CN113945020B

CN113945020B - Control method for centrifugal refrigeration equipment, device and medium

Info

Publication number: CN113945020B
Application number: CN202111216197.9A
Authority: CN
Inventors: 邓善营; 张捷; 王书森; 毛守博; 顾超; 陶祥先
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2023-03-31
Anticipated expiration: 2041-10-19
Also published as: CN113945020A

Abstract

The application relates to the technical field of refrigeration equipment, and discloses a control method for centrifugal refrigeration equipment, centrifugal refrigeration equipment includes the phase change pipeline, phase change pipeline one end and evaporimeter intercommunication, the other end and the port intercommunication of breathing in of the pipeline of breathing in of compressor are used for right the liquid refrigerant that the evaporimeter provided carries out heat transfer and handles and form gaseous refrigerant, the method includes: obtaining a surge condition of the compressor; and adjusting the refrigerant flow of the phase change pipeline according to the surge state so as to improve the suction pressure of the suction port. The method can effectively improve the suction pressure and improve the efficiency of surge control. The application also discloses a control device for the centrifugal refrigeration equipment, the refrigeration equipment and a medium.

Description

Control method for centrifugal refrigeration equipment, device and medium

Technical Field

The present invention relates to the technical field of refrigeration equipment, and for example, to a control method for centrifugal refrigeration equipment, a device, and a medium.

Background

Currently, centrifuges are equipped with gas suspension compressors or gas-liquid mixing compressors. Surge is present during both of the aforementioned types of compressor operating phases. Taking the air suspension compressor as an example, the air suspension compressor is configured with a bearing and an impeller. Because the airflow flows in the impeller in a reverse pressure gradient manner, when the flow is reduced or the pressure ratio is overlarge, the flow velocity of the gas in the gas suspension compressor is reduced, and meanwhile, the flow field is deteriorated, so that backflow is caused, and periodic shaking impact between a shaft and a bearing, commonly called surging, occurs. Because when the compressor takes place the surge, the periodic recoil of air current all has the damage to bearing and impeller, so, need urgent need to the control scheme of preventing the surge to centrifuge design.

The existing compressor adopts a way of preventing surging, namely a pressure bypass pipeline is arranged between a suction pipeline and a discharge pipeline of the compressor and used for adjusting the suction pressure of the compressor through the discharge pressure of the compressor, so that part of high-pressure discharge gas returns to the suction side to increase the suction pressure. Meanwhile, a control valve is arranged on the pressure bypass pipeline and used for controlling the gas force in the pressure bypass pipeline and controlling the compensation of the suction pressure.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

the refrigerant at the exhaust side of the compressor is a high-pressure high-temperature refrigerant, the refrigerant at the suction side is a low-pressure low-temperature refrigerant, and if the refrigerant at the exhaust side is directly input to the suction side, the refrigerant input to the suction side is overheated, so that the suction pressure cannot be effectively increased, and the efficiency of surge prevention control is influenced.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a control method for a centrifugal refrigeration device, a device and a medium, so as to improve the efficiency of surge control.

In some embodiments, the centrifugal refrigeration apparatus includes a phase-change pipeline, one end of the phase-change pipeline is communicated with an evaporator, and the other end of the phase-change pipeline is communicated with a suction port of a suction pipeline of a compressor, so as to perform a heat exchange process on a liquid refrigerant provided by the evaporator to form a gaseous refrigerant, and the method includes: obtaining a surge condition of the compressor; and adjusting the refrigerant flow of the phase change pipeline according to the surge state so as to improve the suction pressure of the suction port.

In some embodiments, the refrigeration appliance comprises: a compressor provided with a suction line; an evaporator in communication with the suction line; one end of the phase change pipeline is communicated with the evaporator, and the other end of the phase change pipeline is communicated with a gas suction port of a gas suction pipeline of the compressor and used for carrying out heat exchange treatment on the liquid refrigerant provided by the evaporator to form a gaseous refrigerant; and the controller is used for obtaining the surge state of the compressor and adjusting the refrigerant flow of the phase change pipeline according to the surge state so as to improve the suction pressure of the suction port.

In some embodiments, the apparatus comprises a processor and a memory storing program instructions, the processor being configured to execute the control method for a centrifugal refrigeration device as described above when executing the program instructions.

