KR100671848B1 - Oil-separator of cooling unit - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil separator for a cooling device capable of recovering compressor lubricating oil from a refrigerant discharged from a compressor and returning the compressor lubricating oil to the compressor. More particularly, the present invention relates to an oil separator for a cooling device having a high oil recovery rate and easy cleaning.

Oil separator for a cooling device according to the present invention, the case 10, the discharge pipe 30 and the inlet pipe 30 are respectively installed above and below the case, coupled to the inlet pipe in the case through the inlet pipe A spray network 50 for filtering foreign substances while injecting the high-pressure refrigerant introduced therein, the tip of which is disposed at the bottom of the case and the end of which is connected to the suction side of the compressor to recover oil to guide the oil in the case 10 to the suction side of the compressor. Tube 40, between the spray network and the inlet pipe filter mesh 60 to filter oil from the refrigerant flowing from the spray network to the discharge pipe side, foreign matter contained in the refrigerant flowing in the discharge pipe over the filter network It comprises a filtering plate 70 for filtering the filter, in particular, the filtering net 60 is the upper net 61 and the lower net disposed below the injection network disposed above the injection network Made of 62, the upper net body is the height ratio (h / d) compared to a diameter of 0.4 to 0.6, the porosity of each net body is characterized in that 95 to 99%.

Oil separator, compressor, oil, filter net, foreign substance

Description

Oil Separator for Cooling Unit {OIL-SEPARATOR OF COOLING UNIT}             

1 is a perspective view of an oil separator for a cooling device according to an embodiment of the present invention.

Figure 2 is an exploded perspective view of an oil separator for a cooling device according to an embodiment of the present invention.

Figure 3 is a front sectional view of an oil separator for a cooling device according to an embodiment of the present invention.

4 is a cross-sectional view taken along the line IV-IV of FIG. 3.

<Description of Symbols for Major Parts of Drawings>

10 case 11 upper case

12: lower case 12a: oil collection part

20: inlet pipe 30: discharge pipe

31: thread portion 40: recovery pipe

41: fixing frame 42: screen

50: spraying network 60: filtering network,

61: upper mesh 62: lower mesh

70: filter plate 71: porous plate

72 screen 80 shielding plate

The present invention relates to an oil separator for a cooling device capable of recovering the compressor lubricating oil from the refrigerant discharged from the compressor of the cooling device to the condenser side and returning it to the compressor. In particular, the oil separator for the cooling device having a high oil recovery rate and easy cleaning, etc. It is about.

A refrigeration tower vehicle is a vehicle configured with a refrigerated tower having an insulating structure on the deck, and transported in a refrigerated or frozen storage state at a temperature lower than room temperature so as not to deteriorate items such as meat or vegetables. .

Such a freezer is a cooling device for cooling the inside of a container, which is a freezer, an evaporator for cooling heat inside a container with an adiabatic expanded refrigerant, a compressor for compressing the vaporized refrigerant from the evaporator and discharging it in a high pressure gas phase, And a condenser for radiating the refrigerant discharged from the compressor by heat exchange with external air to condense it into a liquid phase, and an expansion valve for expanding and supplying the refrigerant condensed in the condenser to an evaporator. In addition, a blower for blowing the container indoor air toward the evaporator, a temperature setting unit for setting the refrigeration / refrigeration temperature of the container, a temperature sensing unit for detecting the internal temperature of the container, and a controller for controlling the operation thereof. .

The cooling device having such a configuration circulates the refrigerant through the compressor, the condenser, the receiver dryer, the expansion valve, and the evaporator by the driving of the compressor along the refrigerant circulation cycle leading back to the compressor, and simultaneously blows the container indoor air into the blower. By blowing through the evaporator, the container indoor air can be cooled by the latent heat of refrigerant evaporation in the evaporator while passing through the evaporator to maintain the interior of the container at a refrigerated or frozen temperature.

In such a cooling device, the compressor absorbs the latent heat of evaporation from the air, compresses the refrigerant changed into a gas in superheated vapor state, and discharges the refrigerant to the condenser, which is used to smoothly drive the compressor drive part. Is being supplied. In the compressor, the oil lubricates the mechanical friction surfaces of the driving parts.If such oil enters the condenser, expansion device or evaporator, the oil adheres to the inner wall of the heat exchanger or occupies the refrigerant flow path of the heat exchanger, As a result, the heat exchange efficiency of the heat exchanger is reduced, resulting in a decrease in the cooling performance of the cooling device. In addition, when the oil circulates through the entire cooling system, a significant fluctuation occurs in the amount of oil supplied to the compressor, so that the lubrication of the compressor driving part is not stable, and thus the durability of the compressor is lowered. Thus, an oil separator is installed in the cooling device of the refrigerating vehicle to recover oil from the discharge side of the compressor and return it to the compressor so that the oil supplied to the compressor does not circulate along the refrigerant circulation cycle.

