JP2003294340A - Replenishing device of refrigerating machine oil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a replenishing device of refrigerating machine oil usable without being restricted by an installing place, allowing deaeration without sending gas in a liquid chamber filled with replenishing oil, and adaptable to field work. <P>SOLUTION: A cylinder 17 is composed of a case 16 sealed from the outside and a cover body 18, and is separated into a gas chamber A and the liquid chamber B by a piston 19. The volume of the respective chambers A and B is varied by displacement of the cylinder 17. A gas chamber pressure reducing valve 21 connectable to a vacuum pump for reducing pressure in the gas chamber A is connected to the case 16. A gas chamber pressurizing valve 22 connectable to a compressor 1 for pressurizing pressure in the gas chamber A is connected to the case 16. A liquid chamber deaerating valve 23 connectable to the vacuum pump for reducing pressure in the liquid chamber B is connected to an upper position of the cover body 18. An oil can 114 filled with replenishing refrigerating machine oil 120 and a liquid chamber replenishing oil sucking- delivery valve 24 switchable-connectable to a crankcase 6 are connected to a lower position of the cover body 18. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable replenishing device for replenishing a refrigerating machine compressor (for example, a crank chamber of a compressor or a motor bearing portion) with refrigerating machine oil during maintenance of a refrigerating machine.

[0002]

2. Description of the Related Art Conventionally, it is necessary to additionally fill a crank chamber of a compressor provided in a refrigerator, a motor bearing portion and the like (refrigerator oil replenishing portion) with lubricating oil in order to keep an appropriate amount of lubricating oil. . This is because the oil dissolves in the refrigerant, and the oil accumulates in the evaporator, the condenser, the piping, and the like.

On the other hand, as described above, the oil dissolves in the refrigerant and is supplied to the refrigerant piping system as it is. Therefore, if moisture or air enters the oil, the refrigerant circuit is clogged or the oil film on the sliding portion is broken. Since seizure will occur, it is necessary to replenish the oil by removing air containing water from the oil.

FIG. 4 and FIG. 5 show an example of deaeration in such a refrigerator (see Japanese Patent Laid-Open No. 7-27452), FIG. 4 is a piping diagram of essential parts of a refrigerator oil filling device, and FIG. It is a refrigerator circuit diagram provided with a refrigerator oil filling device.

As shown in FIG. 5, Japanese Unexamined Patent Publication No. 7-27452.
The refrigerator circuit disclosed in the publication is a compressor 101, an oil separator 102 connected to the discharge side of the compressor 101 and having an oil separator 102a and an oil tank 102b, and a check valve 10.
3, water-cooled condenser 104, dryer 10 for adsorbing moisture
5, an expansion mechanism 106 including a plurality of electronic valves (not shown), and a full liquid evaporator 107 are circulated and connected in this order by refrigerant pipes.

The oil tank portion 102b is connected to the compressor 101 via an oil filter 108. The oil filling tank unit 109 is located above the oil tank portion 102b.
Are arranged.

As shown in FIG. 4, an oil filling tank unit 109 which constitutes a refrigerating machine oil filling device has a tubular body 10 as shown in FIG.
It is composed of a pressure vessel in which lids 109b and 109c are fixed to the upper and lower sides of 9a by welding or the like.

On the cylindrical body 109a, a pair of upper and lower unit mounting legs 109d and 109e and oil surface observation windows 109f and 1 are provided.
And 09 g are provided. A heating source 111, which is an electric heater connected to a power source 110, is wound around the outer circumference of the tubular body 109a. Further, the tubular body 10
An oil filling port 109h is provided below 9a. A conduit 113 having a shutoff valve 112 is connected to the oil filling port 109h. The tip of the conduit 113 faces the inside of the oil can 114 (the inside of the oil 120) filled with the replenishing refrigerating machine oil (oil) 120.

The lower take-out port 1 is provided on the lower lid 109b.
09i is provided. This lower ejection port 109i
Is connected to the bottom portion of the oil tank portion 102b via the supply valve 115.

