CN212205125U - Cascade compression refrigeration system and have its cold-stored refrigeration device - Google Patents
Cascade compression refrigeration system and have its cold-stored refrigeration device Download PDFInfo
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- CN212205125U CN212205125U CN202020377462.6U CN202020377462U CN212205125U CN 212205125 U CN212205125 U CN 212205125U CN 202020377462 U CN202020377462 U CN 202020377462U CN 212205125 U CN212205125 U CN 212205125U
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Abstract
The utility model provides a cascade compression refrigerating system and have its cold-stored refrigerating plant, cascade compression refrigerating system is including the high temperature level refrigeration cycle return circuit that is used for circulating first refrigerant and the low temperature level refrigeration cycle return circuit that is used for circulating the second refrigerant. The high-temperature-stage refrigeration cycle loop comprises an evaporation part, and the low-temperature-stage refrigeration cycle loop comprises a low-temperature-stage compressor, a heat release part, a condensation part, a low-temperature-stage evaporator, a heat absorption part and an expansion device. The evaporation section is thermally connected to the condensation section. The heat releasing part is arranged between the discharge port of the low-temperature stage compressor and the condensing part, the heat absorbing part is arranged between the low-temperature stage evaporator and the suction port of the low-temperature stage compressor, and the heat releasing part is thermally connected with the heat absorbing part. The expansion device comprises a throttling device and an expansion container. The throttling device is arranged between the low-temperature-stage evaporator and the expansion container. The expansion vessel is provided between the throttle device and the heat radiating section. The suction temperature of the low-temperature stage compressor is increased, and the load of the evaporation part can be reduced.
Description
Technical Field
The utility model relates to a refrigeration field especially relates to a cascade compression refrigerating system and have its cold-stored refrigerating plant.
Background
At present, the temperature range of the temperature-changing chamber of the refrigerator on the market is adjusted between 8 ℃ and 18 ℃ below zero, and the overall design is more conventional. Along with the gradual promotion of people's standard of living, this kind of warm area refrigerator can not satisfy everybody's demand well, need design the temperature range wider, and the function is more complete, can satisfy the high-end refrigerator of more demands of user, to the save of special precious edible material, exists the demand to the ultra-low temperature compartment in the high-end user market, -60 ℃ basically covers daily meat and melon and fruit vegetables glass state optimum save temperature, provides probably for eating the material to keep fresh for a long time and store.
SUMMERY OF THE UTILITY MODEL
In order to meet the market demand, the inventor provides a two-stage cascade system as a basis, and an independent refrigerating system is adopted for refrigerating the variable-temperature chamber, so that the variable-temperature chamber can reach the ultralow temperature, and the diversified demands of users are met. However, the inventor finds that the compressor is over-quickly heated due to the large load and high heat of the low-temperature compressor, and the compressor is easy to protect. Based on this, the utility model provides a cascade compression refrigeration system and have its cold-stored refrigeration plant who solves above-mentioned problem at least partially.
In one aspect, the present invention provides a cascade compression refrigeration system, comprising a high temperature refrigeration cycle for circulating a first refrigerant and a low temperature refrigeration cycle for circulating a second refrigerant;
the high-temperature-stage refrigeration circulation loop comprises an evaporation part, and the low-temperature-stage refrigeration circulation loop comprises a low-temperature-stage compressor, a heat release part, a condensation part, a low-temperature-stage evaporator, a heat absorption part and an expansion device;
the evaporation part is thermally connected with the condensation part, so that the first refrigerant absorbs heat released by the second refrigerant when flowing through the condensation part when flowing through the evaporation part;
the heat radiating part is arranged between a discharge port of the low-temperature stage compressor and the condensing part, the heat absorbing part is arranged between the low-temperature stage evaporator and a suction port of the low-temperature stage compressor, and the heat radiating part is thermally connected with the heat absorbing part so that the second refrigerant entering the heat absorbing part absorbs heat released by the second refrigerant entering the heat radiating part when the second refrigerant flows;
the expansion device comprises a throttling device and an expansion container; the throttling device is arranged between the low-temperature-stage evaporator and the expansion container, or the throttling device is arranged between the heat absorption part and the expansion container; the expansion vessel is provided between the throttling device and the heat radiating portion, or the expansion vessel is provided between the throttling device and the condensing portion.
