CN116067065A - Fresh-keeping box - Google Patents

Abstract

The invention provides a fresh-keeping box, which comprises a storage box and a refrigerating system, wherein the refrigerating system comprises a refrigerating loop and a refrigerating working medium positioned in the refrigerating loop, the refrigerating loop comprises a compressor, a condensing assembly, a throttling element and an evaporator, the evaporator comprises a first evaporator for directly or indirectly cooling the storage box and a second evaporator for directly or indirectly cooling the condensing assembly, and the first evaporator and the second evaporator are arranged in parallel. According to the invention, the storage box is cooled through the first evaporator, the condensing assembly is cooled through the second evaporator, the condensing temperature of the refrigerating system is regulated to be within a preset condensing temperature range, and the refrigerating system can be ensured to normally operate or maintain an optimal operating state under any working condition; and the first evaporator and the second evaporator are connected in parallel, and can be opened alternatively or simultaneously according to the cooling condition, so that the operation and cooling of the whole system are ensured.

Description

Fresh-keeping box

Technical Field

The invention relates to the technical field of refrigeration and preservation, in particular to a preservation box.

Background

Conventional cold chain streams are typically supplied with refrigeration by a refrigeration system comprised of a compressor, a condenser, a throttling element, and an evaporator. However, the temperatures of different time periods of the morning, the evening and the morning are different throughout the year, the day and night are different, the temperature difference between day and night is larger in individual areas, and the compressor cannot work normally or provides insufficient cold under severe working conditions of a refrigerating system, such as noon in summer.

In view of the above, it is necessary to provide a fresh box to solve the above problems.

Disclosure of Invention

The invention aims to provide a fresh-keeping box which can ensure the normal operation of a refrigeration system or ensure the optimal refrigeration efficiency under any working condition.

In order to solve one of the technical problems, the invention adopts the following technical scheme:

the utility model provides a fresh-keeping case, includes storage tank and refrigerating system, refrigerating system includes refrigerating circuit and the refrigerating medium that is located refrigerating circuit, refrigerating circuit includes compressor, condensation subassembly, throttling element, evaporimeter, the evaporimeter includes directly or indirectly give the storage tank is cold the first evaporimeter, directly or indirectly give the condensation subassembly is cold the second evaporimeter, first evaporation with the parallelly connected setting of second evaporimeter.

Further, the first evaporator and the second evaporator are connected in parallel between the throttling element and the compressor; or, the throttling element comprises a first throttling element and a second throttling element which are arranged in parallel, the first evaporator is connected between the first throttling element and the compressor, and the second evaporator is connected between the second throttling element and the compressor.

Further, the first evaporator is arranged in the storage box; or the first evaporator supplies cold to the storage box through a first cold supply unit; the first evaporator comprises a refrigerant channel and a secondary refrigerant channel, and the refrigerant channel is connected between the throttling element and the compressor; the first cooling unit comprises a heat exchanger, a first cooling pipe and a first cooling return pipe which are connected with the secondary refrigerant channel and the heat exchanger, a first circulating pump which is connected with the first cooling pipe or the first cooling return pipe, and secondary refrigerant which circularly flows in the secondary refrigerant channel, the first cooling pipe and the first cooling return pipe, wherein the heat exchanger is positioned in the storage box or is arranged in an air duct which is communicated with the storage box; or the first evaporator supplies cold to the storage box through a first cold supply unit; the first evaporator comprises a refrigerant channel and a secondary refrigerant channel, the refrigerant channel is connected between the throttling element and the compressor, the refrigeration system further comprises a cold storage box communicated with the secondary refrigerant channel through a circulating pipeline, an energy storage material is arranged in the cold storage box, and a circulating pump is arranged on the circulating pipeline; the first cooling unit comprises a heat exchanger, a first cooling pipe, a first cooling return pipe and a first circulating pump, wherein the first cooling pipe and the first cooling return pipe are connected with the cold storage box and the heat exchanger, the first circulating pump is connected to the first cooling pipe or the first cooling return pipe, and the heat exchanger is located in the storage box or arranged in an air duct communicated with the storage box.

Further, the fresh-keeping box further comprises a condensation temperature management module for supplying the cold energy of the second evaporator to the condensation assembly, wherein the condensation temperature management module comprises a sensor for detecting the condensation temperature of the refrigeration system, an energy supply unit for transmitting the cold energy of the second evaporator to the condensation assembly, and a temperature control unit in communication connection with the sensor and the energy supply unit.

Further, the second evaporator comprises a refrigerant channel and a secondary refrigerant channel, wherein the refrigerant channel is connected between the throttling element and the compressor; the condensing assembly includes a first fluid channel and a second fluid channel, the first fluid channel being connected between the compressor and the throttling element; the energy supply unit comprises a communicating pipe for communicating the second fluid channel with the secondary refrigerant channel, a communicating pump connected to the communicating pipe, and secondary refrigerant positioned in the secondary refrigerant channel, the communicating pipe and the second fluid channel.

Further, the condensing assembly includes a first condenser; the energy supply unit comprises at least one fan arranged on one side of the first condenser and an energy storage unit for providing cold energy, wherein the energy storage unit comprises an energy storage container, an energy storage material arranged in the energy storage container, a radiator, an output pipe communicated with the energy storage container and an inlet of the radiator, a return pipe communicated with an outlet of the radiator and the energy storage container, and a transmission pump connected to the output pipe or the return pipe, the radiator is arranged on the air inlet side of the first condenser, the fan and the transmission pump are all in communication connection with the temperature control unit, and the second evaporator supplies cold to the energy storage material directly or indirectly.

Further, the condensing assembly includes a second condenser including a first fluid passage and a second fluid passage, the first fluid passage being connected between an outlet of the compressor and an inlet of the throttling element; the energy supply unit comprises an energy storage unit communicated with the second fluid channel, the energy storage unit comprises an energy storage container, an energy storage material positioned in the energy storage container, an output pipe communicated with the energy storage container and an inlet of the second fluid channel, a return pipe communicated with an outlet of the second fluid channel and the energy storage container, and a transmission pump connected with the output pipe or the return pipe, the transmission pump is in communication connection with the temperature control unit, and the second evaporator directly or indirectly supplies cold to the energy storage material.

Further, the second evaporator is located within the energy storage vessel; or the second evaporator supplies cold energy to the energy storage material through a second cooling unit, and comprises a refrigerant channel and a secondary refrigerant channel, wherein the refrigerant channel is connected between the throttling element and the compressor; the second cooling unit comprises a second cooling pipe and a second cooling return pipe which are communicated with the secondary refrigerant channel and the energy storage container, a first cooling pump connected to the second cooling pipe or the second return pipe, and energy storage materials positioned in the secondary refrigerant channel, the second cooling pipe and the second cooling return pipe, wherein the first cooling pump is in communication connection with the temperature control unit; or the second cooling unit comprises a pair of cooling interfaces arranged on the energy storage container, a cooling pipe connected between the pair of cooling interfaces, a third cooling pipe and a third return pipe respectively connected with the pair of cooling interfaces and two ends of the secondary refrigerant channel, a second cooling pump connected to the third cooling pipe or the third return pipe, and secondary refrigerant positioned in the secondary refrigerant channel, the third circulation pipe and the cooling pipe, and the second cooling pump is in communication connection with the temperature control unit.

