CN109210814B

CN109210814B - Multifunctional refrigerating system

Info

Publication number: CN109210814B
Application number: CN201811175186.9A
Authority: CN
Inventors: 杨永安; 李瑞申; 严雷
Original assignee: Lingao Tianjin Science And Technology Application Research Co ltd; Xinjiang Tianfeng Agricultural Technology Co ltd; Tianjin University of Commerce
Current assignee: Lingao Tianjin Science And Technology Application Research Co ltd; Xinjiang Tianfeng Agricultural Technology Co ltd; Tianjin University of Commerce
Filing date: 2018-10-10
Publication date: 2024-07-09
Anticipated expiration: 2038-10-10

Abstract

The invention discloses a multifunctional refrigeration system, and aims to provide a multifunctional refrigeration system formed by splicing a plurality of refrigeration modules. The system comprises a first refrigeration unit and a second refrigeration unit, wherein the first refrigeration unit and the second refrigeration unit respectively comprise a plurality of refrigeration modules with the same structure; each refrigerating module comprises a refrigerating compressor, a condenser, an evaporator, an expansion valve, a one-way valve, a first valve, a second valve, a third valve, a fourth valve and a fifth valve, linkage operation among the refrigerating modules is realized by controlling opening and closing of the valves, a hot gas bypass energy adjusting function of an air suction end of the refrigerating compressor, a hot gas bypass energy adjusting function of an inlet of the evaporator, a hot gas bypass mixed energy adjusting function of the air suction end of the refrigerating compressor and the inlet of the evaporator, defrosting of the evaporator and the like are realized, and stepless adjustment of 0-100% of energy of the refrigerating compressor can be realized in each cycle. The system is flexible and convenient to apply and saves energy.

Description

Multifunctional refrigerating system

Technical Field

The invention relates to the technical field of refrigeration, in particular to a multifunctional refrigeration system with a plurality of flexibly spliced refrigeration modules.

Background

In the conventional refrigerating device, the compressor is not provided with an energy adjusting device in order to save cost. However, during operation, the ambient temperature varies greatly over the year, and the refrigeration load also varies greatly, so that when the load of the refrigeration environment is low, the suction pressure of the compressor is low, the flow rate of the circulated refrigerant is low, the lubricating oil return of the compressor is insufficient, the pressure lubrication condition is deteriorated, and the compressor cylinder body is worn. And long-term operation of the system below the designed suction pressure can cause the compressor motor to overheat, causing damage to the compressor motor coils. In order to protect the compressor, a low-pressure shutdown fault is usually added in the control system, namely, when the suction pressure is too low, the compressor is stopped immediately, and when the suction pressure is raised to a safe value, the compressor is allowed to start up and run, but in this way, the compressor is frequently started, so that the service life of the compressor is shortened, and the power grid is impacted; meanwhile, the temperature fluctuation range of the refrigeration environment is large, the water content of the food can be reduced, the dry consumption is increased, and the fresh-keeping and refrigeration effects of the food are very unfavorable for the refrigeration device applied to the food fresh-keeping field. Therefore, effective energy control of the compressor is important in order to enable a stable operation of the refrigeration system at low loads. In addition, for the traditional refrigerating device, all devices in the refrigerating system are single, damage of one device can lead to paralysis of the whole refrigerating system, and in view of saving input cost, spare devices are not designed generally. Furthermore, the traditional refrigerating device is placed in the fixed machine room, the refrigerating device is controlled in a centralized manner, and the control system is also protected in the fixed machine room, occupies a large amount of indoor space and brings noise to the indoor environment.

Disclosure of Invention

The invention aims at solving the technical defects in the prior art, and provides a multifunctional refrigeration system formed by splicing a plurality of refrigeration modules, wherein linkage operation among the refrigeration modules is realized by controlling the opening and closing of valves, the functions of regulating the hot gas bypass energy of the suction end of a refrigeration compressor, regulating the hot gas bypass energy of the inlet of an evaporator, regulating the mixed energy of the suction end of the refrigeration compressor and the hot gas bypass energy of the inlet of the evaporator, defrosting the evaporator and the like are realized, and stepless regulation of 0-100% of energy of the refrigeration compressor can be realized in each cycle.

