CN217110102U

CN217110102U - Air-conditioning refrigeration system

Info

Publication number: CN217110102U
Application number: CN202220554914.2U
Authority: CN
Inventors: 黄玉优; 李东涛; 林海佳; 赖桃辉; 秦海燕; 赵材波
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2022-08-02
Anticipated expiration: 2032-03-14

Abstract

The utility model provides an air conditioner refrigerating system, including connecting formation refrigeration cycle's compressor, condenser, throttling element, evaporimeter in order, still include the oil separator, the oil separator is connected between the gas vent of compressor and the air inlet of condenser, still includes the sprayer, and the sprayer can be atomized in the exit of sprayer with hydrops in the evaporimeter and oil separator's oil return under the effect of the pressure differential between breathing in of oil separator's oil return and compressor. According to the utility model discloses, adopt the sprayer to replace the air conditioner refrigerating system's among the prior art capillary, the expansion work of the throttle step-down during the oil return obtains abundant recycle, utilizes the injection mouth suction of sprayer to draw simultaneously and penetrates the liquid in the evaporimeter, effectively overcomes the evaporimeter bottom when the system is more energy-conserving and easily appears the not enough of stock solution phenomenon, prevents that the liquid compression of compressor or the liquid that breathes in from hitting the phenomenon and taking place.

Description

Air-conditioning refrigeration system

Technical Field

The utility model belongs to the technical field of air conditioning, concretely relates to air conditioner refrigerating system.

Background

In the existing vapor compression refrigeration cycle, a compressor is an important part and is used as a power source for flowing of a refrigerant in a system cycle, and the compressors in most refrigeration cycles need sufficient lubrication, so that the lubrication of moving parts such as a crankshaft, a bearing, a connecting rod and the like is ensured, and the sealing of a moving surface in a compression chamber can be enhanced. However, lubricating oil and refrigerant are mutually soluble and separated, so that lubricating oil is easy to stay in a refrigeration system, and sufficient backflow amount of the lubricating oil cannot be realized in some severe operating conditions, so that the compressor runs in an oil-deficient manner, the efficiency is reduced, the compressor is easy to overheat, the cylinder is damaged, and the like.

The reasons for unsmooth oil return are many, the structural design has oil return dead corners, the low flow rate of the low-frequency operation refrigerant cannot carry more oil to return to the compressor, the flow rate of the branch at the bottom of the gas collecting pipe is low, the oil return is insufficient, and the like.

In the design of a common air-conditioning refrigeration system, an oil separator is adopted to separate lubricating oil (also called as freezing oil) in high-pressure exhaust in advance, and the separated lubricating oil is led to return to an air suction pipeline of a compressor in advance under the action of high-pressure and low-pressure differential pressure through structures such as an oil return capillary tube and the like, so that the flow of the lubricating oil flowing at other positions in the refrigeration system is very small, and the compressor is ensured to have good lubrication. But the oil return capillary tube throttles and reduces pressure to lose expansion work, which is not beneficial to system energy conservation; in a refrigeration system without a gas-liquid separator, in order to prevent liquid refrigerant in an evaporator from entering a compressor, a return air manifold is usually connected above the highest possible liquid level in a gas collecting manifold of the evaporator, but this easily causes the liquid refrigerant and lubricating oil to be easily stored in the bottom of the gas collecting manifold, because the refrigerant flow of a bottom branch is small, the flow rate is low, and cannot carry enough liquid refrigerant and/or lubricating oil to flow upwards, the liquid refrigerant and the retained part of lubricating oil are easily accumulated at the bottom of the gas collecting manifold after the operation time is too long, when the liquid level gradually rises, a liquid seal is easily formed on the bottom branch, the flow of the refrigerant which can pass through is less, and thus a liquid storage phenomenon is formed at the bottom of the evaporator, obviously, more lubricating oil is also stored in the liquid refrigerant, and the refrigerant circulation quantity of the refrigeration system is easily insufficient, and, And oil return is insufficient.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides an air conditioner refrigerating system can overcome among the prior art air conditioner refrigerating system and adopt return oil capillary throttle step-down loss expansion work, is unfavorable for the system energy-conservation, and the not enough of stock solution phenomenon easily appears in the evaporimeter bottom.

In order to solve the problem, the utility model provides an air-conditioning refrigeration system, including compressor, condenser, throttling element, evaporimeter, compressor, condenser, throttling element, evaporimeter connect in order and form refrigeration cycle, air-conditioning refrigeration system still includes the oil separator, the oil separator connect in the gas vent of compressor with between the air inlet of condenser, still include the sprayer, the sprayer can the oil separator's oil return with under the effect of the pressure differential between breathing in of compressor will hydrops in the evaporimeter reaches the oil return of oil separator is in the exit of sprayer atomizes.