An upper pressure equalizing port 1 is provided on the upper lid 109c.
09j is provided. This upper pressure equalizing port 109j
Is connected to the oil separator 102 and the check valve 10 via the pressure equalizing valve 116.
3 is connected to the refrigerant pipe. Also, the lid 10
An air vent port 109k is provided at 9c. The degassing port 109k is connected to the decompression pump means 118 via the closing valve 117.

The decompression pump means 118 is composed of a vacuum pump for decompressing the inside of the oil-filled tank unit 109 to evaporate the contained water from the filled oil and to discharge this water.

In such a structure, the replenishing valve 115 and the pressure equalizing valve 116 are closed, and the closing valves 112 and 11 are closed.
By opening 7 and driving the decompression pump means 118, the oil 120 filled in the oil can 114 is filled into the oil filling tank unit 109.

Further, this oil filling tank unit 109
When the oil 120 is filled with the oil, the closing valve 112 is closed and the pressure reducing pump means 118 is driven toward the higher vacuum side, whereby the internal pressure of the oil filling tank unit 109 is further reduced, and the oil 120 The water contained in is evaporated and discharged to the outside.

At this time, by energizing the heating source 111 at the same time, evaporation of water from the oil 120 can be promoted. In this way, moisture is removed from the oil 120 filled in the oil filling tank unit 109.

After the deaeration process, the closing valve 117 is closed and the supply valve 115 and the pressure equalizing valve 116 are opened, so that the oil 120 containing almost no water is supplied to the oil tank portion 102b by its own weight. It

In addition to the case where the refrigerating machine oil 120 is additionally replenished, water can be removed from oil (circulating oil) circulating in a refrigerant piping system different from the replenishing oil 120.

In this case, the closing valve 112 and the pressure equalizing valve 11
6 is closed, the replenishing valve 115 and the closing valve 117 are opened, and the decompression pump means 118 is driven, whereby the circulating oil can be sucked from the oil tank portion 102b into the oil filling tank unit 109, and then replenishment is performed. Valve 1
By closing 15 and further driving the vacuum pump means 118, water can be removed from the circulating oil.

In this way, by returning the circulating oil from which moisture has been removed by the degassing process to the refrigerant piping system again, it is possible to favorably cope with a case where the dryer 105 is out of order and the moisture adsorption performance is deteriorated.

By the way, in the technique disclosed in Japanese Patent Laid-Open No. 7-27452 as a technique for replenishing the refrigerating machine oil 120 described above, the decompression pump means 118 is driven after controlling the opening / closing of each valve 112, 115, 116, 117. Oil can 1
Oil filling tank unit 10
9, the closing valve 112 is closed and the decompression pump means 118 is driven further toward the high vacuum side to reduce the internal pressure of the oil filling tank unit 109 to be contained in the oil 120. The water that has been left is evaporated and degassed, and then the oil 120 is struck by its own weight.
Although it is supplied to the b side, for the compressor 101,
The filling tank unit 109 is not installed, and a portable manual pressure pump (not shown) is used to replenish the refrigerating machine oil that is not deaerated.

FIG. 3 shows such an arrangement as disclosed in JP-A-7-27452.
FIG. 7 is a refrigerant circuit diagram for replenishing refrigerating machine oil to a piston-crank type compressor of a refrigerating machine by using a manual pressurizing pump, as in the case of No.

In FIG. 3, 1 is a compressor for compressing a refrigerant, and 2 is a condenser. The refrigerant becomes a high-pressure gaseous state between the compressor 1 and the condenser 2. Reference numeral 3 is an expansion valve that controls the pressure reduction and flow rate, and 4 is an evaporator that heats the refrigerant with water.

The compressor 1 is composed of a cylinder portion 5, a crank chamber 6, and an electric motor portion 7. The electric motor portion 7 rotates a crankshaft and reciprocates a plurality of pistons in the cylinder to cause refrigerant to flow in the electric motor portion 7. Cylinder part 5 is drawn while cooling the electric motor (not shown) through the room.
It is compressed and circulated.

