CN214276230U

CN214276230U - Air conditioning system and oil separator

Info

Publication number: CN214276230U
Application number: CN202023182572.6U
Authority: CN
Inventors: 路则锋
Original assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-09-24
Anticipated expiration: 2030-12-25

Abstract

The utility model discloses an air conditioning system and oil separator, its oil separator includes: an outer cylinder, an air inlet pipe, an air outlet pipe and an oil return pipe which are communicated with the outer cylinder, and an inner cylinder arranged in the outer cylinder, wherein the inner cylinder is correspondingly sleeved below the air outlet pipe, an air outlet space is formed in the outer cylinder body together with the air outlet pipe, an inverted V-shaped filter screen is arranged at the inlet side of the inner cylinder, the oil return pipe is used for filtering oil-gas mixture, the corresponding position of the oil return pipe is also provided with a ball float valve, the utility model has simple and reliable structure and convenient manufacture and processing, meanwhile, the utility model improves the oil separation efficiency and the performance of the refrigeration system by arranging the inclined filter screen at the inlet side of the inner cylinder to filter the oil-gas mixture, simultaneously the utility model discloses a set up the internal cross-sectional area that the float valve adjusted back oil pipe, can guarantee under the various operating condition, the compressor can both be got back to the lubricating oil that separates out in the oil separator sooner, and can not take place refrigerant gas bypass short circuit problem.

Description

Air conditioning system and oil separator

Technical Field

The utility model relates to an air conditioning technology field especially relates to an air conditioning system and oil separator.

Background

In the existing refrigeration system, the refrigerant exhaust of a compressor enters an oil separator through an air inlet pipe, lubricating oil droplets carried in the refrigerant air flow are separated from gas, and the gas is discharged out of the oil separator through an air outlet pipe; the separated lubricating oil is deposited at the bottom of the oil separator, an oil return structure at the bottom returns the lubricating oil to the air suction pipe of the compressor through an oil return pipe so as to return the lubricating oil to the compressor, the diameter of the oil return pipe is small, and when impurities exist in the oil separator, the oil return pipe is easy to block, so that the lubricating oil cannot return to the compressor and is burnt due to oil shortage; when the separated lubricating oil is less, the oil return pipe is always communicated with the compressor air suction pipe, the oil level is reduced in the oil return process, so that the inlet of the oil return pipe cannot be completely submerged by the liquid lubricating oil, and high-pressure refrigerant gas in the oil separator can bypass to the compressor air suction pipe through the oil return pipe, so that the high-pressure refrigerant gas is short-circuited, and the refrigerating capacity and the energy efficiency of the refrigerating system are reduced. In addition, the filter screen of the oil separator is of a flat plate type, the windward area of the inlet of the filter screen is small, and the airflow velocity of the refrigerant in the filter screen is high, so that the oil separation efficiency of the conventional oil separator is low, the gas flow resistance is high, and the oil separation efficiency and the performance of a refrigerating system are also influenced.

SUMMERY OF THE UTILITY MODEL

In some embodiments of this application, an air conditioning system and oil separator are provided, it is provided with the filter screen and the ball-cock assembly of slope, and this application adopts interior outer tube structure, this application simple structure, it is reliable, the preparation processing is convenient, this application filters oil-gas mixture through the filter screen that sets up the slope in the inlet side of inner tube simultaneously, oil separating efficiency and refrigerating system performance have been improved, this application is adjusted back the interior sectional area of oil pipe through setting up the ball-cock assembly simultaneously, can guarantee under various operating condition, the compressor can both be got back to the lubricating oil of separating out in the oil separator fast, and can not take place refrigerant gas bypass short circuit problem.

In some embodiments of the present application, an inner and outer cylinder structure is adopted, refrigerant gas containing oil drops in the present application enters an annular space between the inner and outer cylinders through an air inlet pipe along a tangential direction of the outer cylinder, the spiral rotation direction flows downwards, under centrifugal force and inertia effect, part of the oil drops are separated from the air flow, the oil flows downwards to the bottom of the outer cylinder along the inner surface of the outer cylinder, the gas containing part of the oil drops enters the inner cylinder from an inlet of the inner cylinder, the oil drops in the air flow are further separated through an inverted V-shaped filter screen, the oil drops separated by the inverted V-shaped filter screen can drop to the bottom of the outer cylinder, the gas flows out of an oil separator from an air outlet pipe, lubricating oil collected to the bottom of the outer cylinder acts on a ball float valve through buoyancy, the ball float valve moves upwards or downwards, an oil return cross-flow area between a piston and the inner surface of an oil return pipe changes, and the lubricating oil returns to a compressor through an oil return pipe Reliable and convenient to manufacture and process.

