Compression condensing unit

Abstract

The invention relates to the technical field of compressors, in particular to a compression condensing unit which comprises a mounting seat, a positioning plate is arranged on one side of the upper portion of the mounting seat, a plurality of compression condensing unit bodies arranged in parallel are arranged on the positioning plate, a liquid storage device is arranged between the mounting seat and the positioning plate, and the liquid storage device communicates with the compression condensing unit bodies through connecting pipes. A control panel is arranged on one side of the mounting seat, and two pressure gauges and a plurality of control switches are arranged on the control panel; and the gas suction collecting pipe is arranged on one side of the mounting base, and a flow guiding and rectifying assembly and a regasification assembly are arranged in the gas collecting through pipe. Compared with the prior art, by arranging the flow guiding and rectifying assembly, eddy current and uneven distribution are effectively reduced; by combining the design of spiral guide sheets on the inner wall of the gas collection through pipe and interval grooves in the bottom, gas is guided to rotate forwards, self-rectification is achieved, turbulent flow is restrained, and gas flow uniformity and flow velocity stability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a compression condensing unit. BACKGROUND

[0002] The compression condensing unit is a core component in refrigeration and air conditioning systems, widely used in cold chain transportation, commercial refrigerators, industrial cooling and central air conditioning systems, etc. The system mainly consists of a compressor, a condenser, a throttling device and an evaporator, etc. The low-pressure gaseous refrigerant is compressed into high-pressure high-temperature gas by the compressor, and then condensed into high-pressure liquid after being cooled by the condenser. The throttling device enters the evaporator to absorb heat and evaporate, and finally returns to the compressor to form a refrigeration cycle.

[0003] In the prior art, the patent literature CN115388575A discloses a hot gas defrosting direct-current variable frequency compression condensing unit, which collects the operating parameters at each stage of the refrigeration system, adjusts the operating frequency of the direct-current variable frequency compressor flexibly, and reverses the four-way reversing valve to defrost when the system is frosting, so as to realize rapid cooling, rapid defrosting and reduce temperature fluctuations. However, similar to the traditional method, in a condensing system composed of multiple compressors in parallel, an air suction header is usually provided to collect or distribute the air flow between the compressors. However, most traditional headers use simple straight pipe structures, which do not effectively guide and rectify the direction and speed of the gas flow, which can easily cause uneven air distribution, resulting in uneven load of the compressors, reduced overall system efficiency, and even affecting the service life of some compressors. In addition, modern systems often use reversible cycle structures to realize refrigeration / heat switching. In the heating mode, there may be liquid refrigerant that has not been fully evaporated returning to the compressor with the air flow. If there is no vapor-liquid separation and regasification measures, liquid knock phenomenon is likely to occur, causing mechanical damage to the compressor, and in severe cases, the equipment may fail. Therefore, the present application discloses a compression condensing unit. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a compression condensing unit to solve the problem of uneven air distribution and liquid refrigerant backflow caused by the use of simple straight pipe structure in the air suction header of the traditional multiple-compressor condensing system, resulting in uneven load of the compressors and liquid knock risk.

[0005] To achieve the above purpose, the present application provides a compression condensing unit, which comprises a mounting seat, a positioning plate is arranged on one side of the upper part of the mounting seat, a plurality of compression condensing machine bodies are arranged in parallel on the positioning plate, a liquid accumulator is arranged between the mounting seat and the positioning plate, the liquid accumulator is connected in communication with the compression condensing machine bodies through connecting pipes to supply liquid, a control panel is arranged on one side of the mounting seat, two pressure gauges and a plurality of control switches are arranged on the control panel.

[0006] An air suction header is arranged on one side of the mounting base, and an air outlet pipe is arranged above each of the compression-condensation machine bodies, and one side of the air outlet pipe is connected with a gas collection pipe, and the other side of the gas collection pipe is connected with the air suction header;

[0007] An oil separator is arranged at a corner of the mounting base, and the oil separator is connected with one side of the air suction header, and an oil guide pipe is arranged at the bottom of the oil separator, and one side of each of the compression-condensation machine bodies is arranged with an oil communication pipe connected with the oil guide pipe;

[0008] The gas collection pipe is internally provided with a flow guide rectification assembly and a regasification assembly, the flow guide rectification assembly is embedded in the inner side of the gas collection pipe, for optimizing the gas flow path, and the regasification assembly is arranged at the bottom of the gas collection pipe, for regasifying the accumulated liquid refrigerant, to avoid liquid impact.

