A wind-cooled variable frequency air conditioning system combining a refrigerant circulating pump and a compressor

Abstract

The application relates to the technical field of machine room air conditioning systems, and discloses a wind-cooled variable-frequency air conditioning system combining a refrigerant circulating pump and a compressor, which comprises a compressor, a condenser and an evaporator pipeline, a fluorine pump pipeline is connected in parallel between the condenser pipeline and the evaporator pipeline, a bypass branch is connected in parallel to the compressor pipeline, and the wind-cooled variable-frequency air conditioning system further comprises a buffer cylinder, the buffer cylinder comprises an outer cylinder and an inner cylinder, the inner cylinder is rotationally arranged in the outer cylinder, the inner cylinder comprises end covers and a middle partition plate which are perpendicular to each other, the end covers divide the space in the outer cylinder into an inner cavity of the inner cylinder and a transition cavity, the middle partition plate divides the inner cavity of the inner cylinder into a buffer cavity and a liquid storage cavity, the transition cavity is communicated with the condenser pipeline, the buffer cavity and the liquid storage cavity are communicated with the compressor pipeline and the bypass branch, and a buffer device is arranged on the middle partition plate. The problems that the switching of a circulating pump and a compressor in a double-circulation system is not efficient enough, the circulating pump is suddenly insufficient in pressure when switched, and the pressure is suddenly increased to damage the pipeline when switched to the compressor are solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of machine room air conditioning systems, in particular to a wind-cooled variable frequency air conditioning system combining a refrigerant circulating pump and a compressor. BACKGROUND

[0002] A data center requires constant indoor temperature, and an air conditioning system is required to cool it for 365 days a year. Data shows that the energy consumption of the air conditioning system accounts for more than 40% of the energy consumption of the data center, and is the second largest energy consumption unit of the data center. Therefore, reducing the energy consumption of the data center is one of the key measures for energy saving of the data center.

[0003] When the overall data center cooling system is used in the winter half year when the temperature is relatively low, the compressor needs to be started to cool even when the outdoor ambient temperature is low. If the compressor is started to cool in view of the low outdoor temperature, the energy transfer mode of the compressor is still adopted, the efficiency is not high, and a lot of operating costs are increased. However, in reality, when the outdoor temperature is low, it means that there is a lot of direct outdoor cold source that can be utilized. The existing air conditioning system cannot be directly utilized, and the energy conversion can only be transferred through the compressor. Obviously, this causes unnecessary waste of energy.

[0004] The direct fluorine circulation system has a significant energy saving advantage. It circulates the refrigerant directly between the indoor unit and the condenser, saves the multi-stage energy conversion of the water cooling system, reduces 15%-20% heat transfer loss, and the fluorine pump can stably operate in a-25℃ environment. Compared with the traditional air conditioner which needs to start electric heating to prevent freezing below-5℃, the natural cold source utilization window is widened. In terms of reliability, the compressor is stopped in the fluorine pump mode, which shortens the annual operation time by more than 50% to reduce wear and tear and prolong the service life. It can also completely eliminate the risks of pipe corrosion and water leakage of the chilled water system (avoiding 22% of server downtime accidents caused by data center failures), and save a variety of auxiliary equipment to reduce the failure points by more than 40%. In terms of operation and economy, the water-free system does not require water quality management and other work, reducing the demand for 30% of the operation and maintenance personnel, and the fluorine pump module is integrated into the outdoor unit, saving space and installation cost, and being suitable for renovation projects. It is also more environmentally adaptable, suitable for arid regions without water sources, and has better low-temperature performance than ethylene glycol solution systems. It can also dynamically switch modes in combination with AI algorithms to respond to electricity price peaks and temperature fluctuations.

[0005] Firstly, the existing control system cannot accurately and quickly realize efficient switching between the two, so that the system cannot be adjusted to the best operating state in time at the switching moment, which affects the cooling effect and additionally consumes unnecessary energy.

[0006] Secondly, when the system switches from the compressor mode to the circulating pump mode, the sudden pressure deficiency often occurs. This is because the pump system needs to ensure no gas into the pump before running, and during the switching process, if the control is improper, gas is easy to mix in, causing cavitation phenomenon, and then the impeller surface of the pump is subjected to cavitation impact and erosion, cavitation phenomenon occurs, causing the pump performance to decline, the pressure supply to be insufficient, and the stable operation of the entire air conditioning system to be affected.

[0007] Furthermore, conversely, when switching from the circulating pump mode to the compressor mode, the problem of sudden pressure increase is serious. Because the compressor needs to avoid liquid suction when working, and if the liquid cannot be effectively discharged in time during switching, it will cause the pressure to rise sharply after entering the compressor, which not only causes great damage to the compressor itself, but also can cause the connecting pipeline to be broken due to being unable to withstand the high pressure, greatly affecting the safety and reliability of the system. SUMMARY

[0008] (I) Technical problems solved

[0009] In view of the deficiencies in the prior art, the present application provides a wind-cooled variable frequency air conditioning system combining a refrigerant circulating pump and a compressor, which has the advantages of efficient switching of the circulating pump and the compressor, buffering effect when switching the compressor, and auxiliary pressure increasing effect when switching the circulating pump, and solves the problems of inefficient switching of the circulating pump and the compressor in the prior art, sudden pressure deficiency when switching the circulating pump, and pressure surge when switching to the compressor.

