Refrigerating unit, air conditioner and valve control method

Abstract

The invention 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 of the invention, gas-liquid separation is completed through alternate standing of refrigerants in two supercoolers and standing of refrigerants in one supercooler; separated flash evaporation steam enters a compressor to be compressed, a liquid part flows into an evaporator to absorb heat and refrigerate, meanwhile, a refrigerant in another subcooler is subjected to standing, the refrigerant in standing is cooled through heat exchange of a variable evaporation temperature refrigerator, and the refrigerant is subjected to gas-liquid separation; by means of alternate standing cooling, the refrigerant flowing into the evaporator is deeply cooled, cold and hot offset of the refrigerant in the evaporator is avoided, and therefore the refrigerating capacity of the refrigerator is improved, and the system energy efficiency is improved.

Description

Technical Field

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

[0002] A refrigeration unit is a combination of machines that transfers heat from a cooled object with a lower temperature to an ambient medium to obtain cooling capacity. The heat transferred from the lower temperature object is usually called cooling capacity, and the working fluid that participates in the thermodynamic process change (energy conversion and heat transfer) in the refrigerator is called refrigerant. Refrigerator is widely used in industrial and agricultural production and daily life.

[0003] The energy-saving technology of the existing refrigeration process is mainly designed by increasing the refrigeration capacity of the unit refrigerant and reducing the power consumption of the compressor. However, due to the limited increase in refrigeration capacity brought by recooling and heat recovery (about 3%) and the limited reduction in compressor power consumption (about 5%) of the multi-stage compression refrigeration cycle with flash steam, more advanced refrigeration processes need to be developed in the design of refrigeration energy-saving processes. At the same time, the traditional multi-stage compression refrigeration cycle with flash steam needs to set up a throttling device compared to the traditional chiller, and the throttling device will also cause a certain amount of refrigeration capacity loss in actual application.

[0004] Energy-saving solutions for building air-conditioning systems are particularly important, so more advanced and efficient refrigeration processes are needed to solve the problems of high cost and small energy efficiency improvement faced by existing refrigeration systems. Summary of the invention

[0005] The main purpose of the present invention is to provide a refrigeration unit, an air conditioner and a valve control method, aiming to significantly reduce the power consumption of the compressor.

[0006] To achieve the above object, the present invention provides a refrigeration unit, which comprises a compressor, a condenser, a subcooling component and an evaporator, wherein the compressor is connected to the condenser pipeline, the evaporator is connected to the compressor pipeline, and the subcooling component comprises At least two subcoolers, each of the subcoolers is connected to the condenser pipeline, and a first switch valve is provided on the pipeline between the condenser and each of the subcoolers; each of the subcoolers is connected to the evaporator pipeline, and a second switch valve is provided on the pipeline between the evaporator and each of the subcoolers; each of the subcoolers is connected to the compressor pipeline, and a third switch valve is provided on the pipeline between the compressor and each of the subcoolers; at least two heat exchangers, each heat exchanger being disposed within one of the subcoolers; and A cooling machine is connected to each of the heat exchanger pipelines respectively, and a fourth switch valve is respectively provided on the pipeline between the cooling machine and each of the heat exchangers.

[0007] In one embodiment, the subcooling component further includes a pressure control valve, which is disposed in a pipeline connecting each of the subcoolers and the compressor and is used to control the pressure of the refrigerant vapor from each subcooler flowing to the compressor.

[0008] In one embodiment, the subcooling component also includes a pipeline component, which includes a pressure main pipe and at least two pressure branches, each of the pressure branches is connected to a subcooler pipeline, and each of the third switch valves is arranged on a pressure branch; one end of each of the pressure branches away from the corresponding subcooler is connected to the pressure main pipe, and one end of the pressure main pipe away from each of the pressure branches is connected to the compressor pipeline; the pressure control valve is arranged on the pressure main pipe.

[0009] In one embodiment, the subcooling component further includes a monitoring component, and the monitoring component further includes at least two pressure sensors, each of which is disposed in one of the subcoolers, and each of the pressure sensors is used to monitor the pressure value inside each of the subcoolers.

[0010] In one embodiment, the monitoring component further includes at least two temperature sensors, each of which is disposed in one of the subcoolers, and each of the temperature sensors is used to monitor the temperature value inside each of the subcoolers.