In the cooling device, the oil separator separates oil from the high-pressure gas refrigerant discharged from the compressor to the condenser side and returns the oil to the compressor suction side, thereby preventing the oil from deteriorating the efficiency of the heat exchanger and stably lubricating the compressor. .

Oil separators included in Korean Utility Model Registration No. 164344 (name: vehicle cooler device) or Oil Separator of Korean Utility Model Registration No. 303479 are representative oil separators for cooling devices.

These conventional oil separators separate oil from the refrigerant discharged from the compressor and flow to the condenser side, and then return to the inlet side of the compressor to prevent the oil from circulating the refrigerant circulation cycle with the refrigerant, thereby preventing the reduction of cooling performance due to the oil circulation. It was composed.

However, the oil separator (oil separator) of Korean Registered Utility Model No. 164344 is configured to filter oil contained in the refrigerant by relying only on a cylindrical wire mesh having a flat mesh structure that surrounds the condenser side connection in the case. Since the oil separation efficiency was poor, there was a problem that the oil recovery rate was low.

And, in the case of Korean Utility Model Registration No. 303479, 'Oil Separator', the first oil filtration network coupled to the tip of the compressor connection, the mesh disposed on the first oil filtration network (網 體: mesh made of loosely entangled wire in a scrubber shape) The oil was filtered through at least three stages of filtration such as a second oil filtration net and a third oil filtration plate covering the second oil filtration net. However, since the volume and porosity of the second oil filtration network which have the greatest effect on the oil separation efficiency are set arbitrarily and roughly without experiment, the conventional oil separator is used when the volume of the second oil filtration network is excessively large. While the separation efficiency is high, the discharge pressure of the refrigerant is excessively lowered to reduce the refrigerant circulation efficiency. On the contrary, when the refrigerant is designed to be too small, the oil separation efficiency is lowered, and a part of the oil flows along the refrigerant circulation cycle, thereby reducing the refrigerant circulation efficiency. As a result, there is a problem in that the volume of the second oil filtration network is set too large or too small to lower the cooling performance of the cooling device. In addition, the third oil filtration plate which finally separates the oil and the capillary tube for returning the separated oil to the suction side of the compressor are also not properly set, so that the oil separation rate and recovery rate are large when these specifications are not properly combined. There has been a problem of further deepening the problem of lowering the cooling performance.

Accordingly, the present invention has been made to solve the problems of the oil separator for the conventional cooling apparatus as described above, each of the components so that the oil can be effectively separated and returned to the compressor without dropping the refrigerant pressure from the compressor discharge refrigerant It is an object of the present invention to provide an oil separator for a cooling device that is properly combined with the standard, which can contribute to improving the cooling performance of the cooling device. It is also an object of the present invention to provide an oil separator for a cooling device that can be easily cleaned inside.

The oil separator for a cooling device according to the present invention includes a case forming a sealed space, an inlet pipe and an outlet pipe respectively installed on one side and the ceiling of the case, and horizontally coupled to the tip of the inlet pipe in the case. An injection network for filtering foreign substances while spraying high-pressure refrigerant introduced through the air in four directions; A fixed frame placed in a case, an oil return pipe wound around the fixed frame, the tip of which is disposed at the bottom of the case, and the end of which is connected to the suction side of the compressor to guide the oil accumulated on the bottom of the case to the compressor; Oil from the refrigerant flowing into the discharge pipe after being injected from the injection network between the discharge pipe and the discharge pipe In that filters filtering net body and the net body is provided on the filtration in an oil separator for a cooling device comprising a manure plate, including to filter out the foreign substances contained in the refrigerant flowing into the discharge pipe via the filtering net body,
The filter net is composed of an upper net disposed above the spray net and a lower net disposed below the spray net, and the upper net has a ratio of height to diameter (h / d) of 0.4 to 0.6, and each net The porosity of is characterized by 95 to 99%.

In the above configuration, in the center of the bottom of the lower case may be concave shape of the collecting portion in which the tip inlet of the oil return pipe is placed.

