Economizer assembly control method and system

Abstract

The application discloses an economizer assembly control method and system, and the economizer assembly comprises a heat exchanger, a main path inlet pipeline, a main path outlet pipeline, an auxiliary path inlet pipeline, an auxiliary path outlet pipeline and a throttling device, the heat exchanger has two first flow channels and second flow channels which are independent of each other; the main path inlet pipeline is communicated with the main path outlet pipeline through the first flow channel, one end of the auxiliary path inlet pipeline is communicated with the main path inlet pipeline, and the other end of the auxiliary path inlet pipeline is communicated with the auxiliary path outlet pipeline through the throttling device and the second flow channel; the control method comprises the following steps: monitoring a first state parameter of the auxiliary path outlet pipeline, and selecting different regulation rates to regulate the opening degree of the throttling device based on the first state parameter. According to the economizer assembly control method, the first state parameter of the auxiliary path outlet pipeline is detected, the operation of the economizer assembly is regulated and controlled, the performance of the economizer assembly is ensured, and the safety and stability of the air conditioning system are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange of air conditioning system, and particularly relates to a control method and system of an economizer assembly. BACKGROUND

[0002] The economizer, also known as an economic pressure controller, is commonly used in air-cooled screw air conditioning units. The main body of the economizer is a heat exchanger. High-pressure liquid refrigerant flowing out of the condenser enters the economizer and is divided into two branches, a main branch and an auxiliary branch. The refrigerant in the auxiliary branch enters the throttling device in the economizer and is throttled and expanded to further cool the refrigerant in the main branch. The liquid refrigerant in the main branch is supercooled and then enters the evaporator through the expansion valve to complete the refrigeration of the air conditioning system. In the auxiliary branch, the part of the refrigerant used to supercool the main branch absorbs heat and becomes gaseous, and then reenters the compressor through the communication pipeline between the economizer and the compressor to continue compression and enter the next refrigeration cycle. The economizer effectively improves the heat exchange performance and efficiency of the air conditioning unit and has a positive effect on improving the refrigeration efficiency.

[0003] In existing air conditioning systems, the throttling device in the economizer is installed on the pipeline of the auxiliary branch. The opening of the throttling device affects the state of the refrigerant in the auxiliary branch, and the state of the refrigerant in the auxiliary branch in turn affects the operation of the throttling device, thereby affecting the overall performance of the economizer assembly. In addition, the outlet of the auxiliary branch is often connected to the compressor. The compressor compresses the gaseous refrigerant to increase its temperature and pressure. The refrigerant in the auxiliary branch absorbs heat from the main branch and becomes gaseous. In this process, if the heat absorption effect is not good, there will be liquid beads in the gaseous refrigerant flowing out of the auxiliary outlet pipeline, causing liquid impact on the compressor, thereby causing damage to the compressor, and the safety and stability of the air conditioning system cannot be guaranteed. SUMMARY

[0004] The purpose of the present application is to provide a control method and system of an economizer assembly that monitors the state parameters at the outlet pipeline of the auxiliary branch to ensure the performance of the economizer assembly and enhance the safety and stability of the air conditioning system.

[0005] To achieve the above-mentioned purpose, the present application provides a control method of an economizer assembly, which comprises a heat exchanger, a main inlet pipeline, a main outlet pipeline, an auxiliary inlet pipeline, an auxiliary outlet pipeline, and a throttling device. The heat exchanger has two first flow channels and second flow channels that are independent of each other. The main inlet pipeline communicates with the main outlet pipeline through the first flow channel. One end of the auxiliary inlet pipeline communicates with the main inlet pipeline, and the other end of the auxiliary inlet pipeline communicates with the auxiliary outlet pipeline through the throttling device and the second flow channel.

[0006] The control method comprises: monitoring a first state parameter of the auxiliary road outlet pipeline, and adjusting the opening degree of the throttling device at different adjustment rates based on the first state parameter.

[0007] Specifically, when monitoring the first state parameter, it is determined whether the first state parameter meets a first preset condition. If yes, a second state parameter between the main road inlet pipeline and the main road outlet pipeline is monitored, and the opening degree of the throttling device is adjusted at different adjustment rates based on the second state parameter. If no, it is determined whether the first state parameter meets a second preset condition. If yes, the opening degree of the throttling device is controlled to decrease based on a preset first adjustment rate. If no, the throttling device is closed.