In some embodiments, the refrigeration device comprises a control device for a centrifugal refrigeration device as described above.

In some embodiments, the storage medium stores program instructions that, when executed, perform a control method for a centrifugal refrigeration appliance as previously described.

The control method, the refrigeration equipment, the device and the medium for the centrifugal refrigeration equipment provided by the embodiment of the disclosure can realize the following technical effects:

the centrifugal refrigeration equipment learns whether the compressor has surging or is about to surge according to the surging state, and adjusts the flow of the refrigerant of the phase change pipeline according to the surging condition. The method can adjust the amount of the refrigerant input to the air suction port of the air suction pipeline through the phase change pipeline, low-temperature and low-pressure liquid refrigerant forms low-temperature gaseous refrigerant after heat exchange treatment of the phase change pipeline, the gaseous refrigerant is input to the air suction port, the air suction pressure of the air suction port is improved, the problem that the refrigerant entering the air suction port is overheated is avoided, the air suction pressure is effectively improved, the compressor is enabled to be out of surge or the compressor is prevented from surging, and the efficiency of surge control is improved.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

FIG. 1 is a system schematic of a centrifugal refrigeration apparatus;

FIG. 2 is a system partial schematic of a centrifugal refrigeration apparatus;

FIG. 3 is a schematic diagram of a control method for a centrifugal chiller according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of another control method for a centrifugal chiller provided by an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of another control method for a centrifugal chiller provided by an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of another control method for a centrifugal chiller apparatus provided by embodiments of the present disclosure;

FIG. 7 is a schematic diagram of another control method for a centrifugal chiller provided by an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a control device for a centrifugal chiller according to an embodiment of the present disclosure;

fig. 9 is a schematic diagram of another control device for a centrifugal refrigeration apparatus provided by an embodiment of the disclosure.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The term "plurality" means two or more unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. E.g., a and/or B, represents: a or B, or A and B.

The term "correspond" may refer to an association or binding relationship, and a corresponding to B refers to an association or binding relationship between a and B.

Fig. 1 shows a system diagram of a centrifugal refrigeration apparatus. Fig. 2 shows a system partial schematic of a centrifugal refrigeration apparatus. The flow direction of the arrows in fig. 2 indicates the refrigerant transport direction.

Referring to fig. 1 and 2, the centrifugal refrigerating apparatus includes a compressor 10, an evaporator 20, a condenser 30, an air supply system, a phase change line 40, and a bypass line 50. The evaporator 20 communicates with a suction port 101a of a suction line 101 of the compressor 10. The condenser 30 communicates at one end with the discharge line 102 of the compressor 10 and at the other end with the evaporator 20 through the economizer 80. The air supply system includes an air supply tank 60 and an electric heater 70. The air supply tank 60 has one end communicating with the condenser 30 and the other end communicating with the compressor 10. The supply tank 60 is used to supply liquid refrigerant/vapor-liquid two-phase refrigerant to the compressor 10. The electric heater 70 heats the refrigerant in the air supply tank 60 to form a liquid refrigerant/vapor-liquid two-phase refrigerant. The bypass line 50 has one end communicating with the air supply tank 60 and the other end communicating with the suction port 101a of the suction line 101. The bypass line 50 is provided with a control valve 50a. One end of the phase change line 40 is communicated with the evaporator 20, and the other end is communicated with a suction port 101a of a suction line 101 of the compressor 10, so as to perform heat exchange treatment on the liquid refrigerant provided by the evaporator 20 to form a gaseous refrigerant. Wherein the compressor 10 is provided with an inverter.

For the centrifugal refrigeration equipment, the main reasons of the surge phenomenon caused by the operation stage of the compressor are high pressure difference and low refrigerant flow, so that the pressure difference can be reduced by increasing the suction pressure at the suction port, and the surge is prevented fundamentally.

Based on the foregoing centrifugal refrigeration apparatus and based on the foregoing principle, as shown in fig. 3, an embodiment of the present disclosure provides a control method for a centrifugal refrigeration apparatus, including:

and S01, the centrifugal refrigeration equipment obtains the surge state of the compressor.

And S02, the centrifugal refrigeration equipment adjusts the refrigerant flow of the phase change pipeline according to the surge state so as to improve the suction pressure of the suction port.