Reference numerals 5a, 6a and 7a are check valves attached to the compressor 1 for connecting to an external hose or the like. The check valve 5a is a high pressure cylinder section 5, and the check valve 6a is a low pressure crank chamber 6. The check valve 7a is connected to bearing oil supply (not shown) of the low-voltage electric motor section 7.

Reference numeral 8 is an oil tank for containing refrigerating machine oil (oil) 120, 9 is a manual pressure pump for sucking the oil 120 inside by operating the ball handle 9a by moving the handle 10 in the vertical direction, and 11 is a check valve. The valve 12 is a pressure gauge.
Reference numeral 13 is an oil charge hose connected to the check valve 6a connected to the crank chamber 6, and reference numerals 14 and 15 are manual opening / closing valves.

When the oil 120 is supplied to the crank chamber 6, the compressor 1 is stopped, and then the air in the pump and the pipe is purged (the air in the pipe and the container is expelled and filled with the refrigerant and the oil). (Or a vacuum state), the oil 120 contained in the oil tank 8 is sucked up by the pressure pump 9, and the oil 120 in the pressure pump 9 is filled in the oil charge hose 13.

When the oil 120 overflows from the tip of the oil charge bose 13, the check valve 6 connecting the tip of the oil charge hose 13 to the crank chamber 6 is provided.
Connect to a. When this connection is completed, the level display of the pressure gauge 12 shows the pressure value in the crank chamber 6. From this state, the oil 120 is pumped by further moving the handle 10 in the vertical direction.

[0027]

By the way, in the replenishment of the oil 120 in the refrigerator described above, the oil 120 which has not been deaerated is replenished to the compressor 1 and a manual pressure pump is used. Since No. 9 is used, there has been a problem that the air purge inside the pump and the pipe is likely to be insufficient.

On the other hand, in place of the manual type shown in FIG. 3, it is conceivable that the compressor 1 is replenished with oil by the filling tank unit 109 disclosed in JP-A-7-27452. Since the unit 109 is configured to supply the degassed oil 120 by its own weight,
There is a problem that there is a restriction on the installation place that the replenishment tank unit 109 has to be arranged above the compressor 1.

When the replenishment tank unit 109 disclosed in Japanese Patent Application Laid-Open No. 7-27452 is used to forcibly supply the oil 120 without depending on its own weight, a pressurizing means such as a supply pump is provided on the lid 109c side. By providing a gas pressure in the tubular body 109a by this pressurizing means, the oil 120 in the tubular body is supplied via the lower take-out port 109i.

However, in such a structure, a pressurizing means is newly required, and the oil 1 in the cylindrical body 109a is added.
Since 20 needs to be degassed, an inert gas such as nitrogen having a low water content must be used as its gas pressure, and nitrogen having a low water content is prevented while preventing the oil 120 in the cylindrical body 109a from being stirred. There is a new problem that it is not suitable for on-site work, such as the need to gradually pressurize an inert gas such as.

That is, when the oil 120 in the tubular body 109a is agitated, bubbles are trapped in the oil,
Not only does it take time for the air bubbles in the oil to rise and to be degassed, but it also causes seizure due to running out of oil in the sliding portion.

In order to solve the above-mentioned problems, the present invention can be used without being restricted in the place of installation, and can be evacuated without sending gas into the liquid chamber filled with replenishing oil. It is an object of the present invention to provide a refrigerating machine oil replenishing device which can be adapted to the field work.

[0033]

In order to achieve the above object, a refrigerating machine oil replenishing device of the present invention separates a case body sealed from the outside and a gas chamber and a liquid chamber from the inside of the case body. A partition for varying the volume of both chambers, a gas chamber pressure reducing valve that is connected to the case body and is connectable to a pressure reducing device for reducing the pressure in the gas chamber,
A gas chamber pressurizing valve that is connected to the case body and is connectable to a pressurizing device for pressurizing the pressure in the gas chamber; and a pressure in the liquid chamber that is connected to a position above the case body and reduces the pressure in the liquid chamber. A liquid chamber venting valve that can be connected to a decompression device, an oil can that is connected to the lower position of the case body and is filled with replenishing refrigerating machine oil, and can be switched and connected to the refrigerating machine oil replenishing section of the refrigerating machine compressor. A liquid chamber replenishment oil suction / discharge valve.

