CN117345591A - Cooling system and cooling control method of suspension type compressor - Google Patents

Cooling system and cooling control method of suspension type compressor Download PDF

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Publication number
CN117345591A
CN117345591A CN202311648418.9A CN202311648418A CN117345591A CN 117345591 A CN117345591 A CN 117345591A CN 202311648418 A CN202311648418 A CN 202311648418A CN 117345591 A CN117345591 A CN 117345591A
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CN
China
Prior art keywords
cooling
temperature
frequency converter
motor
refrigerant
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Granted
Application number
CN202311648418.9A
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Chinese (zh)
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CN117345591B (en
Inventor
周宇
黄成武
梁海英
梁湖
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202311648418.9A priority Critical patent/CN117345591B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/25—Devices for sensing temperature, or actuated thereby
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/20—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil wherein the cooling medium vaporises within the machine casing
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
    • H05K7/20318—Condensers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
    • H05K7/20327—Accessories for moving fluid, for connecting fluid conduits, for distributing fluid or for preventing leakage, e.g. pumps, tanks or manifolds
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20936—Liquid coolant with phase change
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20945—Thermal management, e.g. inverter temperature control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a cooling system and a cooling control method of a suspension type compressor. The cooling system includes: the first cooling pipeline is connected with the liquid refrigerant outlet of the condenser at the first end and connected with the cooling flow passage inlet of the compressor at the second end; the first end of the second cooling pipeline is connected to the outlet of the cooling flow passage, and the second end of the second cooling pipeline is connected to the gaseous refrigerant inlet of the evaporator; the first cooling pipeline is sequentially provided with a first throttling element and a refrigerant pump along the refrigerant flow direction; the cooling branch is connected with the first throttling element in parallel, and a valve and a second throttling element are arranged on the cooling branch; the cooling flow passage comprises a frequency converter cooling part and a motor cooling part, wherein the frequency converter cooling part comprises a cooling flow passage inlet, and the motor cooling part comprises a cooling flow passage outlet. The cooling circuit is used for cooling the frequency converter and the motor, the structure is simple, the cooling flow is increased when the pressure difference is insufficient by the refrigerant pump, the cooling branch is increased by one-way throttling when the temperature of the cooling fluid is high, the temperature of the cooling fluid is reduced, and the overtemperature caused by insufficient cooling capacity is avoided.

Description

Cooling system and cooling control method of suspension type compressor
Technical Field
The invention relates to the technical field of compressor cooling, in particular to a cooling system and a cooling control method of a suspension type compressor.
Background
The oil-free direction such as magnetic suspension, gas suspension bearing has become current cooling water set trade mainstream, and for the refrigeration producer of partly no compressor self-control ability, integrated suspension compressor (can be magnetic suspension or gas suspension) is compared with the compressor advantage that needs the additional collocation converter, and integrated suspension compressor integrates the converter to the compressor, makes unit compact structure, and the management of being convenient for, the wiring is simple, also is applicable to the operation of data center multiple compressor simultaneously to the condition of improvement energy efficiency.
The cooling system of the conventional unit is divided into three paths after liquid is taken from the condenser, one path is used for cooling the motor, the other path is used for cooling lubricating oil, the other path is used for cooling the frequency converter, and finally the cooling system returns to the evaporator. Compared with the conventional oil bearing unit, the suspension type unit adopts oil-free and friction-free bearings such as magnetic suspension, air suspension and the like, and does not need cooling lubricating oil and bearings. The cooling scheme of the compressor is established on a certain pressure difference between condensing pressure and evaporating pressure, when the unit operates under a low-pressure ratio working condition, the pressure difference is too low, so that the flow of a cooling loop is too small, the cooling capacity is insufficient, the condition of overtemperature of a frequency converter and a motor winding is caused, and once the overtemperature of the frequency converter and the motor occurs, irrecoverable damage to the unit is caused. On the other hand, when the unit operates in a small load working condition, the unit intervenes in guide vanes, hot gas bypass and the like to adjust the load of the unit, so that the suction and exhaust pressure difference of the compressor is balanced, the condition that the pressure difference of liquid supply and air return on a cooling loop is too low can also occur, the cooling flow is insufficient, and finally the frequency converter and the motor are overtemperature; and under the working condition of small load, the temperature of the refrigerant led from the condenser is higher, and the refrigeration capacity is insufficient, so that the frequency converter and the motor are overtemperature.
Aiming at the problem that the insufficient cooling capacity of the suspension type compressor leads to the overtemperature of a frequency converter and a motor in the prior art, no effective solution is proposed at present.
Disclosure of Invention
The embodiment of the invention provides a cooling system and a cooling control method of a suspension type compressor, which at least solve the problem of over-temperature of a frequency converter and a motor caused by insufficient cooling capacity for cooling the suspension type compressor in the prior art.
In order to solve the above technical problems, an embodiment of the present invention provides a cooling system of a suspension compressor, including: the cooling system comprises a first cooling pipeline, a second cooling pipeline and a cooling branch;
a first end of the first cooling pipeline is connected to a liquid refrigerant outlet of the condenser, and a second end of the first cooling pipeline is connected to an inlet of a cooling flow passage of the suspension compressor;
the first end of the second cooling pipeline is connected to the outlet of the cooling flow channel, and the second end of the second cooling pipeline is connected to the gaseous refrigerant inlet of the evaporator;
the first cooling pipeline is sequentially provided with a first throttling element and a refrigerant pump along the refrigerant flow direction;
the cooling branch is connected with the first throttling element in parallel, and a valve and a second throttling element which are connected in series are arranged on the cooling branch;
the cooling flow passage comprises a frequency converter cooling part and a motor cooling part, wherein the frequency converter cooling part comprises an inlet of the cooling flow passage, and the motor cooling part comprises an outlet of the cooling flow passage.
