Refrigeration unit, air conditioner, and valve control method

Abstract

The application discloses a refrigerating unit, an air conditioner and a valve control method, and relates to the technical field of refrigeration. The refrigerating unit comprises a compressor, a condenser, a supercooling assembly and an evaporator. In the technical scheme, the refrigerants in the two supercooling devices are alternately static, the refrigerant in one supercooling device is static and then gas-liquid separation is performed, the flash vapor after separation is compressed by the compressor, the liquid part flows into the evaporator to absorb heat and refrigerate, and the refrigerant in the other supercooling device is static. The refrigerant in the static state is cooled by changing the evaporation temperature of the heat exchanger, and then gas-liquid separation is performed. The refrigerant flowing into the evaporator is deeply cooled by alternating static cooling, the refrigerant in the evaporator is prevented from being cooled and heated at the same time, the refrigerating capacity of the heat exchanger is improved, and the system energy efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to a refrigeration unit, an air conditioner, and a valve control method. Background Technology

[0002] A refrigeration unit is a combination of machines that transfer heat from a cooled object at a lower temperature to the surrounding environment to obtain cooling capacity. The heat transferred from the lower-temperature object is conventionally called cooling capacity, and the working fluid in the refrigeration unit that participates in the thermodynamic process (energy conversion and heat transfer) is called refrigerant. Refrigeration units are widely used in industrial and agricultural production and daily life.

[0003] Current energy-saving technologies for refrigeration processes mainly focus on increasing the cooling capacity per unit refrigerant and reducing compressor power consumption. However, the increase in cooling capacity from recooling and reheating is limited (approximately 3%), and the reduction in compressor power consumption in multi-stage compression refrigeration cycles with flash vapor is also limited (approximately 5%). Therefore, more advanced refrigeration processes need to be developed for energy-saving design. Furthermore, traditional multi-stage compression refrigeration cycles with flash vapor require an additional throttling device compared to traditional chillers, which can lead to some cooling capacity loss in practical applications.

[0004] Energy-saving solutions for building air conditioning systems are of paramount importance. Therefore, more advanced and efficient refrigeration processes are needed to address the problems of high costs and small improvements in energy efficiency of existing refrigeration systems. Summary of the Invention

[0005] The main objective of this invention is to propose a refrigeration unit, air conditioner, and valve control method that aims to significantly reduce compressor power consumption.

[0006] To achieve the above objectives, the present invention proposes a refrigeration unit, which includes a compressor, a condenser, a subcooling assembly, and an evaporator. The compressor is piped to the condenser, and the evaporator is piped to the compressor. The subcooling assembly includes...

[0007] At least two subcoolers are provided, each subcooler being connected to a condenser pipe, and a first switching valve is provided on the pipe between the condenser and each subcooler; each subcooler is connected to an evaporator pipe, and a second switching valve is provided on the pipe between the evaporator and each subcooler; each subcooler is connected to a compressor pipe, and a third switching valve is provided on the pipe between the compressor and each subcooler.

[0008] At least two heat exchangers, each heat exchanger being disposed within one of the subcoolers; and

[0009] The chiller is connected to the pipes of each of the heat exchangers, and a fourth switch valve is provided on the pipes between the chiller and each of the heat exchangers.

[0010] In one embodiment, the subcooling assembly further includes a pressure control valve located on the pipe connecting each of the subcoolers to the compressor, and used to control the pressure of refrigerant vapor flowing from each subcooler to the compressor.

[0011] In one embodiment, the subcooling assembly further includes a piping assembly, which includes a main pressure pipe and at least two branch pressure pipes. Each branch pressure pipe is connected to a subcooler pipe, and each third switching valve is located on a branch pressure pipe. The end of each branch pressure pipe away from the corresponding subcooler is connected to the main pressure pipe, and the end of the main pressure pipe away from each branch pressure pipe is connected to the compressor pipe. The pressure control valve is located on the main pressure pipe.