In some embodiments of this application, add the filter screen, this application is through the inside of barrel sets up the filter screen of slope, and refrigerant gas enters into the internal back of urceolus, all need pass through just can get into the outlet duct after the filter screen filters, and the refrigerant air current velocity of flow is little in the filter screen of this application, and gas flow resistance is little to oil separating efficiency and refrigerating system performance have been improved.

In some embodiments of the application, the ball float valve is improved, when more oil is separated from the oil separator, the oil level in the outer cylinder body rises, the ball float valve moves upwards, the flow area of return oil is increased, the flow rate is increased, the oil quickly returns to the compressor through the oil return pipe and the compressor air suction pipe, and meanwhile, the oil level in the outer cylinder body is prevented from continuously rising, so that the faults that the compressor is burnt and the like due to the fact that the oil return speed of the oil return pipe is low (the oil return is not timely) or excessive lubricating oil is deposited in the outer cylinder body in the prior art are prevented; when the oil separated from the oil separator is less, the oil level in the outer cylinder body is reduced, the ball float valve moves downwards, the flow area of return oil is gradually reduced until the ball float valve is closed, and the problem that in the prior art, a large amount of high-pressure refrigerant gas in the outer cylinder body enters the air suction port of the compressor through the oil return pipe and the air suction pipe of the compressor to cause refrigerant bypass short circuit due to the fact that the oil return pipe is always communicated with the air suction pipe of the compressor (cannot be closed) is solved, and the reduction of the refrigerating capacity and the energy efficiency of a refrigerating system is avoided.

In some embodiments of the present application, there is provided an oil separator comprising: the inner cylinder body is correspondingly sleeved below the air outlet pipe and forms an air outlet channel together with the air outlet pipe in the outer cylinder body; an inclined filter screen is arranged on the inlet side of the inner cylinder and used for filtering oil-gas mixture, and a ball float valve is arranged at the corresponding position of the oil return pipe.

In some embodiments of the present application, the inner cylinder is coaxially disposed with the outlet pipe.

In some embodiments of this application, the filter screen outer edge with interior barrel inner wall fixed connection, the filter screen occupies the whole areas of air outlet channel that the inner barrel formed, just the filter screen cross-section is the shape of falling V.

In some embodiments of the present application, the filter screen is radially angled from the inner cylinder by 20 to 60 °.

In some embodiments of the present application, a sliding limiting rod is further disposed inside the outer cylinder, the sliding limiting rod is fixedly mounted in the inner cavity of the outer cylinder, and the position of the sliding limiting rod coincides with the central axis of the oil return pipe diameter opening communicated with the bottom of the outer cylinder; the valve core position of the float valve is provided with a through hole, the float valve is sleeved on the sliding limiting rod through the through hole in a sliding manner, and the float valve axially moves along the sliding limiting rod to control the connection relation between the oil return pipe through-diameter port and the inner cavity of the outer cylinder.

In some embodiments of this application, the ball-cock assembly includes floater and fixed connection in the piston of floater bottom, the piston with return oil pipe through-path mouth position corresponds, through the floater drives the piston is followed slip gag lever post axial displacement, in order to control the piston with the relative position of through-path mouth, and then control return oil pipe with outer barrel inner chamber's intercommunication or closed condition.

In some embodiments of the present application, the piston is configured as an inverted piston, and the inverted piston is specifically shaped as: there is at least one cross section that can fully occupy the full area of the cross section of the oil return pipe passage opening.

In some embodiments of the present application, when the oil submerges one tenth of the diameter length of the floating ball, the buoyancy generated by the oil on the floating ball is equal to the sum of the gravity borne by the floating ball and the piston, that is, (M + M) g ═ ρ gv; wherein M is the mass of the floating ball, M is the mass of the piston, g is the gravity acceleration, rho is the density of the oil, and v is the liquid discharge amount of the floating ball and the piston when the oil submerges one tenth of the diameter length of the floating ball.