Optionally, the cooling system further comprises: and the filtering device is connected between the first throttling element and the refrigerant pump, and the liquid refrigerant filtered by the filtering device flows to the inlet of the cooling flow passage.
Optionally, the cooling system further comprises: and the inlet of the one-way valve is connected to the gas outlet of the filtering device, and the outlet of the one-way valve is connected to the second cooling pipeline.
Optionally, the cooling system further comprises: and the third throttling element is positioned in the second cooling pipeline and used for throttling the refrigerant flowing to the gaseous refrigerant inlet of the evaporator.
Optionally, the cooling system further comprises:
the first temperature sensor is positioned at the frequency converter and used for detecting the temperature of the frequency converter;
the second temperature sensor is positioned at the motor and used for detecting the temperature of the motor;
and the third temperature sensor is positioned in the first cooling pipeline and used for detecting the temperature of the refrigerant flowing to the inlet of the cooling flow passage.
Optionally, a frequency converter is integrated on the suspension compressor.
The embodiment of the invention also provides a cooling control method of the suspension type compressor, which is applied to the cooling system of the suspension type compressor, and comprises the following steps:
determining that the suspension type compressor has an overtemperature risk;
determining a cause of the overtemperature;
if the reason for the overtemperature is the flow of the refrigerant entering the cooling flow passage, the refrigerant pump is started;
if the reason for the overtemperature is the temperature of the refrigerant entering the cooling flow passage, the valve is opened, so that the second throttling element throttles.
Optionally, determining that the suspension compressor is at risk of overtemperature includes:
monitoring the temperature of a motor and the temperature of a frequency converter;
judging whether the condition is satisfied once every a first preset time: the temperature of the motor is greater than the set temperature of the motor and lasts for a second preset time, or the temperature of the frequency converter is greater than the set temperature of the frequency converter and lasts for the second preset time;
and if the temperature of the motor is greater than the set temperature of the motor and lasts for a second preset time, or the temperature of the frequency converter is greater than the set temperature of the frequency converter and lasts for the second preset time, determining that the suspension type compressor has the overtemperature risk.
Optionally, determining the cause of the overtemperature includes:
judging whether the temperature of the refrigerant entering the cooling flow channel is smaller than the difference value between the set temperature of the frequency converter and the preset minimum temperature difference or whether the pressure difference between the condensing pressure and the evaporating pressure is smaller than the preset minimum pressure difference;
if the temperature of the refrigerant entering the cooling flow channel is smaller than the difference value between the set temperature of the frequency converter and the preset minimum temperature difference, or the pressure difference between the condensing pressure and the evaporating pressure is smaller than the preset minimum pressure difference, determining that the reason for over-temperature is the flow of the refrigerant entering the cooling flow channel;
if the temperature of the refrigerant entering the cooling flow channel is greater than or equal to the difference value between the set temperature of the frequency converter and the preset minimum temperature difference, and the pressure difference between the condensing pressure and the evaporating pressure is greater than or equal to the preset minimum pressure difference, determining that the reason for the overtemperature is the temperature of the refrigerant entering the cooling flow channel.
Optionally, after the refrigerant pump is turned on, the method further comprises:
and when the temperature of the motor is less than or equal to the set temperature of the motor and the temperature of the frequency converter is less than or equal to the set temperature of the frequency converter, the refrigerant pump is turned off.
Optionally, after opening the valve and throttling the second throttling element, the method further includes:
monitoring the temperature of the refrigerant entering the cooling flow channel;
calculating the temperature of the refrigerant entering the cooling flow channel to be subtracted (the set temperature of the frequency converter-the preset minimum temperature difference) so as to obtain an actual difference value;
if the actual difference value is larger than a preset difference value, reducing the opening of the second throttling element;
and if the actual difference value is smaller than or equal to a preset difference value, keeping the current opening of the second throttling element unchanged.
Optionally, after opening the valve and throttling the second throttling element, the method further includes:
and when the temperature of the motor is less than or equal to the set temperature of the motor and the temperature of the frequency converter is less than or equal to the set temperature of the frequency converter, closing the valve.
The embodiment of the invention also provides computer equipment, which comprises: memory, a processor and a computer program stored on the memory and executable on the processor, which processor implements the steps of the method according to the embodiments of the invention when the computer program is executed.
The embodiments of the present invention also provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of the embodiments of the present invention.
By applying the technical scheme of the invention, liquid is taken from the condenser, throttled into low-temperature liquid, the frequency converter is cooled firstly by using the same cooling flow channel, and then the motor is cooled, so that the frequency converter and the motor are cooled by one cooling loop, the cooling loop is simplified, the structure is simple, the maintenance is convenient, the energy is saved, and the environment is protected; the refrigerant pump is arranged, the refrigerant pump is started to provide enough pressure difference under the condition of insufficient pressure difference, the flow of the cooling loop is increased, the cooling capacity requirements of the frequency converter and the motor are met, and the problem that the frequency converter and the motor are overtemperature due to insufficient cooling capacity caused by insufficient pressure difference is avoided; the cooling branch comprising the valve and the second throttling element is arranged, the valve is opened under the condition that the temperature of cooling fluid is high, one path of throttling is increased by utilizing the second throttling element, the temperature of the cooling fluid can be reduced, the cooling capacity is increased, the cooling capacity requirements of the frequency converter and the motor are met, and the problem that the frequency converter and the motor are overtemperature due to insufficient cooling capacity caused by high temperature of the cooling fluid is avoided; the problem of in prior art carry out refrigerated cold volume not enough to suspension type compressor and lead to converter, motor overtemperature is solved, improve cooling circuit reliability, cooling scheme is reliable and stable under the special circumstances, and guarantees that the whole energy consumption of unit is low, energy-conserving high efficiency.