[0010] (II) Technical solutions

[0011] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0012] A wind-cooled variable frequency air conditioning system combining a refrigerant circulating pump and a compressor, comprising a compressor pipeline, a condenser pipeline and an evaporator pipeline connected in sequence and forming a closed loop, a fluorine pump pipeline is also connected in parallel on the pipeline between the condenser pipeline and the evaporator pipeline, a bypass branch is also connected in parallel on the compressor pipeline, a buffer cylinder is arranged at the three-way connection of the compressor pipeline, the bypass branch and the condenser pipeline, the buffer cylinder comprises an outer cylinder and an inner cylinder, the inner cylinder is rotationally arranged inside the outer cylinder, the inner cylinder comprises end covers and a middle partition plate perpendicular to each other, the end covers divide the space inside the outer cylinder into an inner cylinder cavity and a transition cavity, the middle partition plate divides the inner cylinder cavity into a buffer cavity and a liquid storage cavity, the transition cavity is communicated with the condenser pipeline, and the buffer cavity and the liquid storage cavity are communicated with the compressor pipeline and the bypass branch; a first valve is arranged on the end cover at a position corresponding to the buffer cavity, a buffer device is arranged on the middle partition plate, and the buffer device provides buffering for the buffer cavity.

[0013] Preferably, the partition plate is provided with a mounting hole at a position for mounting a buffering device, the buffering device comprises a piston and a baffle plate slidingly arranged in the mounting hole, a sliding groove is arranged on the inner wall of the mounting hole for limiting the sliding range of the baffle plate, a spring is arranged on the side of the baffle plate away from the piston, the other end of the spring is fixed on a mounting seat, the mounting seat is mounted on the partition plate, a hole and a back hole are respectively arranged on the baffle plate and the mounting seat, and the piston is separated from the baffle plate when the piston slides to the side close to the buffering cavity.

[0014] Preferably, the end cover of the inner cylinder comprises a buffering top cover and a liquid storage top cover, the buffering top cover slides on the side of the partition plate corresponding to the buffering cavity, the liquid storage top cover slides on the side of the partition plate corresponding to the liquid storage cavity, the first valve is arranged on the buffering top cover, and the second valve is arranged on the liquid storage top cover.

[0015] The outer cylinder is further provided with two telescopic cylinders, and the telescopic jacks of the two telescopic cylinders are respectively arranged on the buffering top cover and the liquid storage top cover to slide up and down.

[0016] Preferably, the partition plate is provided with an arc-shaped side plate on the side abutting against the inner wall of the outer cylinder, and the width of the arc-shaped side plate is greater than the size of the refrigerant inlet of the compressor pipeline and the bypass branch.

[0017] Preferably, the buffering device is aligned with the inlet position of the outer cylinder connected with the compressor pipeline.

[0018] Preferably, a sealing gasket is arranged on the side of the baffle plate close to the piston at the edge position around the hole, so that the contact surface of the piston and the baffle plate is kept sealed when the piston abuts against the baffle plate, and the refrigerant is prevented from passing through the buffering device from the sliding groove.

[0019] Preferably, a compressor is arranged on the compressor pipeline, a fourth one-way valve is arranged on the bypass branch, a condenser is arranged on the condenser pipeline, an evaporator is arranged on the evaporator pipeline, a gas-liquid separator is arranged at the three-way connection of the evaporator pipeline, the bypass branch and the compressor pipeline, the inlet of the gas-liquid separator is connected with the evaporator pipeline, and the outlet of the gas-liquid separator is connected with the compressor pipeline and the bypass branch.

[0020] Preferably, the compressor pipeline is provided with a compressor, an exhaust temperature sensor, a high-pressure switch, an oil separator, a third filter, a first electromagnetic valve and a second check valve; the condenser pipeline is provided with a second high-pressure sensor, a second needle valve, a condenser, a first temperature sensor, a refrigerant radiator and a first check valve in sequence along the refrigerant transmission direction; the evaporator pipeline is provided with a first filter, a drying filter, a first stop valve, a first electronic expansion valve, an evaporator, a second stop valve, a second filter, a first needle valve, a suction temperature sensor and a first high-pressure sensor in sequence along the refrigerant transmission direction; the fluorine pump pipeline is provided with a liquid accumulator, a fluorine pump, a fluorine pump outlet pressure sensor and a third check valve; the starting end of the fluorine pump pipeline is connected to the pipeline between the first temperature sensor and the refrigerant radiator, and the terminal end of the bypass branch is connected to the pipeline between the first check valve and the first filter.

[0021] Preferably, the side of the mounting seat close to the spring is provided with a pressure sensor for detecting the pressure of the spring on the mounting seat.

[0022] Preferably, the position of the telescopic jacking rod on the buffer top cover or the liquid storage top cover is at the center position of the buffer top cover or the liquid storage top cover.

