Refrigeration systems and refrigeration equipment

Abstract

This invention specifically relates to a refrigeration system and refrigeration equipment. The refrigeration system includes a first refrigeration system and a second refrigeration system. The first refrigeration system includes a high-temperature stage compressor, a condenser, a high-temperature stage cold storage device, a high-temperature stage throttling device, and an evaporator-condenser constituting a high-temperature stage refrigeration circuit. The second refrigeration system includes a low-temperature stage compressor, the aforementioned evaporator-condenser, the low-temperature stage cold storage device, the low-temperature stage throttling device, and a first evaporator constituting a low-temperature stage refrigeration circuit. The evaporator-condenser includes an evaporation section and a condensation section, which exchange heat with each other. The evaporation section is connected to the high-temperature stage refrigeration circuit, and the condensation section is connected to the low-temperature stage refrigeration circuit. This invention improves resource utilization and has the advantages of energy efficiency, high efficiency, compact structure, and high refrigeration efficiency.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to refrigeration systems and refrigeration equipment. Background Technology

[0002] Currently, in order to achieve ultra-low temperature refrigeration, cascade circulation or multi-stage compression circulation systems are generally used. The condensate is not subcooled or the subcooling degree is very small, resulting in low heat exchange. This has the disadvantages of low heat exchange efficiency, poor refrigeration effect, and inconvenience for long-distance transportation.

[0003] When the refrigeration system is running, the evaporator will frost up. Most refrigerators currently use an electric heating wire at the bottom of the evaporator for defrosting, which will cause the compartment temperature to rise and fluctuate greatly. When the electric heating wire is working, the compressor will stop running, which will further increase the compartment temperature. This has the disadvantages of poor cooling effect and low cooling efficiency.

[0004] Therefore, it is necessary to study a refrigeration system and refrigeration equipment to solve at least one of the above problems. Summary of the Invention

[0005] The present invention aims to provide a refrigeration system that is energy-efficient, compact in structure, and has high refrigeration efficiency.

[0006] To achieve the above objectives, one embodiment of the present invention provides a refrigeration system, comprising:

[0007] The first refrigeration system includes a high-temperature stage compressor, a condenser, a high-temperature stage cold storage device, a high-temperature stage throttling device, and an evaporator-condenser, which constitute a high-temperature stage refrigeration circuit.

[0008] The second refrigeration system includes a low-temperature stage compressor constituting a low-temperature stage refrigeration circuit, the aforementioned evaporator-condenser, a low-temperature stage cold storage device, a low-temperature stage throttling device, and a first evaporator;

[0009] The evaporator-condenser includes an evaporation section and a condensation section, which exchange heat with each other. The evaporation section is connected to a high-temperature refrigeration circuit, and the condensation section is connected to a low-temperature refrigeration circuit.

[0010] As a further improvement of one embodiment of the present invention, the second refrigeration system further includes an auxiliary evaporator connected between the low-temperature stage cold storage device and the low-temperature stage compressor; wherein,

[0011] The outlet of the high-temperature cold storage device is divided into two paths: one path connects to the high-temperature throttling device and the evaporation section, and the other path connects to the low-temperature cold storage device and the auxiliary evaporator.

[0012] As a further improvement of one embodiment of the present invention, the low-temperature stage compressor, the first evaporator, the low-temperature stage throttling device, the high-temperature stage cold storage device, the low-temperature stage cold storage device, and the auxiliary evaporator are connected in sequence to form a defrosting circuit.

[0013] As a further improvement of one embodiment of the present invention, the second refrigeration system further includes a four-way reversing valve, which has a first interface, a second interface, a third interface and a fourth interface.

[0014] The first interface connects to the outlet of the cryogenic compressor;

[0015] The second interface is divided into two paths: one path connects to the aforementioned condensation section, and the other path connects to the auxiliary evaporator.

[0016] The third interface connects to the first evaporator;

[0017] The fourth interface connects to the inlet of the cryogenic stage compressor.

