An assembled pressure-bearing refrigeration system

Abstract

The application discloses an assembled pressure-bearing refrigeration system, and particularly relates to the technical field of refrigeration equipment, which comprises a container and a composite refrigeration circulating unit integrated in the container, wherein the composite refrigeration circulating unit comprises a low-temperature stage refrigeration circulating assembly and a high-temperature stage refrigeration circulating assembly; the low-temperature stage refrigeration circulating assembly comprises a pressure-bearing liquid storage tank, and a refrigerant outlet is fixedly communicated with the bottom of the pressure-bearing liquid storage tank. The application breaks through the technical bottleneck of the traditional refrigeration system by means of the high-temperature stage and low-temperature stage double-circulation collaborative design and safety pressure control mechanism, solves the contradiction that the low temperature and safety of the traditional high-pressure refrigeration equipment cannot be considered at the same time, realizes stable and safe operation under the ultra-low temperature of-20 DEG C to-30 DEG C, realizes ultra-low temperature refrigeration through the pressure-bearing, high-temperature stage and low-temperature stage double-circulation cooling, thereby realizing larger-area refrigeration through lower temperature, and realizes the modular integration of the whole system by means of the container, so that the adaptability pain point of the fixed installation and the immobility of the traditional refrigeration system is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration equipment, more particularly, the present application relates to an assembled pressure-bearing refrigeration system. BACKGROUND

[0002] With the acceleration of urbanization process, the scale of construction continues to expand, from commercial complex, data center to biomedicine park, higher requirements are put forward for the coverage, operation efficiency and space adaptability of the refrigeration system.

[0003] The existing refrigeration system, normal pressure refrigeration system, because the phase change temperature of refrigerants such as R410A and R32 is high under normal pressure, the lower limit of refrigeration can only reach 5 DEG C, the upper limit of low temperature is limited, and the low temperature demand below-20 DEG C cannot be met; The occupation and assembly type are not well matched, the compressors, condensers, liquid storage tanks and other equipment are dispersedly arranged, and the machine room needs to be separately constructed, so the land occupation area is large; The pressure and safety are contradictory, part of the equipment trying high pressure refrigeration, because the pressure-bearing structure is not designed for low temperature environment, the low temperature easily leads to material brittle fracture and sealing failure, there is risk of pressure out of control and refrigerant leakage, and the refrigeration efficiency greatly decreases with pressure fluctuation, it is difficult to balance low temperature, safety and large area refrigeration and refrigeration, at the same time, the refrigeration efficiency greatly decreases with system pressure fluctuation, it is difficult to balance ultra-low temperature, safe pressure-bearing and large area refrigeration. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the present application provides an assembled pressure-bearing refrigeration system to solve the problems in the background art.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: an assembled pressure-bearing refrigeration system, comprising a container and a composite refrigeration cycle unit integrated in the container, the composite refrigeration cycle unit comprising a low-temperature level refrigeration cycle component and a high-temperature level refrigeration cycle component;

[0006] The low-temperature level refrigeration cycle component comprises a pressure-bearing liquid storage tank, the bottom of the pressure-bearing liquid storage tank is fixedly connected with a refrigerant outlet, the bottom of the refrigerant outlet is fixedly installed with a low-temperature stop valve, the bottom of the low-temperature stop valve is fixedly connected with a refrigeration output pipeline, one side of the container is fixedly connected with a refrigeration return pipeline, one end of the refrigeration return pipeline is fixedly installed with a double-pipe heat exchanger, the double-pipe heat exchanger is composed of an inner pipe and an outer pipe coaxially sleeved, the top of the outer pipe of the double-pipe heat exchanger is fixedly connected with a first return pipe, one side of the first return pipe is fixedly connected with a heat exchange box, one side of the heat exchange box is provided with a second return pipe, one side of the second return pipe is fixedly installed with a low-temperature level throttling valve, one end of the low-temperature level throttling valve is fixedly connected with a circulating pump, and the circulating pump and the pressure-bearing liquid storage tank are fixedly connected with a return pipeline;

[0007] The high-temperature stage refrigeration cycle assembly comprises a high-temperature stage refrigerant tank body arranged on one side of the pressure-bearing liquid storage tank, a baffle-type gas-liquid separation plate fixedly installed inside the high-temperature stage refrigerant tank body, a gaseous refrigerant discharge pipe fixedly and communicatively connected to one side of the high-temperature stage refrigerant tank body near the top of the baffle-type gas-liquid separation plate, a gas-liquid separator fixedly installed at one end of the gaseous refrigerant discharge pipe, a liquid backflow pipe arranged between the gas-liquid separator and the high-temperature stage refrigerant tank body, a one-way valve fixedly installed at one end of the liquid backflow pipe, a high-pressure compressor fixedly and communicatively connected to the gas outlet end of the gas-liquid separator, a double-pipe heat exchanger inner pipe in communication with one end of the high-pressure compressor, an inlet pipe fixedly and communicatively connected to the output end of the double-pipe heat exchanger inner pipe, an evaporative condenser fixedly installed at the top of the inlet pipe, a connecting pipe fixedly and communicatively connected between the evaporative condenser and a heat exchange box, a high-temperature stage throttling valve fixedly installed in the connecting pipe, and a high-temperature stage refrigerant backflow pipe fixedly and communicatively connected between the heat exchange box and the high-temperature stage refrigerant tank body.