The technical scheme adopted for realizing the purpose of the invention is as follows:

The multifunctional refrigeration system comprises a first refrigeration unit and a second refrigeration unit, wherein the first refrigeration unit and the second refrigeration unit respectively comprise a plurality of refrigeration modules with the same structure; each refrigeration module comprises a refrigeration compressor, a condenser, an evaporator, an expansion valve, a one-way valve, a first valve, a second valve, a third valve, a fourth valve and a fifth valve, wherein an exhaust port of the refrigeration compressor is connected with an inlet end of the one-way valve, an outlet end of the one-way valve is respectively connected with a first port of the third valve and a first port of the condenser, and an air suction port of the refrigeration compressor is respectively connected with a first port of the fourth valve and a first port of the evaporator; the second interface of the evaporator is respectively connected with the first interface of the first valve and the first interface of the expansion valve, and the second interface of the expansion valve is respectively connected with the first interface of the second valve and the second interface of the condenser through the fifth valve; in the first refrigeration unit: the second interface of the first valve of each refrigeration module is connected in parallel to serve as a first interface of the first refrigeration unit, and the second interface of the second valve of each refrigeration module is connected in parallel to serve as a second interface of the first refrigeration unit; the second interface of the third valve of each refrigeration module is connected in parallel to serve as a third interface of the first refrigeration unit, and the second interface of the fourth valve of each refrigeration module is connected in parallel to serve as a fourth interface of the first refrigeration unit; in the second refrigeration unit: the second interface of the first valve of each refrigeration module is connected in parallel to serve as a first interface of a second refrigeration unit, and the second interface of the second valve of each refrigeration module is connected in parallel to serve as a second interface of the second refrigeration unit; the second interface of the third valve of each refrigeration module is connected in parallel to serve as a third interface of the second refrigeration unit, and the second interface of the fourth valve of each refrigeration module is connected in parallel to serve as a fourth interface of the second refrigeration unit; the first interface of the first refrigeration unit is connected with the fourth interface of the second refrigeration unit; the first refrigerating unit second interface is connected with the second refrigerating unit third interface, the first refrigerating unit third interface is connected with the second refrigerating unit second interface, and the first refrigerating unit fourth interface is connected with the second refrigerating unit first interface.

Individual operation mode of each refrigeration module, in each of which: the first valve, the second valve, the third valve and the fourth valve are closed, and the fifth valve is opened; the refrigeration thermodynamic cycle flow is as follows: the air suction end of the refrigeration compressor sucks low-temperature low-pressure vapor working medium from the first interface of the evaporator, the low-temperature low-pressure vapor working medium is compressed and boosted by the refrigeration compressor and then is changed into high-temperature high-pressure gas working medium which is discharged into the one-way valve from the air discharge end of the refrigeration compressor, the high-temperature high-pressure gas working medium flowing out of the one-way valve enters the condenser from the first interface of the condenser to be condensed, heat is transferred to the outdoor, the high-pressure liquid working medium flowing out of the second interface of the condenser enters the expansion valve through the fifth valve to be expanded, the low-temperature low-pressure gas-liquid two-phase working medium flowing out of the expansion valve enters the evaporator to be evaporated, heat in a refrigeration house is absorbed, the low-temperature low-pressure gas working medium flowing out of the evaporator is sucked by the air suction end of the refrigeration compressor 1, and refrigeration thermodynamic cycle is completed.

When the first refrigeration unit and the second refrigeration unit are in linkage operation, all the refrigeration modules form a multifunctional refrigeration system; when the refrigerating system operates in a linkage way, the whole refrigerating system operates in a refrigerating process and a bypass adjusting process, a plurality of refrigerating modules in the first refrigerating unit and the second refrigerating unit alternately operate in a shunting way, and a refrigerating compressor in the refrigerating module serving as the refrigerating process operates and a refrigerating compressor in the refrigerating module serving as the bypass adjusting process stops; in addition, each refrigerating module in the first refrigerating unit and the second refrigerating unit can select to not participate in the linkage refrigerating operation of the whole refrigerating system by simultaneously closing the first valve, the second valve, the third valve and the fourth valve in the refrigerating module, so that independent refrigerating circulation in the linkage operation is realized.

The refrigeration compressor is any one of a scroll compressor, a rotor compressor, a screw compressor and a piston compressor.

The expansion valve is an electronic expansion valve, a thermal expansion valve, a capillary tube or an orifice plate throttling device.

The condenser and the evaporator are an air-cooled heat exchanger, a water-cooled heat exchanger or an evaporative heat exchanger.

The first valve, the second valve, the third valve and the fourth valve are electromagnetic valves, hand valves, ball valves or stop valves.

Compared with the prior art, the invention has the beneficial effects that:

1. The refrigerating system can realize the adjustment of the refrigerating capacity by controlling the opening and closing of the valve in the refrigerating module according to the refrigerating capacity required by the refrigerating environment, and the system has flexible and convenient application and saves energy. Meanwhile, the device stably operates when the load is small.

2. The refrigerating system realizes modularization and unitization of the unit, all refrigerating modules forming the refrigerating system can be placed in an outdoor environment, and the control device is arranged in the refrigerating modules, so that the indoor space is saved.

3. All the devices with the same functions of the refrigerating system are used in parallel or are used in unlimited standby, or are used in parallel in a group or are used in unlimited standby. After the devices with the same functions are damaged, the valves can be closed for replacement, and the normal operation of the whole refrigeration system can not be influenced at the same time.