According to the control method for the centrifugal refrigeration equipment, the centrifugal refrigeration equipment knows whether the compressor has surging or is about to surge according to the surging state, and adjusts the refrigerant flow of the phase change pipeline according to the surging condition. The method can adjust the amount of the refrigerant input to the air suction port of the air suction pipeline through the phase change pipeline, low-temperature and low-pressure liquid refrigerant forms low-temperature gaseous refrigerant after heat exchange treatment of the phase change pipeline, the gaseous refrigerant is input to the air suction port, the air suction pressure of the air suction port is improved, the problem that the refrigerant entering the air suction port is overheated is avoided, the air suction pressure is effectively improved, the compressor is enabled to be out of surge or the compressor is prevented from surging, and the efficiency of surge control is improved.

Optionally, as shown in fig. 2, the phase change line 40 includes a first line 401, a heat exchange assembly 402, and a second line 403. The first pipe 401 communicates with the evaporator 20, and is provided with a drive pump 40a. The heat exchange assembly 402 is communicated with the first pipeline 401 and installed at the exhaust port 102a of the exhaust pipeline 102 of the compressor 10, for performing a heat exchange process between the liquid refrigerant pumped by the driving pump 40a and the refrigerant in the exhaust pipeline 102 to form a gaseous refrigerant. The second pipe 403 has one end communicating with the heat exchanging assembly 402 and the other end communicating with the suction port 101a, and is configured to input the gaseous refrigerant subjected to heat exchanging treatment to the suction port 101 a.

Therefore, the refrigerant in the evaporator is low-pressure low-temperature liquid refrigerant, and the method can pump the low-pressure low-temperature liquid refrigerant in the evaporator to the heat exchange assembly through the first pipeline and the driving pump. The refrigerant at the exhaust port of the exhaust pipeline is a high-pressure high-temperature refrigerant, and the low-pressure low-temperature liquid refrigerant and the high-pressure high-temperature refrigerant perform heat exchange treatment to form a low-temperature gaseous refrigerant. The aforesaid microthermal gaseous refrigerant is inputed to the port of breathing in of pipeline through the second pipeline, on the one hand, has improved the suction pressure of the port of breathing in, and on the other hand, avoids the refrigerant overheated that inputes to the port of breathing in through the second pipeline, reduces pressure differential more effectively, further promotes surge control's efficiency.

Optionally, heat exchange assembly 402 comprises a heat exchange coil. The heat exchange coil is fixedly connected with the exhaust pipeline. Heat exchange coil and exhaust pipe fixed connection can be for heat exchange coil and exhaust pipe welded fastening, also can be for heat exchange coil and exhaust pipe buckle are connected. Under the condition that the heat exchange coil is welded and fixed with the exhaust pipeline, the refrigerant flowing in the heat exchange coil can be prevented from leaking.

Optionally, the flow direction of the refrigerant in the heat exchange assembly 402 is different from the flow direction of the refrigerant in the exhaust pipe 102.

Therefore, the heat exchange quantity of the refrigerant in the heat exchange assembly and the refrigerant in the exhaust pipeline can be enhanced, and the heat exchange efficiency is improved.

Optionally, the flow direction of the refrigerant in the heat exchange assembly 402 is opposite to the flow direction of the refrigerant in the exhaust pipe 102. As an example, as shown in connection with FIG. 2, heat exchange assembly 402 has an input end 402a and an output end 402b. The input end 402a is spaced further from the exhaust port 102a than the output end 402b is spaced from the exhaust port 102 a.

Optionally, the outer wall of the heat exchange coil is provided with grooves arranged in an array. The shape of the groove can be fish scale shape and also can be spirally arranged. Therefore, the heat exchange efficiency of the refrigerant in the heat exchange coil and the refrigerant in the exhaust pipeline can be enhanced.

Optionally, according to the surge state, adjust the refrigerant flow of phase change pipeline, include:

the centrifugal chiller regulates the drive pump to turn on at an initial rotational speed in the event that a surge condition indicates that surge control is required.

Thus, the centrifugal refrigeration apparatus indicates that the suction pressure needs to be increased when it is determined that surge control is required based on the surge state. Therefore, the refrigeration equipment regulates the driving pump to be started at the initial rotating speed, so that the suction pressure is increased, and the surge is effectively prevented.