In addition, a shielding plate may be further included to shield the upper portion of the spraying network to prevent refrigerant from being directly injected from the spraying network to the upper mesh.

The oil return pipe is preferably a capillary tube with an inner diameter of 1 to 1.5 mm wound around a fixed frame placed in the lower case and having a total length of 3000 to 4000 mm.

In addition, the inner middle of the fixing frame may include a screen that is caught by the filter mesh to filter foreign matter from the oil falling to the collecting portion, the filter plate is a porous plate and the through hole is formed with a diameter of 5 mm or more It is preferred to consist of a 50-150 mesh screen bonded to the stencil.

Hereinafter, the features and advantages of the oil separator for a cooling apparatus according to the present invention having the above configuration will be described in more detail through preferred embodiments.

1 is a perspective view of an oil separator for a cooling apparatus according to an embodiment of the present invention, Figures 2 and 3 are exploded perspective and front cross-sectional view, Figure 4 is a cross-sectional view taken line IV-IV of FIG.

As shown, the oil separator 100 for a cooling device according to the present invention is installed between the compressor and the condenser to recover the oil contained in the high-pressure gas refrigerant discharged by the compressor, and forms a closed space. The inlet pipe 20 and the discharge pipe 30 which are respectively installed in the case 10 and the upper and lower sides of the case 10 are connected to the refrigerant pipe connected to the discharge side of the compressor and the refrigerant pipe connected to the inlet side of the condenser. ), Oil filtration means for filtering the refrigerant flowing through the inlet pipe 20 from the compressor and discharged to the discharge pipe 30 to filter oil from the refrigerant, and returning the oil filtered by the oil filtration means to the compressor suction side. It consists of a recovery pipe 40 and the like.

In the above configuration, the case 10 is composed of upper and lower cases 11 and 12 coupled to the upper and lower sides to form a closed space, and the oil falling on the bottom of the lower case 12 is collected therein. The collecting portion 12a is formed to be concave.

The inlet pipe 20 is coupled in a screwed manner so as to be detachable to the middle side of the lower case 12. That is, the inlet pipe 20 has a thread 21 formed at the front end thereof, and the front end thereof is coupled to the lower case 12 by being fastened to the welding nut 13 welded to the lower case 12. .

The discharge pipe 30 is installed at the center of the ceiling of the upper case 11, and a coolant inlet 30a is formed at a lower end of the upper case 11 and a coolant outlet 32 is formed at the outer upper end of the condenser. A refrigerant pipe (not shown) connected to the inflow side is connected. In addition, although not shown in the drawings, the discharge pipe 30 may also be configured to be detachably coupled to the upper case 11 as in the case of the inlet pipe 20 described above.

The recovery pipe 40 is wound around the outer circumferential surface of the cylindrical fixing frame 41 placed on the inner bottom of the lower case 12 so that the inlet 40a of the tip is locked under the water surface of the oil collected in the collecting part 12a. The outlet 40b is drawn out of the lower case 12 and connected to the suction side of the compressor. The recovery pipe 40 returns oil separated from the refrigerant to the compressor side by a pressure difference between the inlet port (in the oil separator case) and the outlet port (compressor suction side), and the oil recovery rate varies greatly depending on the length and the inner diameter. . According to the results of experiments repeated several dozen times, a capillary tube having an inner diameter of 1 to 1.5 mm (preferably 1.25 mm) is suitable for the recovery pipe 40, and the entire length from the inlet 40a to the outlet 40b is The oil recovery efficiency was found to be high at 3000-5000 mm (most preferably 4000 mm). A filter network (not shown) having a mesh structure may be coupled to an inlet of the recovery pipe 40, and a refrigerant pipe connected to the inlet side of the compressor while fixing the recovery pipe 40 to the lower case 12. Connector 43 for connecting the can be installed.

Fixing frame 41 is a hollow cylindrical body formed to have a symmetric structure up / down, the recovery pipe 40 is wound on the outer peripheral surface, the lower mesh 62 is placed therein. In the middle of the inside, a screen 42 of about 100 mesh is installed to filter out foreign substances contained in the oil and prevent foreign substances from mixing with the oil and flowing to the compressor side.

The oil filtration means for separating and recovering oil from the refrigerant is detachably coupled to the inner end of the inflow pipe 20 to filter foreign substances while injecting high pressure refrigerant introduced from the compressor through the inflow pipe 20 in all directions. Filtering net 60, which is injected from the injection network 50 between the injection network 50, the injection network 50 and the inlet pipe 20 to filter the oil from the refrigerant flowing to the discharge pipe 30 side, The filter plate 60 includes a filtering plate 70 for filtering foreign substances contained in the refrigerant discharged into the discharge pipe 30 through the filter network 60.