[0008] Preferably, a serpentine coil pipe is fixedly installed inside the heat exchange box, one end of the serpentine coil pipe is sealingly and fixedly connected to the first backflow pipe, the other end of the serpentine coil pipe is sealingly and fixedly connected to the second backflow pipe, and the serpentine coil pipe is made of stainless steel.

[0009] Preferably, a plurality of baffle plates are fixedly connected to the top inner wall and the bottom inner wall of the heat exchange box, the baffle plates are arranged perpendicularly to the inner wall of the heat exchange box, and the baffle plates extend to abut against the outer wall of the serpentine coil pipe, so as to change the flow path of the high-temperature stage refrigerant flowing through the heat exchange box.

[0010] Preferably, the pressure-bearing liquid storage tank is formed by welding a low-temperature ductile steel and a titanium alloy composite plate, and the inner wall of the tank body is coated with a polytetrafluoroethylene anti-corrosion coating.

[0011] Preferably, a pressure sensor is fixedly installed on one side of the inner wall of the pressure-bearing liquid storage tank, a pressure relief pipe is fixedly and communicatively connected to one side of the pressure-bearing liquid storage tank, and a safety valve is fixedly installed at one end of the pressure relief pipe.

[0012] Preferably, the application further comprises a controller and an audible and visual alarm, the controller is electrically connected to the pressure sensor arranged on the pressure-bearing liquid storage tank, the audible and visual alarm, the low-temperature stop valve and the circulating pump.

[0013] The controller is configured to adjust the opening degree of the low-temperature stop valve and the power of the circulating pump when the pressure detected by the pressure sensor exceeds a first preset value, and trigger the audible and visual alarm to alarm when the pressure detected by the pressure sensor exceeds a second preset value higher than the first preset value.

[0014] Preferably, a plurality of support columns are fixedly connected between the container and the pressure-bearing liquid storage tank and the high-temperature stage refrigerant tank body.

[0015] Preferably, one end of the liquid return pipe away from the gas-liquid separator is communicated with the lower part of the sidewall of the high-temperature level refrigerant tank body, and the one-way valve on the liquid return pipe only allows the liquid refrigerant in the gas-liquid separator to flow to the high-temperature level refrigerant tank body in one direction.

[0016] Preferably, the inner tube of the double-pipe heat exchanger is communicated with the inlet pipe for the high-temperature high-pressure liquid refrigerant in the high-temperature level refrigeration cycle assembly to flow, and the outer tube of the double-pipe heat exchanger is communicated with the first return pipe for the low-temperature level liquid refrigerant in the low-temperature level refrigeration cycle assembly to flow, and the low-temperature level liquid refrigerant flowing through the outer tube can pre-cool the high-temperature high-pressure liquid refrigerant flowing through the inner tube.

[0017] Preferably, the container wall adopts a double-layer color steel plate structure.

[0018] Technical effects and advantages of the present application:

[0019] 1. Through the collaborative design and safety pressure control mechanism of high-temperature level and low-temperature level double cycles, the technical bottleneck of traditional refrigeration systems is completely broken through. On the one hand, the high-temperature level cycle reduces the pressure and temperature of the refrigerant to-10℃ to-15℃ cold source, providing basic cold capacity for the low-temperature level cycle, cooperating with heat exchange in the low-temperature level cycle to further reduce the temperature, and through the pressure reduction operation of the low-temperature level throttling valve using the pressure and temperature correlation characteristics, the refrigeration temperature is reduced from the lower limit of 5℃ of the normal pressure system to-20℃ to-30℃, meeting the demand of deep cooling scene, on the other hand, the pressure-bearing liquid storage tank adopts a special structure of low-temperature ductile steel and titanium alloy composite plate, and a polytetrafluoroethylene corrosion-resistant coating, solving the problems of low-temperature brittle fracture and corrosion, combined with the triple pressure control of pressure sensor, controller and safety valve, the contradiction that traditional high-pressure refrigeration equipment cannot be low-temperature and safe at the same time is solved, realizing stable and safe operation at-20℃ to-30℃ super-low temperature, realizing super-low temperature refrigeration through pressure-bearing, high-temperature level and low-temperature level double cycle cooling, so as to realize larger area refrigeration through lower temperature.

