JPH05296173A - Automatic drain discharge device for oil-cooled rotary compressor - Google Patents

Abstract

PURPOSE:To enable the automatic and positive discharge of drain, sunk below an oil separator, during the operation of a compressor. CONSTITUTION:A drain separating chamber 10 is provided below an oil separator 3 connected to the discharge port of a rotary compressor body, and the drain separating chamber 10 is provided with a first drain sensor 15. A drain communicating passage 13 is provided in such a way that one end 14 is communicated with the lower part of the drain separating chamber 10 while the other end 16 is communicated with a drain chamber 18, and a discharge passage 26 is provided in such a way that one end 27 is communicated with the drain chamber 18 while the other end is communicated with the outside. The drain communicating passage 13 is provided with a first solenoid switching valve 22, and the discharge passage 26 is provided with a second solenoid switching valve 30. A control device is provided to open the first solenoid switching valve 22 and the second solenoid switching valve 30 selectively by the first drain sensor 15. The drain D can be thereby discharged outside automatically and positively even during the operation of a compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic drain discharge device for an oil-cooled rotary compressor which can separate and automatically discharge drain mixed in lubricating oil during operation of the rotary compressor.

[0002]

2. Description of the Related Art Conventionally, as a method of discharging the drain contained in the oil of a refueling type rotary compressor, when the compressor is stopped, the drain valve below the oil separator is manually opened to discharge it. If it is difficult to stop the machine,
The method of opening and closing the solenoid valve at regular intervals and discharging it is used. Japanese Utility Model Publication No. 59-12969 discloses an oil tank and a drain separation chamber containing a reed switch including a float, which are connected by two pipes, and a circulation pump is provided in the middle of one pipe. Then, the lubricating oil mixed with the drain in the oil tank is introduced into the float chamber and separated into the lubricating oil and the drain due to the difference in specific gravity in the drain separation chamber, the lubricating oil is filtered and sent back to the oil tank, and the drain floats. However, it is disclosed that when the water level rises to a certain level, the reed switch opens a normally closed electromagnetic valve communicating with the lower part of the drain separation chamber to automatically discharge the drain to the outside.

[0003]

In the above prior art, the reed switch including the float detects the drain to open the normally closed solenoid valve, and the drain separation chamber in the high pressure state and the outside in the atmospheric pressure state. The drainage is automatically discharged to the outside by utilizing the pressure difference of the Not only may the lubricating oil be discharged to the outside. For this reason, the area of the passage of the normally closed solenoid valve is made small, or an orifice is provided in a pipe or the like to circulate a small amount of lubricating oil to prevent the lubricating oil from being discharged to the outside. However, when the area of the passage of the normally closed solenoid valve is reduced in this way or when an orifice is provided in the pipe or the like, the passage of the normally closed solenoid valve and the orifice are clogged and malfunction such as clogging occurs. May occur.

The present invention solves the above problems and eliminates malfunctions such as clogging, and also enables automatic drainage of drainage even when the compressor is in operation, and an automatic drain for an oil-cooled rotary compressor. The purpose is to provide an ejector.

[0005]

According to a first aspect of the present invention, there is provided an automatic drain discharge device for an oil-cooled rotary compressor which separates and discharges drain mixed in lubricating oil of a rotary compressor body. A drain separation chamber that communicates below an oil separator that is connected to the discharge port of the rotary compressor body, a first drain sensor provided in the drain separation chamber, and one end that communicates with the lower portion of the drain separation chamber. A drain communication passage having an end communicating with the drain chamber; a discharge passage having one end communicating with the drain chamber and the other end communicating with the outside; a first automatic opening / closing valve provided in the drain communication passage; A second automatic opening / closing valve provided in the discharge path,
It is provided with a control device for selectively opening the first automatic opening / closing valve and the second automatic opening / closing valve by the first drain sensor.