[0011] In one embodiment, the pipeline assembly also includes a throttle valve, a throttling main pipe and at least two throttling branches, each of the throttling branches is respectively connected to a subcooler pipe, and each of the second switch valves is arranged on a throttling branch; one end of each throttling branch away from the corresponding subcooler is connected to the throttling main pipe, and one end of the throttling main pipe away from each throttling branch is connected to the evaporator pipe; the throttling valve is arranged on the throttling main pipe.

[0012] In one embodiment, the refrigeration unit further comprises a flow meter, which is arranged on a pipeline connecting the condenser and the compressor and is used to monitor the flow rate of the refrigerant flowing out of the compressor; The pipeline assembly also includes a throttling bypass and a regulating valve. The condenser is connected to the throttling valve through the throttling bypass pipeline; and the regulating valve is arranged on the throttling bypass.

[0013] In one embodiment, the refrigerator is a variable evaporating temperature refrigerator.

[0014] The present invention also provides an air conditioner, comprising: At least two subcoolers, each of the subcoolers is connected to the condenser pipeline, and a first switch valve is provided on the pipeline between the condenser and each of the subcoolers; each of the subcoolers is connected to the evaporator pipeline, and a second switch valve is provided on the pipeline between the evaporator and each of the subcoolers; each of the subcoolers is connected to the compressor pipeline, and a third switch valve is provided on the pipeline between the compressor and each of the subcoolers; at least two heat exchangers, each heat exchanger being disposed within one of the subcoolers; and A cooling machine is connected to each of the heat exchanger pipelines respectively, and a fourth switch valve is respectively provided on the pipeline between the cooling machine and each of the heat exchangers.

[0015] The present invention also proposes a valve control method, comprising: Set the release completion temperature T2; Obtaining the temperature T1 of the refrigerant in the evaporator, obtaining the flow resistance P0 of the refrigerant in each of the subcoolers flowing through the throttle valve, the evaporator and the compressor inlet, and obtaining the minimum pressure value P1 of the compressor suction port; Obtain the temperature sensor value T, obtain the pressure sensor value P; Set the subcooler to initially stand and cool down to a temperature, and obtain the condenser outlet temperature T2; Obtaining the temperature T1 of the refrigerant in the evaporator, obtaining the flow resistance P0 of the refrigerant in each of the subcoolers flowing through the throttle valve, the evaporator and the compressor inlet, and obtaining the minimum pressure value P1 of the compressor suction port; Obtain the temperature sensor value T, obtain the pressure sensor value P; When one of the subcoolers is cooled: Compare T with T4, compare T with T1, compare T with T2, compare P with P1+P0+(P1+P0)*0.2, and compare P with (P1+P0); 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 left to cool to T4℃; When T1<T<T4, the third switch valve is closed, the second switch valve is closed, the first switch valve is closed, and the fourth valve is opened, so that the refrigerant in the subcooler is cooled to T1 by the variable evaporation temperature cooler; When releasing cold energy: Set the release completion temperature T5; When T=T1, the fourth switch valve is closed, the third switch valve is closed, and the second switch valve is opened; at the same time, the first switch valve is controlled so that P>P1+P0; When T>T5, the third switch valve is opened, the second switch valve is closed, the fourth switch valve is closed, and the first switch valve is opened.

[0016] In the technical solution of the present invention, the refrigeration unit includes a compressor, a condenser, a subcooling component and an evaporator, the compressor is connected to the condenser pipeline, and the evaporator is connected to the compressor pipeline; the subcooling component includes at least two subcoolers, at least two heat exchangers and a cold machine, each subcooler is respectively connected to the condenser pipeline, and a first switch valve is respectively provided on the pipeline between the condenser and each subcooler; each subcooler is respectively connected to the evaporator pipeline, and a second switch valve is respectively provided on the pipeline between the evaporator and each subcooler; each subcooler is respectively connected to the compressor pipeline, and a third switch valve is respectively provided on the pipeline between the compressor and each subcooler; each heat exchanger is arranged in a subcooler; the cold machine is respectively connected to the heat exchanger pipeline, and a fourth switch valve is respectively provided on the pipeline between the cold machine and each heat exchanger. In the technical solution of the present invention, the refrigerants in the two subcoolers are alternately allowed to stand still. The refrigerant in one subcooler is allowed to stand still to complete gas-liquid separation. The separated flash vapor enters the compressor for compression, and the liquid part flows to the evaporator to absorb heat and refrigerate. At the same time, the refrigerant in the other subcooler is allowed to stand still, and the temperature of the standing refrigerant is reduced by heat exchange with the refrigerator, and the refrigerant gas and liquid are separated. Such alternating standing and cooling can deeply cool the refrigerant flowing to the evaporator, avoid the cold and heat offset of the refrigerant in the evaporator, thereby increasing the cooling capacity of the refrigerator and improving the energy efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of an embodiment of a refrigeration unit provided by the present invention; Figure 2 The present invention provides a flow chart of the valve control method.