Drawings
FIG. 1 is a schematic diagram of a cooling system for a suspension compressor according to an embodiment of the present invention;
FIG. 2 is another schematic diagram of a cooling system for a suspension compressor according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for controlling cooling of a suspension compressor according to a second embodiment of the present invention;
FIG. 4 is a flow chart showing a method for controlling cooling of a suspension compressor according to a third embodiment of the present invention;
reference numerals illustrate:
the suspension compressor 1, the condenser 2, the throttle member 3, the evaporator 4, the inverter 11, the motor 12, the first throttle element 51, the refrigerant pump 52, the valve 53, the second throttle element 54, the filter 55, the check valve 56, the third throttle element 61, the first temperature sensor 13, the second temperature sensor 14, the third temperature sensor 57, the fourth temperature sensor 62, the condensing pressure sensor 21, and the evaporating pressure sensor 41.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and the claims and drawings of the present invention are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Alternative embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
The embodiment provides a cooling system of a suspension type compressor, wherein the suspension type compressor refers to a magnetic suspension type compressor or an air suspension type compressor.
Fig. 1 is a schematic diagram of a cooling system of a suspension compressor according to an embodiment of the present invention, where, as shown in fig. 1, a unit where the suspension compressor is located includes: the device comprises a suspension type compressor 1, a condenser 2, a throttling component 3 and an evaporator 4, wherein a high-temperature high-pressure gaseous refrigerant discharged by the suspension type compressor 1 enters the condenser 2 and is condensed into a liquid refrigerant, the liquid refrigerant enters the evaporator 4 for evaporation after being throttled by the throttling component 3 to become a gaseous refrigerant, and then the gaseous refrigerant returns to an air suction port of the suspension type compressor 1 to complete one-time refrigerant circulation.
The suspension compressor 1 comprises a frequency converter 11 and a motor 12, and the frequency converter 11 can be integrated on the suspension compressor 1 (namely, the integrated suspension compressor), so that the unit structure is compact, the management is convenient, and the wiring is simple.
The suspension compressor 1 is provided with cooling channels for cooling the frequency converter 11 and the motor 12. The cooling flow passage may be provided at the bottom of the cooled member or wound around the surface of the cooled member so that the cooling fluid (e.g., refrigerant) flowing through the cooling flow passage sufficiently reduces the temperature of the cooled member. The frequency converter 11 and the motor 12 may share the same cooling flow path, and specifically, the cooling flow path includes a frequency converter cooling portion including an inlet of the cooling flow path and a motor cooling portion including an outlet of the cooling flow path. Considering that the temperature of the motor is far higher than that of the frequency converter, the frequency converter 11 is cooled firstly by using the same cooling flow channel, and then the motor 12 is cooled, so that a cooling loop can be simplified, the maintenance is convenient, the energy is saved, and the energy efficiency of a unit is improved.
The cooling system includes: the cooling system comprises a first cooling pipeline, a second cooling pipeline and a cooling branch.
The first end of the first cooling line is connected to the liquid refrigerant outlet of the condenser 2 and the second end of the first cooling line is connected to the inlet of the cooling flow passage of the suspension compressor 1.
The first end of the second cooling line is connected to the outlet of the cooling flow channel, and the second end of the second cooling line is connected to the gaseous refrigerant inlet of the evaporator 4.
The first cooling line is provided with a first throttling element 51 and a refrigerant pump 52 in this order along the refrigerant flow direction. The first throttling element 51 throttles and cools the liquid refrigerant taken out from the condenser 2. The refrigerant pump 52 is used for pressurizing the refrigerant.
The cooling branch is connected in parallel with the first throttling element 51, and is provided with a valve 53 and a second throttling element 54 connected in series. The second throttling element 54 is used for throttling and cooling the liquid refrigerant taken out from the condenser 2. If the valve 53 is opened, the cooling branch is conducted, the second throttling element 54 is connected to the cooling loop, and one path of throttling is added; if the valve 53 is closed, the cooling branch is not conductive.
The high-temperature high-pressure liquid refrigerant is taken from the condenser 2 and throttled into a low-temperature liquid refrigerant, the low-temperature liquid refrigerant enters a cooling flow passage of the suspension type compressor 1, the low-temperature frequency converter 11 is cooled firstly, then the motor 12 with high temperature is cooled again, and finally the liquid absorbs heat to be gas and returns to the evaporator 4 to complete a loop.
In the embodiment, liquid is taken from the condenser 2, throttled into low-temperature liquid, the frequency converter 11 is cooled firstly by using the same cooling flow channel, and then the motor 12 is cooled, so that one cooling loop is realized to finish the cooling of the frequency converter 11 and the motor 12, the cooling loop is simplified, the structure is simple, the maintenance is convenient, and the energy conservation and the environmental protection are realized; the refrigerant pump 52 is arranged, the refrigerant pump 52 is started to provide enough pressure difference under the condition of insufficient pressure difference, the flow of the cooling loop is increased, the cooling capacity requirements of the frequency converter and the motor are met, and the problem that the frequency converter and the motor are overtemperature due to insufficient cooling capacity caused by insufficient pressure difference is avoided; the cooling branch comprising the valve 53 and the second throttling element 54 is arranged, the valve 53 is opened under the condition that the temperature of cooling fluid is high, one way of throttling is increased by utilizing the second throttling element 54, the temperature of the cooling fluid can be reduced, the cooling capacity is increased, the cooling capacity requirements of the frequency converter and the motor are met, and the problem that the frequency converter and the motor are overtemperature due to insufficient cooling capacity caused by high temperature of the cooling fluid is avoided; the problem of in prior art carry out refrigerated cold volume not enough to suspension type compressor and lead to converter, motor overtemperature is solved, improve cooling circuit reliability, cooling scheme is reliable and stable under the special circumstances, and guarantees that the whole energy consumption of unit is low, energy-conserving high efficiency.