With reference to fig. 4, an embodiment of the present disclosure further provides a control method for a centrifugal refrigeration apparatus, including:

s11, the centrifugal refrigeration equipment obtains the surge state of the compressor.

S12, the centrifugal refrigeration equipment adjusts the driving pump to be started at the initial rotating speed when the surge state indicates that the surge control is needed.

And S13, the centrifugal refrigeration equipment acquires the current vibration value of the compressor and the current rotating speed of the compressor.

And S14, controlling the driving pump to increase the initial rotating speed by a preset variable quantity under the condition that the current vibration value of the centrifugal refrigeration equipment is larger than the preset vibration value and the current rotating speed is smaller than or equal to the preset rotating speed.

According to the control method for the centrifugal refrigeration equipment, when the current vibration value is larger than the preset vibration value and the current rotating speed is smaller than or equal to the rotating speed, the compressor is indicated to generate slight surge, and at the moment, the compressor needs to be subjected to surge control. At this time, in order to rapidly increase the suction pressure of the suction port of the compressor, the driving pump is controlled to increase the initial rotation speed by a preset variation amount, so that the compressor is switched from a slight surge to a normal operation state.

It is understood that the driving pump is controlled to increase the initial rotation speed by the preset variation, the initial rotation speed may be increased by the preset variation preset by the device for driving the pump, or the preset variation rate in unit time may be determined according to the preset variation and the initial rotation speed may be adjusted from the time dimension. As an example, R _Target ＝R _Initial +N·t。R _Target 、R _Initial N, t represent target rotational speed, initial rotational speed, preset rate of change, and duration information of the drive pump, respectively. The duration information represents duration information of a time period corresponding to the initial rotating speed to the target rotating speed.

Wherein the preset vibration value is greater than or equal to 0.2mm/s (millimeter/second). The preset rotating speed is the product of the surge speed and a preset coefficient K. 1< = K < =1.2.

In addition, the current rotating speed can be obtained by detecting the rotating speed of an inverter configured for the compressor, and can also be obtained by calculating according to the pressure ratio of the compressor.

As an example, R _{Preset of} ＝A·P ³ -B·P ² +C·P-D。R _{Preset of} Representing a preset rotational speed. P represents the pressure ratio of the compressor. A. B, C, D are all constants. The pressure ratio of the compressor is the ratio of the absolute pressure of the exhaust gas to the absolute pressure of the suction gas of the compressor. Specifically, an air suction pressure sensor is arranged at an air suction port of an air suction pipeline of the compressor, and an exhaust pressure sensor is arranged at an exhaust port of an exhaust pipeline. The suction pressure detected by the suction pressure sensor is P _{Air suction} . The exhaust pressure detected by the exhaust pressure sensor is P _{Exhaust of gases} The pressure ratio of the compressor

Wherein, P _atm Denotes standard atmospheric pressure, P _atm The value was 101.325kPa (kilopascal). Wherein kPa is the pressure unit.

With reference to fig. 5, an embodiment of the present disclosure further provides a control method for a centrifugal refrigeration apparatus, including:

s21, the centrifugal refrigeration equipment obtains the surge state of the compressor.

And S22, the centrifugal refrigeration equipment acquires the current vibration value of the compressor and the current rotating speed of the compressor.

And S23, controlling the driving pump to increase the initial rotating speed by the preset variation under the condition that the current vibration value of the centrifugal refrigeration equipment is larger than the preset vibration value and the current rotating speed is smaller than or equal to the preset rotating speed.

And S24, the centrifugal refrigeration equipment controls the control valve to be opened at a preset opening degree.

According to the control method for the centrifugal refrigeration equipment, due to the fact that the pressure increment value for increasing the suction pressure through the phase-change pipeline is limited, after the driving pump is controlled to increase the initial rotating speed by the preset variable quantity, the control valve is controlled to be opened by the preset opening degree, the refrigerant quantity of the suction port can be increased, and therefore surge control is conducted in cooperation with the phase-change pipeline, the compressor is rapidly switched to the normal operation state from slight surge, and the efficiency of the surge control is further improved.