In some embodiments of the present application, an air conditioning system includes a compressor, which is connected in series with a condenser, an expansion valve, and an evaporator in sequence via a four-way valve; an oil separator is further arranged between the compressor and the four-way valve, an air inlet pipe of the oil separator is communicated with an air outlet of the compressor, an air outlet pipe of the oil separator is communicated with the four-way valve, and an oil return pipe of the oil separator is communicated with an air suction port of the compressor.

Drawings

FIG. 1 is one of the schematic structural views of an oil separator in some embodiments of the present application;

FIG. 2 is an enlarged schematic view at "A" of FIG. 1 in some embodiments of the present application;

FIG. 3 is one of the schematic structural views of an oil separator in some embodiments of the present application;

fig. 4 is one of the schematic structural diagrams of the whole float valve in the embodiment of the present invention;

fig. 5 is a schematic structural diagram of a top view of the float valve along the reverse taper body toward the float ball in the embodiment of the present invention;

FIG. 6 is one of the overall structural schematic diagrams of a float valve in some embodiments of the present application;

FIG. 7 is a cross-sectional view of the overall construction of a float valve in accordance with certain embodiments of the present application;

FIG. 8 is a schematic illustration of the position of a float valve in a closed position with a return line port according to some embodiments of the present disclosure;

FIG. 9 is a schematic illustration of the position of a float valve in a semi-communicative condition with a return line port in accordance with certain embodiments of the present application;

FIG. 10 is a schematic illustration of the position of a float valve in communication with a return line port in some embodiments of the present application;

FIG. 11 is a schematic view of an air conditioning system connection in some embodiments of the present application.

Reference numerals:

100. an outer cylinder; 110. an inner cylinder; 120. an air inlet pipe; 130. an air outlet pipe; 140. an oil return pipe; 200. a filter screen; 300. a float valve; 310. a piston; 320. a floating ball; 330. a through hole; 400. the gag lever post slides.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

As shown in fig. 11, in some embodiments of the present application, an air conditioning system mainly includes: the compressor is sequentially connected with a condenser, an expansion valve and an evaporator in series through a four-way valve.

The air conditioning system performs a cooling/heating cycle of the air conditioning system by using a compressor, a heat exchanger, etc., and the cooling/heating cycle includes a series of processes involving compression, condensation, expansion, and evaporation.

The refrigerant gas in the low-temperature and low-pressure state enters the compressor and then is compressed by the compressor to form the refrigerant gas in the high-temperature and high-pressure state, the refrigerant gas is discharged out of the compressor, the discharged high-temperature and high-pressure refrigerant gas flows into the condenser through the oil separator and the four-way valve, heat is released to the surrounding environment through the condensation process, and the refrigerant is condensed into a liquid phase.

An expansion valve is arranged between the condenser and the evaporator, the expansion valve enables the liquid phase refrigerant in the high-temperature and high-pressure state condensed in the condenser to be expanded into a gas-liquid two-phase refrigerant in the low-temperature and low-pressure state, then the gas-liquid two-phase refrigerant enters the evaporator, the liquid refrigerant is evaporated into refrigerant gas, then the refrigerant gas returns to the compressor through a four-way valve, and the evaporator can realize the refrigeration effect of the air conditioner by utilizing the latent heat exchange of the evaporation of the refrigerant.

The four-way valve is provided with four interfaces which are respectively connected with the compressor, the condenser, the evaporator and the oil separator so as to control the flow direction and the flow rate of the refrigerant.

An oil separator is arranged between the compressor and the four-way valve to separate gas refrigerant and lubricating oil flowing into the oil separator, and the lubricating oil separated by the oil separator returns to the compressor through an oil return pipe 140, so that the faults of burning and the like of the compressor due to oil shortage are prevented.

The oil separator is used for discharging the gas and the lubricating oil separated in the outer cylinder 100 out of the outer cylinder 100 respectively, and controlling the speed of the discharged lubricating oil to be proper (the excessive oil return speed can cause liquid impact to damage the compressor).

