JP2009235934A - Compressor including drain discharge mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor including a drain discharge mechanism capable of avoiding defective drain discharge due to clogging of a filter installed in a drain pipe. <P>SOLUTION: This compressor 18 including the drain discharge mechanism 30 is provided with a compressor body 14, a drier (drain treatment installation) 17 provided at delivery side of the compressor body 14, a drain water discharge line 31 extending from a lower part of the drier 17, a filter 36 provided in the drain water discharge line 31, and a valve 37 provided in the drain water discharge line 31 at downstream of the filter 36. The compressor 18 is provided with a bypass line 33 branching off of the drain water discharge line 31 at a branch part 38 between the drier 17 and the filter 36 and merging with the drain water discharge line 31 at a merging part 40 between the filter 36 and the valve 37, and a relief valve 39 interposed in the bypass line 33. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a compressor having a drain discharge mechanism capable of avoiding a drain discharge failure due to clogging of a filter interposed in a drain pipe.

In Patent Document 1, as shown in FIG. 3, the air sucked into the compressor main body 14 from the suction port 13 is compressed through the suction flow path 12 having the suction filter 11, and the compressed air is discharged from the discharge port 15. A compressor 18 is disclosed that discharges to a flow path 16 and leads to a supply destination via a dryer 17. The dryer 17 has a drain discharge circuit 19, and the dryer 17 serves as a drain treatment facility that extracts moisture from the compressed air and can treat it as drain. The drain discharge circuit 19 discharges the drain from the cooler (dryer) 17 through the ball valve 20, the filter (Y strainer) 21, and the electromagnetic valve 22 in order. However, in the compressor 18 having the drain discharge circuit 19, when the filter 21 is clogged, drain discharge is not performed. As a result, the excessively accumulated drain in the compressor 18 leaks out of the drain discharge circuit 19, which may cause damage to the compressor 18 and water damage at the place where the compressor 18 is installed.
JP 2007-231740 A

  This invention makes it a subject to provide the compressor which has a drain discharge mechanism which can avoid the drain discharge defect by the clogging of the filter interposed in drain piping.

  As means for solving the problems, the compressor of the present invention includes a compressor body, a drain treatment facility provided on the discharge side of the compressor body, and a drain water discharge line extending from below the drain treatment facility. And a filter interposed in the drain water discharge line and a valve interposed in the drain water discharge line downstream of the filter, between the drain treatment facility and the filter A bypass line that branches off from the drain water discharge line at the branch portion and joins the drain water discharge line at a junction between the filter and the valve; and a relief valve interposed in the bypass line. It has a drain discharge mechanism.

  With this configuration, even when the filter provided in the drain water discharge line of the compressor is clogged, the drain can be discharged through the relief valve of the bypass line provided in the drain water discharge line.

  The compressor of the present invention includes a compressor main body, a drain treatment facility provided on the discharge side of the compressor main body, a drain water discharge line extending from below the drain treatment facility, and the drain water discharge line. In the compressor comprising an interposed filter and a valve interposed in the drain water discharge line downstream from the filter, the drain water discharge line at a branch portion between the drain treatment facility and the filter A drain discharge mechanism including a bypass line branched from the line and an automatic drainage device interposed in the bypass line.

  With this configuration, even when the filter provided in the drain water discharge line of the compressor is clogged, the drain can be discharged through the automatic drain device of the bypass line provided in the drain water discharge line.

  Specifically, it is preferable that the bypass line is disposed at a position higher than the drain water discharge line and has a downward slope. With this configuration, even when drain water is excessively stored in the drain water discharge line disposed at a position lower than the bypass line, the drain water is disposed at a position higher than the drain water discharge line after reaching the branch portion. Then, since it flows into the down-gradient bypass line branched from the branch portion, the drain water can be discharged without flowing back to the discharge flow path of the compressor and thus to the compressor main body.

  According to the compressor of the present invention, when it becomes impossible to discharge the drain due to clogging of the filter, the drain is discharged by allowing the drain to pass through the bypass line in which the relief valve is incorporated, thereby protecting the compressor. Can do.