[0009] Preferably, the flow guide rectification assembly comprises a first guide cover sleeved at the connection between the air outlet pipe and the gas collection pipe, and a second guide cover arranged at the side of the gas collection pipe close to the air outlet pipe, and the first guide cover and the second guide cover are both arranged in a conical shape, the first guide cover is used for guiding the gas from the thin pipe of the air outlet pipe to the thick pipe of the gas collection pipe, and the second guide cover is used for converging the gas to the center.

[0010] Preferably, the contraction angle of the second guide cover is arranged to be between 30° and 45°, and the second guide cover is arranged in stainless steel.

[0011] Preferably, the flow guide rectification assembly further comprises a guide vane arranged on the inner wall of the gas collection pipe, and the guide vane is arranged in a spiral shape, and the lead of the guide vane is arranged to be twice the pipe diameter.

[0012] Preferably, the bottom of the gas collection pipe is provided with a spacing groove, the spacing groove separates the guide vanes to form intermittent guide vanes, for balancing the centrifugal effect and pressure drop.

[0013] Preferably, the re-gasification assembly comprises a submerged sump opening at the bottom of the gas collection pipe, the submerged sump is provided with two layers, the two layers of the submerged sump are separated by a partition, the bottom layer of the submerged sump is provided with a plurality of heating wires, the top of the heating wires penetrates the top surface of the partition, the bottom layer of the submerged sump is also provided with a plurality of temperature detectors, the top surface of the partition is lower than the bottom surface of the gas collection pipe, and the top surface of the submerged sump is provided with a cover plate, a plurality of through holes are formed in the cover plate, the bottom of the two sides of the gas collection pipe is provided with a baffle higher than the top surface of the submerged sump, and the baffle is provided in a way that it is pulled out of the mold, and the other side of the baffle gradually descends to abut against the bottom surface of the gas collection pipe.

[0014] Preferably, the middle part of the top surface of the partition is provided with a parallel strip, a plurality of ultrasonic atomizers are arranged on the parallel strip, the ultrasonic atomizers are arranged in a submerged manner on the parallel strip, the ultrasonic atomizers are used to accelerate the gasification of the liquid in the submerged sump, and one side of the submerged sump is also provided with a liquid discharge groove, the bottom of the liquid discharge groove extends to the outside of the gas collection pipe, and the bottom of the liquid discharge groove is provided with a valve.

[0015] Preferably, the bottom side of the mounting seat is also provided with a liquid supply filter, one side of the liquid supply filter is in communication with an external pipeline, and the other side of the liquid supply filter is provided with a liquid supply conveying pipe, and the other side of the liquid supply conveying pipe is in communication with the liquid reservoir.

[0016] Preferably, the compression condensing unit further comprises a dynamic suction balance and liquid hammer early warning control module, the module comprises:

[0017] A suction state monitoring unit is used to collect the suction flow Q i , suction temperature T i , pressure P i , and gas collection pipe bottom liquid level height H L of each parallel compressor in real time;

[0018] A control algorithm module is based on a multi-input fuzzy control method to establish a suction balance and gas-liquid identification model to output control variables such as suction adjustment amount ΔQ, heating compensation amount Q H , and liquid level discharge control signal S L ;

[0019] The fuzzy control method takes the following three state variables as input factors:

[0020] Suction deviation of each compressor: εQ=Q avg —Q i ;

[0021] Liquid level change rate:

[0022] Gas return temperature difference fluctuation:

[0023] And according to the state level "small", "medium", "big" fuzzy set, through the fuzzy rule table output and the current operating state matching control instruction, and then drive the following structure joint regulation:

[0024] Dynamic helical flow guide component angle adjustment;

[0025] Re-gasification heating wire power regulation;

[0026] Ultrasonic atomization device start-stop cycle;

[0027] Liquid level side discharge valve cycle opening and closing adjustment.