[0020] 2. Through multiple designs, high-efficiency energy saving and long-term reliable operation are realized. In terms of cold capacity gradient utilization, the double-pipe heat exchanger uses low-temperature level refrigerant cold capacity to pre-cool high-temperature level refrigerant, reduces the heat dissipation load of the evaporative condenser, and reduces the energy consumption of the high-pressure compressor. In terms of heat exchange efficiency optimization, the flow deflector in the heat exchange box forces the high-temperature level refrigerant to flow back, cooperating with the large contact area of the stainless steel serpentine coil pipe, the heat exchange temperature difference is increased from 5℃ to 10℃~15℃, accelerating the condensation of low-temperature level refrigerant, in terms of equipment protection, the double separation of the deflection type gas-liquid separation plate and the gas-liquid separator, and the one-way valve, avoid liquid refrigerant entering the compressor to cause liquid hammer damage, the double-layer color steel plate structure of the container considers heat preservation and impact resistance, which not only reduces the loss of cold capacity, but also protects the internal equipment from the outdoor environment, ensuring long-term stable operation of the system.

[0021] 3. The system is modularized and integrated by using a container, and a machine room does not need to be separately built for dispersed devices such as compressors, condensers and liquid storage tanks, so that the land occupation area of the traditional dispersed refrigeration system is greatly reduced, and the container supports overall hoisting and migration, can be flexibly adapted to outdoor scenes that need to be moved, and solves the adaptability pain point that the traditional refrigeration system is fixedly installed and cannot be moved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the application.

[0023] Figure 2 It is a schematic diagram of the side view structure of the application.

[0024] Figure 3 It is a schematic diagram of the internal structure of the container of the application.

[0025] Figure 4 It is a schematic diagram of the internal structure of the heat exchange box of the application.

[0026] Figure 5 It is a schematic diagram of the local structure of the application.

[0027] Figure 6 It is a schematic diagram of the structure of the connection between the cold supply return pipeline and the high-temperature refrigerant tank of the application.

[0028] Figure 7 It is a schematic diagram of the internal structure of the high-temperature refrigerant tank of the application.

[0029] Figure 8 It is a schematic diagram of the front view structure of the pressure-bearing liquid storage tank of the application.

[0030] The reference signs are: 1, container; 2, pressure-bearing liquid storage tank; 3, refrigerant outlet; 4, low-temperature stop valve; 5, cold supply output pipeline; 6, cold supply return pipeline; 7, jacketed heat exchanger; 8, high-pressure compressor; 9, high-temperature refrigerant tank; 10, baffled gas-liquid separation plate; 11, gaseous refrigerant discharge pipe; 12, gas-liquid separator; 13, liquid return pipe; 14, one-way valve; 15, first return pipe; 16, heat exchange box; 17, second return pipe; 18, low-temperature throttling valve; 19, circulating pump; 20, return pipeline; 21, high-temperature refrigerant return pipe; 22, high-temperature throttling valve; 23, connecting pipe; 24, evaporative condenser; 25, inlet pipe; 26, serpentine coil; 27, baffle; 28, controller; 29, anti-corrosion coating; 30, pressure sensor; 31, pressure relief pipe; 32, safety valve; 33, audible and visual alarm; 34, support column. DETAILED DESCRIPTION

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] As attached Figures 1-8 The prefabricated pressure refrigeration system shown includes a container 1 and a composite refrigeration cycle unit integrated inside the container 1. The composite refrigeration cycle unit includes a low-temperature stage refrigeration cycle component and a high-temperature stage refrigeration cycle component.

[0033] The cryogenic refrigeration cycle assembly includes a pressurized liquid storage tank 2, with a refrigerant outlet 3 fixedly connected to the bottom of the pressurized liquid storage tank 2. A cryogenic shut-off valve 4 is fixedly installed at the bottom of the refrigerant outlet 3. A cooling output pipe 5 is fixedly connected to the bottom of the cryogenic shut-off valve 4. A cooling return pipe 6 is fixedly connected to one side of the container 1. A shell-and-tube heat exchanger 7 is fixedly installed at one end of the cooling return pipe 6. The shell-and-tube heat exchanger 7 is composed of an inner tube and an outer tube coaxially fitted. A first return pipe 15 is fixedly connected to the top of the outer tube of the shell-and-tube heat exchanger 7. A heat exchange box 16 is fixedly connected to one side of the first return pipe 15. A second return pipe 17 is provided on one side of the heat exchange box 16. A cryogenic throttling valve 18 is fixedly installed on one side of the second return pipe 17. A circulation pump 19 is fixedly connected to one end of the cryogenic throttling valve 18. A return pipe 20 is fixedly connected between the circulation pump 19 and the pressurized liquid storage tank 2.

