High-low temperature cascade refrigerating unit

Abstract

The invention discloses a high-low temperature cascade refrigerating unit which comprises a shell, circulating pipes are arranged at the bottom of one side of the shell at equal intervals, and the high-low temperature cascade refrigerating unit further comprises an outer circulating assembly. The invention relates to the technical field of refrigeration equipment, in particular to a high and low temperature cascade refrigeration unit, through cooperation of a shell, a circulation pipe, an outer circulation assembly, an inner circulation assembly and a power distribution control assembly, multiple independent refrigeration circulation systems are formed in the refrigeration unit, and when ultralow temperature refrigeration operation or temperature fluctuation of a circulation medium occurs, the refrigeration cycle system is started; by accurately regulating and controlling each refrigerating cycle system, thermal stress impact caused by ultralow-temperature operation or temperature fluctuation can be dispersed and relieved, the stability of the refrigerating unit is remarkably improved, the thermal stress load in the refrigerating unit is reduced, equipment faults can be effectively avoided, and the service life of the refrigerating unit is prolonged. In this way, the service life of the refrigeration equipment can be prolonged, and the overall refrigeration effect and refrigeration efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, in particular to a high-low temperature cascade refrigeration unit. Background Art

[0002] A refrigeration unit is an integrated refrigeration system with a refrigeration compressor as its core, integrating key components such as a condenser, evaporator, and expansion valve. It is used to actively remove heat to maintain a low-temperature environment. Its core working principle is to achieve directional heat transfer through the cyclic phase change of the refrigerant in four stages of compression, condensation, throttling, and evaporation in a closed system. It is widely used in the pharmaceutical, chemical, and food processing fields, and can meet the process requirements of gas liquefaction, low-temperature quenching of metals, etc. In some special applications, a cascade refrigeration unit is required to provide an ultra-low temperature environment.

[0003] Although cascade refrigeration units can meet the needs of ultra-low temperature refrigeration to a certain extent, when ultra-low temperature refrigeration is in operation or the temperature of the circulating medium fluctuates, key components such as the compressor, condenser, and evaporator in the unit often face large thermal stress shocks, resulting in poor stability of the refrigeration unit, affecting the overall refrigeration effect and efficiency, and making it difficult to respond to changes in ambient temperature in a timely manner, and to quickly adjust and accurately control temperature fluctuations. In severe cases, it may even cause equipment failure, affecting the normal operation and service life of the refrigeration equipment.

[0004] How to design a high and low temperature cascade refrigeration unit that can quickly respond to changes in ambient temperature and improve the stability and refrigeration efficiency of the refrigeration unit is the technical problem to be solved by this invention Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a high-low temperature cascade refrigeration unit, which solves the problem that when ultra-low temperature refrigeration is in operation or the temperature of the circulating medium fluctuates, the compressor, condenser, evaporator and other key components in the unit often face large thermal stress shocks, resulting in poor stability of the refrigeration unit, affecting the overall refrigeration effect and efficiency, and making it difficult to respond to changes in ambient temperature in a timely manner, quickly adjust and accurately control temperature fluctuations, and in severe cases may even cause equipment failure, affecting the normal operation and service life of the refrigeration equipment.

[0006] To achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: a high-low temperature cascade refrigeration unit, including a shell, and circulation pipes are equidistantly arranged on the bottom of one side of the shell. The high-low temperature cascade refrigeration unit also includes an external circulation component, which is arranged on the side of the shell inside close to the circulation pipe; the internal circulation component is arranged on the side of the shell inside away from the circulation pipe; the power distribution control component is arranged on the side of the shell away from the circulation pipe; wherein, the circulation medium of the external circulation component exchanges heat with the circulation medium transported by the circulation pipe, the internal circulation component exchanges heat with the circulation medium of the external circulation component, and the power distribution control component controls the operation of the entire unit.

[0007] Preferably, the external circulation component includes an external circulation pump, which is installed at the inner bottom of the shell; the first plate heat exchanger is installed at the bottom of the shell and is located on one side of the external circulation pump, and the input end on one side is connected to the output end of the external circulation pump, and the input end and the output end on the other side are respectively connected to the two circulation pipes; the water tank is installed inside the shell and is located above the external circulation pump, and the bottom is connected to the input end of the external circulation pump, and the top is connected to the output end of the first plate heat exchanger away from the circulation pipe; the water level monitoring component is arranged on one side of the water tank; the water supply and drainage component is arranged on the outside of the water tank; wherein, through the cooperation of the external circulation pump, the first plate heat exchanger and the water tank, the circulating medium is circulated and transported between the water tank and the first plate heat exchanger, and the first plate heat exchanger enables the circulating medium in the water tank to exchange heat with the circulating medium input from the outside.

[0008] Preferably, the water level monitoring component includes a water level display, which is arranged on one side of the shell and is connected to the water tank; the liquid level switch is installed on one side of the outer wall of the water tank; wherein, the water level display can display the liquid level height in the water tank in real time, and the liquid level switch can send an alarm signal to the control system when the liquid level in the water tank is too low.