[0018] As a further improvement of one embodiment of the present invention, the second refrigeration system further includes a first three-way valve connected between the four-way reversing valve and the condensing section. The first three-way valve has a fifth port, a sixth port and a seventh port, wherein the fifth port is connected to the aforementioned condensing section, the sixth port is connected to the auxiliary evaporator and the seventh port is connected to the second port.

[0019] As a further improvement of one embodiment of the present invention, the second refrigeration system further includes a second three-way valve connected between the low-temperature cold storage device and the low-temperature throttling device, wherein the second three-way valve has an eighth port, a ninth port and a tenth port, wherein the eighth port is connected to the low-temperature cold storage device, the ninth port is connected to the high-temperature cold storage device and the tenth port is connected to the low-temperature throttling device.

[0020] As a further improvement of one embodiment of the present invention, the cryogenic stage refrigeration circuit is turned on when the first interface is connected to the second interface, the third interface is connected to the fourth interface, the seventh interface is connected to the fifth interface, and the eighth interface is connected to the tenth interface.

[0021] As a further improvement of one embodiment of the present invention, the defrosting circuit is turned on when the first interface is connected to the third interface, the second interface is connected to the fourth interface, the sixth interface is connected to the seventh interface, and the tenth interface is connected to the ninth interface.

[0022] As a further improvement of one embodiment of the present invention, the low-temperature cold storage device includes a heat exchanger and a cold storage unit, wherein the aforementioned heat exchanger is a finned tube heat exchanger or a plate heat exchanger.

[0023] Another technical solution adopted in this invention is:

[0024] A refrigeration device, the refrigeration device comprising the refrigeration system as described above.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: The refrigeration system and refrigeration equipment of the present invention increase the subcooling after high-temperature condensation by adding a high-temperature stage cold storage device to the high-temperature stage refrigeration circuit, so that the high-temperature stage throttling device can cool down more quickly. Similarly, the low-temperature stage cold storage device in the low-temperature stage refrigeration circuit increases the subcooling after low-temperature condensation, so that the low-temperature stage throttling device can cool down more quickly, thereby improving heat exchange efficiency and thus improving refrigeration efficiency. At the same time, the high-temperature stage refrigeration circuit and the low-temperature stage refrigeration circuit are combined by setting up an evaporator-condenser, saving installation space and improving resource utilization. It has the advantages of energy saving, high efficiency, compact structure, and high refrigeration efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structural composition of the refrigeration system of the present invention;

[0027] Figure 2 This is a schematic diagram of the structural composition of the second refrigeration system of the ... present invention.

[0028] In the diagram: 11. High-temperature stage compressor; 12. Low-temperature stage compressor; 2. Condenser; 31. High-temperature stage cold storage device; 32. Low-temperature stage cold storage device; 41. High-temperature stage throttling device; 42. Low-temperature stage throttling device; 5. Evaporator-condenser; 51. Evaporation section; 52. Condensation section; 61. First evaporator; 62. Auxiliary evaporator; 7. Four-way reversing valve; 71. First port; 72. Second port; 73. Third port; 74. Fourth port; 8. First three-way valve; 81. Fifth port; 82. Sixth port; 83. Seventh port; 9. Second three-way valve; 91. Eighth port; 92. Ninth port; 93. Tenth port. Detailed Implementation

[0029] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0030] The terms "comprising" and "having," and any variations thereof, used in this invention are intended to cover non-exclusive inclusion. References to "embodiment" herein mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] This invention mainly relates to: a refrigeration device including a storage space and a refrigeration system, wherein the refrigeration system is used to refrigerate the storage space.

[0032] The refrigeration system includes a first refrigeration system and a second refrigeration system.

[0033] Combination Figure 1 As shown, in this embodiment, the first refrigeration system includes a high-temperature stage compressor 11, a condenser 2, a high-temperature stage cold storage device 31, a high-temperature stage throttling device 41, and an evaporator-condenser 5, which constitute a high-temperature stage refrigeration circuit. The refrigerant flows through the high-temperature stage cold storage device 31 to increase the subcooling after high-temperature stage condensation, so that the high-temperature stage throttling device 41 can cool down more quickly, thereby improving refrigeration efficiency.

