JP2013036397A - Refueling type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably discharge oil in a secondary storage while suppressing the flow of compressed air into a compressor body when recovering the oil stored in the secondary storage of an oil separator.SOLUTION: A refueling type compressor includes an oil separator 7 that includes a primary storage for storing oil subjected to primary separation, a filter 13 through which compressed gas after the primary separation passes and which causes the oil remaining in the compressed gas to be subjected to secondary separation, a secondary storage 13a for storing the oil separated by the filter, and a recovery pipe 14 for recovering the oil stored in the secondary storage on a compressor body side. The secondary storage is formed in a bottom member 22 for closing the bottom of the filter, the bottom member being provided with an opening 22b for causing the secondary storage to communicate with the primary storage and an opening/closing device 23 for opening/closing the opening. The opening/closing device operates to close the opening while the compressor is in operation, and opens the opening while the compressor is stopped so as to discharge the oil stored in the secondary storage to the primary storage.

Description

  The present invention relates to an oil supply type compressor provided with an oil separator, and is particularly suitable for an oil supply type screw compressor in which oil separated by the oil separator is injected into a compression working chamber.

  An oil supply type compressor injects oil (lubricating oil) into a compression working chamber for the purpose of lubrication, sealing, and cooling in a compression process. Since the compressed air supplied to the customer from the oil supply type compressor must not contain oil droplets, the oil supply type compressor is provided with an oil separator for separating the compressed air from the oil.

  Conventional general oil separators perform primary separation by centrifugal separation utilizing the difference in specific gravity between compressed air and oil, and drop the oil into the primary reservoir at the bottom of the oil separator by its own weight. And store. The fine particulate oil that cannot be completely separated by the centrifugal separation is trapped by the filter and secondarily separated when passing through the filter provided in the oil separator together with the compressed air. It drops and accumulates in the secondary storage part provided in the lower part of the filter.

The oil separator and the compressor main body are used to prevent a phenomenon in which the oil that has been secondarily separated in the secondary storage section flows out as oil droplets to the outside of the compressor due to the flow of compressed air (hereinafter referred to as take-away). The oil stored in the secondary storage unit is recovered to the compressor main body side (compression working chamber or suction side) through a recovery pipe.
Examples of this type of prior art include those described in Patent Document 1 and Patent Document 2.

Japanese Patent Laid-Open No. 2003-139061 JP-A-9-151852

  The amount of oil stored in the secondary storage part of the oil separator is larger when the compressor is stopped than when the compressor is operating. Therefore, in order to prevent the oil stored in the secondary storage section from being removed when the compressor is started, the oil is stored in the secondary storage section during no-load startup (for example, during star startup for star delta startup). The oil is prevented from being removed by increasing the diameter of the recovery pipe so that all the recovered oil can be recovered to the suction side of the compressor body.

  However, the amount of oil stored in the secondary storage unit differs depending on the operating condition immediately before the compressor stops, and if a large amount of oil is stored in the secondary storage unit, the diameter of the recovery pipe may be increased. It was difficult to discharge the entire amount of oil, and it was difficult to completely prevent the oil from being removed.

  In addition, when the diameter of the recovery pipe described above is increased, oil that has been stored during operation is recovered, and at the same time, a large amount of compressed air flows into the compressor body. there were.

  In the thing of the said patent document 1, a fixed quantity of oil is always collect | recovered by providing the recovery piping which connects an oil separator and a compressor main body with the member from which a passage area changes with oil temperature.

  In this patent document 1, since the passage area is changed by the temperature of the oil, more oil can be recovered if the compressor is started when the oil temperature is low. However, when restarting from a paused state for capacity control, the oil temperature is high, so the passage area of the recovery pipe provided with the member that changes the passage area remains small. . For this reason, the oil in the secondary storage part cannot be sufficiently recovered, and there is a concern that oil removal may occur.

  Moreover, in the thing of the said patent document 2, although the capillary tube is provided in collection | recovery piping (suction pipe), a capillary tube is a fixed throttle, The oil stored by the secondary storage part by making this throttle amount small. If the recovery amount from the recovery pipe is made sufficient, there is a problem similar to the case where the diameter of the recovery pipe is increased, and if the throttle amount is increased, the oil stored in the secondary storage part will be sufficient. Cannot be recovered and oil removal cannot be prevented.

  The purpose of the present invention is to prevent the compressed air from flowing into the compressor body side during the recovery of the oil stored in the secondary storage part of the oil separator and prevent the compressor performance from deteriorating, An object of the present invention is to obtain an oil supply type compressor capable of reliably discharging the oil stored in the secondary storage part of the oil separator.

