CN106568275A - Multi-temperature-area double-flowing-way refrigeration device - Google Patents

Abstract

The present invention provides a refrigeration device with multiple temperature zones and dual flow paths, which includes a dual refrigeration system, a fan, an outdoor cabinet, and multiple indoor lockers; the first condenser in the dual refrigeration system is connected to the first gas-liquid separator; the second A gas-liquid separator is connected to the first heat exchanger, the first heat exchanger is connected to the second evaporator, the first gas-liquid separator is connected to the first evaporator, and the first evaporator is connected to the first heat exchanger, The second evaporator and the first heat exchanger are respectively connected to the first compressor through the third heat exchanger; the first heat regenerator is provided with a third capillary tube and a first heat return pipe for mutual heat exchange, and the second regenerator The fourth capillary tube and the second heat return pipe for mutual heat exchange are arranged in the middle, the heat exchange channel 2 of the second heat exchanger is connected with the second heat return pipe through the first heat return pipe, and the outlet of the fourth evaporator is connected with the second heat return pipe , the second return heat pipe is connected to the inlet of the second compressor. Achieve improved energy utilization and refrigeration performance, and expand the refrigeration temperature range to improve versatility.

Description

Multi-temperature zone dual-channel refrigeration device

technical field

The invention relates to refrigeration equipment, in particular to a refrigeration device with multiple temperature zones and double flow paths.

Background technique

At present, refrigeration equipment (refrigerators, freezers, etc.) are widely used in people's daily life. With the continuous improvement of people's living standards, people have higher and higher requirements for food and refrigeration equipment in terms of environmental protection, energy saving, and freshness preservation. Food storage requirements, wine needs to be stored in the temperature zone of 5~20℃, fruits and vegetables should be stored in the temperature zone of 0~8℃, ordinary meat, fish and other products need to be stored in -18℃, and some Special foods need to be stored at ultra-low temperatures. For example, tuna needs to be stored in an environment around -55°C to ensure the deliciousness of its meat. In the prior art, refrigeration equipment with multi-temperature zone refrigeration function usually adopts cooling capacity distribution and corresponding electronic control strategy to realize multi-temperature zone refrigeration, but in the actual use process, the multi-temperature zone in the prior art On the one hand, the refrigeration equipment increases the heat transfer temperature and the energy utilization rate is low. On the other hand, the control system is cumbersome. During the user's use, it is easy to have a problem of cooling difference or even no cooling at a certain temperature; more importantly, different temperature zones cannot be used. Realize refrigeration with large temperature difference, and the refrigeration temperature range is small. How to design a multi-temperature zone refrigeration equipment with high energy utilization rate, large refrigeration temperature range, and strong versatility is the technical problem to be solved by the present invention.

Contents of the invention

The technical problem to be solved by the present invention is to provide a multi-temperature zone dual-flow path refrigeration device, to achieve high energy utilization and refrigeration performance of the multi-temperature zone dual-flow path refrigeration device, and to expand the refrigeration temperature range to improve versatility.

The technical solution provided by the present invention is a multi-temperature zone dual-flow refrigeration device, including a dual refrigeration system, a fan, an outdoor cabinet, and a plurality of independent indoor lockers; the dual refrigeration system includes a first compressor, a second Two compressors, the first evaporator, the second evaporator, the third evaporator, the fourth evaporator, the first gas-liquid separator, the second gas-liquid separator, the first heat exchanger, the second heat exchanger, The third heat exchanger, the first condenser, the second condenser, the first regenerator and the second regenerator; the first compressor, the second compressor, the first condenser, the The second condenser, the first fan and the second fan are arranged in the outdoor casing, and the indoor locker is provided with an air supply channel, and the air supply channel is provided with an air inlet and an air outlet , the air supply channel is provided with a circulation fan, and the first evaporator, the second evaporator, the third evaporator, and the fourth evaporator are provided in the corresponding air supply channel of the indoor locker The inlet of the first evaporator is connected with a first capillary, the inlet of the second evaporator is connected with a second capillary, and the outlet of the first condenser is connected with the inlet of the first gas-liquid separator; The gas outlet of the first gas-liquid separator is connected to the heat exchange channel of the first heat exchanger, and the heat exchange channel of the first heat exchanger is connected to the second evaporation channel through the second capillary tube. The outlet of the first gas-liquid separator is connected to the first evaporator through the first capillary, and the outlet of the first evaporator is connected to the heat exchange channel of the first heat exchanger. Two connections, the outlet of the second evaporator and the heat exchange channel two of the first heat exchanger are respectively connected to the inlet of the first compressor through the heat exchange channel two of the third heat exchanger; The first heat regenerator is provided with the third capillary tube and the first heat recovery tube for heat exchange with each other, the second regenerator is provided with the fourth capillary tube and the second heat recovery tube for mutual heat exchange, and the first The outlet of the second condenser is connected to the inlet of the second gas-liquid separator through the heat exchange passage of the third heat exchanger; the gas outlet of the second gas-liquid separator is connected to the second heat exchanger The heat exchange channel one of the second heat exchanger is connected to the fourth evaporator through the fourth capillary tube, and the liquid outlet of the second gas-liquid separator is connected through the first The three capillary tubes are connected to the third evaporator, the outlet of the third evaporator is connected to the second heat exchange channel of the second heat exchanger, and the second heat exchange channel of the second heat exchanger passes through the first A heat recovery pipe is connected to the second heat recovery pipe, the outlet of the fourth evaporator is connected to the second heat recovery pipe, and the second heat recovery pipe is connected to the inlet of the second compressor.