According to a second aspect of the present invention, in an automatic drain discharge device for an oil-cooled rotary compressor that separates and discharges the drain mixed in the lubricating oil of the rotary compressor body, the discharge of the rotary compressor body is provided. A drain separation chamber communicating below the oil separator connected to the outlet via a drain / lubricating oil communication passage, one end of which communicates with the upper portion of the drain separation chamber, and the oil reservoir of the oil separator and the rotary compressor body. A circulation passage having the other end communicating with an inlet-side oil passage of an oil cooler provided in the middle of an oil supply passage interposed between the oil supply inlets, a first drain sensor provided in the drain separation chamber, and A drain communication passage having one end connected to the lower portion of the drain separation chamber and the other end connected to the drain chamber; a discharge passage having one end connected to the drain chamber and the other end connected to the outside; First automatic opening / closing valve provided in the communication passage for the connection, a second automatic opening / closing valve provided in the discharge passage, the first automatic opening / closing valve and the second automatic opening / closing valve by the first drain sensor. And a control device for selectively opening. According to a third aspect of the present invention, one end of the circulation path is opened to an upper central portion of the drain chamber, and a check valve is provided in the middle of the circulation path. According to a fourth aspect of the present invention, the drain chamber has an inner wall formed in a substantially cylindrical shape, and the other end of the drain communication passage is opened in a tangential direction of the inner wall.

Further, in the present invention according to claim 5, the volume of the drain chamber is at least smaller than the volume between the lower portion of the first drain sensor of the drain separation chamber and one end of the drain communication passage. Is. According to a sixth aspect of the present invention, a second drain sensor is provided in the drain chamber, and the second drain sensor is used when the second drain sensor is not detected.
The control device is provided with an interlock circuit so that the automatic opening / closing valve of (3) is closed, and an alarm means is connected to the interlock circuit. According to a seventh aspect of the present invention, the control device is connected in parallel to a starting device of a drive motor of the rotary compressor body. According to the present invention of claim 8, an electric heater for heat insulation is mounted in the vicinity of the drain chamber.

[0008]

According to the structure of the present invention as set forth in claim 1, when drain is accumulated in the drain separation chamber, the first automatic open / close valve is opened by the first drain sensor and the drain is introduced into the drain chamber. After that, the first automatic opening / closing valve is closed and the second automatic opening / closing valve is opened, so that the drain in the drain chamber is discharged to the outside.

According to the configuration of the present invention described in claim 2, the lubricating oil separated in the drain chamber can be collected in the oil cooler via the circulation path. According to the configuration of the present invention described in claim 3, the lubricating oil in the drain chamber can be reliably recovered through the circulation path. According to the configuration of the present invention described in claim 4, the lubricating oil introduced into the drain chamber together with the drain is reliably separated by the centrifugal action.

Further, according to the structure of the present invention described in claim 5, only the drain accumulated in the drain separation chamber can be reliably introduced into the drain chamber. According to the configuration of the present invention described in claim 6, the introduction of the lubricating oil into the drain chamber can be detected by the second drain sensor, and the discharging of the lubricating oil can be prevented. According to the configuration of the present invention described in claim 7, it is possible to share devices around the control device and the drive motor starting device. According to the configuration of the present invention described in claim 8, freezing of the drain of the drain chamber at low temperature can be prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, an oil separator 3 is connected to a discharge port 2 of a rotary compressor body 1 of an oil-cooled rotary compressor via a pipe 4. An oil separator 5 is attached to the upper part of the receiver tank 3, and the compressed air A discharged from the rotary compressor body 1 together with the lubricating oil O passes through the oil separator 5 and is supplied to the consumer side 6. .. On the other hand, the lubricating oil O accumulated in the oil separator 3 is pressure-fed and supplied from the oil reservoir 50 to the oil supply inlet 9 of the rotary compressor body 1 through the oil supply passage 8 provided with the oil cooler 7. Further, a drain separation chamber 10 is provided below the oil sump 50 of the oil separator, one side of the drain separation chamber 10 is connected to an automatic drain discharge device body 11, and the other is connected to a manual discharge valve.
12 are connected.