The invention has the beneficial effects that: according to the invention, the storage box is cooled through the first evaporator, the condensing assembly is cooled through the second evaporator, the condensing temperature of the refrigerating system is regulated to be within a preset condensing temperature range, and the refrigerating system can be ensured to normally operate or maintain an optimal operating state under any working condition; and the first evaporator and the second evaporator are connected in parallel, and can be opened alternatively or simultaneously according to the cooling condition, so that the operation and cooling of the whole system are ensured.

Drawings

FIG. 1 is a schematic diagram of a condensing temperature management system according to a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of a condensing temperature management system according to another preferred embodiment of the present invention;

FIG. 3 is a schematic diagram of a condensing temperature management system according to another preferred embodiment of the present invention;

FIG. 4 is a schematic diagram of a condensing temperature management system according to another preferred embodiment of the present invention;

FIG. 5 is a schematic diagram of a condensing temperature management system according to another preferred embodiment of the present invention;

FIG. 6 is a schematic diagram of a condensing temperature management system according to another preferred embodiment of the present invention;

FIG. 7 is a schematic view of an evaporator according to an embodiment of the invention;

FIG. 8 is a schematic view of an evaporator in another embodiment of the invention;

FIG. 9 is a schematic diagram showing the cooperation of the evaporator, the energy supply unit and the storage box according to an embodiment of the present invention;

FIG. 10 is a schematic view showing the combination of an evaporator, an energy supply unit and a storage box according to another embodiment of the present invention;

FIG. 11 is a schematic view showing the combination of an evaporator, an energy supply unit and a storage box according to another embodiment of the present invention;

FIG. 12 is a schematic view showing the combination of an evaporator, an energy supply unit and a storage box according to another embodiment of the present invention;

FIG. 13 is a schematic view of a fresh box according to an embodiment of the present invention;

FIG. 14 is an exploded view of FIG. 13 at another angle;

FIG. 15 is a schematic diagram illustrating the cooperation of the refrigeration system, the condensation temperature management system and the storage case of FIG. 13;

FIG. 16 is a schematic diagram illustrating the refrigeration system of FIG. 15 in combination with a condensing temperature management system;

fig. 17 is a partial enlarged view of fig. 16.

Detailed Description

The present invention will be described in detail below with reference to embodiments shown in the drawings. The embodiment is not intended to limit the present invention, and structural, methodological, or functional modifications of the invention according to the embodiment are included in the scope of the invention.

Referring to fig. 1 to 17, a fresh box 100 and a refrigerating system 1 according to the present invention are shown.

The refrigeration system 1 comprises a refrigeration loop 11 and a refrigeration working medium positioned in the refrigeration loop 11, wherein the refrigeration loop comprises a compressor 12, a condensation assembly 13, a throttling element 14 and an evaporator 15 which are sequentially connected through pipelines. The refrigeration system 1 may further include conventional elements such as oil components, which are common technical means in the field, and are not listed one by one, and the working principle of refrigeration is not described again.

In the present invention, as shown in fig. 7 and 8, the evaporator 15 includes a first evaporator 151 for directly or indirectly cooling the storage case 100, and a second evaporator 152 for directly or indirectly cooling the condensing unit 13.

The first evaporator 151 and the second evaporator 152 are arranged in parallel, and the parallel connection manner includes:

in one embodiment, as shown in fig. 7, the first evaporator 151 and the second evaporator 152 are connected in parallel between the throttling element 14 and the compressor 45. Preferably, on-off valves are provided before the first evaporator 151 and the second evaporator 152, respectively; or the first evaporator 151 and the second evaporator 152 are connected to an electromagnetic three-way valve to control the refrigerant to alternatively pass through the first evaporator 151 or the second evaporator 152; or controls the refrigerant to pass through the first evaporator 151 and the second evaporator 152 at the same time.

In another embodiment, as shown in fig. 8, the throttling element 14 includes a first throttling element 141 and a second throttling element 142 disposed in parallel, the first evaporator 151 is connected between the first throttling element 141 and the compressor 12, and the second evaporator 152 is connected between the second throttling element 142 and the compressor 12. Preferably, the first throttling element 141 and the second throttling element 142 are electronic expansion valves, and whether the refrigerant passes through the corresponding first evaporator 151 or the second evaporator 152 is controlled by opening or closing the electronic expansion valves.

The first evaporator 151 may cool the storage case 100 in the following ways:

the first evaporator 151 is disposed in the storage case 100, preferably at the top of the storage case 100; further, the ventilation in the storage case 100 is accelerated by the fan, and the heat exchange speed is increased.

Or, the first evaporator 151 supplies cooling to the storage case through the first cooling unit 3.

In one embodiment, the first cooling unit 3 includes an air duct communicating with the storage case 100, and a fan driving air to circulate in the storage case 100 and the air duct, the first evaporator 151 is located in the air duct, and the air heat-exchanged with the first evaporator 151 circulates to the storage case 100 to provide cooling capacity.

In another embodiment, the first cooling unit 3 includes a cold storage tank 30, a heat exchanger 31, a first cooling pipe 32 and a first cooling return pipe 33 connecting the cold storage tank 30 and the heat exchanger 31, and a first circulation pump 34 connected to the first cooling pipe 32 or the first cooling return pipe 33, wherein a cold storage material is disposed in the cold storage tank 30, and the first evaporator 151 is disposed in the cold storage tank 30.

The heat exchanger 31 is located in the storage box 100, preferably at the top of the storage box 100, and drives air circulation by a fan to increase the heat exchange speed. When the first circulation pump 34 is started, the coolant circulates and flows, and the cooling capacity of the refrigerant is transferred to the storage box 100 through the heat exchanger 31. Or, the heat exchanger 31 is disposed in an air duct communicated with the storage box 100, and the air heat-exchanged with the heat exchanger 31 circulates to the storage box 100 under the action of a fan to provide cold energy for the storage box 100.

In another embodiment, the first evaporator 151 includes a refrigerant channel and a coolant channel, and the refrigerant channel is connected between the throttling element and the compressor. The first cooling unit 3 comprises a cooling tank 30 communicated with the coolant channel through a circulating pipeline, a circulating pump arranged on the circulating pipeline, a heat exchanger 31, a first cooling pipe 32 and a first cooling return pipe 33 which connect the cooling tank 30 with the heat exchanger 31, and a first circulating pump 34 connected to the first cooling pipe 32 or the first cooling return pipe 33, wherein a cooling storage material is arranged in the cooling tank. In the above embodiment, the heat exchanger 31 is located in the storage box 100 or disposed in an air duct communicating with the storage box 100.

In another embodiment, the first evaporator 151 includes a refrigerant channel and a coolant channel, the refrigerant channel being connected between the throttling element 14 and the compressor. The first cooling unit 3 includes a heat exchanger 31, first cooling pipes 32 and first cooling return pipes 33 connecting the coolant channels and the heat exchanger 31, a first circulating pump 34 connected to the first cooling pipes 32 or the first cooling return pipes 33, and coolant circulating in the coolant channels and the first cooling pipes 32 and the first cooling return pipes 33.