In some embodiments, a filter is disposed between the first inlet of the ejector and the oil return of the oil separator.

In some embodiments, a one-way valve is provided on the first conduit between the second inlet of the ejector and the header of the evaporator.

In some embodiments, a capillary tube is further disposed on the first pipeline.

In some embodiments, the first conduit includes an intake tube section in communication with a bottom of the header, the intake tube section extending above the bottom.

In some embodiments, a solenoid valve is provided in the line between the outlet of the ejector and the suction inlet of the compressor.

In some embodiments, the compressor is on the indoor side.

The utility model provides a pair of air conditioner refrigerating system adopts the ejector to replace the air conditioner refrigerating system's among the prior art capillary, and the expansion work of the throttle step-down during the oil return obtains abundant recycle, utilizes the injection port suction of ejector to draw the liquid in the evaporimeter, effectively overcomes the evaporimeter bottom when the system is more energy-conserving and easily appears the not enough of stock solution phenomenon, prevents that the liquid compression of compressor or the liquid that breathes in from hitting the phenomenon and taking place.

Drawings

Fig. 1 is a schematic diagram of an air conditioning refrigeration system according to an embodiment of the present invention.

The reference numerals are represented as:

1. a compressor; 2. a condenser; 21. a gas distributing pipe; 22. a liquid collecting pipe; 3. a throttling element; 4. an evaporator; 41. a gas collecting pipe; 42. a liquid separation head; 43. a branch liquid separating pipe; 5. an oil separator; 6. an ejector; 71. a filter; 72. a one-way valve; 73. a capillary tube; 74. an electromagnetic valve; 75. a forked tube.

Detailed Description

Referring to fig. 1, according to the embodiment of the present invention, an air-conditioning refrigeration system is provided, including compressor 1, condenser 2, throttling element 3 (specifically expansion valve), evaporator 4, compressor 1, condenser 2, throttling element 3, evaporator 4 connect in order and form refrigeration cycle, air-conditioning refrigeration system further includes oil separator 5, oil separator 5 connect in between the gas vent of compressor 1 and the air inlet of condenser 2, still include sprayer 6, sprayer 6 can be in the oil return of oil separator 5 with the oil return of oil separator 5 is in under the effect of the pressure difference between the breathing in of compressor 1 the hydrops in evaporator 4 and the oil return of oil separator 5 is in the exit of sprayer 6 atomizes, and the oil gas after atomizing is inhaled in compressor 1. In the technical scheme, high-pressure refrigeration oil (also called lubricating oil) at an oil return port of the oil separator 5 enters a nozzle from a first inlet of the ejector 6 to reduce pressure and increase speed, a negative pressure area is generated around the nozzle, namely a second inlet sucks accumulated liquid in the evaporator 4 into the nozzle, and the return oil and the accumulated liquid are atomized at an outlet of the ejector 6 to enter the compressor 1, namely, the ejector 6 is adopted to replace a capillary tube of an air-conditioning refrigeration system in the prior art, the expansion work of throttling and reducing pressure during oil return is fully recycled, and meanwhile, the injection port (namely the second inlet) of the ejector 6 is utilized to suck and inject liquid (liquid refrigerant or refrigeration oil or a mixture of the liquid refrigerant and the refrigeration oil) in the evaporator 4, so that the system effectively overcomes the defect that the liquid storage phenomenon easily occurs at the bottom of the evaporator 4 while saving more energy, the liquid compression or suction liquid slugging phenomenon of the compressor 1 is prevented from occurring.

In some embodiments, a filter 71 is disposed between the first inlet of the ejector 6 and the oil return port of the oil separator 5, so as to filter the return oil of the oil separator 5 and prevent impurities mixed therein from blocking the ejector 6.

A check valve 72 is disposed on a first pipeline between the second inlet (i.e., the injection port) of the ejector 6 and the gas collecting pipe 41 of the evaporator 4, so as to prevent high-pressure refrigerant oil or refrigerant gas from reversely flowing into the evaporator 4 through the ejector 6. Still be equipped with capillary 73 on the first pipeline, can be right effusion in the evaporimeter 4 realizes the throttle step-down, controls liquid volume through the capillary 73 of the suitable pipe diameter of establishing ties.

In some embodiments, the first pipeline includes an introducing pipe section communicated with the bottom of the gas collecting pipe 41, and the introducing pipe section extends above the bottom of the pipe to prevent impurities remaining at the bottom of the gas collecting pipe 41 from entering the liquid return pipe (i.e., the first pipeline) to cause blockage.