As shown in FIGS. 2 to 5, the drain separation chamber 10 is formed by recessing the bottom portion of the oil separator 3, and a drain communication passage 13 is formed from the center of the side wall thereof. It extends to the center of 10 and is bent downward to open one end 14. Further, a lubricating oil O is provided on the side wall of the drain separation chamber 10 located slightly above the one end 14.
And a first drain sensor 15 utilizing the fact that the electric resistance of the drain D is different. The height H between the one end 14 and the first drain sensor 15 and the drain separation chamber 10
Is set so that the product by the height H of the one end 14 and the first drain sensor 15 is larger than the drain discharge amount per time described below. The other end 16 of the drain communication passage 13 is connected to a drain chamber 18 which is vertically provided in a drain chamber block 17. That is, in the drain chamber block 17, the other end 16 side of the drain communication passage 13 first passes through the manual three-way switching valve 19 mounted on the drain chamber block 17, and then the drain chamber block.
An inlet of a first electromagnetic opening / closing valve 22 which is a first automatic opening / closing valve through a first communication hole 21 provided with a strainer 20 provided in 17.
The second end 16 is connected to the outlet 24 of the first electromagnetic on-off valve 22 via the second communication hole 25 and to the upper portion of the drain chamber 18. Further, one end 27 of the discharge passage 26 is connected to the lower portion of the drain chamber 18, and the other end 28 of the discharge passage 26 is connected to the outside. That is, it is connected to the inlet 31 of the second electromagnetic on-off valve 30, which is the second automatic on-off valve, through the first discharge hole 29 in the lower part of the drain chamber 18, and further to the outlet 32 of the second electromagnetic on-off valve 30. The other end 28 is opened to the outside through the second discharge hole 33.

Further, a starting device 35 for a motor 34 for driving the rotary compressor body 1 and the first drain sensor
A control device 36 for connecting the first electromagnetic on-off valve 22, the second electromagnetic on-off valve 30 and performing the operation described later is connected in parallel.

Next, the operation of the above configuration will be described with reference to FIG. When the rotary compressor body 1 is rotated by the start of the motor 34, the lubricating oil O and the compressed air A are discharged from the discharge port 2 to the oil separator 3 in a mixed state, and the lubricating oil O is stored in the oil reservoir of the oil separator 3. Accumulate to 50. At the same time, the condensed water in the compressed air A is mixed into the lubricating oil O and becomes drain D, which sinks to the lower part of the oil reservoir 50 due to the difference in specific gravity and then to the drain separation chamber 10. When the height of the drain D accumulated in the drain separation chamber 10 reaches the first drain sensor 15, the first drain sensor 15 detects the drain D. By this detection operation, the valve portion 22A of the first electromagnetic opening / closing valve 22 opens the outlet 24 for a predetermined time by a timer (not shown) of the control device 36. Due to this opening operation, due to the pressure difference between the drain chamber 18 and the inside of the oil separator 3 which are in a sealed and atmospheric pressure state, a predetermined amount of the drain D is transferred to the drain communication passage 13, that is, the three-way switching valve 19 and the strainer. First communication hole 21 with 20, inlet
Drain chamber through 23, outlet 24 and second communication hole 25
Introduced in 18. At this time, the drain chamber 18
The air, which has been sealed in, is reduced in volume at the upper part of the drain chamber 18 and stored in a compressed state. Then, a timer (not shown) of the control device 36 is actuated to operate the first solenoid valve 22.
Is closed, after which the timer of the controller 36 (not shown)
When the valve portion 30A of the second electromagnetic opening / closing valve 30 is retracted and the outlet 32 is opened for a predetermined time by the operation of the
The drain D stored in 18 is discharged to the outside through the discharge passage 26, that is, the first discharge hole 29, the inlet 31, the outlet 32, and the second discharge hole 33. After the drain D is discharged, the drain D slightly remains in the drain chamber 18, and
The interior is brought to the atmospheric pressure state again as the drain D is discharged. Then, when the first drain sensor 15 detects the drain D in the drain separation chamber 10, the first electromagnetic on-off valve 22 is opened and the drain D passes through the drain communication passage 13 as described above. The drain chamber 18 and then the second electromagnetic on-off valve 30 is opened to cause the drain D
Can be discharged to the outside. In order to prevent malfunctions when the first drain sensor 15 becomes defective, when the first drain sensor 15 continues to detect the drain D for a long time as shown by the one-dot chain line in FIG. Is configured to automatically open the power source of the control device 36 by operating a timer (not shown) of the control device 36. The following formula shows the discharge amount Q (cc) of the drain D per one time.

