CN107356018B - Air conditioning system and compressor spray control method - Google Patents
Air conditioning system and compressor spray control method Download PDFInfo
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- CN107356018B CN107356018B CN201710637070.1A CN201710637070A CN107356018B CN 107356018 B CN107356018 B CN 107356018B CN 201710637070 A CN201710637070 A CN 201710637070A CN 107356018 B CN107356018 B CN 107356018B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
- F25B1/047—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
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- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to an air conditioning system and a compressor spray control method, wherein the air conditioning system comprises: the device comprises a compressor (1) for forming a refrigerant circulation flow path, a condenser (2), a first throttling unit (3) and an evaporator (4), wherein an air suction liquid spraying flow path (f 1) for communicating an air suction port of the compressor (1) is also branched on the refrigerant circulation flow path corresponding to a refrigerant outlet pipe of the condenser (2), and the device further comprises a liquid homogenizing mechanism (5) arranged in front of the air suction port of the compressor (1) and used for pre-uniformly mixing the refrigerant downstream of an outlet of the evaporator (4) and the refrigerant from the air suction liquid spraying flow path (f 1). The invention utilizes the liquid homogenizing mechanism to pre-uniformly mix the refrigerant of the evaporator and the refrigerant of the air suction liquid spraying flow path so as to promote the region balance of the air suction temperature field in front of the air suction port, thereby reducing the possibility of frequent fluctuation of the throttling unit and frequent loading and unloading of the compressor, and further eliminating the adverse effect of the air suction liquid spraying process of the compressor on the air conditioning system as much as possible.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an air conditioning system and a compressor spray control method.
Background
In marine air conditioning units, the load application range of the marine screw compressor is typically 25% to 100%. There is a real need to extend the operating range of a marine screw compressor, which requires that the lower limit of the load application range be extended to 20% or even lower. When the marine screw compressor runs at low load, the compressor motor is often overheated or exhausted and overheated for protection and even stop due to the insufficient cooling capacity for cooling the compressor motor because of the relatively small refrigerant circulation amount.
In order to solve the problem, the refrigerant circulation amount is mainly supplemented by adopting an air suction liquid spraying mode, namely, supercooled liquid is taken from a condenser and returned to an air suction port of the compressor through throttling, and the exhaust temperature of the compressor is reduced by adopting a mode that the supercooled liquid reduces the air suction temperature. However, the air suction spraying mode can cause unbalance of a temperature field area, and the unbalance of the temperature field area causes frequent change of the opening degree of an electronic expansion valve in the marine air conditioning unit, so that the marine screw compressor is frequently loaded and unloaded, and the water temperature of water supply is unstable.
Disclosure of Invention
The invention aims to provide an air conditioning system and a compressor spray control method, which can eliminate adverse effects of an air suction spray process of a compressor on parts of the air conditioning system as much as possible.
To achieve the above object, the present invention provides an air conditioning system comprising: the device comprises a compressor, a condenser, a first throttling unit and an evaporator, wherein the compressor, the condenser, the first throttling unit and the evaporator are used for forming a refrigerant circulation flow path, an air suction liquid spraying flow path used for communicating an air suction port of the compressor is also branched on the refrigerant circulation flow path corresponding to a refrigerant outlet pipe of the condenser, and the device further comprises a liquid homogenizing mechanism arranged in front of the air suction port of the compressor and used for pre-uniformly mixing the refrigerant at the downstream of an outlet of the evaporator and the refrigerant from the air suction liquid spraying flow path.
Further, the liquid homogenizing mechanism comprises a liquid separator or a liquid homogenizing plate with multiple holes.
Further, a liquid spraying valve is arranged in the air suction liquid spraying flow path and used for controlling the on-off of the air suction liquid spraying flow path.
Further, a plurality of first temperature sampling points are arranged on a refrigerant circulation flow path between the liquid homogenizing mechanism and the air suction port of the compressor, and the air conditioning system further comprises a control unit, wherein the control unit can control the opening of the first throttling unit and/or the load loading and unloading of the compressor according to the received liquid spraying front temperature value of each first temperature sampling point when the liquid spraying valve is closed and the liquid spraying rear temperature value when the liquid spraying valve is opened.