Optionally, the low temperature stage refrigeration cycle further includes a plate heat exchanger having the heat absorption portion and the heat release portion.
Optionally, the restriction device is a pressure reducing valve.
Optionally, the evaporation part and the condensation part are integrally formed into a condensation evaporator;
the evaporation part comprises an evaporation pipe, the condensation part comprises a condensation pipe, the condensation evaporator further comprises fins, and the evaporation pipe and the condensation pipe are mounted on the fins.
Optionally, the evaporation portion is disposed below the condensation portion, and a refrigerant volume of the evaporation portion is larger than a refrigerant volume of the condensation portion.
Optionally, the high-temperature stage refrigeration cycle further comprises a high-temperature stage compressor and a high-temperature stage evaporator,
the outlet of the high-temperature-stage evaporator and the outlet of the evaporation part are both communicated with the suction inlet of the high-temperature-stage compressor; or
The outlet of the evaporation part is communicated with the suction inlet of the high-temperature stage compressor, and the outlet of the high-temperature stage evaporator is communicated with the inlet of the evaporation part.
On the other hand, the utility model also provides a cold-stored refrigeration plant, including any kind of cascade compression refrigerating system of the aforesaid.
Optionally, the refrigerating and freezing device further comprises a box body, and a storage chamber is arranged in the box body;
when the target temperature of the storage chamber is lower than the preset temperature, the high-temperature refrigeration circulation loop is firstly opened, the evaporation part supplies cold energy to the storage chamber, so that the temperature of the storage chamber reaches the preset temperature, and then the high-temperature refrigeration circulation loop and the low-temperature refrigeration circulation loop are both opened, so that the low-temperature evaporator supplies cold energy to the storage chamber, and the temperature of the storage chamber reaches the target temperature.
Optionally, the refrigerating and freezing device comprises a box body, and a first storage chamber and a second storage chamber are arranged in the box body; and is
The evaporation part is configured to provide cold for the first storage chamber and/or provide cold for the second storage chamber;
the low-temperature-stage evaporator is configured to provide cold to the second storage compartment.
Optionally, a third storage compartment is further disposed in the box, and the high-temperature evaporator is configured to provide cold energy into the third storage compartment.
The utility model discloses an among cascade compression refrigerating system and the cold-stored refrigeration device who has it, because have the heat absorption portion, exothermic portion and expansion device, the heat absorption portion is used for making the second refrigerant that flows through it absorb the heat of the second refrigerant of exothermic portion of flow through, make the second refrigerant in the low temperature level refrigeration cycle return circuit rise temperature before flowing into the compressor sunction inlet, and make the second refrigerant get into and suitably lower the temperature between the condensing part, thereby can improve the inspiratory temperature of low temperature level compressor, can reduce the load of evaporation part, protect low temperature level compressor, the system efficiency is improved. The expansion container can prevent the low-temperature compressor from being damaged due to overlarge pressure difference during starting, and can ensure the pressure difference during shutdown, and the pressure reducing valve is arranged to maintain the pressure difference.
Further, the utility model discloses an among cascade compression refrigerating system and the cold-stored refrigerating plant who has it, adopt independent refrigerating system to give the alternating temperature compartment refrigeration, realize that the alternating temperature compartment can reach extremely low temperature, also can set to conventional warm area when not needing the ultra-low temperature warm area simultaneously, satisfy user diversified demand.
Further, the utility model discloses an among cascade compression refrigerating system and the cold-stored refrigerating plant who has it, when setting up to the ultra-low temperature, need through high temperature level refrigerating system with alternating temperature room precooling to-18 ℃ after for reducing the energy consumption, close the alternating temperature air door, open low temperature level refrigerating system again, refrigerate alternating temperature room alone.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
figure 1 is a schematic diagram of a cascade compression refrigeration system according to an embodiment of the present invention;
figure 2 is a schematic diagram of a cascade compression refrigeration system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a condensing evaporator in the cascade compression refrigeration system of FIG. 2;
figure 4 is a schematic view of a refrigeration and freezing apparatus according to an embodiment of the present invention;
fig. 5 is a schematic view of a refrigeration and freezing apparatus according to an embodiment of the present invention.