[0028] Preferably, the fuzzy control method further comprises the following regulation logic and execution mechanism:

[0029] By setting three-dimensional fuzzy rule table, three-factor εQ, εH and εT input as state coordinates, corresponding output ΔQ, Q H And S L Three-dimensional regulation set, form dynamic control block;

[0030] Fuzzy reasoning mechanism: according to the fuzzy set matching degree using the gravity method to solve the fuzzification, convert the fuzzy control quantity into physical quantity, form the execution instruction;

[0031] Adaptive optimization mechanism: the control algorithm can automatically optimize the fuzzy rule table weight and interval division based on long-period operation data, to improve the regulation accuracy under multiple working conditions;

[0032] Execution feedback channel: each regulation device executes the real-time feedback change value to the control algorithm module, used for forming closed loop regulation, ensure the output stability.

[0033] The beneficial effects of the present application are:

[0034] 1. The compression condensing unit, by setting the flow guide assembly, by setting the conical first guide cover and the second guide cover, realize the smooth transition and center gathering between the outlet pipe and the gas collection pipe, effectively reduce the vortex and uneven distribution; Combined with the helical guide piece in the inner wall of the gas collection pipe and the bottom interval groove design, guide the gas rotation forward, self-regulation and inhibit turbulence, improve the uniformity and stability of flow rate.

[0035] 2. The compression condensing unit is provided with a regasification assembly, adopts double-layer sinking liquid collecting groove structure, realizes efficient vapor-liquid separation through gravity settling and baffle guiding, and utilizes through heating wires for layered heating and liquid preheating, effectively prevents frost blockage and liquid impact, the atomizer is installed in the sinking top surface of the partition plate, can quickly convert the liquid refrigerant into stable gas phase, improves the regasification efficiency; the cover plate through hole cooperates with the air flow to assist the gas backflow and participate in the subsequent circulation. The assembly also has a liquid discharge structure and temperature detection function, ensuring the safety, rapid response capability and long-term operation reliability of the system in the initial rich liquid, low temperature or heating mode. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only illustrate the present application, and other drawings can also be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0037] Figure 1 It is a first perspective view of the structure of the present application.

[0038] Figure 2 It is a second perspective view of the structure of the present application.

[0039] Figure 3 It is a plan view of the structure of the present application.

[0040] Figure 4 It is a structure diagram of the gas collecting pipe of the present application.

[0041] Figure 5 It is a structure diagram of the gas collecting pipe and the second guide cover of the present application.

[0042] Figure 6 It is a structure diagram of the gas collecting pipe of the present application.

[0043] Figure 7 It is a structure diagram of the gas collecting pipe of the present application.

[0044] Figure 8 It is a structure diagram of the gas collecting pipe of the present application. Figure 7

[0045] Figure 9 It is a structure diagram of the gas collecting pipe of the present application.

[0046] In the figure, the following marks are:

[0047] ​1, mounting seat; 2, positioning plate; 3, compression condensing machine body; 4, air suction header; 5, air outlet pipe; 6, first guide cover; 7, air collection pipe; 8, second guide cover; 9, oil separator; 10, oil guide pipe; 11, oil communication pipe; 12, liquid supply filter; 13, liquid supply delivery pipe; 14, guide vane; 15, interval groove; 16, sinking liquid collection groove; 17, heating wire; 18, partition plate; 19, parallel strip; 20, ultrasonic atomizer; 21, cover plate; 22, liquid discharge groove; 23, baffle; 24, liquid reservoir; 25, pressure gauge; 26, control switch. DETAILED DESCRIPTION

[0048] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to specific examples.