The way in which the second evaporator 152 cools the condensing assembly 13 includes, but is not limited to, the following:

the fresh box further includes a condensing temperature management module 2 that transfers the cooling capacity of the second evaporator 152 to the condensing assembly 13. The refrigeration system 1 and the condensation temperature management module 2 may also be collectively referred to as a condensation temperature management system 200.

Specifically, the condensation temperature management module 2 includes a sensor for detecting the condensation temperature of the refrigeration system 1, an energy supply unit for transmitting the cooling capacity of the second evaporator 152 to the condensation module 13, and a temperature control unit communicatively connected to the sensor and the energy supply unit. The temperature control unit controls the cooling capacity provided by the energy supply unit to the condensation assembly 13 according to the detection result of the sensor, and maintains the condensation temperature of the refrigeration system 1 within a preset condensation temperature range. Wherein "providing refrigeration" refers to providing a medium to the condensing assembly 13 that is cooler than it is.

In addition, the condensation temperature management module 2 may also provide heat to the condensation module 13 via an energy supply unit, i.e. to the condensation module 13 a medium having a temperature higher than that of the condensation module. Specifically, the condensation temperature management module 2 may provide cold, or may provide heat, or may provide cold, but the cold and heat are provided under different conditions, and not simultaneously; so as to maintain the condensation temperature within a preset condensation temperature range and ensure the normal operation and the high-efficiency refrigeration performance of the whole system.

When the sensor detects that the condensing temperature of the refrigerating system 1 is higher than a preset condensing temperature range, cold energy is provided to the condensing assembly 13 through the energy supply unit; when the sensor detects that the condensing temperature of the refrigeration system 1 is lower than a preset condensing temperature range, reducing the cold supply by the energy supply unit, or stopping the cold supply, or providing heat to the condensing assembly 13; the condensation temperature is controlled within a preset temperature range, so that the refrigerating system 1 can normally operate or keep the optimal operation state under any working condition.

In the invention, the preset condensing temperature range is 10-80 ℃; preferably between 30 and 60 ℃, more preferably between 35 and 45 ℃. In the preferred range, the refrigeration system has high refrigeration efficiency. Specifically, the condensing temperatures of the different refrigerant mediums are different as shown in table 1.

TABLE 1 Normal and optimal working condensing temperatures for different refrigerant substances

The sensor directly or indirectly detects the condensing temperature of the refrigeration system 1, including but not limited to the following:

in an embodiment, the sensor includes a pressure sensor for acquiring the pressure of the refrigerant, where the pressure sensor is disposed at any position of the refrigeration circuit between the outlet of the compressor 12 and the inlet of the throttling element 14, specifically, at the outlet of the compressor 12, at the inlet of the throttling element 14, or on a pipe connecting the outlet of the compressor 12 and the inlet of the throttling element 14. The pressure on the refrigeration circuit 11 of this section is almost the same, so that the pressure sensor is arranged at any position and the result is almost the same; the condensing temperature is then converted based on the detected pressure.

In another embodiment, the sensor includes a temperature sensor for acquiring the temperature of the refrigerant, where the temperature sensor is located between the second half of the condensing unit 13 or the outlet of the condensing unit 13 and the inlet of the throttling element 14, and the temperature of the liquid refrigerant acquired by the temperature sensor is substantially the same as or not substantially different from the condensing temperature, and may be approximately the condensing temperature, or empirically calibrated to the condensing temperature. Wherein "disposed between the outlet of the condensing assembly 13 and the inlet of the throttling element 14" includes the placement of a temperature sensor at the outlet of the condensing assembly 13, or at the inlet of the throttling element 14, or at any location of the refrigeration circuit connecting the outlet of the condensing assembly 13 and the inlet of the throttling element 14. In general, the condensation of the refrigerant is performed in the condensation module 13, and therefore it is preferable to provide a temperature sensor at the latter half of the condensation module 13 or at the outlet of the condensation module 13.

In another embodiment, the sensor includes an ambient temperature sensor to obtain an ambient temperature, and the condensation temperature is converted based on the detected ambient temperature. The ambient temperature may be provided at any location of the condensing unit 13 or the refrigeration system, or may be provided on a product employing the condensing temperature management system 100. The ambient temperature refers to the temperature of the environment where the condensation assembly 13 is operated, for example, a ring temperature sensor is placed at an air inlet of an air-cooled condenser, if the detected temperature is higher, the ring temperature is higher, and the air passing through the condenser cannot effectively cool the condenser, so that the condensation temperature is also higher.

Or in other embodiments, the sensor includes at least two of the pressure sensor, the temperature sensor and the ring temperature sensor, and detection is performed by the at least two sensors, so that on one hand, the sensors can be mutually calibrated, and accuracy of detection data is improved; on the other hand, when one sensor fails, the other sensor can ensure that the condensation temperature management module 2 operates normally.

In the present invention, the cooling capacity provided by the energy supply unit to the condensing unit 13 is from the second evaporator 152, and the condensing temperature management can be realized without using an external refrigeration or cooling system.

In conjunction with the structure of the condensing unit 13, it will be described how the energy supply unit supplies the cooling capacity of the second evaporator 152 to the condensing unit 13.

In the first type of embodiment, as shown in fig. 1 to 3, the condensation assembly 13 includes an air-cooled first condenser 131, where the first condenser 131 includes a condensation tube, and preferably further includes a heat dissipation fin, where the heat dissipation fin is used to increase a heat exchange area and improve heat exchange performance.

Accordingly, the energy supply unit includes at least one fan 21 provided at one side of the first condenser 131, and a first energy storage unit 22 providing cold to air passing through the first condenser 131. The fan 21 and the first energy storage unit 22 are both in communication connection with the temperature control unit.

When the number of fans 21 is at least two, all fans 21 are located on the same side of the first condenser 131, so that air is prevented from forming a vortex at the first condenser 131, which is not beneficial to heat dissipation. Preferably, the first condenser 131 is located at the suction side of the fan 21, and the wind uniformly passes through the first condenser 131, so that the heat exchange performance is good.

The temperature control unit controls the rotating speed of the fan 21 to be adjusted between 0 and 100 percent according to the detected condensation temperature, and controls the cooling capacity according to the air supply quantity in unit time. Wherein, when the rotation speed is 0, the fan 21 is in a closed state; at 100% rotational speed, the fan 21 is in a full load state. Specifically, taking cooling as an example, when the condensing temperature is too high, the rotating speed of the fan 21 is increased, and the air supply amount in unit time is increased; after the condensation temperature is reduced, the rotation speed of the blower 21 is reduced or the blower 21 stops working.