In this embodiment, as an example of refrigeration operation, a high-temperature and high-pressure gaseous refrigerant carrying lubricating oil droplets discharged from a compressor enters an oil separator, and is separated into a gaseous refrigerant and liquid lubricating oil by the oil separator, the separated lubricating oil is deposited on the lower portion of the oil separator, and the oil enters a compressor suction port through an oil return pipe 140, so as to enter the compressor. The separated gaseous refrigerant flows out of the oil separator through an air outlet pipe 130 at the upper part of the oil separator, then enters a condenser through a four-way valve, heat is released to the surrounding environment through the condensation process, the refrigerant is condensed into a liquid phase, an expansion valve is arranged between the condenser and the evaporator, the expansion valve enables the liquid phase refrigerant in a high-temperature and high-pressure state condensed in the condenser to be expanded into a gas-liquid two-phase refrigerant in a low-temperature and low-pressure state, then the refrigerant enters the evaporator, the liquid refrigerant is evaporated into refrigerant gas, a refrigeration effect is formed, and then the refrigerant gas enters a gas suction port of the compressor through the four-way valve and further enters the compressor. Thereby, a complete refrigeration cycle is completed.

It should be noted that, during heating operation, the whole air conditioning system is the reverse process of the cooling operation embodiment.

As shown in fig. 1, in some embodiments of the present application, the oil separator is composed of an outer cylinder 100, an inner cylinder 110, an inlet pipe 120, an outlet pipe 130, an oil return pipe 140, a filter screen 200, and a ball float valve 300.

The oil separator is used to discharge the gas and the lubricating oil liquid separated in the outer cylinder 100 to the outer cylinder 100, respectively, and to control the speed of the discharged liquid to be appropriate.

The oil separator is disposed between the compressor and the four-way valve.

It should be noted that the inner cylinder 110 and the air outlet pipe 130 of the present application are coaxially disposed.

As shown in fig. 1, in some embodiments of the present application, the outer cylinder 100 and the inner cylinder 110, and both the outer cylinder 100 and the inner cylinder 110 are cylindrical structures.

The inner cylinder 110 is disposed inside the outer cylinder 100, and the outer cylinder 100 is communicated with an air inlet pipe 120, an air outlet pipe 130 and an oil return pipe 140.

It should be noted that, the inner cylinder 110 of the present application is correspondingly sleeved below the air outlet tube 130, and forms an air outlet channel together with the air outlet tube 130 in the outer cylinder 100.

Further, the present application adopts an inner and outer cylinder structure, refrigerant gas containing oil drops in the present application enters an annular space between the inner and outer cylinders through the air inlet pipe 120 along the tangential direction of the outer cylinder 100, the refrigerant gas spirally turns to flow downward, under the centrifugal force and the inertia effect, part of the oil drops are separated from the air flow, the oil flows downward to the bottom of the outer cylinder 100 along the inner surface of the outer cylinder 100, the gas containing part of the oil drops enters the inner cylinder from the inlet of the inner cylinder, the oil drops in the air flow are further separated by the inverted V-shaped filter screen 200, the oil drops separated by the inverted V-shaped filter screen 200 drop to the bottom of the outer cylinder 100, the gas flows out of the oil separator from the air outlet pipe 130, the lubricating oil collected to the bottom of the outer cylinder 100 acts on the ball float valve 300 through buoyancy to move the ball float valve 300 upward or downward, the oil return cross-flow area between the piston 310 and the inner surface of the oil return pipe 140 changes, and the lubricating oil returns to the compressor through the oil return pipe 140, therefore, the structure is simple and reliable, and the manufacturing and processing are convenient.

It should be noted that the air inlet pipe 120 of the present application is connected to the compressor, the air outlet pipe 130 is connected to the four-way valve, and the oil return pipe 140 is connected to the suction port of the compressor.

As shown in fig. 1, in some embodiments of the present disclosure, the filter screen 200 is a net-shaped inverted V-shaped structure 200.

The filter screen 200 is used for filtering the lubricating oil in the oil-gas mixture.

The filter screen 200 is disposed at an inlet side of the inner cylinder.

It should be noted that, the filter screen 200 of the present application is obliquely disposed at the inlet side of the inner cylinder, the outer edge of the filter screen 200 is fixedly connected to the inner wall of the inner cylinder 110, and the filter screen 200 occupies the entire area of the air outlet channel formed by the inner cylinder 110.

Furthermore, the filter screen 200 of the present application forms an angle of 20 to 60 ° with the radial direction of the inner cylinder.

It should be noted here that, this application is through the inside filter screen 200 that sets up the slope at the barrel, and refrigerant gas enters into outer barrel 100 back in, and all need just can get into outlet duct 130 after filter screen 200 filters, and refrigerant airflow velocity of flow is little in the filter screen 200 of this application, and gas flow resistance is little to oil separation efficiency and refrigerating system performance have been improved.