As shown in fig. 2, the cooling system of the suspension type compressor further includes: the filtering device 55 is connected between the first throttling element 51 and the refrigerant pump 52, and the liquid refrigerant filtered by the filtering device 55 flows to the inlet of the cooling flow passage. The filtering device 55 is used for filtering a small amount of gas and other impurities generated after the refrigerant is throttled. In this embodiment, the high-temperature and high-pressure liquid taken out from the condenser 2 is throttled, a small amount of gaseous refrigerant is generated in the throttling process, the gaseous refrigerant is purified into low-temperature liquid by the filtering device 55, and the low-temperature liquid is sent into the cooling flow passage to cool the frequency converter and the motor, so that the cooling effect can be ensured.
The cooling system of the suspended compressor further includes: the check valve 56, the inlet of the check valve 56 is connected to the gas outlet of the filter device 55, and the outlet of the check valve 56 is connected to the second cooling line. That is, the check valve 56 is in one-way communication from the gas outlet of the filter device 55 in the direction of the second cooling line. In this embodiment, the check valve 56 can prevent the separated gas from flowing back, and discharge a small amount of gaseous refrigerant generated by the filtering device 55 to the evaporator 4 to continuously participate in the refrigerant circulation, so as to ensure the refrigerating or heating effect of the unit.
The cooling system of the suspended compressor further includes: the third throttling element 61 is located in the second cooling pipeline and is used for throttling the refrigerant flowing to the gaseous refrigerant inlet of the evaporator 4. In this embodiment, after the cooling fluid (liquid refrigerant) cools the frequency converter and the motor, the cooling fluid absorbs heat and gasifies into high-temperature and high-pressure gas, and the temperature is reduced by throttling through the third throttling element 61, so that the influence of the too high temperature of the gaseous refrigerant after cooling the motor on the heat exchange effect in the evaporator can be avoided.
The cooling system of the suspended compressor further includes: a first temperature sensor 13, located at the frequency converter 11, for detecting the frequency converter temperature; a second temperature sensor 14 is located at the motor 12 for detecting the motor temperature. Whether the overtemperature risk exists can be judged by detecting the temperature of the frequency converter and the temperature of the motor.
The cooling system of the suspended compressor further includes: the third temperature sensor 57 is located in the first cooling line and is used for detecting the temperature of the refrigerant flowing to the inlet of the cooling flow passage. By detecting the temperature of the refrigerant entering the cooling flow passage, whether the temperature of the cooling fluid is higher or not can be judged.
The cooling system of the suspended compressor may further include: a condensing pressure sensor 21 located at the condenser 2 for detecting condensing pressure; an evaporation pressure sensor 41, located at the evaporator 4, for detecting the evaporation pressure. The differential pressure condition of the unit can be judged by detecting the condensing pressure and the evaporating pressure.
The cooling system of the suspended compressor may further include: and a fourth temperature sensor 62, located in the second cooling pipeline, for detecting the temperature of the refrigerant flowing out through the cooling flow channel (i.e. the temperature of the refrigerant after cooling the inverter and the motor). If the temperature detected by the fourth temperature sensor 62 is high, this indicates that there is a risk of overtemperature.
Example two
The embodiment provides a cooling control method of a suspension compressor, which is applied to the cooling system of the suspension compressor.
Fig. 3 is a flowchart of a cooling control method of a suspension compressor according to a second embodiment of the present invention, as shown in fig. 3, the method includes the following steps:
s301, determining that there is an overtemperature risk of the suspension compressor 1.
S302, determining a reason for over-temperature.
If the reason for the overtemperature is the flow rate of the refrigerant entering the cooling flow passage, the refrigerant pump 52 is turned on at S303.
If the reason for the overtemperature is the temperature of the refrigerant entering the cooling flow passage, the valve 53 is opened to throttle the second throttling element 54.
When the unit operates under the working condition of low pressure ratio, insufficient pressure difference between condensing pressure and evaporating pressure can occur, so that the flow of cooling fluid is too small, the cooling capacity is insufficient, and the frequency converter and the motor are overtemperature. When the unit operates under a small load working condition, in order to maintain the small load stable operation of the unit, after the guide vanes are regulated and the hot gas bypass butterfly valve is opened, the suction and exhaust pressure is balanced, the pressure difference is reduced, the flow of cooling fluid is too small, the temperature of the refrigerant introduced from the condenser is too high, the cold quantity is insufficient, and the frequency converter and the motor are overtemperature. Thus, the reason for the over-temperature of the suspension compressor may be that the cooling fluid flow is too small or the cooling fluid temperature is too high.
In the embodiment, liquid is taken from the condenser 2, throttled into low-temperature liquid, the frequency converter 11 is cooled firstly by using the same cooling flow channel, and then the motor 12 is cooled, so that one cooling loop is realized to finish the cooling of the frequency converter 11 and the motor 12, the cooling loop is simplified, the structure is simple, the maintenance is convenient, and the energy conservation and the environmental protection are realized; if the reason for the overtemperature is that the flow rate of the refrigerant entering the cooling flow passage is too small (namely, the pressure difference is insufficient), the refrigerant pump 52 is started to provide enough pressure difference, the flow rate of the cooling circuit is increased, the cooling capacity requirements of the frequency converter and the motor are met, and the problem that the overtemperature of the frequency converter and the motor is caused by insufficient cooling capacity due to insufficient pressure difference is avoided; if the reason for the overtemperature is that the temperature of the refrigerant entering the cooling flow channel is higher, the valve 53 is opened, one-way throttling is increased by utilizing the second throttling element 54, so that the temperature of cooling fluid is reduced, the cooling capacity is increased, the cooling capacity requirements of the frequency converter and the motor are met, and the problem that the overtemperature of the frequency converter and the motor is caused by insufficient cooling capacity due to high temperature of the cooling fluid is avoided; the control unit is adapted to different cooling methods under different operation conditions, so that the problem of overtemperature of the frequency converter and the motor caused by insufficient cooling capacity for cooling the suspension type compressor in the prior art is solved, the reliability of a cooling loop is improved, the cooling scheme is stable and reliable under special conditions, the whole energy consumption of the unit is ensured to be low, and the energy conservation and the high efficiency are realized.