Detailed Description
Figure 1 is a schematic diagram of a cascade compression refrigeration system according to an embodiment of the present invention. As shown in fig. 1, the present invention provides a cascade compression refrigeration system, which includes a high-temperature stage refrigeration cycle circuit for circulating a first refrigerant and a low-temperature stage refrigeration cycle circuit for circulating a second refrigerant. The high-temperature stage refrigeration cycle includes an evaporation portion 31, and the low-temperature stage refrigeration cycle includes a low-temperature stage compressor 41, a heat radiation portion, a condensation portion 32, a low-temperature stage evaporator 43, a heat absorption portion, and an expansion device. The evaporation portion 31 is thermally connected to the condensation portion 32 such that the first refrigerant absorbs heat released by the second refrigerant when flowing through the condensation portion 32 when flowing through the evaporation portion 31. That is, the second refrigerant of the low-temperature stage refrigeration cycle circuit is condensed using the cold energy generated from the high-temperature stage refrigeration cycle circuit to make the low-temperature stage evaporator 43 at an ultra-low temperature.
The heat radiating portion is disposed between the discharge port of the low-temperature stage compressor 41 and the condensing portion 32, the heat absorbing portion is disposed between the low-temperature stage evaporator 43 and the suction port of the low-temperature stage compressor 41, and the heat radiating portion is thermally connected to the heat absorbing portion so that the second refrigerant entering the heat absorbing portion absorbs heat released from the second refrigerant entering the heat radiating portion when the second refrigerant flows. The heat radiating part and the heat absorbing part enable the second refrigerant in the low-temperature stage refrigeration cycle loop to be heated before flowing into the suction inlet of the compressor, and enable the second refrigerant to enter the space between the condensing parts 32 to be properly cooled, so that the suction temperature of the low-temperature stage compressor 41 can be improved, the load of the evaporation part 31 can be reduced, the low-temperature stage compressor 41 is protected, and the system efficiency is improved.
The expansion means comprise a throttle means 45 and an expansion vessel 46. An inlet of the throttling device 45 is disposed on a pipeline between an outlet of the low-temperature-stage evaporator 43 and a suction inlet of the low-temperature-stage compressor 41, an inlet of the expansion container 46 is communicated with an outlet of the throttling device 45, and an outlet of the expansion container 46 is disposed on a pipeline between a discharge outlet of the low-temperature-stage compressor 41 and an inlet of the condensing portion 42. For example, the throttling device 45 is provided between the outlet of the low-temperature stage evaporator 43 and the expansion vessel 46, or the throttling device 45 is provided between the outlet of the heat absorbing portion and the expansion vessel 46. The expansion tank 46 is provided between the throttle device 45 and the heat radiating portion, or the expansion tank 46 is provided between the throttle device 45 and the inlet of the condensing portion 32. The throttling means 45 is preferably a pressure reducing valve, alternatively the throttling means 45 may be another type of throttling means. The expansion vessel 46 prevents excessive pressure differential during start-up of the low temperature stage compressor 41, which could damage the compressor, while at the same time, ensures a pressure differential during shutdown, and the pressure relief valve maintains the pressure differential.
In some embodiments of the present invention, as shown in fig. 1, the high-temperature stage refrigeration cycle further includes a high-temperature stage compressor 21, a condenser 22, a high-temperature stage evaporator 25, and a high-temperature stage throttling device. The outlet of the evaporation unit 31 communicates with the suction port of the high-temperature-stage compressor 21, and the outlet of the high-temperature-stage evaporator 25 communicates with the inlet of the evaporation unit 31. The high-temperature stage throttling device may be disposed on the inlet side of the high-temperature stage evaporator 25. Further, the high-temperature stage throttling means may be two, a first throttling means provided on the inlet side of the high-temperature stage evaporator 25, and a second throttling means provided on the inlet side of the evaporation portion 31. The outlet of the high-temperature stage evaporator 25 communicates with the inlet of the evaporation portion 31 through a second throttling device.