[0034] The second refrigeration system includes a low-temperature stage compressor 12 constituting the low-temperature stage refrigeration circuit, the aforementioned evaporator-condenser 5, a low-temperature stage cold storage device 32, a low-temperature stage throttling device 42, and a first evaporator 61. The refrigerant flows through the low-temperature stage cold storage device 32 to increase the subcooling after low-temperature stage condensation, so that the low-temperature stage throttling device 42 can cool down more quickly, thereby improving refrigeration efficiency.

[0035] The evaporator-condenser 5 includes an adjacent evaporation section 51 and a condensation section 52, which exchange heat with each other. The evaporation section 51 is connected to the high-temperature refrigeration circuit, and the condensation section 52 is connected to the low-temperature refrigeration circuit. The evaporator-condenser 5 functions as both evaporator in the high-temperature refrigeration circuit and condenser in the low-temperature refrigeration circuit, thus saving installation space, improving resource utilization, and offering advantages in energy saving and high efficiency.

[0036] Specifically, after being discharged from the outlet of the high-temperature compressor 11, the refrigerant flows sequentially through the condenser 2, the high-temperature cold storage device 31, the high-temperature throttling device 41, and the evaporation section 51 before returning to the inlet of the high-temperature compressor 11 to complete the high-temperature refrigeration cycle.

[0037] After being discharged from the exhaust port of the low-temperature compressor 12, the refrigerant flows sequentially through the condensing section 52, the low-temperature cold storage device 32, the low-temperature throttling device 42, and the first evaporator 61 before returning to the intake end of the low-temperature compressor 12 to complete the low-temperature refrigeration cycle of the cascade refrigeration system.

[0038] Preferably, both the high-temperature throttling device 41 and the low-temperature throttling device 42 are provided as capillary tubes or throttling valves to achieve the purpose of throttling and reducing pressure.

[0039] Preferably, both the evaporation section 51 and the condensation section 52 can be adjacent tubular structures, which have the advantages of low operating power and low power consumption.

[0040] Furthermore, the second refrigeration system also includes an auxiliary evaporator 62 connected between the low-temperature stage cold storage device 32 and the low-temperature stage compressor 12; wherein, the outlet end of the high-temperature stage cold storage device 31 is divided into two paths, one path connecting to the high-temperature stage throttling device 41 and the evaporation section 51 to form a high-temperature stage refrigeration circuit. The other path connects to the low-temperature stage cold storage device 32 and the auxiliary evaporator 62. This has the advantages of easy switching and convenient implementation.

[0041] Furthermore, the low-temperature compressor 12, the first evaporator 61, the low-temperature throttling device 42, the high-temperature cold storage device 31, the low-temperature cold storage device 32, and the auxiliary evaporator 62 are sequentially connected to form a defrosting circuit. When the first evaporator 61 needs defrosting, the high-temperature refrigeration circuit is temporarily not in operation. After the refrigerant is discharged from the outlet of the low-temperature compressor 12, it flows sequentially through the first evaporator 61, the low-temperature throttling device 42, the high-temperature cold storage device 31, the low-temperature cold storage device 32, and the auxiliary evaporator 62 before returning to the inlet of the low-temperature compressor 12 to complete the reverse defrosting cycle. The refrigerant is discharged as high-temperature, high-pressure gas by the low-temperature compressor 12, and releases heat through the first evaporator 61. The first evaporator 61 defrosts in the defrosting circuit. While the first evaporator 61 is defrosting, the auxiliary evaporator 62 can provide cooling for the storage space.

[0042] Furthermore, the storage space comprises multiple compartments, with both the first evaporator 61 and the auxiliary evaporator 62 providing cooling or heating to the same compartment. The auxiliary evaporator 62 is only activated during defrosting, allowing the auxiliary evaporator 62 to provide cooling to the compartment while the first evaporator 61 is defrosting. The defrosting circuit operates independently, ensuring that the cooling effect of the compartment is not affected while the first evaporator 61 is defrosting.