In one embodiment, determining that there is a risk of over-temperature of the suspended compressor 1 comprises:
monitoring the temperature of a motor and the temperature of a frequency converter;
judging whether the condition is satisfied once every a first preset time: the temperature of the motor is greater than the set temperature of the motor and lasts for a second preset time, or the temperature of the frequency converter is greater than the set temperature of the frequency converter and lasts for the second preset time;
if the motor temperature is greater than the motor set temperature and lasts for the second preset time, or the frequency converter temperature is greater than the frequency converter set temperature and lasts for the second preset time, the fact that the suspension type compressor 1 is at the overtemperature risk is determined.
The first preset time is a period for judging whether the overtemperature risk exists or not, and the first preset time and the second preset time can be set according to actual conditions, wherein the first preset time is smaller than the second preset time.
The motor set temperature is used for measuring whether the actual motor temperature exceeds the temperature, and the motor set temperature can be the bearable motor temperature minus a preset value. The set temperature of the frequency converter is used for measuring whether the actual temperature of the frequency converter exceeds the temperature, and the set temperature of the frequency converter can be the bearable temperature of the frequency converter minus a preset value. A certain margin is reserved for setting the set temperature of the motor and the set temperature of the frequency converter, so that the motor is stable and the normal operation of the suspension type compressor can be ensured.
The present embodiment can effectively and quickly determine whether the suspension compressor 1 has an overtemperature risk based on the motor set temperature and the inverter set temperature.
In one embodiment, determining the cause of the overtemperature includes:
judging whether the temperature of the refrigerant entering the cooling flow channel is smaller than the difference value between the set temperature of the frequency converter and the preset minimum temperature difference or whether the pressure difference between the condensing pressure and the evaporating pressure is smaller than the preset minimum pressure difference;
if the temperature of the refrigerant entering the cooling flow channel is smaller than the difference value between the set temperature of the frequency converter and the preset minimum temperature difference, or the pressure difference between the condensing pressure and the evaporating pressure is smaller than the preset minimum pressure difference, determining that the reason for the overtemperature is the flow of the refrigerant entering the cooling flow channel;
if the temperature of the refrigerant entering the cooling flow channel is greater than or equal to the difference between the set temperature of the frequency converter and the preset minimum temperature difference, and the pressure difference between the condensing pressure and the evaporating pressure is greater than or equal to the preset minimum pressure difference, determining that the reason for the overtemperature is the temperature of the refrigerant entering the cooling flow channel.
The preset minimum temperature difference is a temperature difference value between a set temperature of the frequency converter and a highest temperature of cooling fluid capable of cooling the frequency converter. The preset minimum pressure difference refers to the minimum pressure difference between the condensing pressure and the evaporating pressure required for cooling the fluid. The preset minimum temperature difference and the preset minimum pressure difference can be set according to actual conditions.
Specifically, if the temperature of the refrigerant entering the cooling flow channel is smaller than the difference between the set temperature of the frequency converter and the preset minimum temperature difference, the current actual temperature of the cooling fluid is lower than the highest temperature of the cooling fluid which can cool the frequency converter, the frequency converter can be effectively cooled, the temperature of the cooling fluid is not high, and the reason for the over-temperature is caused by small flow rate of the cooling fluid or high temperature of the cooling fluid, at the moment, the fact that the temperature of the cooling fluid is not high is determined, so that the reason for the over-temperature is judged to be that the flow rate of the cooling fluid is small.
If the pressure difference between the condensing pressure and the evaporating pressure is smaller than the preset minimum pressure difference, namely the pressure difference is insufficient, it can be determined that the reason for the over-temperature is that the flow of the cooling fluid is small.
If the temperature of the refrigerant entering the cooling flow channel is larger than or equal to the difference value between the set temperature of the frequency converter and the preset minimum temperature difference, and the pressure difference between the condensing pressure and the evaporating pressure is smaller than the preset minimum pressure difference, the condition that the flow rate of the cooling fluid is small and the temperature of the cooling fluid is high possibly exists at the same time, the cooling effect of increasing the flow rate is better than that of reducing the cooling temperature, the flow rate is firstly increased, after the flow rate is increased, the pressure difference meets the requirement, namely, the pressure difference between the condensing pressure and the evaporating pressure is larger than or equal to the preset minimum pressure difference, if the temperature of the refrigerant entering the cooling flow channel is still larger than or equal to the difference value between the set temperature of the frequency converter and the preset minimum temperature difference, the reason that the temperature of the cooling fluid is high can be judged, and one more throttling can be added at the moment, so as to optimize the cooling effect.
According to the embodiment, the reason for the over-temperature can be rapidly and accurately judged, so that a corresponding cooling scheme is adopted.
In one embodiment, after turning on the refrigerant pump 52, it further includes: when the motor temperature is less than or equal to the motor set temperature and the inverter temperature is less than or equal to the inverter set temperature, the refrigerant pump 52 is turned off. The cooling fluid flow is increased by turning on the refrigerant pump 52 to reduce the motor and inverter temperatures, and then if neither the motor temperature nor the inverter temperature is detected to be continuously over-heated, the refrigerant pump 52 can be turned off in time.
In one embodiment, after the valve 53 is opened to throttle the second throttling element 54, the opening of the second throttling element 54 may be adjusted according to the temperature of the refrigerant entering the cooling flow passage, specifically, the temperature of the refrigerant entering the cooling flow passage is monitored; calculating the temperature of the refrigerant entering the cooling flow channel to be subtracted (the set temperature of the frequency converter is the preset minimum temperature difference) so as to obtain an actual difference value; if the actual difference is greater than the preset difference, decreasing the opening of the second throttling element 54; if the actual difference is less than or equal to the preset difference, the current opening of the second throttling element 54 is kept unchanged.
