CN106568274A - Double-loop multi-temperature-zone refrigeration equipment - Google Patents

Abstract

The invention provides double-loop multi-temperature-zone refrigeration equipment. The double-loop multi-temperature-zone refrigeration equipment comprises a double-refrigeration system, a fan, an outdoor unit shell and a plurality of indoor storage cabinets, wherein a first condenser in the double-refrigeration system is connected with a first gas-liquid separator; the first gas-liquid separator is connected with a first heat exchanger, the first heat exchanger is connected with a second evaporator, the first gas-liquid separator is connected with a first evaporator, the first evaporator is connected with the first heat exchanger, and the second evaporator and the first heat exchanger are connected with a first compressor through a third heat exchanger respectively; and a third capillary tube and a first heat regenerating tube which are in mutual heat exchange are arranged in a first heat regenerator, a fourth capillary tube and a second heat regenerating tube which are in mutual heat exchange are arranged in a second heat regenerator, a heat exchange channel II of the second heat exchanger is connected with the inlet of the second compressor through the first heat regenerating tube, and the outlet of a fourth evaporator is connected with the inlet of the second compressor through the second heat regenerating tube. Increase for the energy utilization rate and improvement for the refrigeration performance are realized, and a refrigeration temperature interval is expanded to improve the universality.

Description

Double-circuit multi-temperature zone refrigeration equipment

technical field

The invention relates to refrigeration equipment, in particular to a double-circuit multi-temperature zone refrigeration equipment.

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 dual-circuit multi-temperature zone refrigeration equipment, to achieve high energy utilization and refrigeration performance of the dual-circuit multi-temperature zone refrigeration equipment, and to expand the refrigeration temperature range to improve versatility.

The technical solution provided by the present invention is a dual-circuit multi-temperature zone refrigeration equipment, 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 cabinet, and the first evaporator, the second evaporator, the third evaporator, and the fourth evaporator are arranged in corresponding In the indoor locker; the first condenser and/or the second condenser is provided with a water heat exchanger; the inlet of the first evaporator is connected with a first capillary, and the second evaporator The inlet of the device 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 and the first heat exchanger The heat exchange channel is connected, the heat exchange channel of the first heat exchanger is connected with the second evaporator through the second capillary tube, and the liquid outlet of the first gas-liquid separator is connected through the first The capillary is connected to the first evaporator, the outlet of the first evaporator is connected to the second heat exchange channel of the first heat exchanger, and the outlet of the second evaporator is connected to the second heat exchange channel of the first heat exchanger. The second heat exchange channel is respectively connected to the inlet of the first compressor through the second heat exchange channel of the third heat exchanger; the first regenerator is provided with a third capillary tube and a first circuit for mutual heat exchange. heat pipe, the second heat regenerator is provided with the fourth capillary tube and the second heat return pipe for mutual heat exchange, the outlet of the second condenser passes through the heat exchange channel of the third heat exchanger and the The inlet of the second gas-liquid separator is connected; the gas outlet of the second gas-liquid separator is connected to the heat exchange channel of the second heat exchanger, and the heat exchange channel of the second heat exchanger passes through The fourth capillary is connected to the fourth evaporator, the liquid outlet of the second gas-liquid separator is connected to the third evaporator through the third capillary, and the outlet of the third evaporator is connected to the third evaporator. The heat exchange channel 2 of the second heat exchanger is connected, the heat exchange channel 2 of the second heat exchanger is connected to the inlet of the second compressor through the first heat return pipe, and the fourth evaporator The outlet of the outlet is connected to the inlet of the second compressor through the second heat return pipe.

The dual-circuit multi-temperature zone refrigeration equipment 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 the structural schematic diagram of the embodiment of the double-circuit multi-temperature zone refrigeration equipment of the present invention

Fig. 2 is a schematic diagram of an embodiment of a double-circuit multi-temperature zone refrigeration device of 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.

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 4, the dual-circuit multi-temperature zone refrigeration equipment 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.

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 split-type dual refrigeration device 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 a two-phase refrigeration system rich in high boiling point refrigerant liquid and rich in low boiling point refrigerant gas 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 into 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 to the second compressor 12 from the first heat recovery pipe; at the same time, the solid refrigerant formed into gas after heat exchange in the fourth evaporator 44 flows into the second heat recovery pipe of the second heat recovery device 52 , and the second After the heat exchange between the second heat recovery tube and the fourth capillary tube 441, the cooling temperature of the fourth evaporator 44 can be lowered even more, a lower cooling effect can be obtained, and energy consumption can be more effectively used to improve energy efficiency. The two evaporators are equipped with corresponding regenerators. 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. This ensures the cost of the product and at the same time Product performance.

