CN112097424A - Refrigerating system, air supply control method and device and air conditioning equipment - Google Patents

Refrigerating system, air supply control method and device and air conditioning equipment Download PDF

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Publication number
CN112097424A
CN112097424A CN202010981454.7A CN202010981454A CN112097424A CN 112097424 A CN112097424 A CN 112097424A CN 202010981454 A CN202010981454 A CN 202010981454A CN 112097424 A CN112097424 A CN 112097424A
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China
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economizer
liquid level
throttling element
opening degree
valve
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CN112097424B (en
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周宇
谢振林
刘贤权
柯廷芬
钟瑞兴
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • 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
    • 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)

Abstract

The invention discloses a refrigeration system, an air supply control method and device and air conditioning equipment. Wherein, this refrigerating system includes: a compressor, a condenser, an evaporator, a first economizer, and a second economizer; the first economizer and the second economizer are connected in parallel between the condenser and the evaporator; the first economizer and the second economizer are both connected to a make-up port of the compressor; and a first throttling element is arranged on a connecting pipeline between the second economizer and the condenser, a second throttling element is arranged on a connecting pipeline between the second economizer and the evaporator, and the opening degrees of the first throttling element and the second throttling element are adjustable. According to the invention, the first economizer and the second economizer form a two-way air supplementing structure, and the liquid level heights in the first economizer and the second economizer can be controlled through the first throttling element and the second throttling element with adjustable opening degrees, so that the pressure in the economizers is controlled to be at a proper air supplementing pressure, the effective control of air supplementing quantity is realized, and the unit energy efficiency is improved.

Description

Refrigerating system, air supply control method and device and air conditioning equipment
Technical Field
The invention relates to the technical field of units, in particular to a refrigerating system, an air supplement control method and device and air conditioning equipment.
Background
In the modern society advocating energy conservation and environmental protection, the centrifugal water chilling unit is used as the most ideal refrigeration equipment for large buildings, and the energy efficiency of the centrifugal water chilling unit becomes the most key performance index. The double-stage compression is a refrigeration cycle commonly adopted by the existing centrifugal water chilling unit, and the inlet temperature of the second-stage compression is reduced by utilizing a middle air supply mode, so that the power consumption of the second-stage compression is reduced, and the refrigerating capacity and the energy efficiency of the unit are improved. The air supplement amount is of great importance to the whole refrigeration cycle, and the reasonable air supplement amount is beneficial to improving the energy efficiency ratio of the water chilling unit.
At present, a centrifugal water chilling unit adopting double-stage compression only has one economizer, and the air supplement amount is basically uncontrollable, so that the condition that the energy efficiency of the unit is reduced due to the fact that the air supplement amount is not appropriate under the changing working condition can be caused.
Disclosure of Invention
The embodiment of the invention provides a refrigeration system, an air supplement control method and device and air conditioning equipment, and at least solves the problem that the energy efficiency of a unit is reduced due to the fact that the air supplement amount cannot be effectively controlled in the prior art.
To solve the above technical problem, an embodiment of the present invention provides a refrigeration system, including: compressor, condenser and evaporimeter, refrigerating system still includes: a first economizer and a second economizer;
the first economizer and the second economizer are connected in parallel between the condenser and the evaporator;
the first economizer and the second economizer are both connected to a make-up port of the compressor;
and a first throttling element is arranged on a connecting pipeline between the second economizer and the condenser, and a second throttling element is arranged on a connecting pipeline between the second economizer and the evaporator, wherein the opening degrees of the first throttling element and the second throttling element are adjustable.
Optionally, the refrigeration system further comprises: a third throttling element and a fourth throttling element, wherein the opening degrees of the third throttling element and the fourth throttling element are fixed;
one end of the third throttling element is connected to the first liquid outlet of the condenser, and the other end of the third throttling element is connected to the liquid inlet of the first economizer;
one end of the fourth throttling element is connected to the liquid outlet of the first evaporator, and the other end of the fourth throttling element is connected to the first liquid inlet of the evaporator;
the air outlet of the first economizer is connected to the first air supplement port.
Optionally, the third throttling element is an orifice plate, and/or the fourth throttling element is an orifice plate.
Optionally, a first valve is arranged on a connecting pipeline between the first economizer and the first air supplementing port.
Optionally, the liquid inlet of the second economizer is connected to the second liquid outlet of the condenser through the first throttling element, the liquid outlet of the second economizer is connected to the second liquid inlet of the evaporator through the second throttling element, and the gas outlet of the second economizer is connected to the second gas supplementing port.
Optionally, the first throttling element is an electronic expansion valve, and/or the second throttling element is an electronic expansion valve, and/or a first liquid level sensor is arranged in the first economizer, and/or a second liquid level sensor is arranged in the second economizer.
Optionally, a second valve is arranged on a connecting pipeline between the second economizer and the second air supplementing port.
Optionally, the volume of the first economizer is larger than the volume of the second economizer.
The embodiment of the invention also provides a gas supplementing control method, which is applied to the refrigeration system in the embodiment of the invention and comprises the following steps:
acquiring a liquid level in a first economizer during operation of the refrigeration system;
judging whether the liquid level in the first economizer is within a first preset liquid level range or not;
and if not, controlling a first throttling element and a second throttling element according to the relation between the liquid level in the first economizer and the first preset liquid level range so as to adjust the liquid level in the first economizer.
Optionally, controlling the first throttling element and the second throttling element according to the relation between the liquid level in the first economizer and the first preset liquid level range comprises:
if the liquid level in the first economizer is lower than the lower limit of the first preset liquid level range, reducing the opening degree of the first throttling element until the liquid level in the first economizer is in the first preset liquid level range or the opening degree of the first throttling element reaches the minimum opening degree;
and if the liquid level in the first economizer is higher than the upper limit of the first preset liquid level range, increasing the opening degree of the first throttling element, and simultaneously increasing the opening degree of the second throttling element until the liquid level in the first economizer is in the first preset liquid level range or the opening degrees of the first throttling element and the second throttling element reach the maximum opening degree.
Optionally, the method further includes:
if the opening degree of the first throttling element reaches the minimum opening degree, but the liquid level in the first economizer is still lower than the lower limit of the first preset liquid level range, or if the opening degrees of the first throttling element and the second throttling element both reach the maximum opening degree, but the liquid level in the first economizer is still higher than the upper limit of the first preset liquid level range, closing the first valve and opening the second valve;
wherein the first valve is located on a connecting line between the first economizer and a first air supplement port of a compressor, and the second valve is located on a connecting line between a second economizer and a second air supplement port of the compressor.