[0012] In one embodiment, the subcooling component further includes a monitoring component, which includes at least two pressure sensors, each pressure sensor being disposed within one of the subcoolers, and each pressure sensor being used to monitor the pressure value inside each of the subcoolers.

[0013] In one embodiment, the monitoring component further includes at least two temperature sensors, each of which is disposed within a supercooler, and each temperature sensor is used to monitor the temperature value inside each supercooler.

[0014] In one embodiment, the piping assembly further includes a throttling valve, a throttling main pipe, and at least two throttling branch pipes. Each throttling branch pipe is connected to a subcooler pipe, and each of the second switching valves is located on a throttling branch pipe. The end of each throttling branch pipe away from the corresponding subcooler is connected to the throttling main pipe, and the end of the throttling main pipe away from each of the throttling branch pipes is connected to the evaporator pipe. The throttling valve is located on the throttling main pipe.

[0015] In one embodiment, the refrigeration unit further includes a flow meter, which is disposed on the pipe connecting the condenser and the compressor and is used to monitor the flow rate of refrigerant flowing out of the compressor;

[0016] The piping assembly also includes a throttling bypass and a regulating valve, wherein the condenser is connected to the throttling valve via the throttling bypass piping; the regulating valve is located in the throttling bypass.

[0017] In one embodiment, the chiller is a variable evaporation temperature chiller.

[0018] The present invention also proposes an air conditioner, comprising:

[0019] At least two subcoolers are provided, each subcooler being connected to a condenser pipe, and a first switching valve is provided on the pipe between the condenser and each subcooler; each subcooler is connected to an evaporator pipe, and a second switching valve is provided on the pipe between the evaporator and each subcooler; each subcooler is connected to a compressor pipe, and a third switching valve is provided on the pipe between the compressor and each subcooler.

[0020] At least two heat exchangers, each heat exchanger being disposed within one of the subcoolers; and

[0021] The chiller is connected to the pipes of each of the heat exchangers, and a fourth switch valve is provided on the pipes between the chiller and each of the heat exchangers.

[0022] This invention also proposes a valve control method, comprising:

[0023] Set the release completion temperature T2;

[0024] The temperature T1 of the refrigerant in the evaporator is obtained; the flow resistance P0 of the refrigerant in each of the subcoolers flowing through the throttle valve, the evaporator and the compressor inlet is obtained; and the minimum pressure value P1 of the compressor suction port is obtained.

[0025] Obtain the temperature sensor value T, and obtain the pressure sensor value P;

[0026] Set the subcooler to a preliminary static cooling temperature and obtain the condenser outlet temperature T2;

[0027] The temperature T1 of the refrigerant in the evaporator is obtained; the flow resistance P0 of the refrigerant in each of the subcoolers flowing through the throttle valve, the evaporator and the compressor inlet is obtained; and the minimum pressure value P1 of the compressor suction port is obtained.

[0028] Obtain the temperature sensor value T, and obtain the pressure sensor value P;

[0029] When one of the supercoolers is cooled:

[0030] Compare the size of T with T4, compare the size of T with T1, compare the size of T with T2, compare the size of P with P1+P0+(P1+P0)*0.2, and compare the size of P with (P1+P0).

[0031] When T > T4 and P < P1 + P + (P1 + P0) * 0.2, the third switch valve is closed, the second switch valve is closed, and the first switch valve is opened, so that the liquid refrigerant generated by the condenser enters the subcooler, increases the internal pressure, and is allowed to cool down to T4℃.

[0032] When T1 < T < T4, close the third switch valve, close the second switch valve, close the first switch valve, and open the fourth valve to cool the refrigerant inside the subcooler to T1 using a variable evaporation temperature chiller.

[0033] When releasing cold energy:

[0034] Set the release completion temperature T5;

[0035] When T=T1, close the fourth switch valve, close the third switch valve, and open the second switch valve; at the same time, control the first switch valve so that P>P1+P0;

[0036] When T > T5, open the third switch valve, close the second switch valve, close the fourth switch valve, and open the first switch valve.