  In order to achieve the above object, the present invention comprises a compressor body and an oil separator for separating oil from the compressed gas discharged from the compressor body, and the oil separator is separated from the compressed gas. A primary storage part for storing the primary separated oil, a filter for allowing the compressed gas after the primary separation to pass through and secondary separation of the oil remaining in the compressed gas, and the filter A secondary reservoir provided at the bottom of the filter to store the oil, and the oil stored in the secondary reservoir with the pressure of the secondary reservoir and the pressure on the compressor body side In the oil supply type compressor provided with a recovery pipe for recovery to the compressor main body side due to the difference, the secondary storage part is configured by a bottom member that closes a lower part of the filter, and the bottom member includes the secondary storage unit. It is formed so that the reservoir and the primary reservoir are in communication. An opening and closing device that opens and closes the opening, and the opening and closing device closes the opening during compressor operation and operates to open the opening when the compressor is stopped. The oil stored in the secondary storage unit during the operation of the compressor body is configured to be discharged to the primary storage unit when the compressor is stopped.

  ADVANTAGE OF THE INVENTION According to this invention, while recovering the oil stored in the secondary storage part of the oil separator, it can suppress that compressed air flows into a compressor main body, can prevent that a compressor performance falls, There is an effect that it is possible to obtain an oil supply compressor capable of reliably discharging oil stored in the secondary storage portion of the separator.

The system diagram explaining the whole structure of an oil supply type compressor. The longitudinal cross-sectional view which shows the common oil separator used for an oil supply type compressor. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. BRIEF DESCRIPTION OF THE DRAWINGS It is a principal part longitudinal cross-sectional view of the oil separator in Example 1 of the oil supply type compressor of this invention, and the figure which shows the state during compressor operation. The main part longitudinal cross-sectional view of the oil separator in Example 1 of the oil supply type compressor of this invention, The figure which shows the state in a compressor stop. The expanded sectional view which expands and shows the lower part of the filter shown in FIG. FIG. 7 is a main part enlarged view showing an E part of FIG. 6 in an enlarged manner, and showing a state in which the opening / closing device is closed. It is a principal part enlarged view which expands and shows the E section of FIG. 6, and is a figure which shows the state which the opening / closing apparatus is open. The principal part longitudinal cross-sectional view of the oil separator in Example 2 of the oil supply type compressor of this invention which shows the state during compressor operation. The principal part longitudinal cross-sectional view of the oil separator in Example 2 of the oil supply type compressor of this invention which shows the state in the compressor stop. The expanded sectional view which expands and shows the lower part of the filter shown in FIG. FIGS. 11A and 11B are enlarged views of a main part showing an F portion in FIG. 11, in which FIG. 11A shows a state in which the opening / closing device is closed, and FIG. The principal part longitudinal cross-sectional view of the oil separator in Example 3 of the oil supply type compressor of this invention, and the figure which shows the state during compressor operation. The principal part longitudinal cross-sectional view of the oil separator in Example 3 of the oil supply type compressor of this invention, The figure which shows the state in a compressor stop. The expanded sectional view which expands and shows the lower part of the filter shown in FIG. It is the principal part enlarged view which expands and shows the F section of FIG. 15, (a) A figure which shows the state which the switchgear is closed, (b) The figure which shows the state where the switchgear is open.

  Hereinafter, specific examples of the oil supply type compressor of the present invention will be described with reference to the drawings. Note that, in each drawing, the portions denoted by the same reference numerals indicate the same or corresponding portions.

First, the whole structure of the oil supply compressor will be described with reference to the system diagram shown in FIG.
In the figure, 1 is a compressor body composed of a screw compressor or the like, 2 is an electric motor for driving the compressor body 1, and 3 is a suction pipe for introducing air to the suction side of the compressor body 1. The suction pipe 3 is provided with a suction filter 4 and a suction throttle valve 5. Reference numeral 6 denotes a discharge pipe connected to the discharge side of the compressor body 1. The discharge pipe 6 is provided with an oil separator 7 and an after cooler 8 provided downstream of the oil separator 7.

  An oil return pipe 9 is provided in the lower part of the oil separator 7, and oil (lubricating oil) accumulated in the oil separator 7 is taken out from the oil return pipe 9 and then partially bypassed pipe 9 a. The remaining portion is guided to the oil cooler 10 through the oil return pipe 9b and cooled, and then merges with the oil flowing through the bypass pipe 9a, and then passes through the oil return pipe 9c. Injected into the compression chamber.

  Although not shown, the amount of oil flowing through the bypass pipe 9a is adjusted so that the temperature of the oil injected into the compressor body 1 becomes an appropriate temperature. For example, a temperature control valve or the like is provided at the junction of the bypass pipe 9a and the oil return pipe 9b from the oil cooler 10, and the amount of bypass oil flowing through the bypass pipe 9a according to the temperature of the oil from the oil cooler 10 is set. The temperature is adjusted so that the oil temperature falls within a predetermined temperature range that has been determined in advance, and is then injected into the compressor body 1.

Reference numeral 11 denotes a cooling fan for cooling the compressed air flowing through the after cooler 8 and the oil flowing through the oil cooler 10. The cooling fan 11 is driven by an electric motor 12.
A filter 13 is provided at the upper center in the oil separator 7, and the oil mixed in the compressed air introduced into the oil separator 7 from the discharge pipe 6 is primarily separated by centrifugation, Thereafter, the compressed air from which the oil has been separated by passing through the filter 13 and separated from the oil enters the aftercooler 8 through the discharge pipe 6a, is cooled, and is then cooled in an air tank (not shown) outside the compressor. Sent to.