[0009] Preferably, the water supply and drainage assembly includes a water supply port, which is connected to the top of one side of the water tank; a drain pipe is connected to the bottom of one side of the water tank; and a drain valve is installed at the end of the drain pipe away from the water tank; wherein, through the cooperation of the water supply port, the drain pipe and the drain valve, the circulating medium in the water tank can be replenished or discharged.

[0010] Preferably, the internal circulation component includes a second plate heat exchanger, which is arranged on a side of the shell body close to the water tank, and the output end on one side is connected to the top of the water tank; the internal circulation pump is arranged on one side of the external circulation pump, and the input end is connected to the bottom of the water tank, and the output end is connected to the input end of the second plate heat exchanger close to the water tank; the first compressor is arranged on a side of the shell body away from the external circulation pump, and the output end is connected to the input end of the second plate heat exchanger away from the water tank; the fin radiator is arranged on the upper inner side of the shell body, and the output end on one side is connected to the input end of the first compressor; the output end of the first oil separator is connected to the input end of the fin radiator on one side; the input end of the liquid reservoir is connected to the input end of the first oil separator, and the output end is connected to the input end of the second plate heat exchanger; the third plate heat exchanger is arranged on one side of the second plate heat exchanger, and the input end on one side is connected to the output end of the second plate heat exchanger, and the output end near the second plate heat exchanger is connected to the first oil separator. The input ends are connected; the filter input end is connected to the output end of the fin radiator away from the first compressor, and the output end is connected to the input end of the third plate heat exchanger away from the second plate heat exchanger; the second compressor is arranged on one side of the first compressor, and the input end and the output end of the third plate heat exchanger away from the second plate heat exchanger; the second oil separator is arranged on one side of the second compressor, and the input end is connected to the output end of the second compressor, and the output end is connected to the input end of the fin radiator away from the first compressor; the expansion valve is installed on the input end of the third plate heat exchanger away from the second plate heat exchanger; wherein, the high-temperature circulating medium in the liquid storage tank is circulated between the fin radiator and the second plate heat exchanger through the first compressor, and the liquid circulating medium in the water tank is heat exchanged with the high-temperature circulating refrigerant in the second plate heat exchanger, and the low-temperature circulating medium is circulated between the fin radiator and the third plate heat exchanger through the second compressor, and the high and low-temperature circulating refrigerants are heat exchanged in the third plate heat exchanger.

[0011] Preferably, the power distribution control component includes a distribution box, which is fixedly connected to the side of the shell away from the water tank; the box door is rotatably connected to the side of the distribution box; the controller is installed inside the distribution box; the control panel is installed on the outer wall of the box door; multiple pressure gauges are provided, which are evenly distributed above the distribution box; the temperature measuring component is provided on the side away from the distribution box; and the fault alarm component is provided on the top of the shell; wherein, the operation of the refrigeration equipment is controlled by the controller and the control panel, the pressure gauge displays the pressure of each pipeline of the refrigeration equipment, the temperature measuring component senses the output temperature of the refrigeration equipment, and the fault alarm component alarms when an operational failure occurs in the refrigeration equipment.

[0012] Preferably, the temperature measuring component includes a first temperature sensor, which is installed on one side of the outer wall of the water tank and electrically connected to the controller; two second temperature sensors are provided, which are respectively installed on the top of the circulation pipe and electrically connected to the controller; wherein the first temperature sensor measures the temperature of the liquid circulating medium in the water tank, and the second temperature sensor measures the temperature of the liquid circulating medium in the circulation pipe.

[0013] Preferably, the fault alarm component includes an audible and visual alarm, which is installed on one side of the top of the shell and is electrically connected to the controller; the signal transmitter is installed on the side of the top of the shell away from the audible and visual alarm, and is electrically connected to the controller; wherein, when an operational failure occurs in the refrigeration equipment, the audible and visual alarm receives the fault signal from the controller and emits an audible and visual alarm, and the signal transmitter transmits the operating status of the refrigeration equipment to the workshop control center in real time.

[0014] Preferably, a heat dissipation component is provided on the top of the shell, and the heat dissipation component includes a first heat dissipation hole, which is equidistantly opened on both sides of the outer wall of the shell; two fans are provided, which are distributed on the top of the fin heat sink; two heat dissipation fans are provided, which are installed on one side of the inner wall of the distribution box; multiple second heat dissipation holes are provided, which are equidistantly opened on both sides of the outer wall of the distribution box; wherein, the air inside the shell is circulated through the cooperation of the first heat dissipation hole and the fan, and the air inside the distribution box is circulated through the cooperation of the heat dissipation fan and the second heat dissipation hole.

[0015] Preferably, moving wheels are installed on both sides of the bottom of the shell. Beneficial effects

[0016] The present invention provides a high-low temperature cascade refrigeration unit. This unit has the following beneficial effects: The high-low temperature cascade refrigeration unit forms multiple independent refrigeration circulation systems within the refrigeration unit through the coordination of the housing, circulation pipes, external circulation components, internal circulation components, and power distribution control components. During ultra-low temperature refrigeration operation or when the temperature of the circulating medium fluctuates, precise regulation of each refrigeration circulation system can disperse and alleviate the thermal stress impact caused by ultra-low temperature operation or temperature fluctuations, significantly improving the stability of the refrigeration unit and reducing the thermal stress load within the refrigeration unit. This can effectively prevent equipment failures, thereby extending the service life of the refrigeration equipment and improving the overall refrigeration effect and efficiency.