4. All the same functional devices or all the same functional devices of the refrigeration system are used in parallel, equivalent in function or in-group parallel. The number of devices of the parallel system can be adjusted by opening and closing the valve, and flexible adjustment can be realized according to specific working conditions.

5. The plurality of refrigerating modules of the refrigerating system can independently perform refrigerating operation, can perform linkage operation, can realize 0-100% stepless regulation of the energy of the compressor, can effectively regulate the suction pressure, can reduce the temperature fluctuation range, can ensure that the refrigerating system stably operates, can reduce the temperature fluctuation range, can reduce the freezing and thawing cycle of stored foods, and can further reduce the loss of food dry consumption and moisture.

6. The refrigerating system disclosed by the invention realizes stepless regulation of the energy of the compressor, prevents the compressor from being frequently started and stopped by low-pressure alarm, increases the flow of the refrigerant of the compressor, has better lubricating oil return effect, prevents the overheat protection of the motor of the compressor from stopping, protects the compressor, reduces faults and prolongs the service life of the compressor.

7. The refrigerating system adopts the hot gas bypass to defrost the evaporators, the two groups of refrigerating units alternately work, the evaporators of each refrigerating unit can defrost one by one in sequence, the defrosting efficiency is higher, and the running cost is saved better; the start and stop times of the compressor are reduced, the impact hazard to the power grid is small, the electricity is used safely, and the operation is safe and reliable.

Drawings

FIG. 1 is a schematic diagram of a refrigeration module in a multi-functional refrigeration system according to the present invention;

Fig. 2 is a schematic diagram of a multi-functional refrigeration system according to the present invention.

Detailed Description

The invention will be described in detail below with reference to specific drawings and specific embodiments.

The structural schematic diagram of the multifunctional refrigeration system is shown in fig. 2, and the multifunctional refrigeration system comprises a first refrigeration unit A and a second refrigeration unit B, wherein the first refrigeration unit A and the second refrigeration unit B respectively comprise a plurality of refrigeration modules C with the same structure. Each refrigeration module is schematically shown in fig. 1, and comprises a refrigeration compressor 1, a condenser 3, an evaporator 2, an expansion valve 4, a one-way valve 5, a first valve 7, a second valve 8, a third valve 9, a fourth valve 10 and a fifth valve 6, wherein an exhaust port of the refrigeration compressor 1 is connected with an inlet end of the one-way valve 5, an outlet end of the one-way valve 5 is respectively connected with a first port of the third valve 9 and a first port of the condenser 3, an air suction port of the refrigeration compressor 1 is respectively connected with a first port of the fourth valve 10 and a first port of the evaporator 2, a second port of the evaporator 2 is respectively connected with a first port of the first valve 7 and a first port of the expansion valve 4, and a second port of the expansion valve 4 is respectively connected with a first port of the second valve 8 and a second port of the condenser 2 through the fifth valve 6. In the first refrigeration unit a: the second port of the first valve 7 of each refrigeration module C is connected in parallel as a first refrigeration unit first port 11, the second port of the second valve 8 of each refrigeration module C is connected in parallel as a first refrigeration unit second port 12, the second port of the third valve 9 of each refrigeration module C is connected in parallel as a first refrigeration unit third port 13, and the second port of the fourth valve 10 of each refrigeration module C is connected in parallel as a first refrigeration unit fourth port 14. In the second refrigeration unit B: the second port of the first valve 7 of each refrigeration module C is connected in parallel as a second refrigeration unit first port 15, the second port of the second valve 8 of each refrigeration module C is connected in parallel as a second refrigeration unit second port 16, the second port of the third valve 9 of each refrigeration module C is connected in parallel as a second refrigeration unit third port 17, and the second port of the fourth valve 10 of each refrigeration module C is connected in parallel as a second refrigeration unit fourth port 18. The first refrigerating unit first interface 11 is connected with the second refrigerating unit fourth interface 18; the first refrigeration unit second interface 12 is connected with the second refrigeration unit third interface 17, the first refrigeration unit third interface 13 is connected with the second refrigeration unit second interface 16, and the first refrigeration unit fourth interface 14 is connected with the second refrigeration unit first interface 15.

In the multifunctional refrigeration system, the refrigeration modules in all the first refrigeration units A and the second refrigeration units B can be independently operated or operated in a linkage manner, so that a multifunctional refrigeration mode is realized. When the refrigerating modules C in the first refrigerating unit A and the second refrigerating unit B independently operate, the start and stop of the refrigerating compressor in each refrigerating module C determines whether one refrigerating module C is put into operation, and the number of the refrigerating modules C put into operation realizes the polar adjustment of the refrigerating capacity. When the first refrigeration unit A and the second refrigeration unit B are in linkage operation, all the refrigeration modules C form a multifunctional refrigeration system. When the refrigerating system operates in a linkage way, the whole refrigerating system operates in a refrigerating process and a bypass adjusting process, a plurality of refrigerating modules C in the first refrigerating unit A and the second refrigerating unit B alternately work in a shunting way, and a refrigerating compressor in the refrigerating module serving as the refrigerating process operates and a refrigerating compressor in the refrigerating module serving as the bypass adjusting process stops. In addition, each refrigeration module C in the first refrigeration unit a and the second refrigeration unit B can realize independent refrigeration cycle in linkage operation by simultaneously closing the first valve 7, the second valve 8, the third valve 9 and the fourth valve 10 in the refrigeration module C to select not to participate in linkage refrigeration operation of the whole refrigeration system.