The first energy storage unit 22 comprises a first energy storage container 221, a first energy storage material positioned in the first energy storage container 221, a radiator 222, a first output pipe 223 communicated with the inlet of the first energy storage container 221 and the radiator 222, a first return pipe 224 communicated with the outlet of the radiator 222 and the first energy storage container 221, and a first transmission pump 225 connected to the first output pipe 223 or the first return pipe 224, wherein the first transmission pump 225 is in communication connection with the temperature control unit; the second evaporator 152 directly or indirectly via the second cooling unit 4 cools the first energy storage material.

Matching energy storage materials according to the working environment of the refrigerating system 1, and if the working environment is usually a high-temperature environment, matching a first energy storage material with lower temperature or lower phase transition temperature; if the operating environment is typically a low temperature environment, then the first energy storage material with a higher temperature or a higher phase transition temperature is matched.

Preferably, the phase transition temperature of the first energy storage material is-80-45 ℃, preferably-40-30 ℃. Providing cold to the first condenser 131 at high temperature and providing heat to the first condenser 131 at low temperature; at this time, the first energy storage unit for cooling and heating is the same. Of course, the first energy storage units for cooling and heating can also be two units with the same or different structures, and each unit can independently operate.

Referring to fig. 1 to 3 and 5 to 6, the radiator 222 is located on the air intake side of the first condenser 131 along the direction of the air path passing through the first condenser 131. Specifically, when the first condenser 131 is located on the suction side of the fan 21, the radiator 222 is located on the side of the first condenser 131 facing away from the fan 21; when the first condenser 131 is located on the air outlet side of the fan 21, the radiator 222 is located between the first condenser 131 and the fan 21 or on the air suction side of the fan 21.

The first transfer pump 225 is started, the first energy storage material flows between the first energy storage container 221 and the radiator 222, and cold or heat is released outwards through the radiator 222, and the air after heat exchange with the radiator 222 flows to the first condenser 131 under the driving of the fan 21, so as to provide cold or heat for the first condenser.

In a second class of embodiments, as shown in fig. 4, the condensing assembly 13 comprises a water-cooled second condenser 132, the second condenser 132 comprising a first fluid channel connected between the outlet of the compressor 12 and the inlet of the throttling element 14 and a second fluid channel for communication with the energy supply unit.

The second condenser 132 includes, but is not limited to: plate heat exchangers, shell and tube condensers, double tube condensers, as long as two fluid passages through which heat can be exchanged are provided.

Accordingly, the energy supply unit includes a second energy storage unit 23 in communication with the second fluid channel, the second energy storage unit 23 includes a second energy storage container 231, a second energy storage material located in the second energy storage container 231, a second output pipe 232 in communication with the second energy storage container 231 and an inlet of the second fluid channel, a second return pipe 233 in communication with an outlet of the second fluid channel and the second energy storage container 231, and a second transfer pump 234 connected to the second output pipe 232 or the second return pipe 233, and the second transfer pump 234 is in communication connection with the temperature control unit. The second energy storage units for cooling and heating can be the same or two. The second evaporator 152 supplies cold to the second energy storage material for cooling either directly or indirectly through the second cooling unit 4.

When the second transfer pump 234 is started, the second energy storage material flows between the second energy storage container 231 and the second fluid channel, and exchanges heat with the refrigerant in the first fluid channel, so as to provide cold or heat for the refrigerant.

The selection matching mode of the second energy storage material and the first energy storage material is the same, and details are omitted.

In a third embodiment, as shown in fig. 5 to 6, the condensation assembly 13 includes the air-cooled first condenser 131 and the water-cooled second condenser 132, and the first condenser 131 is connected in series with the first fluid channel. The condensation temperature management module 2 is arranged to provide cooling to the first condenser 131 as described in the first type of embodiment, while providing cooling to the second condenser 132 as described in the second type of embodiment. The third class of embodiments is essentially a superposition of the first class of embodiments and the second class of embodiments.

The inventors have found in further studies that the medium supplying cold to the first condenser 131 by the blower 21 is pollution-free air without post-treatment; the medium for providing cold or heat to the second condenser 132 through the second energy storage unit 23 is a liquid energy storage material; the air-cooled first condenser 131 is low in temperature control cost, environment-friendly and high in control flexibility, but is less effective in temperature reduction than the water-cooled second condenser 132.

In one embodiment, the outlet of the first condenser 131 is in communication with the inlet of the first fluid passage. The working environment suitable for the refrigeration system 1 is mild, and in most cases, the air-cooled first condenser 131 can control the condensation temperature within a preset condensation temperature range. Taking the example of providing cold to the condensing unit 13, the high-temperature and high-pressure refrigerant from the compressor 12 passes through the first condenser 131 and then passes through the second condenser 132; if the temperature reaches the preset condensation temperature range after passing through the air-cooled first condenser 131, the second energy storage unit 23 is not required to be started to provide cold energy for the second condenser 132; if the preset condensation temperature range is not reached, the second transfer pump 234 is turned on to supplement a part of the cooling capacity of the second condenser 132, so that the energy is saved as a whole.

At this time, when the sensor includes the temperature sensor, the temperature sensor is preferably located at the second half of the first condenser 131 or between the outlet of the first condenser 131 and the inlet of the first fluid channel, so as to timely determine the temperature of the refrigerant passing through the first condenser 131 located upstream, thereby determining whether the second energy storage unit 23 needs to be started. Of course, the temperature sensor may also be disposed at the second half of the second condenser 132 or at the outlet thereof.

In another embodiment, the inlet of the first condenser 131 communicates with the outlet of the first fluid passage. The method is suitable for the condition that the working environment of the refrigeration system 1 is bad, such as perennial high temperature and areas near the equator. The high-temperature and high-pressure refrigerant from the compressor 12 passes through the second condenser 132 and then passes through the first condenser 131; if the temperature reaches the preset condensation temperature range after passing through the second condenser 132, the fan 21 is not required to be started to provide cold energy for the first condenser 131; if the preset condensation temperature range is not reached, the fan 21 is turned on to provide cooling capacity for the first condenser 131.

At this time, when the sensor includes the temperature sensor, the temperature sensor is located between the second half of the second condenser 132 or the outlet of the first fluid passage and the inlet of the first condenser 131. The temperature of the refrigerant passing through the second condenser 132 located upstream is timely determined, and whether the fan 21 needs to be started is determined. Of course, the temperature sensor may also be disposed at the second half of the first condenser 131 or at the outlet thereof.

In the fourth class of embodiments, the only differences from the third class of embodiments are: the first condenser 131 is connected in parallel with the first fluid channel, and the other parts will not be described again. In this context, if the fluid flow of the branch needs to be regulated, the parallel connection parts are all connected through electromagnetic three-way valves, and the description is omitted.

For convenience of description, the first energy storage unit 22 and the second energy storage unit 23 are collectively referred to as energy storage units 22 and 23, and the remaining structures thereof are substantially the same except that the first energy storage unit 22 has the radiator 222; the first energy storage container 221 and the second energy storage container 231 are collectively referred to as energy storage containers 221 and 231, and the first energy storage material and the second energy storage material are collectively referred to as energy storage materials.