Further, the plurality of first temperature sampling points are at least three and are uniformly arranged at intervals along the circumferential direction of the refrigerant circulating flow path between the air suction ports of the compressor.
Further, a second temperature sampling point is further arranged on the refrigerant circulating flow path in front of the liquid homogenizing mechanism, and the control unit can also control the opening of the first throttling unit and/or the load loading and unloading of the compressor according to the received post-spraying temperature value of the second temperature sampling point when the spraying valve is opened.
Further, the first throttling unit comprises an electronic expansion valve, the liquid spraying valve comprises a liquid spraying electromagnetic valve, and the electronic expansion valve and the liquid spraying electromagnetic valve are both in communication connection with the control unit.
Further, the compressor is a marine screw compressor, and the air conditioning system is a marine air conditioning unit.
In order to achieve the above object, the present invention provides a compressor spray control method based on the above air conditioning system, comprising:
the control unit receives a pre-spraying temperature value of each first temperature sampling point when the spraying valve is closed and a post-spraying temperature value when the spraying valve is opened;
the control unit controls the opening of the first throttling unit and/or the load loading and unloading of the compressor according to the temperature value before spraying and the temperature value after spraying corresponding to each first temperature sampling point.
Further, the control unit controls the opening of the first throttling unit and/or the load loading and unloading operation of the compressor according to the temperature value before spraying and the temperature value after spraying corresponding to each first temperature sampling point specifically comprises:
the control unit calculates the absolute value of the difference between the temperature value before spraying and the temperature value after spraying of each first temperature sampling point respectively, and compares the absolute value of the difference corresponding to each first temperature sampling point with a first preset temperature difference;
and if the absolute value of the difference value between the temperature value before spraying and the temperature value after spraying of each first temperature sampling point does not exceed the first preset temperature difference value, the control unit executes the conventional control of opening of the first throttling unit and/or load loading and unloading of the compressor.
Further, if any one of the absolute values of the differences of the pre-spray temperature value and the post-spray temperature value of each first temperature sampling point exceeds a first preset temperature difference, further performing the steps of:
the control unit calculates the absolute difference values of the liquid spraying temperature values between every two first temperature sampling points respectively, and compares each group of absolute difference values with a second preset temperature difference value;
and if the absolute values of the difference values of the groups do not exceed the second preset temperature difference value, the control unit executes conventional control of opening degree of the first throttling unit and/or load loading and unloading of the compressor, otherwise, the control unit maintains the opening degree of the first throttling unit and/or the load of the compressor unchanged in the liquid spraying process.
Further, the operation of the control unit for receiving the pre-spray temperature value of each first temperature sampling point when the spray valve is closed and the post-spray temperature value when the spray valve is opened includes:
the control unit continuously receives the temperature values before spraying liquid in a plurality of unit time when the liquid spraying valve is closed and the temperature values after spraying liquid in a plurality of unit time when the liquid spraying valve is opened.
Further, before the control unit controls the opening of the first throttling unit and/or the load loading and unloading of the compressor according to the temperature value before spraying and the temperature value after spraying corresponding to each first temperature sampling point, the control unit further comprises:
the control unit respectively calculates arithmetic average values of the received temperature values before spraying and the received temperature values after spraying in a plurality of unit time, takes the arithmetic average value of the temperature values before spraying as the temperature value before spraying corresponding to the first temperature sampling point, and takes the arithmetic average value of the temperature values after spraying as the temperature value after spraying corresponding to the first temperature sampling point.
Further, a second temperature sampling point is further arranged on the refrigerant circulating flow path before the liquid homogenizing mechanism, and the liquid spraying control method of the compressor further comprises the following steps:
the control unit receives a post-spraying temperature value of the second temperature sampling point when the spraying valve is opened;
when comparing the absolute value of the difference value corresponding to each first temperature sampling point with a first preset temperature difference value, if the absolute value of the difference value of the temperature value before spraying and the temperature value after spraying of each first temperature sampling point does not exceed the first preset temperature difference value, the control unit executes the conventional control of opening of the first throttling unit and/or load loading and unloading of the compressor according to the temperature value after spraying of the second temperature sampling point;
when comparing the absolute values of the difference values of the groups with the second preset temperature difference value, if the absolute values of the difference values of the groups do not exceed the second preset temperature difference value, the control unit executes the conventional control of opening of the first throttling unit and/or load loading and unloading of the compressor according to the liquid spraying temperature value of any first temperature sampling point.