In such a refrigerating machine oil replenishing device, the inside of the case body, which is sealed from the outside, is separated by a partition into a gas chamber and a liquid chamber, and the displacement of each chamber changes the volume of each chamber. A gas chamber pressure reducing valve that can be connected to a pressure reducing device for reducing the pressure in the room is connected to the case body, and a gas chamber pressing valve that can be connected to a pressure device for increasing the pressure in the gas chamber is the case body. Connected to the
A liquid chamber degassing valve that can be connected to a pressure reducing device for reducing the pressure in the liquid chamber is connected to the upper position of the case body, and is used for an oil can filled with replenishing refrigerating machine oil and a refrigerating machine oil replenishing section of a refrigerating machine compressor A switchable connectable gas chamber replenishment oil suction / discharge valve is connected to a lower position of the case body.

As a result, the gas chamber and the liquid chamber are decompressed / pressurized by the connection and opening / closing of each valve, and the partition walls change the volumes of the gas chamber and the liquid chamber according to the pressure difference, whereby the oil It is possible to suck the oil from the can into the gas chamber, degas the oil from the gas chamber, and discharge the oil from the gas chamber to the refrigerating machine oil replenishing unit.

Further, the present invention is characterized in that the partition wall is displaceable in the case body so as to relatively change the volumes of the gas chamber and the liquid chamber by opening and closing the valves.

Further, the present invention is characterized in that the pressurizing device is a refrigerator compressor, and the gas chamber pressurizing valve is connectable to a high pressure side check valve thereof.

[0038]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a refrigerating machine oil replenishing device of the present invention will be described with reference to the drawings.

FIG. 1 is a vertical sectional view of a refrigerating machine oil replenishing apparatus according to the present invention.

In FIG. 1, a replenishing device 100 includes a case 16 having a bottomed cylindrical shape, a circular cylinder 17 formed in the case 16, and a closed end of the case 16 to close the inside of the cylinder 17 from the outside. The lid 18 for sealing and the inside of the cylinder 17 are divided into a gas chamber A on the back side (left side in the drawing) and a liquid chamber B on the front side (right side in the drawing) in an isolated state, and the pressure between the gas chamber A and the liquid chamber B is divided. A piston 19 that is displaced along the axial direction due to a difference and a piston ring 20 such as an O-ring for sealing provided on the outer wall of the piston 19 are provided. The case 16 and the lid 18 form a case body.

A pair of valves 21 and 22 connected to the gas chamber A are provided in parallel above and below the bottom 16a of the case 16.

Valve 21 as a valve for depressurizing the gas chamber
Is connected to a vacuum pump (pressure reducing device) not shown,
The gas chamber A is decompressed by driving the vacuum pump with the valve 21 opened, and the piston 19 is displaced toward the bottom portion 16a (the volume of the gas chamber A becomes narrower and the volume of the liquid chamber B becomes smaller at the same time. Becomes wider).

Valve 22 as valve for pressurizing gas chamber
Is the check valve 5a on the high pressure side of the compressor 1 via the hose 31.
It is possible to connect with. A valve 32 is provided in the middle of the hose 31.

A valve 2 for replenishing oil is located on the lid 18 when the replenishing device 100 is installed horizontally.
3 and a valve 24 for sucking / discharging the replenishing oil of the liquid chamber, which is located at the bottom when the replenishing device 100 is installed in a horizontal state.

Valve 23 as a valve for degassing the liquid chamber
Is connected to a vacuum pump (not shown) (which may be the same as or different from the above vacuum pump), and the liquid chamber B is depressurized by driving the vacuum pump with the valve 23 opened, whereby the piston 19 is It is displaced toward the lid 18 side (the volume of the liquid chamber B becomes narrower and the volume of the gas chamber A becomes wider at the same time). The details will be described in the degassing process with reference to FIG.

The pressures in the gas chamber A and the liquid chamber B can be confirmed by the pressure gauges 25 and 26 connected in front of the valves 21 and 22 and the valve 23.

