154 is coaxially arranged with the baffle through hole 162.

[0076] The implementation principle of example 5 is the same as that of example 4. More preferably, the arch part 151 of example 5 is provided with a central hole 154, and the central hole 154 and the baffle hole 162 are coaxially arranged, so that the flow path in the flow channel 12 at the coaxial position of the central hole 154 and the baffle hole 162 is not intercepted by the guide vane 15 and the baffle 16, and part of the two-phase refrigerant will directly pass through the guide vane 15 and quickly flow out of the baffle hole 162. This part of the two-phase refrigerant can be called a central flow beam. The rapid flow of the central flow beam acts between the guide vane 15 and the baffle 16 to form a straight flow pushing force towards the baffle hole 162. The central flow beam will drive the two-phase refrigerant flowing around the baffle hole 162 to be output from the baffle hole 162, thereby improving the flow efficiency of the two-phase refrigerant under the condition of improving the uniformity of the gas-liquid mixture, and reducing the mixing stagnation phenomenon.

[0077] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made in terms of structure, shape, principle, etc. of the present application should be covered within the protection scope of the present application.

Claims

1. A refrigeration apparatus for a multi-temperature controlled cold storage, characterized by: The air conditioner comprises an outdoor unit, an indoor unit, a flow splitting unit (3), a flow returning unit (9) and a control host; The outdoor unit comprises a variable frequency compressor (1) and a condenser (2), the variable frequency compressor (1) is controlled by the control host, the exhaust port of the variable frequency compressor (1) is connected with the condensing cavity inlet of the condenser (2), and the condensing cavity outlet of the condenser (2) is connected with the input end of the flow splitting unit (3); The output end of the flow splitting unit (3) is provided with at least two flow splitting branch pipes, each flow splitting branch pipe is provided with a flow regulating valve, and the flow regulating valve is controlled by the control host; The indoor unit comprises at least two evaporators, each evaporator is provided with a temperature detection unit in a one-to-one correspondence, the temperature detection unit is electrically connected with the control host, the inlet of each evaporator is connected with each flow splitting branch pipe in a one-to-one correspondence, and a throttling expansion valve (6) is further arranged on the connecting path of the evaporator and the flow splitting branch pipe; The input end of the flow returning unit (9) is provided with at least two flow returning branch pipes, each flow returning branch pipe is connected with the outlet of each evaporator in a one-to-one correspondence, and the output end of the flow returning unit (9) is connected with the air inlet of the variable frequency compressor (1); The input end of the flow splitting unit (3) is further provided with a static mixing element (10), the input end of the static mixing element (10) is connected with the condensing cavity outlet of the condenser (2), and the output end of the static mixing element (10) is connected with each flow splitting branch pipe; The static mixing element (10) comprises a shell (11), a flow guide plate (15) and a baffle (16), the shell (11) is internally provided with a flow conversion channel (12), the flow guide plate (15) is arranged in the flow conversion channel (12), one side of the flow guide plate (15) facing the inlet end of the flow conversion channel (12) is provided with an arch portion (151), the circumferential side of the arch portion (151) and the inner wall of the flow conversion channel (12) form a flow guide side groove, a plurality of flow guide through openings (152) are arranged on the plate surface of the flow guide plate (15) and located at the circumferential side of the arch portion (151) and penetrate the plate surface, the flow guide through openings (152) are in communication with the flow guide side groove, the baffle (16) is arranged in the flow conversion channel (12), the baffle (16) is located on the side of the flow guide plate (15) away from the inlet end of the flow conversion channel (12), a baffle through hole (162) is arranged on the baffle (16) and penetrates the baffle (16), the baffle through hole (162) is arranged in a staggered manner with the flow guide through openings (152), and the baffle through hole (162) is in communication with the outlet end of the flow conversion channel (12). The arch part (151) is a hemispherical convex surface towards the arch surface of the flow conversion channel (12) inlet end, the diameter of the flow conversion channel (12) increases and then decreases along the axial direction, the inner wall of the flow conversion channel (12) is a curved surface along the axial cross section; the flow guide plate (15) is arranged at the maximum diameter of the flow conversion channel (12), the arch part (151) arches to the inlet end of the flow conversion channel (12); the circumferential side of the arch part (151) and the inner wall of the flow conversion channel (12) form a U-shaped flow guide side groove; The baffle (16) is provided with a conical protrusion (161) towards the plate surface of the flow guide plate (15), the baffle through hole (162) penetrates the center axis position of the conical protrusion (161), and the necked end of the conical protrusion (161) is towards the flow guide plate (15); The circumferential side of the conical protrusion (161) is a concave curved surface close to the center axis direction; The side of the arch part (151) away from the inlet end of the flow conversion channel (12) is formed with an arc-shaped groove (153), and the arc-shaped groove (153) is arranged in front of the baffle through hole (162).

2. The multi-temperature controlled cold storage room refrigerating apparatus according to claim 1, characterized by: The arch part (151) is provided with a center hole (154) penetrating therethrough, and the center hole (154) is coaxially arranged with the baffle through hole (162).

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