[0017] Through the cooperation between the second plate heat exchanger, the internal circulation pump, the first compressor, the fin radiator, the first oil separator, the liquid reservoir, the third plate heat exchanger, the filter, the second compressor, the second oil separator and the expansion valve, two independent refrigeration circulation systems are formed inside the refrigeration unit. Through the heat transfer and release between the liquid circulating medium, the high-temperature circulating refrigerant and the low-temperature circulating refrigerant, it is ensured that the heat of the liquid circulating medium can be quickly transferred and released, thereby forming high and low temperature cascade refrigeration, forming efficient refrigeration for the liquid circulating medium in the water tank, and achieving the effect of ultra-low temperature refrigeration, which helps to improve the refrigeration efficiency of the refrigeration unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a side view of the structure of the present invention; Figure 3 It is a schematic diagram of the appearance of the present invention; Figure 4 This is a cross-sectional view of the appearance of the present invention; Figure 5 This is a cross-sectional view of the appearance of the present invention from another angle; Figure 6 Schematic diagram of the appearance of the water tank, the first plate heat exchanger and the fin radiator in the present invention; Figure 7 for Figure 6 A partial enlarged view of area A in the middle.

[0019] In the figure: 1. Shell; 2. Circulation pipe; 3. External circulation assembly; 4. Internal circulation assembly; 5. Power distribution control assembly; 6. Heat dissipation assembly; 7. Moving wheel; 31. External circulation pump; 32. First plate heat exchanger; 33. Water tank; 34. Water level monitoring assembly; 35. Water supply and drainage assembly; 341. Water level display; 342. Liquid level switch; 351. Water supply port; 352. Drain pipe; 353. Drain valve; 401. Second plate heat exchanger; 402. Internal circulation pump; 403. First compressor; 404. Finned radiator; 405. First oil separator Separator; 406, liquid storage device; 407, third plate heat exchanger; 408, filter; 409, second compressor; 410, second oil separator; 411, expansion valve; 51, distribution box; 52, box door; 53, controller; 54, control panel; 55, pressure gauge; 56, temperature measuring component; 57, fault alarm component; 561, first temperature sensor; 562, second temperature sensor; 571, sound and light alarm; 572, signal transmitter; 61, first heat dissipation hole; 62, fan; 63, cooling fan; 64, second heat dissipation hole. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] During ultra-low temperature refrigeration operation or when the temperature of the circulating medium fluctuates, key components in the unit, such as the compressor, condenser, and evaporator, often face large thermal stress shocks, resulting in poor stability of the refrigeration unit, affecting the overall refrigeration effect and efficiency, and making it difficult to respond to changes in ambient temperature in a timely manner, quickly adjust to and accurately control temperature fluctuations. In severe cases, it may even cause equipment failure, affecting the normal operation and service life of the refrigeration equipment.

[0022] In view of this, the present invention provides a high-low temperature cascade refrigeration unit, which forms multiple independent refrigeration circulation systems inside the refrigeration unit through the cooperation between the shell, circulation pipes, external circulation components, internal circulation components and distribution control components. When ultra-low temperature refrigeration is operated or the temperature of the circulating medium fluctuates, the thermal stress impact caused by ultra-low temperature operation or temperature fluctuations can be dispersed and alleviated by precisely regulating each refrigeration circulation system, thereby significantly improving the stability of the refrigeration unit, and reducing the thermal stress load inside the refrigeration unit, effectively avoiding the occurrence of equipment failure, thereby extending the service life of the refrigeration equipment and improving the overall refrigeration effect and efficiency.

[0023] By those skilled in the art, the components in this case are connected in sequence. The specific connection and operation sequence should refer to the following working principle. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process.