[0034] The refrigerant outlet 3 ensures directional refrigerant output, and the refrigerant output can be adjusted as needed with the low-temperature shut-off valve 4 to avoid waste of cooling capacity or overload. The cooling output pipe 5 directly delivers the -20℃ to -30℃ cooling capacity to the external load, and the cooling return pipe 6 simultaneously recovers the liquid refrigerant after heat exchange, forming a closed loop of cooling capacity delivery and refrigerant recovery. The coaxial structure of the inner and outer tubes of the shell-and-tube heat exchanger 7 creates space for heat exchange of the high and low temperature stage refrigerants. The first return pipe 15 and the second return pipe 17 respectively realize the entry and exit of the low-temperature liquid refrigerant into and out of the heat exchange box 16, ensuring the continuity of the low-temperature stage circulation. The low-temperature stage throttling valve 18 reduces the refrigerant temperature to -20℃ to -30℃ by reducing the pressure. The circulation pump 19, combined with the return pipe 20, provides power for the refrigerant to return to the pressurized liquid storage tank 2, ensuring the stable operation of the low-temperature stage circulation.

[0035] The high-temperature refrigeration cycle assembly includes a high-temperature refrigerant tank 9, which is located on one side of the pressurized liquid storage tank 2. A baffle-type gas-liquid separator 10 is fixedly installed inside the high-temperature refrigerant tank 9. A gaseous refrigerant discharge pipe 11 is fixedly connected to one side of the high-temperature refrigerant tank 9 near the top of the baffle-type gas-liquid separator 10. A gas-liquid separator 12 is fixedly installed at one end of the gaseous refrigerant discharge pipe 11. A liquid return pipe 13 is provided between the gas-liquid separator 12 and the high-temperature refrigerant tank 9. One end of the liquid return pipe 13 is fixedly installed... Equipped with a one-way valve 14, the outlet end of the gas-liquid separator 12 is fixedly connected to a high-pressure compressor 8. One end of the high-pressure compressor 8 is connected to the inner tube of the shell-and-tube heat exchanger 7. The outlet end of the inner tube of the shell-and-tube heat exchanger 7 is fixedly connected to an inlet pipe 25. An evaporative condenser 24 is fixedly installed at the top of the inlet pipe 25. A connecting pipe 23 is fixedly connected between the evaporative condenser 24 and the heat exchange box 16. A high-temperature throttling valve 22 is fixedly installed in the middle of the connecting pipe 23. A high-temperature refrigerant return pipe 21 is fixedly connected between the heat exchange box 16 and the high-temperature refrigerant tank 9.

[0036] The high-temperature refrigerant tank 9 stores high-temperature refrigerant. Its internal baffle-type gas-liquid separator 10 performs initial gas-liquid separation, ensuring that gaseous refrigerant enters the gas-liquid separator 12 through the gaseous refrigerant discharge pipe 11, preventing liquid refrigerant from directly entering the high-pressure compressor 8 and causing liquid slugging damage. The gas-liquid separator 12 performs secondary separation of the gaseous refrigerant; the separated liquid refrigerant flows back to the high-temperature refrigerant tank 9 through the liquid return pipe 13. A one-way valve 14 prevents refrigerant backflow, ensuring separation efficiency. The compressor 8 compresses the gaseous refrigerant into a high-temperature, high-pressure state, providing conditions for subsequent condensation and heat exchange; the inner tube of the shell-and-tube heat exchanger 7, in conjunction with the inlet pipe 25, transports the pre-cooled high-temperature, high-pressure refrigerant to the evaporative condenser 24 for heat dissipation and condensation; the connecting pipe 23, in conjunction with the high-temperature stage throttling valve 22, reduces the pressure and temperature of the condensed refrigerant to a cold source of -10℃ to -15℃, providing low-temperature heat exchange conditions for the heat exchange box 16; the high-temperature stage refrigerant return pipe 21 realizes the recovery of the refrigerant after heat exchange, completing the high-temperature stage closed-loop circulation.

[0037] As attached Figure 4 As shown, a serpentine coil 26 is fixedly installed inside the heat exchange box 16. One end of the serpentine coil 26 is sealed and fixedly connected to the first return pipe 15, and the other end of the serpentine coil 26 is sealed and fixedly connected to the second return pipe 17. The serpentine coil 26 is made of stainless steel.

[0038] The stainless steel serpentine coil 26 has the characteristics of resisting low temperature of-20℃ to-30℃ and resisting refrigerant corrosion, avoiding the risk of leakage caused by low temperature brittle cracking or material corrosion; the serpentine structure greatly increases the contact area with the high-temperature level cold source, improving the heat exchange efficiency; the sealed communication design of the serpentine coil 26 and the first return pipe 15 and the second return pipe 17 ensures the closed flow of low-temperature liquid refrigerant in the pipe, without cold loss and refrigerant leakage, and guarantees the low-temperature level condensing effect.