1. Individual operation mode of each refrigeration module:

In each refrigeration module C: the first valve 7, the second valve 8, the third valve 9 and the fourth valve 10 are closed, and the fifth valve 6 is opened. The refrigeration thermodynamic cycle flow is as follows: the air suction end of the refrigeration compressor 1 sucks low-temperature low-pressure vapor working medium from the first interface of the evaporator 2, the low-temperature low-pressure vapor working medium is compressed and boosted by the refrigeration compressor 1 and then is changed into high-temperature high-pressure gas working medium, the high-temperature high-pressure gas working medium is discharged into the one-way valve 5 from the air discharge end of the refrigeration compressor 1, the high-temperature high-pressure gas working medium flowing out of the one-way valve 5 enters the condenser 3 from the first interface of the condenser 3 to be condensed, heat is transferred to the outdoor, the high-pressure liquid working medium flowing out of the second interface of the condenser 3 enters the expansion valve 4 through the fifth valve 6 to be expanded, the low-temperature low-pressure gas-liquid working medium flowing out of the expansion valve 4 enters the evaporator 2 to be evaporated, heat in a refrigeration house is absorbed, the low-temperature low-pressure gas working medium flowing out of the evaporator 2 is sucked into the air suction end of the refrigeration compressor 1, and refrigeration thermodynamic cycle is completed.

2. Linkage cooling mode: when the first refrigeration unit A and the second refrigeration unit B are operated in a linkage way, all the refrigeration modules C in the two units form a multifunctional refrigeration system. When the refrigeration system operates in a linkage refrigeration way, the whole refrigeration system operates in two flows of a refrigeration flow and a bypass adjustment flow, and the refrigeration modules C in the first refrigeration unit A and the second refrigeration unit B alternately operate in a bypass flow way.

Example 1: taking the refrigerating module in the second refrigerating unit B to perform a refrigerating process, the refrigerating module in the first refrigerating unit a performs a bypass adjustment process as an example, that is, the refrigerating compressor in the refrigerating module in the second refrigerating unit B as the refrigerating process operates, and the refrigerating compressor in the refrigerating module in the first refrigerating unit a as the bypass adjustment process stops. The bypass adjustment flow includes: (1) The hot gas bypasses the air suction end of the refrigeration compressor 1 to adjust the thermodynamic cycle; (2) The hot gas bypasses the evaporator inlet to adjust the thermodynamic cycle; (3) The hot gas is bypassed to the air suction end of the refrigeration compressor 1 and the energy at the inlet of the evaporator 2 is mixed to regulate the thermodynamic cycle.