This application sets up the filter screen 200 of slope through the inside at the barrel, and refrigerant gas enters into outer barrel 100 interior back, and all need just can get into outlet duct 130 after filter screen 200 filters, through the shape of falling V filter screen 200 that adopts the slope to set up, has increased the windward area of filter screen 200, and refrigerant air current velocity of flow is little in the filter screen, and filter screen 200's oil separation efficiency is low, and gas flow resistance is little to oil separation efficiency and refrigerating system performance have been improved. Through the inverted V-shaped filter screen 200 that adopts the slope to set up, still increased the area of contact of the gaseous and filter screen 200 of the oil-gas mixture state refrigerant that is flowed out by outlet duct 130, the collision intercepts oil in the gas to can adsorb oil in the refrigerant gas through the viscidity effect of the oil drop of adhesion on filter screen 200, the effect of oil-gas separation has obviously been improved.

As shown in fig. 2-10, in some embodiments of the present application, the float valve 300 is comprised of a float 320 and a piston 310,

the ball float valve 300 is used to adjust the inner sectional area of the oil return pipe 140.

The ball float valve 300 is connected to the oil return pipe 140, wherein, the inside slip gag lever post 400 that still is provided with of outer barrel 100, slip gag lever post 400 fixed mounting is in outer barrel 100 inner chamber, the central axis position coincidence of slip gag lever post 400 and the oil return pipe 140 latus rectum mouth that communicates in outer barrel 100 bottom, the through-hole 330 has been seted up to the case position of ball float valve 300, the ball float valve 300 overlaps on the slip gag lever post 400 through the through-hole 330 slidable ground, the ball float valve 300 is through following the connected relation of slip gag lever post 400 axial motion in order to control oil return pipe 140 latus rectum mouth and outer barrel 100 inner chamber.

As shown in fig. 2-10, in some embodiments of the present application, a float 320 and a piston 310, wherein the float 320 is a spherical structure.

The floating ball 320 is used to drive the piston 310 to move axially along the sliding limiting rod 400, so as to control the relative position of the piston 310 and the through-hole, and further control the communication or closed state of the oil return pipe 140 and the inner cavity of the outer cylinder 100.

The float ball 320 is installed in the float valve 300, and the piston 310 is fixedly connected to the bottom of the float ball 320.

It should be noted that the piston 310 of the present application is configured as an inverted piston 310, and the shape of the inverted piston 310 is specifically configured as follows: there is at least one cross-section that can completely occupy the entire area of the cross-section of the bore of the oil return pipe 140.

Further, in some embodiments of this application, thereby the return oil speed is adjusted to the ball-cock assembly 300 of this application regulation return oil passageway sectional area for solve current oil separator oil gallery and easily block up, and oil separator content easily stores up higher oil level and the nonadjustable problem of return oil speed, because the utility model discloses return oil circulation sectional area is adjustable, so can guarantee air conditioning system under various operating modes, the lubricating oil of separating out in the oil separator can both get back to the compressor fast, and return oil speed is suitable, and the oil return volume does not take place the liquid and hits, thereby has guaranteed the normal operating of compressor.

As shown in fig. 2-10, in some embodiments of the present application, the size of the float ball 320 and the mass of the entire float valve 300 are configured to: when the oil submerges one tenth of the diameter length of the floating ball 320, the buoyancy generated by the oil on the floating ball 320 is equal to the sum of the gravity borne by the floating ball 320 and the piston 310, that is, (M + M) g ═ ρ gv;

where M is the mass of the float 320, M is the mass of the piston 310, g is the acceleration of gravity, ρ is the density of the oil, and v is the displacement of the float 320 and the piston 310 when the oil submerges one tenth of the diameter of the float 320.

It should be noted that, when the oil height in the tank body just reaches one tenth of the diameter length of the floating ball 320, the gravity of the ball float 300 is balanced with the buoyancy force of the oil on the ball float, and along with the increase of the oil in the tank body, the ball float 300 rises along the axial direction of the sliding limiting rod 400 along with the increase of the liquid level height of the oil, the piston 310 is separated from the position of the diameter opening of the oil return pipe 140, the diameter opening of the oil return pipe 140 is gradually opened along with the separation of the piston 310, until the bottom of the piston 310 is flush with the plane of the diameter opening of the oil return pipe 140, the opening of the diameter opening of the oil return pipe 140 reaches the maximum value of 100%, and the maximum value is the total area of the cross section of the diameter opening of the oil return pipe 140.