[0043] Combination Figure 2 As shown, in order to facilitate switching between the refrigeration mode of the low-temperature refrigeration circuit and the defrosting mode of the defrosting circuit, the second refrigeration system also includes a four-way reversing valve 7, which has a first port 71, a second port 72, a third port 73 and a fourth port 74.

[0044] The first interface 71 is connected to the outlet end of the low-temperature stage compressor 12;

[0045] The second interface 72 splits into two paths, one of which connects to the aforementioned condenser section 52, and the other connects to the auxiliary evaporator 62;

[0046] The third interface 73 is connected to the first evaporator 61;

[0047] The fourth interface 74 is connected to the air inlet of the cryogenic compressor 12.

[0048] Furthermore, the second refrigeration system also includes a first three-way valve 8 connected between the four-way reversing valve 7 and the condensing section 52. The first three-way valve 8 has a fifth port 81, a sixth port 82, and a seventh port 83. The fifth port 81 is connected to the aforementioned condensing section 52, the sixth port 82 is connected to the auxiliary evaporator 62, and the seventh port 83 is connected to the second port 72. The combination of the four-way reversing valve 7 and the first three-way valve 8 allows for switching between the low-temperature refrigeration circuit and the defrosting circuit, offering advantages in terms of ease of switching and control.

[0049] Furthermore, the second refrigeration system also includes a second three-way valve 9 connected between the low-temperature stage cold storage device 32 and the low-temperature stage throttling device 42. The second three-way valve 9 has an eighth port 91, a ninth port 92, and a tenth port 93. The eighth port 91 connects to the low-temperature stage cold storage device 32, the ninth port 92 connects to the high-temperature stage cold storage device 31, and the tenth port 93 connects to the low-temperature stage throttling device 42. Through the combined arrangement of the four-way reversing valve 7, the first three-way valve 8, and the second three-way valve 9, the purpose of precisely controlling and switching the low-temperature stage refrigeration circuit and the defrosting circuit can be achieved, offering advantages such as ease of control and cost reduction.

[0050] Furthermore, when the first interface 71 is connected to the second interface 72, the third interface 73 to the fourth interface 74, the seventh interface 83 to the fifth interface 81, and the eighth interface 91 to the tenth interface 93, the low-temperature stage refrigeration circuit is activated. The refrigerant, discharged from the exhaust port of the low-temperature stage compressor 12, flows sequentially through the first interface 71, the second interface 72, the seventh interface 83, the fifth interface 81, the condensing section 52, the low-temperature stage cold storage device 32, the eighth interface 91, the tenth interface 93, the low-temperature stage throttling device 42, the first evaporator 61, the third interface 73, and the fourth interface 74 before returning to the intake end of the low-temperature stage compressor 12 to complete the low-temperature stage refrigeration cycle of the cascade refrigeration system. This achieves the purpose of switching to the low-temperature stage refrigeration circuit, offering advantages in terms of ease of switching and control.

[0051] Furthermore, when the first interface 71 is connected to the third interface 73, the second interface 72 to the fourth interface 74, the sixth interface 82 to the seventh interface 83, and the tenth interface 93 to the ninth interface 92, the defrosting circuit is activated. After being discharged from the outlet of the low-temperature compressor 12, the refrigerant flows sequentially through the first interface 71, the third interface 73, the first evaporator 61, the low-temperature throttling device 42, the tenth interface 93, the ninth interface 92, the high-temperature cold storage device 31, the low-temperature cold storage device 32, the auxiliary evaporator 62, the sixth interface 82, the seventh interface 83, the second interface 72, and the fourth interface 74 before returning to the inlet of the low-temperature compressor 12 to complete the reverse defrosting cycle. This achieves the purpose of switching to the defrosting circuit and has the advantages of easy switching and control.

[0052] Furthermore, the low-temperature cold storage device 32 includes a heat exchanger and a cold storage unit, wherein the aforementioned heat exchanger is a finned tube heat exchanger or a plate heat exchanger. It can be understood that the high-temperature cold storage device 31 has the same structural form as the low-temperature cold storage device 32, and the cold storage unit is equipped with cold storage material for condensing refrigerant.