[0019] Description of Figure Numbers:

[0020] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] The present invention provides a refrigeration unit 1000 .

[0025] See also Figure 1In the technical solution of the present invention, the refrigeration unit 1000 includes a compressor 1, a condenser 2, a subcooling component 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 component includes at least two subcoolers 31, at least two heat exchangers 32 and a cold machine, each of the subcoolers 31 is connected to the condenser 2 by a pipeline, and a first switch valve 301 is provided on the pipeline between the condenser 2 and each of the subcoolers 31; each of the subcoolers 31 is connected to the evaporator 4 by a pipeline, and a second switch valve 302 is provided on the pipeline between the evaporator 4 and each of the subcoolers 31; each of the subcoolers 31 is connected to the compressor 1 by a pipeline, and a third switch valve 303 is provided on the pipeline between the compressor 1 and each of the subcoolers 31; each heat exchanger 32 is arranged in a subcooler 31; the cold machine is connected to each of the heat exchangers 32 by a pipeline, and a fourth switch valve 304 is provided on the pipeline between the cold machine and each of the heat exchangers 32.

[0026] In the technical solution of the present invention, the refrigerants in the two subcoolers 31 are alternately allowed to stand still. The refrigerant in one subcooler 31 is allowed to stand still to complete gas-liquid separation. The separated flash vapor enters the compressor 1 for compression, and the liquid part flows to the evaporator 4 to absorb heat and refrigerate. At the same time, the refrigerant in the other subcooler 31 is allowed to stand still, and the temperature of the standing refrigerant is reduced by heat exchange of the refrigerator, and the refrigerant gas and liquid are separated. Such alternating standing and cooling can deeply cool the refrigerant flowing to the evaporator 4, avoid the cancellation of the cold and heat of the refrigerant in the evaporator 4, thereby improving the cooling capacity of the refrigerator and improving the energy efficiency of the system.

[0027] Taking the traditional air conditioning energy consumption scenario 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, and the energy efficiency improvement of the traditional refrigeration device and the refrigeration unit 1000 provided by the present invention is calculated.

[0028] For traditional chillers, when the cooling water supply and return water temperature on the condensing side is 32 / 37℃, 7℃ chilled water can be stably produced and the chiller energy efficiency COP=5.0.

[0029] When the refrigeration unit 1000 of the present invention is used, the variable evaporation temperature refrigerator can continuously adjust the evaporation temperature of the refrigerator. The outlet temperature of the condenser 2 is 42°C. The refrigerant in the subcooler 31 needs to be left to stand and cooled to 5°C. Part of the refrigerant phase changes and absorbs heat during the standing process, so that the 42°C liquid refrigerant is reduced to 30°C. Then, the evaporation temperature of the variable evaporation temperature refrigerator is adjusted in sequence according to 25-20-15-10-5, so that the refrigerant in the subcooler 31 is gradually reduced to 5°C. During the refrigeration process of the external refrigerator, the energy efficiency of the variable evaporation temperature refrigerator is

[0030] The gaseous refrigerant generated in the subcooler 31 is transported to the compressor 1, which improves the refrigeration energy efficiency by about 5%. Therefore, after the implementation of the series of technical measures of the present invention, the overall refrigeration energy efficiency is

[0031] The energy efficiency improvement is

[0032] In one embodiment of the present invention, the subcooling assembly includes two subcoolers 31 and two heat exchangers 32 .