In the present invention, which is applicable to the four embodiments, the second evaporator 152 first supplies cold energy to the energy storage material, and when the condensing temperature needs to be adjusted, the cold energy is supplied to the condensing unit 13 from the energy storage material. The manner in which the second evaporator 152 cools the energy storage material includes, but is not limited to:

in a first embodiment, as shown in fig. 9, the second evaporator 152 is located in the energy storage containers 221,231 to directly cool the energy storage material.

Alternatively, the second evaporator 152 supplies cold to the energy storage material through the second cold supply unit 4, including but not limited to the following:

in a second embodiment, as shown in fig. 10, the second evaporator 152 includes a refrigerant passage and a coolant passage, and the refrigerant passage is connected between the throttling element 14 and the compressor 12.

The second cooling unit 4 includes a second cooling pipe 41 and a second cooling return pipe 42 that communicate the coolant channel with the energy storage containers 221,231, a first cooling pump 43 connected to the second cooling pipe 41 or the second return pipe, and an energy storage material circulating in the coolant channel and the second cooling pipe 41 and the second cooling return pipe 42, where the first cooling pump 43 is in communication with the temperature control unit. When the first cold charge pump 43 works, the energy storage material exchanges heat with the refrigerating medium in the refrigerating medium channel, the temperature is reduced, and the cold energy is stored.

The third embodiment, as shown in fig. 11, differs from the second embodiment shown in fig. 10 only in that:

the second cooling unit 4 includes a pair of cooling ports provided on the energy storage container, a cooling pipe 44 connected between the pair of cooling ports, a third cooling pipe 45 and a third return pipe 46 respectively connected to the pair of cooling ports and both ends of the coolant channel, a second cooling pump 47 connected to the third cooling pipe 45 or the third return pipe 46, and coolant circulating in the coolant channel and the third circulation pipe and the cooling pipe 44, and the second cooling pump 47 is in communication with the temperature control unit. When the second charge pump 47 is operated, the coolant flows through the charge tubes 44 to provide cooling to the energy storage material.

Referring to fig. 13 to 17, a specific fresh-keeping box is shown, the first evaporator 151 of the refrigeration system is disposed in the storage box 100 to provide cooling capacity, and the other structures are disposed at the outer side, such as the front side, of the storage box. In the refrigeration system, the first condenser 131 and the second condenser 132 are connected in series, and the condensation temperature pipe system adjusts the condensation temperature of the whole refrigeration system by adjusting the cold energy given to the two.

In this embodiment, only one energy storage container 221 (223) is provided, the second evaporator 152 is disposed in the energy storage container 221 (223), the energy storage container 221 (223) outputs the energy storage material outwards through a transmission pump 225 (234), the first output pipe 223 and the second output pipe 232 are connected in parallel through an electronic three-way valve and then connected to the transmission pump 225 (234), and the first return pipe 224 and the second return pipe 233 are connected in parallel and then connected to the energy storage container 221 (223). Specifically, the transfer pump 225 (234) is used in conjunction with an electronic three-way valve to regulate the cooling capacity supplied to the first condenser 131 and the second condenser 132, respectively.

In addition, as shown in fig. 17, the radiator 222 is integrated with the first condenser 131. Specifically, the heat dissipating tube of the heat sink 222 is fixed together with the condenser tube, and the heat dissipating tube is located at the air intake side of the condenser tube.

The invention also provides a control method of the fresh-keeping box, which mainly comprises the operation control of the refrigerating system 1 and the cooling control of the evaporator 15.

Based on or for the first to third embodiments, the present invention provides a control method for a fresh-keeping box. The method comprises the following steps: in the running state of the refrigerating system 1, acquiring the storage temperature in the storage box 100, and judging whether the storage temperature is in a preset storage temperature range or not; if yes, the first evaporator 151 is terminated to provide cold to the storage case 100, and the second evaporator 152 is directly or indirectly provided with cold to the energy supply unit; if not, the first evaporator 151 directly or indirectly supplies the cooling power to the storage case 100, and the second evaporator 152 ends to supply the cooling power to the cooling power supply unit.

In this method, when it is not necessary to provide the storage bin 100 with the cooling amount, the energy supply unit is provided with the cooling amount and stored by the second evaporator 152, and then the condensing assembly 13 is supplied to adjust the condensing temperature when necessary.

When the first evaporator 151 directly provides cooling capacity for the storage box 100, the cooling medium is controlled to flow through the first evaporator 151 to cool the storage box 100, and the cooling medium is cut off from flowing through the first evaporator 151 to finish cooling the storage box 100.

When the first evaporator 151 indirectly provides the cooling capacity for the storage box 100, the cooling medium needs to be controlled to flow through the first evaporator 151, and the first cooling unit 3 is turned on to cool the storage box 100. The method for ending the first evaporator 151 to provide cooling capacity to the storage case 100 includes: the flow of the working fluid through the first evaporator 151 is cut off, and/or the first cooling unit 3 that transfers the cooling capacity of the first evaporator 151 to the storage case 100 is turned off.

When the second evaporator 152 directly provides the cooling capacity for the energy supply unit, only the refrigerating medium is controlled to flow through the second evaporator 152 to provide the cooling capacity for the energy supply unit; the flow of the working fluid through the second evaporator 152 is cut off, and the cooling of the energy supply unit is terminated.

When the second evaporator 152 indirectly provides the cooling capacity to the energy supply unit, the refrigerant needs to be controlled to flow through the second evaporator 152, and the second cooling unit 4 is turned on to cool the energy supply unit. The method for ending the second evaporator 152 to provide cold to the energy supply unit is as follows: the flow of working medium through the second evaporator 152 is shut off and/or the second cooling unit 4, which transfers the cold of the second evaporator 152 to the energy supply unit, is shut off.

Preferably, the control method of the fresh-keeping box further comprises the following steps: judging whether the energy supply unit reaches a preset energy storage range, if so, ending the second evaporator 152 to provide cold for the cold energy supply unit; if not, the cooling capacity is supplied to the cooling capacity supply unit through the second evaporator 152.

The control method of the fresh-keeping box further comprises the following steps: judging whether the storage temperature reaches a preset storage temperature range or not, judging whether an energy supply unit reaches a preset energy storage range or not, and if at least one of the judgment is negative, starting the refrigerating system 1; if both of the above determinations are yes, the refrigeration system 1 is turned off.

The invention also provides a control method of the second fresh-keeping box, which is different from the control method of the first fresh-keeping box only in that: the first evaporator 151 directly or indirectly provides the cooling power to the storage case 100, and the second evaporator 152 directly or indirectly provides the cooling power to the energy supply unit, which is generally suitable for a situation where the cooling power is required to be provided to the energy supply unit.

In the present invention, the method of supplying heat to the energy supply unit includes, but is not limited to, the following cases:

the fresh-keeping box is externally provided with a solar water heater, an energy storage material is arranged in the solar water heater and is communicated with the energy storage containers 221 and 231 through a heat supply circulating pipe, a heat supply pump is arranged on the heat supply circulating pipe and is in communication connection with the temperature control unit, and the energy storage material is driven to circulate in the solar water heater and the energy storage containers when the heat is required to be filled.