Optionally, the method further includes:
if the opening degree of the first throttling element reaches the minimum opening degree, but the liquid level in the first economizer is still lower than the lower limit of the first preset liquid level range and continuously exceeds a first preset time length, or if the opening degrees of the first throttling element and the second throttling element both reach the maximum opening degree, but the liquid level in the first economizer is still higher than the upper limit of the first preset liquid level range and continuously exceeds the first preset time length, closing the first valve and opening the second valve;
wherein the first valve is located on a connecting line between the first economizer and a first air supplement port of a compressor, and the second valve is located on a connecting line between a second economizer and a second air supplement port of the compressor.
Optionally, after determining whether the liquid level in the first economizer is within a first preset liquid level range, the method further includes: and if so, controlling the first throttling element and the second throttling element to maintain the current opening degree unchanged.
Optionally, after the first valve is closed and the second valve is opened, the method further includes:
acquiring a liquid level in the second economizer;
judging whether the liquid level in the second economizer is within a second preset liquid level range or not;
if not, controlling the first throttling element and the second throttling element according to the relation between the liquid level in the second economizer and the second preset liquid level range so as to adjust the liquid level in the second economizer.
Optionally, after determining whether the liquid level in the second economizer is within a second preset liquid level range, the method further includes: and if so, controlling the first throttling element and the second throttling element to maintain the current opening degree unchanged.
Optionally, controlling the first throttling element and the second throttling element according to a relation between a liquid level in the second economizer and the second preset liquid level range includes:
and if the liquid level in the second economizer is lower than the lower limit of the second preset liquid level range, increasing the opening degree of the first throttling element until the liquid level in the second economizer is in the second preset liquid level range or the opening degree of the first throttling element reaches the maximum opening degree.
Optionally, if the opening degree of the first throttling element reaches the maximum opening degree, but the liquid level in the second economizer is still lower than the lower limit of the second preset liquid level range, the opening degree of the second throttling element is reduced until the liquid level in the second economizer is within the second preset liquid level range.
Optionally, controlling the first throttling element and the second throttling element according to a relation between a liquid level in the second economizer and the second preset liquid level range includes:
and if the liquid level in the second economizer is higher than the upper limit of the second preset liquid level range, increasing the opening degree of the second throttling element until the liquid level in the second economizer is in the second preset liquid level range or the opening degree of the second throttling element reaches the maximum opening degree.
Optionally, if the opening degree of the second throttling element reaches the maximum opening degree, but the liquid level in the second economizer is still higher than the upper limit of the second preset liquid level range, the opening degree of the first throttling element is reduced until the liquid level in the second economizer is within the second preset liquid level range.
Optionally, after the first valve is closed and the second valve is opened, the method further includes: and if the liquid level in the first economizer is detected to be within the first preset liquid level range, closing the second valve and opening the first valve.
Optionally, the method further includes:
when the refrigeration system is in a starting state or a shutdown state, controlling a first valve and a second valve to be in a closing state, and controlling a first throttling element and a second throttling element to be in a maximum opening degree;
after the starting process is finished, controlling the first throttling element to recover to a first initial opening degree, controlling the second throttling element to recover to a second initial opening degree, opening the first valve, and controlling the second valve to be still in a closed state;
wherein the first valve is located on a connecting line between the first economizer and a first air supplement port of a compressor, and the second valve is located on a connecting line between a second economizer and a second air supplement port of the compressor.
The embodiment of the invention also provides a gas supplementing control device, which is applied to the refrigeration system in the embodiment of the invention and comprises the following components:
the first acquisition module is used for acquiring the liquid level in the first economizer in the operation process of the refrigeration system;
the first judgment module is used for judging whether the liquid level in the first economic device is within a first preset liquid level range or not;
the first control module is used for controlling the first throttling element and the second throttling element according to the relation between the liquid level in the first economizer and the first preset liquid level range to adjust the liquid level in the first economizer if the liquid level in the first economizer is not in the first preset liquid level range.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, and the program is executed by a processor to implement the gas compensation control method according to the embodiment of the invention.
An embodiment of the present invention further provides an air conditioning apparatus, including: the refrigeration system provided by the embodiment of the invention.
By applying the technical scheme of the invention, a two-way air supplementing structure is formed by the first economizer and the second economizer, the liquid level heights in the first economizer and the second economizer can be controlled by the first throttling element and the second throttling element with adjustable opening degrees so as to control the pressures in the first economizer and the second economizer, when the liquid level height in the economizer is in the corresponding optimal liquid level range, the pressure in the economizer is in the appropriate air supplementing pressure, the compressor can be effectively supplemented with air, the gas backflow and air supplementing liquid carrying are avoided, and therefore, the effective control of air supplementing quantity can be realized and the unit energy efficiency is improved by controlling the liquid level height in the economizer to be maintained in the optimal liquid level range.
Drawings
Fig. 1 is a schematic structural diagram of a refrigeration system according to a first embodiment of the present invention;
FIG. 2 is another schematic diagram of a refrigeration system according to an embodiment of the present invention
FIG. 3 is a flowchart illustrating a method for controlling gas supply according to a second embodiment of the present invention;
fig. 4 is a block diagram of a gas compensation control device according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
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 different than presented herein.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example one
The embodiment provides a refrigerating system, realizes the effective control of air supplement volume through two way tonifying qi, and then promotes the unit efficiency. Fig. 1 is a schematic structural diagram of a refrigeration system according to a first embodiment of the present invention, and as shown in fig. 1, the refrigeration system includes: a compressor 1, a condenser 2, an evaporator 3, a first economizer 4, and a second economizer 5.
The first economizer 4 and the second economizer 5 are connected in parallel between the condenser 2 and the evaporator 3; the first economizer 4 and the second economizer 5 are both connected to the make-up port of the compressor 1. Two paths of air supply structures are formed by the first economizer and the second economizer. Specifically, the first economizer 4 and the second economizer 5 may be connected to the compressor through the same air supplement port, or may be connected to the compressor through different air supplement ports, and fig. 1 illustrates an example in which the first economizer 4 is connected to the first air supplement port L of the compressor 1, and the second economizer 5 is connected to the second air supplement port N of the compressor 1.
A first throttling element 51 is arranged on a connecting pipeline between the second economizer 5 and the condenser 2, and a second throttling element 52 is arranged on a connecting pipeline between the second economizer 5 and the evaporator 3, wherein the opening degrees of the first throttling element 51 and the second throttling element 52 are adjustable.