[0008] Specifically, when monitoring the first state parameter, it is determined whether the first state parameter meets a first preset condition. If yes, a second state parameter between the main road inlet pipeline and the main road outlet pipeline is monitored, and the opening degree of the throttling device is adjusted at different adjustment rates based on the second state parameter. If no, it is determined whether the first state parameter meets a second preset condition. If yes, the opening degree of the throttling device is controlled to decrease based on a preset first adjustment rate. If no, the throttling device is closed.

[0009] Further, when the first state parameter meets the first preset condition, it is determined whether the second state parameter meets a third preset condition. If yes, the opening degree of the throttling device is controlled to be unchanged. If no, it is determined whether the second state parameter meets a fourth preset condition. If yes, the opening degree of the throttling device is controlled to decrease based on a preset second adjustment rate. If no, the opening degree of the throttling device is controlled to increase based on the second adjustment rate.

[0010] Further, when the first state parameter meets the first preset condition, the second state parameter does not meet the third preset condition and meets the fourth preset condition, it is determined whether the second state parameter meets a fifth preset condition. If yes, the opening degree of the throttling device is controlled to decrease based on a preset third adjustment rate. If no, the opening degree of the throttling device is controlled to decrease based on the second adjustment rate.

[0011] Further, when the first state parameter meets the first preset condition, the second state parameter does not meet the third preset condition and does not meet the fourth preset condition, it is determined whether the second state parameter meets a sixth preset condition. If yes, the opening degree of the throttling device is controlled to increase based on the third adjustment rate. If no, the opening degree of the throttling device is controlled to increase based on the second adjustment rate.

[0012] Further, when the first state parameter meets the first preset condition, the second state parameter does not meet the third preset condition and does not meet the fourth preset condition, it is determined whether the second state parameter meets a sixth preset condition. If yes, the opening degree of the throttling device is controlled to increase based on the third adjustment rate. If no, the opening degree of the throttling device is controlled to increase based on the second adjustment rate.

[0013] Further, the first state parameter comprises a superheat degree of the auxiliary road outlet pipeline, and the second state parameter comprises a subcooling degree between the main road inlet pipeline and the main road outlet pipeline.

[0014] The first preset condition is that the first state parameter is greater than a preset first threshold.

[0015] The second preset condition is that the first state parameter is greater than or equal to a preset second threshold value.

[0016] The third preset condition is that the second state parameter is greater than or equal to a preset third threshold value and less than or equal to a preset fourth threshold value.

[0017] The fourth preset condition is that the second state parameter is greater than the fourth threshold value.

[0018] The fifth preset condition is that the second state parameter is greater than or equal to a preset fifth threshold value.

[0019] The sixth preset condition is that the second state parameter is less than or equal to a preset sixth threshold value.

[0020] The first threshold value is greater than the second threshold value, the third threshold value is less than the fourth threshold value, the fifth threshold value is greater than the fourth threshold value, and the sixth threshold value is less than the third threshold value.

[0021] Further, the throttling device comprises a plurality of electronic expansion valves arranged in parallel, each of the electronic expansion valves is independent of each other, and the opening degree of each of the electronic expansion valves is adjusted in a preset adjustment sequence.

[0022] The application further discloses an air conditioning system, which comprises a control system and an economizer assembly, and the control system controls the operation of the economizer assembly based on the control method.

[0023] The application further discloses a control system of an economizer assembly, which comprises:

[0024] one or more processors;

[0025] a memory;

[0026] and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the programs comprise instructions for executing the control method.

[0027] The application further discloses a computer readable storage medium, which comprises a computer program that can be executed by a processor to complete the control method.

[0028] Compared with the prior art, the control method in the application estimates the working state of the current throttling device by monitoring the first state parameter of the auxiliary road outlet pipeline, and then adjusts the opening degree of the throttling device based on the first state parameter. This adjustment method based on the actual operating state is more accurate and flexible than the traditional fixed adjustment and manual adjustment, reduces the risk of failure, and better meets the performance requirements of the economizer assembly operation, thereby promoting the safety and stability of the air conditioning system.