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 . In this embodiment, the split-type dual refrigeration device adopts 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 a mixture of R600 and R290 mixture; 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 refrigerant The agent 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 dual-circuit multi-temperature zone refrigeration equipment is characterized in that it includes a double refrigeration system, a blower fan, an outdoor casing and a plurality of independent indoor lockers; the double refrigeration system includes a first compressor, a second compressor Machine, first evaporator, second evaporator, third evaporator, fourth evaporator, first gas-liquid separator, second gas-liquid separator, first heat exchanger, second heat exchanger, third heat exchanger, first condenser, second condenser, first regenerator and second regenerator; the first compressor, the second compressor, the first condenser, the second The first fan and the second fan of the second condenser are arranged in the outdoor cabinet, and the first evaporator, the second evaporator, the third evaporator, and the fourth evaporator are arranged in the corresponding In the indoor locker; the first condenser and/or the second condenser is provided with a water heat exchanger; the first evaporator, the second evaporator, the third evaporator, and the fourth evaporator It is arranged in the corresponding 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 The inlet of the first gas-liquid separator is connected; 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 passes through The second capillary is connected to the second evaporator, the liquid 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 first evaporator. The heat exchange channel 2 of the first heat exchanger is connected, and the outlet of the second evaporator and the heat exchange channel 2 of the first heat exchanger pass through the heat exchange channel 2 and the heat exchange channel 2 of the third heat exchanger respectively. The inlet of the first compressor is connected; the first heat regenerator is provided with the third capillary tube and the first heat exchange pipe for mutual heat exchange, and the second regenerator is provided with the first capillary tube for mutual heat exchange. Four capillary tubes and a second heat return pipe, 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 second gas-liquid separator The gas outlet of the second heat exchanger is connected to the heat exchange channel of the second heat exchanger, and the heat exchange channel of the second heat exchanger is connected to the fourth evaporator through the fourth capillary tube, and the second gas The liquid outlet of the liquid separator is connected to the third evaporator through the third capillary, and the outlet of the third evaporator is connected to the second heat exchange channel of the second heat exchanger. The second heat exchange channel of the heat exchanger is connected to the inlet of the second compressor through the first heat return pipe, and the outlet of the fourth evaporator is connected to the inlet of the second compressor through the second heat return pipe . 2. The dual-circuit multi-temperature zone refrigeration equipment according to claim 1, wherein the first condenser is provided with a first additional refrigerant pipe, and the second condenser is provided with a second additional refrigerant pipe, so The first additional refrigerant pipe and the second additional refrigerant pipe are arranged to exchange heat with each other to form a common condenser, the first condenser is connected to the first compressor through the first additional refrigerant pipe, and the second The condenser is connected to the heat exchange channel one of the third heat exchanger through the second additional refrigerant pipe. 3 . The dual-circuit multi-temperature zone refrigeration device according to claim 2 , wherein the first condenser, the second condenser and the common condensing part are of an integral structure. 4 . 4. The dual-circuit multi-temperature zone refrigerating equipment according to claim 3, characterized in that, the equal expansion tubes of the refrigerant pipes in the first condenser, the second condenser and the common condensing part are arranged in the same in the fin group. 5. The dual-circuit multi-temperature zone refrigeration device according to claim 1, wherein the first evaporator, the second evaporator, the third evaporator, and/or the fourth evaporator comprise a plurality of parallel or Sub-evaporators arranged in series. 6. The dual-circuit multi-temperature zone refrigeration device according to claim 1, wherein the outdoor casing includes a first casing and a second casing, the first compressor, the first condenser The air conditioner and the first fan are arranged in the outdoor cabinet, the first fan is arranged between the first compressor and the first condenser, the first fan and the first compressor A first air duct is arranged between the machines, the second compressor, the second condenser and the second fan are arranged in the outdoor casing, and the second fan is arranged in the second compressor A second air duct is provided between the fan and the second condenser, and between the second fan and the second compressor. 7. The dual-circuit multi-temperature zone refrigeration device according to claim 6, wherein a first slope is formed on the upper surface of the first housing, and the distance between the first fan and the first housing is A first windshield is arranged between them, and the first windshield forms the first air duct with the bottom surface, side walls and the first slope of the first casing; the upper surface of the second casing forms There is a second slope, a second wind cover is arranged between the second fan and the second housing, and the second wind cover is connected to the bottom surface, side walls and second slope of the second housing. The surface constitutes the second air channel. 8. The dual-circuit multi-temperature zone refrigeration equipment according to claim 7, characterized in that, both the first air cover and the second air cover are arc-shaped structures, and the first air duct and the Along the blowing direction, the second air duct is respectively formed with an air duct diverging section and an air duct tapering section; wherein, along the blowing direction, the cross-sectional area of the air duct expanding section gradually increases, and the air duct tapering section The cross-sectional area gradually decreases. 9. The dual-circuit multi-temperature zone refrigeration device according to claim 1, wherein the dual refrigeration system uses a mixed refrigerant, and the mixed refrigerant includes multiple refrigerants. 10. The dual-circuit multi-temperature zone refrigeration device according to claim 9, wherein the mixed refrigerant is a mixture of R600a and R290; or, the mixed refrigerant is a mixture of R600 and R290; or, the 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 refrigerant is R600a, R290 and R170 mixture.