The liquid level in the economizer is positively correlated with the pressure in the economizer, the higher the liquid level, the higher the pressure, and the lower the liquid level, the lower the pressure. The pressure in the economizer determines the air supply effect, and when the pressure in the economizer is lower than the theoretical intermediate pressure of a refrigeration system, the situation of air supply failure and even gas backflow can be caused. When the liquid level in the economizer is too high and the pressure is too high, the air is supplemented with liquid, and the compressor can be damaged. The circulation volume of the refrigerant of the refrigerating system under the stable working condition is fixed, and the refrigerant enters the evaporator from the condenser in only two ways: the refrigerant quantity of the path entering the second economizer is reduced, and the refrigerant quantity of the path entering the first economizer is correspondingly increased.
In this embodiment, the opening degrees of the first throttling element and the second throttling element are adjustable, so that the amount of refrigerant entering the second economizer can be changed by adjusting the opening degrees of the first throttling element and the second throttling element, and the liquid level height in the second economizer can be controlled, and the liquid level height in the first economizer can also be indirectly controlled. Through carrying out liquid level control to the economic ware to pressure in the control economic ware, pressure in the economic ware is in suitable tonifying qi pressure, can effectively carry out the tonifying qi to the compressor, avoids gas refluence and tonifying qi to take liquid, and the liquid level through in the control economic ware is in suitable scope from this, alright reach the effect of control tonifying qi volume.
This embodiment constitutes two way tonifying qi structures through first economic ware and second economic ware, through first throttling element and the second throttling element of aperture adjustable, can control the liquid level height in first economic ware and the second economic ware, with the pressure in first economic ware of control and the second economic ware, when the liquid level height in the economic ware is in the best liquid level scope that corresponds, pressure in the economic ware is in suitable tonifying qi pressure, can effectively supply qi to the compressor, avoid gas refluence and tonifying qi to bring liquid, from this the liquid level height through in the control economic ware maintains at best liquid level scope, alright realize the effective control of tonifying qi volume, promote the unit efficiency.
The first throttling element and the second throttling element are adjustable-opening throttling elements, preferably, the first throttling element can be an electronic expansion valve, and/or the second throttling element can be an electronic expansion valve.
Referring to fig. 2, the refrigeration system may further include: a third throttling element 41 and a fourth throttling element 42, the opening degrees of the third throttling element 41 and the fourth throttling element 42 being fixed. The third throttling element and the fourth throttling element may be capillary tubes, orifice plates, or other throttling elements with adjustable opening degrees, but the opening degrees of the throttling elements are fixed at a certain opening degree value and are kept unchanged. Preferably, the third throttling element is an orifice plate, and/or the fourth throttling element is an orifice plate.
One end of the third throttling element 41 is connected to the first liquid outlet a of the condenser 2, and the other end is connected to the liquid inlet K of the first economizer 4; one end of the fourth throttling element 42 is connected to the liquid outlet I of the first economizer 4, and the other end is connected to the first liquid inlet H of the evaporator 3; the air outlet J of the first economizer 4 is connected to the first air supplement port L. Through the concrete connection, the refrigerant flowing out of the condenser can be ensured to supplement air to the compressor through the first economizer, and enters the evaporator to realize refrigeration cycle.
Optionally, a first valve 43 is disposed on a connection pipeline between the first economizer 4 and the first air supplement port L. The first valve 43 may be a solenoid valve. The first economizer can be started or stopped to supplement air to the compressor through the opening and closing of the first valve 43.
The liquid inlet C of the second economizer 5 is connected to the second liquid outlet B of the condenser 2 through the first throttling element 51, the liquid outlet E of the second economizer 5 is connected to the second liquid inlet F of the evaporator 3 through the second throttling element 52, and the gas outlet D of the second economizer 5 is connected to the second gas supplementing port N. Through the specific connection, the refrigerant flowing out of the condenser can be enabled to supplement air to the compressor through the second economizer, and enters the evaporator to realize refrigeration cycle.
Optionally, a second valve 53 is disposed on a connection pipeline between the second economizer 5 and the second air supplement port N. The second valve 53 may be a solenoid valve. The second economizer can be started or stopped to supplement air to the compressor by opening or closing the second valve 53.
The first economizer and the second economizer may be open economizers. Considering that the first economizer mainly performs air supplement and the second economizer secondarily performs air supplement, the volume of the first economizer can be set to be larger than that of the second economizer. The specific volume proportion can be determined according to the flow rate proportion of the two air supply pipelines. The flow rate ratio can be determined by the designer or the producer as required during the design or production of the plant, for example, setting the flow rate ratio to 5: 3, the volume ratio of the corresponding first economizer to the second economizer can be 5: 3, the larger the flow of the air supplementing pipeline in which the second economizer is positioned, the larger the adjustable amplitude of the liquid level heights in the first economizer and the second economizer through the first throttling element and the second throttling element is, and the stronger the capacity of the refrigerating system for adapting to the changing working conditions is.
A first liquid level sensor can be arranged in the first economizer and used for detecting the liquid level in the first economizer so as to control the air supplement amount based on the liquid level. And a second liquid level sensor can be arranged in the second economizer and used for detecting the liquid level in the second economizer so as to control the gas supplementing amount based on the liquid level.
The refrigerating system shown in fig. 2 includes two air make-up circuits, two throttling elements (such as throttling orifice plates) with fixed opening degrees and two throttling elements (such as electronic expansion valves) with adjustable opening degrees are adopted, two economizers with one large economizer and one small economizer are configured in the throttling mode, two-way two-stage throttling is achieved, the air make-up quantity can be effectively controlled, and the unit energy efficiency is improved.
The refrigeration system according to the embodiment of the present invention may be a centrifugal chiller, and correspondingly, the compressor 1 may be a centrifugal two-stage compressor, and includes an air suction port O, an air discharge port M, a first air supplement port L, and a second air supplement port N. The exhaust port M is connected to the air inlet P of the condenser 2, and the air inlet O is connected to the air outlet G of the evaporator 3. The first and second air supplement ports L and N are opened between the first-stage compression and the second-stage compression. The refrigeration system may further include a controller configured to receive analog signals from the first level sensor, the second level sensor, the first throttling element, and the second throttling element, and output signals to control the opening of the first throttling element and the second throttling element.