[0049] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the present application should be understood as their common meanings to those skilled in the art to which the present application pertains. The terms "first", "second" and similar terms used in the present application do not indicate any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the components or objects before the terms cover the components or objects listed after the terms and their equivalents, and do not exclude other components or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0050] As Figures 1 to 9As shown, the compression condensing unit, including the mounting seat 1, the upper side of the mounting seat 1 is provided with a positioning plate 2, the positioning plate 2 is provided with a plurality of parallel compression condensing machine bodies 3, the storage tank 24 is arranged between the mounting seat 1 and the positioning plate 2, the storage tank 24 is communicated with the compression condensing machine body 3 through the connecting pipe respectively, and the liquid supply is carried out, one side of the mounting seat 1 is provided with a control panel, the control panel is provided with two pressure gauges 26 and a plurality of control switches 25; the suction header 4 is arranged on one side of the mounting seat 1, the oil separator 9 is communicated with one side of the suction header 4, the upper side of each of the plurality of compression condensing machine bodies 3 is provided with the gas outlet pipe 5, one side of the gas outlet pipe 5 is communicated with the gas collection pipe 7, the other side of the gas collection pipe 7 is communicated with the suction header 4; the oil separator 9 is arranged at a corner of the mounting seat 1, the bottom of the oil separator 9 is provided with the oil guide pipe 10, one side of the compression condensing machine body 3 is provided with the oil communication pipe 11 communicated with the oil guide pipe 10; the gas collection pipe 7 is provided with a flow guide rectifier assembly and a regasification assembly inside, the flow guide rectifier assembly is embedded in the inside of the gas collection pipe 7, and is used for optimizing the airflow path, the regasification assembly is arranged at the bottom of the gas collection pipe 7, and is used for regasifying the accumulated liquid refrigerant, avoiding liquid hammer, wherein one side of the bottom of the mounting seat 1 is also provided with a liquid supply filter 12, one side of the liquid supply filter 12 is communicated with the external pipeline, the other side of the liquid supply filter 12 is provided with a liquid supply conveying pipe 13, and the other side of the liquid supply conveying pipe 13 is communicated with the storage tank 24;

[0051] After the system is started, the liquid supply filter 12 introduces refrigerant from the external pipeline, filters it, and then sends it to the liquid storage tank 24 through the liquid supply delivery pipe 13 for storage, and then supplies it to each compression condensing machine body 3 through the connecting pipe; each body sucks in low-pressure gaseous refrigerant from the suction header 4, compresses it, and then discharges high-temperature and high-pressure gas to the gas collection pipe 7 through the gas outlet pipe 5; the flow guide and rectification assembly in the gas collection pipe 7 makes the gas flow more smoothly, and if there is liquid refrigerant that has not completely vaporized at the bottom, it is treated and re-vaporized by the re-vaporization assembly to prevent liquid hammer; the gas is collected into the suction header 4 and returned to the condensing system for the next cycle; at the same time, the lubricating oil entrained in the gas is separated in the oil separator 9 and returned to the compressor body through the oil return guide pipe 10 and the oil return communication pipe 11, ensuring closed-loop operation of the lubrication system; the pressure gauge 25 on the control panel monitors the system pressure in real time, and if necessary, issues a warning or adjusts the pressure, and the control switch 26 realizes independent start-stop control of multiple compression condensing machines, thereby completing a round of stable and efficient refrigeration and oil-gas separation operation process. By setting a flow guide and rectification assembly inside the gas collection pipe 7, the return gas flow from each gas outlet pipe 5 is effectively guided, the gas flow path is rectified, and the return gas distribution of different compression condensing machines is more uniform, avoiding uneven load caused by excessive or insufficient gas flow of a certain unit, improving the stability of the system and the collaborative working ability of the compressor. In the reversible cycle heating mode, return gas is needed, and the re-vaporization assembly is provided at the bottom of the gas collection pipe 7 to re-vaporize the liquid refrigerant that may be entrained in the return flow, effectively eliminating the risk of liquid hammer caused by liquid refrigerant directly entering the compressor, improving the safety and reliability of equipment operation, and is particularly suitable for operating conditions in the reversible cycle heating mode.

[0052] As shown in Figure 5 , Figure 6 , Figure 9 The flow guide and rectification assembly includes a first guide cover 6 located at the connection between the gas outlet pipe 5 and the gas collection pipe 7, and a second guide cover 8 located near the side of the gas collection pipe 7 close to the gas outlet pipe 5. The first guide cover 6 and the second guide cover 8 are both conical in shape. The first guide cover 6 is used to guide the gas from the thin pipe of the gas outlet pipe 5 to the thick pipe of the gas collection pipe 7, and the second guide cover 8 is used to bring the gas closer to the center. The contraction angle of the second guide cover 8 is set to between 30° and 45°, and the second guide cover 8 is made of stainless steel.