The multi-temperature zone dual-flow path refrigeration device provided by the present invention adopts two independent cycle refrigeration systems, and transports the gaseous and liquid refrigerants in the gas-liquid separator to different evaporators for each refrigeration system, and the gaseous refrigerant It will be sent to the deep low-temperature evaporator through the heat exchanger for deep low-temperature refrigeration, and the liquid refrigerant will enter the shallow low-temperature evaporator after capillary throttling for shallow low-temperature refrigeration. In order to effectively expand the range of temperature difference, from The refrigerant output from the shallow low-temperature evaporator exchanges heat with the refrigerant entering the shallow low-temperature evaporator through heat exchange, so that the cooling temperature of the shallow low-temperature evaporator is lower, achieving the effect of multi-temperature zone refrigeration, and without using Complicated control procedures, and the heat exchanger can effectively improve energy efficiency, reduce energy consumption, achieve high energy utilization and refrigeration performance of air-cooled refrigeration equipment, expand the refrigeration temperature range to improve versatility; and two independent refrigeration systems The heat exchange between the evaporators through the third heat exchanger can further increase the temperature difference between the evaporators. On the one hand, a lower temperature can be obtained, and on the other hand, the versatility of use can be more effectively improved.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic structural view of an embodiment of a refrigeration device with multiple temperature zones and two flow paths according to the present invention.

Fig. 2 is a schematic diagram of an embodiment of a refrigeration device with multiple temperature zones and two flow paths according to the present invention.

Fig. 3 is a structural schematic diagram of the condenser of the present invention.

Fig. 4 is a schematic structural diagram of the outdoor cabinet of the present invention.

Fig. 5 is a schematic structural view of the indoor locker of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figures 1 to 5, the refrigeration device with multiple temperature zones and dual flow paths in this embodiment adopts a split structure, including an outdoor cabinet 101 and a plurality of independent indoor lockers 102, and the outdoor cabinet 101 is placed on the wall 100 outside, and the indoor locker 102 is placed on the inside of the wall 100, wherein the components such as the compressor, condenser, throttling device and fan (not shown) in the dual refrigeration system are arranged in the outdoor cabinet 101, and The evaporators of the dual refrigeration system are arranged in the corresponding indoor lockers 102 . In actual use, since the compressor is installed in the external outdoor casing 101, the noise and heat generated by the operation of the compressor will not affect the indoor side, which can effectively improve the user's indoor use comfort and improve user experience. sex. At the same time, since multiple independent indoor lockers 102 are used, the indoor lockers 102 can be placed in different rooms for use according to needs, so as to meet the needs of freezing or refrigerating items in different rooms. Wherein, the indoor locker 102 is also provided with a circulation fan (not shown), and the air circulation in the indoor locker 102 can be realized by using the circulation fan, so as to improve the uniformity of temperature distribution in the indoor locker 102 . In addition, according to user needs, the indoor locker 102 may be a horizontal cabinet, or a vertical cabinet, or a wall-mounted cabinet.