Example two
The embodiment provides a gas compensation control method, which is applied to the refrigeration system in the embodiment. Fig. 3 is a flowchart of a gas compensation control method according to a second embodiment of the present invention, as shown in fig. 3, the method includes the following steps:
s301, in the operation process of the refrigerating system, the liquid level in the first economizer is obtained.
S302, judging whether the liquid level in the first economizer is within a first preset liquid level range.
S303, if not, controlling a first throttling element and a second throttling element according to the relation between the liquid level in the first economizer and the first preset liquid level range so as to adjust the liquid level in the first economizer. And if so, controlling the first throttling element and the second throttling element to maintain the current opening degree unchanged.
The liquid level in the economizer is positively correlated with the pressure in the economizer, the higher the liquid level, the higher the pressure, and the lower the liquid level, the lower the pressure. The pressure in the economizer determines the air supply effect, and when the pressure in the economizer is lower than the theoretical intermediate pressure of a refrigeration system, the situation of air supply failure and even gas backflow can be caused. When the liquid level in the economizer is too high and the pressure is too high, the air is supplemented with liquid, and the compressor can be damaged. The first preset liquid level range in this embodiment is an optimal liquid level range in which the first economizer can normally supply air to the compressor, and can be set based on actual test data. The liquid level in the first economizer is in a first preset liquid level range, and therefore air supply failure cannot occur, and air supply liquid carrying cannot be caused. The liquid level in the first economizer may be detected, in particular, by a first liquid level sensor in the first economizer.
The circulation volume of the refrigerant of the refrigerating system under the stable working condition is fixed, and the refrigerant enters the evaporator from the condenser in only two ways: the refrigerant quantity of the path entering the second economizer is reduced, and the refrigerant quantity of the path entering the first economizer is correspondingly increased. Therefore, the refrigerant quantity entering the second economizer can be changed by adjusting the opening degrees of the first throttling element and the second throttling element, so that the liquid level height in the first economizer is indirectly controlled.
In the embodiment, in the operation process of the refrigeration system, the liquid level in the first economizer is obtained, and if the liquid level in the first economizer is not within the first preset liquid level range, the first throttling element and the second throttling element are controlled according to the relation between the liquid level in the first economizer and the first preset liquid level range so as to adjust the liquid level in the first economizer and enable the liquid level in the first economizer to return to the first preset liquid level range. Through the liquid level in the control first economic ware for the liquid level in the first economic ware is in optimum liquid level scope, and the pressure in the corresponding first economic ware maintains at suitable tonifying qi pressure, carries out effective tonifying qi to the compressor, reaches the effect of control tonifying qi volume, realizes the effective control of tonifying qi volume, promotes the unit efficiency.
In one embodiment, S303 controls a first throttling element and a second throttling element according to a relationship between a liquid level in the first economizer and the first preset liquid level range, including:
if the liquid level in the first economizer is lower than the lower limit of the first preset liquid level range, reducing the opening degree of the first throttling element until the liquid level in the first economizer is in the first preset liquid level range or the opening degree of the first throttling element reaches the minimum opening degree; in this case, the control of the second restriction element may be: controlling the second throttling element to maintain the current opening degree of the second throttling element unchanged, or maintain the current opening degree of the second throttling element at a second initial opening degree corresponding to the current opening degree, or appropriately reduce or increase the opening degree;
and if the liquid level in the first economizer is higher than the upper limit of the first preset liquid level range, increasing the opening degree of the first throttling element, and simultaneously increasing the opening degree of the second throttling element until the liquid level in the first economizer is in the first preset liquid level range or the opening degrees of the first throttling element and the second throttling element reach the maximum opening degree.
The refrigerant flow rate of the inlet of the second economizer is reduced by closing the first throttling element, accordingly, the refrigerant flow rate flowing to the first economizer is increased, and the opening degrees of the third throttling element and the fourth throttling element on the side of the first economizer are fixed (for example, the hole diameter of the throttling orifice plate is fixed), so that the liquid level in the first economizer naturally rises. By simultaneously opening the first throttling element and the second throttling element, the flow of the refrigerant flowing to the second economizer can be increased, correspondingly, the flow of the refrigerant flowing to the first economizer can be reduced, and the liquid level in the first economizer can also be reduced.
The first throttling element and the second throttling element can be set with corresponding initial opening degrees, specifically, a first initial opening degree of the first throttling element and a second initial opening degree of the second throttling element can be determined according to the distributed flow rate of the second economizer, and the first initial opening degree and the second initial opening degree can be generally determined according to the opening degree of about 20% -50%, so that enough adjustment allowance is guaranteed. The minimum opening of the throttling element is typically 0 and the maximum opening may be determined based on the particular throttling element configuration.
In the embodiment, when the liquid level in the first economizer deviates from the corresponding optimal liquid level range, the liquid level in the first economizer is preferentially controlled by controlling the opening degrees of the first throttling element and the second throttling element so as to control the air supplementing pressure and ensure the stable air supplementing amount.
In this embodiment, the opening degree of the throttling element may be adjusted (increased or decreased) step by step according to a preset number of steps, or may be adjusted according to a changed number of steps, which is not limited in this embodiment.
Further, the method further comprises: if the opening degree of the first throttling element reaches the minimum opening degree, but the liquid level in the first economizer is still lower than the lower limit of the first preset liquid level range, or if the opening degrees of the first throttling element and the second throttling element both reach the maximum opening degree, but the liquid level in the first economizer is still higher than the upper limit of the first preset liquid level range, closing the first valve and opening the second valve. Wherein the first valve is located on a connecting line between the first economizer and a first air supplement port of a compressor, and the second valve is located on a connecting line between a second economizer and a second air supplement port of the compressor.
This embodiment is under the condition that can not adjust the liquid level in the first economic ware to first preset liquid level within range through adjusting first throttling element and second throttling element, do not reach ideal liquid level adjustment effect to first economic ware promptly, can't use first economic ware to carry out normal tonifying qi, for avoiding influencing the unit operation, can close first valve and open the second valve this moment, in order to carry out the tonifying qi through the second economic ware, the liquid level of second economic ware is controlled to specific accessible first throttling element and second throttling element, guarantee that the system has certain tonifying qi volume, improve complete machine efficiency.
In order to further ensure the accuracy of the air supply control, a preset time period can be set. Specifically, if the opening degree of the first throttling element reaches the minimum opening degree, but the liquid level in the first economizer is still lower than the lower limit of the first preset liquid level range and continuously exceeds a first preset time, or if the opening degrees of the first throttling element and the second throttling element both reach the maximum opening degree, but the liquid level in the first economizer is still higher than the upper limit of the first preset liquid level range and continuously exceeds the first preset time, the first valve is closed, and the second valve is opened. The first preset time period may be preset according to an actual control requirement, for example, set to 5 min.