[0024] Depend on Figure 1-5 It can be seen that a high-low temperature cascade refrigeration unit includes a shell 1, and a circulation pipe 2 is equidistantly arranged on the bottom of one side of the shell 1. The high-low temperature cascade refrigeration unit also includes an external circulation component 3, an internal circulation component 4 and a power distribution control component 5. The external circulation component 3 is arranged on the side of the shell 1 close to the circulation pipe 2; the internal circulation component 4 is arranged on the side of the shell 1 away from the circulation pipe 2; the power distribution control component 5 is arranged on the side of the shell 1 away from the circulation pipe 2; wherein the circulating medium of the external circulation component 3 exchanges heat with the circulating medium transported by the circulation pipe 2, the internal circulation component 4 exchanges heat with the circulating medium of the external circulation component 3, and the power distribution control component 5 controls the operation of the entire unit; During the specific implementation process, it is worth noting that the shell 1 is the outer shell and frame structure of the refrigeration unit, which is used to install and fix the various components of the cascade refrigeration system. The circulation pipe 2 is used to transport the external circulation medium to the interior of the cascade refrigeration unit. Through the cooperation between the shell 1, the circulation pipe 2 and the external circulation component 3, an external circulation refrigeration system is formed. The external circulation medium is transported to the interior of the refrigeration unit through the circulation pipe 2, and the heat of the external circulation medium is transferred to the low-temperature liquid circulation medium in the water tank 33 through the first plate heat exchanger 32, thereby reducing the temperature of the external circulation medium. Through the cooperation between the shell 1, the external circulation component 3 and the internal circulation component 4, there are two independent refrigeration cycle systems in the internal circulation component 4, realizing the function of high and low temperature cascade refrigeration, wherein the heat of the liquid circulation medium in the water tank 33 is absorbed by the liquid-gas conversion process of the high-temperature circulation medium, and the heat of the high-temperature circulation medium is absorbed by the liquid-gas conversion process of the low-temperature circulation medium, and finally the liquid circulation medium reaches the set temperature, so that the temperature of the external circulation medium achieves the effect of ultra-low temperature refrigeration. The power distribution control component 5 controls the operation of the refrigeration unit according to the values fed back by each sensor; Furthermore, the external circulation component 3 includes an external circulation pump 31, a first plate heat exchanger 32, a water tank 33, a water level monitoring component 34 and a water supply and drainage component 35. The external circulation pump 31 is installed at the inner bottom of the shell 1; the first plate heat exchanger 32 is installed at the bottom of the shell 1 on one side of the external circulation pump 31, and the input end on one side is connected to the output end of the external circulation pump 31, and the input end and output end on the other side are respectively connected to the two circulation pipes 2; the water tank 33 is installed inside the shell 1 above the external circulation pump 31. The bottom is connected to the input end of the external circulation pump 31, and the top is connected to the output end of the first plate heat exchanger 32 away from the circulation pipe 2; the water level monitoring component 34 is arranged on one side of the water tank 33; the water supply and drainage component 35 is arranged on the outside of the water tank 33; wherein, through the cooperation of the external circulation pump 31, the first plate heat exchanger 32 and the water tank 33, the circulating medium is circulated and transported between the water tank 33 and the first plate heat exchanger 32, and the first plate heat exchanger 32 enables the circulating medium in the water tank 33 to exchange heat with the circulating medium input from the outside; During the specific implementation process, it is worth noting that, through the cooperation between the circulation pipe 2, the external circulation pump 31, the first plate heat exchanger 32 and the water tank 33, by controlling the external circulation pump 31, the low-temperature liquid circulation medium in the water tank 33 is circulated between the water tank 33 and the first plate heat exchanger 32, thereby transferring the heat of the external circulation medium transported by the circulation pipe 2 to the low-temperature liquid circulation medium in the water tank 33, thereby cooling the external circulation medium. The water level monitoring component 34 facilitates the staff to monitor the liquid level in the water tank 33, and the replenishment and drainage component 35 is used to replenish the liquid circulation medium in the water tank 33 or discharge the liquid circulation medium from the water tank 33. The specific model of the external circulation pump 31 is not limited, and it can meet the use requirements. Furthermore, the water level monitoring assembly 34 includes a water level display 341 and a liquid level switch 342. The water level display 341 is provided on one side of the housing 1 and is in communication with the water tank 33. The liquid level switch 342 is installed on one side of the outer wall of the water tank 33. The water level display 341 can display the liquid level in the water tank 33 in real time, and the liquid level switch 342 can send an alarm signal to the control system when the liquid level in the water tank 33 is too low. In the specific implementation process, it is worth noting that, through the cooperation between the water tank 33, the water level display 341 and the liquid level switch 342, the water level display 341 can display the liquid level height in the water tank 33 in real time, and the liquid level switch 342 can send an alarm signal to the control system when the liquid level in the water tank 33 is too low, so that the staff can replenish the liquid circulating medium in time. Furthermore, the water supply and drainage assembly 35 includes a water supply port 351, a drainage pipe 352, and a drainage valve 353. The water supply port 351 is connected to the top of one side of the water tank 33; the drainage pipe 352 is connected to the bottom of one side of the water tank 33; and the drainage valve 353 is installed at the end of the drainage pipe 352 away from the water tank 33. The water supply port 351, the drainage pipe 352, and the drainage valve 353 cooperate to replenish the circulating medium in the water tank 33 or discharge the circulating medium in the water tank 33. In the specific implementation process, it is worth noting that, through the cooperation between the water tank 33, the water supply port 351, the drain pipe 352 and the drain valve 353, it is possible to replenish the circulating medium in the water tank 33 when the liquid circulating medium is insufficient, and to discharge the circulating medium in the water tank 33 when the liquid circulating medium needs to be replaced; Furthermore, the internal circulation component 4 includes a second plate heat exchanger 401, an internal circulation pump 402, a first compressor 403, a fin radiator 404, a first oil separator 405, a liquid reservoir 406, a third plate heat exchanger 407, a filter 408, a second compressor 409, a second oil separator 410 and an expansion valve 411. The second plate heat exchanger 401 is arranged on a side of the shell 1 close to the water tank 33, and the output end on one side is connected to the top of the water tank 33; the internal circulation pump 402 is arranged on