[0015]

[Equation 1]

Where a is the volume of the drain chamber 18 (c
c) and b are drains (c) remaining in the drain chamber 18.
c), P ₁ is the atmospheric pressure (kgf / cm ² abs), and P ₂ is the internal pressure of the drain chamber 18 (kgf / cm ² abs). Further, FIG. 7 shows that the capacity of the drain chamber 18 is 20 cc,
The discharge amount of the drain D per one time when the amount of drain remaining in the drain chamber 18 is 4 cc and the internal pressure of the drain chamber 18 is the same as the pressure of the oil separator 3 is shown. 15.5
(Kgf / cm ² abs) when the 8 (kbf / cm ² a
bs), the difference in the drain D discharge amount is 0.8 cc
It can be reduced to some extent.

As described above, in the above embodiment, the drain separation chamber 10 is provided below the oil separator 3 connected to the discharge port 2 of the rotary compressor body 1, and the drain separation chamber 10 is provided with the first drain sensor. Further, one end 14 is connected to the lower part of the drain separation chamber 10 and the other end 16 is connected to the drain chamber 18.
A drain communication passage 13 communicating with the drain chamber 18, a drain passage 26 communicating the drain chamber 18 with one end 27 and the other end 28 communicating with the outside, and the drain communication passage 13 having a first solenoid valve. 22 is provided, a second electromagnetic on-off valve 30 is provided on the discharge path 26, and the first drain on-off valve 22 and the second electromagnetic on-off valve 30 are selectively opened by the first drain sensor 15. By providing the control device 36 for controlling, the drain D of the drain separation chamber 10 is introduced into the drain chamber 18 in a certain amount, and then the drain D in the drain chamber 18 is discharged to surely discharge the drain D. it can.

Further, the capacity of the drain chamber 18 is set to a height H between the one end 14 and the first drain sensor 15.
And the plane area of the drain separation chamber 10, that is, the capacity due to the height H of the one end 14 and the first drain sensor 15 is set to be smaller than that of the drain D. Therefore, the possibility that even the lubricating oil O is discharged can be eliminated. Moreover, since the starting device 35 of the motor 34 for driving the rotary compressor body 1 and the control device 36 to which the first drain sensor 15 and the like are connected are connected in parallel, the size of the power supply device can be reduced.

FIGS. 8, 9, 10 and 11 show the second to fourth embodiments of the present invention, in which the same parts as those in the first embodiment are designated by the same reference numerals. Detailed description is omitted. In the second embodiment shown in FIG. 8, the drain chamber 18 is provided with a second drain sensor 41.
The second electromagnetic on-off valve 30 is opened by detecting the drain D introduced into the drain chamber 18 by the tip sensor of the drain sensor 41. Therefore, should lubricating oil be introduced into the drain chamber 18, the second drain sensor 41 detects this and the interlock circuit provided with the reset means (not shown) provided in the control device 36. (Not shown) operates to control the second solenoid on-off valve 30 so that it does not open, and the lubricating oil O
Is prevented from being discharged to the outside, and at the same time, alarm means (not shown) such as an alarm lamp and an alarm buzzer are activated to warn of an abnormality.

The third embodiment shown in FIG. 9 is a drain chamber.
An electric heater 42 for heat retention is screwed into and attached to the drain chamber block 17 in the vicinity of 18. Therefore,
When the outside air temperature is low, the heat-retaining electric heater 42 generates heat to warm the drain chamber block 17, so that the drain D in the drain chamber 18 can be reliably prevented from freezing, and the heat-retaining electric heater 42 is attached to the drain chamber block 17. Since it is embedded, the whole can be made compact.