In this embodiment, when it is found that the liquid level in the first economizer cannot be adjusted to the first preset liquid level range by adjusting the first throttling element and the second throttling element, the control of the valve is not immediately executed to replenish the gas by the second economizer, but the gas is replenished by the second economizer only when the duration of the state that the liquid level in the first economizer is not in the first preset liquid level range reaches the first preset duration through the first preset duration, so that misoperation caused by slow feedback of the system or the sensor can be avoided, and the accuracy and reliability of gas replenishment control are further improved.
The liquid level control of the second economizer is explained below.
Because the throttling element with adjustable opening degree is connected in series in front of and behind the second economizer, the liquid level in the second economizer is easier to control than that in the first economizer. The liquid level in the second economizer can be increased by opening the first throttling element and/or closing the second throttling element; by closing the first throttle element down and/or opening the second throttle element up, the liquid level in the second economizer can be lowered.
Specifically, after the first valve is closed and the second valve is opened, the method further includes: acquiring a liquid level in the second economizer; judging whether the liquid level in the second economizer is within a second preset liquid level range or not; if not, controlling the first throttling element and the second throttling element according to the relation between the liquid level in the second economizer and the second preset liquid level range so as to adjust the liquid level in the second economizer; and if so, controlling the first throttling element and the second throttling element to maintain the current opening degree unchanged.
The second preset liquid level range is the optimal liquid level range within which the second economizer can normally supplement air to the compressor, and can be set based on actual test data. The liquid level in the second economizer is in a second preset liquid level range, and therefore air supplement failure cannot occur, and air supplement liquid carrying cannot be caused. The level of the liquid in the second economizer may specifically be detected by a second level sensor in the second economizer.
In the operation process of the refrigerating system, when air supplement is carried out through the second economizer, if the liquid level in the second economizer deviates from the second preset liquid level range, the first throttling element and the second throttling element are controlled to adjust the liquid level in the second economizer so that the liquid level in the second economizer returns to the second preset liquid level range, the air supplement amount is effectively controlled, and the unit energy efficiency is improved.
In an alternative embodiment, controlling the first throttling element and the second throttling element according to the relationship of the liquid level in the second economizer to the second preset liquid level range comprises: and if the liquid level in the second economizer is lower than the lower limit of the second preset liquid level range, increasing the opening degree of the first throttling element until the liquid level in the second economizer is in the second preset liquid level range or the opening degree of the first throttling element reaches the maximum opening degree. In this case, the control of the second restriction element may be: controlling the second throttling element to maintain the current opening degree of the second throttling element unchanged, or maintain the current opening degree of the second throttling element at a second initial opening degree corresponding to the current opening degree, or appropriately reduce the opening degree;
in the embodiment, under the condition that the liquid level in the second economizer is lower than the lower limit of the second preset liquid level range, the liquid level in the second economizer is preferentially improved by increasing the opening degree of the first throttling element so as to control the air supplementing pressure and ensure the stable air supplementing amount.
Further, if the opening degree of the first throttling element reaches the maximum opening degree, but the liquid level in the second economizer is still lower than the lower limit of the second preset liquid level range, the opening degree of the second throttling element is reduced until the liquid level in the second economizer is within the second preset liquid level range. Under the condition that the liquid level in the second economizer cannot return to the second preset liquid level range by increasing the opening degree of the first throttling element, the opening degree of the second throttling element is reduced to continue adjusting the liquid level in the second economizer so as to reach the optimal liquid level range and ensure effective air supplement.
In an alternative embodiment, controlling the first throttling element and the second throttling element according to the relationship of the liquid level in the second economizer to the second preset liquid level range comprises: and if the liquid level in the second economizer is higher than the upper limit of the second preset liquid level range, increasing the opening degree of the second throttling element until the liquid level in the second economizer is in the second preset liquid level range or the opening degree of the second throttling element reaches the maximum opening degree. In this case, the control of the first throttling element may be: controlling the first throttling element to maintain the current opening degree of the first throttling element unchanged, or maintain the current opening degree of the first throttling element at a first initial opening degree corresponding to the current opening degree, or appropriately reduce the opening degree;
in the embodiment, under the condition that the liquid level in the second economizer is higher than the upper limit of the second preset liquid level range, the liquid level in the second economizer is reduced by preferentially increasing the opening degree of the second throttling element so as to control the air supplementing pressure and ensure the stable air supplementing amount.
Further, if the opening degree of the second throttling element reaches the maximum opening degree, but the liquid level in the second economizer is still higher than the upper limit of the second preset liquid level range, the opening degree of the first throttling element is reduced until the liquid level in the second economizer is within the second preset liquid level range.
Under the condition that the liquid level in the second economizer cannot return to the second preset liquid level range by increasing the opening degree of the second throttling element, the opening degree of the first throttling element is reduced to continue adjusting the liquid level in the second economizer so as to reach the optimal liquid level range and ensure effective air supplement.
In an alternative embodiment, after closing the first valve and opening the second valve, the method may further comprise: and if the liquid level in the first economizer is detected to be within the first preset liquid level range, closing the second valve and opening the first valve.
When the working condition of the unit changes to cause the liquid level in the first economizer to return to the first preset liquid level range, the second valve is closed and the first valve is opened, the first economizer is switched to supplement air, and the liquid level in the first economizer is controlled. This embodiment can in time resume and carry out the tonifying qi by the great first economic ware of volume, guarantees to have stable tonifying qi volume.
In an optional embodiment, the method further comprises: when the refrigeration system is in a starting state or a shutdown state, controlling a first valve and a second valve to be in a closing state, and controlling a first throttling element and a second throttling element to be in a maximum opening degree; and after the starting process is finished, controlling the first throttling element to recover to a first initial opening degree, controlling the second throttling element to recover to a second initial opening degree, opening the first valve, and controlling the second valve to be still in a closed state.
This embodiment is in the start-up state or under the shutdown state at refrigerating system, closes first valve and second valve, and all opens first throttling element and second throttling element to maximum aperture, can reduce the load when starting up and shutting down to make the switch on and shutting down more steady. After the starting process is finished, the first throttling element and the second throttling element are controlled to be in respective initial opening degrees, the first valve is opened, the second valve is closed, the first economizer with a large size is mainly used for air supplement, liquid level control is performed on the first economizer, air supplement pressure is controlled, and the effect of controlling the air supplement amount is achieved.