  Since the oil that has been secondarily separated is stored in the bottom of the filter 13, the stored oil is injected into the compression working chamber of the compressor body 1 through the recovery pipe 14. Reference numeral 15 denotes an orifice provided in the recovery pipe 14. The orifice 15 limits the amount of oil collected at the bottom of the filter 13, and the compressed air in the oil separator 7 moves toward the compressor body. It suppresses flowing in and prevents the compressor performance from deteriorating.

  The oil in the oil separator 7 is compressed via the oil return pipe 9 and the recovery pipe 14 using the pressure difference between the pressure in the oil separator 7 and the pressure in the compression working chamber. It can flow to the working chamber side.

  2 is a longitudinal sectional view showing an example of a conventional general oil separator used in the oil supply type compressor shown in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG. Arrows A to D shown in these drawings indicate the flow of compressed air in the oil separator 7.

  The oil separator 7 includes an outer cylinder 16 for centrifuging and storing oil, and an inner cylinder 17 provided concentrically with the outer cylinder 16 at an upper portion in the outer cylinder 16. The lower part of the outer cylinder 16 serves as a primary storage part 18 in which primary separated oil is stored. A cylindrical filter 13 is concentrically provided in the inner cylinder 17. A lower end opening of the filter 13 is closed by a bottom member 22, and an upper portion of the bottom member 22 is secondarily separated by the filter 13. It becomes the secondary storage part 13a where the oil which accumulates.

  The upper portion of the oil separator 7 is closed by a first lid member 19 and a second lid member 20, the inner cylinder 17 is closed to the first lid member 19, and the filter 13 is linked to the first lid member 19. Between the said 2nd cover members 20, it attaches via the sealing material, for example, packing. A discharge passage 20a is formed at the center of the second lid member 20, and a pressure regulating check valve 21 is provided so as to cover the discharge passage 20a. An inlet 21a of the pressure regulating check valve 21 is connected to the discharge passage 20a, and an outlet 21b is connected to the discharge pipe 6a for guiding compressed air to the aftercooler 8. Further, a valve body 21c is provided between the inlet portion 21a and the outlet portion 21b. The valve body 21 has a pressure at the inlet portion 21a that is equal to or higher than a predetermined pressure and higher than the pressure at the outlet portion 21b. It is configured to open only when

  The air compressed by the compressor body 1 (see FIG. 1) is discharged from the compressor body 1 together with oil (lubricating oil), and flows into the oil separator 7 through the discharge pipe 6 as shown by the arrow A. To do. As shown by the arrow B, the mixture of compressed air and oil that has flowed into the oil separator 7 flows in the circumferential direction through the space between the outer cylinder 16 and the inner cylinder 17, so that a centrifugal force acts on the mixture. Due to the difference in specific gravity between air and oil, the oil is centrifuged toward the outer cylinder 16 and the compressed air is centrifuged toward the inner cylinder. The oil primarily separated by this centrifugal separation falls along the wall surface of the outer cylinder 16 and is stored in the primary storage section 18 below the oil separator 7. The stored oil is supplied to the compressor body via an oil return pipe 9 (see FIG. 1) due to a pressure difference between the pressure in the oil separator 7 and the pressure in the compression working chamber of the compressor body 1. Returned to 1 side. Since the oil in the oil separator 7 is at a high temperature, the circulation path is configured to be supplied to the compressor body after being cooled by the oil cooler 10 (see FIG. 1) as described above.

  On the other hand, the fine particulate oil in the compressed air that could not be separated by the centrifugal separation, together with the compressed air, wraps around the space between the inner cylinder 17 and the filter 13 as shown by the arrow C, pass. At this time, the particulate lubricating oil is captured by the filter 13 and is dropped and stored in the secondary storage portion 13a at the bottom of the filter 13. The oil stored in the secondary storage part 13a is recovered to the compressor body 1 side via the recovery pipe 14 due to the pressure difference between the pressure in the oil separator 7 and the pressure in the compression working chamber of the compressor body 1. The

  The compressed air from which the oil has been separated by passing through the filter 13 is discharged from the discharge passage 20a provided in the upper portion of the oil separator 7 through the pressure regulating check valve 21 as indicated by an arrow D. After flowing out to 6a and being cooled through an aftercooler 8 (see FIG. 1), it flows into an air tank or the like provided outside the compressor, and is supplied to the customer from here.

  In the configuration of the oil separator 7 configured as described above, when the diameter of the recovery pipe 14 is increased (or the diameter of the orifice 15 (see FIG. 1) is increased to reduce the throttle amount), the secondary storage is performed. At the same time that the oil in the part is recovered, the compressed air also flows into the compressor main body 1 side to deteriorate the compressor performance. Conversely, if the diameter of the recovery pipe 14 is reduced (or the diameter of the orifice 15 is reduced to increase the throttle amount), the oil stored in the secondary storage part 13a cannot be sufficiently recovered, and the oil Can't prevent taking away.