[0053] The high-pressure gas discharged by the compression condensing machine first flows out at high speed from the gas outlet pipe 5, at this time, the first guide cover 6 provided with a taper is entered, the guide cover smoothly guides the high-speed gas sprayed by the thin pipe into the thicker gas collecting pipe 7, slows down the turbulent impact and forms a smooth transition, when the gas continues to flow forward, the second guide cover 8 provided at the turning position of the gas collecting pipe 7 is contacted, the second guide cover 8 guides the gas to the center with the contraction angle of 30°-45°, so that the distribution is more concentrated, the flow rate is more stable, the uneven distribution or edge vortex problem is effectively avoided, the flow field foundation for subsequent regasification and suction gas header 4 transportation is laid, and the overall gas flow balance and compressor load consistency are improved;

[0054] The flow guide rectification assembly further comprises a guide vane 14 arranged on the inner wall of the gas collecting pipe 7, the guide vane 14 is arranged in a spiral shape, the lead of the guide vane 14 is arranged as twice the pipe diameter, and the bottom of the gas collecting pipe 7 is provided with a spacing groove 15, the spacing groove 15 separates the guide vanes 14, forming intermittent guide vanes 14, for balancing the centrifugal effect and pressure drop;

[0055] In the lead comparison experiment, the data table is as follows (the unit is unified, and the data is a schematic fitting):

[0056]

[0057] Among them, the pipe diameter D = 100 mm (for normalization analysis), the experimental variables are: the lead of the guide vane 14 = 0.5D, 1D, 1.5D, 2D, 2.5D, 3D, the gas flow is kept the same under each lead test, the test pipe length is consistent, 10s steady-state data is collected, and 3 groups are repeated and averaged, so when the lead is 2D (twice the pipe diameter), the multiple key performance indicators reach the optimal balance point:

[0058] When the gas stabilized by the guide cover enters the inside of the gas collecting pipe 7, the guide vane 14 arranged in a spiral shape on the inner wall of the pipe will guide the gas to flow forward in a rotating state along the axial direction, producing a self-rectification effect, thereby inhibiting the middle turbulent flow and the boundary layer accumulation, improving the gas distribution uniformity and flow stability, and at the same time, in the process of the gas continuing to advance along the pipe, the spacing groove 15 provided at the bottom of the pipe is encountered, the spacing groove 15 disconnects the continuous guide vanes 14, forming intermittent flow guide sections, this structure ensures the rotation of the gas flow while reducing the pressure drop caused by continuous rotational flow, so that the gas flow can smoothly pass through the gas collecting pipe 7 and enter the suction gas header 4 with lower energy consumption, realizing the directional and stable transportation of the gas flow, effectively avoiding the phenomenon that some compression condensing machines are overloaded while others are insufficient, and guaranteeing the overall gas balance and operation consistency of the multi-unit system.

[0059] As Figures 6 to 9As shown, the re-gasification assembly includes a submerged liquid collection tank 16 opened at the bottom of the gas collection pipe 7, the submerged liquid collection tank 16 is provided with two layers, the two layers of the submerged liquid collection tank 16 are separated by a partition plate 18, the bottom layer of the submerged liquid collection tank 16 is provided with a plurality of heating wires 17, the top of the heating wires 17 penetrates the top surface of the partition plate 18, the bottom layer of the submerged liquid collection tank 16 is also provided with a plurality of temperature detectors, the top surface height of the partition plate 18 is lower than the bottom surface height of the gas collection pipe 7, and the top surface of the submerged liquid collection tank 16 is provided with a cover plate 21, a plurality of through holes are opened on the cover plate 21, the bottom of the two sides of the gas collection pipe 7 is provided with a baffle 23 higher than the top surface of the submerged liquid collection tank 16, and the baffle 23 is provided outwardly, the other side of the baffle 23 gradually descends to abut against the bottom surface of the gas collection pipe 7, the middle part of the top surface of the partition plate 18 is provided with a parallel strip 19, a plurality of ultrasonic atomizers 20 are arranged on the parallel strip 19, the ultrasonic atomizers 20 are arranged downwardly on the parallel strip 19, and the ultrasonic atomizers 20 are used for accelerating the gasification of the liquid in the submerged liquid collection tank 16, one side of the submerged liquid collection tank 16 is also provided with a liquid discharge groove 22, the bottom of the liquid discharge groove 22 extends to the outside of the gas collection pipe 7, and the bottom of the liquid discharge groove 22 is provided with a valve;