[0023] (Three) beneficial effects

[0024] Compared with the prior art, the present application provides a refrigerant circulating pump and compressor combined air-cooled variable frequency air conditioning system, which has the following beneficial effects:

[0025] 1. The refrigerant circulating pump and compressor combined air-cooled variable frequency air conditioning system, in the compressor refrigeration mode, the compressor pipeline is communicated with the buffer cavity, the bypass branch is communicated with the liquid storage cavity, and the refrigerant flows into the condenser pipeline from the compressor pipeline, the buffer cavity and the transition cavity; at this time, the refrigerant pressure in the liquid storage cavity is lower than that in the buffer cavity, so that the liquid storage cavity provides elasticity for the buffer device to play a buffering role; when switching to the circulating pump refrigeration mode, the inner cylinder rotates to exchange the positions of the buffer cavity and the liquid storage cavity, the bypass branch is communicated with the buffer cavity, and the compressor pipeline is communicated with the liquid storage cavity; the remaining high-pressure refrigerant in the compressor pipeline is filled into the liquid storage cavity to relieve the pressure, and the high-pressure refrigerant in the buffer cavity can increase the initial pressure of the pipeline when the fluorine pump starts, thereby reducing the starting energy consumption; and the pressure in the liquid storage cavity is higher than that in the buffer cavity under normal conditions, so that the buffer device no longer provides buffering, avoiding energy loss; that is, by providing the buffer cylinder, the compressor pipeline and the bypass branch are provided with the function of rapid switching of the pipeline, the buffering function in the compressor refrigeration mode, and the function of increasing the initial pressure of the pipeline when the fluorine pump starts.

[0026] 2、The air-cooled variable frequency air conditioning system combined with the refrigerant circulating pump and the compressor, when the piston slides to the side close to the buffer cavity, the elastic force of the baffle is determined by the pressure difference between the storage cavity and the buffer cavity, when the pressure in the buffer cavity increases suddenly, the piston slides to contact the baffle, the elastic force of the baffle is determined by the sum of the pressure difference between the storage cavity and the buffer cavity and the elastic force of the spring, so that the multi-stage buffering of the buffer device in the compressor refrigeration mode is realized, and the buffering force is determined by the refrigerant pressure in the circulating pump refrigeration mode, at the same time, the buffer device is pressed by the pressure difference and cannot slide in the circulating pump refrigeration mode, so that the loss of refrigerant power is avoided.

[0027] 3、The air-cooled variable frequency air conditioning system combined with the refrigerant circulating pump and the compressor, when the inner cylinder needs to rotate, the telescopic air cylinder controls the telescopic jacks to move away from the inner cylinder, so that the inner cylinder can rotate normally, when the size of the buffer cavity needs to be adjusted, the telescopic jacks at the corresponding position are controlled to press down the buffer top cover, so that the size of the buffer cavity is adjusted, for example, the volume of the buffer cavity is increased in the compressor refrigeration mode, and the volume of the buffer cavity is reduced in the circulating pump refrigeration mode, so that the buffer cavity volume is not too small to absorb pulse energy, and not too large to cause the increase of the refrigerant retention in the buffer cavity; when the refrigerant in the refrigeration system is insufficient, the second valve is opened at the same time, and the telescopic jacks at the corresponding position are controlled to press down the storage top cover, so that the refrigerant in the storage cavity is sprayed from the second valve into the transition cavity; when the pressure in the storage cavity is insufficient to affect the buffering capacity of the buffer device, the second valve is closed at the same time, and the telescopic jacks at the corresponding position are controlled to press down the storage top cover, so that the pressure of the refrigerant in the storage cavity is increased, so as to adapt to different working conditions.

[0028] 4、The air-cooled variable frequency air conditioning system combined with the refrigerant circulating pump and the compressor, by arranging a pressure sensor on the side of the mounting seat close to the spring, the pressure sensor can detect the movement of the baffle when the buffer device performs two-stage buffering, so as to monitor the refrigerant impact force in real time, when leakage occurs in the pipeline connected with the storage cavity, the pressure sensor can detect abnormal increase of the pressure, so as to issue an alarm. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the air conditioning system of the application.

[0030] Figure 2 It is a structural schematic diagram of the buffer cylinder 3 of the application.

[0031] Figure 3 It is a structural schematic diagram of the inner cylinder 32 of the application.

[0032] Figure 4 It is a sectional view of the buffer cylinder 3 of the application, which is in the compressor working mode.

[0033] Figure 5 It is a sectional view of the buffer cylinder 3 of the application, which is in the circulating pump working mode.

[0034] Figure 6 The exploded view of the inner cylinder 32 of the present application.

[0035] Figure 7 The partial enlarged view of the A area in the present application Figure 4

[0036] Figure 8 The sectional view of the buffer cylinder 3 of the present application, when the compressor is working, the telescopic cylinder 34 is adjusting the size of the buffer chamber 301 and the liquid storage chamber 302.

[0037] Figure 9 The perspective view of the inner cylinder 32 of the present application, the telescopic cylinder 34 is adjusting the size of the buffer chamber 301 and the liquid storage chamber 302.

[0038] In the figure: 11, evaporator pipeline; 12, compressor pipeline; 13, condenser pipeline;

[0039] 21, fluorine pump pipeline; 22, bypass branch;

[0040] 101, condenser; 102, first temperature sensor; 103, refrigerant radiator; 104, first check valve; 105, first filter; 106, drying filter; 107, first stop valve; 108, EXV1 throttle; 109, evaporator; 110, second stop valve; 111, second filter; 112, first needle valve; 113, suction temperature sensor; 114, first high pressure sensor; 115, gas-liquid separator; 116, compressor; 117, exhaust temperature sensor; 118, high pressure switch; 119, oil separator; 120, third filter; 121, first electromagnetic valve; 122, second check valve; 124, second high pressure sensor; 125, second needle valve;

[0041] 201, liquid storage tank; 202, fluorine pump; 203, fluorine pump outlet pressure sensor; 204, third check valve; 205, fourth check valve;