  When using an automatic drainage device, it is necessary to use a downwardly inclined pipe from the drain outlet of the drain water discharge line to the inlet to the automatic drainage device. There are no restrictions.

  Moreover, when using a relief valve, it is necessary to set the cracking pressure. However, if an automatic drainage device is used, it is not necessary to set it.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows an oil-free compressor 18 (hereinafter simply referred to as a compressor 18) having a drain discharge mechanism 30 according to a first embodiment of the present invention. Since the compressor 18 is the same as the conventional compressor 18 from the suction filter 11 to the dryer 17, the same parts are denoted by the same reference numerals and description thereof is omitted.

  A drain water discharge line 31 is connected below the dryer 17, and the drain water discharge line 31 is led to a drainage facility.

  The drain water discharge line 31 is provided with a normal line 32 and a bypass line 33. In the normal line 32, a first ball valve 34, a second ball valve 35, a filter (Y strainer) 36 and an electromagnetic valve 37 are provided in order from the dryer 17. The bypass line 33 branches from a branch portion 38 between the first ball valve 34 and the second ball valve 35 in the normal line 32, and joins between the filter (Y strainer) 36 and the electromagnetic valve 37 via the relief valve 39. The unit 40 is connected to the normal line 32. The bypass line 33 constitutes the drain discharge mechanism 30 together with the normal line 32. Between the relief valve 39 and the merging portion 40, a transparent or translucent tube that can visually recognize the presence or absence of water flow is used.

  Next, the operation of the drain discharge mechanism 30 will be described. At normal times (when the filter 36 is not clogged), the drain passes through the filter 36 and the electromagnetic valve 37 and is discharged via a route to the outside (drainage facility). At this time, on the bypass line 33 side, since the primary side and the secondary side of the relief valve 39 have the same pressure, the relief valve 39 is not opened and no drain flows. On the other hand, when the filter 36 is clogged, a differential pressure is generated between the primary side and the secondary side of the filter 36, and consequently, the primary side and the secondary side of the relief valve 39. Therefore, the relief valve 39 is opened, and the drain flows through the bypass line 33 and is discharged. As a result, the compressor 18 can be protected.

  When using the relief valve 39, it is necessary to set the cracking pressure. Here, the cracking pressure refers to the pressure at which a certain flow rate is recognized when the valve begins to open (according to JIS 8376, the pressure when 15% of the JIS reference flow rate is reached). This pressure was determined by experiments conducted by the inventors of the present invention. When the primary side pressure was 0.3 to 0.7 MPa, it was confirmed that the cracking pressure of the relief valve 39 was 0.2 MPa and operated without problems.

  Whether or not drain is flowing in the bypass line 33 is confirmed by visually observing a transparent or translucent tube between the relief valve 39 and the junction 40. When drain is flowing into the bypass line 33, the filter 36 is promptly replaced. In addition, a flow meter that can detect the presence or absence of drainage in the tube between the relief valve 39 and the merging portion 40 is provided, and a voice or other alarm is issued based on the flow meter signal. Also good.

  When the drain discharge is stopped urgently, the first ball valve 34 on the upstream side of the branch portion 38 may be closed, and the second ball valve 35 on the downstream side of the branch portion 38 may be closed when the filter 36 is cleaned or replaced. Close and work. Further, since the bypass line 33 is a flow path necessary for protecting the compressor 18, it is desirable not to use an electrical component that causes a malfunction. Thereby, drain discharge can be more reliably realized.

  According to the compressor 18 of the present invention, when the drain cannot be discharged due to the clogging of the filter 36, the drain flows through the bypass line 33 in which the relief valve 39 is incorporated, so that the drain is discharged. Can be protected. Further, when the relief valve 39 is used, there is no positional restriction.