In the above configuration, the injection network 50 is a hollow cylindrical screen, as shown in Figure 2, screwed to the tip of the inlet pipe 20 so that it can be easily separated and dismantled from the inlet pipe 20 when necessary It is combined by a detachable coupling method. The injection network 50 has an outer diameter smaller than the inlet pipe 20, so that when the inlet pipe 20 is separated from the case 10, a hole formed in the lower case 12 for installing the inlet pipe 20 is formed. Through the case 10 can be drawn out. Therefore, the foreign matters filtered in the inside can be removed very easily, and the inside of the case 10 can be visually seen to determine whether the inside of the case 10 needs to be cleaned very easily. The upper portion of the spray network 50 is shielded with a shield plate 80 to prevent refrigerant from being injected directly from the spray network 50 upwards (upper network).

The filter net 60 is composed of an upper net 61 which is disposed on the spray net 50 and supported by the porous plate 63, and a lower net 62 disposed below the spray net 50. These meshes 61 and 62 are formed by loosely weaving a net made of iron wire to have a predetermined volume, and serve to filter oil contained in the refrigerant injected from the injection network 50. That is, the high pressure gaseous refrigerant injected from the injection network 50 is discharged through the discharge pipe 30 through the lower mesh 62 and the upper mesh 61, and the liquid oil and foreign substances included in the refrigerant in the process have a viscosity and Due to the volume, the filter does not pass through the filtering net 60 but is buried in the wire of the filtering net 60 and falls to the bottom of the case 10 by gravity. In the case of the filtration net 60, when the oil is too loose, the oil separation effect is inferior. On the contrary, when the filter mesh 60 is too dense, the refrigerant pressure is lowered to reduce the refrigerant circulation efficiency. As a result of dozens of repeated experiments, each of the nets 61 and 62 preferably has a porosity of 95 to 99%, especially in the case of the upper nets having a direct effect on the pressure reduction of the refrigerant, the height (h) / d) of 0.4 to 0.6, in particular, it was found to have an optimum efficiency, especially at 0.4 (height (h): 40 mm, diameter (d): 75 mm).

The filtering plate 70 filters foreign matters from the refrigerant discharged to the discharge pipe 30 through the filter net 60 on the filter net 60, and through holes 71a having approximately 5 mm are formed at regular intervals. It consists of a perforated plate 71 and a filter net 72 of about 50 to 200 mesh, preferably 100 mesh, attached to the perforated plate 71.

According to the configuration as described above, the oil separator for a cooling apparatus according to an embodiment of the present invention can act as follows to separate the oil from the refrigerant discharged from the compressor to recover to the compressor.

The high pressure gas refrigerant discharged from the compressor is introduced into the oil separator through the refrigerant pipe and into the inlet pipe 20. The refrigerant introduced into the oil separator through the inlet pipe 20 is injected from the injection network 50, and then filtered through the filtering net 60, that is, the lower net 62 and the upper net 61, and filtering the filter plate 70. After being discharged to the discharge pipe 30 and flows to the condenser side, in the process, the oil and foreign matter contained in the refrigerant are primarily filtered in the spraying network 50, and the fine oil not filtered in the spraying network 50. The foreign matters are buried on the wire surfaces of the nets 61 and 62 while the refrigerant passes through the filter net 60 due to the viscosity and volume, respectively, and then fall to the bottom of the case 10 by gravity. In addition, foreign matters such as oil that is not filtered by the filter net 60 or debris such as the filter net 60 are finally filtered by the filter plate 70. Since the filtering network 60 of the above filtering means is a structure in which very thin wires are tangled irregularly in the form of a loofah, gaseous refrigerant passes through the filtering network 60 without constant direction to other filtering means having regular holes. Compared with oil filtration effect is high. Subsequently, the gas refrigerant passing through the filtration net 60 is filtered again while passing through the porous plate 71 and the screen 72 of the filter plate 70 to filter most of the oil and foreign matter contained in the gas refrigerant. .