In the fourth embodiment shown in FIGS. 10 and 11, one end 52 of the drain / oil communication passage 51 communicates below the oil separator 3 connected to the discharge port 2 of the rotary compressor body 1. The other end 53 communicates with the upper part of the drain separation chamber 10 provided in the drain chamber block 17. Then, one end 55 of the circulation path 54 communicates with the center of the upper part of the drain separation chamber 10. The other end 56 of the circulation path 54 communicates with the inlet 7A of the oil cooler 7 provided in the supply oil path 8. This portion is a portion having a pressure slightly lower than that of the drain separation chamber 10, and is also the most preferable communicating portion for the reason described below.
A strainer 20 and a manual opening / closing valve 57 are provided in the middle of the drain / lubricating oil communication passage 51. Further, a first drain sensor 15 is provided in the drain separation chamber 10 substantially at the center thereof. One end 14 of the drain communication passage 13 communicates with the lower portion of the drain separation chamber 10 and the other end 16 communicates with the drain chamber 18. The drain chamber 18 is connected to one end 27 of the discharge path 26 and the other end 28 to the outside. The drain communication passage 13 is provided with a first electromagnetic on-off valve 22, and the discharge passage 26 is provided with a second electromagnetic on-off valve 30. Further, one end 55 of the circulation path 54 is provided so as to open at the center of the upper surface of the drain chamber 18, and a check valve is provided in the middle of the circulation path 54 so that the lubricating oil O flows only from one end 55 to the other end 56. A valve 58 is provided. Further, the inner wall 18A of the drain chamber 18 is formed in a substantially cylindrical shape, and the other end 53 of the drain / lubricating oil communication passage 51 is opened in the tangential direction X of the inner wall.
The volume of the drain chamber 18 is set to be at least smaller than the volume between the first drain sensor 15 of the drain separation chamber 10 and the one end 14 of the drain communication passage 13. Therefore, the drain D that has settled down below the oil separator 3 is caused to flow from the other end 53 to the inner wall of the drain separation chamber 10 due to the pressure difference between the internal pressure of the oil separator 3 and the inlet 7A of the oil cooler 7 together with a part of the lubricating oil O. It is introduced into the drain separation chamber 10 along 10A. Drain D for this
Is gently swirled in the drain separation chamber 10 and separated from the lubricating oil O mixed in the drain D. As a result, the drain D gradually sinks along its inner wall 10A, while the lubricating oil O floats above it. And drain D is the first
When the drain sensor 15 reaches the level, the first electromagnetic on-off valve 22 is opened by detecting this and the drain D is pressure-fed to the drain chamber 18. After this, the first electromagnetic on-off valve 22 is closed and the second electromagnetic on-off valve 30 is opened, and the drain D is discharged to the outside. The first electromagnetic on-off valve 22 and the second electromagnetic on-off valve 30 are alternately opened to discharge the drain D to the outside until the first drain sensor 15 stops detecting the drain D. On the other hand, the lubricating oil O introduced and separated into the drain separation chamber 10 merges with the lubricating oil O from the supply oil passage 8 through the circulation passage 54 due to the pressure difference from the one end 55, and is sent to the oil cooler 7. After that, the oil is supplied to the rotary compressor body 1 through the oil supply passage 8 '. During this supply, the first solenoid on-off valve 22 is opened and the drain D is connected to the drain communication passage.
When it flows into the drain chamber 18 through 13 the internal pressure of the drain separation chamber 10 drops, and the lubricating oil O flows back from the inlet of the oil cooler 7 through the circulation path 54 into the drain separation chamber 10. As a result, the center of the boundary between the lubricating oil O and the drain D becomes concave due to the dynamic pressure as shown by the chain double-dashed line, and the lubricating oil portion is brought close to the inlet of the drain communication passage 13. Although there is a risk of being caught, the lubricating oil O
Backflow can be prevented.