  Therefore, in the oil supply type compressor of this embodiment, the oil separator 7 is configured as shown in FIGS. FIG. 4 is a longitudinal sectional view of an essential part of the oil separator 7 in this embodiment, and shows a state during the operation of the compressor. FIG. 5 is also a longitudinal sectional view of an essential part of the oil separator 7 in the present embodiment. FIG. 6 is an enlarged cross-sectional view showing a lower portion of the filter shown in FIG. 4 and FIG. 7 is an enlarged view showing an E portion of FIG. 6 with the opening / closing device closed. FIG. 8 is an enlarged view of part E in FIG. 6 and is a view showing a state in which the opening / closing device is open. Note that when the compressor is in operation (or when the compressor is started), the compressor body 1 is driven by the electric motor 2 to discharge compressed gas into the oil separator 7, or the compressor is stopped (or “When the compressor is stopped” refers to a state in which the driving of the compressor body 1 is stopped and no compressed gas is discharged from the compressor body 1.

  In the oil separator 7 according to the present embodiment, the recovery pipe 14 is configured so that the compressed air in the oil separator 7 does not flow into the compressor body 1 through the recovery pipe 14 and deteriorate the compressor performance. The diameter (or the diameter of the orifice 15) is made small. Further, as shown in the enlarged view of FIG. 6, the bottom member 22 that closes the lower end opening of the filter 13 has a configuration in which the central portion is recessed so as to protrude downward, whereby the secondary storage portion 13a. The lowermost part is formed in a plane part 22a, and the plane part 22a communicates the space on the primary side (outside of the filter 13) and the space on the secondary side (inside of the filter 13). An opening 22b is formed.

  An opening / closing device 23 for opening and closing the opening 22b is provided on the bottom surface of the bottom member 22, and in this embodiment, the opening / closing device 23 is connected to the bottom member 22 as shown in FIG. And a swing-type valve body 23a that opens and closes the lower side of the opening 22 and a shaft portion 23b for rotatably attaching one end side of the valve body 23a to the bottom member 22. And a sealing material 23c provided in the valve body 23a for sealing between the valve body 23a and the bottom member 22. The valve body 23a is configured to open and close by a pressure difference between the pressure of the space on the primary side (outside of the filter 13) of the filter 13 and the pressure of the space on the secondary side (inside of the filter 13). .

  That is, during the normal operation of the oil-filled compressor, the pressure in the secondary side (inside the filter 13) space of the filter 13 causes a pressure loss when the compressed gas passes through the filter 13. It is smaller than the pressure in the side (outside of the filter 13) space. For this reason, as shown in FIG. 7, the valve body 23a is pressed against the bottom member 22 by the pressure difference and closes the opening 22b. For this reason, the oil secondarily separated by the filter 13 is stored in the secondary reservoir 13a.

  The oil stored in the secondary storage portion 13a is supplied to the pressure in the oil separator 7 and the pressure in the compression working chamber of the compressor body 1 (when the oil is returned to the suction side) via the recovery pipe 14 shown in FIG. Is recovered on the compressor body 1 side due to the pressure difference from the suction side pressure). However, in this embodiment, the diameter of the recovery pipe 14 (or so that the compressed air in the oil separator 7 flows into the compressor main body 1 in a large amount through the recovery pipe 14 and does not deteriorate the compressor performance. The diameter of the orifice 15) is made small. During compressor operation, even if the diameter of the recovery pipe 14 is reduced, the oil in the secondary reservoir 13a is recovered on the compressor body 1 side, so that no oil is collected in the secondary reservoir 13a. Or, it can be made to be slightly accumulated. However, in the conventional general oil separator shown in FIG. 2, a large amount of oil accumulates in the secondary storage part by dripping from the filter 13 while the compressor is stopped. The oil accumulated in the secondary reservoir 13a at the time of starting the compressor could not be recovered to the compressor body 1 side by the recovery pipe 14 and the oil removal could not be prevented.

  On the other hand, in this embodiment, as described above, the bottom member 22 of the filter 13 is provided with the opening 22b and the opening / closing device 23 for opening and closing the opening 22b. When the pressure difference between the primary side space 13 and the secondary side space 13 disappears, the valve body 23a of the opening / closing device 23 is reduced by its own weight or by the weight of the oil accumulated in the secondary storage part. As shown in FIG. 8, it rotates downward and the opening 22b is opened. Therefore, even if oil is dripped from the filter 13 while the compressor is stopped, the oil is not stored in the secondary reservoir 13a but falls into the primary reservoir 18 of the oil separator 7 through the opening 22b. To do. Thus, in this embodiment, since oil is not stored in the secondary storage portion 13a at the time of starting the compressor, even if the diameter of the recovery pipe 14 is configured to be small, oil removal is surely prevented. can do.