Based on the above embodiment, the connection relationship between the piston 310 and the through-diameter opening of the oil return pipe 140 includes three states of communication, semi-communication or closing (in the figure, L is the diameter length of the ball of the floating ball 320);

as shown in fig. 8 (in the drawing, L is the diameter length of the ball body of the floating ball 320), when there is no oil inside the tank body or the height of the oil inside the tank body does not exceed one tenth of the diameter length of the floating ball 320, the piston 310 completely closes the diameter opening of the oil return pipe 140, at this time, the connection relationship between the piston 310 and the diameter opening of the oil return pipe 140 is a closed state, and the opening of the cross section of the diameter opening of the oil return pipe 140 is 0%, which can prevent the problem that in the prior art, because the oil return pipe is always communicated with the suction pipe of the compressor and cannot be closed, the high-pressure refrigerant gas in the oil separator can bypass to the suction pipe of the compressor through the oil return pipe, causing the short circuit of the high-pressure refrigerant gas, thereby reducing the refrigerating capacity and energy efficiency of the refrigerating system.

As shown in fig. 9 (in the drawing, L is the diameter length of the ball of the floating ball 320), on the basis of the closed state, when the height of the oil inside the tank is higher than one tenth of the diameter length of the floating ball 320 and lower than the sum of one tenth of the diameter length of the floating ball 320 and the height of the piston 310, the floating ball 320 is subjected to the buoyancy action of the oil, and changes along the axial direction of the sliding limiting rod 400 along with the real-time height of the liquid level of the oil, the piston 310 is separated from the through-diameter opening of the oil return pipe 140 under the driving of the floating ball 320, at this time, the connection relationship between the piston 310 and the through-diameter opening of the oil return pipe 140 is a semi-connection state, and the opening of the through-diameter opening of the oil return pipe 140 is: greater than 0% and less than 100%;

as shown in fig. 10 (in the figure, L is the diameter length of the ball of the float 320), when the height of the oil inside the tank is greater than or equal to the sum of one tenth of the diameter length of the float 320 and the height of the piston 310, the piston 310 is completely separated from the position of the through-diameter opening of the oil return pipe 140, at this time, the connection relationship between the piston 310 and the through-diameter opening of the oil return pipe 140 is in a communication state, and the opening of the cross-section of the through-diameter opening of the oil return pipe 140 is 100%.

In some embodiments of the present application, as shown in fig. 1-10, the principle of operation of the oil separator of the present application:

when the refrigerating system is in operation, the exhaust gas of the compressor contains oil drops, refrigerant gas carrying the oil drops enters the outer cylinder body 100 of the oil separator from the air inlet pipe 120 along the tangential direction, the refrigerant gas spirally rotates to flow downwards along an annular space between the inner cylinder body and the outer cylinder body, part of the oil drops are separated from the air flow under the action of centrifugal force and inertia, the oil flows downwards along the inner surface of the outer cylinder body 100 to the bottom of the outer cylinder body 100, the gas containing part of the oil drops enters the inner cylinder from the inlet of the inner cylinder body, the oil drops in the air flow are further separated through the inverted V-shaped filter screen 200, the oil drops separated by the inverted V-shaped filter screen 200 drop to the bottom of the outer cylinder body 100, the gas flows out of the oil separator from the air outlet pipe 130, the lubricating oil collected to the bottom of the outer cylinder body 100 acts on the ball float valve 300 through buoyancy, the lubricating oil floats along the sliding limiting rod 400, the more the oil discharged by the compressor, the more the oil, the higher the bottom of the oil level, the higher the float valve 300 floats, the larger the oil return flow cross section area between the piston 310 and the inner surface of the oil return pipe 140 is, so that the lubricating oil can timely return to the compressor through the oil return pipe 140, the normal operation of the compressor without oil shortage is ensured, and the faults that the oil return speed is low (the oil return is not timely) caused by the small pipe diameter of the oil return pipe 140 or the compressor is lack of oil caused by excessive lubricating oil deposited in the outer cylinder 100 in the prior art, and the compressor is burnt and the like are prevented.