As described above, in the fourth embodiment, the drain separation chamber 10 is provided separately from the oil separator 3 on the drain chamber block 17 side, the lubricating oil O and the drain D are introduced, and the drain D is supplied. It is introduced into the drain chamber 18 through the drain communication passage 13 provided with the first electromagnetic on-off valve 22, and the drain D of the drain chamber 18 is discharged to the outside through the discharge passage 26 provided with the second electromagnetic on-off valve 30. As a result, a certain amount of drain D in the drain separation chamber 10 is introduced into the drain chamber 18, and only the drain D in the drain chamber 18 is discharged, so that the drain D can be reliably discharged to the outside.

Further, since one end 55 of the circulation passage 54 is opened at the center of the upper portion of the drain chamber 18, the lubricating oil O in the drain separation chamber 10 is generated due to the pressure difference with the circulation passage 54.
Of the check valve 58 in the middle of the circulation path 54.
By providing the, the backflow of the lubricating oil O can be prevented.
Moreover, since the other end 53 of the drain / lubricating oil communication passage 51 flows in along the inner wall of the drain separating chamber 10 formed in a substantially cylindrical shape, the lubricating oil O and the drain D are gently swirled while draining. Centrifuged in the separation chamber 10. As a result, the drain D having a large specific gravity slowly sinks along the inner wall 10A and accumulates therebelow, and the lubricating oil O having a small specific gravity gathers in the central portion of the drain separation chamber 10, and from the other end 55 to the oil cooler 7. Since it is recovered together with the lubricating oil O that circulates through the oil, the separating action of the lubricating oil O and the drain D can be improved. In this case, if the swirling speed is too fast, the stirring effect in the drain separation chamber 10 reduces the separation effect, so the opening area of the other end 53 should be made permanently small.

The present invention is not limited to the above embodiment, and various modifications are possible, for example, the rotary compressor body 1 may be driven by an engine, and the automatic opening / closing valve may be a motor valve. Further, in the second embodiment, a second drain sensor is provided in the drain chamber, and an interlock circuit is provided in the control device so that the second electromagnetic on-off valve is closed when the second drain sensor is not detected. Alarm means may be connected to the interlock circuit.

[0025]

According to the first aspect of the present invention, a drain separation chamber communicating below an oil separator connected to the discharge port of the rotary compressor body, and a first drain sensor provided in the drain separation chamber are provided. A communication passage for communicating one end with the lower portion of the drain separation chamber and one end for communicating with the drain chamber; a discharge passage for communicating one end with the drain chamber and another end for communication with the outside; and a communication passage for the drain. A first automatic opening / closing valve provided in the discharge passage, a second automatic opening / closing valve provided in the discharge passage, and the first automatic opening / closing valve and the second automatic opening / closing valve selectively by the first drain sensor. By providing a control device that opens, only the drain based on the capacity of the drain chamber is reliably discharged, preventing environmental pollution due to lubricating oil discharge, and preventing oil consumption for maintenance. Cycle can provide long as possible oil-cooled rotary compressor.

According to a second aspect of the present invention, a drain separation chamber communicating below the oil separator connected to the discharge port of the rotary compressor body via a drain / lubricating oil communication passage, and an upper portion of the drain separation chamber are provided. A circulation path that communicates at one end with the other end communicating with the oil passage on the inlet side of the oil cooler provided in the middle of the oil supply passage interposed between the oil reservoir of the oil separator and the oil supply inlet of the rotary compressor body. A first drain sensor provided in the drain separation chamber, a drain communication passage having one end communicating with a lower portion of the drain separation chamber and the other end communicating with the drain chamber, and one end communicating with the drain chamber. And a discharge path that communicates the other end with the outside,
A first automatic opening / closing valve provided in the drain communication passage;
A second automatic opening / closing valve provided in the discharge passage;
By providing a control device for selectively opening the first automatic opening / closing valve and the second automatic opening / closing valve by the drain sensor of the above, only the drain based on the capacity of the drain chamber is reliably discharged, and By separating and collecting the lubricating oil mixed in the drain, it is possible to provide an oil-cooled rotary compressor in which consumption of the lubricating oil is prevented and the maintenance cycle is extended.