[0029] In addition, in the application, the auxiliary road inlet pipeline takes liquid from the main road inlet pipeline, and the refrigerant flowing through the main road inlet pipeline is throttled and expanded by the throttling device to supercool the refrigerant flowing into the heat exchanger from the main road inlet pipeline. By changing the liquid taking position of the auxiliary road inlet pipeline, the performance and reliability of the economizer can be improved without changing the existing combination structure and working mode of the economizer, and the safety and stability of the air conditioning system are enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The figure is a schematic structural diagram of the economizer assembly in the embodiment of the application.

[0031] Figure 2 The figure is a schematic structural diagram of the air conditioning system in the embodiment of the application.

[0032] Figure 3 The figure is a flow chart of the control method of the economizer assembly in the embodiment of the application.

[0033] Figure 4 The figure is a flow chart of the control method of the economizer assembly in another embodiment of the application.

[0034] Figure 5 The figure is a flow chart of the control method of the economizer assembly when the first state parameter meets the first preset condition in the embodiment of the application.

[0035] Figure 6 The figure is a flow chart of the control method of the economizer assembly when the first state parameter meets the first preset condition and the second state parameter does not meet the third preset condition in the embodiment of the application. DETAILED DESCRIPTION

[0036] To explain the technical content, structural features, achieved purposes and effects of the application in detail, the following will be described in detail in combination with the embodiments and the accompanying drawings.

[0037] The embodiment discloses an economizer assembly 1 for an air conditioning system to weaken the negative effects of feedback circulation and thereby enhance the stability of the air conditioning system. Referring to Figure 1As shown, the economizer assembly 1 in the embodiment includes a heat exchanger 11, a main path inlet pipeline 121, a main path outlet pipeline 122, an auxiliary path inlet pipeline 131, an auxiliary path outlet pipeline 132, and a throttling device 14. The heat exchanger 11 has two first and second flow channels 11a and 11b independent of each other. The heat exchanger 11 is provided with a first liquid inlet 111, a liquid outlet 112, a second liquid inlet 113, and a gas outlet 114. The first liquid inlet 111 and the liquid outlet 112 are respectively located at two ends of the first flow channel 11a. The second liquid inlet 113 and the gas outlet 114 are respectively located at two ends of the second flow channel 11b.

[0038] It should be noted that the first and second flow channels 11a and 11b provide heat exchange effects for the flowing refrigerant. The refrigerant in the second flow channel 11b also exchanges heat with the refrigerant in the first flow channel 11a to absorb the heat of the refrigerant in the first flow channel 11a, so that the temperature of the refrigerant in the first flow channel 11a is lower and the desired supercooling effect is achieved.

[0039] The main path inlet pipeline 121 and the main path outlet pipeline 122 are respectively connected to the first liquid inlet 111 and the liquid outlet 112 of the heat exchanger 11. One end of the auxiliary path inlet pipeline 131 is in communication with the main path inlet pipeline 121, and the other end of the auxiliary path inlet pipeline 131 is connected to the second liquid inlet 113 of the heat exchanger 11 through the throttling device 14. The throttling device 14 is used to depressurize the refrigerant flowing into the auxiliary path inlet pipeline 131. The auxiliary path outlet pipeline 132 is connected to the gas outlet 114 of the heat exchanger 11.

[0040] In the normal operation state of the economizer assembly 1, the refrigerant to be supercooled enters the first flow channel 11a of the heat exchanger 11 through the main path inlet pipeline 121. The refrigerant in the first flow channel 11a is supercooled by heat exchange and then outputted from the liquid outlet 112 to the outside through the main path outlet pipeline 122. Part of the refrigerant input from the main path inlet pipeline 121 is branched off and flows into the second flow channel 11b through the auxiliary path inlet pipeline 131 to be used to supercool the refrigerant in the first flow channel 11a. This part of the refrigerant is throttled and expanded by the throttling device 14 arranged on the auxiliary path inlet pipeline 131, so that the pressure is reduced and the temperature is lowered. This part of the refrigerant evaporates in the heat exchanger 11 to absorb heat, thereby forming gaseous refrigerant, which enters the next stage to be cooled into liquid refrigerant along the auxiliary path outlet pipeline 132. In this process, the flow path of the refrigerant is a, b, c, d, and e. The refrigerant flows between the main path inlet pipeline 121 and the main path outlet pipeline 122 to form a main path branch flow. The refrigerant flows between the auxiliary path inlet pipeline 131 and the auxiliary path outlet pipeline 132 to form an auxiliary path branch flow.