Based on the technical scheme, the liquid homogenizing mechanism is arranged in front of the air suction port of the compressor, and the refrigerant at the downstream of the outlet of the evaporator and the refrigerant from the air suction liquid spraying flow path are uniformly mixed in advance by using the liquid homogenizing mechanism so as to promote the region equalization of an air suction temperature field in front of the air suction port of the compressor, thereby reducing the possibility that a throttling unit in an air conditioning system frequently fluctuates and the compressor is frequently loaded and unloaded, and further eliminating the adverse effect of the air suction liquid spraying process of the compressor on part of the air conditioning system as much as possible.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a schematic diagram of an embodiment of an air conditioning system according to the present invention.
Fig. 2 is a schematic diagram illustrating an example of the arrangement of the first temperature sampling points in the air conditioning system according to the present invention.
Detailed Description
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Fig. 1 is a schematic diagram of an air conditioning system according to an embodiment of the present invention. In this embodiment, an air conditioning system includes: a compressor 1 for forming a refrigerant circulation path, a condenser 2, a first throttling unit 3, and an evaporator 4. A suction/spray flow path f1 for communicating with the suction port of the compressor 1 is also branched from the refrigerant circulation flow path corresponding to the refrigerant outlet pipe of the condenser 2. Taking the air-conditioning refrigerant circulation flow path shown in fig. 1 as an example, when the compressor 1 is started, the refrigerant is discharged from the exhaust port of the compressor 1, then enters the condenser 2 to exchange heat with cooling water entering from the port d, the cooling water absorbing heat is discharged from the port c, the cooling water in the condenser 2 is throttled and depressurized after being cooled and condensed by a first throttling unit 3 (such as an electronic expansion valve 3 in fig. 1) and then is conveyed into the evaporator 4 to exchange heat with the cooling water entering from the port a, the cooling water releasing heat is discharged from the port b, and the cooling water absorbing heat is conveyed to the air suction port of the compressor 1, so that a conventional cooling medium circulation process is formed. In addition to the basic elements in the air conditioning system, fig. 1 also includes other functional elements, such as stop valves 9, 11, solenoid valve 10, etc., for controlling the on/off of the refrigerant circulation.
One end of the suction liquid spray flow path f1 is provided in the refrigerant circulation flow path between the refrigerant outlet pipe of the condenser 2 and the first throttle unit 3, and the other end is provided between the suction port of the compressor 1 and the outlet of the evaporator 4. The suction liquid spray flow path f1 can reduce the discharge temperature of the compressor 1 by forming a refrigerant in a gas-liquid mixture by throttling and depressurizing a part of the refrigerant discharged from the refrigerant discharge pipe of the condenser 2 and introducing the refrigerant into the suction port of the compressor 1 together with the refrigerant discharged from the evaporator 4. In order to achieve the throttling and depressurization in the suction and spray flow path f1, a second throttling element 7 may be provided on the suction and spray flow path f1, and the throttling element may be an electronic expansion valve, a throttling orifice, a capillary tube, or the like. In addition, a drying filter can be further arranged on the refrigerant circulation flow path between the refrigerant outlet pipe of the condenser 2 and the air suction and spraying flow path f1, so as to remove impurities in the refrigerant discharged by the condenser 2 and adsorb moisture in the refrigerant, thereby ensuring the normal operation of the air conditioning system.
Referring to fig. 1, a liquid equalizing mechanism 5, such as a liquid distributor or a liquid equalizing plate with multiple holes, may be added to the air conditioning system of the present embodiment. The liquid homogenizing mechanism 5 is provided before the suction port of the compressor 1, and is configured to mix the refrigerant downstream of the outlet of the evaporator 4 and the refrigerant from the suction liquid spray path f1 uniformly in advance. The refrigerant at the downstream of the outlet of the evaporator and the refrigerant from the air suction liquid spraying flow path are uniformly mixed in advance by the liquid homogenizing mechanism, so that the region balance of an air suction temperature field before the air suction port of the compressor can be promoted, the possibility that a throttling unit in an air conditioning system frequently fluctuates and the compressor is frequently loaded and unloaded is further reduced, and the adverse effect of the air suction liquid spraying process of the compressor on the air conditioning system is eliminated as much as possible.