For each indoor locker 102, an air supply channel 1020 is provided in the indoor locker 102, and the air supply channel 1020 has an air outlet 1021 and an air inlet 1022, and a circulating fan 103 is also arranged in the air supply channel 1020. The circulation fan 103 can realize the air circulation in the indoor locker 102 to improve the uniformity of temperature distribution in the indoor locker 102 .

Wherein, the dual refrigeration system in this embodiment includes two sets of refrigeration systems with independent circulation: refrigeration system one and refrigeration system two, and the heat exchange between the two refrigeration systems is carried out through the third heat exchanger 63, as follows:

Refrigeration system one includes a first compressor 11 and a first condenser 21 connected together, and also includes a first evaporator 41, a second evaporator 42, a first gas-liquid separator 31 and a first heat exchanger 61; The outlet of the first condenser 21 is connected to the inlet of the first gas-liquid separator 31; the gas outlet of the first gas-liquid separator 31 is connected to the heat exchange channel of the first heat exchanger 61, The heat exchange channel of the first heat exchanger is connected with the inlet of the second evaporator 42 through the second capillary 421; the liquid outlet of the first gas-liquid separator 31 is connected with the first capillary 411 The inlet of the first evaporator 41 is connected, the outlet of the first evaporator 41 is connected with the heat exchange channel 2 of the first heat exchanger 61, the outlet of the second evaporator 42 is connected with the first heat exchanger 61 The second heat exchange channel of the third heat exchanger 63 is connected to the inlet of the first compressor 11 through the first heat exchange channel of the third heat exchanger 63 .

Refrigeration system two includes the second compressor 12 and the second condenser 22 connected together, and also includes the third evaporator 43, the fourth evaporator 44, the second gas-liquid separator 32, the second heat exchanger 62, the second A regenerator 51 and a second regenerator 52; the outlet of the second condenser 22 is connected to the inlet of the second gas-liquid separator 32 through the second heat exchange passage of the third heat exchanger 63, the The gas outlet of the second gas-liquid separator 32 is connected to the heat exchange channel of the second heat exchanger 62 , and the heat exchange channel of the second heat exchanger 62 is connected to the fourth evaporator 44 through the fourth capillary tube 441 The inlet connection of the second gas-liquid separator 32 is connected with the inlet of the third evaporator 43 through the third capillary 431, and the outlet of the third evaporator 43 is connected with the second The heat exchange channel 2 of the heat exchanger 62 is connected, and the heat exchange channel 2 of the second heat exchanger 62 is connected to the inlet of the second compressor 12 through the first heat return pipe of the first heat regenerator 51 , and the fourth The outlet of the evaporator 44 is connected to the inlet of the second compressor 12 through the second heat recovery pipe of the second heat regenerator 52 .

Specifically, the multi-temperature zone dual refrigeration system in this embodiment adopts two refrigeration systems with heat exchange and independent circulation, taking refrigeration system 1 as an example: the refrigerant is compressed by the first compressor 11 to form a high-temperature, high-pressure superheated refrigerant gas , the refrigerant gas enters the first condenser 21 to be condensed, and the dew point temperature of the high and low boiling point refrigerants in the refrigerant is different, and the refrigerant gas is condensed to form two phases rich in high boiling point refrigerant liquid and rich in low boiling point refrigerant gas Refrigerant, the refrigerant enters the first gas-liquid separator 31 for separation. The liquid-phase refrigerant rich in high-boiling point refrigerant is output from the liquid outlet of the first gas-liquid separator 31, and after throttling through the first capillary tube 411, enters the first evaporator 41 for heat exchange to form a two-phase refrigerant into the heat exchange channel 2 of the first heat exchanger 61, and the gas-phase refrigerant first enters the first heat exchanger 61 to absorb the cooling capacity of the refrigerant output by the first evaporator 41 and then forms a liquid-phase refrigerant. After being throttled by the second capillary tube 421, it enters the second evaporator 42 for heat exchange; the refrigerant output from the heat exchange channel 2 of the first heat exchanger 61 and the second evaporator 42 is sent to the third heat exchanger 62 for heat exchange The refrigerant in the channel 1 exchanges heat with the refrigerant output from the second condenser 22 in the refrigeration system 2 to form a gas refrigerant that flows back to the first compressor 11 . As for refrigeration system 2, the first regenerator 51 and the second regenerator 52 are added to achieve lower temperature refrigeration. Specifically, the refrigerant enters the third evaporator 43 for heat exchange to form two phases The refrigerant enters the second heat exchanger 62 to further exchange heat into a saturated refrigerant gas, and then the refrigerant gas enters the first heat recovery tube in the first heat regenerator 51, and the first heat recovery tube exchanges heat with the third capillary tube 431, And, the refrigerant gas is transported back from the first heat recovery pipe to the second heat recovery pipe of the second heat regenerator 52 ; In the second heat recovery pipe, after the heat exchange between the second heat recovery pipe and the fourth capillary tube 441, the cooling temperature of the fourth evaporator 44 can be reduced more, a lower cooling effect can be obtained, and energy consumption can be more effectively used , improve energy efficiency, the two evaporators in the refrigeration system are equipped with corresponding regenerators, and the regenerators can recycle the cooling capacity of the refrigerant in the return air to improve the energy utilization rate of the system, and do not require complicated control procedures to ensure While reducing the cost of the product, it also guarantees the performance of the product.