  Further, when the compressor is started, a pressure difference is generated between the primary side space and the secondary side space of the filter 13, and the valve body 23a of the opening / closing device 23 is caused by this pressure difference as shown in FIG. Since the opening 22b is immediately closed, the compressed gas passes through the filter 13 and is secondarily separated, and then discharged from the oil separator 7 to the outside.

  Since the valve body 13a is operated so as to easily close the opening 22b by the pressure difference between the primary side and the secondary side of the filter 13 after the compressor is started, the rotation angle of the valve body 23a is It is preferable to provide a stopper portion 23d or the like for limiting the rotation angle so that the oil in the secondary storage portion 13a can be kept as small as possible within a range where the oil can pass and fall.

  As described above, according to the present embodiment, the oil in the secondary storage unit can be discharged while the compressor is stopped, so that it is possible to prevent the oil from being removed when the compressor is started.

  In an oil supply type compressor, generally, a forming phenomenon of lubricating oil occurs in the oil separator 7 immediately after the compressor is stopped. When forming occurs and the filter 13 is immersed in oil, a large amount of oil is accumulated in the secondary storage portion 13a of the filter 13 while the compressor is stopped. For this reason, in the conventional general oil separator, the size from the oil surface height in the oil separator 7 to the lower end of the filter 13 is made large so that the filter 13 is immersed in oil when forming occurs. I was avoiding it. Therefore, the conventional oil separator has been increased in size.

  On the other hand, in the present embodiment, even if a large amount of oil is accumulated in the secondary reservoir 13a while the compressor is stopped, the oil can be discharged by the opening 22b and the opening / closing device 23. Become. Therefore, even if the forming phenomenon occurs and the filter 13 is submerged in oil and a large amount of oil is accumulated in the secondary reservoir 13a, the oil can be easily discharged. There is no need to do this, and the effect of reducing the size of the oil separator 7 can also be obtained.

  In this embodiment, the installation position of the opening / closing device 23 is the lower center part of the filter 13 (the center part of the bottom member 22). This is because the internal flow of the oil separator 7 is a swirling flow, so that the flow velocity becomes slower at the center, and the compressed air flows into the inside from the side surface (outer peripheral side) of the filter 13, so Therefore, the static pressure is dominant in the lower center portion of the filter 13, and the pressure acting on the valve body 23a can be stabilized by placing the opening / closing device 23 in this portion.

  Further, in this embodiment, the lower central part of the filter 13 is recessed so as to protrude downward, and the secondary storage part 13a is provided, so that oil can be easily stored in this part. Oil accumulated in can be easily discharged. Furthermore, the lowermost part of the bottom member 22 is configured as a flat portion 22a, the opening 22b is formed in the flat portion 22a, and an opening / closing device 23 for opening and closing the opening 22b is provided in the flat portion 22a. Therefore, the valve body 23a of the opening / closing device 23 can be easily brought into close contact with the flat portion 22a, and the opening 22b can be reliably opened and closed.

The opening 22b is preferably circular, and the sealing material 23c can be easily installed around the opening 22b. The opening 22b may have a shape other than a circle.
In the said Example, although demonstrated with the example of the oil supply type screw compressor which compresses air, the to-be-compressed fluid may be other gas not only air. Further, the compressor is not limited to a screw compressor, and can be similarly applied to a scroll compressor or the like.

  A second embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a longitudinal sectional view of an essential part of the oil separator in the second embodiment of the oil supply compressor of the present invention, and shows a state during the operation of the compressor, and FIG. 10 shows the second embodiment of the oil supply compressor of the present invention. FIG. 11 is a longitudinal sectional view of a main part of the oil separator in FIG. 1, showing a state when the compressor is stopped, FIG. 11 is an enlarged sectional view showing a lower portion of the filter shown in FIG. 9, and FIG. FIG. 2A is an enlarged view of a main part, and FIG. 2A is a diagram showing a state in which the switchgear is closed, and FIG. 2B is a diagram showing a state in which the switchgear is open.

  In the above-described first embodiment, the example in which the swing type valve element 23a is used as the opening / closing device 23 provided on the bottom member 22 of the filter 13 has been described. However, in this second embodiment, a pressure is used instead of the opening / closing device 23. An opening / closing device 24 configured to open and close the valve body using the difference and the elastic body is provided.

  9 to 12, the same reference numerals as those in FIGS. 1 to 8 indicate the same or corresponding parts, and the description of the same parts as those in the first embodiment is omitted.

  In this embodiment, as shown in FIG. 9, an opening / closing device 24 is provided at the center of the bottom member 22 of the filter 13, and this opening / closing device 24 is urged upward by an elastic body (spring) 24a. A valve body 24b and a housing (cylinder member) 24c for guiding the movement of the valve body 24b are provided.