[0033] See also Figure 1 In one embodiment of the present invention, the subcooling assembly further includes a pressure control valve 34, which is disposed in a pipeline connecting each subcooler 31 and the compressor 1, and is used to control the pressure of the refrigerant vapor from each subcooler 31 flowing to the compressor 1. The pressure control valve 34 can control the internal pressure of each subcooler 31, so that after the static state is completed, 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.

[0034] The subcooling assembly further includes a pipeline assembly, which includes a pressure main pipe 351 and at least two pressure branches 352. Figure 1 In one embodiment of the present invention, the subcooling assembly further includes a pipeline assembly, which includes a pressure main pipe 351 and two pressure branches 352, each of which is connected to a subcooler 31 pipeline, and each third switch valve 303 is arranged on a pressure branch pipe 352; one end of each pressure branch pipe 352 away from the corresponding subcooler 31 is connected to the pressure main pipe 351 pipeline, and one end of the pressure main pipe 351 away from each pressure branch pipe 352 is connected to the compressor 1 pipeline; the pressure control valve 34 is arranged on the pressure main pipe 351. The pressure control valve 34 is arranged on the pressure main pipe 351, which can centrally control the refrigerant vapor from the two subcoolers 31, thereby improving the accuracy and response speed of pressure control; reasonable pipeline layout and pressure control can reduce the flow resistance of the refrigerant in the pipeline, reduce energy loss, and improve system efficiency.

[0035] The subcooling assembly also includes a monitoring assembly, which also includes at least two pressure sensors 361. Figure 1In one embodiment of the invention, the subcooling assembly also includes a monitoring assembly, and the monitoring assembly also includes two pressure sensors 361, each of which is arranged in a subcooler 31, and each pressure sensor 361 is used to monitor the pressure value inside each subcooler 31. The pressure sensor 361 is used to monitor the pressure inside each subcooler 31, and can provide accurate pressure data, which can be used to accurately control the operation of the pressure control valve 34, optimize the flow and pressure control of the refrigerant, reduce energy loss, and thus improve the energy efficiency of the system. At the same time, by monitoring the pressure value, the system operating parameters can be adjusted in time when the pressure is abnormal, to avoid damage to key components such as the compressor 1, and to improve the stability of the system operation.

[0036] The monitoring assembly also includes at least two temperature sensors 362. Figure 1 In one embodiment of the present invention, the monitoring component further includes two temperature sensors 362, each of which is disposed in a subcooler 31, and each temperature sensor 362 is used to monitor the temperature value inside each subcooler 31. By arranging the temperature sensor 362 in each subcooler 31, the temperature change inside the subcooler 31 can be monitored in real time, and the temperature state of the refrigerant can be timely understood; the temperature sensor 362 provides accurate temperature data, which can be used to optimize the flow and heat exchange efficiency of the refrigerant, reduce energy loss, and thus improve the energy efficiency of the system; the addition of the temperature sensor 362 allows the system to operate more automatically, reduce manual intervention, and improve the convenience of operation; by real-time monitoring and controlling the temperature, the wear of the equipment caused by abnormal temperature can be reduced, and the service life of the equipment can be extended.

[0037] The pipeline assembly also includes a throttle valve 37, a throttle main pipe 353 and at least two throttle branches 354. Figure 1In one embodiment of the present invention, the pipeline assembly also includes a throttling main pipe 353 and two throttling branches 354, each throttling branch pipe 354 is respectively connected to a pipeline of a subcooler 31, and each second switch valve 302 is arranged on a throttling branch pipe 354; one end of each throttling branch pipe 354 away from the corresponding subcooler 31 is connected to the throttling main pipe 353, and one end of the throttling main pipe 353 away from each throttling branch pipe 354 is connected to the evaporator 4 pipeline; the throttling valve 37 is arranged on the throttling main pipe 353. By arranging a throttle 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, thereby improving the efficiency of flow control; the throttle valve 37 can also control the pressure of the refrigerant entering the evaporator 4, thereby reducing the pressure of the high-pressure liquid refrigerant and converting it into a low-temperature and low-pressure refrigerant liquid; at the same time, the throttle valve 37 can also control the superheat of the refrigerant at the outlet of the evaporator 4, thereby maintaining full utilization of the heat transfer area of ​​the evaporator 4 and preventing the suction of liquid from damaging the compressor 1; the design of the throttling branch pipe 354 and the throttling main pipe 353 allows the flow of each subcooler 31 to be independently adjusted, and the flow is accurately controlled by the throttle valve 37 to meet different refrigeration needs.