In other embodiments, as shown in fig. 1, the outlet of the evaporator portion 31 communicates with the suction port of the high-temperature-stage compressor 21, and the outlet of the high-temperature-stage evaporator 25 communicates with the inlet of the evaporator portion 31. The high-temperature stage throttling devices are two, and each is a first throttling device 24 provided on the inlet side of the high-temperature stage evaporator 25 and a second throttling device 26 provided on the inlet side of the evaporation portion 31. And the outlet of the high-temperature stage evaporator 25 and the outlet of the second throttling device 26 are both communicated with the inlet of the evaporation portion 31. The inlets of the first and second throttling devices 24, 26 are connected to the outlet of the condenser 22 through a control valve 23. The control valve 23 may alternatively direct the first refrigerant to the first throttling device 24, or the second throttling device 26, or direct the first refrigerant to both the first throttling device 24 and the second throttling device 26.
In still other embodiments, the outlet of the high temperature stage evaporator 25 and the outlet of the evaporator section 31 are both in communication with the suction inlet of the high temperature stage compressor 21. The high-temperature stage throttling devices are two, and are respectively a first throttling device arranged on the inlet side of the high-temperature stage evaporator 25 and a second throttling device arranged on the inlet side of the evaporation part 31, and inlets of the first throttling device and the second throttling device are connected to an outlet of the condenser 22 through control valves. The control valve may alternatively direct the first refrigerant to the first throttling device, or to the second throttling device, or to direct the first refrigerant to both the first throttling device and the second throttling device.
Further, as shown in fig. 2, the first throttling device 24 and the second throttling device 26 are both capillary tubes. A dew-removing pipe 27 is also provided between the condenser 22 and the control valve 23. The low-temperature-stage refrigeration cycle further includes a low-temperature-stage throttling device 42 provided between the condensing portion 32 and the low-temperature-stage evaporator 43. The expansion device in fig. 2 may be located inside the low temperature stage compressor 41. Preferably, the expansion device may be disposed outside the low temperature stage compressor 41.
In some embodiments of the present invention, the low temperature stage refrigeration cycle further includes a plate heat exchanger 44 having a heat absorption portion and a heat release portion. That is, the plate heat exchanger 44 is provided in the low-temperature-stage refrigeration cycle circuit so as to facilitate heat transfer between the heat absorbing portion and the heat radiating portion. In some alternative embodiments of the present invention, the heat transfer can be performed in a winding manner, and the heat absorbing portion and the heat releasing portion are both refrigerant tubes, so that the heat absorbing portion can be wound on the heat releasing portion.
In some embodiments of the present invention, as shown in fig. 2 and 3, the evaporation portion 31 and the condensation portion 32 are integrally formed as a condensation evaporator 30. The evaporation part 31 includes an evaporation tube, the condensation part 32 includes a condensation tube, the condensation evaporator 30 further includes a fin 33, and the evaporation tube and the condensation tube are mounted on the fin 33. Further, the evaporation portion 31 is disposed below the condensation portion 32, and a refrigerant volume of the evaporation portion 31 is larger than a refrigerant volume of the condensation portion 32. Specifically, the condenser-evaporator 30 is arranged to have 3 rows of tubes in the vertical direction, and two tubes are arranged in and out of the condenser-evaporator, the upper row of tubes is a condensation portion 32, and a second refrigerant of the low-temperature-stage refrigeration cycle loop flows inside the upper row of tubes; the lower two rows of tubes are the evaporator 31 and carry the first refrigerant of the high-temperature stage refrigeration cycle. When the deep cooling mode is started, the lower two rows of evaporation parts 31 cool the upper row of condensation parts 32, so that the condensation temperature of the low-temperature-stage refrigeration cycle loop is reduced, and the refrigeration capacity of the low-temperature-stage evaporator 43 is improved.