Peep windows 27 to 29 are provided above the bottom portion 16a and above and below the lid body 18. The viewing window 27 is mainly used to confirm (visually) the position of the piston 19, and the viewing windows 28 and 29 are used to confirm (visually) the amount of the oil 120 in the liquid chamber B.

Next, the refrigerating machine oil replenishing apparatus 100 of the present invention.
The operation and the procedure of replenishment will be described with reference to FIG.

FIG. 2 (A) is an explanatory diagram for filling the replenishing device with oil from an oil can, FIG. 2 (B) is an explanatory diagram for bleeding air from the oil filled in the replenishing device, and FIG. 2 (C). It is explanatory drawing which replenishes the crank chamber of a compressor with the deaerated oil.

First, referring to FIG. 2A, the oil can 1
A description will be given of filling the replenishing device 100 with oil 120 from 14.

Add oil 1 from the oil can 114 to the refill device 100.
In order to fill 20, the liquid chamber replenishment oil suction / discharge valve 24 and the oil can 1 via the oil charge hose 13
After connecting with 14, the valves 22 and 23 are closed, the valve 21 is connected to a vacuum pump (not shown), and the gas chamber A on the inner side of the cylinder 17 is sucked by the vacuum pump.

At this time, since the piston 19 is displaced to the back side, the liquid chamber B on the front side of the cylinder 17 becomes negative pressure, whereby the oil 120 in the oil can 114 is sucked and the oil 120 in the liquid chamber B is sucked. Is filled.

When it is confirmed that the filling amount of the oil 120 is appropriate (confirmed through the sight windows 28, 29), the valve 21,
24 is closed. If it is desired to further fill the oil 120, the valve 21 is opened, the liquid chamber replenishing oil suction / discharge valve 24 is temporarily closed, and the valve 23 is evacuated.
After the piston 19 is moved to the lid 18 side, the piston 19 is filled by the above procedure.

Next, deaeration will be described with reference to FIG.

The valves 21, 22, 23 and 24 are closed, and the check valve 6a connected to the liquid chamber replenishment oil suction / discharge valve 24 and the crank chamber 6 of the compressor 1 is connected by the oil charge hose 13.

Since the pressure in the oil charge hose 13 rises to the pressure in the crank chamber 6, the liquid chamber replenishing oil suction / discharge valve 24 is opened and instantly closed, and the oil charge hose 13 is air-purged. Then, the valve 23 is opened to evacuate the oil charge hose 13
The inside is air-purged, and the oil 120 in the replenishing device 100 is also degassed.

Next, the degassed oil 1 based on FIG. 2 (C)
A case where 20 is replenished in the crank chamber 6 of the compressor 1 will be described.

When the evacuation described above is completed, the valve 23 is closed, and the valve 22 and the check valve 5a on the high pressure side of the compressor 1 are connected by the hose 31.

Next, after opening the valve 32 provided in the middle of the hose 31 and gradually opening the valves 22 and 24, the pressure on the high pressure side of the compressor 1 is 1.5 to 2 MPa.
The gas chamber A is filled with the oil and the crank chamber 6 connected to the check valve 6a has a pressure of about 0.4 MPa.
Are replenished into the crank chamber 6.

At this time, since the piston 19 exists, the phenomenon that the oil 120 in the liquid chamber B is agitated and bubbles up does not occur.

Further, when the replenishment of the oil 120 to the crank chamber 6 is completed, the valves 24 and 32 are closed and the hose 3 is closed.
1 and the gas in the gas chamber A is recovered from the valve 21 by the refrigerant recovery device until the pressure in the gas chamber A becomes close to the atmospheric pressure.

Finally, the oil charge hose 13 is removed from the check valve 6a while the liquid chamber replenishment oil suction / discharge valve 24 is closed, and the oil 120 in the oil charge hose 13 is removed.
And the work is completed.

As described above, the degassed oil 120 can be replenished to the crank chamber 6 by utilizing the differential pressure between the high pressure and the low pressure of the compressor 1.