[0037] In the technical solution of this invention, the refrigeration unit includes a compressor, a condenser, a subcooling assembly, and an evaporator. The compressor is connected to the condenser by a pipeline, and the evaporator is connected to the compressor by a pipeline. The subcooling assembly includes at least two subcoolers, at least two heat exchangers, and a chiller. Each subcooler is connected to the condenser by a pipeline, and a first switching valve is provided on the pipeline between the condenser and each subcooler. Each subcooler is connected to the evaporator by a pipeline, and a second switching valve is provided on the pipeline between the evaporator and each subcooler. Each subcooler is connected to the compressor by a pipeline, and a third switching valve is provided on the pipeline between the compressor and each subcooler. Each heat exchanger is located inside a subcooler. The chiller is connected to each heat exchanger by a pipeline, and a fourth switching valve is provided on the pipeline between the chiller and each heat exchanger. In the technical solution of this invention, the refrigerant in the two subcoolers is alternately allowed to stand. After the refrigerant in one subcooler has finished standing, gas-liquid separation is performed. The separated flash vapor enters the compressor for compression, and the liquid part flows into the evaporator to absorb heat and cool down. At the same time, the refrigerant in the other subcooler is allowed to stand. The refrigerant in the standing position is cooled down through heat exchange in the refrigeration unit, and the refrigerant gas-liquid separation is achieved. This alternating standing and cooling allows the refrigerant flowing into the evaporator to be deeply cooled, avoiding the cancellation of heat and cold in the refrigerant in the evaporator, thereby increasing the cooling capacity of the refrigeration unit and improving the system energy efficiency. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of a refrigeration unit according to an embodiment of the present invention;

[0040] Figure 2 A flowchart of the valve control method provided by the present invention.

[0041] Explanation of icon numbers:

[0042]

[0043] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0045] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0046] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0047] This invention proposes a refrigeration unit 1000.

[0048] Please see Figure 1 In the technical solution of the present invention, the refrigeration unit 1000 includes a compressor 1, a condenser 2, a subcooling assembly, and an evaporator 4. The compressor 1 is connected to the condenser 2 by a pipeline, and the evaporator 4 is connected to the compressor 1 by a pipeline. The subcooling assembly includes at least two subcoolers 31, at least two heat exchangers 32, and a chiller. Each subcooler 31 is connected to the condenser 2 by a pipeline, and a first switching valve 301 is provided on the pipeline between the condenser 2 and each subcooler 31. Each subcooler 31 is connected to the evaporator 4 by a pipeline, and a second switching valve 302 is provided on the pipeline between the evaporator 4 and each subcooler 31. Each subcooler 31 is connected to the compressor 1 by a pipeline, and a third switching valve 303 is provided on the pipeline between the compressor 1 and each subcooler 31. Each heat exchanger 32 is located inside a subcooler 31. The chiller is connected to each heat exchanger 32 by a pipeline, and a fourth switching valve 304 is provided on the pipeline between the chiller and each heat exchanger 32.

[0049] In the technical solution of this invention, the refrigerant in the two subcoolers 31 is alternately placed in a static state. After the refrigerant in one subcooler 31 has completed static placement, gas-liquid separation is performed. The separated flash vapor enters the compressor 1 for compression, and the liquid part flows into the evaporator 4 to absorb heat and cool down. At the same time, the refrigerant in the other subcooler 31 is placed in a static state. The refrigerant in the static state is cooled down through heat exchange in the refrigeration unit, and the refrigerant gas-liquid separation is achieved. This alternating static placement and cooling allows the refrigerant flowing into the evaporator 4 to be deeply cooled, avoiding the cancellation of heat and cold in the refrigerant in the evaporator 4, thereby increasing the cooling capacity of the refrigeration unit and improving the system energy efficiency.

[0050] Taking the energy consumption scenario of traditional air conditioning as an example, in order to produce 7°C low-temperature chilled water, the average temperature of the refrigerant in the evaporator 4 is 5°C. Calculate the energy efficiency improvement of the traditional refrigeration device and the refrigeration unit 1000 provided by the present invention.