In order to control the on-off of the suction/spray flow path f1, a spray valve 6 may be provided in the suction/spray flow path f1 for controlling the on-off of the suction/spray flow path f1. If the air conditioning system does not require suction spray to the compressor, the suction valve 6 may be closed and when suction spray is required, the suction valve 6 may be opened. The liquid suction valve 6 can be controlled manually or automatically by using a controller, and a liquid spraying electromagnetic valve is preferably adopted as the liquid suction valve 6 correspondingly.
In order to make the temperature of the desorption gas port uniform in different regions, in fig. 1, a plurality of first temperature sampling points T1, T2, T3, T4 may be disposed on the refrigerant circulation flow path between the liquid equalizing mechanism 5 and the suction port of the compressor 1. The plurality of first temperature sampling points T1, T2, T3, T4 are at least three and are uniformly spaced along the circumferential direction of the refrigerant circulation flow path between the suction ports of the compressor 1. For example, as shown in fig. 2, four first temperature sampling points are arranged every 90 degrees in the circumferential direction of the refrigerant circulation flow path between the suction ports of the compressor 1, and the temperature of the suction ports can be measured in four directions.
For automatic control, a control unit may be added to the air conditioning system, which is capable of controlling the opening degree of the first throttle unit 3 and/or the load loading/unloading of the compressor 1 according to the received pre-spray temperature value of each of the first temperature sampling points T1, T2, T3, T4 when the spray valve 6 is closed and the post-spray temperature value when it is opened. The first throttle unit 3 is here preferably an electronic expansion valve, which is connected in communication with the control unit.
Specifically, the control unit calculates absolute value |T1 of the difference between the pre-spray temperature value and the post-spray temperature value of each of the first temperature sampling points T1, T2, T3, T4 Before spraying liquid -T1 After spraying the liquid |、|T2 Before spraying liquid -T2 After spraying the liquid |、|T3 Before spraying liquid -T3 After spraying the liquid |、|T4 Before spraying liquid -T4 After spraying the liquid And comparing the absolute values of the differences corresponding to the first temperature sampling points T1, T2, T3 and T4 with a first preset temperature difference A. If the absolute value of the difference between the temperature before spraying and the temperature after spraying of each first temperature sampling point T1, T2, T3, T4 does not exceed the first preset temperature difference, i.e. |T1 Before spraying liquid -T1 After spraying the liquid |、|T2 Before spraying liquid -T2 After spraying the liquid |、|T3 Before spraying liquid -T3 After spraying the liquid |、|T4 Before spraying liquid -T4 After spraying the liquid The values of the temperature values of a certain first temperature sampling point after spraying are used as a reference, the opening control action of the first throttling unit comprising the electronic expansion valve is judged according to the variation condition of the superheat degree of the air suction, and the load loading and unloading of the compressor is judged according to PID regulation of the target temperature of the refrigerant water outlet.
In addition, a second temperature sampling point T1a may be further provided in the refrigerant circulation flow path before the liquid equalizing mechanism 5. In the conventional control process of the control unit, the control unit is further capable of detecting a post-spray temperature value T1a of the second temperature sampling point T1a when the spray valve 6 is opened based on the received post-spray temperature value T1a After spraying the liquid Controlling the opening degree of the first throttle unit 3 and/or the load of the compressor 1And (5) loading and unloading.