one side of the external circulation pump 31, and the input end is connected to the bottom of the water tank 33, and the output end is connected to the input end of the second plate heat exchanger 401 close to the water tank 33. The first compressor 403 is arranged on the side of the shell 1 away from the external circulation pump 31, and the output end is connected to the input end of the second plate heat exchanger 401 away from the water tank 33; the fin radiator 404 is arranged on the upper inner side of the shell 1, and the output end on one side is connected to the input end of the first compressor 403; the output end of the first oil separator 405 is connected to the input end of the fin radiator 404 on one side; the input end of the liquid reservoir 406 is connected to the input end of the first oil separator 405, and the output end is connected to the input end of the second plate heat exchanger 401; the third plate heat exchanger 407 is arranged on one side of the second plate heat exchanger 401, and the input end on one side is connected to the second plate heat exchanger The output end of the filter 408 is connected to the output end of the fin radiator 404 away from the first compressor 403, and the output end is connected to the input end of the third plate heat exchanger 407 away from the second plate heat exchanger 401; the second compressor 409 is arranged on one side of the first compressor 403, and the input end is connected to the output end of the third plate heat exchanger 407 away from the second plate heat exchanger 401; the second oil separator 410 is arranged on one side of the second compressor 409, and the input end is connected to the output end of the second compressor 409, and the output end is connected to the fin radiator 404 away from the first compressor 403. The fin radiator 404 is located at an input end on a side away from the first compressor 403; the expansion valve 411 is installed at an input end of the third plate heat exchanger 407 on a side away from the second plate heat exchanger 401; wherein, the high-temperature circulating medium in the liquid reservoir 406 is circulated between the fin radiator 404 and the second plate heat exchanger 401 through the first compressor 403, and heat is exchanged between the liquid circulating medium in the water tank 33 and the high-temperature circulating refrigerant in the second plate heat exchanger 401; the low-temperature circulating medium is circulated between the fin radiator 404 and the third plate heat exchanger 407 through the second compressor 409, and heat is exchanged between the high-temperature and low-temperature circulating refrigerants in the third plate heat exchanger 407; In the specific implementation process, it is worth noting that, through the cooperation among the water tank 33, the second plate heat exchanger 401 and the internal circulation pump 402, by controlling the internal circulation pump 402, the circulation delivery of the liquid circulating medium in the water tank 33 to the second plate heat exchanger 401 is realized, and through the cooperation among the second plate heat exchanger 401, the first compressor 403, the fin radiator 404, the first oil separator 405, the liquid reservoir 406 and the third plate heat exchanger 407, the liquid reservoir 406 stores high-temperature circulating refrigerant, and by controlling the first compressor 403, the circulation delivery of the high-temperature circulating refrigerant among the second plate heat exchanger 401, the fin radiator 404, the liquid reservoir 406 and the third plate heat exchanger 407 is realized, and The heat exchange is carried out with the liquid circulating medium inside the second plate heat exchanger 401, and the liquid high-temperature circulating refrigerant is converted into a gaseous high-temperature circulating refrigerant after absorbing heat. The gaseous high-temperature circulating refrigerant dissipates heat in the third plate heat exchanger 407, and is compressed by the first compressor 403, and is converted back into a liquid high-temperature circulating refrigerant and circulated again. Through the cooperation between the fin radiator 404, the third plate heat exchanger 407, the second compressor 409, the second oil separator 410 and the expansion valve 411, the low-temperature circulating refrigerant is circulated and transported between the third plate heat exchanger 407 and the fin radiator 404 by controlling the second compressor 409, and the low-temperature circulating refrigerant is exchanged with the high-temperature circulating medium inside the third plate heat exchanger 407. The liquid low-temperature circulating refrigerant is converted into a gaseous low-temperature circulating refrigerant inside the third plate heat exchanger 407 and absorbs the heat of the high-temperature refrigerant. After the gaseous low-temperature circulating refrigerant dissipates heat through the fin radiator 404, it is compressed by the second compressor 409 and converted back into a liquid low-temperature circulating refrigerant and circulated again. Through the cooperation between the second plate heat exchanger 401, the internal circulation pump 402, the first compressor 403, the fin radiator 404, the first oil separator 405, the liquid reservoir 406, the third plate heat exchanger 407, the filter 408, the second compressor 409, the second oil separator 410 and the expansion valve 411, two independent refrigeration circulation systems are formed inside the refrigeration unit. In the high-temperature refrigeration cycle system, the first compressor 403 drives the high-temperature circulating refrigerant to circulate between the fin radiator 404, the second plate heat exchanger 401, the liquid accumulator 406 and the third plate heat exchanger 407, absorbing heat in the second plate heat exchanger 401 and releasing heat in the third plate heat exchanger 407 and the fin radiator 404. In the low-temperature refrigeration cycle system, the second compressor 409 drives the low-temperature circulating refrigerant to circulate between the third plate heat exchanger 407 and the fin radiator 404, absorbing heat in the third plate heat exchanger 407 and releasing heat in the fin radiator 404, ensuring that the heat of the high-temperature circulating refrigerant can be quickly transferred and released, thereby realizing the function of high-low temperature cascade refrigeration.The liquid circulating medium in the water tank 33 is efficiently refrigerated to achieve ultra-low temperature refrigeration. The specific models of the first compressor 403 and the second compressor 409 are not limited, and they can meet the use requirements. Furthermore, the power distribution control assembly 5 includes a distribution box 51, a box door 52, a controller 53, a control panel 54, a pressure gauge 55, a temperature measuring assembly 56 and a fault alarm assembly 57. The distribution box 51 is fixedly connected to the side of the shell 1 away from the water tank 33; the box door 52 is rotatably connected to the side of the distribution box 51; the controller 53 is installed inside the distribution box 51; the control panel 54 is installed on the outer wall of the box door 52; a plurality of pressure gauges 55 are provided, which are evenly distributed above the distribution box 51; the temperature measuring assembly 56 is provided on the side away from the distribution box 51; the fault alarm assembly 57 is provided on the top of the shell 1; wherein, the operation of the refrigeration equipment is controlled by the controller 53 and the control panel 54, the pressure gauge 55 displays the pressure of each pipeline of the refrigeration equipment, the temperature measuring assembly 56 senses the output temperature of the refrigeration equipment, and the fault alarm assembly 57 alarms when an operating failure occurs in the refrigeration equipment; During the specific implementation process, it is worth noting that the controller 53 is installed inside the distribution box 51 and controls various electrical