[0051] For traditional chillers, when the supply and return water temperatures on the condenser side are 32 / 37℃, and chilled water at 7℃ is stably produced, the chiller's COP is 5.0.

[0052] When the refrigeration unit 1000 of this invention is used, the variable evaporation temperature chiller can continuously adjust the evaporation temperature. The outlet temperature of the condenser 2 is 42°C. The refrigerant in the subcooler 31 needs to be allowed to stand and cooled to 5°C. During the standing process, some of the refrigerant absorbs heat through phase change, causing the 42°C liquid refrigerant to drop to 30°C. Then, the evaporation temperature of the variable evaporation temperature chiller is adjusted sequentially according to 25-20-15-10-5, gradually reducing the refrigerant in the subcooler 31 to 5°C. During the external refrigeration process, the energy efficiency of the variable evaporation temperature chiller is...

[0053]

[0054] The gaseous refrigerant generated inside the subcooler 31 is delivered to the compressor 1, improving the refrigeration efficiency by approximately 5%. Therefore, after implementing the series of technical measures of this invention, the overall refrigeration efficiency is...

[0055]

[0056] Energy efficiency improvement is

[0057]

[0058] In one embodiment of the invention, the subcooling assembly includes two subcoolers 31 and two heat exchangers 32.

[0059] Please see Figure 1 In one embodiment of the present invention, the subcooling assembly further includes a pressure control valve 34. The pressure control valve 34 is disposed in the pipeline connecting each subcooler 31 to the compressor 1, and is used to control the pressure of the refrigerant vapor flowing from each subcooler 31 to the compressor 1. The pressure control valve 34 can control the internal pressure of each subcooler 31, so that after settling, the low-temperature liquid refrigerant in each subcooler 31 has a sufficiently large pressure difference to overcome the flow resistance from the subcooler 31 to the compressor 1.

[0060] The subcooling assembly also includes a piping assembly comprising a main pressure pipe 351 and at least two branch pressure pipes 352. See also... Figure 1In one embodiment of the present invention, the subcooling assembly further includes a piping assembly, which includes a main pressure pipe 351 and two branch pressure pipes 352. Each branch pressure pipe 352 is connected to a subcooler 31 pipe, and each third switching valve 303 is located on a branch pressure pipe 352. The end of each branch pressure pipe 352 away from the corresponding subcooler 31 is connected to the main pressure pipe 351, and the end of the main pressure pipe 351 away from each branch pressure pipe 352 is connected to the compressor 1 pipe. A pressure control valve 34 is located on the main pressure pipe 351. The pressure control valve 34, located on the main pressure pipe 351, can centrally control the refrigerant vapor from the two subcoolers 31, improving the accuracy and response speed of pressure control. A reasonable piping layout and pressure control can reduce the flow resistance of refrigerant in the piping, reduce energy loss, and improve system efficiency.

[0061] The subcooling assembly also includes a monitoring component, which further includes at least two pressure sensors 361. See also... Figure 1 In one embodiment of the invention, the subcooling assembly further includes a monitoring assembly, which includes two pressure sensors 361. Each pressure sensor 361 is disposed within a subcooler 31, and each pressure sensor 361 is used to monitor the pressure value inside each subcooler 31. The pressure sensors 361 monitor the pressure inside each subcooler 31, providing accurate pressure data. This data can be used to precisely control the operation of the pressure control valve 34, optimize refrigerant flow and pressure control, reduce energy loss, and thus improve the system's energy efficiency. Simultaneously, by monitoring the pressure value, system operating parameters can be adjusted promptly in case of abnormal pressure, preventing damage to critical components such as the compressor 1 and improving the stability of system operation.