Or, a pair of heat charging interfaces are arranged on the energy storage container, the heat charging pipes are connected between the pair of heat charging interfaces, the refrigerating medium is arranged in the solar water heater and is communicated with the pair of heat storage interfaces through the heat supply circulating pipe, the heat supply pump is arranged on the heat supply circulating pipe and is in communication connection with the temperature control unit, and the refrigerating medium is driven to circulate in the solar water heater and the heat charging pipes when heat needs to be charged, so that heat is provided for the energy storage material.

Or the fresh-keeping box is arranged on vehicles such as a car, a ship and an airplane, and heat is provided for the energy storage material through waste heat generated in the transportation process of the vehicles. Taking the transport fresh-keeping box as an example, the heat supply circulating pipe communicated with the energy storage containers 221 and 231 or the pair of heat filling interfaces can be extended to waste heat sources such as an engine, an exhaust pipe and a generator, and waste heat is obtained from the waste heat sources through an external heat exchanger or is wound on the waste heat sources.

The pair of heat charging interfaces and the pair of cold charging interfaces can be the same or different, and the heat charging pipe and the cold charging pipe can be the same or different.

The invention also provides a control method of the third fresh-keeping box, when the ring temperature is lower, for example, lower than the preset ring temperature range, the heat is obtained from the solar water heater or the waste heat source and stored in the energy storage unit.

Based on the control methods of all the fresh-keeping boxes, judging whether the condensing temperature of the refrigerating system exceeds a preset condensing temperature range in the running state of the refrigerating system, and if so, starting an energy supply unit to provide cold or heat for the condensing assembly; if not, no cooling or heating is required.

Preferably, after the energy supply unit is started to supply cold energy to the condensation assembly, the second evaporator 152 supplies cold energy to the energy supply unit, and when the working condition suddenly becomes severe, the cold energy is supplied to the condensation assembly in time.

The following will focus on: how the energy supply unit storing cold and/or heat adjusts the condensation temperature.

Based on or for the first type of embodiments having only an air-cooled first condenser, the condensing temperature is mainly adjusted by controlling the air supply amount of the blower 21, the cooling amount or heating amount of the first energy storage unit 22.

The control method of the fresh-keeping box further comprises the following steps of obtaining the condensation temperature of the refrigerating system 1; at least one of the air supply amount of the fan 21 to the first condenser 131, the cooling amount of the first energy storage unit 22, or the heat supply amount of the first energy storage unit 22 is selectively controlled according to the condensing temperature to control the condensing temperature within a preset condensing temperature range, for example, 10 ℃ to 80 ℃, or 30 ℃ to 60 ℃, or 35 ℃ to 45 ℃.

Specifically, the method for obtaining the condensation temperature of the refrigeration system 1 includes, but is not limited to, the following methods: the pressure of the refrigerant between the outlet of the compressor 12 and the inlet of the throttling element 14 is obtained, and the condensation temperature is converted according to the pressure. Or, the temperature of the refrigerant is obtained at the second half section of the first condenser 131, or at the outlet of the first condenser 131, or on a pipeline connected with the outlet of the first condenser 131, and the temperature of the refrigerant is obtained by converting the temperature of the refrigerant into the condensation temperature, specifically, the temperature of the refrigerant can be directly obtained by directly placing a probe of a temperature sensor in the refrigerant, or the temperature can be obtained at the outer side of the refrigerant loop, and then the temperature of the refrigerant is obtained by correcting. Or, obtaining the ambient temperature, and converting the condensing temperature according to the ambient temperature; the temperature of the air-cooled condenser on the air inlet side is usually obtained to roughly estimate the condensing temperature.

Specifically, if the obtained condensation temperature is higher than the preset condensation temperature range, and the condensation temperature is still higher than the preset condensation temperature range after the preset time, the condensation temperature is determined to be higher than the preset condensation temperature range; if the obtained condensing temperature is lower than the preset condensing temperature range, the condensing temperature is still lower than the preset condensing temperature range after the preset time, and the condensing temperature is determined to be lower than the preset condensing temperature range.

When the condensing temperature is lower than the set condensing temperature range, reducing the air supply quantity, or reducing the cooling capacity of the first energy storage unit, or increasing the heat supply capacity of the first energy storage unit; when the condensing temperature is higher than the set condensing temperature range, increasing the air supply quantity or increasing the cooling capacity of the first energy storage unit; and adjusting the condensation temperature to be within a preset condensation temperature range.

Specifically, when the condensation temperature is higher than the preset condensation temperature range, the air supply amount is better than the air supply amount of the first energy storage unit, i.e. the air supply amount supplied to the first condenser 131 is increased, the requirement cannot be met, and the first energy storage unit is started to provide the cold energy.

When the condensing temperature is lower than the preset condensing temperature range, the condition that the ambient temperature is higher than the preset annular temperature range indicates that the cooling capacity is excessive, and at the moment, the cooling capacity of the first energy storage unit is regulated in preference to the air supply capacity, so that the condensing temperature can quickly respond to and be regulated to be within the preset condensing temperature range.

Specifically, when the condensing temperature is lower than a preset condensing temperature range and the ambient temperature is higher than a preset ring temperature range, judging whether the first energy storage unit is supplying cold or not, if so, reducing the cold supply of the first energy storage unit; if not, the air supply quantity of the fan is reduced.

Further, when the air supply quantity of the fan is reduced to 0, if the condensing temperature is still lower than the preset condensing temperature range in the preset time, the first energy storage unit is used for providing heat, and meanwhile, the fan is started to maintain the condensing temperature within the preset condensing temperature range.

When the condensing temperature is lower than the preset condensing temperature range, the ambient temperature is lower than the preset ring temperature range, and the air supply quantity regulation of the fan is better than the heat supply quantity regulation of the first energy storage unit.

Specifically, judging whether the fan is running, if so, reducing the air supply quantity until the air supply quantity is zero; if not, the first energy storage unit is started to provide heat, and meanwhile, the fan is started.

Further, the air supply quantity is reduced to 0, and if the condensation temperature is still lower than the preset condensation temperature range within the preset time, the fan is started, and the first energy storage unit is started to provide heat.

In the invention, the air supply quantity is regulated by the working quantity of the fans 21 and the rotating speed of the fans 21.

In addition, the condensation temperature is adjusted based on or for the second type of embodiment with only a water-cooled second condenser, mainly by controlling the second energy storage unit 33 to provide cold or heat.

The control method of the fresh-keeping box further comprises the following steps: acquiring the condensation temperature of the refrigeration system 1; the cooling or heating capacity of the second energy storage unit 33 is controlled according to the condensing temperature to control the condensing temperature to 10 to 80 ℃, or 30 to 60 ℃, or 35 to 45 ℃. The condensation temperature range is preset.

In particular, the method for obtaining the condensation temperature of the refrigeration system 1 is substantially the same as the above method, except that: the second condenser 132 is at the second half, or at the outlet of the second condenser 132, and the temperature of the refrigerant is obtained on a pipeline connected to the outlet of the second condenser 132.

And when the condensing temperature is lower than the set condensing temperature range, reducing the cooling capacity of the second energy storage unit or increasing the heating capacity of the second energy storage unit.