The preset difference is used for measuring the deviation degree of the current actual temperature of the cooling fluid and the highest temperature of the cooling fluid which can cool the frequency converter, and the preset difference can be set according to the actual situation.
When the temperature of the cooling fluid (i.e. the temperature of the refrigerant entering the cooling flow passage) is greater than or equal to the difference value between the set temperature of the frequency device and the preset minimum temperature difference, opening the valve 53, and adjusting the opening of the second throttling element 54 according to the actual difference value, specifically, if the actual difference value is greater than the preset difference value, it means that the current actual temperature of the cooling fluid exceeds the difference value between the set temperature of the frequency device and the preset minimum temperature difference more, i.e. the current actual temperature of the cooling fluid is higher, at this time, the opening of the second throttling element 54 is reduced to perform throttling and cooling; if the actual difference is less than or equal to the preset difference, it means that the difference between the current actual temperature of the cooling fluid and the preset minimum temperature difference is not too great, i.e. the current actual temperature of the cooling fluid is too high, and the current opening of the second throttling element 54 can be kept unchanged.
According to the embodiment, the opening of the second throttling element 54 can be timely adjusted according to the temperature of the refrigerant entering the cooling flow passage, so that the temperature of cooling fluid can be timely and better reduced, the cooling effect is ensured, and the overtemperature of the compressor frequency converter and the motor is avoided.
In one embodiment, after opening the valve 53 to throttle the second throttling element 54, further comprising: when the motor temperature is less than or equal to the motor set temperature and the inverter temperature is less than or equal to the inverter set temperature, the valve 53 is closed. By increasing one way of throttling, the cooling fluid temperature is reduced to reduce the motor and inverter temperatures, and then if neither the motor temperature nor the inverter temperature is detected to be continuously over-heated, the valve 53 can be closed in time.
Example III
The cooling system and the cooling control method of the above-mentioned suspension compressor are described below with reference to a specific embodiment, however, it should be noted that this specific embodiment is only for better illustrating the present application, and should not be construed as unduly limiting the present application. The same or corresponding terms as those of the above embodiments are explained, and the present embodiment will not be repeated.
For the cooling system shown in fig. 2, a path of high-temperature high-pressure liquid refrigerant is taken from the condenser 2, throttled by the first throttling element 51, a small part of gas generated after throttling and impurities in the refrigerant are filtered by the filtering device 55, then the small part of gas enters the evaporator 4 through the one-way valve 56 and returns to the refrigeration cycle, the filtered low-temperature liquid refrigerant enters the cooling flow passage arranged at the bottom of the frequency converter 11 in the suspension type compressor 1, the frequency converter 11 is cooled firstly, then enters the cooling flow passage of the motor 12, the motor 12 is cooled, the final liquid refrigerant absorbs heat to be high-temperature high-pressure gas, the temperature is throttled by the third throttling element 61, so that the temperature of the gaseous refrigerant after cooling the motor is prevented from being too high, and the heat exchange effect in the evaporator 4 is influenced.
When the unit operates under the low-pressure ratio working condition, the pressure difference between the condensing pressure and the evaporating pressure is insufficient to provide the power of the cooling loop, the refrigerant pump 52 is started to provide enough pressure difference, the flow of the cooling loop is increased, the cooling capacity is increased, the cooling requirements of the frequency converter and the motor are met, and the reliability of the cooling loop is improved; when the unit operates under the working condition of small load, on one hand, in order to maintain the stable operation of the small load of the centrifugal unit, after the guide vane is regulated and the hot gas bypass butterfly valve is opened, the suction and exhaust pressure is balanced, the pressure difference is reduced, the refrigerant pump 52 is opened to boost pressure, on the other hand, the temperature of the refrigerant introduced from the condenser 2 is high, the valve 53 is opened, one-way throttling is increased, and the cold quantity after throttling is increased so as to meet the cooling flow.
Referring to fig. 2, the inverter temperature detected by the first temperature sensor 13 is denoted by T1, the motor temperature detected by the second temperature sensor 14 is denoted by T2, the refrigerant temperature flowing to the cooling flow path inlet (i.e., the cooling fluid temperature) detected by the third temperature sensor 57 is denoted by T3, the condensing pressure detected by the condensing pressure sensor 21 is denoted by P2, and the evaporating pressure detected by the evaporating pressure sensor 41 is denoted by P1.
As shown in fig. 4, a specific flowchart of a cooling control method of a suspension compressor includes the following steps:
s401, the system judges whether the following conditions are met every t1 seconds: t2 > T Motor max And last for T2 seconds, or, T1 > T Frequency converter max And lasts t2 seconds. If yes, the motor or the frequency converter is considered to have overtemperature risk, and S402 is entered; if not, the process advances to S404.
t1 represents a first preset time, t2 represents a second preset time, and both t1 and t2 can be manually set and adjusted, not fixed values. For example, t2 is generally 5 to 10 times t 1.
T Motor max Indicating the set temperature of the motor, T Frequency converter max Indicating the set temperature of the frequency converter, T Motor max And T Frequency converter max Can be manually set and adjusted, and is not a fixed value.
S402, judging the reason of the overtemperature risk, namely, whether the overtemperature risk is caused by small flow of the cooling fluid or caused by high temperature of the cooling fluid. Specifically, whether the following conditions are satisfied: t3 < T Frequency converter max -DeltaT, or P2-P1 < DeltaP Cooling for min If yes, the process proceeds to S403, and if no, the process proceeds to S407.
Δt represents a preset minimum temperature difference, and Δt can be manually set and adjusted, not a fixed value. ΔP Cooling for min Indicating a preset minimum pressure differential.