EXAMPLE III
The present embodiment describes the above-mentioned make-up air control method with reference to the refrigeration system shown in fig. 2, however, it should be noted that this embodiment is only for better describing the present application and should not be construed as a limitation to the present application. The same or corresponding terms as those of the above-described embodiments are explained, and the description of the present embodiment is omitted.
For the first economizer 4, its optimum liquid level range [ H3, H4], defined as: when the liquid level in the first economizer 4 is lower than H3, the failure of gas supply is easy to occur; when the liquid level in the first economizer 4 is higher than H4, the air entrainment is likely to occur.
For the second economizer 5, its optimum liquid level range [ H5, H6] is set, which is defined as: when the liquid level in the second economizer 5 is lower than H5, the failure of gas supply is easy to occur; when the liquid level in the second economizer 5 is higher than H6, the air entrainment is likely to occur.
The set values of H3, H4, H5, H6 may all be set based on actual test data.
For the first and second throttling elements 51 and 52, initial opening degrees K1 and K2 are set. The initial opening K1 and K2 may be determined according to the distributed flow rate of the second economizer 5, and are generally determined according to an opening of about 20% to 50% to ensure a sufficient adjustment margin.
The refrigeration system may include the following states: a power-on state, a normal operation state and a power-off state.
In the power-on and power-off states, the first valve 43 and the second valve 53 are both closed, and the first throttling element 51 and the second throttling element 52 are both opened to the maximum opening degree, so that the load during starting and power-off is reduced, and the startup and shutdown are more stable. After the start-up process is completed, the first throttle element 51 and the second throttle element 52 are restored to their respective initial opening degrees, the first valve 43 is opened, and the second valve 53 is maintained in a closed state.
In a normal operation state, the control steps are as follows:
(1) the liquid level in the first economizer 4 is within the optimal liquid level range, and the first throttling element 51 and the second throttling element 52 are kept at the current opening degree;
(2) when the liquid level in the first economizer 4 is lower than the lower limit H3 of the optimal liquid level range, gradually closing the first throttling element 51, and maintaining the initial opening K2 of the second throttling element 52 until the liquid level in the first economizer 4 returns to the optimal liquid level range or the opening of the first throttling element 51 is closed to 0;
(3) when the liquid level in the first economizer 4 is higher than the upper limit H4 of the optimal liquid level range, the first throttling element 51 and the second throttling element 52 are gradually opened at the same time until the liquid level in the first economizer 4 returns to the optimal liquid level range, or the opening degrees of the first throttling element 51 and the second throttling element 52 reach the maximum;
(4) if the first throttling element 51 is turned off to be minimum, the liquid level in the first economizer 4 is still lower than H3, or the first throttling element 51 and the second throttling element 52 are both turned on to be maximum, the liquid level in the first economizer 4 is still higher than H4, and when the time lasts for more than 5min, the first valve 43 is closed, the second valve 53 is opened, and the liquid level of the second economizer 5 is controlled;
(5) when the liquid level in the second economizer 5 is within the optimal liquid level range, the first throttling element 51 and the second throttling element 52 both keep the current opening degree;
(6) when the liquid level in the second economizer 5 is lower than the lower limit H5 of the optimal liquid level range, the first throttling element 51 is gradually opened, and the second throttling element 52 maintains the initial opening K2 until the liquid level in the second economizer 5 returns to the optimal liquid level range or the opening of the first throttling element 51 is opened to the maximum. When the first throttling element 51 is opened to the maximum, but the liquid level in the second economizer 5 is still lower than H5, gradually closing the second throttling element 52 until the liquid level in the second economizer 5 returns to the optimal liquid level range;
(7) when the liquid level in the second economizer 5 is higher than the upper limit H6 of the optimal liquid level range, the second throttling element 52 is gradually opened, and the first throttling element 51 maintains the initial opening K1 until the liquid level in the second economizer 5 returns to the optimal liquid level range or the opening of the second throttling element 52 reaches the maximum. When the opening degree of the second throttling element 52 reaches the maximum, but the liquid level in the second economizer 5 is still higher than H6, gradually closing the first throttling element 51 until the liquid level in the second economizer 5 returns to the optimal liquid level range;
(8) when the operating conditions of the unit change, which causes the liquid level in the first economizer 4 to return to the optimal liquid level range, the second valve 53 is closed, the first valve 43 is opened, and the control on the liquid level of the first economizer 4 is returned.
In the refrigeration system with two air supply paths, two refrigerant liquids are led out from a condenser, one path adopts a large open economizer and throttling elements (namely the third throttling element and the fourth throttling element, such as a throttling orifice plate) with fixed front and back serial opening degrees to ensure stable air supply amount, and the other path adopts a small open economizer and throttling elements (namely the first throttling element and the second throttling element, such as an electronic expansion valve) with adjustable front and back serial opening degrees. The opening degree of the first throttling element and the opening degree of the second throttling element are controlled by sensing the liquid levels in the two open economizers and the operating parameters of the unit, so that the liquid level heights in the two economizers are controlled, and meanwhile, the valves on the two air supply pipelines are controlled to be opened and closed under different operating states of the unit, so that the air supply pressure and the air supply amount are controlled. The refrigerating system can adapt to load change under different working conditions, so that the unit achieves a better energy efficiency ratio.
Example four
Based on the same inventive concept, this embodiment provides a gas compensation control device, which is applied to the refrigeration system described in the first embodiment and can be used to implement the gas compensation control methods described in the second and third embodiments. The device may be implemented in software and/or hardware, and may generally be integrated into a controller of the refrigeration system.
Fig. 4 is a block diagram of a gas compensation control device according to a fourth embodiment of the present invention, as shown in fig. 4, the device includes:
a first obtaining module 61, configured to obtain a liquid level in the first economizer during operation of the refrigeration system;
a first judging module 62, configured to judge whether a liquid level in the first economizer is within a first preset liquid level range;
and the first control module 63 is used for controlling the first throttling element and the second throttling element according to the relation between the liquid level in the first economizer and the first preset liquid level range so as to adjust the liquid level in the first economizer if the liquid level in the first economizer is not in the first preset liquid level range.