In actual use, the first evaporator 41 in refrigeration system 1 is used for refrigeration or conventional freezing, while the second evaporator 42 can be used for deep freezing in addition to conventional freezing, and can be used with different refrigerants Can realize the refrigeration of wide-span temperature range; Similarly, the third evaporator 43 in refrigeration system 2 is also used for refrigeration or conventional freezing, and the fourth evaporator 44 can realize deep freezing besides being able to be used for conventional freezing; In the refrigeration system two, compared with the refrigeration system one, the refrigeration temperature of the third evaporator 43 is lower than that of the first evaporator 41 , and meanwhile, the refrigeration temperature of the fourth evaporator 44 is lower than that of the second evaporator 42 . The multi-temperature zone dual refrigeration system in this embodiment uses a mixed refrigerant, and the mixed refrigerant includes multiple refrigerants, for example: the mixed refrigerant is a mixture of R600a and R290; or, the mixed refrigerant is R600 and R290 or, the mixed refrigerant is a mixture of R600a and R600; or, the mixed refrigerant is a mixture of R600a and R170; or, the mixed refrigerant is a mixture of R290 and R170; or, the mixed The refrigerant is a mixture of R600a, R290 and R170. Different storage temperature zones can be formed through different non-azeotropic mixed refrigerants. The working medium pair R600a/R290: can realize the storage temperature zone of -18~-30℃ and the storage temperature zone of -30~-40℃; the working medium pair R600 /R290: can realize the storage temperature zone of -6~-18℃ and -30~-40℃; working fluid pair R600/R600a: can realize the storage temperature zone of 0~9℃ and -6~-12℃ Working medium pair R600a/R170: can realize -18~-30℃ storage temperature zone and -40~-60℃ storage temperature zone; working medium pair R290/R170: can realize -20~-40℃ storage temperature zone and -40~-60℃ storage temperature zone, etc.

Wherein, according to the setting of different numbers of temperature zones, the first evaporator 41, the second evaporator 42, the third evaporator 43 and the fourth evaporator 44 can all be composed of multiple sub-evaporators, and the sub-evaporators can be Use in series or in parallel.

Furthermore, in order to more effectively improve the heat exchange between refrigeration system one and refrigeration system two, so as to obtain a refrigeration effect in a wider temperature range, the first condenser 21 in this embodiment is provided with a first additional refrigerant pipe ( unmarked), the second condenser 22 is provided with a second additional refrigerant pipe (unmarked), and the first additional refrigerant pipe and the second additional refrigerant pipe are arranged for heat exchange with each other to form a common condensation part 23 , the first condenser 21 is connected to the first compressor 11 through the first additional refrigerant pipe, and the second condenser 22 exchanges heat with the third refrigerant through the second additional refrigerant pipe. The heat exchange passage of device 63 is connected. Specifically, under the action of the common condenser 23, the high-temperature, high-pressure superheated refrigerant gas output from the first compressor 11 will exchange heat with the refrigerant output after condensing from the second condenser 22, so that the refrigeration system The condensation effect in the second system is better, and at the same time, a lower cooling temperature can be obtained by cooperating with the third heat exchanger 63 for heat exchange between the two systems. Wherein, the first condenser 21, the second condenser 22 and the common condensing part 23 are an integral structure, specifically, during the assembly process of the condenser, the refrigerant tube needs to be expanded and formed on the fins, While the first condenser 21, the second condenser 22 and the refrigerant tube expansion tubes in the common condensing part 23 are arranged in the same fin group, preferably, the first condenser 21, the The common condenser 22 and the second condenser 23 are arranged sequentially from top to bottom.