When the condensing temperature is lower than the preset condensing temperature range, the cooling is excessive when the ambient temperature is higher than the preset ring temperature range. Judging whether the second energy storage unit is supplying cold or not, if so, reducing the cold supply capacity of the second energy storage unit to 0; if not, the second energy storage unit is used for providing heat.

When the condensing temperature is lower than a preset condensing temperature range, the ambient temperature is lower than a preset ring temperature range, and heat is provided for the second condenser through the second energy storage unit.

When the condensing temperature is higher than the set condensing temperature range, increasing the cooling capacity; and adjusting the condensation temperature to be within a preset condensation temperature range.

Based on or used in the third or fourth embodiments, when the first condenser 131 is connected in series or parallel with the second condenser 132, the method for controlling the fresh-keeping box further includes the following steps: acquiring the condensation temperature of the refrigeration system 1; according to the condensation temperature, at least one of the air supply amount of the fan 21 to the first condenser 131, the cooling amount of the second energy storage unit to the second condenser 132, or the heat supply amount of the second energy storage unit to the second condenser 132 is selectively controlled to control the condensation temperature within a preset condensation temperature range.

Specifically, the condensing temperature of the refrigeration system 1 is the same as that of the above embodiment, except that: the temperature of the refrigerant may be obtained in the second half of the first condenser 131, or at the outlet of the first condenser 131, or on a line connected to the outlet of the first condenser 131, or in the second half of the second condenser 132, or at the outlet of the second condenser 132, or on a line connected to the outlet of the second condenser 132, and the condensation temperature may be converted from the temperature of the refrigerant.

According to the method, at least one of the air supply quantity, the cooling quantity or the heat supply quantity is regulated, the cooling quantity and/or the heat supply quantity in unit time is regulated, and the condensation temperature of the refrigerating system 1 is controlled to be 10-80 ℃, 30-60 ℃ or 35-45 ℃.

When the condensing temperature is lower than the set condensing temperature range, the air supply quantity is reduced, or the cooling capacity is reduced, or the heat supply quantity is increased; when the condensing temperature is higher than the set condensing temperature range, the air supply quantity is increased or the cooling quantity is increased; and adjusting the condensation temperature to be within a preset condensation temperature range.

Specifically, when the condensing temperature is higher than the preset condensing temperature range, the air supply quantity is adjusted better than the cooling quantity of the second energy storage unit, namely, the air supply quantity is adjusted first, and if the expected cooling quantity cannot be achieved, the cooling quantity of the second energy storage unit is adjusted.

Preferably, when the condensation temperature is higher than the preset condensation temperature range, the air supply amount is adjusted better than the cooling amount of the second energy storage unit, i.e. the air supply amount to the first condenser 131 is increased, the requirement is not satisfied, and the second transfer pump 234 is started to provide cooling amount to the second condenser 132.

When the condensing temperature is lower than the preset condensing temperature range and the ambient temperature is higher than the preset annular temperature range, the excessive cooling is indicated, and the adjustment of the cooling capacity of the second energy storage unit is higher than the adjustment of the air supply capacity at the moment, so that the condensing temperature can be quickly responded and changed to be within the preset condensing temperature range.

Specifically, when the condensing temperature is lower than a preset condensing temperature range and the ambient temperature is higher than a preset ring temperature range, judging whether the second energy storage unit is supplying cold or not, if so, reducing the cold supply of the second energy storage unit; if not, the air supply quantity of the fan is reduced.

Further, when the air supply quantity of the fan is reduced to 0, if the condensing temperature is still lower than the preset condensing temperature range within the preset time, the second energy storage unit supplies heat to the second condenser, and the condensing temperature is maintained within the preset condensing temperature range.

When the condensing temperature is lower than the preset condensing temperature range, the ambient temperature is lower than the preset ring temperature range, and the air supply quantity regulation of the fan is better than the heat supply quantity regulation of the second energy storage unit.

Specifically, judging whether the fan is running, if so, reducing the air supply quantity until the air supply quantity is zero; if not, the second energy storage unit is started to provide heat.

Further, the air supply quantity is reduced to 0, and if the condensation temperature is still lower than the preset condensation temperature range within the preset time, the energy storage unit is started to provide heat for the second condenser.

Further, in the embodiment having the first energy storage unit 22, the first energy storage unit 22 may be turned on to provide cold to the air flowing to the first condenser 131.

The air supply quantity is adjusted by the working quantity of the fans 21 and the rotating speed of the fans 21. Further, the first energy storage unit 22 may be turned on to provide cold to the air flowing to the first condenser 131.

In addition, the condensing assembly 13 is preferably arranged at the outer side of the fresh-keeping box, and natural wind blows through the condensing assembly 13 in the process of transporting the fresh-keeping box, so that the condensing assembly 13 can be cooled; even if no blower is provided, the function of turning on the blower 21 can be equivalent to that in the first kind of embodiment. However, when the fresh box is stationary, the temperature management module 2 needs to be activated. Preferably, the fan 21 is disposed at the front side of the condensing fan 21, and the fan 21 may be turned on simultaneously during operation.

In addition, the energy supply unit may be adapted to the second, third and fourth embodiments having the water-cooled second condenser 132, and may directly transfer the cold energy of the second evaporator 152 to the condensing unit 13 without storing the cold energy.

As shown in fig. 12, in the fourth embodiment, the energy supply unit includes a communication pipe 24 that communicates the second fluid passage with the coolant passage, a communication pump 25 that is connected to the communication pipe 24, and coolant that is located in the coolant passage and the communication pipe 24 and the second fluid passage. The communication pump 25 is in communication connection with the temperature control unit, and drives the coolant to circulate, so as to transfer the cooling capacity of the second evaporator 152 to the second condenser 132.

Correspondingly, the invention also provides a control method of the fourth fresh-keeping box, which is based on or used for the fourth embodiment. The control method of the first and second fresh-keeping boxes is only different from the control method of the first and second fresh-keeping boxes in that: the switch control of the refrigeration system and the cooling mode for the condensation component 13 are the same, and are not described again.

The fourth control method of the fresh-keeping box comprises the following steps: acquiring storage temperature in the storage box 100, and judging whether the storage temperature is within a preset storage temperature range; if yes, the refrigeration system 1 is turned on, the first evaporator 151 provides cold to the storage box 100, and if not, the refrigeration system 1 is turned off.

When the refrigerating system 1 is operated, judging whether the condensing temperature of the refrigerating system 1 is higher than a preset condensing temperature range, and if so, providing cold energy for the condensing assembly 13 through a second evaporator 152 arranged in parallel with the first evaporator 151; if not, the flow of refrigerant through the second evaporator 152 is shut off.

When the condensation temperature is higher than the preset condensation temperature range, the cooling capacity needs to be provided for the second condenser 132, and the refrigerant is controlled to pass through the second evaporator 152 and the communication pump 24 is started at the same time; the condensing temperature is not higher than the preset condensing temperature range, and when the cooling capacity is not needed to be provided to the second condenser 132, the refrigerant is cut off from passing through the second evaporator 152 and/or the communication pump 24 is turned off.