Optionally, the first control module 63 includes:
the first control unit is used for reducing the opening degree of the first throttling element if the liquid level in the first economizer is lower than the lower limit of the first preset liquid level range until the liquid level in the first economizer is in the first preset liquid level range or the opening degree of the first throttling element reaches the minimum opening degree;
and the second control unit is used for increasing the opening degree of the first throttling element and simultaneously increasing the opening degree of the second throttling element if the liquid level in the first economizer is higher than the upper limit of the first preset liquid level range until the liquid level in the first economizer is in the first preset liquid level range or the opening degrees of the first throttling element and the second throttling element reach the maximum opening degree.
Optionally, the first control module 63 further includes:
a third control unit, configured to close the first valve and open the second valve if the opening degree of the first throttling element reaches a minimum opening degree, but the liquid level in the first economizer is still lower than the lower limit of the first preset liquid level range, or if the opening degrees of the first throttling element and the second throttling element both reach a maximum opening degree, but the liquid level in the first economizer is still higher than the upper limit of the first preset liquid level range;
wherein the first valve is located on a connecting line between the first economizer and a first air supplement port of a compressor, and the second valve is located on a connecting line between a second economizer and a second air supplement port of the compressor.
Optionally, the first control module 63 further includes:
and the fourth control unit is used for closing the first valve and opening the second valve if the opening degree of the first throttling element reaches the minimum opening degree, but the liquid level in the first economizer is still lower than the lower limit of the first preset liquid level range and continuously exceeds a first preset time length, or if the opening degrees of the first throttling element and the second throttling element both reach the maximum opening degree, but the liquid level in the first economizer is still higher than the upper limit of the first preset liquid level range and continuously exceeds the first preset time length.
Optionally, the apparatus further comprises: and the second control module is used for controlling the first throttling element and the second throttling element to maintain the current opening degree unchanged if the liquid level in the first economizer is within a first preset liquid level range.
Optionally, the apparatus further comprises:
the second acquisition module is used for acquiring the liquid level in the second economizer after the first valve is closed and the second valve is opened;
the second judgment module is used for judging whether the liquid level in the second economizer is within a second preset liquid level range or not;
and the third control module is used for controlling the first throttling element and the second throttling element according to the relation between the liquid level in the second economizer and a second preset liquid level range so as to adjust the liquid level in the second economizer if the liquid level in the second economizer is not in the second preset liquid level range.
Optionally, the apparatus further comprises:
and the fourth control module is used for controlling the first throttling element and the second throttling element to maintain the current opening degree unchanged if the liquid level in the second economizer is within a second preset liquid level range.
Optionally, the third control module includes:
and the fifth control unit is used for increasing the opening degree of the first throttling element if the liquid level in the second economizer is lower than the lower limit of the second preset liquid level range until the liquid level in the second economizer is in the second preset liquid level range or the opening degree of the first throttling element reaches the maximum opening degree.
Further, the third control module further includes:
and the sixth control unit is used for reducing the opening degree of the second throttling element until the liquid level in the second economizer is in the second preset liquid level range if the opening degree of the first throttling element reaches the maximum opening degree but the liquid level in the second economizer is still lower than the lower limit of the second preset liquid level range.
Optionally, the third control module includes:
and the seventh control unit is used for increasing the opening degree of the second throttling element if the liquid level in the second economizer is higher than the upper limit of the second preset liquid level range until the liquid level in the second economizer is in the second preset liquid level range or the opening degree of the second throttling element reaches the maximum opening degree.
Further, the third control module further includes:
and the eighth control unit is used for reducing the opening degree of the first throttling element if the opening degree of the second throttling element reaches the maximum opening degree but the liquid level in the second economizer is still higher than the upper limit of the second preset liquid level range until the liquid level in the second economizer is in the second preset liquid level range.
Optionally, the apparatus further comprises:
and the fifth control module is used for closing the second valve and opening the first valve if the liquid level in the first economizer is detected to be within the first preset liquid level range after the first valve is closed and the second valve is opened.
Optionally, the apparatus further comprises:
the sixth control module is used for controlling the first valve and the second valve to be in a closed state and controlling the first throttling element and the second throttling element to be in a maximum opening degree when the refrigeration system is in a starting state or a shutdown state; and after the starting process is finished, controlling the first throttling element to recover to a first initial opening degree, controlling the second throttling element to recover to a second initial opening degree, opening the first valve, and controlling the second valve to be still in a closed state.
The device can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
EXAMPLE five
The present embodiment provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the gas compensation control method according to the above embodiment.
EXAMPLE six
The embodiment provides an air conditioning apparatus including: the refrigeration system of the above embodiment. The air conditioning equipment can also comprise the air supply control device in the embodiment. The air conditioning equipment of this embodiment constitutes two way tonifying qi structures through first economic ware and second economic ware, through the first throttling element of aperture adjustable and second throttling element, can control the liquid level height in first economic ware and the second economic ware to control tonifying qi pressure, and then realize the effective control of tonifying qi volume, promote the unit efficiency.
EXAMPLE seven
The present embodiment provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to implement the method for controlling gas supply as described in the above embodiments.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (24)

1. A refrigeration system comprising: compressor, condenser and evaporimeter, its characterized in that, refrigerating system still includes: a first economizer and a second economizer;
the first economizer and the second economizer are connected in parallel between the condenser and the evaporator;
the first economizer and the second economizer are both connected to a make-up port of the compressor;
and a first throttling element is arranged on a connecting pipeline between the second economizer and the condenser, and a second throttling element is arranged on a connecting pipeline between the second economizer and the evaporator, wherein the opening degrees of the first throttling element and the second throttling element are adjustable.
2. The refrigeration system of claim 1, further comprising: a third throttling element and a fourth throttling element, wherein the opening degrees of the third throttling element and the fourth throttling element are fixed;
one end of the third throttling element is connected to the first liquid outlet of the condenser, and the other end of the third throttling element is connected to the liquid inlet of the first economizer;
one end of the fourth throttling element is connected to the liquid outlet of the first evaporator, and the other end of the fourth throttling element is connected to the first liquid inlet of the evaporator;
the air outlet of the first economizer is connected to the first air supplement port.
3. The refrigerant system as set forth in claim 2, wherein said third throttling element is an orifice plate, and/or said fourth throttling element is an orifice plate.
4. The refrigerant system as set forth in claim 1, wherein a first valve is provided on a connection line between said first economizer and said first air supplement port.
5. The refrigeration system of claim 1 wherein the liquid inlet of the second economizer is connected to the second liquid outlet of the condenser through the first throttling element, the liquid outlet of the second economizer is connected to the second liquid inlet of the evaporator through the second throttling element, and the gas outlet of the second economizer is connected to the second make-up gas port.