If any one of the absolute difference values of the temperature values before spraying and the temperature values after spraying of the first temperature sampling points T1, T2, T3, T4 exceeds the first preset temperature difference value, i.e. |T1 Before spraying liquid -T1 After spraying the liquid |、|T2 Before spraying liquid -T2 After spraying the liquid |、|T3 Before spraying liquid -T3 After spraying the liquid |、|T4 Before spraying liquid -T4 After spraying the liquid Any one of the following>A, the following steps may be further performed:
the control unit calculates absolute difference values of the temperature values after spraying liquid between every two first temperature sampling points T1, T2, T3 and T4, namely |T1 After spraying the liquid -T2 After spraying the liquid |、|T2 After spraying the liquid -T3 After spraying the liquid |、|T3 After spraying the liquid -T4 After spraying the liquid |、|T4 After spraying the liquid -T1 After spraying the liquid |、|T1 After spraying the liquid -T3 After spraying the liquid |、|T2 After spraying the liquid -T4 After spraying the liquid And comparing the absolute values of the differences of each group with a second preset temperature difference B. If the absolute values of the differences of each group do not exceed the second preset temperature difference, i.e. |T1 After spraying the liquid -T2 After spraying the liquid |、|T2 After spraying the liquid -T3 After spraying the liquid |、|T3 After spraying the liquid -T4 After spraying the liquid |、|T4 After spraying the liquid -T1 After spraying the liquid |、|T1 After spraying the liquid -T3 After spraying the liquid |、|T2 After spraying the liquid -T4 After spraying the liquid And the opening degree of the first throttling unit 3 and/or the load loading and unloading of the compressor 1 are/is/are not equal to B, the control unit executes conventional control. For example, the temperature value of a certain first temperature sampling point after spraying liquid is taken as a reference, the opening control action of a first throttling unit comprising an electronic expansion valve is judged according to the change condition of the suction superheat degree, and the load loading and unloading of the compressor are judged according to the PID regulation of the target temperature of the refrigerant water outlet. Wherein A is>B。
If any of the absolute values of the differences exceeds a second preset temperature difference, i.e. |T1 After spraying the liquid -T2 After spraying the liquid |、|T2 After spraying the liquid -T3 After spraying the liquid |、|T3 After spraying the liquid -T4 After spraying the liquid |、|T4 After spraying the liquid -T1 After spraying the liquid |、|T1 After spraying the liquid -T3 After spraying the liquid |、|T2 After spraying the liquid -T4 After spraying the liquid Any one of the following>B, the control unit forcedly maintains the opening degree of the first throttling unit 3 unchanged, and is neither opened nor closed in the liquid spraying process; the forced control operation may be terminated after the end of the liquid spraying, while the load of the compressor 1 is forcibly maintained unchanged, and the load is not loaded or unloaded. The operation is to prevent the suction temperature sampling from changing continuously due to unbalanced temperature field, and further to cause frequent fluctuation of the electronic expansion valve that is continuously opened or closed, and continuous adjustment of the load of the compressor.
In order to show the accuracy of temperature sampling, the control unit may continuously receive the temperature values before spraying in a plurality of unit times and the temperature values after spraying in a plurality of unit times when the spraying valve 6 is closed and open when the temperature signal is received, respectively calculate arithmetic average values of the received temperature values before spraying in a plurality of unit times and the received temperature values after spraying in a plurality of unit times, and use the arithmetic average value of the temperature values before spraying as the temperature value before spraying corresponding to the first temperature sampling points T1, T2, T3, T4, and use the arithmetic average value of the temperature values after spraying as the temperature value after spraying corresponding to the first temperature sampling points T1, T2, T3, T4.
The compressor 1 in the air conditioning system can be a marine screw compressor, and correspondingly the air conditioning system is a marine air conditioning unit. Through the setting of aforesaid liquid mechanism and the control function of the control unit, can improve the unbalanced problem of marine screw compressor temperature field under the low load operating mode for marine air conditioning unit can be better satisfy lower load operating mode.
Based on the embodiments of the air conditioning system, the invention further provides a compressor spray control method, which comprises the following steps:
the control unit receives a pre-spraying liquid temperature value when the liquid spraying valve 6 is closed and a post-spraying liquid temperature value when the liquid spraying valve is opened of each first temperature sampling point T1, T2, T3 and T4;
the control unit controls the opening of the first throttling unit 3 and/or the loading and unloading of the compressor 1 according to the temperature value before spraying and the temperature value after spraying corresponding to each first temperature sampling point T1, T2, T3 and T4.