[0042] 3, buffer cylinder; 31, outer cylinder; 301, buffer chamber; 302, liquid storage chamber; 303, transition chamber; 32, inner cylinder; 321, partition plate; 322, rotating disc; 323, buffer top cover; 324, liquid storage top cover; 325, No. 1 valve; 326, No. 2 valve; 327, rotating motor; 3211, arc-shaped side plate; 3212, limiting block; 3213, mounting hole; 3214, sliding groove;

[0043] 33, buffer device; 331, piston; 332, baffle; 333, mounting seat; 3331, back hole; 3321, sealing gasket; 3322, spring; 3323, middle hole; ​

[0044] 34, telescopic cylinder; 341, telescopic ejector rod. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0046] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0047] In addition, fixed connection refers to the connection of parts or components after being fixed without any relative movement; transmission connection refers to a connection mode of transmitting mechanical movement or torque to other working components through a transmission member; sliding connection refers to a connection mode in which two objects are in contact but not fixed, and can slide relative to each other; and rotating connection refers to a connection mode in which two objects are in contact but not fixed, and can rotate relative to each other.

[0048] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0049] Embodiment one:

[0050] The embodiment provides a wind-cooled variable frequency air conditioning system combining a refrigerant circulating pump and a compressor, and has the following technical features.

[0051] Please refer to Figures 1-9The application discloses a wind-cooled variable frequency air conditioner system combining a refrigerant circulating pump with a compressor, which comprises a compressor pipeline 12, a condenser pipeline 13 and an evaporator pipeline 11 connected in sequence and forming a closed loop, a fluorine pump pipeline 21 connected in parallel between the condenser pipeline 13 and the evaporator pipeline 11, and a bypass branch 22 connected in parallel on the compressor pipeline 12, wherein the compressor pipeline 12, the condenser pipeline 13 and the evaporator pipeline 11 form a compressor refrigeration system, and the fluorine pump pipeline 21, the evaporator pipeline 11, the bypass branch 22 and the condenser pipeline 13 form a circulating pump refrigeration system; a buffer cylinder 3 is arranged at a three-way connection of the compressor pipeline 12, the bypass branch 22 and the condenser pipeline 13, the buffer cylinder 3 comprises an outer cylinder 31 and an inner cylinder 32, the inner cylinder 32 is rotationally arranged in the outer cylinder 31, the inner cylinder 32 comprises end covers and a middle partition plate 321 perpendicular to each other, the end covers divide the space in the outer cylinder 31 into an inner cavity of the inner cylinder 32 and a transition cavity 303, the middle partition plate 321 divides the inner cavity of the inner cylinder 32 into a buffer cavity 301 and a liquid storage cavity 302, the transition cavity 303 is communicated with the condenser pipeline 13, the buffer cavity 301 and the liquid storage cavity 302 are communicated with the compressor pipeline 12 and the bypass branch 22, a first valve 325 is arranged on the end cover at a position corresponding to the buffer cavity 301, a buffer device 33 is arranged on the middle partition plate 321, the buffer device 33 provides buffering for the buffer cavity 301, the liquid pressure in the liquid storage cavity 302 provides elasticity for the buffer device 33, and the position of the buffer cavity 301 and the liquid storage cavity 302 can be exchanged by rotating the inner cylinder 32, so that the chambers communicated with the compressor pipeline 12 and the bypass branch 22 are switched.

[0052] Through the above improvement, in the compressor refrigeration mode, the compressor pipeline 12 is communicated with the buffer cavity 301, the bypass branch 22 is communicated with the liquid storage cavity 302, and the refrigerant flows from the compressor pipeline 12, the buffer cavity 301 and the transition cavity 303 into the condenser pipeline 13, at this time, the refrigerant pressure in the liquid storage cavity 302 is lower than that in the buffer cavity 301, so that the liquid storage cavity 302 provides elasticity for the buffer device 33 to play a buffering role; when switched to the circulating pump refrigeration mode, the inner cylinder 32 is rotated to exchange the positions of the buffer cavity 301 and the liquid storage cavity 302, the bypass branch 22 is communicated with the buffer cavity 301, and the compressor pipeline 12 is communicated with the liquid storage cavity 302, the remaining high-pressure refrigerant in the compressor pipeline 12 is filled into the liquid storage cavity 302 to relieve the pressure, the high-pressure refrigerant in the buffer cavity 301 can increase the initial pipeline pressure when the fluorine pump starts, reduce the starting energy consumption, and the pressure in the liquid storage cavity 302 is higher than the pressure in the buffer cavity 301 under normal conditions, so that the buffer device 33 no longer provides buffering, thereby avoiding energy loss, that is, the buffer cylinder 3 is arranged to provide the functions of rapid switching of the compressor pipeline 12 and the bypass branch 22, buffering in the compressor refrigeration mode and increasing the initial pipeline pressure when the fluorine pump starts for the double-circulation system.

[0053] Further, the inner cylinder 32 comprises a partition 321 and a rotating disc 322, the partition 321 is fixed on the rotating disc 322, the rotating disc 322 is provided with a rotating shaft, the rotating shaft penetrates the end cover of the outer cylinder 31 and is connected to the output shaft of a rotating motor 327, the rotating motor 327 is fixed on the outer cylinder 31.