Fig. 4 is a schematic view of a refrigeration and freezing apparatus according to an embodiment of the present invention. As shown in fig. 4, an embodiment of the present invention further provides a refrigeration and freezing apparatus, which includes the cascade compression refrigeration system in any of the above embodiments. The refrigerator-freezer may be a small refrigerator-freezer for home use for storing foodstuffs, pharmaceuticals or other items, for example, a refrigerator, or freezer.
In some embodiments of the present invention, the refrigerating and freezing device further includes a box 50, and a storage compartment, such as a second storage compartment 52, is disposed in the box 50. When the target temperature of the storage chamber is lower than the preset temperature, the high-temperature refrigeration cycle loop is firstly opened, the evaporation part 31 supplies cold energy to the storage chamber, so that the temperature of the storage chamber reaches the preset temperature, and then the high-temperature refrigeration cycle loop and the low-temperature refrigeration cycle loop are both opened, so that the low-temperature evaporator 43 supplies cold energy to the storage chamber, so that the temperature of the storage chamber reaches the target temperature. That is to say, the utility model discloses an among the cold-stored refrigerating plant, when setting up to the ultra-low temperature, need through high temperature level refrigerating system with alternating temperature room precooling to-18 ℃ after for reducing the energy consumption, close the alternating temperature air door, open low temperature level refrigerating system again, refrigerate alternating temperature room alone. The preset temperature can be-18 ℃, and the corresponding preset temperature can also be set according to the capacity of the high-temperature-stage refrigeration cycle loop. When the storage chamber is set to be at the conventional temperature, the high-temperature refrigeration circulation loop is adopted to refrigerate the storage chamber through the conventional air duct. When the condenser-evaporator 30 is defrosted, the low-temperature stage compressor 41 may be stopped, and when the temperature of the condenser-evaporator 30 reaches the start-up temperature, the low-temperature stage compressor 41 may be restarted.
In some embodiments of the present invention, as shown in fig. 4 and 5, a first storage compartment 51, a second storage compartment 52 and a duct air door system are disposed in the box 50. The evaporation portion 31 is configured to provide cold to the first storage compartment 51 and/or cold to the second storage compartment 52. The low-temperature stage evaporator 43 is configured to provide cooling energy to the second storage compartment 52. The first storage compartment 51 may be a freezing compartment and the second storage compartment 52 may be a temperature-variable compartment. The ultra-low temperature control of the second storage compartment 52 may be performed by the low-temperature refrigeration cycle, or by the high-temperature refrigeration cycle, which is pre-cooled to a predetermined temperature, and then the low-temperature refrigeration cycle is turned on. Further, a third storage compartment 53 is provided in the box 50, and the high-temperature-stage evaporator 25 of the cascade compression refrigeration system is configured to supply cold energy into the third storage compartment 53. The third storage compartment 53 may be a refrigerator compartment. An independent refrigerating system is adopted to refrigerate the variable-temperature chamber, the variable-temperature chamber can reach the ultralow temperature, and meanwhile, the variable-temperature chamber can be set to be a conventional temperature zone when the ultralow temperature zone is not needed, so that the diversified requirements of users are met. The condenser-evaporator 30 can be disposed at the bottom of the box 50, that is, the bottom of the condenser-evaporator 30 is disposed at the lower portion of the first storage compartment 51. The low-temperature stage evaporator 43 and the high-temperature stage evaporator 25 may be respectively disposed at the rear portions of the respective storage compartments. Alternatively, the condensing evaporator 30, the low-temperature stage evaporator 43, and the high-temperature stage evaporator 25 may be respectively disposed at the rear of the corresponding storage compartments.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A cascade compression refrigeration system includes a high-temperature stage refrigeration cycle circuit for circulating a first refrigerant and a low-temperature stage refrigeration cycle circuit for circulating a second refrigerant; it is characterized in that the preparation method is characterized in that,
the high-temperature-stage refrigeration circulation loop comprises an evaporation part, and the low-temperature-stage refrigeration circulation loop comprises a low-temperature-stage compressor, a heat release part, a condensation part, a low-temperature-stage evaporator, a heat absorption part and an expansion device;
the evaporation part is thermally connected with the condensation part, so that the first refrigerant absorbs heat released by the second refrigerant when flowing through the condensation part when flowing through the evaporation part;
the heat radiating part is arranged between a discharge port of the low-temperature stage compressor and an inlet of the condensing part, the heat absorbing part is arranged between an outlet of the low-temperature stage evaporator and a suction port of the low-temperature stage compressor, and the heat radiating part is thermally connected with the heat absorbing part so that the second refrigerant entering the heat absorbing part absorbs heat released by the second refrigerant entering the heat radiating part when the second refrigerant flows;
the expansion device comprises a throttling device and an expansion container; the inlet of the throttling device is arranged on a pipeline between the outlet of the low-temperature-stage evaporator and the suction inlet of the low-temperature-stage compressor, the inlet of the expansion container is communicated with the outlet of the throttling device, and the outlet of the expansion container is arranged on a pipeline between the discharge outlet of the low-temperature-stage compressor and the inlet of the condensing part.