[0041] In the process, compared with the prior art, the auxiliary road inlet pipeline 131 is replaced from taking liquid by the main road outlet pipeline 122 to taking liquid by the main road inlet pipeline 121, avoiding affecting the supercooling degree of the main road outlet pipeline 122 due to the fact that the liquid taking position is close to the throttling device 14, thereby in turn affecting the opening of the throttling device 14 itself. The change of the liquid taking position can weaken the negative effect of the feedback cycle between the throttling device 14 and the supercooling degree of the main road outlet pipeline 122 as much as possible without changing the existing combination structure and working mode of the economizer assembly 1, improve the performance and reliability of the economizer assembly 1, and further enhance the operation stability of the air conditioning system in which the economizer assembly 1 is located.

[0042] The application also provides a control method of the economizer assembly 1, which adjusts the opening of the throttling device 14 in the economizer assembly 1 according to the state parameter of the refrigerant flowing in the economizer assembly 1, as shown in Figure 3 The control method comprises the following steps:

[0043] S1: monitoring a first state parameter of the auxiliary road outlet pipeline 132.

[0044] S2: adjusting the opening of the throttling device 14 based on the first state parameter and selecting different adjustment rates, and jumping to step S1.

[0045] In the operation process of the economizer assembly 1, the state of the throttling device 14, i.e., the opening of the throttling device 14, can be adjusted and controlled based on the first state parameter. The first state parameter includes the superheat degree of the auxiliary road outlet pipeline 132.

[0046] Further, when monitoring the first state parameter, as shown in Figure 4 The control method further comprises the following steps:

[0047] S21: judging whether the first state parameter meets a first preset condition, if yes, jumping to step S3, and if no, jumping to step S22.

[0048] S22: judging whether the first state parameter meets a second preset condition, if yes, jumping to step S23, and if no, jumping to step S24.

[0049] S23: controlling the opening of the throttling device 14 to decrease based on a preset first adjustment rate, and jumping to step S1.

[0050] S24: closing the throttling device 14, and jumping to step S1.

[0051] S3: monitoring a second state parameter between the main road inlet pipeline 121 and the main road outlet pipeline 122, adjusting the opening of the throttling device 14 based on the second state parameter and selecting different adjustment rates, and jumping to step S1.

[0052] Specifically, the first preset condition is that the first state parameter is greater than a preset first threshold, and a preferred value of the first threshold is 10℃.

[0053] The second preset condition is that the first state parameter is greater than or equal to a preset second threshold, the second threshold is less than the first threshold, and a preferred value of the second threshold is 3℃; and a preferred value of the first adjustment rate is 3 steps / 2s.

[0054] On the other hand, when the first state parameter meets the first preset condition, referring to Figure 5 As shown in the figure, the control method of the economizer assembly 1 further includes:

[0055] S31: determining whether the second state parameter meets a third preset condition, if yes, jumping to step S32, and if no, jumping to step S4.

[0056] S32: controlling the opening degree of the throttling device 14 to be unchanged, and jumping to step S1.

[0057] S4: determining whether the second state parameter meets a fourth preset condition, if yes, jumping to step S5, and if no, jumping to step S6.

[0058] S5: controlling the opening degree of the throttling device 14 to decrease based on a preset second adjustment rate, and jumping to step S1.

[0059] S6: controlling the opening degree of the throttling device 14 to increase based on the second adjustment rate, and jumping to step S1. A preferred value of the second adjustment rate is 3 steps / 10s.

[0060] Specifically, the second state parameter includes a supercooling degree between the main path inlet pipeline 121 and the main path outlet pipeline 122.

[0061] The third preset condition is that the second state parameter is greater than or equal to a preset third threshold and less than or equal to a preset fourth threshold.

[0062] The fourth preset condition is that the second state parameter is greater than the fourth threshold; and the third threshold is less than the fourth threshold.