[0060] During the operation of the compression condensation system, part of the liquid refrigerant that is not completely gasified may enter the inside of the gas collection pipe 7 with high-pressure gas, due to the large density of the liquid, these liquid refrigerants will naturally settle at the bottom of the pipe under the action of the gas flow, and will be preferentially collected into the submerged liquid collection tank 16 under the guidance of the baffle 23 designed outwardly at the bottom of the two sides of the gas collection pipe 7, the submerged liquid collection tank 16 adopts an upper and lower two-layer structure, the flow path of the liquid is blocked by the partition plate 18, so that the liquid settles layer by layer under the action of gravity, thereby forming effective gas-liquid separation, and also prolonging the residence time of the liquid, which is beneficial to subsequent heating and gasification treatment, at the bottom of the liquid collection tank, the heating wires 17 arranged begin to heat the bottom layer of liquid refrigerant, part of the liquid is directly converted into steam during the heating process; due to the fact that the heating wires 17 penetrate the top surface of the partition plate 18, the upper layer of liquid can also be preheated synchronously, this downward heating mode, especially under low-temperature operating conditions, can actively heat and preheat the liquid, effectively preventing frost blocking from occurring in the tank or at the bottom of the pipe, greatly improving the starting ability and operation reliability of the system under severe cold conditions

[0061] In addition, when the system switches to heating mode or is initially started, due to the drastic change in gas-liquid state and the high possibility of liquid enrichment, the liquid collection tank structure can also utilize its sinking characteristics and the guiding effect of the baffle 23 to achieve preliminary gas-liquid separation through gravity settling, quickly sink the liquid to the bottom of the tank, and avoid liquid being sucked into the compressor to cause liquid hammer. At the same time, through the combination of heating wire 17 re-gasification + ultrasonic atomization acceleration rising, the initial liquid-rich state can be effectively converted into dry gas, greatly improving the system stability and response efficiency. The entire re-gasification assembly is also equipped with a temperature detector that can monitor the liquid temperature change in real time, feed back to the control system, and realize intelligent adjustment of the heating state to ensure the safety and efficiency of the re-gasification process. In abnormal or shutdown state, the residual liquid can be discharged in time through the liquid discharge groove 22 on the side of the liquid collection tank.

[0062] The compression condensing unit also includes a dynamic suction equalization and liquid hammer early warning control module, which includes:

[0063] A suction state monitoring unit for real-time acquisition of the suction flow rate Q i , suction temperature T i , pressure P i , and liquid level height H L of each parallel compressor.

[0064] A control algorithm module based on a multi-input fuzzy control method to establish a suction equalization and gas-liquid identification model to output control variables such as suction adjustment amount ΔQ, heating compensation amount Q H , and liquid level discharge control signal S L .

[0065] The fuzzy control method takes the following three state variables as input factors:

[0066] Suction deviation of each compressor: εQ = Q avg - Q i .

[0067] Liquid level change rate:

[0068] Gas return temperature difference fluctuation:

[0069] According to the state levels "small", "medium", and "large", the fuzzy sets are divided, and the control instructions matching the current operating state are output through the fuzzy rule table, which in turn drives the following structure joint adjustment:

[0070] Dynamic spiral flow guide component angle adjustment;

[0071] Re-gasification heating wire power regulation;

[0072] Ultrasonic atomization device start-stop cycle;

[0073] Liquid level side drain valve periodic opening and closing adjustment

[0074] The fuzzy control method further comprises the following regulation logic and execution mechanism:

[0075] By setting a three-dimensional fuzzy rule table, taking three factors εQ, εH and εT as state coordinates, and corresponding outputs ΔQ, Q H and S L of a three-dimensional regulation set, a dynamic control block is formed;

[0076] Fuzzy inference mechanism: according to the fuzzy set matching degree, the gravity method is used to solve the fuzzification, the fuzzy control quantity is converted into a physical quantity, and an execution instruction is formed;

[0077] Self-adaptive optimization mechanism: the control algorithm can automatically optimize the fuzzy rule table weight and interval division based on long-period operation data to improve the regulation and control precision under multiple working conditions;

[0078] Execution feedback channel: the real-time feedback value of each regulating device after execution is fed back to the control algorithm module, which is used to form a closed-loop regulation to ensure stable output;

[0079] The fuzzy control module is embedded in the control board and integrated into the original control system of the unit; a flow meter is arranged above each compressor or gas outlet pipe 5, temperature and pressure sensors are embedded in the pipe wall, and a liquid level sensor is arranged at the bottom of the gas collection pipe 7. The sensor data is uploaded to the central control board in real time, and fuzzy inference and feedback control are executed through the control module;