Further, the control unit controls the opening degree of the first throttling unit 3 and/or the load loading and unloading operation of the compressor 1 according to the temperature value before spraying and the temperature value after spraying corresponding to each first temperature sampling point T1, T2, T3 and T4 specifically includes:
the control unit calculates absolute values of differences between the temperature values before spraying and the temperature values after spraying of the first temperature sampling points T1, T2, T3 and T4 respectively, and compares the absolute values of differences corresponding to the first temperature sampling points T1, T2, T3 and T4 with a first preset temperature difference;
if the absolute value of the difference between the temperature value before spraying and the temperature value after spraying of each first temperature sampling point T1, T2, T3, T4 does not exceed the first preset temperature difference, the control unit performs the conventional control of opening of the first throttle unit 3 and/or load loading and unloading of the compressor 1.
In another embodiment, if any one of the absolute values of the differences of the pre-spray temperature value and the post-spray temperature value of the respective first temperature sampling points T1, T2, T3, T4 exceeds a first preset temperature difference, the following steps are further performed:
the control unit calculates the absolute value of the difference value of the temperature value after spraying liquid between every two first temperature sampling points T1, T2, T3 and T4 respectively, and compares each group of absolute value of the difference value with a second preset temperature difference value;
the control unit performs a conventional control of opening of the first throttle unit 3 and/or load loading/unloading of the compressor 1 if the absolute values of the respective sets of differences do not exceed the second preset temperature difference, otherwise the control unit maintains the opening of the first throttle unit 3 and/or the load of the compressor 1 unchanged during spraying.
In another embodiment, the operation of the control unit to receive the pre-spray temperature value when the spray valve 6 is closed and the post-spray temperature value when it is open for each of the first temperature sampling points T1, T2, T3, T4 includes: the control unit continuously receives the pre-spray temperature values of each first temperature sampling point T1, T2, T3 and T4 in a plurality of unit time when the spray valve 6 is closed and the post-spray temperature values in a plurality of unit time when the spray valve is opened.
Correspondingly, before the control unit controls the opening of the first throttling unit 3 and/or the load loading and unloading of the compressor 1 according to the pre-spraying temperature value and the post-spraying temperature value corresponding to each first temperature sampling point T1, T2, T3, T4, the method may further include: the control unit respectively calculates arithmetic average values of the received temperature values before spraying and the received temperature values after spraying in a plurality of unit time, takes the arithmetic average value of the temperature values before spraying as a temperature value before spraying corresponding to the first temperature sampling points T1, T2, T3 and T4, and takes the arithmetic average value of the temperature values after spraying as a temperature value after spraying corresponding to the first temperature sampling points T1, T2, T3 and T4.
In another embodiment, a second temperature sampling point T1a is further disposed on the refrigerant circulation flow path before the liquid homogenizing mechanism 5, and the liquid spraying control method of the compressor may further include:
the control unit receives a post-spraying temperature value of a second temperature sampling point T1a when the spraying valve 6 is opened;
when comparing the absolute values of the difference values corresponding to the first temperature sampling points T1, T2, T3 and T4 with the first preset temperature difference value, if the absolute values of the difference values of the temperature value before spraying and the temperature value after spraying of the first temperature sampling points T1, T2, T3 and T4 do not exceed the first preset temperature difference value, the control unit executes the conventional control of the opening degree of the first throttling unit 3 and/or the load loading and unloading of the compressor 1 according to the temperature value after spraying of the second temperature sampling point T1 a;
when comparing the absolute values of the difference values of the groups with the second preset temperature difference value, if the absolute values of the difference values of the groups do not exceed the second preset temperature difference value, the control unit executes the conventional control of opening degree of the first throttling unit 3 and/or load loading and unloading of the compressor 1 according to the post-spraying temperature value of any one of the first temperature sampling points T1, T2, T3 and T4.