[0062] The monitoring components also include at least two temperature sensors 362. See also... Figure 1 In one embodiment of the present invention, the monitoring component further includes two temperature sensors 362, each temperature sensor 362 being disposed within a subcooler 31, and each temperature sensor 362 being used to monitor the temperature value inside each subcooler 31. By setting temperature sensors 362 in each subcooler 31, the temperature changes inside the subcooler 31 can be monitored in real time, allowing for timely understanding of the refrigerant's temperature status; the temperature sensors 362 provide accurate temperature data, which can be used to optimize refrigerant flow and heat exchange efficiency, reduce energy loss, and thus improve system energy efficiency; the addition of temperature sensors 362 enables the system to operate more automatically, reducing manual intervention and improving operational convenience; by monitoring and controlling the temperature in real time, equipment wear caused by temperature anomalies can be reduced, extending the equipment's service life.

[0063] The piping assembly also includes a throttling valve 37, a throttling main pipe 353, and at least two throttling branch pipes 354. See also... Figure 1 In one embodiment of the present invention, the piping assembly further includes a throttling main pipe 353 and two throttling branch pipes 354. Each throttling branch pipe 354 is connected to a subcooler 31 pipe, and each second switching valve 302 is disposed on a throttling branch pipe 354. The end of each throttling branch pipe 354 away from the corresponding subcooler 31 is connected to the throttling main pipe 353 pipe, and the end of the throttling main pipe 353 away from each throttling branch pipe 354 is connected to the evaporator 4 pipe. A throttling valve 37 is disposed on the throttling main pipe 353. By installing a throttling valve 37 on the throttling main pipe 353, centralized control of the refrigerant flow from multiple subcoolers 31 to the evaporator 4 can be achieved, improving the efficiency of flow control. The throttling valve 37 can also control the pressure of the refrigerant entering the evaporator 4, reducing the pressure of the high-pressure liquid refrigerant to a low-temperature, low-pressure liquid refrigerant. At the same time, the throttling valve 37 can also control the superheat of the refrigerant at the outlet of the evaporator 4, maintaining full utilization of the heat transfer area of ​​the evaporator 4, while preventing liquid from being carried into the suction and damaging the compressor 1. The design of the throttling branch pipe 354 and the throttling main pipe 353 allows for independent adjustment of the flow rate of each subcooler 31, and precise control of the flow rate through the throttling valve 37 to adapt to different refrigeration needs.

[0064] To prevent compressor 1 from malfunctioning due to insufficient refrigerant flow during the alternating deep cooling and refrigerant release process of the two subcoolers 31, please refer to [link to relevant documentation]. Figure 1 In one embodiment of the present invention, the refrigeration unit further includes a flow meter, which is installed on the pipe connecting the condenser 2 and the compressor 1, and is used to monitor the flow rate of refrigerant flowing out of the compressor 1; the piping assembly also includes a throttling bypass 355 and a regulating valve 356, with the condenser 2 and the throttling valve 37 connected through the throttling bypass 355 pipe; the regulating valve 356 is located in the throttling bypass 355. This solution adjusts the operating frequency of the compressor 1 and the opening degree of the bypass valve 356 based on real-time flow monitoring at the compressor outlet position to ensure that the refrigerant is at a certain flow level, thereby further ensuring the stable and reliable continuous operation of the system.

[0065] It is understood that the chiller 33 can be a fixed chiller or a variable evaporation temperature chiller. In one embodiment of the present invention, the chiller 33 is a variable evaporation temperature chiller. By using a variable evaporation temperature chiller to cool the refrigerant, the average evaporation temperature of the chiller 33 can be increased, thereby improving the cooling efficiency of the chiller 33 from the external cold source and thus improving the overall energy efficiency of the system.

[0066] The present invention also proposes an air conditioner, which includes a casing and a refrigeration unit 1000. The specific structure of the refrigeration unit 1000 is as described in the above embodiments. Since this air conditioner adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The refrigeration unit 1000 is disposed inside the casing.

[0067] It should be noted that the application scope of the refrigeration unit 1000 includes, but is not limited to, air conditioning, central air conditioning, and cold storage.