[0039] As shown in the accompanying drawings Figure 4 The heat exchange box 16 is fixedly connected with a plurality of baffles 27 arranged at intervals on the top inner wall and the bottom inner wall, the baffles 27 are perpendicular to the inner wall of the heat exchange box 16, and the baffles 27 extend to abut against the outer wall of the serpentine coil 26, for changing the flow path of the high-temperature level refrigerant flowing through the heat exchange box 16.

[0040] The baffles 27 are arranged at intervals and abut against the serpentine coil 26, forcing the high-temperature level refrigerant to form a return flow in the heat exchange box 16, prolonging the residence time of the high-temperature level refrigerant, and increasing the contact frequency and area of the high-temperature level refrigerant and the outer wall of the serpentine coil 26, thereby increasing the heat exchange temperature difference from the traditional 5℃ to 10℃-15℃, solving the problem of low condensing efficiency under low temperature difference, accelerating the condensing rate of the low-temperature liquid refrigerant in the serpentine coil 26, and guaranteeing the efficient operation of the low-temperature level cycle.

[0041] As shown in the accompanying drawings Figure 1 , 2 , 3, 5, 8, the pressure liquid storage tank 2 is formed by welding a low-temperature toughness steel and a titanium alloy composite plate, and the inner wall of the tank body is coated with a polytetrafluoroethylene corrosion-resistant coating 29. The low-temperature toughness steel refers to a low-temperature pressure vessel steel that meets national or international standards, which can be selected from but not limited to 16MnDR specified in GB 3531-2014.

[0042] The combination of the low-temperature toughness steel and the titanium alloy composite plate solves the brittle cracking problem of traditional steel at-20℃ to-30℃ low temperature environment from the material level, ensuring the structural strength and safe pressure-bearing capacity of the pressure liquid storage tank 2 under low-temperature high-pressure working conditions; the polytetrafluoroethylene corrosion-resistant coating 29 on the inner wall of the tank body can resist long-term corrosion of ultra-low temperature refrigerant, prolong the service life of the pressure liquid storage tank 2, and at the same time avoid coating falling off and polluting the refrigerant, ensuring the safety of system operation.

[0043] As shown in the accompanying drawings Figure 1 , 2 , 3, 5, 8, a pressure sensor 30 is fixedly installed on one side of the inner wall of the pressure liquid storage tank 2, a pressure relief pipe 31 is fixedly communicated on one side of the pressure liquid storage tank 2, and a safety valve 32 is fixedly installed on one end of the pressure relief pipe 31.

[0044] When the pressure inside the tank exceeds the safety threshold, the safety valve 32 automatically opens and quickly releases pressure through the pressure relief pipe 31 to prevent the pressure-bearing liquid storage tank 2 from being damaged due to overpressure or refrigerant leakage, thus building a safety barrier under low temperature and high pressure conditions from a hardware perspective.

[0045] As attached Figure 1 , 2 As shown in Figures 3, 5, and 8, it also includes a controller 28 and an audible and visual alarm 33. The controller 28 is electrically connected to the pressure sensor 30, the audible and visual alarm 33, the cryogenic shut-off valve 4, and the circulating pump 19 installed on the pressure storage tank 2.

[0046] The controller 28 is configured to: adjust the opening of the cryogenic shut-off valve 4 and the power of the circulation pump 19 when the pressure detected by the pressure sensor 30 exceeds the first preset value; and trigger the audible and visual alarm 33 when the pressure detected by the pressure sensor 30 exceeds the second preset value which is higher than the first preset value.

[0047] When the pressure exceeds the first preset value, the refrigerant output is reduced by decreasing the opening of the low-temperature shut-off valve 4, the power of the circulating pump 19 is increased, and the refrigerant return is accelerated, thus actively reducing the pressure inside the tank. When the pressure exceeds the second preset value, the audible and visual alarm 33 is triggered to promptly remind the staff to intervene. Combined with the hardware pressure relief of the safety valve 32, a multi-layered safety pressure control mechanism is formed, which greatly improves the safety of system operation.

[0048] As attached Figure 1 , 2 As shown in Figures 3, 5, 6, 7, and 8, multiple support columns 34 are fixedly connected between container 1, pressure storage tank 2, and high-temperature refrigerant tank 9.

[0049] The support column 34 securely fixes the pressure storage tank 2 and the high-temperature refrigerant tank 9 to the container 1, preventing the equipment from shifting or being damaged by collision during the hoisting and relocation of the container 1. At the same time, the support column 34 raises the bottom of the equipment, reducing direct contact between the equipment and the bottom of the container 1, facilitating air circulation and heat dissipation inside the container 1, and also reserving operating space for maintenance at the bottom of the equipment, ensuring long-term stable operation of the equipment.