[0063] Further, a target supercooling degree T representing the supercooling degree between the main path inlet pipeline 121 and the main path outlet pipeline 122 is further included, and the performance of the economizer assembly 1 reaches the best at the target supercooling degree T. A preferred value of the third threshold is T-1℃, and a preferred value of the fourth threshold is T+1℃. It should be noted that the target supercooling degree T is affected by different types of economizers and pipeline materials, and is not the same. Those skilled in the art can freely select and set according to the use scene and conditions during use, and the present application does not make specific limitations here.

[0064] On the other hand, when the first state parameter satisfies the first preset condition, the second state parameter does not satisfy the third preset condition and satisfies the fourth preset condition, referring to Figure 6 As shown in the figure, the control method of the economizer assembly 1 further comprises:

[0065] S51: judge whether the second state parameter satisfies the fifth preset condition, if yes, jump to step S52, if not, jump to step S53.

[0066] S52: control the opening of the throttling device 14 to decrease based on the third preset adjustment rate, and jump to step S1.

[0067] S53: control the opening of the throttling device 14 to decrease based on the second adjustment rate, and jump to step S1.

[0068] Specifically, the fifth preset condition is that the second state parameter is greater than or equal to a fifth threshold value, the fifth threshold value is greater than the fourth threshold value, and the preferred value of the fifth threshold value is T+3℃; the preferred value of the third adjustment rate is 3 steps / 5s.

[0069] On the other hand, when the first state parameter satisfies the first preset condition, the second state parameter does not satisfy the third preset condition and does not satisfy the fourth preset condition, referring to Figure 6 As shown in the figure, the control method of the economizer assembly 1 further comprises:

[0070] S61: judge whether the second state parameter satisfies the sixth preset condition, if yes, jump to step S62, if not, jump to step S63.

[0071] S62: control the opening of the throttling device 14 to increase based on the third adjustment rate, and jump to step S1.

[0072] S63: control the opening of the throttling device 14 to increase based on the second adjustment rate, and jump to step S1.

[0073] Specifically, the sixth preset condition is that the second state parameter is less than or equal to a preset sixth threshold value, the sixth threshold value is less than the third threshold value, and the preferred value of the sixth threshold value is T-3℃.

[0074] In the existing control scheme of the economizer, the opening of the throttling device 14 is usually controlled based on the superheat degree of the refrigerant at the auxiliary road outlet pipeline 132 or the subcooling degree between the main road inlet pipeline 121 and the main road outlet pipeline 122. The control reference factor is relatively single, which is not conducive to precise control of the economizer assembly 1. Moreover, the control of the subcooling degree between the main road inlet pipeline 121 and the main road outlet pipeline 122 can only ensure the performance of the economizer assembly 1, but cannot ensure the superheat degree of the auxiliary road outlet pipeline 132. When the superheat degree of the auxiliary road outlet pipeline 132 is low, the gasification degree of the refrigerant in the auxiliary road branch flow does not reach the expectation, the gasification degree of the refrigerant is poor, and the gaseous refrigerant output by the auxiliary road outlet pipeline 132 carries refrigerant liquid beads. These refrigerant liquid beads are output through the auxiliary road outlet pipeline 132, which may cause damage to the equipment connected with the auxiliary road outlet pipeline 132. Monitoring the superheat degree of the auxiliary road outlet pipeline 132 can avoid this situation and further ensure the safety of the air conditioning system.

[0075] Compared with the existing control scheme, the control method disclosed in the embodiment controls the opening of the throttling device 14 in the economizer assembly 1 based on the superheat degree (first state parameter) of the auxiliary road outlet pipeline 132 and the subcooling degree (second state parameter) between the main road inlet pipeline 121 and the main road outlet pipeline 122. The performance of the economizer assembly 1 is ensured, and the protection of the connected equipment is realized.

[0076] Referring back to FIG. 1, Figure 1 In some embodiments, the first temperature sensor 151 is arranged on the main road inlet pipeline 121 to detect the temperature of the refrigerant in the main road inlet pipeline 121, the second temperature sensor 152 is arranged on the main road outlet pipeline 122 to detect the temperature of the refrigerant in the main road outlet pipeline 122, and the third temperature sensor is arranged on the auxiliary road outlet pipeline 132 to detect the temperature of the refrigerant in the auxiliary road outlet pipeline 132, and the pressure sensor 16 is arranged on the auxiliary road outlet pipeline 132 to detect the gas pressure of the refrigerant in the auxiliary road outlet pipeline 132.