(1) The bypass of hot gas to the suction side of the refrigeration compressor 1 adjusts the thermodynamic cycle: the first valve 7, the second valve 8, the third valve 9 and the fifth valve 6 of the first refrigeration unit A refrigeration module C are opened, the fourth valve 10 in the first refrigeration unit A refrigeration module is closed, the fourth valve 10, the second valve 8, the third valve 9 and the fifth valve 6 of the second refrigeration unit B refrigeration module C are opened, the first valve 7 in the first refrigeration unit B is closed, and the suction end hot gas of the refrigeration compressor 1 bypassed to the refrigeration module in the second refrigeration unit B is adjusted by adjusting the opening of the expansion valve 4 in the first refrigeration unit A refrigeration module, so that the suction pressure of the refrigeration compressor 1 in the refrigeration module in the second refrigeration unit B is adjusted. The refrigeration thermodynamic cycle process is as follows: in each of the refrigeration modules of the second refrigeration unit B: the refrigerating compressor 1 compresses and boosts the sucked low-temperature low-pressure vapor working medium, and then discharges the low-temperature low-pressure vapor working medium into the one-way valve 5 through the exhaust end of the refrigerating compressor 1, and the high-temperature high-pressure gas working medium discharged from the outlet of the one-way valve 5 is divided into two parts: part of working medium directly enters a condenser 3 for condensation; the other part of working medium enters the second valve 8 in the first refrigeration unit A through the third valve 9, the third interface 17 of the second refrigeration unit B, the second interface 12 of the first refrigeration unit A. In the first refrigeration unit a: the high-pressure gas working medium from the second valve 8 of each refrigeration module of the first refrigeration unit A is divided into two parts, one part of working medium enters the condenser 3 to be condensed, the other part of working medium enters the fifth valve 6, and the working medium from the fifth valve 6 enters the expansion valve 4 to be expanded and depressurized. The condenser 3 in the first refrigeration unit A and the condenser 3 in the second refrigeration unit B have the same functions, and are used for condensing high-temperature high-pressure gas working media into liquid working media. The liquid working medium coming out of the first interface of the condenser 3 of the first refrigeration unit A is mixed with the liquid working medium coming out of the second interface of the condenser 3 of the second refrigeration unit B through the third valve 9 of the first refrigeration unit A, the third interface 13 of the first refrigeration unit, the second interface 16 of the second refrigeration unit and the second valve 8 of the second refrigeration unit B, and the mixed liquid working medium enters the expansion valve 4 of the second refrigeration unit B for expansion and depressurization. The low-pressure vapor from the expansion valve 4 of the first refrigeration unit a is mixed with the low-pressure vapor from the evaporator 2 of the second refrigeration unit B through the first valve 7 of the first refrigeration unit a, the first port 11 of the first refrigeration unit, the fourth port 18 of the second refrigeration unit and the fourth valve 10 of the second refrigeration unit B. The low-pressure gas-liquid two-phase working medium coming out of the expansion valve 4 of the second refrigeration unit B enters the evaporator 2 of the second refrigeration unit B to be evaporated, and the heat in the refrigeration house is absorbed to generate refrigeration. The low-pressure gas working medium from the first interface of the evaporator 2 of the second refrigeration unit B is mixed with the low-pressure gas from the fourth valve 10 of the second refrigeration unit B, and the mixed low-pressure vapor working medium is sucked by the suction end of the refrigeration compressor 1 of the second refrigeration unit B, so that the refrigeration cycle with the function of regulating the bypass energy of the hot gas at the suction end of the refrigeration compressor 1 of the second refrigeration unit B is completed.

(2) The hot gas bypass energy adjusting function at the inlet of each refrigerating module evaporator 2 of the second refrigerating unit B is realized: the fourth valve 10 of each refrigeration module in the second refrigeration unit B is closed, and the second valve 8, the third valve 9, the first valve 7 and the fifth valve 6 of each refrigeration module in the second refrigeration unit B are opened. The first valve 7 of each refrigeration module in the first refrigeration unit a is closed, and the second valve 8, the third valve 9, the fourth valve 10 and the fifth valve 6 of each refrigeration module in the first refrigeration unit a are opened. And the opening degree of the expansion valve 4 of the refrigeration module in the first refrigeration unit A is adjusted to adjust the quantity of hot gas and the pressure of the hot gas at the inlet of the evaporator 2 of the refrigeration module of the second refrigeration unit B. The refrigeration thermodynamic cycle process is as follows: in each refrigeration module of the second refrigeration unit B: the refrigerating compressor 1 compresses and boosts the sucked low-temperature low-pressure vapor working medium, and then discharges the low-temperature low-pressure vapor working medium into the one-way valve 5 through the exhaust end of the refrigerating compressor 1, and the high-temperature high-pressure gas working medium coming out from the outlet of the one-way valve 5 is divided into two parts: part of working medium directly enters a condenser 3 for condensation; the other part of working medium enters the second valve 8 of each refrigeration module of the first refrigeration unit A through the third valve 9, the third interface 17 of the second refrigeration unit and the second interface 12 of the first refrigeration unit A. In each refrigeration module of the first refrigeration unit a: the high-pressure gas working medium from the second valve 8 of each refrigeration module of the first refrigeration unit A is divided into two parts, one part of working medium enters the condenser 3 to be condensed, the other part of working medium enters the fifth valve 6, and the working medium from the fifth valve 6 enters the expansion valve 4 to be expanded and depressurized. The condenser 3 of the first refrigeration unit A and the condenser 3 of the second refrigeration unit B have the same functions, and are used for condensing high-temperature high-pressure gas working media into liquid working media. The liquid working medium coming out of the first interface of the condenser 3 of the first refrigerating unit A is mixed with the liquid working medium coming out of the second interface of the condenser 3 of the second refrigerating unit B after passing through the third valve 9 of the first refrigerating unit A, the third interface 13 of the first refrigerating unit, the second interface 16 of the second refrigerating unit and the second valve 8 of the second refrigerating unit B, and the mixed liquid working medium enters the expansion valve 4 of the second refrigerating unit B through the fifth valve 6 for expansion and depressurization. The low-pressure gas from the expansion valve 4 of the first refrigeration unit a is mixed with the low-pressure gas and the liquid two-phase gas from the expansion valve 4 of the second refrigeration unit B through the evaporator 2 of the first refrigeration unit a, the fourth valve 10 of the first refrigeration unit a, the fourth port 14 of the first refrigeration unit, the first port 15 of the second refrigeration unit and the first valve 7 of the second refrigeration unit B. The mixed low-pressure gas-liquid two-phase working medium enters the evaporator 2 of the second refrigeration unit B to be evaporated, the heat of a room refrigeration house is absorbed, refrigeration is generated, low-pressure gas coming out of the first port of the evaporator 2 of the second refrigeration unit B is sucked by the suction end of the refrigeration compressor 1 of the second refrigeration unit B, and the refrigeration cycle with the regulation of the bypass energy of hot gas at the inlet of the evaporator 2 of the second refrigeration unit B is completed.