The liquid oil, which is filtered out of the gas refrigerant by the filtering means and falls to the lower portion, is collected in the collecting part 12a through the screen 42 in the fixing mold 40. At this time, the foreign matter contained in the oil is fixed in the fixing mold 40. Since it is filtered from the inner screen 42, only the pure oil is collected in the collecting portion 12a of the lower case 12. The oil collected from the refrigerant and collected in the collecting part 12a is returned to the suction side of the compressor through the collecting pipe 40 by the pressure difference, and used again to lubricate the mechanical friction part of the compressor.

This oil filter is separated from the lower case 12 by turning the inlet pipe 20 without removing the case 10, and then whether the cleaning is necessary or not through the hole in which the inlet pipe 20 was installed. It can be easily determined by visually identifying the case, and, in case of cleaning, injecting high pressure air through the inlet pipe 20 or the outlet pipe 30 of the ceiling or injecting a cleaning agent into the case 10 ) When the foreign matter inside the mesh or the mesh can be washed, and also the foreign matter collected in the collection portion (12a) can be easily removed through the outlet (12b) installed on the bottom of the lower case (12). In particular, the injection network 50 takes the most foreign matter in its position and should be cleaned or replaced from time to time, in the case of the oil separator for the cooling device according to the present invention in the inlet pipe 20, the injection network 50 is separable It is coupled with a screw fastening method and can be taken out of the case 10 so that it can be cleaned or replaced very easily.

As described above, the oil separator for a cooling apparatus according to the present invention filters the oil and foreign substances contained in the gas refrigerant discharged from the compressor with the injection network 50 and the filter net 60 and the filter plate having an optimal porosity and volume. 70) can be separated through at least three stages of filtration, such that only a gaseous refrigerant can be supplied to the condenser. In addition, the outflow pipe 30 and the spraying network 50 can be separated from the case 10 so that the naked eye can be checked inside the case 10 and a discharge port for removing foreign substances or oil is provided at the bottom of the lower case 12. It is very easy to clean.

As described above, the oil separator for a cooling device according to the present invention can filter most oil and foreign substances from the refrigerant without a pressure drop of the refrigerant because the filtration means is set to an optimum standard, and through the outlet installed in the bottom of the lower case Foreign substances stuck to each part such as filter net can be easily removed by using high pressure air or cleaning agent. Therefore, when the oil separator for the cooling device according to the present invention is applied to the cooling device, it is possible to suppress the decrease in the cooling performance and the compressor life that may be caused by the refrigerant circulation cycle of the oil or foreign matter or the refrigerant pressure drop of the oil separator. Therefore, it can greatly contribute to maintaining the cooling performance of the cooling device and extending the life of the compressor.

Claims (6)

A case 10 forming a sealed space, an inlet tube 20 and an outlet tube 30 respectively installed on one side and the ceiling of the case, and horizontally coupled to the tip of the inlet tube in the case through the inlet tube; A spraying net 50 for filtering foreign substances while injecting the high-pressure refrigerant introduced in all directions, and a shielding plate 80 for shielding the upper portion of the spraying network so that the coolant sprayed from the spraying network is not directly sprayed to the upper discharge side. And a fixing frame 41 seated in the lower case, and a coil wound around the fixing frame, the tip of which is disposed at the bottom of the case, and the end of which is connected to the suction side of the compressor, and the oil accumulated on the bottom of the case 10 is a compressor. An induction oil recovery pipe (40) and a filtering network for filtering oil from the refrigerant flowing into the discharge pipe after being injected from the injection network between the injection network and the discharge pipe In the oil separator for a cooling device comprising a sieve (60) and a filtering plate (70) for filtering foreign matter contained in the refrigerant flowing in the discharge pipe through the filtration net and is installed on the filtration net, The filter mesh 60 is composed of an upper mesh 61 disposed above the spray network and a lower mesh 62 disposed below the spray network, wherein the upper mesh has a ratio of height to diameter (h / d). ) Is 0.4 to 0.6, the porosity of each network is 95 to 99%, oil separator for a cooling device. The method of claim 1, The front end inlet of the oil return pipe, the oil separator for the cooling device, characterized in that it is placed in the collecting portion (12a) formed concave in the bottom of the lower case (12). delete The method according to claim 1 or 2, The oil return pipe (40) is an oil separator for a cooling device, characterized in that a capillary tube having an inner diameter of 1 to 1.5 mm having a total length of 3000 to 4000 mm. delete The method according to claim 1 or 2, The filter plate 70 is a oil separator for a cooling device, characterized in that the porous plate 71 is formed with a through hole (71a) of 5 mm or more in diameter, 50 to 150 mesh screen 72 bonded to the porous plate .

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