In addition, the outdoor cabinet 101 is installed outside the room as an outdoor unit, and components such as compressors, condensers and fans in the refrigeration system are arranged in the outdoor cabinet 101 . Taking the specific way of installing the first compressor 11, the first condenser 21 and the first fan 10 in the first refrigeration system as an example, the first compressor 11, the first condenser 21 and the first fan 10 are arranged on the same straight line, the first fan 10 sucks wind from the side of the first condenser 21 and blows it to the first compressor 11, which not only considers the head of the fan, but also ensures the heat dissipation effect of the compressor and the condenser, achieving Energy saving purpose. The first blower fan 10 is located between the first condenser 21 and the first compressor 11, and the first blower fan 10 can radiate heat to the first condenser 21 when sucking wind; wind, the temperature of the blown wind is relatively low, and the heat dissipation effect after being sent to the first compressor 11 is better. Further, a slope 1011 is formed on the upper surface of the first casing, and a first wind cover 1012 is arranged between the first fan 10 and the first casing, and the first wind cover 1012 is connected to the first casing. The bottom surface of the first casing, the two side walls and the first slope 1011 constitute the first air passage, preferably, the first wind cover 1012 is an arc-shaped structure, and the first air passage is along the The direction from the first fan 10 to the first compressor 11 is sequentially formed with an air duct diverging section (unmarked) and an air duct converging section (unmarked); wherein, along the fan 10 to the first compressor 11 direction, the cross-sectional area of the tapered section of the air duct gradually increases, the cross-sectional area of the tapered section of the air duct gradually decreases, the length W2 of the tapered section of the air duct and the length of the tapered section of the air duct The ratio of W1 is 1:(3-5). Specifically, the cross-section of the air duct first increases the air volume so that the wind spreads to the entire air duct section, and then the cross-section of the air duct shrinks. At this time, the wind speed gradually rises and when it blows to the surface of the first compressor 11, the wind speed is greater than that of the first fan. 10, the wind speed at the outlet increases the heat transfer coefficient on the surface of the first compressor 11; similarly, the second compressor 12, the second condenser 22 and the first fan 10' in the refrigeration system two are installed in the second shell The installation method of the body is the same as the above method, and the common condensing part 23 is arranged in the first casing and the second casing at the same time. Preferably, in order to make full use of the condensation heat of the condenser, the condenser is provided with a water heat exchanger 7, the water in the water heat exchanger 7 will absorb the condensation heat released by the condenser, and the water heat exchanger 7 is connected with the external water supply end connection, external water enters the water heat exchanger 7 for heat exchange to form hot water, realizes full use of the condensed heat energy, and improves energy utilization; and since the water heat exchanger 7 can be provided with a heat storage material, when the machine is shut down , the heat storage material can still provide heat to heat water.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. a kind of multi-temperature zone dual flow path refrigerating plant, it is characterised in that including double refrigeration systems, blower fan, outdoor machine shell and multiple Independent indoor locker；Described pair of refrigeration system includes the first compressor, the second compressor, the first vaporizer, the second evaporation Device, the 3rd vaporizer, the 4th vaporizer, the first gas-liquid separator, the second gas-liquid separator, First Heat Exchanger, the second heat exchanger, 3rd heat exchanger, the first condenser, the second condenser, the first regenerator and the second regenerator；First compressor, described Two compressors, first condenser, the first blower fan described in second condenser and second blower fan are arranged on the room In outer cage, air-supply passage is provided with the indoor locker, the air-supply passage is provided with air inlet and air outlet, described Circulating fan is provided with air-supply passage, first vaporizer, the second vaporizer, the 3rd vaporizer, the 4th vaporizer are arranged In the air-supply passage of the corresponding indoor locker；The import of first vaporizer is connected with the first capillary tube, The import of second vaporizer is connected with the second capillary tube, the outlet of first condenser and first gas-liquid separator Import connection；The gas outlet of first gas-liquid separator and the heat exchanger channels one of the First Heat Exchanger connect, and described The heat exchanger channels one of one heat exchanger are connected by second capillary tube with second vaporizer, first gas-liquid separator Liquid outlet be connected with first vaporizer by first capillary tube, the outlet of first vaporizer and described first The heat exchanger channels two of heat exchanger connect, and the outlet of second vaporizer and the heat exchanger channels two of the First Heat Exchanger lead to respectively The heat exchanger channels two for crossing the 3rd heat exchanger are connected with the import of first compressor；It is provided with first regenerator Mutually the three capillary and the first product heat cal rod of heat exchange, is provided with the described 4th of mutual heat exchange the in second regenerator Capillary tube and the second product heat cal rod, the outlet of second condenser is by the heat exchanger channels one of the 3rd heat exchanger and described the The import connection of two gas-liquid separators；The gas outlet of second gas-liquid separator and the heat exchanger channels one of second heat exchanger Connection, the heat exchanger channels one of second heat exchanger are connected by the 4th capillary tube with the 4th vaporizer, and described the The liquid outlet of two gas-liquid separators is connected by the three capillary with the 3rd vaporizer, and the 3rd vaporizer goes out Mouth is connected with the heat exchanger channels two of second heat exchanger, and the heat exchanger channels two of second heat exchanger are by first backheat Pipe is connected with second product heat cal rod, and the outlet of the 4th vaporizer is connected with second product heat cal rod, second backheat Pipe is connected with the import of second compressor.