[0054] In an optional embodiment, the partition 321 is provided with a mounting hole 3213 at the position for mounting the buffering device 33, the buffering device 33 comprises a piston 331 and a baffle 332, the piston 331 is slidingly arranged in the mounting hole 3213, the mounting hole 3213 is provided with a sliding groove 3214 on the inner wall, the sliding groove 3214 is used to limit the sliding range of the baffle 332, the baffle 332 is provided with a spring 3322 on the side away from the piston 331, the other end of the spring 3322 is fixed on a mounting seat 333, the mounting seat 333 is mounted on the partition 321, the baffle 332 and the mounting seat 333 are respectively provided with a middle hole 3323 and a back hole 3331, when the piston 331 slides to the side close to the buffering cavity 301, the piston 331 is separated from the baffle 332.

[0055] Through the above improvement, when the piston 331 slides to the side close to the buffering cavity 301, the elastic force of the baffle 332 is determined by the pressure difference between the liquid storage cavity 302 and the buffering cavity 301, when the pressure in the buffering cavity 301 suddenly increases, the piston 331 slides to contact the baffle 332, the elastic force of the baffle 332 is determined by the sum of the pressure difference between the liquid storage cavity 302 and the buffering cavity 301 and the elastic force of the spring 3322, thereby realizing the multi-stage buffering of the buffering device 33 in the compressor refrigeration mode, and the buffering force is determined by the refrigerant pressure in the circulating pump refrigeration mode, at the same time, the buffering device 33 is pressed by the pressure difference and cannot slide in the circulating pump refrigeration mode, thereby avoiding the loss of refrigerant power.

[0056] Further, the mounting seat 333 is fixed on the side of the partition 321 close to the liquid storage cavity 302 by means of bolts, threads or welding.

[0057] Further, the mounting hole 3213 is provided with a limiting step at the end close to the buffering cavity 301, which is used to limit the sliding of the piston 331 in the mounting hole 3213.

[0058] In an optional embodiment, the end cover of the inner cylinder 32 comprises a buffering top cover 323 and a liquid storage top cover 324, the buffering top cover 323 slides on the side of the partition 321 corresponding to the buffering cavity 301, the liquid storage top cover 324 slides on the side of the partition 321 corresponding to the liquid storage cavity 302, a first valve 325 is arranged on the buffering top cover 323, and a second valve 326 is arranged on the liquid storage top cover 324.

[0059] Two telescopic cylinders 34 are further arranged on the outer cylinder 31, and the telescopic jacks 341 of the two telescopic cylinders 34 are respectively arranged on the buffer cover 323 and the liquid storage cover 324 to slide up and down.

[0060] Through the above improvement, when the inner cylinder 32 needs to rotate, the telescopic jacks 341 of the telescopic cylinders 34 are controlled to move away from the inner cylinder 32, so that the inner cylinder 32 can rotate normally. When the size of the buffer cavity 301 needs to be adjusted, the telescopic jacks 341 at the corresponding positions are controlled to press down the buffer cover 323, so as to adjust the size of the buffer cavity 301. For example, in the compressor refrigeration mode, the volume of the buffer cavity 301 is increased, and in the circulating pump refrigeration mode, the volume of the buffer cavity 301 is reduced, so as to avoid that the volume of the buffer cavity 301 is too small to absorb pulse energy or too large to cause an increase in the amount of refrigerant retained in the buffer cavity. When the refrigerant in the refrigeration system is insufficient, the second valve 326 is opened, and the telescopic jacks 341 at the corresponding positions are controlled to press down the liquid storage cover 324, so that the refrigerant in the liquid storage cavity 302 is sprayed from the second valve 326 into the transition cavity 303. When the pressure in the liquid storage cavity 302 is insufficient to affect the buffering capacity of the buffer device 33, the second valve 326 is closed, and the telescopic jacks 341 at the corresponding positions are controlled to press down the liquid storage cover 324, so as to increase the pressure of the refrigerant in the liquid storage cavity 302, thereby adapting to different working conditions.

[0061] Further, the first valve 325 and the second valve 326 are one-way electromagnetic valves.

[0062] Further, the end of the partition plate 321 close to the transition cavity 303 is provided with a limiting block 3212 for limiting the sliding of the buffer cover 323 and the liquid storage cover 324 in the inner cylinder 32.

[0063] Further, the two telescopic cylinders 34 are fixedly installed on the end cover of the outer cylinder 31, and the two telescopic jacks 341 pass through the end cover of the outer cylinder 31.

[0064] In an optional embodiment, the partition plate 321 is provided with an arc-shaped side plate 3211 on the side surface close to the inner wall of the outer cylinder 31, and the width of the arc-shaped side plate 3211 is greater than the size of the refrigerant inlet of the compressor pipeline 12 and the bypass branch 22.

[0065] In an optional embodiment, the buffer device 33 is positioned to align with the inlet position of the compressor pipeline 12 communicating with the outer cylinder 31.

[0066] In an optional embodiment, the baffle 332 is provided with a sealing gasket 3321 at the edge position around the middle hole 3323 on the side close to the piston 331, so that when the piston 331 is attached to the baffle 332, the contact surface of the piston 331 and the baffle 332 is kept sealed, avoiding the refrigerant from passing through the buffer device 33 from the sliding groove 3214.

[0067] In an alternative embodiment, the compressor pipeline 12 is provided with a compressor 116, the bypass branch 22 is provided with a fourth one-way valve 205, the condenser pipeline 13 is provided with a condenser 101, the evaporator pipeline 11 is provided with an evaporator 109, a three-way joint of the evaporator pipeline 11, the bypass branch 22 and the compressor pipeline 12 is provided with a gas-liquid separator 115, an inlet of the gas-liquid separator 115 is connected with the evaporator pipeline 11, and an outlet of the gas-liquid separator 115 is connected with the compressor pipeline 12 and the bypass branch 22.