[0080] The fuzzy control process is as follows:

[0081] Input collection: the system regularly reads the data of each sensor and calculates three input factors;

[0082] Fuzzification processing: the input value is divided into "small, medium, large" and other grades according to the set membership function;

[0083] Rule matching: the fuzzy rule table is called (for example: if εQ is large, and εH is medium, and εT is small, then Q H is large, and S L is open);

[0084] Defuzzification calculation: the gravity method is used to defuzzify the control variables and convert them into actual control outputs;

[0085] Execution output: adjust the dynamic flow guide angle, heating wire 17 power, ultrasonic atomization sheet and liquid discharge valve action rhythm, etc.

[0086] Further, by dynamically adjusting the flow of each parallel channel through εQ, the system's air intake consistency is improved, the compressor's running load is more balanced, the service life is improved, and the noise and vibration are reduced;

[0087] The εH and εT variables monitor the liquid level fluctuation and cold-state back gas characteristics in real time, trigger the preheating and liquid discharge actions before liquid impact, and can identify liquid accumulation in advance compared with the traditional delay start mode relying on the heating wire 17, thereby achieving preventive rather than responsive control.

[0088] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; the above embodiments or technical features among different embodiments can also be combined, steps can be implemented in any order, and there are many other changes to the different aspects of the application as described above, which are not provided in detail for the sake of brevity. The above embodiments are only examples and are not intended to limit the scope of the application.

[0089] The present application is intended to cover all such alternatives, modifications, and variations as fall within the broad scope of the appended claims. Accordingly, any one of the above-mentioned alternatives, modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. Compression condensing unit, characterized in that: include: A mounting seat (1) is provided with a positioning plate (2) on one side above the mounting seat (1), and a plurality of compression condensing machine bodies (3) arranged in parallel are provided on the positioning plate (2). A liquid reservoir (24) is provided between the mounting seat (1) and the positioning plate (2), and the liquid reservoir (24) is connected to the compression condensing machine bodies (3) through connecting pipes for liquid supply. A control panel is provided on one side of the mounting seat (1), and two pressure gauges (25) and a plurality of control switches (26) are provided on the control panel. An air intake manifold (4), the air intake manifold (4) being arranged on one side of the mounting base (1), an air outlet pipe (5) being arranged above each of the compression condenser bodies (3), one side of the air outlet pipe (5) being connected to an air collecting pipe (7), and the other side of the air collecting pipe (7) being connected to the air intake manifold (4); An oil separator (9), the oil separator (9) being arranged at a corner of the mounting seat (1), the oil separator (9) being connected to one side of the air intake manifold (4), an oil guide pipe (10) being arranged at the bottom of the oil separator (9), and an oil connecting pipe (11) being connected to the oil guide pipe (10) being arranged on one side of the compression condenser body (3); The interior of the gas collecting pipe (7) is provided with a flow guiding and rectifying component and a regasification component. The flow guiding and rectifying component is embedded in the inner side of the gas collecting pipe (7) and is used to optimize the air flow path. The regasification component is provided at the bottom of the gas collecting pipe (7) and is used to regasify the accumulated liquid refrigerant to avoid liquid hammer.

2. The compression condensing unit according to claim 1, characterized in that: The flow guide and rectification assembly comprises a first guide cover (6) located at the connection between the outlet pipe (5) and the gas collecting pipe (7), and a second guide cover (8) located on the side of the gas collecting pipe (7) close to the outlet pipe (5). The first guide cover (6) and the second guide cover (8) are both arranged in a conical shape. The first guide cover (6) is used to guide the gas from the thin tube of the outlet pipe (5) to the thick tube of the gas collecting pipe (7), and the second guide cover (8) is used to bring the gas closer to the center.

3. The compression condensing unit according to claim 2, characterized in that: The retraction angle of the second guide cover (8) is set to be between 30° and 45°, and the second guide cover (8) is made of stainless steel.

4. The compression condensing unit according to claim 3, characterized in that: The flow guide and rectification assembly further comprises a guide piece (14) arranged on the inner wall of the gas collecting pipe (7), the guide piece (14) being arranged in a spiral shape, and the lead of the guide piece (14) being set to twice the pipe diameter.