S403, judging that the cooling fluid flow is small, so that the cooling capacity is insufficient, and the temperature is over-temperature, starting the refrigerant pump 52 to boost pressure, increasing the cooling flow and reducing the temperature of the motor and the frequency converter.
If T3 is less than T Frequency converter max Delta T, which means that the current actual temperature of the cooling fluid is lower than the highest temperature of the cooling fluid which can cool the frequency converter, the frequency converter can be cooled effectively, the temperature of the cooling fluid is not high, because the over temperature is caused by the small flow rate of the cooling fluid or the high temperature of the cooling fluid, at this time, it is determined that the temperature of the cooling fluid is not high, and therefore, the reason for the over temperature can be determined that the flow rate of the cooling fluid is small.
If P2-P1 < DeltaP Cooling for min I.e. insufficient pressure difference, it can be determined that the reason for the over-temperature is that the cooling fluid flow is small.
S404, judging whether the valve 53 and the refrigerant pump 52 are opened, if the valve 53 and the refrigerant pump 52 are not opened, proceeding to S406, if at least one of the valve 53 and the refrigerant pump 52 is opened, proceeding to S405.
S405, the valve 53 and/or the refrigerant pump 52 that have been opened at present are closed. That is, if the refrigerant pump 52 is already turned on, the refrigerant pump 52 is turned off when the motor and the inverter are detected not to continuously overheat; if the valve 53 has been opened, the valve 53 is closed when it is detected that the motor and the frequency converter are not continuously over-heated.
S406, maintaining the current running state.
S407, judging that the cooling fluid is insufficient in cooling capacity and is overtemperature due to high temperature, opening the valve 53, inserting the second throttling element 54, increasing one-way throttling, reducing the temperature of the cooling fluid after throttling, and reducing the temperatures of the motor and the frequency converter.
If T3 is greater than or equal to T Frequency converter max -DeltaT and P2-P1 < DeltaP Cooling for min The conditions of small flow rate and high temperature of the cooling fluid can be simultaneously existed, the cooling effect of increasing the flow rate is better than that of reducing the cooling temperature, in this case, the flow rate is firstly increased, and after the flow rate is increased, the pressure difference meets the requirement, namely that P2-P1 is more than or equal to delta P Cooling for min If it is determined that T3 is not less than T still exists next time Frequency converter max At, it can be determined that the reason for the over-temperature is that the cooling fluid temperature is high, at which time a throttle can be added to optimize the cooling effect.
S408, the opening degree of the second throttle element 54 is adjusted.
Specifically, T3 is monitored, and T3- (T) is calculated Frequency converter max - Δt), obtaining an actual difference; if the actual difference is greater than the preset difference, decreasing the opening of the second throttling element 54; if the actual difference is less than or equal to the preset difference, the current opening of the second throttling element 54 is kept unchanged.
In the embodiment, liquid is taken from the condenser 2, throttled into low-temperature liquid, the frequency converter 11 is cooled firstly by using the same cooling flow channel, and then the motor 12 is cooled, so that one cooling loop is realized to finish the cooling of the frequency converter 11 and the motor 12, the cooling loop is simplified, the structure is simple, the maintenance is convenient, and the energy conservation and the environmental protection are realized; if the reason for the overtemperature is that the flow rate of the refrigerant entering the cooling flow channel is too small (namely, the pressure difference is insufficient), the refrigerant pump 52 is started to provide enough pressure difference, the flow rate of the cooling loop is increased, the cooling capacity is increased, so that the cooling capacity requirements of the frequency converter and the motor are met, the problem that the overtemperature of the frequency converter and the motor is caused by insufficient cooling capacity due to insufficient pressure difference is avoided, the stability and the reliability of a cooling system in special conditions are ensured, the overall lower energy consumption of the unit is also ensured, and the energy efficiency advantage of the unit is ensured; if the reason for the overtemperature is that the temperature of the refrigerant entering the cooling flow channel is higher, the valve 53 is opened, one-way throttling is increased by using the second throttling element 54 to reduce the temperature of cooling fluid and increase the cooling capacity so as to meet the cooling capacity requirements of the frequency converter and the motor and avoid the problem of overtemperature of the frequency converter and the motor caused by insufficient cooling capacity due to high temperature of the cooling fluid; the control unit is adapted to different cooling methods under different operation conditions, so that the problem of overtemperature of the frequency converter and the motor caused by insufficient cooling capacity for cooling the suspension type compressor in the prior art is solved, the reliability of a cooling loop is improved, the cooling scheme is stable and reliable under special conditions, the whole energy consumption of the unit is ensured to be low, and the energy conservation and the high efficiency are realized.
Example IV
The present embodiment provides a computer device including: memory, a processor and a computer program stored on the memory and executable on the processor, which processor implements the steps of the method according to the embodiments of the invention when the computer program is executed.
Example five
The present embodiment provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method according to the embodiments of the present invention.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (14)

1. A cooling system for a suspension compressor, comprising: the cooling system comprises a first cooling pipeline, a second cooling pipeline and a cooling branch;
a first end of the first cooling pipeline is connected to a liquid refrigerant outlet of the condenser, and a second end of the first cooling pipeline is connected to an inlet of a cooling flow passage of the suspension compressor;
the first end of the second cooling pipeline is connected to the outlet of the cooling flow channel, and the second end of the second cooling pipeline is connected to the gaseous refrigerant inlet of the evaporator;
the first cooling pipeline is sequentially provided with a first throttling element and a refrigerant pump along the refrigerant flow direction;
the cooling branch is connected with the first throttling element in parallel, and a valve and a second throttling element which are connected in series are arranged on the cooling branch;
the cooling flow passage comprises a frequency converter cooling part and a motor cooling part, wherein the frequency converter cooling part comprises an inlet of the cooling flow passage, and the motor cooling part comprises an outlet of the cooling flow passage.