  The valve body 24b is configured to be pressed against the bottom member 22 with a slight force by a spring or the like even when there is no pressure difference between the primary side space and the secondary side space of the filter 13 when the compressor is stopped. In addition, when the oil of the filter dripped while the compressor is stopped and accumulates in the secondary reservoir 13a, the valve body 24b is pushed downward by the weight of the oil, the opening 22b is opened, and the secondary reservoir is It is comprised so that the stored oil may be collect | recovered by a primary storage part.

  The configuration of the opening / closing device 24 will be described in more detail with reference to enlarged views shown in FIGS. 11 and 12 (a) show the operation of the opening / closing device 24 during the operation of the compressor. The valve body 24b of the opening / closing device 24 is formed in an I shape, and a lower valve portion 24ba and an upper piston portion 24bb are integrally formed, and a plurality of the valve portions 24ba are formed near the center of the bottom member 22. The formed opening 22c is configured to open and close from below. The piston portion 24bb is configured to slide up and down in the housing (cylinder member) 24c, and the elastic body 24a is provided between the bottom surface of the piston portion 24bb and the bottom member 22. The piston portion 24bb is urged upward. A cylinder chamber 24g is formed between the upper surface of the piston portion 24bb and the housing 24c.

  24d is a sealing material that seals between the valve body 24b and the bottom member 22, 24e is a sealing material that is provided on the outer periphery of the piston portion 24bb of the valve body 24b and seals between the housing (cylinder member), 24f Is a hole formed in the housing 24b for communicating the secondary reservoir 13a and the inside of the housing 24c, and 24h is similarly formed in the housing 24b for communicating the secondary space of the filter 13 and the cylinder chamber 24g. It is a hole.

  11 and 12A, during the operation of the compressor, the valve body 24b of the opening / closing device 24 is pushed upward by the pressure on the primary side of the elastic body 24a and the oil separator 7. The operation is performed so as to close the opening 22c. That is, the valve body 24b of the opening / closing device 24 is configured to close the opening by adding a pressure difference between the primary side space and the secondary side space of the filter 13 when the pressure difference is generated. Therefore, although the oil dripped from the filter 13 is stored in the secondary storage part 13a, this oil is collect | recovered by the side of the compressor main body 1 (refer FIG. 1) by the said collection piping 14 (refer FIG. 9).

  When the compressor is stopped, the oil of the filter 13 drops and accumulates in the secondary storage part 13a. With the weight of the oil, as shown in FIGS. 10 and 12 (b), the elastic body 24a And the valve body 24b is pushed downward. That is, when the pressure difference generated between the primary side space and the secondary side space of the filter 13 disappears, the valve body 24b of the opening / closing device 24 loses its own weight or the weight of the stored oil. Thus, the opening 22c formed in the bottom member 22 is opened. Thereby, the primary storage part 18 and the secondary storage part 13a are connected, and the oil stored in the secondary storage part 13a in the filter 13 is transferred to the primary storage part 18 through the hole 24f and the opening 22c. Can be discharged.

  Therefore, also in the present embodiment, since the oil in the secondary reservoir 13a can be discharged while the compressor is stopped, it is possible to prevent the oil from being taken away at the time of starting the compressor. The same effect as in Example 1 can be obtained.

  A third embodiment of the present invention will be described with reference to FIGS. FIG. 13 is a longitudinal sectional view of an essential part of an oil separator in Embodiment 3 of the oil supply compressor of the present invention, and shows a state during operation of the compressor, and FIG. 14 shows Embodiment 3 of the oil supply compressor of the present invention. FIG. 15 is a longitudinal sectional view of the main part of the oil separator in FIG. 1, showing a state when the compressor is stopped, FIG. 15 is an enlarged sectional view showing the lower part of the filter shown in FIG. 13, and FIG. FIG. 2A is an enlarged view of a main part, and FIG. 2A is a diagram showing a state in which the switchgear is closed, and FIG. 2B is a diagram showing a state in which the switchgear is open.

  In the above-described second embodiment, the example using the opening / closing device configured to open and close the valve body using the pressure difference and the elastic body has been described, but in this third embodiment, the valve body using the external pressure is used. Is provided with an opening / closing device 24 configured to open and close.

  13 to 16, the same reference numerals as those in FIGS. 1 to 12 indicate the same or corresponding parts, and the description of the same parts as those in the first embodiment or the second embodiment is omitted.

  In this embodiment, as shown in FIG. 13, an opening / closing device 24 is provided at the center of the bottom member 22 of the filter 13, and this opening / closing device 24 is urged upward by an elastic body (spring) 24a. A valve body 24b, a housing (cylinder member) 24c for guiding the movement of the valve body 24b, and a control pipe 25 for guiding compressed air in the discharge pipe 6a connected to an air tank into the housing 24c. And a control valve 26 provided in the control pipe 25 and a control device 27 for controlling the control valve 26. The control valve 26 is controlled by the control device 27 so as to be opened when the compressor is stopped, and guides high-pressure air of 0.7 MPa, for example, in the discharge pipe 6a into the housing 24c. As a result, as shown in FIG. 14, the valve body 24b is pressed downward to overcome the push-up force of the elastic body 24a and push down the valve body 24b. As a result, the oil stored in the secondary storage part 13a in the lower part of the filter 13 is primary in the oil separator 7 through the hole formed in the housing 24c and the opening formed in the bottom member 22. It is comprised so that it may fall to the storage part 18 (refer FIG. 2).