components according to a preset algorithm. The control panel 54 is used to display the operating status and various parameters of the refrigeration equipment, which facilitates the operator to monitor and adjust the unit in real time. The pressure gauge 55 allows the operator to intuitively understand the working pressure of each pipeline of the refrigeration equipment, thereby determining whether the unit is in a normal working state. The temperature measuring component 56 accurately senses the output temperature of the refrigeration equipment, which facilitates the controller 53 to adaptively adjust the operation of the refrigeration equipment. The fault alarm component 57 is used to alarm when the refrigeration equipment has an operating fault. The specific models of the controller 53 and the control panel 54 are not limited and can meet the usage requirements. Furthermore, the temperature measuring assembly 56 includes a first temperature sensor 561 and a second temperature sensor 562. The first temperature sensor 561 is installed on one side of the outer wall of the water tank 33 and is electrically connected to the controller 53. Two second temperature sensors 562 are provided, which are respectively installed on the top of the circulation pipe 2 and are electrically connected to the controller 53. Among them, the first temperature sensor 561 measures the temperature of the liquid circulating medium in the water tank 33, and the second temperature sensor 562 measures the temperature of the liquid circulating medium in the circulation pipe 2. During the specific implementation process, it is worth noting that the first temperature sensor 561 measures the temperature of the liquid circulating medium in the water tank 33, and the second temperature sensor 562 measures the temperature of the circulating medium transported in the circulation pipe 2, and transmits the measurement signal to the controller 53 in real time, so that the control system of the refrigeration equipment can accurately control the temperature of the refrigeration unit according to the real-time temperature data, so as to quickly respond to changes in the ambient temperature and ensure that the refrigeration unit can operate stably under different working conditions and achieve the best cooling effect. The specific models of the first temperature sensor 561 and the second temperature sensor 562 are not limited and can meet the use requirements. Furthermore, the fault alarm component 57 includes an audible and visual alarm 571 and a signal transmitter 572. The audible and visual alarm 571 is installed on one side of the top of the housing 1 and is electrically connected to the controller 53. The signal transmitter 572 is installed on one side of the top of the housing 1 away from the audible and visual alarm 571 and is electrically connected to the controller 53. When an operational fault occurs in the refrigeration equipment, the audible and visual alarm 571 receives a fault signal from the controller 53 and issues an audible and visual alarm. The signal transmitter 572 transmits the operating status of the refrigeration equipment to the workshop control center in real time. In the specific implementation process, it is worth noting that the signal transmitter 572 transmits the operating status of the refrigeration equipment to the workshop control center in real time. When the refrigeration equipment fails to operate, the controller 53 sends a fault signal to the workshop control center and simultaneously issues an audible and visual alarm through the audible and visual alarm 571, so that the staff can quickly deal with the operating failure. The specific models of the audible and visual alarm 571 and the signal transmitter 572 are not limited and can meet the use requirements. Furthermore, a heat dissipation assembly 6 is provided on the top of the housing 1. The heat dissipation assembly 6 includes a first heat dissipation hole 61, a blower 62, a heat dissipation fan 63, and a second heat dissipation hole 64. The first heat dissipation hole 61 is equidistantly provided on both sides of the outer wall of the housing 1; two blowers 62 are provided, distributed on the top of the fin heat sink 404; two heat dissipation fans 63 are provided, installed on one side of the inner wall of the distribution box 51; a plurality of second heat dissipation holes 64 are provided, equidistantly provided on both sides of the outer wall of the distribution box 51; wherein, the cooperation of the first heat dissipation hole 61 and the blower 62 allows air to circulate inside the housing 1, and the cooperation of the heat dissipation fan 63 and the second heat dissipation hole 64 allows air to circulate inside the distribution box 51; During the specific implementation process, it is worth noting that the cooperation between the first heat dissipation hole 61 and the fan 62 allows the air inside the housing 1 to circulate quickly, while dissipating heat to the finned heat sink 404, ensuring that the refrigeration unit maintains a stable operating state. The cooperation between the heat dissipation fan 63 and the second heat dissipation hole 64 allows the air inside the distribution box 51 to circulate quickly, effectively preventing circuit failures caused by excessive temperature in the distribution box 51, thereby improving the safety and reliability of the refrigeration unit. The specific models of the fan 62 and the heat dissipation fan 63 are not limited, and can be used as long as they meet the requirements. Furthermore, moving wheels 7 are installed on both sides of the bottom of the housing 1; In the specific implementation process, it is worth noting that the moving wheel 7 is used to improve the mobility of the cascade refrigeration unit; Specifically, when the high-low temperature cascade refrigeration unit is used, liquid circulating medium is stored inside the water tank 33, and the liquid circulating medium is circulated between the water tank 33 and the first plate heat exchanger 32 through the external circulation pump 31. The low-temperature liquid circulating medium absorbs the heat of the external circulating medium transported by the circulation pipe 2 inside the first plate heat exchanger 32, and the liquid circulating medium in the water tank 33 is circulated to the second plate heat exchanger 401 through the internal circulation pump 402. In the high-temperature refrigeration cycle system, the high-temperature circulating refrigerant is pushed to circulate between the fin radiator 404, the second plate heat exchanger 401, the liquid storage tank 406 and the third plate heat exchanger 407 through the operation of the first compressor 403, absorbs the heat of the liquid circulating medium in the second plate heat exchanger 401, and releases the heat in the third plate heat exchanger 407 and the fin radiator 404. Heat release. In the low-temperature refrigeration cycle system, the second compressor 409 drives the low-temperature circulating refrigerant to circulate between the third plate heat exchanger 407 and the fin radiator 404, absorbs heat in the third plate heat exchanger 407, and releases heat in the fin radiator 404, ensuring that the heat of the high-temperature circulating refrigerant can be quickly transferred and released. When the set temperature of the liquid circulating medium is high, only the high-temperature refrigeration cycle system is used to achieve refrigeration of the liquid circulating medium. When the set temperature of the liquid circulating medium is low or the temperature of the external circulating medium fluctuates greatly, the high-temperature refrigeration cycle system and the low-temperature refrigeration cycle system work simultaneously to reduce the thermal load in the refrigeration unit, improve the efficiency of heat transfer, and deeply cool the liquid circulating medium to ensure that the temperature of the liquid circulating medium can be quickly reduced to within the set temperature range, thereby achieving the effect of ultra-low temperature refrigeration.