In this specification, various embodiments are described in an incremental manner, where the emphasis of each embodiment is different, and where the same or similar parts of each embodiment are referred to each other. For the method embodiment, because the whole and the related steps have corresponding relation with the content in the system embodiment, the description is simpler, and the relevant points are only needed to be referred to in the part of the description of the system embodiment.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (11)
1. An air conditioning system, comprising: a compressor (1), a condenser (2), a first throttling unit (3) and an evaporator (4) for forming a refrigerant circulation flow path, wherein an air suction liquid spraying flow path (f 1) for communicating with an air suction port of the compressor (1) is also branched on the refrigerant circulation flow path corresponding to a refrigerant outlet pipe of the condenser (2), and the air suction liquid spraying device is characterized by further comprising a liquid homogenizing mechanism (5) arranged in front of the air suction port of the compressor (1) and used for pre-uniformly mixing the refrigerant downstream of an outlet of the evaporator (4) and the refrigerant from the air suction liquid spraying flow path (f 1); one end of the air suction liquid spraying flow path (f 1) is arranged on a refrigerant circulating flow path between a refrigerant outlet pipe of the condenser (2) and the first throttling unit (3), and the other end of the air suction liquid spraying flow path is arranged between an air suction port of the compressor (1) and an outlet of the evaporator (4);
a liquid spraying valve (6) is arranged in the air suction liquid spraying flow path (f 1) and is used for controlling the on-off of the air suction liquid spraying flow path (f 1); a plurality of first temperature sampling points (T1, T2, T3, T4) are arranged on a refrigerant circulation flow path between the liquid homogenizing mechanism (5) and the air suction port of the compressor (1), and the air conditioning system further comprises a control unit which can control the opening degree of the first throttling unit (3) and/or the load loading and unloading of the compressor (1) according to the received temperature values before spraying when the liquid spraying valve (6) is closed and the temperature values after spraying when the liquid spraying valve is opened; the plurality of first temperature sampling points (T1, T2, T3, T4) are at least three and are uniformly arranged at intervals along the circumferential direction of a refrigerant circulation flow path between the air suction ports of the compressor (1).
2. An air conditioning system according to claim 1, characterized in that the liquid-homogenizing mechanism (5) comprises a liquid-dispenser or a liquid-homogenizing plate with multiple holes.
3. Air conditioning system according to claim 1, characterized in that a second temperature sampling point (T1 a) is further arranged on the refrigerant circulation flow path before the liquid homogenizing mechanism (5), and the control unit is further capable of controlling the opening degree of the first throttling unit (3) and/or the load loading and unloading of the compressor (1) according to the received post-spraying temperature value of the second temperature sampling point (T1 a) when the spraying valve (6) is opened.
4. An air conditioning system according to claim 1, characterized in that the first throttle unit (3) comprises an electronic expansion valve, the hydrojet valve (6) comprises a hydrojet solenoid valve, both of which are communicatively connected to the control unit.
5. An air conditioning system according to any of claims 1-4, characterized in that the compressor (1) is a marine screw compressor and the air conditioning system is a marine air conditioning unit.
6. A compressor spray control method based on the air conditioning system according to any one of claims 1 to 5, characterized by comprising:
the control unit receives a pre-spray temperature value of each first temperature sampling point (T1, T2, T3, T4) when the spray valve (6) is closed and a post-spray temperature value when the spray valve is opened;
the control unit controls the opening degree of the first throttling unit (3) and/or the load loading and unloading of the compressor (1) according to the temperature value before spraying and the temperature value after spraying corresponding to each first temperature sampling point (T1, T2, T3 and T4).
7. The compressor spray control method according to claim 6, wherein the control unit controls the opening degree of the first throttle unit (3) and/or the load loading/unloading operation of the compressor (1) according to the pre-spray temperature value and the post-spray temperature value corresponding to each first temperature sampling point (T1, T2, T3, T4) specifically comprises:
the control unit calculates the absolute value of the difference between the temperature value before spraying and the temperature value after spraying of each first temperature sampling point (T1, T2, T3, T4) respectively, and compares the absolute value of the difference corresponding to each first temperature sampling point (T1, T2, T3, T4) with a first preset temperature difference;
if the absolute value of the difference between the pre-spray temperature value and the post-spray temperature value of each first temperature sampling point (T1, T2, T3, T4) does not exceed a first preset temperature difference, the control unit performs conventional control of the opening of the first throttling unit (3) and/or the load loading and unloading of the compressor (1).