[0077] The calculation method of the superheat degree (first state parameter) of the auxiliary road outlet pipeline 132 includes: obtaining the corresponding third temperature value and pressure value of the third temperature sensor 153 and the pressure sensor 16; obtaining the saturation temperature of the refrigerant corresponding to the pressure value based on the pressure value through a saturation temperature conversion method; and calculating the difference between the third temperature value and the saturation temperature, so as to obtain the superheat degree (first state parameter) of the auxiliary road outlet pipeline 132. It should be noted that, in the embodiment, the saturation temperature conversion method includes any one of the refrigerant thermodynamic property table, the pressure-temperature diagram, and the saturation temperature calculation formula. Common saturation temperature calculation formulas include the Antoine equation, the state equation, etc. Through the saturation temperature calculation formula, the saturation temperature of the refrigerant corresponding to the pressure value can be calculated according to the specific type of the refrigerant, which will not be described here.

[0078] The calculation method of the supercooling degree (the second state parameter) between the main path inlet pipeline 121 and the main path outlet pipeline 122 includes: obtaining the first temperature value and the second temperature value corresponding to the first temperature sensor 151 and the second temperature sensor 152; and calculating the difference between the first temperature value and the second temperature value, so as to obtain the second state parameter.

[0079] The superheat degree (the first state parameter) of the auxiliary path outlet pipeline 132 and the supercooling degree (the second state parameter) between the main path inlet pipeline 121 and the main path outlet pipeline 122 can be obtained through the first temperature sensor 151 arranged on the main path inlet pipeline 121, the second temperature sensor arranged on the main path outlet pipeline 122, and the third temperature sensor 153 and the pressure sensing device arranged on the auxiliary path inlet pipeline. Based on the supercooling degree (the second state parameter) between the main path inlet pipeline 121 and the main path outlet pipeline 122 and the superheat degree (the first state parameter) of the auxiliary path outlet pipeline 132, the opening of the throttling device 14 can be adjusted and set.

[0080] In some embodiments, the throttling device 14 includes a plurality of electronic expansion valves arranged in parallel. In this embodiment, taking three electronic expansion valves as an example, the throttling device 14 of the economizer assembly 1 includes a first electronic expansion valve 141, a second electronic expansion valve 142, and a third electronic expansion valve 143. Compared with the design of combining a thermal expansion valve and an electronic valve commonly used in the prior art, the electronic expansion valve used in the present application has significant advantages in reaction sensitivity and action speed, adjustment accuracy, and stability. More importantly, the thermal expansion valve is self-adjusted in a thermal manner, while the electronic expansion valve is adjusted in an electronic manner and can receive instructions from the control system of the air conditioning system to perform switching actions. The electronic expansion valve can generate adjustment actions according to more state parameters of the air conditioning system in addition to the state parameters of the refrigerant, thereby realizing more extensive control functions.

[0081] On the other hand, in the control method of the economizer assembly 1, the openings of the electronic expansion valves are adjusted in a preset adjustment sequence.

[0082] When the opening of the throttling device 14 is controlled to increase, the opening of the first electronic expansion valve 141 is first controlled to increase until the first electronic expansion valve 141 is fully open. Then, the opening of the second electronic expansion valve 142 is controlled to increase until the second electronic expansion valve 142 is fully open. Finally, the opening of the third electronic expansion valve 143 is controlled to increase until the third electronic expansion valve 143 is fully open.

[0083] When the opening degree of the throttling device 14 is controlled to decrease, the opening degree of the third electronic expansion valve 143 is controlled to decrease first until the third electronic expansion valve 143 is closed, then the opening degree of the second electronic expansion valve 142 is controlled to decrease until the second electronic expansion valve 142 is closed, and finally the opening degree of the first electronic expansion valve 141 is controlled to decrease until the first electronic expansion valve 141 is closed.

[0084] When the throttling device 14 is controlled to close, the third electronic expansion valve 143 is closed first, then the second electronic expansion valve 142 is closed, and finally the first electronic expansion valve 141 is closed.