[0038] To prevent the valve 301 from causing compressor 1 failure due to insufficient refrigerant flow during the opening adjustment process of the two subcoolers 31 for alternating deep cooling and cooling release of the refrigerant. Figure 1 In one embodiment of the present invention, the refrigeration unit further includes a flow meter, which is arranged on the pipeline connecting the condenser 2 and the compressor 1 and is used to monitor the flow rate of the refrigerant flowing out of the compressor 1; the pipeline assembly also includes a throttling bypass 355 and a regulating valve 356, and the condenser 2 is connected to the throttling valve 37 through the throttling bypass 355 pipeline; the regulating valve 356 is arranged on the throttling bypass 355. This solution adjusts the operating frequency of the compressor 1 and the bypass opening degree of the regulating valve 356 according to the real-time flow monitoring at the compressor outlet position, so as to ensure that the refrigerant is at a certain flow level, thereby further ensuring the stable and reliable continuous operation of the system.

[0039] It is understandable that the chiller 33 can be a fixed chiller or a variable evaporating temperature chiller. In one embodiment of the present invention, the chiller 33 is a variable evaporating temperature chiller. By using a variable evaporating temperature chiller to cool the refrigerant, the average evaporating temperature of the chiller 33 can be increased, and the refrigeration efficiency of the chiller 33 of the external cold source can be improved, thereby improving the overall energy efficiency of the system.

[0040] The present invention also provides an air conditioner, which includes a housing and a refrigeration unit 1000. The specific structure of the refrigeration unit 1000 refers to the above embodiment. Since the air conditioner adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the refrigeration unit 1000 is arranged in the housing.

[0041] It should be noted that the application scope of the refrigeration unit 1000 includes but is not limited to air conditioning, central air conditioning, cold storage, etc.

[0042] The present invention also proposes a valve control method, including setting the subcooler 31 to initially stand and cool down 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 subcooler 31 flowing through the throttle 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 obtaining the value P of the pressure sensor 361; When one of the subcoolers is cooled down: compare T with T4, compare T with T1, compare T with T2, compare P with P1+P0+(P1+P0)*0.2, and compare P with (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, so that the liquid refrigerant produced by the condenser 2 enters the subcooler 31, increases the internal pressure, and is left 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, so that the refrigerant in the subcooler 31 is cooled down to T1 by changing the evaporation temperature of the refrigeration machine; When releasing the cold capacity: 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; at the same time, control the first switch valve 301 so that P>P1+P0, let it stand to complete the release of the refrigerant, the gaseous refrigerant flows to the compressor 1, and the liquid refrigerant flows to the evaporator 4. At the same time, close the valve of another subcooler 31 connecting the evaporator 4 and the compressor 1, and stop the release of the 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 pipeline connecting the subcooler 31 with the cold machine, the evaporator 4 and the compressor 1, and inject the refrigerant into the subcooler 31 from the condenser 2, prepare for standing, and at the same time open the valve of another subcooler 31 connecting the evaporator 4 and the compressor 1 to release the refrigerant in the other subcooler 31. In this way, the automatic opening and closing of each valve of the refrigeration unit 1000 can be completed according to parameters such as operating conditions, temperature and pressure, thereby realizing the automatic operation of the refrigeration unit 1000.

[0043] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A refrigeration unit (1000), comprising a compressor (1), a condenser (2), a subcooling component and an evaporator (4), wherein 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, wherein: The supercooling component comprises At least two subcoolers (31), each of the subcoolers (31) is connected to the condenser (2) pipeline, and a first switch valve (301) is provided on the pipeline between the condenser (2) and each of the subcoolers (31); each of the subcoolers (31) is connected to the evaporator (4) pipeline, and a second switch valve (302) is provided on the pipeline between the evaporator (4) and each of the subcoolers (31); each of the subcoolers (31) is connected to the compressor (1) pipeline, and a third switch valve (303) is provided on the pipeline between the compressor (1) and each of the subcoolers (31); at least two heat exchangers (32), each of the heat exchangers (32) being disposed in one of the subcoolers (31); and A cooling machine (33), wherein the cooling machine (33) is connected to each of the heat exchangers (32) through a pipeline, and a fourth switch valve (304) is provided on each of the pipelines between the cooling machine (33) and each of the heat exchangers (32).