8. The compressor spray control method according to claim 7, wherein if any one of absolute values of differences of pre-spray temperature values and post-spray temperature values of the respective first temperature sampling points (T1, T2, T3, T4) exceeds a first preset temperature difference, the following steps are further performed:
the control unit calculates the absolute difference values of the liquid spraying temperature values between every two first temperature sampling points (T1, T2, T3 and T4) respectively, and compares each group of absolute difference values with a second preset temperature difference value;
and if the absolute values of the difference values of the groups do not exceed the second preset temperature difference value, the control unit executes conventional control of opening degree of the first throttling unit (3) and/or load loading and unloading of the compressor (1), otherwise, the control unit maintains the opening degree of the first throttling unit (3) and/or the load of the compressor (1) unchanged in the spraying process.
9. The compressor spray control method according to claim 6, wherein the operation of the control unit receiving the pre-spray temperature value at the time of closing the spray valve (6) and the post-spray temperature value at the time of opening the respective first temperature sampling points (T1, T2, T3, T4) includes:
the control unit continuously receives the pre-spraying temperature values of each first temperature sampling point (T1, T2, T3, T4) in a plurality of unit time when the spraying valve (6) is closed and the post-spraying temperature values in a plurality of unit time when the spraying valve is opened.
10. The compressor spray control method according to claim 9, characterized in that before the control unit controls the opening degree of the first throttle unit (3) and/or the load loading/unloading of the compressor (1) according to the pre-spray temperature value and the post-spray temperature value corresponding to the respective first temperature sampling points (T1, T2, T3, T4), further comprising:
the control unit respectively calculates arithmetic average values of the received temperature values before spraying and the received temperature values after spraying in a plurality of unit time, takes the arithmetic average value of the temperature values before spraying as the temperature value before spraying corresponding to the first temperature sampling points (T1, T2, T3 and T4), and takes the arithmetic average value of the temperature values after spraying as the temperature value after spraying corresponding to the first temperature sampling points (T1, T2, T3 and T4).
11. The compressor spray control method according to claim 8, characterized in that a second temperature sampling point (T1 a) is further provided on the refrigerant circulation flow path before the liquid equalizing mechanism (5), the compressor spray control method further comprising:
the control unit receives a post-spraying temperature value of a second temperature sampling point (T1 a) when the spraying valve (6) is opened;
when comparing the absolute value of the difference corresponding to each first temperature sampling point (T1, T2, T3, T4) with a first preset temperature difference value, if the absolute value of the difference between the pre-spraying temperature value and the post-spraying temperature value of each first temperature sampling point (T1, T2, T3, T4) does not exceed the first preset temperature difference value, the control unit executes the conventional control of the opening degree of the first throttling unit (3) and/or the load loading and unloading of the compressor (1) according to the post-spraying temperature value of the second temperature sampling point (T1 a);
when comparing the absolute values of the difference values of the groups with the second preset temperature difference value, if the absolute values of the difference values of the groups do not exceed the second preset temperature difference value, the control unit executes the conventional control of opening degree of the first throttling unit (3) and/or load loading and unloading of the compressor (1) according to the temperature value after spraying of any one of the first temperature sampling points (T1, T2, T3 and T4).
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| CN101858706A (en) * | 2010-07-01 | 2010-10-13 | 杭州沈氏换热器有限公司 | Liquid separating device |
| CN202371820U (en) * | 2011-12-23 | 2012-08-08 | 珠海格力电器股份有限公司 | Air conditioner |
| JP2015014372A (en) * | 2013-07-03 | 2015-01-22 | 日立アプライアンス株式会社 | Air conditioner |
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| CN207095074U (en) * | 2017-07-31 | 2018-03-13 | 珠海格力电器股份有限公司 | Air-conditioning system |
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| CN101858706A (en) * | 2010-07-01 | 2010-10-13 | 杭州沈氏换热器有限公司 | Liquid separating device |
| CN202371820U (en) * | 2011-12-23 | 2012-08-08 | 珠海格力电器股份有限公司 | Air conditioner |
| JP2015014372A (en) * | 2013-07-03 | 2015-01-22 | 日立アプライアンス株式会社 | Air conditioner |
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| CN207095074U (en) * | 2017-07-31 | 2018-03-13 | 珠海格力电器股份有限公司 | Air-conditioning system |
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