[0085] In some embodiments, the heat exchanger 11 is a plate heat exchanger. It is worth noting that the specific structure of the heat exchanger 11 belongs to the conventional technology in the art, which will not be described here.

[0086] Please refer to Figure 2 As shown in the figure, the application further discloses an air conditioning system, which comprises an expansion valve 2, an evaporator 3, a compressor 4, a condenser 5 and the economizer assembly 1 as above. The condenser 5 is connected with the economizer assembly 1 through a main path inlet pipeline 121, the economizer assembly 1 is connected with the expansion valve 2 through a main path outlet pipeline 122, the expansion valve 2 is connected with the evaporator 3, and the economizer assembly 1 is connected with the compressor 4 through an auxiliary path outlet pipeline 132.

[0087] The operation process of the air conditioning system in the embodiment of the application will be briefly introduced below, so as to facilitate the understanding of the application, which should not be regarded as a limitation to the application.

[0088] Firstly, the compressor 4 sucks in low-temperature and low-pressure gaseous refrigerant and compresses it into high-temperature and high-pressure gaseous refrigerant, and the high-temperature and high-pressure gaseous refrigerant is delivered to the condenser 5 and cooled and condensed into liquid refrigerant by the condenser 5;

[0089] Then, the liquid refrigerant is delivered to the economizer assembly 1 and input into the heat exchanger 11 in the economizer assembly 1 through the main path inlet pipeline 121. At the main path inlet pipeline 121 of the heat exchanger 11, part of the liquid refrigerant is divided into a main path branch stream and input into the first flow channel 11a of the heat exchanger 11 through the first liquid inlet 111, and the other part is divided into an auxiliary path branch stream and input into the second flow channel 11b of the heat exchanger 11 from the second liquid inlet 113 along the auxiliary path inlet pipeline 131, and the refrigerant in the second flow channel 11b is used to supercool the liquid refrigerant in the first flow channel 11a. After supercooling, the refrigerant in the first flow channel 11a flows out from the liquid outlet 112 along the main path outlet pipeline 122 to the expansion valve 2, and the refrigerant in the second flow channel 11b absorbs heat and becomes gaseous refrigerant and is discharged from the gas outlet 114 along the auxiliary path outlet pipeline 132 to the compressor 4 to perform the next refrigeration cycle.

[0090] Then, the liquid refrigerant flowing to the expansion valve 2 is depressurized by the expansion valve 2, and is delivered from the expansion valve 2 to the evaporator 3 to be evaporated, and the low-temperature and low-pressure liquid refrigerant absorbs heat to achieve cooling of the air.

[0091] Finally, the refrigerant evaporated by the evaporator 3 is input into the compressor 4, and is compressed together with the gaseous refrigerant discharged from the auxiliary outlet pipeline 132 to form a new refrigeration cycle, thereby achieving recycling of the refrigerant.

[0092] In another preferred embodiment of the present application, an air conditioning system is disclosed, which comprises a control system and the economizer assembly 1 as described above, and the control system controls the economizer assembly 1 to work based on the control method as described above.

[0093] The present application also discloses a control system of the economizer assembly 1, which comprises one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the programs comprise instructions for executing the control method as described above. The processor can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, for executing related programs to execute the control method of the method embodiments of the present application.

[0094] The present application also discloses a computer-readable storage medium comprising a computer program, which can be executed by a processor to complete the control method as described above. The computer-readable storage medium can be any available medium accessible by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available medium can be a read-only memory (ROM), or a random access memory (RAM), or a magnetic medium such as a floppy disk, a hard disk, a magnetic tape, a magnetic disc, or an optical medium such as a digital versatile disc (DVD), or a semiconductor medium such as a solid state disk (SSD), etc.

[0095] The embodiments of the present application also disclose a computer program product or a computer program, which comprises computer instructions stored in a computer-readable storage medium. The processor of an electronic device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to make the electronic device execute the control method described above.

[0096] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The presently disclosed embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No limitation is intended to the scope of the claims with respect to any embodiment illustrated in the drawings or described herein.

[0097] The above disclosure is presented as preferred embodiments of the present application. It is not intended to be limited to the details of the embodiments described, since the spirit or scope of the application is encompassed by the appended claims.