[0068] In an alternative embodiment, the compressor pipeline 12 is provided with a compressor 116, an exhaust temperature sensor 117, a high-pressure switch 118, an oil separator 119, a third filter 120, a first electromagnetic valve 121 and a second one-way valve 122; the condenser pipeline 13 is provided, in sequence along a refrigerant transmission direction, with a second high-pressure sensor 124, a second needle valve 125, a condenser 101, a first temperature sensor 102, a refrigerant radiator 103 and a first one-way valve 104; the evaporator pipeline 11 is provided, in sequence along a refrigerant transmission direction, with a first filter 105, a drying filter 106, a first stop valve 107, a first electronic expansion valve 108, an evaporator 109, a second stop valve 110, a second filter 111, a first needle valve 112, a suction temperature sensor 113 and a first high-pressure sensor 114; the fluorine pump pipeline 21 is provided with a liquid accumulator 201, a fluorine pump 202, a fluorine pump outlet pressure sensor 203 and a third one-way valve 204; a starting end of the fluorine pump pipeline 21 is connected to a pipeline between the first temperature sensor 102 and the refrigerant radiator 103, and an ending end of the bypass branch 22 is connected to a pipeline between the first one-way valve 104 and the first filter 105.

[0069] In an alternative embodiment, the mounting seat 333 is provided, near one side of the spring 3322, with a pressure sensor for detecting a pressure of the spring 3322 on the mounting seat 333.

[0070] The improved pressure sensor can detect movement of the baffle 332 when the secondary buffering of the buffering device 33 is performed, so as to monitor the refrigerant impact force in real time. When a leakage occurs in a pipeline in communication with the liquid storage cavity 302, the pressure sensor can detect abnormal increase of pressure, so as to issue an alarm.

[0071] In an alternative embodiment, a position of the telescopic top rod 341 on the buffering top cover 323 or the liquid storage top cover 324 is located at a central position of the buffering top cover 323 or the liquid storage top cover 324.

[0072] Further, the fluorine pump pipeline 21 is further provided with a second electromagnetic valve, which is located between the fluorine pump 202 and the third one-way valve 204, and is used to control the opening and closing of the fluorine pump pipeline 21.

[0073] Further, the condenser 101 is provided with a cooling fan on one side, which is arranged opposite to the condenser 101, and is used to enhance the heat dissipation effect of the condenser 101.

[0074] Further, a sealing element is arranged between the outer cylinder 31 and the inner cylinder 32, which is made of rubber material resistant to corrosion of refrigerant, and is used to prevent refrigerant from leaking from the gap between the outer cylinder 31 and the inner cylinder 32.

[0075] Further, the contact part of the telescopic top rod 341 and the buffer top cover 323 and the liquid storage top cover 324 is provided with a wear-resistant pad made of polytetrafluoroethylene material to reduce the wear between the telescopic top rod 341 and the top cover.

[0076] Further, the gas-liquid separator 115 is provided with a filter screen inside, which is used to filter impurities in the refrigerant and prevent impurities from entering the compressor 116 and the fluorine pump 202 to cause damage.

[0077] Further, the temperature sensor is arranged on the shell of the compressor 116, which is used to monitor the shell temperature of the compressor 116 in real time, and when the temperature exceeds the preset threshold value, the system automatically sends an alarm signal and takes measures to reduce the frequency or stop running.

[0078] Further, the outer wall of the outer cylinder 31 is provided with a thermal insulation layer made of polyurethane foaming material with a thickness of 20-30mm, which is used to reduce the heat exchange between the inside and outside of the buffer cylinder 3 and avoid the refrigerant temperature fluctuation too large.

[0079] Further, the telescopic cylinder 34 is provided with a stroke sensor, which is used to accurately monitor the telescopic amount of the telescopic top rod 341, so as to accurately control the positions of the buffer top cover 323 and the liquid storage top cover 324, and to realize the accurate adjustment of the volumes of the buffer cavity 301 and the liquid storage cavity 302.

[0080] Further, the fluorine pump 202 is provided with a pressure sensor at the inlet, which is used to monitor the refrigerant pressure at the inlet of the fluorine pump 202, and when the pressure is lower than the preset value, the system automatically controls the fluorine pump 202 to reduce the speed or stop running to protect the fluorine pump 202 from being damaged.

[0081] Further, the connection between the rotating shaft of the inner cylinder 32 and the outer cylinder 31 is provided with a mechanical sealing device, which includes a dynamic ring and a static ring, the dynamic ring is fixedly connected with the rotating shaft, the static ring is fixedly connected with the outer cylinder 31, and the dynamic ring and the static ring are sealed by pre-tightening force of a spring to prevent leakage of refrigerant.

[0082] Further, a wind speed sensor is arranged at the air outlet of the evaporator 109 to monitor the air outlet speed of the evaporator 109, when the wind speed is lower than a preset value, the system automatically judges that the evaporator 109 may be blocked, and sends a prompt information.

[0083] Further, the edge of the buffer top cover 323 and the liquid storage top cover 324 is provided with a guide groove, and the middle partition plate 321 is correspondingly provided with a guide column, the guide groove is slidingly arranged on the guide column, and the buffer top cover 323 and the liquid storage top cover 324 are arranged to slide along a straight line stably.