[0050] As attached Figure 1 , 2 As shown in Figures 3, 6, and 7, the end of the liquid return pipe 13 away from the gas-liquid separator 12 is connected to the lower part of the side wall of the high-temperature refrigerant tank 9, and the one-way valve 14 on the liquid return pipe 13 only allows the liquid refrigerant in the gas-liquid separator 12 to flow unidirectionally to the high-temperature refrigerant tank 9.

[0051] The liquid return pipe 13 is connected to the lower side wall of the high-temperature refrigerant tank 9, so that the separated liquid refrigerant can flow back smoothly to the bottom of the tank for storage, avoiding the accumulation of liquid refrigerant in the gas-liquid separator 12 and affecting the separation effect; the one-way valve 14 strictly restricts the one-way flow of refrigerant, preventing the gaseous or liquid refrigerant in the high-temperature refrigerant tank 9 from flowing back into the gas-liquid separator 12, avoiding disruption of the secondary separation operation of the gas-liquid separator 12, ensuring that only gaseous refrigerant enters the high-pressure compressor 8, and protecting the high-pressure compressor 8 from liquid slugging damage.

[0052] As attached Figure 1 , 2 As shown in Figures 3, 4, and 6, the inner tube of the shell-and-tube heat exchanger 7 is connected to the inlet pipe 25, allowing the high-temperature, high-pressure liquid refrigerant in the high-temperature stage refrigeration cycle assembly to flow through. The outer tube of the shell-and-tube heat exchanger 7 is connected to the first return pipe 15, allowing the low-temperature stage liquid refrigerant in the low-temperature stage refrigeration cycle assembly to flow through. The low-temperature stage liquid refrigerant flowing through the outer tube can pre-cool the high-temperature, high-pressure liquid refrigerant flowing through the inner tube.

[0053] By utilizing the cooling capacity of the low-temperature liquid refrigerant to pre-cool the high-temperature refrigerant, the heat dissipation load of the subsequent evaporative condenser 24 is reduced, the energy consumption of the high-pressure compressor 8 is lowered, and the cooling capacity is utilized in stages, avoiding the waste of the low-temperature refrigerant and achieving energy-saving effects.

[0054] As attached Figure 1 , 2 As shown, the container wall of container 1 adopts a double-layer color steel plate structure. The double-layer color steel plate structure of container 1 has excellent thermal insulation performance, which can effectively block the heat exchange between the inside of container 1 and the external environment, prevent the external environment heat from entering the interior and causing cold loss, ensure that the low temperature stage and high temperature stage refrigeration cycle components operate in a stable low temperature environment, and reduce the energy consumption required for the system to maintain the low temperature; at the same time, the double-layer color steel plate structure of container 1 has high strength and strong impact resistance, which can protect the internal precision equipment from the impact of external factors such as outdoor wind, rain, and collisions, and is suitable for various usage scenarios such as outdoor and temporary sites.

[0055] The working principle of the application is as follows: the assembled pressure-bearing refrigeration system realizes modular integration by relying on the container 1, realizes-20 DEG C to-30 DEG C ultra-low temperature cooling through the collaborative work of the low-temperature level refrigeration cycle assembly and the high-temperature level refrigeration cycle assembly, and realizes the safety pressure control mechanism, the high-temperature level refrigerant in the high-temperature level refrigerant tank 9 is preliminarily separated into gas and liquid through the internal baffling type gas-liquid separation plate 10, the gaseous high-temperature level refrigerant after separation is introduced into the gas-liquid separator 12 through the gaseous refrigerant discharge pipe 11 to be secondarily separated into gas and liquid, the liquid high-temperature level refrigerant after separation is returned to the lower part of the side wall of the high-temperature level refrigerant tank 9 through the liquid return pipe 13 and the one-way valve 14, the one-way valve 14 prevents reverse flow, the gaseous high-temperature level refrigerant after secondary separation is compressed into high-temperature high-pressure gaseous refrigerant by the high-pressure compressor 8, the high-temperature high-pressure gaseous refrigerant then enters the inner pipe of the double-pipe heat exchanger 7, at the same time, the ultra-low temperature liquid refrigerant in the pressure-bearing liquid storage tank 2 in the low-temperature level refrigeration cycle assembly flows out through the bottom refrigerant outlet 3, enters the cooling output pipe 5 to provide low-temperature cooling capacity for the external load after the flow is controlled by the low-temperature stop valve 4, the refrigerant after cooling becomes low-temperature refrigerant, enters the outer pipe of the double-pipe heat exchanger 7 through the cooling return pipe 6 on one side of the container 1, at this time, the low-temperature liquid refrigerant in the outer pipe of the double-pipe heat exchanger 7 is indirectly heat-exchanged with the high-temperature high-pressure gaseous refrigerant in the inner pipe to precool the high-temperature high-pressure gaseous refrigerant, reduce the energy consumption of the compressor, and the overall refrigeration efficiency is higher and more energy-saving, the pre-cooled high-temperature high-pressure gaseous refrigerant enters the evaporative condenser 24 through the inlet pipe 25 to be condensed into high-temperature high-pressure liquid refrigerant after heat dissipation, the high-temperature high-pressure liquid refrigerant is depressurized and cooled by the connecting pipe 23 and the high-temperature level throttling valve 22 in the middle part to form a low-temperature liquid cold source and enter the heat exchange box 16;