Claims

1. A method of controlling an economizer assembly, comprising: The economizer assembly comprises a heat exchanger, a main path inlet pipeline, a main path outlet pipeline, an auxiliary path inlet pipeline, an auxiliary path outlet pipeline and a throttling device, the heat exchanger has two first flow channels and second flow channels independent of each other; The main path inlet pipeline is communicated with the main path outlet pipeline through the first flow channels, one end of the auxiliary path inlet pipeline is communicated with the main path inlet pipeline, and the other end of the auxiliary path inlet pipeline is communicated with the auxiliary path outlet pipeline through the throttling device and the second flow channels; The control method comprises the following steps: monitoring a first state parameter of the auxiliary path outlet pipeline, judging whether the first state parameter meets a first preset condition, if yes, monitoring a second state parameter between the main path inlet pipeline and the main path outlet pipeline, and adjusting the opening degree of the throttling device at different adjustment rates based on the second state parameter, if no, then: judging whether the first state parameter meets a second preset condition, if yes, controlling the opening degree of the throttling device to decrease based on a preset first adjustment rate, if no, closing the throttling device; The first state parameter comprises the superheat degree of the auxiliary path outlet pipeline, and the second state parameter comprises the subcooling degree between the main path inlet pipeline and the main path outlet pipeline; The first preset condition is that the first state parameter is greater than a preset first threshold value; The second preset condition is that the first state parameter is greater than or equal to a preset second threshold value; The first threshold value is greater than the second threshold value.

2. The control method of an economizer assembly according to claim 1, wherein, When the first state parameter meets the first preset condition, judging whether the second state parameter meets a third preset condition, if yes, controlling the opening degree of the throttling device to be unchanged, if no, then: judging whether the second state parameter meets a fourth preset condition, if yes, controlling the opening degree of the throttling device to decrease based on a preset second adjustment rate, if no, controlling the opening degree of the throttling device to increase based on the second adjustment rate; The third preset condition is that the second state parameter is greater than or equal to a preset third threshold value and less than or equal to a preset fourth threshold value; The fourth preset condition is that the second state parameter is greater than the fourth threshold value; The third threshold value is less than the fourth threshold value.

3. The control method of an economizer assembly according to claim 2, wherein, When the first state parameter meets the first preset condition, the second state parameter does not meet the third preset condition and meets the fourth preset condition, judging whether the second state parameter meets a fifth preset condition, if yes, controlling the opening degree of the throttling device to decrease based on a preset third adjustment rate, if no, controlling the opening degree of the throttling device to decrease based on the second adjustment rate; The fourth preset condition is that the second state parameter is greater than the fourth threshold value; The fifth preset condition is that the second state parameter is greater than or equal to a preset fifth threshold value; The fifth threshold value is greater than the fourth threshold value.

4. The control method of an economizer assembly according to claim 3, wherein When the first state parameter meets the first preset condition, the second state parameter does not meet the third preset condition and does not meet the fourth preset condition, it is judged whether the second state parameter meets a sixth preset condition, if yes, the opening of the throttling device is increased based on the third adjustment rate, if not, the opening of the throttling device is increased based on the second adjustment rate. The sixth preset condition is that the second state parameter is less than or equal to a preset sixth threshold value, and the sixth threshold value is less than the third threshold value.

5. The control method of an economizer assembly according to claim 1, wherein, The throttling device comprises a plurality of electronic expansion valves arranged in parallel, each of the electronic expansion valves is independent of each other, and the opening of each of the electronic expansion valves is adjusted in a preset adjustment sequence.

6. An air conditioning system characterized by comprising: The air conditioning system comprises a control system and an economizer assembly, and the control system controls the operation of the economizer assembly based on the control method of any one of claims 1 to 5.

7. A control system for an economizer assembly, comprising: Comprise: One or more processors; Memory; And one or more programs, wherein one or more programs are stored in the memory and are configured to be executed by the one or more processors, the program comprises instructions for executing the control method as claimed in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer program is executed by the processor to complete the control method as claimed in any one of claims 1 to 5. The computer program is executed by the processor to complete the control method as claimed in any one of claims 1 to 5.

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