According to the third aspect of the present invention, one end of the circulation passage is opened at the center of the upper portion of the drain chamber, so that the lubricating oil can be reliably collected and a check valve is provided in the middle of the circulation passage. By being provided, the backflow of the lubricating oil can be prevented.

In the invention according to claim 4, the inner wall of the drain chamber is formed into a substantially cylindrical shape, and the other end of the drain communication passage is opened in the tangential direction of the inner wall, thereby providing lubrication. The oil and drain can be swirled to ensure separation between the two.

According to a fifth aspect of the present invention, the volume of the drain chamber is at least the first volume of the drain separation chamber.
By making the volume below the drain sensor and between one end of the drain communication passage, the drain can be discharged many times and the lubricating oil can be prevented from being discharged.

According to a sixth aspect of the present invention, a second drain sensor is provided in the drain chamber, and the control device is configured to close the second automatic opening / closing valve when the second drain sensor is not detected. By providing the interlock circuit and connecting the alarm means to the interlock circuit, even if the lubricating oil should flow into the drain chamber, it is possible to reliably prevent the lubricating oil from being discharged to the outside.

According to a seventh aspect of the invention, the control device is connected in parallel to the starting device of the drive motor of the rotary compressor main body, so that the device around the power supply is shared and the size of the device is reduced. Can be planned.

According to the eighth aspect of the present invention, the electric heater for keeping heat is mounted in the vicinity of the drain chamber, whereby the drain accommodated in the drain chamber can be reliably prevented from freezing.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a drain communication passage and a discharge passage according to the first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view around the drain separation chamber showing the first embodiment of the present invention.

FIG. 4 is a vertical sectional view around a first drain sensor showing the first embodiment of the present invention.

FIG. 5 is a plan cross-sectional view around a strainer showing a first embodiment of the present invention.

FIG. 6 is a time chart showing the first embodiment of the present invention.

FIG. 7 is a graph of drain discharge amount per time, showing the first embodiment of the present invention.

FIG. 8 is a vertical sectional view showing a second embodiment of the present invention.

FIG. 9 is a vertical cross-sectional view showing a third embodiment of the present invention.

FIG. 10 is a vertical sectional view around a drain separation chamber showing a fourth embodiment of the present invention.

FIG. 11 is a plan sectional view around a drain chamber drain showing a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Rotary Compressor Main Body 2 Discharge Port 3 Oil Separator 7 Oil Cooler 7A Inlet 8 Oil Path 10 Drain Separation Chamber 10A Inner Wall 13 Drain Communication Channel 14 One End 15 First Drain Sensor 15 16 Other End 18 Drain Chamber 18A Inner Wall 22 First Electromagnetic open / close valve (first automatic open / close valve) 26 discharge path 27 one end 28 other end 30 second electromagnetic open / close valve (second automatic open / close valve) 34 motor 35 starter 36 controller 41 second drain sensor 41 42 Electric Heater for Keeping Heat 50 Oil Reservoir 54 Circulating Path 55 One End 56 Other End 58 Check Valve D Drain 0 Lubricating Oil

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[Procedure amendment]

[Submission date] September 3, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art Conventionally, as a method of discharging drain contained in oil of an oil-cooled rotary compressor, a drain valve below an oil separator is manually opened and discharged when the compressor is stopped, or If it is difficult to suspend the compressor,
The method of opening and closing the solenoid valve at regular intervals and discharging it is used. Japanese Utility Model Publication No. 59-12969 discloses an oil tank and a drain separation chamber containing a reed switch including a float, which are connected by two pipes, and a circulation pump is provided in the middle of one pipe. Then, the lubricating oil mixed with the drain in the oil tank is introduced into the float chamber and separated into the lubricating oil and the drain due to the difference in specific gravity in the drain separation chamber, the lubricating oil is filtered and sent back to the oil tank, and the drain floats. However, it is disclosed that when the water level rises to a certain level, the reed switch opens a normally closed electromagnetic valve communicating with the lower part of the drain separation chamber to automatically discharge the drain to the outside.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