[0068] The present invention also proposes a valve control method, including setting the subcooler 31 to initially settle and cool down to temperature T4, obtaining the outlet temperature T2 of the condenser 2; obtaining the temperature T1 of the refrigerant in the evaporator 4, obtaining the flow resistance P0 of the refrigerant in each subcooler 31 flowing through the throttle valve 37, the evaporator 4 and the inlet of the compressor 1, obtaining the minimum pressure value P1 of the suction port of the compressor 1; obtaining the value T of the temperature sensor 362, and obtaining the value P of the pressure sensor 361;

[0069] When one of the subcoolers is cooling down: compare the values ​​of T and T4, T and T1, T and T2, P and P1+P0+(P1+P0)*0.2, and P and (P1+P0); when T>T4 and P<P1+P+(P1+P0)*0.2, close the third switch valve 303, close the second switch valve 302, and open the first switch valve 301, allowing the liquid refrigerant produced by the condenser 2 to enter the subcooler 31, increasing the internal pressure, and allowing it to cool down to T4℃; when T1<T<T4, close the third switch valve 303, close the second switch valve 302, close the first switch valve 301, and open the fourth switch valve 304, using a variable evaporation temperature chiller to cool the refrigerant inside the subcooler 31 to T1;

[0070] When releasing cold energy: Set the release completion temperature T5; when T=T1, close the fourth switch valve 304, close the third switch valve 303, and open the second switch valve 302; simultaneously control the first switch valve 301 to make P>P1+P0, allowing the refrigerant to be released after settling. The gaseous refrigerant flows to the compressor 1, and the liquid refrigerant flows to the evaporator 4. At the same time, close the valve connecting the other subcooler 31 to the evaporator 4 and the compressor 1, stopping the release of refrigerant in the other subcooler 31; when T>T5, open the third switch valve 303, close the second switch valve 302, close the fourth switch valve 304, open the first switch valve 301, close the pipes connecting the subcooler 31 to the chiller, evaporator 4, and compressor 1, and inject refrigerant into the subcooler 31 from the condenser 2 to prepare for settling. At the same time, open the valve connecting the other subcooler 31 to the evaporator 4 and the compressor 1 to release the refrigerant in the other subcooler 31. This allows the automatic opening and closing of all valves in the refrigeration unit 1000 based on operating conditions, temperature, pressure, and other parameters, thereby achieving automated operation of the refrigeration unit 1000.