In addition, when the clearance between the piston 310 and the inner surface of the oil return pipe 140 is blocked by impurities, the liquid level in the outer cylinder 100 gradually rises, the clearance becomes larger, oil can continuously circulate, fluid can wash away the attached impurities and recover the unblocked state, and the inner sectional area (corresponding to the inner diameter of the oil return pipe 140) of the oil return pipe 140 is 2 times of the sum of the circulation sectional areas of all the oil return pipes 140 in the refrigeration product oil separator with the same cooling capacity in the prior art, so that the blockage is not easy to occur, and the problems of oil shortage, burning and the like of the compressor caused by the blockage of the oil return sectional area in the prior art are solved.

This application is when the compressor oil discharge volume is less or not arrange the oil, the oil of separating is just few, the bottom oil level just descends gradually, ball-cock assembly 300 moves down along slip gag lever post 400, the oil return flow cross-section area between piston 310 and the oil return pipe 140 internal surface reduces gradually until all closing, prevented among the prior art because of oil return pipe 140 communicates the compressor breathing pipe all the time (can't close) and lead to a large amount of high-pressure refrigerant gas in the outer barrel 100 to get into the compressor induction port through oil return pipe 140 and compressor breathing pipe and take place refrigerant bypass short circuit problem, the reduction of refrigerating system refrigerating capacity and efficiency has been avoided.

Further, with the amount of oil discharged from the compressor, i.e., the amount of separated lubricating oil, the oil level at the bottom of the outer cylinder 100 fluctuates up and down, the ball float valve 300 floats up and down, the piston 310 moves up and down in the oil return pipe 140, the oil return flow cross-sectional area between the piston 310 and the inner surface of the oil return pipe 140 varies from 0% to 100%, when the oil level is immersed in one tenth of the diameter of the ball float 320, the ball float valve 300 is completely suspended, the oil return flow cross-sectional area reaches 100%, i.e., the inner cross-sectional area of the oil return pipe 140 is reached, and at this time, the oil discharge amount of the corresponding compressor is the maximum oil discharge amount.

It should be noted that, because the sizes of the float 320 and the piston 310 are small, even if the oil level submerges one tenth of the diameter of the float 320, the lubricating oil accumulated at the bottom of the outer cylinder 100 is little, and the problem of oil shortage of the compressor does not occur.

According to the first design of this application, the friendship this application is provided with the filter screen and the ball-cock assembly of slope, and this application adopts interior outer tube structure, this application simple structure, it is reliable, preparation processing is convenient, simultaneously this application filters the oil-gas mixture through the filter screen that sets up the slope at the entry side of inner tube, oil separating efficiency and refrigerating system performance have been improved, simultaneously this application is through setting up the interior sectional area that the ball-cock assembly returned the oil pipe, can guarantee under various operating condition, the compressor can both be got back to the lubricating oil of isolating in the oil separator relatively fast, and can not take place refrigerant gas bypass short circuit problem.

According to the second concept of the present application, because the present application adopts the inner and outer cylinder structure, refrigerant gas containing oil drops in the present application enters the annular space between the inner and outer cylinders through the air inlet pipe along the tangential direction of the outer cylinder, the spiral rotation direction turns downward, under the centrifugal force and the inertia effect, part of the oil drops are separated from the air flow, the oil flows downward to the bottom of the outer cylinder along the inner surface of the outer cylinder, the gas containing part of the oil drops enters the inner cylinder from the inlet of the inner cylinder, the oil drops in the air flow are further separated through the inverted V-shaped filter screen, the oil drops separated by the inverted V-shaped filter screen drop to the bottom of the outer cylinder, the gas flows out of the oil separator from the air outlet pipe, the lubricating oil collected to the bottom of the outer cylinder acts on the ball float valve through the buoyancy force to move the ball float valve upward or downward, the oil return sectional area between the piston and the inner surface of the oil return pipe changes, and the lubricating oil returns to the compressor through the oil return pipe, therefore, the structure is simple and reliable, and the manufacturing and processing are convenient.

According to the third design of this application, owing to the filter screen has been add to this application, so this application sets up the V-arrangement filter screen of slope through the inside at the barrel, and refrigerant gas enters into the internal back of urceolus, and all need just can get into the outlet duct after the filter screen filters, and refrigerant air current velocity of flow is little in the filter screen of this application, and the gas flow resistance is little to oil separating efficiency and refrigerating system performance have been improved.