[0084] Further, a liquid mirror is arranged on the pipeline between the first electronic expansion valve 108 and the evaporator 109, which is used to observe the flow state and liquid level of the refrigerant, so as to find the abnormality in the system in time.

[0085] Further, a torque sensor is arranged on the output shaft of the rotary motor 327, which is used to monitor the torque when the rotary motor 327 drives the inner cylinder 32 to rotate, when the torque exceeds a preset range, the system automatically stops the operation of the rotary motor 327 and performs fault diagnosis.

[0086] Working principle: the system is divided into two independent refrigerant circulation flow mode, respectively, the circulating pump fluorine pump 202 refrigeration mode and compressor refrigeration mode; fluorine pump 202 operation, low temperature liquid refrigerant is discharged by fluorine pump 202 export through the third check valve 204, through the first electronic expansion valve 108 to absorb indoor heat evaporation, the refrigerant after evaporation, become gas refrigerant to the outdoor side, through the outdoor low temperature air heat exchange condensation into liquid refrigerant, then through the fluorine pump 202 inlet, forming a circulating flow; fluorine pump 202 export increases fluorine pump outlet pressure sensor 203, through the high pressure sensor and fluorine pump 202 outlet pressure sensor differential pressure, fluorine pump 202 operation state monitoring. According to the differential pressure on fluorine pump 202 corresponding control and protection; the third check valve 204 and the fourth check valve 205 function is to prevent the reverse flow of refrigerant, causing refrigerant circulation short circuit when the compressor operation mode; the first check valve 104 and the second check valve 122 function is to prevent the reverse flow of refrigerant, causing refrigerant circulation short circuit when the fluorine pump 202 operation mode; special gas-liquid separator 115, to ensure that the compressor 116 operation is the gas compressor suction. Fluorine pump 202 operation, gas-liquid separator does not store liquid, to ensure that there are more refrigerant to participate in heat exchange cycle; liquid accumulator 201 for ensuring the fluorine pump 202 suction liquid refrigerant, to ensure the stable and reliable operation of fluorine pump 202.

[0087] The air-cooled variable frequency air conditioning system realizes high-efficiency operation of two modes of compressor refrigeration and circulating pump refrigeration through the combination of the compressor 116 and the refrigerant circulating pump (fluorine pump 202), and mode switching and pressure regulation are completed relying on the structural design of the buffer cylinder 3. In the compressor refrigeration mode, the inner cylinder 32 in the buffer cylinder 3 is at the initial position, the compressor pipeline 12 is communicated with the buffer cavity 301, and the bypass branch 22 is communicated with the liquid storage cavity 302. The refrigerant enters the buffer cavity 301 through the compressor pipeline 12, and then flows into the condenser pipeline 13 through the transition cavity 303; at this time, the pressure in the liquid storage cavity 302 is lower than that in the buffer cavity 301, the refrigerant in the liquid storage cavity 302 provides elastic force for the buffer device 33, the buffer device 33 absorbs the pulse pressure in the refrigerant flow, and stable buffering is realized. When switched to the circulating pump refrigeration mode, the inner cylinder 32 rotates to make the buffer cavity 301 and the liquid storage cavity 302 exchange positions, the bypass branch 22 is communicated with the buffer cavity 301, and the compressor pipeline 12 is communicated with the liquid storage cavity 302. The remaining high-pressure refrigerant in the compressor pipeline 12 enters the liquid storage cavity 302 to relieve the pipeline pressure; the high-pressure refrigerant in the buffer cavity 301 increases the initial pressure of the pipeline when the fluorine pump 202 starts, reduces the starting energy consumption, and at the same time, the pressure in the liquid storage cavity 302 is higher than that in the buffer cavity 301, so that the buffer device 33 is pressed and cannot slide, thereby avoiding energy loss. In addition, the buffer cylinder 3 adjusts the positions of the buffer top cover 323 and the liquid storage top cover 324 through the telescopic air cylinder 34, can flexibly change the volumes of the buffer cavity 301 and the liquid storage cavity 302, and adapts to the buffering requirements and refrigerant quantity adjustment under different working conditions; the multi-stage buffering design (depending on the pressure difference and the elastic force of the spring 3322) of the buffer device 33 further improves the stability during compressor refrigeration.

[0088] It should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0089] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous modifications and changes can be made to the embodiments without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A refrigerant circulating pump combined with a compressor in an air-cooled variable frequency air conditioning system, comprising a compressor pipeline (12), a condenser pipeline (13), and an evaporator pipeline (11) connected in sequence to form a closed loop, wherein a refrigerant pump pipeline (21) is connected in parallel between the condenser pipeline (13) and the evaporator pipeline (11), and a bypass branch (22) is connected in parallel to the compressor pipeline (12), characterized in that: A buffer cylinder (3) is provided at the tee connection of the compressor pipeline (12), bypass branch (22) and condenser pipeline (13). The buffer cylinder (3) includes an outer cylinder (31) and an inner cylinder (32). The inner cylinder (32) is rotatably disposed inside the outer cylinder (31). The inner cylinder (32) includes mutually perpendicular end caps and a middle partition (321). The end caps divide the space inside the outer cylinder (31) into an inner cavity of the inner cylinder (32) and a transition cavity (303). The middle partition (321) divides the inner cavity of the inner cylinder (32) into a buffer cavity (301) and a liquid storage cavity (302). The transition cavity (303) is connected to the condenser pipeline (13). The buffer cavity (301) and the liquid storage cavity (302) are connected to the compressor pipeline (12) and the bypass branch (22). A valve (325) is provided on the end cap at the position corresponding to the buffer chamber (301), and a buffer device (33) is provided on the partition plate (321), which provides buffer for the buffer chamber (301).