2. The cooling system of a suspension compressor of claim 1, further comprising: and the filtering device is connected between the first throttling element and the refrigerant pump, and the liquid refrigerant filtered by the filtering device flows to the inlet of the cooling flow passage.
3. The cooling system of a suspension compressor of claim 2, further comprising: and the inlet of the one-way valve is connected to the gas outlet of the filtering device, and the outlet of the one-way valve is connected to the second cooling pipeline.
4. The cooling system of a suspension compressor of claim 1, further comprising:
and the third throttling element is positioned in the second cooling pipeline and used for throttling the refrigerant flowing to the gaseous refrigerant inlet of the evaporator.
5. The cooling system of a suspension compressor of claim 1, further comprising:
the first temperature sensor is positioned at the frequency converter and used for detecting the temperature of the frequency converter;
the second temperature sensor is positioned at the motor and used for detecting the temperature of the motor;
and the third temperature sensor is positioned in the first cooling pipeline and used for detecting the temperature of the refrigerant flowing to the inlet of the cooling flow passage.
6. Cooling system of a suspended compressor according to any one of claims 1-5, characterized in that a frequency converter is integrated on the suspended compressor.
7. A cooling control method of a suspension compressor, characterized by being applied to a cooling system of a suspension compressor according to any one of claims 1 to 6, the method comprising:
determining that the suspension type compressor has an overtemperature risk;
determining a cause of the overtemperature;
if the reason for the overtemperature is the flow of the refrigerant entering the cooling flow passage, the refrigerant pump is started;
if the reason for the overtemperature is the temperature of the refrigerant entering the cooling flow passage, the valve is opened, so that the second throttling element throttles.
8. The method of claim 7, wherein determining that the suspended compressor is at risk of over-temperature comprises:
monitoring the temperature of a motor and the temperature of a frequency converter;
judging whether the condition is satisfied once every a first preset time: the temperature of the motor is greater than the set temperature of the motor and lasts for a second preset time, or the temperature of the frequency converter is greater than the set temperature of the frequency converter and lasts for the second preset time;
and if the temperature of the motor is greater than the set temperature of the motor and lasts for a second preset time, or the temperature of the frequency converter is greater than the set temperature of the frequency converter and lasts for the second preset time, determining that the suspension type compressor has the overtemperature risk.
9. The method of claim 7, wherein determining the cause of the overtemperature comprises:
judging whether the temperature of the refrigerant entering the cooling flow channel is smaller than the difference value between the set temperature of the frequency converter and the preset minimum temperature difference or whether the pressure difference between the condensing pressure and the evaporating pressure is smaller than the preset minimum pressure difference;
if the temperature of the refrigerant entering the cooling flow channel is smaller than the difference value between the set temperature of the frequency converter and the preset minimum temperature difference, or the pressure difference between the condensing pressure and the evaporating pressure is smaller than the preset minimum pressure difference, determining that the reason for over-temperature is the flow of the refrigerant entering the cooling flow channel;
if the temperature of the refrigerant entering the cooling flow channel is greater than or equal to the difference value between the set temperature of the frequency converter and the preset minimum temperature difference, and the pressure difference between the condensing pressure and the evaporating pressure is greater than or equal to the preset minimum pressure difference, determining that the reason for the overtemperature is the temperature of the refrigerant entering the cooling flow channel.
10. The method of claim 7, further comprising, after turning on the refrigerant pump:
and when the temperature of the motor is less than or equal to the set temperature of the motor and the temperature of the frequency converter is less than or equal to the set temperature of the frequency converter, the refrigerant pump is turned off.
11. The method of claim 7, further comprising, after opening the valve to throttle the second throttling element:
monitoring the temperature of the refrigerant entering the cooling flow channel;
calculating the temperature of the refrigerant entering the cooling flow channel to be subtracted (the set temperature of the frequency converter-the preset minimum temperature difference) so as to obtain an actual difference value;
if the actual difference value is larger than a preset difference value, reducing the opening of the second throttling element;
and if the actual difference value is smaller than or equal to a preset difference value, keeping the current opening of the second throttling element unchanged.
12. The method of claim 7, further comprising, after opening the valve to throttle the second throttling element:
and when the temperature of the motor is less than or equal to the set temperature of the motor and the temperature of the frequency converter is less than or equal to the set temperature of the frequency converter, closing the valve.
13. A computer device, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 7 to 12 when the computer program is executed by the processor.
14. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of the method of any of claims 7 to 12.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103175276A (en) * 2013-04-12 2013-06-26 南京佳力图空调机电有限公司 Air-cooling direct-current frequency-conversion magnetic levitation nature cold source water chilling unit
CN208671411U (en) * 2018-07-27 2019-03-29 珠海格力电器股份有限公司 Cooling system
CN109654779A (en) * 2018-11-28 2019-04-19 珠海格力电器股份有限公司 Control device, control method, compressor and the air-conditioning of compressor magnetic suspension bearing
CN218093616U (en) * 2022-09-21 2022-12-20 珠海格力电器股份有限公司 Compressor unit and air conditioner
CN218781453U (en) * 2022-10-28 2023-03-31 珠海格力电器股份有限公司 Cooling system and air conditioning unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103175276A (en) * 2013-04-12 2013-06-26 南京佳力图空调机电有限公司 Air-cooling direct-current frequency-conversion magnetic levitation nature cold source water chilling unit
CN208671411U (en) * 2018-07-27 2019-03-29 珠海格力电器股份有限公司 Cooling system
CN109654779A (en) * 2018-11-28 2019-04-19 珠海格力电器股份有限公司 Control device, control method, compressor and the air-conditioning of compressor magnetic suspension bearing
CN218093616U (en) * 2022-09-21 2022-12-20 珠海格力电器股份有限公司 Compressor unit and air conditioner
CN218781453U (en) * 2022-10-28 2023-03-31 珠海格力电器股份有限公司 Cooling system and air conditioning unit

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