(3) Hot gas bypass to the refrigerant compressor suction side of the second refrigeration unit B refrigeration module mixed with the evaporator inlet hot gas bypass energy conditioning thermodynamic cycle: in each of the refrigeration modules of the second refrigeration unit B: the first valve 7, the second valve 8, the third valve 9, the fourth valve 10 and the fifth valve 6 are opened, and each of the refrigeration modules of the first refrigeration unit a: the first valve 7, the second valve 8, the third valve 9, the fourth valve 10 and the fifth valve 6 are opened. And the opening degree of the expansion valve 4 of the first refrigeration unit A is adjusted to adjust the quantity of hot air which bypasses the air suction end of the refrigeration compressor 1 of the second refrigeration unit B and the quantity of hot air which bypasses the inlet of the evaporator 2 of the second refrigeration unit B. the refrigeration thermodynamic cycle process is as follows: in each refrigeration module of the second refrigeration unit B: the refrigeration compressor 1 compresses and boosts the sucked low-temperature low-pressure vapor working medium, and then discharges the low-temperature low-pressure vapor working medium into the one-way valve 5 through the exhaust end of the refrigeration compressor 1, and the high-temperature high-pressure gas from the outlet of the one-way valve 5 is divided into two parts: part of working medium directly enters a condenser 3 for condensation; and the other part of working medium enters the second valve 8 of the refrigeration module of the first refrigeration unit A through the third valve 9 of the second refrigeration unit B, the third interface 17 of the second refrigeration unit and the second interface 12 of the first refrigeration unit. In the first refrigeration unit a: the high-pressure gas working medium from the second valve 8 of the first refrigeration unit A is divided into two parts, one part of working medium enters the condenser 3 to be condensed, the other part of working medium enters the fifth valve 6, and the working medium from the fifth valve 6 enters the expansion valve 4 to be expanded and depressurized. The condenser 3 of the first refrigeration unit A and the condenser 3 of the second refrigeration unit B have the same functions, and are used for condensing high-temperature high-pressure gas working media into liquid working media. The liquid working medium coming out of the first interface of the condenser 3 of the first refrigeration unit A enters the second valve 8 of the second refrigeration unit B through the third valve 9, the third interface 13 and the second interface 16 of the first refrigeration unit A, and then is mixed with the liquid working medium coming out of the second interface of the condenser 3 of the second refrigeration unit B, and the mixed liquid working medium enters the expansion valve 4 of the second refrigeration unit B for expansion and depressurization after passing through the fifth valve 6 of the second refrigeration unit B. The low-pressure working medium from the expansion valve 4 of the first refrigeration unit A is divided into two parts, one part of working medium enters the fourth port 18 of the second refrigeration unit through the first valve 7 of the first refrigeration unit A and the first port 11 of the first refrigeration unit, enters the fourth valve 10 of the second refrigeration unit B through the fourth port 18 of the second refrigeration unit, and the other part of working medium is mixed with low-pressure gas-liquid two-phase gas from the expansion valve 4 of the second refrigeration unit B through the evaporator 2 of the first refrigeration unit A, the fourth valve 10 of the first refrigeration unit A, the first port 14 of the first refrigeration unit, the first port 15 of the second refrigeration unit and the first valve 7 of the second refrigeration unit B. The mixed low-pressure gas-liquid two-phase working medium enters the evaporator 2 of the second refrigeration unit B to be evaporated, and the heat in the refrigeration house is absorbed to generate refrigeration. The low-pressure gas working medium coming out of the first interface of the evaporator 2 of the second refrigeration unit B is mixed with the low-pressure gas coming out of the fourth valve 10 of the second refrigeration unit B, and the mixed low-pressure gas is sucked by the suction end of the refrigeration compressor 1 of the second refrigeration unit B, so that the refrigeration cycle with the mixed hot gas bypass energy adjustment between the inlet of the evaporator 2 of the second refrigeration unit B and the suction end of the refrigeration compressor 1 of the second refrigeration unit B is completed.