In this method, the condensing assembly is supplied with heat by a used energy supply unit, in particular with reference to the above description.

In summary, according to the present invention, when the condensation temperature of the refrigeration system 1 is detected to exceed the preset condensation temperature range, the energy supply unit provides the cooling capacity or the heat to the condenser, so that the condensation temperature is adjusted to be within the preset temperature range, and the refrigeration system 1 is ensured to normally operate or maintain the optimal operation state under any working condition.

The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention.

Claims (10)

1. The utility model provides a fresh-keeping case, includes storage tank and refrigerating system, refrigerating system includes refrigerating circuit and the refrigerating medium that is located refrigerating circuit, refrigerating circuit includes compressor, condensation subassembly, throttling element, evaporimeter, its characterized in that, the evaporimeter includes directly or indirectly give the storage tank is cold for first evaporimeter, directly or indirectly give the condensation subassembly is cold for second evaporimeter, first evaporation with the parallelly connected setting of second evaporimeter.

2. The fresh-keeping box according to claim 1, wherein: the first evaporator and the second evaporator are connected in parallel between the throttling element and the compressor;

or, the throttling element comprises a first throttling element and a second throttling element which are arranged in parallel, the first evaporator is connected between the first throttling element and the compressor, and the second evaporator is connected between the second throttling element and the compressor.

3. The fresh-keeping box according to claim 1, wherein: the first evaporator is arranged in the storage box;

or the first evaporator supplies cold to the storage box through a first cold supply unit; the first evaporator comprises a refrigerant channel and a secondary refrigerant channel, and the refrigerant channel is connected between the throttling element and the compressor; the first cooling unit comprises a heat exchanger, a first cooling pipe and a first cooling return pipe which are connected with the secondary refrigerant channel and the heat exchanger, a first circulating pump which is connected with the first cooling pipe or the first cooling return pipe, and secondary refrigerant which circularly flows in the secondary refrigerant channel, the first cooling pipe and the first cooling return pipe, wherein the heat exchanger is positioned in the storage box or is arranged in an air duct which is communicated with the storage box;

Or the first evaporator supplies cold to the storage box through a first cold supply unit; the first evaporator comprises a refrigerant channel and a secondary refrigerant channel, the refrigerant channel is connected between the throttling element and the compressor, the refrigeration system further comprises a cold storage box communicated with the secondary refrigerant channel through a circulating pipeline, an energy storage material is arranged in the cold storage box, and a circulating pump is arranged on the circulating pipeline; the first cooling unit comprises a heat exchanger, a first cooling pipe, a first cooling return pipe and a first circulating pump, wherein the first cooling pipe and the first cooling return pipe are connected with the cold storage box and the heat exchanger, the first circulating pump is connected to the first cooling pipe or the first cooling return pipe, and the heat exchanger is located in the storage box or arranged in an air duct communicated with the storage box.

4. The fresh-keeping box according to claim 1, wherein: the fresh-keeping box also comprises a condensation temperature management module for supplying the cold energy of the second evaporator to the condensation assembly, wherein the condensation temperature management module comprises a sensor for detecting the condensation temperature of the refrigerating system, an energy supply unit for transmitting the cold energy of the second evaporator to the condensation assembly, and a temperature control unit in communication connection with the sensor and the energy supply unit.

5. The fresh-keeping box according to claim 4, wherein: the second evaporator comprises a refrigerant channel and a secondary refrigerant channel, and the refrigerant channel is connected between the throttling element and the compressor; the condensing assembly includes a first fluid channel and a second fluid channel, the first fluid channel being connected between the compressor and the throttling element; the energy supply unit comprises a communicating pipe for communicating the second fluid channel with the secondary refrigerant channel, a communicating pump connected to the communicating pipe, and secondary refrigerant positioned in the secondary refrigerant channel, the communicating pipe and the second fluid channel.

6. The fresh-keeping box according to claim 4, wherein: the condensing assembly includes a first condenser; the energy supply unit comprises at least one fan arranged on one side of the first condenser and an energy storage unit for providing cold energy, wherein the energy storage unit comprises an energy storage container, an energy storage material arranged in the energy storage container, a radiator, an output pipe communicated with the energy storage container and an inlet of the radiator, a return pipe communicated with an outlet of the radiator and the energy storage container, and a transmission pump connected to the output pipe or the return pipe, the radiator is arranged on the air inlet side of the first condenser, the fan and the transmission pump are all in communication connection with the temperature control unit, and the second evaporator supplies cold to the energy storage material directly or indirectly.

7. The fresh-keeping box according to claim 4, wherein: the condensing assembly includes a second condenser including a first fluid passage and a second fluid passage, the first fluid passage being connected between an outlet of the compressor and an inlet of the throttling element; the energy supply unit comprises an energy storage unit communicated with the second fluid channel, the energy storage unit comprises an energy storage container, an energy storage material positioned in the energy storage container, an output pipe communicated with the energy storage container and an inlet of the second fluid channel, a return pipe communicated with an outlet of the second fluid channel and the energy storage container, and a transmission pump connected with the output pipe or the return pipe, the transmission pump is in communication connection with the temperature control unit, and the second evaporator directly or indirectly supplies cold to the energy storage material.

8. The fresh box according to claim 6 or 7, wherein: the second evaporator is positioned in the energy storage container;

or the second evaporator supplies cold energy to the energy storage material through a second cooling unit, and comprises a refrigerant channel and a secondary refrigerant channel, wherein the refrigerant channel is connected between the throttling element and the compressor; the second cooling unit comprises a second cooling pipe and a second cooling return pipe which are communicated with the secondary refrigerant channel and the energy storage container, a first cooling pump connected to the second cooling pipe or the second return pipe, and energy storage materials positioned in the secondary refrigerant channel, the second cooling pipe and the second cooling return pipe, wherein the first cooling pump is in communication connection with the temperature control unit; or the second cooling unit comprises a pair of cooling interfaces arranged on the energy storage container, a cooling pipe connected between the pair of cooling interfaces, a third cooling pipe and a third return pipe respectively connected with the pair of cooling interfaces and two ends of the secondary refrigerant channel, a second cooling pump connected to the third cooling pipe or the third return pipe, and secondary refrigerant positioned in the secondary refrigerant channel, the third circulation pipe and the cooling pipe, and the second cooling pump is in communication connection with the temperature control unit.

9. The fresh box according to claim 6 or 7, wherein: the phase transition temperature of the energy storage material is 845 ℃ below zero or 838 ℃ below zero, which is minus 48 ℃.

10. The fresh-keeping box according to claim 4, wherein:

the sensor comprises a pressure sensor for acquiring the pressure of the refrigerating medium, and the pressure sensor is arranged at any position of a refrigerating circuit between the outlet of the compressor and the inlet of the throttling element;

and/or the sensor comprises a temperature sensor used for acquiring the temperature of the refrigerating working medium, and the temperature sensor is positioned between the outlet of the second half part of the condensing assembly or the condensing assembly and the inlet of the throttling element;

and/or the sensor comprises a ring temperature sensor.

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