6. The refrigerant system as set forth in claim 1, wherein said first throttling element is an electronic expansion valve, and/or said second throttling element is an electronic expansion valve, and/or a first level sensor is disposed within said first economizer, and/or a second level sensor is disposed within said second economizer.
7. The refrigerant system as set forth in claim 1, wherein a second valve is provided on a connection line between said second economizer and said second air make-up port.
8. The refrigeration system as recited in any one of claims 1 to 7 wherein a volume of the first economizer is greater than a volume of the second economizer.
9. A method for controlling make-up air, the method being applied to a refrigeration system according to any one of claims 1 to 8, the method comprising:
acquiring a liquid level in a first economizer during operation of the refrigeration system;
judging whether the liquid level in the first economizer is within a first preset liquid level range or not;
and if not, controlling a first throttling element and a second throttling element according to the relation between the liquid level in the first economizer and the first preset liquid level range so as to adjust the liquid level in the first economizer.
10. The method of claim 9, wherein controlling a first throttling element and a second throttling element as a function of the level of liquid in the first economizer to the first preset level range comprises:
if the liquid level in the first economizer is lower than the lower limit of the first preset liquid level range, reducing the opening degree of the first throttling element until the liquid level in the first economizer is in the first preset liquid level range or the opening degree of the first throttling element reaches the minimum opening degree;
and if the liquid level in the first economizer is higher than the upper limit of the first preset liquid level range, increasing the opening degree of the first throttling element, and simultaneously increasing the opening degree of the second throttling element until the liquid level in the first economizer is in the first preset liquid level range or the opening degrees of the first throttling element and the second throttling element reach the maximum opening degree.
11. The method of claim 10, further comprising:
if the opening degree of the first throttling element reaches the minimum opening degree, but the liquid level in the first economizer is still lower than the lower limit of the first preset liquid level range, or if the opening degrees of the first throttling element and the second throttling element both reach the maximum opening degree, but the liquid level in the first economizer is still higher than the upper limit of the first preset liquid level range, closing the first valve and opening the second valve;
wherein the first valve is located on a connecting line between the first economizer and a first air supplement port of a compressor, and the second valve is located on a connecting line between a second economizer and a second air supplement port of the compressor.
12. The method of claim 10, further comprising:
if the opening degree of the first throttling element reaches the minimum opening degree, but the liquid level in the first economizer is still lower than the lower limit of the first preset liquid level range and continuously exceeds a first preset time length, or if the opening degrees of the first throttling element and the second throttling element both reach the maximum opening degree, but the liquid level in the first economizer is still higher than the upper limit of the first preset liquid level range and continuously exceeds the first preset time length, closing the first valve and opening the second valve;
wherein the first valve is located on a connecting line between the first economizer and a first air supplement port of a compressor, and the second valve is located on a connecting line between a second economizer and a second air supplement port of the compressor.
13. The method of claim 9, further comprising, after determining whether the liquid level within the first economizer is within a first predetermined liquid level range:
and if so, controlling the first throttling element and the second throttling element to maintain the current opening degree unchanged.
14. The method of claim 11 or 12, further comprising, after closing the first valve and opening the second valve:
acquiring a liquid level in the second economizer;
judging whether the liquid level in the second economizer is within a second preset liquid level range or not;
if not, controlling the first throttling element and the second throttling element according to the relation between the liquid level in the second economizer and the second preset liquid level range so as to adjust the liquid level in the second economizer.
15. The method of claim 14, further comprising, after determining whether the liquid level within the second economizer is within a second predetermined liquid level range:
and if so, controlling the first throttling element and the second throttling element to maintain the current opening degree unchanged.
16. The method of claim 14, wherein controlling the first throttling element and the second throttling element as a function of the liquid level within the second economizer to the second preset liquid level range comprises:
and if the liquid level in the second economizer is lower than the lower limit of the second preset liquid level range, increasing the opening degree of the first throttling element until the liquid level in the second economizer is in the second preset liquid level range or the opening degree of the first throttling element reaches the maximum opening degree.
17. The method of claim 16, wherein if the opening of the first throttling element reaches a maximum opening but the liquid level in the second economizer is still below the lower limit of the second predetermined liquid level range, the opening of the second throttling element is decreased until the liquid level in the second economizer is within the second predetermined liquid level range.
18. The method of claim 14, wherein controlling the first throttling element and the second throttling element as a function of the liquid level within the second economizer to the second preset liquid level range comprises:
and if the liquid level in the second economizer is higher than the upper limit of the second preset liquid level range, increasing the opening degree of the second throttling element until the liquid level in the second economizer is in the second preset liquid level range or the opening degree of the second throttling element reaches the maximum opening degree.
19. The method of claim 18, wherein if the opening of the second throttling element reaches a maximum opening, but the liquid level in the second economizer is still above the upper limit of the second preset liquid level range, the opening of the first throttling element is decreased until the liquid level in the second economizer is within the second preset liquid level range.
20. The method of claim 11 or 12, further comprising, after closing the first valve and opening the second valve:
and if the liquid level in the first economizer is detected to be within the first preset liquid level range, closing the second valve and opening the first valve.
21. The method of claim 9, further comprising:
when the refrigeration system is in a starting state or a shutdown state, controlling a first valve and a second valve to be in a closing state, and controlling a first throttling element and a second throttling element to be in a maximum opening degree;
after the starting process is finished, controlling the first throttling element to recover to a first initial opening degree, controlling the second throttling element to recover to a second initial opening degree, opening the first valve, and controlling the second valve to be still in a closed state;
wherein the first valve is located on a connecting line between the first economizer and a first air supplement port of a compressor, and the second valve is located on a connecting line between a second economizer and a second air supplement port of the compressor.
22. A gas make-up control device for a refrigeration system according to any one of claims 1 to 8, the device comprising:
the first acquisition module is used for acquiring the liquid level in the first economizer in the operation process of the refrigeration system;
the first judgment module is used for judging whether the liquid level in the first economic device is within a first preset liquid level range or not;
the first control module is used for controlling the first throttling element and the second throttling element according to the relation between the liquid level in the first economizer and the first preset liquid level range to adjust the liquid level in the first economizer if the liquid level in the first economizer is not in the first preset liquid level range.
23. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the gas compensation control method according to any one of claims 9 to 21.
24. An air conditioning apparatus, characterized by comprising: the refrigeration system of any one of claims 1 to 8.
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