  The configuration of the opening / closing device 24 will be described in more detail with reference to enlarged views shown in FIGS. 15 and 16 (a) show the operation of the opening / closing device 24 during the operation of the compressor. The valve body 24b of the opening / closing device 24 is formed in an I shape as in the second embodiment, and a lower valve portion 24ba and an upper piston portion 24bb are integrally formed, and the valve portion 24ba is configured as the bottom member 22. A plurality of openings 22c formed in the vicinity of the center are opened and closed from below. The piston portion 24bb is configured to slide up and down in the housing (cylinder member) 24c, and the elastic body 24a is provided between the bottom surface of the piston portion 24bb and the bottom member 22. The piston portion 24bb is urged upward. A cylinder chamber 24g is formed between the upper surface of the piston portion 24bb and the housing 24c, and the control pipe 25 is communicated with the cylinder chamber 24g.

  24d is a sealing material that seals between the valve body 24b and the bottom member 22, 24e is a sealing material that is provided on the outer periphery of the piston portion 24bb of the valve body 24b and seals between the housing (cylinder member), 24f Is a hole formed in the housing 24b to communicate the secondary storage portion 13a and the inside of the housing 24c.

  As shown in FIGS. 15 and 16A, during the operation of the compressor, the valve body 24b of the opening / closing device 24 is pushed upward by the pressure on the primary side of the elastic body 24a and the oil separator 7. Since the operation is performed so as to close the opening 22c, the oil dripped from the filter 13 is stored in the secondary storage part 13a. The oil is stored in the compressor main body 1 (see FIG. 1)).

  When the compressor is stopped, as shown in FIG. 14, a stop signal is sent to the control device 27, and the control device 27 controls the control valve 26 to be in an open state. Immediately after the compressor is stopped, compressed air is stored in the air tank, and the inside of the discharge pipe 6a that is the secondary side of the pressure regulating check valve 21 has the same pressure as the air tank. Therefore, when the control valve 26 is opened, the high-pressure air in the discharge pipe 6a flows between the housing 24c of the opening / closing device 24 and the piston portion 24bb via the control pipe 25 as shown in FIG. It flows into the cylinder chamber 24g formed by the upper part. As a result, the elastic body 24a is compressed and the valve body 24b is pushed downward, so that the opening 22c formed in the bottom member 22 is opened, and the primary reservoir 18 and the secondary reservoir 13a are communicated. The Thereby, the oil stored in the secondary storage part 13a in the filter 13 can be discharged to the primary storage part 18 through the hole 24f and the opening 22c.

  Therefore, also in the present embodiment, since the oil stored in the secondary storage portion 13a can be discharged while the compressor is stopped, it is possible to prevent the oil from being removed when the compressor is started. The same effects as those of the first and second embodiments can be obtained.

  In addition, as conditions for stopping the oil supply type compressor, there are a case where it is temporarily stopped by the control within the operation time and a long-term stop outside the operation time, but in any case, immediately after the compressor is stopped, the air tank Since the compressed high-pressure air is stored, the high-pressure air can be used to push down the valve body 24b as shown in FIG. 16 (b). In any case, when the compressor is stopped, The oil accumulated in the secondary reservoir 13a can be discharged. Therefore, oil can be prevented from being removed when the compressor is started next time.

  On the other hand, when the compressor starts operation, an operation start signal is sent to the control device 27, and the control device 27 controls the control valve 26 to be closed. As a result, in the valve body 24b, in addition to the spring force of the elastic body 24a, the pressure in the primary reservoir 18 (primary side of the filter 13) rises, so that an upward force is generated in the valve body 24b. To do. As a result, as shown in FIG. 16 (a), the valve body 24b is pushed upward, and the valve portion 24ba of the valve body 24b closes the opening portion 22c, so that the primary through the opening portion 22c. Communication between the reservoir 18 (primary side) and the secondary reservoir 13a (secondary side) is blocked. Accordingly, the compressed air that has flowed into the oil separator 7 from the discharge pipe 6 (see FIG. 2) is primarily separated after passing through the filter 13 after the primary separation of the oil, and then the reverse pressure regulation. It is sent to an air tank or the like outside the compressor via the stop valve 21, the discharge pipe 6 a and the aftercooler 8.

  As described above, according to each embodiment of the present invention, when the compressor is stopped, the switchgear configured to discharge the oil stored in the secondary storage part in the lower part of the filter to the primary storage part side is filtered. Since the oil stored in the secondary storage part can be automatically discharged by its own weight when the compressor stops, the oil is removed when the compressor is restarted. Can be reliably prevented. Therefore, the diameter of the recovery pipe (or the diameter of the orifice) for recovering the oil accumulated in the secondary storage part during the compressor operation to the compressor body side can be reduced. In addition, it is possible to prevent the compressed air from flowing into the compressor main body side (compression working chamber or suction side) via the recovery pipe, and as a result, it is possible to prevent the compressor performance from being deteriorated. .