[0056] At the same time, the low-temperature refrigerant after pre-cooling of the high-temperature level refrigerant in the outer pipe of the double-pipe heat exchanger 7 enters the serpentine coil 26 in the heat exchange box 16 through the first return pipe 15, the flow baffles 27 arranged at intervals on the inner wall of the top and the inner wall of the bottom of the heat exchange box 16 change the flow path of the high-temperature level low-temperature liquid cold source, prolong the residence time of the high-temperature level low-temperature liquid cold source in the heat exchange box 16, and make the high-temperature level low-temperature liquid cold source and the low-temperature liquid refrigerant in the serpentine coil 26 be indirectly heat-exchanged sufficiently, the low-temperature liquid refrigerant in the serpentine coil 26 is further cooled by the high-temperature level refrigeration cycle assembly, then enters the low-temperature level throttling valve 18 through the second return pipe 17 to be depressurized and cooled into ultra-low temperature liquid refrigerant, the ultra-low temperature liquid refrigerant is driven by the circulating pump 19 to return to the pressure-bearing liquid storage tank 2 through the return pipe 20, the low-temperature level cycle is completed, the ultra-low temperature refrigerant is heat-exchanged with the evaporator outside through the cooling output pipe 5 and the cooling return pipe 6 to reduce the refrigeration temperature from normal pressure 5 DEG C to-20 DEG C to-30 DEG C, realize ultra-low temperature refrigeration, and the high-temperature level refrigerant after heat exchange with the serpentine coil 26 in the heat exchange box 16 returns to the high-temperature level refrigerant tank 9 through the high-temperature level refrigerant return pipe 21 to complete the high-temperature level cycle;

[0057] Throughout the operation, the pressure sensor 30 on one side of the inner wall of the pressure storage tank 2 detects the pressure in the tank in real time and transmits the data to the controller 28, when the pressure exceeds the first preset value, the controller 28 adjusts the opening of the low temperature stop valve 4 and the power of the circulating pump 19 to control the pressure, when the pressure exceeds the second preset value higher than the first preset value, the controller 28 triggers the sound and light alarm 33 to alarm, if the pressure continues to rise, the safety valve 32 on one side of the pressure relief pipe 31 of the pressure storage tank 2 is automatically opened to release pressure, to ensure the stable and efficient operation of the whole refrigeration process.

[0058] Finally, a few points should be noted: first, in the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "installation", "connection", "connection" should be understood broadly, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to represent the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change;

[0059] Secondly: the drawings of the disclosed embodiments of the present application only involve the structures involved in the disclosed embodiments, other structures can refer to the usual design, under the condition of no conflict, the same embodiment and different embodiments of the present application can be combined with each other;

[0060] Finally: the above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A packaged pressure-bearing refrigeration system comprising a container (1) and a combined refrigeration cycle unit integrated inside the container (1), characterized in that: The composite refrigeration cycle unit comprises a low-temperature stage refrigeration cycle assembly and a high-temperature stage refrigeration cycle assembly; The low-temperature stage refrigeration cycle assembly comprises a pressure-bearing liquid storage tank (2), a refrigerant outlet (3) is fixedly communicated at the bottom of the pressure-bearing liquid storage tank (2), a low-temperature stop valve (4) is fixedly installed at the bottom of the refrigerant outlet (3), a cold supply output pipeline (5) is fixedly communicated at the bottom of the low-temperature stop valve (4), a cold supply return pipeline (6) is fixedly connected to one side of the container (1), a double-pipe heat exchanger (7) is fixedly installed at one end of the cold supply return pipeline (6), the double-pipe heat exchanger (7) is composed of an inner pipe and an outer pipe coaxially sleeved, a first return pipe (15) is fixedly communicated at the top of the outer pipe of the double-pipe heat exchanger (7), a heat exchange box (16) is fixedly connected to one side of the first return pipe (15), a second return pipe (17) is arranged at one side of the heat exchange box (16), a low-temperature stage throttling valve (18) is fixedly installed at one side of the second return pipe (17), a circulating pump (19) is fixedly connected to one end of the low-temperature stage throttling valve (18), and a return pipeline (20) is fixedly communicated between the circulating pump (19) and the pressure-bearing liquid storage tank (2). The high-temperature stage refrigeration cycle assembly comprises a high-temperature stage refrigerant tank body (9), the high-temperature stage refrigerant tank body (9) is arranged at one side of the pressure-bearing liquid storage tank (2), a baffle-type gas-liquid separation plate (10) is fixedly installed in the high-temperature stage refrigerant tank body (9), a gaseous refrigerant discharge pipe (11) is fixedly communicated at one side of the high-temperature stage refrigerant tank body (9) and close to the top of the baffle-type gas-liquid separation plate (10), a gas-liquid separator (12) is fixedly installed at one end of the gaseous refrigerant discharge pipe (11), a liquid return pipe (13) is arranged between the gas-liquid separator (12) and the high-temperature stage refrigerant tank body (9), a one-way valve (14) is fixedly installed at one end of the liquid return pipe (13), a high-pressure compressor (8) is fixedly communicated at the gas outlet end of the gas-liquid separator (12), one end of the high-pressure compressor (8) is communicated with the inner pipe of the double-pipe heat exchanger (7), an inlet pipe (25) is fixedly communicated at the output end of the inner pipe of the double-pipe heat exchanger (7), an evaporative condenser (24) is fixedly installed at the top of the inlet pipe (25), a connecting pipe (23) is fixedly communicated between the evaporative condenser (24) and the heat exchange box (16), a high-temperature stage throttling valve (22) is fixedly installed in the connecting pipe (23), and a high-temperature stage refrigerant return pipe (21) is fixedly communicated between the heat exchange box (16) and the high-temperature stage refrigerant tank body (9).