Where a is the volume of the drain chamber 18 (c
c) and b are drains (c) remaining in the drain chamber 18.
c), P1 is the atmospheric pressure (kgf / cm ² abs), and P2 is the internal pressure of the drain chamber 18 (kgf / cm ² abs). Further, in FIG. 7, the capacity of the drain chamber 18 is 20c.
c, the amount of drain remaining in the drain chamber 18 is 4 cc,
It shows the discharge amount of the drain D per one time when the internal pressure of the drain chamber 18 is made the same as the pressure of the oil separator 3, and the internal pressure of the oil separator 3 is 15.
5 (kgf / cm ² abs) and 8 ( kg f / cm ²
abs), the difference in the discharge amount of drain D is 0.8c
It can be reduced to about c.

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction content]

[Figure 7]

Claims (8)

[Claims] 1. An automatic drain discharge device for an oil-cooled rotary compressor that separates and discharges the drain mixed in the lubricating oil of the rotary compressor body, in an oil separator connected to the discharge port of the rotary compressor body. A drain separation chamber that communicates downward, a first drain sensor provided in the drain separation chamber, a drain communication passage that communicates one end with the lower portion of the drain separation chamber and the other end communicates with the drain chamber, A discharge passage having one end connected to the drain chamber and the other end connected to the outside; a first automatic opening / closing valve provided in the drain communication passage; and a second automatic opening / closing valve provided in the discharge passage, An automatic drain discharge device for an oil-cooled rotary compressor, comprising: a controller that selectively opens the first automatic open / close valve and the second automatic open / close valve by the first drain sensor. 2. An automatic drain discharge device for an oil-cooled rotary compressor, which separates and discharges the drain mixed in the lubricating oil of the rotary compressor body, in an oil separator connected to the discharge port of the rotary compressor body. A drain separation chamber communicating downward through a drain / lubricating oil communication passage, one end of which communicates with an upper portion of the drain separation chamber, and an oil reservoir of the oil separator and an oil supply inlet of the rotary compressor body. The circulation path having the other end communicating with the inlet-side oil passage of the oil cooler provided in the middle of the supply oil passage, the first drain sensor provided in the drain separation chamber, and one end at the bottom of the drain separation chamber. Is provided in the drain communication passage, a drain communication passage that communicates the other end with the drain chamber, a discharge passage that communicates one end with the drain chamber and the other end communicates with the outside, and the drain communication passage. Control for selectively opening the first automatic opening / closing valve, the second automatic opening / closing valve provided in the discharge passage, and the first drain opening / closing valve by the first drain sensor. An automatic drain discharge device for an oil-cooled rotary compressor, comprising: 3. The oil-cooled rotary compression system according to claim 2, wherein one end of the circulation path is opened at an upper central portion of the drain chamber, and a check valve is provided in the middle of the circulation path. Machine automatic drain discharge device. 4. The drain chamber according to claim 2, wherein an inner wall of the drain chamber is formed in a substantially cylindrical shape, and the other end of the drain communication passage is opened in a tangential direction of the inner wall. Automatic drain discharge device for oil-cooled rotary compressor. 5. The volume of the drain chamber is smaller than at least the volume between the lower portion of the first drain sensor of the drain separation chamber and one end of the drain communication passage. An automatic drain discharge device for the oil-cooled rotary compressor described. 6. A second drain sensor is provided in the drain chamber, and an interlock circuit is provided in the controller so that the second automatic opening / closing valve is closed when the second drain sensor is not detected. An automatic drain discharge device for an oil-cooled rotary compressor according to claim 1 or 2, wherein an alarm means is connected to the interlock circuit. 7. The automatic drain discharge of an oil-cooled rotary compressor according to claim 1, wherein the control device is connected in parallel to a starting device of a drive motor of the rotary compressor body. apparatus. 8. The automatic drain discharge device for an oil-cooled rotary compressor according to claim 1, further comprising an electric heater for keeping heat installed near the drain chamber.