  Furthermore, other embodiments will be described. FIG. 2 shows the compressor 18 having the drain discharge mechanism 51 according to the second embodiment of the present invention. The drain water discharge line 52 is provided with a normal line 53 and a bypass line 54. In the normal line 53, a first ball valve 55, a second ball valve 56, a filter (Y strainer) 57, and an electromagnetic valve 58 are provided in order from the dryer 17. The bypass line 54 branches from a branch part 59 between the first ball valve 55 and the second ball valve 56 in the normal line 53 and is led to a drainage facility via an automatic drainage device 60. The automatic draining device 60 here is a so-called auto drain and is a device that has a container for storing a liquid therein, and automatically discharges the liquid to the outside when a predetermined amount of liquid is stored in the container. In addition, the piping from the branch part 59 to the automatic drainage device 60 is disposed so as to have a slight downward slope. Further, the filter 57 and the electromagnetic valve 58 are disposed at a position lower than the automatic drain device 60. The bypass line 54 constitutes a drain discharge mechanism 51.

  Next, the operation of the drain discharge mechanism 51 will be described. At normal times, the drain is passed through the normal line 53 having a relatively low height compared to the bypass line 54. Therefore, it is discharged to the outside through the electromagnetic valve 58. When the filter 57 is clogged, drainage is stored in the piping on the upstream side of the filter 57 in the normal line 53. Thereafter, when the accumulated drain reaches the height of the branching portion 59, it flows from the branching portion 59 toward the bypass line 54 having a slightly downward slope, and is discharged to the outside through the automatic drain device 60. The emergency stop and confirmation of drain discharge of the bypass line 54 and the non-use of electrical parts are the same as when the relief valve 39 is used.

  According to the compressor 18 of the present invention, there is a merit that the setting of the cracking pressure required when the relief valve 39 is used becomes unnecessary by using the automatic drainage device 60.

  Although the oil-free compressor has been described in the above embodiment, the present invention can also be applied to an oil-provided compressor. Moreover, in the above embodiment, the dryer was shown as the drain processing equipment which extracts a water | moisture content from compressed air and can process the extracted water | moisture content as a drain. The drain treatment facility in the present invention is not limited to a so-called dryer, and may be, for example, a cooler provided for cooling compressed air, a receiver tank provided for temporarily storing compressed air, or the like. Even in a cooler, a receiver tank, and the like, moisture in the compressed air needs to be condensed and treated as drainage, so the present invention is also effective for such a configuration.

The figure which shows the compressor which has a drain discharge mechanism concerning 1st Embodiment of this invention. The figure which shows the compressor which has a drain discharge mechanism concerning 2nd Embodiment of this invention. The figure which shows the compressor which has the conventional drain discharge circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Suction filter 12 Suction flow path 13 Suction port 14 Compressor body 15 Discharge port 16 Discharge flow path 17 Dryer 18 Compressor 19 Drain discharge circuit 20 Ball valve 21 Filter (Y strainer)
22 Solenoid valve 30 Drain discharge mechanism 31 Drain water discharge line 32 Normal line 33 Bypass line 34 First ball valve 35 Second ball valve 36 Filter (Y strainer)
37 Solenoid valve 38 Branching portion 39 Relief valve 40 Merge portion 51 Drain discharge mechanism 52 Drain water discharge line 53 Normal line 54 Bypass line 55 First ball valve 56 Second ball valve 57 Filter (Y strainer)
58 Solenoid valve 59 Branch 60 Automatic drainage device

Claims (3)

A compressor body, a drain treatment facility provided on a discharge side of the compressor body, a drain water discharge line extending from below the drain treatment facility, a filter interposed in the drain water discharge line, and the filter In a compressor comprising a valve interposed in the drain water discharge line further downstream,
A bypass line branched from the drain water discharge line at a branch portion between the drain treatment facility and the filter, and joined to the drain water discharge line at a junction between the filter and the valve;
A relief valve interposed in the bypass line;
A compressor having a drain discharge mechanism. A compressor body, a drain treatment facility provided on a discharge side of the compressor body, a drain water discharge line extending from below the drain treatment facility, a filter interposed in the drain water discharge line, and the filter In a compressor comprising a valve interposed in the drain water discharge line further downstream,
A bypass line branched from the drain water discharge line at a branch portion between the drain treatment facility and the filter;
An automatic drainage device interposed in the bypass line;
A compressor having a drain discharge mechanism.   The compressor having a drain discharge mechanism according to claim 2, wherein the bypass line is disposed at a position higher than the drain water discharge line and has a downward slope.

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