Optionally, after the centrifugal refrigeration device controls the control valve to be opened at the preset opening, the opening of the control valve may be adjusted according to the newly obtained current vibration value and the newly obtained current rotation speed. As an example, the opening degree of the control valve is adjusted at a preset opening degree change rate in a case where the new current vibration value continues to be greater than the preset vibration value for a first preset time period and the new current rotation speed continues to be less than or equal to the preset rotation speed. The control method may preferentially perform the step of adjusting the initial rotation speed of the drive pump and then perform the step of adjusting the opening degree of the control valve, or may perform the step of adjusting the initial rotation speed of the drive pump and the step of performing the opening degree of the control valve simultaneously. This may not be particularly limited by the practice of the present disclosure.

It is understood that in the case where the new current vibration value continues to be greater than the preset vibration value for the second preset time period and the new current rotational speed continues to be less than or equal to the preset rotational speed, the drive pump may be adjusted to the maximum rotational speed and the control valve may be adjusted to the maximum opening degree. And the duration information of the second preset time period is greater than the duration information of the first preset time period.

With reference to fig. 6, an embodiment of the present disclosure further provides a control method for a centrifugal refrigeration apparatus, including:

s31, the centrifugal refrigeration equipment obtains the surge state of the compressor.

S32, the centrifugal refrigeration equipment adjusts the driving pump to be started at the initial rotating speed when the surge state indicates that the surge control is needed.

And S33, the centrifugal refrigeration equipment acquires the current vibration value of the compressor and the current rotating speed of the compressor.

And S34, controlling the driving pump to increase the initial rotating speed by a preset variable quantity by the centrifugal refrigeration equipment under the condition that the current vibration value is larger than the preset vibration value and the current rotating speed is smaller than or equal to the preset rotating speed.

And S35, the centrifugal refrigeration equipment acquires a new current vibration value and a new current rotating speed again.

And S36, when the new current vibration value is smaller than the preset vibration value and the new current rotating speed is larger than the preset rotating speed, the centrifugal refrigeration equipment obtains the current rotating speed of the driving pump and keeps the current rotating speed.

According to the control method for the centrifugal refrigeration equipment, after the centrifugal refrigeration equipment controls the driving pump to increase from the initial rotating speed by the preset change amount, the new current vibration value and the new current rotating speed are obtained again. And when the new current vibration value is smaller than the preset vibration value and the new current rotating speed is greater than the preset rotating speed, indicating that the current rotating speed of the driving pump enables the compressor to be out of surge. At this time, the current rotational speed of the drive pump is kept constant, so that the compressor is kept out of surge.

Alternatively, as shown in connection with fig. 7, obtaining a surge condition of the compressor includes:

and S41, the centrifugal refrigeration equipment acquires a target vibration value of the compressor and a target rotating speed of the compressor.

And S42, determining that the surge control is needed by the centrifugal refrigeration equipment under the condition that the target vibration value is larger than the preset vibration value and the target rotating speed is smaller than or equal to the preset rotating speed.

Thus, when the target vibration value is larger than the preset vibration value and the target rotating speed is smaller than or equal to the preset rotating speed, the possibility of surging occurring when the compressor is loaded is very high. Therefore, the need for surge control of the compressor can be determined from the vibration value and the rotational speed.

The embodiment of the present disclosure further provides a centrifugal refrigeration device, which includes a compressor, an evaporator, a related pipeline, and a controller. The compressor is provided with an air suction pipeline. And the evaporator is communicated with the air suction pipeline. And one end of the variable pipeline is communicated with the evaporator, and the other end of the variable pipeline is communicated with a gas suction port of a gas suction pipeline of the compressor and is used for carrying out heat exchange treatment on the liquid refrigerant provided by the evaporator to form a gaseous refrigerant. And the controller is used for obtaining the surge state of the compressor and adjusting the refrigerant flow of the phase change pipeline according to the surge state so as to improve the suction pressure of the suction port.

By adopting the centrifugal refrigeration equipment provided by the embodiment of the disclosure, the amount of the refrigerant input to the air suction port of the air suction pipeline through the phase change pipeline can be adjusted, and then the air suction pressure of the air suction port is improved, so that the pressure difference is reduced, the compressor is separated from surge or the compressor is prevented from surging, and the efficiency of surge control is improved.