2. An assembled pressure-bearing refrigeration system according to claim 1, characterized in that: A coiled pipe (26) is fixedly installed in the heat exchange box (16), one end of the coiled pipe (26) is sealingly and fixedly communicated with the first return pipe (15), the other end of the coiled pipe (26) is sealingly and fixedly communicated with the second return pipe (17), and the coiled pipe (26) is made of stainless steel.

3. An assembled pressure-bearing refrigeration system as claimed in claim 2, characterized in that: The top inner wall and the bottom inner wall of the heat exchange box (16) are fixedly connected with a plurality of baffle plates (27) arranged at intervals, the baffle plates (27) are arranged perpendicularly to the inner wall of the heat exchange box (16), and the baffle plates (27) extend to abut against the outer wall of the serpentine coil (26), so as to change the flow path of the high-temperature refrigerant flowing through the heat exchange box (16).

4. The packaged refrigeration system of claim 1, wherein: The pressure-bearing liquid storage tank (2) is formed by welding a low-temperature toughness steel and a titanium alloy composite plate, and the inner wall of the tank body is coated with a polytetrafluoroethylene anti-corrosion coating (29).

5. The packaged refrigeration system of claim 1, wherein: A pressure sensor (30) is fixedly installed on one side of the inner wall of the pressure-bearing liquid storage tank (2), a pressure relief pipe (31) is fixedly and communicatively connected to one side of the pressure-bearing liquid storage tank (2), and a safety valve (32) is fixedly installed at one end of the pressure relief pipe (31).

6. The packaged refrigeration system of claim 1, wherein: A controller (28) and an audible and visual alarm (33) are further included, and the controller (28) is electrically connected with the pressure sensor (30), the audible and visual alarm (33), the low-temperature stop valve (4) and the circulating pump (19) arranged on the pressure-bearing liquid storage tank (2); The controller (28) is configured to adjust the opening degree of the low-temperature stop valve (4) and the power of the circulating pump (19) when the pressure detected by the pressure sensor (30) exceeds a first preset value, and trigger the audible and visual alarm (33) to alarm when the pressure detected by the pressure sensor (30) exceeds a second preset value higher than the first preset value.

7. The packaged refrigeration system of claim 1, wherein: A plurality of support columns (34) are fixedly connected between the container (1) and the pressure-bearing liquid storage tank (2) and the high-temperature refrigerant tank body (9).

8. The packaged refrigeration system of claim 1, wherein: One end of the liquid return pipe (13) away from the gas-liquid separator (12) is in communication with the lower part of the side wall of the high-temperature refrigerant tank body (9), and the one-way valve (14) on the liquid return pipe (13) only allows the liquid refrigerant in the gas-liquid separator (12) to flow to the high-temperature refrigerant tank body (9) in one direction.

9. The packaged refrigeration system of claim 1, wherein: The inner tube of the double-pipe heat exchanger (7) is in communication with the inlet pipe (25) for the high-temperature and high-pressure liquid refrigerant in the high-temperature refrigeration cycle assembly to flow therethrough, and the outer tube of the double-pipe heat exchanger (7) is in communication with the first return pipe (15) for the low-temperature liquid refrigerant in the low-temperature refrigeration cycle assembly to flow therethrough, and the low-temperature liquid refrigerant flowing through the outer tube can pre-cool the high-temperature and high-pressure liquid refrigerant flowing through the inner tube.

10. The packaged refrigeration system of claim 1, wherein: The container wall of the container (1) adopts a double-layer color steel plate structure.

Images