2. The air-cooled inverter air conditioning system combining a refrigerant circulation pump and a compressor according to claim 1, characterized in that, The partition plate (321) has a mounting hole (3213) at the position for mounting the buffer device (33). The buffer device (33) includes a piston (331) and a baffle (332) slidably disposed in the mounting hole (3213). A groove (3214) is provided on the inner wall of the mounting hole (3213). The groove (3214) is used to limit the sliding range of the baffle (332). A spring (3322) is provided on the side of the baffle (332) away from the piston (331). The other end of the spring (3322) is fixed on the mounting base (333). The mounting base (333) is installed on the middle partition (321). The baffle (332) and the mounting base (333) are respectively provided with a central hole (3323) and a back hole (3331). When the piston (331) slides to the side close to the buffer chamber (301), the piston (331) disengages from the baffle (332).

3. The air-cooled inverter air conditioning system combining a refrigerant circulation pump and a compressor according to claim 2, characterized in that, The end cap of the inner cylinder (32) includes a split buffer top cover (323) and a liquid storage top cover (324). The buffer top cover (323) slides on the side of the middle partition (321) corresponding to the buffer cavity (301), and the liquid storage top cover (324) slides on the side of the middle partition (321) corresponding to the liquid storage cavity (302). The first valve (325) is provided on the buffer top cover (323), and the second valve (326) is provided on the liquid storage top cover (324). Two telescopic cylinders (34) are also provided on the outer cylinder (31). The telescopic top rods (341) of the two telescopic cylinders (34) slide up and down on the buffer top cover (323) and the liquid storage top cover (324), respectively.

4. The air-cooled inverter air conditioning system combining a refrigerant circulation pump and a compressor according to claim 1, characterized in that, The partition plate (321) has an arc-shaped side plate (3211) on the side that fits the inner wall of the outer cylinder (31). The width of the arc-shaped side plate (3211) is greater than the size of the refrigerant inlet of the compressor pipeline (12) and the bypass branch (22).

5. The air-cooled inverter air conditioning system combining a refrigerant circulation pump and a compressor according to claim 2, characterized in that, The position of the buffer device (33) is aligned with the inlet of the compressor pipeline (12) connecting to the outer cylinder (31).

6. The air-cooled inverter air conditioning system combining a refrigerant circulation pump and a compressor according to claim 2, characterized in that, The baffle (332) near the piston (331) has a sealing gasket (3321) at the edge of the central hole (3323) so that when the piston (331) is attached to the baffle (332), the contact surface between the piston (331) and the baffle (332) remains sealed, preventing the refrigerant from passing through the buffer device (33) from the groove (3214).

7. The air-cooled inverter air conditioning system combining a refrigerant circulation pump and a compressor according to claim 1, characterized in that, A compressor (116) is installed on the compressor pipeline (12), a fourth check valve (205) is installed on the bypass branch (22), a condenser (101) is installed on the condenser pipeline (13), an evaporator (109) is installed on the evaporator pipeline (11), and a gas-liquid separator (115) is installed at the T-junction of the evaporator pipeline (11), the bypass branch (22) and the compressor pipeline (12). The inlet of the gas-liquid separator (115) is connected to the evaporator pipeline (11), and the outlet of the gas-liquid separator (115) is connected to the compressor pipeline (12) and the bypass branch (22).

8. The air-cooled inverter air conditioning system combining a refrigerant circulation pump and a compressor according to claim 7, characterized in that, The compressor pipeline (12) is equipped with a compressor (116), an exhaust temperature sensor (117), a high-pressure switch (118), an oil separator (119), a third filter (120), a first solenoid valve (121), and a second check valve (122); the condenser pipeline (13) is equipped with a second high-pressure sensor (124), a second needle valve (125), a condenser (101), a first temperature sensor (102), a refrigerant radiator (103), and a first check valve (104) in sequence along the refrigerant transmission direction. The evaporator pipeline (11) is provided with a first filter (105), a dryer filter (106), a first shut-off valve (107), a first electronic expansion valve (108), an evaporator (109), a second shut-off valve (110), a second filter (111), a first needle valve (112), a suction temperature sensor (113), and a first high-pressure sensor (114) in sequence along the refrigerant transmission direction. The fluorine pump pipeline (21) is equipped with a reservoir (201), a fluorine pump (202), a fluorine pump outlet pressure sensor (203), and a third check valve (204); the starting end of the fluorine pump pipeline (21) is connected to the pipeline between the first temperature sensor (102) and the refrigerant radiator (103), and the ending end of the bypass branch (22) is connected to the pipeline between the first check valve (104) and the first filter (105).

9. A refrigerant circulation pump and compressor combined air-cooled inverter air conditioning system according to claim 2, characterized in that, A pressure sensor is provided on the side of the mounting base (333) near the spring (3322) to detect the pressure of the spring (3322) on the mounting base (333).

10. A refrigerant circulation pump and compressor combined air-cooled inverter air conditioning system according to claim 3, characterized in that, The telescopic top rod (341) is positioned at the center of the buffer top cover (323) or the liquid storage top cover (324) when it rests on the buffer top cover (323) or the liquid storage top cover (324).

Images