According to the fourth conception of the application, the floating ball valve is improved, so that when more oil is separated from the oil separator, the oil level in the outer cylinder body rises, the floating ball valve moves upwards, the flow area of return oil is increased, the flow is increased, the oil quickly returns to the compressor through the oil return pipe and the compressor air suction pipe, and meanwhile, the oil level in the outer cylinder body is prevented from continuously rising, and the faults that the compressor is lack of oil due to the fact that the oil return speed is low (the oil return is not timely) or excessive lubricating oil is deposited in the outer cylinder body in the prior art, and the compressor is burnt and the like are prevented; when the oil separated from the oil separator is less, the oil level in the outer cylinder body is reduced, the ball float valve moves downwards, the flow area of return oil is gradually reduced until the ball float valve is closed, and the problem that in the prior art, a large amount of high-pressure refrigerant gas in the outer cylinder body enters the air suction port of the compressor through the oil return pipe and the air suction pipe of the compressor to cause refrigerant bypass short circuit due to the fact that the oil return pipe is always communicated with the air suction pipe of the compressor (cannot be closed) is solved, and the reduction of the refrigerating capacity and the energy efficiency of a refrigerating system is avoided.

Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil separator comprising: the device comprises an outer cylinder, an air inlet pipe, an air outlet pipe and an oil return pipe which are respectively communicated with the outer cylinder, and an inner cylinder arranged in the outer cylinder;

the inner cylinder body is correspondingly sleeved below the air outlet pipe, and the inner cylinder body and the air outlet pipe form an air outlet channel together in the outer cylinder body;

an inclined filter screen is arranged on the inlet side of the inner cylinder and used for filtering oil-gas mixture, and a ball float valve is arranged at the corresponding position of the oil return pipe.

2. An oil separator as set forth in claim 1 wherein said inner cylinder is disposed coaxially with said outlet tube.

3. The oil separator of claim 1, wherein the outer edge of the filter screen is fixedly connected with the inner wall of the inner cylinder, the filter screen occupies the entire area of an air outlet passage formed by the inner cylinder, and the cross section of the filter screen is in an inverted V shape.

4. An oil separator as set forth in claim 3 wherein said filter screen is radially angled from said inner cylinder by an angle of 20-60 °.

5. The oil separator of claim 1, wherein a sliding limiting rod is further arranged inside the outer cylinder body, the sliding limiting rod is fixedly arranged in the inner cavity of the outer cylinder body, and the position of the sliding limiting rod is overlapped with the central axis of the oil return pipe through-diameter port communicated with the bottom of the outer cylinder body;

the valve core position of the float valve is provided with a through hole, the float valve is sleeved on the sliding limiting rod through the through hole in a sliding manner, and the float valve axially moves along the sliding limiting rod to control the connection relation between the oil return pipe through-diameter port and the inner cavity of the outer cylinder.

6. The oil separator of claim 5, wherein said ball float valve includes a floating ball and a piston fixedly connected to the bottom of the floating ball, said piston corresponding to the position of said oil return pipe through-hole, said floating ball driving said piston to move axially along said sliding stop rod to control the relative position of said piston and said through-hole, and further controlling the communication or closing state of said oil return pipe and the inner cavity of said outer cylinder.

7. An oil separator as claimed in claim 6, wherein said piston is configured as an inverted piston, and wherein said inverted piston is shaped specifically to: there is at least one cross section that can fully occupy the full area of the cross section of the oil return pipe passage opening.

8. The oil separator of claim 6 wherein when oil submerges one tenth of the length of the diameter of the float, the buoyancy of the oil on the float is equal to the sum of the weight forces experienced by the float and the piston, i.e., (M + M) g-pgv;

wherein M is the mass of the floating ball, M is the mass of the piston, g is the gravity acceleration, rho is the density of the oil, and v is the liquid discharge amount of the floating ball and the piston when the oil submerges one tenth of the diameter length of the floating ball.

9. An air conditioning system comprises a compressor, wherein the compressor is sequentially connected with a condenser, an expansion valve and an evaporator in series through a four-way valve;

characterized in that an oil separator as set forth in any one of claims 1-8 is further disposed between the compressor and the four-way valve;

the air inlet pipe is communicated with an air outlet of the compressor, the air outlet pipe is communicated with the four-way valve, and the oil return pipe is communicated with an air suction port of the compressor.