2. multi-temperature zone dual flow path refrigerating plant according to claim 1, it is characterised in that first condenser is provided with First additional refrigerant pipe, second condenser is provided with the second additional refrigerant pipe, the first additional refrigerant pipe and described The mutual heat exchange of two additional refrigerant pipes arranges to form public condensation part, and first condenser passes through the described first additional refrigerant pipe It is connected with first compressor, second condenser is changed by the described second additional refrigerant pipe and the 3rd heat exchanger The passage of heat one connects.

3. multi-temperature zone dual flow path refrigerating plant according to claim 2, it is characterised in that first condenser, described Second condenser and the public condensation part are an overall structure.

4. multi-temperature zone dual flow path refrigerating plant according to claim 3, it is characterised in that first condenser, described The equal tube expansion of refrigerant pipe in second condenser and the public condensation part is arranged in same fins set.

5. multi-temperature zone dual flow path refrigerating plant according to claim 1, it is characterised in that first vaporizer, second Vaporizer, the 3rd vaporizer, and/or the 4th vaporizer include multiple sub- vaporizers for arranging in parallel or series.

6. multi-temperature zone dual flow path refrigerating plant according to claim 1, it is characterised in that the outdoor machine shell includes One housing and the second housing, first compressor, first condenser and first blower fan are arranged on the off-premises station In shell, first blower fan is arranged between first compressor and first condenser, first blower fan and described The first air channel is provided between first compressor, second compressor, second condenser and second blower fan are arranged In the outdoor machine shell, second blower fan is arranged between second compressor and second condenser, and described The second air channel is provided between two blower fans and second compressor.

7. multi-temperature zone dual flow path refrigerating plant according to claim 6, it is characterised in that the upper surface of first housing It is formed with first domatic, the first fan housing, first fan housing and institute is provided between first blower fan and first housing State the bottom surface of the first housing, two side and first and domatic constitute first air channel；The upper surface of second housing is formed with Second is domatic, and the second fan housing, second fan housing and described second are provided between second blower fan and second housing The bottom surface of housing, two side and second domatic constitute second air channel.

8. multi-temperature zone dual flow path refrigerating plant according to claim 7, it is characterised in that first fan housing and described Two fan housings are arc-shaped structure, and first air channel and second air channel are sequentially formed with respectively air channel gradually along blowing direction Expand section and air channel converging transition；Wherein, along blowing direction, the area of section of the air channel divergent segment gradually increases, and the air channel is gradually The area of section of contracting section is gradually reduced.

9. multi-temperature zone dual flow path refrigerating plant according to claim 1, it is characterised in that the multi-temperature zone dual flow path refrigeration Device adopts mix refrigerant, the mix refrigerant to include various cold-producing mediums.

10. multi-temperature zone dual flow path refrigerating plant according to claim 9, it is characterised in that the mix refrigerant is The mixture of R600a and R290；Or, the mix refrigerant is the mixture of R600 and R290；Or, the hybrid refrigeration Agent is the mixture of R600a and R600；Or, the mix refrigerant is the mixture of R600a and R170；Or, it is described mixed Close mixture of the cold-producing medium for R290 and R170；Or, the mix refrigerant is the mixture of R600a, R290 and R170.