In some embodiments, a solenoid valve 74 is disposed on a pipeline between the outlet of the ejector 6 and the suction port of the compressor 1, and the solenoid valve 74 can be controlled to be opened or closed according to a specific design rule, so as to achieve control of oil return. For example, when the solenoid valve 74 is opened (i.e., turned on) as required by the operation of the system, the liquid in the evaporator 4 and/or the bottom of the gas collecting pipe 41 is atomized and returned to the compressor under the action of differential pressure suction, and when the air-conditioning refrigeration system is stopped or the return of the liquid is not required, the solenoid valve 74 is controlled to be closed (i.e., turned off) to prevent the liquid from entering the compressor to cause suction liquid slugging or liquid compression.

The air-conditioning refrigeration system shown in fig. 1 is particularly suitable for air-conditioning in a precision machine room, and specifically, a compressor 1, an evaporator 4, a throttling element 3, an indoor fan and the like of the system are placed on an indoor unit (indoor side), a condenser 2, a corresponding outdoor fan and the like are placed on an outdoor unit (outdoor side), and the indoor unit and the outdoor unit are connected through a connecting pipe for use. Because the air conditioner of the precise machine room operates in a refrigeration working condition all the year round, the gas collecting pipe 41 of the evaporator 4 is very suitable for using the liquid return design scheme at the bottom of the gas collecting pipe 41, and the liquid return pipe assembly (namely the first pipeline) needs to be connected with a shorter pipeline flow, so that the pressure difference can be fully utilized. If the compressor is placed in the outdoor unit, the liquid return pipe needs to be connected to the outdoor unit from the indoor unit, namely an indoor and outdoor connecting pipe is added, the connecting pipe belongs to an engineering installation part, the length, the pipe arrangement and the like of the connecting pipe need to be flexibly designed according to the field, the liquid return pipe belongs to a precisely designed pipeline part, the length, the pipe diameter and the like cannot be randomly changed, and otherwise the liquid return effect can be influenced, so that the technical scheme is more suitable for a refrigerating system with the compressor and the evaporator arranged nearby. That is, in a preferred embodiment, the compressor 1 is on the indoor side.

According to the utility model discloses an embodiment still provides an air conditioner refrigerating system's control method for control foretell air conditioner refrigerating system, include: acquiring a control instruction; and controlling the on-off of the electromagnetic valve 74 according to the control command. Specifically, when the control instruction is that the return oil is returned to the liquid and opened, the electromagnetic valve 74 is controlled to be switched on; and when the control command is oil return and liquid return stop, controlling the electromagnetic valve 74 to be cut off.

Specifically, for example, when the air conditioning refrigeration system is started and operated, the electromagnetic valve 74 is opened as needed, so that the high-pressure refrigeration oil or refrigerant in the oil separator 5 enters the ejector 6 to reduce the pressure and increase the speed, and the liquid at the bottom of the gas collecting pipe 41 is sucked and ejected, and the two are mixed and then enter the gas suction pipe, and then completely mixed with the refrigerant gas returned by the gas collecting pipe 41 and enter the gas suction port of the compressor. The opening of the electromagnetic valve may require oil return, and may also require pumping the accumulated liquid at the bottom of the evaporator and the gas collecting pipe: high-pressure refrigerant gas at the oil separator 5 is used as a power source to enter the ejector 6, high-temperature and high-pressure refrigerant passes through the nozzle and then is accelerated and depressurized, and a negative pressure area is generated around the nozzle, so that accumulated liquid at the bottom of the suction gas collecting pipe 41 is ejected.

When the air-conditioning refrigeration system is shut down or oil return is not needed, the electromagnetic valve is closed, so that liquid can be prevented from entering the air suction pipe of the compressor. The check valve 72 prevents the high-pressure refrigerant oil or gas from flowing backward through the ejector 6 to the header 41 when the solenoid valve is closed.

When the refrigeration load is smaller, the compressor generally operates at low frequency, the circulating quantity of the refrigerant in the refrigeration system is smaller, and surplus refrigerant exists, so that the time interval between oil return and liquid return can be longer. However, when the low-frequency operation time is too long, the compressor may have an oil shortage problem, so that the high-frequency operation is performed to realize oil return; the surplus refrigerant at low frequency can accumulate at the bottom of the evaporator 4 and/or at the bottom of the header 41, since the solenoid valve 74 is closed and no flow to the compressor is possible, thereby ensuring proper refrigerant circulation amount at low frequency operation without excess. Therefore the utility model discloses realize back liquid and oil return function simultaneously, be the simplification control scheme of a preferred to air conditioner refrigerating system.