In practical applications, the control method for the centrifugal refrigeration apparatus is based on the centrifugal refrigeration apparatus shown in fig. 1 and 2. The control valve is an electronic expansion valve. The control method comprises the following steps:

first, the centrifugal refrigerating apparatus detects a target vibration value and a target rotation speed of the compressor. When the target vibration value is less than the preset vibration value or the target rotation speed is greater than the preset rotation speed, the surge control is not required to be executed, that is, the driving pump is kept closed and the control valve is kept closed. When the target vibration value is larger than the preset vibration value and the target rotating speed is smaller than or equal to the preset rotating speed, surge control is required.

Secondly, when the surge control is determined, the current vibration value V is obtained _{At present} And the current rotational speed R _{At present} . At V _{At present} >V _Preset And R is _{At present} <＝R _{Preset of} At an initial rotation speed R _{Initiation of} And (4) opening.

At the initial speed R of the driving pump _Initial And after a third preset time period is started, a new current vibration value V 'is obtained again' _{At present} And a new current rotational speed R' _{At present} 。

At V' _{At present} >V _Preset And R' _{At present} <＝R _{Preset of} When the target rotation speed is determined to be R _{Object 1} ＝R _Initial +N·t ₁ ，t ₁ And time length information representing a third preset time period.

Reacquiring the updated current vibration value V " _{At present} And a new current rotational speed R' _{At present} 。

At V' _{At present} <V _{Preset of} And R " _{At present} >R _{Preset of} While controlling the driving pump to maintain R _{Object 1} 。

At V' _{At present} >V _{Preset of} And R' _{At present} <＝R _{Preset of} While controlling the driving pump R _{Object 2} ＝R _{Initiation of} +N·t ₂ And controlling the electronic expansion valve to be opened at a% of a preset opening degree t ₂ Indicating the initial speed R at which the pump is driven _Initial Time length information from the start to the current time.

After the adjustment, a new current vibration value V 'is obtained again' _{At present} And a new current speed R' _{At present} 。

At V' _{At present} >V _{Preset of} And R' _{At present} <＝R _{Preset of} When the driving pump is adjusted to the highest rotating speed, the electronic expansion valve is opened at the maximum opening degree.

Referring to fig. 8, an embodiment of the present disclosure provides a control device for a centrifugal refrigeration apparatus, which includes an obtaining module 201 and an executing module 202. The acquisition module 201 is configured to acquire a surge condition of the compressor for the centrifugal refrigeration apparatus; the execution module 202 is configured to adjust a refrigerant flow rate of the phase change line according to a surge condition to increase a suction pressure of the suction port.

By adopting the control device for the centrifugal refrigeration equipment, provided by the embodiment of the disclosure, the compressor is enabled to be separated from surge or the compressor is prevented from generating surge, and the efficiency of surge control is improved.

As shown in fig. 9, the present disclosure provides a control device for a centrifugal refrigeration apparatus, which includes a processor (processor) 100 and a memory (memory) 101. Optionally, the apparatus may also include a Communication Interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via a bus 103. The communication interface 102 may be used for information transfer. The processor 100 may invoke logic instructions in the memory 101 to perform the control method for the centrifugal refrigeration apparatus of the above-described embodiments.

In addition, the logic instructions in the memory 101 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.

The memory 101 is used as a computer readable storage medium for storing software programs, computer executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by executing program instructions/modules stored in the memory 101, namely, implements the control method for the centrifugal refrigeration apparatus in the above embodiment.

The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.

The embodiment of the disclosure provides a centrifugal refrigeration device, which comprises the control device for the centrifugal refrigeration device.

The disclosed embodiments provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described control method for a centrifugal refrigeration apparatus.

The disclosed embodiments provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the above-described control method for a centrifugal refrigeration apparatus.

The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.

The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising a …" does not exclude the presence of additional like elements in a process, method, or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.

Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims

1. A control method for a centrifugal refrigeration device is characterized in that the centrifugal refrigeration device comprises a phase change pipeline, one end of the phase change pipeline is communicated with an evaporator, the other end of the phase change pipeline is communicated with a suction port of a suction pipeline of a compressor, and the phase change pipeline is used for performing heat exchange treatment on liquid refrigerants provided by the evaporator to form gaseous refrigerants, and the method comprises the following steps:

obtaining a surge condition of the compressor;

according to the surge state, the refrigerant flow of the phase change pipeline is adjusted to improve the suction pressure of the suction port;

the phase change pipeline comprises:

a first pipeline which is communicated with the evaporator and is provided with a driving pump;

the heat exchange assembly is communicated with the first pipeline and is arranged at the exhaust port of an exhaust pipeline of the compressor, and is used for carrying out heat exchange treatment on the liquid refrigerant pumped by the driving pump and the refrigerant in the exhaust pipeline to form the gaseous refrigerant;

and one end of the second pipeline is communicated with the heat exchange assembly, the other end of the second pipeline is communicated with the air suction port, and the second pipeline is used for inputting the gaseous refrigerant subjected to heat exchange treatment to the air suction port.

2. The method of claim 1, wherein said adjusting a refrigerant flow rate of said phase change line based on said surge condition comprises:

in the event that the surge condition indicates that surge control is required, the drive pump is adjusted to turn on at an initial rotational speed.

3. The method of claim 2, wherein the adjusting the refrigerant flow of the phase change line based on the surge condition further comprises:

acquiring a current vibration value of the compressor and a current rotating speed of the compressor;

and under the condition that the current vibration value is larger than a preset vibration value and the current rotating speed is smaller than or equal to a preset rotating speed, controlling the driving pump to increase the initial rotating speed by a preset variation.

4. The method of claim 3, wherein the centrifugal refrigeration apparatus further comprises a bypass line, one end of the bypass line is communicated with a gas supply tank, the other end of the bypass line is communicated with a gas suction port of the gas suction line, the bypass line is configured with a control valve, and the control of the drive pump after increasing the initial rotation speed by a preset change amount further comprises:

and controlling the control valve to be opened at a preset opening degree.

5. The method of claim 3, wherein said adjusting said drive pump to turn on at an initial speed, after said surge condition indicates that surge control is required, further comprises:

re-acquiring a new current vibration value and a new current rotating speed;

and under the condition that the new current vibration value is smaller than the preset vibration value and the new current rotating speed is larger than the preset rotating speed, obtaining the current rotating speed of the driving pump and keeping the current rotating speed.

6. The method of claim 2, wherein said obtaining a surge condition of said compressor comprises:

acquiring a target vibration value of the compressor and a target rotating speed of the compressor;

and determining that surge control is needed under the condition that the target vibration value is larger than a preset vibration value and the target rotating speed is smaller than or equal to a preset rotating speed.

7. A centrifugal refrigeration apparatus, comprising:

a compressor provided with a suction line;

an evaporator in communication with the suction line;

one end of the phase change pipeline is communicated with the evaporator, and the other end of the phase change pipeline is communicated with a gas suction port of a gas suction pipeline of the compressor and used for carrying out heat exchange treatment on the liquid refrigerant provided by the evaporator to form a gaseous refrigerant;

the phase change pipeline comprises: a first pipeline which is communicated with the evaporator and is provided with a driving pump; the heat exchange assembly is communicated with the first pipeline and is arranged at the exhaust port of an exhaust pipeline of the compressor, and is used for carrying out heat exchange treatment on the liquid refrigerant pumped by the driving pump and the refrigerant in the exhaust pipeline to form the gaseous refrigerant; one end of the second pipeline is communicated with the heat exchange assembly, and the other end of the second pipeline is communicated with the air suction port, so that the gaseous refrigerant subjected to heat exchange treatment is input to the air suction port;

and the controller is used for obtaining the surge state of the compressor and adjusting the refrigerant flow of the phase change pipeline according to the surge state so as to improve the suction pressure of the suction port.

8. A control device for a centrifugal refrigeration apparatus, comprising a processor and a memory storing program instructions, characterized in that the processor is configured to execute the control method for a centrifugal refrigeration apparatus according to any one of claims 1 to 6 when executing the program instructions.

9. A centrifugal refrigeration apparatus comprising a control device for a centrifugal refrigeration apparatus as recited in claim 8.

10. A storage medium storing program instructions, characterized in that the program instructions, when executed, perform a control method for a centrifugal refrigeration apparatus according to any one of claims 1 to 6.