[0071] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A refrigeration unit (1000) comprising a compressor (1), a condenser (2), a subcooling assembly and an evaporator (4), said compressor (1) being piped to said condenser (2), said evaporator (4) being piped to said compressor (1), characterized in that, The supercooling assembly comprises at least two supercoolers (31), each of the supercoolers (31) is connected with the condenser (2) by a pipeline, a first switch valve (301) is arranged on the pipeline between the condenser (2) and each of the supercoolers (31); each of the supercoolers (31) is connected with the evaporator (4) by a pipeline, a second switch valve (302) is arranged on the pipeline between the evaporator (4) and each of the supercoolers (31); each of the supercoolers (31) is connected with the compressor (1) by a pipeline, a third switch valve (303) is arranged on the pipeline between the compressor (1) and each of the supercoolers (31); at least two heat exchangers (32), each of the heat exchangers (32) is arranged in one of the supercoolers (31); and a cooling machine (33), the cooling machine (33) is connected with each of the heat exchangers (32) by a pipeline, a fourth switch valve (304) is arranged on the pipeline between the cooling machine (33) and each of the heat exchangers (32); the supercooling assembly further comprises a monitoring assembly, the monitoring assembly further comprises at least two pressure sensors (361), each of the pressure sensors (361) is arranged in one of the supercoolers (31), and each of the pressure sensors (361) is used for monitoring the pressure value in each of the supercoolers (31); the monitoring assembly further comprises at least two temperature sensors (362), each of the temperature sensors (362) is arranged in one of the supercoolers (31), and each of the temperature sensors (362) is used for monitoring the temperature value in each of the supercoolers (31); the supercooling assembly further comprises a pipeline assembly, the pipeline assembly further comprises a throttling valve (37), a throttling main pipeline (353) and at least two throttling branch pipelines (354), each of the throttling branch pipelines (354) is connected with one of the supercoolers (31) by a pipeline, and each of the second switch valves (302) is arranged in one of the throttling branch pipelines (354); one end of each of the throttling branch pipelines (354) away from the corresponding supercoolers (31) is connected with the throttling main pipeline (353) by a pipeline, and one end of the throttling main pipeline (353) away from each of the throttling branch pipelines (354) is connected with the evaporator (4) by a pipeline; the throttling valve (37) is arranged in the throttling main pipeline (353); The valve control method applied to the refrigeration unit (1000) comprises: setting the supercoolers (31) to be preliminarily and statically cooled to a temperature T4, obtaining the outlet temperature T2 of the condenser (2); obtaining the temperature T1 of the refrigerant in the evaporator (4), obtaining the flow resistance P0 of the refrigerant in each of the supercoolers (31) flowing through the throttling valve (37), the evaporator (4) and the inlet of the compressor (1), and obtaining the minimum pressure value P1 of the suction port of the compressor (1); obtaining the value T of the temperature sensor (362) and the value P of the pressure sensor (361); when one of the supercoolers (31) is cooled, Compare the size of T with T4, compare the size of T with T1, compare the size of T with T2, compare the size of P with P1+P0+(P1+P0)*0.2, and compare the size of P with (P1+P0). When T > T4 and P < P1 + P0 + (P1 + P0) * 0.2, the third switch valve (303) is closed, the second switch valve (302) is closed, and the first switch valve (301) is opened, so that the liquid refrigerant generated by the condenser (2) enters the subcooler (31), increases the internal pressure, and is allowed to cool down to T4. When T1 < T < T4, the third switch valve (303) is closed, the second switch valve (302) is closed, the first switch valve (301) is closed, and the fourth switch valve (304) is opened, so that the refrigerant inside the supercooler (31) is cooled to T1 by the chiller (33); When releasing cold energy: Set the release completion temperature T5; When T=T1, the fourth switch valve (304) is closed, the third switch valve (303) is closed, and the second switch valve (302) is opened; at the same time, the first switch valve (301) is controlled so that P>P1+P0; When T > T5, the third switch valve (303) is opened, the second switch valve (302) is closed, the fourth switch valve (304) is closed, and the first switch valve (301) is opened.

2. The refrigeration pack (1000) as claimed in claim 1, wherein, The subcooling assembly also includes a pressure control valve (34), which is located on the pipe connecting each of the subcoolers (31) and the compressor (1) and is used to control the pressure of the refrigerant vapor flowing from each subcooler (31) to the compressor (1).

3. The refrigeration unit (1000) of claim 1, wherein, The refrigeration unit (1000) also includes a flow meter, which is installed on the pipe connecting the condenser (2) and the compressor (1) and is used to monitor the flow rate of refrigerant flowing out of the compressor (1); The piping assembly also includes a throttling bypass (355) and a regulating valve (356), wherein the condenser (2) is connected to the throttling valve (37) via the throttling bypass (355) pipe; and the regulating valve (356) is located in the throttling bypass (355).

4. The refrigeration unit (1000) of claim 2, wherein, The piping assembly includes a main pressure pipe (351) and at least two branch pressure pipes (352). Each branch pressure pipe (352) is connected to a subcooler (31) pipe. Each third switch valve (303) is located on a branch pressure pipe (352). The end of each branch pressure pipe (352) away from the corresponding subcooler (31) is connected to the main pressure pipe (351). The end of the main pressure pipe (351) away from each branch pressure pipe (352) is connected to the compressor (1) pipe. The pressure control valve (34) is located on the main pressure pipe (351).

5. The refrigeration pack (1000) according to any one of claims 1 to 4, characterized in that, The chiller (33) is a variable evaporation temperature chiller (33).

6. An air conditioner characterized by comprising: The air conditioner includes a housing and a refrigeration unit (1000) as described in any one of claims 1 to 5, wherein the refrigeration unit (1000) is disposed within the housing.

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