(4) The defrosting process of the evaporator 2 of the first refrigeration unit a is realized, the fourth valve 10 of the second refrigeration unit B is closed, and the second valve 8, the third valve 9, the first valve 7 and the fifth valve 6 of the second refrigeration unit B are opened. The first valve 7 of the first refrigeration unit a is closed, and the second valve 8, the third valve 9, the fourth valve 10 and the fifth valve 6 of the first refrigeration unit a are opened. The opening degree of the expansion valve 4 of the first refrigeration unit a is adjusted to the maximum. In the second refrigeration unit B: the refrigerating compressor 1 compresses and boosts the sucked low-temperature low-pressure vapor working medium, and then discharges the low-temperature low-pressure vapor working medium into the one-way valve 5 through the exhaust end of the refrigerating compressor 1, and the high-temperature high-pressure gas working medium discharged from the outlet of the one-way valve 5 is divided into two parts: part of working medium directly enters a condenser 3 of the second refrigeration unit B for condensation; and the other part of working medium enters the second valve 8 of the first refrigeration unit A through the third valve 9 of the second refrigeration unit B, the third interface 17 of the second refrigeration unit and the second interface 12 of the first refrigeration unit. In the first refrigeration unit a: the high-pressure gas working medium coming out of the second valve 8 of the first refrigeration unit A is divided into two parts, one part of working medium enters the condenser 3 to be condensed, the other part of working medium enters the fifth valve 6 of the first refrigeration unit A, and the working medium coming out of the fifth valve 6 enters the expansion valve 4. The condenser 3 of the first refrigeration unit A and the condenser 3 of the second refrigeration unit B have the same functions, and are used for condensing high-temperature high-pressure gas working media into liquid working media. The liquid working medium coming out of the first port of the condenser 3 of the first refrigeration unit A is mixed with the liquid working medium coming out of the second port of the condenser 3 of the second refrigeration unit B after passing through the third valve 9 of the first refrigeration unit A, the third port 13 of the first refrigeration unit, the second port 16 of the second refrigeration unit and the second valve 8 of the second refrigeration unit B, and the mixed liquid working medium enters the expansion valve 3 of the second refrigeration unit B for expansion and depressurization. The high-temperature gas coming out of the expansion valve 3 of the first refrigeration unit A enters the evaporator 2 of the first refrigeration unit A to be condensed, the evaporator 2 of the first refrigeration unit A is heated and defrosted, and the liquid coming out of the first interface of the evaporator 2 of the first refrigeration unit A is mixed with the low-pressure gas-liquid two-phase gas coming out of the expansion valve 4 of the second refrigeration unit B through the fourth valve 10 of the first refrigeration unit A, the fourth interface 14 of the first refrigeration unit, the first interface 15 of the second refrigeration unit and the first valve 7 of the second refrigeration unit B. the mixed low-pressure gas-liquid two-phase working medium enters the evaporator 2 of the second refrigeration unit B to be evaporated, heat in a refrigerator is absorbed, refrigeration is generated, low-pressure gas coming out of the first interface of the evaporator 2 of the second refrigeration unit B is sucked by the suction end of the refrigeration compressor 1 of the second refrigeration unit B, and refrigeration cycle of the defrosting process of the evaporator 2 with the first refrigeration unit A is completed. The middle evaporator 2 in the first refrigeration unit a in the bypass adjustment flow (or the evaporator defrosting flow) can realize the gear defrosting, namely, the first valve 7 of the refrigeration module needing to be defrosted in the first refrigeration unit a is closed, the second valve 8, the third valve 9 and the fourth valve 10 are opened to participate in the linkage cycle of the refrigeration system, and after the defrosting is finished, the first valve 7, the second valve 8, the third valve 9 and the fourth valve 10 in the first refrigeration unit a are closed, so that the refrigeration cycle is independently operated.

In the whole multifunctional refrigerating system formed by a plurality of refrigerating modules, the condensers 3 in all the refrigerating modules in the first refrigerating unit A and the second refrigerating unit B are connected in parallel, the effect is equivalent, the number of the condensers 3 which are put into operation can be changed by controlling the opening and closing of each valve in the refrigerating module, and the capacity adjustment of the variable condenser is realized according to the condensation working condition. Meanwhile, the condensers 3 in all the refrigerating modules in the first refrigerating unit A and the second refrigerating unit B are connected in parallel and are reserved for each other, and the condensers 3 can be replaced after being damaged by closing the valves, so that the normal operation of the whole refrigerating system is not affected. In all the refrigeration modules in the first refrigeration unit A and the second refrigeration unit B, the refrigeration compressors 1 in the same group are connected in parallel, the effect is equivalent, the number of the refrigeration compressors put into operation can be changed, and the polar energy adjustment of the refrigeration compressors 1 is realized according to the heat load of a refrigeration house. Simultaneously, the refrigeration compressors 1 in the same group are connected in parallel, the effect is equivalent, and the refrigeration compressors 1 can be replaced after being damaged by closing the valve, so that the normal operation of the whole refrigeration system is not influenced; the evaporators 2 in the same group are connected in parallel, the effect is equivalent, the number of the evaporators 2 put into operation can be changed, the capacity adjustment (or gear defrosting) of the evaporators can be realized according to the thermal load of a refrigeration house, meanwhile, the evaporators 2 in the same group are connected in parallel, the effect is equivalent, and the evaporators 2 can be replaced after being damaged by closing a valve, so that the normal operation of the whole refrigeration system is not influenced; the expansion valves 3 in the same group are connected in parallel, the effect is equivalent, the number (or opening) of the expansion valves 3 which are put into operation can be changed, variable flow adjustment (or hot gas bypass flow adjustment and defrosting amount adjustment) is realized according to the thermal load of a refrigeration house, meanwhile, the expansion valves 3 in the same group are connected in parallel, the effect is equivalent, and after the expansion valves are damaged, the expansion valves can be replaced by closing the valves, so that the normal operation of the whole refrigeration system is not influenced.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims

1. The multifunctional refrigeration system is characterized by comprising a first refrigeration unit and a second refrigeration unit, wherein the first refrigeration unit and the second refrigeration unit respectively comprise a plurality of refrigeration modules with the same structure; each refrigeration module comprises a refrigeration compressor, a condenser, an evaporator, an expansion valve, a one-way valve, a first valve, a second valve, a third valve, a fourth valve and a fifth valve, wherein an exhaust port of the refrigeration compressor is connected with an inlet end of the one-way valve, an outlet end of the one-way valve is respectively connected with a first port of the third valve and a first port of the condenser, and an air suction port of the refrigeration compressor is respectively connected with a first port of the fourth valve and a first port of the evaporator; the second interface of the evaporator is respectively connected with the first interface of the first valve and the first interface of the expansion valve, and the second interface of the expansion valve is respectively connected with the first interface of the second valve and the second interface of the condenser through the fifth valve; in the first refrigeration unit: the second interface of the first valve of each refrigeration module is connected in parallel to serve as a first interface of the first refrigeration unit, and the second interface of the second valve of each refrigeration module is connected in parallel to serve as a second interface of the first refrigeration unit; the second interface of the third valve of each refrigeration module is connected in parallel to serve as a third interface of the first refrigeration unit, and the second interface of the fourth valve of each refrigeration module is connected in parallel to serve as a fourth interface of the first refrigeration unit; in the second refrigeration unit: the second interface of the first valve of each refrigeration module is connected in parallel to serve as a first interface of a second refrigeration unit, and the second interface of the second valve of each refrigeration module is connected in parallel to serve as a second interface of the second refrigeration unit; the second interface of the third valve of each refrigeration module is connected in parallel to serve as a third interface of the second refrigeration unit, and the second interface of the fourth valve of each refrigeration module is connected in parallel to serve as a fourth interface of the second refrigeration unit; the first interface of the first refrigeration unit is connected with the fourth interface of the second refrigeration unit; the first refrigerating unit second interface is connected with the second refrigerating unit third interface, the first refrigerating unit third interface is connected with the second refrigerating unit second interface, and the first refrigerating unit fourth interface is connected with the second refrigerating unit first interface;

Individual operation mode of each refrigeration module, in each of which: the first valve, the second valve, the third valve and the fourth valve are closed, and the fifth valve is opened, and the refrigeration thermodynamic cycle flow is as follows: the air suction end of the refrigeration compressor sucks low-temperature low-pressure vapor working medium from a first interface of the evaporator, the low-temperature low-pressure vapor working medium is compressed and boosted by the refrigeration compressor and then is changed into high-temperature high-pressure gas working medium which is discharged into the one-way valve from the air discharge end of the refrigeration compressor, the high-temperature high-pressure gas working medium flowing out of the one-way valve enters the condenser from the first interface of the condenser to be condensed, heat is transferred to the outdoor, the high-pressure liquid working medium flowing out of a second interface of the condenser enters the expansion valve through the fifth valve to be expanded, the low-temperature low-pressure gas-liquid two-phase working medium flowing out of the expansion valve enters the evaporator to be evaporated, heat in a refrigeration house is absorbed, the low-temperature low-pressure gas working medium flowing out of the evaporator is sucked by the air suction end of the refrigeration compressor, and refrigeration thermodynamic cycle is completed;

2. A multi-function refrigeration system as recited in claim 1 wherein said refrigeration compressor is any one of a scroll compressor, a rotor compressor, a screw compressor and a piston compressor.

3. A multi-function refrigeration system as recited in claim 1 wherein said expansion valve is an electronic expansion valve, a thermal expansion valve, a capillary tube or an orifice plate restriction.

4. A multi-function refrigeration system as recited in claim 1 wherein the condenser and evaporator are air cooled heat exchangers, water cooled heat exchangers or evaporative heat exchangers.

5. A multi-function refrigeration system as recited in claim 1 wherein the first, second, third and fourth valves are solenoid valves, hand valves, ball valves or shut-off valves.