5. The compression condensing unit according to claim 4, characterized in that: A spacing groove (15) is provided at the bottom of the gas collecting pipe (7), and the spacing groove (15) separates the guide blade (14) to form a discontinuous guide blade (14) for balancing the centrifugal effect and the pressure drop.

6. The compression condensing unit according to claim 5, characterized in that: The regasification assembly includes a sinking liquid collecting tank (16) opened at the bottom of the gas collecting pipe (7), the sinking liquid collecting tank (16) is arranged in two layers, and a partition (18) is arranged between the two layers of the sinking liquid collecting tank (16) for partitioning, the bottom layer of the sinking liquid collecting tank (16) is provided with a plurality of heating wires (17), the tops of the heating wires (17) all pass through the top surface of the partition (18), and the bottom layer of the sinking liquid collecting tank (16) is also provided with a plurality of temperature detectors. The top surface height of the partition (18) is lower than the bottom surface height of the gas collecting pipe (7), and the top surface of the sunken liquid collecting tank (16) is provided with a cover plate (21), and a plurality of through holes are opened on the cover plate (21). The bottoms of both sides of the gas collecting pipe (7) are provided with baffles (23) higher than the top surface of the sunken liquid collecting tank (16), and the baffles (23) are provided in an outward drafting arrangement, and the other side of the baffles (23) gradually descends to abut against the bottom surface of the gas collecting pipe (7).

7. The compression condensing unit according to claim 6, characterized in that: A parallel bar (19) is provided in the middle of the top surface of the partition (18), and a plurality of ultrasonic atomizers (20) are provided on the parallel bar (19). The ultrasonic atomizers (20) are arranged downward on the parallel bar (19), and the ultrasonic atomizers (20) are used to accelerate the gasification of the liquid inside the sunken liquid collecting tank (16). A drainage trough (22) is also provided on one side of the sunken liquid collecting tank (16), and the bottom of the drainage trough (22) extends to the outside of the gas collecting pipe (7), and a valve is provided at the bottom of the drainage trough (22).

8. The compression condensing unit according to claim 1, characterized in that: A liquid supply filter (12) is further provided on one side of the bottom of the mounting seat (1), one side of the liquid supply filter (12) is connected to an external pipeline, and a liquid supply delivery pipe (13) is provided on the other side of the liquid supply filter (12), and the other side of the liquid supply delivery pipe (13) is connected to the liquid reservoir (24).

9. The compression condensing unit according to claim 7, characterized in that: The compression condensing unit also includes a dynamic suction balance and liquid hammer warning control module, which includes: Suction state monitoring unit, used to collect the suction flow Q of each parallel compressor in real time i , suction temperature T i , pressure P i , and the liquid level height H at the bottom of the gas collecting pipe (7) L ; The control algorithm module establishes the suction balance and gas-liquid identification model based on the multi-input fuzzy control method to output the suction adjustment amount ΔQ and the heating compensation amount Q H , Liquid level control signal S L control variables; The following three state quantities are used as input factors in the fuzzy control method: Suction deviation of each compressor: εQ=Q avg —Q i ; Liquid level change rate: Return temperature fluctuation: Fuzzy sets are divided according to the status levels of "small", "medium" and "large", and control instructions that match the current operating status are output through the fuzzy rule table, thereby driving the following structure joint adjustment: Dynamic spiral guide component angle adjustment; Regasification heating wire power control; Ultrasonic atomization device start and stop cycle; Periodic opening and closing adjustment of the liquid level side discharge valve.

10. The compression condensing unit according to claim 9, characterized in that: The fuzzy control method also includes the following control logic and execution mechanism: By setting a three-dimensional fuzzy rule table, the three factors εQ, εH and εT are input as state coordinates, corresponding to the output ΔQ, Q H and S L A three-dimensional control set forms a dynamic control block; Fuzzy reasoning mechanism: Defuzzification is performed using the centroid method based on the fuzzy set matching degree, and the fuzzy control quantity is converted into a physical quantity to form an execution instruction; Adaptive optimization mechanism: The control algorithm can automatically optimize the weights and interval divisions of the fuzzy rule table based on long-term operating data to improve the control accuracy under multiple operating conditions; Execution feedback channel: After execution, each adjustment device feeds back the change value to the control algorithm module in real time to form a closed-loop adjustment to ensure output stability.

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