By the way, during the above-mentioned work, the position of the piston 19 can be visually checked through the sight window 27, and the oil 1
The filling amount (oil level) of 20 can be visually checked through the sight windows 28 and 29, and the pressures of the gas chambers A and B can be checked by the pressure gauge 2
It is possible to visually check by 5, 5, and the situation can be easily confirmed.

A technique utilizing the pressure on the high pressure side of the compressor 1 when replenishing the degassed oil 120 to the crank chamber 6 of the compressor 1 has been described with reference to FIG. 2C. The means for pressurizing the gas chamber A of 100 is not limited to the pressure on the high pressure side of the compressor 1, but 0.4 MPa of the crank chamber 6 is used.
Since any compressed gas having a pressure of about a or higher may be used, the same action and effect can be obtained even if it is connected to a compressed air cylinder (not shown).

Further, in the replenishing device 100 of the present invention, the high pressure side of the compressor 1 is used as a pressurizing device for the gas chamber A instead of replenishing the oil 120 by its own weight. It is difficult to be restricted by the above and can be provided with portability.

Further, since it is not necessary to fill the liquid chamber B with a gas such as gradually pressurizing an inert gas such as nitrogen having a small water content, sufficient deaeration can be performed.

[0068]

Since the refrigerating machine oil replenishing apparatus of the present invention is configured as described above, it can be used without any restrictions on the installation location and is filled with replenishing oil. It is possible to degas without sending gas into the liquid chamber, which makes it suitable for field work.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a refrigerating machine oil replenishing device according to an embodiment of the present invention.

FIG. 2A is an explanatory view of filling the replenishing device with oil from an oil can, FIG. 2B is an explanatory view of deaerating air from the oil filled in the replenishing device, and FIG. It is explanatory drawing replenished to the crank chamber of a compressor.

FIG. 3 is a refrigerant circuit diagram showing a conventional refrigerating machine oil replenishing device, in which refrigerating machine oil is replenished by using a manual pressure pump in a piston-crank compressor of the refrigerator.

4 is a piping diagram of essential parts of another conventional refrigerating machine oil filling device shown in FIG.

FIG. 5 is a refrigerator circuit diagram of another conventional refrigerator oil filling device.

[Explanation of symbols]

1 compressor, 6 crank chambers (refrigerator oil replenishment section), 13
Oil chassis hose, 16 case (case body), 17 cylinder (case body), 18 lid (case body), 19 piston (partition wall), 20 piston ring, 21 valve (gas chamber pressure reducing valve), 22
Valve (gas chamber pressurizing valve), 23 valve (liquid chamber venting valve), 24 liquid chamber replenishing oil suction / discharge valve, 25 pressure gauge, 26 pressure gauge, 27 peep window, 28
Peep window, 29 Peep window, 31 Hose, 100 Replenishing device.

Claims (3)

[Claims] 1. A case main body which is sealed from the outside, a partition wall which separates the inside of the case main body into a gas chamber and a liquid chamber, and which allows the volumes of both chambers to be varied, and the gas which is connected to the case main body. A gas chamber pressure reducing valve that can be connected to a pressure reducing device for reducing the pressure in the chamber, and a gas chamber pressurizing device that is connected to the case body and can be connected to a pressure device for increasing the pressure in the gas chamber. A valve and a valve for venting a liquid chamber, which is connected to a position above the case body and is connectable to a pressure reducing device for reducing the pressure in the liquid chamber,
An oil can connected to a lower position of the case main body and filled with replenishing refrigerating machine oil, and a liquid chamber replenishing oil suction / discharge valve switchably connectable to a refrigerating machine oil replenishing portion of a refrigerating machine compressor are provided. Refrigerating machine oil replenishing device characterized by the above. 2. The partition wall is displaceable in the case body so that the volumes of the gas chamber and the liquid chamber can be relatively changed by opening and closing the valves. Refrigerating machine oil replenishing device. 3. The gas chamber pressurizing valve is connectable to a high-pressure side check valve of the pressurizing device, which is a refrigerator compressor. Refrigerating machine oil replenishing device described.