When the solenoid valve is closed, the check valve 72 prevents the refrigerant oil separated in the oil separator 5 from entering the bottom of the header 41 through the capillary tube 73. At this time, the outlet of the check valve 72 is in a high pressure state (the capillary tube is not throttled when no fluid flows, and the inlet and the outlet of the capillary tube 73 are in a pressure balance state), and the inlet of the check valve 72 is in a low pressure state, so that the check valve 72 is in a reverse cut-off closing state, and no refrigerant or refrigeration oil flows.

A specific embodiment of the system configuration of the air conditioning refrigeration system of the present invention is described below with reference to fig. 1:

the compressor 1, the oil separator 5, the condenser 2, the expansion valve, and the evaporator 4 are connected in sequence to form a closed refrigeration cycle. The condenser 2 has a gas distribution pipe 21 and a liquid collection pipe 22, the evaporator 4 has a liquid distribution head 42, a liquid distribution branch pipe 43 and a gas collection pipe 41, an oil return line of the oil separator 5 is connected to a gas suction pipe of the compressor 1, and an electromagnetic valve 74 for controlling oil return is connected to the oil return line. A filter 71 is connected to an inlet pipeline between the oil return pipeline and the electromagnetic valve 74; the suction port of the compressor 1 is connected to a merging outlet of a fork 75 (merging tee), and two inlet ports of the fork 75 are connected to a suction pipe and an outlet of the solenoid valve 74, respectively.

An exhaust port of the compressor is connected to a gas distribution pipe 21 of the condenser 2 through an oil separator 5, the gas distribution pipe 21 distributes high-temperature and high-pressure refrigerant gas to each branch in the condenser 2 through a plurality of gas distribution branch pipes, phase change condensation and liquefaction are realized in the condenser 2, the high-temperature and high-pressure refrigerant gas is collected to a liquid collection pipe 22 through the liquid collection branch pipes, a main outlet of the liquid collection pipe 22 is connected to an inlet of an expansion valve, the high-pressure refrigerant is throttled, cooled and depressurized through the expansion valve, and an outlet of the expansion valve is connected to a liquid distribution head 42; the liquid distributing head 42 is connected with a plurality of incomplete same liquid distributing branch pipes 43, each liquid distributing branch pipe 43 distributes low-temperature and low-pressure refrigerant to each branch of the evaporator 4, phase change evaporation and gasification are realized in the evaporator 4, the refrigerant is collected to the gas collecting pipe 41 through the gas collecting branch pipes, the total outlet of the gas collecting pipe 41 is connected to the gas suction pipe, and the gas suction pipe is connected with the gas suction port of the compressor. A return line is connected to the return outlet of the oil separator 5 and is connected to the suction pipe via a solenoid valve 74. An ejector 6 is connected to a pipeline between an oil return outlet of the oil separator 5 and an inlet of the electromagnetic valve 74, an injection port (i.e., the second inlet) of the ejector 6 is communicated to the bottom of the gas collecting pipe 41 through a liquid return pipe (i.e., the first pipeline), and a capillary 73 and a one-way valve 72 are connected to the liquid return pipe in series.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides an air conditioner refrigerating system, includes compressor (1), condenser (2), throttling element (3), evaporimeter (4), compressor (1), condenser (2), throttling element (3), evaporimeter (4) are connected in order and are formed refrigeration cycle, its characterized in that still includes oil separator (5), oil separator (5) connect in the gas vent of compressor (1) with between the air inlet of condenser (2), still include sprayer (6), sprayer (6) can oil separator (5) the oil return with the effect of the pressure differential between the breathing in of compressor (1) will under the effect of the hydrops in evaporimeter (4) reaches oil separator (5) the oil return is in the exit of sprayer (6) atomizes.

2. An air-conditioning refrigeration system according to claim 1, characterized in that a filter (71) is provided between the first inlet of the ejector (6) and the oil return of the oil separator (5).

3. Air-conditioning refrigeration system according to claim 1, characterized in that a one-way valve (72) is provided on the first line between the second inlet of the ejector (6) and the header (41) of the evaporator (4).

4. An air conditioning refrigeration system according to claim 3, characterized in that a capillary tube (73) is also provided on the first circuit.

5. An air-conditioning refrigeration system as recited in claim 3 wherein said first circuit includes an intake section communicating with the bottom of said header (41), said intake section extending above said bottom.

6. Air-conditioning refrigeration system according to any of claims 1 to 5, characterized in that a solenoid valve (74) is provided in the line between the outlet of the ejector (6) and the suction of the compressor (1).

7. Air conditioning refrigeration system according to claim 1, characterized in that the compressor (1) is on the indoor side.