2. The refrigeration unit (1000) according to claim 1, characterized in that: The subcooling component also includes a pressure control valve (34), which is arranged in a pipeline connecting each of the subcoolers (31) and the compressor (1) and is used to control the pressure of the refrigerant vapor from each subcooler (31) flowing to the compressor (1).

3. The refrigeration unit (1000) according to claim 2, characterized in that: The subcooling component also includes a pipeline component, which includes a pressure main pipe (351) and at least two pressure branches (352), each of the pressure branches (352) being connected to a pipeline of the subcooler (31), and each of the third switch valves (303) being arranged on a pressure branch pipe (352); an end of each of the pressure branches (352) away from the corresponding subcooler (31) is connected to the pressure main pipe (351) pipeline, and an end of the pressure main pipe (351) away from each of the pressure branches (352) is connected to the compressor (1) pipeline; and the pressure control valve (34) is arranged on the pressure main pipe (351).

4. The refrigeration unit (1000) according to claim 3, characterized in that: The subcooling component also includes a monitoring component, and the monitoring component also includes at least two pressure sensors (361). Each of the pressure sensors (361) is arranged in one of the subcoolers (31), and each of the pressure sensors (361) is used to monitor the pressure value inside each of the subcoolers (31).

5. The refrigeration unit (1000) according to claim 4, characterized in that: The monitoring component further comprises at least two temperature sensors (362), each of the temperature sensors (362) being arranged in one of the subcoolers (31), and each of the temperature sensors (362) being used to monitor the temperature value inside each of the subcoolers (31).

6. The refrigeration unit (1000) according to claim 3, characterized in that: The pipeline assembly also includes a throttle valve (37), a throttle main pipe (353) and at least two throttle branches (354), each of the throttle branches (354) is connected to a pipeline of the subcooler (31), and each of the second switch valves (302) is arranged on a throttle branch pipe (354); one end of each throttle branch pipe (354) away from the corresponding subcooler (31) is connected to the throttle main pipe (353) pipeline, and one end of the throttle main pipe (353) away from each throttle branch pipe (354) is connected to the evaporator (4) pipeline; the throttle valve (37) is arranged on the throttle main pipe (353).

7. The refrigeration unit (1000) according to claim 6, characterized in that: The refrigeration unit (1000) further comprises a flow meter (5), wherein the flow meter (5) is arranged on a pipeline connecting the condenser (2) and the compressor (1), and is used to monitor the flow rate of the refrigerant flowing out of the compressor (1); The pipeline assembly also includes a throttling bypass (355) and a regulating valve (356); the condenser (2) and the throttling valve (37) are connected via the throttling bypass (355) pipeline; the regulating valve (356) is arranged on the throttling bypass (355).

8. The refrigeration unit (1000) according to any one of claims 1 to 7, characterized in that: The cooling machine (33) is a variable evaporation temperature cooling machine (33).

9. An air conditioner, characterized in that: The air conditioner comprises a housing and a refrigeration unit (1000) according to any one of claims 1 to 8, wherein the refrigeration unit (1000) is arranged in the housing.

10. A valve control method, applied to the refrigeration unit (1000) as described in any one of 1 to 8, characterized in that: The valve control method comprises: The subcooler (31) is set to initially stand and cool to a temperature T4, and the outlet temperature T2 of the condenser (2) is obtained; Obtaining the temperature T1 of the refrigerant in the evaporator (4), obtaining the flow resistance P0 of the refrigerant in each of the subcoolers (31) flowing through the throttle 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 a value T of the temperature sensor (362), and obtaining a value P of the pressure sensor (361); When one of the subcoolers (31) is cooled: Compare T with T4, compare T with T1, compare T with T2, compare P with P1+P0+(P1+P0)*0.2, and compare P with (P1+P0); When T>T4 and P<P1+P+(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 produced by the condenser (2) enters the subcooler (31), increases the internal pressure, and is left to cool to T4°C; 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 in the subcooler (31) is cooled to T1 through the cooling machine (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 to make 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.

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