[0025] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-low temperature cascade refrigeration unit, comprising a housing (1), characterized in that: Circulation pipes (2) are equidistantly arranged at the bottom of one side of the shell (1), and the high-low temperature cascade refrigeration unit further comprises: An external circulation component (3) is arranged inside the shell (1) on a side close to the circulation pipe (2); An internal circulation component (4) is arranged inside the shell (1) on a side away from the circulation pipe (2); A power distribution control component (5) is arranged on a side of the housing (1) away from the circulation pipe (2); The circulating medium of the outer circulation component (3) exchanges heat with the circulating medium transported by the circulation pipe (2), the inner circulation component (4) exchanges heat with the circulating medium of the outer circulation component (3), and the power distribution control component (5) controls the operation of the entire unit.

2. A high and low temperature cascade refrigeration unit according to claim 1, characterized in that: The outer circulation component (3) comprises: An external circulation pump (31) is installed at the inner bottom of the housing (1); A first plate heat exchanger (32) is installed at the bottom of the shell (1) and is located on one side of the external circulation pump (31), and the input end on one side is connected to the output end of the external circulation pump (31), and the input end and the output end on the other side are respectively connected to the two circulation pipes (2); A water tank (33) is installed inside the housing (1) and is located above the external circulation pump (31), with the bottom portion being connected to the input end of the external circulation pump (31) and the top portion being connected to the output end of the first plate heat exchanger (32) away from the circulation pipe (2); A water level monitoring component (34) is provided on one side of the water tank (33); A water supply and drainage assembly (35) is arranged outside the water tank (33); The external circulation pump (31), the first plate heat exchanger (32) and the water tank (33) cooperate to circulate the circulating medium between the water tank (33) and the first plate heat exchanger (32), and the first plate heat exchanger (32) exchanges heat between the circulating medium in the water tank (33) and the circulating medium input from the outside.