1: compressor body, 2: electric motor,
3: suction pipe, 4: suction filter, 5: suction throttle valve,
6, 6a: discharge pipe,
7: Oil separator
8: Aftercooler,
9, 9b, 9c: oil return pipe, 9a: bypass pipe,
10: oil cooler, 11: cooling fan, 12: electric motor,
13: Filter, 13a: Secondary storage part,
14: Recovery piping,
16: outer cylinder, 17: inner cylinder,
18: Primary storage part,
19: first lid member,
20: Second lid member, 20a: Discharge path,
21: Pressure regulating check valve, 21a: Inlet part, 21b: Outlet part,
22: bottom member, 22a: plane portion, 22b: opening,
23, 24: switchgear,
23a: Valve body, 23b: Shaft portion, 23c: Seal material, 23d: Stopper portion,
24a: elastic body (spring), 24b: valve body, 24ba: valve part, 24bb: piston part,
24c: housing (cylinder member), 24d, 24e: sealing material,
24f, 24h: hole, 24g: cylinder chamber,
25: Control piping, 26: Control valve, 27: Control device.

Claims (9)

A compressor body and an oil separator for separating oil from the compressed gas discharged from the compressor body;
The oil separator has a primary reservoir for storing the oil primarily separated from the compressed gas, and a secondary separation of the oil remaining in the compressed gas by passing the compressed gas after the primary separation. A filter, a secondary reservoir provided at the bottom of the filter for storing the oil separated by the filter, and the oil stored in the secondary reservoir with the pressure of the secondary reservoir In an oil supply type compressor provided with a recovery pipe for recovering to the compressor main body side with a pressure difference with the pressure on the compressor main body side,
The secondary storage portion is configured by a bottom member that closes a lower portion of the filter,
The bottom member includes an opening formed to communicate the secondary storage portion and the primary storage portion, and an opening and closing device that opens and closes the opening.
The opening / closing device compresses the oil stored in the secondary reservoir during operation of the compressor body by closing the opening during compressor operation and opening the opening when the compressor is stopped. An oil supply type compressor configured to be capable of being discharged to the primary storage section when the machine is stopped.   The oil supply type compressor of Claim 1 WHEREIN: The said opening / closing apparatus is provided in the lower center part of the said filter, The oil supply type compressor characterized by the above-mentioned.   The oil supply type compressor according to claim 1 or 2, wherein the secondary storage part is formed by recessing a lower center part of the filter so as to protrude downward. .   The oil supply type compressor according to any one of claims 1 to 3, wherein the bottom part of the bottom member is configured as a flat part, the opening is formed in the flat part, and the opening / closing is performed to open and close the opening. An oil supply type compressor characterized in that an apparatus is provided on the flat portion.   5. The oil supply compressor according to claim 4, wherein the opening and closing device includes a swing type valve body, and the swing type valve body is configured to open and close a lower side of the opening. 5. Type compressor.   5. The oil supply type compressor according to claim 4, wherein the opening / closing device includes a valve body configured to be biased upward so as to close the opening by an elastic body, and a housing for guiding the movement of the valve body, The valve body of the switchgear is configured to close the opening by adding a pressure difference when a pressure difference occurs between the primary space and the secondary space of the filter, and the pressure difference An oil supply type compressor configured to open the opening by the weight of the valve body or the weight of the stored oil when the valve is lost. The oil supply type compressor according to claim 4, wherein a discharge pipe is connected to the downstream side of the oil separator via a pressure regulating check valve,
The opening / closing device includes a valve body configured to be urged upward by an elastic body to close the opening, a housing for guiding the movement of the valve body, and compressed air in the discharge pipe to the housing. A control pipe for guiding the inside, a control valve provided in the control pipe, and a control device for controlling the control valve,
The control valve is controlled by the control device so as to be opened when the compressor main body is stopped, and guides high-pressure air in the discharge pipe into the housing to push down the valve body downward to open the opening. The oil supply type compressor is configured so that the oil can be discharged to the primary storage part side by opening the part and storing the oil in the secondary storage part.   8. The oil supply type compressor according to claim 7, wherein the control valve is controlled by the control device so as to be closed when the compressor body is started.   The oil supply type compressor according to claim 7 or 8, wherein the valve body of the opening and closing device is formed in an I shape by integrating a lower valve portion and an upper piston portion, and the valve portion is a center of the bottom member. A plurality of openings formed in the vicinity are configured to open and close from below, and the piston portion is configured to slide up and down in the housing, and between the bottom surface of the piston portion and the bottom member The elastic body is provided between the piston portion and the piston portion is urged upward. A cylinder chamber is formed between the upper surface of the piston portion and the housing, and the control pipe communicates with the cylinder chamber. The oil supply type compressor characterized by the above.

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