[0053] Compared to existing technologies, the refrigeration system and equipment of this invention increase the subcooling after high-temperature condensation by adding a high-temperature stage cold storage device 31 to the high-temperature stage refrigeration circuit, thus facilitating faster cooling of the high-temperature stage throttling device 41. Similarly, the low-temperature stage cold storage device 32 in the low-temperature stage refrigeration circuit increases the subcooling after low-temperature condensation, facilitating faster cooling of the low-temperature stage throttling device 42, thereby improving heat exchange efficiency and ultimately enhancing refrigeration efficiency. Furthermore, the combination of the high-temperature and low-temperature refrigeration circuits through the evaporator-condenser 5 saves installation space and improves resource utilization, resulting in advantages such as energy efficiency, high efficiency, compact structure, and high refrigeration efficiency.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A refrigeration system, characterized in that, include: The first refrigeration system includes a high-temperature stage compressor, a condenser, a high-temperature stage cold storage device, a high-temperature stage throttling device, and an evaporator-condenser, which constitute a high-temperature stage refrigeration circuit. The second refrigeration system includes a low-temperature stage compressor constituting a low-temperature stage refrigeration circuit, the aforementioned evaporator-condenser, a low-temperature stage cold storage device, a low-temperature stage throttling device, and a first evaporator; The evaporator-condenser includes an evaporation section and a condensation section, which exchange heat with each other. The evaporation section is connected to a high-temperature refrigeration circuit, and the condensation section is connected to a low-temperature refrigeration circuit. The second refrigeration system further includes an auxiliary evaporator connected between the low-temperature stage cold storage device and the low-temperature stage compressor; wherein, The outlet of the high-temperature cold storage device is divided into two paths: one path connects to the high-temperature throttling device and the evaporation section, and the other path connects to the low-temperature cold storage device and the auxiliary evaporator. The low-temperature stage compressor, the first evaporator, the low-temperature stage throttling device, the high-temperature stage cold storage device, and the auxiliary evaporator are connected in sequence to form a defrosting circuit; The second refrigeration system also includes a four-way reversing valve, which has a first port, a second port, a third port and a fourth port; The first interface connects to the outlet of the cryogenic compressor; The second interface is divided into two paths: one path connects to the aforementioned condensation section, and the other path connects to the auxiliary evaporator. The third interface connects to the first evaporator; The fourth interface connects to the inlet of the cryogenic stage compressor; The second refrigeration system further includes a first three-way valve connected between the four-way reversing valve and the condensing section. The first three-way valve has a fifth port, a sixth port and a seventh port, wherein the fifth port is connected to the aforementioned condensing section, the sixth port is connected to the auxiliary evaporator and the seventh port is connected to the second port. The second refrigeration system further includes a second three-way valve connected between the low-temperature cold storage device and the low-temperature throttling device. The second three-way valve has an eighth port, a ninth port, and a tenth port. The eighth port is connected to the low-temperature cold storage device, the ninth port is connected to the high-temperature cold storage device, and the tenth port is connected to the low-temperature throttling device.

2. The refrigeration system according to claim 1, characterized in that: When the first interface is connected to the second interface, the third interface is connected to the fourth interface, the seventh interface is connected to the fifth interface, and the eighth interface is connected to the tenth interface, the cryogenic stage refrigeration circuit is turned on.

3. The refrigeration system according to claim 1, characterized in that: The defrosting circuit is activated when the first interface is connected to the third interface, the second interface is connected to the fourth interface, the sixth interface is connected to the seventh interface, and the tenth interface is connected to the ninth interface.

4. The refrigeration system according to claim 1, characterized in that: The cryogenic cold storage device includes a heat exchanger and a cold storage unit, wherein the aforementioned heat exchanger is a finned tube heat exchanger or a plate heat exchanger.

5. A refrigeration device, characterized in that: The refrigeration equipment includes the refrigeration system as described in any one of claims 1-4.

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