3. The high-low temperature cascade refrigeration unit according to claim 2, characterized in that: The water level monitoring component (34) comprises: A water level display (341) is provided on one side of the housing (1) and is in communication with the water tank (33); A liquid level switch (342) is mounted on one side of the outer wall of the water tank (33); The water level display (341) can display the liquid level height in the water tank (33) in real time, and the liquid level switch (342) can send an alarm signal to the control system when the liquid level in the water tank (33) is too low.

4. The high-low temperature cascade refrigeration unit according to claim 3, characterized in that: The drainage assembly (35) comprises: A water supply port (351) is connected to the top of one side of the water tank (33); A drainage pipe (352) is connected to the bottom of one side of the water tank (33); A drain valve (353) is installed at one end of the drain pipe (352) away from the water tank (33); The water supply port (351), the drainage pipe (352) and the drainage valve (353) cooperate to replenish the circulating medium in the water tank (33) or discharge the circulating medium in the water tank (33).

5. The high and low temperature cascade refrigeration unit according to claim 4, characterized in that: The inner circulation component (4) comprises: The second plate heat exchanger (401) is arranged on a side of the housing (1) close to the water tank (33), and the output end on the side is connected to the top of the water tank (33); An internal circulation pump (402) is provided on one side of the external circulation pump (31), and its input end is connected to the bottom of the water tank (33), and its output end is connected to the input end of the second plate heat exchanger (401) on the side close to the water tank (33); The first compressor (403) is arranged on a side of the housing (1) away from the external circulation pump (31), and the output end is connected to the input end of the second plate heat exchanger (401) on a side away from the water tank (33); A finned heat sink (404) is arranged above the inner side of the shell (1), and the output end on one side is connected to the input end of the first compressor (403); A first oil separator (405), the output end of which is connected to the input end of the finned heat sink (404) located on one side; A liquid reservoir (406), the input end of which is connected to the input end of the first oil separator (405), and the output end of which is connected to the input end of the second plate heat exchanger (401); The third plate heat exchanger (407) is arranged on one side of the second plate heat exchanger (401), and the input end on the one side is connected to the output end of the second plate heat exchanger (401), and the output end close to the second plate heat exchanger (401) is connected to the input end of the first oil separator (405); A filter (408), the input end of which is connected to the output end of the finned heat sink (404) on the side away from the first compressor (403), and the output end of which is connected to the input end of the third plate heat exchanger (407) on the side away from the second plate heat exchanger (401); The second compressor (409) is arranged on one side of the first compressor (403), and the input end and the third plate heat exchanger (407) are far away from the output end on one side of the second plate heat exchanger (401); The second oil separator (410) is provided on one side of the second compressor (409), and its input end is connected to the output end of the second compressor (409), and its output end is connected to the input end of the finned heat sink (404) on the side away from the first compressor (403); an expansion valve (411), installed at an input end of the third plate heat exchanger (407) on a side away from the second plate heat exchanger (401); The high-temperature circulating medium in the liquid storage device (406) is circulated between the fin radiator (404) and the second plate heat exchanger (401) by the first compressor (403), and heat exchange is performed between the liquid circulating medium in the water tank (33) and the high-temperature circulating refrigerant in the second plate heat exchanger (401). The low-temperature circulating medium is circulated between the fin radiator (404) and the third plate heat exchanger (407) by the second compressor (409), and heat exchange is performed between the high-temperature and low-temperature circulating refrigerants in the third plate heat exchanger (407).

6. The high-low temperature cascade refrigeration unit according to claim 5, characterized in that: The power distribution control component (5) comprises: A distribution box (51) is fixedly connected to a side of the housing (1) away from the water tank (33); A box door (52) is rotatably connected to one side of the distribution box (51); A controller (53) is installed inside the distribution box (51); A control panel (54) is mounted on the outer wall of the door (52); A plurality of pressure gauges (55) are provided and are evenly distributed above the distribution box (51); A temperature measuring component (56) is arranged on a side away from the distribution box (51); A fault alarm component (57) is arranged on the top of the housing (1); The operation of the refrigeration equipment is controlled by the controller (53) and the control panel (54), the pressure gauge (55) displays the pressure of each pipeline of the refrigeration equipment, the temperature measuring component (56) senses the output temperature of the refrigeration equipment, and the fault alarm component (57) issues an alarm when an operational fault occurs in the refrigeration equipment.

7. The high-low temperature cascade refrigeration unit according to claim 6, characterized in that: The temperature measuring component (56) includes: A first temperature sensor (561) is installed on one side of the outer wall of the water tank (33) and is electrically connected to the controller (53); Two second temperature sensors (562) are provided, each mounted on the top of the circulation pipe (2) and electrically connected to the controller (53); The first temperature sensor (561) measures the temperature of the liquid circulating medium in the water tank (33), and the second temperature sensor (562) measures the temperature of the liquid circulating medium in the circulation pipe (2).

8. The high-low temperature cascade refrigeration unit according to claim 7, characterized in that: The fault alarm component (57) comprises: An audible and visual alarm (571) is mounted on one side of the top of the housing (1) and is electrically connected to the controller (53); A signal transmitter (572) is mounted on the top of the housing (1) on a side away from the sound and light alarm (571) and is electrically connected to the controller (53); When an operating failure occurs in the refrigeration equipment, the sound and light alarm (571) emits an sound and light alarm after receiving a fault signal from the controller (53), and the signal transmitter (572) transmits the operating status of the refrigeration equipment to the workshop control center in real time.

9. The high and low temperature cascade refrigeration unit according to claim 8, characterized in that: A heat dissipation component (6) is provided on the top of the housing (1), and the heat dissipation component (6) comprises: First heat dissipation holes (61) are equidistantly provided on both sides of the outer wall of the housing (1); Two fans (62) are provided and distributed on the top of the finned heat sink (404); Two cooling fans (63) are provided and installed on one side of the inner wall of the distribution box (51); A plurality of second heat dissipation holes (64) are provided and are equidistantly opened on both sides of the outer wall of the distribution box (51); The first heat dissipation hole (61) and the fan (62) cooperate to allow air to circulate inside the housing (1), and the heat dissipation fan (63) and the second heat dissipation hole (64) cooperate to allow air to circulate inside the distribution box (51).

10. The high-low temperature cascade refrigeration unit according to claim 9, characterized in that: Moving wheels (7) are installed on both sides of the bottom of the housing (1).

Images