2. The cascade compression refrigeration system of claim 1, wherein the low temperature stage refrigeration cycle further comprises a plate heat exchanger having the heat absorption portion and the heat release portion.
3. The cascade compression refrigeration system of claim 1 wherein the throttling device is a pressure relief valve.
4. The cascade compression refrigeration system of claim 1,
the evaporation part and the condensation part are integrally formed into a condensation evaporator;
the evaporation part comprises an evaporation pipe, the condensation part comprises a condensation pipe, the condensation evaporator further comprises fins, and the evaporation pipe and the condensation pipe are mounted on the fins.
5. The cascade compression refrigeration system according to claim 1 or 4,
the evaporation part is arranged on the lower side of the condensation part, and the refrigerant volume of the evaporation part is larger than that of the condensation part.
6. The cascade compression refrigeration system of claim 1, wherein the high temperature stage refrigeration cycle further comprises a high temperature stage compressor and a high temperature stage evaporator,
the outlet of the high-temperature-stage evaporator and the outlet of the evaporation part are both communicated with the suction inlet of the high-temperature-stage compressor; or
The outlet of the evaporation part is communicated with the suction inlet of the high-temperature stage compressor, and the outlet of the high-temperature stage evaporator is communicated with the inlet of the evaporation part.
7. A refrigerated freezing apparatus comprising a cascade compression refrigeration system according to any one of claims 1 to 6.
8. A cold storage and refrigeration device as recited in claim 7 further comprising a cabinet, said cabinet having a storage compartment therein;
when the target temperature of the storage chamber is lower than the preset temperature, the high-temperature refrigeration circulation loop is firstly opened, the evaporation part supplies cold energy to the storage chamber, so that the temperature of the storage chamber reaches the preset temperature, and then the high-temperature refrigeration circulation loop and the low-temperature refrigeration circulation loop are both opened, so that the low-temperature evaporator supplies cold energy to the storage chamber, and the temperature of the storage chamber reaches the target temperature.
9. A cold storage and freezing device as claimed in claim 7, further comprising a box body, wherein a first storage chamber and a second storage chamber are arranged in the box body; and is
The evaporation part is configured to provide cold for the first storage chamber and/or provide cold for the second storage chamber;
the low-temperature-stage evaporator is configured to provide cold to the second storage compartment.
10. A refrigerator-freezer according to claim 9,
and a third storage compartment is further arranged in the box body, and a high-temperature-stage evaporator of the cascade compression refrigeration system is configured to provide cold energy into the third storage compartment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020377462.6U CN212205125U (en) | 2020-03-23 | 2020-03-23 | Cascade compression refrigeration system and have its cold-stored refrigeration device |
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| CN202020377462.6U CN212205125U (en) | 2020-03-23 | 2020-03-23 | Cascade compression refrigeration system and have its cold-stored refrigeration device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116358204A (en) * | 2023-03-31 | 2023-06-30 | 珠海格力电器股份有限公司 | Compressor control method, storage box and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116358204A (en) * | 2023-03-31 | 2023-06-30 | 珠海格力电器股份有限公司 | Compressor control method, storage box and storage medium |
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